arch/arm/mach-at91/pm.h

   1 #ifdef CONFIG_ARCH_AT91RM9200
   2 #include <mach/at91rm9200_mc.h>
   3
   4 /*
   5  * The AT91RM9200 goes into self-refresh mode with this command, and will
   6  * terminate self-refresh automatically on the next SDRAM access.
   7  *
   8  * Self-refresh mode is exited as soon as a memory access is made, but we don't
   9  * know for sure when that happens. However, we need to restore the low-power
  10  * mode if it was enabled before going idle. Restoring low-power mode while
  11  * still in self-refresh is "not recommended", but seems to work.
  12  */
  13
  14 static inline u32 sdram_selfrefresh_enable(void)
  15 {
  16         u32 saved_lpr = at91_sys_read(AT91_SDRAMC_LPR);
  17
  18         at91_sys_write(AT91_SDRAMC_LPR, 0);
  19         at91_sys_write(AT91_SDRAMC_SRR, 1);
  20         return saved_lpr;
  21 }
  22
  23 #define sdram_selfrefresh_disable(saved_lpr)    at91_sys_write(AT91_SDRAMC_LPR, saved_lpr)
  24
  25 #elif defined(CONFIG_ARCH_AT91CAP9)
  26 #include <mach/at91cap9_ddrsdr.h>
  27
  28
  29 static inline u32 sdram_selfrefresh_enable(void)
  30 {
  31         u32 saved_lpr, lpr;
  32
  33         saved_lpr = at91_sys_read(AT91_DDRSDRC_LPR);
  34
  35         lpr = saved_lpr & ~AT91_DDRSDRC_LPCB;
  36         at91_sys_write(AT91_DDRSDRC_LPR, lpr | AT91_DDRSDRC_LPCB_SELF_REFRESH);
  37         return saved_lpr;
  38 }
  39
  40 #define sdram_selfrefresh_disable(saved_lpr)    at91_sys_write(AT91_DDRSDRC_LPR, saved_lpr)
  41
  42 #else
  43 #include <mach/at91sam9_sdramc.h>
  44
  45 #ifdef CONFIG_ARCH_AT91SAM9263
  46 /*
  47  * FIXME either or both the SDRAM controllers (EB0, EB1) might be in use;
  48  * handle those cases both here and in the Suspend-To-RAM support.
  49  */
  50 #define AT91_SDRAMC     AT91_SDRAMC0
  51 #warning Assuming EB1 SDRAM controller is *NOT* used
  52 #endif
  53
  54 static inline u32 sdram_selfrefresh_enable(void)
  55 {
  56         u32 saved_lpr, lpr;
  57
  58         saved_lpr = at91_sys_read(AT91_SDRAMC_LPR);
  59
  60         lpr = saved_lpr & ~AT91_SDRAMC_LPCB;
  61         at91_sys_write(AT91_SDRAMC_LPR, lpr | AT91_SDRAMC_LPCB_SELF_REFRESH);
  62         return saved_lpr;
  63 }
  64
  65 #define sdram_selfrefresh_disable(saved_lpr)    at91_sys_write(AT91_SDRAMC_LPR, saved_lpr)
  66
  67 #endif