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|
/*
* Copyright (C) ST-Ericsson SA 2011
*
* Author: Avinash Kumar <avinash.kumar@stericsson.com> for ST-Ericsson
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/platform_device.h>
#include <linux/usb/otg.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mfd/abx500/ab5500.h>
#include <linux/mfd/abx500.h>
#include <linux/regulator/consumer.h>
#include <mach/prcmu.h>
#include <mach/usb.h>
#include <linux/kernel_stat.h>
#include <mach/gpio.h>
#include <linux/wakelock.h>
static struct wake_lock ab5500_musb_wakelock;
/* AB5500 USB macros
*/
#define AB5500_USB_HOST_ENABLE 0x1
#define AB5500_USB_DEVICE_ENABLE 0x2
#define AB5500_MAIN_WATCHDOG_ENABLE 0x1
#define AB5500_MAIN_WATCHDOG_KICK 0x2
#define AB5500_MAIN_WATCHDOG_DISABLE 0x0
#define AB5500_USB_ADP_ENABLE 0x1
#define AB5500_WATCHDOG_DELAY 10
#define AB5500_WATCHDOG_DELAY_US 100
#define AB5500_PHY_DELAY_US 100
#define AB5500_MAIN_WDOG_CTRL_REG 0x01
#define AB5500_USB_LINE_STAT_REG 0x80
#define AB5500_USB_PHY_CTRL_REG 0x8A
#define AB5500_MAIN_WATCHDOG_ENABLE 0x1
#define AB5500_MAIN_WATCHDOG_KICK 0x2
#define AB5500_MAIN_WATCHDOG_DISABLE 0x0
#define AB5500_SYS_CTRL2_BLOCK 0x2
/* UsbLineStatus register bit masks */
#define AB5500_USB_LINK_STATUS_MASK_V1 0x78
#define AB5500_USB_LINK_STATUS_MASK_V2 0xF8
#define USB_PROBE_DELAY 1000 /* 1 seconds */
/* UsbLineStatus register - usb types */
enum ab8500_usb_link_status {
USB_LINK_NOT_CONFIGURED,
USB_LINK_STD_HOST_NC,
USB_LINK_STD_HOST_C_NS,
USB_LINK_STD_HOST_C_S,
USB_LINK_HOST_CHG_NM,
USB_LINK_HOST_CHG_HS,
USB_LINK_HOST_CHG_HS_CHIRP,
USB_LINK_DEDICATED_CHG,
USB_LINK_ACA_RID_A,
USB_LINK_ACA_RID_B,
USB_LINK_ACA_RID_C_NM,
USB_LINK_ACA_RID_C_HS,
USB_LINK_ACA_RID_C_HS_CHIRP,
USB_LINK_HM_IDGND,
USB_LINK_OTG_HOST_NO_CURRENT,
USB_LINK_NOT_VALID_LINK,
USB_LINK_HM_IDGND_V2 = 18,
};
/**
* ab5500_usb_mode - Different states of ab usb_chip
*
* Used for USB cable plug-in state machine
*/
enum ab5500_usb_mode {
USB_IDLE,
USB_DEVICE,
USB_HOST,
USB_DEDICATED_CHG,
};
struct ab5500_usb {
struct otg_transceiver otg;
struct device *dev;
int irq_num_id_fall;
int irq_num_vbus_rise;
int irq_num_vbus_fall;
int irq_num_link_status;
unsigned vbus_draw;
struct delayed_work dwork;
struct work_struct phy_dis_work;
unsigned long link_status_wait;
int rev;
int usb_cs_gpio;
enum ab5500_usb_mode mode;
struct clk *sysclk;
struct regulator *v_ape;
struct abx500_usbgpio_platform_data *usb_gpio;
bool phy_enabled;
};
static int ab5500_usb_irq_setup(struct platform_device *pdev,
struct ab5500_usb *ab);
static int ab5500_usb_boot_detect(struct ab5500_usb *ab);
static int ab5500_usb_link_status_update(struct ab5500_usb *ab);
