326 lines
7.4 KiB
C
326 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PMC MSP EHCI (Host Controller Driver) for USB.
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*
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* (C) Copyright 2006-2010 PMC-Sierra Inc
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*/
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/* includes */
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/usb.h>
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#include <msp_usb.h>
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/* stream disable*/
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#define USB_CTRL_MODE_STREAM_DISABLE 0x10
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/* threshold */
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#define USB_CTRL_FIFO_THRESH 0x00300000
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/* register offset for usb_mode */
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#define USB_EHCI_REG_USB_MODE 0x68
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/* register offset for usb fifo */
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#define USB_EHCI_REG_USB_FIFO 0x24
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/* register offset for usb status */
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#define USB_EHCI_REG_USB_STATUS 0x44
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/* serial/parallel transceiver */
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#define USB_EHCI_REG_BIT_STAT_STS (1<<29)
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/* TWI USB0 host device pin */
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#define MSP_PIN_USB0_HOST_DEV 49
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/* TWI USB1 host device pin */
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#define MSP_PIN_USB1_HOST_DEV 50
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static void usb_hcd_tdi_set_mode(struct ehci_hcd *ehci)
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{
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u8 *base;
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u8 *statreg;
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u8 *fiforeg;
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u32 val;
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struct ehci_regs *reg_base = ehci->regs;
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/* get register base */
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base = (u8 *)reg_base + USB_EHCI_REG_USB_MODE;
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statreg = (u8 *)reg_base + USB_EHCI_REG_USB_STATUS;
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fiforeg = (u8 *)reg_base + USB_EHCI_REG_USB_FIFO;
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/* Disable controller mode stream */
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val = ehci_readl(ehci, (u32 *)base);
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ehci_writel(ehci, (val | USB_CTRL_MODE_STREAM_DISABLE),
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(u32 *)base);
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/* clear STS to select parallel transceiver interface */
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val = ehci_readl(ehci, (u32 *)statreg);
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val = val & ~USB_EHCI_REG_BIT_STAT_STS;
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ehci_writel(ehci, val, (u32 *)statreg);
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/* write to set the proper fifo threshold */
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ehci_writel(ehci, USB_CTRL_FIFO_THRESH, (u32 *)fiforeg);
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/* set TWI GPIO USB_HOST_DEV pin high */
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gpio_direction_output(MSP_PIN_USB0_HOST_DEV, 1);
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}
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/* called during probe() after chip reset completes */
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static int ehci_msp_setup(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int retval;
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ehci->big_endian_mmio = 1;
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ehci->big_endian_desc = 1;
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ehci->caps = hcd->regs;
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hcd->has_tt = 1;
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retval = ehci_setup(hcd);
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if (retval)
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return retval;
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usb_hcd_tdi_set_mode(ehci);
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return retval;
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}
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/* configure so an HC device and id are always provided
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* always called with process context; sleeping is OK
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*/
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static int usb_hcd_msp_map_regs(struct mspusb_device *dev)
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{
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struct resource *res;
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struct platform_device *pdev = &dev->dev;
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u32 res_len;
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int retval;
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/* MAB register space */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (res == NULL)
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return -ENOMEM;
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res_len = resource_size(res);
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if (!request_mem_region(res->start, res_len, "mab regs"))
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return -EBUSY;
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dev->mab_regs = ioremap_nocache(res->start, res_len);
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if (dev->mab_regs == NULL) {
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retval = -ENOMEM;
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goto err1;
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}
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/* MSP USB register space */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
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if (res == NULL) {
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retval = -ENOMEM;
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goto err2;
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}
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res_len = resource_size(res);
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if (!request_mem_region(res->start, res_len, "usbid regs")) {
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retval = -EBUSY;
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goto err2;
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}
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dev->usbid_regs = ioremap_nocache(res->start, res_len);
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if (dev->usbid_regs == NULL) {
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retval = -ENOMEM;
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goto err3;
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}
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return 0;
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err3:
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res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
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res_len = resource_size(res);
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release_mem_region(res->start, res_len);
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err2:
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iounmap(dev->mab_regs);
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err1:
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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res_len = resource_size(res);
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release_mem_region(res->start, res_len);
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dev_err(&pdev->dev, "Failed to map non-EHCI regs.\n");
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return retval;
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}
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/**
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* usb_hcd_msp_probe - initialize PMC MSP-based HCDs
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* Context: !in_interrupt()
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*
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* Allocates basic resources for this USB host controller, and
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* then invokes the start() method for the HCD associated with it
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* through the hotplug entry's driver_data.
