[J-u-boot.git] / drivers / phy / omap-usb2-phy.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * OMAP USB2 PHY LAYER
 *
 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
 * Written by Jean-Jacques Hiblot <[email protected]>
 */

#include <common.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <dm.h>
#include <errno.h>
#include <generic-phy.h>
#include <regmap.h>
#include <soc.h>
#include <syscon.h>
#include <linux/bitops.h>
#include <linux/err.h>

#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT	BIT(0)
#define OMAP_USB2_DISABLE_CHG_DET		BIT(1)

#define OMAP_DEV_PHY_PD		BIT(0)
#define OMAP_USB2_PHY_PD	BIT(28)

#define AM437X_USB2_PHY_PD		BIT(0)
#define AM437X_USB2_OTG_PD		BIT(1)
#define AM437X_USB2_OTGVDET_EN		BIT(19)
#define AM437X_USB2_OTGSESSEND_EN	BIT(20)

#define USB2PHY_DISCON_BYP_LATCH	BIT(31)
#define USB2PHY_ANA_CONFIG1		(0x4c)

#define AM654_USB2_OTG_PD		BIT(8)
#define AM654_USB2_VBUS_DET_EN		BIT(5)
#define AM654_USB2_VBUSVALID_DET_EN	BIT(4)

#define USB2PHY_CHRG_DET		 0x14
#define USB2PHY_USE_CHG_DET_REG		BIT(29)
#define USB2PHY_DIS_CHG_DET		BIT(28)

DECLARE_GLOBAL_DATA_PTR;

struct omap_usb2_phy {
	struct regmap *pwr_regmap;
	ulong flags;
	void *phy_base;
	u32 pwr_reg_offset;
};

struct usb_phy_data {
	const char *label;
	u8 flags;
	u32 mask;
	u32 power_on;
	u32 power_off;
};

static const struct usb_phy_data omap5_usb2_data = {
	.label = "omap5_usb2",
	.flags = 0,
	.mask = OMAP_DEV_PHY_PD,
	.power_off = OMAP_DEV_PHY_PD,
};

static const struct usb_phy_data dra7x_usb2_data = {
	.label = "dra7x_usb2",
	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	.mask = OMAP_DEV_PHY_PD,
	.power_off = OMAP_DEV_PHY_PD,
};

static const struct usb_phy_data dra7x_usb2_phy2_data = {
	.label = "dra7x_usb2_phy2",
	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	.mask = OMAP_USB2_PHY_PD,
	.power_off = OMAP_USB2_PHY_PD,
};

static const struct usb_phy_data am437x_usb2_data = {
	.label = "am437x_usb2",
	.flags =  0,
	.mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
		AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
	.power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
	.power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
};

static const struct usb_phy_data am654_usb2_data = {
	.label = "am654_usb2",
	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	.mask = AM654_USB2_OTG_PD | AM654_USB2_VBUS_DET_EN |
		AM654_USB2_VBUSVALID_DET_EN,
	.power_on = AM654_USB2_VBUS_DET_EN | AM654_USB2_VBUSVALID_DET_EN,
	.power_off = AM654_USB2_OTG_PD,
};

static const struct udevice_id omap_usb2_id_table[] = {
	{
		.compatible = "ti,omap5-usb2",
		.data = (ulong)&omap5_usb2_data,
	},
	{
		.compatible = "ti,dra7x-usb2",
		.data = (ulong)&dra7x_usb2_data,
	},
	{
		.compatible = "ti,dra7x-usb2-phy2",
		.data = (ulong)&dra7x_usb2_phy2_data,
	},
	{
		.compatible = "ti,am437x-usb2",
		.data = (ulong)&am437x_usb2_data,
	},
	{
		.compatible = "ti,am654-usb2",
		.data = (ulong)&am654_usb2_data,
	},
	{},
};

static int omap_usb_phy_power(struct phy *usb_phy, bool on)
{
	struct udevice *dev = usb_phy->dev;
	const struct usb_phy_data *data;
	const struct omap_usb2_phy *phy = dev_get_priv(dev);
	u32 val;
	int rc;

	data = (const struct usb_phy_data *)dev_get_driver_data(dev);
	if (!data)
		return -EINVAL;

	rc = regmap_read(phy->pwr_regmap, phy->pwr_reg_offset, &val);
	if (rc)
		return rc;
	val &= ~data->mask;
	if (on)
		val |= data->power_on;
	else
		val |= data->power_off;
	rc = regmap_write(phy->pwr_regmap, phy->pwr_reg_offset, val);
	if (rc)
		return rc;