static void ab5500_usb_phy_enable(struct ab5500_usb *ab, bool sel_host);
static inline struct ab5500_usb *xceiv_to_ab(struct otg_transceiver *x)
{
return container_of(x, struct ab5500_usb, otg);
}
/**
* ab5500_usb_wd_workaround() - Kick the watch dog timer
*
* This function used to Kick the watch dog timer
*/
static void ab5500_usb_wd_workaround(struct ab5500_usb *ab)
{
abx500_set_register_interruptible(ab->dev,
AB5500_SYS_CTRL2_BLOCK,
AB5500_MAIN_WDOG_CTRL_REG,
AB5500_MAIN_WATCHDOG_ENABLE);
udelay(AB5500_WATCHDOG_DELAY_US);
abx500_set_register_interruptible(ab->dev,
AB5500_SYS_CTRL2_BLOCK,
AB5500_MAIN_WDOG_CTRL_REG,
(AB5500_MAIN_WATCHDOG_ENABLE
| AB5500_MAIN_WATCHDOG_KICK));
udelay(AB5500_WATCHDOG_DELAY_US);
abx500_set_register_interruptible(ab->dev,
AB5500_SYS_CTRL2_BLOCK,
AB5500_MAIN_WDOG_CTRL_REG,
AB5500_MAIN_WATCHDOG_DISABLE);
udelay(AB5500_WATCHDOG_DELAY_US);
}
static void ab5500_usb_phy_enable(struct ab5500_usb *ab, bool sel_host)
{
u8 bit;
/* Workaround for spurious interrupt to be checked with Hardware Team*/
if (ab->phy_enabled == true)
return;
ab->phy_enabled = true;
bit = sel_host ? AB5500_USB_HOST_ENABLE :
AB5500_USB_DEVICE_ENABLE;
wake_lock(&ab5500_musb_wakelock);
ab->usb_gpio->enable();
clk_enable(ab->sysclk);
regulator_enable(ab->v_ape);
abx500_mask_and_set_register_interruptible(ab->dev,
AB5500_BANK_USB,
AB5500_USB_PHY_CTRL_REG,
bit, bit);
}
static void ab5500_usb_phy_disable(struct ab5500_usb *ab, bool sel_host)
{
u8 bit;
/* Workaround for spurious interrupt to be checked with Hardware Team*/
if (ab->phy_enabled == false)
return;
ab->phy_enabled = false;
bit = sel_host ? AB5500_USB_HOST_ENABLE :
AB5500_USB_DEVICE_ENABLE;
abx500_mask_and_set_register_interruptible(ab->dev,
AB5500_BANK_USB,
AB5500_USB_PHY_CTRL_REG,
bit, 0);
/* Needed to disable the phy.*/
ab5500_usb_wd_workaround(ab);
clk_disable(ab->sysclk);
regulator_disable(ab->v_ape);
ab->usb_gpio->disable();
wake_unlock(&ab5500_musb_wakelock);
}
#define ab5500_usb_peri_phy_en(ab) ab5500_usb_phy_enable(ab, false)
#define ab5500_usb_peri_phy_dis(ab) ab5500_usb_phy_disable(ab, false)
#define ab5500_usb_host_phy_en(ab) ab5500_usb_phy_enable(ab, true)
#define ab5500_usb_host_phy_dis(ab) ab5500_usb_phy_disable(ab, true)
/* Work created after an link status update handler*/
static int ab5500_usb_link_status_update(struct ab5500_usb *ab)
{
u8 val = 0;
int ret = 0;
int gpioval = 0;
enum ab8500_usb_link_status lsts;
enum usb_xceiv_events event = USB_IDLE;
(void)abx500_get_register_interruptible(ab->dev,
AB5500_BANK_USB, AB5500_USB_LINE_STAT_REG, &val);
if (ab->rev == AB5500_2_0)
lsts = (val & AB5500_USB_LINK_STATUS_MASK_V2) >> 3;
