272 lines
6.4 KiB
C
272 lines
6.4 KiB
C
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// SPDX-License-Identifier: GPL-1.0+
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/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
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* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
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* (C) Copyright 2002 Hewlett-Packard Company
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*
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* SA1111 Bus Glue
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*
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* Written by Christopher Hoover <ch@hpl.hp.com>
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* Based on fragments of previous driver by Russell King et al.
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*
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* This file is licenced under the GPL.
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*/
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#include <asm/mach-types.h>
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#include <asm/hardware/sa1111.h>
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#ifndef CONFIG_SA1111
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#error "This file is SA-1111 bus glue. CONFIG_SA1111 must be defined."
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#endif
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#define USB_STATUS 0x0118
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#define USB_RESET 0x011c
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#define USB_IRQTEST 0x0120
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#define USB_RESET_FORCEIFRESET (1 << 0)
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#define USB_RESET_FORCEHCRESET (1 << 1)
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#define USB_RESET_CLKGENRESET (1 << 2)
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#define USB_RESET_SIMSCALEDOWN (1 << 3)
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#define USB_RESET_USBINTTEST (1 << 4)
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#define USB_RESET_SLEEPSTBYEN (1 << 5)
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#define USB_RESET_PWRSENSELOW (1 << 6)
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#define USB_RESET_PWRCTRLLOW (1 << 7)
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#define USB_STATUS_IRQHCIRMTWKUP (1 << 7)
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#define USB_STATUS_IRQHCIBUFFACC (1 << 8)
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#define USB_STATUS_NIRQHCIM (1 << 9)
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#define USB_STATUS_NHCIMFCLR (1 << 10)
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#define USB_STATUS_USBPWRSENSE (1 << 11)
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#if 0
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static void dump_hci_status(struct usb_hcd *hcd, const char *label)
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{
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unsigned long status = readl_relaxed(hcd->regs + USB_STATUS);
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printk(KERN_DEBUG "%s USB_STATUS = { %s%s%s%s%s}\n", label,
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((status & USB_STATUS_IRQHCIRMTWKUP) ? "IRQHCIRMTWKUP " : ""),
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((status & USB_STATUS_IRQHCIBUFFACC) ? "IRQHCIBUFFACC " : ""),
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((status & USB_STATUS_NIRQHCIM) ? "" : "IRQHCIM "),
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((status & USB_STATUS_NHCIMFCLR) ? "" : "HCIMFCLR "),
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((status & USB_STATUS_USBPWRSENSE) ? "USBPWRSENSE " : ""));
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}
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#endif
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static int ohci_sa1111_reset(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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ohci_hcd_init(ohci);
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return ohci_init(ohci);
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}
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static int ohci_sa1111_start(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int ret;
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ret = ohci_run(ohci);
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if (ret < 0) {
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ohci_err(ohci, "can't start\n");
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ohci_stop(hcd);
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}
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return ret;
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}
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static const struct hc_driver ohci_sa1111_hc_driver = {
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.description = hcd_name,
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.product_desc = "SA-1111 OHCI",
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.hcd_priv_size = sizeof(struct ohci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ohci_irq,
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.flags = HCD_USB11 | HCD_DMA | HCD_MEMORY,
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/*
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* basic lifecycle operations
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*/
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.reset = ohci_sa1111_reset,
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.start = ohci_sa1111_start,
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.stop = ohci_stop,
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.shutdown = ohci_shutdown,
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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 = ohci_urb_enqueue,
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.urb_dequeue = ohci_urb_dequeue,
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.endpoint_disable = ohci_endpoint_disable,
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/*
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* scheduling support
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*/
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.get_frame_number = ohci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ohci_hub_status_data,
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.hub_control = ohci_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ohci_bus_suspend,
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.bus_resume = ohci_bus_resume,
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#endif
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.start_port_reset = ohci_start_port_reset,
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};
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static int sa1111_start_hc(struct sa1111_dev *dev)
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{
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unsigned int usb_rst = 0;
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int ret;
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dev_dbg(&dev->dev, "starting SA-1111 OHCI USB Controller\n");
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if (machine_is_xp860() ||
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machine_is_assabet() ||
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machine_is_pfs168() ||
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machine_is_badge4())
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usb_rst = USB_RESET_PWRSENSELOW | USB_RESET_PWRCTRLLOW;
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/*
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* Configure the power sense and control lines. Place the USB
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* host controller in reset.
