1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-sa1111.c b/drivers/usb/host/ohci-sa1111.c
new file mode 100644
index 0000000000..aca0338a29
--- /dev/null
+++ b/drivers/usb/host/ohci-sa1111.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: GPL-1.0+
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ * (C) Copyright 2002 Hewlett-Packard Company
+ *
+ * SA1111 Bus Glue
+ *
+ * Written by Christopher Hoover <ch@hpl.hp.com>
+ * Based on fragments of previous driver by Russell King et al.
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <asm/mach-types.h>
+#include <asm/hardware/sa1111.h>
+
+#ifndef CONFIG_SA1111
+#error "This file is SA-1111 bus glue.  CONFIG_SA1111 must be defined."
+#endif
+
+#define USB_STATUS	0x0118
+#define USB_RESET	0x011c
+#define USB_IRQTEST	0x0120
+
+#define USB_RESET_FORCEIFRESET	(1 << 0)
+#define USB_RESET_FORCEHCRESET	(1 << 1)
+#define USB_RESET_CLKGENRESET	(1 << 2)
+#define USB_RESET_SIMSCALEDOWN	(1 << 3)
+#define USB_RESET_USBINTTEST	(1 << 4)
+#define USB_RESET_SLEEPSTBYEN	(1 << 5)
+#define USB_RESET_PWRSENSELOW	(1 << 6)
+#define USB_RESET_PWRCTRLLOW	(1 << 7)
+
+#define USB_STATUS_IRQHCIRMTWKUP  (1 <<  7)
+#define USB_STATUS_IRQHCIBUFFACC  (1 <<  8)
+#define USB_STATUS_NIRQHCIM       (1 <<  9)
+#define USB_STATUS_NHCIMFCLR      (1 << 10)
+#define USB_STATUS_USBPWRSENSE    (1 << 11)
+
+#if 0
+static void dump_hci_status(struct usb_hcd *hcd, const char *label)
+{
+	unsigned long status = readl_relaxed(hcd->regs + USB_STATUS);
+
+	printk(KERN_DEBUG "%s USB_STATUS = { %s%s%s%s%s}\n", label,
+	     ((status & USB_STATUS_IRQHCIRMTWKUP) ? "IRQHCIRMTWKUP " : ""),
+	     ((status & USB_STATUS_IRQHCIBUFFACC) ? "IRQHCIBUFFACC " : ""),
+	     ((status & USB_STATUS_NIRQHCIM) ? "" : "IRQHCIM "),
+	     ((status & USB_STATUS_NHCIMFCLR) ? "" : "HCIMFCLR "),
+	     ((status & USB_STATUS_USBPWRSENSE) ? "USBPWRSENSE " : ""));
+}
+#endif
+
+static int ohci_sa1111_reset(struct usb_hcd *hcd)
+{
+	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+
+	ohci_hcd_init(ohci);
+	return ohci_init(ohci);
+}
+
+static int ohci_sa1111_start(struct usb_hcd *hcd)
+{
+	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
+	int ret;
+
+	ret = ohci_run(ohci);
+	if (ret < 0) {
+		ohci_err(ohci, "can't start\n");
+		ohci_stop(hcd);
+	}
+	return ret;
+}
+
+static const struct hc_driver ohci_sa1111_hc_driver = {
+	.description =		hcd_name,
+	.product_desc =		"SA-1111 OHCI",
+	.hcd_priv_size =	sizeof(struct ohci_hcd),
+
+	/*
+	 * generic hardware linkage
+	 */
+	.irq =			ohci_irq,
+	.flags =		HCD_USB11 | HCD_DMA | HCD_MEMORY,
+
+	/*
+	 * basic lifecycle operations
+	 */
+	.reset =		ohci_sa1111_reset,
+	.start =		ohci_sa1111_start,
+	.stop =			ohci_stop,
+	.shutdown =		ohci_shutdown,
+
+	/*
+	 * managing i/o requests and associated device resources
+	 */
+	.urb_enqueue =		ohci_urb_enqueue,
+	.urb_dequeue =		ohci_urb_dequeue,
+	.endpoint_disable =	ohci_endpoint_disable,
+
+	/*
+	 * scheduling support
+	 */
+	.get_frame_number =	ohci_get_frame,
+
+	/*
+	 * root hub support
+	 */
+	.hub_status_data =	ohci_hub_status_data,
+	.hub_control =		ohci_hub_control,
+#ifdef	CONFIG_PM
+	.bus_suspend =		ohci_bus_suspend,
+	.bus_resume =		ohci_bus_resume,
+#endif
+	.start_port_reset =	ohci_start_port_reset,
+};
+
+static int sa1111_start_hc(struct sa1111_dev *dev)
+{
+	unsigned int usb_rst = 0;
+	int ret;
+
+	dev_dbg(&dev->dev, "starting SA-1111 OHCI USB Controller\n");
+
+	if (machine_is_assabet())
+		usb_rst = USB_RESET_PWRSENSELOW | USB_RESET_PWRCTRLLOW;
+
+	/*
+	 * Configure the power sense and control lines.  Place the USB
+	 * host controller in reset.
