OneNAND version ID may not give the highest frequency supported and some OneNAND's have setup times that are clock dependent. Let the board provide that information.
Signed-off-by: Adrian Hunter <[email protected]> --- arch/arm/mach-omap2/gpmc-onenand.c | 80 +++++++++++++++++++++-------- arch/arm/plat-omap/include/plat/onenand.h | 8 +++ 2 files changed, 67 insertions(+), 21 deletions(-) diff --git a/arch/arm/mach-omap2/gpmc-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c index 46786a6..d776ded 100644 --- a/arch/arm/mach-omap2/gpmc-onenand.c +++ b/arch/arm/mach-omap2/gpmc-onenand.c @@ -121,6 +121,47 @@ static void set_onenand_cfg(void __iomem *onenand_base, int latency, writew(reg, onenand_base + ONENAND_REG_SYS_CFG1); } +static int omap2_onenand_get_freq(struct omap_onenand_platform_data *cfg, + void __iomem *onenand_base, bool *clk_dep) +{ + u16 ver = readw(onenand_base + ONENAND_REG_VERSION_ID); + int freq = 0; + + if (cfg->get_freq) { + struct onenand_freq_info fi; + + fi.maf_id = readw(onenand_base + ONENAND_REG_MANUFACTURER_ID); + fi.dev_id = readw(onenand_base + ONENAND_REG_DEVICE_ID); + fi.ver_id = ver; + freq = cfg->get_freq(&fi, clk_dep); + if (freq) + return freq; + } + + switch ((ver >> 4) & 0xf) { + case 0: + freq = 40; + break; + case 1: + freq = 54; + break; + case 2: + freq = 66; + break; + case 3: + freq = 83; + break; + case 4: + freq = 104; + break; + default: + freq = 54; + break; + } + + return freq; +} + static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg, void __iomem *onenand_base, int *freq_ptr) @@ -138,6 +179,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg, int err, ticks_cez; int cs = cfg->cs, freq = *freq_ptr; u32 reg; + bool clk_dep = false; if (cfg->flags & ONENAND_SYNC_READ) { sync_read = 1; @@ -152,27 +194,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg, err = omap2_onenand_set_async_mode(cs, onenand_base); if (err) return err; - reg = readw(onenand_base + ONENAND_REG_VERSION_ID); - switch ((reg >> 4) & 0xf) { - case 0: - freq = 40; - break; - case 1: - freq = 54; - break; - case 2: - freq = 66; - break; - case 3: - freq = 83; - break; - case 4: - freq = 104; - break; - default: - freq = 54; - break; - } + freq = omap2_onenand_get_freq(cfg, onenand_base, &clk_dep); first_time = 1; } @@ -232,6 +254,22 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg, else latency = 4; + if (clk_dep) { + if (gpmc_clk_ns < 12) { /* >83Mhz */ + t_ces = 3; + t_avds = 4; + } else if (gpmc_clk_ns < 15) { /* >66Mhz */ + t_ces = 5; + t_avds = 4; + } else if (gpmc_clk_ns < 25) { /* >40Mhz */ + t_ces = 6; + t_avds = 5; + } else { + t_ces = 7; + t_avds = 7; + } + } + if (first_time) set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf, vhf); diff --git a/arch/arm/plat-omap/include/plat/onenand.h b/arch/arm/plat-omap/include/plat/onenand.h index 86118dc..cbe897c 100644 --- a/arch/arm/plat-omap/include/plat/onenand.h +++ b/arch/arm/plat-omap/include/plat/onenand.h @@ -15,12 +15,20 @@ #define ONENAND_SYNC_READ (1 << 0) #define ONENAND_SYNC_READWRITE (1 << 1) +struct onenand_freq_info { + u16 maf_id; + u16 dev_id; + u16 ver_id; +}; + struct omap_onenand_platform_data { int cs; int gpio_irq; struct mtd_partition *parts; int nr_parts; int (*onenand_setup)(void __iomem *, int *freq_ptr); + int (*get_freq)(const struct onenand_freq_info *freq_info, + bool *clk_dep); int dma_channel; u8 flags; u8 regulator_can_sleep; -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
