1 files changed, 501 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c
new file mode 100644
index 000000000..85a0a9ae0
--- /dev/null
+++ b/drivers/usb/host/ohci-s3c2410.c
@@ -0,0 +1,501 @@
+// SPDX-License-Identifier: GPL-1.0+
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ * (C) Copyright 2002 Hewlett-Packard Company
+ *
+ * USB Bus Glue for Samsung S3C2410
+ *
+ * Written by Christopher Hoover <ch@hpl.hp.com>
+ * Based on fragments of previous driver by Russell King et al.
+ *
+ * Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c
+ *	by Ben Dooks, <ben@simtec.co.uk>
+ *	Copyright (C) 2004 Simtec Electronics
+ *
+ * Thanks to basprog@mail.ru for updates to newer kernels
+ *
+ * This file is licenced under the GPL.
+*/
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/usb-ohci-s3c2410.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ohci.h"
+
+
+#define valid_port(idx) ((idx) == 1 || (idx) == 2)
+
+/* clock device associated with the hcd */
+
+
+#define DRIVER_DESC "OHCI S3C2410 driver"
+
+static struct clk *clk;
+static struct clk *usb_clk;
+
+static struct hc_driver __read_mostly ohci_s3c2410_hc_driver;
+
+/* forward definitions */
+
+static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
+
+/* conversion functions */
+
+static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
+{
+	return dev_get_platdata(hcd->self.controller);
+}
+
+static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
+{
+	struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
+
+	dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
+
+	clk_prepare_enable(usb_clk);
+	mdelay(2);			/* let the bus clock stabilise */
+
+	clk_prepare_enable(clk);
+
+	if (info != NULL) {
+		info->hcd	= hcd;
+		info->report_oc = s3c2410_hcd_oc;
+
+		if (info->enable_oc != NULL)
+			(info->enable_oc)(info, 1);
+	}
+}
+
+static void s3c2410_stop_hc(struct platform_device *dev)
+{
+	struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
+
+	dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
+
+	if (info != NULL) {
+		info->report_oc = NULL;
+		info->hcd	= NULL;
+
+		if (info->enable_oc != NULL)
+			(info->enable_oc)(info, 0);
+	}
+
+	clk_disable_unprepare(clk);
+	clk_disable_unprepare(usb_clk);
+}
+
+/* ohci_s3c2410_hub_status_data
+ *
+ * update the status data from the hub with anything that
+ * has been detected by our system
+*/
+
+static int
+ohci_s3c2410_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+	struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
+	struct s3c2410_hcd_port *port;
+	int orig;
+	int portno;
+
+	orig = ohci_hub_status_data(hcd, buf);
+
+	if (info == NULL)
+		return orig;
+
+	port = &info->port[0];
+
+	/* mark any changed port as changed */
+
+	for (portno = 0; portno < 2; port++, portno++) {
+		if (port->oc_changed == 1 &&
+		    port->flags & S3C_HCDFLG_USED) {
+			dev_dbg(hcd->self.controller,
+				"oc change on port %d\n", portno);
+
+			if (orig < 1)
+				orig = 1;
+
+			buf[0] |= 1<<(portno+1);
+		}
+	}
+
+	return orig;
+}
+
+/* s3c2410_usb_set_power
+ *
+ * configure the power on a port, by calling the platform device
+ * routine registered with the platform device
+*/
+
+static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
+				  int port, int to)
+{
+	if (info == NULL)
+		return;
+
+	if (info->power_control != NULL) {
+		info->port[port-1].power = to;
+		(info->power_control)(port-1, to);
+	}
+}
+
+/* ohci_s3c2410_hub_control
+ *
+ * look at control requests to the hub, and see if we need
+ * to take any action or over-ride the results from the
+ * request.
