- 根目录:
- drivers
- usb
- host
- bcma-hcd.c
/*
* Broadcom specific Advanced Microcontroller Bus
* Broadcom USB-core driver (BCMA 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/bcma/bcma.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 BCMA Bus");
MODULE_LICENSE("GPL");
struct bcma_hcd_device {
struct platform_device *ehci_dev;
struct platform_device *ohci_dev;
};
/* Wait for bitmask in a register to get set or cleared.
* timeout is in units of ten-microseconds.
*/
static int bcma_wait_bits(struct bcma_device *dev, u16 reg, u32 bitmask,
int timeout)
{
int i;
u32 val;
for (i = 0; i < timeout; i++) {
val = bcma_read32(dev, reg);
if ((val & bitmask) == bitmask)
return 0;
udelay(10);
}
return -ETIMEDOUT;
}
static void bcma_hcd_4716wa(struct bcma_device *dev)
{
#ifdef CONFIG_BCMA_DRIVER_MIPS
/* Work around for 4716 failures. */
if (dev->bus->chipinfo.id == 0x4716) {
u32 tmp;
tmp = bcma_cpu_clock(&dev->bus->drv_mips);
if (tmp >= 480000000)
tmp = 0x1846b; /* set CDR to 0x11(fast) */
else if (tmp == 453000000)
tmp = 0x1046b; /* set CDR to 0x10(slow) */
else
tmp = 0;
/* Change Shim mdio control reg to fix host not acking at
* high frequencies
*/
if (tmp) {
bcma_write32(dev, 0x524, 0x1); /* write sel to enable */
udelay(500);
bcma_write32(dev, 0x524, tmp);
udelay(500);
bcma_write32(dev, 0x524, 0x4ab);
udelay(500);
bcma_read32(dev, 0x528);
bcma_write32(dev, 0x528, 0x80000000);
}
}
#endif /* CONFIG_BCMA_DRIVER_MIPS */
}
/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
static void bcma_hcd_init_chip(struct bcma_device *dev)
{
u32 tmp;
/*
* USB 2.0 special considerations:
*
* 1. Since the core supports both OHCI and EHCI functions, it must
* only be reset once.
*
* 2. In addition to the standard SI reset sequence, the Host Control
* Register must be programmed to bring the USB core and various
* phy components out of reset.
*/
if (!bcma_core_is_enabled(dev)) {
bcma_core_enable(dev, 0);
mdelay(10);
if (dev->id.rev >= 5) {
/* Enable Misc PLL */
tmp = bcma_read32(dev, 0x1e0);
tmp |= 0x100;
bcma_write32(dev, 0x1e0, tmp);
if (bcma_wait_bits(dev, 0x1e0, 1 << 24, 100))
printk(KERN_EMERG "Failed to enable misc PPL!\n");
/* Take out of resets */
bcma_write32(dev, 0x200, 0x4ff);
udelay(25);
bcma_write32(dev, 0x200, 0x6ff);
udelay(25);
/* Make sure digital and AFE are locked in USB PHY */
bcma_write32(dev, 0x524, 0x6b);
udelay(50);
tmp = bcma_read32(dev, 0x524);
udelay(50);
bcma_write32(dev, 0x524, 0xab);
udelay(50);
tmp = bcma_read32(dev, 0x524);
udelay(50);
bcma_write32(dev, 0x524, 0x2b);
udelay(50);
tmp = bcma_read32(dev, 0x524);
udelay(50);
bcma_write32(dev, 0x524, 0x10ab);
udelay(50);
tmp = bcma_read32(dev, 0x524);
if (bcma_wait_bits(dev, 0x528, 0xc000, 10000)) {
tmp = bcma_read32(dev, 0x528);
printk(KERN_EMERG
"USB20H mdio_rddata 0x%08x\n", tmp);
}
bcma_write32(dev, 0x528, 0x80000000);
tmp = bcma_read32(dev, 0x314);
udelay(265);
bcma_write32(dev, 0x200, 0x7ff);
udelay(10);
/* Take USB and HSIC out of non-driving modes */
bcma_write32(dev, 0x510, 0);
} else {
bcma_write32(dev, 0x200, 0x7ff);
udelay(1);
}
bcma_hcd_4716wa(dev);
}
}
static const struct usb_ehci_pdata ehci_pdata = {
};
static const struct usb_ohci_pdata ohci_pdata = {
};
static struct platform_device *bcma_hcd_create_pdev(struct bcma_device *dev, bool ohci, u32 addr)
{
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 + 0x1000 - 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 bcma_hcd_probe(struct bcma_device *dev)
{
int err;
u16 chipid_top;
u32 ohci_addr;
struct bcma_hcd_device *usb_dev;
struct bcma_chipinfo *chipinfo;
chipinfo = &dev->bus->chipinfo;
/* USBcores are only connected on embedded devices. */
chipid_top = (chipinfo->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 bcma_hcd_device), GFP_KERNEL);
if (!usb_dev)
return -ENOMEM;
bcma_hcd_init_chip(dev);
/* In AI chips EHCI is addrspace 0, OHCI is 1 */
ohci_addr = dev->addr_s[0];
if ((chipinfo->id == 0x5357 || chipinfo->id == 0x4749)
&& chipinfo->rev == 0)
ohci_addr = 0x18009000;
usb_dev->ohci_dev = bcma_hcd_create_pdev(dev, true, ohci_addr);
if (IS_ERR(usb_dev->ohci_dev)) {
err = PTR_ERR(usb_dev->ohci_dev);
goto err_free_usb_dev;
}
usb_dev->ehci_dev = bcma_hcd_create_pdev(dev, false, dev->addr);
if (IS_ERR(usb_dev->ehci_dev)) {
err = PTR_ERR(usb_dev->ehci_dev);
goto err_unregister_ohci_dev;
}
bcma_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 bcma_hcd_remove(struct bcma_device *dev)
{
struct bcma_hcd_device *usb_dev = bcma_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);
bcma_core_disable(dev, 0);
}
static void bcma_hcd_shutdown(struct bcma_device *dev)
{
bcma_core_disable(dev, 0);
}
#ifdef CONFIG_PM
static int bcma_hcd_suspend(struct bcma_device *dev)
{
bcma_core_disable(dev, 0);
return 0;
}
static int bcma_hcd_resume(struct bcma_device *dev)
{
bcma_core_enable(dev, 0);
return 0;
}
#else /* !CONFIG_PM */
#define bcma_hcd_suspend NULL
#define bcma_hcd_resume NULL
#endif /* CONFIG_PM */
static const struct bcma_device_id bcma_hcd_table[] = {
BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_USB20_HOST, BCMA_ANY_REV, BCMA_ANY_CLASS),
BCMA_CORETABLE_END
};
MODULE_DEVICE_TABLE(bcma, bcma_hcd_table);
static struct bcma_driver bcma_hcd_driver = {
.name = KBUILD_MODNAME,
.id_table = bcma_hcd_table,
.probe = bcma_hcd_probe,
.remove = bcma_hcd_remove,
.shutdown = bcma_hcd_shutdown,
.suspend = bcma_hcd_suspend,
.resume = bcma_hcd_resume,
};
static int __init bcma_hcd_init(void)
{
return bcma_driver_register(&bcma_hcd_driver);
}
module_init(bcma_hcd_init);
static void __exit bcma_hcd_exit(void)
{
bcma_driver_unregister(&bcma_hcd_driver);
}
module_exit(bcma_hcd_exit);