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path: root/drivers/usb/host/ohci-da8xx.c
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Diffstat (limited to 'drivers/usb/host/ohci-da8xx.c')
-rw-r--r--drivers/usb/host/ohci-da8xx.c582
1 files changed, 582 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
new file mode 100644
index 000000000..d4818e8d6
--- /dev/null
+++ b/drivers/usb/host/ohci-da8xx.c
@@ -0,0 +1,582 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * TI DA8xx (OMAP-L1x) Bus Glue
+ *
+ * Derived from: ohci-omap.c and ohci-s3c2410.c
+ * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_data/usb-davinci.h>
+#include <linux/regulator/consumer.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <asm/unaligned.h>
+
+#include "ohci.h"
+
+#define DRIVER_DESC "DA8XX"
+#define DRV_NAME "ohci-da8xx"
+
+static struct hc_driver __read_mostly ohci_da8xx_hc_driver;
+
+static int (*orig_ohci_hub_control)(struct usb_hcd *hcd, u16 typeReq,
+ u16 wValue, u16 wIndex, char *buf, u16 wLength);
+static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
+
+struct da8xx_ohci_hcd {
+ struct usb_hcd *hcd;
+ struct clk *usb11_clk;
+ struct phy *usb11_phy;
+ struct regulator *vbus_reg;
+ struct notifier_block nb;
+ struct gpio_desc *oc_gpio;
+};
+
+#define to_da8xx_ohci(hcd) (struct da8xx_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
+
+/* Over-current indicator change bitmask */
+static volatile u16 ocic_mask;
+
+static int ohci_da8xx_enable(struct usb_hcd *hcd)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
+ int ret;
+
+ ret = clk_prepare_enable(da8xx_ohci->usb11_clk);
+ if (ret)
+ return ret;
+
+ ret = phy_init(da8xx_ohci->usb11_phy);
+ if (ret)
+ goto err_phy_init;
+
+ ret = phy_power_on(da8xx_ohci->usb11_phy);
+ if (ret)
+ goto err_phy_power_on;
+
+ return 0;
+
+err_phy_power_on:
+ phy_exit(da8xx_ohci->usb11_phy);
+err_phy_init:
+ clk_disable_unprepare(da8xx_ohci->usb11_clk);
+
+ return ret;
+}
+
+static void ohci_da8xx_disable(struct usb_hcd *hcd)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
+
+ phy_power_off(da8xx_ohci->usb11_phy);
+ phy_exit(da8xx_ohci->usb11_phy);
+ clk_disable_unprepare(da8xx_ohci->usb11_clk);
+}
+
+static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
+ struct device *dev = hcd->self.controller;
+ int ret;
+
+ if (!da8xx_ohci->vbus_reg)
+ return 0;
+
+ if (on) {
+ ret = regulator_enable(da8xx_ohci->vbus_reg);
+ if (ret) {
+ dev_err(dev, "Failed to enable regulator: %d\n", ret);
+ return ret;
+ }
+ } else {
+ ret = regulator_disable(da8xx_ohci->vbus_reg);
+ if (ret) {
+ dev_err(dev, "Failed to disable regulator: %d\n", ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int ohci_da8xx_get_power(struct usb_hcd *hcd)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
+
+ if (da8xx_ohci->vbus_reg)
+ return regulator_is_enabled(da8xx_ohci->vbus_reg);
+
+ return 1;
+}
+
+static int ohci_da8xx_get_oci(struct usb_hcd *hcd)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
+ unsigned int flags;
+ int ret;
+
+ if (da8xx_ohci->oc_gpio)
+ return gpiod_get_value_cansleep(da8xx_ohci->oc_gpio);
+
+ if (!da8xx_ohci->vbus_reg)
+ return 0;
+
+ ret = regulator_get_error_flags(da8xx_ohci->vbus_reg, &flags);
+ if (ret)
+ return ret;
+
+ if (flags & REGULATOR_ERROR_OVER_CURRENT)
+ return 1;
+
+ return 0;
+}
+
+static int ohci_da8xx_has_set_power(struct usb_hcd *hcd)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
