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ARM: OMAP2+: gpmc: handle additional timings

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Configure busturnaround, cycle2cycledelay, waitmonitoringtime,
clkactivationtime in gpmc_cs_set_timings(). This is done so
that boards can configure these parameters of gpmc in Kernel
instead of relying on bootloader. Also configure bool type
timings like extradelay.

This needed change to the existing users that were configuring
clk activation time and extra delay by directly writing to
registers. Thanks to Tony for making me aware of users of clk
activation and being kind enough to test the modified one.

Signed-off-by: Afzal Mohammed <afzal@ti.com>
This commit is contained in:
Afzal Mohammed
2012-05-28 17:51:37 +05:30
parent a1bfdc6020
commit 559d94b00c
4 changed files with 75 additions and 25 deletions
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30
arch/arm/mach-omap2/gpmc-onenand.c
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@@ -181,10 +181,8 @@ omap2_onenand_calc_sync_timings(struct omap_onenand_platform_data *cfg,
const int t_wpl = 40;
const int t_wph = 30;
int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo;
u32 reg;
int div, fclk_offset_ns, gpmc_clk_ns;
int ticks_cez;
int cs = cfg->cs;
if (cfg->flags & ONENAND_SYNC_READ)
onenand_flags = ONENAND_FLAG_SYNCREAD;
@@ -254,27 +252,10 @@ omap2_onenand_calc_sync_timings(struct omap_onenand_platform_data *cfg,
memset(&t, 0, sizeof(t));
if (div == 1) {
reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
reg |= (1 << 7);
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
reg |= (1 << 7);
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
reg |= (1 << 7);
reg |= (1 << 23);
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
} else {
reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
reg &= ~(1 << 7);
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
reg &= ~(1 << 7);
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
reg &= ~(1 << 7);
reg &= ~(1 << 23);
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
t.bool_timings.cs_extra_delay = true;
t.bool_timings.adv_extra_delay = true;
t.bool_timings.oe_extra_delay = true;
t.bool_timings.we_extra_delay = true;
}
t.sync_clk = min_gpmc_clk_period;
@@ -297,6 +278,8 @@ omap2_onenand_calc_sync_timings(struct omap_onenand_platform_data *cfg,
t.rd_cycle = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div +
ticks_cez);
t.clk_activation = fclk_offset_ns;
/* Write */
if (onenand_flags & ONENAND_FLAG_SYNCWRITE) {
t.adv_wr_off = t.adv_rd_off;
@@ -338,7 +321,6 @@ static int gpmc_set_sync_mode(int cs, struct gpmc_timings *t)
(sync_read ? GPMC_CONFIG1_READTYPE_SYNC : 0) |
(sync_write ? GPMC_CONFIG1_WRITEMULTIPLE_SUPP : 0) |
(sync_write ? GPMC_CONFIG1_WRITETYPE_SYNC : 0) |
GPMC_CONFIG1_CLKACTIVATIONTIME(fclk_offset) |
GPMC_CONFIG1_PAGE_LEN(2) |
(cpu_is_omap34xx() ? 0 :
(GPMC_CONFIG1_WAIT_READ_MON |