| Message ID | 1438105083-19738-2-git-send-email-grmoore@opensource.altera.com |
|---|---|
| State | Superseded |
| Headers | show |
On Tuesday, July 28, 2015 at 07:38:03 PM, Graham Moore wrote: DTTO here. Thanks a lot for working on the driver though -- would you like me to continue reviewing or just take over please ? > Signed-off-by: Graham Moore <grmoore@opensource.altera.com> > --- > V2: use NULL instead of modalias in spi_nor_scan call > V3: Use existing property is-decoded-cs instead of creating duplicate. > V4: Support Micron quad mode by snooping command stream for EVCR command > and subsequently configuring Cadence controller for quad mode. > V5: Clean up sparse and smatch complaints. Remove snooping of Micron > quad mode. Add comment on XIP mode bit and dummy clock cycles. Set > up SRAM partition at 1:1 during init. > V6: Remove dts patch that was included by mistake. Incorporate Vikas's > comments regarding fifo width, SRAM partition setting, and trigger > address. Trigger address was added as an unsigned int, as it is not > an IO resource per se, and does not need to be mapped. Also add > Marek Vasut's workaround for picking up OF properties on subnodes. I don't think that's the correct thing to do with the OF nodes btw ;-) [...] > +#define CQSPI_REG_IS_IDLE(base) \ > + ((readl(base + CQSPI_REG_CONFIG) >> \ > + CQSPI_REG_CONFIG_IDLE_LSB) & 0x1) This should be a function (if needed). > +#define CQSPI_GET_RD_SRAM_LEVEL(reg_base) \ > + (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \ > + CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK) DTTO. > +static unsigned int cqspi_init_timeout(unsigned long timeout_in_ms) > +{ > + return jiffies + msecs_to_jiffies(timeout_in_ms); > +} This in turn might better be wrapped into the code. > +static unsigned int cqspi_check_timeout(unsigned long timeout) > +{ > + return time_before(jiffies, timeout); > +} DTTO. [...] > +static int cqspi_indirect_read_setup(struct spi_nor *nor, > + unsigned int from_addr) > +{ > + unsigned int reg; > + unsigned int dummy_clk = 0; > + struct cqspi_st *cqspi = nor->priv; > + void __iomem *reg_base = cqspi->iobase; > + > + writel(cqspi->trigger_address, > + reg_base + CQSPI_REG_INDIRECTTRIGGER); > + writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR); > + > + reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB; > + reg |= cqspi_calc_rdreg(nor, nor->read_opcode); > + > + /* Setup dummy clock cycles */ > +#define CQSPI_SUPPORT_XIP_CHIPS What's this supposed to do ? Should this be compile-time config or should this be in DT ? > +#ifdef CQSPI_SUPPORT_XIP_CHIPS > + /* > + * Set mode bits high to ensure chip doesn't enter XIP. > + * This results in an extra 8 dummy clocks so > + * we must account for them. > + */ > + writel(0xFF, reg_base + CQSPI_REG_MODE_BIT); > + reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB); > + if (nor->read_dummy >= 8) > + dummy_clk = nor->read_dummy - 8; > + else > + dummy_clk = 0; > +#else > + dummy_clk = nor->read_dummy; > +#endif > + reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK) > + << CQSPI_REG_RD_INSTR_DUMMY_LSB; > + > + writel(reg, reg_base + CQSPI_REG_RD_INSTR); > + > + /* Set address width */ > + reg = readl(reg_base + CQSPI_REG_SIZE); > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > + reg |= (nor->addr_width - 1); > + writel(reg, reg_base + CQSPI_REG_SIZE); > + return 0; > +} [...] > +static void cqspi_switch_cs(struct cqspi_st *cqspi, unsigned int cs) > +{ > + unsigned int reg; > + struct cqspi_flash_pdata *f_pdata = &cqspi->f_pdata[cs]; > + void __iomem *iobase = cqspi->iobase; > + struct spi_nor *nor = &f_pdata->nor; > + > + cqspi_controller_disable(cqspi); > + > + /* configure page size and block size. */ > + reg = readl(iobase + CQSPI_REG_SIZE); > + reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB); > + reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB); > + reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB); > + reg |= (ilog2(nor->mtd->erasesize) << CQSPI_REG_SIZE_BLOCK_LSB); > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > + reg |= (nor->addr_width - 1); This could use some reordering -- probably clear bits first, set second. > + writel(reg, iobase + CQSPI_REG_SIZE); > + > + /* configure the chip select */ > + cqspi_chipselect(cqspi, cs, cqspi->is_decoded_cs); > + > + cqspi_controller_enable(cqspi); > +} [...] > +static int cqspi_probe(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct mtd_part_parser_data ppdata; > + struct device *dev = &pdev->dev; > + struct cqspi_st *cqspi; > + struct spi_nor *nor; > + struct mtd_info *mtd; > + struct resource *res; > + struct resource *res_ahb; > + int ret; > + int irq; > + > + cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL); > + if (!cqspi) > + return -ENOMEM; > + > + cqspi->pdev = pdev; > + platform_set_drvdata(pdev, cqspi); > + > + ret = cqspi_of_get_pdata(pdev); > + if (ret) { > + dev_err(dev, "Get platform data failed.\n"); > + return -ENODEV; > + } > + > + cqspi->clk = devm_clk_get(dev, NULL); > + if (IS_ERR(cqspi->clk)) { > + dev_err(dev, "cannot get qspi clk\n"); > + ret = PTR_ERR(cqspi->clk); > + goto probe_failed; > + } > + cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk); > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + cqspi->iobase = devm_ioremap_resource(dev, res); > + if (IS_ERR(cqspi->iobase)) { > + dev_err(dev, "devm_ioremap_resource res 0 failed\n"); > + ret = PTR_ERR(cqspi->iobase); > + goto probe_failed; > + } > + > + res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1); > + cqspi->ahb_phy_addr = res_ahb->start; > + cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb); > + if (IS_ERR(cqspi->ahb_base)) { > + dev_err(dev, "devm_ioremap_resource res 1 failed\n"); > + ret = PTR_ERR(cqspi->ahb_base); > + goto probe_failed; > + } > + > + init_completion(&cqspi->transfer_complete); > + > + irq = platform_get_irq(pdev, 0); > + if (irq < 0) { > + dev_err(dev, "platform_get_irq failed\n"); > + ret = -ENXIO; > + goto probe_failed; > + } > + ret = devm_request_irq(dev, irq, > + cqspi_irq_handler, 0, pdev->name, cqspi); > + if (ret) { > + dev_err(dev, "devm_request_irq failed\n"); > + goto probe_failed; > + } > + > + cqspi_wait_idle(cqspi); > + cqspi_controller_init(cqspi); > + cqspi->current_cs = -1; > + cqspi->sclk = 0; > + > + /* Get flash device data */ > + for_each_available_child_of_node(dev->of_node, np) { > + unsigned int cs; > + struct cqspi_flash_pdata *f_pdata; > + > + if (of_property_read_u32(np, "reg", &cs)) { > + dev_err(dev, "couldn't determine chip select\n"); > + return -ENXIO; > + } > + if (cs >= CQSPI_MAX_CHIPSELECT) { > + dev_err(dev, "chip select %d out of range\n", cs); > + return -ENXIO; > + } > + f_pdata = &cqspi->f_pdata[cs]; > + > + ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np); > + if (ret) > + goto probe_failed; > + > + nor = &f_pdata->nor; > + mtd = &f_pdata->mtd; > + > + nor->mtd = mtd; > + nor->dev = dev; > + nor->priv = cqspi; > + mtd->priv = nor; > + > + nor->read_reg = cqspi_read_reg; > + nor->write_reg = cqspi_write_reg; > + nor->read = cqspi_read; > + nor->write = cqspi_write; > + nor->erase = cqspi_erase; > + > + nor->prepare = cqspi_prep; > + > + /* > + * Here is a 'nasty hack' from Marek Vasut to pick > + * up OF properties from flash device subnode. > + */ > + nor->dev->of_node = np; WARNING: HERE IS A HACK! This is true indeed, can someone please give feedback on how to do this right ? > + ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD); > + if (ret) > + goto probe_failed; > + > + if (nor->read_dummy > CQSPI_DUMMY_CLKS_MAX) > + nor->read_dummy = CQSPI_DUMMY_CLKS_MAX; > + > + ppdata.of_node = np; > + ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); > + if (ret) > + goto probe_failed; > + } [...]
On 07/28/2015 01:07 PM, Marek Vasut wrote: > On Tuesday, July 28, 2015 at 07:38:03 PM, Graham Moore wrote: > > DTTO here. > > Thanks a lot for working on the driver though -- would you like me to continue > reviewing or just take over please ? > Aha, I see your strategy :) You must *really* want to take this over. Fine, you can have it. And thanks, I'm glad somebody actually gives a hoot. [...] Regards, Graham
On Tuesday, July 28, 2015 at 08:22:05 PM, Graham Moore wrote: > On 07/28/2015 01:07 PM, Marek Vasut wrote: > > On Tuesday, July 28, 2015 at 07:38:03 PM, Graham Moore wrote: > > > > DTTO here. > > > > Thanks a lot for working on the driver though -- would you like me to > > continue reviewing or just take over please ? > > Aha, I see your strategy :) You must *really* want to take this over. > Fine, you can have it. I don't care either way, it's just a driver on my radar which I'd like to see mainline because I use it on my board. I can keep reviewing until we bash it into sensible state :) > And thanks, I'm glad somebody actually gives a hoot. You're welcome, I do care indeed. I use UBI/UBIFS on a QSPI NOR here. Best regards, Marek Vasut
Hi Graham, On 07/28/2015 10:38 AM, Graham Moore wrote: > Signed-off-by: Graham Moore <grmoore@opensource.altera.com> > --- > V2: use NULL instead of modalias in spi_nor_scan call > V3: Use existing property is-decoded-cs instead of creating duplicate. > V4: Support Micron quad mode by snooping command stream for EVCR command > and subsequently configuring Cadence controller for quad mode. > V5: Clean up sparse and smatch complaints. Remove snooping of Micron > quad mode. Add comment on XIP mode bit and dummy clock cycles. Set > up SRAM partition at 1:1 during init. > V6: Remove dts patch that was included by mistake. Incorporate Vikas's > comments regarding fifo width, SRAM partition setting, and trigger > address. Trigger address was added as an unsigned int, as it is not > an IO resource per se, and does not need to be mapped. Also add > Marek Vasut's workaround for picking up OF properties on subnodes. I am still not able to apply this patch to master. It seems to be rebased on master for ..spi-nor/Kconfig & spi-nor/makefile. Also I still see spaces are still not replaced by tabs in this version. > --- > drivers/mtd/spi-nor/Kconfig | 6 + > drivers/mtd/spi-nor/Makefile | 1 + > drivers/mtd/spi-nor/cadence-quadspi.c | 1276 +++++++++++++++++++++++++++++++++ > 3 files changed, 1283 insertions(+) > create mode 100644 drivers/mtd/spi-nor/cadence-quadspi.c > > diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig > index 64a4f0e..9485481 100644 > --- a/drivers/mtd/spi-nor/Kconfig > +++ b/drivers/mtd/spi-nor/Kconfig > @@ -28,4 +28,10 @@ config SPI_FSL_QUADSPI > This enables support for the Quad SPI controller in master mode. > We only connect the NOR to this controller now. > > +config SPI_CADENCE_QUADSPI > + tristate "Cadence Quad SPI controller" > + depends on ARCH_SOCFPGA > + help > + This enables support for the Cadence Quad SPI controller and NOR flash. > + > endif # MTD_SPI_NOR > diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile > index 6a7ce14..372628c 100644 > --- a/drivers/mtd/spi-nor/Makefile > +++ b/drivers/mtd/spi-nor/Makefile > @@ -1,2 +1,3 @@ > obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o > +obj-$(CONFIG_SPI_CADENCE_QUADSPI) += cadence-quadspi.o > obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o > diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c > new file mode 100644 > index 0000000..076e9c9 > --- /dev/null > +++ b/drivers/mtd/spi-nor/cadence-quadspi.c > @@ -0,0 +1,1276 @@ > +/* > + * Driver for Cadence QSPI Controller > + * > + * Copyright Altera Corporation (C) 2012-2014. All rights reserved. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms and conditions of the GNU General Public License, > + * version 2, as published by the Free Software Foundation. > + * > + * This program is distributed in the hope it will be useful, but WITHOUT > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > + * more details. > + * > + * You should have received a copy of the GNU General Public License along with > + * this program. If not, see <http://www.gnu.org/licenses/>. > + */ > +#include <linux/clk.h> > +#include <linux/completion.h> > +#include <linux/delay.h> > +#include <linux/err.h> > +#include <linux/errno.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/jiffies.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/mtd/mtd.h> > +#include <linux/mtd/partitions.h> > +#include <linux/mtd/spi-nor.h> > +#include <linux/of_device.