Patchwork [V7] Nand driver for Nomadik 8815 SoC (on NHK8815 board)

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Submitter Alessandro Rubini
Date July 29, 2009, 4:51 p.m.
Message ID <20090729165156.GA1471@mail.gnudd.com>
Download mbox | patch
Permalink /patch/30352/
State New, archived
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Alessandro Rubini - July 29, 2009, 4:51 p.m.
From: Alessandro Rubini <rubini@unipv.it>


Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

The patch applies to rmk's devel tree.

Changes in V7:
	- removed unused static function
	- use linux/io.h not asm/io.h
	- untabbed a too-tabbed lined
	- remove wrong headers in commit message (I made a mess)

changes in V6:
        - blindly applied checkpatch suggestions (even if I disagree)
        - switched to pm_ops
        - declare soft ecc instead of hard

The last point makes the driver non-working unless the patch by Vimal Singh
at http://patchwork.ozlabs.org/patch/13697/ is applied.


 arch/arm/configs/nhk8815_defconfig        |    2 +-
 arch/arm/mach-nomadik/board-nhk8815.c     |   92 +++++++++++
 arch/arm/mach-nomadik/include/mach/fsmc.h |   29 ++++
 arch/arm/mach-nomadik/include/mach/nand.h |   16 ++
 drivers/mtd/nand/Kconfig                  |    6 +
 drivers/mtd/nand/Makefile                 |    1 +
 drivers/mtd/nand/nomadik_nand.c           |  250 +++++++++++++++++++++++++++++
 7 files changed, 395 insertions(+), 1 deletions(-)
 create mode 100644 arch/arm/mach-nomadik/include/mach/fsmc.h
 create mode 100644 arch/arm/mach-nomadik/include/mach/nand.h
 create mode 100644 drivers/mtd/nand/nomadik_nand.c
vimal singh - July 30, 2009, 5:15 a.m.
Acked-by: Vimal Singh <vimalsingh@ti.com>

