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-rw-r--r--drivers/usb/host/ohci-omap.c439
1 files changed, 439 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
new file mode 100644
index 000000000..cb29701df
--- /dev/null
+++ b/drivers/usb/host/ohci-omap.c
@@ -0,0 +1,439 @@
+// SPDX-License-Identifier: GPL-1.0+
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2005 David Brownell
+ * (C) Copyright 2002 Hewlett-Packard Company
+ *
+ * OMAP Bus Glue
+ *
+ * Modified for OMAP by Tony Lindgren <tony@atomide.com>
+ * Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
+ * and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com>
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb/otg.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/usb-omap1.h>
+#include <linux/soc/ti/omap1-usb.h>
+#include <linux/soc/ti/omap1-mux.h>
+#include <linux/soc/ti/omap1-soc.h>
+#include <linux/soc/ti/omap1-io.h>
+#include <linux/signal.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ohci.h"
+
+#include <asm/io.h>
+#include <asm/mach-types.h>
+
+#define DRIVER_DESC "OHCI OMAP driver"
+
+struct ohci_omap_priv {
+ struct clk *usb_host_ck;
+ struct clk *usb_dc_ck;
+ struct gpio_desc *power;
+ struct gpio_desc *overcurrent;
+};
+
+static const char hcd_name[] = "ohci-omap";
+static struct hc_driver __read_mostly ohci_omap_hc_driver;
+
+#define hcd_to_ohci_omap_priv(h) \
+ ((struct ohci_omap_priv *)hcd_to_ohci(h)->priv)
+
+static void omap_ohci_clock_power(struct ohci_omap_priv *priv, int on)
+{
+ if (on) {
+ clk_enable(priv->usb_dc_ck);
+ clk_enable(priv->usb_host_ck);
+ /* guesstimate for T5 == 1x 32K clock + APLL lock time */
+ udelay(100);
+ } else {
+ clk_disable(priv->usb_host_ck);
+ clk_disable(priv->usb_dc_ck);
+ }
+}
+
+#ifdef CONFIG_USB_OTG
+
+static void start_hnp(struct ohci_hcd *ohci)
+{
+ struct usb_hcd *hcd = ohci_to_hcd(ohci);
+ const unsigned port = hcd->self.otg_port - 1;
+ unsigned long flags;
+ u32 l;
+
+ otg_start_hnp(hcd->usb_phy->otg);
+
+ local_irq_save(flags);
+ hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND;
+ writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
+ l = omap_readl(OTG_CTRL);
+ l &= ~OTG_A_BUSREQ;
+ omap_writel(l, OTG_CTRL);
+ local_irq_restore(flags);
+}
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+static int ohci_omap_reset(struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ struct omap_usb_config *config = dev_get_platdata(hcd->self.controller);
+ struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
+ int need_transceiver = (config->otg != 0);
+ int ret;
+
+ dev_dbg(hcd->self.controller, "starting USB Controller\n");
+
+ if (config->otg) {
+ hcd->self.otg_port = config->otg;
+ /* default/minimum OTG power budget: 8 mA */
+ hcd->power_budget = 8;
+ }
+
+ /* boards can use OTG transceivers in non-OTG modes */
+ need_transceiver = need_transceiver
+ || machine_is_omap_h2() || machine_is_omap_h3();
+
+ /* XXX OMAP16xx only */
+ if (config->ocpi_enable)
+ config->ocpi_enable();
+
+#ifdef CONFIG_USB_OTG
+ if (need_transceiver) {
+ hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
+ if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