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/sched.h> > +#include <linux/spi/spi.h> > +#include <linux/timer.h> > + > +#define CQSPI_NAME "cadence-qspi" > +#define CQSPI_MAX_CHIPSELECT 16 > + > +struct cqspi_flash_pdata { > + struct mtd_info mtd; > + struct spi_nor nor; > + u32 clk_rate; > + unsigned int read_delay; > + unsigned int tshsl_ns; > + unsigned int tsd2d_ns; > + unsigned int tchsh_ns; > + unsigned int tslch_ns; > +}; > + > +struct cqspi_st { > + struct platform_device *pdev; > + > + struct clk *clk; > + unsigned int sclk; > + > + void __iomem *iobase; > + void __iomem *ahb_base; > + struct completion transfer_complete; > + unsigned int irq_mask; > + int current_cs; > + unsigned int ahb_phy_addr; > + unsigned int master_ref_clk_hz; > + u32 is_decoded_cs; > + unsigned int fifo_depth; > + unsigned int fifo_width; > + unsigned int trigger_address; > + struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT]; > +}; > + > +/* Operation timeout value */ > +#define CQSPI_TIMEOUT_MS 500 > +#define CQSPI_READ_TIMEOUT_MS 10 > +#define CQSPI_POLL_IDLE_RETRY 3 > + > +#define CQSPI_REG_SRAM_RESV_WORDS 2 > +#define CQSPI_REG_SRAM_PARTITION_WR 1 > +#define CQSPI_REG_SRAM_THRESHOLD_BYTES 50 > + > +/* Instruction type */ > +#define CQSPI_INST_TYPE_SINGLE 0 > +#define CQSPI_INST_TYPE_DUAL 1 > +#define CQSPI_INST_TYPE_QUAD 2 > + > +#define CQSPI_DUMMY_CLKS_MAX 31 > + > +#define CQSPI_STIG_DATA_LEN_MAX 8 > + > +/* Register map */ > +#define CQSPI_REG_CONFIG 0x00 > +#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0) > +#define CQSPI_REG_CONFIG_DECODE_MASK BIT(9) > +#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10 > +#define CQSPI_REG_CONFIG_DMA_MASK BIT(15) > +#define CQSPI_REG_CONFIG_BAUD_LSB 19 > +#define CQSPI_REG_CONFIG_IDLE_LSB 31 > +#define CQSPI_REG_CONFIG_CHIPSELECT_MASK 0xF > +#define CQSPI_REG_CONFIG_BAUD_MASK 0xF > + > +#define CQSPI_REG_RD_INSTR 0x04 > +#define CQSPI_REG_RD_INSTR_OPCODE_LSB 0 > +#define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB 8 > +#define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB 12 > +#define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB 16 > +#define CQSPI_REG_RD_INSTR_MODE_EN_LSB 20 > +#define CQSPI_REG_RD_INSTR_DUMMY_LSB 24 > +#define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK 0x3 > +#define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK 0x3 > +#define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK 0x3 > +#define CQSPI_REG_RD_INSTR_DUMMY_MASK 0x1F > + > +#define CQSPI_REG_WR_INSTR 0x08 > +#define CQSPI_REG_WR_INSTR_OPCODE_LSB 0 > +#define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB 12 > +#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16 > + > +#define CQSPI_REG_DELAY 0x0C > +#define CQSPI_REG_DELAY_TSLCH_LSB 0 > +#define CQSPI_REG_DELAY_TCHSH_LSB 8 > +#define CQSPI_REG_DELAY_TSD2D_LSB 16 > +#define CQSPI_REG_DELAY_TSHSL_LSB 24 > +#define CQSPI_REG_DELAY_TSLCH_MASK 0xFF > +#define CQSPI_REG_DELAY_TCHSH_MASK 0xFF > +#define CQSPI_REG_DELAY_TSD2D_MASK 0xFF > +#define CQSPI_REG_DELAY_TSHSL_MASK 0xFF > + > +#define CQSPI_REG_READCAPTURE 0x10 > +#define CQSPI_REG_READCAPTURE_BYPASS_LSB 0 > +#define CQSPI_REG_READCAPTURE_DELAY_LSB 1 > +#define CQSPI_REG_READCAPTURE_DELAY_MASK 0xF > + > +#define CQSPI_REG_SIZE 0x14 > +#define CQSPI_REG_SIZE_ADDRESS_LSB 0 > +#define CQSPI_REG_SIZE_PAGE_LSB 4 > +#define CQSPI_REG_SIZE_BLOCK_LSB 16 > +#define CQSPI_REG_SIZE_ADDRESS_MASK 0xF > +#define CQSPI_REG_SIZE_PAGE_MASK 0xFFF > +#define CQSPI_REG_SIZE_BLOCK_MASK 0x3F > + > +#define CQSPI_REG_SRAMPARTITION 0x18 > +#define CQSPI_REG_INDIRECTTRIGGER 0x1C > + > +#define CQSPI_REG_DMA 0x20 > +#define CQSPI_REG_DMA_SINGLE_LSB 0 > +#define CQSPI_REG_DMA_BURST_LSB 8 > +#define CQSPI_REG_DMA_SINGLE_MASK 0xFF > +#define CQSPI_REG_DMA_BURST_MASK 0xFF > + > +#define CQSPI_REG_REMAP 0x24 > +#define CQSPI_REG_MODE_BIT 0x28 > + > +#define CQSPI_REG_SDRAMLEVEL 0x2C > +#define CQSPI_REG_SDRAMLEVEL_RD_LSB 0 > +#define CQSPI_REG_SDRAMLEVEL_WR_LSB 16 > +#define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF > +#define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF > + > +#define CQSPI_REG_IRQSTATUS 0x40 > +#define CQSPI_REG_IRQMASK 0x44 > + > +#define CQSPI_REG_INDIRECTRD 0x60 > +#define CQSPI_REG_INDIRECTRD_START_MASK BIT(0) > +#define CQSPI_REG_INDIRECTRD_CANCEL_MASK BIT(1) > +#define CQSPI_REG_INDIRECTRD_DONE_MASK BIT(5) > + > +#define CQSPI_REG_INDIRECTRDWATERMARK 0x64 > +#define CQSPI_REG_INDIRECTRDSTARTADDR 0x68 > +#define CQSPI_REG_INDIRECTRDBYTES 0x6C > + > +#define CQSPI_REG_CMDCTRL 0x90 > +#define CQSPI_REG_CMDCTRL_EXECUTE_MASK BIT(0) > +#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK BIT(1) > +#define CQSPI_REG_CMDCTRL_WR_BYTES_LSB 12 > +#define CQSPI_REG_CMDCTRL_WR_EN_LSB 15 > +#define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB 16 > +#define CQSPI_REG_CMDCTRL_ADDR_EN_LSB 19 > +#define CQSPI_REG_CMDCTRL_RD_BYTES_LSB 20 > +#define CQSPI_REG_CMDCTRL_RD_EN_LSB 23 > +#define CQSPI_REG_CMDCTRL_OPCODE_LSB 24 > +#define CQSPI_REG_CMDCTRL_WR_BYTES_MASK 0x7 > +#define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK 0x3 > +#define CQSPI_REG_CMDCTRL_RD_BYTES_MASK 0x7 > + > +#define CQSPI_REG_INDIRECTWR 0x70 > +#define CQSPI_REG_INDIRECTWR_START_MASK BIT(0) > +#define CQSPI_REG_INDIRECTWR_CANCEL_MASK BIT(1) > +#define CQSPI_REG_INDIRECTWR_DONE_MASK BIT(5) > + > +#define CQSPI_REG_INDIRECTWRWATERMARK 0x74 > +#define CQSPI_REG_INDIRECTWRSTARTADDR 0x78 > +#define CQSPI_REG_INDIRECTWRBYTES 0x7C > + > +#define CQSPI_REG_CMDADDRESS 0x94 > +#define CQSPI_REG_CMDREADDATALOWER 0xA0 > +#define CQSPI_REG_CMDREADDATAUPPER 0xA4 > +#define CQSPI_REG_CMDWRITEDATALOWER 0xA8 > +#define CQSPI_REG_CMDWRITEDATAUPPER 0xAC > + > +/* Interrupt status bits */ > +#define CQSPI_REG_IRQ_MODE_ERR BIT(0) > +#define CQSPI_REG_IRQ_UNDERFLOW BIT(1) > +#define CQSPI_REG_IRQ_IND_COMP BIT(2) > +#define CQSPI_REG_IRQ_IND_RD_REJECT BIT(3) > +#define CQSPI_REG_IRQ_WR_PROTECTED_ERR BIT(4) > +#define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR BIT(5) > +#define CQSPI_REG_IRQ_WATERMARK BIT(6) > +#define CQSPI_REG_IRQ_IND_RD_OVERFLOW BIT(12) > + > +#define CQSPI_IRQ_STATUS_ERR (CQSPI_REG_IRQ_MODE_ERR | \ > + CQSPI_REG_IRQ_IND_RD_REJECT | \ > + CQSPI_REG_IRQ_WR_PROTECTED_ERR | \ > + CQSPI_REG_IRQ_ILLEGAL_AHB_ERR) > + > +#define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_WATERMARK | \ > + CQSPI_REG_IRQ_IND_RD_OVERFLOW | \ > + CQSPI_REG_IRQ_IND_COMP) > + > +#define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_IND_COMP | \ > + CQSPI_REG_IRQ_WATERMARK | \ > + CQSPI_REG_IRQ_UNDERFLOW) > + > +#define CQSPI_IRQ_STATUS_MASK 0x1FFFF > + > +#define CQSPI_REG_IS_IDLE(base) \ > + ((readl(base + CQSPI_REG_CONFIG) >> \ > + CQSPI_REG_CONFIG_IDLE_LSB) & 0x1) > + > +#define CQSPI_GET_RD_SRAM_LEVEL(reg_base) \ > + (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \ > + CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK) > + > +static unsigned int cqspi_init_timeout(unsigned long timeout_in_ms) > +{ > + return jiffies + msecs_to_jiffies(timeout_in_ms); > +} > + > +static unsigned int cqspi_check_timeout(unsigned long timeout) > +{ > + return time_before(jiffies, timeout); > +} > + > +static void cqspi_fifo_read(void *dest, const void __iomem *src_ahb_addr, > + unsigned int bytes) > +{ > + unsigned int temp; > + int remaining = bytes; > + unsigned int *dest_ptr = (unsigned int *)dest; > + > + while (remaining >= sizeof(dest_ptr)) { > + *dest_ptr = readl(src_ahb_addr); > + remaining -= sizeof(src_ahb_addr); > + dest_ptr++; > + } > + if (remaining) { > + /* dangling bytes */ > + temp = readl(src_ahb_addr); > + memcpy(dest_ptr, &temp, remaining); > + } > +} > + > +static void cqspi_fifo_write(struct cqspi_st *cqspi, > + const void *src, unsigned int bytes) > +{ > + unsigned int temp = 0; > + int i; > + int remaining = bytes; > + unsigned int __iomem *dest_ptr = > + (unsigned int __iomem *)cqspi->ahb_base; > + const unsigned int *src_ptr = (const unsigned int *)src; > + > + while (remaining >= cqspi->fifo_width) { > + for (i = cqspi->fifo_width / sizeof(src_ptr) - 1; i >= 0; i--) > + writel(*(src_ptr + i), dest_ptr + i); > + src_ptr += cqspi->fifo_width / sizeof(src_ptr); > + remaining -= cqspi->fifo_width; > + } > + if (remaining) { > + /* dangling bytes */ > + i = remaining / sizeof(dest_ptr); > + memcpy(&temp, src_ptr + i, remaining % sizeof(dest_ptr)); > + writel(temp, dest_ptr + i); > + for (--i; i >= 0; i--) > + writel(*(src_ptr + i), dest_ptr + i); > + } > +} > + > +static irqreturn_t cqspi_irq_handler(int this_irq, void *dev) > +{ > + struct cqspi_st *cqspi = dev; > + unsigned int irq_status; > + > + /* Read interrupt status */ > + irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS); > + > + /* Clear interrupt */ > + writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS); > + > + if (irq_status & cqspi->irq_mask) > + complete(&cqspi->transfer_complete); > + > + return IRQ_HANDLED; > +} > + > +static int cqspi_find_chipselect(struct spi_nor *nor) > +{ > + int cs = -1; > + struct cqspi_st *cqspi = nor->priv; > + > + for (cs = 0; cs < CQSPI_MAX_CHIPSELECT; cs++) > + if (nor == &cqspi->f_pdata[cs].nor) > + break; > + return cs; > +} > + > +static unsigned int cqspi_calc_rdreg(struct spi_nor *nor, u8 opcode) > +{ > + unsigned int rdreg = 0; > + struct cqspi_st *cqspi = nor->priv; > + struct cqspi_flash_pdata *f_pdata; > + > + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; > + > + if (nor->flash_read == SPI_NOR_QUAD) > + rdreg |= (CQSPI_INST_TYPE_QUAD > + << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB); > + return rdreg; > +} > + > +static unsigned int cqspi_wait_idle(struct cqspi_st *cqspi) > +{ > + void __iomem *reg_base = cqspi->iobase; > + unsigned int count = 0; > + unsigned timeout; > + > + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); > + while (cqspi_check_timeout(timeout)) { > + if (CQSPI_REG_IS_IDLE(reg_base)) { > + /* > + * Read few times in succession to ensure it does > + * not transition low again > + */ > + count++; > + if (count >= CQSPI_POLL_IDLE_RETRY) > + return 1; > + } else { > + count = 0; > + } > + cpu_relax(); > + } > + > + /* Timeout, in busy mode. */ > + dev_err(&cqspi->pdev->dev, "QSPI is still busy after %dms timeout.\n", > + CQSPI_TIMEOUT_MS); > + return 0; > +} > + > +static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg) > +{ > + void __iomem *reg_base = cqspi->iobase; > + unsigned int timeout; > + > + /* Write the CMDCTRL without start execution. */ > + writel(reg, reg_base + CQSPI_REG_CMDCTRL); > + /* Start execute */ > + reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK; > + writel(reg, reg_base + CQSPI_REG_CMDCTRL); > + > + /* Polling for completion. */ > + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); > + while (cqspi_check_timeout(timeout)) { > + reg = readl(reg_base + CQSPI_REG_CMDCTRL) & > + CQSPI_REG_CMDCTRL_INPROGRESS_MASK; > + if (!reg) > + break; > + } > + > + if (reg != 0) { > + dev_err(&cqspi->pdev->dev, "flash cmd execute time out\n"); > + return -EIO; > + } > + > + /* Polling QSPI idle status. */ > + if (!cqspi_wait_idle(cqspi)) > + return -EIO; > + > + return 0; > +} > + > +static int cqspi_command_read(struct spi_nor *nor, > + const u8 *txbuf, unsigned n_tx, > + u8 *rxbuf, unsigned n_rx) > +{ > + unsigned int reg; > + unsigned int read_len; > + int status; > + struct cqspi_st *cqspi = nor->priv; > + void __iomem *reg_base = cqspi->iobase; > + unsigned int rdreg; > + > + if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) { > + dev_err(nor->dev, > + "Invalid input argument, len %d rxbuf 0x%08x\n", n_rx, > + (unsigned int)rxbuf); > + return -EINVAL; > + } > + > + reg = txbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB; > + > + rdreg = cqspi_calc_rdreg(nor, txbuf[0]); > + writel(rdreg, reg_base + CQSPI_REG_RD_INSTR); > + > + reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB); > + > + /* 0 means 1 byte. */ > + reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK) > + << CQSPI_REG_CMDCTRL_RD_BYTES_LSB); > + status = cqspi_exec_flash_cmd(cqspi, reg); > + if (status != 0) > + return status; > + > + reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER); > + > + /* Put the read value into rx_buf */ > + read_len = (n_rx > 4) ? 4 : n_rx; > + memcpy(rxbuf, ®, read_len); > + rxbuf += read_len; > + > + if (n_rx > 4) { > + reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER); > + > + read_len = n_rx - read_len; > + memcpy(rxbuf, ®, read_len); > + } > + > + return 0; > +} > + > +static int cqspi_command_write(struct spi_nor *nor, > + u8 opcode, const u8 *txbuf, unsigned n_tx) > +{ > + unsigned int reg; > + unsigned int data; > + int ret; > + struct cqspi_st *cqspi = nor->priv; > + void __iomem *reg_base = cqspi->iobase; > + > + if (n_tx > 4 || (n_tx && !txbuf)) { > + dev_err(nor->dev, > + "Invalid input argument, cmdlen %d txbuf 0x%08x\n", > + n_tx, (unsigned int)txbuf); > + return -EINVAL; > + } > + > + reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; > + if (n_tx) { > + reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB); > + reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK) > + << CQSPI_REG_CMDCTRL_WR_BYTES_LSB; > + data = 0; > + memcpy(&data, txbuf, n_tx); > + writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER); > + } > + > + ret = cqspi_exec_flash_cmd(cqspi, reg); > + return ret; > +} > + > +static int cqspi_command_write_addr(struct spi_nor *nor, > + u8 opcode, unsigned int addr) > +{ > + unsigned int reg; > + struct cqspi_st *cqspi = nor->priv; > + void __iomem *reg_base = cqspi->iobase; > + > + reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; > + reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB); > + reg |= ((nor->addr_width - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK) > + << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB; > + > + writel(addr, reg_base + CQSPI_REG_CMDADDRESS); > + > + return cqspi_exec_flash_cmd(cqspi, reg); > +} > + > +static int cqspi_indirect_read_setup(struct spi_nor *nor, > + unsigned int from_addr) > +{ > + unsigned int reg; > + unsigned int dummy_clk = 0; > + struct cqspi_st *cqspi = nor->priv; > + void __iomem *reg_base = cqspi->iobase; > + > + writel(cqspi->trigger_address, > + reg_base + CQSPI_REG_INDIRECTTRIGGER); move indirect trigger configuration in init, no need to do it for every read & write. > + writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR); > + > + reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB; > + reg |= cqspi_calc_rdreg(nor, nor->read_opcode); > + > + /* Setup dummy clock cycles */ > +#define CQSPI_SUPPORT_XIP_CHIPS > +#ifdef CQSPI_SUPPORT_XIP_CHIPS > + /* > + * Set mode bits high to ensure chip doesn't enter XIP. > + * This results in an extra 8 dummy clocks so > + * we must account for them. > + */ > + writel(0xFF, reg_base + CQSPI_REG_MODE_BIT); > + reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB); > + if (nor->read_dummy >= 8) > + dummy_clk = nor->read_dummy - 8; > + else > + dummy_clk = 0; > +#else > + dummy_clk = nor->read_dummy; > +#endif > + reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK) > + << CQSPI_REG_RD_INSTR_DUMMY_LSB; > + > + writel(reg, reg_base + CQSPI_REG_RD_INSTR); > + > + /* Set address width */ > + reg = readl(reg_base + CQSPI_REG_SIZE); > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > + reg |= (nor->addr_width - 1); > + writel(reg, reg_base + CQSPI_REG_SIZE); > + return 0; > +} > + > +static int cqspi_indirect_read_execute(struct spi_nor *nor, > + u8 *rxbuf, unsigned n_rx) > +{ > + int ret = 0; > + unsigned int reg = 0; > + unsigned int bytes_to_read = 0; > + unsigned int timeout; > + unsigned int watermark; > + struct cqspi_st *cqspi = nor->priv; > + void __iomem *reg_base = cqspi->iobase; > + void __iomem *ahb_base = cqspi->ahb_base; > + int remaining = (int)n_rx; > + > + watermark = cqspi->fifo_depth * cqspi->fifo_width / 2; > + writel(watermark, reg_base + CQSPI_REG_INDIRECTRDWATERMARK); I think watermark configuration can be moved to init also & there should not be any need to configuration it for every read. > + writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES); > + > + /* Clear all interrupts. */ > + writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); > + > + cqspi->irq_mask = CQSPI_IRQ_MASK_RD; > + writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK); > + > + reinit_completion(&cqspi->transfer_complete); > + writel(CQSPI_REG_INDIRECTRD_START_MASK, > + reg_base + CQSPI_REG_INDIRECTRD); > + > + while (remaining > 0) { > + ret = wait_for_completion_timeout(&cqspi->transfer_complete, > + msecs_to_jiffies > + (CQSPI_READ_TIMEOUT_MS)); > + > + bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base); There should not be any need to read SRAM level, we should be able to get rid of it like in u-boot. > + > + if (!ret && bytes_to_read == 0) { > + dev_err(nor->dev, "Indirect read timeout, no bytes\n"); > + ret = -ETIMEDOUT; > + goto failrd; > + } > + > + while (bytes_to_read != 0) { > + bytes_to_read *= cqspi->fifo_width; > + bytes_to_read = bytes_to_read > remaining > + ? remaining : bytes_to_read; > + cqspi_fifo_read(rxbuf, ahb_base, bytes_to_read); > + rxbuf += bytes_to_read; > + remaining -= bytes_to_read; > + bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base); > + } > + } > + > + /* Check indirect done status */ > + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); > + while (cqspi_check_timeout(timeout)) { > + reg = readl(reg_base + CQSPI_REG_INDIRECTRD); > + if (reg & CQSPI_REG_INDIRECTRD_DONE_MASK) > + break; > + } > + > + if (!