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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 /arch/arm/mach-omap2/gpmc-onenand.c
parent3ad2d861362031dac8b2bba78a8f4c575300948f (diff)
downloadtalos-op-linux-5714b7ed6b3e3c00c0d4719bb66757e64c30ecf6.tar.gz
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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>
Diffstat (limited to 'arch/arm/mach-omap2/gpmc-onenand.c')
-rw-r--r--arch/arm/mach-omap2/gpmc-onenand.c80
1 files changed, 59 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);
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