+*/
+
+static int ohci_s3c2410_hub_control(
+	struct usb_hcd	*hcd,
+	u16		typeReq,
+	u16		wValue,
+	u16		wIndex,
+	char		*buf,
+	u16		wLength)
+{
+	struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
+	struct usb_hub_descriptor *desc;
+	int ret = -EINVAL;
+	u32 *data = (u32 *)buf;
+
+	dev_dbg(hcd->self.controller,
+		"s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
+		hcd, typeReq, wValue, wIndex, buf, wLength);
+
+	/* if we are only an humble host without any special capabilities
+	 * process the request straight away and exit */
+
+	if (info == NULL) {
+		ret = ohci_hub_control(hcd, typeReq, wValue,
+				       wIndex, buf, wLength);
+		goto out;
+	}
+
+	/* check the request to see if it needs handling */
+
+	switch (typeReq) {
+	case SetPortFeature:
+		if (wValue == USB_PORT_FEAT_POWER) {
+			dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
+			s3c2410_usb_set_power(info, wIndex, 1);
+			goto out;
+		}
+		break;
+
+	case ClearPortFeature:
+		switch (wValue) {
+		case USB_PORT_FEAT_C_OVER_CURRENT:
+			dev_dbg(hcd->self.controller,
+				"ClearPortFeature: C_OVER_CURRENT\n");
+
+			if (valid_port(wIndex)) {
+				info->port[wIndex-1].oc_changed = 0;
+				info->port[wIndex-1].oc_status = 0;
+			}
+
+			goto out;
+
+		case USB_PORT_FEAT_OVER_CURRENT:
+			dev_dbg(hcd->self.controller,
+				"ClearPortFeature: OVER_CURRENT\n");
+
+			if (valid_port(wIndex))
+				info->port[wIndex-1].oc_status = 0;
+
+			goto out;
+
+		case USB_PORT_FEAT_POWER:
+			dev_dbg(hcd->self.controller,
+				"ClearPortFeature: POWER\n");
+
+			if (valid_port(wIndex)) {
+				s3c2410_usb_set_power(info, wIndex, 0);
+				return 0;
+			}
+		}
+		break;
+	}
+
+	ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
+	if (ret)
+		goto out;
+
+	switch (typeReq) {
+	case GetHubDescriptor:
+
+		/* update the hub's descriptor */
+
+		desc = (struct usb_hub_descriptor *)buf;
+
+		if (info->power_control == NULL)
+			return ret;
+
+		dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
+			desc->wHubCharacteristics);
+
+		/* remove the old configurations for power-switching, and
+		 * over-current protection, and insert our new configuration
+		 */
+
+		desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
+		desc->wHubCharacteristics |= cpu_to_le16(
+			HUB_CHAR_INDV_PORT_LPSM);
+
+		if (info->enable_oc) {
+			desc->wHubCharacteristics &= ~cpu_to_le16(
+				HUB_CHAR_OCPM);
+			desc->wHubCharacteristics |=  cpu_to_le16(
+				HUB_CHAR_INDV_PORT_OCPM);
+		}
+
+		dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
+			desc->wHubCharacteristics);
+
+		return ret;
+
+	case GetPortStatus:
+		/* check port status */
+
+		dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
+
+		if (valid_port(wIndex)) {
+			if (info->port[wIndex-1].oc_changed)
+				*data |= cpu_to_le32(RH_PS_OCIC);
+
+			if (info->port[wIndex-1].oc_status)
+				*data |= cpu_to_le32(RH_PS_POCI);
+		}
+	}
+
+ out:
+	return ret;
+}
+
+/* s3c2410_hcd_oc
+ *
+ * handle an over-current report
+*/
+
+static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
+{
+	struct s3c2410_hcd_port *port;
+	unsigned long flags;
+	int portno;
+
+	if (info == NULL)
+		return;
+
+	port = &info->port[0];
+
+	local_irq_save(flags);
+
+	for (portno = 0; portno < 2; port++, portno++) {
+		if (port_oc & (1<<portno) &&
+		    port->flags & S3C_HCDFLG_USED) {
+			port->oc_status = 1;
+			port->oc_changed = 1;
+
+			/* ok, once over-current is detected,
+			   the port needs to be powered down */
+			s3c2410_usb_set_power(info, portno+1, 0);
+		}
+	}
+
+	local_irq_restore(flags);
+}
+
+/* may be called without controller electrically present */
+/* may be called with controller, bus, and devices active */
+
+/*
+ * ohci_hcd_s3c2410_remove - shutdown processing for HCD
+ * @dev: USB Host Controller being removed
+ *