(reg & CQSPI_REG_INDIRECTRD_DONE_MASK)) { > + dev_err(nor->dev, > + "Indirect read completion error 0x%08x\n", reg); > + ret = -ETIMEDOUT; > + goto failrd; > + } > + > + /* Disable interrupt */ > + writel(0, reg_base + CQSPI_REG_IRQMASK); > + > + /* Clear indirect completion status */ > + writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + CQSPI_REG_INDIRECTRD); > + > + return 0; > + > + failrd: > + /* Disable interrupt */ > + writel(0, reg_base + CQSPI_REG_IRQMASK); > + > + /* Cancel the indirect read */ > + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, > + reg_base + CQSPI_REG_INDIRECTRD); > + return ret; > +} > + > +static int cqspi_indirect_write_setup(struct spi_nor *nor, unsigned int to_addr) > +{ > + unsigned int reg; > + struct cqspi_st *cqspi = nor->priv; > + void __iomem *reg_base = cqspi->iobase; > + > + /* Set opcode. */ > + reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB; > + writel(reg, reg_base + CQSPI_REG_WR_INSTR); > + reg = cqspi_calc_rdreg(nor, nor->program_opcode); > + writel(reg, reg_base + CQSPI_REG_RD_INSTR); > + > + writel(cqspi->trigger_address, > + reg_base + CQSPI_REG_INDIRECTTRIGGER); > + writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR); move it to init also. > + > + reg = readl(reg_base + CQSPI_REG_SIZE); > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > + reg |= (nor->addr_width - 1); > + writel(reg, reg_base + CQSPI_REG_SIZE); > + return 0; > +} > + > +static int cqspi_indirect_write_execute(struct spi_nor *nor, > + const u8 *txbuf, unsigned n_tx) > +{ > + int ret; > + unsigned int timeout; > + unsigned int reg = 0; > + struct cqspi_st *cqspi = nor->priv; > + void __iomem *reg_base = cqspi->iobase; > + int remaining = (int)n_tx; > + struct cqspi_flash_pdata *f_pdata; > + unsigned int page_size; > + unsigned int write_bytes; > + > + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; > + page_size = nor->page_size; > + > + writel(CQSPI_REG_SRAM_THRESHOLD_BYTES, reg_base + > + CQSPI_REG_INDIRECTWRWATERMARK); should be able to move it to init Rgds, Vikas > + writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES); > + > + /* Clear all interrupts. */ > + writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); > + > + cqspi->irq_mask = CQSPI_IRQ_MASK_WR; > + writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK); > + > + reinit_completion(&cqspi->transfer_complete); > + writel(CQSPI_REG_INDIRECTWR_START_MASK, > + reg_base + CQSPI_REG_INDIRECTWR); > + > + /* Write a page or remaining bytes. */ > + write_bytes = remaining > page_size ? page_size : remaining; > + /* Fill up the data at the beginning */ > + cqspi_fifo_write(cqspi, txbuf, write_bytes); > + txbuf += write_bytes; > + remaining -= write_bytes; > + > + while (remaining > 0) { > + ret = wait_for_completion_timeout(&cqspi->transfer_complete, > + msecs_to_jiffies > + (CQSPI_TIMEOUT_MS)); > + if (!ret) { > + dev_err(nor->dev, "Indirect write timeout\n"); > + ret = -ETIMEDOUT; > + goto failwr; > + } > + > + write_bytes = remaining > page_size ? page_size : remaining; > + cqspi_fifo_write(cqspi, txbuf, write_bytes); > + txbuf += write_bytes; > + remaining -= write_bytes; > + } > + > + ret = wait_for_completion_timeout(&cqspi->transfer_complete, > + msecs_to_jiffies(CQSPI_TIMEOUT_MS)); > + if (!ret) { > + dev_err(nor->dev, "Indirect write timeout\n"); > + ret = -ETIMEDOUT; > + goto failwr; > + } > + > + /* Check indirect done status */ > + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); > + while (cqspi_check_timeout(timeout)) { > + reg = readl(reg_base + CQSPI_REG_INDIRECTWR); > + if (reg & CQSPI_REG_INDIRECTWR_DONE_MASK) > + break; > + } > + > + if (!(reg & CQSPI_REG_INDIRECTWR_DONE_MASK)) { > + dev_err(nor->dev, > + "Indirect write completion error 0x%08x\n", reg); > + ret = -ETIMEDOUT; > + goto failwr; > + } > + > + /* Disable interrupt. */ > + writel(0, reg_base + CQSPI_REG_IRQMASK); > + > + /* Clear indirect completion status */ > + writel(CQSPI_REG_INDIRECTWR_DONE_MASK, reg_base + CQSPI_REG_INDIRECTWR); > + > + cqspi_wait_idle(cqspi); > + > + return 0; > + > + failwr: > + /* Disable interrupt. */ > + writel(0, reg_base + CQSPI_REG_IRQMASK); > + > + /* Cancel the indirect write */ > + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, > + reg_base + CQSPI_REG_INDIRECTWR); > + return ret; > +} > + > +static void cqspi_write(struct spi_nor *nor, loff_t to, > + size_t len, size_t *retlen, const u_char *buf) > +{ > + int ret; > + > + ret = cqspi_indirect_write_setup(nor, to); > + if (ret == 0) { > + ret = cqspi_indirect_write_execute(nor, buf, len); > + if (ret == 0) > + *retlen += len; > + } > +} > + > +static int cqspi_read(struct spi_nor *nor, loff_t from, > + size_t len, size_t *retlen, u_char *buf) > +{ > + int ret; > + > + ret = cqspi_indirect_read_setup(nor, from); > + if (ret == 0) { > + ret = cqspi_indirect_read_execute(nor, buf, len); > + if (ret == 0) > + *retlen += len; > + } > + return ret; > +} > + > +static int cqspi_erase(struct spi_nor *nor, loff_t offs) > +{ > + int ret; > + > + /* Send write enable, then erase commands. */ > + ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0); > + if (ret) > + return ret; > + > + /* Set up command buffer. */ > + ret = cqspi_command_write_addr(nor, nor->erase_opcode, offs); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static unsigned int calculate_ticks_for_ns(unsigned int ref_clk_hz, > + unsigned int ns_val) > +{ > + unsigned int ticks; > + > + ticks = ref_clk_hz; > + ticks /= 1000; > + ticks *= ns_val; > + ticks += 999999; > + ticks /= 1000000; > + return ticks; > +} > + > +static void cqspi_delay(struct cqspi_st *cqspi, > + unsigned int ref_clk_hz, unsigned int sclk_hz) > +{ > + void __iomem *iobase = cqspi->iobase; > + struct cqspi_flash_pdata *f_pdata; > + unsigned int tshsl, tchsh, tslch, tsd2d; > + unsigned int reg; > + unsigned int tsclk; > + > + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; > + > + /* calculate the number of ref ticks for one sclk tick */ > + tsclk = (ref_clk_hz + sclk_hz - 1) / sclk_hz; > + > + tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns); > + /* this particular value must be at least one sclk */ > + if (tshsl < tsclk) > + tshsl = tsclk; > + > + tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns); > + tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns); > + tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_ns); > + > + reg = ((tshsl & CQSPI_REG_DELAY_TSHSL_MASK) > + << CQSPI_REG_DELAY_TSHSL_LSB); > + reg |= ((tchsh & CQSPI_REG_DELAY_TCHSH_MASK) > + << CQSPI_REG_DELAY_TCHSH_LSB); > + reg |= ((tslch & CQSPI_REG_DELAY_TSLCH_MASK) > + << CQSPI_REG_DELAY_TSLCH_LSB); > + reg |= ((tsd2d & CQSPI_REG_DELAY_TSD2D_MASK) > + << CQSPI_REG_DELAY_TSD2D_LSB); > + writel(reg, iobase + CQSPI_REG_DELAY); > +} > + > +static void cqspi_config_baudrate_div(struct cqspi_st *cqspi, > + unsigned int ref_clk_hz, > + unsigned int sclk_hz) > +{ > + void __iomem *reg_base = cqspi->iobase; > + unsigned int reg; > + unsigned int div; > + > + reg = readl(reg_base + CQSPI_REG_CONFIG); > + reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB); > + > + div = ref_clk_hz / sclk_hz; > + > + /* Recalculate the baudrate divisor based on QSPI specification. */ > + if (div > 32) > + div = 32; > + > + /* Check if even number. */ > + if (div & 1) > + div = (div / 2); > + else > + div = (div / 2) - 1; > + > + div = (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB; > + reg |= div; > + writel(reg, reg_base + CQSPI_REG_CONFIG); > +} > + > +static void cqspi_readdata_capture(struct cqspi_st *cqspi, > + unsigned int bypass, unsigned int delay) > +{ > + void __iomem *reg_base = cqspi->iobase; > + unsigned int reg; > + > + reg = readl(reg_base + CQSPI_REG_READCAPTURE); > + > + if (bypass) > + reg |= (1 << CQSPI_REG_READCAPTURE_BYPASS_LSB); > + else > + reg &= ~(1 << CQSPI_REG_READCAPTURE_BYPASS_LSB); > + > + reg &= ~(CQSPI_REG_READCAPTURE_DELAY_MASK > + << CQSPI_REG_READCAPTURE_DELAY_LSB); > + > + reg |= ((delay & CQSPI_REG_READCAPTURE_DELAY_MASK) > + << CQSPI_REG_READCAPTURE_DELAY_LSB); > + > + writel(reg, reg_base + CQSPI_REG_READCAPTURE); > +} > + > +static void cqspi_chipselect(struct cqspi_st *cqspi, > + unsigned int chip_select, > + unsigned int decoder_enable) > +{ > + void __iomem *reg_base = cqspi->iobase; > + unsigned int reg; > + > + reg = readl(reg_base + CQSPI_REG_CONFIG); > + if (decoder_enable) { > + reg |= CQSPI_REG_CONFIG_DECODE_MASK; > + } else { > + reg &= ~CQSPI_REG_CONFIG_DECODE_MASK; > + > + /* Convert CS if without decoder. > + * CS0 to 4b'1110 > + * CS1 to 4b'1101 > + * CS2 to 4b'1011 > + * CS3 to 4b'0111 > + */ > + chip_select = 0xF & ~(1 << chip_select); > + } > + > + reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK > + << CQSPI_REG_CONFIG_CHIPSELECT_LSB); > + reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK) > + << CQSPI_REG_CONFIG_CHIPSELECT_LSB; > + writel(reg, reg_base + CQSPI_REG_CONFIG); > +} > + > +static void cqspi_controller_enable(struct cqspi_st *cqspi) > +{ > + void __iomem *reg_base = cqspi->iobase; > + unsigned int reg; > + > + reg = readl(reg_base + CQSPI_REG_CONFIG); > + reg |= CQSPI_REG_CONFIG_ENABLE_MASK; > + writel(reg, reg_base + CQSPI_REG_CONFIG); > +} > + > +static void cqspi_controller_disable(struct cqspi_st *cqspi) > +{ > + void __iomem *reg_base = cqspi->iobase; > + unsigned int reg; > + > + reg = readl(reg_base + CQSPI_REG_CONFIG); > + reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK; > + writel(reg, reg_base + CQSPI_REG_CONFIG); > +} > + > +static void cqspi_switch_cs(struct cqspi_st *cqspi, unsigned int cs) > +{ > + unsigned int reg; > + struct cqspi_flash_pdata *f_pdata = &cqspi->f_pdata[cs]; > + void __iomem *iobase = cqspi->iobase; > + struct spi_nor *nor = &f_pdata->nor; > + > + cqspi_controller_disable(cqspi); > + > + /* configure page size and block size. */ > + reg = readl(iobase + CQSPI_REG_SIZE); > + reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB); > + reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB); > + reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB); > + reg |= (ilog2(nor->mtd->erasesize) << CQSPI_REG_SIZE_BLOCK_LSB); > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > + reg |= (nor->addr_width - 1); > + writel(reg, iobase + CQSPI_REG_SIZE); > + > + /* configure the chip select */ > + cqspi_chipselect(cqspi, cs, cqspi->is_decoded_cs); > + > + cqspi_controller_enable(cqspi); > +} > + > +static int cqspi_prep(struct spi_nor *nor, enum spi_nor_ops ops) > +{ > + struct cqspi_st *cqspi = nor->priv; > + int cs = cqspi_find_chipselect(nor); > + struct cqspi_flash_pdata *f_pdata; > + unsigned int sclk; > + > + /* Switch chip select. */ > + if (cqspi->current_cs != cs) { > + cqspi->current_cs = cs; > + cqspi_switch_cs(cqspi, cs); > + } > + > + /* Setup baudrate divisor and delays */ > + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; > + sclk = f_pdata->clk_rate; > + if (cqspi->sclk != sclk) { > + cqspi->sclk = sclk; > + cqspi_controller_disable(cqspi); > + cqspi_config_baudrate_div(cqspi, > + cqspi->master_ref_clk_hz, sclk); > + cqspi_delay(cqspi, cqspi->master_ref_clk_hz, sclk); > + cqspi_readdata_capture(cqspi, 1, f_pdata->read_delay); > + cqspi_controller_enable(cqspi); > + } > + return 0; > +} > + > +static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) > +{ > + int ret; > + > + cqspi_prep(nor, SPI_NOR_OPS_READ); > + > + ret = cqspi_command_read(nor, &opcode, 1, buf, len); > + return ret; > +} > + > +static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len, > + int write_enable) > +{ > + int ret = 0; > + > + cqspi_prep(nor, SPI_NOR_OPS_WRITE); > + > + ret = cqspi_command_write(nor, opcode, buf, len); > + return ret; > +} > + > +static int cqspi_of_get_flash_pdata(struct platform_device *pdev, > + struct cqspi_flash_pdata *f_pdata, > + struct device_node *np) > +{ > + if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) { > + dev_err(&pdev->dev, "couldn't determine read-delay\n"); > + return -ENXIO; > + } > + > + if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) { > + dev_err(&pdev->dev, "couldn't determine tshsl-ns\n"); > + return -ENXIO; > + } > + > + if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) { > + dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n"); > + return -ENXIO; > + } > + > + if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) { > + dev_err(&pdev->dev, "couldn't determine tchsh-ns\n"); > + return -ENXIO; > + } > + > + if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) { > + dev_err(&pdev->dev, "couldn't determine tslch-ns\n"); > + return -ENXIO; > + } > + > + if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) { > + dev_err(&pdev->dev, "couldn't determine spi-max-frequency\n"); > + return -ENXIO; > + } > + > + return 0; > +} > + > +static int cqspi_of_get_pdata(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct cqspi_st *cqspi = platform_get_drvdata(pdev); > + > + if (of_property_read_u32(np, "is-decoded-cs", &cqspi->is_decoded_cs)) > + cqspi->is_decoded_cs = 0; > + > + if (of_property_read_u32(np, "fifo-depth", &cqspi->fifo_depth)) { > + dev_err(&pdev->dev, "couldn't determine fifo-depth\n"); > + return -ENXIO; > + } > + > + if (of_property_read_u32(np, "fifo-width", &cqspi->fifo_width)) { > + dev_err(&pdev->dev, "couldn't determine fifo-width\n"); > + return -ENXIO; > + } > + > + if (of_property_read_u32(np, "trigger-address", > + &cqspi->trigger_address)) { > + dev_err(&pdev->dev, "couldn't determine trigger-address\n"); > + return -ENXIO; > + } > + > + return 0; > +} > + > +static void cqspi_controller_init(struct cqspi_st *cqspi) > +{ > + cqspi_controller_disable(cqspi); > + > + /* Configure the remap address register, no remap */ > + writel(0, cqspi->iobase + CQSPI_REG_REMAP); > + > + /* Disable all interrupts. */ > + writel(0, cqspi->iobase + CQSPI_REG_IRQMASK); > + > + /* Configure the SRAM split to 1:1 . */ > + writel(cqspi->fifo_depth / 2, cqspi->iobase + CQSPI_REG_SRAMPARTITION); > + > + cqspi_controller_enable(cqspi); > +} > + > +static int cqspi_remove(struct platform_device *pdev) > +{ > + struct cqspi_st *cqspi = platform_get_drvdata(pdev); > + int i; > + > + cqspi_controller_disable(cqspi); > + > + for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++) > + if (cqspi->f_pdata[i].mtd.name) > + mtd_device_unregister(&cqspi->f_pdata[i].mtd); > + > + return 0; > +} > + > +static int cqspi_probe(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct mtd_part_parser_data ppdata; > + struct device *dev = &pdev->dev; > + struct cqspi_st *cqspi; > + struct spi_nor *nor; > + struct mtd_info *mtd; > + struct resource *res; > + struct resource *res_ahb; > + int ret; > + int irq; > + > + cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL); > + if (!cqspi) > + return -ENOMEM; > + > + cqspi->pdev = pdev; > + platform_set_drvdata(pdev, cqspi); > + > + ret = cqspi_of_get_pdata(pdev); > + if (ret) { > + dev_err(dev, "Get platform data failed.