381 lines
8.3 KiB
C
381 lines
8.3 KiB
C
/*
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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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* Bus Glue for pxa27x
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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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* Modified for LH7A404 from ohci-sa1111.c
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* by Durgesh Pattamatta <pattamattad@sharpsec.com>
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*
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* Modified for pxa27x from ohci-lh7a404.c
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* by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
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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/device.h>
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#include <linux/signal.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <asm/mach-types.h>
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#include <asm/hardware.h>
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#include <asm/arch/pxa-regs.h>
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#include <asm/arch/ohci.h>
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#define PXA_UHC_MAX_PORTNUM 3
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#define UHCRHPS(x) __REG2( 0x4C000050, (x)<<2 )
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static struct clk *usb_clk;
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/*
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PMM_NPS_MODE -- PMM Non-power switching mode
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Ports are powered continuously.
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PMM_GLOBAL_MODE -- PMM global switching mode
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All ports are powered at the same time.
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PMM_PERPORT_MODE -- PMM per port switching mode
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Ports are powered individually.
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*/
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static int pxa27x_ohci_select_pmm( int mode )
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{
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switch ( mode ) {
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case PMM_NPS_MODE:
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UHCRHDA |= RH_A_NPS;
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break;
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case PMM_GLOBAL_MODE:
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UHCRHDA &= ~(RH_A_NPS & RH_A_PSM);
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break;
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case PMM_PERPORT_MODE:
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UHCRHDA &= ~(RH_A_NPS);
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UHCRHDA |= RH_A_PSM;
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/* Set port power control mask bits, only 3 ports. */
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UHCRHDB |= (0x7<<17);
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break;
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default:
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printk( KERN_ERR
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"Invalid mode %d, set to non-power switch mode.\n",
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mode );
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UHCRHDA |= RH_A_NPS;
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}
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return 0;
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}
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extern int usb_disabled(void);
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/*-------------------------------------------------------------------------*/
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static int pxa27x_start_hc(struct device *dev)
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{
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int retval = 0;
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struct pxaohci_platform_data *inf;
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inf = dev->platform_data;
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clk_enable(usb_clk);
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UHCHR |= UHCHR_FHR;
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udelay(11);
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UHCHR &= ~UHCHR_FHR;
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UHCHR |= UHCHR_FSBIR;
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while (UHCHR & UHCHR_FSBIR)
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cpu_relax();
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if (inf->init)
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retval = inf->init(dev);
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if (retval < 0)
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return retval;
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UHCHR &= ~UHCHR_SSE;
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UHCHIE = (UHCHIE_UPRIE | UHCHIE_RWIE);
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/* Clear any OTG Pin Hold */
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if (PSSR & PSSR_OTGPH)
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PSSR |= PSSR_OTGPH;
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return 0;
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}
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static void pxa27x_stop_hc(struct device *dev)
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{
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struct pxaohci_platform_data *inf;
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inf = dev->platform_data;
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if (inf->exit)
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inf->exit(dev);
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UHCHR |= UHCHR_FHR;
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udelay(11);
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UHCHR &= ~UHCHR_FHR;
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UHCCOMS |= 1;
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udelay(10);
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clk_disable(usb_clk);
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}
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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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* usb_hcd_pxa27x_probe - initialize pxa27x-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_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev)
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{
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int retval;
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struct usb_hcd *hcd;
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struct pxaohci_platform_data *inf;
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inf = pdev->dev.platform_data;
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if (!inf)
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return -ENODEV;
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if (pdev->resource[1].flags != IORESOURCE_IRQ) {
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pr_debug ("resource[1] is not IORESOURCE_IRQ");
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return -ENOMEM;
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}
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usb_clk = clk_get(&pdev->dev, "USBCLK");
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if (IS_ERR(usb_clk))
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return PTR_ERR(usb_clk);
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hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x");
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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");
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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");
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retval = -ENOMEM;
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goto err2;
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}
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if ((retval = pxa27x_start_hc(&pdev->dev)) < 0) {
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pr_debug("pxa27x_start_hc failed");
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goto err3;
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}
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/* Select Power Management Mode */
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pxa27x_ohci_select_pmm(inf->port_mode);
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if (inf->power_budget)
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hcd->power_budget = inf->power_budget;
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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_DISABLED);
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if (retval == 0)
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return retval;
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pxa27x_stop_hc(&pdev->dev);
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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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clk_put(usb_clk);
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return retval;
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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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* usb_hcd_pxa27x_remove - shutdown processing for pxa27x-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_pxa27x_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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*/
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void usb_hcd_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev)
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{
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usb_remove_hcd(hcd);
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pxa27x_stop_hc(&pdev->dev);
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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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clk_put(usb_clk);
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}
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/*-------------------------------------------------------------------------*/
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static int __devinit
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ohci_pxa27x_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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ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci);
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/* The value of NDP in roothub_a is incorrect on this hardware */
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ohci->num_ports = 3;
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if ((ret = ohci_init(ohci)) < 0)
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return ret;
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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_pxa27x_hc_driver = {
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.description = hcd_name,
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.product_desc = "PXA27x 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_pxa27x_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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.hub_irq_enable = ohci_rhsc_enable,
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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_pxa27x_drv_probe(struct platform_device *pdev)
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{
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pr_debug ("In ohci_hcd_pxa27x_drv_probe");
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if (usb_disabled())
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return -ENODEV;
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return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev);
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}
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static int ohci_hcd_pxa27x_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_pxa27x_remove(hcd, pdev);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ohci_hcd_pxa27x_drv_suspend(struct platform_device *pdev, pm_message_t state)
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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 (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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pxa27x_stop_hc(&pdev->dev);
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hcd->state = HC_STATE_SUSPENDED;
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pdev->dev.power.power_state = PMSG_SUSPEND;
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return 0;
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}
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static int ohci_hcd_pxa27x_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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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int status;
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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if ((status = pxa27x_start_hc(&pdev->dev)) < 0)
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return status;
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pdev->dev.power.power_state = PMSG_ON;
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usb_hcd_resume_root_hub(hcd);
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return 0;
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}
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#endif
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static struct platform_driver ohci_hcd_pxa27x_driver = {
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.probe = ohci_hcd_pxa27x_drv_probe,
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.remove = ohci_hcd_pxa27x_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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#ifdef CONFIG_PM
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.suspend = ohci_hcd_pxa27x_drv_suspend,
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.resume = ohci_hcd_pxa27x_drv_resume,
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#endif
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.driver = {
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.name = "pxa27x-ohci",
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},
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};
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