diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/mtd/nand/Kconfig | 7 | ||||
-rw-r--r-- | drivers/mtd/nand/s3c2410.c | 180 |
2 files changed, 152 insertions, 35 deletions
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index f7801eb730ce..94b1d0e3ec85 100644 --- a/drivers/mtd/nand/Kconfig +++ b/drivers/mtd/nand/Kconfig @@ -1,5 +1,5 @@ # drivers/mtd/nand/Kconfig -# $Id: Kconfig,v 1.26 2005/01/05 12:42:24 dwmw2 Exp $ +# $Id: Kconfig,v 1.31 2005/06/20 12:03:21 bjd Exp $ menu "NAND Flash Device Drivers" depends on MTD!=n @@ -95,10 +95,11 @@ config MTD_NAND_PPCHAMELEONEVB This enables the NAND flash driver on the PPChameleon EVB Board. config MTD_NAND_S3C2410 - tristate "NAND Flash support for S3C2410 SoC" + tristate "NAND Flash support for S3C2410/S3C2440 SoC" depends on ARCH_S3C2410 && MTD_NAND help - This enables the NAND flash controller on the S3C2410. + This enables the NAND flash controller on the S3C2410 and S3C2440 + SoCs No board specfic support is done by this driver, each board must advertise a platform_device for the driver to attach. diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 64b1d95e3e37..630a9c0edf31 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -1,10 +1,10 @@ /* linux/drivers/mtd/nand/s3c2410.c * - * Copyright (c) 2004 Simtec Electronics + * Copyright (c) 2004,2005 Simtec Electronics * http://www.simtec.co.uk/products/SWLINUX/ * Ben Dooks <ben@simtec.co.uk> * - * Samsung S3C2410 NAND driver + * Samsung S3C2410/S3C240 NAND driver * * Changelog: * 21-Sep-2004 BJD Initial version @@ -13,8 +13,11 @@ * 12-Oct-2004 BJD Fixed errors in use of platform data * 18-Feb-2005 BJD Fix sparse errors * 14-Mar-2005 BJD Applied tglx's code reduction patch + * 02-May-2005 BJD Fixed s3c2440 support + * 02-May-2005 BJD Reduced hwcontrol decode + * 20-Jun-2005 BJD Updated s3c2440 support, fixed timing bug * - * $Id: s3c2410.c,v 1.12 2005/03/17 11:31:26 bjd Exp $ + * $Id: s3c2410.c,v 1.13 2005/06/20 11:48:21 bjd Exp $ * * 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 @@ -104,6 +107,8 @@ struct s3c2410_nand_info { struct clk *clk; void __iomem *regs; int mtd_count; + + unsigned char is_s3c2440; }; /* conversion functions */ @@ -168,12 +173,12 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info, /* calculate the timing information for the controller */ if (plat != NULL) { - tacls = s3c2410_nand_calc_rate(plat->tacls, clkrate, 8); + tacls = s3c2410_nand_calc_rate(plat->tacls, clkrate, 4); twrph0 = s3c2410_nand_calc_rate(plat->twrph0, clkrate, 8); twrph1 = s3c2410_nand_calc_rate(plat->twrph1, clkrate, 8); } else { /* default timings */ - tacls = 8; + tacls = 4; twrph0 = 8; twrph1 = 8; } @@ -188,10 +193,16 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info, to_ns(twrph0, clkrate), to_ns(twrph1, clkrate)); - cfg = S3C2410_NFCONF_EN; - cfg |= S3C2410_NFCONF_TACLS(tacls-1); - cfg |= S3C2410_NFCONF_TWRPH0(twrph0-1); - cfg |= S3C2410_NFCONF_TWRPH1(twrph1-1); + if (!info->is_s3c2440) { + cfg = S3C2410_NFCONF_EN; + cfg |= S3C2410_NFCONF_TACLS(tacls-1); + cfg |= S3C2410_NFCONF_TWRPH0(twrph0-1); + cfg |= S3C2410_NFCONF_TWRPH1(twrph1-1); + } else { + cfg = S3C2440_NFCONF_TACLS(tacls-1); + cfg |= S3C2440_NFCONF_TWRPH0(twrph0-1); + cfg |= S3C2440_NFCONF_TWRPH1(twrph1-1); + } pr_debug(PFX "NF_CONF is 0x%lx\n", cfg); @@ -206,15 +217,20 @@ static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip) struct s3c2410_nand_info *info; struct s3c2410_nand_mtd *nmtd; struct nand_chip *this = mtd->priv; + void __iomem *reg; unsigned long cur; + unsigned long bit; nmtd = this->priv; info = nmtd->info; - cur = readl(info->regs + S3C2410_NFCONF); + bit = (info->is_s3c2440) ? S3C2440_NFCONT_nFCE : S3C2410_NFCONF_nFCE; + reg = info->regs+((info->is_s3c2440) ? S3C2440_NFCONT:S3C2410_NFCONF); + + cur = readl(reg); if (chip == -1) { - cur |= S3C2410_NFCONF_nFCE; + cur |= bit; } else { if (chip > nmtd->set->nr_chips) { printk(KERN_ERR PFX "chip %d out of range\n", chip); @@ -226,45 +242,72 @@ static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip) (info->platform->select_chip)(nmtd->set, chip); } - cur &= ~S3C2410_NFCONF_nFCE; + cur &= ~bit; } - writel(cur, info->regs + S3C2410_NFCONF); + writel(cur, reg); } -/* command and control functions */ +/* command and control functions + * + * Note, these all use tglx's method of changing the IO_ADDR_W field + * to make the code simpler, and use the nand layer's code to issue the + * command and address sequences via the proper IO ports. + * +*/ static void s3c2410_nand_hwcontrol(struct mtd_info *mtd, int cmd) { struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); struct nand_chip *chip = mtd->priv; - unsigned long cur; switch (cmd) { case NAND_CTL_SETNCE: - cur = readl(info->regs + S3C2410_NFCONF); - cur &= ~S3C2410_NFCONF_nFCE; - writel(cur, info->regs + S3C2410_NFCONF); + case NAND_CTL_CLRNCE: + printk(KERN_ERR "%s: called for NCE\n", __FUNCTION__); + break; + + case NAND_CTL_SETCLE: + chip->IO_ADDR_W = info->regs + S3C2410_NFCMD; + break; + + case NAND_CTL_SETALE: + chip->IO_ADDR_W = info->regs + S3C2410_NFADDR; + break; + + /* NAND_CTL_CLRCLE: */ + /* NAND_CTL_CLRALE: */ + default: + chip->IO_ADDR_W = info->regs + S3C2410_NFDATA; break; + } +} + +/* command and control functions */ + +static void s3c2440_nand_hwcontrol(struct mtd_info *mtd, int cmd) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + struct nand_chip *chip = mtd->priv; + switch (cmd) { + case NAND_CTL_SETNCE: case NAND_CTL_CLRNCE: - cur = readl(info->regs + S3C2410_NFCONF); - cur |= S3C2410_NFCONF_nFCE; - writel(cur, info->regs + S3C2410_NFCONF); + printk(KERN_ERR "%s: called for NCE\n", __FUNCTION__); break; case NAND_CTL_SETCLE: - chip->IO_ADDR_W = info->regs + S3C2410_NFCMD; + chip->IO_ADDR_W = info->regs + S3C2440_NFCMD; break; case NAND_CTL_SETALE: - chip->IO_ADDR_W = info->regs + S3C2410_NFADDR; + chip->IO_ADDR_W = info->regs + S3C2440_NFADDR; break; /* NAND_CTL_CLRCLE: */ /* NAND_CTL_CLRALE: */ default: - chip->IO_ADDR_W = info->regs + S3C2410_NFDATA; + chip->IO_ADDR_W = info->regs + S3C2440_NFDATA; break; } } @@ -278,9 +321,12 @@ static int s3c2410_nand_devready(struct mtd_info *mtd) { struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + if (info->is_s3c2440) + return readb(info->regs + S3C2440_NFSTAT) & S3C2440_NFSTAT_READY; return readb(info->regs + S3C2410_NFSTAT) & S3C2410_NFSTAT_BUSY; } + /* ECC handling functions */ static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat, @@ -303,6 +349,12 @@ static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat, return -1; } +/* ECC functions + * + * These allow the s3c2410 and s3c2440 to use the controller's ECC + * generator block to ECC the data as it passes through] +*/ + static void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode) { struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); @@ -313,6 +365,15 @@ static void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode) writel(ctrl, info->regs + S3C2410_NFCONF); } +static void s3c2440_nand_enable_hwecc(struct mtd_info *mtd, int mode) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + unsigned long ctrl; + + ctrl = readl(info->regs + S3C2440_NFCONT); + writel(ctrl | S3C2440_NFCONT_INITECC, info->regs + S3C2440_NFCONT); +} + static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code) { @@ -329,7 +390,26 @@ static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, } -/* over-ride the standard functions for a little more speed? */ +static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, + const u_char *dat, u_char *ecc_code) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + unsigned long ecc = readl(info->regs + S3C2440_NFMECC0); + + ecc_code[0] = ecc; + ecc_code[1] = ecc >> 8; + ecc_code[2] = ecc >> 16; + + pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n", + ecc_code[0], ecc_code[1], ecc_code[2]); + + return 0; +} + + +/* over-ride the standard functions for a little more speed. We can + * use read/write block to move the data buffers to/from the controller +*/ static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) { @@ -444,6 +524,12 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, chip->options = 0; chip->controller = &info->controller; + if (info->is_s3c2440) { + chip->IO_ADDR_R = info->regs + S3C2440_NFDATA; + chip->IO_ADDR_W = info->regs + S3C2440_NFDATA; + chip->hwcontrol = s3c2440_nand_hwcontrol; + } + nmtd->info = info; nmtd->mtd.priv = chip; nmtd->set = set; @@ -454,6 +540,11 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, chip->calculate_ecc = s3c2410_nand_calculate_ecc; chip->eccmode = NAND_ECC_HW3_512; chip->autooob = &nand_hw_eccoob; + + if (info->is_s3c2440) { + chip->enable_hwecc = s3c2440_nand_enable_hwecc; + chip->calculate_ecc = s3c2440_nand_calculate_ecc; + } } else { chip->eccmode = NAND_ECC_SOFT; } @@ -467,7 +558,7 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, * nand layer to look for devices */ -static int s3c2410_nand_probe(struct device *dev) +static int s3c24xx_nand_probe(struct device *dev, int is_s3c2440) { struct platform_device *pdev = to_platform_device(dev); struct s3c2410_platform_nand *plat = to_nand_plat(dev); @@ -493,6 +584,7 @@ static int s3c2410_nand_probe(struct device *dev) dev_set_drvdata(dev, info); spin_lock_init(&info->controller.lock); + init_waitqueue_head(&info->controller.wq); /* get the clock source and enable it */ @@ -508,7 +600,8 @@ static int s3c2410_nand_probe(struct device *dev) /* allocate and map the resource */ - res = pdev->resource; /* assume that the flash has one resource */ + /* currently we assume we have the one resource */ + res = pdev->resource; size = res->end - res->start + 1; info->area = request_mem_region(res->start, size, pdev->name); @@ -519,9 +612,10 @@ static int s3c2410_nand_probe(struct device *dev) goto exit_error; } - info->device = dev; - info->platform = plat; - info->regs = ioremap(res->start, size); + info->device = dev; + info->platform = plat; + info->regs = ioremap(res->start, size); + info->is_s3c2440 = is_s3c2440; if (info->regs == NULL) { printk(KERN_ERR PFX "cannot reserve register region\n"); @@ -586,6 +680,18 @@ static int s3c2410_nand_probe(struct device *dev) return err; } +/* driver device registration */ + +static int s3c2410_nand_probe(struct device *dev) +{ + return s3c24xx_nand_probe(dev, 0); +} + +static int s3c2440_nand_probe(struct device *dev) +{ + return s3c24xx_nand_probe(dev, 1); +} + static struct device_driver s3c2410_nand_driver = { .name = "s3c2410-nand", .bus = &platform_bus_type, @@ -593,14 +699,24 @@ static struct device_driver s3c2410_nand_driver = { .remove = s3c2410_nand_remove, }; +static struct device_driver s3c2440_nand_driver = { + .name = "s3c2440-nand", + .bus = &platform_bus_type, + .probe = s3c2440_nand_probe, + .remove = s3c2410_nand_remove, +}; + static int __init s3c2410_nand_init(void) { - printk("S3C2410 NAND Driver, (c) 2004 Simtec Electronics\n"); + printk("S3C24XX NAND Driver, (c) 2004 Simtec Electronics\n"); + + driver_register(&s3c2440_nand_driver); return driver_register(&s3c2410_nand_driver); } static void __exit s3c2410_nand_exit(void) { + driver_unregister(&s3c2440_nand_driver); driver_unregister(&s3c2410_nand_driver); } @@ -609,4 +725,4 @@ module_exit(s3c2410_nand_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); -MODULE_DESCRIPTION("S3C2410 MTD NAND driver"); +MODULE_DESCRIPTION("S3C24XX MTD NAND driver"); |