	return 0;
}

static int omap_usb2_phy_init(struct phy *usb_phy)
{
	struct udevice *dev = usb_phy->dev;
	struct omap_usb2_phy *priv = dev_get_priv(dev);
	u32 val;

	if (priv->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
		/*
		 *
		 * Reduce the sensitivity of internal PHY by enabling the
		 * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
		 * resolves issues with certain devices which can otherwise
		 * be prone to false disconnects.
		 *
		 */
		val = readl(priv->phy_base + USB2PHY_ANA_CONFIG1);
		val |= USB2PHY_DISCON_BYP_LATCH;
		writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
	}

	if (priv->flags & OMAP_USB2_DISABLE_CHG_DET) {
		val = readl(priv->phy_base + USB2PHY_CHRG_DET);
		val |= USB2PHY_USE_CHG_DET_REG | USB2PHY_DIS_CHG_DET;
		writel(val, priv->phy_base + USB2PHY_CHRG_DET);
	}

	return 0;
}

static int omap_usb2_phy_power_on(struct phy *usb_phy)
{
	return omap_usb_phy_power(usb_phy, true);
}

static int omap_usb2_phy_power_off(struct phy *usb_phy)
{
	return omap_usb_phy_power(usb_phy, false);
}

static int omap_usb2_phy_exit(struct phy *usb_phy)
{
	return omap_usb_phy_power(usb_phy, false);
}

struct phy_ops omap_usb2_phy_ops = {
	.init = omap_usb2_phy_init,
	.power_on = omap_usb2_phy_power_on,
	.power_off = omap_usb2_phy_power_off,
	.exit = omap_usb2_phy_exit,
};

static const struct soc_attr am65x_sr10_soc_devices[] = {
	{ .family = "AM65X", .revision = "SR1.0" },
	{ /* sentinel */ }
};

int omap_usb2_phy_probe(struct udevice *dev)
{
	int rc;
	struct regmap *regmap;
	struct omap_usb2_phy *priv = dev_get_priv(dev);
	const struct usb_phy_data *data;
	u32 tmp[2];

	data = (const struct usb_phy_data *)dev_get_driver_data(dev);
	if (!data)
		return -EINVAL;

	priv->phy_base = dev_read_addr_ptr(dev);

	if (!priv->phy_base)
		return -EINVAL;

	if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT)
		priv->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;

	/*
	 * AM654x PG1.0 has a silicon bug that D+ is pulled high after
	 * POR, which could cause enumeration failure with some USB hubs.
	 * Disabling the USB2_PHY Charger Detect function will put D+
	 * into the normal state.
	 *
	 * Enable this workaround for AM654x PG1.0.
	 */
	if (soc_device_match(am65x_sr10_soc_devices))
		priv->flags |= OMAP_USB2_DISABLE_CHG_DET;

	regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
	if (!IS_ERR(regmap)) {
		priv->pwr_regmap = regmap;
		rc =  dev_read_u32_array(dev, "syscon-phy-power", tmp, 2);
		if (rc) {
			printf("couldn't get power reg. offset (err %d)\n", rc);
			return rc;
		}
		priv->pwr_reg_offset = tmp[1];
		return 0;
	}
	regmap = syscon_regmap_lookup_by_phandle(dev, "ctrl-module");
	if (!IS_ERR(regmap)) {
		priv->pwr_regmap = regmap;
		priv->pwr_reg_offset = 0;
		return 0;
	}

	printf("can't get regmap (err %ld)\n", PTR_ERR(regmap));
	return PTR_ERR(regmap);
}

