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path: root/drivers/usb/host/ehci-ppc-soc.c
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Diffstat (limited to 'drivers/usb/host/ehci-ppc-soc.c')
-rw-r--r--drivers/usb/host/ehci-ppc-soc.c182
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 00000000000..c2cedb09ed8
--- /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
+ }
+};