aboutsummaryrefslogtreecommitdiff
path: root/drivers/mtd
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/devices/mtd_dataflash.c2
-rw-r--r--drivers/mtd/mtdsuper.c3
-rw-r--r--drivers/mtd/nand/mxc_nand.c40
-rw-r--r--drivers/mtd/nand/s3c2410.c259
4 files changed, 201 insertions, 103 deletions
diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index 62dee54af0a..43976aa4dbb 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -178,7 +178,7 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
/* Calculate flash page address; use block erase (for speed) if
* we're at a block boundary and need to erase the whole block.
*/
- pageaddr = div_u64(instr->len, priv->page_size);
+ pageaddr = div_u64(instr->addr, priv->page_size);
do_block = (pageaddr & 0x7) == 0 && instr->len >= blocksize;
pageaddr = pageaddr << priv->page_offset;
diff --git a/drivers/mtd/mtdsuper.c b/drivers/mtd/mtdsuper.c
index 92285d0089c..af8b42e0a55 100644
--- a/drivers/mtd/mtdsuper.c
+++ b/drivers/mtd/mtdsuper.c
@@ -74,8 +74,7 @@ static int get_sb_mtd_aux(struct file_system_type *fs_type, int flags,
ret = fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
if (ret < 0) {
- up_write(&sb->s_umount);
- deactivate_super(sb);
+ deactivate_locked_super(sb);
return ret;
}
diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index da41ea82941..76beea40d2c 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -842,6 +842,7 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
break;
case NAND_CMD_READID:
+ host->col_addr = 0;
send_read_id(host);
break;
@@ -878,6 +879,7 @@ static int __init mxcnd_probe(struct platform_device *pdev)
mtd->priv = this;
mtd->owner = THIS_MODULE;
mtd->dev.parent = &pdev->dev;
+ mtd->name = "mxc_nand";
/* 50 us command delay time */
this->chip_delay = 5;
@@ -893,8 +895,10 @@ static int __init mxcnd_probe(struct platform_device *pdev)
this->verify_buf = mxc_nand_verify_buf;
host->clk = clk_get(&pdev->dev, "nfc");
- if (IS_ERR(host->clk))
+ if (IS_ERR(host->clk)) {
+ err = PTR_ERR(host->clk);
goto eclk;
+ }
clk_enable(host->clk);
host->clk_act = 1;
@@ -907,7 +911,7 @@ static int __init mxcnd_probe(struct platform_device *pdev)
host->regs = ioremap(res->start, res->end - res->start + 1);
if (!host->regs) {
- err = -EIO;
+ err = -ENOMEM;
goto eres;
}
@@ -1053,25 +1057,35 @@ static int __devexit mxcnd_remove(struct platform_device *pdev)
#ifdef CONFIG_PM
static int mxcnd_suspend(struct platform_device *pdev, pm_message_t state)
{
- struct mtd_info *info = platform_get_drvdata(pdev);
+ struct mtd_info *mtd = platform_get_drvdata(pdev);
+ struct nand_chip *nand_chip = mtd->priv;
+ struct mxc_nand_host *host = nand_chip->priv;
int ret = 0;
DEBUG(MTD_DEBUG_LEVEL0, "MXC_ND : NAND suspend\n");
-
- /* Disable the NFC clock */
- clk_disable(nfc_clk); /* FIXME */
+ if (mtd) {
+ ret = mtd->suspend(mtd);
+ /* Disable the NFC clock */
+ clk_disable(host->clk);
+ }
return ret;
}
static int mxcnd_resume(struct platform_device *pdev)
{
- struct mtd_info *info = platform_get_drvdata(pdev);
+ struct mtd_info *mtd = platform_get_drvdata(pdev);
+ struct nand_chip *nand_chip = mtd->priv;
+ struct mxc_nand_host *host = nand_chip->priv;
int ret = 0;
DEBUG(MTD_DEBUG_LEVEL0, "MXC_ND : NAND resume\n");
- /* Enable the NFC clock */
- clk_enable(nfc_clk); /* FIXME */
+
+ if (mtd) {
+ /* Enable the NFC clock */
+ clk_enable(host->clk);
+ mtd->resume(mtd);
+ }
return ret;
}
@@ -1092,13 +1106,7 @@ static struct platform_driver mxcnd_driver = {
static int __init mxc_nd_init(void)
{
- /* Register the device driver structure. */
- pr_info("MXC MTD nand Driver\n");
- if (platform_driver_probe(&mxcnd_driver, mxcnd_probe) != 0) {
- printk(KERN_ERR "Driver register failed for mxcnd_driver\n");
- return -ENODEV;
- }
- return 0;
+ return platform_driver_probe(&mxcnd_driver, mxcnd_probe);
}
static void __exit mxc_nd_cleanup(void)
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 776756e4ebe..01a105eda3f 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -74,6 +74,14 @@ static struct nand_ecclayout nand_hw_eccoob = {
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;
@@ -90,6 +98,21 @@ enum s3c_cpu_type {
/* 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.