\n"); > + return -ENODEV; > + } > + > + cqspi->clk = devm_clk_get(dev, NULL); > + if (IS_ERR(cqspi->clk)) { > + dev_err(dev, "cannot get qspi clk\n"); > + ret = PTR_ERR(cqspi->clk); > + goto probe_failed; > + } > + cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk); > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + cqspi->iobase = devm_ioremap_resource(dev, res); > + if (IS_ERR(cqspi->iobase)) { > + dev_err(dev, "devm_ioremap_resource res 0 failed\n"); > + ret = PTR_ERR(cqspi->iobase); > + goto probe_failed; > + } > + > + res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1); > + cqspi->ahb_phy_addr = res_ahb->start; > + cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb); > + if (IS_ERR(cqspi->ahb_base)) { > + dev_err(dev, "devm_ioremap_resource res 1 failed\n"); > + ret = PTR_ERR(cqspi->ahb_base); > + goto probe_failed; > + } > + > + init_completion(&cqspi->transfer_complete); > + > + irq = platform_get_irq(pdev, 0); > + if (irq < 0) { > + dev_err(dev, "platform_get_irq failed\n"); > + ret = -ENXIO; > + goto probe_failed; > + } > + ret = devm_request_irq(dev, irq, > + cqspi_irq_handler, 0, pdev->name, cqspi); > + if (ret) { > + dev_err(dev, "devm_request_irq failed\n"); > + goto probe_failed; > + } > + > + cqspi_wait_idle(cqspi); > + cqspi_controller_init(cqspi); > + cqspi->current_cs = -1; > + cqspi->sclk = 0; > + > + /* Get flash device data */ > + for_each_available_child_of_node(dev->of_node, np) { > + unsigned int cs; > + struct cqspi_flash_pdata *f_pdata; > + > + if (of_property_read_u32(np, "reg", &cs)) { > + dev_err(dev, "couldn't determine chip select\n"); > + return -ENXIO; > + } > + if (cs >= CQSPI_MAX_CHIPSELECT) { > + dev_err(dev, "chip select %d out of range\n", cs); > + return -ENXIO; > + } > + f_pdata = &cqspi->f_pdata[cs]; > + > + ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np); > + if (ret) > + goto probe_failed; > + > + nor = &f_pdata->nor; > + mtd = &f_pdata->mtd; > + > + nor->mtd = mtd; > + nor->dev = dev; > + nor->priv = cqspi; > + mtd->priv = nor; > + > + nor->read_reg = cqspi_read_reg; > + nor->write_reg = cqspi_write_reg; > + nor->read = cqspi_read; > + nor->write = cqspi_write; > + nor->erase = cqspi_erase; > + > + nor->prepare = cqspi_prep; > + > + /* > + * Here is a 'nasty hack' from Marek Vasut to pick > + * up OF properties from flash device subnode. > + */ > + nor->dev->of_node = np; > + > + ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD); > + if (ret) > + goto probe_failed; > + > + if (nor->read_dummy > CQSPI_DUMMY_CLKS_MAX) > + nor->read_dummy = CQSPI_DUMMY_CLKS_MAX; > + > + ppdata.of_node = np; > + ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); > + if (ret) > + goto probe_failed; > + } > + > + dev_info(dev, "Cadence QSPI NOR flash driver\n"); > + return 0; > + > + probe_failed: > + dev_err(dev, "Cadence QSPI NOR probe failed %d\n", ret); > + cqspi_remove(pdev); > + return ret; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int cqspi_suspend(struct device *dev) > +{ > + struct cqspi_st *cqspi = dev_get_drvdata(dev); > + > + cqspi_controller_disable(cqspi); > + return 0; > +} > + > +static int cqspi_resume(struct device *dev) > +{ > + struct cqspi_st *cqspi = dev_get_drvdata(dev); > + > + cqspi_controller_enable(cqspi); > + return 0; > +} > + > +static const struct dev_pm_ops cqspi__dev_pm_ops = { > + .suspend = cqspi_suspend, > + .resume = cqspi_resume, > +}; > + > +#define CQSPI_DEV_PM_OPS (&cqspi__dev_pm_ops) > +#else > +#define CQSPI_DEV_PM_OPS NULL > +#endif > + > +static struct of_device_id const cqspi_dt_ids[] = { > + {.compatible = "cdns,qspi-nor",}, > + { /* end of table */ } > +}; > + > +MODULE_DEVICE_TABLE(of, cqspi_dt_ids); > + > +static struct platform_driver cqspi_platform_driver = { > + .probe = cqspi_probe, > + .remove = cqspi_remove, > + .driver = { > + .name = CQSPI_NAME, > + .pm = CQSPI_DEV_PM_OPS, > + .of_match_table = cqspi_dt_ids, > + }, > +}; > + > +module_platform_driver(cqspi_platform_driver); > + > +MODULE_DESCRIPTION("Cadence QSPI Controller Driver"); > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("platform:" CQSPI_NAME); > +MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>"); > +MODULE_AUTHOR("Graham Moore <grmoore@opensource.altera.com>"); > -- > 1.7.9.5 > > . >
On Wednesday, August 05, 2015 at 08:29:11 PM, vikasm wrote: > Hi Graham, Hi vikasm, > On 07/28/2015 10:38 AM, Graham Moore wrote: > > Signed-off-by: Graham Moore <grmoore@opensource.altera.com> > > --- > > V2: use NULL instead of modalias in spi_nor_scan call > > V3: Use existing property is-decoded-cs instead of creating duplicate. > > V4: Support Micron quad mode by snooping command stream for EVCR command > > and subsequently configuring Cadence controller for quad mode. > > V5: Clean up sparse and smatch complaints. Remove snooping of Micron > > quad mode. Add comment on XIP mode bit and dummy clock cycles. Set > > up SRAM partition at 1:1 during init. > > V6: Remove dts patch that was included by mistake. Incorporate Vikas's > > comments regarding fifo width, SRAM partition setting, and trigger > > address. Trigger address was added as an unsigned int, as it is not > > an IO resource per se, and does not need to be mapped. Also add > > Marek Vasut's workaround for picking up OF properties on subnodes. > > I am still not able to apply this patch to master. It seems to be rebased > on master for ..spi-nor/Kconfig & spi-nor/makefile. I'm able to apply this on next/master just fine. > Also I still see spaces are still not replaced by tabs in this version. Which exact spots are you talking about ? I don't see that many indent flubs in this patch to be honest. Sometimes, it is better to indent the last piece with spaces (mandated by kernel coding style btw) to increase the readability. This is in particular the case with stuff like this: pr_err("formating string that is almost 80 chars long %i!\n", parameter_that_is_indented_with_7_spaces); The sole purpose is to align stuff right under the opening parenthesis. > > --- btw. would you please learn to use [...] and keep only the part you're commenting on with a bit of context in your reply? It is really hard to locate your comment if it's inbetween 500 lines of nothing. [...] > > +static int cqspi_indirect_read_setup(struct spi_nor *nor, > > + unsigned int from_addr) > > +{ > > + unsigned int reg; > > + unsigned int dummy_clk = 0; > > + struct cqspi_st *cqspi = nor->priv; > > + void __iomem *reg_base = cqspi->iobase; > > + > > + writel(cqspi->trigger_address, > > + reg_base + CQSPI_REG_INDIRECTTRIGGER); > > move indirect trigger configuration in init, no need to do it for every > read & write. Fixed. > > + writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR); > > + > > + reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB; > > + reg |= cqspi_calc_rdreg(nor, nor->read_opcode); > > + > > + /* Setup dummy clock cycles */ > > +#define CQSPI_SUPPORT_XIP_CHIPS > > +#ifdef CQSPI_SUPPORT_XIP_CHIPS > > + /* > > + * Set mode bits high to ensure chip doesn't enter XIP. > > + * This results in an extra 8 dummy clocks so > > + * we must account for them. > > + */ > > + writel(0xFF, reg_base + CQSPI_REG_MODE_BIT); > > + reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB); > > + if (nor->read_dummy >= 8) > > + dummy_clk = nor->read_dummy - 8; > > + else > > + dummy_clk = 0; > > +#else > > + dummy_clk = nor->read_dummy; > > +#endif > > + reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK) > > + << CQSPI_REG_RD_INSTR_DUMMY_LSB; > > + > > + writel(reg, reg_base + CQSPI_REG_RD_INSTR); > > + > > + /* Set address width */ > > + reg = readl(reg_base + CQSPI_REG_SIZE); > > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > > + reg |= (nor->addr_width - 1); > > + writel(reg, reg_base + CQSPI_REG_SIZE); > > + return 0; > > +} > > + > > +static int cqspi_indirect_read_execute(struct spi_nor *nor, > > + u8 *rxbuf, unsigned n_rx) > > +{ > > + int ret = 0; > > + unsigned int reg = 0; > > + unsigned int bytes_to_read = 0; > > + unsigned int timeout; > > + unsigned int watermark; > > + struct cqspi_st *cqspi = nor->priv; > > + void __iomem *reg_base = cqspi->iobase; > > + void __iomem *ahb_base = cqspi->ahb_base; > > + int remaining = (int)n_rx; > > + > > + watermark = cqspi->fifo_depth * cqspi->fifo_width / 2; > > + writel(watermark, reg_base + CQSPI_REG_INDIRECTRDWATERMARK); > > I think watermark configuration can be moved to init also & there should > not be any need to configuration it for every read. Fixed. > > + writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES); > > + > > + /* Clear all interrupts. */ > > + writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); > > + > > + cqspi->irq_mask = CQSPI_IRQ_MASK_RD; > > + writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK); > > + > > + reinit_completion(&cqspi->transfer_complete); > > + writel(CQSPI_REG_INDIRECTRD_START_MASK, > > + reg_base + CQSPI_REG_INDIRECTRD); > > + > > + while (remaining > 0) { > > + ret = > > wait_for_completion_timeout(&cqspi->transfer_complete, + > > msecs_to_jiffies + > > (CQSPI_READ_TIMEOUT_MS)); + > > + bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base); > > There should not be any need to read SRAM level, we should be able to get > rid of it like in u-boot. Can you explain why ? > > + > > + if (!ret && bytes_to_read == 0) { > > + dev_err(nor->dev, "Indirect read timeout, no > > bytes\n"); + ret = -ETIMEDOUT; > > + goto failrd; > > + } > > + > > + while (bytes_to_read != 0) { > > + bytes_to_read *= cqspi->fifo_width; > > + bytes_to_read = bytes_to_read > remaining > > + ? remaining : bytes_to_read; > > + cqspi_fifo_read(rxbuf, ahb_base, bytes_to_read); > > + rxbuf += bytes_to_read; > > + remaining -= bytes_to_read; > > + bytes_to_read = > > CQSPI_GET_RD_SRAM_LEVEL(reg_base); + } > > + } > > + > > + /* Check indirect done status */ > > + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); > > + while (cqspi_check_timeout(timeout)) { > > + reg = readl(reg_base + CQSPI_REG_INDIRECTRD); > > + if (reg & CQSPI_REG_INDIRECTRD_DONE_MASK) > > + break; > > + } > > + > > + if (!(reg & CQSPI_REG_INDIRECTRD_DONE_MASK)) { > > + dev_err(nor->dev, > > + "Indirect read completion error 0x%08x\n", reg); > > + ret = -ETIMEDOUT; > > + goto failrd; > > + } > > + > > + /* Disable interrupt */ > > + writel(0, reg_base + CQSPI_REG_IRQMASK); > > + > > + /* Clear indirect completion status */ > > + writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + > > CQSPI_REG_INDIRECTRD); + > > + return 0; > > + > > + failrd: > > + /* Disable interrupt */ > > + writel(0, reg_base + CQSPI_REG_IRQMASK); > > + > > + /* Cancel the indirect read */ > > + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, > > + reg_base + CQSPI_REG_INDIRECTRD); > > + return ret; > > +} > > + > > +static int cqspi_indirect_write_setup(struct spi_nor *nor, unsigned int > > to_addr) +{ > > + unsigned int reg; > > + struct cqspi_st *cqspi = nor->priv; > > + void __iomem *reg_base = cqspi->iobase; > > + > > + /* Set opcode. */ > > + reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB; > > + writel(reg, reg_base + CQSPI_REG_WR_INSTR); > > + reg = cqspi_calc_rdreg(nor, nor->program_opcode); > > + writel(reg, reg_base + CQSPI_REG_RD_INSTR); > > + > > + writel(cqspi->trigger_address, > > + reg_base + CQSPI_REG_INDIRECTTRIGGER); > > + writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR); > > move it to init also. I assume you mean the trigger address, not the write start address ? > > + > > + reg = readl(reg_base + CQSPI_REG_SIZE); > > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > > + reg |= (nor->addr_width - 1); > > + writel(reg, reg_base + CQSPI_REG_SIZE); > > + return 0; > > +} > > + > > +static int cqspi_indirect_write_execute(struct spi_nor *nor, > > + const u8 *txbuf, unsigned n_tx) > > +{ > > + int ret; > > + unsigned int timeout; > > + unsigned int reg = 0; > > + struct cqspi_st *cqspi = nor->priv; > > + void __iomem *reg_base = cqspi->iobase; > > + int remaining = (int)n_tx; > > + struct cqspi_flash_pdata *f_pdata; > > + unsigned int page_size; > > + unsigned int write_bytes; > > + > > + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; > > + page_size = nor->page_size; > > + > > + writel(CQSPI_REG_SRAM_THRESHOLD_BYTES, reg_base + > > + CQSPI_REG_INDIRECTWRWATERMARK); > > should be able to move it to init OK [...]