U_BOOT_DRIVER(omap_usb2_phy) = {
	.name = "omap_usb2_phy",
	.id = UCLASS_PHY,
	.of_match = omap_usb2_id_table,
	.probe = omap_usb2_phy_probe,
	.ops = &omap_usb2_phy_ops,
	.priv_auto	= sizeof(struct omap_usb2_phy),
};
Commit	Line	Data
668257e0 JJH	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* OMAP USB2 PHY LAYER
	4	*
	5	* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
	6	* Written by Jean-Jacques Hiblot <[email protected]>
	7	*/
	8
	9	#include <common.h>
401d1c4f	10	#include <asm/global_data.h>
668257e0 JJH	11	#include <asm/io.h>
	12	#include <dm.h>
	13	#include <errno.h>
	14	#include <generic-phy.h>
	15	#include <regmap.h>
555ee394	16	#include <soc.h>
668257e0	17	#include <syscon.h>
cd93d625	18	#include <linux/bitops.h>
61b29b82	19	#include <linux/err.h>
668257e0 JJH	20
668257e0 JJH	21	#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT BIT(0)
5b9ee0fc	22	#define OMAP_USB2_DISABLE_CHG_DET BIT(1)
668257e0 JJH	23
	24	#define OMAP_DEV_PHY_PD BIT(0)
	25	#define OMAP_USB2_PHY_PD BIT(28)
	26
512a84c4 JJH	27	#define AM437X_USB2_PHY_PD BIT(0)
	28	#define AM437X_USB2_OTG_PD BIT(1)
	29	#define AM437X_USB2_OTGVDET_EN BIT(19)
	30	#define AM437X_USB2_OTGSESSEND_EN BIT(20)
	31
668257e0 JJH	32	#define USB2PHY_DISCON_BYP_LATCH BIT(31)
	33	#define USB2PHY_ANA_CONFIG1 (0x4c)
	34
779f40bf VR	35	#define AM654_USB2_OTG_PD BIT(8)
	36	#define AM654_USB2_VBUS_DET_EN BIT(5)
	37	#define AM654_USB2_VBUSVALID_DET_EN BIT(4)
	38
5b9ee0fc BL	39	#define USB2PHY_CHRG_DET 0x14
	40	#define USB2PHY_USE_CHG_DET_REG BIT(29)
	41	#define USB2PHY_DIS_CHG_DET BIT(28)
	42
668257e0 JJH	43	DECLARE_GLOBAL_DATA_PTR;
	44
	45	struct omap_usb2_phy {
	46	struct regmap *pwr_regmap;
	47	ulong flags;
	48	void *phy_base;
	49	u32 pwr_reg_offset;
	50	};
	51
	52	struct usb_phy_data {
	53	const char *label;
	54	u8 flags;
	55	u32 mask;
	56	u32 power_on;
	57	u32 power_off;
	58	};
	59
	60	static const struct usb_phy_data omap5_usb2_data = {
	61	.label = "omap5_usb2",
	62	.flags = 0,
	63	.mask = OMAP_DEV_PHY_PD,
	64	.power_off = OMAP_DEV_PHY_PD,
	65	};
	66
	67	static const struct usb_phy_data dra7x_usb2_data = {
	68	.label = "dra7x_usb2",
	69	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	70	.mask = OMAP_DEV_PHY_PD,
	71	.power_off = OMAP_DEV_PHY_PD,
	72	};
	73
	74	static const struct usb_phy_data dra7x_usb2_phy2_data = {
	75	.label = "dra7x_usb2_phy2",
	76	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	77	.mask = OMAP_USB2_PHY_PD,
	78	.power_off = OMAP_USB2_PHY_PD,
	79	};
	80
512a84c4 JJH	81	static const struct usb_phy_data am437x_usb2_data = {
	82	.label = "am437x_usb2",
	83	.flags = 0,
	84	.mask = AM437X_USB2_PHY_PD \| AM437X_USB2_OTG_PD \|
	85	AM437X_USB2_OTGVDET_EN \| AM437X_USB2_OTGSESSEND_EN,
	86	.power_on = AM437X_USB2_OTGVDET_EN \| AM437X_USB2_OTGSESSEND_EN,
	87	.power_off = AM437X_USB2_PHY_PD \| AM437X_USB2_OTG_PD,
	88	};
	89
779f40bf VR	90	static const struct usb_phy_data am654_usb2_data = {
	91	.label = "am654_usb2",
	92	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	93	.mask = AM654_USB2_OTG_PD \| AM654_USB2_VBUS_DET_EN \|
	94	AM654_USB2_VBUSVALID_DET_EN,
	95	.power_on = AM654_USB2_VBUS_DET_EN \| AM654_USB2_VBUSVALID_DET_EN,
	96	.power_off = AM654_USB2_OTG_PD,
	97	};
	98
668257e0 JJH	99	static const struct udevice_id omap_usb2_id_table[] = {
	100	{
	101	.compatible = "ti,omap5-usb2",
	102	.data = (ulong)&omap5_usb2_data,
	103	},
	104	{
	105	.compatible = "ti,dra7x-usb2",
	106	.data = (ulong)&dra7x_usb2_data,
