1 files changed, 130 insertions, 0 deletions

diff --git a/arch/arm/plat-samsung/s3c-dma-ops.c b/arch/arm/plat-samsung/s3c-dma-ops.c
new file mode 100644
index 000000000000..582333c70585
--- /dev/null
+++ b/arch/arm/plat-samsung/s3c-dma-ops.c
@@ -0,0 +1,130 @@
+/* linux/arch/arm/plat-samsung/s3c-dma-ops.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * Samsung S3C-DMA Operations
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <mach/dma.h>
+
+struct cb_data {
+        void (*fp) (void *);
+        void *fp_param;
+        unsigned ch;
+        struct list_head node;
+};
+
+static LIST_HEAD(dma_list);
+
+static void s3c_dma_cb(struct s3c2410_dma_chan *channel, void *param,
+                       int size, enum s3c2410_dma_buffresult res)
+{
+        struct cb_data *data = param;
+
+        data->fp(data->fp_param);
+}
+
+static unsigned s3c_dma_request(enum dma_ch dma_ch,
+                                 struct samsung_dma_info *info)
+{
+        struct cb_data *data;
+
+        if (s3c2410_dma_request(dma_ch, info->client, NULL) < 0) {
+                s3c2410_dma_free(dma_ch, info->client);
+                return 0;
+        }
+
+        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)
+{
+        struct cb_data *data;
+
+        list_for_each_entry(data, &dma_list, node)
+                if (data->ch == ch)
+                        break;
+        list_del(&data->node);
+
+        s3c2410_dma_free(ch, client);
+        kfree(data);
+
+        return 0;
+}
+
+static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep_info *info)
+{
+        struct cb_data *data;
+        int len = (info->cap == DMA_CYCLIC) ? info->period : info->len;
+
+        list_for_each_entry(data, &dma_list, node)
+                if (data->ch == ch)
+                        break;
+
+        if (!data->fp) {
+                s3c2410_dma_set_buffdone_fn(ch, s3c_dma_cb);
+                data->fp = info->fp;
+                data->fp_param = info->fp_param;
+        }
+
+        s3c2410_dma_enqueue(ch, (void *)data, info->buf, len);
+
+        return 0;
+}
+
+static inline int s3c_dma_trigger(unsigned ch)
+{
+        return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_START);
+}
+
+static inline int s3c_dma_started(unsigned ch)
+{
+        return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STARTED);
+}
+
+static inline int s3c_dma_flush(unsigned ch)
+{
+        return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_FLUSH);
+}
+
+static inline int s3c_dma_stop(unsigned ch)
+{
+        return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STOP);
+}
+
+static struct samsung_dma_ops s3c_dma_ops = {
+        .request        = s3c_dma_request,
+        .release        = s3c_dma_release,
+        .prepare        = s3c_dma_prepare,
+        .trigger        = s3c_dma_trigger,
+        .started        = s3c_dma_started,
+        .flush          = s3c_dma_flush,
+        .stop           = s3c_dma_stop,
+};
+
+void *s3c_dma_get_ops(void)
+{
+        return &s3c_dma_ops;
+}
+EXPORT_SYMBOL(s3c_dma_get_ops);