else
lsts = (val & AB5500_USB_LINK_STATUS_MASK_V1) >> 3;
switch (lsts) {
case USB_LINK_STD_HOST_NC:
case USB_LINK_STD_HOST_C_NS:
case USB_LINK_STD_HOST_C_S:
case USB_LINK_HOST_CHG_NM:
case USB_LINK_HOST_CHG_HS:
case USB_LINK_HOST_CHG_HS_CHIRP:
break;
case USB_LINK_HM_IDGND:
if (ab->rev == AB5500_2_0)
break;
/* enable usb chip Select */
ret = gpio_direction_output(ab->usb_cs_gpio, gpioval);
if (ret < 0) {
dev_err(ab->dev, "usb_cs_gpio: gpio direction failed\n");
gpio_free(ab->usb_cs_gpio);
return ret;
}
gpio_set_value(ab->usb_cs_gpio, 1);
ab5500_usb_host_phy_en(ab);
ab->otg.default_a = true;
event = USB_EVENT_ID;
break;
case USB_LINK_HM_IDGND_V2:
if (!(ab->rev == AB5500_2_0))
break;
/* enable usb chip Select */
ret = gpio_direction_output(ab->usb_cs_gpio, gpioval);
if (ret < 0) {
dev_err(ab->dev, "usb_cs_gpio: gpio direction failed\n");
gpio_free(ab->usb_cs_gpio);
return ret;
}
gpio_set_value(ab->usb_cs_gpio, 1);
ab5500_usb_host_phy_en(ab);
ab->otg.default_a = true;
event = USB_EVENT_ID;
break;
default:
break;
}
atomic_notifier_call_chain(&ab->otg.notifier, event, &ab->vbus_draw);
return 0;
}
static void ab5500_usb_delayed_work(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct ab5500_usb *ab = container_of(dwork, struct ab5500_usb, dwork);
ab5500_usb_link_status_update(ab);
}
/**
* This function is used to signal the completion of
* USB Link status register update
*/
static irqreturn_t ab5500_usb_link_status_irq(int irq, void *data)
{
struct ab5500_usb *ab = (struct ab5500_usb *) data;
ab5500_usb_link_status_update(ab);
return IRQ_HANDLED;
}
static irqreturn_t ab5500_usb_device_insert_irq(int irq, void *data)
{
int ret = 0, val = 1;
struct ab5500_usb *ab = (struct ab5500_usb *) data;
enum usb_xceiv_events event;
ab->mode = USB_DEVICE;
ab5500_usb_peri_phy_en(ab);
/* enable usb chip Select */
event = USB_EVENT_VBUS;
ret = gpio_direction_output(ab->usb_cs_gpio, val);
if (ret < 0) {
dev_err(ab->dev, "usb_cs_gpio: gpio direction failed\n");
gpio_free(ab->usb_cs_gpio);
return ret;
}
gpio_set_value(ab->usb_cs_gpio, 1);
atomic_notifier_call_chain(&ab->otg.notifier, event, &ab->vbus_draw);
return IRQ_HANDLED;
}
/**
* This function used to remove the voltage for USB ab->dev mode.
*/
static irqreturn_t ab5500_usb_device_disconnect_irq(int irq, void *data)
{
struct ab5500_usb *ab = (struct ab5500_usb *) data;
/* disable usb chip Select */
gpio_set_value(ab->usb_cs_gpio, 0);
ab5500_usb_peri_phy_dis(ab);
return IRQ_HANDLED;
}
/**
* ab5500_usb_host_disconnect_irq : work handler for host cable insert.
* @work: work structure
*
* This function is used to handle the host cable insert work.
