This patch adds USB OHCI driver for Samsung Exynos SoCs.
Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
---
drivers/usb/Kconfig | 1 +
drivers/usb/host/Kconfig | 6 +
drivers/usb/host/ohci-exynos.c | 274 ++++++++++++++++++++++++++++++++++++++++
drivers/usb/host/ohci-hcd.c | 5 +
4 files changed, 286 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/host/ohci-exynos.c
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 791f11b..75823a1 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -48,6 +48,7 @@ config USB_ARCH_HAS_OHCI
default y if ARCH_DAVINCI_DA8XX
default y if ARCH_CNS3XXX
default y if PLAT_SPEAR
+ default y if ARCH_EXYNOS
# PPC:
default y if STB03xxx
default y if PPC_MPC52xx
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 060e0e2..eea85dc 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -371,6 +371,12 @@ config USB_OHCI_SH
Enables support for the on-chip OHCI controller on the SuperH.
If you use the PCI OHCI controller, this option is not necessary.
+config USB_OHCI_EXYNOS
+ boolean "OHCI support for Samsung EXYNOS SoC Series"
+ depends on USB_OHCI_HCD && ARCH_EXYNOS
+ help
+ Enable support for the Samsung Exynos SOC's on-chip OHCI controller.
+
config USB_CNS3XXX_OHCI
bool "Cavium CNS3XXX OHCI Module"
depends on USB_OHCI_HCD && ARCH_CNS3XXX
diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
new file mode 100644
index 0000000..55aa35a
--- /dev/null
+++ b/drivers/usb/host/ohci-exynos.c
@@ -0,0 +1,274 @@
+/*
+ * SAMSUNG EXYNOS USB HOST OHCI Controller
+ *
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * Author: Jingoo Han <jg1.han@xxxxxxxxxxx>
+ *
+ * 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/ohci.h>
+#include <plat/usb-phy.h>
+
+struct exynos_ohci_hcd {
+ struct device *dev;
+ struct usb_hcd *hcd;
+ struct clk *clk;
+};
+
+static int ohci_exynos_start(struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ int ret;
+
+ ohci_dbg(ohci, "ohci_exynos_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 exynos_ohci_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "EXYNOS OHCI Host Controller",
+ .hcd_priv_size = sizeof(struct ohci_hcd),
+
+ .irq = ohci_irq,
+ .flags = HCD_MEMORY|HCD_USB11,
+
+ .start = ohci_exynos_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 __devinit exynos_ohci_probe(struct platform_device *pdev)
+{
+ struct exynos4_ohci_platdata *pdata;
+ struct exynos_ohci_hcd *exynos_ohci;
+ struct usb_hcd *hcd;
+ struct ohci_hcd *ohci;
+ 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;
+ }
+
+ exynos_ohci = kzalloc(sizeof(struct exynos_ohci_hcd), GFP_KERNEL);
+ if (!exynos_ohci)
+ return -ENOMEM;
+
+ exynos_ohci->dev = &pdev->dev;
+
+ hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
+ dev_name(&pdev->dev));
+ if (!hcd) {
+ dev_err(&pdev->dev, "Unable to create HCD\n");
+ err = -ENOMEM;
+ goto fail_hcd;
+ }
+
+ exynos_ohci->hcd = hcd;
+ exynos_ohci->clk = clk_get(&pdev->dev, "usbhost");
+
+ if (IS_ERR(exynos_ohci->clk)) {
+ dev_err(&pdev->dev, "Failed to get usbhost clock\n");
+ err = PTR_ERR(exynos_ohci->clk);
+ goto fail_clk;
+ }
+
+ err = clk_enable(exynos_ohci->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);
+
+ ohci = hcd_to_ohci(hcd);
+ ohci_hcd_init(ohci);
+
+ err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to add USB HCD\n");
+ goto fail;
+ }
+
+ platform_set_drvdata(pdev, exynos_ohci);
+
+ return 0;
+
+fail:
+ iounmap(hcd->regs);
+fail_io:
+ clk_disable(exynos_ohci->clk);
+fail_clken:
+ clk_put(exynos_ohci->clk);
+fail_clk:
+ usb_put_hcd(hcd);
+fail_hcd:
+ kfree(exynos_ohci);
+ return err;
+}
+
+static int __devexit exynos_ohci_remove(struct platform_device *pdev)
+{
+ struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
+ struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
+ struct usb_hcd *hcd = exynos_ohci->hcd;
+
+ usb_remove_hcd(hcd);
+
+ if (pdata && pdata->phy_exit)
+ pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+
+ iounmap(hcd->regs);
+
+ clk_disable(exynos_ohci->clk);
+ clk_put(exynos_ohci->clk);
+
+ usb_put_hcd(hcd);
+ kfree(exynos_ohci);
+
+ return 0;
+}
+
+static void exynos_ohci_shutdown(struct platform_device *pdev)
+{
+ struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
+ struct usb_hcd *hcd = exynos_ohci->hcd;
+
+ if (hcd->driver->shutdown)
+ hcd->driver->shutdown(hcd);
+}
+
+#ifdef CONFIG_PM
+static int exynos_ohci_suspend(struct device *dev)
+{
+ struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
+ struct usb_hcd *hcd = exynos_ohci->hcd;
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
+ unsigned long flags;
+ int rc = 0;
+
+ /*
+ * 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 && hcd->state != HC_STATE_HALT) {
+ rc = -EINVAL;
+ goto fail;
+ }
+
+ clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+ if (pdata && pdata->phy_exit)
+ pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+fail:
+ spin_unlock_irqrestore(&ohci->lock, flags);
+
+ return rc;
+}
+
+static int exynos_ohci_resume(struct device *dev)
+{
+ struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
+ struct usb_hcd *hcd = exynos_ohci->hcd;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
+
+ if (pdata && 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 0;
+}
+#else
+#define exynos_ohci_suspend NULL
+#define exynos_ohci_resume NULL
+#endif
+
+static const struct dev_pm_ops exynos_ohci_pm_ops = {
+ .suspend = exynos_ohci_suspend,
+ .resume = exynos_ohci_resume,
+};
+
+static struct platform_driver exynos_ohci_driver = {
+ .probe = exynos_ohci_probe,
+ .remove = __devexit_p(exynos_ohci_remove),
+ .shutdown = exynos_ohci_shutdown,
+ .driver = {
+ .name = "exynos-ohci",
+ .owner = THIS_MODULE,
+ .pm = &exynos_ohci_pm_ops,
+ }
+};
+
+MODULE_ALIAS("platform:exynos-ohci");
+MODULE_AUTHOR("Jingoo Han <jg1.han@xxxxxxxxxxx>");
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index b263919..a1006ff 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1005,6 +1005,11 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER ohci_hcd_s3c2410_driver
#endif
+#ifdef CONFIG_USB_OHCI_EXYNOS
+#include "ohci-exynos.c"
+#define PLATFORM_DRIVER exynos_ohci_driver
+#endif
+
#ifdef CONFIG_USB_OHCI_HCD_OMAP1
#include "ohci-omap.c"
#define OMAP1_PLATFORM_DRIVER ohci_hcd_omap_driver
--
1.7.1
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
