SAMSUNG: USB: Add support for S5P OHCI driver

This patch adds support for OHCI driver for samsung S5P series.

Signed-off-by: Bhuvana Kakunoori <bhuvana.kakunoori@linaro.org>
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>

4 files changed, 257 insertions, 0 deletions

diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 48f1781352f1..12c7ada927f8 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -42,6 +42,7 @@ config USB_ARCH_HAS_OHCI
 	default y if ARCH_DAVINCI_DA8XX
 	default y if ARCH_CNS3XXX
 	default y if PLAT_SPEAR
+	default y if PLAT_S5P
 	# PPC:
 	default y if STB03xxx
 	default y if PPC_MPC52xx
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index ab085f12d570..6d6ce0031ac9 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -578,3 +578,9 @@ config USB_OCTEON_OHCI
 config USB_OCTEON2_COMMON
 	bool
 	default y if USB_OCTEON_EHCI || USB_OCTEON_OHCI
+
+config USB_OHCI_S5P
+	boolean "S5P OHCI support"
+	depends on USB_OHCI_HCD && PLAT_S5P
+	help
+	  Enable support for the S5P SOC's on-chip OHCI controller.
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index f9cf3f04b742..f5a45459ff97 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1114,6 +1114,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER		ohci_hcd_ath79_driver
 #endif
 
