ARM: OMAP3+: voltage: use oscillator data to calculate setup times

We now use the previously defined oscillator setup / shutdown times
to calculate the register values for CLKSETUP.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c
index 07e2090d7119..5d5f9e52f89f 100644
--- a/arch/arm/mach-omap2/vc.c
+++ b/arch/arm/mach-omap2/vc.c
@@ -11,13 +11,19 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/bug.h>
+#include <linux/io.h>
 
+#include <asm/div64.h>
+
+#include "iomap.h"
 #include "soc.h"
 #include "voltage.h"
 #include "vc.h"
 #include "prm-regbits-34xx.h"
 #include "prm-regbits-44xx.h"
 #include "prm44xx.h"
+#include "pm.h"
+#include "scrm44xx.h"
 
 /**
  * struct omap_vc_channel_cfg - describe the cfg_channel bitfield
@@ -204,6 +210,18 @@ int omap_vc_bypass_scale(struct voltagedomain *voltdm,
         return 0;
 }
 
+/* Convert microsecond value to number of 32kHz clock cycles */
+static inline u32 omap_usec_to_32k(u32 usec)
+{
+        return DIV_ROUND_UP_ULL(32768ULL * (u64)usec, 1000000ULL);
+}
+
+/* Set oscillator setup time for omap3 */
+static void omap3_set_clksetup(u32 usec, struct voltagedomain *voltdm)
+{
+        voltdm->write(omap_usec_to_32k(usec), OMAP3_PRM_CLKSETUP_OFFSET);
+}
+
 /**
  * omap3_set_i2c_timings - sets i2c sleep timings for a channel
  * @voltdm: channel to configure
@@ -220,6 +238,12 @@ static void omap3_set_i2c_timings(struct voltagedomain *voltdm, bool off_mode)
         unsigned long voltsetup1;
         u32 tgt_volt;
 
+        /*
+         * Oscillator is shut down only if we are using sys_off_mode pad,
+         * thus we set a minimal setup time here
+         */
+        omap3_set_clksetup(1, voltdm);
+
         if (off_mode)
                 tgt_volt = voltdm->vc_param->off;
         else
@@ -260,6 +284,7 @@ static void omap3_set_off_timings(struct voltagedomain *voltdm)
         unsigned long voltsetup2;
         unsigned long voltsetup2_old;
         u32 val;
+        u32 tstart, tshut;
 
         /* check if sys_off_mode is used to control off-mode voltages */
         val = voltdm->read(OMAP3_PRM_VOLTCTRL_OFFSET);
@@ -269,6 +294,9 @@ static void omap3_set_off_timings(struct voltagedomain *voltdm)
                 return;
         }
 
+        omap_pm_get_oscillator(&tstart, &tshut);
+        omap3_set_clksetup(tstart, voltdm);
+
         clksetup = voltdm->read(OMAP3_PRM_CLKSETUP_OFFSET);
 
         /* voltsetup 2 in us */
@@ -365,6 +393,30 @@ static u32 omap4_calc_volt_ramp(struct voltagedomain *voltdm, u32 voltage_diff)
 }
 
 /**
+ * omap4_usec_to_val_scrm - convert microsecond value to SCRM module bitfield
+ * @usec: microseconds
+ * @shift: number of bits to shift left
+ * @mask: bitfield mask
+ *
+ * Converts microsecond value to OMAP4 SCRM bitfield. Bitfield is
+ * shifted to requested position, and checked agains the mask value.
+ * If larger, forced to the max value of the field (i.e. the mask itself.)
+ * Returns the SCRM bitfield value.
+ */
+static u32 omap4_usec_to_val_scrm(u32 usec, int shift, u32 mask)
+{
+        u32 val;
+
+        val = omap_usec_to_32k(usec) << shift;
+
+        /* Check for overflow, if yes, force to max value */
+        if (val > mask)
+                val = mask;
+
+        return val;
+}
+
+/**
  * omap4_set_timings - set voltage ramp timings for a channel
  * @voltdm: channel to configure
  * @off_mode: whether off-mode values are used
@@ -376,6 +428,7 @@ static void omap4_set_timings(struct voltagedomain *voltdm, bool off_mode)
         u32 val;
         u32 ramp;
         int offset;
+        u32 tstart, tshut;
 
         if (off_mode) {
                 ramp = omap4_calc_volt_ramp(voltdm,
@@ -397,6 +450,15 @@ static void omap4_set_timings(struct voltagedomain *voltdm, bool off_mode)
         val |= ramp << OMAP4430_RAMP_UP_COUNT_SHIFT;
 
         voltdm->write(val, offset);
+
+        omap_pm_get_oscillator(&tstart, &tshut);
+
+        val = omap4_usec_to_val_scrm(tstart, OMAP4_SETUPTIME_SHIFT,
+                OMAP4_SETUPTIME_MASK);
+        val |= omap4_usec_to_val_scrm(tshut, OMAP4_DOWNTIME_SHIFT,
+                OMAP4_DOWNTIME_MASK);
+
+        __raw_writel(val, OMAP4_SCRM_CLKSETUPTIME);
 }
 
 /* OMAP4 specific voltage init functions */