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linux-sg2042/drivers/usb/host/ohci-pnx4008.c

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/*
* drivers/usb/host/ohci-pnx4008.c
*
* driver for Philips PNX4008 USB Host
*
* Authors: Dmitry Chigirev <source@mvista.com>
* Vitaly Wool <vitalywool@gmail.com>
*
* register initialization is based on code examples provided by Philips
* Copyright (c) 2005 Koninklijke Philips Electronics N.V.
*
* NOTE: This driver does not have suspend/resume functionality
* This driver is intended for engineering development purposes only
*
* 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/mach-types.h>
#include <asm/arch/platform.h>
#include <asm/arch/irqs.h>
#include <asm/arch/gpio.h>
#define USB_CTRL IO_ADDRESS(PNX4008_PWRMAN_BASE + 0x64)
/* USB_CTRL bit defines */
#define USB_SLAVE_HCLK_EN (1 << 24)
#define USB_HOST_NEED_CLK_EN (1 << 21)
#define USB_OTG_CLK_CTRL IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF4)
#define USB_OTG_CLK_STAT IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF8)
/* USB_OTG_CLK_CTRL bit defines */
#define AHB_M_CLOCK_ON (1 << 4)
#define OTG_CLOCK_ON (1 << 3)
#define I2C_CLOCK_ON (1 << 2)
#define DEV_CLOCK_ON (1 << 1)
#define HOST_CLOCK_ON (1 << 0)
#define USB_OTG_STAT_CONTROL IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0x110)
/* USB_OTG_STAT_CONTROL bit defines */
#define TRANSPARENT_I2C_EN (1 << 7)
#define HOST_EN (1 << 0)
/* ISP1301 USB transceiver I2C registers */
#define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
#define MC1_SPEED_REG (1 << 0)
#define MC1_SUSPEND_REG (1 << 1)
#define MC1_DAT_SE0 (1 << 2)
#define MC1_TRANSPARENT (1 << 3)
#define MC1_BDIS_ACON_EN (1 << 4)
#define MC1_OE_INT_EN (1 << 5)
#define MC1_UART_EN (1 << 6)
#define MC1_MASK 0x7f
#define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
#define MC2_GLOBAL_PWR_DN (1 << 0)
#define MC2_SPD_SUSP_CTRL (1 << 1)
#define MC2_BI_DI (1 << 2)
#define MC2_TRANSP_BDIR0 (1 << 3)
#define MC2_TRANSP_BDIR1 (1 << 4)
#define MC2_AUDIO_EN (1 << 5)
#define MC2_PSW_EN (1 << 6)
#define MC2_EN2V7 (1 << 7)
#define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
# define OTG1_DP_PULLUP (1 << 0)
# define OTG1_DM_PULLUP (1 << 1)
# define OTG1_DP_PULLDOWN (1 << 2)
# define OTG1_DM_PULLDOWN (1 << 3)
# define OTG1_ID_PULLDOWN (1 << 4)
# define OTG1_VBUS_DRV (1 << 5)
# define OTG1_VBUS_DISCHRG (1 << 6)
# define OTG1_VBUS_CHRG (1 << 7)
#define ISP1301_OTG_STATUS 0x10 /* u8 readonly */
# define OTG_B_SESS_END (1 << 6)
# define OTG_B_SESS_VLD (1 << 7)
#define ISP1301_I2C_ADDR 0x2C
#define ISP1301_I2C_MODE_CONTROL_1 0x4
#define ISP1301_I2C_MODE_CONTROL_2 0x12
#define ISP1301_I2C_OTG_CONTROL_1 0x6
#define ISP1301_I2C_OTG_CONTROL_2 0x10
#define ISP1301_I2C_INTERRUPT_SOURCE 0x8
#define ISP1301_I2C_INTERRUPT_LATCH 0xA
#define ISP1301_I2C_INTERRUPT_FALLING 0xC
#define ISP1301_I2C_INTERRUPT_RISING 0xE
#define ISP1301_I2C_REG_CLEAR_ADDR 1
struct i2c_driver isp1301_driver;
struct i2c_client *isp1301_i2c_client;
extern int usb_disabled(void);
extern int ocpi_enable(void);
static struct clk *usb_clk;
static int isp1301_probe(struct i2c_adapter *adap);
static int isp1301_detach(struct i2c_client *client);
static int isp1301_command(struct i2c_client *client, unsigned int cmd,
void *arg);
static unsigned short normal_i2c[] =
{ ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END };
static unsigned short dummy_i2c_addrlist[] = { I2C_CLIENT_END };
static struct i2c_client_address_data addr_data = {
.normal_i2c = normal_i2c,
.probe = dummy_i2c_addrlist,
.ignore = dummy_i2c_addrlist,
};
struct i2c_driver isp1301_driver = {
