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/*
* Sonics Silicon Backplane
* Broadcom USB-core driver (SSB bus glue)
*
* Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
*
* Based on ssb-ohci driver
* Copyright 2007 Michael Buesch <m@bues.ch>
*
* 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 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 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 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 *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 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_and_coherent(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 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 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[] = {
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),
{},
};
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 = 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);
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