From patchwork Mon Jul 28 15:27:16 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Punnaiah Choudary Kalluri X-Patchwork-Id: 374246 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2001:1868:205::9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 445EB140174 for ; Tue, 29 Jul 2014 01:29:58 +1000 (EST) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XBmqV-0002dV-6v; Mon, 28 Jul 2014 15:28:15 +0000 Received: from mail-bn1lp0139.outbound.protection.outlook.com ([207.46.163.139] helo=na01-bn1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XBmqG-0002GB-Pr for linux-mtd@lists.infradead.org; Mon, 28 Jul 2014 15:28:03 +0000 Received: from BL2FFO11FD059.protection.gbl (10.173.160.33) by BL2FFO11HUB053.protection.gbl (10.173.161.153) with Microsoft SMTP Server (TLS) id 15.0.980.11; Mon, 28 Jul 2014 15:27:29 +0000 Received: from xsj-pvapsmtpgw01 (149.199.60.83) by BL2FFO11FD059.mail.protection.outlook.com (10.173.161.187) with Microsoft SMTP Server (TLS) id 15.0.980.11 via Frontend Transport; Mon, 28 Jul 2014 15:27:29 +0000 Received: from unknown-38-66.xilinx.com ([149.199.38.66] helo=xsj-smtp1) by xsj-pvapsmtpgw01 with esmtp (Exim 4.63) (envelope-from ) id 1XBmm7-0008EH-PE; Mon, 28 Jul 2014 08:23:43 -0700 From: Punnaiah Choudary Kalluri To: , , , , , , , , , , , , , , , , , , , Subject: [PATCH RFC v4 2/2] memory: pl353: Add driver for arm pl353 static memory controller Date: Mon, 28 Jul 2014 20:57:16 +0530 X-Mailer: git-send-email 1.7.4 In-Reply-To: <1406561236-29207-1-git-send-email-punnaia@xilinx.com> References: <1406561236-29207-1-git-send-email-punnaia@xilinx.com> X-RCIS-Action: ALLOW Message-ID: X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:149.199.60.83; CTRY:US; IPV:NLI; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(6009001)(438002)(189002)(199002)(50226001)(19580395003)(95666004)(76176999)(104166001)(80022001)(88136002)(92726001)(1496007)(76482001)(92566001)(47776003)(81542001)(31696002)(83322001)(4396001)(79102001)(85852003)(44976005)(77096002)(93916002)(229853001)(85306003)(74316001)(77156001)(106466001)(48376002)(19580405001)(99396002)(86362001)(62966002)(102836001)(21056001)(104016003)(20776003)(87286001)(50986999)(74502001)(87936001)(64706001)(74662001)(81342001)(50466002)(77982001)(6806004)(46102001)(83072002)(53416004)(107046002)(2201001)(31966008)(89996001)(70736001)(921003)(1121002)(107986001)(217873001)(2101003)(83996005); DIR:OUT; SFP:; SCL:1; SRVR:BL2FFO11HUB053; H:xsj-pvapsmtpgw01; FPR:; MLV:sfv; PTR:unknown-60-83.xilinx.com; MX:1; A:1; LANG:en; MIME-Version: 1.0 X-OriginatorOrg: xilinx.onmicrosoft.com X-Microsoft-Antispam: BCL:0;PCL:0;RULEID: X-Forefront-PRVS: 0286D7B531 Received-SPF: Pass (: domain of xilinx.com designates 149.199.60.83 as permitted sender) receiver=; client-ip=149.199.60.83; helo=xsj-pvapsmtpgw01; Authentication-Results: spf=pass (sender IP is 149.199.60.83) smtp.mailfrom=punnaiah.choudary.kalluri@xilinx.com; X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140728_082801_246424_293F48AD X-CRM114-Status: GOOD ( 19.07 ) X-Spam-Score: -0.7 (/) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [207.46.163.139 listed in list.dnswl.org] -0.7 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [207.46.163.139 listed in wl.mailspike.net] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record