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1// SPDX-License-Identifier: GPL-2.02/*3 * Platform driver for the Synopsys DesignWare DMA Controller4 *5 * Copyright (C) 2007-2008 Atmel Corporation6 * Copyright (C) 2010-2011 ST Microelectronics7 * Copyright (C) 2013 Intel Corporation8 *9 * Some parts of this driver are derived from the original dw_dmac.10 */11 12#include <linux/module.h>13#include <linux/device.h>14#include <linux/clk.h>15#include <linux/pm_runtime.h>16#include <linux/platform_device.h>17#include <linux/dmaengine.h>18#include <linux/dma-mapping.h>19#include <linux/of.h>20#include <linux/acpi.h>21 22#include "internal.h"23 24#define DRV_NAME "dw_dmac"25 26static int dw_probe(struct platform_device *pdev)27{28 const struct dw_dma_chip_pdata *match;29 struct dw_dma_chip_pdata *data;30 struct dw_dma_chip *chip;31 struct device *dev = &pdev->dev;32 int ret;33 34 match = device_get_match_data(dev);35 if (!match)36 return -ENODEV;37 38 data = devm_kmemdup(&pdev->dev, match, sizeof(*match), GFP_KERNEL);39 if (!data)40 return -ENOMEM;41 42 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);43 if (!chip)44 return -ENOMEM;45 46 chip->irq = platform_get_irq(pdev, 0);47 if (chip->irq < 0)48 return chip->irq;49 50 chip->regs = devm_platform_ioremap_resource(pdev, 0);51 if (IS_ERR(chip->regs))52 return PTR_ERR(chip->regs);53 54 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));55 if (ret)56 return ret;57 58 if (!data->pdata)59 data->pdata = dev_get_platdata(dev);60 if (!data->pdata)61 data->pdata = dw_dma_parse_dt(pdev);62 63 chip->dev = dev;64 chip->id = pdev->id;65 chip->pdata = data->pdata;66 67 data->chip = chip;68 69 chip->clk = devm_clk_get_optional(chip->dev, "hclk");70 if (IS_ERR(chip->clk))71 return PTR_ERR(chip->clk);72 ret = clk_prepare_enable(chip->clk);73 if (ret)74 return ret;75 76 pm_runtime_enable(&pdev->dev);77 78 ret = data->probe(chip);79 if (ret)80 goto err_dw_dma_probe;81 82 platform_set_drvdata(pdev, data);83 84 dw_dma_of_controller_register(chip->dw);85 86 dw_dma_acpi_controller_register(chip->dw);87 88 return 0;89 90err_dw_dma_probe:91 pm_runtime_disable(&pdev->dev);92 clk_disable_unprepare(chip->clk);93 return ret;94}95 96static void dw_remove(struct platform_device *pdev)97{98 struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev);99 struct dw_dma_chip *chip = data->chip;100 int ret;101 102 dw_dma_acpi_controller_free(chip->dw);103 104 dw_dma_of_controller_free(chip->dw);105 106 ret = data->remove(chip);107 if (ret)108 dev_warn(chip->dev, "can't remove device properly: %d\n", ret);109 110 pm_runtime_disable(&pdev->dev);111 clk_disable_unprepare(chip->clk);112}113 114static void dw_shutdown(struct platform_device *pdev)115{116 struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev);117 struct dw_dma_chip *chip = data->chip;118 119 /*120 * We have to call do_dw_dma_disable() to stop any ongoing transfer. On121 * some platforms we can't do that since DMA device is powered off.122 * Moreover we have no possibility to check if the platform is affected123 * or not. That's why we call pm_runtime_get_sync() / pm_runtime_put()124 * unconditionally. On the other hand we can't use125 * pm_runtime_suspended() because runtime PM framework is not fully126 * used by the driver.127 */128 pm_runtime_get_sync(chip->dev);129 do_dw_dma_disable(chip);130 pm_runtime_put_sync_suspend(chip->dev);131 132 clk_disable_unprepare(chip->clk);133}134 135#ifdef CONFIG_OF136static const struct of_device_id dw_dma_of_id_table[] = {137 { .compatible = "snps,dma-spear1340", .data = &dw_dma_chip_pdata },138 { .compatible = "renesas,rzn1-dma", .data = &dw_dma_chip_pdata },139 {}140};141MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);142#endif143 144#ifdef CONFIG_ACPI145static const struct acpi_device_id dw_dma_acpi_id_table[] = {146 { "INTL9C60", (kernel_ulong_t)&dw_dma_chip_pdata },147 { "80862286", (kernel_ulong_t)&dw_dma_chip_pdata },148 { "808622C0", (kernel_ulong_t)&dw_dma_chip_pdata },149 150 /* Elkhart Lake iDMA 32-bit (PSE DMA) */151 { "80864BB4", (kernel_ulong_t)&xbar_chip_pdata },152 { "80864BB5", (kernel_ulong_t)&xbar_chip_pdata },153 { "80864BB6", (kernel_ulong_t)&xbar_chip_pdata },154 155 { }156};157MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table);158#endif159 160#ifdef CONFIG_PM_SLEEP161 162static int dw_suspend_late(struct device *dev)163{164 struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);165 struct dw_dma_chip *chip = data->chip;166 167 do_dw_dma_disable(chip);168 clk_disable_unprepare(chip->clk);169 170 return 0;171}172 173static int dw_resume_early(struct device *dev)174{175 struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);176 struct dw_dma_chip *chip = data->chip;177 int ret;178 179 ret = clk_prepare_enable(chip->clk);180 if (ret)181 return ret;182 183 return do_dw_dma_enable(chip);184}185 186#endif /* CONFIG_PM_SLEEP */187 188static const struct dev_pm_ops dw_dev_pm_ops = {189 SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_suspend_late, dw_resume_early)190};191 192static struct platform_driver dw_driver = {193 .probe = dw_probe,194 .remove_new = dw_remove,195 .shutdown = dw_shutdown,196 .driver = {197 .name = DRV_NAME,198 .pm = &dw_dev_pm_ops,199 .of_match_table = of_match_ptr(dw_dma_of_id_table),200 .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),201 },202};203 204static int __init dw_init(void)205{206 return platform_driver_register(&dw_driver);207}208subsys_initcall(dw_init);209 210static void __exit dw_exit(void)211{212 platform_driver_unregister(&dw_driver);213}214module_exit(dw_exit);215 216MODULE_LICENSE("GPL v2");217MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");218MODULE_ALIAS("platform:" DRV_NAME);219