usb: ehci-hcd: Add support for SuperH EHCI.

This adds a trivial stub for supporting EHCI mode of the on-chip
SH USB host controllers.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

drivers/usb/Kconfig

@@ -66,6 +66,7 @@ config USB_ARCH_HAS_EHCI
 	default y if ARCH_AT91SAM9G45
 	default y if ARCH_MXC
 	default y if ARCH_OMAP3
+	default y if CPU_SUBTYPE_SH7786
 	default PCI
 
 # ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.

drivers/usb/host/ehci-hcd.c

@@ -1166,6 +1166,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER		ehci_mxc_driver
 #endif
 
+#ifdef CONFIG_CPU_SUBTYPE_SH7786
+#include "ehci-sh.c"
+#define PLATFORM_DRIVER		ehci_hcd_sh_driver
+#endif
+
 #ifdef CONFIG_SOC_AU1200
 #include "ehci-au1xxx.c"
 #define	PLATFORM_DRIVER		ehci_hcd_au1xxx_driver

drivers/usb/host/ehci-sh.c

@@ -0,0 +1,232 @@
+/*
+ * SuperH EHCI host controller driver
+ *
+ * Copyright (C) 2010  Paul Mundt
+ *
+ * Based on ohci-sh.c and ehci-atmel.c.
+ *
+ * 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 ehci_sh_priv {
+	struct clk *iclk, *fclk;
+	struct usb_hcd *hcd;
+};
+
+static int ehci_sh_reset(struct usb_hcd *hcd)
+{
+	struct ehci_hcd	*ehci = hcd_to_ehci(hcd);
+	int ret;
+
+	ehci->caps = hcd->regs;
+	ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci,
+		&ehci->caps->hc_capbase));
+
+	dbg_hcs_params(ehci, "reset");
+	dbg_hcc_params(ehci, "reset");
+
+	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+	ret = ehci_halt(ehci);
+	if (unlikely(ret))
+		return ret;
+
+	ret = ehci_init(hcd);
+	if (unlikely(ret))
+		return ret;
+
+	ehci->sbrn = 0x20;
+
+	ehci_reset(ehci);
+	ehci_port_power(ehci, 0);
+
+	return ret;
+}
+
+static const struct hc_driver ehci_sh_hc_driver = {
+	.description			= hcd_name,
+	.product_desc			= "SuperH EHCI",
+	.hcd_priv_size			= sizeof(struct ehci_hcd),
+
+	/*
+	 * generic hardware linkage
+	 */
+	.irq				= ehci_irq,
+	.flags				= HCD_USB2 | HCD_MEMORY,
+
+	/*
+	 * basic lifecycle operations
+	 */
+	.reset				= ehci_sh_reset,
+	.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,
+
+	/*
+	 * scheduling support
+	 */
+	.get_frame_number		= ehci_get_frame,
+
+	/*
+	 * root hub support
+	 */
+	.hub_status_data		= ehci_hub_status_data,
+	.hub_control			= ehci_hub_control,
+
+#ifdef CONFIG_PM
+	.bus_suspend			= ehci_bus_suspend,
+	.bus_resume			= ehci_bus_resume,
+#endif
+
+	.relinquish_port		= ehci_relinquish_port,
+	.port_handed_over		= ehci_port_handed_over,
+};
+
+static int ehci_hcd_sh_probe(struct platform_device *pdev)
+{
+	const struct hc_driver *driver = &ehci_sh_hc_driver;
+	struct resource *res;
+	struct ehci_sh_priv *priv;
+	struct usb_hcd *hcd;
+	int irq, ret;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev,
+			"Found HC with no register addr. Check %s setup!\n",
+			dev_name(&pdev->dev));
+		ret = -ENODEV;
+		goto fail_create_hcd;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(&pdev->dev,
+			"Found HC with no IRQ. Check %s setup!\n",
+			dev_name(&pdev->dev));
+		ret = -ENODEV;
+		goto fail_create_hcd;
+	}
+
+	/* initialize hcd */
+	hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
+			     dev_name(&pdev->dev));
+	if (!hcd) {
+		ret = -ENOMEM;
+		goto fail_create_hcd;
+	}
+
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+
+	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+				driver->description)) {
+		dev_dbg(&pdev->dev, "controller already in use\n");
+		ret = -EBUSY;
+		goto fail_request_resource;
+	}
+
+	hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
+	if (hcd->regs == NULL) {
+		dev_dbg(&pdev->dev, "error mapping memory\n");
+		ret = -ENXIO;
+		goto fail_ioremap;
+	}
+
+	priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL);
+	if (!priv) {
+		dev_dbg(&pdev->dev, "error allocating priv data\n");
+		ret = -ENOMEM;
+		goto fail_alloc;
+	}
+
+	/* These are optional, we don't care if they fail */
+	priv->fclk = clk_get(&pdev->dev, "usb_fck");
+	if (IS_ERR(priv->fclk))
+		priv->fclk = NULL;
+
+	priv->iclk = clk_get(&pdev->dev, "usb_ick");
+	if (IS_ERR(priv->iclk))
+		priv->iclk = NULL;
+
+	clk_enable(priv->fclk);
+	clk_enable(priv->iclk);
+
+	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "Failed to add hcd");
+		goto fail_add_hcd;
+	}
+
+	priv->hcd = hcd;
+	platform_set_drvdata(pdev, priv);
+
+	return ret;
+
+fail_add_hcd:
+	clk_disable(priv->iclk);
+	clk_disable(priv->fclk);
+
+	clk_put(priv->iclk);
+	clk_put(priv->fclk);
+
+	kfree(priv);
+fail_alloc:
+	iounmap(hcd->regs);
+fail_ioremap:
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+fail_request_resource:
+	usb_put_hcd(hcd);
+fail_create_hcd:
+	dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
+
+	return ret;
+}
+
+static int __exit ehci_hcd_sh_remove(struct platform_device *pdev)
+{
+	struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
+	struct usb_hcd *hcd = priv->hcd;
+
+	usb_remove_hcd(hcd);
+	iounmap(hcd->regs);
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+	usb_put_hcd(hcd);
+	platform_set_drvdata(pdev, NULL);
+
+	clk_disable(priv->fclk);
+	clk_disable(priv->iclk);
+
+	clk_put(priv->fclk);
+	clk_put(priv->iclk);
+
+	kfree(priv);
+
+	return 0;
+}
+
+static struct platform_driver ehci_hcd_sh_driver = {
+	.probe		= ehci_hcd_sh_probe,
+	.remove		= __exit_p(ehci_hcd_sh_remove),
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver		= {
+		.name	= "sh_ehci",
+		.owner	= THIS_MODULE,
+	},
+};
+
+MODULE_ALIAS("platform:sh_ehci");