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authorLei Wen <leiwen@marvell.com>2010-08-18 18:00:03 +0800
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-10-24 23:39:01 +0100
commit227a886c7ead6420465abfd1242f449895b2c332 (patch)
treee45c600a6bac08384c234d96380ba7c900827022
parentc1f82478c535f1de9fecf3cafa82014f312d5d4e (diff)
mtd: pxa3xx_nand: introduce default timing to reduce read id times
We certainly don't need to send read id command times by times, since we already know what the id is after the first read id... So create a default timing which could ensure it would successfully read id out all supported chip. Then follow the build-in table to reconfigure the timing. Signed-off-by: Lei Wen <leiwen@marvell.com> Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Acked-by: Eric Miao <eric.y.miao@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/mtd/nand/pxa3xx_nand.c68
1 files changed, 33 insertions, 35 deletions
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 4e40de45f4b..621fa68189f 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -190,22 +190,27 @@ static struct pxa3xx_nand_cmdset default_cmdset = {
};
static struct pxa3xx_nand_timing timing[] = {
- { 10, 0, 20, 40, 30, 40, 11123, 110, 10, },
- { 10, 25, 15, 25, 15, 30, 25000, 60, 10, },
- { 10, 35, 15, 25, 15, 25, 25000, 60, 10, },
+ { 40, 80, 60, 100, 80, 100, 90000, 400, 40, },
+ { 10, 0, 20, 40, 30, 40, 11123, 110, 10, },
+ { 10, 25, 15, 25, 15, 30, 25000, 60, 10, },
+ { 10, 35, 15, 25, 15, 25, 25000, 60, 10, },
};
static struct pxa3xx_nand_flash builtin_flash_types[] = {
- { 0x46ec, 32, 512, 16, 16, 4096, &default_cmdset, &timing[0] },
- { 0xdaec, 64, 2048, 8, 8, 2048, &default_cmdset, &timing[0] },
- { 0xd7ec, 128, 4096, 8, 8, 8192, &default_cmdset, &timing[0] },
- { 0xa12c, 64, 2048, 8, 8, 1024, &default_cmdset, &timing[1] },
- { 0xb12c, 64, 2048, 16, 16, 1024, &default_cmdset, &timing[1] },
- { 0xdc2c, 64, 2048, 8, 8, 4096, &default_cmdset, &timing[1] },
- { 0xcc2c, 64, 2048, 16, 16, 4096, &default_cmdset, &timing[1] },
- { 0xba20, 64, 2048, 16, 16, 2048, &default_cmdset, &timing[2] },
+ { 0, 0, 2048, 8, 8, 0, &default_cmdset, &timing[0] },
+ { 0x46ec, 32, 512, 16, 16, 4096, &default_cmdset, &timing[1] },
+ { 0xdaec, 64, 2048, 8, 8, 2048, &default_cmdset, &timing[1] },
+ { 0xd7ec, 128, 4096, 8, 8, 8192, &default_cmdset, &timing[1] },
+ { 0xa12c, 64, 2048, 8, 8, 1024, &default_cmdset, &timing[2] },
+ { 0xb12c, 64, 2048, 16, 16, 1024, &default_cmdset, &timing[2] },
+ { 0xdc2c, 64, 2048, 8, 8, 4096, &default_cmdset, &timing[2] },
+ { 0xcc2c, 64, 2048, 16, 16, 4096, &default_cmdset, &timing[2] },
+ { 0xba20, 64, 2048, 16, 16, 2048, &default_cmdset, &timing[3] },
};
+/* Define a default flash type setting serve as flash detecting only */
+#define DEFAULT_FLASH_TYPE (&builtin_flash_types[0])
+
#define NDTR0_tCH(c) (min((c), 7) << 19)
#define NDTR0_tCS(c) (min((c), 7) << 16)
#define NDTR0_tWH(c) (min((c), 7) << 11)
@@ -945,36 +950,29 @@ static int pxa3xx_nand_detect_flash(struct pxa3xx_nand_info *info,
if (pxa3xx_nand_detect_config(info) == 0)
return 0;
- for (i = 0; i<pdata->num_flash; ++i) {
- f = pdata->flash + i;
-
- if (pxa3xx_nand_config_flash(info, f))
- continue;
-
- if (__readid(info, &id))
- continue;
-
- if (id == f->chip_id)
- return 0;
- }
-
- for (i = 0; i < ARRAY_SIZE(builtin_flash_types); i++) {
-
- f = &builtin_flash_types[i];
-
- if (pxa3xx_nand_config_flash(info, f))
- continue;
-
- if (__readid(info, &id))
- continue;
-
- if (id == f->chip_id)
+ /* we use default timing to detect id */
+ f = DEFAULT_FLASH_TYPE;
+ pxa3xx_nand_config_flash(info, f);
+ if (__readid(info, &id))
+ goto fail_detect;
+
+ for (i=0; i<ARRAY_SIZE(builtin_flash_types) + pdata->num_flash - 1; i++) {
+ /* we first choose the flash definition from platfrom */
+ if (i < pdata->num_flash)
+ f = pdata->flash + i;
+ else
+ f = &builtin_flash_types[i - pdata->num_flash + 1];
+ if (f->chip_id == id) {
+ dev_info(&info->pdev->dev, "detect chip id: 0x%x\n", id);
+ pxa3xx_nand_config_flash(info, f);
return 0;
+ }
}
dev_warn(&info->pdev->dev,
"failed to detect configured nand flash; found %04x instead of\n",
id);
+fail_detect:
return -ENODEV;
}