[PATCH v8 4/6] ARM: OMAP2+: onenand: refactor for clarity
Afzal Mohammed
afzal at ti.com
Fri Oct 5 11:39:35 EDT 2012
Refactor set_async_mode & set_sync_mode functions to
separate out timing calculation & actual configuration
(GPMC & OneNAND side).
Thanks to Jon for his suggestions.
Signed-off-by: Afzal Mohammed <afzal at ti.com>
Reviewed-by: Jon Hunter <jon-hunter at ti.com>
---
arch/arm/mach-omap2/gpmc-onenand.c | 174 +++++++++++++++++++++++--------------
1 file changed, 109 insertions(+), 65 deletions(-)
diff --git a/arch/arm/mach-omap2/gpmc-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c
index 3b61544..e1328f5 100644
--- a/arch/arm/mach-omap2/gpmc-onenand.c
+++ b/arch/arm/mach-omap2/gpmc-onenand.c
@@ -16,6 +16,7 @@
#include <linux/mtd/onenand_regs.h>
#include <linux/io.h>
#include <linux/platform_data/mtd-onenand-omap2.h>
+#include <linux/err.h>
#include <asm/mach/flash.h>
@@ -25,6 +26,14 @@
#define ONENAND_IO_SIZE SZ_128K
+#define ONENAND_FLAG_SYNCREAD (1 << 0)
+#define ONENAND_FLAG_SYNCWRITE (1 << 1)
+#define ONENAND_FLAG_HF (1 << 2)
+#define ONENAND_FLAG_VHF (1 << 3)
+
+static unsigned onenand_flags;
+static unsigned latency;
+
static struct omap_onenand_platform_data *gpmc_onenand_data;
static struct resource gpmc_onenand_resource = {
@@ -38,11 +47,9 @@ static struct platform_device gpmc_onenand_device = {
.resource = &gpmc_onenand_resource,
};
-static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base)
+static struct gpmc_timings omap2_onenand_calc_async_timings(void)
{
struct gpmc_timings t;
- u32 reg;
- int err;
const int t_cer = 15;
const int t_avdp = 12;
@@ -55,11 +62,6 @@ static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base)
const int t_wpl = 40;
const int t_wph = 30;
- /* Ensure sync read and sync write are disabled */
- reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
- reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE;
- writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
-
memset(&t, 0, sizeof(t));
t.sync_clk = 0;
t.cs_on = 0;
@@ -86,25 +88,30 @@ static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base)
t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
t.wr_cycle = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);
+ return t;
+}
+
+static int gpmc_set_async_mode(int cs, struct gpmc_timings *t)
+{
/* Configure GPMC for asynchronous read */
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
GPMC_CONFIG1_DEVICESIZE_16 |
GPMC_CONFIG1_MUXADDDATA);
- err = gpmc_cs_set_timings(cs, &t);
- if (err)
- return err;
+ return gpmc_cs_set_timings(cs, t);
+}
+
+static void omap2_onenand_set_async_mode(void __iomem *onenand_base)
+{
+ u32 reg;
/* Ensure sync read and sync write are disabled */
reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE;
writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
-
- return 0;
}
-static void set_onenand_cfg(void __iomem *onenand_base, int latency,
- int sync_read, int sync_write, int hf, int vhf)
+static void set_onenand_cfg(void __iomem *onenand_base)
{
u32 reg;
@@ -112,19 +119,19 @@ static void set_onenand_cfg(void __iomem *onenand_base, int latency,
reg &= ~((0x7 << ONENAND_SYS_CFG1_BRL_SHIFT) | (0x7 << 9));
reg |= (latency << ONENAND_SYS_CFG1_BRL_SHIFT) |
ONENAND_SYS_CFG1_BL_16;
- if (sync_read)
+ if (onenand_flags & ONENAND_FLAG_SYNCREAD)
reg |= ONENAND_SYS_CFG1_SYNC_READ;
else
reg &= ~ONENAND_SYS_CFG1_SYNC_READ;
- if (sync_write)
+ if (onenand_flags & ONENAND_FLAG_SYNCWRITE)
reg |= ONENAND_SYS_CFG1_SYNC_WRITE;
else
reg &= ~ONENAND_SYS_CFG1_SYNC_WRITE;
- if (hf)
+ if (onenand_flags & ONENAND_FLAG_HF)
reg |= ONENAND_SYS_CFG1_HF;
else
reg &= ~ONENAND_SYS_CFG1_HF;
- if (vhf)
+ if (onenand_flags & ONENAND_FLAG_VHF)
reg |= ONENAND_SYS_CFG1_VHF;
else
reg &= ~ONENAND_SYS_CFG1_VHF;
@@ -172,9 +179,9 @@ static int omap2_onenand_get_freq(struct omap_onenand_platform_data *cfg,
return freq;
}
-static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
- void __iomem *onenand_base,
- int *freq_ptr)
+static struct gpmc_timings
+omap2_onenand_calc_sync_timings(struct omap_onenand_platform_data *cfg,
+ int freq, bool clk_dep)
{
struct gpmc_timings t;
const int t_cer = 15;
@@ -184,29 +191,14 @@ static int omap2_onenand_set_sync_mode(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;
- int div, fclk_offset_ns, fclk_offset, gpmc_clk_ns, latency;
- int first_time = 0, hf = 0, vhf = 0, sync_read = 0, sync_write = 0;
- 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;
- } else if (cfg->flags & ONENAND_SYNC_READWRITE) {
- sync_read = 1;
- sync_write = 1;
- } else