+ * @cpu_type: The exact type of this controller.
+ */
struct s3c2410_nand_info {
/* mtd info */
struct nand_hw_control controller;
@@ -145,12 +168,19 @@ static inline int allow_clk_stop(struct s3c2410_nand_info *info)
#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 = (wanted * clk) / NS_IN_KHZ;
- result++;
+ result = DIV_ROUND_UP((wanted * clk), NS_IN_KHZ);
pr_debug("result %d from %ld, %d\n", result, clk, wanted);
@@ -169,13 +199,21 @@ static int s3c_nand_calc_rate(int wanted, unsigned long clk, int max)
/* 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 set, cfg, mask;
+ unsigned long uninitialized_var(set), cfg, uninitialized_var(mask);
unsigned long flags;
/* calculate the timing information for the controller */
@@ -225,14 +263,9 @@ static int s3c2410_nand_setrate(struct s3c2410_nand_info *info)
break;
default:
- /* keep compiler happy */
- mask = 0;
- set = 0;
BUG();
}
- dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg);
-
local_irq_save(flags);
cfg = readl(info->regs + S3C2410_NFCONF);
@@ -242,9 +275,18 @@ static int s3c2410_nand_setrate(struct s3c2410_nand_info *info)
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;
@@ -268,8 +310,19 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info)
return 0;
}
-/* select chip */
-
+/**
+ * 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;
@@ -530,7 +583,16 @@ static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int 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 / 4);
+
+ 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)
@@ -542,7 +604,16 @@ static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int
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 / 4);
+
+ 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 */
@@ -593,7 +664,7 @@ static inline void s3c2410_nand_cpufreq_deregister(struct s3c2410_nand_info *inf
/* device management functions */
-static int s3c2410_nand_remove(struct platform_device *pdev)
+static int s3c24xx_nand_remove(struct platform_device *pdev)
{
struct s3c2410_nand_info *info = to_nand_info(pdev);
@@ -645,17 +716,31 @@ static int s3c2410_nand_remove(struct platform_device *pdev)
}
#ifdef CONFIG_MTD_PARTITIONS
+const char *part_probes[] = { "cmdlinepart", NULL };
static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
struct s3c2410_nand_mtd *mtd,
struct s3c2410_nand_set *set)
{
+ struct mtd_partition *part_info;
+ int nr_part = 0;
+
if (set == NULL)
return add_mtd_device(&mtd->mtd);
- if (set->nr_partitions > 0 && set->partitions != NULL) {
- return add_mtd_partitions(&mtd->mtd, set->partitions, set->nr_partitions);
+ if (set->nr_partitions == 0) {
+ mtd->mtd.name = set->name;
+ nr_part = parse_mtd_partitions(&mtd->mtd, part_probes,
+ &part_info, 0);
+ } else {
+ if (set->nr_partitions > 0 && set->partitions != NULL) {
+ nr_part = set->nr_partitions;
+ part_info = set->partitions;
+ }
}
+ if (nr_part > 0 && part_info)
+ return add_mtd_partitions(&mtd->mtd, part_info, nr_part);
+
return add_mtd_device(&mtd->mtd);
}
#else
@@ -667,11 +752,16 @@ static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
}
#endif
-/* s3c2410_nand_init_chip
+/**
+ * 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.
