ssb-hcd.c

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/*
 * Sonics Silicon Backplane
 * Broadcom USB-core driver  (SSB bus glue)
 *
 * Copyright 2011-2012 Hauke Mehrtens <[email protected]>
 *
 * Based on ssb-ohci driver
 * Copyright 2007 Michael Buesch <[email protected]>
 *
 * Derived from the OHCI-PCI driver
 * Copyright 1999 Roman Weissgaerber
 * Copyright 2000-2002 David Brownell
 * Copyright 1999 Linus Torvalds
 * Copyright 1999 Gregory P. Smith
 *
 * Derived from the USBcore related parts of Broadcom-SB
 * Copyright 2005-2011 Broadcom Corporation
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */
#include <linux/ssb/ssb.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb/ehci_pdriver.h>
#include <linux/usb/ohci_pdriver.h>

MODULE_AUTHOR("Hauke Mehrtens");
MODULE_DESCRIPTION("Common USB driver for SSB Bus");
MODULE_LICENSE("GPL");

#define SSB_HCD_TMSLOW_HOSTMODE (1 << 29)

struct ssb_hcd_device {
    struct platform_device *ehci_dev;
    struct platform_device *ohci_dev;

    u32 enable_flags;
};

static void __devinit ssb_hcd_5354wa(struct ssb_device *dev)
{
#ifdef CONFIG_SSB_DRIVER_MIPS
    /* Work around for 5354 failures */
    if (dev->id.revision == 2 && dev->bus->chip_id == 0x5354) {
        /* Change syn01 reg */
        ssb_write32(dev, 0x894, 0x00fe00fe);

        /* Change syn03 reg */
        ssb_write32(dev, 0x89c, ssb_read32(dev, 0x89c) | 0x1);
    }
#endif
}

static void __devinit ssb_hcd_usb20wa(struct ssb_device *dev)
{
    if (dev->id.coreid == SSB_DEV_USB20_HOST) {
        /*
         * USB 2.0 special considerations:
         *
         * In addition to the standard SSB reset sequence, the Host
         * Control Register must be programmed to bring the USB core
         * and various phy components out of reset.
         */
        ssb_write32(dev, 0x200, 0x7ff);

        /* Change Flush control reg */
        ssb_write32(dev, 0x400, ssb_read32(dev, 0x400) & ~8);
        ssb_read32(dev, 0x400);

        /* Change Shim control reg */
        ssb_write32(dev, 0x304, ssb_read32(dev, 0x304) & ~0x100);
        ssb_read32(dev, 0x304);

        udelay(1);

        ssb_hcd_5354wa(dev);
    }
}

/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
static u32 __devinit ssb_hcd_init_chip(struct ssb_device *dev)
{
    u32 flags = 0;

    if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
        /* Put the device into host-mode. */
        flags |= SSB_HCD_TMSLOW_HOSTMODE;

    ssb_device_enable(dev, flags);

    ssb_hcd_usb20wa(dev);

    return flags;
}

static const struct usb_ehci_pdata ehci_pdata = {
};

static const struct usb_ohci_pdata ohci_pdata = {
};

static struct platform_device * __devinit
ssb_hcd_create_pdev(struct ssb_device *dev, bool ohci, u32 addr, u32 len)
{
    struct platform_device *hci_dev;
    struct resource hci_res[2];
    int ret = -ENOMEM;

    memset(hci_res, 0, sizeof(hci_res));

    hci_res[0].start = addr;
    hci_res[0].end = hci_res[0].start + len - 1;
    hci_res[0].flags = IORESOURCE_MEM;

    hci_res[1].start = dev->irq;
    hci_res[1].flags = IORESOURCE_IRQ;

    hci_dev = platform_device_alloc(ohci ? "ohci-platform" :
                    "ehci-platform" , 0);
    if (!hci_dev)
        return NULL;

    hci_dev->dev.parent = dev->dev;
    hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;

    ret = platform_device_add_resources(hci_dev, hci_res,
                        ARRAY_SIZE(hci_res));
    if (ret)
        goto err_alloc;
    if (ohci)
        ret = platform_device_add_data(hci_dev, &ohci_pdata,
                           sizeof(ohci_pdata));
    else
        ret = platform_device_add_data(hci_dev, &ehci_pdata,
                           sizeof(ehci_pdata));
    if (ret)
        goto err_alloc;
    ret = platform_device_add(hci_dev);
    if (ret)
        goto err_alloc;

    return hci_dev;

err_alloc:
    platform_device_put(hci_dev);
    return ERR_PTR(ret);
}

static int __devinit ssb_hcd_probe(struct ssb_device *dev,
                   const struct ssb_device_id *id)
{
    int err, tmp;
    int start, len;
    u16 chipid_top;
    u16 coreid = dev->id.coreid;
    struct ssb_hcd_device *usb_dev;