-vimal

On Wed, Jul 29, 2009 at 10:21 PM, Alessandro
Rubini<rubini-list@gnudd.com> wrote:
> From: Alessandro Rubini <rubini@unipv.it>
>
>
> Signed-off-by: Alessandro Rubini <rubini@unipv.it>
> Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
> ---
>
> The patch applies to rmk's devel tree.
>
> Changes in V7:
>        - removed unused static function
>        - use linux/io.h not asm/io.h
>        - untabbed a too-tabbed lined
>        - remove wrong headers in commit message (I made a mess)
>
> changes in V6:
>        - blindly applied checkpatch suggestions (even if I disagree)
>        - switched to pm_ops
>        - declare soft ecc instead of hard
>
> The last point makes the driver non-working unless the patch by Vimal Singh
> at http://patchwork.ozlabs.org/patch/13697/ is applied.
>
>
>  arch/arm/configs/nhk8815_defconfig        |    2 +-
>  arch/arm/mach-nomadik/board-nhk8815.c     |   92 +++++++++++
>  arch/arm/mach-nomadik/include/mach/fsmc.h |   29 ++++
>  arch/arm/mach-nomadik/include/mach/nand.h |   16 ++
>  drivers/mtd/nand/Kconfig                  |    6 +
>  drivers/mtd/nand/Makefile                 |    1 +
>  drivers/mtd/nand/nomadik_nand.c           |  250 +++++++++++++++++++++++++++++
>  7 files changed, 395 insertions(+), 1 deletions(-)
>  create mode 100644 arch/arm/mach-nomadik/include/mach/fsmc.h
>  create mode 100644 arch/arm/mach-nomadik/include/mach/nand.h
>  create mode 100644 drivers/mtd/nand/nomadik_nand.c
>
> diff --git a/arch/arm/configs/nhk8815_defconfig b/arch/arm/configs/nhk8815_defconfig
> index 9bb45b9..600cb27 100644
> --- a/arch/arm/configs/nhk8815_defconfig
> +++ b/arch/arm/configs/nhk8815_defconfig
> @@ -498,7 +498,7 @@ CONFIG_MTD_CFI_I2=y
>  # CONFIG_MTD_DOC2001PLUS is not set
>  CONFIG_MTD_NAND=y
>  CONFIG_MTD_NAND_VERIFY_WRITE=y
> -# CONFIG_MTD_NAND_ECC_SMC is not set
> +CONFIG_MTD_NAND_ECC_SMC=y
>  # CONFIG_MTD_NAND_MUSEUM_IDS is not set
>  # CONFIG_MTD_NAND_GPIO is not set
>  CONFIG_MTD_NAND_IDS=y
> diff --git a/arch/arm/mach-nomadik/board-nhk8815.c b/arch/arm/mach-nomadik/board-nhk8815.c
> index 79bdea9..0924b19 100644
> --- a/arch/arm/mach-nomadik/board-nhk8815.c
> +++ b/arch/arm/mach-nomadik/board-nhk8815.c
> @@ -16,12 +16,103 @@
>  #include <linux/amba/bus.h>
>  #include <linux/interrupt.h>
>  #include <linux/gpio.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/mtd/nand.h>
> +#include <linux/mtd/partitions.h>
> +#include <linux/io.h>
> +#include <asm/sizes.h>
>  #include <asm/mach-types.h>
>  #include <asm/mach/arch.h>
>  #include <asm/mach/irq.h>
>  #include <mach/setup.h>
> +#include <mach/nand.h>
> +#include <mach/fsmc.h>
>  #include "clock.h"
>
> +/* These adresses span 16MB, so use three individual pages */
> +static struct resource nhk8815_nand_resources[] = {
> +       {
> +               .name = "nand_addr",
> +               .start = NAND_IO_ADDR,
> +               .end = NAND_IO_ADDR + 0xfff,
> +               .flags = IORESOURCE_MEM,
> +       }, {
> +               .name = "nand_cmd",
> +               .start = NAND_IO_CMD,
> +               .end = NAND_IO_CMD + 0xfff,
> +               .flags = IORESOURCE_MEM,
> +       }, {
> +               .name = "nand_data",
> +               .start = NAND_IO_DATA,
> +               .end = NAND_IO_DATA + 0xfff,
> +               .flags = IORESOURCE_MEM,
> +       }
> +};
> +
> +static int nhk8815_nand_init(void)
> +{
> +       /* FSMC setup for nand chip select (8-bit nand in 8815NHK) */
> +       writel(0x0000000E, FSMC_PCR(0));
> +       writel(0x000D0A00, FSMC_PMEM(0));
> +       writel(0x00100A00, FSMC_PATT(0));
> +
> +       /* enable access to the chip select area */
> +       writel(readl(FSMC_PCR(0)) | 0x04, FSMC_PCR(0));
> +
> +       return 0;
> +}
> +
> +/*
> + * These partitions are the same as those used in the 2.6.20 release
> + * shipped by the vendor; the first two partitions are mandated
> + * by the boot ROM, and the bootloader area is somehow oversized...
> + */
> +static struct mtd_partition nhk8815_partitions[] = {
> +       {
> +               .name   = "X-Loader(NAND)",
> +               .offset = 0,
> +               .size   = SZ_256K,
> +       }, {
> +               .name   = "MemInit(NAND)",
> +               .offset = MTDPART_OFS_APPEND,
> +               .size   = SZ_256K,
> +       }, {
> +               .name   = "BootLoader(NAND)",
> +               .offset = MTDPART_OFS_APPEND,
> +               .size   = SZ_2M,
> +       }, {
> +               .name   = "Kernel zImage(NAND)",
> +               .offset = MTDPART_OFS_APPEND,
> +               .size   = 3 * SZ_1M,
> +       }, {
> +               .name   = "Root Filesystem(NAND)",
> +               .offset = MTDPART_OFS_APPEND,
> +               .size   = 22 * SZ_1M,
> +       }, {
> +               .name   = "User Filesystem(NAND)",
> +               .offset = MTDPART_OFS_APPEND,
> +               .size   = MTDPART_SIZ_FULL,
> +       }
> +};
> +
> +static struct nomadik_nand_platform_data nhk8815_nand_data = {
> +       .parts          = nhk8815_partitions,
> +       .nparts         = ARRAY_SIZE(nhk8815_partitions),
> +       .options        = NAND_COPYBACK | NAND_CACHEPRG | NAND_NO_PADDING \
> +                       | NAND_NO_READRDY | NAND_NO_AUTOINCR,
> +       .init           = nhk8815_nand_init,
> +};
> +
> +static struct platform_device nhk8815_nand_device = {
> +       .name           = "nomadik_nand",
> +       .dev            = {
> +               .platform_data = &nhk8815_nand_data,
> +       },
> +       .resource       = nhk8815_nand_resources,
> +       .num_resources  = ARRAY_SIZE(nhk8815_nand_resources),
> +};
> +
> +
>  #define __MEM_4K_RESOURCE(x) \
>        .res = {.start = (x), .end = (x) + SZ_4K - 1, .flags = IORESOURCE_MEM}
>
> @@ -81,6 +172,7 @@ static int __init nhk8815_eth_init(void)
>  device_initcall(nhk8815_eth_init);
>
>  static struct platform_device *nhk8815_platform_devices[] __initdata = {
> +       &nhk8815_nand_device,
>        &nhk8815_eth_device,
>        /* will add more devices */
>  };
