367 строки
8.5 KiB
C
367 строки
8.5 KiB
C
// 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 <jg1.han@samsung.com>
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* Author: Joonyoung Shim <jy0922.shim@samsung.com>
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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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