diff options
Diffstat (limited to 'drivers/mtd/nand/s3c2410.c')
| -rw-r--r-- | drivers/mtd/nand/s3c2410.c | 1154 |
1 files changed, 1154 insertions, 0 deletions
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c new file mode 100644 index 00000000..91121f33 --- /dev/null +++ b/drivers/mtd/nand/s3c2410.c @@ -0,0 +1,1154 @@ +/* linux/drivers/mtd/nand/s3c2410.c + * + * Copyright © 2004-2008 Simtec Electronics + * http://armlinux.simtec.co.uk/ + * Ben Dooks <ben@simtec.co.uk> + * + * Samsung S3C2410/S3C2440/S3C2412 NAND driver + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#ifdef CONFIG_MTD_NAND_S3C2410_DEBUG +#define DEBUG +#endif + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/clk.h> +#include <linux/cpufreq.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/nand_ecc.h> +#include <linux/mtd/partitions.h> + +#include <asm/io.h> + +#include <plat/regs-nand.h> +#include <plat/nand.h> + +#ifdef CONFIG_MTD_NAND_S3C2410_HWECC +static int hardware_ecc = 1; +#else +static int hardware_ecc = 0; +#endif + +#ifdef CONFIG_MTD_NAND_S3C2410_CLKSTOP +static const int clock_stop = 1; +#else +static const int clock_stop = 0; +#endif + + +/* new oob placement block for use with hardware ecc generation + */ + +static struct nand_ecclayout nand_hw_eccoob = { + .eccbytes = 3, + .eccpos = {0, 1, 2}, + .oobfree = {{8, 8}} +}; + +/* controller and mtd information */ + +struct s3c2410_nand_info; + +/** + * struct s3c2410_nand_mtd - driver MTD structure + * @mtd: The MTD instance to pass to the MTD layer. + * @chip: The NAND chip information. + * @set: The platform information supplied for this set of NAND chips. + * @info: Link back to the hardware information. + * @scan_res: The result from calling nand_scan_ident(). +*/ +struct s3c2410_nand_mtd { + struct mtd_info mtd; + struct nand_chip chip; + struct s3c2410_nand_set *set; + struct s3c2410_nand_info *info; + int scan_res; +}; + +enum s3c_cpu_type { + TYPE_S3C2410, + TYPE_S3C2412, + TYPE_S3C2440, +}; + +enum s3c_nand_clk_state { + CLOCK_DISABLE = 0, + CLOCK_ENABLE, + CLOCK_SUSPEND, +}; + +/* overview of the s3c2410 nand state */ + +/** + * struct s3c2410_nand_info - NAND controller state. + * @mtds: An array of MTD instances on this controoler. + * @platform: The platform data for this board. + * @device: The platform device we bound to. + * @area: The IO area resource that came from request_mem_region(). + * @clk: The clock resource for this controller. + * @regs: The area mapped for the hardware registers described by @area. + * @sel_reg: Pointer to the register controlling the NAND selection. + * @sel_bit: The bit in @sel_reg to select the NAND chip. + * @mtd_count: The number of MTDs created from this controller. + * @save_sel: The contents of @sel_reg to be saved over suspend. + * @clk_rate: The clock rate from @clk. + * @clk_state: The current clock state. + * @cpu_type: The exact type of this controller. + */ +struct s3c2410_nand_info { + /* mtd info */ + struct nand_hw_control controller; + struct s3c2410_nand_mtd *mtds; + struct s3c2410_platform_nand *platform; + + /* device info */ + struct device *device; + struct resource *area; + struct clk *clk; + void __iomem *regs; + void __iomem *sel_reg; + int sel_bit; + int mtd_count; + unsigned long save_sel; + unsigned long clk_rate; + enum s3c_nand_clk_state clk_state; + + enum s3c_cpu_type cpu_type; + +#ifdef CONFIG_CPU_FREQ + struct notifier_block freq_transition; +#endif +}; + +/* conversion functions */ + +static struct s3c2410_nand_mtd *s3c2410_nand_mtd_toours(struct mtd_info *mtd) +{ + return container_of(mtd, struct s3c2410_nand_mtd, mtd); +} + +static struct s3c2410_nand_info *s3c2410_nand_mtd_toinfo(struct mtd_info *mtd) +{ + return s3c2410_nand_mtd_toours(mtd)->info; +} + +static struct s3c2410_nand_info *to_nand_info(struct platform_device *dev) +{ + return platform_get_drvdata(dev); +} + +static struct s3c2410_platform_nand *to_nand_plat(struct platform_device *dev) +{ + return dev->dev.platform_data; +} + +static inline int allow_clk_suspend(struct s3c2410_nand_info *info) +{ + return clock_stop; +} + +/** + * s3c2410_nand_clk_set_state - Enable, disable or suspend NAND clock. + * @info: The controller instance. + * @new_state: State to which clock should be set. + */ +static void s3c2410_nand_clk_set_state(struct s3c2410_nand_info *info, + enum s3c_nand_clk_state new_state) +{ + if (!allow_clk_suspend(info) && new_state == CLOCK_SUSPEND) + return; + + if (info->clk_state == CLOCK_ENABLE) { + if (new_state != CLOCK_ENABLE) + clk_disable(info->clk); + } else { + if (new_state == CLOCK_ENABLE) + clk_enable(info->clk); + } + + info->clk_state = new_state; +} + +/* timing calculations */ + +#define NS_IN_KHZ 1000000 + +/** + * s3c_nand_calc_rate - calculate timing data. + * @wanted: The cycle time in nanoseconds. + * @clk: The clock rate in kHz. + * @max: The maximum divider value. + * + * Calculate the timing value from the given parameters. + */ +static int s3c_nand_calc_rate(int wanted, unsigned long clk, int max) +{ + int result; + + result = DIV_ROUND_UP((wanted * clk), NS_IN_KHZ); + + pr_debug("result %d from %ld, %d\n", result, clk, wanted); + + if (result > max) { + printk("%d ns is too big for current clock rate %ld\n", wanted, clk); + return -1; + } + + if (result < 1) + result = 1; + + return result; +} + +#define to_ns(ticks,clk) (((ticks) * NS_IN_KHZ) / (unsigned int)(clk)) + +/* controller setup */ + +/** + * s3c2410_nand_setrate - setup controller timing information. + * @info: The controller instance. + * + * Given the information supplied by the platform, calculate and set + * the necessary timing registers in the hardware to generate the + * necessary timing cycles to the hardware. + */ +static int s3c2410_nand_setrate(struct s3c2410_nand_info *info) +{ + struct s3c2410_platform_nand *plat = info->platform; + int tacls_max = (info->cpu_type == TYPE_S3C2412) ? 8 : 4; + int tacls, twrph0, twrph1; + unsigned long clkrate = clk_get_rate(info->clk); + unsigned long uninitialized_var(set), cfg, uninitialized_var(mask); + unsigned long flags; + + /* calculate the timing information for the controller */ + + info->clk_rate = clkrate; + clkrate /= 1000; /* turn clock into kHz for ease of use */ + + if (plat != NULL) { + tacls = s3c_nand_calc_rate(plat->tacls, clkrate, tacls_max); + twrph0 = s3c_nand_calc_rate(plat->twrph0, clkrate, 8); + twrph1 = s3c_nand_calc_rate(plat->twrph1, clkrate, 8); + } else { + /* default timings */ + tacls = tacls_max; + twrph0 = 8; + twrph1 = 8; + } + + if (tacls < 0 || twrph0 < 0 || twrph1 < 0) { + dev_err(info->device, "cannot get suitable timings\n"); + return -EINVAL; + } + + dev_info(info->device, "Tacls=%d, %dns Twrph0=%d %dns, Twrph1=%d %dns\n", + tacls, to_ns(tacls, clkrate), twrph0, to_ns(twrph0, clkrate), twrph1, to_ns(twrph1, clkrate)); + + switch (info->cpu_type) { + case TYPE_S3C2410: + mask = (S3C2410_NFCONF_TACLS(3) | + S3C2410_NFCONF_TWRPH0(7) | + S3C2410_NFCONF_TWRPH1(7)); + set = S3C2410_NFCONF_EN; + set |= S3C2410_NFCONF_TACLS(tacls - 1); + set |= S3C2410_NFCONF_TWRPH0(twrph0 - 1); + set |= S3C2410_NFCONF_TWRPH1(twrph1 - 1); + break; + + case TYPE_S3C2440: + case TYPE_S3C2412: + mask = (S3C2440_NFCONF_TACLS(tacls_max - 1) | + S3C2440_NFCONF_TWRPH0(7) | + S3C2440_NFCONF_TWRPH1(7)); + + set = S3C2440_NFCONF_TACLS(tacls - 1); + set |= S3C2440_NFCONF_TWRPH0(twrph0 - 1); + set |= S3C2440_NFCONF_TWRPH1(twrph1 - 1); + break; + + default: + BUG(); + } + + local_irq_save(flags); + + cfg = readl(info->regs + S3C2410_NFCONF); + cfg &= ~mask; + cfg |= set; + writel(cfg, info->regs + S3C2410_NFCONF); + + local_irq_restore(flags); + + dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg); + + return 0; +} + +/** + * s3c2410_nand_inithw - basic hardware initialisation + * @info: The hardware state. + * + * Do the basic initialisation of the hardware, using s3c2410_nand_setrate() + * to setup the hardware access speeds and set the controller to be enabled. +*/ +static int s3c2410_nand_inithw(struct s3c2410_nand_info *info) +{ + int ret; + + ret = s3c2410_nand_setrate(info); + if (ret < 0) + return ret; + + switch (info->cpu_type) { + case TYPE_S3C2410: + default: + break; + + case TYPE_S3C2440: + case TYPE_S3C2412: + /* enable the controller and de-assert nFCE */ + + writel(S3C2440_NFCONT_ENABLE, info->regs + S3C2440_NFCONT); + } + + return 0; +} + +/** + * s3c2410_nand_select_chip - select the given nand chip + * @mtd: The MTD instance for this chip. + * @chip: The chip number. + * + * This is called by the MTD layer to either select a given chip for the + * @mtd instance, or to indicate that the access has finished and the + * chip can be de-selected. + * + * The routine ensures that the nFCE line is correctly setup, and any + * platform specific selection code is called to route nFCE to the specific + * chip. + */ +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; + unsigned long cur; + + nmtd = this->priv; + info = nmtd->info; + + if (chip != -1) + s3c2410_nand_clk_set_state(info, CLOCK_ENABLE); + + cur = readl(info->sel_reg); + + if (chip == -1) { + cur |= info->sel_bit; + } else { + if (nmtd->set != NULL && chip > nmtd->set->nr_chips) { + dev_err(info->device, "invalid chip %d\n", chip); + return; + } + + if (info->platform != NULL) { + if (info->platform->select_chip != NULL) + (info->platform->select_chip) (nmtd->set, chip); + } + + cur &= ~info->sel_bit; + } + + writel(cur, info->sel_reg); + + if (chip == -1) + s3c2410_nand_clk_set_state(info, CLOCK_SUSPEND); +} + +/* s3c2410_nand_hwcontrol + * + * Issue command and address cycles to the chip +*/ + +static void s3c2410_nand_hwcontrol(struct mtd_info *mtd, int cmd, + unsigned int ctrl) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + + if (cmd == NAND_CMD_NONE) + return; + + if (ctrl & NAND_CLE) + writeb(cmd, info->regs + S3C2410_NFCMD); + else + writeb(cmd, info->regs + S3C2410_NFADDR); +} + +/* command and control functions */ + +static void s3c2440_nand_hwcontrol(struct mtd_info *mtd, int cmd, + unsigned int ctrl) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + + if (cmd == NAND_CMD_NONE) + return; + + if (ctrl & NAND_CLE) + writeb(cmd, info->regs + S3C2440_NFCMD); + else + writeb(cmd, info->regs + S3C2440_NFADDR); +} + +/* s3c2410_nand_devready() + * + * returns 0 if the nand is busy, 1 if it