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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

drivers/usb/phy/phy-ab8500-usb.c

+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");