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usb: phy: ab8500-usb: add ab8540 support 

Add support for the ab8540 variant of the ab8500 family.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Cc: Avinash Kumar <avinash.kumar@stericsson.com>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Fabio Baltieri 2013-05-15 14:03:32 +02:00 committed by Felipe Balbi
parent bd4c9f0278
commit 0c380c0ee0
1 changed files with 294 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

297
drivers/usb/phy/phy-ab8500-usb.c
View File

@ -1,10 +1,11 @@
/*
* drivers/usb/otg/ab8500_usb.c
*
* USB transceiver driver for AB8500 chip
* USB transceiver driver for AB8500 family chips
*
* Copyright (C) 2010 ST-Ericsson AB
* Copyright (C) 2010-2013 ST-Ericsson AB
* Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
* Avinash Kumar <avinash.kumar@stericsson.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -43,21 +44,33 @@
/* Bank AB8500_USB */
#define AB8500_USB_LINE_STAT_REG 0x80
#define AB8505_USB_LINE_STAT_REG 0x94
#define AB8540_USB_LINK_STAT_REG 0x94
#define AB8540_USB_OTG_CTL_REG 0x87
#define AB8500_USB_PHY_CTRL_REG 0x8A
#define AB8540_VBUS_CTRL_REG 0x82
/* Bank AB8500_DEVELOPMENT */
#define AB8500_BANK12_ACCESS 0x00
/* Bank AB8500_DEBUG */
#define AB8540_DEBUG 0x32
#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 AB8540_BIT_OTG_CTL_VBUS_VALID_ENA (1 << 0)
#define AB8540_BIT_OTG_CTL_ID_HOST_ENA (1 << 1)
#define AB8540_BIT_OTG_CTL_ID_DEV_ENA (1 << 5)
#define AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA (1 << 0)
#define AB8500_WD_KICK_DELAY_US 100 /* usec */
#define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
@ -114,6 +127,37 @@ enum ab8505_usb_link_status {
USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8505,
};
enum ab8540_usb_link_status {
USB_LINK_NOT_CONFIGURED_8540 = 0,
USB_LINK_STD_HOST_NC_8540,
USB_LINK_STD_HOST_C_NS_8540,
USB_LINK_STD_HOST_C_S_8540,
USB_LINK_CDP_8540,
USB_LINK_RESERVED0_8540,
USB_LINK_RESERVED1_8540,
USB_LINK_DEDICATED_CHG_8540,
USB_LINK_ACA_RID_A_8540,
USB_LINK_ACA_RID_B_8540,
USB_LINK_ACA_RID_C_NM_8540,
USB_LINK_RESERVED2_8540,
USB_LINK_RESERVED3_8540,
USB_LINK_HM_IDGND_8540,
USB_LINK_CHARGERPORT_NOT_OK_8540,
USB_LINK_CHARGER_DM_HIGH_8540,
USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540,
USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_8540,
USB_LINK_STD_UPSTREAM_8540,
USB_LINK_CHARGER_SE1_8540,
USB_LINK_CARKIT_CHGR_1_8540,
USB_LINK_CARKIT_CHGR_2_8540,
USB_LINK_ACA_DOCK_CHGR_8540,
USB_LINK_SAMSUNG_BOOT_CBL_PHY_EN_8540,
USB_LINK_SAMSUNG_BOOT_CBL_PHY_DISB_8540,
USB_LINK_SAMSUNG_UART_CBL_PHY_EN_8540,
USB_LINK_SAMSUNG_UART_CBL_PHY_DISB_8540,
USB_LINK_MOTOROLA_FACTORY_CBL_PHY_EN_8540
};
enum ab8500_usb_mode {
USB_IDLE = 0,
USB_PERIPHERAL,
@ -131,6 +175,10 @@ enum ab8500_usb_mode {
#define AB8500_USB_FLAG_USE_AB_IDDET (1 << 3)
/* Enable setting regulators voltage */
#define AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE (1 << 4)
/* Enable the check_vbus_status workaround */
#define AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS (1 << 5)
/* Enable the vbus host workaround */
#define AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK (1 << 6)
struct ab8500_usb {
struct usb_phy phy;
@ -138,6 +186,7 @@ struct ab8500_usb {
struct ab8500 *ab8500;
unsigned vbus_draw;
struct work_struct phy_dis_work;
struct work_struct vbus_event_work;
enum ab8500_usb_mode mode;
struct clk *sysclk;
struct regulator *v_ape;
@ -147,6 +196,7 @@ struct ab8500_usb {
int previous_link_status_state;
struct pinctrl *pinctrl;
struct pinctrl_state *pins_sleep;
bool enabled_charging_detection;
unsigned int flags;
};
@ -275,6 +325,15 @@ static void ab8500_usb_phy_enable(struct ab8500_usb *ab, bool sel_host)
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8500_USB_PHY_CTRL_REG,
bit, bit);