is ready +*/ + +static int s3c2410_nand_devready(struct mtd_info *mtd) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + return readb(info->regs + S3C2410_NFSTAT) & S3C2410_NFSTAT_BUSY; +} + +static int s3c2440_nand_devready(struct mtd_info *mtd) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + return readb(info->regs + S3C2440_NFSTAT) & S3C2440_NFSTAT_READY; +} + +static int s3c2412_nand_devready(struct mtd_info *mtd) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + return readb(info->regs + S3C2412_NFSTAT) & S3C2412_NFSTAT_READY; +} + +/* ECC handling functions */ + +static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat, + u_char *read_ecc, u_char *calc_ecc) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + unsigned int diff0, diff1, diff2; + unsigned int bit, byte; + + pr_debug("%s(%p,%p,%p,%p)\n", __func__, mtd, dat, read_ecc, calc_ecc); + + diff0 = read_ecc[0] ^ calc_ecc[0]; + diff1 = read_ecc[1] ^ calc_ecc[1]; + diff2 = read_ecc[2] ^ calc_ecc[2]; + + pr_debug("%s: rd %02x%02x%02x calc %02x%02x%02x diff %02x%02x%02x\n", + __func__, + read_ecc[0], read_ecc[1], read_ecc[2], + calc_ecc[0], calc_ecc[1], calc_ecc[2], + diff0, diff1, diff2); + + if (diff0 == 0 && diff1 == 0 && diff2 == 0) + return 0; /* ECC is ok */ + + /* sometimes people do not think about using the ECC, so check + * to see if we have an 0xff,0xff,0xff read ECC and then ignore + * the error, on the assumption that this is an un-eccd page. + */ + if (read_ecc[0] == 0xff && read_ecc[1] == 0xff && read_ecc[2] == 0xff + && info->platform->ignore_unset_ecc) + return 0; + + /* Can we correct this ECC (ie, one row and column change). + * Note, this is similar to the 256 error code on smartmedia */ + + if (((diff0 ^ (diff0 >> 1)) & 0x55) == 0x55 && + ((diff1 ^ (diff1 >> 1)) & 0x55) == 0x55 && + ((diff2 ^ (diff2 >> 1)) & 0x55) == 0x55) { + /* calculate the bit position of the error */ + + bit = ((diff2 >> 3) & 1) | + ((diff2 >> 4) & 2) | + ((diff2 >> 5) & 4); + + /* calculate the byte position of the error */ + + byte = ((diff2 << 7) & 0x100) | + ((diff1 << 0) & 0x80) | + ((diff1 << 1) & 0x40) | + ((diff1 << 2) & 0x20) | + ((diff1 << 3) & 0x10) | + ((diff0 >> 4) & 0x08) | + ((diff0 >> 3) & 0x04) | + ((diff0 >> 2) & 0x02) | + ((diff0 >> 1) & 0x01); + + dev_dbg(info->device, "correcting error bit %d, byte %d\n", + bit, byte); + + dat[byte] ^= (1 << bit); + return 1; + } + + /* if there is only one bit difference in the ECC, then + * one of only a row or column parity has changed, which + * means the error is most probably in the ECC itself */ + + diff0 |= (diff1 << 8); + diff0 |= (diff2 << 16); + + if ((diff0 & ~(1<<fls(diff0))) == 0) + return 1; + + 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); + unsigned long ctrl; + + ctrl = readl(info->regs + S3C2410_NFCONF); + ctrl |= S3C2410_NFCONF_INITECC; + writel(ctrl, info->regs + S3C2410_NFCONF); +} + +static void s3c2412_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 | S3C2412_NFCONT_INIT_MAIN_ECC, info->regs + S3C2440_NFCONT); +} + +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) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + + ecc_code[0] = readb(info->regs + S3C2410_NFECC + 0); + ecc_code[1] = readb(info->regs + S3C2410_NFECC + 1); + ecc_code[2] = readb(info->regs + S3C2410_NFECC + 2); + + pr_debug("%s: returning ecc %02x%02x%02x\n", __func__, + ecc_code[0], ecc_code[1], ecc_code[2]); + + return 0; +} + +static int