USB: EHCI big endian data structures support (for 440EPx)

This patch adds support for the AMCC 440EPx EHCI controller whose
in-memory data structures and the registers are represented in big-
endian format.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 182 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-ppc-soc.c b/drivers/usb/host/ehci-ppc-soc.c
new file mode 100644
index 000000000000..c2cedb09ed8b
--- /dev/null
+++ b/drivers/usb/host/ehci-ppc-soc.c
@@ -0,0 +1,182 @@
+/*
+ * EHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 2006-2007 Stefan Roese <sr@denx.de>, DENX Software Engineering
+ *
+ * Bus Glue for PPC On-Chip EHCI driver
+ * Tested on AMCC 440EPx
+ *
+ * Based on "ehci-au12xx.c" by David Brownell <dbrownell@users.sourceforge.net>
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <linux/platform_device.h>
+
+extern int usb_disabled(void);
+
+/**
+ * usb_ehci_ppc_soc_probe - initialize PPC-SoC-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_ppc_soc_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 (dev->resource[1].flags != IORESOURCE_IRQ) {
+                pr_debug("resource[1] is not IORESOURCE_IRQ");
+                retval = -ENOMEM;
+        }
+        hcd = usb_create_hcd(driver, &dev->dev, "PPC-SOC EHCI");
+        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->big_endian_mmio = 1;
+        ehci->big_endian_desc = 1;
+        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);
+
+#if defined(CONFIG_440EPX)
+        /*
+         * 440EPx Errata USBH_3
+         * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
+         */
+        out_be32((void *)((ulong)(&ehci->regs->command) + 0x8c), (1 << 0));
+        ehci_dbg(ehci, "Break Memory Transfer (BMT) has beed enabled!\n");
+#endif
+
+        retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED);
+        if (retval == 0)
+                return retval;
+
+        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_ppc_soc_remove - shutdown processing for PPC-SoC-based HCDs
+ * @dev: USB Host Controller being removed
+ * Context: !in_interrupt()
+ *
+ * Reverses the effect of usb_ehci_hcd_ppc_soc_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_ppc_soc_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);
+}
+
+static const struct hc_driver ehci_ppc_soc_hc_driver = {
+        .description = hcd_name,
+        .product_desc = "PPC-SOC 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,
+        .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
+        .hub_suspend = ehci_hub_suspend,
+        .hub_resume = ehci_hub_resume,
+#endif
+};
+
+static int ehci_hcd_ppc_soc_drv_probe(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = NULL;
+        int ret;
+
+        pr_debug("In ehci_hcd_ppc_soc_drv_probe\n");
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        ret = usb_ehci_ppc_soc_probe(&ehci_ppc_soc_hc_driver, &hcd, pdev);
+        return ret;
+}
+
+static int ehci_hcd_ppc_soc_drv_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+        usb_ehci_ppc_soc_remove(hcd, pdev);
+        return 0;
+}
+
+MODULE_ALIAS("ppc-soc-ehci");
+static struct platform_driver ehci_ppc_soc_driver = {
+        .probe = ehci_hcd_ppc_soc_drv_probe,
+        .remove = ehci_hcd_ppc_soc_drv_remove,
+        .shutdown = usb_hcd_platform_shutdown,
+        .driver = {
+                .name = "ppc-soc-ehci",
+                .bus = &platform_bus_type
+        }
+};