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| author | Peter Pearse <peter.pearse@arm.com> | 2007-04-19 13:17:20 +0100 |
|---|---|---|
| committer | Peter Pearse <peter.pearse@arm.com> | 2007-04-19 13:17:20 +0100 |
| commit | ee89bf2782406b1f87088b4764aeb6f811d82526 (patch) | |
| tree | b144476f4b5e92a414efff165d214d34062d4365 /board/icecube/icecube.c | |
| parent | 9c00dfb0bf89c8c23e8af5b5bdf49cf66d769f85 (diff) | |
| parent | 37837828d89084879bee2f2b8c7c68d4695940df (diff) | |
| download | u-boot-imx-ee89bf2782406b1f87088b4764aeb6f811d82526.zip u-boot-imx-ee89bf2782406b1f87088b4764aeb6f811d82526.tar.gz u-boot-imx-ee89bf2782406b1f87088b4764aeb6f811d82526.tar.bz2 | |
Merge with git://www.denx.de/git/u-boot.git
Diffstat (limited to 'board/icecube/icecube.c')
| -rw-r--r-- | board/icecube/icecube.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/board/icecube/icecube.c b/board/icecube/icecube.c index 700c9d9..2960998 100644 --- a/board/icecube/icecube.c +++ b/board/icecube/icecube.c @@ -42,6 +42,53 @@ #include "mt48lc16m16a2-75.h" # endif #endif + +#ifdef CONFIG_LITE5200B_PM +/* u-boot part of low-power mode implementation */ +#define SAVED_ADDR (*(void **)0x00000000) +#define PSC2_4 0x02 + +void lite5200b_wakeup(void) +{ + unsigned char wakeup_pin; + void (*linux_wakeup)(void); + + /* check PSC2_4, if it's down "QT" is signaling we have a wakeup + * from low power mode */ + *(vu_char *)MPC5XXX_WU_GPIO_ENABLE = PSC2_4; + __asm__ volatile ("sync"); + + wakeup_pin = *(vu_char *)MPC5XXX_WU_GPIO_DATA_I; + if (wakeup_pin & PSC2_4) + return; + + /* acknowledge to "QT" + * by holding pin at 1 for 10 uS */ + *(vu_char *)MPC5XXX_WU_GPIO_DIR = PSC2_4; + __asm__ volatile ("sync"); + *(vu_char *)MPC5XXX_WU_GPIO_DATA_O = PSC2_4; + __asm__ volatile ("sync"); + udelay(10); + + /* put ram out of self-refresh */ + *(vu_long *)MPC5XXX_SDRAM_CTRL |= 0x80000000; /* mode_en */ + __asm__ volatile ("sync"); + *(vu_long *)MPC5XXX_SDRAM_CTRL |= 0x50000000; /* cke ref_en */ + __asm__ volatile ("sync"); + *(vu_long *)MPC5XXX_SDRAM_CTRL &= ~0x80000000; /* !mode_en */ + __asm__ volatile ("sync"); + udelay(10); /* wait a bit */ + + /* jump back to linux kernel code */ + linux_wakeup = SAVED_ADDR; + printf("\n\nLooks like we just woke, transferring control to 0x%08lx\n", + linux_wakeup); + linux_wakeup(); +} +#else +#define lite5200b_wakeup() +#endif + #ifndef CFG_RAMBOOT static void sdram_start (int hi_addr) { @@ -208,6 +255,8 @@ long int initdram (int board_type) __asm__ volatile ("sync"); } + lite5200b_wakeup(); + return dramsize + dramsize2; } |