143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* linux/arch/arm/plat-samsung/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 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/amba/pl330.h>
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#include <linux/scatterlist.h>
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#include <linux/export.h>
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#include <mach/dma.h>
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static unsigned samsung_dmadev_request(enum dma_ch dma_ch,
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struct samsung_dma_req *param)
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{
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dma_cap_mask_t mask;
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void *filter_param;
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dma_cap_zero(mask);
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dma_cap_set(param->cap, mask);
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/*
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* If a dma channel property of a device node from device tree is
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* specified, use that as the fliter parameter.
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*/
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filter_param = (dma_ch == DMACH_DT_PROP) ?
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(void *)param->dt_dmach_prop : (void *)dma_ch;
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return (unsigned)dma_request_channel(mask, pl330_filter, filter_param);
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}
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static int samsung_dmadev_release(unsigned ch, void *param)
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{
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dma_release_channel((struct dma_chan *)ch);
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return 0;
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}
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static int samsung_dmadev_config(unsigned ch,
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struct samsung_dma_config *param)
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{
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struct dma_chan *chan = (struct dma_chan *)ch;
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struct dma_slave_config slave_config;
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if (param->direction == DMA_DEV_TO_MEM) {
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memset(&slave_config, 0, sizeof(struct dma_slave_config));
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slave_config.direction = param->direction;
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slave_config.src_addr = param->fifo;
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slave_config.src_addr_width = param->width;
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slave_config.src_maxburst = 1;
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dmaengine_slave_config(chan, &slave_config);
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} else if (param->direction == DMA_MEM_TO_DEV) {
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memset(&slave_config, 0, sizeof(struct dma_slave_config));
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slave_config.direction = param->direction;
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slave_config.dst_addr = param->fifo;
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slave_config.dst_addr_width = param->width;
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slave_config.dst_maxburst = 1;
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dmaengine_slave_config(chan, &slave_config);
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} else {
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pr_warn("unsupported direction\n");
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return -EINVAL;
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}
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return 0;
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}
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static int samsung_dmadev_prepare(unsigned ch,
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struct samsung_dma_prep *param)
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{
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struct scatterlist sg;
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struct dma_chan *chan = (struct dma_chan *)ch;
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struct dma_async_tx_descriptor *desc;
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switch (param->cap) {
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case DMA_SLAVE:
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sg_init_table(&sg, 1);
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sg_dma_len(&sg) = param->len;
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sg_set_page(&sg, pfn_to_page(PFN_DOWN(param->buf)),
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param->len, offset_in_page(param->buf));
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sg_dma_address(&sg) = param->buf;
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desc = dmaengine_prep_slave_sg(chan,
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&sg, 1, param->direction, DMA_PREP_INTERRUPT);
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break;
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case DMA_CYCLIC:
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desc = dmaengine_prep_dma_cyclic(chan, param->buf,
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param->len, param->period, param->direction,
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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break;
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default:
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dev_err(&chan->dev->device, "unsupported format\n");
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return -EFAULT;
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}
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if (!desc) {
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dev_err(&chan->dev->device, "cannot prepare cyclic dma\n");
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return -EFAULT;
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}
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desc->callback = param->fp;
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desc->callback_param = param->fp_param;
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dmaengine_submit((struct dma_async_tx_descriptor *)desc);
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return 0;
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}
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static inline int samsung_dmadev_trigger(unsigned ch)
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{
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dma_async_issue_pending((struct dma_chan *)ch);
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return 0;
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}
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static inline int samsung_dmadev_flush(unsigned ch)
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{
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return dmaengine_terminate_all((struct dma_chan *)ch);
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}
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static struct samsung_dma_ops dmadev_ops = {
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.request = samsung_dmadev_request,
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.release = samsung_dmadev_release,
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.config = samsung_dmadev_config,
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.prepare = samsung_dmadev_prepare,
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.trigger = samsung_dmadev_trigger,
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.started = NULL,
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.flush = samsung_dmadev_flush,
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.stop = samsung_dmadev_flush,
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};
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void *samsung_dmadev_get_ops(void)
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{
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return &dmadev_ops;
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}
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EXPORT_SYMBOL(samsung_dmadev_get_ops);
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