348 lines
8.7 KiB
C
348 lines
8.7 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 AMD Alchemy Au1xxx
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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 Rusell 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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* Modified for AMD Alchemy Au1xxx
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* by Matt Porter <mporter@kernel.crashing.org>
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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/platform_device.h>
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#include <linux/signal.h>
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#include <asm/mach-au1x00/au1000.h>
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#ifndef CONFIG_SOC_AU1200
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#define USBH_ENABLE_BE (1<<0)
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#define USBH_ENABLE_C (1<<1)
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#define USBH_ENABLE_E (1<<2)
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#define USBH_ENABLE_CE (1<<3)
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#define USBH_ENABLE_RD (1<<4)
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#ifdef __LITTLE_ENDIAN
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#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
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#elif __BIG_ENDIAN
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#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | USBH_ENABLE_BE)
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#else
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#error not byte order defined
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#endif
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#else /* Au1200 */
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#define USB_HOST_CONFIG (USB_MSR_BASE + USB_MSR_MCFG)
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#define USB_MCFG_PFEN (1<<31)
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#define USB_MCFG_RDCOMB (1<<30)
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#define USB_MCFG_SSDEN (1<<23)
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#define USB_MCFG_OHCCLKEN (1<<16)
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#define USB_MCFG_UCAM (1<<7)
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#define USB_MCFG_OBMEN (1<<1)
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#define USB_MCFG_OMEMEN (1<<0)
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#define USBH_ENABLE_CE USB_MCFG_OHCCLKEN
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#ifdef CONFIG_DMA_COHERENT
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#define USBH_ENABLE_INIT (USB_MCFG_OHCCLKEN \
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| USB_MCFG_PFEN | USB_MCFG_RDCOMB \
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| USB_MCFG_SSDEN | USB_MCFG_UCAM \
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| USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
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#else
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#define USBH_ENABLE_INIT (USB_MCFG_OHCCLKEN \
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| USB_MCFG_PFEN | USB_MCFG_RDCOMB \
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| USB_MCFG_SSDEN \
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| USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
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#endif
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#define USBH_DISABLE (USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
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#endif /* Au1200 */
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extern int usb_disabled(void);
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/*-------------------------------------------------------------------------*/
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static void au1xxx_start_ohc(struct platform_device *dev)
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{
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printk(KERN_DEBUG __FILE__
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": starting Au1xxx OHCI USB Controller\n");
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/* enable host controller */
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#ifndef CONFIG_SOC_AU1200
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au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
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udelay(1000);
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au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG);
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udelay(1000);
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#else /* Au1200 */
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/* write HW defaults again in case Yamon cleared them */
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if (au_readl(USB_HOST_CONFIG) == 0) {
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au_writel(0x00d02000, USB_HOST_CONFIG);
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au_readl(USB_HOST_CONFIG);
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udelay(1000);
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}
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au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
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au_readl(USB_HOST_CONFIG);
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udelay(1000);
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au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
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au_readl(USB_HOST_CONFIG);
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udelay(1000);
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#endif /* Au1200 */
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#ifndef CONFIG_SOC_AU1200
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/* wait for reset complete (read register twice; see au1500 errata) */
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while (au_readl(USB_HOST_CONFIG),
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!(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
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#endif
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udelay(1000);
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printk(KERN_DEBUG __FILE__
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": Clock to USB host has been enabled \n");
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}
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static void au1xxx_stop_ohc(struct platform_device *dev)
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{
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printk(KERN_DEBUG __FILE__
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": stopping Au1xxx OHCI USB Controller\n");
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#ifndef CONFIG_SOC_AU1200
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/* Disable clock */
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au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
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#else /* Au1200 */
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/* Disable mem */
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au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
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udelay(1000);
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/* Disable clock */
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au_writel(~USBH_ENABLE_CE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
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au_readl(USB_HOST_CONFIG);
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#endif /* Au1200 */
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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_ohci_au1xxx_probe - initialize Au1xxx-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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static int usb_ohci_au1xxx_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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#if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
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/* Au1200 AB USB does not support coherent memory */
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if (!(read_c0_prid() & 0xff)) {
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pr_info("%s: this is chip revision AB !!\n",
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dev->name);
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pr_info("%s: update your board or re-configure the kernel\n",
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dev->name);
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return -ENODEV;
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}
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#endif
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if (dev->resource[1].flags != IORESOURCE_IRQ) {
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pr_debug("resource[1] is not IORESOURCE_IRQ\n");
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return -ENOMEM;
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}
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hcd = usb_create_hcd(driver, &dev->dev, "au1xxx");
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = dev->resource[0].start;
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hcd->rsrc_len = dev->resource[0].end - dev->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 = -ENOMEM;
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goto err2;
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}
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au1xxx_start_ohc(dev);
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ohci_hcd_init(hcd_to_ohci(hcd));
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retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
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if (retval == 0)
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return retval;
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au1xxx_stop_ohc(dev);
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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 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_au1xxx_remove - shutdown processing for Au1xxx-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_au1xxx_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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static void usb_ohci_au1xxx_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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au1xxx_stop_ohc(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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}
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/*-------------------------------------------------------------------------*/
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static int __devinit
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ohci_au1xxx_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_au1xxx_start, ohci:%p", ohci);
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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_au1xxx_hc_driver = {
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.description = hcd_name,
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.product_desc = "Au1xxx 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_au1xxx_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_au1xxx_drv_probe(struct platform_device *pdev)
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{
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int ret;
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pr_debug ("In ohci_hcd_au1xxx_drv_probe");
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if (usb_disabled())
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return -ENODEV;
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ret = usb_ohci_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev);
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return ret;
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}
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static int ohci_hcd_au1xxx_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_ohci_au1xxx_remove(hcd, pdev);
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return 0;
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}
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/*TBD*/
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/*static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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return 0;
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}
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static int ohci_hcd_au1xxx_drv_resume(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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return 0;
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}
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*/
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static struct platform_driver ohci_hcd_au1xxx_driver = {
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.probe = ohci_hcd_au1xxx_drv_probe,
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.remove = ohci_hcd_au1xxx_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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/*.suspend = ohci_hcd_au1xxx_drv_suspend, */
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/*.resume = ohci_hcd_au1xxx_drv_resume, */
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.driver = {
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.name = "au1xxx-ohci",
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.owner = THIS_MODULE,
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},
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};
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