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Diffstat (limited to 'drivers/clk/qcom/gdsc.c')
-rw-r--r--drivers/clk/qcom/gdsc.c102
1 files changed, 78 insertions, 24 deletions
diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index a4f3580587b7..a077133c7ce3 100644
--- a/drivers/clk/qcom/gdsc.c
+++ b/drivers/clk/qcom/gdsc.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015, 2017-2018, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -31,6 +31,12 @@
#define HW_CONTROL_MASK BIT(1)
#define SW_COLLAPSE_MASK BIT(0)
#define GMEM_CLAMP_IO_MASK BIT(0)
+#define GMEM_RESET_MASK BIT(4)
+
+/* CFG_GDSCR */
+#define GDSC_POWER_UP_COMPLETE BIT(16)
+#define GDSC_POWER_DOWN_COMPLETE BIT(15)
+#define CFG_GDSCR_OFFSET 0x4
/* Wait 2^n CXO cycles between all states. Here, n=2 (4 cycles). */
#define EN_REST_WAIT_VAL (0x2 << 20)
@@ -40,20 +46,50 @@
#define RETAIN_MEM BIT(14)
#define RETAIN_PERIPH BIT(13)
-#define TIMEOUT_US 100
+#define TIMEOUT_US 500
#define domain_to_gdsc(domain) container_of(domain, struct gdsc, pd)
-static int gdsc_is_enabled(struct gdsc *sc, unsigned int reg)
+enum gdsc_status {
+ GDSC_OFF,
+ GDSC_ON
+};
+
+/* Returns 1 if GDSC status is status, 0 if not, and < 0 on error */
+static int gdsc_check_status(struct gdsc *sc, enum gdsc_status status)
{
+ unsigned int reg;
u32 val;
int ret;
+ if (sc->flags & POLL_CFG_GDSCR)
+ reg = sc->gdscr + CFG_GDSCR_OFFSET;
+ else if (sc->gds_hw_ctrl)
+ reg = sc->gds_hw_ctrl;
+ else
+ reg = sc->gdscr;
+
ret = regmap_read(sc->regmap, reg, &val);
if (ret)
return ret;
- return !!(val & PWR_ON_MASK);
+ if (sc->flags & POLL_CFG_GDSCR) {
+ switch (status) {
+ case GDSC_ON:
+ return !!(val & GDSC_POWER_UP_COMPLETE);
+ case GDSC_OFF:
+ return !!(val & GDSC_POWER_DOWN_COMPLETE);
+ }
+ }
+
+ switch (status) {
+ case GDSC_ON:
+ return !!(val & PWR_ON_MASK);
+ case GDSC_OFF:
+ return !(val & PWR_ON_MASK);
+ }
+
+ return -EINVAL;
}
static int gdsc_hwctrl(struct gdsc *sc, bool en)
@@ -63,34 +99,33 @@ static int gdsc_hwctrl(struct gdsc *sc, bool en)
return regmap_update_bits(sc->regmap, sc->gdscr, HW_CONTROL_MASK, val);
}
-static int gdsc_poll_status(struct gdsc *sc, unsigned int reg, bool en)
+static int gdsc_poll_status(struct gdsc *sc, enum gdsc_status status)
{
ktime_t start;
start = ktime_get();
do {
- if (gdsc_is_enabled(sc, reg) == en)
+ if (gdsc_check_status(sc, status))
return 0;
} while (ktime_us_delta(ktime_get(), start) < TIMEOUT_US);
- if (gdsc_is_enabled(sc, reg) == en)
+ if (gdsc_check_status(sc, status))
return 0;
return -ETIMEDOUT;
}
-static int gdsc_toggle_logic(struct gdsc *sc, bool en)
+static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
{
int ret;
- u32 val = en ? 0 : SW_COLLAPSE_MASK;
- unsigned int status_reg = sc->gdscr;
+ u32 val = (status == GDSC_ON) ? 0 : SW_COLLAPSE_MASK;
ret = regmap_update_bits(sc->regmap, sc->gdscr, SW_COLLAPSE_MASK, val);
if (ret)
return ret;
/* If disabling votable gdscs, don't poll on status */
- if ((sc->flags & VOTABLE) && !en) {
+ if ((sc->flags & VOTABLE) && status == GDSC_OFF) {
/*
* Add a short delay here to ensure that an enable
* right after it was disabled does not put it in an
@@ -101,7 +136,6 @@ static int gdsc_toggle_logic(struct gdsc *sc, bool en)
}
if (sc->gds_hw_ctrl) {
- status_reg = sc->gds_hw_ctrl;
/*
* The gds hw controller asserts/de-asserts the status bit soon
* after it receives a power on/off request from a master.
