// SPDX-License-Identifier: GPL-2.0+
/*
* USB transceiver driver for AB8500 family chips
*
* Copyright (C) 2010-2013 ST-Ericsson AB
* Mian Yousaf Kaukab <[email protected]>
* Avinash Kumar <[email protected]>
* Thirupathi Chippakurthy <[email protected]>
*/
#include <linux/module.h>
#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.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/usb/musb-ux500.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/consumer.h>
/* Bank AB8500_SYS_CTRL2_BLOCK */
#define AB8500_MAIN_WD_CTRL_REG 0x01
/* Bank AB8500_USB */
#define AB8500_USB_LINE_STAT_REG 0x80
#define AB8505_USB_LINE_STAT_REG 0x94
#define AB8500_USB_PHY_CTRL_REG 0x8A
/* Bank AB8500_DEVELOPMENT */
#define AB8500_BANK12_ACCESS 0x00
/* Bank AB8500_DEBUG */
#define AB8500_USB_PHY_TUNE1 0x05
#define AB8500_USB_PHY_TUNE2 0x06
#define AB8500_USB_PHY_TUNE3 0x07
/* Bank AB8500_INTERRUPT */
#define AB8500_IT_SOURCE2_REG 0x01
#define AB8500_BIT_OTG_STAT_ID (1 << 0)
#define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
#define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
#define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
#define AB8500_BIT_WD_CTRL_KICK (1 << 1)
#define AB8500_BIT_SOURCE2_VBUSDET (1 << 7)
#define AB8500_WD_KICK_DELAY_US 100 /* usec */
#define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
#define AB8500_V20_31952_DISABLE_DELAY_US 100 /* usec */
/* Usb line status register */
enum ab8500_usb_link_status {
USB_LINK_NOT_CONFIGURED_8500 = 0,
USB_LINK_STD_HOST_NC_8500,
USB_LINK_STD_HOST_C_NS_8500,
USB_LINK_STD_HOST_C_S_8500,
USB_LINK_HOST_CHG_NM_8500,
USB_LINK_HOST_CHG_HS_8500,
USB_LINK_HOST_CHG_HS_CHIRP_8500,
USB_LINK_DEDICATED_CHG_8500,
USB_LINK_ACA_RID_A_8500,
USB_LINK_ACA_RID_B_8500,
USB_LINK_ACA_RID_C_NM_8500,
USB_LINK_ACA_RID_C_HS_8500,
USB_LINK_ACA_RID_C_HS_CHIRP_8500,
USB_LINK_HM_IDGND_8500,
USB_LINK_RESERVED_8500,
USB_LINK_NOT_VALID_LINK_8500,
};
enum ab8505_usb_link_status {
USB_LINK_NOT_CONFIGURED_8505 = 0,
USB_LINK_STD_HOST_NC_8505,
USB_LINK_STD_HOST_C_NS_8505,
USB_LINK_STD_HOST_C_S_8505,
USB_LINK_CDP_8505,
USB_LINK_RESERVED0_8505,
USB_LINK_RESERVED1_8505,
USB_LINK_DEDICATED_CHG_8505,
USB_LINK_ACA_RID_A_8505,
USB_LINK_ACA_RID_B_8505,
USB_LINK_ACA_RID_C_NM_8505,
USB_LINK_RESERVED2_8505,
USB_LINK_RESERVED3_8505,
USB_LINK_HM_IDGND_8505,
USB_LINK_CHARGERPORT_NOT_OK_8505,
USB_LINK_CHARGER_DM_HIGH_8505,
USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8505,
USB_LINK_STD_UPSTREAM_NO_IDGNG_NO_VBUS_8505,
USB_LINK_STD_UPSTREAM_8505,
USB_LINK_CHARGER_SE1_8505,
USB_LINK_CARKIT_CHGR_1_8505,
USB_LINK_CARKIT_CHGR_2_8505,
USB_LINK_ACA_DOCK_CHGR_8505,
USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8505,
USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8505,
USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505,
USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505,
USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
};
enum ab8500_usb_mode {
USB_IDLE = 0,
USB_PERIPHERAL,
USB_HOST,
USB_DEDICATED_CHG,
USB_UART
};
/* Register USB_LINK_STATUS interrupt */
#define AB8500_USB_FLAG_USE_LINK_STATUS_IRQ (1 << 0)
/* Register ID_WAKEUP_F interrupt */
#define AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ (1 << 1)
/* Register VBUS_DET_F interrupt */
#define AB8500_USB_FLAG_USE_VBUS_DET_IRQ (1 << 2)
/* Driver is using the ab-iddet driver*/
#define AB8500_USB_FLAG_USE_AB_IDDET (1 << 3)
/* Enable setting regulators voltage */
