OMAP3: PM: Populate scratchpad contents

This patch populates the scratchpad contents as expected by the
bootROM code.

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

2 files changed, 213 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/control.c b/arch/arm/mach-omap2/control.c
index 6adb360c6d45..03e1bce3b3bb 100644
--- a/arch/arm/mach-omap2/control.c
+++ b/arch/arm/mach-omap2/control.c
@@ -17,9 +17,81 @@
 
 #include <plat/common.h>
 #include <plat/control.h>
+#include <plat/sdrc.h>
+#include "cm-regbits-34xx.h"
+#include "prm-regbits-34xx.h"
+#include "cm.h"
+#include "prm.h"
+#include "sdrc.h"
 
 static void __iomem *omap2_ctrl_base;
 
+struct omap3_scratchpad {
+        u32 boot_config_ptr;
+        u32 public_restore_ptr;
+        u32 secure_ram_restore_ptr;
+        u32 sdrc_module_semaphore;
+        u32 prcm_block_offset;
+        u32 sdrc_block_offset;
+};
+
+struct omap3_scratchpad_prcm_block {
+        u32 prm_clksrc_ctrl;
+        u32 prm_clksel;
+        u32 cm_clksel_core;
+        u32 cm_clksel_wkup;
+        u32 cm_clken_pll;
+        u32 cm_autoidle_pll;
+        u32 cm_clksel1_pll;
+        u32 cm_clksel2_pll;
+        u32 cm_clksel3_pll;
+        u32 cm_clken_pll_mpu;
+        u32 cm_autoidle_pll_mpu;
+        u32 cm_clksel1_pll_mpu;
+        u32 cm_clksel2_pll_mpu;
+        u32 prcm_block_size;
+};
+
+struct omap3_scratchpad_sdrc_block {
+        u16 sysconfig;
+        u16 cs_cfg;
+        u16 sharing;
+        u16 err_type;
+        u32 dll_a_ctrl;
+        u32 dll_b_ctrl;
+        u32 power;
+        u32 cs_0;
+        u32 mcfg_0;
+        u16 mr_0;
+        u16 emr_1_0;
+        u16 emr_2_0;
+        u16 emr_3_0;
+        u32 actim_ctrla_0;
+        u32 actim_ctrlb_0;
+        u32 rfr_ctrl_0;
+        u32 cs_1;
+        u32 mcfg_1;
+        u16 mr_1;
+        u16 emr_1_1;
+        u16 emr_2_1;
+        u16 emr_3_1;
+        u32 actim_ctrla_1;
+        u32 actim_ctrlb_1;
+        u32 rfr_ctrl_1;
+        u16 dcdl_1_ctrl;
+        u16 dcdl_2_ctrl;
+        u32 flags;
+        u32 block_size;
+};
+
+/*
+ * This is used to store ARM registers in SDRAM before attempting
+ * an MPU OFF. The save and restore happens from the SRAM sleep code.
+ * The address is stored in scratchpad, so that it can be used
+ * during the restore path.
+ */
+u32 omap3_arm_context[128];
+
 #define OMAP_CTRL_REGADDR(reg)          (omap2_ctrl_base + (reg))
 
 void __init omap2_set_globals_control(struct omap_globals *omap2_globals)
@@ -62,3 +134,134 @@ void omap_ctrl_writel(u32 val, u16 offset)
         __raw_writel(val, OMAP_CTRL_REGADDR(offset));
 }
 
