dw_dmac: add ACPI support
Since we have proper ACPI DMA helpers implemented, the driver may use it. This patch introduces custom filter function together with acpi_device_id table. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>hifive-unleashed-5.1
Andy Shevchenko
Vinod Koul
parent
4e82f5ddd1
commit
42c91ee71d
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@ -25,6 +25,8 @@
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/acpi_dma.h>
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#include "dw_dmac_regs.h"
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#include "dmaengine.h"
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@ -983,13 +985,6 @@ static inline void convert_burst(u32 *maxburst)
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*maxburst = 0;
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}
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static inline void convert_slave_id(struct dw_dma_chan *dwc)
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{
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struct dw_dma *dw = to_dw_dma(dwc->chan.device);
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dwc->dma_sconfig.slave_id -= dw->request_line_base;
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}
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static int
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set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
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{
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@ -1008,7 +1003,6 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
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convert_burst(&dwc->dma_sconfig.src_maxburst);
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convert_burst(&dwc->dma_sconfig.dst_maxburst);
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convert_slave_id(dwc);
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return 0;
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}
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@ -1284,6 +1278,46 @@ static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
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return dma_request_channel(cap, dw_dma_of_filter, &fargs);
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}
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#ifdef CONFIG_ACPI
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static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
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{
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struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
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struct acpi_dma_spec *dma_spec = param;
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if (chan->device->dev != dma_spec->dev ||
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chan->chan_id != dma_spec->chan_id)
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return false;
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dwc->request_line = dma_spec->slave_id;
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dwc->src_master = dwc_get_sms(NULL);
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dwc->dst_master = dwc_get_dms(NULL);
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return true;
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}
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static void dw_dma_acpi_controller_register(struct dw_dma *dw)
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{
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struct device *dev = dw->dma.dev;
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struct acpi_dma_filter_info *info;
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int ret;
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info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return;
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dma_cap_zero(info->dma_cap);
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dma_cap_set(DMA_SLAVE, info->dma_cap);
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info->filter_fn = dw_dma_acpi_filter;
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ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
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info);
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if (ret)
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dev_err(dev, "could not register acpi_dma_controller\n");
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}
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#else /* !CONFIG_ACPI */
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static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
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#endif /* !CONFIG_ACPI */
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/* --------------------- Cyclic DMA API extensions -------------------- */
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/**
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@ -1620,7 +1654,6 @@ dw_dma_parse_dt(struct platform_device *pdev)
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static int dw_probe(struct platform_device *pdev)
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{
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const struct platform_device_id *match;
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struct dw_dma_platform_data *pdata;
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struct resource *io;
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struct dw_dma *dw;
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@ -1704,11 +1737,6 @@ static int dw_probe(struct platform_device *pdev)
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memcpy(dw->data_width, pdata->data_width, 4);
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}
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/* Get the base request line if set */
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match = platform_get_device_id(pdev);
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if (match)
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dw->request_line_base = (unsigned int)match->driver_data;
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/* Calculate all channel mask before DMA setup */
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dw->all_chan_mask = (1 << nr_channels) - 1;
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@ -1833,6 +1861,9 @@ static int dw_probe(struct platform_device *pdev)
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"could not register of_dma_controller\n");
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}
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if (ACPI_HANDLE(&pdev->dev))
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dw_dma_acpi_controller_register(dw);
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return 0;
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}
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@ -1904,11 +1935,12 @@ static const struct of_device_id dw_dma_of_id_table[] = {
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MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
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#endif
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static const struct platform_device_id dw_dma_ids[] = {
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/* Name, Request Line Base */
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{ "INTL9C60", (kernel_ulong_t)16 },
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id dw_dma_acpi_id_table[] = {
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{ "INTL9C60", 0 },
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{ }
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};
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#endif
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static struct platform_driver dw_driver = {
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.probe = dw_probe,
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@ -1918,8 +1950,8 @@ static struct platform_driver dw_driver = {
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.name = "dw_dmac",
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.pm = &dw_dev_pm_ops,
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.of_match_table = of_match_ptr(dw_dma_of_id_table),
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.acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
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},
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.id_table = dw_dma_ids,
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};
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static int __init dw_init(void)
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@ -250,7 +250,6 @@ struct dw_dma {
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/* hardware configuration */
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unsigned char nr_masters;
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unsigned char data_width[4];
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unsigned int request_line_base;
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struct dw_dma_chan chan[0];
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};
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