1 // SPDX-License-Identifier: GPL-2.0
3  * Platform driver for the Synopsys DesignWare DMA Controller
5  * Copyright (C) 2007-2008 Atmel Corporation
6  * Copyright (C) 2010-2011 ST Microelectronics
18 #include <linux/dma-mapping.h>
31 	struct device *dev = &pdev->dev;  in dw_probe()
36 		return -ENODEV;  in dw_probe()
38 	data = devm_kmemdup(&pdev->dev, match, sizeof(*match), GFP_KERNEL);  in dw_probe()
40 		return -ENOMEM;  in dw_probe()
44 		return -ENOMEM;  in dw_probe()
46 	chip->irq = platform_get_irq(pdev, 0);  in dw_probe()
47 	if (chip->irq < 0)  in dw_probe()
48 		return chip->irq;  in dw_probe()
50 	chip->regs = devm_platform_ioremap_resource(pdev, 0);  in dw_probe()
51 	if (IS_ERR(chip->regs))  in dw_probe()
52 		return PTR_ERR(chip->regs);  in dw_probe()
54 	ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));  in dw_probe()
58 	if (!data->pdata)  in dw_probe()
59 		data->pdata = dev_get_platdata(dev);  in dw_probe()
60 	if (!data->pdata)  in dw_probe()
61 		data->pdata = dw_dma_parse_dt(pdev);  in dw_probe()
63 	chip->dev = dev;  in dw_probe()
64 	chip->id = pdev->id;  in dw_probe()
65 	chip->pdata = data->pdata;  in dw_probe()
67 	data->chip = chip;  in dw_probe()
69 	chip->clk = devm_clk_get_optional(chip->dev, "hclk");  in dw_probe()
70 	if (IS_ERR(chip->clk))  in dw_probe()
71 		return PTR_ERR(chip->clk);  in dw_probe()
72 	ret = clk_prepare_enable(chip->clk);  in dw_probe()
76 	pm_runtime_enable(&pdev->dev);  in dw_probe()
78 	ret = data->probe(chip);  in dw_probe()
84 	dw_dma_of_controller_register(chip->dw);  in dw_probe()
86 	dw_dma_acpi_controller_register(chip->dw);  in dw_probe()
91 	pm_runtime_disable(&pdev->dev);  in dw_probe()
92 	clk_disable_unprepare(chip->clk);  in dw_probe()
99 	struct dw_dma_chip *chip = data->chip;  in dw_remove()
102 	dw_dma_acpi_controller_free(chip->dw);  in dw_remove()
104 	dw_dma_of_controller_free(chip->dw);  in dw_remove()
106 	ret = data->remove(chip);  in dw_remove()
108 		dev_warn(chip->dev, "can't remove device properly: %d\n", ret);  in dw_remove()
110 	pm_runtime_disable(&pdev->dev);  in dw_remove()
111 	clk_disable_unprepare(chip->clk);  in dw_remove()
117 	struct dw_dma_chip *chip = data->chip;  in dw_shutdown()
121 	 * some platforms we can't do that since DMA device is powered off.  in dw_shutdown()
128 	pm_runtime_get_sync(chip->dev);  in dw_shutdown()
130 	pm_runtime_put_sync_suspend(chip->dev);  in dw_shutdown()
132 	clk_disable_unprepare(chip->clk);  in dw_shutdown()
137 	{ .compatible = "snps,dma-spear1340", .data = &dw_dma_chip_pdata },
138 	{ .compatible = "renesas,rzn1-dma", .data = &dw_dma_chip_pdata },
150 	/* Elkhart Lake iDMA 32-bit (PSE DMA) */
165 	struct dw_dma_chip *chip = data->chip;  in dw_suspend_late()
168 	clk_disable_unprepare(chip->clk);  in dw_suspend_late()
176 	struct dw_dma_chip *chip = data->chip;  in dw_resume_early()
179 	ret = clk_prepare_enable(chip->clk);  in dw_resume_early()
217 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");