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/ehci-spear.c b/drivers/usb/host/ehci-spear.c
new file mode 100644
index 0000000..75c0087
--- /dev/null
+++ b/drivers/usb/host/ehci-spear.c
@@ -0,0 +1,212 @@
+/*
+* Driver for EHCI HCD on SPEAR SOC
+*
+* Copyright (C) 2010 ST Micro Electronics,
+* Deepak Sikri <deepak.sikri@st.com>
+*
+* Based on various ehci-*.c drivers
+*
+* This file is subject to the terms and conditions of the GNU General Public
+* License. See the file COPYING in the main directory of this archive for
+* more details.
+*/
+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+struct spear_ehci {
+ struct ehci_hcd ehci;
+ struct clk *clk;
+};
+
+#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd)
+
+static void spear_start_ehci(struct spear_ehci *ehci)
+{
+ clk_enable(ehci->clk);
+}
+
+static void spear_stop_ehci(struct spear_ehci *ehci)
+{
+ clk_disable(ehci->clk);
+}
+
+static int ehci_spear_setup(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int retval = 0;
+
+ /* registers start at offset 0x0 */
+ ehci->caps = hcd->regs;
+ ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci,
+ &ehci->caps->hc_capbase));
+ /* cache this readonly data; minimize chip reads */
+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+ retval = ehci_halt(ehci);
+ if (retval)
+ return retval;
+
+ retval = ehci_init(hcd);
+ if (retval)
+ return retval;
+
+ ehci_reset(ehci);
+ ehci_port_power(ehci, 0);
+
+ return retval;
+}
+
+static const struct hc_driver ehci_spear_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "SPEAr EHCI",
+ .hcd_priv_size = sizeof(struct spear_ehci),
+
+ /* generic hardware linkage */
+ .irq = ehci_irq,
+ .flags = HCD_MEMORY | HCD_USB2,
+
+ /* basic lifecycle operations */
+ .reset = ehci_spear_setup,
+ .start = ehci_run,
+ .stop = ehci_stop,
+ .shutdown = ehci_shutdown,
+
+ /* managing i/o requests and associated device resources */
+ .urb_enqueue = ehci_urb_enqueue,
+ .urb_dequeue = ehci_urb_dequeue,
+ .endpoint_disable = ehci_endpoint_disable,
+ .endpoint_reset = ehci_endpoint_reset,
+
+ /* scheduling support */
+ .get_frame_number = ehci_get_frame,
+
+ /* root hub support */
+ .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 spear_ehci_hcd_drv_probe(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd ;
+ struct spear_ehci *ehci;
+ struct resource *res;
+ struct clk *usbh_clk;
+ const struct hc_driver *driver = &ehci_spear_hc_driver;
+ int *pdata = pdev->dev.platform_data;
+ int irq, retval;
+ char clk_name[20] = "usbh_clk";
+
+ if (pdata == NULL)
+ return -EFAULT;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ 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 = res->start;
+ hcd->rsrc_len = resource_size(res);
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+ driver->description)) {
+ retval = -EBUSY;
+ goto fail_request_resource;
+ }
+
+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+ if (hcd->regs == NULL) {
+ dev_dbg(&pdev->dev, "error mapping memory\n");
+ retval = -ENOMEM;
+ goto fail_ioremap;
+ }
+
+ ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
+ ehci->clk = usbh_clk;
+
+ spear_start_ehci(ehci);
+ retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
+ if (retval)
+ goto fail_add_hcd;
+
+ return retval;
+
+fail_add_hcd:
+ spear_stop_ehci(ehci);
+ 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_ehci_hcd_drv_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct spear_ehci *ehci_p = to_spear_ehci(hcd);
+
+ if (!hcd)
+ return 0;
+ if (in_interrupt())
+ BUG();
+ usb_remove_hcd(hcd);
+
+ if (ehci_p->clk)
+ spear_stop_ehci(ehci_p);
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+
+ if (ehci_p->clk)
+ clk_put(ehci_p->clk);
+
+ return 0;
+}
+
+static struct platform_driver spear_ehci_hcd_driver = {
+ .probe = spear_ehci_hcd_drv_probe,
+ .remove = spear_ehci_hcd_drv_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+ .driver = {
+ .name = "spear-ehci",
+ .bus = &platform_bus_type
+ }
+};
+
+MODULE_ALIAS("platform:spear-ehci");