Hi Marek, > -----Original Message----- > From: Marek Vasut [mailto:marex@denx.de] > Sent: Wednesday, August 05, 2015 4:15 PM > To: Vikas MANOCHA > Cc: Graham Moore; linux-mtd@lists.infradead.org; David Woodhouse; Brian > Norris; linux-kernel@vger.kernel.org; Alan Tull; Dinh Nguyen; Yves > Vandervennet > Subject: Re: [PATCH V6 2/2] mtd: spi-nor: Add driver for Cadence Quad SPI > Flash Controller. > > On Wednesday, August 05, 2015 at 08:29:11 PM, vikasm wrote: > > Hi Graham, > > Hi vikasm, > > > On 07/28/2015 10:38 AM, Graham Moore wrote: > > > Signed-off-by: Graham Moore <grmoore@opensource.altera.com> > > > --- > > > V2: use NULL instead of modalias in spi_nor_scan call > > > V3: Use existing property is-decoded-cs instead of creating duplicate. > > > V4: Support Micron quad mode by snooping command stream for EVCR > > > command and subsequently configuring Cadence controller for quad > mode. > > > V5: Clean up sparse and smatch complaints. Remove snooping of > > > Micron quad mode. Add comment on XIP mode bit and dummy clock > > > cycles. Set up SRAM partition at 1:1 during init. > > > V6: Remove dts patch that was included by mistake. Incorporate > > > Vikas's comments regarding fifo width, SRAM partition setting, and > > > trigger address. Trigger address was added as an unsigned int, as > > > it is not an IO resource per se, and does not need to be mapped. > > > Also add Marek Vasut's workaround for picking up OF properties on > subnodes. > > > > I am still not able to apply this patch to master. It seems to be > > rebased on master for ..spi-nor/Kconfig & spi-nor/makefile. > > I'm able to apply this on next/master just fine. I think my thunderbird client is messing up with the patch, I am trying to fix it. > > > Also I still see spaces are still not replaced by tabs in this version. > > Which exact spots are you talking about ? I don't see that many indent flubs > in this patch to be honest. Sometimes, it is better to indent the last piece > with spaces (mandated by kernel coding style btw) to increase the > readability. > > This is in particular the case with stuff like this: > > pr_err("formating string that is almost 80 chars long %i!\n", > parameter_that_is_indented_with_7_spaces); > > The sole purpose is to align stuff right under the opening parenthesis. > > > > --- > > btw. would you please learn to use [...] and keep only the part you're > commenting on with a bit of context in your reply? It is really hard to locate > your comment if it's inbetween 500 lines of nothing. > > [...] Thanks Marek, I am not sure how to use it. I would appreciate any help. > > > > +static int cqspi_indirect_read_setup(struct spi_nor *nor, > > > + unsigned int from_addr) { > > > + unsigned int reg; > > > + unsigned int dummy_clk = 0; > > > + struct cqspi_st *cqspi = nor->priv; > > > + void __iomem *reg_base = cqspi->iobase; > > > + > > > + writel(cqspi->trigger_address, > > > + reg_base + CQSPI_REG_INDIRECTTRIGGER); > > > > move indirect trigger configuration in init, no need to do it for > > every read & write. > > Fixed. > > > > + writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR); > > > + > > > + reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB; > > > + reg |= cqspi_calc_rdreg(nor, nor->read_opcode); > > > + > > > + /* Setup dummy clock cycles */ #define > > > +CQSPI_SUPPORT_XIP_CHIPS #ifdef CQSPI_SUPPORT_XIP_CHIPS > > > + /* > > > + * Set mode bits high to ensure chip doesn't enter XIP. > > > + * This results in an extra 8 dummy clocks so > > > + * we must account for them. > > > + */ > > > + writel(0xFF, reg_base + CQSPI_REG_MODE_BIT); > > > + reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB); > > > + if (nor->read_dummy >= 8) > > > + dummy_clk = nor->read_dummy - 8; > > > + else > > > + dummy_clk = 0; > > > +#else > > > + dummy_clk = nor->read_dummy; #endif > > > + reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK) > > > + << CQSPI_REG_RD_INSTR_DUMMY_LSB; > > > + > > > + writel(reg, reg_base + CQSPI_REG_RD_INSTR); > > > + > > > + /* Set address width */ > > > + reg = readl(reg_base + CQSPI_REG_SIZE); > > > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > > > + reg |= (nor->addr_width - 1); > > > + writel(reg, reg_base + CQSPI_REG_SIZE); > > > + return 0; > > > +} > > > + > > > +static int cqspi_indirect_read_execute(struct spi_nor *nor, > > > + u8 *rxbuf, unsigned n_rx) { > > > + int ret = 0; > > > + unsigned int reg = 0; > > > + unsigned int bytes_to_read = 0; > > > + unsigned int timeout; > > > + unsigned int watermark; > > > + struct cqspi_st *cqspi = nor->priv; > > > + void __iomem *reg_base = cqspi->iobase; > > > + void __iomem *ahb_base = cqspi->ahb_base; > > > + int remaining = (int)n_rx; > > > + > > > + watermark = cqspi->fifo_depth * cqspi->fifo_width / 2; > > > + writel(watermark, reg_base + > CQSPI_REG_INDIRECTRDWATERMARK); > > > > I think watermark configuration can be moved to init also & there > > should not be any need to configuration it for every read. > > Fixed. > > > > + writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES); > > > + > > > + /* Clear all interrupts. */ > > > + writel(CQSPI_IRQ_STATUS_MASK, reg_base + > > > + CQSPI_REG_IRQSTATUS); > > > + > > > + cqspi->irq_mask = CQSPI_IRQ_MASK_RD; > > > + writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK); > > > + > > > + reinit_completion(&cqspi->transfer_complete); > > > + writel(CQSPI_REG_INDIRECTRD_START_MASK, > > > + reg_base + CQSPI_REG_INDIRECTRD); > > > + > > > + while (remaining > 0) { > > > + ret = > > > wait_for_completion_timeout(&cqspi->transfer_complete, + > > > msecs_to_jiffies + > > > (CQSPI_READ_TIMEOUT_MS)); + > > > + bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base); > > > > There should not be any need to read SRAM level, we should be able to > > get rid of it like in u-boot. > > Can you explain why ? There is no need to check for sram fill level. If sram is empty, cpu will go in the wait state till the time data is available from flash. Also Relying on SRAM fill level only for deciding when the data should befetched from the local SRAM is not most efficient approach, particularly if we are working on high data rates. After one SRAM word is collected, the information is forwarded into system domain and then synchronized into register domain (apb). If we are using slow APB and AHB clks, SRAM fill level might not be up-to-dated because of latency cycles needed for synchronization. For example in case we are getting SRAM fill level equal to 10 locations but in reality there were 2 another words completed and actual level is 12 but information may not be synchronized yet because of the synchronization latency on APB domain. > > > > + > > > + if (!ret && bytes_to_read == 0) { > > > + dev_err(nor->dev, "Indirect read timeout, no > > > bytes\n"); + ret = -ETIMEDOUT; > > > + goto failrd; > > > + } > > > + > > > + while (bytes_to_read != 0) { > > > + bytes_to_read *= cqspi->fifo_width; > > > + bytes_to_read = bytes_to_read > remaining > > > + ? remaining : bytes_to_read; > > > + cqspi_fifo_read(rxbuf, ahb_base, bytes_to_read); > > > + rxbuf += bytes_to_read; > > > + remaining -= bytes_to_read; > > > + bytes_to_read = > > > CQSPI_GET_RD_SRAM_LEVEL(reg_base); + } > > > + } > > > + > > > + /* Check indirect done status */ > > > + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); > > > + while (cqspi_check_timeout(timeout)) { > > > + reg = readl(reg_base + CQSPI_REG_INDIRECTRD); > > > + if (reg & CQSPI_REG_INDIRECTRD_DONE_MASK) > > > + break; > > > + } > > > + > > > + if (!(reg & CQSPI_REG_INDIRECTRD_DONE_MASK)) { > > > + dev_err(nor->dev, > > > + "Indirect read completion error 0x%08x\n", reg); > > > + ret = -ETIMEDOUT; > > > + goto failrd; > > > + } > > > + > > > + /* Disable interrupt */ > > > + writel(0, reg_base + CQSPI_REG_IRQMASK); > > > + > > > + /* Clear indirect completion status */ > > > + writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + > > > CQSPI_REG_INDIRECTRD); + > > > + return 0; > > > + > > > + failrd: > > > + /* Disable interrupt */ > > > + writel(0, reg_base + CQSPI_REG_IRQMASK); > > > + > > > + /* Cancel the indirect read */ > > > + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, > > > + reg_base + CQSPI_REG_INDIRECTRD); > > > + return ret; > > > +} > > > + > > > +static int cqspi_indirect_write_setup(struct spi_nor *nor, unsigned > > > +int > > > to_addr) +{ > > > + unsigned int reg; > > > + struct cqspi_st *cqspi = nor->priv; > > > + void __iomem *reg_base = cqspi->iobase; > > > + > > > + /* Set opcode. */ > > > + reg = nor->program_opcode << > CQSPI_REG_WR_INSTR_OPCODE_LSB; > > > + writel(reg, reg_base + CQSPI_REG_WR_INSTR); > > > + reg = cqspi_calc_rdreg(nor, nor->program_opcode); > > > + writel(reg, reg_base + CQSPI_REG_RD_INSTR); > > > + > > > + writel(cqspi->trigger_address, > > > + reg_base + CQSPI_REG_INDIRECTTRIGGER); > > > + writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR); > > > > move it to init also. > > I assume you mean the trigger address, not the write start address ? Yes, you are right. Rgds, Vikas > > > > + > > > + reg = readl(reg_base + CQSPI_REG_SIZE); > > > + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; > > > + reg |= (nor->addr_width - 1); > > > + writel(reg, reg_base + CQSPI_REG_SIZE); > > > + return 0; > > > +} > > > + > > > +static int cqspi_indirect_write_execute(struct spi_nor *nor, > > > + const u8 *txbuf, unsigned > > > +n_tx) { > > > + int ret; > > > + unsigned int timeout; > > > + unsigned int reg = 0; > > > + struct cqspi_st *cqspi = nor->priv; > > > + void __iomem *reg_base = cqspi->iobase; > > > + int remaining = (int)n_tx; > > > + struct cqspi_flash_pdata *f_pdata; > > > + unsigned int page_size; > > > + unsigned int write_bytes; > > > + > > > + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; > > > + page_size = nor->page_size; > > > + > > > + writel(CQSPI_REG_SRAM_THRESHOLD_BYTES, reg_base + > > > + CQSPI_REG_INDIRECTWRWATERMARK); > > > > should be able to move it to init > > OK > > [...]
On Wednesday, August 12, 2015 at 03:05:48 AM, Vikas MANOCHA wrote: > Hi Marek, Hi, > > -----Original Message----- > > From: Marek Vasut [mailto:marex@denx.de] > > Sent: Wednesday, August 05, 2015 4:15 PM > > To: Vikas MANOCHA > > Cc: Graham Moore; linux-mtd@lists.infradead.org; David Woodhouse; Brian > > Norris; linux-kernel@vger.kernel.org; Alan Tull; Dinh Nguyen; Yves > > Vandervennet > > Subject: Re: [PATCH V6 2/2] mtd: spi-nor: Add driver for Cadence Quad SPI > > Flash Controller. > > > > On Wednesday, August 05, 2015 at 08:29:11 PM, vikasm wrote: > > > Hi Graham, > > > > Hi vikasm, > > > > > On 07/28/2015 10:38 AM, Graham Moore wrote: > > > > Signed-off-by: Graham Moore <grmoore@opensource.altera.com> > > > > --- > > > > V2: use NULL instead of modalias in spi_nor_scan call > > > > V3: Use existing property is-decoded-cs instead of creating > > > > duplicate. V4: Support Micron quad mode by snooping command stream > > > > for EVCR command and subsequently configuring Cadence controller for > > > > quad > > > > mode. > > > > > > V5: Clean up sparse and smatch complaints. Remove snooping of > > > > Micron quad mode. Add comment on XIP mode bit and dummy clock > > > > cycles. Set up SRAM partition at 1:1 during init. > > > > V6: Remove dts patch that was included by mistake. Incorporate > > > > Vikas's comments regarding fifo width, SRAM partition setting, and > > > > trigger address. Trigger address was added as an unsigned int, as > > > > it is not an IO resource per se, and does not need to be mapped. > > > > Also add Marek Vasut's workaround for picking up OF properties on > > > > subnodes. > > > > > I am still not able to apply this patch to master. It seems to be > > > rebased on master for ..spi-nor/Kconfig & spi-nor/makefile. > > > > I'm able to apply this on next/master just fine. > > I think my thunderbird client is messing up with the patch, I am trying to > fix it. OK > > > Also I still see spaces are still not replaced by tabs in this version. > > > > Which exact spots are you talking about ? I don't see that many indent > > flubs in this patch to be honest. Sometimes, it is better to indent the > > last piece with spaces (mandated by kernel coding style btw) to increase > > the readability. > > > > This is in particular the case with stuff like this: > > > > pr_err("formating string that is almost 80 chars long %i!\n", > > > > parameter_that_is_indented_with_7_spaces); > > > > The sole purpose is to align stuff right under the opening parenthesis. > > > > > > --- > > > > btw. would you please learn to use [...] and keep only the part you're > > commenting on with a bit of context in your reply? It is really hard to > > locate your comment if it's inbetween 500 lines of nothing. > > > > [...] > > Thanks Marek, I am not sure how to use it. I would appreciate any help. That's rather simple in fact, but it really depends on your UI. TL;DR, select the irrelevant piece of email and replace it with [...] . [...] > > > > + writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES); > > > > + > > > > + /* Clear all interrupts. */ > > > > + writel(CQSPI_IRQ_STATUS_MASK, reg_base + > > > > + CQSPI_REG_IRQSTATUS); > > > > + > > > > + cqspi->irq_mask = CQSPI_IRQ_MASK_RD; > > > > + writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK); > > > > + > > > > + reinit_completion(&cqspi->transfer_complete); > > > > + writel(CQSPI_REG_INDIRECTRD_START_MASK, > > > > + reg_base + CQSPI_REG_INDIRECTRD); > > > > + > > > > + while (remaining > 0) { > > > > + ret = > > > > wait_for_completion_timeout(&cqspi->transfer_complete, + > > > > > > > > msecs_to_jiffies + > > > > > > > > (CQSPI_READ_TIMEOUT_MS)); + > > > > > > > > + bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base); > > > > > > There should not be any need to read SRAM level, we should be able to > > > get rid of it like in u-boot. > > > > Can you explain why ? > > There is no need to check for sram fill level. If sram is empty, cpu will > go in the wait state till the time data is available from flash. You mean reading from SRAM will stall the CPU ? > Also Relying on SRAM fill level only for deciding when the data should > befetched from the local SRAM is not most efficient approach, particularly > if we are working on high data rates. > > After one SRAM word is collected, the information is forwarded into system > domain and then synchronized into register domain (apb). If we are using > slow APB and AHB clks, SRAM fill level might not be up-to-dated because of > latency cycles needed for synchronization. For example in case we are > getting SRAM fill level equal to 10 locations but in reality there were 2 > another words completed and actual level is 12 but information may not be > synchronized yet because of the synchronization latency on APB domain. We use the SRAM level only to determine how many bytes at minimum can we safely read. If there are more data waiting, but the SRAM level is not yet updated, we will keep looping here until the update happens, right ? Though I agree this is not the most efficient method either. Can the CQSPI do DMA and deliver the data to CPU's RAM somehow on it's own maybe ? Thanks!