> diff --git a/arch/arm/mach-nomadik/include/mach/fsmc.h b/arch/arm/mach-nomadik/include/mach/fsmc.h
> new file mode 100644
> index 0000000..8c2c051
> --- /dev/null
> +++ b/arch/arm/mach-nomadik/include/mach/fsmc.h
> @@ -0,0 +1,29 @@
> +
> +/* Definitions for the Nomadik FSMC "Flexible Static Memory controller" */
> +
> +#ifndef __ASM_ARCH_FSMC_H
> +#define __ASM_ARCH_FSMC_H
> +
> +#include <mach/hardware.h>
> +/*
> + * Register list
> + */
> +
> +/* bus control reg. and bus timing reg. for CS0..CS3 */
> +#define FSMC_BCR(x)     (NOMADIK_FSMC_VA + (x << 3))
> +#define FSMC_BTR(x)     (NOMADIK_FSMC_VA + (x << 3) + 0x04)
> +
> +/* PC-card and NAND:
> + * PCR = control register
> + * PMEM = memory timing
> + * PATT = attribute timing
> + * PIO = I/O timing
> + * PECCR = ECC result
> + */
> +#define FSMC_PCR(x)     (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x00)
> +#define FSMC_PMEM(x)    (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x08)
> +#define FSMC_PATT(x)    (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x0c)
> +#define FSMC_PIO(x)     (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x10)
> +#define FSMC_PECCR(x)   (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x14)
> +
> +#endif /* __ASM_ARCH_FSMC_H */
> diff --git a/arch/arm/mach-nomadik/include/mach/nand.h b/arch/arm/mach-nomadik/include/mach/nand.h
> new file mode 100644
> index 0000000..c3c8254
> --- /dev/null
> +++ b/arch/arm/mach-nomadik/include/mach/nand.h
> @@ -0,0 +1,16 @@
> +#ifndef __ASM_ARCH_NAND_H
> +#define __ASM_ARCH_NAND_H
> +
> +struct nomadik_nand_platform_data {
> +       struct mtd_partition *parts;
> +       int nparts;
> +       int options;
> +       int (*init) (void);
> +       int (*exit) (void);
> +};
> +
> +#define NAND_IO_DATA   0x40000000
> +#define NAND_IO_CMD    0x40800000
> +#define NAND_IO_ADDR   0x41000000
> +
> +#endif                         /* __ASM_ARCH_NAND_H */
> diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
> index ce96c09..b9fa465 100644
> --- a/drivers/mtd/nand/Kconfig
> +++ b/drivers/mtd/nand/Kconfig
> @@ -426,6 +426,12 @@ config MTD_NAND_MXC
>          This enables the driver for the NAND flash controller on the
>          MXC processors.
>
> +config MTD_NAND_NOMADIK
> +       tristate "ST Nomadik 8815 NAND support"
> +       depends on ARCH_NOMADIK
> +       help
> +         Driver for the NAND flash controller on the Nomadik, with ECC.
> +
>  config MTD_NAND_SH_FLCTL
>        tristate "Support for NAND on Renesas SuperH FLCTL"
>        depends on MTD_NAND && SUPERH && CPU_SUBTYPE_SH7723
> diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
> index f3a786b..0fe9a0c 100644
> --- a/drivers/mtd/nand/Makefile
> +++ b/drivers/mtd/nand/Makefile
> @@ -40,5 +40,6 @@ obj-$(CONFIG_MTD_NAND_SH_FLCTL)               += sh_flctl.o
>  obj-$(CONFIG_MTD_NAND_MXC)             += mxc_nand.o
>  obj-$(CONFIG_MTD_NAND_SOCRATES)                += socrates_nand.o
>  obj-$(CONFIG_MTD_NAND_TXX9NDFMC)       += txx9ndfmc.o
> +obj-$(CONFIG_MTD_NAND_NOMADIK)         += nomadik_nand.o
>
>  nand-objs := nand_base.o nand_bbt.o
> diff --git a/drivers/mtd/nand/nomadik_nand.c b/drivers/mtd/nand/nomadik_nand.c
> new file mode 100644
> index 0000000..1946f6c
> --- /dev/null
> +++ b/drivers/mtd/nand/nomadik_nand.c
> @@ -0,0 +1,250 @@
> +/*
> + *  drivers/mtd/nand/nomadik_nand.c
> + *
> + *  Overview:
> + *     Driver for on-board NAND flash on Nomadik Platforms
> + *
> + * Copyright (C) 2007 STMicroelectronics Pvt. Ltd.
> + * Author: Sachin Verma <sachin.verma@st.com>
> + *
> + * Copyright (C) 2009 Alessandro Rubini
> + *
> + * 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.
> + *
> + */
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/types.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/mtd/nand.h>
> +#include <linux/mtd/nand_ecc.h>
> +#include <linux/platform_device.h>
> +#include <linux/mtd/partitions.h>
> +#include <linux/io.h>
> +#include <mach/nand.h>
> +#include <mach/fsmc.h>
> +
> +#include <mtd/mtd-abi.h>
> +
> +struct nomadik_nand_host {
> +       struct mtd_info         mtd;
> +       struct nand_chip        nand;
> +       void __iomem *data_va;
> +       void __iomem *cmd_va;
> +       void __iomem *addr_va;
> +       struct nand_bbt_descr *bbt_desc;
> +};
> +
> +static struct nand_ecclayout nomadik_ecc_layout = {
> +       .eccbytes = 3 * 4,
> +       .eccpos = { /* each subpage has 16 bytes: pos 2,3,4 hosts ECC */
> +               0x02, 0x03, 0x04,
> +               0x12, 0x13, 0x14,
> +               0x22, 0x23, 0x24,
> +               0x32, 0x33, 0x34},
> +       /* let's keep bytes 5,6,7 for us, just in case we change ECC algo */
> +       .oobfree = { {0x08, 0x08}, {0x18, 0x08}, {0x28, 0x08}, {0x38, 0x08} },
> +};
> +
> +static void nomadik_ecc_control(struct mtd_info *mtd, int mode)
> +{
> +       /* No need to enable hw ecc, it's on by default */
> +}
> +
> +static void nomadik_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
> +{
> +       struct nand_chip *nand = mtd->priv;
> +       struct nomadik_nand_host *host = nand->priv;
> +
> +       if (cmd == NAND_CMD_NONE)
> +               return;
> +
> +       if (ctrl & NAND_CLE)
> +               writeb(cmd, host->cmd_va);
> +       else
> +               writeb(cmd, host->addr_va);
> +}
> +
> +static int nomadik_nand_probe(struct platform_device *pdev)
> +{
> +       struct nomadik_nand_platform_data *pdata = pdev->dev.platform_data;
> +       struct nomadik_nand_host *host;
> +       struct mtd_info *mtd;
> +       struct nand_chip *nand;
> +       struct resource *res;
> +       int ret = 0;
> +
> +       /* Allocate memory for the device structure (and zero it) */
> +       host = kzalloc(sizeof(struct nomadik_nand_host), GFP_KERNEL);
> +       if (!host) {
> +               dev_err(&pdev->dev, "Failed to allocate device structure.\n");
> +               return -ENOMEM;
> +       }
> +
> +       /* Call the client's init function, if any */
> +       if (pdata->init)
> +               ret = pdata->init();
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "Init function failed\n");
