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path: root/drivers/usb/host/ehci-exynos.c
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Diffstat (limited to 'drivers/usb/host/ehci-exynos.c')
-rw-r--r--drivers/usb/host/ehci-exynos.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
new file mode 100644
index 000000000000..e97c198e052f
--- /dev/null
+++ b/drivers/usb/host/ehci-exynos.c
@@ -0,0 +1,300 @@
+/*
+ * SAMSUNG EXYNOS USB HOST EHCI Controller
+ *
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * Author: Jingoo Han <jg1.han@samsung.com>
+ * Author: Joonyoung Shim <jy0922.shim@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/usb/phy.h>
+#include <linux/usb/samsung_usb_phy.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/otg.h>
+
+#include "ehci.h"
+
+#define DRIVER_DESC "EHCI EXYNOS driver"
+
+#define EHCI_INSNREG00(base) (base + 0x90)
+#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
+#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
+#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
+#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
+#define EHCI_INSNREG00_ENABLE_DMA_BURST \
+ (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
+ EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
+
+static const char hcd_name[] = "ehci-exynos";
+static struct hc_driver __read_mostly exynos_ehci_hc_driver;
+
+struct exynos_ehci_hcd {
+ struct clk *clk;
+ struct usb_phy *phy;
+ struct usb_otg *otg;
+};
+
+#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
+
+static void exynos_setup_vbus_gpio(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ int err;
+ int gpio;
+
+ if (!dev->of_node)
+ return;
+
+ gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
+ if (!gpio_is_valid(gpio))
+ return;
+
+ err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
+ "ehci_vbus_gpio");
+ if (err)
+ dev_err(dev, "can't request ehci vbus gpio %d", gpio);
+}
+
+static int exynos_ehci_probe(struct platform_device *pdev)
+{
+ struct exynos_ehci_hcd *exynos_ehci;
+ struct usb_hcd *hcd;
+ struct ehci_hcd *ehci;
+ struct resource *res;
+ struct usb_phy *phy;
+ int irq;
+ int err;
+
+ /*
+ * Right now device-tree probed devices don't get dma_mask set.
+ * Since shared usb code relies on it, set it here for now.
+ * Once we move to full device tree support this will vanish off.
+ */
+ err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (err)
+ return err;
+
+ exynos_setup_vbus_gpio(pdev);
+
+ hcd = usb_create_hcd(&exynos_ehci_hc_driver,
+ &pdev->dev, dev_name(&pdev->dev));
+ if (!hcd) {
+ dev_err(&pdev->dev, "Unable to create HCD\n");
+ return -ENOMEM;
+ }
+ exynos_ehci = to_exynos_ehci(hcd);
+
+ if (of_device_is_compatible(pdev->dev.of_node,
+ "samsung,exynos5440-ehci"))
+ goto skip_phy;
+
+ phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
+ if (IS_ERR(phy)) {
+ usb_put_hcd(hcd);
+ dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
+ return -EPROBE_DEFER;
+ } else {
+ exynos_ehci->phy = phy;
+ exynos_ehci->otg = phy->otg;
+ }
+
+skip_phy:
+
+ exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
+
+ if (IS_ERR(exynos_ehci->clk)) {
+ dev_err(&pdev->dev, "Failed to get usbhost clock\n");
+ err = PTR_ERR(exynos_ehci->clk);
+ goto fail_clk;
+ }
+
+ err = clk_prepare_enable(exynos_ehci->clk);
+ if (err)
+ goto fail_clk;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Failed to get I/O memory\n");
+ err = -ENXIO;
+ goto fail_io;
+ }
+
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+ hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
+ if (!hcd->regs) {
+ dev_err(&pdev->dev, "Failed to remap I/O memory\n");
+ err = -ENOMEM;
+ goto fail_io;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (!irq) {
+ dev_err(&pdev->dev, "Failed to get IRQ\n");
+ err = -ENODEV;
+ goto fail_io;
+ }
+
+ if (exynos_ehci->otg)
+ exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
+
+ if (exynos_ehci->phy)
+ usb_phy_init(exynos_ehci->phy);
+
+ ehci = hcd_to_ehci(hcd);
+ ehci->caps = hcd->regs;
+
+ /* DMA burst Enable */
+ writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
+
+ err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to add USB HCD\n");
+ goto fail_add_hcd;
+ }
+
+ platform_set_drvdata(pdev, hcd);
+
+ return 0;
+
+fail_add_hcd:
+ if (exynos_ehci->phy)
+ usb_phy_shutdown(exynos_ehci->phy);
+fail_io:
+ clk_disable_unprepare(exynos_ehci->clk);
+fail_clk:
+ usb_put_hcd(hcd);
+ return err;
+}
+
+static int exynos_ehci_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+
+ usb_remove_hcd(hcd);
+
+ if (exynos_ehci->otg)
+ exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
+
+ if (exynos_ehci->phy)
+ usb_phy_shutdown(exynos_ehci->phy);
+
+ clk_disable_unprepare(exynos_ehci->clk);
+
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int exynos_ehci_suspend(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+
+ bool do_wakeup = device_may_wakeup(dev);
+ int rc;
+
+ rc = ehci_suspend(hcd, do_wakeup);
+
+ if (exynos_ehci->otg)
+ exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
+
+ if (exynos_ehci->phy)
+ usb_phy_shutdown(exynos_ehci->phy);
+
+ clk_disable_unprepare(exynos_ehci->clk);
+
+ return rc;
+}
+
+static int exynos_ehci_resume(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+
+ clk_prepare_enable(exynos_ehci->clk);
+
+ if (exynos_ehci->otg)
+ exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
+
+ if (exynos_ehci->phy)
+ usb_phy_init(exynos_ehci->phy);
+
+ /* DMA burst Enable */
+ writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
+
+ ehci_resume(hcd, false);
+ return 0;
+}
+#else
+#define exynos_ehci_suspend NULL
+#define exynos_ehci_resume NULL
+#endif
+
+static const struct dev_pm_ops exynos_ehci_pm_ops = {
+ .suspend = exynos_ehci_suspend,
+ .resume = exynos_ehci_resume,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_ehci_match[] = {
+ { .compatible = "samsung,exynos4210-ehci" },
+ { .compatible = "samsung,exynos5440-ehci" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, exynos_ehci_match);
+#endif
+
+static struct platform_driver exynos_ehci_driver = {
+ .probe = exynos_ehci_probe,
+ .remove = exynos_ehci_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+ .driver = {
+ .name = "exynos-ehci",
+ .owner = THIS_MODULE,
+ .pm = &exynos_ehci_pm_ops,
+ .of_match_table = of_match_ptr(exynos_ehci_match),
+ }
+};
+static const struct ehci_driver_overrides exynos_overrides __initdata = {
+ .extra_priv_size = sizeof(struct exynos_ehci_hcd),
+};
+
+static int __init ehci_exynos_init(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+ ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
+ return platform_driver_register(&exynos_ehci_driver);
+}
+module_init(ehci_exynos_init);
+
+static void __exit ehci_exynos_cleanup(void)
+{
+ platform_driver_unregister(&exynos_ehci_driver);
+}
+module_exit(ehci_exynos_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:exynos-ehci");
+MODULE_AUTHOR("Jingoo Han");
+MODULE_AUTHOR("Joonyoung Shim");
+MODULE_LICENSE("GPL v2");
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