*/
static irqreturn_t ab5500_usb_host_disconnect_irq(int irq, void *data)
{
struct ab5500_usb *ab = (struct ab5500_usb *) data;
/* disable usb chip Select */
gpio_set_value(ab->usb_cs_gpio, 0);
ab5500_usb_host_phy_dis(ab);
return IRQ_HANDLED;
}
static void ab5500_usb_irq_free(struct ab5500_usb *ab)
{
if (ab->irq_num_id_fall)
free_irq(ab->irq_num_id_fall, ab);
if (ab->irq_num_vbus_rise)
free_irq(ab->irq_num_vbus_rise, ab);
if (ab->irq_num_vbus_fall)
free_irq(ab->irq_num_vbus_fall, ab);
if (ab->irq_num_link_status)
free_irq(ab->irq_num_link_status, ab);
}
/**
* ab5500_usb_irq_setup : register USB callback handlers for ab5500
* @mode: value for mode.
*
* This function is used to register USB callback handlers for ab5500.
*/
static int ab5500_usb_irq_setup(struct platform_device *pdev,
struct ab5500_usb *ab)
{
int ret = 0;
int irq, err;
if (!ab->dev)
return -EINVAL;
irq = platform_get_irq_byname(pdev, "usb_idgnd_f");
if (irq < 0) {
dev_err(&pdev->dev, "ID fall irq not found\n");
err = irq;
goto irq_fail;
}
ab->irq_num_id_fall = irq;
irq = platform_get_irq_byname(pdev, "VBUS_F");
if (irq < 0) {
dev_err(&pdev->dev, "VBUS fall irq not found\n");
err = irq;
goto irq_fail;
}
ab->irq_num_vbus_fall = irq;
irq = platform_get_irq_byname(pdev, "VBUS_R");
if (irq < 0) {
dev_err(&pdev->dev, "VBUS raise irq not found\n");
err = irq;
goto irq_fail;
}
ab->irq_num_vbus_rise = irq;
irq = platform_get_irq_byname(pdev, "Link_Update");
if (irq < 0) {
dev_err(&pdev->dev, "Link Update irq not found\n");
err = irq;
goto irq_fail;
}
ab->irq_num_link_status = irq;
ret = request_threaded_irq(ab->irq_num_link_status,
NULL, ab5500_usb_link_status_irq,
IRQF_NO_SUSPEND | IRQF_SHARED,
"usb-link-status-update", ab);
if (ret < 0) {
printk(KERN_ERR "failed to set the callback"
" handler for usb charge"
" detect done\n");
err = ret;
goto irq_fail;
}
ret = request_threaded_irq(ab->irq_num_vbus_rise, NULL,
ab5500_usb_device_insert_irq,
IRQF_NO_SUSPEND | IRQF_SHARED,
"usb-vbus-rise", ab);
if (ret < 0) {
printk(KERN_ERR "failed to set the callback"
" handler for usb ab->dev"
" insertion\n");
err = ret;
goto irq_fail;
}
ret = request_threaded_irq(ab->irq_num_vbus_fall, NULL,
ab5500_usb_device_disconnect_irq,
IRQF_NO_SUSPEND | IRQF_SHARED,
"usb-vbus-fall", ab);
if (ret < 0) {
printk(KERN_ERR "failed to set the callback"
" handler for usb ab->dev"
" removal\n");
err = ret;
goto irq_fail;
}
ret = request_threaded_irq((ab->irq_num_id_fall), NULL,
ab5500_usb_host_disconnect_irq,
IRQF_NO_SUSPEND | IRQF_SHARED,
"usb-id-fall", ab);
if (ret < 0) {
printk(KERN_ERR "failed to set the callback"
" handler for usb host"
" removal\n");
err = ret;
goto irq_fail;
}
ab5500_usb_wd_workaround(ab);
return 0;
irq_fail:
ab5500_usb_irq_free(ab);
return err;
}
/**
* ab5500_usb_boot_detect : detect the USB cable during boot time.
* @mode: value for mode.
*
* This function is used to detect the USB cable during boot time.
