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>

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index b5a7aa9..f005438 100644 (file)
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1009,6 +1009,11 @@ MODULE_LICENSE ("GPL");
 #define        PS3_SYSTEM_BUS_DRIVER   ps3_ehci_sb_driver
 #endif
 
+#ifdef CONFIG_440EPX
+#include "ehci-ppc-soc.c"
+#define        PLATFORM_DRIVER         ehci_ppc_soc_driver
+#endif
+
 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
     !defined(PS3_SYSTEM_BUS_DRIVER)
 #error "missing bus glue for ehci-hcd"

diff --git a/drivers/usb/host/ehci-ppc-soc.c b/drivers/usb/host/ehci-ppc-soc.c
new file mode 100644 (file)
index 0000000..c2cedb0
--- /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
+       }
+};