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366 lines
8.5 KiB
366 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Samsung Exynos USB HOST EHCI Controller |
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* |
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* Copyright (C) 2011 Samsung Electronics Co.Ltd |
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* Author: Jingoo Han <[email protected]> |
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* Author: Joonyoung Shim <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_gpio.h> |
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#include <linux/phy/phy.h> |
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#include <linux/platform_device.h> |
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#include <linux/usb.h> |
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#include <linux/usb/hcd.h> |
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#include "ehci.h" |
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#define DRIVER_DESC "EHCI Exynos driver" |
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#define EHCI_INSNREG00(base) (base + 0x90) |
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#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25) |
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#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24) |
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#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23) |
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#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22) |
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#define EHCI_INSNREG00_ENABLE_DMA_BURST \ |
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(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \ |
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EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN) |
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static const char hcd_name[] = "ehci-exynos"; |
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static struct hc_driver __read_mostly exynos_ehci_hc_driver; |
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#define PHY_NUMBER 3 |
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struct exynos_ehci_hcd { |
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struct clk *clk; |
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struct device_node *of_node; |
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struct phy *phy[PHY_NUMBER]; |
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bool legacy_phy; |
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}; |
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#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv) |
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static int exynos_ehci_get_phy(struct device *dev, |
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struct exynos_ehci_hcd *exynos_ehci) |
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{ |
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struct device_node *child; |
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struct phy *phy; |
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int phy_number, num_phys; |
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int ret; |
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/* Get PHYs for the controller */ |
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num_phys = of_count_phandle_with_args(dev->of_node, "phys", |
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"#phy-cells"); |
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for (phy_number = 0; phy_number < num_phys; phy_number++) { |
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phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number); |
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if (IS_ERR(phy)) |
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return PTR_ERR(phy); |
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exynos_ehci->phy[phy_number] = phy; |
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} |
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if (num_phys > 0) |
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return 0; |
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/* Get PHYs using legacy bindings */ |
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for_each_available_child_of_node(dev->of_node, child) { |
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ret = of_property_read_u32(child, "reg", &phy_number); |
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if (ret) { |
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dev_err(dev, "Failed to parse device tree\n"); |
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of_node_put(child); |
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return ret; |
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} |
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if (phy_number >= PHY_NUMBER) { |
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dev_err(dev, "Invalid number of PHYs\n"); |
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of_node_put(child); |
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return -EINVAL; |
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} |
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phy = devm_of_phy_get(dev, child, NULL); |
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exynos_ehci->phy[phy_number] = phy; |
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if (IS_ERR(phy)) { |
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ret = PTR_ERR(phy); |
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if (ret == -EPROBE_DEFER) { |
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of_node_put(child); |
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return ret; |
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} else if (ret != -ENOSYS && ret != -ENODEV) { |
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dev_err(dev, |
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"Error retrieving usb2 phy: %d\n", ret); |
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of_node_put(child); |
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return ret; |
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} |
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} |
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} |
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exynos_ehci->legacy_phy = true; |
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return 0; |
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} |
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static int exynos_ehci_phy_enable(struct device *dev) |
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{ |
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struct usb_hcd *hcd = dev_get_drvdata(dev); |
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
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int i; |
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int ret = 0; |
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for (i = 0; ret == 0 && i < PHY_NUMBER; i++) |
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if (!IS_ERR(exynos_ehci->phy[i])) |
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ret = phy_power_on(exynos_ehci->phy[i]); |
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if (ret) |
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for (i--; i >= 0; i--) |
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if (!IS_ERR(exynos_ehci->phy[i])) |
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phy_power_off(exynos_ehci->phy[i]); |
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return ret; |
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} |
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static void exynos_ehci_phy_disable(struct device *dev) |
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{ |
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struct usb_hcd *hcd = dev_get_drvdata(dev); |
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
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int i; |
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for (i = 0; i < PHY_NUMBER; i++) |
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if (!IS_ERR(exynos_ehci->phy[i])) |
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phy_power_off(exynos_ehci->phy[i]); |
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} |
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static void exynos_setup_vbus_gpio(struct device *dev) |
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{ |
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int err; |
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int gpio; |
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if (!dev->of_node) |
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return; |
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gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0); |
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if (!gpio_is_valid(gpio)) |
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return; |
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err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH, |
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"ehci_vbus_gpio"); |
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if (err) |
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dev_err(dev, "can't request ehci vbus gpio %d", gpio); |
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} |
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static int exynos_ehci_probe(struct platform_device *pdev) |
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{ |
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struct exynos_ehci_hcd *exynos_ehci; |
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struct usb_hcd *hcd; |
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struct ehci_hcd *ehci; |
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struct resource *res; |
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int irq; |
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int err; |
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/* |
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* Right now device-tree probed devices don't get dma_mask set. |
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* Since shared usb code relies on it, set it here for now. |
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* Once we move to full device tree support this will vanish off. |
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*/ |
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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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exynos_setup_vbus_gpio(&pdev->dev); |
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hcd = usb_create_hcd(&exynos_ehci_hc_driver, |
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&pdev->dev, dev_name(&pdev->dev)); |
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if (!hcd) { |
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dev_err(&pdev->dev, "Unable to create HCD\n"); |
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return -ENOMEM; |
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} |
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exynos_ehci = to_exynos_ehci(hcd); |