.id = I2C_DRIVERID_I2CDEV, /* Fake Id */
.class = I2C_CLASS_HWMON,
.attach_adapter = isp1301_probe,
.detach_client = isp1301_detach,
.command = isp1301_command
};
static int isp1301_attach(struct i2c_adapter *adap, int addr, int kind)
{
struct i2c_client *c;
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return -ENOMEM;
strcpy(c->name, "isp1301");
c->flags = 0;
c->addr = addr;
c->adapter = adap;
c->driver = &isp1301_driver;
isp1301_i2c_client = c;
return i2c_attach_client(c);
}
static int isp1301_probe(struct i2c_adapter *adap)
{
return i2c_probe(adap, &addr_data, isp1301_attach);
}
static int isp1301_detach(struct i2c_client *client)
{
i2c_detach_client(client);
kfree(isp1301_i2c_client);
return 0;
}
/* No commands defined */
static int isp1301_command(struct i2c_client *client, unsigned int cmd,
void *arg)
{
return 0;
}
static void i2c_write(u8 buf, u8 subaddr)
{
char tmpbuf[2];
tmpbuf[0] = subaddr; /*register number */
tmpbuf[1] = buf; /*register data */
i2c_master_send(isp1301_i2c_client, &tmpbuf[0], 2);
}
static void isp1301_configure(void)
{
/* PNX4008 only supports DAT_SE0 USB mode */
/* PNX4008 R2A requires setting the MAX603 to output 3.6V */
/* Power up externel charge-pump */
i2c_write(MC1_DAT_SE0 | MC1_SPEED_REG, ISP1301_I2C_MODE_CONTROL_1);
i2c_write(~(MC1_DAT_SE0 | MC1_SPEED_REG),
ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
i2c_write(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL,
ISP1301_I2C_MODE_CONTROL_2);
i2c_write(~(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL),
ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR);
i2c_write(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN,
ISP1301_I2C_OTG_CONTROL_1);
i2c_write(~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN),
ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
i2c_write(0xFF,
ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR);
i2c_write(0xFF,
ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR);
i2c_write(0xFF,
ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR);
}
static inline void isp1301_vbus_on(void)
{
i2c_write(OTG1_VBUS_DRV, ISP1301_I2C_OTG_CONTROL_1);
}
static inline void isp1301_vbus_off(void)
{
i2c_write(OTG1_VBUS_DRV,
ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
}
static void pnx4008_start_hc(void)
{
unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
__raw_writel(tmp, USB_OTG_STAT_CONTROL);
isp1301_vbus_on();
}
static void pnx4008_stop_hc(void)
{
unsigned long tmp;
isp1301_vbus_off();
tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
__raw_writel(tmp, USB_OTG_STAT_CONTROL);
}
static int __devinit ohci_pnx4008_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
if ((ret = ohci_init(ohci)) < 0)
return ret;
if ((ret = ohci_run(ohci)) < 0) {
dev_err(hcd->self.controller, "can't start\n");
ohci_stop(hcd);
return ret;
}
return 0;
}
static const struct hc_driver ohci_pnx4008_hc_driver = {
.description = hcd_name,
.product_desc = "pnx4008 OHCI",
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* basic lifecycle operations
*/
.start = ohci_pnx4008_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
/*
* scheduling support
*/
.get_frame_number = ohci_get_frame,
/*
* root hub support
*/
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
.hub_irq_enable = ohci_rhsc_enable,
#ifdef CONFIG_PM
.bus_suspend = ohci_bus_suspend,
.bus_resume = ohci_bus_resume,
#endif
.start_port_reset = ohci_start_port_reset,
};
#define USB_CLOCK_MASK (AHB_M_CLOCK_ON| OTG_CLOCK_ON | HOST_CLOCK_ON | I2C_CLOCK_ON)
static void pnx4008_set_usb_bits(void)
{
start_int_set_falling_edge(SE_USB_OTG_ATX_INT_N);
start_int_ack(SE_USB_OTG_ATX_INT_N);