@@ -115,7 +149,7 @@ static int gdsc_toggle_logic(struct gdsc *sc, bool en)
udelay(1);
}
- return gdsc_poll_status(sc, status_reg, en);
+ return gdsc_poll_status(sc, status);
}
static inline int gdsc_deassert_reset(struct gdsc *sc)
@@ -166,6 +200,14 @@ static inline void gdsc_assert_clamp_io(struct gdsc *sc)
GMEM_CLAMP_IO_MASK, 1);
}
+static inline void gdsc_assert_reset_aon(struct gdsc *sc)
+{
+ regmap_update_bits(sc->regmap, sc->clamp_io_ctrl,
+ GMEM_RESET_MASK, 1);
+ udelay(1);
+ regmap_update_bits(sc->regmap, sc->clamp_io_ctrl,
+ GMEM_RESET_MASK, 0);
+}
static int gdsc_enable(struct generic_pm_domain *domain)
{
struct gdsc *sc = domain_to_gdsc(domain);
@@ -174,10 +216,19 @@ static int gdsc_enable(struct generic_pm_domain *domain)
if (sc->pwrsts == PWRSTS_ON)
return gdsc_deassert_reset(sc);
- if (sc->flags & CLAMP_IO)
+ if (sc->flags & SW_RESET) {
+ gdsc_assert_reset(sc);
+ udelay(1);
+ gdsc_deassert_reset(sc);
+ }
+
+ if (sc->flags & CLAMP_IO) {
+ if (sc->flags & AON_RESET)
+ gdsc_assert_reset_aon(sc);
gdsc_deassert_clamp_io(sc);
+ }
- ret = gdsc_toggle_logic(sc, true);
+ ret = gdsc_toggle_logic(sc, GDSC_ON);
if (ret)
return ret;
@@ -222,8 +273,6 @@ static int gdsc_disable(struct generic_pm_domain *domain)
/* Turn off HW trigger mode if supported */
if (sc->flags & HW_CTRL) {
- unsigned int reg;
-
ret = gdsc_hwctrl(sc, false);
if (ret < 0)
return ret;
@@ -235,8 +284,7 @@ static int gdsc_disable(struct generic_pm_domain *domain)
*/
udelay(1);
- reg = sc->gds_hw_ctrl ? sc->gds_hw_ctrl : sc->gdscr;
- ret = gdsc_poll_status(sc, reg, true);
+ ret = gdsc_poll_status(sc, GDSC_ON);
if (ret)
return ret;
}
@@ -244,7 +292,7 @@ static int gdsc_disable(struct generic_pm_domain *domain)
if (sc->pwrsts & PWRSTS_OFF)
gdsc_clear_mem_on(sc);
- ret = gdsc_toggle_logic(sc, false);
+ ret = gdsc_toggle_logic(sc, GDSC_OFF);
if (ret)
return ret;
@@ -258,7 +306,6 @@ static int gdsc_init(struct gdsc *sc)
{
u32 mask, val;
int on, ret;
- unsigned int reg;
/*
* Disable HW trigger: collapse/restore occur based on registers writes.
@@ -274,13 +321,12 @@ static int gdsc_init(struct gdsc *sc)
/* Force gdsc ON if only ON state is supported */
if (sc->pwrsts == PWRSTS_ON) {
- ret = gdsc_toggle_logic(sc, true);
+ ret = gdsc_toggle_logic(sc, GDSC_ON);
if (ret)
return ret;
}
- reg = sc->gds_hw_ctrl ? sc->gds_hw_ctrl : sc->gdscr;
- on = gdsc_is_enabled(sc, reg);
+ on = gdsc_check_status(sc, GDSC_ON);
if (on < 0)
return on;
@@ -291,6 +337,14 @@ static int gdsc_init(struct gdsc *sc)
if ((sc->flags & VOTABLE) && on)
gdsc_enable(&sc->pd);
+ /* If ALWAYS_ON GDSCs are not ON, turn them ON */
+ if (sc->flags & ALWAYS_ON) {
+ if (!on)
+ gdsc_enable(&sc->pd);
+ on = true;
+ sc->pd.flags |= GENPD_FLAG_ALWAYS_ON;
+ }
+
if (on || (sc->pwrsts & PWRSTS_RET))
gdsc_force_mem_on(sc);
else
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 12:21:16 +0100