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linux/drivers/usb/host/bcma-hcd.c
Rafał Miłecki adbff3a4f9 USB: bcma: separate code initializing USB 2.0 core 
This splits one big probing function into two smaller ones. The main one
is now responsible for the generic stuff: allocating memory & enabling
power using GPIO. The new one contains code that is specific to the USB
2.0 bcma core.
This will allow adding support for the USB 3.0 bcma core (handling XHCI)
in the future.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-01-24 20:37:47 -08:00

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/*
* Broadcom specific Advanced Microcontroller Bus
* Broadcom USB-core driver (BCMA bus glue)
*
* Copyright 2011-2015 Hauke Mehrtens <hauke@hauke-m.de>
* Copyright 2015 Felix Fietkau <nbd@openwrt.org>
*
* 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/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.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 bcma_device *core;
struct platform_device *ehci_dev;
struct platform_device *ohci_dev;
struct gpio_desc *gpio_desc;
};
/* 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_mips(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 void bcma_hcd_init_chip_arm_phy(struct bcma_device *dev)
{
struct bcma_device *arm_core;
void __iomem *dmu;
arm_core = bcma_find_core(dev->bus, BCMA_CORE_ARMCA9);
if (!arm_core) {
dev_err(&dev->dev, "can not find ARM Cortex A9 ihost core\n");
return;
}
dmu = ioremap_nocache(arm_core->addr_s[0], 0x1000);
if (!dmu) {
dev_err(&dev->dev, "can not map ARM Cortex A9 ihost core\n");
return;
}
/* Unlock DMU PLL settings */
iowrite32(0x0000ea68, dmu + 0x180);
/* Write USB 2.0 PLL control setting */
iowrite32(0x00dd10c3, dmu + 0x164);
/* Lock DMU PLL settings */
iowrite32(0x00000000, dmu + 0x180);
iounmap(dmu);
}
static void bcma_hcd_init_chip_arm_hc(struct bcma_device *dev)
{
u32 val;
/*
* Delay after PHY initialized to ensure HC is ready to be configured
*/
usleep_range(1000, 2000);
/* Set packet buffer OUT threshold */
val = bcma_read32(dev, 0x94);
val &= 0xffff;
val |= 0x80 << 16;
bcma_write32(dev, 0x94, val);
/* Enable break memory transfer */
val = bcma_read32(dev, 0x9c);
val |= 1;
bcma_write32(dev, 0x9c, val);
}
static void bcma_hcd_init_chip_arm(struct bcma_device *dev)
{
bcma_core_enable(dev, 0);
if (dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM4707 ||
dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM53018) {
if (dev->bus->chipinfo.pkg == BCMA_PKG_ID_BCM4707 ||
dev->bus->chipinfo.pkg == BCMA_PKG_ID_BCM4708)
bcma_hcd_init_chip_arm_phy(dev);
bcma_hcd_init_chip_arm_hc(dev);
}
}
static void bcma_hci_platform_power_gpio(struct bcma_device *dev, bool val)
{
struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
if (IS_ERR_OR_NULL(usb_dev->gpio_desc))
return;
gpiod_set_value(usb_dev->gpio_desc, val);
}
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,
const char *name, u32 addr,
const void *data,
size_t size)
{
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 + 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(name, 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 (data)
ret = platform_device_add_data(hci_dev, data, size);
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_usb20_init(struct bcma_hcd_device *usb_dev)
{
struct bcma_device *dev = usb_dev->core;
struct bcma_chipinfo *chipinfo = &dev->bus->chipinfo;
u32 ohci_addr;
int err;
if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
return -EOPNOTSUPP;
switch (dev->id.id) {
case BCMA_CORE_NS_USB20:
bcma_hcd_init_chip_arm(dev);
break;
case BCMA_CORE_USB20_HOST:
bcma_hcd_init_chip_mips(dev);
break;
default:
return -ENODEV;
}
/* In AI chips EHCI is addrspace 0, OHCI is 1 */
ohci_addr = dev->addr_s[0];
if ((chipinfo->id == BCMA_CHIP_ID_BCM5357 ||
chipinfo->id == BCMA_CHIP_ID_BCM4749)
&& chipinfo->rev == 0)
ohci_addr = 0x18009000;
usb_dev->ohci_dev = bcma_hcd_create_pdev(dev, "ohci-platform",
ohci_addr, &ohci_pdata,
sizeof(ohci_pdata));
if (IS_ERR(usb_dev->ohci_dev))
return PTR_ERR(usb_dev->ohci_dev);
usb_dev->ehci_dev = bcma_hcd_create_pdev(dev, "ehci-platform",
dev->addr, &ehci_pdata,
sizeof(ehci_pdata));
if (IS_ERR(usb_dev->ehci_dev)) {
err = PTR_ERR(usb_dev->ehci_dev);
goto err_unregister_ohci_dev;
}
return 0;
err_unregister_ohci_dev:
platform_device_unregister(usb_dev->ohci_dev);
return err;
}
static int bcma_hcd_probe(struct bcma_device *core)
{
int err;
struct bcma_hcd_device *usb_dev;
/* TODO: Probably need checks here; is the core connected? */
usb_dev = devm_kzalloc(&core->dev, sizeof(struct bcma_hcd_device),
GFP_KERNEL);
if (!usb_dev)
return -ENOMEM;
usb_dev->core = core;
if (core->dev.of_node)
usb_dev->gpio_desc = devm_get_gpiod_from_child(&core->dev, "vcc",
&core->dev.of_node->fwnode);
if (!IS_ERR_OR_NULL(usb_dev->gpio_desc))
gpiod_direction_output(usb_dev->gpio_desc, 1);
switch (core->id.id) {
case BCMA_CORE_USB20_HOST:
case BCMA_CORE_NS_USB20:
err = bcma_hcd_usb20_init(usb_dev);
if (err)
return err;
break;
default:
return -ENODEV;
}
bcma_set_drvdata(core, usb_dev);
return 0;
}
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_hci_platform_power_gpio(dev, false);
bcma_core_disable(dev, 0);
}
#ifdef CONFIG_PM
static int bcma_hcd_suspend(struct bcma_device *dev)
{
bcma_hci_platform_power_gpio(dev, false);
bcma_core_disable(dev, 0);
return 0;
}
static int bcma_hcd_resume(struct bcma_device *dev)
{
bcma_hci_platform_power_gpio(dev, true);
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_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_USB20, BCMA_ANY_REV, BCMA_ANY_CLASS),
{},
};
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);
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