*/
static int ab5500_usb_boot_detect(struct ab5500_usb *ab)
{
int ret;
int val = 1;
int usb_status = 0;
int gpioval = 0;
enum ab8500_usb_link_status lsts;
if (!ab->dev)
return -EINVAL;
abx500_mask_and_set_register_interruptible(ab->dev,
AB5500_BANK_USB,
AB5500_USB_PHY_CTRL_REG,
AB5500_USB_DEVICE_ENABLE,
AB5500_USB_DEVICE_ENABLE);
udelay(AB5500_PHY_DELAY_US);
abx500_mask_and_set_register_interruptible(ab->dev,
AB5500_BANK_USB,
AB5500_USB_PHY_CTRL_REG,
AB5500_USB_DEVICE_ENABLE, 0);
abx500_mask_and_set_register_interruptible(ab->dev,
AB5500_BANK_USB,
AB5500_USB_PHY_CTRL_REG,
AB5500_USB_HOST_ENABLE,
AB5500_USB_HOST_ENABLE);
udelay(AB5500_PHY_DELAY_US);
abx500_mask_and_set_register_interruptible(ab->dev,
AB5500_BANK_USB,
AB5500_USB_PHY_CTRL_REG,
AB5500_USB_HOST_ENABLE, 0);
(void)abx500_get_register_interruptible(ab->dev,
AB5500_BANK_USB, AB5500_USB_LINE_STAT_REG, &usb_status);
if (ab->rev == AB5500_2_0)
lsts = (usb_status & AB5500_USB_LINK_STATUS_MASK_V2) >> 3;
else
lsts = (usb_status & AB5500_USB_LINK_STATUS_MASK_V1) >> 3;
switch (lsts) {
case USB_LINK_STD_HOST_NC:
case USB_LINK_STD_HOST_C_NS:
case USB_LINK_STD_HOST_C_S:
case USB_LINK_HOST_CHG_NM:
case USB_LINK_HOST_CHG_HS:
case USB_LINK_HOST_CHG_HS_CHIRP:
ab5500_usb_peri_phy_en(ab);
/* enable usb chip Select */
ret = gpio_direction_output(ab->usb_cs_gpio, val);
if (ret < 0) {
dev_err(ab->dev, "usb_cs_gpio: gpio direction failed\n");
gpio_free(ab->usb_cs_gpio);
return ret;
}
gpio_set_value(ab->usb_cs_gpio, 1);
break;
case USB_LINK_HM_IDGND:
case USB_LINK_HM_IDGND_V2:
/* enable usb chip Select */
ret = gpio_direction_output(ab->usb_cs_gpio, gpioval);
if (ret < 0) {
dev_err(ab->dev, "usb_cs_gpio: gpio direction failed\n");
gpio_free(ab->usb_cs_gpio);
return ret;
}
gpio_set_value(ab->usb_cs_gpio, 1);
ab5500_usb_host_phy_en(ab);
break;
default:
break;
}
return 0;
}
static int ab5500_usb_set_power(struct otg_transceiver *otg, unsigned mA)
{
struct ab5500_usb *ab;
if (!otg)
return -ENODEV;
ab = xceiv_to_ab(otg);
ab->vbus_draw = mA;
atomic_notifier_call_chain(&ab->otg.notifier,
USB_EVENT_VBUS, &ab->vbus_draw);
return 0;
}
static int ab5500_usb_set_suspend(struct otg_transceiver *x, int suspend)
{
/* TODO */
return 0;
}
static int ab5500_usb_set_host(struct otg_transceiver *otg,
struct usb_bus *host)
{
struct ab5500_usb *ab;
if (!otg)
return -ENODEV;
ab = xceiv_to_ab(otg);
/* Some drivers call this function in atomic context.
* Do not update ab5500 registers directly till this
* is fixed.
