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Diffstat (limited to 'drivers/mtd/nand/s3c2410.c')
-rw-r--r--drivers/mtd/nand/s3c2410.c252
1 files changed, 135 insertions, 117 deletions
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 5b55599739f..2c262fe03d8 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -18,8 +18,9 @@
* 20-Jun-2005 BJD Updated s3c2440 support, fixed timing bug
* 08-Jul-2005 BJD Fix OOPS when no platform data supplied
* 20-Oct-2005 BJD Fix timing calculation bug
+ * 14-Jan-2006 BJD Allow clock to be stopped when idle
*
- * $Id: s3c2410.c,v 1.20 2005/11/07 11:14:31 gleixner Exp $
+ * $Id: s3c2410.c,v 1.23 2006/04/01 18:06:29 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
@@ -36,9 +37,6 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#include <config/mtd/nand/s3c2410/hwecc.h>
-#include <config/mtd/nand/s3c2410/debug.h>
-
#ifdef CONFIG_MTD_NAND_S3C2410_DEBUG
#define DEBUG
#endif
@@ -73,14 +71,20 @@ static int hardware_ecc = 1;
static int hardware_ecc = 0;
#endif
+#ifdef CONFIG_MTD_NAND_S3C2410_CLKSTOP
+static 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_oobinfo nand_hw_eccoob = {
- .useecc = MTD_NANDECC_AUTOPLACE,
- .eccbytes = 3,
- .eccpos = {0, 1, 2 },
- .oobfree = { {8, 8} }
+static struct nand_ecclayout nand_hw_eccoob = {
+ .eccbytes = 3,
+ .eccpos = {0, 1, 2},
+ .oobfree = {{8, 8}}
};
/* controller and mtd information */
@@ -135,6 +139,11 @@ static struct s3c2410_platform_nand *to_nand_plat(struct platform_device *dev)
return dev->dev.platform_data;
}
+static inline int allow_clk_stop(struct s3c2410_nand_info *info)
+{
+ return clock_stop;
+}
+
/* timing calculations */
#define NS_IN_KHZ 1000000
@@ -149,8 +158,7 @@ static int s3c2410_nand_calc_rate(int wanted, unsigned long clk, int max)
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);
+ printk("%d ns is too big for current clock rate %ld\n", wanted, clk);
return -1;
}
@@ -164,8 +172,7 @@ static int s3c2410_nand_calc_rate(int wanted, unsigned long clk, int max)
/* controller setup */
-static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
- struct platform_device *pdev)
+static int s3c2410_nand_inithw(struct s3c2410_nand_info *info, struct platform_device *pdev)
{
struct s3c2410_platform_nand *plat = to_nand_plat(pdev);
unsigned long clkrate = clk_get_rate(info->clk);
@@ -177,7 +184,7 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
clkrate /= 1000; /* turn clock into kHz for ease of use */
if (plat != NULL) {
- tacls = s3c2410_nand_calc_rate(plat->tacls, clkrate, 4);
+ 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 {
@@ -193,19 +200,22 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
}
printk(KERN_INFO PFX "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));
+ tacls, to_ns(tacls, clkrate), twrph0, to_ns(twrph0, clkrate), twrph1, to_ns(twrph1, clkrate));
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);
+ 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);
+ cfg = S3C2440_NFCONF_TACLS(tacls - 1);
+ cfg |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);
+ cfg |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);
+
+ /* enable the controller and de-assert nFCE */
+
+ writel(S3C2440_NFCONT_ENABLE | S3C2440_NFCONT_ENABLE,
+ info->regs + S3C2440_NFCONT);
}
pr_debug(PFX "NF_CONF is 0x%lx\n", cfg);
@@ -229,7 +239,10 @@ static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip)
info = nmtd->info;
bit = (info->is_s3c2440) ? S3C2440_NFCONT_nFCE : S3C2410_NFCONF_nFCE;
- reg = info->regs+((info->is_s3c2440) ? S3C2440_NFCONT:S3C2410_NFCONF);
+ reg = info->regs + ((info->is_s3c2440) ? S3C2440_NFCONT : S3C2410_NFCONF);
+
+ if (chip != -1 && allow_clk_stop(info))
+ clk_enable(info->clk);
cur = readl(reg);
@@ -243,77 +256,51 @@ static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip)
if (info->platform != NULL) {
if (info->platform->select_chip != NULL)
- (info->platform->select_chip)(nmtd->set, chip);
+ (info->platform->select_chip) (nmtd->set, chip);
}
cur &= ~bit;
}
writel(cur, reg);
+
+ if (chip == -1 && allow_clk_stop(info))
+ clk_disable(info->clk);
}
-/* 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.
