68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
|
#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)
|
||
|
|
|
||
|
|
#elif defined(CONFIG_ARCH_AT91CAP9)
|
||
|
|
#include <mach/at91cap9_ddrsdr.h>
|
||
|
|
|
||
|
|
|
||
|
|
static inline u32 sdram_selfrefresh_enable(void)
|
||
|
|
{
|
||
|
|
u32 saved_lpr, lpr;
|
||
|
|
|
||
|
|
saved_lpr = at91_sys_read(AT91_DDRSDRC_LPR);
|
||
|
|
|
||
|
|
lpr = saved_lpr & ~AT91_DDRSDRC_LPCB;
|
||
|
|
at91_sys_write(AT91_DDRSDRC_LPR, lpr | AT91_DDRSDRC_LPCB_SELF_REFRESH);
|
||
|
|
return saved_lpr;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define sdram_selfrefresh_disable(saved_lpr) at91_sys_write(AT91_DDRSDRC_LPR, saved_lpr)
|
||
|
|
|
||
|
|
#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.
|
||
|
|
*/
|
||
|
|
#define AT91_SDRAMC AT91_SDRAMC0
|
||
|
|
#warning Assuming EB1 SDRAM controller is *NOT* used
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static inline u32 sdram_selfrefresh_enable(void)
|
||
|
|
{
|
||
|
|
u32 saved_lpr, lpr;
|
||
|
|
|
||
|
|
saved_lpr = at91_sys_read(AT91_SDRAMC_LPR);
|
||
|
|
|
||
|
|
lpr = saved_lpr & ~AT91_SDRAMC_LPCB;
|
||
|
|
at91_sys_write(AT91_SDRAMC_LPR, lpr | AT91_SDRAMC_LPCB_SELF_REFRESH);
|
||
|
|
return saved_lpr;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define sdram_selfrefresh_disable(saved_lpr) at91_sys_write(AT91_SDRAMC_LPR, saved_lpr)
|
||
|
|
|
||
|
|
#endif
|