> +               goto err;
> +       }
> +
> +       /* ioremap three regions */
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_addr");
> +       if (!res) {
> +               ret = -EIO;
> +               goto err_unmap;
> +       }
> +       host->addr_va = ioremap(res->start, res->end - res->start + 1);
> +
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
> +       if (!res) {
> +               ret = -EIO;
> +               goto err_unmap;
> +       }
> +       host->data_va = ioremap(res->start, res->end - res->start + 1);
> +
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_cmd");
> +       if (!res) {
> +               ret = -EIO;
> +               goto err_unmap;
> +       }
> +       host->cmd_va = ioremap(res->start, res->end - res->start + 1);
> +
> +       if (!host->addr_va || !host->data_va || !host->cmd_va) {
> +               ret = -ENOMEM;
> +               goto err_unmap;
> +       }
> +
> +       /* Link all private pointers */
> +       mtd = &host->mtd;
> +       nand = &host->nand;
> +       mtd->priv = nand;
> +       nand->priv = host;
> +
> +       host->mtd.owner = THIS_MODULE;
> +       nand->IO_ADDR_R = host->data_va;
> +       nand->IO_ADDR_W = host->data_va;
> +       nand->cmd_ctrl = nomadik_cmd_ctrl;
> +
> +       /*
> +        * This stanza declares ECC_HW but uses soft routines. It's because
> +        * HW claims to make the calculation but not the correction. However,
> +        * I haven't managed to get the desired data out of it until now.
> +        */
> +       nand->ecc.mode = NAND_ECC_SOFT;
> +       nand->ecc.layout = &nomadik_ecc_layout;
> +       nand->ecc.hwctl = nomadik_ecc_control;
> +       nand->ecc.size = 512;
> +       nand->ecc.bytes = 3;
> +
> +       nand->options = pdata->options;
> +
> +       /*
> +        * Scan to find existance of the device
> +        */
> +       if (nand_scan(&host->mtd, 1)) {
> +               ret = -ENXIO;
> +               goto err_unmap;
> +       }
> +
> +#ifdef CONFIG_MTD_PARTITIONS
> +       add_mtd_partitions(&host->mtd, pdata->parts, pdata->nparts);
> +#else
> +       pr_info("Registering %s as whole device\n", mtd->name);
> +       add_mtd_device(mtd);
> +#endif
> +
> +       platform_set_drvdata(pdev, host);
> +       return 0;
> +
> + err_unmap:
> +       if (host->cmd_va)
> +               iounmap(host->cmd_va);
> +       if (host->data_va)
> +               iounmap(host->data_va);
> +       if (host->addr_va)
> +               iounmap(host->addr_va);
> + err:
> +       kfree(host);
> +       return ret;
> +}
> +
> +/*
> + * Clean up routine
> + */
> +static int nomadik_nand_remove(struct platform_device *pdev)
> +{
> +       struct nomadik_nand_host *host = platform_get_drvdata(pdev);
> +       struct nomadik_nand_platform_data *pdata = pdev->dev.platform_data;
> +
> +       if (pdata->exit)
> +               pdata->exit();
> +
> +       if (host) {
> +               iounmap(host->cmd_va);
> +               iounmap(host->data_va);
> +               iounmap(host->addr_va);
> +               kfree(host);
> +       }
> +       return 0;
> +}
> +
> +static int nomadik_nand_suspend(struct device *dev)
> +{
> +       struct nomadik_nand_host *host = dev_get_drvdata(dev);
> +       int ret = 0;
> +       if (host)
> +               ret = host->mtd.suspend(&host->mtd);
> +       return ret;
> +}
> +
> +static int nomadik_nand_resume(struct device *dev)
> +{
> +       struct nomadik_nand_host *host = dev_get_drvdata(dev);
> +       if (host)
> +               host->mtd.resume(&host->mtd);
> +       return 0;
> +}
> +
> +static struct dev_pm_ops nomadik_nand_pm_ops = {
> +       .suspend = nomadik_nand_suspend,
> +       .resume = nomadik_nand_resume,
> +};
> +
> +static struct platform_driver nomadik_nand_driver = {
> +       .probe = nomadik_nand_probe,
> +       .remove = nomadik_nand_remove,
> +       .driver = {
> +               .owner = THIS_MODULE,
> +               .name = "nomadik_nand",
> +               .pm = &nomadik_nand_pm_ops,
> +       },
> +};
> +
> +static int __init nand_nomadik_init(void)
> +{
> +       pr_info("Nomadik NAND driver\n");
> +       return platform_driver_register(&nomadik_nand_driver);
> +}
> +
> +static void __exit nand_nomadik_exit(void)
> +{
> +       platform_driver_unregister(&nomadik_nand_driver);
> +}
> +
> +module_init(nand_nomadik_init);
> +module_exit(nand_nomadik_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("ST Microelectronics (sachin.verma@st.com)");
> +MODULE_DESCRIPTION("NAND driver for Nomadik Platform");
> --
> 1.6.0.2
>
Artem Bityutskiy - Aug. 9, 2009, 7:13 a.m.
On Wed, 2009-07-29 at 18:51 +0200, Alessandro Rubini wrote:
> From: Alessandro Rubini <rubini@unipv.it>
> 
> 
> Signed-off-by: Alessandro Rubini <rubini@unipv.it>
> Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
> ---
> 
> The patch applies to rmk's devel tree.
> 
> Changes in V7:
> 	- removed unused static function
> 	- use linux/io.h not asm/io.h
> 	- untabbed a too-tabbed lined
> 	- remove wrong headers in commit message (I made a mess)
> 
> changes in V6:
>         - blindly applied checkpatch suggestions (even if I disagree)
>         - switched to pm_ops
>         - declare soft ecc instead of hard
> 
> The last point makes the driver non-working unless the patch by Vimal Singh
> at http://patchwork.ozlabs.org/patch/13697/ is applied.
> 
> 
>  arch/arm/configs/nhk8815_defconfig        |    2 +-
>  arch/arm/mach-nomadik/board-nhk8815.c     |   92 +++++++++++
>  arch/arm/mach-nomadik/include/mach/fsmc.h |   29 ++++
>  arch/arm/mach-nomadik/include/mach/nand.h |   16 ++
>  drivers/mtd/nand/Kconfig                  |    6 +
>  drivers/mtd/nand/Makefile                 |    1 +
>  drivers/mtd/nand/nomadik_nand.c           |  250 +++++++++++++++++++++++++++++
>  7 files changed, 395 insertions(+), 1 deletions(-)
>  create mode 100644 arch/arm/mach-nomadik/include/mach/fsmc.h
>  create mode 100644 arch/arm/mach-nomadik/include/mach/nand.h
>  create mode 100644 drivers/mtd/nand/nomadik_nand.c

