Voltage code will now enable / disable auto_ret / auto_off dynamically
according to the voltagedomain usecounts. This is accomplished via
the usage of the voltdm callback functions for sleep / wakeup.
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
arch/arm/mach-omap2/vc.c | 139 +++++++++++++++++++++++++++++++++++++++------
1 files changed, 120 insertions(+), 19 deletions(-)
diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c
index a587506..2ca00bc 100644
--- a/arch/arm/mach-omap2/vc.c
+++ b/arch/arm/mach-omap2/vc.c
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/bug.h>
#include <linux/io.h>
+#include <linux/string.h>
#include <asm/div64.h>
@@ -240,12 +241,6 @@ 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
@@ -259,12 +254,6 @@ static void omap3_set_i2c_timings(struct voltagedomain *voltdm, bool off_mode)
voltdm->rmw(voltdm->vfsm->voltsetup_mask,
voltsetup1 << __ffs(voltdm->vfsm->voltsetup_mask),
voltdm->vfsm->voltsetup_reg);
-
- /*
- * pmic is not controlling the voltage scaling during retention,
- * thus set voltsetup2 to 0
- */
- voltdm->write(0, OMAP3_PRM_VOLTSETUP2_OFFSET);
}
/**
@@ -286,7 +275,6 @@ 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);
@@ -296,9 +284,6 @@ 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 */
@@ -328,17 +313,133 @@ static void omap3_set_off_timings(struct voltagedomain *voltdm)
*/
voltdm->rmw(voltdm->vfsm->voltsetup_mask, 0,
voltdm->vfsm->voltsetup_reg);
+}
+
+/**
+ * omap3_set_core_ret_timings - set retention timings for core domain
+ * @voltdm: pointer for core voltagedomain struct
+ *
+ * This function is called once core domain is ready to enter
+ * retention. This sets the values for the global setup variables like
+ * oscillator setup time, and the ramp times for voltages.
+ */
+static void omap3_set_core_ret_timings(struct voltagedomain *voltdm)
+{
+ /*
+ * Oscillator is not shut down in retention, thus set minimal
+ * clock setup time
+ */
+ omap3_set_clksetup(1, voltdm);
- /* voltoffset must be clksetup minus voltsetup2 according to TRM */
- voltdm->write(clksetup - voltsetup2, OMAP3_PRM_VOLTOFFSET_OFFSET);
+ /*
+ * Reset voltsetup 2 and voltoffset when entering retention
+ * as they are only used when pmic is controlling voltages
+ */
+ voltdm->write(0, OMAP3_PRM_VOLTSETUP2_OFFSET);
+ voltdm->write(0, OMAP3_PRM_VOLTOFFSET_OFFSET);
+ omap3_set_i2c_timings(voltdm, false);
}
-static void __init omap3_vc_init_channel(struct voltagedomain *voltdm)
+/**
+ * omap3_set_core_off_timings - set off timings for core domain
+ * @voltdm: pointer for core voltagedomain struct
+ *
+ * This function is called once core domain is ready to enter off-mode.
+ * This sets the values for the global setup variables like oscillator
+ * setup time, and the ramp times for voltages.
+ */
+static void omap3_set_core_off_timings(struct voltagedomain *voltdm)
{
+ u32 tstart, tshut;
+
+ omap_pm_get_oscillator(&tstart, &tshut);
+ omap3_set_clksetup(tstart, voltdm);
omap3_set_off_timings(voltdm);
}
/**
+ * omap3_vc_channel_sleep - idle callback for a voltagedomain
+ * @voltdm: voltage channel that is entering idle
+ *
+ * Prepares voltage channel for entering idle. This gets called from
+ * the voltagedomain code once the usecount for the domain reaches zero.
+ * Function checks the target sleep mode and configures the channel
+ * accordingly.
+ */
+static void omap3_vc_channel_sleep(struct voltagedomain *voltdm)
+{
+ /* Set off timings if entering off */
+ if (voltdm->target_state == PWRDM_POWER_OFF)
+ omap3_set_off_timings(voltdm);
+ else
+ omap3_set_i2c_timings(voltdm, false);
+}
+
+/**
+ * omap3_vc_core_sleep - idle callback for core voltagedomain
+ * @voltdm: pointer to core voltagedomain struct
+ *
+ * Prepares core voltagedomain for idle. This checks the target sleep
+ * mode of the device (highest sleep mode of all powerdomains), and
+ * sets up the device according to this either for retention, sleep
+ * or off-mode.
+ */
+static void omap3_vc_core_sleep(struct voltagedomain *voltdm)
+{
+ u8 mode;
+
+ switch (voltdm->target_state) {
+ case PWRDM_POWER_OFF:
+ mode = OMAP3430_AUTO_OFF_MASK;
+ break;
+ case PWRDM_POWER_RET:
+ mode = OMAP3430_AUTO_RET_MASK;
+ break;
+ default:
+ mode = OMAP3430_AUTO_SLEEP_MASK;
+ break;
+ }
+
+ if (mode == OMAP3430_AUTO_OFF_MASK)
+ omap3_set_core_off_timings(voltdm);
+ else
+ omap3_set_core_ret_timings(voltdm);
+
+ voltdm->rmw(OMAP3430_AUTO_OFF_MASK | OMAP3430_AUTO_RET_MASK |
+ OMAP3430_AUTO_SLEEP_MASK, mode,
+ OMAP3_PRM_VOLTCTRL_OFFSET);
+}
+
+/**
+ * omap3_vc_core_wakeup - wakeup callback for core domain
+ * @voltdm: pointer to core voltagedomain struct
+ *
+ * Resumes core voltagedomain from idle. Callback from voltagedomain
+ * code once usecount reaches non-zero value.
+ */
+static void omap3_vc_core_wakeup(struct voltagedomain *voltdm)
+{
+ voltdm->rmw(OMAP3430_AUTO_OFF_MASK | OMAP3430_AUTO_RET_MASK |
+ OMAP3430_AUTO_SLEEP_MASK, 0, OMAP3_PRM_VOLTCTRL_OFFSET);
+}
+
+static void __init omap3_vc_init_channel(struct voltagedomain *voltdm)
+{
+ /*
+ * Set up voltagedomain callbacks for idle / resume and init
+ * channel for retention voltage levels.
+ */
+ if (!strcmp(voltdm->name, "core")) {
+ voltdm->sleep = omap3_vc_core_sleep;
+ voltdm->wakeup = omap3_vc_core_wakeup;
+ omap3_set_core_ret_timings(voltdm);
+ } else {
+ voltdm->sleep = omap3_vc_channel_sleep;
+ omap3_set_i2c_timings(voltdm, false);
+ }
+}
+
+/**
* omap4_calc_volt_ramp - calculates voltage ramping delays on omap4
* @voltdm: channel to calculate values for
* @voltage_diff: voltage difference in microvolts
--
1.7.4.1
--
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