From mboxrd@z Thu Jan 1 00:00:00 1970 From: leiwen@marvell.com (Lei Wen) Date: Tue, 8 Jun 2010 12:13:08 +0800 Subject: [PATCH 20/25] pxa3xx_nand: add advanced timing tuning feature Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org For new controller, it has more power at more precise timing tuning. Signed-off-by: Lei Wen --- drivers/mtd/nand/pxa3xx_nand.c | 93 ++++++++++++++++++++++++++++------------ 1 files changed, 65 insertions(+), 28 deletions(-) diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c index 04bf875..834422d 100644 --- a/drivers/mtd/nand/pxa3xx_nand.c +++ b/drivers/mtd/nand/pxa3xx_nand.c @@ -165,6 +165,7 @@ enum { }; struct pxa3xx_nand_timing { + uint32_t tADL; /* Adress to Write Data delay */ uint32_t tCH; /* Enable signal hold time */ uint32_t tCS; /* Enable signal setup time */ uint32_t tWH; /* ND_nWE high duration */ @@ -172,6 +173,7 @@ struct pxa3xx_nand_timing { uint32_t tRH; /* ND_nRE high duration */ uint32_t tRP; /* ND_nRE pulse width */ uint32_t tR; /* ND_nWE high to ND_nRE low for read */ + uint32_t tRHW; /* delay for next command issue */ uint32_t tWHR; /* ND_nWE high to ND_nRE low for status read */ uint32_t tAR; /* ND_ALE low to ND_nRE low delay */ }; @@ -287,13 +289,13 @@ 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, }, + { 0, 40, 80, 60, 100, 80, 100, 90000, 0, 400, 40, }, /* Samsung NAND series */ - { 10, 0, 20, 40, 30, 40, 11123, 110, 10, }, + { 200, 10, 15, 20, 40, 30, 40, 11123, 20, 110, 10, }, /* Micron NAND series */ - { 10, 25, 15, 25, 15, 30, 25000, 60, 10, }, + { 0, 10, 25, 15, 25, 15, 30, 25000, 0, 60, 10, }, /* ST NAND series */ - { 10, 35, 15, 25, 15, 25, 25000, 60, 10, }, + { 0, 10, 35, 15, 25, 15, 25, 25000, 0, 60, 10, }, }; static struct pxa3xx_nand_flash __devinitdata builtin_flash_types[] = { @@ -312,16 +314,20 @@ static struct pxa3xx_nand_flash __devinitdata builtin_flash_types[] = { static const char *mtd_names[] = {"pxa3xx_nand-0", "pxa3xx_nand-1", NULL}; -#define NDTR0_tCH(c) (min((c), 7) << 19) -#define NDTR0_tCS(c) (min((c), 7) << 16) -#define NDTR0_tWH(c) (min((c), 7) << 11) -#define NDTR0_tWP(c) (min((c), 7) << 8) -#define NDTR0_tRH(c) (min((c), 7) << 3) -#define NDTR0_tRP(c) (min((c), 7) << 0) - -#define NDTR1_tR(c) (min((c), 65535) << 16) -#define NDTR1_tWHR(c) (min((c), 15) << 4) -#define NDTR1_tAR(c) (min((c), 15) << 0) +#define NDTR0_tADL(c) (min_t(uint32_t, (c), 31) << 27) +#define NDTR0_tCH(c) (min_t(uint32_t, (c), 7) << 19) +#define NDTR0_tCS(c) (min_t(uint32_t, (c), 7) << 16) +#define NDTR0_tWH(c) (min_t(uint32_t, (c), 7) << 11) +#define NDTR0_tWP(c) (min_t(uint32_t, (c), 7) << 8) +#define NDTR0_ETRP (0x1 << 6) +#define NDTR0_tRH(c) (min_t(uint32_t, (c), 7) << 3) +#define NDTR0_tRP(c) (min_t(uint32_t, (c), 7) << 0) + +#define NDTR1_tR(c) (min_t(uint32_t, (c), 65535) << 16) +#define NDTR1_PRESCALE (0x1 << 14) +#define NDTR1_tRHW(c) (min_t(uint32_t, (c), 3) << 8) +#define NDTR1_tWHR(c) (min_t(uint32_t, (c), 15) << 4) +#define NDTR1_tAR(c) (min_t(uint32_t, (c), 15) << 0) /* convert nano-seconds to nand flash controller clock cycles */ #define ns2cycle(ns, clk) (int)((ns) * (clk / 1000000) / 1000) @@ -329,20 +335,51 @@ static void pxa3xx_nand_set_timing(struct pxa3xx_nand_info *info, const struct pxa3xx_nand_timing *t) { struct pxa3xx_nand *nand = info->nand_data; - unsigned long nand_clk; - uint32_t ndtr0, ndtr1; - - nand_clk = clk_get_rate(nand->clk); - 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)); + struct platform_device *pdev = nand->pdev; + struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data; + unsigned long nand_clk = clk_get_rate(nand->clk); + uint32_t ndtr0, ndtr1, tRP, tR, tRHW, tADL; + + tR = ns2cycle(t->tR, nand_clk); + tRP = ns2cycle(t->tRP, nand_clk); + tRHW = tADL = ndtr0 = ndtr1 = 0; + if (pdata->controller_attrs & PXA3XX_NAKED_CMD_EN) + tR = 0; + if (pdata->controller_attrs & PXA3XX_ADV_TIME_TUNING) { + if (tRP > 0x7) { + ndtr0 |= NDTR0_ETRP; + tRP -= 0x7; + } + if (tR > 0xffff) { + ndtr1 |= NDTR1_PRESCALE; + tR /= 16; + } + if (t->tRHW > 0) { + tRHW = ns2cycle(t->tRHW, nand_clk); + if (tRHW < 16) + tRHW = 1; + else { + if (tRHW < 32) + tRHW = 2; + else + tRHW = 3; + } + } + tADL = ns2cycle(t->tADL, nand_clk); + } + + ndtr0 |= NDTR0_tADL(tADL) + | 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(tRP); + + ndtr1 |= NDTR1_tR(tR) + | NDTR1_tRHW(tRHW) + | NDTR1_tWHR(ns2cycle(t->tWHR, nand_clk)) + | NDTR1_tAR(ns2cycle(t->tAR, nand_clk)); info->ndtr0cs0 = ndtr0; info->ndtr1cs0 = ndtr1; -- 1.7.0.4