mirror of https://gitee.com/openkylin/linux.git
220 lines
5.1 KiB
C
220 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Platform driver for the Synopsys DesignWare DMA Controller
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*
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* Copyright (C) 2007-2008 Atmel Corporation
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* Copyright (C) 2010-2011 ST Microelectronics
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* Copyright (C) 2013 Intel Corporation
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*
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* Some parts of this driver are derived from the original dw_dmac.
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/clk.h>
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#include <linux/pm_runtime.h>
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#include <linux/platform_device.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/of.h>
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#include <linux/acpi.h>
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#include "internal.h"
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#define DRV_NAME "dw_dmac"
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static int dw_probe(struct platform_device *pdev)
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{
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const struct dw_dma_chip_pdata *match;
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struct dw_dma_chip_pdata *data;
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struct dw_dma_chip *chip;
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struct device *dev = &pdev->dev;
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int err;
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match = device_get_match_data(dev);
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if (!match)
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return -ENODEV;
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data = devm_kmemdup(&pdev->dev, match, sizeof(*match), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->irq = platform_get_irq(pdev, 0);
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if (chip->irq < 0)
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return chip->irq;
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chip->regs = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(chip->regs))
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return PTR_ERR(chip->regs);
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err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
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if (err)
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return err;
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if (!data->pdata)
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data->pdata = dev_get_platdata(dev);
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if (!data->pdata)
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data->pdata = dw_dma_parse_dt(pdev);
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chip->dev = dev;
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chip->id = pdev->id;
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chip->pdata = data->pdata;
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data->chip = chip;
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chip->clk = devm_clk_get_optional(chip->dev, "hclk");
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if (IS_ERR(chip->clk))
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return PTR_ERR(chip->clk);
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err = clk_prepare_enable(chip->clk);
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if (err)
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return err;
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pm_runtime_enable(&pdev->dev);
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err = data->probe(chip);
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if (err)
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goto err_dw_dma_probe;
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platform_set_drvdata(pdev, data);
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dw_dma_of_controller_register(chip->dw);
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dw_dma_acpi_controller_register(chip->dw);
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return 0;
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err_dw_dma_probe:
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pm_runtime_disable(&pdev->dev);
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clk_disable_unprepare(chip->clk);
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return err;
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}
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static int dw_remove(struct platform_device *pdev)
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{
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struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev);
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struct dw_dma_chip *chip = data->chip;
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int ret;
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dw_dma_acpi_controller_free(chip->dw);
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dw_dma_of_controller_free(chip->dw);
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ret = data->remove(chip);
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if (ret)
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dev_warn(chip->dev, "can't remove device properly: %d\n", ret);
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pm_runtime_disable(&pdev->dev);
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clk_disable_unprepare(chip->clk);
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return 0;
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}
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static void dw_shutdown(struct platform_device *pdev)
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{
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struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev);
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struct dw_dma_chip *chip = data->chip;
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/*
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* We have to call do_dw_dma_disable() to stop any ongoing transfer. On
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* some platforms we can't do that since DMA device is powered off.
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* Moreover we have no possibility to check if the platform is affected
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* or not. That's why we call pm_runtime_get_sync() / pm_runtime_put()
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* unconditionally. On the other hand we can't use
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* pm_runtime_suspended() because runtime PM framework is not fully
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* used by the driver.
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*/
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pm_runtime_get_sync(chip->dev);
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do_dw_dma_disable(chip);
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pm_runtime_put_sync_suspend(chip->dev);
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clk_disable_unprepare(chip->clk);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id dw_dma_of_id_table[] = {
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{ .compatible = "snps,dma-spear1340", .data = &dw_dma_chip_pdata },
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{}
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};
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MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
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#endif
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id dw_dma_acpi_id_table[] = {
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{ "INTL9C60", (kernel_ulong_t)&dw_dma_chip_pdata },
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{ "80862286", (kernel_ulong_t)&dw_dma_chip_pdata },
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{ "808622C0", (kernel_ulong_t)&dw_dma_chip_pdata },
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/* Elkhart Lake iDMA 32-bit (PSE DMA) */
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{ "80864BB4", (kernel_ulong_t)&idma32_chip_pdata },
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{ "80864BB5", (kernel_ulong_t)&idma32_chip_pdata },
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{ "80864BB6", (kernel_ulong_t)&idma32_chip_pdata },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table);
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#endif
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#ifdef CONFIG_PM_SLEEP
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static int dw_suspend_late(struct device *dev)
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{
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struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);
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struct dw_dma_chip *chip = data->chip;
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do_dw_dma_disable(chip);
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clk_disable_unprepare(chip->clk);
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return 0;
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}
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static int dw_resume_early(struct device *dev)
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{
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struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);
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struct dw_dma_chip *chip = data->chip;
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int ret;
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ret = clk_prepare_enable(chip->clk);
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if (ret)
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return ret;
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return do_dw_dma_enable(chip);
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}
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#endif /* CONFIG_PM_SLEEP */
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static const struct dev_pm_ops dw_dev_pm_ops = {
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SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_suspend_late, dw_resume_early)
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};
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static struct platform_driver dw_driver = {
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.probe = dw_probe,
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.remove = dw_remove,
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.shutdown = dw_shutdown,
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.driver = {
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.name = DRV_NAME,
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.pm = &dw_dev_pm_ops,
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.of_match_table = of_match_ptr(dw_dma_of_id_table),
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.acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
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},
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};
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static int __init dw_init(void)
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{
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return platform_driver_register(&dw_driver);
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}
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subsys_initcall(dw_init);
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static void __exit dw_exit(void)
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{
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platform_driver_unregister(&dw_driver);
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}
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module_exit(dw_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");
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MODULE_ALIAS("platform:" DRV_NAME);
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