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*
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*/
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int usb_hcd_msp_probe(const struct hc_driver *driver,
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struct platform_device *dev)
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{
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int retval;
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struct usb_hcd *hcd;
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struct resource *res;
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struct ehci_hcd *ehci ;
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hcd = usb_create_hcd(driver, &dev->dev, "pmcmsp");
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if (!hcd)
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return -ENOMEM;
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res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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pr_debug("No IOMEM resource info for %s.\n", dev->name);
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retval = -ENOMEM;
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goto err1;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, dev->name)) {
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retval = -EBUSY;
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goto err1;
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}
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hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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pr_debug("ioremap failed");
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retval = -ENOMEM;
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goto err2;
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}
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res = platform_get_resource(dev, IORESOURCE_IRQ, 0);
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if (res == NULL) {
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dev_err(&dev->dev, "No IRQ resource info for %s.\n", dev->name);
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retval = -ENOMEM;
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goto err3;
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}
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/* Map non-EHCI register spaces */
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retval = usb_hcd_msp_map_regs(to_mspusb_device(dev));
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if (retval != 0)
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goto err3;
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ehci = hcd_to_ehci(hcd);
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ehci->big_endian_mmio = 1;
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ehci->big_endian_desc = 1;
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retval = usb_add_hcd(hcd, res->start, IRQF_SHARED);
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if (retval == 0) {
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device_wakeup_enable(hcd->self.controller);
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return 0;
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}
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usb_remove_hcd(hcd);
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err3:
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iounmap(hcd->regs);
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err2:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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err1:
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usb_put_hcd(hcd);
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return retval;
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}
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/**
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* usb_hcd_msp_remove - shutdown processing for PMC MSP-based HCDs
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* @dev: USB Host Controller being removed
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* Context: !in_interrupt()
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*
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* Reverses the effect of usb_hcd_msp_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, normally "rmmod", "apmd", or something similar.
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*
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* may be called without controller electrically present
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* may be called with controller, bus, and devices active
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*/
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void usb_hcd_msp_remove(struct usb_hcd *hcd, struct platform_device *dev)
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{
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usb_remove_hcd(hcd);
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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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usb_put_hcd(hcd);
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}
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static const struct hc_driver ehci_msp_hc_driver = {
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.description = hcd_name,
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.product_desc = "PMC MSP EHCI",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_msp_setup,
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.shutdown = ehci_shutdown,
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.start = ehci_run,
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.stop = ehci_stop,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static int ehci_hcd_msp_drv_probe(struct platform_device *pdev)
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{
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int ret;
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pr_debug("In ehci_hcd_msp_drv_probe");
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if (usb_disabled())
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return -ENODEV;
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gpio_request(MSP_PIN_USB0_HOST_DEV, "USB0_HOST_DEV_GPIO");
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ret = usb_hcd_msp_probe(&ehci_msp_hc_driver, pdev);
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return ret;
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}
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static int ehci_hcd_msp_drv_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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usb_hcd_msp_remove(hcd, pdev);
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/* free TWI GPIO USB_HOST_DEV pin */
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gpio_free(MSP_PIN_USB0_HOST_DEV);
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return 0;
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}
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MODULE_ALIAS("pmcmsp-ehci");
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static struct platform_driver ehci_hcd_msp_driver = {
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.probe = ehci_hcd_msp_drv_probe,
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.remove = ehci_hcd_msp_drv_remove,
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.driver = {
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.name = "pmcmsp-ehci",
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},
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};
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