USB host: Adding USB ehci & ohci support for spear platform
This patch adds support for ehci and ohci controller in the SPEAr platform.
Changes since V2:
added clear_tt_buffer_complete in ehci_spear_hc_driver
Signed-off-by: Deepak Sikri <deepak.sikri@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ohci-spear.c b/drivers/usb/host/ohci-spear.c
new file mode 100644
index 0000000..4fd4bea
--- /dev/null
+++ b/drivers/usb/host/ohci-spear.c
@@ -0,0 +1,240 @@
+/*
+* OHCI HCD (Host Controller Driver) for USB.
+*
+* Copyright (C) 2010 ST Microelectronics.
+* Deepak Sikri<deepak.sikri@st.com>
+*
+* Based on various ohci-*.c drivers
+*
+* This file is licensed under the terms of the GNU General Public
+* License version 2. This program is licensed "as is" without any
+* warranty of any kind, whether express or implied.
+*/
+
+#include <linux/signal.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+struct spear_ohci {
+ struct ohci_hcd ohci;
+ struct clk *clk;
+};
+
+#define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd)
+
+static void spear_start_ohci(struct spear_ohci *ohci)
+{
+ clk_enable(ohci->clk);
+}
+
+static void spear_stop_ohci(struct spear_ohci *ohci)
+{
+ clk_disable(ohci->clk);
+}
+
+static int __devinit ohci_spear_start(struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ int ret;
+
+ ret = ohci_init(ohci);
+ if (ret < 0)
+ return ret;
+ ohci->regs = hcd->regs;
+
+ ret = ohci_run(ohci);
+ if (ret < 0) {
+ dev_err(hcd->self.controller, "can't start\n");
+ ohci_stop(hcd);
+ return ret;
+ }
+
+ create_debug_files(ohci);
+
+#ifdef DEBUG
+ ohci_dump(ohci, 1);
+#endif
+ return 0;
+}
+
+static const struct hc_driver ohci_spear_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "SPEAr OHCI",
+ .hcd_priv_size = sizeof(struct spear_ohci),
+
+ /* generic hardware linkage */
+ .irq = ohci_irq,
+ .flags = HCD_USB11 | HCD_MEMORY,
+
+ /* basic lifecycle operations */
+ .start = ohci_spear_start,
+ .stop = ohci_stop,
+ .shutdown = ohci_shutdown,
+#ifdef CONFIG_PM
+ .bus_suspend = ohci_bus_suspend,
+ .bus_resume = ohci_bus_resume,
+#endif
+
+ /* managing i/o requests and associated device resources */
+ .urb_enqueue = ohci_urb_enqueue,
+ .urb_dequeue = ohci_urb_dequeue,
+ .endpoint_disable = ohci_endpoint_disable,
+
+ /* scheduling support */
+ .get_frame_number = ohci_get_frame,
+
+ /* root hub support */
+ .hub_status_data = ohci_hub_status_data,
+ .hub_control = ohci_hub_control,
+
+ .start_port_reset = ohci_start_port_reset,
+};
+
+static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
+{
+ const struct hc_driver *driver = &ohci_spear_hc_driver;
+ struct usb_hcd *hcd = NULL;
+ struct clk *usbh_clk;
+ struct spear_ohci *ohci_p;
+ struct resource *res;
+ int retval, irq;
+ int *pdata = pdev->dev.platform_data;
+ char clk_name[20] = "usbh_clk";
+
+ if (pdata == NULL)
+ return -EFAULT;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ retval = irq;
+ goto fail_irq_get;
+ }
+
+ if (*pdata >= 0)
+ sprintf(clk_name, "usbh.%01d_clk", *pdata);
+
+ usbh_clk = clk_get(NULL, clk_name);
+ if (IS_ERR(usbh_clk)) {
+ dev_err(&pdev->dev, "Error getting interface clock\n");
+ retval = PTR_ERR(usbh_clk);
+ goto fail_get_usbh_clk;
+ }
+
+ hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+ if (!hcd) {
+ retval = -ENOMEM;
+ goto fail_create_hcd;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ retval = -ENODEV;
+ goto fail_request_resource;
+ }
+
+ hcd->rsrc_start = pdev->resource[0].start;
+ hcd->rsrc_len = resource_size(res);
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+ dev_dbg(&pdev->dev, "request_mem_region failed\n");
+ retval = -EBUSY;
+ goto fail_request_resource;
+ }
+
+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+ if (!hcd->regs) {
+ dev_dbg(&pdev->dev, "ioremap failed\n");
+ retval = -ENOMEM;
+ goto fail_ioremap;
+ }
+
+ ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd);
+ ohci_p->clk = usbh_clk;
+ spear_start_ohci(ohci_p);
+ ohci_hcd_init(hcd_to_ohci(hcd));
+
+ retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), IRQF_DISABLED);
+ if (retval == 0)
+ return retval;
+
+ spear_stop_ohci(ohci_p);
+ iounmap(hcd->regs);
+fail_ioremap:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+fail_request_resource:
+ usb_put_hcd(hcd);
+fail_create_hcd:
+ clk_put(usbh_clk);
+fail_get_usbh_clk:
+fail_irq_get:
+ dev_err(&pdev->dev, "init fail, %d\n", retval);
+
+ return retval;
+}
+
+static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+
+ usb_remove_hcd(hcd);
+ if (ohci_p->clk)
+ spear_stop_ohci(ohci_p);
+
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+
+ if (ohci_p->clk)
+ clk_put(ohci_p->clk);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+#if defined(CONFIG_PM)
+static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
+ pm_message_t message)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ spear_stop_ohci(ohci_p);
+ ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
+ return 0;
+}
+
+static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ spear_start_ohci(ohci_p);
+ ohci_finish_controller_resume(hcd);
+ return 0;
+}
+#endif
+
+/* Driver definition to register with the platform bus */
+static struct platform_driver spear_ohci_hcd_driver = {
+ .probe = spear_ohci_hcd_drv_probe,
+ .remove = spear_ohci_hcd_drv_remove,
+#ifdef CONFIG_PM
+ .suspend = spear_ohci_hcd_drv_suspend,
+ .resume = spear_ohci_hcd_drv_resume,
+#endif
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "spear-ohci",
+ },
+};
+
+MODULE_ALIAS("platform:spear-ohci");