USB: Add initial S5P EHCI driver

This patch adds host USB high speed driver for samsung S5P series. This
is initial driver and we need additional implementation to support some
functions like power management.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 212 insertions, 0 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 5f518ded1955..ade009081feb 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -188,6 +188,12 @@ config USB_EHCI_SH
 	  Enables support for the on-chip EHCI controller on the SuperH.
 	  If you use the PCI EHCI controller, this option is not necessary.
 
+config USB_EHCI_S5P
+       boolean "S5P EHCI support"
+       depends on USB_EHCI_HCD && PLAT_S5P
+       help
+	 Enable support for the S5P SOC's on-chip EHCI controller.
+
 config USB_W90X900_EHCI
 	bool "W90X900(W90P910) EHCI support"
 	depends on USB_EHCI_HCD && ARCH_W90X900
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 78561d112c04..6b20b3b12d65 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1265,6 +1265,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER		tegra_ehci_driver
 #endif
 
+#ifdef CONFIG_USB_EHCI_S5P
+#include "ehci-s5p.c"
+#define PLATFORM_DRIVER		s5p_ehci_driver
+#endif
+
 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
     !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
     !defined(XILINX_OF_PLATFORM_DRIVER)
diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
new file mode 100644
index 000000000000..0c18f280bf4c
--- /dev/null
+++ b/drivers/usb/host/ehci-s5p.c
@@ -0,0 +1,201 @@
+/*
+ * SAMSUNG S5P USB HOST EHCI Controller
+ *
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * Author: Jingoo Han <jg1.han@samsung.com>
+ * Author: Joonyoung Shim <jy0922.shim@samsung.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <mach/regs-pmu.h>
+#include <plat/cpu.h>
+#include <plat/ehci.h>
+#include <plat/usb-phy.h>
+
+struct s5p_ehci_hcd {
+	struct device *dev;
+	struct usb_hcd *hcd;
+	struct clk *clk;
+};
+
+static const struct hc_driver s5p_ehci_hc_driver = {
+	.description		= hcd_name,
+	.product_desc		= "S5P EHCI Host Controller",
+	.hcd_priv_size		= sizeof(struct ehci_hcd),
+
+	.irq			= ehci_irq,
+	.flags			= HCD_MEMORY | HCD_USB2,
+
+	.reset			= ehci_init,
+	.start			= ehci_run,
+	.stop			= ehci_stop,
+	.shutdown		= ehci_shutdown,
+
+	.get_frame_number	= ehci_get_frame,
+
+	.urb_enqueue		= ehci_urb_enqueue,
+	.urb_dequeue		= ehci_urb_dequeue,
+	.endpoint_disable	= ehci_endpoint_disable,
+	.endpoint_reset		= ehci_endpoint_reset,
+
+	.hub_status_data	= ehci_hub_status_data,
+	.hub_control		= ehci_hub_control,
+	.bus_suspend		= ehci_bus_suspend,
+	.bus_resume		= ehci_bus_resume,
+
+	.relinquish_port	= ehci_relinquish_port,
+	.port_handed_over	= ehci_port_handed_over,
+
+	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
+};
+
+static int s5p_ehci_probe(struct platform_device *pdev)
+{
+	struct s5p_ehci_platdata *pdata;
+	struct s5p_ehci_hcd *s5p_ehci;
+	struct usb_hcd *hcd;
+	struct ehci_hcd *ehci;
+	struct resource *res;
+	int irq;
+	int err;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform data defined\n");
+		return -EINVAL;
+	}
+
+	s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL);
+	if (!s5p_ehci)
+		return -ENOMEM;
+
+	s5p_ehci->dev = &pdev->dev;
+
+	hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
+					dev_name(&pdev->dev));
+	if (!hcd) {
+		dev_err(&pdev->dev, "Unable to create HCD\n");
+		err = -ENOMEM;
+		goto fail_hcd;
+	}
+
+	s5p_ehci->clk = clk_get(&pdev->dev, "usbhost");
+
+	if (IS_ERR(s5p_ehci->clk)) {
+		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
+		err = PTR_ERR(s5p_ehci->clk);
+		goto fail_clk;
+	}
+
+	err = clk_enable(s5p_ehci->clk);
+	if (err)
+		goto fail_clken;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "Failed to get I/O memory\n");
+		err = -ENXIO;
+		goto fail_io;
+	}
+
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+	hcd->regs = ioremap(res->start, resource_size(res));
+	if (!hcd->regs) {
+		dev_err(&pdev->dev, "Failed to remap I/O memory\n");
+		err = -ENOMEM;
+		goto fail_io;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (!irq) {
+		dev_err(&pdev->dev, "Failed to get IRQ\n");
+		err = -ENODEV;
+		goto fail;
+	}
+
+	if (pdata->phy_init)
+		pdata->phy_init(pdev, S5P_USB_PHY_HOST);
+
+	ehci = hcd_to_ehci(hcd);
+	ehci->caps = hcd->regs;
+	ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
+
+	dbg_hcs_params(ehci, "reset");
+	dbg_hcc_params(ehci, "reset");
+
+	/* cache this readonly data; minimize chip reads */
+	ehci->hcs_params = readl(&ehci->caps->hcs_params);
+
+	err = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to add USB HCD\n");
+		goto fail;
+	}
+
+	platform_set_drvdata(pdev, s5p_ehci);
+
+	return 0;
+
+fail:
+	iounmap(hcd->regs);
+fail_io:
+	clk_disable(s5p_ehci->clk);
+fail_clken:
+	clk_put(s5p_ehci->clk);
+fail_clk:
+	usb_put_hcd(hcd);
+fail_hcd:
+	kfree(s5p_ehci);
+	return err;
+}
+
+static int s5p_ehci_remove(struct platform_device *pdev)
+{
+	struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
+	struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
+	struct usb_hcd *hcd = s5p_ehci->hcd;
+
+	usb_remove_hcd(hcd);
+
+	if (pdata && pdata->phy_exit)
+		pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+
+	iounmap(hcd->regs);
+
+	clk_disable(s5p_ehci->clk);
+	clk_put(s5p_ehci->clk);
+
+	usb_put_hcd(hcd);
+	kfree(s5p_ehci);
+
+	return 0;
+}
+
+static void s5p_ehci_shutdown(struct platform_device *pdev)
+{
+	struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
+	struct usb_hcd *hcd = s5p_ehci->hcd;
+
+	if (hcd->driver->shutdown)
+		hcd->driver->shutdown(hcd);
+}
+
+static struct platform_driver s5p_ehci_driver = {
+	.probe		= s5p_ehci_probe,
+	.remove		= s5p_ehci_remove,
+	.shutdown	= s5p_ehci_shutdown,
+	.driver = {
+		.name	= "s5p-ehci",
+		.owner	= THIS_MODULE,
+	}
+};
+
+MODULE_ALIAS("platform:s5p-ehci");