    /* USBcores are only connected on embedded devices. */
    chipid_top = (dev->bus->chip_id & 0xFF00);
    if (chipid_top != 0x4700 && chipid_top != 0x5300)
        return -ENODEV;

    /* TODO: Probably need checks here; is the core connected? */

    if (dma_set_mask(dev->dma_dev, DMA_BIT_MASK(32)) ||
        dma_set_coherent_mask(dev->dma_dev, DMA_BIT_MASK(32)))
        return -EOPNOTSUPP;

    usb_dev = kzalloc(sizeof(struct ssb_hcd_device), GFP_KERNEL);
    if (!usb_dev)
        return -ENOMEM;

    /* We currently always attach SSB_DEV_USB11_HOSTDEV
     * as HOST OHCI. If we want to attach it as Client device,
     * we must branch here and call into the (yet to
     * be written) Client mode driver. Same for remove(). */
    usb_dev->enable_flags = ssb_hcd_init_chip(dev);

    tmp = ssb_read32(dev, SSB_ADMATCH0);

    start = ssb_admatch_base(tmp);
    len = (coreid == SSB_DEV_USB20_HOST) ? 0x800 : ssb_admatch_size(tmp);
    usb_dev->ohci_dev = ssb_hcd_create_pdev(dev, true, start, len);
    if (IS_ERR(usb_dev->ohci_dev)) {
        err = PTR_ERR(usb_dev->ohci_dev);
        goto err_free_usb_dev;
    }

    if (coreid == SSB_DEV_USB20_HOST) {
        start = ssb_admatch_base(tmp) + 0x800; /* ehci core offset */
        usb_dev->ehci_dev = ssb_hcd_create_pdev(dev, false, start, len);
        if (IS_ERR(usb_dev->ehci_dev)) {
            err = PTR_ERR(usb_dev->ehci_dev);
            goto err_unregister_ohci_dev;
        }
    }

    ssb_set_drvdata(dev, usb_dev);
    return 0;

err_unregister_ohci_dev:
    platform_device_unregister(usb_dev->ohci_dev);
err_free_usb_dev:
    kfree(usb_dev);
    return err;
}

static void __devexit ssb_hcd_remove(struct ssb_device *dev)
{
    struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
    struct platform_device *ohci_dev = usb_dev->ohci_dev;
    struct platform_device *ehci_dev = usb_dev->ehci_dev;

    if (ohci_dev)
        platform_device_unregister(ohci_dev);
    if (ehci_dev)
        platform_device_unregister(ehci_dev);

    ssb_device_disable(dev, 0);
}

static void __devexit ssb_hcd_shutdown(struct ssb_device *dev)
{
    ssb_device_disable(dev, 0);
}

#ifdef CONFIG_PM

static int ssb_hcd_suspend(struct ssb_device *dev, pm_message_t state)
{
    ssb_device_disable(dev, 0);

    return 0;
}

static int ssb_hcd_resume(struct ssb_device *dev)
{
    struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);

    ssb_device_enable(dev, usb_dev->enable_flags);

    return 0;
}

#else /* !CONFIG_PM */
#define ssb_hcd_suspend NULL
#define ssb_hcd_resume  NULL
#endif /* CONFIG_PM */

static const struct ssb_device_id ssb_hcd_table[] __devinitconst = {
    SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
    SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
    SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB20_HOST, SSB_ANY_REV),
    SSB_DEVTABLE_END
};
MODULE_DEVICE_TABLE(ssb, ssb_hcd_table);

static struct ssb_driver ssb_hcd_driver = {
    .name       = KBUILD_MODNAME,
    .id_table   = ssb_hcd_table,
    .probe      = ssb_hcd_probe,
    .remove     = __devexit_p(ssb_hcd_remove),
    .shutdown   = ssb_hcd_shutdown,
    .suspend    = ssb_hcd_suspend,
    .resume     = ssb_hcd_resume,
};

static int __init ssb_hcd_init(void)
{
    return ssb_driver_register(&ssb_hcd_driver);
}
module_init(ssb_hcd_init);

static void __exit ssb_hcd_exit(void)
{
    ssb_driver_unregister(&ssb_hcd_driver);
}
module_exit(ssb_hcd_exit);