+ * Context: task context, might sleep
+ *
+ * Reverses the effect of ohci_hcd_3c2410_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_s3c2410_remove(struct platform_device *dev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+
+	usb_remove_hcd(hcd);
+	s3c2410_stop_hc(dev);
+	usb_put_hcd(hcd);
+	return 0;
+}
+
+/*
+ * ohci_hcd_s3c2410_probe - initialize S3C2410-based HCDs
+ * @dev: USB Host Controller to be probed
+ *
+ * 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_s3c2410_probe(struct platform_device *dev)
+{
+	struct usb_hcd *hcd = NULL;
+	struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
+	int retval, irq;
+
+	s3c2410_usb_set_power(info, 1, 1);
+	s3c2410_usb_set_power(info, 2, 1);
+
+	hcd = usb_create_hcd(&ohci_s3c2410_hc_driver, &dev->dev, "s3c24xx");
+	if (hcd == NULL)
+		return -ENOMEM;
+
+	hcd->rsrc_start = dev->resource[0].start;
+	hcd->rsrc_len	= resource_size(&dev->resource[0]);
+
+	hcd->regs = devm_ioremap_resource(&dev->dev, &dev->resource[0]);
+	if (IS_ERR(hcd->regs)) {
+		retval = PTR_ERR(hcd->regs);
+		goto err_put;
+	}
+
+	clk = devm_clk_get(&dev->dev, "usb-host");
+	if (IS_ERR(clk)) {
+		dev_err(&dev->dev, "cannot get usb-host clock\n");
+		retval = PTR_ERR(clk);
+		goto err_put;
+	}
+
+	usb_clk = devm_clk_get(&dev->dev, "usb-bus-host");
+	if (IS_ERR(usb_clk)) {
+		dev_err(&dev->dev, "cannot get usb-bus-host clock\n");
+		retval = PTR_ERR(usb_clk);
+		goto err_put;
+	}
+
+	irq = platform_get_irq(dev, 0);
+	if (irq < 0) {
+		retval = irq;
+		goto err_put;
+	}
+
+	s3c2410_start_hc(dev, hcd);
+
+	retval = usb_add_hcd(hcd, irq, 0);
+	if (retval != 0)
+		goto err_ioremap;
+
+	device_wakeup_enable(hcd->self.controller);
+	return 0;
+
+ err_ioremap:
+	s3c2410_stop_hc(dev);
+
+ err_put:
+	usb_put_hcd(hcd);
+	return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_PM
+static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct platform_device *pdev = to_platform_device(dev);
+	bool do_wakeup = device_may_wakeup(dev);
+	int rc = 0;
+
+	rc = ohci_suspend(hcd, do_wakeup);
+	if (rc)
+		return rc;
+
+	s3c2410_stop_hc(pdev);
+
+	return rc;
+}
+
+static int ohci_hcd_s3c2410_drv_resume(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct platform_device *pdev = to_platform_device(dev);
+
+	s3c2410_start_hc(pdev, hcd);
+
+	ohci_resume(hcd, false);
+
+	return 0;
+}
+#else
+#define ohci_hcd_s3c2410_drv_suspend	NULL
+#define ohci_hcd_s3c2410_drv_resume	NULL
+#endif
+
+static const struct dev_pm_ops ohci_hcd_s3c2410_pm_ops = {
+	.suspend	= ohci_hcd_s3c2410_drv_suspend,
+	.resume		= ohci_hcd_s3c2410_drv_resume,
+};
+
+static const struct of_device_id ohci_hcd_s3c2410_dt_ids[] = {
+	{ .compatible = "samsung,s3c2410-ohci" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, ohci_hcd_s3c2410_dt_ids);
+
+static struct platform_driver ohci_hcd_s3c2410_driver = {
+	.probe		= ohci_hcd_s3c2410_probe,
+	.remove		= ohci_hcd_s3c2410_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver		= {
+		.name	= "s3c2410-ohci",
+		.pm	= &ohci_hcd_s3c2410_pm_ops,
+		.of_match_table	= ohci_hcd_s3c2410_dt_ids,
+	},
+};
+
+static int __init ohci_s3c2410_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	ohci_init_driver(&ohci_s3c2410_hc_driver, NULL);
+
+	/*
+	 * The Samsung HW has some unusual quirks, which require
+	 * Sumsung-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.
+	 */
+
+	ohci_s3c2410_hc_driver.hub_status_data	= ohci_s3c2410_hub_status_data;
+	ohci_s3c2410_hc_driver.hub_control	= ohci_s3c2410_hub_control;
+
+	return platform_driver_register(&ohci_hcd_s3c2410_driver);
+}
+module_init(ohci_s3c2410_init);
+
+static void __exit ohci_s3c2410_cleanup(void)
+{
+	platform_driver_unregister(&ohci_hcd_s3c2410_driver);
+}
+module_exit(ohci_s3c2410_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s3c2410-ohci");