forked from Minki/linux
dmaengine: dw: platform: Split OF helpers to separate module
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>
This commit is contained in:
Andy Shevchenko
Vinod Koul
parent
b685fe26e9
commit
f5e84eae79
@ -5,6 +5,7 @@ dw_dmac_core-objs := core.o dw.o idma32.o
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obj-$(CONFIG_DW_DMAC) += dw_dmac.o
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dw_dmac-y := platform.o
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dw_dmac-$(CONFIG_ACPI) += acpi.o
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dw_dmac-$(CONFIG_OF) += of.o
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obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o
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dw_dmac_pci-objs := pci.o
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@ -31,6 +31,21 @@ static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
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static inline void dw_dma_acpi_controller_free(struct dw_dma *dw) {}
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#endif /* !CONFIG_ACPI */
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struct platform_device;
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#ifdef CONFIG_OF
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struct dw_dma_platform_data *dw_dma_parse_dt(struct platform_device *pdev);
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void dw_dma_of_controller_register(struct dw_dma *dw);
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void dw_dma_of_controller_free(struct dw_dma *dw);
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#else
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static inline struct dw_dma_platform_data *dw_dma_parse_dt(struct platform_device *pdev)
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{
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return NULL;
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}
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static inline void dw_dma_of_controller_register(struct dw_dma *dw) {}
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static inline void dw_dma_of_controller_free(struct dw_dma *dw) {}
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#endif
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struct dw_dma_chip_pdata {
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const struct dw_dma_platform_data *pdata;
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int (*probe)(struct dw_dma_chip *chip);
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131
drivers/dma/dw/of.c
Normal file
131
drivers/dma/dw/of.c
Normal file
@ -0,0 +1,131 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Platform driver for the Synopsys DesignWare DMA Controller
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*
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* Copyright (C) 2007-2008 Atmel Corporation
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* Copyright (C) 2010-2011 ST Microelectronics
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* Copyright (C) 2013 Intel Corporation
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*/
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#include <linux/of.h>
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#include <linux/of_dma.h>
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#include <linux/platform_device.h>
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#include "internal.h"
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static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
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struct of_dma *ofdma)
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{
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struct dw_dma *dw = ofdma->of_dma_data;
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struct dw_dma_slave slave = {
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.dma_dev = dw->dma.dev,
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};
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dma_cap_mask_t cap;
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if (dma_spec->args_count != 3)
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return NULL;
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slave.src_id = dma_spec->args[0];
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slave.dst_id = dma_spec->args[0];
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slave.m_master = dma_spec->args[1];
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slave.p_master = dma_spec->args[2];
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if (WARN_ON(slave.src_id >= DW_DMA_MAX_NR_REQUESTS ||
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slave.dst_id >= DW_DMA_MAX_NR_REQUESTS ||
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slave.m_master >= dw->pdata->nr_masters ||
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slave.p_master >= dw->pdata->nr_masters))
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return NULL;
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dma_cap_zero(cap);
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dma_cap_set(DMA_SLAVE, cap);
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/* TODO: there should be a simpler way to do this */
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return dma_request_channel(cap, dw_dma_filter, &slave);
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}
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struct dw_dma_platform_data *dw_dma_parse_dt(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct dw_dma_platform_data *pdata;
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u32 tmp, arr[DW_DMA_MAX_NR_MASTERS], mb[DW_DMA_MAX_NR_CHANNELS];
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u32 nr_masters;
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u32 nr_channels;
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if (!np) {
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dev_err(&pdev->dev, "Missing DT data\n");
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return NULL;
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}
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if (of_property_read_u32(np, "dma-masters", &nr_masters))
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return NULL;
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if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
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return NULL;
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if (of_property_read_u32(np, "dma-channels", &nr_channels))
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return NULL;
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if (nr_channels > DW_DMA_MAX_NR_CHANNELS)
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return NULL;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return NULL;
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pdata->nr_masters = nr_masters;
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pdata->nr_channels = nr_channels;
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if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
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pdata->chan_allocation_order = (unsigned char)tmp;
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if (!of_property_read_u32(np, "chan_priority", &tmp))
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pdata->chan_priority = tmp;
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if (!of_property_read_u32(np, "block_size", &tmp))
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pdata->block_size = tmp;
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if (!of_property_read_u32_array(np, "data-width", arr, nr_masters)) {
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for (tmp = 0; tmp < nr_masters; tmp++)
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pdata->data_width[tmp] = arr[tmp];
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} else if (!of_property_read_u32_array(np, "data_width", arr, nr_masters)) {
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for (tmp = 0; tmp < nr_masters; tmp++)
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pdata->data_width[tmp] = BIT(arr[tmp] & 0x07);
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}
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if (!of_property_read_u32_array(np, "multi-block", mb, nr_channels)) {
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for (tmp = 0; tmp < nr_channels; tmp++)
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pdata->multi_block[tmp] = mb[tmp];
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} else {
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for (tmp = 0; tmp < nr_channels; tmp++)
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pdata->multi_block[tmp] = 1;
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}
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if (!of_property_read_u32(np, "snps,dma-protection-control", &tmp)) {
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if (tmp > CHAN_PROTCTL_MASK)
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return NULL;
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pdata->protctl = tmp;
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}
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return pdata;
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}
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void dw_dma_of_controller_register(struct dw_dma *dw)
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{
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struct device *dev = dw->dma.dev;
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int ret;