+
+ if (da8xx_ohci->vbus_reg)
+ return 1;
+
+ return 0;
+}
+
+static int ohci_da8xx_has_oci(struct usb_hcd *hcd)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
+
+ if (da8xx_ohci->oc_gpio)
+ return 1;
+
+ if (da8xx_ohci->vbus_reg)
+ return 1;
+
+ return 0;
+}
+
+static int ohci_da8xx_has_potpgt(struct usb_hcd *hcd)
+{
+ struct device *dev = hcd->self.controller;
+ struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
+
+ if (hub && hub->potpgt)
+ return 1;
+
+ return 0;
+}
+
+static int ohci_da8xx_regulator_event(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci =
+ container_of(nb, struct da8xx_ohci_hcd, nb);
+
+ if (event & REGULATOR_EVENT_OVER_CURRENT) {
+ ocic_mask |= 1 << 1;
+ ohci_da8xx_set_power(da8xx_ohci->hcd, 0);
+ }
+
+ return 0;
+}
+
+static irqreturn_t ohci_da8xx_oc_thread(int irq, void *data)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = data;
+ struct device *dev = da8xx_ohci->hcd->self.controller;
+ int ret;
+
+ if (gpiod_get_value_cansleep(da8xx_ohci->oc_gpio) &&
+ da8xx_ohci->vbus_reg) {
+ ret = regulator_disable(da8xx_ohci->vbus_reg);
+ if (ret)
+ dev_err(dev, "Failed to disable regulator: %d\n", ret);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int ohci_da8xx_register_notify(struct usb_hcd *hcd)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd);
+ struct device *dev = hcd->self.controller;
+ int ret = 0;
+
+ if (!da8xx_ohci->oc_gpio && da8xx_ohci->vbus_reg) {
+ da8xx_ohci->nb.notifier_call = ohci_da8xx_regulator_event;
+ ret = devm_regulator_register_notifier(da8xx_ohci->vbus_reg,
+ &da8xx_ohci->nb);
+ }
+
+ if (ret)
+ dev_err(dev, "Failed to register notifier: %d\n", ret);
+
+ return ret;
+}
+
+static int ohci_da8xx_reset(struct usb_hcd *hcd)
+{
+ struct device *dev = hcd->self.controller;
+ struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ int result;
+ u32 rh_a;
+
+ dev_dbg(dev, "starting USB controller\n");
+
+ result = ohci_da8xx_enable(hcd);
+ if (result < 0)
+ return result;
+
+ /*
+ * DA8xx only have 1 port connected to the pins but the HC root hub
+ * register A reports 2 ports, thus we'll have to override it...
+ */
+ ohci->num_ports = 1;
+
+ result = ohci_setup(hcd);
+ if (result < 0) {
+ ohci_da8xx_disable(hcd);
+ return result;
+ }
+
+ /*
+ * Since we're providing a board-specific root hub port power control
+ * and over-current reporting, we have to override the HC root hub A
+ * register's default value, so that ohci_hub_control() could return
+ * the correct hub descriptor...
+ */
+ rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
+ if (ohci_da8xx_has_set_power(hcd)) {
+ rh_a &= ~RH_A_NPS;
+ rh_a |= RH_A_PSM;
+ }
+ if (ohci_da8xx_has_oci(hcd)) {
+ rh_a &= ~RH_A_NOCP;
+ rh_a |= RH_A_OCPM;
+ }
+ if (ohci_da8xx_has_potpgt(hcd)) {
+ rh_a &= ~RH_A_POTPGT;
+ rh_a |= hub->potpgt << 24;
+ }
+ ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
+
+ return result;
+}
+
+/*
+ * Update the status data from the hub with the over-current indicator change.
+ */
+static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+ int length = orig_ohci_hub_status_data(hcd, buf);
+
+ /* See if we have OCIC bit set on port 1 */
+ if (ocic_mask & (1 << 1)) {
+ dev_dbg(hcd->self.controller, "over-current indicator change "
+ "on port 1\n");
+
+ if (!length)
+ length = 1;
+
+ buf[0] |= 1 << 1;
+ }
+ return length;
+}
+
+/*
+ * Look at the control requests to the root hub and see if we need to override.