I wanted to put this to my l2-mtd-2.6.git tree, but the patch cannot be
applied because it does not seem to be a standalone patch, e.g.,
arch/arm/configs/nhk8815_defconfig does not exist in my tree.

So you should either split this better or have this merged via some ARM
tree with the rest of the patches.
Alessandro Rubini - Aug. 9, 2009, 9:07 a.m.
Artem Bityutskiy:
> I wanted to put this to my l2-mtd-2.6.git tree, but the patch cannot be
> applied because it does not seem to be a standalone patch, e.g.,
> arch/arm/configs/nhk8815_defconfig does not exist in my tree.

I think it's best for it to go through rmk, as it actually is a single
patch (platform data in one file, driver elsewhere and a config change
as otherwise it will miswork.  Splitting it for two maintainers would
break any future bisect if merges from the mtd and rmk won't be
applied in the right order.

thanks
/alessandro (offline since tomorrow, so I probably won't follow up again)

Patch

diff --git a/arch/arm/configs/nhk8815_defconfig b/arch/arm/configs/nhk8815_defconfig
index 9bb45b9..600cb27 100644
--- a/arch/arm/configs/nhk8815_defconfig
+++ b/arch/arm/configs/nhk8815_defconfig
@@ -498,7 +498,7 @@  CONFIG_MTD_CFI_I2=y
 # CONFIG_MTD_DOC2001PLUS is not set
 CONFIG_MTD_NAND=y
 CONFIG_MTD_NAND_VERIFY_WRITE=y
-# CONFIG_MTD_NAND_ECC_SMC is not set
+CONFIG_MTD_NAND_ECC_SMC=y
 # CONFIG_MTD_NAND_MUSEUM_IDS is not set
 # CONFIG_MTD_NAND_GPIO is not set
 CONFIG_MTD_NAND_IDS=y
diff --git a/arch/arm/mach-nomadik/board-nhk8815.c b/arch/arm/mach-nomadik/board-nhk8815.c
index 79bdea9..0924b19 100644
--- a/arch/arm/mach-nomadik/board-nhk8815.c
+++ b/arch/arm/mach-nomadik/board-nhk8815.c
@@ -16,12 +16,103 @@ 
 #include <linux/amba/bus.h>
 #include <linux/interrupt.h>
 #include <linux/gpio.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/io.h>
+#include <asm/sizes.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/irq.h>
 #include <mach/setup.h>
+#include <mach/nand.h>
+#include <mach/fsmc.h>
 #include "clock.h"
 