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if (!dev->of_node)
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return;
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ret = of_dma_controller_register(dev->of_node, dw_dma_of_xlate, dw);
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if (ret)
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dev_err(dev, "could not register of_dma_controller\n");
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}
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void dw_dma_of_controller_free(struct dw_dma *dw)
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{
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struct device *dev = dw->dma.dev;
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if (!dev->of_node)
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return;
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of_dma_controller_free(dev->of_node);
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}
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@ -17,116 +17,12 @@
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/of.h>
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#include <linux/of_dma.h>
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#include <linux/acpi.h>
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#include "internal.h"
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#define DRV_NAME "dw_dmac"
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static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
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struct of_dma *ofdma)
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{
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struct dw_dma *dw = ofdma->of_dma_data;
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struct dw_dma_slave slave = {
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.dma_dev = dw->dma.dev,
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};
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dma_cap_mask_t cap;
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if (dma_spec->args_count != 3)
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return NULL;
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slave.src_id = dma_spec->args[0];
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slave.dst_id = dma_spec->args[0];
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slave.m_master = dma_spec->args[1];
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slave.p_master = dma_spec->args[2];
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if (WARN_ON(slave.src_id >= DW_DMA_MAX_NR_REQUESTS ||
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slave.dst_id >= DW_DMA_MAX_NR_REQUESTS ||
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slave.m_master >= dw->pdata->nr_masters ||
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slave.p_master >= dw->pdata->nr_masters))
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return NULL;
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dma_cap_zero(cap);
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dma_cap_set(DMA_SLAVE, cap);
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/* TODO: there should be a simpler way to do this */
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return dma_request_channel(cap, dw_dma_filter, &slave);
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}
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#ifdef CONFIG_OF
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static struct dw_dma_platform_data *
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dw_dma_parse_dt(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct dw_dma_platform_data *pdata;
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u32 tmp, arr[DW_DMA_MAX_NR_MASTERS], mb[DW_DMA_MAX_NR_CHANNELS];
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u32 nr_masters;
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u32 nr_channels;
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if (!np) {
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dev_err(&pdev->dev, "Missing DT data\n");
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return NULL;
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}
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if (of_property_read_u32(np, "dma-masters", &nr_masters))
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return NULL;
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if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
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return NULL;
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if (of_property_read_u32(np, "dma-channels", &nr_channels))
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return NULL;
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if (nr_channels > DW_DMA_MAX_NR_CHANNELS)
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return NULL;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return NULL;
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pdata->nr_masters = nr_masters;
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pdata->nr_channels = nr_channels;
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if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
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pdata->chan_allocation_order = (unsigned char)tmp;
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if (!of_property_read_u32(np, "chan_priority", &tmp))
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pdata->chan_priority = tmp;
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if (!of_property_read_u32(np, "block_size", &tmp))
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pdata->block_size = tmp;
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if (!of_property_read_u32_array(np, "data-width", arr, nr_masters)) {
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for (tmp = 0; tmp < nr_masters; tmp++)
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pdata->data_width[tmp] = arr[tmp];
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} else if (!of_property_read_u32_array(np, "data_width", arr, nr_masters)) {
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for (tmp = 0; tmp < nr_masters; tmp++)
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pdata->data_width[tmp] = BIT(arr[tmp] & 0x07);
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}
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if (!of_property_read_u32_array(np, "multi-block", mb, nr_channels)) {
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for (tmp = 0; tmp < nr_channels; tmp++)
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pdata->multi_block[tmp] = mb[tmp];
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} else {
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for (tmp = 0; tmp < nr_channels; tmp++)
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pdata->multi_block[tmp] = 1;
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}
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if (!of_property_read_u32(np, "snps,dma-protection-control", &tmp)) {
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if (tmp > CHAN_PROTCTL_MASK)
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return NULL;
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pdata->protctl = tmp;
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}
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return pdata;
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}
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#else
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static inline struct dw_dma_platform_data *
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dw_dma_parse_dt(struct platform_device *pdev)
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{
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return NULL;
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}
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#endif
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static int dw_probe(struct platform_device *pdev)
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{
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const struct dw_dma_chip_pdata *match;
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@ -185,13 +81,7 @@ static int dw_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, data);
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if (pdev->dev.of_node) {
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err = of_dma_controller_register(pdev->dev.of_node,
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dw_dma_of_xlate, chip->dw);
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if (err)
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dev_err(&pdev->dev,
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"could not register of_dma_controller\n");
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}
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dw_dma_of_controller_register(chip->dw);
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dw_dma_acpi_controller_register(chip->dw);
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@ -211,8 +101,7 @@ static int dw_remove(struct platform_device *pdev)
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dw_dma_acpi_controller_free(chip->dw);
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if (pdev->dev.of_node)
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of_dma_controller_free(pdev->dev.of_node);
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dw_dma_of_controller_free(chip->dw);
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ret = data->remove(chip);
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if (ret)
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