OMAP3: PM: GPMC context save/restore

This patch adds the context save and restore functions for GPMC to
enable off-mode.

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

1 files changed, 95 insertions, 3 deletions

diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 004da696ace7..7d687845f391 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -62,6 +62,33 @@
 #define ENABLE_PREFETCH         (0x1 << 7)
 #define DMA_MPU_MODE            2
 
+/* Structure to save gpmc cs context */
+struct gpmc_cs_config {
+        u32 config1;
+        u32 config2;
+        u32 config3;
+        u32 config4;
+        u32 config5;
+        u32 config6;
+        u32 config7;
+        int is_valid;
+};
+
+/*
+ * Structure to save/restore gpmc context
+ * to support core off on OMAP3
+ */
+struct omap3_gpmc_regs {
+        u32 sysconfig;
+        u32 irqenable;
+        u32 timeout_ctrl;
+        u32 config;
+        u32 prefetch_config1;
+        u32 prefetch_config2;
+        u32 prefetch_control;
+        struct gpmc_cs_config cs_context[GPMC_CS_NUM];
+};
+
 static struct resource  gpmc_mem_root;
 static struct resource  gpmc_cs_mem[GPMC_CS_NUM];
 static DEFINE_SPINLOCK(gpmc_mem_lock);
@@ -261,7 +288,7 @@ static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
         l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
         l &= ~(0x0f << 8);
         l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
-        l |= 1 << 6;            /* CSVALID */
+        l |= GPMC_CONFIG7_CSVALID;
         gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
 }
 
@@ -270,7 +297,7 @@ static void gpmc_cs_disable_mem(int cs)
         u32 l;
 
         l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
-        l &= ~(1 << 6);         /* CSVALID */
+        l &= ~GPMC_CONFIG7_CSVALID;
         gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
 }
 
@@ -290,7 +317,7 @@ static int gpmc_cs_mem_enabled(int cs)
         u32 l;
 
         l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
-        return l & (1 << 6);
+        return l & GPMC_CONFIG7_CSVALID;
 }
 
 int gpmc_cs_set_reserved(int cs, int reserved)
@@ -516,3 +543,68 @@ void __init gpmc_init(void)
         gpmc_write_reg(GPMC_SYSCONFIG, l);
         gpmc_mem_init();
 }
+
+#ifdef CONFIG_ARCH_OMAP3
+static struct omap3_gpmc_regs gpmc_context;
+
+void omap3_gpmc_save_context()
+{
+        int i;
+        gpmc_context.sysconfig = gpmc_read_reg(GPMC_SYSCONFIG);
+        gpmc_context.irqenable = gpmc_read_reg(GPMC_IRQENABLE);
+        gpmc_context.timeout_ctrl = gpmc_read_reg(GPMC_TIMEOUT_CONTROL);
+        gpmc_context.config = gpmc_read_reg(GPMC_CONFIG);
+        gpmc_context.prefetch_config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
+        gpmc_context.prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2);
+        gpmc_context.prefetch_control = gpmc_read_reg(GPMC_PREFETCH_CONTROL);
+        for (i = 0; i < GPMC_CS_NUM; i++) {
+                gpmc_context.cs_context[i].is_valid = gpmc_cs_mem_enabled(i);
+                if (gpmc_context.cs_context[i].is_valid) {
+                        gpmc_context.cs_context[i].config1 =
+                                gpmc_cs_read_reg(i, GPMC_CS_CONFIG1);
+                        gpmc_context.cs_context[i].config2 =
+                                gpmc_cs_read_reg(i, GPMC_CS_CONFIG2);
+                        gpmc_context.cs_context[i].config3 =
+                                gpmc_cs_read_reg(i, GPMC_CS_CONFIG3);
+                        gpmc_context.cs_context[i].config4 =
+                                gpmc_cs_read_reg(i, GPMC_CS_CONFIG4);
+                        gpmc_context.cs_context[i].config5 =
+                                gpmc_cs_read_reg(i, GPMC_CS_CONFIG5);
+                        gpmc_context.cs_context[i].config6 =
+                                gpmc_cs_read_reg(i, GPMC_CS_CONFIG6);
+                        gpmc_context.cs_context[i].config7 =
+                                gpmc_cs_read_reg(i, GPMC_CS_CONFIG7);
+                }
+        }
+}
+
+void omap3_gpmc_restore_context()
+{
+        int i;
+        gpmc_write_reg(GPMC_SYSCONFIG, gpmc_context.sysconfig);
+        gpmc_write_reg(GPMC_IRQENABLE, gpmc_context.irqenable);
+        gpmc_write_reg(GPMC_TIMEOUT_CONTROL, gpmc_context.timeout_ctrl);
+        gpmc_write_reg(GPMC_CONFIG, gpmc_context.config);
+        gpmc_write_reg(GPMC_PREFETCH_CONFIG1, gpmc_context.prefetch_config1);
+        gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context.prefetch_config2);
+        gpmc_write_reg(GPMC_PREFETCH_CONTROL, gpmc_context.prefetch_control);
+        for (i = 0; i < GPMC_CS_NUM; i++) {
+                if (gpmc_context.cs_context[i].is_valid) {
+                        gpmc_cs_write_reg(i, GPMC_CS_CONFIG1,
+                                gpmc_context.cs_context[i].config1);
+                        gpmc_cs_write_reg(i, GPMC_CS_CONFIG2,
+                                gpmc_context.cs_context[i].config2);
+                        gpmc_cs_write_reg(i, GPMC_CS_CONFIG3,
+                                gpmc_context.cs_context[i].config3);
+                        gpmc_cs_write_reg(i, GPMC_CS_CONFIG4,
+                                gpmc_context.cs_context[i].config4);
+                        gpmc_cs_write_reg(i, GPMC_CS_CONFIG5,
+                                gpmc_context.cs_context[i].config5);
+                        gpmc_cs_write_reg(i, GPMC_CS_CONFIG6,
+                                gpmc_context.cs_context[i].config6);
+                        gpmc_cs_write_reg(i, GPMC_CS_CONFIG7,
+                                gpmc_context.cs_context[i].config7);
+                }
+        }
+}
+#endif /* CONFIG_ARCH_OMAP3 */