--- /dev/null
+/*
+ * PMC MSP EHCI (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 2006-2010 PMC-Sierra Inc
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+
+/* includes */
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/usb.h>
+#include <msp_usb.h>
+
+/* stream disable*/
+#define USB_CTRL_MODE_STREAM_DISABLE 0x10
+
+/* threshold */
+#define USB_CTRL_FIFO_THRESH 0x00300000
+
+/* register offset for usb_mode */
+#define USB_EHCI_REG_USB_MODE 0x68
+
+/* register offset for usb fifo */
+#define USB_EHCI_REG_USB_FIFO 0x24
+
+/* register offset for usb status */
+#define USB_EHCI_REG_USB_STATUS 0x44
+
+/* serial/parallel transceiver */
+#define USB_EHCI_REG_BIT_STAT_STS (1<<29)
+
+/* TWI USB0 host device pin */
+#define MSP_PIN_USB0_HOST_DEV 49
+
+/* TWI USB1 host device pin */
+#define MSP_PIN_USB1_HOST_DEV 50
+
+
+static void usb_hcd_tdi_set_mode(struct ehci_hcd *ehci)
+{
+ u8 *base;
+ u8 *statreg;
+ u8 *fiforeg;
+ u32 val;
+ struct ehci_regs *reg_base = ehci->regs;
+
+ /* get register base */
+ base = (u8 *)reg_base + USB_EHCI_REG_USB_MODE;
+ statreg = (u8 *)reg_base + USB_EHCI_REG_USB_STATUS;
+ fiforeg = (u8 *)reg_base + USB_EHCI_REG_USB_FIFO;
+
+ /* Disable controller mode stream */
+ val = ehci_readl(ehci, (u32 *)base);
+ ehci_writel(ehci, (val | USB_CTRL_MODE_STREAM_DISABLE),
+ (u32 *)base);
+
+ /* clear STS to select parallel transceiver interface */
+ val = ehci_readl(ehci, (u32 *)statreg);
+ val = val & ~USB_EHCI_REG_BIT_STAT_STS;
+ ehci_writel(ehci, val, (u32 *)statreg);
+
+ /* write to set the proper fifo threshold */
+ ehci_writel(ehci, USB_CTRL_FIFO_THRESH, (u32 *)fiforeg);
+
+ /* set TWI GPIO USB_HOST_DEV pin high */
+ gpio_direction_output(MSP_PIN_USB0_HOST_DEV, 1);
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+ gpio_direction_output(MSP_PIN_USB1_HOST_DEV, 1);
+#endif
+}
+
+/* called during probe() after chip reset completes */
+static int ehci_msp_setup(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int retval;
+ 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));
+ dbg_hcs_params(ehci, "reset");
+ dbg_hcc_params(ehci, "reset");
+
+ /* cache this readonly data; minimize chip reads */
+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+ hcd->has_tt = 1;
+
+ retval = ehci_halt(ehci);
+ if (retval)
+ return retval;
+
+ ehci_reset(ehci);
+
+ /* data structure init */
+ retval = ehci_init(hcd);
+ if (retval)
+ return retval;
+
+ usb_hcd_tdi_set_mode(ehci);
+ ehci_port_power(ehci, 0);
+
+ return retval;
+}
+
+
+/* configure so an HC device and id are always provided
+ * always called with process context; sleeping is OK
+ */
+
+static int usb_hcd_msp_map_regs(struct mspusb_device *dev)
+{
+ struct resource *res;
+ struct platform_device *pdev = &dev->dev;
+ u32 res_len;
+ int retval;
+
+ /* MAB register space */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (res == NULL)
+ return -ENOMEM;
+ res_len = res->end - res->start + 1;
+ if (!request_mem_region(res->start, res_len, "mab regs"))
+ return -EBUSY;
+
+ dev->mab_regs = ioremap_nocache(res->start, res_len);
+ if (dev->mab_regs == NULL) {
+ retval = -ENOMEM;
+ goto err1;
+ }
+
+ /* MSP USB register space */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ if (res == NULL) {
+ retval = -ENOMEM;
+ goto err2;
+ }
+ res_len = res->end - res->start + 1;
+ if (!request_mem_region(res->start, res_len, "usbid regs")) {
+ retval = -EBUSY;
+ goto err2;
+ }
+ dev->usbid_regs = ioremap_nocache(res->start, res_len);
+ if (dev->usbid_regs == NULL) {
+ retval = -ENOMEM;
+ goto err3;
+ }
+
+ return 0;
+err3:
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ res_len = res->end - res->start + 1;
+ release_mem_region(res->start, res_len);
+err2:
+ iounmap(dev->mab_regs);
+err1:
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ res_len = res->end - res->start + 1;
+ release_mem_region(res->start, res_len);
+ dev_err(&pdev->dev, "Failed to map non-EHCI regs.\n");
+ return retval;
+}
+
+/**
+ * usb_hcd_msp_probe - initialize PMC MSP-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_hcd_msp_probe(const struct hc_driver *driver,
+ struct platform_device *dev)
+{
+ int retval;
+ struct usb_hcd *hcd;
+ struct resource *res;
+ struct ehci_hcd *ehci ;
+
+ hcd = usb_create_hcd(driver, &dev->dev, "pmcmsp");
+ if (!hcd)
+ return -ENOMEM;
+
+ res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ pr_debug("No IOMEM resource info for %s.\n", dev->name);
