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| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2011-07-27 14:21:29 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2011-08-19 15:09:54 +0200 |
| commit | c0ba5947370a0900b1823922fc4faf41515bc901 (patch) | |
| tree | f3c32b76f48fc7f78ebd32a6d33f5e6b99e1328a /drivers/dma/at_hdmac_regs.h | |
| parent | dmaengine: at_hdmac: replace spin_lock* with irqsave variants (diff) | |
| download | linux-c0ba5947370a0900b1823922fc4faf41515bc901.tar.xz linux-c0ba5947370a0900b1823922fc4faf41515bc901.zip | |
dmaengine: at_hdmac: improve power management routines
Save/restore dma controller state across a suspend-resume sequence.
The prepare() function will wait for the non-cyclic channels to become idle.
It also deals with cyclic operations with the start at next period while
resuming.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/at_hdmac_regs.h')
| -rw-r--r-- | drivers/dma/at_hdmac_regs.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h index 087dbf1dd39c..6f0c4a3eb091 100644 --- a/drivers/dma/at_hdmac_regs.h +++ b/drivers/dma/at_hdmac_regs.h @@ -204,6 +204,9 @@ enum atc_status { * @status: transmit status information from irq/prep* functions * to tasklet (use atomic operations) * @tasklet: bottom half to finish transaction work + * @save_cfg: configuration register that is saved on suspend/resume cycle + * @save_dscr: for cyclic operations, preserve next descriptor address in + * the cyclic list on suspend/resume cycle * @lock: serializes enqueue/dequeue operations to descriptors lists * @completed_cookie: identifier for the most recently completed operation * @active_list: list of descriptors dmaengine is being running on @@ -218,6 +221,8 @@ struct at_dma_chan { u8 mask; unsigned long status; struct tasklet_struct tasklet; + u32 save_cfg; + u32 save_dscr; spinlock_t lock; @@ -248,6 +253,7 @@ static inline struct at_dma_chan *to_at_dma_chan(struct dma_chan *dchan) * @chan_common: common dmaengine dma_device object members * @ch_regs: memory mapped register base * @clk: dma controller clock + * @save_imr: interrupt mask register that is saved on suspend/resume cycle * @all_chan_mask: all channels availlable in a mask * @dma_desc_pool: base of DMA descriptor region (DMA address) * @chan: channels table to store at_dma_chan structures @@ -256,6 +262,7 @@ struct at_dma { struct dma_device dma_common; void __iomem *regs; struct clk *clk; + u32 save_imr; u8 all_chan_mask; |