Cc: devicetree@vger.kernel.org, linux-doc@vger.kernel.org, svemula@xilinx.com, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, anirudh@xilinx.com, kalluripunnaiahchoudary@gmail.com, kpc528@gmail.com, Punnaiah Choudary Kalluri X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Add driver for arm pl353 static memory controller. This controller is used in xilinx zynq soc for interfacing the nand and nor/sram memory devices. Signed-off-by: Punnaiah Choudary Kalluri --- Changes in v4: - Modified driver to support multiple instances - Used sleep instaed of busywait for delay Changes in v3: - None Changes in v2: - Since now the timing parameters are in nano seconds, added logic to convert them to the cycles --- drivers/memory/Kconfig | 6 + drivers/memory/Makefile | 1 + drivers/memory/pl353-smc.c | 590 ++++++++++++++++++++++++++++++++++++++ include/linux/memory/pl353-smc.h | 34 +++ 4 files changed, 631 insertions(+), 0 deletions(-) create mode 100644 drivers/memory/pl353-smc.c create mode 100644 include/linux/memory/pl353-smc.h diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig index c59e9c9..58c29a2 100644 --- a/drivers/memory/Kconfig +++ b/drivers/memory/Kconfig @@ -65,4 +65,10 @@ config FSL_IFC bool depends on FSL_SOC +config PL353_SMC + bool "ARM PL353 Static Memory Controller(SMC) driver" + default y + depends on ARM + help + This driver is for the ARM PL353 Static Memory Controller(SMC) module. endif diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile index 71160a2..5040977 100644 --- a/drivers/memory/Makefile +++ b/drivers/memory/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_FSL_IFC) += fsl_ifc.o obj-$(CONFIG_MVEBU_DEVBUS) += mvebu-devbus.o obj-$(CONFIG_TEGRA20_MC) += tegra20-mc.o obj-$(CONFIG_TEGRA30_MC) += tegra30-mc.o +obj-$(CONFIG_PL353_SMC) += pl353-smc.o diff --git a/drivers/memory/pl353-smc.c b/drivers/memory/pl353-smc.c new file mode 100644 index 0000000..cb54b47 --- /dev/null +++ b/drivers/memory/pl353-smc.c @@ -0,0 +1,590 @@ +/* + * ARM PL353 SMC Driver + * + * Copyright (C) 2012 - 2014 Xilinx, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that 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. + * + * Currently only a single SMC instance is supported. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Register definitions */ +#define PL353_SMC_MEMC_STATUS_OFFS 0 /* Controller status reg, RO */ +#define PL353_SMC_CFG_CLR_OFFS 0xC /* Clear config reg, WO */ +#define PL353_SMC_DIRECT_CMD_OFFS 0x10 /* Direct command reg, WO */ +#define PL353_SMC_SET_CYCLES_OFFS 0x14 /* Set cycles register, WO */ +#define PL353_SMC_SET_OPMODE_OFFS 0x18 /* Set opmode register, WO */ +#define PL353_SMC_ECC_STATUS_OFFS 0x400 /* ECC status register */ +#define PL353_SMC_ECC_MEMCFG_OFFS 0x404 /* ECC mem config reg */ +#define PL353_SMC_ECC_MEMCMD1_OFFS 0x408 /* ECC mem cmd1 reg */ +#define PL353_SMC_ECC_MEMCMD2_OFFS 0x40C /* ECC mem cmd2 reg */ +#define PL353_SMC_ECC_VALUE0_OFFS 0x418 /* ECC value 0 reg */ + +/* Controller status register specifc constants */ +#define PL353_SMC_MEMC_STATUS_RAW_INT_1_SHIFT 6 + +/* Clear configuration register specific constants */ +#define PL353_SMC_CFG_CLR_INT_CLR_1 0x10 +#define PL353_SMC_CFG_CLR_ECC_INT_DIS_1 0x40 +#define PL353_SMC_CFG_CLR_INT_DIS_1 