+ retval = -ENOMEM;
+ goto err1;
+ }
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = res->end - res->start + 1;
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, dev->name)) {
+ retval = -EBUSY;
+ goto err1;
+ }
+ hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
+ if (!hcd->regs) {
+ pr_debug("ioremap failed");
+ retval = -ENOMEM;
+ goto err2;
+ }
+
+ res = platform_get_resource(dev, IORESOURCE_IRQ, 0);
+ if (res == NULL) {
+ dev_err(&dev->dev, "No IRQ resource info for %s.\n", dev->name);
+ retval = -ENOMEM;
+ goto err3;
+ }
+
+ /* Map non-EHCI register spaces */
+ retval = usb_hcd_msp_map_regs(to_mspusb_device(dev));
+ if (retval != 0)
+ goto err3;
+
+ ehci = hcd_to_ehci(hcd);
+ ehci->big_endian_mmio = 1;
+ ehci->big_endian_desc = 1;
+
+
+ retval = usb_add_hcd(hcd, res->start, IRQF_SHARED);
+ if (retval == 0)
+ return 0;
+
+ usb_remove_hcd(hcd);
+err3:
+ iounmap(hcd->regs);
+err2:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+ usb_put_hcd(hcd);
+
+ return retval;
+}
+
+
+
+/**
+ * usb_hcd_msp_remove - shutdown processing for PMC MSP-based HCDs
+ * @dev: USB Host Controller being removed
+ * Context: !in_interrupt()
+ *
+ * Reverses the effect of usb_hcd_msp_probe(), first invoking
+ * the HCD's stop() method. It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ *
+ * may be called without controller electrically present
+ * may be called with controller, bus, and devices active
+ */
+void usb_hcd_msp_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);
+}
+
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+/*
+ * Wrapper around the main ehci_irq. Since both USB host controllers are
+ * sharing the same IRQ, need to first determine whether we're the intended
+ * recipient of this interrupt.
+ */
+static irqreturn_t ehci_msp_irq(struct usb_hcd *hcd)
+{
+ u32 int_src;
+ struct device *dev = hcd->self.controller;
+ struct platform_device *pdev;
+ struct mspusb_device *mdev;
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ /* need to reverse-map a couple of containers to get our device */
+ pdev = to_platform_device(dev);
+ mdev = to_mspusb_device(pdev);
+
+ /* Check to see if this interrupt is for this host controller */
+ int_src = ehci_readl(ehci, &mdev->mab_regs->int_stat);
+ if (int_src & (1 << pdev->id))
+ return ehci_irq(hcd);
+
+ /* Not for this device */
+ return IRQ_NONE;
+}
+#endif /* DUAL_USB */
+
+static const struct hc_driver ehci_msp_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "PMC MSP EHCI",
+ .hcd_priv_size = sizeof(struct ehci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+ .irq = ehci_msp_irq,
+#else
+ .irq = ehci_irq,
+#endif
+ .flags = HCD_MEMORY | HCD_USB2,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = ehci_msp_setup,
+ .start = ehci_run,
+ .shutdown = ehci_shutdown,
+ .start = ehci_run,
+ .stop = ehci_stop,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = ehci_urb_enqueue,
+ .urb_dequeue = ehci_urb_dequeue,
+ .endpoint_disable = ehci_endpoint_disable,
+ .endpoint_reset = ehci_endpoint_reset,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = ehci_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = ehci_hub_status_data,
+ .hub_control = ehci_hub_control,
+ .bus_suspend = ehci_bus_suspend,
+ .bus_resume = ehci_bus_resume,
+ .relinquish_port = ehci_relinquish_port,
+ .port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
+};
+
+static int ehci_hcd_msp_drv_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ pr_debug("In ehci_hcd_msp_drv_probe");
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ gpio_request(MSP_PIN_USB0_HOST_DEV, "USB0_HOST_DEV_GPIO");
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+ gpio_request(MSP_PIN_USB1_HOST_DEV, "USB1_HOST_DEV_GPIO");
+#endif
+
+ ret = usb_hcd_msp_probe(&ehci_msp_hc_driver, pdev);
+
+ return ret;
+}
+
+static int ehci_hcd_msp_drv_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ usb_hcd_msp_remove(hcd, pdev);
+
+ /* free TWI GPIO USB_HOST_DEV pin */
+ gpio_free(MSP_PIN_USB0_HOST_DEV);
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+ gpio_free(MSP_PIN_USB1_HOST_DEV);
+#endif
+
+ return 0;
+}
+
+MODULE_ALIAS("pmcmsp-ehci");
+
+static struct platform_driver ehci_hcd_msp_driver = {
+ .probe = ehci_hcd_msp_drv_probe,
+ .remove = ehci_hcd_msp_drv_remove,
+ .driver = {
+ .name = "pmcmsp-ehci",
+ .owner = THIS_MODULE,
+ },
+};
projects / platform / kernel / linux-rpi.git / commitdiff