#define AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE (1 << 4)
struct ab8500_usb {
struct usb_phy phy;
struct device *dev;
struct ab8500 *ab8500;
unsigned vbus_draw;
struct work_struct phy_dis_work;
enum ab8500_usb_mode mode;
struct clk *sysclk;
struct regulator *v_ape;
struct regulator *v_musb;
struct regulator *v_ulpi;
int saved_v_ulpi;
int previous_link_status_state;
struct pinctrl *pinctrl;
struct pinctrl_state *pins_sleep;
bool enabled_charging_detection;
unsigned int flags;
};
static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x)
{
return container_of(x, struct ab8500_usb, phy);
}
static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
{
abx500_set_register_interruptible(ab->dev,
AB8500_SYS_CTRL2_BLOCK,
AB8500_MAIN_WD_CTRL_REG,
AB8500_BIT_WD_CTRL_ENABLE);
udelay(AB8500_WD_KICK_DELAY_US);
abx500_set_register_interruptible(ab->dev,
AB8500_SYS_CTRL2_BLOCK,
AB8500_MAIN_WD_CTRL_REG,
(AB8500_BIT_WD_CTRL_ENABLE
| AB8500_BIT_WD_CTRL_KICK));
udelay(AB8500_WD_V11_DISABLE_DELAY_US);
abx500_set_register_interruptible(ab->dev,
AB8500_SYS_CTRL2_BLOCK,
AB8500_MAIN_WD_CTRL_REG,
0);
}
static void ab8500_usb_regulator_enable(struct ab8500_usb *ab)
{
int ret, volt;
ret = regulator_enable(ab->v_ape);
if (ret)
dev_err(ab->dev, "Failed to enable v-ape\n");
if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
ab->saved_v_ulpi = regulator_get_voltage(ab->v_ulpi);
if (ab->saved_v_ulpi < 0)
dev_err(ab->dev, "Failed to get v_ulpi voltage\n");
ret = regulator_set_voltage(ab->v_ulpi, 1300000, 1350000);
if (ret < 0)
dev_err(ab->dev, "Failed to set the Vintcore to 1.3V, ret=%d\n",
ret);
ret = regulator_set_load(ab->v_ulpi, 28000);
if (ret < 0)
dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
ret);
}
ret = regulator_enable(ab->v_ulpi);
if (ret)
dev_err(ab->dev, "Failed to enable vddulpivio18\n");
if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
volt = regulator_get_voltage(ab->v_ulpi);
if ((volt != 1300000) && (volt != 1350000))
dev_err(ab->dev, "Vintcore is not set to 1.3V volt=%d\n",
volt);
}
ret = regulator_enable(ab->v_musb);
if (ret)
dev_err(ab->dev, "Failed to enable musb_1v8\n");
}
static void ab8500_usb_regulator_disable(struct ab8500_usb *ab)
{
int ret;
regulator_disable(ab->v_musb);
regulator_disable(ab->v_ulpi);
/* USB is not the only consumer of Vintcore, restore old settings */
if (ab->flags & AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE) {
if (ab->saved_v_ulpi > 0) {
ret = regulator_set_voltage(ab->v_ulpi,
ab->saved_v_ulpi, ab->saved_v_ulpi);
if (ret < 0)
dev_err(ab->dev, "Failed to set the Vintcore to %duV, ret=%d\n",
ab->saved_v_ulpi, ret);
}
ret = regulator_set_load(ab->v_ulpi, 0);
if (ret < 0)
dev_err(ab->dev, "Failed to set optimum mode (ret=%d)\n",
ret);
}
regulator_disable(ab->v_ape);
}
static void ab8500_usb_wd_linkstatus(struct ab8500_usb *ab, u8 bit)
{
/* Workaround for v2.0 bug # 31952 */
if (is_ab8500_2p0(ab->ab8500)) {
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
bit, bit);
udelay(AB8500_V20_31952_DISABLE_DELAY_US);
}
}
static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
{
u8 bit;
bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
AB8500_BIT_PHY_CTRL_DEVICE_EN;
/* mux and configure USB pins to DEFAULT state */
ab->pinctrl = pinctrl_get_select(ab->dev, PINCTRL_STATE_DEFAULT);
if (IS_ERR(ab->pinctrl))
dev_err(ab->dev, "could not get/set default pinstate\n");
if (clk_prepare_enable(ab->sysclk))
dev_err(ab->dev, "can't prepare/enable clock\n");
