OMAP2/3: GPMC: put sync_clk value in picoseconds instead of nanoseconds

The calculations done with sync_clk are anyway in picoseconds
and switching to picoseconds allows sync_clk values that are
not a whole number of nanoseconds - which is sometimes the
case.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

5 files changed, 24 insertions, 13 deletions

diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
index 722209601927..2bb29c160702 100644
--- a/arch/arm/mach-omap2/gpmc-nand.c
+++ b/arch/arm/mach-omap2/gpmc-nand.c
@@ -41,7 +41,7 @@ static int omap2_nand_gpmc_retime(void)
                 return 0;
 
         memset(&t, 0, sizeof(t));
-        t.sync_clk = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->sync_clk);
+        t.sync_clk = gpmc_nand_data->gpmc_t->sync_clk;
         t.cs_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->cs_on);
         t.adv_on = gpmc_round_ns_to_ticks(gpmc_nand_data->gpmc_t->adv_on);
 
diff --git a/arch/arm/mach-omap2/gpmc-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c
index 7bb69220adfa..1db606ca007e 100644
--- a/arch/arm/mach-omap2/gpmc-onenand.c
+++ b/arch/arm/mach-omap2/gpmc-onenand.c
@@ -174,7 +174,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
 
         switch (freq) {
         case 83:
-                min_gpmc_clk_period = 12; /* 83 MHz */
+                min_gpmc_clk_period = 12000; /* 83 MHz */
                 t_ces   = 5;
                 t_avds  = 4;
                 t_avdh  = 2;
@@ -183,7 +183,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
                 t_rdyo  = 9;
                 break;
         case 66:
-                min_gpmc_clk_period = 15; /* 66 MHz */
+                min_gpmc_clk_period = 15000; /* 66 MHz */
                 t_ces   = 6;
                 t_avds  = 5;
                 t_avdh  = 2;
@@ -192,7 +192,7 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
                 t_rdyo  = 11;
                 break;
         default:
-                min_gpmc_clk_period = 18; /* 54 MHz */
+                min_gpmc_clk_period = 18500; /* 54 MHz */
                 t_ces   = 7;
                 t_avds  = 7;
                 t_avdh  = 7;
@@ -271,8 +271,8 @@ static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
                 t.wr_cycle  = t.rd_cycle;
                 if (cpu_is_omap34xx()) {
                         t.wr_data_mux_bus = gpmc_ticks_to_ns(fclk_offset +
-                                        gpmc_ns_to_ticks(min_gpmc_clk_period +
-                                        t_rdyo));
+                                        gpmc_ps_to_ticks(min_gpmc_clk_period +
+                                        t_rdyo * 1000));
                         t.wr_access = t.access;
                 }
         } else {
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index f46933bc9373..1b7b3e7d02f7 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -168,6 +168,16 @@ unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
         return (time_ns * 1000 + tick_ps - 1) / tick_ps;
 }
 
+unsigned int gpmc_ps_to_ticks(unsigned int time_ps)
+{
+        unsigned long tick_ps;
+
+        /* Calculate in picosecs to yield more exact results */
+        tick_ps = gpmc_get_fclk_period();
+
+        return (time_ps + tick_ps - 1) / tick_ps;
+}
+
 unsigned int gpmc_ticks_to_ns(unsigned int ticks)
 {
         return ticks * gpmc_get_fclk_period() / 1000;
@@ -235,7 +245,7 @@ int gpmc_cs_calc_divider(int cs, unsigned int sync_clk)
         int div;
         u32 l;
 
-        l = sync_clk * 1000 + (gpmc_get_fclk_period() - 1);
+        l = sync_clk + (gpmc_get_fclk_period() - 1);
         div = l / gpmc_get_fclk_period();
         if (div > 4)
                 return -1;
diff --git a/arch/arm/mach-omap2/usb-tusb6010.c b/arch/arm/mach-omap2/usb-tusb6010.c
index 64a0112b70a5..1e998ea40951 100644
--- a/arch/arm/mach-omap2/usb-tusb6010.c
+++ b/arch/arm/mach-omap2/usb-tusb6010.c
@@ -120,8 +120,8 @@ static int tusb_set_sync_mode(unsigned sysclk_ps, unsigned fclk_ps)
         t.adv_on = next_clk(t.cs_on, t_scsnh_advnh - 7000, fclk_ps);
 
         /* GPMC_CLK rate = fclk rate / div */
-        t.sync_clk = 12 /* 11.1 nsec */;
-        tmp = (t.sync_clk * 1000 + fclk_ps - 1) / fclk_ps;
+        t.sync_clk = 11100 /* 11.1 nsec */;
+        tmp = (t.sync_clk + fclk_ps - 1) / fclk_ps;
         if (tmp > 4)
                 return -ERANGE;
         if (tmp <= 0)
diff --git a/arch/arm/plat-omap/include/plat/gpmc.h b/arch/arm/plat-omap/include/plat/gpmc.h
index 9fd99b9e40ab..85ded598853e 100644
--- a/arch/arm/plat-omap/include/plat/gpmc.h
+++ b/arch/arm/plat-omap/include/plat/gpmc.h
@@ -80,12 +80,12 @@
 #define GPMC_PREFETCH_STATUS_COUNT(val) (val & 0x00003fff)
 
 /*
- * Note that all values in this struct are in nanoseconds, while
- * the register values are in gpmc_fck cycles.
+ * Note that all values in this struct are in nanoseconds except sync_clk
+ * (which is in picoseconds), while the register values are in gpmc_fck cycles.
  */
 struct gpmc_timings {
-        /* Minimum clock period for synchronous mode */
-        u16 sync_clk;
+        /* Minimum clock period for synchronous mode (in picoseconds) */
+        u32 sync_clk;
 
         /* Chip-select signal timings corresponding to GPMC_CS_CONFIG2 */
         u16 cs_on;              /* Assertion time */
@@ -117,6 +117,7 @@ struct gpmc_timings {
 };
 
 extern unsigned int gpmc_ns_to_ticks(unsigned int time_ns);
+extern unsigned int gpmc_ps_to_ticks(unsigned int time_ps);
 extern unsigned int gpmc_ticks_to_ns(unsigned int ticks);
 extern unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns);
 extern unsigned long gpmc_get_fclk_period(void);