intel_mid_dma: Add sg list support to DMA driver

For a very high speed DMA various periphral devices need
scatter-gather list support. The DMA hardware support link list items.
This list can be circular also (adding new flag DMA_PREP_CIRCULAR_LIST)
Right now this flag is in driver header and should be moved to
dmaengine header file eventually

Signed-off-by: Ramesh Babu K V <ramesh.b.k.v@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 26 insertions, 4 deletions

diff --git a/drivers/dma/intel_mid_dma_regs.h b/drivers/dma/intel_mid_dma_regs.h
index a12dd2572dc..7a5ac56d132 100644
--- a/drivers/dma/intel_mid_dma_regs.h
+++ b/drivers/dma/intel_mid_dma_regs.h
@@ -29,11 +29,12 @@
 #include <linux/dmapool.h>
 #include <linux/pci_ids.h>
 
-#define INTEL_MID_DMA_DRIVER_VERSION "1.0.6"
+#define INTEL_MID_DMA_DRIVER_VERSION "1.1.0"
 
 #define REG_BIT0                0x00000001
 #define REG_BIT8                0x00000100
-
+#define INT_MASK_WE             0x8
+#define CLEAR_DONE              0xFFFFEFFF
 #define UNMASK_INTR_REG(chan_num) \
         ((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
 #define MASK_INTR_REG(chan_num) (REG_BIT8 << chan_num)
@@ -41,6 +42,9 @@
 #define ENABLE_CHANNEL(chan_num) \
         ((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
 
+#define DISABLE_CHANNEL(chan_num) \
+        (REG_BIT8 << chan_num)
+
 #define DESCS_PER_CHANNEL       16
 /*DMA Registers*/
 /*registers associated with channel programming*/
@@ -50,6 +54,7 @@
 /*CH X REG = (DMA_CH_SIZE)*CH_NO + REG*/
 #define SAR                     0x00 /* Source Address Register*/
 #define DAR                     0x08 /* Destination Address Register*/
+#define LLP                     0x10 /* Linked List Pointer Register*/
 #define CTL_LOW                 0x18 /* Control Register*/
 #define CTL_HIGH                0x1C /* Control Register*/
 #define CFG_LOW                 0x40 /* Configuration Register Low*/
@@ -112,8 +117,8 @@ union intel_mid_dma_ctl_lo {
 union intel_mid_dma_ctl_hi {
         struct {
                 u32     block_ts:12;    /*block transfer size*/
-                                        /*configured by DMAC*/
-                u32     reser:20;
+                u32     done:1;         /*Done - updated by DMAC*/
+                u32     reser:19;       /*configured by DMAC*/
         } ctlx;
         u32     ctl_hi;
 
@@ -169,6 +174,8 @@ union intel_mid_dma_cfg_hi {
  * @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
+ * @raw_tfr: raw trf interrupt recieved
+ * @raw_block: raw block interrupt recieved
  */
 struct intel_mid_dma_chan {
         struct dma_chan         chan;
@@ -185,6 +192,8 @@ struct intel_mid_dma_chan {
         struct middma_device    *dma;
         bool                    busy;
         bool                    in_use;
+        u32                     raw_tfr;
+        u32                     raw_block;
 };
 
 static inline struct intel_mid_dma_chan *to_intel_mid_dma_chan(
@@ -247,6 +256,11 @@ struct intel_mid_dma_desc {
         u32                             cfg_lo;
         u32                             ctl_lo;
         u32                             ctl_hi;
+        struct pci_pool                 *lli_pool;
+        struct intel_mid_dma_lli        *lli;
+        dma_addr_t                      lli_phys;
+        unsigned int                    lli_length;
+        unsigned int                    current_lli;
         dma_addr_t                      next;
         enum dma_data_direction         dirn;
         enum dma_status                 status;
@@ -255,6 +269,14 @@ struct intel_mid_dma_desc {
 
 };
 
+struct intel_mid_dma_lli {
+        dma_addr_t                      sar;
+        dma_addr_t                      dar;
+        dma_addr_t                      llp;
+        u32                             ctl_lo;
+        u32                             ctl_hi;
+} __attribute__ ((packed));
+
 static inline int test_ch_en(void __iomem *dma, u32 ch_no)
 {
         u32 en_reg = ioread32(dma + DMA_CHAN_EN);