Merge branch 'next/devel-dma-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/dma

From Kukjin Kim <kgene.kim@samsung.com>:

Here is updating DMA common operation for Samsung SoCs.

Since some DMA client driver such as spi needs to change the configuration
after dma_request() so this branch adds dma_config() can configure DMA
transmit option which is included in dma_request() after that.

Note, according to the changes, needs to update spi and ASoC drivers
for Samsung SoCs and only got the ack from Mark Brown not Grant Likely
and as I know, he is busy for moving. But I think, the spi change has
no problem and it is simple.

* 'next/devel-dma-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
  ARM: SAMSUNG: Fix compiler warning in dma-ops.c file
  ASoC: follow the updated samsung DMA common operations
  spi/s3c64xx: Add the use of DMA config operation
  ARM: SAMSUNG: Add config() function in DMA common operations

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 76 insertions, 59 deletions

diff --git a/arch/arm/plat-samsung/dma-ops.c b/arch/arm/plat-samsung/dma-ops.c
index eb9f4f534006..c38d75489240 100644
--- a/arch/arm/plat-samsung/dma-ops.c
+++ b/arch/arm/plat-samsung/dma-ops.c
@@ -19,72 +19,79 @@
 #include <mach/dma.h>
 
 static unsigned samsung_dmadev_request(enum dma_ch dma_ch,
-                                struct samsung_dma_info *info)
+                                struct samsung_dma_req *param)
 {
-        struct dma_chan *chan;
         dma_cap_mask_t mask;
-        struct dma_slave_config slave_config;
         void *filter_param;
 
         dma_cap_zero(mask);
-        dma_cap_set(info->cap, mask);
+        dma_cap_set(param->cap, mask);
 
         /*
          * If a dma channel property of a device node from device tree is
          * specified, use that as the fliter parameter.
          */
-        filter_param = (dma_ch == DMACH_DT_PROP) ? (void *)info->dt_dmach_prop :
-                                (void *)dma_ch;
-        chan = dma_request_channel(mask, pl330_filter, filter_param);
+        filter_param = (dma_ch == DMACH_DT_PROP) ?
+                (void *)param->dt_dmach_prop : (void *)dma_ch;
+        return (unsigned)dma_request_channel(mask, pl330_filter, filter_param);
+}
+
+static int samsung_dmadev_release(unsigned ch, void *param)
+{
+        dma_release_channel((struct dma_chan *)ch);
 
-        if (info->direction == DMA_DEV_TO_MEM) {
+        return 0;
+}
+
+static int samsung_dmadev_config(unsigned ch,
+                                struct samsung_dma_config *param)
+{
+        struct dma_chan *chan = (struct dma_chan *)ch;
+        struct dma_slave_config slave_config;
+
+        if (param->direction == DMA_DEV_TO_MEM) {
                 memset(&slave_config, 0, sizeof(struct dma_slave_config));
-                slave_config.direction = info->direction;
-                slave_config.src_addr = info->fifo;
-                slave_config.src_addr_width = info->width;
+                slave_config.direction = param->direction;
+                slave_config.src_addr = param->fifo;
+                slave_config.src_addr_width = param->width;
                 slave_config.src_maxburst = 1;
                 dmaengine_slave_config(chan, &slave_config);
-        } else if (info->direction == DMA_MEM_TO_DEV) {
+        } else if (param->direction == DMA_MEM_TO_DEV) {
                 memset(&slave_config, 0, sizeof(struct dma_slave_config));
-                slave_config.direction = info->direction;
-                slave_config.dst_addr = info->fifo;
-                slave_config.dst_addr_width = info->width;
+                slave_config.direction = param->direction;
+                slave_config.dst_addr = param->fifo;
+                slave_config.dst_addr_width = param->width;
                 slave_config.dst_maxburst = 1;
                 dmaengine_slave_config(chan, &slave_config);
+        } else {
+                pr_warn("unsupported direction\n");
+                return -EINVAL;
         }
 