ab8500_usb_regulator_enable(ab);
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
bit, bit);
}
static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
{
u8 bit;
bit = sel_host ? AB8500_BIT_PHY_CTRL_HOST_EN :
AB8500_BIT_PHY_CTRL_DEVICE_EN;
ab8500_usb_wd_linkstatus(ab, bit);
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
bit, 0);
/* Needed to disable the phy.*/
ab8500_usb_wd_workaround(ab);
clk_disable_unprepare(ab->sysclk);
ab8500_usb_regulator_disable(ab);
if (!IS_ERR(ab->pinctrl)) {
/* configure USB pins to SLEEP state */
ab->pins_sleep = pinctrl_lookup_state(ab->pinctrl,
PINCTRL_STATE_SLEEP);
if (IS_ERR(ab->pins_sleep))
dev_dbg(ab->dev, "could not get sleep pinstate\n");
else if (pinctrl_select_state(ab->pinctrl, ab->pins_sleep))
dev_err(ab->dev, "could not set pins to sleep state\n");
/*
* as USB pins are shared with iddet, release them to allow
* iddet to request them
*/
pinctrl_put(ab->pinctrl);
}
}
#define ab8500_usb_host_phy_en(ab) ab8500_usb_phy_enable(ab, true)
#define ab8500_usb_host_phy_dis(ab) ab8500_usb_phy_disable(ab, true)
#define ab8500_usb_peri_phy_en(ab) ab8500_usb_phy_enable(ab, false)
#define ab8500_usb_peri_phy_dis(ab) ab8500_usb_phy_disable(ab, false)
static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
enum ab8505_usb_link_status lsts)
{
enum ux500_musb_vbus_id_status event = 0;
dev_dbg(ab->dev, "ab8505_usb_link_status_update %d\n", lsts);
/*
* Spurious link_status interrupts are seen at the time of
* disconnection of a device in RIDA state
*/
if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8505 &&
(lsts == USB_LINK_STD_HOST_NC_8505))
return 0;
ab->previous_link_status_state = lsts;
switch (lsts) {
case USB_LINK_ACA_RID_B_8505:
event = UX500_MUSB_RIDB;
fallthrough;
case USB_LINK_NOT_CONFIGURED_8505:
case USB_LINK_RESERVED0_8505:
case USB_LINK_RESERVED1_8505:
case USB_LINK_RESERVED2_8505:
case USB_LINK_RESERVED3_8505:
ab->mode = USB_IDLE;
ab->phy.otg->default_a = false;
ab->vbus_draw = 0;
if (event != UX500_MUSB_RIDB)
event = UX500_MUSB_NONE;
/*
* Fallback to default B_IDLE as nothing
* is connected
*/
ab->phy.otg->state = OTG_STATE_B_IDLE;
usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
break;
case USB_LINK_ACA_RID_C_NM_8505:
event = UX500_MUSB_RIDC;
fallthrough;
case USB_LINK_STD_HOST_NC_8505:
case USB_LINK_STD_HOST_C_NS_8505:
case USB_LINK_STD_HOST_C_S_8505:
case USB_LINK_CDP_8505:
if (ab->mode == USB_IDLE) {
ab->mode = USB_PERIPHERAL;
ab8500_usb_peri_phy_en(ab);
atomic_notifier_call_chain(&ab->phy.notifier,
UX500_MUSB_PREPARE, &ab->vbus_draw);
usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
}
if (event != UX500_MUSB_RIDC)
event = UX500_MUSB_VBUS;
break;
case USB_LINK_ACA_RID_A_8505:
case USB_LINK_ACA_DOCK_CHGR_8505:
event = UX500_MUSB_RIDA;
fallthrough;
case USB_LINK_HM_IDGND_8505:
if (ab->mode == USB_IDLE) {
ab->mode = USB_HOST;
ab8500_usb_host_phy_en(ab);
atomic_notifier_call_chain(&ab->phy.notifier,
UX500_MUSB_PREPARE, &ab->vbus_draw);
}
ab->phy.otg->default_a = true;
if (event != UX500_MUSB_RIDA)
event = UX500_MUSB_ID;
atomic_notifier_call_chain(&ab->phy.notifier,
event, &ab->vbus_draw);
break;
case USB_LINK_DEDICATED_CHG_8505:
ab->mode = USB_DEDICATED_CHG;
event = UX500_MUSB_CHARGER;
atomic_notifier_call_chain(&ab->phy.notifier,
event, &ab->vbus_draw);
usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
break;
/*
* FIXME: For now we rely on the boot firmware to set up the necessary
* PHY/pin configuration for UART mode.