+/* s3c2410_nand_hwcontrol
*
+ * Issue command and address cycles to the chip
*/
-static void s3c2410_nand_hwcontrol(struct mtd_info *mtd, int cmd)
+static void s3c2410_nand_hwcontrol(struct mtd_info *mtd, int cmd,
+ unsigned int ctrl)
{
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:
- 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;
- }
+
+ 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)
+static void s3c2440_nand_hwcontrol(struct mtd_info *mtd, int cmd,
+ unsigned int ctrl)
{
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:
- printk(KERN_ERR "%s: called for NCE\n", __FUNCTION__);
- break;
-
- case NAND_CTL_SETCLE:
- chip->IO_ADDR_W = info->regs + S3C2440_NFCMD;
- break;
-
- case NAND_CTL_SETALE:
- chip->IO_ADDR_W = info->regs + S3C2440_NFADDR;
- break;
-
- /* NAND_CTL_CLRCLE: */
- /* NAND_CTL_CLRALE: */
- default:
- chip->IO_ADDR_W = info->regs + S3C2440_NFDATA;
- break;
- }
+
+ 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()
@@ -330,22 +317,16 @@ static int s3c2410_nand_devready(struct mtd_info *mtd)
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,
- u_char *read_ecc, u_char *calc_ecc)
+static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
{
- pr_debug("s3c2410_nand_correct_data(%p,%p,%p,%p)\n",
- mtd, dat, read_ecc, calc_ecc);
+ pr_debug("s3c2410_nand_correct_data(%p,%p,%p,%p)\n", mtd, dat, read_ecc, calc_ecc);
pr_debug("eccs: read %02x,%02x,%02x vs calc %02x,%02x,%02x\n",
- read_ecc[0], read_ecc[1], read_ecc[2],
- calc_ecc[0], calc_ecc[1], calc_ecc[2]);
+ read_ecc[0], read_ecc[1], read_ecc[2], calc_ecc[0], calc_ecc[1], calc_ecc[2]);
- if (read_ecc[0] == calc_ecc[0] &&
- read_ecc[1] == calc_ecc[1] &&
- read_ecc[2] == calc_ecc[2])
+ if (read_ecc[0] == calc_ecc[0] && read_ecc[1] == calc_ecc[1] && read_ecc[2] == calc_ecc[2])
return 0;
/* we curently have no method for correcting the error */
@@ -378,8 +359,7 @@ static void s3c2440_nand_enable_hwecc(struct mtd_info *mtd, int mode)
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)
+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);
@@ -387,15 +367,12 @@ static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd,
ecc_code[1] = readb(info->regs + S3C2410_NFECC + 1);
ecc_code[2] = readb(info->regs + S3C2410_NFECC + 2);
- pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n",
- ecc_code[0], ecc_code[1], ecc_code[2]);
+ 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)
+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);
@@ -404,13 +381,11 @@ static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd,
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]);
+ 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
*/
@@ -421,8 +396,7 @@ static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
readsb(this->IO_ADDR_R, buf, len);
}
-static void s3c2410_nand_write_buf(struct mtd_info *mtd,
- const u_char *buf, int len)
+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);
@@ -459,7 +433,8 @@ static int s3c2410_nand_remove(struct platform_device *pdev)
/* free the common resources */
if (info->clk != NULL && !IS_ERR(info->clk)) {
- clk_disable(info->clk);
+ if (!allow_clk_stop(info))
+ clk_disable(info->clk);
clk_put(info->clk);
}
@@ -488,9 +463,7 @@ static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
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);
+ return add_mtd_partitions(&mtd->mtd, set->partitions, set->nr_partitions);