Hi Marek, On 08/12/2015 02:11 AM, Marek Vasut wrote: > On Wednesday, August 12, 2015 at 03:05:48 AM, Vikas MANOCHA wrote: >> Hi Marek, > > Hi, > >>> -----Original Message----- >>> From: Marek Vasut [mailto:marex@denx.de] >>> Sent: Wednesday, August 05, 2015 4:15 PM >>> To: Vikas MANOCHA >>> Cc: Graham Moore; linux-mtd@lists.infradead.org; David Woodhouse; Brian >>> Norris; linux-kernel@vger.kernel.org; Alan Tull; Dinh Nguyen; Yves >>> Vandervennet >>> Subject: Re: [PATCH V6 2/2] mtd: spi-nor: Add driver for Cadence Quad SPI >>> Flash Controller. >>> >>> On Wednesday, August 05, 2015 at 08:29:11 PM, vikasm wrote: >>>> Hi Graham, >>> >>> Hi vikasm, >>> >>>> On 07/28/2015 10:38 AM, Graham Moore wrote: >>>>> Signed-off-by: Graham Moore <grmoore@opensource.altera.com> >>>>> --- >>>>> V2: use NULL instead of modalias in spi_nor_scan call >>>>> V3: Use existing property is-decoded-cs instead of creating >>>>> duplicate. V4: Support Micron quad mode by snooping command stream >>>>> for EVCR command and subsequently configuring Cadence controller for >>>>> quad >>> >>> mode. >>> >>>>> V5: Clean up sparse and smatch complaints. Remove snooping of >>>>> Micron quad mode. Add comment on XIP mode bit and dummy clock >>>>> cycles. Set up SRAM partition at 1:1 during init. >>>>> V6: Remove dts patch that was included by mistake. Incorporate >>>>> Vikas's comments regarding fifo width, SRAM partition setting, and >>>>> trigger address. Trigger address was added as an unsigned int, as >>>>> it is not an IO resource per se, and does not need to be mapped. >>>>> Also add Marek Vasut's workaround for picking up OF properties on >>> >>> subnodes. >>> >>>> I am still not able to apply this patch to master. It seems to be >>>> rebased on master for ..spi-nor/Kconfig & spi-nor/makefile. >>> >>> I'm able to apply this on next/master just fine. >> >> I think my thunderbird client is messing up with the patch, I am trying to >> fix it. > > OK > >>>> Also I still see spaces are still not replaced by tabs in this version. >>> >>> Which exact spots are you talking about ? I don't see that many indent >>> flubs in this patch to be honest. Sometimes, it is better to indent the >>> last piece with spaces (mandated by kernel coding style btw) to increase >>> the readability. >>> >>> This is in particular the case with stuff like this: >>> >>> pr_err("formating string that is almost 80 chars long %i!\n", >>> >>> parameter_that_is_indented_with_7_spaces); >>> >>> The sole purpose is to align stuff right under the opening parenthesis. >>> >>>>> --- >>> >>> btw. would you please learn to use [...] and keep only the part you're >>> commenting on with a bit of context in your reply? It is really hard to >>> locate your comment if it's inbetween 500 lines of nothing. >>> >>> [...] >> >> Thanks Marek, I am not sure how to use it. I would appreciate any help. > > That's rather simple in fact, but it really depends on your UI. > TL;DR, select the irrelevant piece of email and replace it with [...] . > > [...] > ok, thanks I will try to use it. >>>>> + writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES); >>>>> + >>>>> + /* Clear all interrupts. */ >>>>> + writel(CQSPI_IRQ_STATUS_MASK, reg_base + >>>>> + CQSPI_REG_IRQSTATUS); >>>>> + >>>>> + cqspi->irq_mask = CQSPI_IRQ_MASK_RD; >>>>> + writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK); >>>>> + >>>>> + reinit_completion(&cqspi->transfer_complete); >>>>> + writel(CQSPI_REG_INDIRECTRD_START_MASK, >>>>> + reg_base + CQSPI_REG_INDIRECTRD); >>>>> + >>>>> + while (remaining > 0) { >>>>> + ret = >>>>> wait_for_completion_timeout(&cqspi->transfer_complete, + >>>>> >>>>> msecs_to_jiffies + >>>>> >>>>> (CQSPI_READ_TIMEOUT_MS)); + >>>>> >>>>> + bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base); >>>> >>>> There should not be any need to read SRAM level, we should be able to >>>> get rid of it like in u-boot. >>> >>> Can you explain why ? >> >> There is no need to check for sram fill level. If sram is empty, cpu will >> go in the wait state till the time data is available from flash. > > You mean reading from SRAM will stall the CPU ? yes, till the time data is available. Simple timeout could avoid longer wait cycles. > >> Also Relying on SRAM fill level only for deciding when the data should >> befetched from the local SRAM is not most efficient approach, particularly >> if we are working on high data rates. >> >> After one SRAM word is collected, the information is forwarded into system >> domain and then synchronized into register domain (apb). If we are using >> slow APB and AHB clks, SRAM fill level might not be up-to-dated because of >> latency cycles needed for synchronization. For example in case we are >> getting SRAM fill level equal to 10 locations but in reality there were 2 >> another words completed and actual level is 12 but information may not be >> synchronized yet because of the synchronization latency on APB domain. > > We use the SRAM level only to determine how many bytes at minimum can we safely > read. If there are more data waiting, but the SRAM level is not yet updated, we > will keep looping here until the update happens, right ? > > Though I agree this is not the most efficient method either. Can the CQSPI do > DMA and deliver the data to CPU's RAM somehow on it's own maybe ? If DMA is connected, it should be possible like with peripheral as flow controller. It would depend on SOC arch. Some SOC might not support DMA with qspi periphral. But for sure DMA usage seems most efficient. Rgds, Vikas > > Thanks! > . >
diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig index 64a4f0e..9485481 100644 --- a/drivers/mtd/spi-nor/Kconfig +++ b/drivers/mtd/spi-nor/Kconfig @@ -28,4 +28,10 @@ config SPI_FSL_QUADSPI This enables support for the Quad SPI controller in master mode. We only connect the NOR to this controller now. +config SPI_CADENCE_QUADSPI + tristate "Cadence Quad SPI controller" + depends on ARCH_SOCFPGA + help + This enables support for the Cadence Quad SPI controller and NOR flash. + endif # MTD_SPI_NOR diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile index 6a7ce14..372628c 100644 --- a/drivers/mtd/spi-nor/Makefile +++ b/drivers/mtd/spi-nor/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o +obj-$(CONFIG_SPI_CADENCE_QUADSPI) += cadence-quadspi.o obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c new file mode 100644 index 0000000..076e9c9 --- /dev/null +++ b/drivers/mtd/spi-nor/cadence-quadspi.c @@ -0,0 +1,1276 @@ +/* + * Driver for Cadence QSPI Controller + * + * Copyright Altera Corporation (C) 2012-2014. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> +#include <linux/mtd/spi-nor.h> +#include <linux/of_device.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/spi/spi.h> +#include <linux/timer.h> + +#define CQSPI_NAME "cadence-qspi" +#define CQSPI_MAX_CHIPSELECT 16 + +struct cqspi_flash_pdata { + struct mtd_info mtd; + struct spi_nor nor; + u32 clk_rate; + unsigned int read_delay; + unsigned int tshsl_ns; + unsigned int tsd2d_ns; + unsigned int tchsh_ns; + unsigned int tslch_ns; +}; + +struct cqspi_st { + struct platform_device *pdev; + + struct clk *clk; + unsigned int sclk; + + void __iomem *iobase; + void __iomem *ahb_base; + struct completion transfer_complete; + unsigned int irq_mask; + int current_cs; + unsigned int ahb_phy_addr; + unsigned int master_ref_clk_hz; + u32 is_decoded_cs; + unsigned int fifo_depth; + unsigned int fifo_width; + unsigned int trigger_address; + struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT]; +}; + +/* Operation timeout value */ +#define CQSPI_TIMEOUT_MS 500 +#define CQSPI_READ_TIMEOUT_MS 10 +#define CQSPI_POLL_IDLE_RETRY 3 + +#define CQSPI_REG_SRAM_RESV_WORDS 2 +#define CQSPI_REG_SRAM_PARTITION_WR 1 +#define CQSPI_REG_SRAM_THRESHOLD_BYTES 50 + +/* Instruction type */ +#define CQSPI_INST_TYPE_SINGLE 0 +#define CQSPI_INST_TYPE_DUAL 1 +#define CQSPI_INST_TYPE_QUAD 2 + +#define CQSPI_DUMMY_CLKS_MAX 31 + +#define CQSPI_STIG_DATA_LEN_MAX 8 + +/* Register map */ +#define CQSPI_REG_CONFIG 0x00 +#define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0) +#define CQSPI_REG_CONFIG_DECODE_MASK BIT(9) +#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10 +#define CQSPI_REG_CONFIG_DMA_MASK BIT(15) +#define CQSPI_REG_CONFIG_BAUD_LSB 19 +#define CQSPI_REG_CONFIG_IDLE_LSB 31 +#define CQSPI_REG_CONFIG_CHIPSELECT_MASK 0xF +#define CQSPI_REG_CONFIG_BAUD_MASK 0xF + +#define CQSPI_REG_RD_INSTR 0x04 +#define CQSPI_REG_RD_INSTR_OPCODE_LSB 0 +#define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB 8 +#define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB 12 +#define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB 16 +#define CQSPI_REG_RD_INSTR_MODE_EN_LSB 20 +#define CQSPI_REG_RD_INSTR_DUMMY_LSB 24 +#define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK 0x3 +#define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK 0x3 +#define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK 0x3 +#define CQSPI_REG_RD_INSTR_DUMMY_MASK 0x1F + +#define CQSPI_REG_WR_INSTR 0x08 +#define CQSPI_REG_WR_INSTR_OPCODE_LSB 0 +#define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB 12 +#define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16 + +#define CQSPI_REG_DELAY 0x0C +#define CQSPI_REG_DELAY_TSLCH_LSB 0 +#define CQSPI_REG_DELAY_TCHSH_LSB 8 +#define CQSPI_REG_DELAY_TSD2D_LSB 16 +#define CQSPI_REG_DELAY_TSHSL_LSB 24 +#define CQSPI_REG_DELAY_TSLCH_MASK 0xFF +#define CQSPI_REG_DELAY_TCHSH_MASK 0xFF +#define CQSPI_REG_DELAY_TSD2D_MASK 0xFF +#define CQSPI_REG_DELAY_TSHSL_MASK 0xFF + +#define CQSPI_REG_READCAPTURE 0x10 +#define CQSPI_REG_READCAPTURE_BYPASS_LSB 0 +#define CQSPI_REG_READCAPTURE_DELAY_LSB 1 +#define CQSPI_REG_READCAPTURE_DELAY_MASK 0xF + +#define CQSPI_REG_SIZE 0x14 +#define CQSPI_REG_SIZE_ADDRESS_LSB 0 +#define CQSPI_REG_SIZE_PAGE_LSB 4 +#define CQSPI_REG_SIZE_BLOCK_LSB 16 +#define CQSPI_REG_SIZE_ADDRESS_MASK 0xF +#define CQSPI_REG_SIZE_PAGE_MASK 0xFFF +#define CQSPI_REG_SIZE_BLOCK_MASK 0x3F + +#define CQSPI_REG_SRAMPARTITION 0x18 +#define CQSPI_REG_INDIRECTTRIGGER 0x1C + +#define CQSPI_REG_DMA 0x20 +#define CQSPI_REG_DMA_SINGLE_LSB 0 +#define CQSPI_REG_DMA_BURST_LSB 8 +#define CQSPI_REG_DMA_SINGLE_MASK 0xFF +#define CQSPI_REG_DMA_BURST_MASK 0xFF + +#define CQSPI_REG_REMAP 0x24 +#define CQSPI_REG_MODE_BIT 0x28 + +#define CQSPI_REG_SDRAMLEVEL 0x2C +#define CQSPI_REG_SDRAMLEVEL_RD_LSB 0 +#define CQSPI_REG_SDRAMLEVEL_WR_LSB 16 +#define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF +#define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF + +#define CQSPI_REG_IRQSTATUS 0x40 +#define CQSPI_REG_IRQMASK 0x44 + +#define CQSPI_REG_INDIRECTRD 0x60 +#define CQSPI_REG_INDIRECTRD_START_MASK BIT(0) +#define CQSPI_REG_INDIRECTRD_CANCEL_MASK BIT(1) +#define CQSPI_REG_INDIRECTRD_DONE_MASK BIT(5) + +#define CQSPI_REG_INDIRECTRDWATERMARK 0x64 +#define CQSPI_REG_INDIRECTRDSTARTADDR 0x68 +#define CQSPI_REG_INDIRECTRDBYTES 0x6C + +#define CQSPI_REG_CMDCTRL 0x90 +#define CQSPI_REG_CMDCTRL_EXECUTE_MASK BIT(0) +#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK BIT(1) +#define CQSPI_REG_CMDCTRL_WR_BYTES_LSB 12 +#define CQSPI_REG_CMDCTRL_WR_EN_LSB 15 +#define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB 16 +#define CQSPI_REG_CMDCTRL_ADDR_EN_LSB 19 +#define CQSPI_REG_CMDCTRL_RD_BYTES_LSB 20 +#define CQSPI_REG_CMDCTRL_RD_EN_LSB 23 +#define CQSPI_REG_CMDCTRL_OPCODE_LSB 24 +#define CQSPI_REG_CMDCTRL_WR_BYTES_MASK 0x7 +#define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK 0x3 +#define CQSPI_REG_CMDCTRL_RD_BYTES_MASK 0x7 + +#define CQSPI_REG_INDIRECTWR 0x70 +#define CQSPI_REG_INDIRECTWR_START_MASK BIT(0) +#define CQSPI_REG_INDIRECTWR_CANCEL_MASK BIT(1) +#define CQSPI_REG_INDIRECTWR_DONE_MASK BIT(5) + +#define CQSPI_REG_INDIRECTWRWATERMARK 0x74 +#define CQSPI_REG_INDIRECTWRSTARTADDR 0x78 +#define CQSPI_REG_INDIRECTWRBYTES 0x7C + +#define CQSPI_REG_CMDADDRESS 0x94 +#define CQSPI_REG_CMDREADDATALOWER 0xA0 +#define CQSPI_REG_CMDREADDATAUPPER 0xA4 +#define CQSPI_REG_CMDWRITEDATALOWER 0xA8 +#define CQSPI_REG_CMDWRITEDATAUPPER 0xAC + +/* Interrupt status bits */ +#define CQSPI_REG_IRQ_MODE_ERR BIT(0) +#define CQSPI_REG_IRQ_UNDERFLOW BIT(1) +#define CQSPI_REG_IRQ_IND_COMP BIT(2) +#define CQSPI_REG_IRQ_IND_RD_REJECT BIT(3) +#define CQSPI_REG_IRQ_WR_PROTECTED_ERR BIT(4) +#define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR BIT(5) +#define CQSPI_REG_IRQ_WATERMARK BIT(6) +#define CQSPI_REG_IRQ_IND_RD_OVERFLOW BIT(12) + +#define CQSPI_IRQ_STATUS_ERR (CQSPI_REG_IRQ_MODE_ERR | \ + CQSPI_REG_IRQ_IND_RD_REJECT | \ + CQSPI_REG_IRQ_WR_PROTECTED_ERR | \ + CQSPI_REG_IRQ_ILLEGAL_AHB_ERR) + +#define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_WATERMARK | \ + CQSPI_REG_IRQ_IND_RD_OVERFLOW | \ + CQSPI_REG_IRQ_IND_COMP) + +#define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_IND_COMP | \ + CQSPI_REG_IRQ_WATERMARK | \ + CQSPI_REG_IRQ_UNDERFLOW) + +#define CQSPI_IRQ_STATUS_MASK 0x1FFFF + +#define CQSPI_REG_IS_IDLE(base) \ + ((readl(base + CQSPI_REG_CONFIG) >> \ + CQSPI_REG_CONFIG_IDLE_LSB) & 0x1) + +#define CQSPI_GET_RD_SRAM_LEVEL(reg_base) \ + (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \ + CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK) + +static unsigned int cqspi_init_timeout(unsigned long timeout_in_ms) +{ + return jiffies + msecs_to_jiffies(timeout_in_ms); +} + +static unsigned int cqspi_check_timeout(unsigned long timeout) +{ + return time_before(jiffies, timeout); +} + +static void cqspi_fifo_read(void *dest, const void __iomem *src_ahb_addr, + unsigned int bytes) +{ + unsigned int temp; + int remaining = bytes; + unsigned int *dest_ptr = (unsigned int *)dest; + + while (remaining >= sizeof(dest_ptr)) { + *dest_ptr = readl(src_ahb_addr); + remaining -= sizeof(src_ahb_addr); + dest_ptr++; + } + if (remaining) { + /* dangling bytes */ + temp = readl(src_ahb_addr); + memcpy(dest_ptr, &temp, remaining); + } +} + +static void cqspi_fifo_write(struct cqspi_st *cqspi, + const void *src, unsigned int bytes) +{ + unsigned int temp = 0; + int i; + int remaining = bytes; + unsigned int __iomem *dest_ptr = + (unsigned int __iomem *)cqspi->ahb_base; + const unsigned int *src_ptr = (const unsigned int *)src; + + while (remaining >= cqspi->fifo_width) { + for (i = cqspi->fifo_width / sizeof(src_ptr) - 1; i >= 0; i--) + writel(*(src_ptr + i), dest_ptr + i); + src_ptr += cqspi->fifo_width / sizeof(src_ptr); + remaining -= cqspi->fifo_width; + } + if (remaining) { + /* dangling bytes */ + i = remaining / sizeof(dest_ptr); + memcpy(&temp, src_ptr + i, remaining % sizeof(dest_ptr)); + writel(temp, dest_ptr + i); + for (--i; i >= 0; i--) + writel(*(src_ptr + i), dest_ptr + i); + } +} + +static irqreturn_t cqspi_irq_handler(int this_irq, void *dev) +{ + struct cqspi_st *cqspi = dev; + unsigned int irq_status; + + /* Read interrupt status */ + irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS); + + /* Clear interrupt */ + writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS); + + if (irq_status & cqspi->irq_mask) + complete(&cqspi->transfer_complete); + + return IRQ_HANDLED; +} + +static int cqspi_find_chipselect(struct spi_nor *nor) +{ + int cs = -1; + struct cqspi_st *cqspi = nor->priv; + + for (cs = 0; cs < CQSPI_MAX_CHIPSELECT; cs++) + if (nor == &cqspi->f_pdata[cs].nor) + break; + return cs; +} + +static unsigned int cqspi_calc_rdreg(struct spi_nor *nor, u8 opcode) +{ + unsigned int rdreg = 0; + struct cqspi_st *cqspi = nor->priv; + struct cqspi_flash_pdata *f_pdata; + + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; + + if (nor->flash_read == SPI_NOR_QUAD) + rdreg |= (CQSPI_INST_TYPE_QUAD + << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB); + return rdreg; +} + +static unsigned int cqspi_wait_idle(struct cqspi_st *cqspi) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int count = 0; + unsigned timeout; + + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); + while (cqspi_check_timeout(timeout)) { + if (CQSPI_REG_IS_IDLE(reg_base)) { + /* + * Read few times in succession to ensure it does + * not transition low again + */ + count++; + if (count >= CQSPI_POLL_IDLE_RETRY) + return 1; + } else { + count = 0; + } + cpu_relax(); + } + + /* Timeout, in busy mode. */ + dev_err(&cqspi->pdev->dev, "QSPI is still busy after %dms timeout.\n", + CQSPI_TIMEOUT_MS); + return 0; +} + +static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int timeout; + + /* Write the CMDCTRL without start execution. */ + writel(reg, reg_base + CQSPI_REG_CMDCTRL); + /* Start execute */ + reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK; + writel(reg, reg_base + CQSPI_REG_CMDCTRL); + + /* Polling for completion. */ + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); + while (cqspi_check_timeout(timeout)) { + reg = readl(reg_base + CQSPI_REG_CMDCTRL) & + CQSPI_REG_CMDCTRL_INPROGRESS_MASK; + if (!reg) + break; + } + + if (reg != 0) { + dev_err(&cqspi->pdev->dev, "flash cmd execute time out\n"); + return -EIO; + } + + /* Polling QSPI idle status. */ + if (!cqspi_wait_idle(cqspi)) + return -EIO; + + return 0; +} + +static int cqspi_command_read(struct spi_nor *nor, + const u8 *txbuf, unsigned n_tx, + u8 *rxbuf, unsigned n_rx) +{ + unsigned int reg; + unsigned int read_len; + int status; + struct cqspi_st *cqspi = nor->priv; + void __iomem *reg_base = cqspi->iobase; + unsigned int rdreg; + + if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) { + dev_err(nor->dev, + "Invalid input argument, len %d rxbuf 0x%08x\n", n_rx, + (unsigned int)rxbuf); + return -EINVAL; + } + + reg = txbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB; + + rdreg = cqspi_calc_rdreg(nor, txbuf[0]); + writel(rdreg, reg_base + CQSPI_REG_RD_INSTR); + + reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB); + + /* 0 means 1 byte. */ + reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK) + << CQSPI_REG_CMDCTRL_RD_BYTES_LSB); + status = cqspi_exec_flash_cmd(cqspi, reg); + if (status != 0) + return status; + + reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER); + + /* Put the read value into rx_buf */ + read_len = (n_rx > 4) ? 4 : n_rx; + memcpy(rxbuf, ®, read_len); + rxbuf += read_len; + + if (n_rx > 4) { + reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER); + + read_len = n_rx - read_len; + memcpy(rxbuf, ®, read_len); + } + + return 0; +} + +static int cqspi_command_write(struct spi_nor *nor, + u8 opcode, const u8 *txbuf, unsigned n_tx) +{ + unsigned int reg; + unsigned int data; + int ret; + struct cqspi_st *cqspi = nor->priv; + void __iomem *reg_base = cqspi->iobase; + + if (n_tx > 4 || (n_tx && !txbuf)) { + dev_err(nor->dev, + "Invalid input argument, cmdlen %d txbuf 0x%08x\n", + n_tx, (unsigned int)txbuf); + return -EINVAL; + } + + reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; + if (n_tx) { + reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB); + reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK) + << CQSPI_REG_CMDCTRL_WR_BYTES_LSB; + data = 0; + memcpy(&data, txbuf, n_tx); + writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER); + } + + ret = cqspi_exec_flash_cmd(cqspi, reg); + return ret; +} + +static int cqspi_command_write_addr(struct spi_nor *nor, + u8 opcode, unsigned int addr) +{ + unsigned int reg; + struct cqspi_st *cqspi = nor->priv; + void __iomem *reg_base = cqspi->iobase; + + reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; + reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB); + reg |= ((nor->addr_width - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK) + << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB; + + writel(addr, reg_base + CQSPI_REG_CMDADDRESS); + + return cqspi_exec_flash_cmd(cqspi, reg); +} + +static int cqspi_indirect_read_setup(struct spi_nor *nor, + unsigned int from_addr) +{ + unsigned int reg; + unsigned int dummy_clk = 0; + struct cqspi_st *cqspi = nor->priv; + void __iomem *reg_base = cqspi->iobase; + + writel(cqspi->trigger_address, + reg_base + CQSPI_REG_INDIRECTTRIGGER); + writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR); + + reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB; + reg |= cqspi_calc_rdreg(nor, nor->read_opcode); + + /* Setup dummy clock cycles */ +#define CQSPI_SUPPORT_XIP_CHIPS +#ifdef CQSPI_SUPPORT_XIP_CHIPS + /* + * Set mode bits high to ensure chip doesn't enter XIP. + * This results in an extra 8 dummy clocks so + * we must account for them. + */ + writel(0xFF, reg_base + CQSPI_REG_MODE_BIT); + reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB); + if (nor->read_dummy >= 8) + dummy_clk = nor->read_dummy - 8; + else + dummy_clk = 0; +#else + dummy_clk = nor->read_dummy; +#endif + reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK) + << CQSPI_REG_RD_INSTR_DUMMY_LSB; + + writel(reg, reg_base + CQSPI_REG_RD_INSTR); + + /* Set address width */ + reg = readl(reg_base + CQSPI_REG_SIZE); + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; + reg |= (nor->addr_width - 1); + writel(reg, reg_base + CQSPI_REG_SIZE); + return 0; +} + +static int cqspi_indirect_read_execute(struct spi_nor *nor, + u8 *rxbuf, unsigned n_rx) +{ + int ret = 0; + unsigned int reg = 0; + unsigned int bytes_to_read = 0; + unsigned int timeout; + unsigned int watermark; + struct cqspi_st *cqspi = nor->priv; + void __iomem *reg_base = cqspi->iobase; + void __iomem *ahb_base = cqspi->ahb_base; + int remaining = (int)n_rx; + + watermark = cqspi->fifo_depth * cqspi->fifo_width / 2; + writel(watermark, reg_base + CQSPI_REG_INDIRECTRDWATERMARK); + writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES); + + /* Clear all interrupts. */ + writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); + + cqspi->irq_mask = CQSPI_IRQ_MASK_RD; + writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK); + + reinit_completion(&cqspi->transfer_complete); + writel(CQSPI_REG_INDIRECTRD_START_MASK, + reg_base + CQSPI_REG_INDIRECTRD); + + while (remaining > 0) { + ret = wait_for_completion_timeout(&cqspi->transfer_complete, + msecs_to_jiffies + (CQSPI_READ_TIMEOUT_MS)); + + bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base); + + if (!ret && bytes_to_read == 0) { + dev_err(nor->dev, "Indirect read timeout, no bytes\n"); + ret = -ETIMEDOUT; + goto failrd; + } + + while (bytes_to_read != 0) { + bytes_to_read *= cqspi->fifo_width; + bytes_to_read = bytes_to_read > remaining + ? remaining : bytes_to_read; + cqspi_fifo_read(rxbuf, ahb_base, bytes_to_read); + rxbuf += bytes_to_read; + remaining -= bytes_to_read; + bytes_to_read = CQSPI_GET_RD_SRAM_LEVEL(reg_base); + } + } + + /* Check indirect done status */ + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); + while (cqspi_check_timeout(timeout)) { + reg = readl(reg_base + CQSPI_REG_INDIRECTRD); + if (reg & CQSPI_REG_INDIRECTRD_DONE_MASK) + break; + } + + if (!(reg & CQSPI_REG_INDIRECTRD_DONE_MASK)) { + dev_err(nor->dev, + "Indirect read completion error 0x%08x\n", reg); + ret = -ETIMEDOUT; + goto failrd; + } + + /* Disable interrupt */ + writel(0, reg_base + CQSPI_REG_IRQMASK); + + /* Clear indirect completion status */ + writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + CQSPI_REG_INDIRECTRD); + + return 0; + + failrd: + /* Disable interrupt */ + writel(0, reg_base + CQSPI_REG_IRQMASK); + + /* Cancel the indirect read */ + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, + reg_base + CQSPI_REG_INDIRECTRD); + return ret; +} + +static int cqspi_indirect_write_setup(struct spi_nor *nor, unsigned int to_addr) +{ + unsigned int reg; + struct cqspi_st *cqspi = nor->priv; + void __iomem *reg_base = cqspi->iobase; + + /* Set opcode. */ + reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB; + writel(reg, reg_base + CQSPI_REG_WR_INSTR); + reg = cqspi_calc_rdreg(nor, nor->program_opcode); + writel(reg, reg_base + CQSPI_REG_RD_INSTR); + + writel(cqspi->trigger_address, + reg_base + CQSPI_REG_INDIRECTTRIGGER); + writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR); + + reg = readl(reg_base + CQSPI_REG_SIZE); + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; + reg |= (nor->addr_width - 1); + writel(reg, reg_base + CQSPI_REG_SIZE); + return 0; +} + +static int cqspi_indirect_write_execute(struct spi_nor *nor, + const u8 *txbuf, unsigned n_tx) +{ + int ret; + unsigned int timeout; + unsigned int reg = 0; + struct cqspi_st *cqspi = nor->priv; + void __iomem *reg_base = cqspi->iobase; + int remaining = (int)n_tx; + struct cqspi_flash_pdata *f_pdata; + unsigned int page_size; + unsigned int write_bytes; + + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; + page_size = nor->page_size; + + writel(CQSPI_REG_SRAM_THRESHOLD_BYTES, reg_base + + CQSPI_REG_INDIRECTWRWATERMARK); + writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES); + + /* Clear all interrupts. */ + writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); + + cqspi->irq_mask = CQSPI_IRQ_MASK_WR; + writel(cqspi->irq_mask, reg_base + CQSPI_REG_IRQMASK); + + reinit_completion(&cqspi->transfer_complete); + writel(CQSPI_REG_INDIRECTWR_START_MASK, + reg_base + CQSPI_REG_INDIRECTWR); + + /* Write a page or remaining bytes. */ + write_bytes = remaining > page_size ? page_size : remaining; + /* Fill up the data at the beginning */ + cqspi_fifo_write(cqspi, txbuf, write_bytes); + txbuf += write_bytes; + remaining -= write_bytes; + + while (remaining > 0) { + ret = wait_for_completion_timeout(&cqspi->transfer_complete, + msecs_to_jiffies + (CQSPI_TIMEOUT_MS)); + if (!ret) { + dev_err(nor->dev, "Indirect write timeout\n"); + ret = -ETIMEDOUT; + goto failwr; + } + + write_bytes = remaining > page_size ? page_size : remaining; + cqspi_fifo_write(cqspi, txbuf, write_bytes); + txbuf += write_bytes; + remaining -= write_bytes; + } + + ret = wait_for_completion_timeout(&cqspi->transfer_complete, + msecs_to_jiffies(CQSPI_TIMEOUT_MS)); + if (!ret) { + dev_err(nor->dev, "Indirect write timeout\n"); + ret = -ETIMEDOUT; + goto failwr; + } + + /* Check indirect done status */ + timeout = cqspi_init_timeout(CQSPI_TIMEOUT_MS); + while (cqspi_check_timeout(timeout)) { + reg = readl(reg_base + CQSPI_REG_INDIRECTWR); + if (reg & CQSPI_REG_INDIRECTWR_DONE_MASK) + break; + } + + if (!