start_int_umask(SE_USB_OTG_ATX_INT_N);
start_int_set_rising_edge(SE_USB_OTG_TIMER_INT);
start_int_ack(SE_USB_OTG_TIMER_INT);
start_int_umask(SE_USB_OTG_TIMER_INT);
start_int_set_rising_edge(SE_USB_I2C_INT);
start_int_ack(SE_USB_I2C_INT);
start_int_umask(SE_USB_I2C_INT);
start_int_set_rising_edge(SE_USB_INT);
start_int_ack(SE_USB_INT);
start_int_umask(SE_USB_INT);
start_int_set_rising_edge(SE_USB_NEED_CLK_INT);
start_int_ack(SE_USB_NEED_CLK_INT);
start_int_umask(SE_USB_NEED_CLK_INT);
start_int_set_rising_edge(SE_USB_AHB_NEED_CLK_INT);
start_int_ack(SE_USB_AHB_NEED_CLK_INT);
start_int_umask(SE_USB_AHB_NEED_CLK_INT);
}
static void pnx4008_unset_usb_bits(void)
{
start_int_mask(SE_USB_OTG_ATX_INT_N);
start_int_mask(SE_USB_OTG_TIMER_INT);
start_int_mask(SE_USB_I2C_INT);
start_int_mask(SE_USB_INT);
start_int_mask(SE_USB_NEED_CLK_INT);
start_int_mask(SE_USB_AHB_NEED_CLK_INT);
}
static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd = 0;
struct ohci_hcd *ohci;
const struct hc_driver *driver = &ohci_pnx4008_hc_driver;
int ret = 0, irq;
dev_dbg(&pdev->dev, "%s: " DRIVER_INFO " (pnx4008)\n", hcd_name);
if (usb_disabled()) {
err("USB is disabled");
ret = -ENODEV;
goto out;
}
if (pdev->num_resources != 2
|| pdev->resource[0].flags != IORESOURCE_MEM
|| pdev->resource[1].flags != IORESOURCE_IRQ) {
err("Invalid resource configuration");
ret = -ENODEV;
goto out;
}
/* Enable AHB slave USB clock, needed for further USB clock control */
__raw_writel(USB_SLAVE_HCLK_EN | (1 << 19), USB_CTRL);
ret = i2c_add_driver(&isp1301_driver);
if (ret < 0) {
err("failed to connect I2C to ISP1301 USB Transceiver");
goto out;
}
isp1301_configure();
/* Enable USB PLL */
usb_clk = clk_get(&pdev->dev, "ck_pll5");
if (IS_ERR(usb_clk)) {
err("failed to acquire USB PLL");
ret = PTR_ERR(usb_clk);
goto out1;
}
ret = clk_enable(usb_clk);
if (ret < 0) {
err("failed to start USB PLL");
goto out2;
}
ret = clk_set_rate(usb_clk, 48000);
if (ret < 0) {
err("failed to set USB clock rate");
goto out3;
}
__raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
/* Set to enable all needed USB clocks */
__raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);
while ((__raw_readl(USB_OTG_CLK_STAT) & USB_CLOCK_MASK) !=
USB_CLOCK_MASK) ;
hcd = usb_create_hcd (driver, &pdev->dev, pdev->dev.bus_id);
if (!hcd) {
err("Failed to allocate HC buffer");
ret = -ENOMEM;
goto out3;
}
/* Set all USB bits in the Start Enable register */
pnx4008_set_usb_bits();
hcd->rsrc_start = pdev->resource[0].start;
hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
dev_dbg(&pdev->dev, "request_mem_region failed\n");
ret = -ENOMEM;
goto out4;
}
hcd->regs = (void __iomem *)pdev->resource[0].start;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = -ENXIO;
goto out4;
}
pnx4008_start_hc();
platform_set_drvdata(pdev, hcd);
ohci = hcd_to_ohci(hcd);
ohci_hcd_init(ohci);
dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
if (ret == 0)
return ret;
pnx4008_stop_hc();
out4:
pnx4008_unset_usb_bits();
usb_put_hcd(hcd);
out3:
clk_disable(usb_clk);
out2:
clk_put(usb_clk);
out1:
i2c_del_driver(&isp1301_driver);
out:
return ret;
}
static int usb_hcd_pnx4008_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_remove_hcd(hcd);
pnx4008_stop_hc();
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
pnx4008_unset_usb_bits();
clk_disable(usb_clk);
clk_put(usb_clk);
i2c_del_driver(&isp1301_driver);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver usb_hcd_pnx4008_driver = {
.driver = {
.name = "usb-ohci",
},
.probe = usb_hcd_pnx4008_probe,
.remove = usb_hcd_pnx4008_remove,
};
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