+#ifdef CONFIG_ARCH_OMAP3
+/*
+ * Clears the scratchpad contents in case of cold boot-
+ * called during bootup
+ */
+void omap3_clear_scratchpad_contents(void)
+{
+        u32 max_offset = OMAP343X_SCRATCHPAD_ROM_OFFSET;
+        u32 *v_addr;
+        u32 offset = 0;
+        v_addr = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD_ROM);
+        if (prm_read_mod_reg(OMAP3430_GR_MOD, OMAP3_PRM_RSTST_OFFSET) &
+                OMAP3430_GLOBAL_COLD_RST) {
+                for ( ; offset <= max_offset; offset += 0x4)
+                        __raw_writel(0x0, (v_addr + offset));
+                prm_set_mod_reg_bits(OMAP3430_GLOBAL_COLD_RST, OMAP3430_GR_MOD,
+                        OMAP3_PRM_RSTST_OFFSET);
+        }
+}
+
+/* Populate the scratchpad structure with restore structure */
+void omap3_save_scratchpad_contents(void)
+{
+        void * __iomem scratchpad_address;
+        u32 arm_context_addr;
+        struct omap3_scratchpad scratchpad_contents;
+        struct omap3_scratchpad_prcm_block prcm_block_contents;
+        struct omap3_scratchpad_sdrc_block sdrc_block_contents;
+
+        /* Populate the Scratchpad contents */
+        scratchpad_contents.boot_config_ptr = 0x0;
+        scratchpad_contents.public_restore_ptr =
+                         virt_to_phys(get_restore_pointer());
+        scratchpad_contents.secure_ram_restore_ptr = 0x0;
+        scratchpad_contents.sdrc_module_semaphore = 0x0;
+        scratchpad_contents.prcm_block_offset = 0x2C;
+        scratchpad_contents.sdrc_block_offset = 0x64;
+
+        /* Populate the PRCM block contents */
+        prcm_block_contents.prm_clksrc_ctrl = prm_read_mod_reg(OMAP3430_GR_MOD,
+                        OMAP3_PRM_CLKSRC_CTRL_OFFSET);
+        prcm_block_contents.prm_clksel = prm_read_mod_reg(OMAP3430_CCR_MOD,
+                        OMAP3_PRM_CLKSEL_OFFSET);
+        prcm_block_contents.cm_clksel_core =
+                        cm_read_mod_reg(CORE_MOD, CM_CLKSEL);
+        prcm_block_contents.cm_clksel_wkup =
+                        cm_read_mod_reg(WKUP_MOD, CM_CLKSEL);
+        prcm_block_contents.cm_clken_pll =
+                        cm_read_mod_reg(PLL_MOD, OMAP3430_CM_CLKEN_PLL);
+        prcm_block_contents.cm_autoidle_pll =
+                        cm_read_mod_reg(PLL_MOD, OMAP3430_CM_AUTOIDLE_PLL);
+        prcm_block_contents.cm_clksel1_pll =
+                        cm_read_mod_reg(PLL_MOD, OMAP3430_CM_CLKSEL1_PLL);
+        prcm_block_contents.cm_clksel2_pll =
+                        cm_read_mod_reg(PLL_MOD, OMAP3430_CM_CLKSEL2_PLL);
+        prcm_block_contents.cm_clksel3_pll =
+                        cm_read_mod_reg(PLL_MOD, OMAP3430_CM_CLKSEL3);
+        prcm_block_contents.cm_clken_pll_mpu =
+                        cm_read_mod_reg(MPU_MOD, OMAP3430_CM_CLKEN_PLL);
+        prcm_block_contents.cm_autoidle_pll_mpu =
+                        cm_read_mod_reg(MPU_MOD, OMAP3430_CM_AUTOIDLE_PLL);
+        prcm_block_contents.cm_clksel1_pll_mpu =
+                        cm_read_mod_reg(MPU_MOD, OMAP3430_CM_CLKSEL1_PLL);
+        prcm_block_contents.cm_clksel2_pll_mpu =
+                        cm_read_mod_reg(MPU_MOD, OMAP3430_CM_CLKSEL2_PLL);
+        prcm_block_contents.prcm_block_size = 0x0;
+
+        /* Populate the SDRC block contents */
+        sdrc_block_contents.sysconfig =
+                        (sdrc_read_reg(SDRC_SYSCONFIG) & 0xFFFF);
+        sdrc_block_contents.cs_cfg =
+                        (sdrc_read_reg(SDRC_CS_CFG) & 0xFFFF);
+        sdrc_block_contents.sharing =
+                        (sdrc_read_reg(SDRC_SHARING) & 0xFFFF);
+        sdrc_block_contents.err_type =
+                        (sdrc_read_reg(SDRC_ERR_TYPE) & 0xFFFF);
+        sdrc_block_contents.dll_a_ctrl = sdrc_read_reg(SDRC_DLLA_CTRL);