+#ifdef CONFIG_ARCH_EXYNOS4
+#include "ohci-s5p.c"
+#define PLATFORM_DRIVER		ohci_hcd_s5pv210_driver
+#endif
+
 #if	!defined(PCI_DRIVER) &&		\
 	!defined(PLATFORM_DRIVER) &&	\
 	!defined(OMAP1_PLATFORM_DRIVER) &&	\
diff --git a/drivers/usb/host/ohci-s5p.c b/drivers/usb/host/ohci-s5p.c
new file mode 100644
index 000000000000..57c00d70de4a
--- /dev/null
+++ b/drivers/usb/host/ohci-s5p.c
@@ -0,0 +1,245 @@
+/* ohci-s5pv210.c - Driver for USB HOST on Samsung S5PV210 processor
+ *
+ * Bus Glue for SAMSUNG S5PV210 USB HOST OHCI Controller
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ * (C) Copyright 2002 Hewlett-Packard Company
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * Author: Jingoo Han <jg1.han@samsung.com>
+ *
+ * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
+ * Modified for SAMSUNG s5pv210 OHCI by Jingoo Han <jg1.han@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/platform_device.h>
+#include <plat/ohci.h>
+#include <plat/usb-phy.h>
+
+
+
+static int ohci_hcd_s5pv210_drv_probe(struct platform_device *pdev);
+static int ohci_hcd_s5pv210_drv_remove(struct platform_device *pdev);
+
+#ifdef CONFIG_PM
+static int ohci_hcd_s5pv210_drv_suspend(
+	struct platform_device *pdev,
+	pm_message_t message
+){
+	struct s5p_ohci_platdata *pdata;
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
+	unsigned long flags;
+	int rc = 0;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform data defined\n");
+		return -EINVAL;
+	}
+
+	/* Root hub was already suspended. Disable irq emission and
+	 * mark HW unaccessible, bail out if RH has been resumed. Use
+	 * the spinlock to properly synchronize with possible pending
+	 * RH suspend or resume activity.
+	 *
+	 * This is still racy as hcd->state is manipulated outside of
+	 * any locks =P But that will be a different fix.
+	 */
+	spin_lock_irqsave(&ohci->lock, flags);
+	if (hcd->state != HC_STATE_SUSPENDED) {
+		rc = -EINVAL;
+		goto bail;
+	}
+
+	/* make sure snapshot being resumed re-enumerates everything */
+	if (message.event == PM_EVENT_PRETHAW)
+		ohci_usb_reset(ohci);
+
+	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+	pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+bail:
+	spin_unlock_irqrestore(&ohci->lock, flags);
+
+	return rc;
+}
+static int ohci_hcd_s5pv210_drv_resume(struct platform_device *pdev)
+{
+	struct s5p_ohci_platdata *pdata;
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	int rc = 0;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform data defined\n");
+		return -EINVAL;
+	}
+
+	if (pdata->phy_init)
+		pdata->phy_init(pdev, S5P_USB_PHY_HOST);
+
+	/* Mark hardware accessible again as we are out of D3 state by now */
+	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+	ohci_finish_controller_resume(hcd);
+
+	return rc;
+}
+#else
+#define ohci_hcd_s5pv210_drv_suspend NULL
+#define ohci_hcd_s5pv210_drv_resume NULL
+#endif
+
+static int __devinit ohci_s5pv210_start(struct usb_hcd *hcd)
+{
+	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
+	int ret;
+
+	ohci_dbg(ohci, "ohci_s5pv210_start, ohci:%p", ohci);
+
+	ret = ohci_init(ohci);
+	if (ret < 0)
+		return ret;
+
+	ret = ohci_run(ohci);
+	if (ret < 0) {
+		err("can't start %s", hcd->self.bus_name);
+		ohci_stop(hcd);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct hc_driver ohci_s5pv210_hc_driver = {
+	.description		= hcd_name,
+	.product_desc		= "s5pv210 OHCI",
+	.hcd_priv_size		= sizeof(struct ohci_hcd),
+
+	.irq			= ohci_irq,
+	.flags			= HCD_MEMORY|HCD_USB11,
+
+	.start			= ohci_s5pv210_start,
+	.stop			= ohci_stop,
+	.shutdown		= ohci_shutdown,
+
+	.get_frame_number	= ohci_get_frame,
+
+	.urb_enqueue		= ohci_urb_enqueue,
+	.urb_dequeue		= ohci_urb_dequeue,
+	.endpoint_disable	= ohci_endpoint_disable,
+
+	.hub_status_data	= ohci_hub_status_data,
+	.hub_control		= ohci_hub_control,
+#ifdef	CONFIG_PM
+	.bus_suspend		= ohci_bus_suspend,
+	.bus_resume		= ohci_bus_resume,
+#endif
+	.start_port_reset	= ohci_start_port_reset,
+};
+
+static int ohci_hcd_s5pv210_drv_probe(struct platform_device *pdev)
+{
+	struct s5p_ohci_platdata *pdata;
+	struct usb_hcd  *hcd = NULL;
+	int retval = 0;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform data defined\n");
+		return -EINVAL;
+	}
+
+	if (pdev->resource[1].flags != IORESOURCE_IRQ) {
+		dev_err(&pdev->dev, "resource[1] is not IORESOURCE_IRQ.\n");
+		return -ENODEV;
+	}
+
+	hcd = usb_create_hcd(&ohci_s5pv210_hc_driver, &pdev->dev, "s5pv210");
+	if (!hcd) {
+		dev_err(&pdev->dev, "usb_create_hcd failed!\n");
+		return -ENODEV;
+	}
+
+	hcd->rsrc_start = pdev->resource[0].start;
+	hcd->rsrc_len = resource_size(&pdev->resource[0]);
+
+	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+		dev_err(&pdev->dev, "request_mem_region failed!\n");
+		retval = -EBUSY;
+		goto err1;
+	}
+
+	if (pdata->phy_init)
+		pdata->phy_init(pdev, S5P_USB_PHY_HOST);
+
+	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+	if (!hcd->regs) {
+		dev_err(&pdev->dev, "ioremap failed!\n");
+		retval = -ENOMEM;
+		goto err2;
+	}
+
+	ohci_hcd_init(hcd_to_ohci(hcd));
+
+	retval = usb_add_hcd(hcd, pdev->resource[1].start,
+				IRQF_DISABLED | IRQF_SHARED);
+
+	if (retval == 0) {
+		platform_set_drvdata(pdev, hcd);
+		return retval;
+	}
+
+	if (pdata && pdata->phy_exit)
+		pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+
+	iounmap(hcd->regs);
+err2:
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+	usb_put_hcd(hcd);
+	return retval;
+}
+
+static int ohci_hcd_s5pv210_drv_remove(struct platform_device *pdev)
+{
+	struct s5p_ohci_platdata *pdata;
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform data defined\n");
+		return -EINVAL;
+	}
+
+	usb_remove_hcd(hcd);
+	iounmap(hcd->regs);
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+	usb_put_hcd(hcd);
+	pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver  ohci_hcd_s5pv210_driver = {
+	.probe		= ohci_hcd_s5pv210_drv_probe,
+	.remove		= ohci_hcd_s5pv210_drv_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
+	.suspend	= ohci_hcd_s5pv210_drv_suspend,
+	.resume		= ohci_hcd_s5pv210_drv_resume,
+	.driver = {
+		.name = "s5p-ohci",
+		.owner = THIS_MODULE,
+	}
+};
+
+MODULE_ALIAS("platform:s5p-ohci");