- return omap2_onenand_set_async_mode(cs, onenand_base);
+ int div, fclk_offset_ns, fclk_offset, gpmc_clk_ns;
+ int ticks_cez;
+ int cs = cfg->cs;
- if (!freq) {
- /* Very first call freq is not known */
- err = omap2_onenand_set_async_mode(cs, onenand_base);
- if (err)
- return err;
- freq = omap2_onenand_get_freq(cfg, onenand_base, &clk_dep);
- first_time = 1;
- }
+ if (cfg->flags & ONENAND_SYNC_READ)
+ onenand_flags = ONENAND_FLAG_SYNCREAD;
+ else if (cfg->flags & ONENAND_SYNC_READWRITE)
+ onenand_flags = ONENAND_FLAG_SYNCREAD | ONENAND_FLAG_SYNCWRITE;
switch (freq) {
case 104:
@@ -244,19 +236,23 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
t_ach = 9;
t_aavdh = 7;
t_rdyo = 15;
- sync_write = 0;
+ onenand_flags &= ~ONENAND_FLAG_SYNCWRITE;
break;
}
div = gpmc_cs_calc_divider(cs, min_gpmc_clk_period);
gpmc_clk_ns = gpmc_ticks_to_ns(div);
if (gpmc_clk_ns < 15) /* >66Mhz */
- hf = 1;
+ onenand_flags |= ONENAND_FLAG_HF;
+ else
+ onenand_flags &= ~ONENAND_FLAG_HF;
if (gpmc_clk_ns < 12) /* >83Mhz */
- vhf = 1;
- if (vhf)
+ onenand_flags |= ONENAND_FLAG_VHF;
+ else
+ onenand_flags &= ~ONENAND_FLAG_VHF;
+ if (onenand_flags & ONENAND_FLAG_VHF)
latency = 8;
- else if (hf)
+ else if (onenand_flags & ONENAND_FLAG_HF)
latency = 6;
else if (gpmc_clk_ns >= 25) /* 40 MHz*/
latency = 3;
@@ -279,9 +275,8 @@ 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, vhf);
+ /* Set synchronous read timings */
+ memset(&t, 0, sizeof(t));
if (div == 1) {
t.bool_timings.cs_extra_delay = true;
@@ -290,8 +285,6 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
t.bool_timings.we_extra_delay = true;
}
- /* Set synchronous read timings */
- memset(&t, 0, sizeof(t));
t.sync_clk = min_gpmc_clk_period;
t.cs_on = 0;
t.adv_on = 0;
@@ -315,7 +308,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
t.clk_activation = fclk_offset_ns;
/* Write */
- if (sync_write) {
+ if (onenand_flags & ONENAND_FLAG_SYNCWRITE) {
t.adv_wr_off = t.adv_rd_off;
t.we_on = 0;
t.we_off = t.cs_rd_off;
@@ -340,6 +333,14 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
}
}
+ return t;
+}
+
+static int gpmc_set_sync_mode(int cs, struct gpmc_timings *t)
+{
+ unsigned sync_read = onenand_flags & ONENAND_FLAG_SYNCREAD;
+ unsigned sync_write = onenand_flags & ONENAND_FLAG_SYNCWRITE;
+
/* Configure GPMC for synchronous read */
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
GPMC_CONFIG1_WRAPBURST_SUPP |
@@ -355,11 +356,47 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
GPMC_CONFIG1_DEVICETYPE_NOR |
GPMC_CONFIG1_MUXADDDATA);
- err = gpmc_cs_set_timings(cs, &t);
- if (err)
- return err;
+ return gpmc_cs_set_timings(cs, t);
+}
+
+static int omap2_onenand_setup_async(void __iomem *onenand_base)
+{
+ struct gpmc_timings t;
+ int ret;
+
+ omap2_onenand_set_async_mode(onenand_base);
+
+ t = omap2_onenand_calc_async_timings();
+
+ ret = gpmc_set_async_mode(gpmc_onenand_data->cs, &t);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ omap2_onenand_set_async_mode(onenand_base);
+
+ return 0;
+}
+
+static int omap2_onenand_setup_sync(void __iomem *onenand_base, int *freq_ptr)
+{
+ int ret, freq = *freq_ptr;
+ struct gpmc_timings t;
+ bool clk_dep = false;
+
+ if (!freq) {
+ /* Very first call freq is not known */
+ freq = omap2_onenand_get_freq(gpmc_onenand_data,
+ onenand_base, &clk_dep);
+ set_onenand_cfg(onenand_base);
+ }
+
+ t = omap2_onenand_calc_sync_timings(gpmc_onenand_data, freq, clk_dep);
- set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf, vhf);
+ ret = gpmc_set_sync_mode(gpmc_onenand_data->cs, &t);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+
+ set_onenand_cfg(onenand_base);
*freq_ptr = freq;
@@ -369,15 +406,22 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
static int gpmc_onenand_setup(void __iomem *onenand_base, int *freq_ptr)
{
struct device *dev = &gpmc_onenand_device.dev;
+ unsigned l = ONENAND_SYNC_READ | ONENAND_SYNC_READWRITE;
+ int ret;
- /* Set sync timings in GPMC */
- if (omap2_onenand_set_sync_mode(gpmc_onenand_data, onenand_base,
- freq_ptr) < 0) {
- dev_err(dev, "Unable to set synchronous mode\n");
- return -EINVAL;
+ ret = omap2_onenand_setup_async(onenand_base);
+ if (ret) {
+ dev_err(dev, "unable to set to async mode\n");
+ return ret;
}
- return 0;
+ if (!(gpmc_onenand_data->flags & l))
+ return 0;
+
+ ret = omap2_onenand_setup_sync(onenand_base, freq_ptr);
+ if (ret)
+ dev_err(dev, "unable to set to sync mode\n");
+ return ret;
}
void __init gpmc_onenand_init(struct omap_onenand_platform_data *_onenand_data)
--
1.7.12
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