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![Axel Lin](/assets/img/avatar_default.png)
devm_ioremap_resource returns ERR_PTR on failure. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
209 lines
5.2 KiB
C
209 lines
5.2 KiB
C
/*
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* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
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* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
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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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*/
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/io.h>
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#include <linux/idr.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/of_dma.h>
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#define TI_XBAR_OUTPUTS 127
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#define TI_XBAR_INPUTS 256
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#define TI_XBAR_EDMA_OFFSET 0
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#define TI_XBAR_SDMA_OFFSET 1
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struct ti_dma_xbar_data {
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void __iomem *iomem;
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struct dma_router dmarouter;
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struct idr map_idr;
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u16 safe_val; /* Value to rest the crossbar lines */
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u32 xbar_requests; /* number of DMA requests connected to XBAR */
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u32 dma_requests; /* number of DMA requests forwarded to DMA */
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u32 dma_offset;
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};
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struct ti_dma_xbar_map {
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u16 xbar_in;
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int xbar_out;
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};
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static inline void ti_dma_xbar_write(void __iomem *iomem, int xbar, u16 val)
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{
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writew_relaxed(val, iomem + (xbar * 2));
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}
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static void ti_dma_xbar_free(struct device *dev, void *route_data)
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{
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struct ti_dma_xbar_data *xbar = dev_get_drvdata(dev);
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struct ti_dma_xbar_map *map = route_data;
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dev_dbg(dev, "Unmapping XBAR%u (was routed to %d)\n",
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map->xbar_in, map->xbar_out);
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ti_dma_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
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idr_remove(&xbar->map_idr, map->xbar_out);
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kfree(map);
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}
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static void *ti_dma_xbar_route_allocate(struct of_phandle_args *dma_spec,
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struct of_dma *ofdma)
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{
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struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
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struct ti_dma_xbar_data *xbar = platform_get_drvdata(pdev);
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struct ti_dma_xbar_map *map;
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if (dma_spec->args[0] >= xbar->xbar_requests) {
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dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
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dma_spec->args[0]);
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return ERR_PTR(-EINVAL);
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}
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/* The of_node_put() will be done in the core for the node */
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dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
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if (!dma_spec->np) {
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dev_err(&pdev->dev, "Can't get DMA master\n");
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return ERR_PTR(-EINVAL);
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}
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map = kzalloc(sizeof(*map), GFP_KERNEL);
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if (!map) {
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of_node_put(dma_spec->np);
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return ERR_PTR(-ENOMEM);
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}
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map->xbar_out = idr_alloc(&xbar->map_idr, NULL, 0, xbar->dma_requests,
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GFP_KERNEL);
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map->xbar_in = (u16)dma_spec->args[0];
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dma_spec->args[0] = map->xbar_out + xbar->dma_offset;
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dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
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map->xbar_in, map->xbar_out);
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ti_dma_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
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return map;
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}
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static const struct of_device_id ti_dma_master_match[] = {
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{
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.compatible = "ti,omap4430-sdma",
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.data = (void *)TI_XBAR_SDMA_OFFSET,
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},
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{
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.compatible = "ti,edma3",
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.data = (void *)TI_XBAR_EDMA_OFFSET,
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},
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{},
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};
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static int ti_dma_xbar_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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const struct of_device_id *match;
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struct device_node *dma_node;
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struct ti_dma_xbar_data *xbar;
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struct resource *res;
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u32 safe_val;
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void __iomem *iomem;
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int i, ret;
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if (!node)
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return -ENODEV;
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xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
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if (!xbar)
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return -ENOMEM;
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idr_init(&xbar->map_idr);
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dma_node = of_parse_phandle(node, "dma-masters", 0);
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if (!dma_node) {
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dev_err(&pdev->dev, "Can't get DMA master node\n");
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return -ENODEV;
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}
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match = of_match_node(ti_dma_master_match, dma_node);
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if (!match) {
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dev_err(&pdev->dev, "DMA master is not supported\n");
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return -EINVAL;
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}
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if (of_property_read_u32(dma_node, "dma-requests",
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&xbar->dma_requests)) {
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dev_info(&pdev->dev,
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"Missing XBAR output information, using %u.\n",
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TI_XBAR_OUTPUTS);
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xbar->dma_requests = TI_XBAR_OUTPUTS;
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}
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of_node_put(dma_node);
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if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) {
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dev_info(&pdev->dev,
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"Missing XBAR input information, using %u.\n",
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TI_XBAR_INPUTS);
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xbar->xbar_requests = TI_XBAR_INPUTS;
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}
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if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val))
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xbar->safe_val = (u16)safe_val;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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iomem = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(iomem))
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return PTR_ERR(iomem);
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xbar->iomem = iomem;
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xbar->dmarouter.dev = &pdev->dev;
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xbar->dmarouter.route_free = ti_dma_xbar_free;
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xbar->dma_offset = (u32)match->data;
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platform_set_drvdata(pdev, xbar);
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/* Reset the crossbar */
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for (i = 0; i < xbar->dma_requests; i++)
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ti_dma_xbar_write(xbar->iomem, i, xbar->safe_val);
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ret = of_dma_router_register(node, ti_dma_xbar_route_allocate,
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&xbar->dmarouter);
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if (ret) {
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/* Restore the defaults for the crossbar */
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for (i = 0; i < xbar->dma_requests; i++)
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ti_dma_xbar_write(xbar->iomem, i, i);
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}
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return ret;
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}
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static const struct of_device_id ti_dma_xbar_match[] = {
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{ .compatible = "ti,dra7-dma-crossbar" },
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{},
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};
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static struct platform_driver ti_dma_xbar_driver = {
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.driver = {
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.name = "ti-dma-crossbar",
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.of_match_table = of_match_ptr(ti_dma_xbar_match),
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},
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.probe = ti_dma_xbar_probe,
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};
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int omap_dmaxbar_init(void)
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{
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return platform_driver_register(&ti_dma_xbar_driver);
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}
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arch_initcall(omap_dmaxbar_init);
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