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 | 62 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c
index 26750fe..a587506 100644
--- a/arch/arm/mach-omap2/vc.c
+++ b/arch/arm/mach-omap2/vc.c
@@ -11,14 +11,20 @@
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/bug.h>
+#include <linux/io.h>
+
+#include <asm/div64.h>
#include <plat/cpu.h>
+#include "iomap.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
@@ -206,6 +212,18 @@ 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
@@ -222,6 +240,12 @@ 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
@@ -262,6 +286,7 @@ 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);
@@ -271,6 +296,9 @@ 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 */
@@ -367,6 +395,30 @@ 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
@@ -378,6 +430,7 @@ 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,
@@ -399,6 +452,15 @@ 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 */
--
1.7.4.1
--
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