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* [PATCH][V3] ux500 : decouple/recouple gic from the PRCMU
@ 2012-02-10 10:22 Daniel Lezcano
  2012-02-10 10:38 ` Daniel Lezcano
  0 siblings, 1 reply; 6+ messages in thread
From: Daniel Lezcano @ 2012-02-10 10:22 UTC (permalink / raw)
  To: linux-arm-kernel

This patch allows to decouple and recouple the gic from the PRCMU.
This is needed to put the A9 core in retention mode with the cpuidle
driver.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/mfd/db8500-prcmu.c       |   32 ++++++++++++++++++++++++++++++++
 include/linux/mfd/db8500-prcmu.h |    2 ++
 include/linux/mfd/dbx500-prcmu.h |   16 ++++++++++++++++
 3 files changed, 50 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index af8e0ef..9baf4cd 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -787,6 +787,38 @@ int db8500_prcmu_set_power_state(u8 state, bool keep_ulp_clk, bool keep_ap_pll)
 	return 0;
 }
 
+#define PRCMU_A9_MASK_REQ               0x00000328
+#define PRCMU_A9_MASK_REQ_MASK          0x00000001
+#define PRCMU_GIC_DELAY                 1
+
+/* This function decouple the gic from the prcmu */
+int db8500_prcmu_gic_decouple(void)
+{
+	u32 val = readl(_PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	/* Set bit 0 register value to 1 */
+	writel(val | PRCMU_A9_MASK_REQ_MASK, _PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	/* Make sure the register is updated */
+	readl(_PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	/* Wait a few cycles for the gic mask completion */
+	udelay(PRCMU_GIC_DELAY);
+
+	return 0;
+}
+
+/* This function recouple the gic with the prcmu */
+int db8500_prcmu_gic_recouple(void)
+{
+	u32 val = readl(_PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	/* Set bit 0 register value to 0 */
+	writel(val & ~PRCMU_A9_MASK_REQ_MASK, _PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	return 0;
+}
+
 /* This function should only be called while mb0_transfer.lock is held. */
 static void config_wakeups(void)
 {
diff --git a/include/linux/mfd/db8500-prcmu.h b/include/linux/mfd/db8500-prcmu.h
index 60d27f7..a3c7eba 100644
--- a/include/linux/mfd/db8500-prcmu.h
+++ b/include/linux/mfd/db8500-prcmu.h
@@ -536,6 +536,8 @@ int prcmu_load_a9wdog(u8 id, u32 val);
 
 void db8500_prcmu_system_reset(u16 reset_code);
 int db8500_prcmu_set_power_state(u8 state, bool keep_ulp_clk, bool keep_ap_pll);
+int db8500_prcmu_gic_decouple(void);
+int db8500_prcmu_gic_recouple(void);
 void db8500_prcmu_enable_wakeups(u32 wakeups);
 int db8500_prcmu_set_epod(u16 epod_id, u8 epod_state);
 int db8500_prcmu_request_clock(u8 clock, bool enable);
diff --git a/include/linux/mfd/dbx500-prcmu.h b/include/linux/mfd/dbx500-prcmu.h
index bac942f..d38cf7d 100644
--- a/include/linux/mfd/dbx500-prcmu.h
+++ b/include/linux/mfd/dbx500-prcmu.h
@@ -237,6 +237,22 @@ static inline int prcmu_set_power_state(u8 state, bool keep_ulp_clk,
 			keep_ap_pll);
 }
 
+static inline int prcmu_gic_decouple(void)
+{
+	if (machine_is_u5500())
+		return -EINVAL;
+	else
+		return db8500_prcmu_gic_decouple();
+}
+
+static inline int prcmu_gic_recouple(void)
+{
+	if (machine_is_u5500())
+		return -EINVAL;
+	else
+		return db8500_prcmu_gic_recouple();
+}
+
 static inline int prcmu_set_epod(u16 epod_id, u8 epod_state)
 {
 	if (machine_is_u5500())
-- 
1.7.5.4

^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH][V3] ux500 : decouple/recouple gic from the PRCMU
@ 2012-02-20 11:30 Daniel Lezcano
       [not found] ` <4F4785D2.8070200@linaro.org>
  2012-02-27 13:55 ` Samuel Ortiz
  0 siblings, 2 replies; 6+ messages in thread
From: Daniel Lezcano @ 2012-02-20 11:30 UTC (permalink / raw)
  To: sameo; +Cc: linus.walleij, linux-kernel

This patch allows to decouple and recouple the gic from the PRCMU.
This is needed to put the A9 core in retention mode with the cpuidle
driver.

