This patch modifies the math used to convert clock ticks to nanoseconds
so that it is aware of the effect of the TIMEPARAGRANULARITY flag which
acts as a divide by 2 to the GPMC timing registers. This enables the use
of slower devices on the GPMC bus.
---
arch/arm/mach-omap2/gpmc.c | 11 +++++++----
1 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 5bc3ca0..6c3a786 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -171,12 +171,15 @@ static int set_gpmc_timing_reg(int cs, int reg, int
st_bit, int end_bit,
#endif
{
u32 l;
- int ticks, mask, nr_bits;
+ int ticks, mask, nr_bits, para_gran;
+
+ para_gran = (gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1) &
+ GPMC_CONFIG1_TIME_PARA_GRAN ? 2:1);
if (time == 0)
ticks = 0;
else
- ticks = gpmc_ns_to_ticks(time);
+ ticks = gpmc_ns_to_ticks(time/para_gran);
nr_bits = end_bit - st_bit + 1;
if (ticks >= 1 << nr_bits) {
#ifdef DEBUG
@@ -191,8 +194,8 @@ static int set_gpmc_timing_reg(int cs, int reg, int st_bit,
int end_bit,
#ifdef DEBUG
printk(KERN_INFO
"GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
- cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
- (l >> st_bit) & mask, time);
+ cs, name, ticks, gpmc_get_fclk_period() * para_gran *
+ ticks / 1000, (l >> st_bit) & mask, time);
#endif
l &= ~(mask << st_bit);
l |= ticks << st_bit;
--
1.6.3.3
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