[PATCH] USB: add support for OCHI on AT91rm9200
This adds support for OHCI on AT91rm9200 based boards.
Possibly of interest here is the way this uses <linux/clk.h> to
gate clocks on/off during system pm state transitions. That's
typical for non-PCI systems. Some can go further; Mini-A host
side connectors enable ID-pin sensing.
From: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
new file mode 100644
index 0000000..980030d6
--- /dev/null
+++ b/drivers/usb/host/ohci-at91.c
@@ -0,0 +1,306 @@
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * Copyright (C) 2004 SAN People (Pty) Ltd.
+ * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
+ *
+ * AT91RM9200 Bus Glue
+ *
+ * Based on fragments of 2.4 driver by Rick Bronson.
+ * Based on ohci-omap.c
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-types.h>
+#include <asm/hardware.h>
+#include <asm/arch/board.h>
+
+#ifndef CONFIG_ARCH_AT91RM9200
+#error "This file is AT91RM9200 bus glue. CONFIG_ARCH_AT91RM9200 must be defined."
+#endif
+
+/* interface and function clocks */
+static struct clk *iclk, *fclk;
+
+extern int usb_disabled(void);
+
+/*-------------------------------------------------------------------------*/
+
+static void at91_start_hc(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_regs __iomem *regs = hcd->regs;
+
+ dev_dbg(&pdev->dev, "starting AT91RM9200 OHCI USB Controller\n");
+
+ /*
+ * Start the USB clocks.
+ */
+ clk_enable(iclk);
+ clk_enable(fclk);
+
+ /*
+ * The USB host controller must remain in reset.
+ */
+ writel(0, ®s->control);
+}
+
+static void at91_stop_hc(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_regs __iomem *regs = hcd->regs;
+
+ dev_dbg(&pdev->dev, "stopping AT91RM9200 OHCI USB Controller\n");
+
+ /*
+ * Put the USB host controller into reset.
+ */
+ writel(0, ®s->control);
+
+ /*
+ * Stop the USB clocks.
+ */
+ clk_disable(fclk);
+ clk_disable(iclk);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static int usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
+
+/* configure so an HC device and id are always provided */
+/* always called with process context; sleeping is OK */
+
+
+/**
+ * usb_hcd_at91_probe - initialize AT91RM9200-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.
+ *
+ * Store this function in the HCD's struct pci_driver as probe().
+ */
+int usb_hcd_at91_probe (const struct hc_driver *driver, struct platform_device *pdev)
+{
+ int retval;
+ struct usb_hcd *hcd = NULL;
+
+ if (pdev->num_resources != 2) {
+ pr_debug("hcd probe: invalid num_resources");
+ return -ENODEV;
+ }
+
+ if ((pdev->resource[0].flags != IORESOURCE_MEM) || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
+ pr_debug("hcd probe: invalid resource type\n");
+ return -ENODEV;
+ }
+
+ hcd = usb_create_hcd(driver, &pdev->dev, "at91rm9200");
+ if (!hcd)
+ return -ENOMEM;
+ hcd->rsrc_start = pdev->resource[0].start;
+ hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
+
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+ pr_debug("request_mem_region failed\n");
+ retval = -EBUSY;
+ goto err1;
+ }
+
+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+ if (!hcd->regs) {
+ pr_debug("ioremap failed\n");
+ retval = -EIO;
+ goto err2;
+ }
+
+ iclk = clk_get(&pdev->dev, "ohci_clk");
+ fclk = clk_get(&pdev->dev, "uhpck");
+
+ at91_start_hc(pdev);
+ ohci_hcd_init(hcd_to_ohci(hcd));
+
+ retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT);
+ if (retval == 0)
+ return retval;
+
+ /* Error handling */
+ at91_stop_hc(pdev);
+
+ clk_put(fclk);
+ clk_put(iclk);
+
+ 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_hcd_at91_remove - shutdown processing for AT91RM9200-based HCDs
+ * @dev: USB Host Controller being removed
+ * Context: !in_interrupt()
+ *
+ * Reverses the effect of usb_hcd_at91_probe(), first invoking
+ * the HCD's stop() method. It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ *
+ */
+static int usb_hcd_at91_remove (struct usb_hcd *hcd, struct platform_device *pdev)
+{
+ usb_remove_hcd(hcd);
+ at91_stop_hc(pdev);
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+
+ clk_put(fclk);
+ clk_put(iclk);
+ fclk = iclk = NULL;
+
+ dev_set_drvdata(&pdev->dev, NULL);
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int __devinit
+ohci_at91_start (struct usb_hcd *hcd)
+{
+// struct at91_ohci_data *board = hcd->self.controller->platform_data;
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ int ret;
+
+ if ((ret = ohci_init(ohci)) < 0)
+ return ret;
+
+ if ((ret = ohci_run(ohci)) < 0) {
+ err("can't start %s", hcd->self.bus_name);
+ ohci_stop(hcd);
+ return ret;
+ }
+// hcd->self.root_hub->maxchild = board->ports;
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct hc_driver ohci_at91_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "AT91RM9200 OHCI",
+ .hcd_priv_size = sizeof(struct ohci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = ohci_irq,
+ .flags = HCD_USB11 | HCD_MEMORY,
+
+ /*
+ * basic lifecycle operations
+ */
+ .start = ohci_at91_start,
+ .stop = ohci_stop,
+
+ /*
+ * 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
+ .hub_suspend = ohci_hub_suspend,
+ .hub_resume = ohci_hub_resume,
+#endif
+ .start_port_reset = ohci_start_port_reset,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int ohci_hcd_at91_drv_probe(struct platform_device *dev)
+{
+ return usb_hcd_at91_probe(&ohci_at91_hc_driver, dev);
+}
+
+static int ohci_hcd_at91_drv_remove(struct platform_device *dev)
+{
+ return usb_hcd_at91_remove(platform_get_drvdata(dev), dev);
+}
+
+#ifdef CONFIG_PM
+static int ohci_hcd_at91_drv_suspend(struct platform_device *dev, u32 state, u32 level)
+{
+ printk("%s(%s:%d): not implemented yet\n",
+ __func__, __FILE__, __LINE__);
+
+ clk_disable(fclk);
+
+ return 0;
+}
+
+static int ohci_hcd_at91_drv_resume(struct platform_device *dev, u32 state)
+{
+ printk("%s(%s:%d): not implemented yet\n",
+ __func__, __FILE__, __LINE__);
+
+ clk_enable(fclk);
+
+ return 0;
+}
+#else
+#define ohci_hcd_at91_drv_suspend NULL
+#define ohci_hcd_at91_drv_resume NULL
+#endif
+
+static struct platform_driver ohci_hcd_at91_driver = {
+ .probe = ohci_hcd_at91_drv_probe,
+ .remove = ohci_hcd_at91_drv_remove,
+ .suspend = ohci_hcd_at91_drv_suspend,
+ .resume = ohci_hcd_at91_drv_resume,
+ .driver = {
+ .name = "at91rm9200-ohci",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init ohci_hcd_at91_init (void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ return platform_driver_register(&ohci_hcd_at91_driver);
+}
+
+static void __exit ohci_hcd_at91_cleanup (void)
+{
+ platform_driver_unregister(&ohci_hcd_at91_driver);
+}
+
+module_init (ohci_hcd_at91_init);
+module_exit (ohci_hcd_at91_cleanup);