0x2 +#define PL353_SMC_CFG_CLR_DEFAULT_MASK (PL353_SMC_CFG_CLR_INT_CLR_1 | \ + PL353_SMC_CFG_CLR_ECC_INT_DIS_1 | \ + PL353_SMC_CFG_CLR_INT_DIS_1) + +/* Set cycles register specific constants */ +#define PL353_SMC_SET_CYCLES_T0_MASK 0xF +#define PL353_SMC_SET_CYCLES_T0_SHIFT 0 +#define PL353_SMC_SET_CYCLES_T1_MASK 0xF +#define PL353_SMC_SET_CYCLES_T1_SHIFT 4 +#define PL353_SMC_SET_CYCLES_T2_MASK 0x7 +#define PL353_SMC_SET_CYCLES_T2_SHIFT 8 +#define PL353_SMC_SET_CYCLES_T3_MASK 0x7 +#define PL353_SMC_SET_CYCLES_T3_SHIFT 11 +#define PL353_SMC_SET_CYCLES_T4_MASK 0x7 +#define PL353_SMC_SET_CYCLES_T4_SHIFT 14 +#define PL353_SMC_SET_CYCLES_T5_MASK 0x7 +#define PL353_SMC_SET_CYCLES_T5_SHIFT 17 +#define PL353_SMC_SET_CYCLES_T6_MASK 0xF +#define PL353_SMC_SET_CYCLES_T6_SHIFT 20 + +/* ECC status register specific constants */ +#define PL353_SMC_ECC_STATUS_BUSY (1 << 6) + +/* ECC memory config register specific constants */ +#define PL353_SMC_ECC_MEMCFG_MODE_MASK 0xC +#define PL353_SMC_ECC_MEMCFG_MODE_SHIFT 2 +#define PL353_SMC_ECC_MEMCFG_PGSIZE_MASK 0xC + +#define PL353_SMC_DC_UPT_NAND_REGS ((4 << 23) | /* CS: NAND chip */ \ + (2 << 21)) /* UpdateRegs operation */ + +#define PL353_NAND_ECC_CMD1 ((0x80) | /* Write command */ \ + (0 << 8) | /* Read command */ \ + (0x30 << 16) | /* Read End command */ \ + (1 << 24)) /* Read End command calid */ + +#define PL353_NAND_ECC_CMD2 ((0x85) | /* Write col change cmd */ \ + (5 << 8) | /* Read col change cmd */ \ + (0xE0 << 16) | /* Read col change end cmd */ \ + (1 << 24)) /* Read col change end cmd valid */ +#define PL353_NAND_ECC_BUSY_TIMEOUT (1 * HZ) +#define NS2CYCLE(clk, ns) (int)((ns) * ((clk) / 1000000) / 1000) + +/** + * struct pl353_smc_data - Private smc driver structure + * @base: SMC virtual register space + * @devclk: Pointer to the peripheral clock + * @aperclk: Pointer to the APER clock + */ +struct pl353_smc_data { + void __iomem *base; + struct clk *memclk; + struct clk *aclk; +}; + +/** + * pl353_smc_set_buswidth - Set memory buswidth + * @dev: Pointer to the device struct + * @bw: Memory buswidth (8 | 16) + * Return: 0 on success or negative errno. + */ +int pl353_smc_set_buswidth(struct device *dev, unsigned int bw) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + + if (bw != PL353_SMC_MEM_WIDTH_8 && bw != PL353_SMC_MEM_WIDTH_16) + return -EINVAL; + + writel(bw, pl353_smc->base + PL353_SMC_SET_OPMODE_OFFS); + writel(PL353_SMC_DC_UPT_NAND_REGS, pl353_smc->base + + PL353_SMC_DIRECT_CMD_OFFS); + + return 0; +} +EXPORT_SYMBOL_GPL(pl353_smc_set_buswidth); + +/** + * pl353_smc_set_cycles - Set memory timing parameters + * @dev: Pointer to the device struct + * @t0: t_rc read cycle time + * @t1: t_wc write cycle time + * @t2: t_rea/t_ceoe output enable assertion delay + * @t3: t_wp write enable deassertion delay + * @t4: t_clr/t_pc page cycle time + * @t5: t_ar/t_ta ID read time/turnaround time + * @t6: t_rr busy to RE timing + * + * Sets NAND chip specific timing parameters. + */ +static void pl353_smc_set_cycles(struct device *dev, u32 t0, u32 t1, u32 t2, + u32 t3, u32 t4, u32 t5, u32 t6) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + + t0 &= PL353_SMC_SET_CYCLES_T0_MASK; + t1 = (t1 & PL353_SMC_SET_CYCLES_T1_MASK) << + PL353_SMC_SET_CYCLES_T1_SHIFT; + t2 = (t2 & PL353_SMC_SET_CYCLES_T2_MASK) << + PL353_SMC_SET_CYCLES_T2_SHIFT; + t3 = (t3 & PL353_SMC_SET_CYCLES_T3_MASK) << + PL353_SMC_SET_CYCLES_T3_SHIFT; + t4 = (t4 & PL353_SMC_SET_CYCLES_T4_MASK) << + PL353_SMC_SET_CYCLES_T4_SHIFT; + t5 = (t5 & PL353_SMC_SET_CYCLES_T5_MASK) << + PL353_SMC_SET_CYCLES_T5_SHIFT; + t6 = (t6 & PL353_SMC_SET_CYCLES_T6_MASK) << + PL353_SMC_SET_CYCLES_T6_SHIFT; + + t0 |= t1 | t2 | t3 | t4 | t5 | t6; + + writel(t0, pl353_smc->base + PL353_SMC_SET_CYCLES_OFFS); + writel(PL353_SMC_DC_UPT_NAND_REGS, pl353_smc->base + + PL353_SMC_DIRECT_CMD_OFFS); +} + +/** + * pl353_smc_ecc_is_busy_noirq - Read ecc busy flag + * @dev: Pointer to the device struct + * Return: the ecc_status bit from the ecc_status register. 1 = busy, 0 = idle + */ +static int pl353_smc_ecc_is_busy_noirq(struct device *dev) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + + return !!(readl(pl353_smc->base + PL353_SMC_ECC_STATUS_OFFS) & + PL353_SMC_ECC_STATUS_BUSY); +} + +/** + * pl353_smc_ecc_is_busy - Read ecc busy flag + * @dev: Pointer to the device struct + * Return: the ecc_status bit from the ecc_status register. 1 = busy, 0 = idle + */ +int pl353_smc_ecc_is_busy(struct device *dev) +{ + int ret; + + ret = pl353_smc_ecc_is_busy_noirq(dev); + + return ret; +} +EXPORT_SYMBOL_GPL(pl353_smc_ecc_is_busy); + +/** + * pl353_smc_get_ecc_val - Read ecc_valueN registers + * @dev: Pointer to the device struct + * @ecc_reg: Index of the ecc_value reg (0..3) + * Return: the content of the requested ecc_value register. + * + * There are four valid ecc_value registers. The argument is truncated to stay + * within this valid boundary. + */ +u32 pl353_smc_get_ecc_val(struct device *dev, int ecc_reg) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + u32 addr, reg; + + ecc_reg &= 3; + addr = PL353_SMC_ECC_VALUE0_OFFS + (ecc_reg << 2); + reg = readl(pl353_smc->base + addr); + + return reg; +} +EXPORT_SYMBOL_GPL(pl353_smc_get_ecc_val); + +/** + * pl353_smc_get_nand_int_status_raw - Get NAND interrupt status bit + * @dev: Pointer to the device struct + * Return: the raw_int_status1 bit from the memc_status register + */ +int pl353_smc_get_nand_int_status_raw(struct device *dev) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + u32 reg; + + reg = readl(pl353_smc->base + PL353_SMC_MEMC_STATUS_OFFS); + reg >>= PL353_SMC_MEMC_STATUS_RAW_INT_1_SHIFT; + reg &= 1; + + return reg; +} +EXPORT_SYMBOL_GPL(pl353_smc_get_nand_int_status_raw); + +/** + * pl353_smc_clr_nand_int - Clear NAND interrupt + * @dev: Pointer to the device struct + */ +void pl353_smc_clr_nand_int(struct device *dev) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + + writel(PL353_SMC_CFG_CLR_INT_CLR_1, + pl353_smc->base + PL353_SMC_CFG_CLR_OFFS); +} +EXPORT_SYMBOL_GPL(pl353_smc_clr_nand_int); + +/** + * pl353_smc_set_ecc_mode - Set SMC ECC mode + * @dev: Pointer to the device struct + * @mode: ECC mode (BYPASS, APB, MEM) + * Return: 0 on success or negative errno. + */ +int pl353_smc_set_ecc_mode(struct device *dev, enum pl353_smc_ecc_mode mode) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + u32 reg; + int ret = 0; + + switch (mode) { + case PL353_SMC_ECCMODE_BYPASS: + case PL353_SMC_ECCMODE_APB: + case PL353_SMC_ECCMODE_MEM: + + reg = readl(pl353_smc->base + PL353_SMC_ECC_MEMCFG_OFFS); + reg &= ~PL353_SMC_ECC_MEMCFG_MODE_MASK; + reg |= mode << PL353_SMC_ECC_MEMCFG_MODE_SHIFT; + writel(reg, pl353_smc->base + PL353_SMC_ECC_MEMCFG_OFFS); + + break; + default: + ret = -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(pl353_smc_set_ecc_mode); + +/** + * pl353_smc_set_ecc_pg_size - Set SMC ECC page size + * @dev: Pointer to the device struct + * @pg_sz: ECC page size + * Return: 0 on success or negative errno. + */ +int pl353_smc_set_ecc_pg_size(struct device *dev, unsigned int pg_sz) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + u32 reg, sz; + + switch (pg_sz) { + case 0: + sz = 0; + break; + case 512: + sz = 1; + break; + case 1024: + sz = 2; + break; + case 2048: + sz = 3; + break; + default: + return -EINVAL; + } + + reg = readl(pl353_smc->base + PL353_SMC_ECC_MEMCFG_OFFS); + reg &= ~PL353_SMC_ECC_MEMCFG_PGSIZE_MASK; + reg |= sz; + writel(reg, pl353_smc->base + PL353_SMC_ECC_MEMCFG_OFFS); + + return 0; +} +EXPORT_SYMBOL_GPL(pl353_smc_set_ecc_pg_size); + +static int __maybe_unused pl353_smc_suspend(struct device *dev) +{ + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + + clk_disable(pl353_smc->memclk); + clk_disable(pl353_smc->aclk); + + return 0; +} + +static int __maybe_unused pl353_smc_resume(struct device *dev) +{ + int ret; + struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev); + + ret = clk_enable(pl353_smc->aclk); + if (ret) { + dev_err(dev, "Cannot enable axi domain clock.\n"); + return ret; + } + + ret = clk_enable(pl353_smc->memclk); + if (ret) { + dev_err(dev, "Cannot enable memory clock.\n"); + clk_disable(pl353_smc->aclk); + return ret; + } + return ret; +} + +static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend, + pl353_smc_resume); + +/** + * pl353_smc_init_nand_interface - Initialize the NAND interface + * @pdev: Pointer to the platform_device struct + * @nand_node: Pointer to the pl353_nand device_node struct + */ +static void pl353_smc_init_nand_interface(struct platform_device *pdev, + struct device_node *nand_node) +{ + u32 t_rc, t_wc, t_rea, t_wp, t_clr, t_ar, t_rr; + int err; + unsigned long timeout = jiffies + PL353_NAND_ECC_BUSY_TIMEOUT; + int clkrate; + struct pl353_smc_data *pl353_smc = platform_get_drvdata(pdev); + + clkrate = clk_get_rate(pl353_smc->memclk); + /* nand-cycle- property is refer to the NAND flash timing + * mapping between dts and the NAND flash AC timing + * X : AC timing name + * t0 : t_rc + * t1 : t_wc + * t2 : t_rea + * t3 : t_wp + * t4 : t_clr + * t5 : t_ar + * t6 : t_rr + */ + err = of_property_read_u32(nand_node, "nand-tRC-ns", &t_rc); + if (err) { + dev_warn(&pdev->dev, "nand,tRC-ns not in device tree"); + goto default_nand_timing; + } + t_rc = NS2CYCLE(clkrate, t_rc); + err = of_property_read_u32(nand_node, "nand-tWC-ns", &t_wc); + if (err) { + dev_warn(&pdev->dev, "nand,tWC-ns not in device tree"); + goto default_nand_timing; + } + t_wc = NS2CYCLE(clkrate, t_wc); + err = of_property_read_u32(nand_node, "nand-tREA-ns", &t_rea); + if (err) { + dev_warn(&pdev->dev, "nand,tREA-ns not in device tree"); + goto default_nand_timing; + } + t_rea = NS2CYCLE(clkrate, t_rea); + err = of_property_read_u32(nand_node, "nand-tWP-ns", &t_wp); + if (err) { + dev_warn(&pdev->dev, "nand,tWP-ns not in device tree"); + goto default_nand_timing; + } + t_wp = NS2CYCLE(clkrate, t_wp); + err = of_property_read_u32(nand_node, "nand-tCLR-ns", &t_clr); + if (err) { + dev_warn(&pdev->dev, "nand,tCLR-ns not in device tree"); + goto default_nand_timing; + } + t_clr = NS2CYCLE(clkrate, t_clr); + err = of_property_read_u32(nand_node, "nand-tAR-ns", &t_ar); + if (err) { + dev_warn(&pdev->dev, "nand,tAR-ns not in device tree"); + goto default_nand_timing; + } + t_ar = NS2CYCLE(clkrate, t_ar); + err = of_property_read_u32(nand_node, "nand-tRR-ns", &t_rr); + if (err) { + dev_warn(&pdev->dev, "arm,tRR-ns not in device tree"); + goto default_nand_timing; + } + t_rr = NS2CYCLE(clkrate, t_rr); + +default_nand_timing: + if (err) { + /* set default NAND flash timing property */ + dev_warn(&pdev->dev, "Using default timing for"); + dev_warn(&pdev->dev, "2Gb Numonyx MT29F2G08ABAEAWP NAND flash"); + dev_warn(&pdev->dev, "tWP, tCLR, tAR are set to 4"); + dev_warn(&pdev->dev, "tRC, tWC, tRR are set to 2"); + dev_warn(&pdev->dev, "tREA is set to 1"); + t_rc = t_wc = t_rr = 4; + t_rea = 1; + t_wp = t_clr = t_ar = 2; + } + + pl353_smc_set_buswidth(&pdev->dev, PL353_SMC_MEM_WIDTH_8); + + /* + * Default assume 50MHz clock (20ns cycle time) and 3V operation + * The SET_CYCLES_REG register value depends on the flash device. + * Look in to the device datasheet and change its value, This value + * is for 2Gb Numonyx flash. + */ + pl353_smc_set_cycles(&pdev->dev, t_rc, t_wc, t_rea, t_wp, t_clr, + t_ar, t_rr); + writel(PL353_SMC_CFG_CLR_INT_CLR_1, + pl353_smc->base + PL353_SMC_CFG_CLR_OFFS); + writel(PL353_SMC_DC_UPT_NAND_REGS, pl353_smc->base + + PL353_SMC_DIRECT_CMD_OFFS); + /* Wait till the ECC operation is complete */ + do { + if (pl353_smc_ecc_is_busy_noirq(&pdev->dev)) + msleep(1); + else + break; + } while (!time_after_eq(jiffies, timeout)); + + if (time_after_eq(jiffies, timeout)) + dev_err(&pdev->dev, "nand ecc busy status timed out"); + /* Set the command1 and command2 register */ + writel(PL353_NAND_ECC_CMD1, + pl353_smc->base + PL353_SMC_ECC_MEMCMD1_OFFS); + writel(PL353_NAND_ECC_CMD2, + pl353_smc->base + PL353_SMC_ECC_MEMCMD2_OFFS); +} + +static const struct of_device_id matches_nor[] = { + { .compatible = "cfi-flash" }, + {} +}; + +static const struct of_device_id matches_nand[] = { + { .compatible = "arm,pl353-nand-r2p1" }, + {} +}; + +static int pl353_smc_probe(struct platform_device *pdev) +{ + struct pl353_smc_data *pl353_smc; + struct device_node *child; + struct resource *res; + int err; + struct device_node *of_node = pdev->dev.of_node; + const struct of_device_id *matches = NULL; + + pl353_smc = devm_kzalloc(&pdev->dev, sizeof(*pl353_smc), GFP_KERNEL); + if (!pl353_smc) + return -ENOMEM; + + /* Get the NAND controller virtual address */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pl353_smc->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pl353_smc->base)) + return PTR_ERR(pl353_smc->base); + + pl353_smc->aclk = devm_clk_get(&pdev->dev, "aclk"); + if (IS_ERR(pl353_smc->aclk)) { + dev_err(&pdev->dev, "aclk clock not found.\n"); + return PTR_ERR(pl353_smc->aclk); + } + + pl353_smc->memclk = devm_clk_get(&pdev->dev, "memclk"); + if (IS_ERR(pl353_smc->memclk)) { + dev_err(&pdev->dev, "memclk clock not found.\n"); + return PTR_ERR(pl353_smc->memclk); + } + + err = clk_prepare_enable(pl353_smc->aclk); + if (err) { + dev_err(&pdev->dev, "Unable to enable AXI clock.