*
* AB8505 does not seem to report any status change for UART cables,
* possibly because it cannot detect them autonomously.
* We may need to measure the ID resistance manually to reliably
* detect UART cables after bootup.
*/
case USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8505:
case USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8505:
if (ab->mode == USB_IDLE) {
ab->mode = USB_UART;
ab8500_usb_peri_phy_en(ab);
}
break;
default:
break;
}
return 0;
}
static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
enum ab8500_usb_link_status lsts)
{
enum ux500_musb_vbus_id_status event = 0;
dev_dbg(ab->dev, "ab8500_usb_link_status_update %d\n", lsts);
/*
* Spurious link_status interrupts are seen in case of a
* disconnection of a device in IDGND and RIDA stage
*/
if (ab->previous_link_status_state == USB_LINK_HM_IDGND_8500 &&
(lsts == USB_LINK_STD_HOST_C_NS_8500 ||
lsts == USB_LINK_STD_HOST_NC_8500))
return 0;
if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8500 &&
lsts == USB_LINK_STD_HOST_NC_8500)
return 0;
ab->previous_link_status_state = lsts;
switch (lsts) {
case USB_LINK_ACA_RID_B_8500:
event = UX500_MUSB_RIDB;
fallthrough;
case USB_LINK_NOT_CONFIGURED_8500:
case USB_LINK_NOT_VALID_LINK_8500:
ab->mode = USB_IDLE;
ab->phy.otg->default_a = false;
ab->vbus_draw = 0;
if (event != UX500_MUSB_RIDB)
event = UX500_MUSB_NONE;
/* Fallback to default B_IDLE as nothing is connected */
ab->phy.otg->state = OTG_STATE_B_IDLE;
usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
break;
case USB_LINK_ACA_RID_C_NM_8500:
case USB_LINK_ACA_RID_C_HS_8500:
case USB_LINK_ACA_RID_C_HS_CHIRP_8500:
event = UX500_MUSB_RIDC;
fallthrough;
case USB_LINK_STD_HOST_NC_8500:
case USB_LINK_STD_HOST_C_NS_8500:
case USB_LINK_STD_HOST_C_S_8500:
case USB_LINK_HOST_CHG_NM_8500:
case USB_LINK_HOST_CHG_HS_8500:
case USB_LINK_HOST_CHG_HS_CHIRP_8500:
if (ab->mode == USB_IDLE) {
ab->mode = USB_PERIPHERAL;
ab8500_usb_peri_phy_en(ab);
atomic_notifier_call_chain(&ab->phy.notifier,
UX500_MUSB_PREPARE, &ab->vbus_draw);
usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
}
if (event != UX500_MUSB_RIDC)
event = UX500_MUSB_VBUS;
break;
case USB_LINK_ACA_RID_A_8500:
event = UX500_MUSB_RIDA;
fallthrough;
case USB_LINK_HM_IDGND_8500:
if (ab->mode == USB_IDLE) {
ab->mode = USB_HOST;
ab8500_usb_host_phy_en(ab);
atomic_notifier_call_chain(&ab->phy.notifier,
UX500_MUSB_PREPARE, &ab->vbus_draw);
}
ab->phy.otg->default_a = true;
if (event != UX500_MUSB_RIDA)
event = UX500_MUSB_ID;
atomic_notifier_call_chain(&ab->phy.notifier,
event, &ab->vbus_draw);
break;
case USB_LINK_DEDICATED_CHG_8500:
ab->mode = USB_DEDICATED_CHG;
event = UX500_MUSB_CHARGER;
atomic_notifier_call_chain(&ab->phy.notifier,
event, &ab->vbus_draw);
usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
break;
case USB_LINK_RESERVED_8500:
break;
}
return 0;
}
/*
* Connection Sequence:
