mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
f5e84eae79
For better maintenance split OF helpers to the separate module. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190820131546.75744-11-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Platform driver for the Synopsys DesignWare DMA Controller
|
|
*
|
|
* Copyright (C) 2007-2008 Atmel Corporation
|
|
* Copyright (C) 2010-2011 ST Microelectronics
|
|
* Copyright (C) 2013 Intel Corporation
|
|
*/
|
|
|
|
#include <linux/of.h>
|
|
#include <linux/of_dma.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
|
|
struct of_dma *ofdma)
|
|
{
|
|
struct dw_dma *dw = ofdma->of_dma_data;
|
|
struct dw_dma_slave slave = {
|
|
.dma_dev = dw->dma.dev,
|
|
};
|
|
dma_cap_mask_t cap;
|
|
|
|
if (dma_spec->args_count != 3)
|
|
return NULL;
|
|
|
|
slave.src_id = dma_spec->args[0];
|
|
slave.dst_id = dma_spec->args[0];
|
|
slave.m_master = dma_spec->args[1];
|
|
slave.p_master = dma_spec->args[2];
|
|
|
|
if (WARN_ON(slave.src_id >= DW_DMA_MAX_NR_REQUESTS ||
|
|
slave.dst_id >= DW_DMA_MAX_NR_REQUESTS ||
|
|
slave.m_master >= dw->pdata->nr_masters ||
|
|
slave.p_master >= dw->pdata->nr_masters))
|
|
return NULL;
|
|
|
|
dma_cap_zero(cap);
|
|
dma_cap_set(DMA_SLAVE, cap);
|
|
|
|
/* TODO: there should be a simpler way to do this */
|
|
return dma_request_channel(cap, dw_dma_filter, &slave);
|
|
}
|
|
|
|
struct dw_dma_platform_data *dw_dma_parse_dt(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct dw_dma_platform_data *pdata;
|
|
u32 tmp, arr[DW_DMA_MAX_NR_MASTERS], mb[DW_DMA_MAX_NR_CHANNELS];
|
|
u32 nr_masters;
|
|
u32 nr_channels;
|
|
|
|
if (!np) {
|
|
dev_err(&pdev->dev, "Missing DT data\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "dma-masters", &nr_masters))
|
|
return NULL;
|
|
if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
|
|
return NULL;
|
|
|
|
if (of_property_read_u32(np, "dma-channels", &nr_channels))
|
|
return NULL;
|
|
if (nr_channels > DW_DMA_MAX_NR_CHANNELS)
|
|
return NULL;
|
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return NULL;
|
|
|
|
pdata->nr_masters = nr_masters;
|
|
pdata->nr_channels = nr_channels;
|
|
|
|
if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
|
|
pdata->chan_allocation_order = (unsigned char)tmp;
|
|
|
|
if (!of_property_read_u32(np, "chan_priority", &tmp))
|
|
pdata->chan_priority = tmp;
|
|
|
|
if (!of_property_read_u32(np, "block_size", &tmp))
|
|
pdata->block_size = tmp;
|
|
|
|
if (!of_property_read_u32_array(np, "data-width", arr, nr_masters)) {
|
|
for (tmp = 0; tmp < nr_masters; tmp++)
|
|
pdata->data_width[tmp] = arr[tmp];
|
|
} else if (!of_property_read_u32_array(np, "data_width", arr, nr_masters)) {
|
|
for (tmp = 0; tmp < nr_masters; tmp++)
|
|
pdata->data_width[tmp] = BIT(arr[tmp] & 0x07);
|
|
}
|
|
|
|
if (!of_property_read_u32_array(np, "multi-block", mb, nr_channels)) {
|
|
for (tmp = 0; tmp < nr_channels; tmp++)
|
|
pdata->multi_block[tmp] = mb[tmp];
|
|
} else {
|
|
for (tmp = 0; tmp < nr_channels; tmp++)
|
|
pdata->multi_block[tmp] = 1;
|
|
}
|
|
|
|
if (!of_property_read_u32(np, "snps,dma-protection-control", &tmp)) {
|
|
if (tmp > CHAN_PROTCTL_MASK)
|
|
return NULL;
|
|
pdata->protctl = tmp;
|
|
}
|
|
|
|
return pdata;
|
|
}
|
|
|
|
void dw_dma_of_controller_register(struct dw_dma *dw)
|
|
{
|
|
struct device *dev = dw->dma.dev;
|
|
int ret;
|
|
|
|
if (!dev->of_node)
|
|
return;
|
|
|
|
ret = of_dma_controller_register(dev->of_node, dw_dma_of_xlate, dw);
|
|
if (ret)
|
|
dev_err(dev, "could not register of_dma_controller\n");
|
|
}
|
|
|
|
void dw_dma_of_controller_free(struct dw_dma *dw)
|
|
{
|
|
struct device *dev = dw->dma.dev;
|
|
|
|
if (!dev->of_node)
|
|
return;
|
|
|
|
of_dma_controller_free(dev->of_node);
|
|
}
|