+        sdrc_block_contents.dll_b_ctrl = 0x0;
+        sdrc_block_contents.power = sdrc_read_reg(SDRC_POWER);
+        sdrc_block_contents.cs_0 = 0x0;
+        sdrc_block_contents.mcfg_0 = sdrc_read_reg(SDRC_MCFG_0);
+        sdrc_block_contents.mr_0 = (sdrc_read_reg(SDRC_MR_0) & 0xFFFF);
+        sdrc_block_contents.emr_1_0 = 0x0;
+        sdrc_block_contents.emr_2_0 = 0x0;
+        sdrc_block_contents.emr_3_0 = 0x0;
+        sdrc_block_contents.actim_ctrla_0 =
+                        sdrc_read_reg(SDRC_ACTIM_CTRL_A_0);
+        sdrc_block_contents.actim_ctrlb_0 =
+                        sdrc_read_reg(SDRC_ACTIM_CTRL_B_0);
+        sdrc_block_contents.rfr_ctrl_0 =
+                        sdrc_read_reg(SDRC_RFR_CTRL_0);
+        sdrc_block_contents.cs_1 = 0x0;
+        sdrc_block_contents.mcfg_1 = sdrc_read_reg(SDRC_MCFG_1);
+        sdrc_block_contents.mr_1 = sdrc_read_reg(SDRC_MR_1) & 0xFFFF;
+        sdrc_block_contents.emr_1_1 = 0x0;
+        sdrc_block_contents.emr_2_1 = 0x0;
+        sdrc_block_contents.emr_3_1 = 0x0;
+        sdrc_block_contents.actim_ctrla_1 =
+                        sdrc_read_reg(SDRC_ACTIM_CTRL_A_1);
+        sdrc_block_contents.actim_ctrlb_1 =
+                        sdrc_read_reg(SDRC_ACTIM_CTRL_B_1);
+        sdrc_block_contents.rfr_ctrl_1 =
+                        sdrc_read_reg(SDRC_RFR_CTRL_1);
+        sdrc_block_contents.dcdl_1_ctrl = 0x0;
+        sdrc_block_contents.dcdl_2_ctrl = 0x0;
+        sdrc_block_contents.flags = 0x0;
+        sdrc_block_contents.block_size = 0x0;
+
+        arm_context_addr = virt_to_phys(omap3_arm_context);
+
+        /* Copy all the contents to the scratchpad location */
+        scratchpad_address = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD);
+        memcpy_toio(scratchpad_address, &scratchpad_contents,
+                 sizeof(scratchpad_contents));
+        /* Scratchpad contents being 32 bits, a divide by 4 done here */
+        memcpy_toio(scratchpad_address +
+                scratchpad_contents.prcm_block_offset,
+                &prcm_block_contents, sizeof(prcm_block_contents));
+        memcpy_toio(scratchpad_address +
+                scratchpad_contents.sdrc_block_offset,
+                &sdrc_block_contents, sizeof(sdrc_block_contents));
+        /*
+         * Copies the address of the location in SDRAM where ARM
+         * registers get saved during a MPU OFF transition.
+         */
+        memcpy_toio(scratchpad_address +
+                scratchpad_contents.sdrc_block_offset +
+                sizeof(sdrc_block_contents), &arm_context_addr, 4);
+}
+
+#endif /* CONFIG_ARCH_OMAP3 */
diff --git a/arch/arm/plat-omap/include/plat/control.h b/arch/arm/plat-omap/include/plat/control.h
index 835f5b7aa4b6..1076dd967390 100644
--- a/arch/arm/plat-omap/include/plat/control.h
+++ b/arch/arm/plat-omap/include/plat/control.h
@@ -207,6 +207,10 @@
 #define OMAP3_PADCONF_WAKEUPEVENT0      (1 << 15)
 #define OMAP3_PADCONF_WAKEUPENABLE0     (1 << 14)
 
+#define OMAP343X_SCRATCHPAD_ROM         (OMAP343X_CTRL_BASE + 0x860)
+#define OMAP343X_SCRATCHPAD             (OMAP343X_CTRL_BASE + 0x910)
+#define OMAP343X_SCRATCHPAD_ROM_OFFSET  0x19C
+
 #ifndef __ASSEMBLY__
 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) || \
                 defined(CONFIG_ARCH_OMAP4)
@@ -217,6 +221,12 @@ extern u32 omap_ctrl_readl(u16 offset);
 extern void omap_ctrl_writeb(u8 val, u16 offset);
 extern void omap_ctrl_writew(u16 val, u16 offset);
 extern void omap_ctrl_writel(u32 val, u16 offset);
+
+extern void omap3_save_scratchpad_contents(void);
+extern void omap3_clear_scratchpad_contents(void);
+extern u32 *get_restore_pointer(void);
+extern u32 omap3_arm_context[128];
+
 #else
 #define omap_ctrl_base_get()            0
 #define omap_ctrl_readb(x)              0