[PATCH] USB: EHCI for AU1200

ALCHEMY:  Add EHCI support for AU1200

Updated by removing the OHCI support

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 297 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-au1xxx.c b/drivers/usb/host/ehci-au1xxx.c
new file mode 100644
index 000000000000..63eadeec1324
--- /dev/null
+++ b/drivers/usb/host/ehci-au1xxx.c
@@ -0,0 +1,297 @@
+/*
+ * EHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
+ *
+ * Bus Glue for AMD Alchemy Au1xxx
+ *
+ * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
+ *
+ * Modified for AMD Alchemy Au1200 EHC
+ *  by K.Boge <karsten.boge@amd.com>
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <linux/platform_device.h>
+#include <asm/mach-au1x00/au1000.h>
+
+#ifndef CONFIG_SOC_AU1200
+#error "this Alchemy chip doesn't have EHCI"
+#else                           /* Au1200 */
+
+#define USB_HOST_CONFIG   (USB_MSR_BASE + USB_MSR_MCFG)
+#define USB_MCFG_PFEN     (1<<31)
+#define USB_MCFG_RDCOMB   (1<<30)
+#define USB_MCFG_SSDEN    (1<<23)
+#define USB_MCFG_PHYPLLEN (1<<19)
+#define USB_MCFG_EHCCLKEN (1<<17)
+#define USB_MCFG_UCAM     (1<<7)
+#define USB_MCFG_EBMEN    (1<<3)
+#define USB_MCFG_EMEMEN   (1<<2)
+
+#define USBH_ENABLE_CE    (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
+
+#ifdef CONFIG_DMA_COHERENT
+#define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
+                         | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
+                         | USB_MCFG_SSDEN | USB_MCFG_UCAM \
+                         | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
+#else
+#define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
+                         | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
+                         | USB_MCFG_SSDEN \
+                         | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
+#endif
+#define USBH_DISABLE      (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
+
+#endif                          /* Au1200 */
+
+extern int usb_disabled(void);
+
+/*-------------------------------------------------------------------------*/
+
+static void au1xxx_start_ehc(struct platform_device *dev)
+{
+        pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
+
+        /* write HW defaults again in case Yamon cleared them */
+        if (au_readl(USB_HOST_CONFIG) == 0) {
+                au_writel(0x00d02000, USB_HOST_CONFIG);
+                au_readl(USB_HOST_CONFIG);
+                udelay(1000);
+        }
+        /* enable host controller */
+        au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
+        au_readl(USB_HOST_CONFIG);
+        udelay(1000);
+        au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG),
+                  USB_HOST_CONFIG);
+        au_readl(USB_HOST_CONFIG);
+        udelay(1000);
+
+        pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
+}
+
+static void au1xxx_stop_ehc(struct platform_device *dev)
+{
+        pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
+
+        /* Disable mem */
+        au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
+        udelay(1000);
+        /* Disable clock */
+        au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
+                  USB_HOST_CONFIG);
+        au_readl(USB_HOST_CONFIG);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* configure so an HC device and id are always provided */
+/* always called with process context; sleeping is OK */
+
+/**
+ * usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
+ * Context: !in_interrupt()
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ *
+ */
+int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
+                          struct usb_hcd **hcd_out, struct platform_device *dev)
+{
+        int retval;
+        struct usb_hcd *hcd;
+        struct ehci_hcd *ehci;
+
+#if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
+
+        /* Au1200 AB USB does not support coherent memory */
+        if (!(read_c0_prid() & 0xff)) {
+                pr_info("%s: this is chip revision AB!\n", dev->dev.name);
+                pr_info("%s: update your board or re-configure the kernel\n",
+                        dev->dev.name);
+                return -ENODEV;
+        }
+#endif
+
+        au1xxx_start_ehc(dev);
+
+        if (dev->resource[1].flags != IORESOURCE_IRQ) {
+                pr_debug("resource[1] is not IORESOURCE_IRQ");
+                retval = -ENOMEM;
+        }
+        hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx");
+        if (!hcd)
+                return -ENOMEM;
+        hcd->rsrc_start = dev->resource[0].start;
+        hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
+
+        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+                pr_debug("request_mem_region failed");
+                retval = -EBUSY;
+                goto err1;
+        }
+
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (!hcd->regs) {
+                pr_debug("ioremap failed");
+                retval = -ENOMEM;
+                goto err2;
+        }
+
+        ehci = hcd_to_ehci(hcd);
+        ehci->caps = hcd->regs;
+        ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
+        /* cache this readonly data; minimize chip reads */
+        ehci->hcs_params = readl(&ehci->caps->hcs_params);
+
+        /* ehci_hcd_init(hcd_to_ehci(hcd)); */
+
+        retval =
+            usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT | SA_SHIRQ);
+        if (retval == 0)
+                return retval;
+
+        au1xxx_stop_ehc(dev);
+        iounmap(hcd->regs);
+err2:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+        usb_put_hcd(hcd);
+        return retval;
+}
+
+/* may be called without controller electrically present */
+/* may be called with controller, bus, and devices active */
+
+/**
+ * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
+ * @dev: USB Host Controller being removed
+ * Context: !in_interrupt()
+ *
+ * Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking
+ * the HCD's stop() method.  It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ *
+ */
+void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
+{
+        usb_remove_hcd(hcd);
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+        usb_put_hcd(hcd);
+        au1xxx_stop_ehc(dev);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct hc_driver ehci_au1xxx_hc_driver = {
+        .description = hcd_name,
+        .product_desc = "Au1xxx EHCI",
+        .hcd_priv_size = sizeof(struct ehci_hcd),
+
+        /*
+         * generic hardware linkage
+         */
+        .irq = ehci_irq,
+        .flags = HCD_MEMORY | HCD_USB2,
+
+        /*
+         * basic lifecycle operations
+         */
+        .reset = ehci_init,
+        .start = ehci_run,
+        .stop = ehci_stop,
+
+        /*
+         * 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
+        .hub_suspend = ehci_hub_suspend,
+        .hub_resume = ehci_hub_resume,
+#endif
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int ehci_hcd_au1xxx_drv_probe(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct usb_hcd *hcd = NULL;
+        int ret;
+
+        pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
+        return ret;
+}
+
+static int ehci_hcd_au1xxx_drv_remove(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+        usb_ehci_au1xxx_remove(hcd, pdev);
+        return 0;
+}
+
+ /*TBD*/
+/*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+        return 0;
+}
+static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+        return 0;
+}
+*/
+static struct device_driver ehci_hcd_au1xxx_driver = {
+        .name = "au1xxx-ehci",
+        .bus = &platform_bus_type,
+        .probe = ehci_hcd_au1xxx_drv_probe,
+        .remove = ehci_hcd_au1xxx_drv_remove,
+        /*.suspend      = ehci_hcd_au1xxx_drv_suspend, */
+        /*.resume       = ehci_hcd_au1xxx_drv_resume, */
+};
+
+static int __init ehci_hcd_au1xxx_init(void)
+{
+        pr_debug(DRIVER_INFO " (Au1xxx)\n");
+
+        return driver_register(&ehci_hcd_au1xxx_driver);
+}
+
+static void __exit ehci_hcd_au1xxx_cleanup(void)
+{
+        driver_unregister(&ehci_hcd_au1xxx_driver);
+}
+
+module_init(ehci_hcd_au1xxx_init);
+module_exit(ehci_hcd_au1xxx_cleanup);