-        return (unsigned)chan;
-}
-
-static int samsung_dmadev_release(unsigned ch,
-                        struct s3c2410_dma_client *client)
-{
-        dma_release_channel((struct dma_chan *)ch);
-
         return 0;
 }
 
 static int samsung_dmadev_prepare(unsigned ch,
-                        struct samsung_dma_prep_info *info)
+                        struct samsung_dma_prep *param)
 {
         struct scatterlist sg;
         struct dma_chan *chan = (struct dma_chan *)ch;
         struct dma_async_tx_descriptor *desc;
 
-        switch (info->cap) {
+        switch (param->cap) {
         case DMA_SLAVE:
                 sg_init_table(&sg, 1);
-                sg_dma_len(&sg) = info->len;
-                sg_set_page(&sg, pfn_to_page(PFN_DOWN(info->buf)),
-                            info->len, offset_in_page(info->buf));
-                sg_dma_address(&sg) = info->buf;
+                sg_dma_len(&sg) = param->len;
+                sg_set_page(&sg, pfn_to_page(PFN_DOWN(param->buf)),
+                            param->len, offset_in_page(param->buf));
+                sg_dma_address(&sg) = param->buf;
 
                 desc = dmaengine_prep_slave_sg(chan,
-                        &sg, 1, info->direction, DMA_PREP_INTERRUPT);
+                        &sg, 1, param->direction, DMA_PREP_INTERRUPT);
                 break;
         case DMA_CYCLIC:
-                desc = dmaengine_prep_dma_cyclic(chan,
-                        info->buf, info->len, info->period, info->direction);
+                desc = dmaengine_prep_dma_cyclic(chan, param->buf,
+                        param->len, param->period, param->direction);
                 break;
         default:
                 dev_err(&chan->dev->device, "unsupported format\n");
@@ -96,8 +103,8 @@ static int samsung_dmadev_prepare(unsigned ch,
                 return -EFAULT;
         }
 
-        desc->callback = info->fp;
-        desc->callback_param = info->fp_param;
+        desc->callback = param->fp;
+        desc->callback_param = param->fp_param;
 
         dmaengine_submit((struct dma_async_tx_descriptor *)desc);
 
@@ -119,6 +126,7 @@ static inline int samsung_dmadev_flush(unsigned ch)
 static struct samsung_dma_ops dmadev_ops = {
         .request        = samsung_dmadev_request,
         .release        = samsung_dmadev_release,
+        .config         = samsung_dmadev_config,
         .prepare        = samsung_dmadev_prepare,
         .trigger        = samsung_dmadev_trigger,
         .started        = NULL,
diff --git a/arch/arm/plat-samsung/include/plat/dma-ops.h b/arch/arm/plat-samsung/include/plat/dma-ops.h
index 71a6827c7706..f5144cdd3001 100644
--- a/arch/arm/plat-samsung/include/plat/dma-ops.h
+++ b/arch/arm/plat-samsung/include/plat/dma-ops.h
@@ -16,7 +16,13 @@
 #include <linux/dmaengine.h>
 #include <mach/dma.h>
 
-struct samsung_dma_prep_info {
+struct samsung_dma_req {
+        enum dma_transaction_type cap;
+        struct property *dt_dmach_prop;
+        struct s3c2410_dma_client *client;
+};
+
+struct samsung_dma_prep {
         enum dma_transaction_type cap;
         enum dma_transfer_direction direction;
         dma_addr_t buf;
@@ -26,19 +32,17 @@ struct samsung_dma_prep_info {
         void *fp_param;
 };
 
-struct samsung_dma_info {
-        enum dma_transaction_type cap;
+struct samsung_dma_config {
         enum dma_transfer_direction direction;
         enum dma_slave_buswidth width;
         dma_addr_t fifo;
-        struct s3c2410_dma_client *client;
-        struct property *dt_dmach_prop;
 };
 
