[PATCH v3 4/9] mtd: pxa3xx_nand: rework timings setup

Antoine Tenart antoine.tenart at free-electrons.com
Thu Mar 5 03:31:20 PST 2015


Use the nand framework helpers: onfi_get_async_timing_mode() and
onfi_async_timing_mode_to_sdr_timings() to retrieve the timing
configuration. Then update the pxa3xx timing setup function to use the
timing configuration retrieved.

Signed-off-by: Antoine Tenart <antoine.tenart at free-electrons.com>
---
 drivers/mtd/nand/pxa3xx_nand.c                | 101 ++++++++++++++++++--------
 include/linux/platform_data/mtd-nand-pxa3xx.h |   2 -
 2 files changed, 69 insertions(+), 34 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index dc0edbc406bb..4bcfb4cf6fee 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -243,23 +243,16 @@ static bool use_dma = 1;
 module_param(use_dma, bool, 0444);
 MODULE_PARM_DESC(use_dma, "enable DMA for data transferring to/from NAND HW");
 
-static struct pxa3xx_nand_timing timing[] = {
-	{ 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[] = {
-{ "DEFAULT FLASH",      0,   0, 2048,  8,  8,    0, &timing[0] },
-{ "64MiB 16-bit",  0x46ec,  32,  512, 16, 16, 4096, &timing[1] },
-{ "256MiB 8-bit",  0xdaec,  64, 2048,  8,  8, 2048, &timing[1] },
-{ "4GiB 8-bit",    0xd7ec, 128, 4096,  8,  8, 8192, &timing[1] },
-{ "128MiB 8-bit",  0xa12c,  64, 2048,  8,  8, 1024, &timing[2] },
-{ "128MiB 16-bit", 0xb12c,  64, 2048, 16, 16, 1024, &timing[2] },
-{ "512MiB 8-bit",  0xdc2c,  64, 2048,  8,  8, 4096, &timing[2] },
-{ "512MiB 16-bit", 0xcc2c,  64, 2048, 16, 16, 4096, &timing[2] },
-{ "256MiB 16-bit", 0xba20,  64, 2048, 16, 16, 2048, &timing[3] },
+{ "DEFAULT FLASH",      0,   0, 2048,  8,  8,    0 },
+{ "64MiB 16-bit",  0x46ec,  32,  512, 16, 16, 4096 },
+{ "256MiB 8-bit",  0xdaec,  64, 2048,  8,  8, 2048 },
+{ "4GiB 8-bit",    0xd7ec, 128, 4096,  8,  8, 8192 },
+{ "128MiB 8-bit",  0xa12c,  64, 2048,  8,  8, 1024 },
+{ "128MiB 16-bit", 0xb12c,  64, 2048, 16, 16, 1024 },
+{ "512MiB 8-bit",  0xdc2c,  64, 2048,  8,  8, 4096 },
+{ "512MiB 16-bit", 0xcc2c,  64, 2048, 16, 16, 4096 },
+{ "256MiB 16-bit", 0xba20,  64, 2048, 16, 16, 2048 },
 };
 
 static u8 bbt_pattern[] = {'M', 'V', 'B', 'b', 't', '0' };
@@ -361,22 +354,31 @@ pxa3xx_nand_get_variant(struct platform_device *pdev)
 }
 
 static void pxa3xx_nand_set_timing(struct pxa3xx_nand_host *host,
-				   const struct pxa3xx_nand_timing *t)
+				   const struct nand_sdr_timings *t)
 {
 	struct pxa3xx_nand_info *info = host->info_data;
 	unsigned long nand_clk = clk_get_rate(info->clk);
 	uint32_t ndtr0, ndtr1;
-
-	ndtr0 = NDTR0_tCH(ns2cycle(t->tCH, nand_clk)) |
-		NDTR0_tCS(ns2cycle(t->tCS, nand_clk)) |
-		NDTR0_tWH(ns2cycle(t->tWH, nand_clk)) |
-		NDTR0_tWP(ns2cycle(t->tWP, nand_clk)) |
-		NDTR0_tRH(ns2cycle(t->tRH, nand_clk)) |
-		NDTR0_tRP(ns2cycle(t->tRP, nand_clk));
-
-	ndtr1 = NDTR1_tR(ns2cycle(t->tR, nand_clk)) |
-		NDTR1_tWHR(ns2cycle(t->tWHR, nand_clk)) |
-		NDTR1_tAR(ns2cycle(t->tAR, nand_clk));
+	u32 tCH_min = DIV_ROUND_UP(t->tCH_min, 1000);
+	u32 tCS_min = DIV_ROUND_UP(t->tCS_min, 1000);
+	u32 tWH_min = DIV_ROUND_UP(t->tWH_min, 1000);
+	u32 tWP_min = DIV_ROUND_UP(t->tWP_min, 1000);
+	u32 tREH_min = DIV_ROUND_UP(t->tREH_min, 1000);
+	u32 tRP_min = DIV_ROUND_UP(t->tRP_min, 1000);
+	u32 tRST_max = DIV_ROUND_UP_ULL(t->tRST_max, 1000);
+	u32 tWHR_min = DIV_ROUND_UP(t->tWHR_min, 1000);
+	u32 tAR_min = DIV_ROUND_UP(t->tAR_min, 1000);
+
+	ndtr0 = NDTR0_tCH(ns2cycle(tCH_min, nand_clk)) |
+		NDTR0_tCS(ns2cycle(tCS_min, nand_clk)) |
+		NDTR0_tWH(ns2cycle(tWH_min, nand_clk)) |
+		NDTR0_tWP(ns2cycle(tWP_min, nand_clk)) |
+		NDTR0_tRH(ns2cycle(tREH_min, nand_clk)) |
+		NDTR0_tRP(ns2cycle(tRP_min, nand_clk));
+
+	ndtr1 = NDTR1_tR(ns2cycle(tRST_max, nand_clk)) |
+		NDTR1_tWHR(ns2cycle(tWHR_min, nand_clk)) |
+		NDTR1_tAR(ns2cycle(tAR_min, nand_clk));
 