* 1. Link Status Interrupt
* 2. Enable AB clock
* 3. Enable AB regulators
* 4. Enable USB phy
* 5. Reset the musb controller
* 6. Switch the ULPI GPIO pins to function mode
* 7. Enable the musb Peripheral5 clock
* 8. Restore MUSB context
*/
static int abx500_usb_link_status_update(struct ab8500_usb *ab)
{
u8 reg;
int ret = 0;
if (is_ab8500(ab->ab8500)) {
enum ab8500_usb_link_status lsts;
ret = abx500_get_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_LINE_STAT_REG, ®);
if (ret < 0)
return ret;
lsts = (reg >> 3) & 0x0F;
ret = ab8500_usb_link_status_update(ab, lsts);
} else if (is_ab8505(ab->ab8500)) {
enum ab8505_usb_link_status lsts;
ret = abx500_get_register_interruptible(ab->dev,
AB8500_USB, AB8505_USB_LINE_STAT_REG, ®);
if (ret < 0)
return ret;
lsts = (reg >> 3) & 0x1F;
ret = ab8505_usb_link_status_update(ab, lsts);
}
return ret;
}
/*
* Disconnection Sequence:
* 1. Disconnect Interrupt
* 2. Disable regulators
* 3. Disable AB clock
* 4. Disable the Phy
* 5. Link Status Interrupt
* 6. Disable Musb Clock
*/
static irqreturn_t ab8500_usb_disconnect_irq(int irq, void *data)
{
struct ab8500_usb *ab = (struct ab8500_usb *) data;
enum usb_phy_events event = USB_EVENT_NONE;
/* Link status will not be updated till phy is disabled. */
if (ab->mode == USB_HOST) {
ab->phy.otg->default_a = false;
ab->vbus_draw = 0;
atomic_notifier_call_chain(&ab->phy.notifier,
event, &ab->vbus_draw);
ab8500_usb_host_phy_dis(ab);
ab->mode = USB_IDLE;
}
if (ab->mode == USB_PERIPHERAL) {
atomic_notifier_call_chain(&ab->phy.notifier,
event, &ab->vbus_draw);
ab8500_usb_peri_phy_dis(ab);
atomic_notifier_call_chain(&ab->phy.notifier,
UX500_MUSB_CLEAN, &ab->vbus_draw);
ab->mode = USB_IDLE;
ab->phy.otg->default_a = false;
ab->vbus_draw = 0;
}
if (ab->mode == USB_UART) {
ab8500_usb_peri_phy_dis(ab);
ab->mode = USB_IDLE;
}
if (is_ab8500_2p0(ab->ab8500)) {
if (ab->mode == USB_DEDICATED_CHG) {
ab8500_usb_wd_linkstatus(ab,
AB8500_BIT_PHY_CTRL_DEVICE_EN);
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
AB8500_BIT_PHY_CTRL_DEVICE_EN, 0);
}
}
return IRQ_HANDLED;
}
static irqreturn_t ab8500_usb_link_status_irq(int irq, void *data)
{
struct ab8500_usb *ab = (struct ab8500_usb *)data;
abx500_usb_link_status_update(ab);
return IRQ_HANDLED;
}
static void ab8500_usb_phy_disable_work(struct work_struct *work)
{
struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
phy_dis_work);
if (!ab->phy.otg->host)
ab8500_usb_host_phy_dis(ab);
if (!ab->phy.otg->gadget)
ab8500_usb_peri_phy_dis(ab);
}
static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend)
{
/* TODO */
return 0;
}
static int ab8500_usb_set_peripheral(struct usb_otg *otg,
struct usb_gadget *gadget)
{
struct ab8500_usb *ab;
if (!otg)
return -ENODEV;
ab = phy_to_ab(otg->usb_phy);
ab->phy.otg->gadget = gadget;
/* Some drivers call this function in atomic context.
* Do not update ab8500 registers directly till this
* is fixed.