 struct samsung_dma_ops {
-        unsigned (*request)(enum dma_ch ch, struct samsung_dma_info *info);
-        int (*release)(unsigned ch, struct s3c2410_dma_client *client);
-        int (*prepare)(unsigned ch, struct samsung_dma_prep_info *info);
+        unsigned (*request)(enum dma_ch ch, struct samsung_dma_req *param);
+        int (*release)(unsigned ch, void *param);
+        int (*config)(unsigned ch, struct samsung_dma_config *param);
+        int (*prepare)(unsigned ch, struct samsung_dma_prep *param);
         int (*trigger)(unsigned ch);
         int (*started)(unsigned ch);
         int (*flush)(unsigned ch);
diff --git a/arch/arm/plat-samsung/s3c-dma-ops.c b/arch/arm/plat-samsung/s3c-dma-ops.c
index 781494912827..f99448c48d30 100644
--- a/arch/arm/plat-samsung/s3c-dma-ops.c
+++ b/arch/arm/plat-samsung/s3c-dma-ops.c
@@ -36,30 +36,26 @@ static void s3c_dma_cb(struct s3c2410_dma_chan *channel, void *param,
 }
 
 static unsigned s3c_dma_request(enum dma_ch dma_ch,
-                                 struct samsung_dma_info *info)
+                                        struct samsung_dma_req *param)
 {
         struct cb_data *data;
 
-        if (s3c2410_dma_request(dma_ch, info->client, NULL) < 0) {
-                s3c2410_dma_free(dma_ch, info->client);
+        if (s3c2410_dma_request(dma_ch, param->client, NULL) < 0) {
+                s3c2410_dma_free(dma_ch, param->client);
                 return 0;
         }
 
+        if (param->cap == DMA_CYCLIC)
+                s3c2410_dma_setflags(dma_ch, S3C2410_DMAF_CIRCULAR);
+
         data = kzalloc(sizeof(struct cb_data), GFP_KERNEL);
         data->ch = dma_ch;
         list_add_tail(&data->node, &dma_list);
 
-        s3c2410_dma_devconfig(dma_ch, info->direction, info->fifo);
-
-        if (info->cap == DMA_CYCLIC)
-                s3c2410_dma_setflags(dma_ch, S3C2410_DMAF_CIRCULAR);
-
-        s3c2410_dma_config(dma_ch, info->width);
-
         return (unsigned)dma_ch;
 }
 
-static int s3c_dma_release(unsigned ch, struct s3c2410_dma_client *client)
+static int s3c_dma_release(unsigned ch, void *param)
 {
         struct cb_data *data;
 
@@ -68,16 +64,24 @@ static int s3c_dma_release(unsigned ch, struct s3c2410_dma_client *client)
                         break;
         list_del(&data->node);
 
-        s3c2410_dma_free(ch, client);
+        s3c2410_dma_free(ch, param);
         kfree(data);
 
         return 0;
 }
 
-static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep_info *info)
+static int s3c_dma_config(unsigned ch, struct samsung_dma_config *param)
+{
+        s3c2410_dma_devconfig(ch, param->direction, param->fifo);
+        s3c2410_dma_config(ch, param->width);
+
+        return 0;
+}
+
+static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep *param)
 {
         struct cb_data *data;
-        int len = (info->cap == DMA_CYCLIC) ? info->period : info->len;
+        int len = (param->cap == DMA_CYCLIC) ? param->period : param->len;
 
         list_for_each_entry(data, &dma_list, node)
                 if (data->ch == ch)
@@ -85,11 +89,11 @@ static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep_info *info)
 
         if (!data->fp) {
                 s3c2410_dma_set_buffdone_fn(ch, s3c_dma_cb);
-                data->fp = info->fp;
-                data->fp_param = info->fp_param;
+                data->fp = param->fp;
+                data->fp_param = param->fp_param;
         }
 
-        s3c2410_dma_enqueue(ch, (void *)data, info->buf, len);
+        s3c2410_dma_enqueue(ch, (void *)data, param->buf, len);
 
         return 0;
 }
@@ -117,6 +121,7 @@ static inline int s3c_dma_stop(unsigned ch)
 static struct samsung_dma_ops s3c_dma_ops = {
         .request        = s3c_dma_request,
         .release        = s3c_dma_release,
+        .config         = s3c_dma_config,
         .prepare        = s3c_dma_prepare,
         .trigger        = s3c_dma_trigger,
         .started        = s3c_dma_started,