 	info->ndtr0cs0 = ndtr0;
 	info->ndtr1cs0 = ndtr1;
@@ -384,6 +386,29 @@ static void pxa3xx_nand_set_timing(struct pxa3xx_nand_host *host,
 	nand_writel(info, NDTR1CS0, ndtr1);
 }
 
+static int pxa3xx_nand_init_timings(struct pxa3xx_nand_host *host)
+{
+	const struct nand_sdr_timings *timings;
+	int mode;
+
+	mode = onfi_get_async_timing_mode(&host->chip);
+	if (mode == ONFI_TIMING_MODE_UNKNOWN) {
+		mode = host->chip.onfi_timing_mode_default;
+	} else {
+		mode = fls(mode) - 1;
+		if (mode < 0)
+			mode = 0;
+	}
+
+	timings = onfi_async_timing_mode_to_sdr_timings(mode);
+	if (IS_ERR(timings))
+		return PTR_ERR(timings);
+
+	pxa3xx_nand_set_timing(host, timings);
+
+	return 0;
+}
+
 /*
  * Set the data and OOB size, depending on the selected
  * spare and ECC configuration.
@@ -1226,7 +1251,6 @@ static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info,
 
 	info->reg_ndcr = ndcr;
 
-	pxa3xx_nand_set_timing(host, f->timing);
 	return 0;
 }
 
@@ -1321,20 +1345,28 @@ static void pxa3xx_nand_free_buff(struct pxa3xx_nand_info *info)
 }
 #endif
 
-static int pxa3xx_nand_sensing(struct pxa3xx_nand_info *info)
+static int pxa3xx_nand_sensing(struct pxa3xx_nand_host *host)
 {
+	struct pxa3xx_nand_info *info = host->info_data;
 	struct mtd_info *mtd;
 	struct nand_chip *chip;
+	const struct nand_sdr_timings *timings;
 	int ret;
 
 	mtd = info->host[info->cs]->mtd;
 	chip = mtd->priv;
 
-	/* use the common timing to make a try */
 	ret = pxa3xx_nand_config_flash(info, &builtin_flash_types[0]);
 	if (ret)
 		return ret;
 
+	/* use the common timing to make a try */
+	timings = onfi_async_timing_mode_to_sdr_timings(0);
+	if (IS_ERR(timings))
+		return PTR_ERR(timings);
+
+	pxa3xx_nand_set_timing(host, timings);
+
 	chip->cmdfunc(mtd, NAND_CMD_RESET, 0, 0);
 	ret = chip->waitfunc(mtd, chip);
 	if (ret & NAND_STATUS_FAIL)
@@ -1420,6 +1452,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
 	struct pxa3xx_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
 	struct nand_flash_dev pxa3xx_flash_ids[2], *def = NULL;
 	const struct pxa3xx_nand_flash *f = NULL;
+	const struct nand_sdr_timings *timings;
 	struct nand_chip *chip = mtd->priv;
 	uint32_t id = -1;
 	uint64_t chipsize;
@@ -1432,7 +1465,7 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
 	/* Set a default chunk size */
 	info->chunk_size = 512;
 
-	ret = pxa3xx_nand_sensing(info);
+	ret = pxa3xx_nand_sensing(host);
 	if (ret) {
 		dev_info(&info->pdev->dev, "There is no chip on cs %d!\n",
 			 info->cs);
@@ -1498,6 +1531,10 @@ KEEP_CONFIG:
 	if (nand_scan_ident(mtd, 1, def))
 		return -ENODEV;
 
+	ret = pxa3xx_nand_init_timings(host);
+	if (ret)
+		dev_err(&info->pdev->dev, "Failed to set timings: %d\n", ret);
+
 	if (pdata->flash_bbt) {
 		/*
 		 * We'll use a bad block table stored in-flash and don't
diff --git a/include/linux/platform_data/mtd-nand-pxa3xx.h b/include/linux/platform_data/mtd-nand-pxa3xx.h
index ac4ea2e641c7..27d8f6354c2a 100644
--- a/include/linux/platform_data/mtd-nand-pxa3xx.h
+++ b/include/linux/platform_data/mtd-nand-pxa3xx.h
@@ -24,8 +24,6 @@ struct pxa3xx_nand_flash {
 	unsigned int	flash_width;	/* Width of Flash memory (DWIDTH_M) */
 	unsigned int	dfc_width;	/* Width of flash controller(DWIDTH_C) */
 	unsigned int	num_blocks;	/* Number of physical blocks in Flash */
-
-	struct pxa3xx_nand_timing *timing;	/* NAND Flash timing */
 };
 
 /*
-- 
2.3.1




More information about the linux-mtd mailing list