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| author |   Michael Hennerich <michael.hennerich@analog.com> | 2008-07-19 16:57:32 +0800 |
|---|---|---|
| committer |   Bryan Wu <cooloney@kernel.org> | 2008-07-19 16:57:32 +0800 |
| commit | 1efc80b53eb54770139219f99657abd92595fc86 (patch) | |
| tree | 254c76b3aaf22110b116e67a8118945006cacce6 /arch/blackfin/kernel/bfin_dma_5xx.c | |
| parent | Blackfin arch: Fix BUG - JUMP error in kernel (relocation truncated to fit: R_pcrel12_jump_s) (diff) | |
| download | linux-dev-1efc80b53eb54770139219f99657abd92595fc86.tar.xz linux-dev-1efc80b53eb54770139219f99657abd92595fc86.zip | |
Blackfin arch: Functional power management support
Enable: PM_SUSPEND_MEM -> Blackfin Hibernate to SDRAM
This feature requires a special bootloader (u-boot)
supporting return from hibernate.
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/blackfin/kernel/bfin_dma_5xx.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c index d54f19085f37..ad0e75845ac2 100644 --- a/arch/blackfin/kernel/bfin_dma_5xx.c +++ b/arch/blackfin/kernel/bfin_dma_5xx.c @@ -472,6 +472,32 @@ unsigned long get_dma_curr_addr(unsigned int channel) } EXPORT_SYMBOL(get_dma_curr_addr); +#ifdef CONFIG_PM +int blackfin_dma_suspend(void) +{ + int i; + + for (i = 0; i < MAX_BLACKFIN_DMA_CHANNEL; i++) { + if (dma_ch[i].chan_status == DMA_CHANNEL_ENABLED) { + printk(KERN_ERR "DMA Channel %d failed to suspend\n", i); + return -EBUSY; + } + + dma_ch[i].saved_peripheral_map = dma_ch[i].regs->peripheral_map; + } + + return 0; +} + +void blackfin_dma_resume(void) +{ + int i; + + for (i = 0; i < MAX_BLACKFIN_DMA_CHANNEL; i++) + dma_ch[i].regs->peripheral_map = dma_ch[i].saved_peripheral_map; +} +#endif + static void *__dma_memcpy(void *dest, const void *src, size_t size) { int direction; /* 1 - address decrease, 0 - address increase */ |