From 57f277b0122722ffa1de1b53aceb70646ce9a8e1 Mon Sep 17 00:00:00 2001 From: Rajendra Nayak Date: Fri, 26 Sep 2008 17:49:34 +0530 Subject: [PATCH] OMAP3: PM: Restore MMU table entry During the MMU restoration on the restore path from MPU OFF, the page table entry for the page consisting of the code being executed is modified to make MMU return VA=PA. The MMU is then enabled and the original entry is being stored in scratchpad. This patch reads the original values stored in scratchpad, and restores them back. Signed-off-by: Rajendra Nayak Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/pm34xx.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index 05ee05f012ad..8b5bf91dc070 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -29,6 +29,8 @@ #include #include +#include + #include "cm.h" #include "cm-regbits-34xx.h" #include "prm-regbits-34xx.h" @@ -164,6 +166,35 @@ static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id) return IRQ_HANDLED; } +static void restore_control_register(u32 val) +{ + __asm__ __volatile__ ("mcr p15, 0, %0, c1, c0, 0" : : "r" (val)); +} + +/* Function to restore the table entry that was modified for enabling MMU */ +static void restore_table_entry(void) +{ + u32 *scratchpad_address; + u32 previous_value, control_reg_value; + u32 *address; + + scratchpad_address = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD); + + /* Get address of entry that was modified */ + address = (u32 *)__raw_readl(scratchpad_address + + OMAP343X_TABLE_ADDRESS_OFFSET); + /* Get the previous value which needs to be restored */ + previous_value = __raw_readl(scratchpad_address + + OMAP343X_TABLE_VALUE_OFFSET); + address = __va(address); + *address = previous_value; + flush_tlb_all(); + control_reg_value = __raw_readl(scratchpad_address + + OMAP343X_CONTROL_REG_VALUE_OFFSET); + /* This will enable caches and prediction */ + restore_control_register(control_reg_value); +} + static void omap_sram_idle(void) { /* Variable to tell what needs to be saved and restored @@ -220,6 +251,10 @@ static void omap_sram_idle(void) _omap_sram_idle(NULL, save_state); cpu_init(); + /* Restore table entry modified during MMU restoration */ + if (pwrdm_read_prev_pwrst(mpu_pwrdm) == PWRDM_POWER_OFF) + restore_table_entry(); + if (core_next_state < PWRDM_POWER_ON) { if (per_next_state < PWRDM_POWER_ON) omap_uart_resume_idle(2);