s3c2412_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 + S3C2412_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; +} + +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("%s: returning ecc %06lx\n", __func__, ecc & 0xffffff); + + 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) +{ + struct nand_chip *this = mtd->priv; + readsb(this->IO_ADDR_R, buf, len); +} + +static void s3c2440_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + + readsl(info->regs + S3C2440_NFDATA, buf, len >> 2); + + /* cleanup if we've got less than a word to do */ + if (len & 3) { + buf += len & ~3; + + for (; len & 3; len--) + *buf++ = readb(info->regs + S3C2440_NFDATA); + } +} + +static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + struct nand_chip *this = mtd->priv; + writesb(this->IO_ADDR_W, buf, len); +} + +static void s3c2440_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) +{ + struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); + + writesl(info->regs + S3C2440_NFDATA, buf, len >> 2); + + /* cleanup any fractional write */ + if (len & 3) { + buf += len & ~3; + + for (; len & 3; len--, buf++) + writeb(*buf, info->regs + S3C2440_NFDATA); + } +} + +/* cpufreq driver support */ + +#ifdef CONFIG_CPU_FREQ + +static int s3c2410_nand_cpufreq_transition(struct notifier_block *nb, + unsigned long val, void *data) +{ + struct s3c2410_nand_info *info; + unsigned long newclk; + + info = container_of(nb, struct s3c2410_nand_info, freq_transition); + newclk = clk_get_rate(info->clk); + + if ((val == CPUFREQ_POSTCHANGE && newclk < info->clk_rate) || + (val == CPUFREQ_PRECHANGE && newclk > info->clk_rate)) { + s3c2410_nand_setrate(info); + } + + return 0; +} + +static inline int s3c2410_nand_cpufreq_register(struct s3c2410_nand_info *info) +{ + info->freq_transition.notifier_call = s3c2410_nand_cpufreq_transition; + + return cpufreq_register_notifier(&info->freq_transition, + CPUFREQ_TRANSITION_NOTIFIER); +} + +static inline void s3c2410_nand_cpufreq_deregister(struct s3c2410_nand_info *info) +{ + cpufreq_unregister_notifier(&info->freq_transition, + CPUFREQ_TRANSITION_NOTIFIER); +} + +#else +static inline int s3c2410_nand_cpufreq_register(struct s3c2410_nand_info *info) +{ + return 0; +} + +static inline void s3c2410_nand_cpufreq_deregister(struct s3c2410_nand_info *info) +{ +} +#endif + +/* device management functions */ + +static int s3c24xx_nand_remove(struct platform_device *pdev) +{ + struct s3c2410_nand_info *info = to_nand_info(pdev); + + platform_set_drvdata(pdev, NULL); + + if (info == NULL) + return 0; + + s3c2410_nand_cpufreq_deregister(info); + + /* Release all our mtds and their partitions, then go through + * freeing the resources used + */ + + if (info->mtds != NULL) { + struct s3c2410_nand_mtd *ptr = info->mtds; + int mtdno; + + for (mtdno = 0; mtdno < info->mtd_count; mtdno++, ptr++) { + pr_debug("releasing mtd %d (%p)\n", mtdno, ptr); + nand_release(&ptr->mtd); + } + + kfree(info->mtds); + } + + /* free the common resources */ + + if (!IS_ERR(info->clk)) { + s3c2410_nand_clk_set_state(info, CLOCK_DISABLE); + clk_put(info->clk); + } + + if (info->regs != NULL) { + iounmap(info->regs); + info->regs = NULL; + } + + if (info->area != NULL) { + release_resource(info->area); + kfree(info->area); + info->area = NULL; + } + + kfree(info); + + return 0; +} + +static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info, + struct s3c2410_nand_mtd *mtd, + struct