[PATCHv4 07/15] omap3+: voltage: use oscillator data to calculate setup times

[Tero Kristo]

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

Signed-off-by: Tero Kristo <t-kri...@ti.com>
---
 arch/arm/mach-omap2/vc.c |   46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 46 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c
index 8384b70..351319c 100644
--- a/arch/arm/mach-omap2/vc.c
+++ b/arch/arm/mach-omap2/vc.c
@@ -13,6 +13,8 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 
+#include <asm/div64.h>
+
 #include <plat/cpu.h>
 #include <plat/prcm.h>
 
@@ -22,6 +24,7 @@
 #include "prm-regbits-44xx.h"
 #include "prm44xx.h"
 #include "scrm44xx.h"
+#include "pm.h"
 
 /**
  * struct omap_vc_channel_cfg - describe the cfg_channel bitfield
@@ -209,11 +212,27 @@ int omap_vc_bypass_scale(struct voltagedomain *voltdm,
        return 0;
 }
 
+static u32 omap_usec_to_32k(u32 usec)
+{
+       /* DIV_ROUND_UP expanded to 64bit to avoid overflow */
+       u64 val = 32768ULL * (u64)usec + 1000000ULL - 1;
+       do_div(val, 1000000ULL);
+       return val;
+}
+
+static void omap3_set_clksetup(u32 usec, struct voltagedomain *voltdm)
+{
+       voltdm->write(omap_usec_to_32k(usec), OMAP3_PRM_CLKSETUP_OFFSET);
+}
+
 static void omap3_set_i2c_timings(struct voltagedomain *voltdm, int off_mode)
 {
        unsigned long voltsetup1;
        u32 tgt_volt;
 
+       /* Oscillator is not shut down if omap is controlling voltages */
+       omap3_set_clksetup(1, voltdm);
+
        if (off_mode)
                tgt_volt = voltdm->vc_param->off;
        else
@@ -241,6 +260,7 @@ static void omap3_set_off_timings(struct voltagedomain 
*voltdm)
        unsigned long voltsetup2;
        unsigned long voltsetup2_old;
        u32 val;
+       u32 tstart, tshut;
 
        /* check if pmic is controlling off-mode voltages */
        val = voltdm->read(OMAP3_PRM_VOLTCTRL_OFFSET);
@@ -250,6 +270,9 @@ 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 */
@@ -336,10 +359,24 @@ static u32 omap4_calc_volt_ramp(struct voltagedomain 
*voltdm, u32 voltage_diff,
                (cycles << OMAP4430_RAMP_UP_COUNT_SHIFT);
 }
 
+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;
+}
+
 static void omap4_set_timings(struct voltagedomain *voltdm, bool off_mode)
 {
        u32 val;
        u32 ramp;
+       u32 tstart, tshut;
 
        /* configure the setup times */
        val = voltdm->read(voltdm->vfsm->voltsetup_reg);
@@ -361,6 +398,15 @@ static void omap4_set_timings(struct voltagedomain 
*voltdm, bool off_mode)
        val |= ramp << OMAP4430_RAMP_UP_COUNT_SHIFT;
 
        voltdm->write(val, voltdm->vfsm->voltsetup_reg);
+
+       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 */
-- 
1.7.4.1

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