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Commit 0c380c0e authored by Fabio Baltieri's avatar Fabio Baltieri Committed by Felipe Balbi
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usb: phy: ab8500-usb: add ab8540 support



Add support for the ab8540 variant of the ab8500 family.

Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarMaxime Coquelin <maxime.coquelin@st.com>
Cc: Avinash Kumar <avinash.kumar@stericsson.com>
Signed-off-by: default avatarFabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent bd4c9f02
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+294 −3
Original line number Diff line number Diff line
/*
 * 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");