1 /* linux/arch/arm/plat-samsung/s3c-dma-ops.c
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
6 * Samsung S3C-DMA Operations
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/types.h>
24 struct list_head node;
27 static LIST_HEAD(dma_list);
29 static void s3c_dma_cb(struct s3c2410_dma_chan *channel, void *param,
30 int size, enum s3c2410_dma_buffresult res)
32 struct cb_data *data = param;
34 data->fp(data->fp_param);
37 static unsigned s3c_dma_request(enum dma_ch dma_ch,
38 struct samsung_dma_info *info)
42 if (s3c2410_dma_request(dma_ch, info->client, NULL) < 0) {
43 s3c2410_dma_free(dma_ch, info->client);
47 data = kzalloc(sizeof(struct cb_data), GFP_KERNEL);
49 list_add_tail(&data->node, &dma_list);
51 s3c2410_dma_devconfig(dma_ch, info->direction, info->fifo);
53 if (info->cap == DMA_CYCLIC)
54 s3c2410_dma_setflags(dma_ch, S3C2410_DMAF_CIRCULAR);
56 s3c2410_dma_config(dma_ch, info->width);
58 return (unsigned)dma_ch;
61 static int s3c_dma_release(unsigned ch, struct s3c2410_dma_client *client)
65 list_for_each_entry(data, &dma_list, node)
68 list_del(&data->node);
70 s3c2410_dma_free(ch, client);
76 static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep_info *info)
79 int len = (info->cap == DMA_CYCLIC) ? info->period : info->len;
81 list_for_each_entry(data, &dma_list, node)
86 s3c2410_dma_set_buffdone_fn(ch, s3c_dma_cb);
88 data->fp_param = info->fp_param;
91 s3c2410_dma_enqueue(ch, (void *)data, info->buf, len);
96 static inline int s3c_dma_trigger(unsigned ch)
98 return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_START);
101 static inline int s3c_dma_started(unsigned ch)
103 return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STARTED);
106 static inline int s3c_dma_flush(unsigned ch)
108 return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_FLUSH);
111 static inline int s3c_dma_stop(unsigned ch)
113 return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STOP);
116 static struct samsung_dma_ops s3c_dma_ops = {
117 .request = s3c_dma_request,
118 .release = s3c_dma_release,
119 .prepare = s3c_dma_prepare,
120 .trigger = s3c_dma_trigger,
121 .started = s3c_dma_started,
122 .flush = s3c_dma_flush,
123 .stop = s3c_dma_stop,
126 void *s3c_dma_get_ops(void)
130 EXPORT_SYMBOL(s3c_dma_get_ops);