[PATCH 1/4] OMAP: OneNAND: fix 104MHz support
Adrian Hunter
adrian.hunter at nokia.com
Mon Feb 7 03:46:58 EST 2011
104MHz needs a latency of 8 clock cycles and the VHF
flag must be set. Also t_rdyo is specified as
"not applicable" so pick a lower value, and force at
least 1 clk between AVD High to OE Low.
Signed-off-by: Adrian Hunter <adrian.hunter at nokia.com>
---
arch/arm/mach-omap2/gpmc-onenand.c | 23 +++++++++++++++++------
include/linux/mtd/onenand_regs.h | 1 +
2 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/arch/arm/mach-omap2/gpmc-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c
index 3a7d25f..3a4307b 100644
--- a/arch/arm/mach-omap2/gpmc-onenand.c
+++ b/arch/arm/mach-omap2/gpmc-onenand.c
@@ -94,7 +94,7 @@ static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base)
}
static void set_onenand_cfg(void __iomem *onenand_base, int latency,
- int sync_read, int sync_write, int hf)
+ int sync_read, int sync_write, int hf, int vhf)
{
u32 reg;
@@ -114,6 +114,10 @@ static void set_onenand_cfg(void __iomem *onenand_base, int latency,
reg |= ONENAND_SYS_CFG1_HF;
else
reg &= ~ONENAND_SYS_CFG1_HF;
+ if (vhf)
+ reg |= ONENAND_SYS_CFG1_VHF;
+ else
+ reg &= ~ONENAND_SYS_CFG1_VHF;
writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
}
@@ -130,7 +134,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
const int t_wph = 30;
int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo;
int tick_ns, div, fclk_offset_ns, fclk_offset, gpmc_clk_ns, latency;
- int first_time = 0, hf = 0, sync_read = 0, sync_write = 0;
+ int first_time = 0, hf = 0, vhf = 0, sync_read = 0, sync_write = 0;
int err, ticks_cez;
int cs = cfg->cs;
u32 reg;
@@ -180,7 +184,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
t_avdh = 2;
t_ach = 3;
t_aavdh = 6;
- t_rdyo = 9;
+ t_rdyo = 6;
break;
case 83:
min_gpmc_clk_period = 12000; /* 83 MHz */
@@ -217,7 +221,11 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
gpmc_clk_ns = gpmc_ticks_to_ns(div);
if (gpmc_clk_ns < 15) /* >66Mhz */
hf = 1;
- if (hf)
+ if (gpmc_clk_ns < 12) /* >83Mhz */
+ vhf = 1;
+ if (vhf)
+ latency = 8;
+ else if (hf)
latency = 6;
else if (gpmc_clk_ns >= 25) /* 40 MHz*/
latency = 3;
@@ -226,7 +234,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
if (first_time)
set_onenand_cfg(onenand_base, latency,
- sync_read, sync_write, hf);
+ sync_read, sync_write, hf, vhf);
if (div == 1) {
reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
@@ -264,6 +272,9 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
/* Read */
t.adv_rd_off = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_avdh));
t.oe_on = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_ach));
+ /* Force at least 1 clk between AVD High to OE Low */
+ if (t.oe_on <= t.adv_rd_off)
+ t.oe_on = t.adv_rd_off + gpmc_round_ns_to_ticks(1);
t.access = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div);
t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
t.cs_rd_off = t.oe_off;
@@ -317,7 +328,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
if (err)
return err;
- set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf);
+ set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf, vhf);
return 0;
}
diff --git a/include/linux/mtd/onenand_regs.h b/include/linux/mtd/onenand_regs.h
index cd6f3b4..d60130f 100644
--- a/include/linux/mtd/onenand_regs.h
+++ b/include/linux/mtd/onenand_regs.h
@@ -168,6 +168,7 @@
#define ONENAND_SYS_CFG1_INT (1 << 6)
#define ONENAND_SYS_CFG1_IOBE (1 << 5)
#define ONENAND_SYS_CFG1_RDY_CONF (1 << 4)
+#define ONENAND_SYS_CFG1_VHF (1 << 3)
#define ONENAND_SYS_CFG1_HF (1 << 2)
#define ONENAND_SYS_CFG1_SYNC_WRITE (1 << 1)
--
1.7.0.4
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