WakeupGen IP is integrated along with GIC to manage the
interrupt wakeups from CPU low power states. It's located in
always ON power domain. It manages masking/unmasking of
Shared peripheral interrupts(SPI).So the interrupt enable/disable
control should be in sync and consistent at WakeupGen and GIC so
that interrupts are not lost.
Considering this GIC and WakeupGen save and restore is done
together.
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Cc: Kevin Hilman <khilman@xxxxxx>
---
arch/arm/mach-omap2/include/mach/omap-wakeupgen.h | 1 +
arch/arm/mach-omap2/omap-wakeupgen.c | 81 +++++++++++++++++++++
arch/arm/mach-omap2/omap4-mpuss-lowpower.c | 2 +
arch/arm/mach-omap2/omap4-sar-layout.h | 11 +++
4 files changed, 95 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/include/mach/omap-wakeupgen.h b/arch/arm/mach-omap2/include/mach/omap-wakeupgen.h
index f10d106..66f31c3 100644
--- a/arch/arm/mach-omap2/include/mach/omap-wakeupgen.h
+++ b/arch/arm/mach-omap2/include/mach/omap-wakeupgen.h
@@ -37,4 +37,5 @@
extern int __init omap_wakeupgen_init(void);
extern void omap_wakeupgen_irqmask_all(unsigned int cpu, unsigned int set);
+extern void omap_wakeupgen_save(void);
#endif
diff --git a/arch/arm/mach-omap2/omap-wakeupgen.c b/arch/arm/mach-omap2/omap-wakeupgen.c
index d9d2a3e..345a55c 100644
--- a/arch/arm/mach-omap2/omap-wakeupgen.c
+++ b/arch/arm/mach-omap2/omap-wakeupgen.c
@@ -24,6 +24,9 @@
#include <asm/hardware/gic.h>
#include <mach/omap-wakeupgen.h>
+#include <mach/omap4-common.h>
+
+#include "omap4-sar-layout.h"
#define NR_BANKS 4
#define MAX_IRQS 128
@@ -35,6 +38,7 @@
/* WakeupGen Base addres */
static void __iomem *wakeupgen_base;
+static void __iomem *sar_base;
static DEFINE_PER_CPU(u32 [NR_BANKS], irqmasks);
static DEFINE_SPINLOCK(wakeupgen_lock);
@@ -54,6 +58,11 @@ static inline void wakeupgen_writel(u32 val, u8 idx, u32 cpu)
(cpu * CPU_ENA_OFFSET) + (idx * 4));
}
+static inline void sar_writel(u32 val, u32 offset, u8 idx)
+{
+ __raw_writel(val, sar_base + offset + (idx * 4));
+}
+
static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
{
u8 i;
@@ -236,3 +245,75 @@ int __init omap_wakeupgen_init(void)
return 0;
}
+
+/**
+ * omap_wakeupgen_save() - WakeupGen context save function
+ *
+ * Save WakewupGen context in SAR BANK3. Restore is done by ROM code.
+ * WakeupGen IP is integrated along with GIC to manage the
+ * interrupt wakeups from CPU low power states. It's located in
+ * always ON power domain. It manages masking/unmasking of
+ * Shared peripheral interrupts(SPI).So the interrupt enable/disable
+ * control should be in sync and consistent at WakeupGen and GIC so
+ * that interrupts are not lost. Hence GIC and WakeupGen are saved
+ * and restored together.
+
+ * During normal operation, WakeupGen delivers external interrupts
+ * directly to the GIC. When the CPU asserts StandbyWFI, indicating
+ * it wants to enter lowpower state, the Standby Controller checks
+ * with the WakeupGen unit using the idlereq/idleack handshake to make
+ * sure there is no incoming interrupts.
