OMAP3: PM: INTC context save/restore

Add context save and restore for the INTC module to support off-mode.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

2 files changed, 71 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c
index 1db121f437d2..ebd3538bd1d4 100644
--- a/arch/arm/mach-omap2/irq.c
+++ b/arch/arm/mach-omap2/irq.c
@@ -25,6 +25,10 @@
 #define INTC_SYSSTATUS          0x0014
 #define INTC_SIR                0x0040
 #define INTC_CONTROL            0x0048
+#define INTC_PROTECTION         0x004C
+#define INTC_IDLE               0x0050
+#define INTC_THRESHOLD          0x0068
+#define INTC_MIR0               0x0084
 #define INTC_MIR_CLEAR0         0x0088
 #define INTC_MIR_SET0           0x008c
 #define INTC_PENDING_IRQ0       0x0098
@@ -48,6 +52,18 @@ static struct omap_irq_bank {
         },
 };
 
+/* Structure to save interrupt controller context */
+struct omap3_intc_regs {
+        u32 sysconfig;
+        u32 protection;
+        u32 idle;
+        u32 threshold;
+        u32 ilr[INTCPS_NR_IRQS];
+        u32 mir[INTCPS_NR_MIR_REGS];
+};
+
+static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];
+
 /* INTC bank register get/set */
 
 static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
@@ -209,3 +225,53 @@ void __init omap_init_irq(void)
         }
 }
 
+#ifdef CONFIG_ARCH_OMAP3
+void omap_intc_save_context(void)
+{
+        int ind = 0, i = 0;
+        for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
+                struct omap_irq_bank *bank = irq_banks + ind;
+                intc_context[ind].sysconfig =
+                        intc_bank_read_reg(bank, INTC_SYSCONFIG);
+                intc_context[ind].protection =
+                        intc_bank_read_reg(bank, INTC_PROTECTION);
+                intc_context[ind].idle =
+                        intc_bank_read_reg(bank, INTC_IDLE);
+                intc_context[ind].threshold =
+                        intc_bank_read_reg(bank, INTC_THRESHOLD);
+                for (i = 0; i < INTCPS_NR_IRQS; i++)
+                        intc_context[ind].ilr[i] =
+                                intc_bank_read_reg(bank, (0x100 + 0x4*ind));
+                for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
+                        intc_context[ind].mir[i] =
+                                intc_bank_read_reg(&irq_banks[0], INTC_MIR0 +
+                                (0x20 * i));
+        }
+}
+
+void omap_intc_restore_context(void)
+{
+        int ind = 0, i = 0;
+
+        for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
+                struct omap_irq_bank *bank = irq_banks + ind;
+                intc_bank_write_reg(intc_context[ind].sysconfig,
+                                        bank, INTC_SYSCONFIG);
+                intc_bank_write_reg(intc_context[ind].sysconfig,
+                                        bank, INTC_SYSCONFIG);
+                intc_bank_write_reg(intc_context[ind].protection,
+                                        bank, INTC_PROTECTION);
+                intc_bank_write_reg(intc_context[ind].idle,
+                                        bank, INTC_IDLE);
+                intc_bank_write_reg(intc_context[ind].threshold,
+                                        bank, INTC_THRESHOLD);
+                for (i = 0; i < INTCPS_NR_IRQS; i++)
+                        intc_bank_write_reg(intc_context[ind].ilr[i],
+                                bank, (0x100 + 0x4*ind));
+                for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
+                        intc_bank_write_reg(intc_context[ind].mir[i],
+                                 &irq_banks[0], INTC_MIR0 + (0x20 * i));
+        }
+        /* MIRs are saved and restore with other PRCM registers */
+}
+#endif /* CONFIG_ARCH_OMAP3 */
diff --git a/arch/arm/plat-omap/include/plat/irqs.h b/arch/arm/plat-omap/include/plat/irqs.h
index 6a6d0281e1d5..ce5dd2d1dc21 100644
--- a/arch/arm/plat-omap/include/plat/irqs.h
+++ b/arch/arm/plat-omap/include/plat/irqs.h
@@ -477,9 +477,14 @@
 
 #define OMAP_IRQ_BIT(irq)       (1 << ((irq) % 32))
 
+#define INTCPS_NR_MIR_REGS      3
+#define INTCPS_NR_IRQS          96
+
 #ifndef __ASSEMBLY__
 extern void omap_init_irq(void);
 extern int omap_irq_pending(void);
+void omap_intc_save_context(void);
+void omap_intc_restore_context(void);
 #endif
 
 #include <mach/hardware.h>