*/
if ((ab->mode != USB_IDLE) && !gadget) {
ab->mode = USB_IDLE;
schedule_work(&ab->phy_dis_work);
}
return 0;
}
static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
{
struct ab8500_usb *ab;
if (!otg)
return -ENODEV;
ab = phy_to_ab(otg->usb_phy);
ab->phy.otg->host = host;
/* Some drivers call this function in atomic context.
* Do not update ab8500 registers directly till this
* is fixed.
*/
if ((ab->mode != USB_IDLE) && !host) {
ab->mode = USB_IDLE;
schedule_work(&ab->phy_dis_work);
}
return 0;
}
static void ab8500_usb_restart_phy(struct ab8500_usb *ab)
{
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
AB8500_BIT_PHY_CTRL_DEVICE_EN,
AB8500_BIT_PHY_CTRL_DEVICE_EN);
udelay(100);
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
AB8500_BIT_PHY_CTRL_DEVICE_EN,
0);
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
AB8500_BIT_PHY_CTRL_HOST_EN,
AB8500_BIT_PHY_CTRL_HOST_EN);
udelay(100);
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
AB8500_BIT_PHY_CTRL_HOST_EN,
0);
}
static int ab8500_usb_regulator_get(struct ab8500_usb *ab)
{
int err;
ab->v_ape = devm_regulator_get(ab->dev, "v-ape");
if (IS_ERR(ab->v_ape)) {
dev_err(ab->dev, "Could not get v-ape supply\n");
err = PTR_ERR(ab->v_ape);
return err;
}
ab->v_ulpi = devm_regulator_get(ab->dev, "vddulpivio18");
if (IS_ERR(ab->v_ulpi)) {
dev_err(ab->dev, "Could not get vddulpivio18 supply\n");
err = PTR_ERR(ab->v_ulpi);
return err;
}
ab->v_musb = devm_regulator_get(ab->dev, "musb_1v8");
if (IS_ERR(ab->v_musb)) {
dev_err(ab->dev, "Could not get musb_1v8 supply\n");
err = PTR_ERR(ab->v_musb);
return err;
}
return 0;
}
static int ab8500_usb_irq_setup(struct platform_device *pdev,
struct ab8500_usb *ab)
{
int err;
int irq;
if (ab->flags & AB8500_USB_FLAG_USE_LINK_STATUS_IRQ) {
irq = platform_get_irq_byname(pdev, "USB_LINK_STATUS");
if (irq < 0)
return irq;
err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
ab8500_usb_link_status_irq,
IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
"usb-link-status", ab);
if (err < 0) {
dev_err(ab->dev, "request_irq failed for link status irq\n");
return err;
}
}
if (ab->flags & AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ) {
irq = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
if (irq < 0)
return irq;
err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
ab8500_usb_disconnect_irq,
IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
"usb-id-fall", ab);
if (err < 0) {
dev_err(ab->dev, "request_irq failed for ID fall irq\n");
return err;
}
}
if (ab->flags & AB8500_USB_FLAG_USE_VBUS_DET_IRQ) {
irq = platform_get_irq_byname(pdev, "VBUS_DET_F");
if (irq < 0)
return irq;
err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
ab8500_usb_disconnect_irq,
IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
"usb-vbus-fall", ab);
if (err < 0) {
dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
return err;
}
}
return 0;
}
static void ab8500_usb_set_ab8500_tuning_values(struct ab8500_usb *ab)
{
int err;
/* Enable the PBT/Bank 0x12 access */
err = abx500_set_register_interruptible(ab->dev,
AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
if (err < 0)
dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
err);
err = abx500_set_register_interruptible(ab->dev,
AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
err);
err = abx500_set_register_interruptible(ab->dev,
AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
err);
err = abx500_set_register_interruptible(ab->dev,
AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE3 register err=%d\n",
err);
/* Switch to normal mode/disable Bank 0x12 access */
err = abx500_set_register_interruptible(ab->dev,
AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
if (err < 0)
dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
err);
}
static void ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb *ab)
{
int err;
/* Enable the PBT/Bank 0x12 access */
err = abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
0x01, 0x01);
if (err < 0)
dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
