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");