+ int status = otg_set_host(hcd->usb_phy->otg,
+ &ohci_to_hcd(ohci)->self);
+ dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
+ hcd->usb_phy->label, status);
+ if (status) {
+ usb_put_phy(hcd->usb_phy);
+ return status;
+ }
+ } else {
+ return -EPROBE_DEFER;
+ }
+ hcd->skip_phy_initialization = 1;
+ ohci->start_hnp = start_hnp;
+ }
+#endif
+
+ omap_ohci_clock_power(priv, 1);
+
+ if (config->lb_reset)
+ config->lb_reset();
+
+ ret = ohci_setup(hcd);
+ if (ret < 0)
+ return ret;
+
+ if (config->otg || config->rwc) {
+ ohci->hc_control = OHCI_CTRL_RWC;
+ writel(OHCI_CTRL_RWC, &ohci->regs->control);
+ }
+
+ /* board-specific power switching and overcurrent support */
+ if (machine_is_omap_osk() || machine_is_omap_innovator()) {
+ u32 rh = roothub_a (ohci);
+
+ /* power switching (ganged by default) */
+ rh &= ~RH_A_NPS;
+
+ /* TPS2045 switch for internal transceiver (port 1) */
+ if (machine_is_omap_osk()) {
+ ohci_to_hcd(ohci)->power_budget = 250;
+
+ rh &= ~RH_A_NOCP;
+
+ /* gpio9 for overcurrent detction */
+ omap_cfg_reg(W8_1610_GPIO9);
+
+ /* for paranoia's sake: disable USB.PUEN */
+ omap_cfg_reg(W4_USB_HIGHZ);
+ }
+ ohci_writel(ohci, rh, &ohci->regs->roothub.a);
+ ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
+ } else if (machine_is_nokia770()) {
+ /* We require a self-powered hub, which should have
+ * plenty of power. */
+ ohci_to_hcd(ohci)->power_budget = 0;
+ }
+
+ /* FIXME hub_wq hub requests should manage power switching */
+ if (config->transceiver_power)
+ return config->transceiver_power(1);
+
+ if (priv->power)
+ gpiod_set_value_cansleep(priv->power, 0);
+
+ /* board init will have already handled HMC and mux setup.
+ * any external transceiver should already be initialized
+ * too, so all configured ports use the right signaling now.
+ */
+
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * ohci_hcd_omap_probe - initialize OMAP-based HCDs
+ * @pdev: USB controller to probe
+ *
+ * Context: task context, might sleep
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ */
+static int ohci_hcd_omap_probe(struct platform_device *pdev)
+{
+ int retval, irq;
+ struct usb_hcd *hcd = 0;
+ struct ohci_omap_priv *priv;
+
+ if (pdev->num_resources != 2) {
+ dev_err(&pdev->dev, "invalid num_resources: %i\n",
+ pdev->num_resources);
+ return -ENODEV;
+ }
+
+ if (pdev->resource[0].flags != IORESOURCE_MEM
+ || pdev->resource[1].flags != IORESOURCE_IRQ) {
+ dev_err(&pdev->dev, "invalid resource type\n");
+ return -ENODEV;
+ }
+
+ hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev,
+ dev_name(&pdev->dev));
+ if (!hcd)
+ return -ENOMEM;
+
+ hcd->rsrc_start = pdev->resource[0].start;
+ hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
+ priv = hcd_to_ohci_omap_priv(hcd);
+
+ /* Obtain two optional GPIO lines */
+ priv->power = devm_gpiod_get_optional(&pdev->dev, "power", GPIOD_ASIS);
+ if (IS_ERR(priv->power)) {
+ retval = PTR_ERR(priv->power);
+ goto err_put_hcd;
+ }
+ if (priv->power)
+ gpiod_set_consumer_name(priv->power, "OHCI power");
+
+ /*
+ * This "overcurrent" GPIO line isn't really used in the code,
+ * but has a designated hardware function.
+ * TODO: implement proper overcurrent handling.