It is based on top of the "DB8500 PRCMU update" patchset.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/mfd/db8500-prcmu.c       |   32 ++++++++++++++++++++++++++++++++
 include/linux/mfd/db8500-prcmu.h |    2 ++
 include/linux/mfd/dbx500-prcmu.h |   16 ++++++++++++++++
 3 files changed, 50 insertions(+)

Index: mfd-2.6/drivers/mfd/db8500-prcmu.c
===================================================================
--- mfd-2.6.orig/drivers/mfd/db8500-prcmu.c
+++ mfd-2.6/drivers/mfd/db8500-prcmu.c
@@ -821,6 +821,38 @@ u8 db8500_prcmu_get_power_state_result(v
 	return readb(tcdm_base + PRCM_ACK_MB0_AP_PWRSTTR_STATUS);
 }
 
+#define PRCMU_A9_MASK_REQ               0x00000328
+#define PRCMU_A9_MASK_REQ_MASK          0x00000001
+#define PRCMU_GIC_DELAY                 1
+
+/* This function decouple the gic from the prcmu */
+int db8500_prcmu_gic_decouple(void)
+{
+	u32 val = readl(_PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	/* Set bit 0 register value to 1 */
+	writel(val | PRCMU_A9_MASK_REQ_MASK, _PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	/* Make sure the register is updated */
+	readl(_PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	/* Wait a few cycles for the gic mask completion */
+	udelay(PRCMU_GIC_DELAY);
+
+	return 0;
+}
+
+/* This function recouple the gic with the prcmu */
+int db8500_prcmu_gic_recouple(void)
+{
+	u32 val = readl(_PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	/* Set bit 0 register value to 0 */
+	writel(val & ~PRCMU_A9_MASK_REQ_MASK, _PRCMU_BASE + PRCMU_A9_MASK_REQ);
+
+	return 0;
+}
+
 /* This function should only be called while mb0_transfer.lock is held. */
 static void config_wakeups(void)
 {
Index: mfd-2.6/include/linux/mfd/db8500-prcmu.h
===================================================================
--- mfd-2.6.orig/include/linux/mfd/db8500-prcmu.h
+++ mfd-2.6/include/linux/mfd/db8500-prcmu.h
@@ -580,6 +580,8 @@ int db8500_prcmu_load_a9wdog(u8 id, u32
 void db8500_prcmu_system_reset(u16 reset_code);
 int db8500_prcmu_set_power_state(u8 state, bool keep_ulp_clk, bool keep_ap_pll);
 u8 db8500_prcmu_get_power_state_result(void);
+int db8500_prcmu_gic_decouple(void);
+int db8500_prcmu_gic_recouple(void);
 void db8500_prcmu_enable_wakeups(u32 wakeups);
 int db8500_prcmu_set_epod(u16 epod_id, u8 epod_state);
 int db8500_prcmu_request_clock(u8 clock, bool enable);
Index: mfd-2.6/include/linux/mfd/dbx500-prcmu.h
===================================================================
--- mfd-2.6.orig/include/linux/mfd/dbx500-prcmu.h
+++ mfd-2.6/include/linux/mfd/dbx500-prcmu.h
@@ -281,6 +281,22 @@ static inline u8 prcmu_get_power_state_r
 		return db8500_prcmu_get_power_state_result();
 }
 
+static inline int prcmu_gic_decouple(void)
+{
+	if (cpu_is_u5500())
+		return -EINVAL;
+	else
+		return db8500_prcmu_gic_decouple();
+}
+
+static inline int prcmu_gic_recouple(void)
+{
+	if (cpu_is_u5500())
+		return -EINVAL;
+	else
+		return db8500_prcmu_gic_recouple();
+}
+
 static inline int prcmu_set_epod(u16 epod_id, u8 epod_state)
 {
 	if (cpu_is_u5500())

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-02-27 13:48 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-02-10 10:22 [PATCH][V3] ux500 : decouple/recouple gic from the PRCMU Daniel Lezcano
2012-02-10 10:38 ` Daniel Lezcano
2012-02-13 19:43   ` Linus Walleij
  -- strict thread matches above, loose matches on Subject: below --
2012-02-20 11:30 Daniel Lezcano
     [not found] ` <4F4785D2.8070200@linaro.org>
     [not found]   ` <4F478D4B.6070602@stericsson.com>
2012-02-24 13:23     ` Daniel Lezcano
2012-02-27 13:55 ` Samuel Ortiz

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