+	 */
+	writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
+		      dev->mapbase + USB_RESET);
+
+	/*
+	 * Now, carefully enable the USB clock, and take
+	 * the USB host controller out of reset.
+	 */
+	ret = sa1111_enable_device(dev);
+	if (ret == 0) {
+		udelay(11);
+		writel_relaxed(usb_rst, dev->mapbase + USB_RESET);
+	}
+
+	return ret;
+}
+
+static void sa1111_stop_hc(struct sa1111_dev *dev)
+{
+	unsigned int usb_rst;
+
+	dev_dbg(&dev->dev, "stopping SA-1111 OHCI USB Controller\n");
+
+	/*
+	 * Put the USB host controller into reset.
+	 */
+	usb_rst = readl_relaxed(dev->mapbase + USB_RESET);
+	writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
+		      dev->mapbase + USB_RESET);
+
+	/*
+	 * Stop the USB clock.
+	 */
+	sa1111_disable_device(dev);
+}
+
+/**
+ * ohci_hcd_sa1111_probe - initialize SA-1111-based HCDs
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it.
+ */
+static int ohci_hcd_sa1111_probe(struct sa1111_dev *dev)
+{
+	struct usb_hcd *hcd;
+	int ret, irq;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	/*
+	 * We don't call dma_set_mask_and_coherent() here because the
+	 * DMA mask has already been appropraitely setup by the core
+	 * SA-1111 bus code (which includes bug workarounds.)
+	 */
+
+	hcd = usb_create_hcd(&ohci_sa1111_hc_driver, &dev->dev, "sa1111");
+	if (!hcd)
+		return -ENOMEM;
+
+	hcd->rsrc_start = dev->res.start;
+	hcd->rsrc_len = resource_size(&dev->res);
+
+	irq = sa1111_get_irq(dev, 1);
+	if (irq <= 0) {
+		ret = irq ? : -ENXIO;
+		goto err1;
+	}
+
+	/*
+	 * According to the "Intel StrongARM SA-1111 Microprocessor Companion
+	 * Chip Specification Update" (June 2000), erratum #7, there is a
+	 * significant bug in the SA1111 SDRAM shared memory controller.  If
+	 * an access to a region of memory above 1MB relative to the bank base,
+	 * it is important that address bit 10 _NOT_ be asserted. Depending
+	 * on the configuration of the RAM, bit 10 may correspond to one
+	 * of several different (processor-relative) address bits.
+	 *
+	 * Section 4.6 of the "Intel StrongARM SA-1111 Development Module
+	 * User's Guide" mentions that jumpers R51 and R52 control the
+	 * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or
+	 * SDRAM bank 1 on Neponset). The default configuration selects
+	 * Assabet, so any address in bank 1 is necessarily invalid.
+	 *
+	 * As a workaround, use a bounce buffer in addressable memory
+	 * as local_mem, relying on ZONE_DMA to provide an area that
+	 * fits within the above constraints.
+	 *
+	 * SZ_64K is an estimate for what size this might need.
+	 */
+	ret = usb_hcd_setup_local_mem(hcd, 0, 0, SZ_64K);
+	if (ret)
+		goto err1;
+
+	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+		dev_dbg(&dev->dev, "request_mem_region failed\n");
+		ret = -EBUSY;
+		goto err1;
+	}
+
+	hcd->regs = dev->mapbase;
+
+	ret = sa1111_start_hc(dev);
+	if (ret)
+		goto err2;
+
+	ret = usb_add_hcd(hcd, irq, 0);
+	if (ret == 0) {
+		device_wakeup_enable(hcd->self.controller);
+		return ret;
+	}
+
+	sa1111_stop_hc(dev);
+ err2:
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ err1:
+	usb_put_hcd(hcd);
+	return ret;
+}
+
+/**
+ * ohci_hcd_sa1111_remove - shutdown processing for SA-1111-based HCDs
+ * @dev: USB Host Controller being removed
+ *
+ * Reverses the effect of ohci_hcd_sa1111_probe(), first invoking
+ * the HCD's stop() method.
+ */
+static void ohci_hcd_sa1111_remove(struct sa1111_dev *dev)
+{
+	struct usb_hcd *hcd = sa1111_get_drvdata(dev);
+
+	usb_remove_hcd(hcd);
+	sa1111_stop_hc(dev);
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+	usb_put_hcd(hcd);
+}
+
+static void ohci_hcd_sa1111_shutdown(struct device *_dev)
+{
+	struct sa1111_dev *dev = to_sa1111_device(_dev);
+	struct usb_hcd *hcd = sa1111_get_drvdata(dev);
+
+	if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+		hcd->driver->shutdown(hcd);
+		sa1111_stop_hc(dev);
+	}
+}
+
+static struct sa1111_driver ohci_hcd_sa1111_driver = {
+	.drv = {
+		.name	= "sa1111-ohci",
+		.owner	= THIS_MODULE,
+		.shutdown = ohci_hcd_sa1111_shutdown,
+	},
+	.devid		= SA1111_DEVID_USB,
+	.probe		= ohci_hcd_sa1111_probe,
+	.remove		= ohci_hcd_sa1111_remove,
+};