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fbb20e81bd
This patch adds config() that configures DMA transmit option. This function was originally included in request(). But, Some DMA client driver requires to change the configuration after request(). So, This patch picks up it from request(). Signed-off-by: Boojin Kim <boojin.kim@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
/* linux/arch/arm/plat-samsung/s3c-dma-ops.c
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Samsung S3C-DMA Operations
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/export.h>
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#include <mach/dma.h>
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struct cb_data {
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void (*fp) (void *);
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void *fp_param;
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unsigned ch;
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struct list_head node;
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};
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static LIST_HEAD(dma_list);
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static void s3c_dma_cb(struct s3c2410_dma_chan *channel, void *param,
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int size, enum s3c2410_dma_buffresult res)
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{
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struct cb_data *data = param;
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data->fp(data->fp_param);
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}
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static unsigned s3c_dma_request(enum dma_ch dma_ch,
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struct samsung_dma_req *param)
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{
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struct cb_data *data;
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if (s3c2410_dma_request(dma_ch, param->client, NULL) < 0) {
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s3c2410_dma_free(dma_ch, param->client);
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return 0;
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}
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if (param->cap == DMA_CYCLIC)
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s3c2410_dma_setflags(dma_ch, S3C2410_DMAF_CIRCULAR);
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data = kzalloc(sizeof(struct cb_data), GFP_KERNEL);
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data->ch = dma_ch;
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list_add_tail(&data->node, &dma_list);
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return (unsigned)dma_ch;
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}
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static int s3c_dma_release(unsigned ch, void *param)
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{
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struct cb_data *data;
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list_for_each_entry(data, &dma_list, node)
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if (data->ch == ch)
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break;
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list_del(&data->node);
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s3c2410_dma_free(ch, param);
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kfree(data);
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return 0;
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}
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static int s3c_dma_config(unsigned ch, struct samsung_dma_config *param)
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{
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s3c2410_dma_devconfig(ch, param->direction, param->fifo);
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s3c2410_dma_config(ch, param->width);
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return 0;
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}
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static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep *param)
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{
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struct cb_data *data;
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int len = (param->cap == DMA_CYCLIC) ? param->period : param->len;
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list_for_each_entry(data, &dma_list, node)
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if (data->ch == ch)
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break;
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if (!data->fp) {
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s3c2410_dma_set_buffdone_fn(ch, s3c_dma_cb);
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data->fp = param->fp;
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data->fp_param = param->fp_param;
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}
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s3c2410_dma_enqueue(ch, (void *)data, param->buf, len);
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return 0;
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}
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static inline int s3c_dma_trigger(unsigned ch)
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{
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return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_START);
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}
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static inline int s3c_dma_started(unsigned ch)
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{
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return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STARTED);
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}
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static inline int s3c_dma_flush(unsigned ch)
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{
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return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_FLUSH);
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}
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static inline int s3c_dma_stop(unsigned ch)
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{
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return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STOP);
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}
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static struct samsung_dma_ops s3c_dma_ops = {
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.request = s3c_dma_request,
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.release = s3c_dma_release,
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.config = s3c_dma_config,
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.prepare = s3c_dma_prepare,
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.trigger = s3c_dma_trigger,
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.started = s3c_dma_started,
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.flush = s3c_dma_flush,
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.stop = s3c_dma_stop,
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};
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void *s3c_dma_get_ops(void)
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{
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return &s3c_dma_ops;
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}
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EXPORT_SYMBOL(s3c_dma_get_ops);
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