intel_mid_dma: Add runtime PM support
This patch adds runtime PM support in this dma driver
for 4 PCI Controllers
Whenever the driver is idle (no channels grabbed), it
can go to low power state
It also adds the PCI suspend and resume support
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/dma/intel_mid_dma_regs.h b/drivers/dma/intel_mid_dma_regs.h
index d81aa65..a12dd25 100644
--- a/drivers/dma/intel_mid_dma_regs.h
+++ b/drivers/dma/intel_mid_dma_regs.h
@@ -29,7 +29,7 @@
#include <linux/dmapool.h>
#include <linux/pci_ids.h>
-#define INTEL_MID_DMA_DRIVER_VERSION "1.0.5"
+#define INTEL_MID_DMA_DRIVER_VERSION "1.0.6"
#define REG_BIT0 0x00000001
#define REG_BIT8 0x00000100
@@ -152,6 +152,7 @@
u32 cfg_hi;
};
+
/**
* struct intel_mid_dma_chan - internal mid representation of a DMA channel
* @chan: dma_chan strcture represetation for mid chan
@@ -166,6 +167,7 @@
* @slave: dma slave struture
* @descs_allocated: total number of decsiptors allocated
* @dma: dma device struture pointer
+ * @busy: bool representing if ch is busy (active txn) or not
* @in_use: bool representing if ch is in use or not
*/
struct intel_mid_dma_chan {
@@ -181,6 +183,7 @@
struct intel_mid_dma_slave *slave;
unsigned int descs_allocated;
struct middma_device *dma;
+ bool busy;
bool in_use;
};
@@ -190,6 +193,10 @@
return container_of(chan, struct intel_mid_dma_chan, chan);
}
+enum intel_mid_dma_state {
+ RUNNING = 0,
+ SUSPENDED,
+};
/**
* struct middma_device - internal representation of a DMA device
* @pdev: PCI device
@@ -205,6 +212,7 @@
* @max_chan: max number of chs supported (from drv_data)
* @block_size: Block size of DMA transfer supported (from drv_data)
* @pimr_mask: MMIO register addr for periphral interrupt (from drv_data)
+ * @state: dma PM device state
*/
struct middma_device {
struct pci_dev *pdev;
@@ -220,6 +228,7 @@
int max_chan;
int block_size;
unsigned int pimr_mask;
+ enum intel_mid_dma_state state;
};
static inline struct middma_device *to_middma_device(struct dma_device *common)
@@ -257,4 +266,7 @@
{
return container_of(txd, struct intel_mid_dma_desc, txd);
}
+
+int dma_resume(struct pci_dev *pci);
+
#endif /*__INTEL_MID_DMAC_REGS_H__*/