[PATCH 02/25] pxa3xx_nand: introduce common timing to reduce

[Lei Wen]

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 common 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 at marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang at marvell.com>
---
 drivers/mtd/nand/pxa3xx_nand.c |   72 ++++++++++++++++-----------------------
 1 files changed, 30 insertions(+), 42 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 013e075..f939083 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -226,23 +226,26 @@ const static struct pxa3xx_nand_cmdset cmdset = {
 };

 static struct pxa3xx_nand_timing __devinitdata timing[] = {
+	/* common timing used to detect flash id */
+	{ 40, 80, 60, 100, 80, 100, 90000, 400, 40, },
 	/* Samsung NAND series */
-	{ 10,  0, 20, 40, 30, 40, 11123, 110, 10, },
+	{ 10,  0, 20,  40, 30,  40, 11123, 110, 10, },
 	/* Micron NAND series */
-	{ 10, 25, 15, 25, 15, 30, 25000,  60, 10, },
+	{ 10, 25, 15,  25, 15,  30, 25000,  60, 10, },
 	/* ST NAND series */
-	{ 10, 35, 15, 25, 15, 25, 25000,  60, 10, },
+	{ 10, 35, 15,  25, 15,  25, 25000,  60, 10, },
 };

 static struct pxa3xx_nand_flash __devinitdata builtin_flash_types[] = {
-	{ 0x46ec,  32,  512, 16, 16, 4096, &timing[0], },
-	{ 0xdaec,  64, 2048,  8,  8, 2048, &timing[0], },
-	{ 0xd7ec, 128, 4096,  8,  8, 8192, &timing[0], },
-	{ 0xa12c,  64, 2048,  8,  8, 1024, &timing[1], },
-	{ 0xb12c,  64, 2048, 16, 16, 1024, &timing[1], },
-	{ 0xdc2c,  64, 2048,  8,  8, 4096, &timing[1], },
-	{ 0xcc2c,  64, 2048, 16, 16, 4096, &timing[1], },
-	{ 0xba20,  64, 2048, 16, 16, 2048, &timing[2], },
+	{      0,   0,    0,  0,  0,    0, &timing[0], },
+	{ 0x46ec,  32,  512, 16, 16, 4096, &timing[1], },
+	{ 0xdaec,  64, 2048,  8,  8, 2048, &timing[1], },
+	{ 0xd7ec, 128, 4096,  8,  8, 8192, &timing[1], },
+	{ 0xa12c,  64, 2048,  8,  8, 1024, &timing[2], },
+	{ 0xb12c,  64, 2048, 16, 16, 1024, &timing[2], },
+	{ 0xdc2c,  64, 2048,  8,  8, 4096, &timing[2], },
+	{ 0xcc2c,  64, 2048, 16, 16, 4096, &timing[2], },
+	{ 0xba20,  64, 2048, 16, 16, 2048, &timing[3], },
 };

 #define NDTR0_tCH(c)	(min((c), 7) << 19)
@@ -859,12 +862,6 @@ static int pxa3xx_nand_config_flash(struct
pxa3xx_nand_info *info,
 	struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data;
 	uint32_t ndcr = 0x00000FFF; /* disable all interrupts */

-	if (f->page_size != 2048 && f->page_size != 512)
-		return -EINVAL;
-
-	if (f->flash_width != 16 && f->flash_width != 8)
-		return -EINVAL;
-
 	/* calculate flash information */
 	info->oob_size = (f->page_size == 2048) ? 64 : 16;
 	info->read_id_bytes = (f->page_size == 2048) ? 4 : 2;
@@ -976,36 +973,27 @@ 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)
+	f = &builtin_flash_types[0];
+	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++) {
+		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",
+			"failed to detect configured nand flash; found %04x instead of\n",
 		 id);
+fail_detect:
 	return -ENODEV;
 }

-- 
1.7.0.4