+ */
+static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
+ u16 wIndex, char *buf, u16 wLength)
+{
+ struct device *dev = hcd->self.controller;
+ int temp;
+
+ switch (typeReq) {
+ case GetPortStatus:
+ /* Check the port number */
+ if (wIndex != 1)
+ break;
+
+ dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
+
+ temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
+
+ /* The port power status (PPS) bit defaults to 1 */
+ if (!ohci_da8xx_get_power(hcd))
+ temp &= ~RH_PS_PPS;
+
+ /* The port over-current indicator (POCI) bit is always 0 */
+ if (ohci_da8xx_get_oci(hcd) > 0)
+ temp |= RH_PS_POCI;
+
+ /* The over-current indicator change (OCIC) bit is 0 too */
+ if (ocic_mask & (1 << wIndex))
+ temp |= RH_PS_OCIC;
+
+ put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
+ return 0;
+ case SetPortFeature:
+ temp = 1;
+ goto check_port;
+ case ClearPortFeature:
+ temp = 0;
+
+check_port:
+ /* Check the port number */
+ if (wIndex != 1)
+ break;
+
+ switch (wValue) {
+ case USB_PORT_FEAT_POWER:
+ dev_dbg(dev, "%sPortFeature(%u): %s\n",
+ temp ? "Set" : "Clear", wIndex, "POWER");
+
+ return ohci_da8xx_set_power(hcd, temp) ? -EPIPE : 0;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ dev_dbg(dev, "%sPortFeature(%u): %s\n",
+ temp ? "Set" : "Clear", wIndex,
+ "C_OVER_CURRENT");
+
+ if (temp)
+ ocic_mask |= 1 << wIndex;
+ else
+ ocic_mask &= ~(1 << wIndex);
+ return 0;
+ }
+ }
+
+ return orig_ohci_hub_control(hcd, typeReq, wValue,
+ wIndex, buf, wLength);
+}
+
+/*-------------------------------------------------------------------------*/
+#ifdef CONFIG_OF
+static const struct of_device_id da8xx_ohci_ids[] = {
+ { .compatible = "ti,da830-ohci" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, da8xx_ohci_ids);
+#endif
+
+static int ohci_da8xx_probe(struct platform_device *pdev)
+{
+ struct da8xx_ohci_hcd *da8xx_ohci;
+ struct device *dev = &pdev->dev;
+ int error, hcd_irq, oc_irq;
+ struct usb_hcd *hcd;
+ struct resource *mem;
+
+ hcd = usb_create_hcd(&ohci_da8xx_hc_driver, dev, dev_name(dev));
+ if (!hcd)
+ return -ENOMEM;
+
+ da8xx_ohci = to_da8xx_ohci(hcd);
+ da8xx_ohci->hcd = hcd;
+
+ da8xx_ohci->usb11_clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(da8xx_ohci->usb11_clk)) {
+ error = PTR_ERR(da8xx_ohci->usb11_clk);
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get clock.\n");
+ goto err;
+ }
+
+ da8xx_ohci->usb11_phy = devm_phy_get(dev, "usb-phy");
+ if (IS_ERR(da8xx_ohci->usb11_phy)) {
+ error = PTR_ERR(da8xx_ohci->usb11_phy);
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get phy.\n");
+ goto err;
+ }
+
+ da8xx_ohci->vbus_reg = devm_regulator_get_optional(dev, "vbus");
+ if (IS_ERR(da8xx_ohci->vbus_reg)) {
+ error = PTR_ERR(da8xx_ohci->vbus_reg);
+ if (error == -ENODEV) {
+ da8xx_ohci->vbus_reg = NULL;
+ } else if (error == -EPROBE_DEFER) {
+ goto err;
+ } else {
+ dev_err(dev, "Failed to get regulator\n");
+ goto err;
+ }
+ }
+
+ da8xx_ohci->oc_gpio = devm_gpiod_get_optional(dev, "oc", GPIOD_IN);
+ if (IS_ERR(da8xx_ohci->oc_gpio)) {
+ error = PTR_ERR(da8xx_ohci->oc_gpio);
+ goto err;
+ }
+
+ if (da8xx_ohci->oc_gpio) {
+ oc_irq = gpiod_to_irq(da8xx_ohci->oc_gpio);
+ if (oc_irq < 0) {
+ error = oc_irq;
+ goto err;
+ }
+
+ error = devm_request_threaded_irq(dev, oc_irq, NULL,