*
- * init a single instance of an chip
-*/
-
+ * 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)
@@ -757,14 +847,40 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
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->options |= NAND_USE_FLASH_BBT | NAND_SKIP_BBTSCAN;
}
-/* s3c2410_nand_update_chip
+/**
+ * s3c2410_nand_update_chip - post probe update
+ * @info: The controller instance.
+ * @nmtd: The driver version of the MTD instance.
*
- * post-probe chip update, to change any items, such as the
- * layout for large page nand
- */
-
+ * This routine is called after the chip probe has succesfully 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)
{
@@ -773,33 +889,33 @@ static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
dev_dbg(info->device, "chip %p => page shift %d\n",
chip, chip->page_shift);
- if (hardware_ecc) {
+ 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;
- }
+ 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;
}
}
-/* s3c2410_nand_probe
+/* 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,
- enum s3c_cpu_type cpu_type)
+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;
@@ -809,6 +925,8 @@ static int s3c24xx_nand_probe(struct platform_device *pdev,
int nr_sets;
int setno;
+ cpu_type = platform_get_device_id(pdev)->driver_data;
+
pr_debug("s3c2410_nand_probe(%p)\n", pdev);
info = kmalloc(sizeof(*info), GFP_KERNEL);
@@ -922,7 +1040,7 @@ static int s3c24xx_nand_probe(struct platform_device *pdev,
return 0;
exit_error:
- s3c2410_nand_remove(pdev);
+ s3c24xx_nand_remove(pdev);
if (err == 0)
err = -EINVAL;
@@ -983,50 +1101,30 @@ static int s3c24xx_nand_resume(struct platform_device *dev)
/* driver device registration */
-static int s3c2410_nand_probe(struct platform_device *dev)
-{
- return s3c24xx_nand_probe(dev, TYPE_S3C2410);
-}
-
-static int s3c2440_nand_probe(struct platform_device *dev)
-{
- return s3c24xx_nand_probe(dev, TYPE_S3C2440);
-}
-
-static int s3c2412_nand_probe(struct platform_device *dev)
-{
- return s3c24xx_nand_probe(dev, TYPE_S3C2412);
-}
-
-static struct platform_driver s3c2410_nand_driver = {
- .probe = s3c2410_nand_probe,
- .remove = s3c2410_nand_remove,
- .suspend = s3c24xx_nand_suspend,
- .resume = s3c24xx_nand_resume,
- .driver = {
- .name = "s3c2410-nand",
- .owner = THIS_MODULE,
+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,
},
+ { }
};
-static struct platform_driver s3c2440_nand_driver = {
- .probe = s3c2440_nand_probe,
- .remove = s3c2410_nand_remove,
- .suspend = s3c24xx_nand_suspend,
- .resume = s3c24xx_nand_resume,
- .driver = {
- .name = "s3c2440-nand",
- .owner = THIS_MODULE,
- },
-};
+MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
-static struct platform_driver s3c2412_nand_driver = {
- .probe = s3c2412_nand_probe,
- .remove = s3c2410_nand_remove,
+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 = "s3c2412-nand",
+ .name = "s3c24xx-nand",
.owner = THIS_MODULE,
},
};
@@ -1035,16 +1133,12 @@ static int __init s3c2410_nand_init(void)
{
printk("S3C24XX NAND Driver, (c) 2004 Simtec Electronics\n");
- platform_driver_register(&s3c2412_nand_driver);
- platform_driver_register(&s3c2440_nand_driver);
- return platform_driver_register(&s3c2410_nand_driver);
+ return platform_driver_register(&s3c24xx_nand_driver);
}
static void __exit s3c2410_nand_exit(void)
{
- platform_driver_unregister(&s3c2412_nand_driver);
- platform_driver_unregister(&s3c2440_nand_driver);
- platform_driver_unregister(&s3c2410_nand_driver);
+ platform_driver_unregister(&s3c24xx_nand_driver);
}
module_init(s3c2410_nand_init);
@@ -1053,6 +1147,3 @@ module_exit(s3c2410_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("S3C24XX MTD NAND driver");
-MODULE_ALIAS("platform:s3c2410-nand");
-MODULE_ALIAS("platform:s3c2412-nand");
-MODULE_ALIAS("platform:s3c2440-nand");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-24 00:43:52 +0000