\n"); + return err; + } + + err = clk_prepare_enable(pl353_smc->memclk); + if (err) { + dev_err(&pdev->dev, "Unable to enable memory clock.\n"); + goto out_clk_dis_aper; + } + + platform_set_drvdata(pdev, pl353_smc); + + /* clear interrupts */ + writel(PL353_SMC_CFG_CLR_DEFAULT_MASK, + pl353_smc->base + PL353_SMC_CFG_CLR_OFFS); + + /* Find compatible children. Only a single child is supported */ + for_each_available_child_of_node(of_node, child) { + if (of_match_node(matches_nand, child)) { + pl353_smc_init_nand_interface(pdev, child); + if (!matches) { + matches = matches_nand; + } else { + dev_err(&pdev->dev, + "incompatible configuration\n"); + goto out_clk_disable; + } + } + + if (of_match_node(matches_nor, child)) { + static int counts; + if (!matches) { + matches = matches_nor; + } else { + if (matches != matches_nor || counts > 1) { + dev_err(&pdev->dev, + "incompatible configuration\n"); + goto out_clk_disable; + } + } + counts++; + } + } + + if (matches) + of_platform_populate(of_node, matches, NULL, &pdev->dev); + + return 0; + +out_clk_disable: + clk_disable_unprepare(pl353_smc->memclk); +out_clk_dis_aper: + clk_disable_unprepare(pl353_smc->aclk); + + return err; +} + +static int pl353_smc_remove(struct platform_device *pdev) +{ + struct pl353_smc_data *pl353_smc = platform_get_drvdata(pdev); + + clk_disable_unprepare(pl353_smc->memclk); + clk_disable_unprepare(pl353_smc->aclk); + + return 0; +} + +/* Match table for device tree binding */ +static const struct of_device_id pl353_smc_of_match[] = { + { .compatible = "arm,pl353-smc-r2p1" }, + { }, +}; +MODULE_DEVICE_TABLE(of, pl353_smc_of_match); + +static struct platform_driver pl353_smc_driver = { + .probe = pl353_smc_probe, + .remove = pl353_smc_remove, + .driver = { + .name = "pl353-smc", + .owner = THIS_MODULE, + .pm = &pl353_smc_dev_pm_ops, + .of_match_table = pl353_smc_of_match, + }, +}; + +module_platform_driver(pl353_smc_driver); + +MODULE_AUTHOR("Xilinx, Inc."); +MODULE_DESCRIPTION("ARM PL353 SMC Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/memory/pl353-smc.h b/include/linux/memory/pl353-smc.h new file mode 100644 index 0000000..8e26d33 --- /dev/null +++ b/include/linux/memory/pl353-smc.h @@ -0,0 +1,34 @@ +/* + * ARM PL353 SMC Driver Header + * + * Copyright (C) 2012 Xilinx, Inc. + * + * This program is free software; you can redistribute it and/or modify it under + * the terms of the GNU General Public License version 2 as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#ifndef __LINUX_MEMORY_PL353_SMC_H +#define __LINUX_MEMORY_PL353_SMC_H + +enum pl353_smc_ecc_mode { + PL353_SMC_ECCMODE_BYPASS = 0, + PL353_SMC_ECCMODE_APB = 1, + PL353_SMC_ECCMODE_MEM = 2 +}; + +enum pl353_smc_mem_width { + PL353_SMC_MEM_WIDTH_8 = 0, + PL353_SMC_MEM_WIDTH_16 = 1 +}; + +u32 pl353_smc_get_ecc_val(struct device *dev, int ecc_reg); +int pl353_smc_ecc_is_busy(struct device *dev); +int pl353_smc_get_nand_int_status_raw(struct device *dev); +void pl353_smc_clr_nand_int(struct device *dev); +int pl353_smc_set_ecc_mode(struct device *dev, enum pl353_smc_ecc_mode mode); +int pl353_smc_set_ecc_pg_size(struct device *dev, unsigned int pg_sz); +int pl353_smc_set_buswidth(struct device *dev, unsigned int bw); + +#endif