134d9c52fc
The Renesas RZN1 DMA IP is based on a DW core, with eg. an additional dmamux register located in the system control area which can take up to 32 requests (16 per DMA controller). Each DMA channel can be wired to two different peripherals. We need two additional information from the 'dmas' property: the channel (bit in the dmamux register) that must be accessed and the value of the mux for this channel. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220427095653.91804-6-miquel.raynal@bootlin.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
155 lines
4 KiB
C
155 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022 Schneider-Electric
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* Author: Miquel Raynal <miquel.raynal@bootlin.com
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* Based on TI crossbar driver written by Peter Ujfalusi <peter.ujfalusi@ti.com>
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*/
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#include <linux/bitops.h>
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#include <linux/of_device.h>
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#include <linux/of_dma.h>
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#include <linux/slab.h>
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#include <linux/soc/renesas/r9a06g032-sysctrl.h>
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#include <linux/types.h>
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#define RNZ1_DMAMUX_NCELLS 6
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#define RZN1_DMAMUX_MAX_LINES 64
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#define RZN1_DMAMUX_LINES_PER_CTLR 16
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struct rzn1_dmamux_data {
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struct dma_router dmarouter;
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DECLARE_BITMAP(used_chans, 2 * RZN1_DMAMUX_LINES_PER_CTLR);
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};
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struct rzn1_dmamux_map {
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unsigned int req_idx;
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};
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static void rzn1_dmamux_free(struct device *dev, void *route_data)
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{
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struct rzn1_dmamux_data *dmamux = dev_get_drvdata(dev);
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struct rzn1_dmamux_map *map = route_data;
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dev_dbg(dev, "Unmapping DMAMUX request %u\n", map->req_idx);
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clear_bit(map->req_idx, dmamux->used_chans);
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kfree(map);
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}
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static void *rzn1_dmamux_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 rzn1_dmamux_data *dmamux = platform_get_drvdata(pdev);
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struct rzn1_dmamux_map *map;
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unsigned int dmac_idx, chan, val;
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u32 mask;
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int ret;
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if (dma_spec->args_count != RNZ1_DMAMUX_NCELLS)
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return ERR_PTR(-EINVAL);
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map = kzalloc(sizeof(*map), GFP_KERNEL);
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if (!map)
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return ERR_PTR(-ENOMEM);
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chan = dma_spec->args[0];
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map->req_idx = dma_spec->args[4];
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val = dma_spec->args[5];
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dma_spec->args_count -= 2;
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if (chan >= RZN1_DMAMUX_LINES_PER_CTLR) {
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dev_err(&pdev->dev, "Invalid DMA request line: %u\n", chan);
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ret = -EINVAL;
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goto free_map;
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}
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if (map->req_idx >= RZN1_DMAMUX_MAX_LINES ||
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(map->req_idx % RZN1_DMAMUX_LINES_PER_CTLR) != chan) {
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dev_err(&pdev->dev, "Invalid MUX request line: %u\n", map->req_idx);
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ret = -EINVAL;
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goto free_map;
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}
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dmac_idx = map->req_idx >= RZN1_DMAMUX_LINES_PER_CTLR ? 1 : 0;
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dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", dmac_idx);
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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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ret = -EINVAL;
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goto free_map;
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}
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dev_dbg(&pdev->dev, "Mapping DMAMUX request %u to DMAC%u request %u\n",
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map->req_idx, dmac_idx, chan);
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if (test_and_set_bit(map->req_idx, dmamux->used_chans)) {
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ret = -EBUSY;
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goto free_map;
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}
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mask = BIT(map->req_idx);
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ret = r9a06g032_sysctrl_set_dmamux(mask, val ? mask : 0);
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if (ret)
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goto clear_bitmap;
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return map;
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clear_bitmap:
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clear_bit(map->req_idx, dmamux->used_chans);
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free_map:
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kfree(map);
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return ERR_PTR(ret);
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}
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static const struct of_device_id rzn1_dmac_match[] = {
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{ .compatible = "renesas,rzn1-dma" },
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{}
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};
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static int rzn1_dmamux_probe(struct platform_device *pdev)
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{
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struct device_node *mux_node = pdev->dev.of_node;
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const struct of_device_id *match;
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struct device_node *dmac_node;
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struct rzn1_dmamux_data *dmamux;
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dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL);
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if (!dmamux)
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return -ENOMEM;
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dmac_node = of_parse_phandle(mux_node, "dma-masters", 0);
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if (!dmac_node)
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return dev_err_probe(&pdev->dev, -ENODEV, "Can't get DMA master node\n");
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match = of_match_node(rzn1_dmac_match, dmac_node);
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of_node_put(dmac_node);
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if (!match)
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return dev_err_probe(&pdev->dev, -EINVAL, "DMA master is not supported\n");
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dmamux->dmarouter.dev = &pdev->dev;
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dmamux->dmarouter.route_free = rzn1_dmamux_free;
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platform_set_drvdata(pdev, dmamux);
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return of_dma_router_register(mux_node, rzn1_dmamux_route_allocate,
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&dmamux->dmarouter);
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}
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static const struct of_device_id rzn1_dmamux_match[] = {
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{ .compatible = "renesas,rzn1-dmamux" },
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{}
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};
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static struct platform_driver rzn1_dmamux_driver = {
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.driver = {
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.name = "renesas,rzn1-dmamux",
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.of_match_table = rzn1_dmamux_match,
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},
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.probe = rzn1_dmamux_probe,
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};
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module_platform_driver(rzn1_dmamux_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com");
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MODULE_DESCRIPTION("Renesas RZ/N1 DMAMUX driver");
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