+ */
+
+void omap_wakeupgen_save(void)
+{
+ u8 i;
+ u32 val;
+
+ if (omap_rev() == OMAP4430_REV_ES1_0)
+ return;
+
+ if (!sar_base)
+ sar_base = omap4_get_sar_ram_base();
+
+ for (i = 0; i < NR_BANKS; i++) {
+ /* Save the CPUx interrupt mask for IRQ 0 to 127 */
+ val = wakeupgen_readl(i, 0);
+ sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
+ val = wakeupgen_readl(i, 1);
+ sar_writel(val, WAKEUPGENENB_OFFSET_CPU1, i);
+
+ /*
+ * Disable the secure interrupts for CPUx. The restore
+ * code blindly restores secure and non-secure interrupt
+ * masks from SAR RAM. Secure interrupts are not suppose
+ * to be enabled from HLOS. So overwrite the SAR location
+ * so that the secure interrupt remains disabled.
+ */
+ sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
+ sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
+ }
+
+ /* Save AuxBoot* registers */
+ val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+ __raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
+ val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+ __raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);
+
+ /* Save SyncReq generation logic */
+ val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+ __raw_writel(val, sar_base + AUXCOREBOOT0_OFFSET);
+ val = __raw_readl(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+ __raw_writel(val, sar_base + AUXCOREBOOT1_OFFSET);
+
+ /* Save SyncReq generation logic */
+ val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_MASK);
+ __raw_writel(val, sar_base + PTMSYNCREQ_MASK_OFFSET);
+ val = __raw_readl(wakeupgen_base + OMAP_PTMSYNCREQ_EN);
+ __raw_writel(val, sar_base + PTMSYNCREQ_EN_OFFSET);
+
+ /* Set the Backup Bit Mask status */
+ val = __raw_readl(sar_base + SAR_BACKUP_STATUS_OFFSET);
+ val |= SAR_BACKUP_STATUS_WAKEUPGEN;
+ __raw_writel(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
+}
diff --git a/arch/arm/mach-omap2/omap4-mpuss-lowpower.c b/arch/arm/mach-omap2/omap4-mpuss-lowpower.c
index 446b956..ddf5b72 100644
--- a/arch/arm/mach-omap2/omap4-mpuss-lowpower.c
+++ b/arch/arm/mach-omap2/omap4-mpuss-lowpower.c
@@ -52,6 +52,7 @@
#include <plat/omap44xx.h>
#include <mach/omap4-common.h>
+#include <mach/omap-wakeupgen.h>
#include "omap4-sar-layout.h"
#include "pm.h"
@@ -292,6 +293,7 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state)
* GIC lost during MPU OFF and OSWR
*/
if (pwrdm_read_next_pwrst(mpuss_pd) == PWRDM_POWER_OFF) {
+ omap_wakeupgen_save();
gic_save_context();
save_state = 3;
}
diff --git a/arch/arm/mach-omap2/omap4-sar-layout.h b/arch/arm/mach-omap2/omap4-sar-layout.h
index baac4c0..3f3e3c9 100644
--- a/arch/arm/mach-omap2/omap4-sar-layout.h
+++ b/arch/arm/mach-omap2/omap4-sar-layout.h
@@ -50,4 +50,15 @@
#define SAR_BACKUP_STATUS_GIC_CPU0 0x1
#define SAR_BACKUP_STATUS_GIC_CPU1 0x2
+/* WakeUpGen save restore offset from OMAP44XX_SAR_RAM_BASE */
+#define WAKEUPGENENB_OFFSET_CPU0 (SAR_BANK3_OFFSET + 0x684)
+#define WAKEUPGENENB_SECURE_OFFSET_CPU0 (SAR_BANK3_OFFSET + 0x694)
+#define WAKEUPGENENB_OFFSET_CPU1 (SAR_BANK3_OFFSET + 0x6a4)
+#define WAKEUPGENENB_SECURE_OFFSET_CPU1 (SAR_BANK3_OFFSET + 0x6b4)
+#define AUXCOREBOOT0_OFFSET (SAR_BANK3_OFFSET + 0x6c4)
+#define AUXCOREBOOT1_OFFSET (SAR_BANK3_OFFSET + 0x6c8)
+#define PTMSYNCREQ_MASK_OFFSET (SAR_BANK3_OFFSET + 0x6cc)
+#define PTMSYNCREQ_EN_OFFSET (SAR_BANK3_OFFSET + 0x6d0)
+#define SAR_BACKUP_STATUS_WAKEUPGEN 0x10
+
#endif
--
1.6.0.4
--
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