s3c2410_nand_set *set) +{ + if (set) + mtd->mtd.name = set->name; + + return mtd_device_parse_register(&mtd->mtd, NULL, NULL, + set->partitions, set->nr_partitions); +} + +/** + * s3c2410_nand_init_chip - initialise a single instance of an chip + * @info: The base NAND controller the chip is on. + * @nmtd: The new controller MTD instance to fill in. + * @set: The information passed from the board specific platform data. + * + * Initialise the given @nmtd from the information in @info and @set. This + * readies the structure for use with the MTD layer functions by ensuring + * all pointers are setup and the necessary control routines selected. + */ +static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info, + struct s3c2410_nand_mtd *nmtd, + struct s3c2410_nand_set *set) +{ + struct nand_chip *chip = &nmtd->chip; + void __iomem *regs = info->regs; + + chip->write_buf = s3c2410_nand_write_buf; + chip->read_buf = s3c2410_nand_read_buf; + chip->select_chip = s3c2410_nand_select_chip; + chip->chip_delay = 50; + chip->priv = nmtd; + chip->options = set->options; + chip->controller = &info->controller; + + switch (info->cpu_type) { + case TYPE_S3C2410: + chip->IO_ADDR_W = regs + S3C2410_NFDATA; + info->sel_reg = regs + S3C2410_NFCONF; + info->sel_bit = S3C2410_NFCONF_nFCE; + chip->cmd_ctrl = s3c2410_nand_hwcontrol; + chip->dev_ready = s3c2410_nand_devready; + break; + + case TYPE_S3C2440: + chip->IO_ADDR_W = regs + S3C2440_NFDATA; + info->sel_reg = regs + S3C2440_NFCONT; + info->sel_bit = S3C2440_NFCONT_nFCE; + chip->cmd_ctrl = s3c2440_nand_hwcontrol; + chip->dev_ready = s3c2440_nand_devready; + chip->read_buf = s3c2440_nand_read_buf; + chip->write_buf = s3c2440_nand_write_buf; + break; + + case TYPE_S3C2412: + chip->IO_ADDR_W = regs + S3C2440_NFDATA; + info->sel_reg = regs + S3C2440_NFCONT; + info->sel_bit = S3C2412_NFCONT_nFCE0; + chip->cmd_ctrl = s3c2440_nand_hwcontrol; + chip->dev_ready = s3c2412_nand_devready; + + if (readl(regs + S3C2410_NFCONF) & S3C2412_NFCONF_NANDBOOT) + dev_info(info->device, "System booted from NAND\n"); + + break; + } + + chip->IO_ADDR_R = chip->IO_ADDR_W; + + nmtd->info = info; + nmtd->mtd.priv = chip; + nmtd->mtd.owner = THIS_MODULE; + nmtd->set = set; + + if (hardware_ecc) { + chip->ecc.calculate = s3c2410_nand_calculate_ecc; + chip->ecc.correct = s3c2410_nand_correct_data; + chip->ecc.mode = NAND_ECC_HW; + chip->ecc.strength = 1; + + switch (info->cpu_type) { + case TYPE_S3C2410: + chip->ecc.hwctl = s3c2410_nand_enable_hwecc; + chip->ecc.calculate = s3c2410_nand_calculate_ecc; + break; + + case TYPE_S3C2412: + chip->ecc.hwctl = s3c2412_nand_enable_hwecc; + chip->ecc.calculate = s3c2412_nand_calculate_ecc; + break; + + case TYPE_S3C2440: + chip->ecc.hwctl = s3c2440_nand_enable_hwecc; + chip->ecc.calculate = s3c2440_nand_calculate_ecc; + break; + + } + } else { + chip->ecc.mode = NAND_ECC_SOFT; + } + + if (set->ecc_layout != NULL) + chip->ecc.layout = set->ecc_layout; + + if (set->disable_ecc) + chip->ecc.mode = NAND_ECC_NONE; + + switch (chip->ecc.mode) { + case NAND_ECC_NONE: + dev_info(info->device, "NAND ECC disabled\n"); + break; + case NAND_ECC_SOFT: + dev_info(info->device, "NAND soft ECC\n"); + break; + case NAND_ECC_HW: + dev_info(info->device, "NAND hardware ECC\n"); + break; + default: + dev_info(info->device, "NAND ECC UNKNOWN\n"); + break; + } + + /* If you use u-boot BBT creation code, specifying this flag will + * let the kernel