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*/
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writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
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dev->mapbase + USB_RESET);
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/*
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* Now, carefully enable the USB clock, and take
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* the USB host controller out of reset.
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*/
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ret = sa1111_enable_device(dev);
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if (ret == 0) {
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udelay(11);
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writel_relaxed(usb_rst, dev->mapbase + USB_RESET);
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}
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return ret;
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}
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static void sa1111_stop_hc(struct sa1111_dev *dev)
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{
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unsigned int usb_rst;
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dev_dbg(&dev->dev, "stopping SA-1111 OHCI USB Controller\n");
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/*
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* Put the USB host controller into reset.
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*/
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usb_rst = readl_relaxed(dev->mapbase + USB_RESET);
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writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
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dev->mapbase + USB_RESET);
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/*
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* Stop the USB clock.
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*/
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sa1111_disable_device(dev);
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}
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/**
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* ohci_hcd_sa1111_probe - initialize SA-1111-based HCDs
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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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*/
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static int ohci_hcd_sa1111_probe(struct sa1111_dev *dev)
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{
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struct usb_hcd *hcd;
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int ret, irq;
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if (usb_disabled())
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return -ENODEV;
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/*
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* We don't call dma_set_mask_and_coherent() here because the
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* DMA mask has already been appropraitely setup by the core
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* SA-1111 bus code (which includes bug workarounds.)
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*/
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hcd = usb_create_hcd(&ohci_sa1111_hc_driver, &dev->dev, "sa1111");
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = dev->res.start;
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hcd->rsrc_len = resource_size(&dev->res);
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irq = sa1111_get_irq(dev, 1);
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if (irq <= 0) {
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ret = irq ? : -ENXIO;
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goto err1;
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}
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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dev_dbg(&dev->dev, "request_mem_region failed\n");
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ret = -EBUSY;
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goto err1;
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}
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hcd->regs = dev->mapbase;
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ret = sa1111_start_hc(dev);
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if (ret)
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goto err2;
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ret = usb_add_hcd(hcd, irq, 0);
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if (ret == 0) {
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device_wakeup_enable(hcd->self.controller);
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return ret;
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}
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sa1111_stop_hc(dev);
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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 ret;
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}
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/**
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* ohci_hcd_sa1111_remove - shutdown processing for SA-1111-based HCDs
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* @dev: USB Host Controller being removed
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*
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* Reverses the effect of ohci_hcd_sa1111_probe(), first invoking
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* the HCD's stop() method.
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*/
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static int ohci_hcd_sa1111_remove(struct sa1111_dev *dev)
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{
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struct usb_hcd *hcd = sa1111_get_drvdata(dev);
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usb_remove_hcd(hcd);
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sa1111_stop_hc(dev);
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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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return 0;
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}
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static void ohci_hcd_sa1111_shutdown(struct device *_dev)
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{
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struct sa1111_dev *dev = to_sa1111_device(_dev);
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struct usb_hcd *hcd = sa1111_get_drvdata(dev);
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if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
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hcd->driver->shutdown(hcd);
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sa1111_stop_hc(dev);
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}
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}
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static struct sa1111_driver ohci_hcd_sa1111_driver = {
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.drv = {
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.name = "sa1111-ohci",
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.owner = THIS_MODULE,
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.shutdown = ohci_hcd_sa1111_shutdown,
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},
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.devid = SA1111_DEVID_USB,
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.probe = ohci_hcd_sa1111_probe,
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.remove = ohci_hcd_sa1111_remove,
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};
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