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>

1 files changed, 240 insertions, 0 deletions

diff --git a/drivers/usb/host/ohci-spear.c b/drivers/usb/host/ohci-spear.c
new file mode 100644
index 00000000000..4fd4bea9ac7
--- /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");