// SPDX-License-Identifier: GPL-2.0
/*
* 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
*/
#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 == 0 x5354) {
/* Change syn01 reg */
ssb_write32(dev, 0 x894, 0 x00fe00fe);
/* Change syn03 reg */
ssb_write32(dev, 0 x89c, ssb_read32(dev, 0 x89c) | 0 x1);
}
#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, 0 x200, 0 x7ff);
/* Change Flush control reg */
ssb_write32(dev, 0 x400, ssb_read32(dev, 0 x400) & ~8 );
ssb_read32(dev, 0 x400);
/* Change Shim control reg */
ssb_write32(dev, 0 x304, ssb_read32(dev, 0 x304) & ~0 x100);
ssb_read32(dev, 0 x304);
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;
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 ERR_PTR(-ENOMEM);
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 & 0 xFF00);
if (chipid_top != 0 x4700 && chipid_top != 0 x5300)
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 = devm_kzalloc(dev->dev, 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) ? 0 x800 : ssb_admatch_size(tmp);
usb_dev->ohci_dev = ssb_hcd_create_pdev(dev, true , start, len);
if (IS_ERR(usb_dev->ohci_dev))
return PTR_ERR(usb_dev->ohci_dev);
if (coreid == SSB_DEV_USB20_HOST) {
start = ssb_admatch_base(tmp) + 0 x800; /* 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);
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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