(reg & CQSPI_REG_INDIRECTWR_DONE_MASK)) { + dev_err(nor->dev, + "Indirect write completion error 0x%08x\n", reg); + ret = -ETIMEDOUT; + goto failwr; + } + + /* Disable interrupt. */ + writel(0, reg_base + CQSPI_REG_IRQMASK); + + /* Clear indirect completion status */ + writel(CQSPI_REG_INDIRECTWR_DONE_MASK, reg_base + CQSPI_REG_INDIRECTWR); + + cqspi_wait_idle(cqspi); + + return 0; + + failwr: + /* Disable interrupt. */ + writel(0, reg_base + CQSPI_REG_IRQMASK); + + /* Cancel the indirect write */ + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, + reg_base + CQSPI_REG_INDIRECTWR); + return ret; +} + +static void cqspi_write(struct spi_nor *nor, loff_t to, + size_t len, size_t *retlen, const u_char *buf) +{ + int ret; + + ret = cqspi_indirect_write_setup(nor, to); + if (ret == 0) { + ret = cqspi_indirect_write_execute(nor, buf, len); + if (ret == 0) + *retlen += len; + } +} + +static int cqspi_read(struct spi_nor *nor, loff_t from, + size_t len, size_t *retlen, u_char *buf) +{ + int ret; + + ret = cqspi_indirect_read_setup(nor, from); + if (ret == 0) { + ret = cqspi_indirect_read_execute(nor, buf, len); + if (ret == 0) + *retlen += len; + } + return ret; +} + +static int cqspi_erase(struct spi_nor *nor, loff_t offs) +{ + int ret; + + /* Send write enable, then erase commands. */ + ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0); + if (ret) + return ret; + + /* Set up command buffer. */ + ret = cqspi_command_write_addr(nor, nor->erase_opcode, offs); + if (ret) + return ret; + + return 0; +} + +static unsigned int calculate_ticks_for_ns(unsigned int ref_clk_hz, + unsigned int ns_val) +{ + unsigned int ticks; + + ticks = ref_clk_hz; + ticks /= 1000; + ticks *= ns_val; + ticks += 999999; + ticks /= 1000000; + return ticks; +} + +static void cqspi_delay(struct cqspi_st *cqspi, + unsigned int ref_clk_hz, unsigned int sclk_hz) +{ + void __iomem *iobase = cqspi->iobase; + struct cqspi_flash_pdata *f_pdata; + unsigned int tshsl, tchsh, tslch, tsd2d; + unsigned int reg; + unsigned int tsclk; + + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; + + /* calculate the number of ref ticks for one sclk tick */ + tsclk = (ref_clk_hz + sclk_hz - 1) / sclk_hz; + + tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns); + /* this particular value must be at least one sclk */ + if (tshsl < tsclk) + tshsl = tsclk; + + tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns); + tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns); + tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_ns); + + reg = ((tshsl & CQSPI_REG_DELAY_TSHSL_MASK) + << CQSPI_REG_DELAY_TSHSL_LSB); + reg |= ((tchsh & CQSPI_REG_DELAY_TCHSH_MASK) + << CQSPI_REG_DELAY_TCHSH_LSB); + reg |= ((tslch & CQSPI_REG_DELAY_TSLCH_MASK) + << CQSPI_REG_DELAY_TSLCH_LSB); + reg |= ((tsd2d & CQSPI_REG_DELAY_TSD2D_MASK) + << CQSPI_REG_DELAY_TSD2D_LSB); + writel(reg, iobase + CQSPI_REG_DELAY); +} + +static void cqspi_config_baudrate_div(struct cqspi_st *cqspi, + unsigned int ref_clk_hz, + unsigned int sclk_hz) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int reg; + unsigned int div; + + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB); + + div = ref_clk_hz / sclk_hz; + + /* Recalculate the baudrate divisor based on QSPI specification. */ + if (div > 32) + div = 32; + + /* Check if even number. */ + if (div & 1) + div = (div / 2); + else + div = (div / 2) - 1; + + div = (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB; + reg |= div; + writel(reg, reg_base + CQSPI_REG_CONFIG); +} + +static void cqspi_readdata_capture(struct cqspi_st *cqspi, + unsigned int bypass, unsigned int delay) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int reg; + + reg = readl(reg_base + CQSPI_REG_READCAPTURE); + + if (bypass) + reg |= (1 << CQSPI_REG_READCAPTURE_BYPASS_LSB); + else + reg &= ~(1 << CQSPI_REG_READCAPTURE_BYPASS_LSB); + + reg &= ~(CQSPI_REG_READCAPTURE_DELAY_MASK + << CQSPI_REG_READCAPTURE_DELAY_LSB); + + reg |= ((delay & CQSPI_REG_READCAPTURE_DELAY_MASK) + << CQSPI_REG_READCAPTURE_DELAY_LSB); + + writel(reg, reg_base + CQSPI_REG_READCAPTURE); +} + +static void cqspi_chipselect(struct cqspi_st *cqspi, + unsigned int chip_select, + unsigned int decoder_enable) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int reg; + + reg = readl(reg_base + CQSPI_REG_CONFIG); + if (decoder_enable) { + reg |= CQSPI_REG_CONFIG_DECODE_MASK; + } else { + reg &= ~CQSPI_REG_CONFIG_DECODE_MASK; + + /* Convert CS if without decoder. + * CS0 to 4b'1110 + * CS1 to 4b'1101 + * CS2 to 4b'1011 + * CS3 to 4b'0111 + */ + chip_select = 0xF & ~(1 << chip_select); + } + + reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK + << CQSPI_REG_CONFIG_CHIPSELECT_LSB); + reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK) + << CQSPI_REG_CONFIG_CHIPSELECT_LSB; + writel(reg, reg_base + CQSPI_REG_CONFIG); +} + +static void cqspi_controller_enable(struct cqspi_st *cqspi) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int reg; + + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg |= CQSPI_REG_CONFIG_ENABLE_MASK; + writel(reg, reg_base + CQSPI_REG_CONFIG); +} + +static void cqspi_controller_disable(struct cqspi_st *cqspi) +{ + void __iomem *reg_base = cqspi->iobase; + unsigned int reg; + + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK; + writel(reg, reg_base + CQSPI_REG_CONFIG); +} + +static void cqspi_switch_cs(struct cqspi_st *cqspi, unsigned int cs) +{ + unsigned int reg; + struct cqspi_flash_pdata *f_pdata = &cqspi->f_pdata[cs]; + void __iomem *iobase = cqspi->iobase; + struct spi_nor *nor = &f_pdata->nor; + + cqspi_controller_disable(cqspi); + + /* configure page size and block size. */ + reg = readl(iobase + CQSPI_REG_SIZE); + reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB); + reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB); + reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB); + reg |= (ilog2(nor->mtd->erasesize) << CQSPI_REG_SIZE_BLOCK_LSB); + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; + reg |= (nor->addr_width - 1); + writel(reg, iobase + CQSPI_REG_SIZE); + + /* configure the chip select */ + cqspi_chipselect(cqspi, cs, cqspi->is_decoded_cs); + + cqspi_controller_enable(cqspi); +} + +static int cqspi_prep(struct spi_nor *nor, enum spi_nor_ops ops) +{ + struct cqspi_st *cqspi = nor->priv; + int cs = cqspi_find_chipselect(nor); + struct cqspi_flash_pdata *f_pdata; + unsigned int sclk; + + /* Switch chip select. */ + if (cqspi->current_cs != cs) { + cqspi->current_cs = cs; + cqspi_switch_cs(cqspi, cs); + } + + /* Setup baudrate divisor and delays */ + f_pdata = &cqspi->f_pdata[cqspi->current_cs]; + sclk = f_pdata->clk_rate; + if (cqspi->sclk != sclk) { + cqspi->sclk = sclk; + cqspi_controller_disable(cqspi); + cqspi_config_baudrate_div(cqspi, + cqspi->master_ref_clk_hz, sclk); + cqspi_delay(cqspi, cqspi->master_ref_clk_hz, sclk); + cqspi_readdata_capture(cqspi, 1, f_pdata->read_delay); + cqspi_controller_enable(cqspi); + } + return 0; +} + +static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) +{ + int ret; + + cqspi_prep(nor, SPI_NOR_OPS_READ); + + ret = cqspi_command_read(nor, &opcode, 1, buf, len); + return ret; +} + +static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len, + int write_enable) +{ + int ret = 0; + + cqspi_prep(nor, SPI_NOR_OPS_WRITE); + + ret = cqspi_command_write(nor, opcode, buf, len); + return ret; +} + +static int cqspi_of_get_flash_pdata(struct platform_device *pdev, + struct cqspi_flash_pdata *f_pdata, + struct device_node *np) +{ + if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) { + dev_err(&pdev->dev, "couldn't determine read-delay\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) { + dev_err(&pdev->dev, "couldn't determine tshsl-ns\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) { + dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) { + dev_err(&pdev->dev, "couldn't determine tchsh-ns\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) { + dev_err(&pdev->dev, "couldn't determine tslch-ns\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) { + dev_err(&pdev->dev, "couldn't determine spi-max-frequency\n"); + return -ENXIO; + } + + return 0; +} + +static int cqspi_of_get_pdata(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct cqspi_st *cqspi = platform_get_drvdata(pdev); + + if (of_property_read_u32(np, "is-decoded-cs", &cqspi->is_decoded_cs)) + cqspi->is_decoded_cs = 0; + + if (of_property_read_u32(np, "fifo-depth", &cqspi->fifo_depth)) { + dev_err(&pdev->dev, "couldn't determine fifo-depth\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "fifo-width", &cqspi->fifo_width)) { + dev_err(&pdev->dev, "couldn't determine fifo-width\n"); + return -ENXIO; + } + + if (of_property_read_u32(np, "trigger-address", + &cqspi->trigger_address)) { + dev_err(&pdev->dev, "couldn't determine trigger-address\n"); + return -ENXIO; + } + + return 0; +} + +static void cqspi_controller_init(struct cqspi_st *cqspi) +{ + cqspi_controller_disable(cqspi); + + /* Configure the remap address register, no remap */ + writel(0, cqspi->iobase + CQSPI_REG_REMAP); + + /* Disable all interrupts. */ + writel(0, cqspi->iobase + CQSPI_REG_IRQMASK); + + /* Configure the SRAM split to 1:1 . */ + writel(cqspi->fifo_depth / 2, cqspi->iobase + CQSPI_REG_SRAMPARTITION); + + cqspi_controller_enable(cqspi); +} + +static int cqspi_remove(struct platform_device *pdev) +{ + struct cqspi_st *cqspi = platform_get_drvdata(pdev); + int i; + + cqspi_controller_disable(cqspi); + + for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++) + if (cqspi->f_pdata[i].mtd.name) + mtd_device_unregister(&cqspi->f_pdata[i].mtd); + + return 0; +} + +static int cqspi_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct mtd_part_parser_data ppdata; + struct device *dev = &pdev->dev; + struct cqspi_st *cqspi; + struct spi_nor *nor; + struct mtd_info *mtd; + struct resource *res; + struct resource *res_ahb; + int ret; + int irq; + + cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL); + if (!cqspi) + return -ENOMEM; + + cqspi->pdev = pdev; + platform_set_drvdata(pdev, cqspi); + + ret = cqspi_of_get_pdata(pdev); + if (ret) { + dev_err(dev, "Get platform data failed.\n"); + return -ENODEV; + } + + cqspi->clk = devm_clk_get(dev, NULL); + if (IS_ERR(cqspi->clk)) { + dev_err(dev, "cannot get qspi clk\n"); + ret = PTR_ERR(cqspi->clk); + goto probe_failed; + } + cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + cqspi->iobase = devm_ioremap_resource(dev, res); + if (IS_ERR(cqspi->iobase)) { + dev_err(dev, "devm_ioremap_resource res 0 failed\n"); + ret = PTR_ERR(cqspi->iobase); + goto probe_failed; + } + + res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1); + cqspi->ahb_phy_addr = res_ahb->start; + cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb); + if (IS_ERR(cqspi->ahb_base)) { + dev_err(dev, "devm_ioremap_resource res 1 failed\n"); + ret = PTR_ERR(cqspi->ahb_base); + goto probe_failed; + } + + init_completion(&cqspi->transfer_complete); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(dev, "platform_get_irq failed\n"); + ret = -ENXIO; + goto probe_failed; + } + ret = devm_request_irq(dev, irq, + cqspi_irq_handler, 0, pdev->name, cqspi); + if (ret) { + dev_err(dev, "devm_request_irq failed\n"); + goto probe_failed; + } + + cqspi_wait_idle(cqspi); + cqspi_controller_init(cqspi); + cqspi->current_cs = -1; + cqspi->sclk = 0; + + /* Get flash device data */ + for_each_available_child_of_node(dev->of_node, np) { + unsigned int cs; + struct cqspi_flash_pdata *f_pdata; + + if (of_property_read_u32(np, "reg", &cs)) { + dev_err(dev, "couldn't determine chip select\n"); + return -ENXIO; + } + if (cs >= CQSPI_MAX_CHIPSELECT) { + dev_err(dev, "chip select %d out of range\n", cs); + return -ENXIO; + } + f_pdata = &cqspi->f_pdata[cs]; + + ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np); + if (ret) + goto probe_failed; + + nor = &f_pdata->nor; + mtd = &f_pdata->mtd; + + nor->mtd = mtd; + nor->dev = dev; + nor->priv = cqspi; + mtd->priv = nor; + + nor->read_reg = cqspi_read_reg; + nor->write_reg = cqspi_write_reg; + nor->read = cqspi_read; + nor->write = cqspi_write; + nor->erase = cqspi_erase; + + nor->prepare = cqspi_prep; + + /* + * Here is a 'nasty hack' from Marek Vasut to pick + * up OF properties from flash device subnode. + */ + nor->dev->of_node = np; + + ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD); + if (ret) + goto probe_failed; + + if (nor->read_dummy > CQSPI_DUMMY_CLKS_MAX) + nor->read_dummy = CQSPI_DUMMY_CLKS_MAX; + + ppdata.of_node = np; + ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); + if (ret) + goto probe_failed; + } + + dev_info(dev, "Cadence QSPI NOR flash driver\n"); + return 0; + + probe_failed: + dev_err(dev, "Cadence QSPI NOR probe failed %d\n", ret); + cqspi_remove(pdev); + return ret; +} + +#ifdef CONFIG_PM_SLEEP +static int cqspi_suspend(struct device *dev) +{ + struct cqspi_st *cqspi = dev_get_drvdata(dev); + + cqspi_controller_disable(cqspi); + return 0; +} + +static int cqspi_resume(struct device *dev) +{ + struct cqspi_st *cqspi = dev_get_drvdata(dev); + + cqspi_controller_enable(cqspi); + return 0; +} + +static const struct dev_pm_ops cqspi__dev_pm_ops = { + .suspend = cqspi_suspend, + .resume = cqspi_resume, +}; + +#define CQSPI_DEV_PM_OPS (&cqspi__dev_pm_ops) +#else +#define CQSPI_DEV_PM_OPS NULL +#endif + +static struct of_device_id const cqspi_dt_ids[] = { + {.compatible = "cdns,qspi-nor",}, + { /* end of table */ } +}; + +MODULE_DEVICE_TABLE(of, cqspi_dt_ids); + +static struct platform_driver cqspi_platform_driver = { + .probe = cqspi_probe, + .remove = cqspi_remove, + .driver = { + .name = CQSPI_NAME, + .pm = CQSPI_DEV_PM_OPS, + .of_match_table = cqspi_dt_ids, + }, +}; + +module_platform_driver(cqspi_platform_driver); + +MODULE_DESCRIPTION("Cadence QSPI Controller Driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" CQSPI_NAME); +MODULE_AUTHOR("Ley Foon Tan <lftan@altera.com>"); +MODULE_AUTHOR("Graham Moore <grmoore@opensource.altera.com>");
Signed-off-by: Graham Moore <grmoore@opensource.altera.com> --- V2: use NULL instead of modalias in spi_nor_scan call V3: Use existing property is-decoded-cs instead of creating duplicate. V4: Support Micron quad mode by snooping command stream for EVCR command and subsequently configuring Cadence controller for quad mode. V5: Clean up sparse and smatch complaints. Remove snooping of Micron quad mode. Add comment on XIP mode bit and dummy clock cycles. Set up SRAM partition at 1:1 during init. V6: Remove dts patch that was included by mistake. Incorporate Vikas's comments regarding fifo width, SRAM partition setting, and trigger address. Trigger address was added as an unsigned int, as it is not an IO resource per se, and does not need to be mapped. Also add Marek Vasut's workaround for picking up OF properties on subnodes. --- drivers/mtd/spi-nor/Kconfig | 6 + drivers/mtd/spi-nor/Makefile | 1 + drivers/mtd/spi-nor/cadence-quadspi.c | 1276 +++++++++++++++++++++++++++++++++ 3 files changed, 1283 insertions(+) create mode 100644 drivers/mtd/spi-nor/cadence-quadspi.c