+/* These adresses span 16MB, so use three individual pages */
+static struct resource nhk8815_nand_resources[] = {
+	{
+		.name = "nand_addr",
+		.start = NAND_IO_ADDR,
+		.end = NAND_IO_ADDR + 0xfff,
+		.flags = IORESOURCE_MEM,
+	}, {
+		.name = "nand_cmd",
+		.start = NAND_IO_CMD,
+		.end = NAND_IO_CMD + 0xfff,
+		.flags = IORESOURCE_MEM,
+	}, {
+		.name = "nand_data",
+		.start = NAND_IO_DATA,
+		.end = NAND_IO_DATA + 0xfff,
+		.flags = IORESOURCE_MEM,
+	}
+};
+
+static int nhk8815_nand_init(void)
+{
+	/* FSMC setup for nand chip select (8-bit nand in 8815NHK) */
+	writel(0x0000000E, FSMC_PCR(0));
+	writel(0x000D0A00, FSMC_PMEM(0));
+	writel(0x00100A00, FSMC_PATT(0));
+
+	/* enable access to the chip select area */
+	writel(readl(FSMC_PCR(0)) | 0x04, FSMC_PCR(0));
+
+	return 0;
+}
+
+/*
+ * These partitions are the same as those used in the 2.6.20 release
+ * shipped by the vendor; the first two partitions are mandated
+ * by the boot ROM, and the bootloader area is somehow oversized...
+ */
+static struct mtd_partition nhk8815_partitions[] = {
+	{
+		.name	= "X-Loader(NAND)",
+		.offset = 0,
+		.size	= SZ_256K,
+	}, {
+		.name	= "MemInit(NAND)",
+		.offset	= MTDPART_OFS_APPEND,
+		.size	= SZ_256K,
+	}, {
+		.name	= "BootLoader(NAND)",
+		.offset	= MTDPART_OFS_APPEND,
+		.size	= SZ_2M,
+	}, {
+		.name	= "Kernel zImage(NAND)",
+		.offset	= MTDPART_OFS_APPEND,
+		.size	= 3 * SZ_1M,
+	}, {
+		.name	= "Root Filesystem(NAND)",
+		.offset	= MTDPART_OFS_APPEND,
+		.size	= 22 * SZ_1M,
+	}, {
+		.name	= "User Filesystem(NAND)",
+		.offset	= MTDPART_OFS_APPEND,
+		.size	= MTDPART_SIZ_FULL,
+	}
+};
+
+static struct nomadik_nand_platform_data nhk8815_nand_data = {
+	.parts		= nhk8815_partitions,
+	.nparts		= ARRAY_SIZE(nhk8815_partitions),
+	.options	= NAND_COPYBACK | NAND_CACHEPRG | NAND_NO_PADDING \
+			| NAND_NO_READRDY | NAND_NO_AUTOINCR,
+	.init		= nhk8815_nand_init,
+};
+
+static struct platform_device nhk8815_nand_device = {
+	.name		= "nomadik_nand",
+	.dev		= {
+		.platform_data = &nhk8815_nand_data,
+	},
+	.resource	= nhk8815_nand_resources,
+	.num_resources	= ARRAY_SIZE(nhk8815_nand_resources),
+};
+
+
 #define __MEM_4K_RESOURCE(x) \
 	.res = {.start = (x), .end = (x) + SZ_4K - 1, .flags = IORESOURCE_MEM}
 
@@ -81,6 +172,7 @@  static int __init nhk8815_eth_init(void)
 device_initcall(nhk8815_eth_init);
 
