Patchwork [04/06] pxa3xx_nand: introduce default timing to reduce read id times

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Submitter Haojian Zhuang
Date Aug. 17, 2010, 12:30 p.m.
Message ID <AANLkTikKcqxSiF8J0wHmi0uST86ZGzu4427Ev=khQK5k@mail.gmail.com>
Download mbox | patch
Permalink /patch/61887/
State New
Headers show

Comments

Haojian Zhuang - Aug. 17, 2010, 12:30 p.m.
From 98f87313ddcbb19b41d7c62b69169279371e83d8 Mon Sep 17 00:00:00 2001
From: Lei Wen <leiwen@marvell.com>
Date: Tue, 17 Aug 2010 14:01:15 +0800
Subject: [PATCH 04/06] 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>
---
 drivers/mtd/nand/pxa3xx_nand.c |   68 +++++++++++++++++++--------------------
 1 files changed, 33 insertions(+), 35 deletions(-)

Patch

From 98f87313ddcbb19b41d7c62b69169279371e83d8 Mon Sep 17 00:00:00 2001
From: Lei Wen <leiwen@marvell.com>
Date: Tue, 17 Aug 2010 14:01:15 +0800
Subject: [PATCH 04/12] 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>
---
 drivers/mtd/nand/pxa3xx_nand.c |   68 +++++++++++++++++++--------------------
 1 files changed, 33 insertions(+), 35 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index e3061bc..61fe2e2 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 __devinitdata 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 __devinitdata 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;
 }
 
-- 
1.7.0.4