summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorAdrian Hunter <adrian.hunter@nokia.com>2011-02-07 10:47:00 +0200
committerTony Lindgren <tony@atomide.com>2011-02-17 15:44:46 -0800
commit5714b7ed6b3e3c00c0d4719bb66757e64c30ecf6 (patch)
treeaaf57838fa11ca7b9c6a4bb5da80b57a5597dfdb
parent3ad2d861362031dac8b2bba78a8f4c575300948f (diff)
downloadtalos-op-linux-5714b7ed6b3e3c00c0d4719bb66757e64c30ecf6.tar.gz
talos-op-linux-5714b7ed6b3e3c00c0d4719bb66757e64c30ecf6.zip
OMAP: OneNAND: let boards determine OneNAND frequency
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 <adrian.hunter@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
-rw-r--r--arch/arm/mach-omap2/gpmc-onenand.c80
-rw-r--r--arch/arm/plat-omap/include/plat/onenand.h8
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 46786a606e90..d776ded9830d 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 86118dc3f19a..cbe897ca7f9e 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;
OpenPOWER on IntegriCloud