147 строки
3.1 KiB
C
147 строки
3.1 KiB
C
/* 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 <linux/export.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_req *param,
|
|
struct device *dev, char *ch_name)
|
|
{
|
|
struct cb_data *data;
|
|
|
|
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);
|
|
|
|
return (unsigned)dma_ch;
|
|
}
|
|
|
|
static int s3c_dma_release(unsigned ch, void *param)
|
|
{
|
|
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, param);
|
|
kfree(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
dma_addr_t pos = param->buf;
|
|
dma_addr_t end = param->buf + param->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 = param->fp;
|
|
data->fp_param = param->fp_param;
|
|
}
|
|
|
|
if (param->cap != DMA_CYCLIC) {
|
|
s3c2410_dma_enqueue(ch, (void *)data, param->buf, param->len);
|
|
return 0;
|
|
}
|
|
|
|
while (pos < end) {
|
|
s3c2410_dma_enqueue(ch, (void *)data, pos, param->period);
|
|
pos += param->period;
|
|
}
|
|
|
|
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,
|
|
.config = s3c_dma_config,
|
|
.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);
|