if (ab->flags & AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK) {
if (sel_host)
abx500_set_register_interruptible(ab->dev,
AB8500_USB, AB8540_USB_OTG_CTL_REG,
AB8540_BIT_OTG_CTL_VBUS_VALID_ENA |
AB8540_BIT_OTG_CTL_ID_HOST_ENA |
AB8540_BIT_OTG_CTL_ID_DEV_ENA);
}
}
static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
@ -319,6 +378,128 @@ static void ab8500_usb_phy_disable(struct ab8500_usb *ab, bool sel_host)
#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 ab8540_usb_link_status_update(struct ab8500_usb *ab,
enum ab8540_usb_link_status lsts)
{
enum ux500_musb_vbus_id_status event = 0;
dev_dbg(ab->dev, "ab8540_usb_link_status_update %d\n", lsts);
if (ab->enabled_charging_detection) {
/* Disable USB Charger detection */
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8540_VBUS_CTRL_REG,
AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA, 0x00);
ab->enabled_charging_detection = false;
}
/*
* 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_8540 &&
(lsts == USB_LINK_STD_HOST_C_NS_8540 ||
lsts == USB_LINK_STD_HOST_NC_8540))
return 0;
if (ab->previous_link_status_state == USB_LINK_ACA_RID_A_8540 &&
(lsts == USB_LINK_STD_HOST_NC_8540))
return 0;
ab->previous_link_status_state = lsts;
switch (lsts) {
case USB_LINK_ACA_RID_B_8540:
event = UX500_MUSB_RIDB;
case USB_LINK_NOT_CONFIGURED_8540:
case USB_LINK_RESERVED0_8540:
case USB_LINK_RESERVED1_8540:
case USB_LINK_RESERVED2_8540:
case USB_LINK_RESERVED3_8540:
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.state = OTG_STATE_B_IDLE;
break;
case USB_LINK_ACA_RID_C_NM_8540:
event = UX500_MUSB_RIDC;
case USB_LINK_STD_HOST_NC_8540:
case USB_LINK_STD_HOST_C_NS_8540:
case USB_LINK_STD_HOST_C_S_8540:
case USB_LINK_CDP_8540:
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);
}
if (event != UX500_MUSB_RIDC)
event = UX500_MUSB_VBUS;
break;
case USB_LINK_ACA_RID_A_8540:
case USB_LINK_ACA_DOCK_CHGR_8540:
event = UX500_MUSB_RIDA;
case USB_LINK_HM_IDGND_8540:
case USB_LINK_STD_UPSTREAM_8540:
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_8540:
ab->mode = USB_DEDICATED_CHG;
event = UX500_MUSB_CHARGER;
atomic_notifier_call_chain(&ab->phy.notifier,
event, &ab->vbus_draw);
break;
case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540:
case USB_LINK_STD_UPSTREAM_NO_IDGNG_VBUS_8540:
event = UX500_MUSB_NONE;
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;
}
break;
default:
event = UX500_MUSB_NONE;
break;
}
return 0;
}
static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
enum ab8505_usb_link_status lsts)
{
@ -519,6 +700,13 @@ static int abx500_usb_link_status_update(struct ab8500_usb *ab)
AB8500_USB, AB8505_USB_LINE_STAT_REG, &reg);
lsts = (reg >> 3) & 0x1F;
ret = ab8505_usb_link_status_update(ab, lsts);
} else if (is_ab8540(ab->ab8500)) {
enum ab8540_usb_link_status lsts;
abx500_get_register_interruptible(ab->dev,
AB8500_USB, AB8540_USB_LINK_STAT_REG, &reg);
lsts = (reg >> 3) & 0xFF;
ret = ab8540_usb_link_status_update(ab, lsts);
}
return ret;
@ -593,6 +781,69 @@ static void ab8500_usb_phy_disable_work(struct work_struct *work)
ab8500_usb_peri_phy_dis(ab);
}
/* Check if VBUS is set and linkstatus has not detected a cable. */
static bool ab8500_usb_check_vbus_status(struct ab8500_usb *ab)
{
u8 isource2;
u8 reg;
enum ab8540_usb_link_status lsts;
abx500_get_register_interruptible(ab->dev,
AB8500_INTERRUPT, AB8500_IT_SOURCE2_REG,
&isource2);
/* If Vbus is below 3.6V abort */
if (!(isource2 & AB8500_BIT_SOURCE2_VBUSDET))
return false;
abx500_get_register_interruptible(ab->dev,
AB8500_USB, AB8540_USB_LINK_STAT_REG,
&reg);
lsts = (reg >> 3) & 0xFF;
/* Check if linkstatus has detected a cable */
if (lsts)
return false;
return true;
}
/* re-trigger charger detection again with watchdog re-kick. */
static void ab8500_usb_vbus_turn_on_event_work(struct work_struct *work)
{
struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
vbus_event_work);
if (ab->mode != USB_IDLE)
return;
abx500_set_register_interruptible(ab->dev,
AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
AB8500_BIT_WD_CTRL_ENABLE);
udelay(100);
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(100);
/* Disable Main watchdog */
abx500_set_register_interruptible(ab->dev,
AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WD_CTRL_REG,
0x0);
/* Enable USB Charger detection */
abx500_mask_and_set_register_interruptible(ab->dev,
AB8500_USB, AB8540_VBUS_CTRL_REG,
AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA,
AB8540_BIT_VBUS_CTRL_CHARG_DET_ENA);
ab->enabled_charging_detection = true;
}
static unsigned ab8500_eyediagram_workaroud(struct ab8500_usb *ab, unsigned mA)
{
/*
@ -872,6 +1123,29 @@ static void ab8500_usb_set_ab8505_tuning_values(struct ab8500_usb *ab)
err);
}
static void ab8500_usb_set_ab8540_tuning_values(struct ab8500_usb *ab)
{
int err;
err = abx500_set_register_interruptible(ab->dev,
AB8540_DEBUG, AB8500_USB_PHY_TUNE1, 0xCC);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE1 register ret=%d\n",
err);
err = abx500_set_register_interruptible(ab->dev,
AB8540_DEBUG, AB8500_USB_PHY_TUNE2, 0x60);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE2 register ret=%d\n",
err);
err = abx500_set_register_interruptible(ab->dev,
AB8540_DEBUG, AB8500_USB_PHY_TUNE3, 0x90);
if (err < 0)
dev_err(ab->dev, "Failed to set PHY_TUNE3 regester ret=%d\n",
err);
}
static int ab8500_usb_probe(struct platform_device *pdev)
{
struct ab8500_usb *ab;
@ -919,6 +1193,11 @@ static int ab8500_usb_probe(struct platform_device *pdev)
AB8500_USB_FLAG_USE_ID_WAKEUP_IRQ |
AB8500_USB_FLAG_USE_VBUS_DET_IRQ |
AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
} else if (is_ab8540(ab->ab8500)) {
ab->flags |= AB8500_USB_FLAG_USE_LINK_STATUS_IRQ |
AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS |
AB8500_USB_FLAG_USE_VBUS_HOST_QUIRK |
AB8500_USB_FLAG_REGULATOR_SET_VOLTAGE;
}
/* Disable regulator voltage setting for AB8500 <= v2.0 */
@ -932,6 +1211,8 @@ static int ab8500_usb_probe(struct platform_device *pdev)
/* all: Disable phy when called from set_host and set_peripheral */
INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
INIT_WORK(&ab->vbus_event_work, ab8500_usb_vbus_turn_on_event_work);
err = ab8500_usb_regulator_get(ab);
if (err)
return err;
@ -958,6 +1239,9 @@ static int ab8500_usb_probe(struct platform_device *pdev)
else if (is_ab8505(ab->ab8500))
/* Phy tuning values for AB8505 */
ab8500_usb_set_ab8505_tuning_values(ab);
else if (is_ab8540(ab->ab8500))
/* Phy tuning values for AB8540 */
ab8500_usb_set_ab8540_tuning_values(ab);
/* Needed to enable ID detection. */
ab8500_usb_wd_workaround(ab);
@ -968,6 +1252,11 @@ static int ab8500_usb_probe(struct platform_device *pdev)
*/
ab8500_usb_restart_phy(ab);
if (ab->flags & AB8500_USB_FLAG_USE_CHECK_VBUS_STATUS) {
if (ab8500_usb_check_vbus_status(ab))
schedule_work(&ab->vbus_event_work);
}
abx500_usb_link_status_update(ab);
dev_info(&pdev->dev, "revision 0x%2x driver initialized\n", rev);
@ -980,6 +1269,7 @@ static int ab8500_usb_remove(struct platform_device *pdev)
struct ab8500_usb *ab = platform_get_drvdata(pdev);
cancel_work_sync(&ab->phy_dis_work);
cancel_work_sync(&ab->vbus_event_work);
usb_remove_phy(&ab->phy);
@ -993,6 +1283,7 @@ static int ab8500_usb_remove(struct platform_device *pdev)
static struct platform_device_id ab8500_usb_devtype[] = {
{ .name = "ab8500-usb", },
{ .name = "ab8540-usb", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, ab8500_usb_devtype);
@ -1020,5 +1311,5 @@ static void __exit ab8500_usb_exit(void)
module_exit(ab8500_usb_exit);
MODULE_AUTHOR("ST-Ericsson AB");
MODULE_DESCRIPTION("AB8500 usb transceiver driver");
MODULE_DESCRIPTION("AB8500 family usb transceiver driver");
MODULE_LICENSE("GPL");