 static struct platform_device *nhk8815_platform_devices[] __initdata = {
+	&nhk8815_nand_device,
 	&nhk8815_eth_device,
 	/* will add more devices */
 };
diff --git a/arch/arm/mach-nomadik/include/mach/fsmc.h b/arch/arm/mach-nomadik/include/mach/fsmc.h
new file mode 100644
index 0000000..8c2c051
--- /dev/null
+++ b/arch/arm/mach-nomadik/include/mach/fsmc.h
@@ -0,0 +1,29 @@ 
+
+/* Definitions for the Nomadik FSMC "Flexible Static Memory controller" */
+
+#ifndef __ASM_ARCH_FSMC_H
+#define __ASM_ARCH_FSMC_H
+
+#include <mach/hardware.h>
+/*
+ * Register list
+ */
+
+/* bus control reg. and bus timing reg. for CS0..CS3 */
+#define FSMC_BCR(x)     (NOMADIK_FSMC_VA + (x << 3))
+#define FSMC_BTR(x)     (NOMADIK_FSMC_VA + (x << 3) + 0x04)
+
+/* PC-card and NAND:
+ * PCR = control register
+ * PMEM = memory timing
+ * PATT = attribute timing
+ * PIO = I/O timing
+ * PECCR = ECC result
+ */
+#define FSMC_PCR(x)     (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x00)
+#define FSMC_PMEM(x)    (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x08)
+#define FSMC_PATT(x)    (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x0c)
+#define FSMC_PIO(x)     (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x10)
+#define FSMC_PECCR(x)   (NOMADIK_FSMC_VA + ((2 + x) << 5) + 0x14)
+
+#endif /* __ASM_ARCH_FSMC_H */
diff --git a/arch/arm/mach-nomadik/include/mach/nand.h b/arch/arm/mach-nomadik/include/mach/nand.h
new file mode 100644
index 0000000..c3c8254
--- /dev/null
+++ b/arch/arm/mach-nomadik/include/mach/nand.h
@@ -0,0 +1,16 @@ 
+#ifndef __ASM_ARCH_NAND_H
+#define __ASM_ARCH_NAND_H
+
+struct nomadik_nand_platform_data {
+	struct mtd_partition *parts;
+	int nparts;
+	int options;
+	int (*init) (void);
+	int (*exit) (void);
+};
+
+#define NAND_IO_DATA	0x40000000
+#define NAND_IO_CMD	0x40800000
+#define NAND_IO_ADDR	0x41000000
+
+#endif				/* __ASM_ARCH_NAND_H */
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index ce96c09..b9fa465 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -426,6 +426,12 @@  config MTD_NAND_MXC
 	  This enables the driver for the NAND flash controller on the
 	  MXC processors.
 
+config MTD_NAND_NOMADIK
+	tristate "ST Nomadik 8815 NAND support"
+	depends on ARCH_NOMADIK
+	help
+	  Driver for the NAND flash controller on the Nomadik, with ECC.
+
 config MTD_NAND_SH_FLCTL
 	tristate "Support for NAND on Renesas SuperH FLCTL"
 	depends on MTD_NAND && SUPERH && CPU_SUBTYPE_SH7723
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index f3a786b..0fe9a0c 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -40,5 +40,6 @@  obj-$(CONFIG_MTD_NAND_SH_FLCTL)		+= sh_flctl.o
 obj-$(CONFIG_MTD_NAND_MXC)		+= mxc_nand.o
 obj-$(CONFIG_MTD_NAND_SOCRATES)		+= socrates_nand.o
 obj-$(CONFIG_MTD_NAND_TXX9NDFMC)	+= txx9ndfmc.o
+obj-$(CONFIG_MTD_NAND_NOMADIK)		+= nomadik_nand.o
 
 nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/nomadik_nand.c b/drivers/mtd/nand/nomadik_nand.c
new file mode 100644
index 0000000..1946f6c
--- /dev/null
+++ b/drivers/mtd/nand/nomadik_nand.c
@@ -0,0 +1,250 @@ 
+/*
+ *  drivers/mtd/nand/nomadik_nand.c
+ *
+ *  Overview:
+ *  	Driver for on-board NAND flash on Nomadik Platforms
+ *
+ * Copyright (C) 2007 STMicroelectronics Pvt. Ltd.
+ * Author: Sachin Verma <sachin.verma@st.com>
+ *
+ * Copyright (C) 2009 Alessandro Rubini
+ *
+ * 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.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/partitions.h>
+#include <linux/io.h>
+#include <mach/nand.h>
+#include <mach/fsmc.h>
+
+#include <mtd/mtd-abi.h>
+
+struct nomadik_nand_host {
+	struct mtd_info		mtd;
+	struct nand_chip	nand;
+	void __iomem *data_va;
+	void __iomem *cmd_va;
+	void __iomem *addr_va;
+	struct nand_bbt_descr *bbt_desc;
+};
+
+static struct nand_ecclayout nomadik_ecc_layout = {
+	.eccbytes = 3 * 4,
+	.eccpos = { /* each subpage has 16 bytes: pos 2,3,4 hosts ECC */
+		0x02, 0x03, 0x04,
+		0x12, 0x13, 0x14,
+		0x22, 0x23, 0x24,
+		0x32, 0x33, 0x34},
+	/* let's keep bytes 5,6,7 for us, just in case we change ECC algo */
+	.oobfree = { {0x08, 0x08}, {0x18, 0x08}, {0x28, 0x08}, {0x38, 0x08} },
+};
+
+static void nomadik_ecc_control(struct mtd_info *mtd, int mode)
+{
+	/* No need to enable hw ecc, it's on by default */
+}
+
+static void nomadik_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+	struct nand_chip *nand = mtd->priv;
+	struct nomadik_nand_host *host = nand->priv;
+
+	if (cmd == NAND_CMD_NONE)
+		return;
+
+	if (ctrl & NAND_CLE)
+		writeb(cmd, host->cmd_va);
+	else
+		writeb(cmd, host->addr_va);
+}
+
+static int nomadik_nand_probe(struct platform_device *pdev)
+{
+	struct nomadik_nand_platform_data *pdata = pdev->dev.platform_data;
+	struct nomadik_nand_host *host;
+	struct mtd_info *mtd;
+	struct nand_chip *nand;
+	struct resource *res;
+	int ret = 0;
+
+	/* Allocate memory for the device structure (and zero it) */
+	host = kzalloc(sizeof(struct nomadik_nand_host), GFP_KERNEL);
+	if (!host) {
+		dev_err(&pdev->dev, "Failed to allocate device structure.\n");
+		return -ENOMEM;
+	}
+
+	/* Call the client's init function, if any */
+	if (pdata->init)
+		ret = pdata->init();
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Init function failed\n");
+		goto err;
+	}
+
+	/* ioremap three regions */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_addr");
+	if (!res) {
+		ret = -EIO;
+		goto err_unmap;
+	}
+	host->addr_va = ioremap(res->start, res->end - res->start + 1);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
+	if (!res) {
+		ret = -EIO;
+		goto err_unmap;
+	}
+	host->data_va = ioremap(res->start, res->end - res->start + 1);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_cmd");
+	if (!res) {
+		ret = -EIO;
+		goto err_unmap;
+	}
+	host->cmd_va = ioremap(res->start, res->end - res->start + 1);
+
+	if (!host->addr_va || !host->data_va || !host->cmd_va) {
+		ret = -ENOMEM;
+		goto err_unmap;
+	}
+
+	/* Link all private pointers */
+	mtd = &host->mtd;
+	nand = &host->nand;
+	mtd->priv = nand;
+	nand->priv = host;
+
+	host->mtd.owner = THIS_MODULE;
+	nand->IO_ADDR_R = host->data_va;
+	nand->IO_ADDR_W = host->data_va;
+	nand->cmd_ctrl = nomadik_cmd_ctrl;
+
+	/*
+	 * This stanza declares ECC_HW but uses soft routines. It's because
+	 * HW claims to make the calculation but not the correction. However,
+	 * I haven't managed to get the desired data out of it until now.
+	 */
+	nand->ecc.mode = NAND_ECC_SOFT;
+	nand->ecc.layout = &nomadik_ecc_layout;
+	nand->ecc.hwctl = nomadik_ecc_control;
+	nand->ecc.size = 512;
+	nand->ecc.bytes = 3;
+
+	nand->options = pdata->options;
+
+	/*
+	 * Scan to find existance of the device
+	 */
+	if (nand_scan(&host->mtd, 1)) {
+		ret = -ENXIO;
+		goto err_unmap;
+	}
+
+#ifdef CONFIG_MTD_PARTITIONS
+	add_mtd_partitions(&host->mtd, pdata->parts, pdata->nparts);
+#else
+	pr_info("Registering %s as whole device\n", mtd->name);
+	add_mtd_device(mtd);
+#endif
+
+	platform_set_drvdata(pdev, host);
+	return 0;
+
+ err_unmap:
+	if (host->cmd_va)
+		iounmap(host->cmd_va);
+	if (host->data_va)
+		iounmap(host->data_va);
+	if (host->addr_va)
+		iounmap(host->addr_va);
+ err:
+	kfree(host);
+	return ret;
+}
+
+/*
+ * Clean up routine
+ */
+static int nomadik_nand_remove(struct platform_device *pdev)
+{
+	struct nomadik_nand_host *host = platform_get_drvdata(pdev);
+	struct nomadik_nand_platform_data *pdata = pdev->dev.platform_data;
+
+	if (pdata->exit)
+		pdata->exit();
+
+	if (host) {
+		iounmap(host->cmd_va);
+		iounmap(host->data_va);
+		iounmap(host->addr_va);
+		kfree(host);
+	}
+	return 0;
+}
+
+static int nomadik_nand_suspend(struct device *dev)
+{
+	struct nomadik_nand_host *host = dev_get_drvdata(dev);
+	int ret = 0;
+	if (host)
+		ret = host->mtd.suspend(&host->mtd);
+	return ret;
+}
+
+static int nomadik_nand_resume(struct device *dev)
+{
+	struct nomadik_nand_host *host = dev_get_drvdata(dev);
+	if (host)
+		host->mtd.resume(&host->mtd);
+	return 0;
+}
+
+static struct dev_pm_ops nomadik_nand_pm_ops = {
+	.suspend = nomadik_nand_suspend,
+	.resume = nomadik_nand_resume,
+};
+
+static struct platform_driver nomadik_nand_driver = {
+	.probe = nomadik_nand_probe,
+	.remove = nomadik_nand_remove,
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "nomadik_nand",
+		.pm = &nomadik_nand_pm_ops,
+	},
+};
+
+static int __init nand_nomadik_init(void)
+{
+	pr_info("Nomadik NAND driver\n");
+	return platform_driver_register(&nomadik_nand_driver);
+}
+
+static void __exit nand_nomadik_exit(void)
+{
+	platform_driver_unregister(&nomadik_nand_driver);
+}
+
+module_init(nand_nomadik_init);
+module_exit(nand_nomadik_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("ST Microelectronics (sachin.verma@st.com)");
+MODULE_DESCRIPTION("NAND driver for Nomadik Platform");