This patch adds the context save restore functions for GPMC
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
---
arch/arm/mach-omap2/gpmc.c | 93 +++++++++++++++++++++++++++++++++
arch/arm/plat-omap/include/mach/gpmc.h | 3 +
2 files changed, 96 insertions(+)
Index: linux-omap-2.6/arch/arm/mach-omap2/gpmc.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/gpmc.c 2008-09-25 16:26:40.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/gpmc.c 2008-09-25 16:27:13.000000000 +0530
@@ -54,10 +54,38 @@
#define GPMC_CHUNK_SHIFT 24 /* 16 MB */
#define GPMC_SECTION_SHIFT 28 /* 128 MB */
+/* 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);
static unsigned gpmc_cs_map;
+static struct omap3_gpmc_regs gpmc_context;
static void __iomem *gpmc_base;
@@ -451,3 +479,68 @@ void __init gpmc_init(void)
gpmc_mem_init();
}
+
+#ifdef CONFIG_ARCH_OMAP3
+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_read_reg(i, GPMC_CS_CONFIG7))
+ & GPMC_CONFIG7_CSVALID;
+ 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 */
Index: linux-omap-2.6/arch/arm/plat-omap/include/mach/gpmc.h
===================================================================
--- linux-omap-2.6.orig/arch/arm/plat-omap/include/mach/gpmc.h 2008-09-25 16:26:40.000000000 +0530
+++ linux-omap-2.6/arch/arm/plat-omap/include/mach/gpmc.h 2008-09-25 16:27:13.000000000 +0530
@@ -52,6 +52,7 @@
#define GPMC_CONFIG1_FCLK_DIV2 (GPMC_CONFIG1_FCLK_DIV(1))
#define GPMC_CONFIG1_FCLK_DIV3 (GPMC_CONFIG1_FCLK_DIV(2))
#define GPMC_CONFIG1_FCLK_DIV4 (GPMC_CONFIG1_FCLK_DIV(3))
+#define GPMC_CONFIG7_CSVALID (1 << 6)
/*
* Note that all values in this struct are in nanoseconds, while
@@ -103,6 +104,8 @@ extern int gpmc_cs_request(int cs, unsig
extern void gpmc_cs_free(int cs);
extern int gpmc_cs_set_reserved(int cs, int reserved);
extern int gpmc_cs_reserved(int cs);
+extern void omap3_gpmc_save_context(void);
+extern void omap3_gpmc_restore_context(void);
extern void __init gpmc_init(void);
#endif
--
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