fish out the BBT from the NAND, and also skip the + * full NAND scan that can take 1/2s or so. Little things... */ + if (set->flash_bbt) { + chip->bbt_options |= NAND_BBT_USE_FLASH; + chip->options |= NAND_SKIP_BBTSCAN; + } +} + +/** + * s3c2410_nand_update_chip - post probe update + * @info: The controller instance. + * @nmtd: The driver version of the MTD instance. + * + * This routine is called after the chip probe has successfully completed + * and the relevant per-chip information updated. This call ensure that + * we update the internal state accordingly. + * + * The internal state is currently limited to the ECC state information. +*/ +static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info, + struct s3c2410_nand_mtd *nmtd) +{ + struct nand_chip *chip = &nmtd->chip; + + dev_dbg(info->device, "chip %p => page shift %d\n", + chip, chip->page_shift); + + if (chip->ecc.mode != NAND_ECC_HW) + return; + + /* change the behaviour depending on wether we are using + * the large or small page nand device */ + + if (chip->page_shift > 10) { + chip->ecc.size = 256; + chip->ecc.bytes = 3; + } else { + chip->ecc.size = 512; + chip->ecc.bytes = 3; + chip->ecc.layout = &nand_hw_eccoob; + } +} + +/* s3c24xx_nand_probe + * + * called by device layer when it finds a device matching + * one our driver can handled. This code checks to see if + * it can allocate all necessary resources then calls the + * nand layer to look for devices +*/ +static int s3c24xx_nand_probe(struct platform_device *pdev) +{ + struct s3c2410_platform_nand *plat = to_nand_plat(pdev); + enum s3c_cpu_type cpu_type; + struct s3c2410_nand_info *info; + struct s3c2410_nand_mtd *nmtd; + struct s3c2410_nand_set *sets; + struct resource *res; + int err = 0; + int size; + int nr_sets; + int setno; + + cpu_type = platform_get_device_id(pdev)->driver_data; + + pr_debug("s3c2410_nand_probe(%p)\n", pdev); + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (info == NULL) { + dev_err(&pdev->dev, "no memory for flash info\n"); + err = -ENOMEM; + goto exit_error; + } + + platform_set_drvdata(pdev, info); + + spin_lock_init(&info->controller.lock); + init_waitqueue_head(&info->controller.wq); + + /* get the clock source and enable it */ + + info->clk = clk_get(&pdev->dev, "nand"); + if (IS_ERR(info->clk)) { + dev_err(&pdev->dev, "failed to get clock\n"); + err = -ENOENT; + goto exit_error; + } + + s3c2410_nand_clk_set_state(info, CLOCK_ENABLE); + + /* allocate and map the resource */ + + /* currently we assume we have the one resource */ + res = pdev->resource; + size = resource_size(res); + + info->area = request_mem_region(res->start, size, pdev->name); + + if (info->area == NULL) { + dev_err(&pdev->dev, "cannot reserve register region\n"); + err = -ENOENT; + goto exit_error; + } + + info->device = &pdev->dev; + info->platform = plat; + info->regs = ioremap(res->start, size); + info->cpu_type = cpu_type; + + if (info->regs == NULL) { + dev_err(&pdev->dev, "cannot reserve register region\n"); + err = -EIO; + goto exit_error; + } + + dev_dbg(&pdev->dev, "mapped registers at %p\n", info->regs); + + /* initialise the hardware */ + + err = s3c2410_nand_inithw(info); + if (err != 0) + goto exit_error; + + sets = (plat != NULL) ? plat->sets : NULL; + nr_sets = (plat != NULL) ? plat->nr_sets : 1; + + info->mtd_count = nr_sets; + + /* allocate our information */ + + size = nr_sets * sizeof(*info->mtds); + info->mtds = kzalloc(size, GFP_KERNEL); + if (info->mtds == NULL) { + dev_err(&pdev->dev, "failed to allocate mtd storage\n"); + err = -ENOMEM; + goto exit_error; + } + + /* initialise all possible chips */ + + nmtd = info->mtds; + + for (setno = 0; setno < nr_sets; setno++, nmtd++) { + pr_debug("initialising set %d (%p, info %p)\n", setno, nmtd, info); + + s3c2410_nand_init_chip(info, nmtd, sets); + + nmtd->scan_res = nand_scan_ident(&nmtd->mtd, + (sets) ? sets->nr_chips : 1, + NULL); + + if (nmtd->scan_res == 0) { + s3c2410_nand_update_chip(info, nmtd); + nand_scan_tail(&nmtd->mtd); + s3c2410_nand_add_partition(info, nmtd, sets); + } + + if (sets != NULL) + sets++; + } + + err = s3c2410_nand_cpufreq_register(info); + if (err < 0) { + dev_err(&pdev->dev, "failed to init cpufreq support\n"); + goto exit_error; + } + + if (allow_clk_suspend(info)) { + dev_info(&pdev->dev, "clock idle support enabled\n"); + s3c2410_nand_clk_set_state(info, CLOCK_SUSPEND); + } + + pr_debug("initialised ok\n"); + return 0; + + exit_error: + s3c24xx_nand_remove(pdev); + + if (err == 0) + err = -EINVAL; + return err; +} + +/* PM Support */ +#ifdef CONFIG_PM + +static int s3c24xx_nand_suspend(struct platform_device *dev, pm_message_t pm) +{ + struct s3c2410_nand_info *info = platform_get_drvdata(dev); + + if (info) { + info->save_sel = readl(info->sel_reg); + + /* For the moment, we must ensure nFCE is high during + * the time we are suspended. This really should be + * handled by suspending the MTDs we are using, but + * that is currently not the case. */ + + writel(info->save_sel | info->sel_bit, info->sel_reg); + + s3c2410_nand_clk_set_state(info, CLOCK_DISABLE); + } + + return 0; +} + +static int s3c24xx_nand_resume(struct platform_device *dev) +{ + struct s3c2410_nand_info *info = platform_get_drvdata(dev); + unsigned long sel; + + if (info) { + s3c2410_nand_clk_set_state(info, CLOCK_ENABLE); + s3c2410_nand_inithw(info); + + /* Restore the state of the nFCE line. */ + + sel = readl(info->sel_reg); + sel &= ~info->sel_bit; + sel |= info->save_sel & info->sel_bit; + writel(sel, info->sel_reg); + + s3c2410_nand_clk_set_state(info, CLOCK_SUSPEND); + } + + return 0; +} + +#else +#define s3c24xx_nand_suspend NULL +#define s3c24xx_nand_resume NULL +#endif + +/* driver device registration */ + +static struct platform_device_id s3c24xx_driver_ids[] = { + { + .name = "s3c2410-nand", + .driver_data = TYPE_S3C2410, + }, { + .name = "s3c2440-nand", + .driver_data = TYPE_S3C2440, + }, { + .name = "s3c2412-nand", + .driver_data = TYPE_S3C2412, + }, { + .name = "s3c6400-nand", + .driver_data = TYPE_S3C2412, /* compatible with 2412 */ + }, + { } +}; + +MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids); + +static struct platform_driver s3c24xx_nand_driver = { + .probe = s3c24xx_nand_probe, + .remove = s3c24xx_nand_remove, + .suspend = s3c24xx_nand_suspend, + .resume = s3c24xx_nand_resume, + .id_table = s3c24xx_driver_ids, + .driver = { + .name = "s3c24xx-nand", + .owner = THIS_MODULE, + }, +}; + +static int __init s3c2410_nand_init(void) +{ + printk("S3C24XX NAND Driver, (c) 2004 Simtec Electronics\n"); + + return platform_driver_register(&s3c24xx_nand_driver); +} + +static void __exit s3c2410_nand_exit(void) +{ + platform_driver_unregister(&s3c24xx_nand_driver); +} + +module_init(s3c2410_nand_init); +module_exit(s3c2410_nand_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); +MODULE_DESCRIPTION("S3C24XX MTD NAND driver"); |