+ ohci_da8xx_oc_thread, IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "OHCI over-current indicator", da8xx_ohci);
+ if (error)
+ goto err;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ hcd->regs = devm_ioremap_resource(dev, mem);
+ if (IS_ERR(hcd->regs)) {
+ error = PTR_ERR(hcd->regs);
+ goto err;
+ }
+ hcd->rsrc_start = mem->start;
+ hcd->rsrc_len = resource_size(mem);
+
+ hcd_irq = platform_get_irq(pdev, 0);
+ if (hcd_irq < 0) {
+ error = -ENODEV;
+ goto err;
+ }
+
+ error = usb_add_hcd(hcd, hcd_irq, 0);
+ if (error)
+ goto err;
+
+ device_wakeup_enable(hcd->self.controller);
+
+ error = ohci_da8xx_register_notify(hcd);
+ if (error)
+ goto err_remove_hcd;
+
+ return 0;
+
+err_remove_hcd:
+ usb_remove_hcd(hcd);
+err:
+ usb_put_hcd(hcd);
+ return error;
+}
+
+static int ohci_da8xx_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ usb_remove_hcd(hcd);
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int ohci_da8xx_suspend(struct platform_device *pdev,
+ pm_message_t message)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ bool do_wakeup = device_may_wakeup(&pdev->dev);
+ int ret;
+
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ ret = ohci_suspend(hcd, do_wakeup);
+ if (ret)
+ return ret;
+
+ ohci_da8xx_disable(hcd);
+ hcd->state = HC_STATE_SUSPENDED;
+
+ return ret;
+}
+
+static int ohci_da8xx_resume(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ int ret;
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ ret = ohci_da8xx_enable(hcd);
+ if (ret)
+ return ret;
+
+ ohci_resume(hcd, false);
+
+ return 0;
+}
+#endif
+
+static const struct ohci_driver_overrides da8xx_overrides __initconst = {
+ .reset = ohci_da8xx_reset,
+ .extra_priv_size = sizeof(struct da8xx_ohci_hcd),
+};
+
+/*
+ * Driver definition to register with platform structure.
+ */
+static struct platform_driver ohci_hcd_da8xx_driver = {
+ .probe = ohci_da8xx_probe,
+ .remove = ohci_da8xx_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+#ifdef CONFIG_PM
+ .suspend = ohci_da8xx_suspend,
+ .resume = ohci_da8xx_resume,
+#endif
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = of_match_ptr(da8xx_ohci_ids),
+ },
+};
+
+static int __init ohci_da8xx_init(void)
+{
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ ohci_init_driver(&ohci_da8xx_hc_driver, &da8xx_overrides);
+
+ /*
+ * The Davinci da8xx HW has some unusual quirks, which require
+ * da8xx-specific workarounds. We override certain hc_driver
+ * functions here to achieve that. We explicitly do not enhance
+ * ohci_driver_overrides to allow this more easily, since this
+ * is an unusual case, and we don't want to encourage others to
+ * override these functions by making it too easy.
+ */
+
+ orig_ohci_hub_control = ohci_da8xx_hc_driver.hub_control;
+ orig_ohci_hub_status_data = ohci_da8xx_hc_driver.hub_status_data;
+
+ ohci_da8xx_hc_driver.hub_status_data = ohci_da8xx_hub_status_data;
+ ohci_da8xx_hc_driver.hub_control = ohci_da8xx_hub_control;
+
+ return platform_driver_register(&ohci_hcd_da8xx_driver);
+}
+module_init(ohci_da8xx_init);
+
+static void __exit ohci_da8xx_exit(void)
+{
+ platform_driver_unregister(&ohci_hcd_da8xx_driver);
+}
+module_exit(ohci_da8xx_exit);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);