err);
err = abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
0xC8, 0xC8);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
err);
err = abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
0x60, 0x60);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
err);
err = abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
0xFC, 0x80);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE3 register err=%d\n",
err);
/* Switch to normal mode/disable Bank 0x12 access */
err = abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
0x00, 0x00);
if (err < 0)
dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
err);
}
static int ab8500_usb_probe(struct platform_device *pdev)
{
struct ab8500_usb *ab;
struct ab8500 *ab8500;
struct usb_otg *otg;
int err;
int rev;
ab8500 = dev_get_drvdata(pdev->dev.parent);
rev = abx500_get_chip_id(&pdev->dev);
if (is_ab8500_1p1_or_earlier(ab8500)) {
dev_err(&pdev->dev, "Unsupported AB8500 chip rev=%d\n", rev);
return -ENODEV;
}
ab = devm_kzalloc(&pdev->dev, sizeof(*ab), GFP_KERNEL);
if (!ab)
return -ENOMEM;
otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
if (!otg)
return -ENOMEM;
ab->dev = &pdev->dev;
ab->ab8500 = ab8500;
ab->phy.dev = ab->dev;
ab->phy.otg = otg;
ab->phy.label = "ab8500";
ab->phy.set_suspend = ab8500_usb_set_suspend;
ab->phy.otg->state = OTG_STATE_UNDEFINED;
otg->usb_phy = &ab->phy;
otg->set_host = ab8500_usb_set_host;
otg->set_peripheral = ab8500_usb_set_peripheral;
if (is_ab8500(ab->ab8500)) {
ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
} else if (is_ab8505(ab->ab8500)) {
ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
}
/* Disable regulator voltage setting for AB8500 <= v2.0 */
if (is_ab8500_2p0_or_earlier(ab->ab8500))
ab->flags &= ~AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
platform_set_drvdata(pdev, ab);
/* all: Disable phy when called from set_host and set_peripheral */
INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
err = ab8500_usb_regulator_get(ab);
if (err)
return err;
ab->sysclk = devm_clk_get(ab->dev, "sysclk");
if (IS_ERR(ab->sysclk)) {
dev_err(ab->dev, "Could not get sysclk.\n");
return PTR_ERR(ab->sysclk);
}
err = ab8500_usb_irq_setup(pdev, ab);
if (err < 0)
return err;
err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2);
if (err) {
dev_err(&pdev->dev, "Can't register transceiver\n");
return err;
}
if (is_ab8500(ab->ab8500) && !is_ab8500_2p0_or_earlier(ab->ab8500))
/* Phy tuning values for AB8500 > v2.0 */
ab8500_usb_set_ab8500_tuning_values(ab);
else if (is_ab8505(ab->ab8500))
/* Phy tuning values for AB8505 */
ab8500_usb_set_ab8505_tuning_values(ab);
/* Needed to enable ID detection. */
ab8500_usb_wd_workaround(ab);
/*
* This is required for usb-link-status to work properly when a
* cable is connected at boot time.
*/
ab8500_usb_restart_phy(ab);
abx500_usb_link_status_update(ab);
dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
return 0;
}
static void ab8500_usb_remove(struct platform_device *pdev)
{
struct ab8500_usb *ab = platform_get_drvdata(pdev);
cancel_work_sync(&ab->phy_dis_work);
usb_remove_phy(&ab->phy);
if (ab->mode == USB_HOST)
ab8500_usb_host_phy_dis(ab);
else if (ab->mode == USB_PERIPHERAL)
ab8500_usb_peri_phy_dis(ab);
}
static const struct platform_device_id ab8500_usb_devtype[] = {
{ .name = "ab8500-usb", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, ab8500_usb_devtype);
static struct platform_driver ab8500_usb_driver = {
.probe = ab8500_usb_probe,
.remove_new = ab8500_usb_remove,
.id_table = ab8500_usb_devtype,
.driver = {
.name = "abx5x0-usb",
},
};
static int __init ab8500_usb_init(void)
{
return platform_driver_register(&ab8500_usb_driver);
}
subsys_initcall(ab8500_usb_init);
static void __exit ab8500_usb_exit(void)
{
platform_driver_unregister(&ab8500_usb_driver);
}
module_exit(ab8500_usb_exit);
MODULE_AUTHOR("ST-Ericsson AB");
MODULE_DESCRIPTION("AB8500 family usb transceiver driver");
MODULE_LICENSE("GPL");
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