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Diffstat (limited to 'arch/arm/plat-samsung/s3c-dma-ops.c')
-rw-r--r--arch/arm/plat-samsung/s3c-dma-ops.c130
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);