371 lines
8.3 KiB
C
371 lines
8.3 KiB
C
/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* Copyright (C) 2004 SAN People (Pty) Ltd.
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* Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
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*
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* AT91 Bus Glue
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*
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* Based on fragments of 2.4 driver by Rick Bronson.
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* Based on ohci-omap.c
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*
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* This file is licenced under the GPL.
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*/
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include <mach/hardware.h>
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#include <asm/gpio.h>
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#include <mach/board.h>
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#include <mach/cpu.h>
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#ifndef CONFIG_ARCH_AT91
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#error "CONFIG_ARCH_AT91 must be defined."
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#endif
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/* interface and function clocks; sometimes also an AHB clock */
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static struct clk *iclk, *fclk, *hclk;
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static int clocked;
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extern int usb_disabled(void);
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/*-------------------------------------------------------------------------*/
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static void at91_start_clock(void)
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{
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if (cpu_is_at91sam9261())
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clk_enable(hclk);
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clk_enable(iclk);
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clk_enable(fclk);
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clocked = 1;
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}
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static void at91_stop_clock(void)
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{
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clk_disable(fclk);
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clk_disable(iclk);
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if (cpu_is_at91sam9261())
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clk_disable(hclk);
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clocked = 0;
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}
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static void at91_start_hc(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct ohci_regs __iomem *regs = hcd->regs;
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dev_dbg(&pdev->dev, "start\n");
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/*
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* Start the USB clocks.
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*/
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at91_start_clock();
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/*
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* The USB host controller must remain in reset.
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*/
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writel(0, ®s->control);
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}
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static void at91_stop_hc(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct ohci_regs __iomem *regs = hcd->regs;
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dev_dbg(&pdev->dev, "stop\n");
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/*
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* Put the USB host controller into reset.
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*/
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writel(0, ®s->control);
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/*
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* Stop the USB clocks.
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*/
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at91_stop_clock();
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}
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/*-------------------------------------------------------------------------*/
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static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
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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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* usb_hcd_at91_probe - initialize AT91-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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static int usb_hcd_at91_probe(const struct hc_driver *driver,
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struct platform_device *pdev)
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{
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int retval;
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struct usb_hcd *hcd = NULL;
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if (pdev->num_resources != 2) {
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pr_debug("hcd probe: invalid num_resources");
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return -ENODEV;
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}
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if ((pdev->resource[0].flags != IORESOURCE_MEM)
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|| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
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pr_debug("hcd probe: invalid resource type\n");
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return -ENODEV;
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}
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hcd = usb_create_hcd(driver, &pdev->dev, "at91");
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = pdev->resource[0].start;
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hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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pr_debug("request_mem_region failed\n");
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retval = -EBUSY;
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goto err1;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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pr_debug("ioremap failed\n");
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retval = -EIO;
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goto err2;
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}
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iclk = clk_get(&pdev->dev, "ohci_clk");
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fclk = clk_get(&pdev->dev, "uhpck");
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if (cpu_is_at91sam9261())
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hclk = clk_get(&pdev->dev, "hck0");
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at91_start_hc(pdev);
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ohci_hcd_init(hcd_to_ohci(hcd));
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retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
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if (retval == 0)
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return retval;
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/* Error handling */
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at91_stop_hc(pdev);
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if (cpu_is_at91sam9261())
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clk_put(hclk);
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clk_put(fclk);
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clk_put(iclk);
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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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/* may be called with controller, bus, and devices active */
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/**
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* usb_hcd_at91_remove - shutdown processing for AT91-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_at91_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, "rmmod" or something similar.
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*
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*/
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static void usb_hcd_at91_remove(struct usb_hcd *hcd,
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struct platform_device *pdev)
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{
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usb_remove_hcd(hcd);
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at91_stop_hc(pdev);
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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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if (cpu_is_at91sam9261())
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clk_put(hclk);
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clk_put(fclk);
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clk_put(iclk);
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fclk = iclk = hclk = NULL;
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dev_set_drvdata(&pdev->dev, NULL);
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}
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/*-------------------------------------------------------------------------*/
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static int __devinit
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ohci_at91_start (struct usb_hcd *hcd)
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{
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struct at91_usbh_data *board = hcd->self.controller->platform_data;
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struct ohci_hcd *ohci = hcd_to_ohci (hcd);
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int ret;
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if ((ret = ohci_init(ohci)) < 0)
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return ret;
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ohci->num_ports = board->ports;
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if ((ret = ohci_run(ohci)) < 0) {
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err("can't start %s", hcd->self.bus_name);
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ohci_stop(hcd);
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return ret;
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}
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return 0;
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}
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/*-------------------------------------------------------------------------*/
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static const struct hc_driver ohci_at91_hc_driver = {
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.description = hcd_name,
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.product_desc = "AT91 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_MEMORY,
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/*
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* basic lifecycle operations
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*/
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.start = ohci_at91_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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/*-------------------------------------------------------------------------*/
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static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
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{
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struct at91_usbh_data *pdata = pdev->dev.platform_data;
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int i;
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if (pdata) {
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/* REVISIT make the driver support per-port power switching,
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* and also overcurrent detection. Here we assume the ports
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* are always powered while this driver is active, and use
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* active-low power switches.
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*/
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for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
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if (pdata->vbus_pin[i] <= 0)
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continue;
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gpio_request(pdata->vbus_pin[i], "ohci_vbus");
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gpio_direction_output(pdata->vbus_pin[i], 0);
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}
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}
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device_init_wakeup(&pdev->dev, 1);
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return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
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}
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static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
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{
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struct at91_usbh_data *pdata = pdev->dev.platform_data;
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int i;
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if (pdata) {
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for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
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if (pdata->vbus_pin[i] <= 0)
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continue;
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gpio_direction_output(pdata->vbus_pin[i], 1);
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gpio_free(pdata->vbus_pin[i]);
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}
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}
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device_init_wakeup(&pdev->dev, 0);
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usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
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return 0;
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}
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#ifdef CONFIG_PM
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static int
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ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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if (device_may_wakeup(&pdev->dev))
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enable_irq_wake(hcd->irq);
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/*
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* The integrated transceivers seem unable to notice disconnect,
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* reconnect, or wakeup without the 48 MHz clock active. so for
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* correctness, always discard connection state (using reset).
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*
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* REVISIT: some boards will be able to turn VBUS off...
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*/
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if (at91_suspend_entering_slow_clock()) {
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ohci_usb_reset (ohci);
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at91_stop_clock();
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}
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return 0;
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}
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static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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if (device_may_wakeup(&pdev->dev))
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disable_irq_wake(hcd->irq);
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if (!clocked)
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at91_start_clock();
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ohci_finish_controller_resume(hcd);
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return 0;
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}
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#else
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#define ohci_hcd_at91_drv_suspend NULL
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#define ohci_hcd_at91_drv_resume NULL
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#endif
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MODULE_ALIAS("platform:at91_ohci");
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static struct platform_driver ohci_hcd_at91_driver = {
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.probe = ohci_hcd_at91_drv_probe,
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.remove = ohci_hcd_at91_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.suspend = ohci_hcd_at91_drv_suspend,
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.resume = ohci_hcd_at91_drv_resume,
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.driver = {
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.name = "at91_ohci",
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.owner = THIS_MODULE,
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},
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};
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