diff options
Diffstat (limited to 'drivers/mtd/nand/nomadik_nand.c')
| -rw-r--r-- | drivers/mtd/nand/nomadik_nand.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nomadik_nand.c b/drivers/mtd/nand/nomadik_nand.c new file mode 100644 index 000000000000..7c302d55910e --- /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 © 2007 STMicroelectronics Pvt. Ltd. + * Author: Sachin Verma <sachin.verma@st.com> + * + * Copyright © 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"); |