*/
if (!host) {
ab->otg.host = NULL;
schedule_work(&ab->phy_dis_work);
} else {
ab->otg.host = host;
}
return 0;
}
static int ab5500_usb_set_peripheral(struct otg_transceiver *otg,
struct usb_gadget *gadget)
{
struct ab5500_usb *ab;
if (!otg)
return -ENODEV;
ab = xceiv_to_ab(otg);
/* Some drivers call this function in atomic context.
* Do not update ab5500 registers directly till this
* is fixed.
*/
if (!gadget) {
ab->otg.gadget = NULL;
schedule_work(&ab->phy_dis_work);
} else {
ab->otg.gadget = gadget;
}
return 0;
}
static int __devinit ab5500_usb_probe(struct platform_device *pdev)
{
struct ab5500_usb *ab;
struct abx500_usbgpio_platform_data *usb_pdata =
pdev->dev.platform_data;
int err;
int ret = -1;
ab = kzalloc(sizeof *ab, GFP_KERNEL);
if (!ab)
return -ENOMEM;
ab->dev = &pdev->dev;
ab->otg.dev = ab->dev;
ab->otg.label = "ab5500";
ab->otg.state = OTG_STATE_B_IDLE;
ab->otg.set_host = ab5500_usb_set_host;
ab->otg.set_peripheral = ab5500_usb_set_peripheral;
ab->otg.set_suspend = ab5500_usb_set_suspend;
ab->otg.set_power = ab5500_usb_set_power;
ab->usb_gpio = usb_pdata;
ab->mode = USB_IDLE;
platform_set_drvdata(pdev, ab);
ATOMIC_INIT_NOTIFIER_HEAD(&ab->otg.notifier);
/* v1: Wait for link status to become stable.
* all: Updates form set_host and set_peripheral as they are atomic.
*/
INIT_DELAYED_WORK(&ab->dwork, ab5500_usb_delayed_work);
err = otg_set_transceiver(&ab->otg);
if (err)
dev_err(&pdev->dev, "Can't register transceiver\n");
ab->usb_cs_gpio = ab->usb_gpio->usb_cs;
ab->rev = abx500_get_chip_id(ab->dev);
ab->sysclk = clk_get(ab->dev, "sysclk");
if (IS_ERR(ab->sysclk)) {
ret = PTR_ERR(ab->sysclk);
ab->sysclk = NULL;
return ret;
}
ab->v_ape = regulator_get(ab->dev, "v-ape");
if (!ab->v_ape) {
dev_err(ab->dev, "Could not get v-ape supply\n");
return -EINVAL;
}
ab5500_usb_irq_setup(pdev, ab);
ret = gpio_request(ab->usb_cs_gpio, "usb-cs");
if (ret < 0)
dev_err(&pdev->dev, "usb gpio request fail\n");
/* Aquire GPIO alternate config struct for USB */
err = ab->usb_gpio->get(ab->dev);
if (err < 0)
goto fail1;
/*
* wake lock is acquired when usb cable is connected and released when
* cable is removed
*/
wake_lock_init(&ab5500_musb_wakelock, WAKE_LOCK_SUSPEND, "ab5500-usb");
err = ab5500_usb_boot_detect(ab);
if (err < 0)
goto fail1;
return 0;
fail1:
ab5500_usb_irq_free(ab);
kfree(ab);
return err;
}
static int __devexit ab5500_usb_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver ab5500_usb_driver = {
.driver = {
.name = "ab5500-usb",
.owner = THIS_MODULE,
},
.probe = ab5500_usb_probe,
.remove = __devexit_p(ab5500_usb_remove),
};
static int __init ab5500_usb_init(void)
{
return platform_driver_register(&ab5500_usb_driver);
}
subsys_initcall(ab5500_usb_init);
static void __exit ab5500_usb_exit(void)
{
platform_driver_unregister(&ab5500_usb_driver);
}
module_exit(ab5500_usb_exit);
MODULE_LICENSE("GPL v2");
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