+ */
+ priv->overcurrent = devm_gpiod_get_optional(&pdev->dev, "overcurrent",
+ GPIOD_IN);
+ if (IS_ERR(priv->overcurrent)) {
+ retval = PTR_ERR(priv->overcurrent);
+ goto err_put_hcd;
+ }
+ if (priv->overcurrent)
+ gpiod_set_consumer_name(priv->overcurrent, "OHCI overcurrent");
+
+ priv->usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
+ if (IS_ERR(priv->usb_host_ck)) {
+ retval = PTR_ERR(priv->usb_host_ck);
+ goto err_put_hcd;
+ }
+
+ retval = clk_prepare(priv->usb_host_ck);
+ if (retval)
+ goto err_put_host_ck;
+
+ if (!cpu_is_omap15xx())
+ priv->usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
+ else
+ priv->usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
+
+ if (IS_ERR(priv->usb_dc_ck)) {
+ retval = PTR_ERR(priv->usb_dc_ck);
+ goto err_unprepare_host_ck;
+ }
+
+ retval = clk_prepare(priv->usb_dc_ck);
+ if (retval)
+ goto err_put_dc_ck;
+
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+ dev_dbg(&pdev->dev, "request_mem_region failed\n");
+ retval = -EBUSY;
+ goto err_unprepare_dc_ck;
+ }
+
+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+ if (!hcd->regs) {
+ dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
+ retval = -ENOMEM;
+ goto err2;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ retval = irq;
+ goto err3;
+ }
+ retval = usb_add_hcd(hcd, irq, 0);
+ if (retval)
+ goto err3;
+
+ device_wakeup_enable(hcd->self.controller);
+ return 0;
+err3:
+ iounmap(hcd->regs);
+err2:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err_unprepare_dc_ck:
+ clk_unprepare(priv->usb_dc_ck);
+err_put_dc_ck:
+ clk_put(priv->usb_dc_ck);
+err_unprepare_host_ck:
+ clk_unprepare(priv->usb_host_ck);
+err_put_host_ck:
+ clk_put(priv->usb_host_ck);
+err_put_hcd:
+ usb_put_hcd(hcd);
+ return retval;
+}
+
+
+/* may be called with controller, bus, and devices active */
+
+/**
+ * ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs
+ * @pdev: USB Host Controller being removed
+ *
+ * Context: task context, might sleep
+ *
+ * Reverses the effect of ohci_hcd_omap_probe(), first invoking
+ * the HCD's stop() method. It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ */
+static int ohci_hcd_omap_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
+
+ dev_dbg(hcd->self.controller, "stopping USB Controller\n");
+ usb_remove_hcd(hcd);
+ omap_ohci_clock_power(priv, 0);
+ if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
+ (void) otg_set_host(hcd->usb_phy->otg, 0);
+ usb_put_phy(hcd->usb_phy);
+ }
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ clk_unprepare(priv->usb_dc_ck);
+ clk_put(priv->usb_dc_ck);
+ clk_unprepare(priv->usb_host_ck);
+ clk_put(priv->usb_host_ck);
+ usb_put_hcd(hcd);
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_PM
+
+static int ohci_omap_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);
+ struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(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;
+
+ omap_ohci_clock_power(priv, 0);
+ return ret;
+}
+
+static int ohci_omap_resume(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ omap_ohci_clock_power(priv, 1);
+ ohci_resume(hcd, false);
+ return 0;
+}
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Driver definition to register with the OMAP bus
+ */
+static struct platform_driver ohci_hcd_omap_driver = {
+ .probe = ohci_hcd_omap_probe,
+ .remove = ohci_hcd_omap_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+#ifdef CONFIG_PM
+ .suspend = ohci_omap_suspend,
+ .resume = ohci_omap_resume,
+#endif
+ .driver = {
+ .name = "ohci",
+ },
+};
+
+static const struct ohci_driver_overrides omap_overrides __initconst = {
+ .product_desc = "OMAP OHCI",
+ .reset = ohci_omap_reset,
+ .extra_priv_size = sizeof(struct ohci_omap_priv),
+};
+
+static int __init ohci_omap_init(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
+ return platform_driver_register(&ohci_hcd_omap_driver);
+}
+module_init(ohci_omap_init);
+
+static void __exit ohci_omap_cleanup(void)
+{
+ platform_driver_unregister(&ohci_hcd_omap_driver);
+}
+module_exit(ohci_omap_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:ohci");
+MODULE_LICENSE("GPL");