}
return add_mtd_device(&mtd->mtd);
@@ -517,7 +490,7 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
chip->IO_ADDR_R = info->regs + S3C2410_NFDATA;
chip->IO_ADDR_W = info->regs + S3C2410_NFDATA;
- chip->hwcontrol = s3c2410_nand_hwcontrol;
+ chip->cmd_ctrl = s3c2410_nand_hwcontrol;
chip->dev_ready = s3c2410_nand_devready;
chip->write_buf = s3c2410_nand_write_buf;
chip->read_buf = s3c2410_nand_read_buf;
@@ -530,26 +503,29 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
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;
+ chip->cmd_ctrl = s3c2440_nand_hwcontrol;
}
nmtd->info = info;
nmtd->mtd.priv = chip;
+ nmtd->mtd.owner = THIS_MODULE;
nmtd->set = set;
if (hardware_ecc) {
- chip->correct_data = s3c2410_nand_correct_data;
- chip->enable_hwecc = s3c2410_nand_enable_hwecc;
- chip->calculate_ecc = s3c2410_nand_calculate_ecc;
- chip->eccmode = NAND_ECC_HW3_512;
- chip->autooob = &nand_hw_eccoob;
+ chip->ecc.correct = s3c2410_nand_correct_data;
+ chip->ecc.hwctl = s3c2410_nand_enable_hwecc;
+ chip->ecc.calculate = s3c2410_nand_calculate_ecc;
+ chip->ecc.mode = NAND_ECC_HW;
+ chip->ecc.size = 512;
+ chip->ecc.bytes = 3;
+ chip->ecc.layout = &nand_hw_eccoob;
if (info->is_s3c2440) {
- chip->enable_hwecc = s3c2440_nand_enable_hwecc;
- chip->calculate_ecc = s3c2440_nand_calculate_ecc;
+ chip->ecc.hwctl = s3c2440_nand_enable_hwecc;
+ chip->ecc.calculate = s3c2440_nand_calculate_ecc;
}
} else {
- chip->eccmode = NAND_ECC_SOFT;
+ chip->ecc.mode = NAND_ECC_SOFT;
}
}
@@ -654,13 +630,11 @@ static int s3c24xx_nand_probe(struct platform_device *pdev, int is_s3c2440)
nmtd = info->mtds;
for (setno = 0; setno < nr_sets; setno++, nmtd++) {
- pr_debug("initialising set %d (%p, info %p)\n",
- setno, nmtd, info);
+ pr_debug("initialising set %d (%p, info %p)\n", setno, nmtd, info);
s3c2410_nand_init_chip(info, nmtd, sets);
- nmtd->scan_res = nand_scan(&nmtd->mtd,
- (sets) ? sets->nr_chips : 1);
+ nmtd->scan_res = nand_scan(&nmtd->mtd, (sets) ? sets->nr_chips : 1);
if (nmtd->scan_res == 0) {
s3c2410_nand_add_partition(info, nmtd, sets);
@@ -670,6 +644,11 @@ static int s3c24xx_nand_probe(struct platform_device *pdev, int is_s3c2440)
sets++;
}
+ if (allow_clk_stop(info)) {
+ dev_info(&pdev->dev, "clock idle support enabled\n");
+ clk_disable(info->clk);
+ }
+
pr_debug("initialised ok\n");
return 0;
@@ -681,6 +660,41 @@ static int s3c24xx_nand_probe(struct platform_device *pdev, int is_s3c2440)
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) {
+ if (!allow_clk_stop(info))
+ clk_disable(info->clk);
+ }
+
+ return 0;
+}
+
+static int s3c24xx_nand_resume(struct platform_device *dev)
+{
+ struct s3c2410_nand_info *info = platform_get_drvdata(dev);
+
+ if (info) {
+ clk_enable(info->clk);
+ s3c2410_nand_inithw(info, dev);
+
+ if (allow_clk_stop(info))
+ clk_disable(info->clk);
+ }
+
+ return 0;
+}
+
+#else
+#define s3c24xx_nand_suspend NULL
+#define s3c24xx_nand_resume NULL
+#endif
+
/* driver device registration */
static int s3c2410_nand_probe(struct platform_device *dev)
@@ -696,6 +710,8 @@ static int s3c2440_nand_probe(struct platform_device *dev)
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,
@@ -705,6 +721,8 @@ static struct platform_driver s3c2410_nand_driver = {
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,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 14:50:47 +0000