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err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci); |
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if (err) |
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goto fail_clk; |
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exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost"); |
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if (IS_ERR(exynos_ehci->clk)) { |
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dev_err(&pdev->dev, "Failed to get usbhost clock\n"); |
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err = PTR_ERR(exynos_ehci->clk); |
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goto fail_clk; |
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} |
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err = clk_prepare_enable(exynos_ehci->clk); |
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if (err) |
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goto fail_clk; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(hcd->regs)) { |
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err = PTR_ERR(hcd->regs); |
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goto fail_io; |
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} |
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hcd->rsrc_start = res->start; |
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hcd->rsrc_len = resource_size(res); |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) { |
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err = irq; |
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goto fail_io; |
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} |
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err = exynos_ehci_phy_enable(&pdev->dev); |
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if (err) { |
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dev_err(&pdev->dev, "Failed to enable USB phy\n"); |
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goto fail_io; |
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} |
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ehci = hcd_to_ehci(hcd); |
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ehci->caps = hcd->regs; |
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/* |
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* Workaround: reset of_node pointer to avoid conflict between legacy |
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* Exynos EHCI port subnodes and generic USB device bindings |
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*/ |
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exynos_ehci->of_node = pdev->dev.of_node; |
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if (exynos_ehci->legacy_phy) |
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pdev->dev.of_node = NULL; |
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/* DMA burst Enable */ |
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writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); |
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err = usb_add_hcd(hcd, irq, IRQF_SHARED); |
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if (err) { |
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dev_err(&pdev->dev, "Failed to add USB HCD\n"); |
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goto fail_add_hcd; |
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} |
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device_wakeup_enable(hcd->self.controller); |
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platform_set_drvdata(pdev, hcd); |
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return 0; |
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fail_add_hcd: |
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exynos_ehci_phy_disable(&pdev->dev); |
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pdev->dev.of_node = exynos_ehci->of_node; |
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fail_io: |
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clk_disable_unprepare(exynos_ehci->clk); |
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fail_clk: |
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usb_put_hcd(hcd); |
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return err; |
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} |
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static int exynos_ehci_remove(struct platform_device *pdev) |
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{ |
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struct usb_hcd *hcd = platform_get_drvdata(pdev); |
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
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pdev->dev.of_node = exynos_ehci->of_node; |
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usb_remove_hcd(hcd); |
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exynos_ehci_phy_disable(&pdev->dev); |
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clk_disable_unprepare(exynos_ehci->clk); |
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usb_put_hcd(hcd); |
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return 0; |
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} |
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#ifdef CONFIG_PM |
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static int exynos_ehci_suspend(struct device *dev) |
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{ |
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struct usb_hcd *hcd = dev_get_drvdata(dev); |
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
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bool do_wakeup = device_may_wakeup(dev); |
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int rc; |
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rc = ehci_suspend(hcd, do_wakeup); |
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if (rc) |
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return rc; |
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exynos_ehci_phy_disable(dev); |
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clk_disable_unprepare(exynos_ehci->clk); |
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return rc; |
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} |
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static int exynos_ehci_resume(struct device *dev) |
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{ |
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struct usb_hcd *hcd = dev_get_drvdata(dev); |
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd); |
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int ret; |
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ret = clk_prepare_enable(exynos_ehci->clk); |
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if (ret) |
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return ret; |
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ret = exynos_ehci_phy_enable(dev); |
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if (ret) { |
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dev_err(dev, "Failed to enable USB phy\n"); |
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clk_disable_unprepare(exynos_ehci->clk); |
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return ret; |
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} |
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/* DMA burst Enable */ |
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writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs)); |
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ehci_resume(hcd, false); |
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return 0; |
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} |
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#else |
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#define exynos_ehci_suspend NULL |
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#define exynos_ehci_resume NULL |
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#endif |
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static const struct dev_pm_ops exynos_ehci_pm_ops = { |
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.suspend = exynos_ehci_suspend, |
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.resume = exynos_ehci_resume, |
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}; |
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#ifdef CONFIG_OF |
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static const struct of_device_id exynos_ehci_match[] = { |
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{ .compatible = "samsung,exynos4210-ehci" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, exynos_ehci_match); |
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#endif |
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static struct platform_driver exynos_ehci_driver = { |
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.probe = exynos_ehci_probe, |
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.remove = exynos_ehci_remove, |
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.shutdown = usb_hcd_platform_shutdown, |
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.driver = { |
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.name = "exynos-ehci", |
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.pm = &exynos_ehci_pm_ops, |
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.of_match_table = of_match_ptr(exynos_ehci_match), |
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} |
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}; |
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static const struct ehci_driver_overrides exynos_overrides __initconst = { |
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.extra_priv_size = sizeof(struct exynos_ehci_hcd), |
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}; |
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static int __init ehci_exynos_init(void) |
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{ |
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if (usb_disabled()) |
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return -ENODEV; |
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pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
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ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides); |
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return platform_driver_register(&exynos_ehci_driver); |
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} |
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module_init(ehci_exynos_init); |
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static void __exit ehci_exynos_cleanup(void) |
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{ |
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platform_driver_unregister(&exynos_ehci_driver); |
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} |
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module_exit(ehci_exynos_cleanup); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_ALIAS("platform:exynos-ehci"); |
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MODULE_AUTHOR("Jingoo Han"); |
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MODULE_AUTHOR("Joonyoung Shim"); |
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MODULE_LICENSE("GPL v2");
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