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135db0485c
Various minor fixes to some SOC bus glue for EHCI:
- Remove a bogus copyright (by "me"!) which someone added to the FSL
driver, and an irrelevant comment.
- Un-break MODULE_ALIAS() directives after platform_bus hotplugging
acquired a backwards-incompatible change. (Which didn't fix ANY
of the in-tree drivers it prevented from hotplugging -- sigh.)
- Remove some bogus assignments of platform_bus_type; that's done by
the platform_bus code.
- Add some FIXMEs for drivers with that pointless two-level idiom for
probe() and remove() routines. ("Obfuscation" is a non-goal.)
That should help avoid future bus glue which copies that idiom.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
281 lines
7.4 KiB
C
281 lines
7.4 KiB
C
/*
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* EHCI HCD (Host Controller Driver) for USB.
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*
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* Bus Glue for AMD Alchemy Au1xxx
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*
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* Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
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*
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* Modified for AMD Alchemy Au1200 EHC
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* by K.Boge <karsten.boge@amd.com>
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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 <asm/mach-au1x00/au1000.h>
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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_PHYPLLEN (1<<19)
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#define USB_MCFG_EHCCLKEN (1<<17)
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#define USB_MCFG_UCAM (1<<7)
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#define USB_MCFG_EBMEN (1<<3)
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#define USB_MCFG_EMEMEN (1<<2)
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#define USBH_ENABLE_CE (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
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#ifdef CONFIG_DMA_COHERENT
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#define USBH_ENABLE_INIT (USBH_ENABLE_CE \
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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_EBMEN | USB_MCFG_EMEMEN)
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#else
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#define USBH_ENABLE_INIT (USBH_ENABLE_CE \
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| USB_MCFG_PFEN | USB_MCFG_RDCOMB \
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| USB_MCFG_SSDEN \
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| USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
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#endif
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#define USBH_DISABLE (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
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extern int usb_disabled(void);
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/*-------------------------------------------------------------------------*/
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static void au1xxx_start_ehc(struct platform_device *dev)
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{
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pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
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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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/* enable host controller */
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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),
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USB_HOST_CONFIG);
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au_readl(USB_HOST_CONFIG);
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udelay(1000);
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pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
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}
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static void au1xxx_stop_ehc(struct platform_device *dev)
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{
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pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
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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(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
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USB_HOST_CONFIG);
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au_readl(USB_HOST_CONFIG);
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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_ehci_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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int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
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struct usb_hcd **hcd_out, 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 ehci_hcd *ehci;
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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", 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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au1xxx_start_ehc(dev);
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if (dev->resource[1].flags != IORESOURCE_IRQ) {
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pr_debug("resource[1] is not IORESOURCE_IRQ");
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retval = -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");
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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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ehci = hcd_to_ehci(hcd);
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ehci->caps = hcd->regs;
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ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
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/* cache this readonly data; minimize chip reads */
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ehci->hcs_params = readl(&ehci->caps->hcs_params);
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/* ehci_hcd_init(hcd_to_ehci(hcd)); */
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retval =
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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_ehc(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_ehci_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_ehci_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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void usb_ehci_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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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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au1xxx_stop_ehc(dev);
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}
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/*-------------------------------------------------------------------------*/
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static const struct hc_driver ehci_au1xxx_hc_driver = {
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.description = hcd_name,
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.product_desc = "Au1xxx 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_USB2,
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/*
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* basic lifecycle operations
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*
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* FIXME -- ehci_init() doesn't do enough here.
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* See ehci-ppc-soc for a complete implementation.
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*/
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.reset = ehci_init,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_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 = 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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/*
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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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};
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/*-------------------------------------------------------------------------*/
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static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = NULL;
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int ret;
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pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
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if (usb_disabled())
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return -ENODEV;
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/* FIXME we only want one one probe() not two */
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ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
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return ret;
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}
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static int ehci_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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/* FIXME we only want one one remove() not two */
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usb_ehci_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 ehci_hcd_au1xxx_drv_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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return 0;
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}
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static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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return 0;
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}
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*/
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MODULE_ALIAS("platform:au1xxx-ehci");
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static struct platform_driver ehci_hcd_au1xxx_driver = {
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.probe = ehci_hcd_au1xxx_drv_probe,
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.remove = ehci_hcd_au1xxx_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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/*.suspend = ehci_hcd_au1xxx_drv_suspend, */
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/*.resume = ehci_hcd_au1xxx_drv_resume, */
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.driver = {
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.name = "au1xxx-ehci",
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}
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};
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