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3e2ec13a81
The dma channel selection filter function is moved from plat-samsung into the pl330 driver. In additon to that, a check is added in the filter function to ensure that the channel on which the filter has been invoked is pl330 channel instance (and avoid any incorrect access of chan->private in a system with multiple types of DMA drivers). Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Jassi Brar <jassisinghbrar@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
127 lines
3.1 KiB
C
127 lines
3.1 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_info *info)
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{
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struct dma_chan *chan;
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dma_cap_mask_t mask;
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struct dma_slave_config slave_config;
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dma_cap_zero(mask);
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dma_cap_set(info->cap, mask);
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chan = dma_request_channel(mask, pl330_filter, (void *)dma_ch);
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if (info->direction == DMA_FROM_DEVICE) {
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memset(&slave_config, 0, sizeof(struct dma_slave_config));
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slave_config.direction = info->direction;
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slave_config.src_addr = info->fifo;
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slave_config.src_addr_width = info->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 (info->direction == DMA_TO_DEVICE) {
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memset(&slave_config, 0, sizeof(struct dma_slave_config));
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slave_config.direction = info->direction;
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slave_config.dst_addr = info->fifo;
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slave_config.dst_addr_width = info->width;
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slave_config.dst_maxburst = 1;
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dmaengine_slave_config(chan, &slave_config);
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}
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return (unsigned)chan;
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}
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static int samsung_dmadev_release(unsigned ch,
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struct s3c2410_dma_client *client)
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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_prepare(unsigned ch,
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struct samsung_dma_prep_info *info)
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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 (info->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) = info->len;
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sg_set_page(&sg, pfn_to_page(PFN_DOWN(info->buf)),
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info->len, offset_in_page(info->buf));
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sg_dma_address(&sg) = info->buf;
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desc = chan->device->device_prep_slave_sg(chan,
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&sg, 1, info->direction, DMA_PREP_INTERRUPT);
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break;
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case DMA_CYCLIC:
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desc = chan->device->device_prep_dma_cyclic(chan,
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info->buf, info->len, info->period, info->direction);
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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 = info->fp;
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desc->callback_param = info->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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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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.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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