1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Platform driver for the Synopsys DesignWare DMA Controller 4 * 5 * Copyright (C) 2007-2008 Atmel Corporation 6 * Copyright (C) 2010-2011 ST Microelectronics 7 * Copyright (C) 2013 Intel Corporation 8 * 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 26 static 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 err; 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 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 55 if (err) 56 return err; 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 err = clk_prepare_enable(chip->clk); 73 if (err) 74 return err; 75 76 pm_runtime_enable(&pdev->dev); 77 78 err = data->probe(chip); 79 if (err) 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 90 err_dw_dma_probe: 91 pm_runtime_disable(&pdev->dev); 92 clk_disable_unprepare(chip->clk); 93 return err; 94 } 95 96 static int 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 return 0; 114 } 115 116 static void dw_shutdown(struct platform_device *pdev) 117 { 118 struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev); 119 struct dw_dma_chip *chip = data->chip; 120 121 /* 122 * We have to call do_dw_dma_disable() to stop any ongoing transfer. On 123 * some platforms we can't do that since DMA device is powered off. 124 * Moreover we have no possibility to check if the platform is affected 125 * or not. That's why we call pm_runtime_get_sync() / pm_runtime_put() 126 * unconditionally. On the other hand we can't use 127 * pm_runtime_suspended() because runtime PM framework is not fully 128 * used by the driver. 129 */ 130 pm_runtime_get_sync(chip->dev); 131 do_dw_dma_disable(chip); 132 pm_runtime_put_sync_suspend(chip->dev); 133 134 clk_disable_unprepare(chip->clk); 135 } 136 137 #ifdef CONFIG_OF 138 static const struct of_device_id dw_dma_of_id_table[] = { 139 { .compatible = "snps,dma-spear1340", .data = &dw_dma_chip_pdata }, 140 {} 141 }; 142 MODULE_DEVICE_TABLE(of, dw_dma_of_id_table); 143 #endif 144 145 #ifdef CONFIG_ACPI 146 static const struct acpi_device_id dw_dma_acpi_id_table[] = { 147 { "INTL9C60", (kernel_ulong_t)&dw_dma_chip_pdata }, 148 { "80862286", (kernel_ulong_t)&dw_dma_chip_pdata }, 149 { "808622C0", (kernel_ulong_t)&dw_dma_chip_pdata }, 150 151 /* Elkhart Lake iDMA 32-bit (PSE DMA) */ 152 { "80864BB4", (kernel_ulong_t)&xbar_chip_pdata }, 153 { "80864BB5", (kernel_ulong_t)&xbar_chip_pdata }, 154 { "80864BB6", (kernel_ulong_t)&xbar_chip_pdata }, 155 156 { } 157 }; 158 MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table); 159 #endif 160 161 #ifdef CONFIG_PM_SLEEP 162 163 static int dw_suspend_late(struct device *dev) 164 { 165 struct dw_dma_chip_pdata *data = dev_get_drvdata(dev); 166 struct dw_dma_chip *chip = data->chip; 167 168 do_dw_dma_disable(chip); 169 clk_disable_unprepare(chip->clk); 170 171 return 0; 172 } 173 174 static int dw_resume_early(struct device *dev) 175 { 176 struct dw_dma_chip_pdata *data = dev_get_drvdata(dev); 177 struct dw_dma_chip *chip = data->chip; 178 int ret; 179 180 ret = clk_prepare_enable(chip->clk); 181 if (ret) 182 return ret; 183 184 return do_dw_dma_enable(chip); 185 } 186 187 #endif /* CONFIG_PM_SLEEP */ 188 189 static const struct dev_pm_ops dw_dev_pm_ops = { 190 SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_suspend_late, dw_resume_early) 191 }; 192 193 static struct platform_driver dw_driver = { 194 .probe = dw_probe, 195 .remove = dw_remove, 196 .shutdown = dw_shutdown, 197 .driver = { 198 .name = DRV_NAME, 199 .pm = &dw_dev_pm_ops, 200 .of_match_table = of_match_ptr(dw_dma_of_id_table), 201 .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table), 202 }, 203 }; 204 205 static int __init dw_init(void) 206 { 207 return platform_driver_register(&dw_driver); 208 } 209 subsys_initcall(dw_init); 210 211 static void __exit dw_exit(void) 212 { 213 platform_driver_unregister(&dw_driver); 214 } 215 module_exit(dw_exit); 216 217 MODULE_LICENSE("GPL v2"); 218 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver"); 219 MODULE_ALIAS("platform:" DRV_NAME); 220