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pm.h
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#ifdef CONFIG_ARCH_AT91RM9200 #include <mach/at91rm9200_mc.h> /* * The AT91RM9200 goes into self-refresh mode with this command, and will * terminate self-refresh automatically on the next SDRAM access. * * Self-refresh mode is exited as soon as a memory access is made, but we don't * know for sure when that happens. However, we need to restore the low-power * mode if it was enabled before going idle. Restoring low-power mode while * still in self-refresh is "not recommended", but seems to work. */ static inline u32 sdram_selfrefresh_enable(void) { u32 saved_lpr = at91_sys_read(AT91_SDRAMC_LPR); at91_sys_write(AT91_SDRAMC_LPR, 0); at91_sys_write(AT91_SDRAMC_SRR, 1); return saved_lpr; } #define sdram_selfrefresh_disable(saved_lpr) \ at91_sys_write(AT91_SDRAMC_LPR, saved_lpr) #define wait_for_interrupt_enable() \ asm volatile ("mcr p15, 0, %0, c7, c0, 4" \ : : "r" (0)) #elif defined(CONFIG_ARCH_AT91SAM9G45) #include <mach/at91sam9_ddrsdr.h> /* We manage both DDRAM/SDRAM controllers, we need more than one value to * remember. */ static u32 saved_lpr1; static inline u32 sdram_selfrefresh_enable(void) { /* Those tow values allow us to delay self-refresh activation * to the maximum. */ u32 lpr0, lpr1; u32 saved_lpr0; saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR); lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB; lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH; saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR); lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB; lpr0 |= AT91_DDRSDRC_LPCB_SELF_REFRESH; /* self-refresh mode now */ at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0); at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1); return saved_lpr0; } #define sdram_selfrefresh_disable(saved_lpr0) \ do { \ at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0); \ at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1); \ } while (0) #define wait_for_interrupt_enable() cpu_do_idle() #else #include <mach/at91sam9_sdramc.h> #ifdef CONFIG_ARCH_AT91SAM9263 /* * FIXME either or both the SDRAM controllers (EB0, EB1) might be in use; * handle those cases both here and in the Suspend-To-RAM support. */ #warning Assuming EB1 SDRAM controller is *NOT* used #endif static inline u32 sdram_selfrefresh_enable(void) { u32 saved_lpr, lpr; saved_lpr = at91_ramc_read(0, AT91_SDRAMC_LPR); lpr = saved_lpr & ~AT91_SDRAMC_LPCB; at91_ramc_write(0, AT91_SDRAMC_LPR, lpr | AT91_SDRAMC_LPCB_SELF_REFRESH); return saved_lpr; } #define sdram_selfrefresh_disable(saved_lpr) \ at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr) #define wait_for_interrupt_enable() \ cpu_do_idle() #endif
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