	107	},
	108	{
	109	.compatible = "ti,dra7x-usb2-phy2",
	110	.data = (ulong)&dra7x_usb2_phy2_data,
	111	},
512a84c4 JJH	112	{
	113	.compatible = "ti,am437x-usb2",
	114	.data = (ulong)&am437x_usb2_data,
	115	},
779f40bf VR	116	{
	117	.compatible = "ti,am654-usb2",
	118	.data = (ulong)&am654_usb2_data,
	119	},
668257e0 JJH	120	{},
	121	};
	122
	123	static int omap_usb_phy_power(struct phy *usb_phy, bool on)
	124	{
	125	struct udevice *dev = usb_phy->dev;
	126	const struct usb_phy_data *data;
	127	const struct omap_usb2_phy *phy = dev_get_priv(dev);
	128	u32 val;
	129	int rc;
	130
	131	data = (const struct usb_phy_data *)dev_get_driver_data(dev);
	132	if (!data)
	133	return -EINVAL;
	134
	135	rc = regmap_read(phy->pwr_regmap, phy->pwr_reg_offset, &val);
	136	if (rc)
	137	return rc;
	138	val &= ~data->mask;
	139	if (on)
	140	val \|= data->power_on;
	141	else
	142	val \|= data->power_off;
	143	rc = regmap_write(phy->pwr_regmap, phy->pwr_reg_offset, val);
	144	if (rc)
	145	return rc;
	146
	147	return 0;
	148	}
	149
	150	static int omap_usb2_phy_init(struct phy *usb_phy)
	151	{
	152	struct udevice *dev = usb_phy->dev;
	153	struct omap_usb2_phy *priv = dev_get_priv(dev);
	154	u32 val;
	155
	156	if (priv->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
	157	/*
	158	*
	159	* Reduce the sensitivity of internal PHY by enabling the
	160	* DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
	161	* resolves issues with certain devices which can otherwise
	162	* be prone to false disconnects.
	163	*
	164	*/
	165	val = readl(priv->phy_base + USB2PHY_ANA_CONFIG1);
	166	val \|= USB2PHY_DISCON_BYP_LATCH;
	167	writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
	168	}
	169
5b9ee0fc BL	170	if (priv->flags & OMAP_USB2_DISABLE_CHG_DET) {
	171	val = readl(priv->phy_base + USB2PHY_CHRG_DET);
	172	val \|= USB2PHY_USE_CHG_DET_REG \| USB2PHY_DIS_CHG_DET;
	173	writel(val, priv->phy_base + USB2PHY_CHRG_DET);
	174	}
	175
668257e0 JJH	176	return 0;
	177	}
	178
	179	static int omap_usb2_phy_power_on(struct phy *usb_phy)
	180	{
	181	return omap_usb_phy_power(usb_phy, true);
	182	}
	183
	184	static int omap_usb2_phy_power_off(struct phy *usb_phy)
	185	{
	186	return omap_usb_phy_power(usb_phy, false);
	187	}
	188
	189	static int omap_usb2_phy_exit(struct phy *usb_phy)
	190	{
	191	return omap_usb_phy_power(usb_phy, false);
	192	}
	193
	194	struct phy_ops omap_usb2_phy_ops = {
	195	.init = omap_usb2_phy_init,
	196	.power_on = omap_usb2_phy_power_on,
	197	.power_off = omap_usb2_phy_power_off,
	198	.exit = omap_usb2_phy_exit,
	199	};
	200
555ee394 VR	201	static const struct soc_attr am65x_sr10_soc_devices[] = {
	202	{ .family = "AM65X", .revision = "SR1.0" },
	203	{ /* sentinel */ }
	204	};
	205
668257e0 JJH	206	int omap_usb2_phy_probe(struct udevice *dev)
	207	{
	208	int rc;
	209	struct regmap *regmap;
	210	struct omap_usb2_phy *priv = dev_get_priv(dev);
	211	const struct usb_phy_data *data;
	212	u32 tmp[2];
	213
	214	data = (const struct usb_phy_data *)dev_get_driver_data(dev);
	215	if (!data)
	216	return -EINVAL;
	217
5b9ee0fc	218	priv->phy_base = dev_read_addr_ptr(dev);
668257e0	219
5b9ee0fc BL	220	if (!priv->phy_base)
	221	return -EINVAL;
	222
	223	if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT)
668257e0	224	priv->flags \|= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
5b9ee0fc BL	225
	226	/*
	227	* AM654x PG1.0 has a silicon bug that D+ is pulled high after
	228	* POR, which could cause enumeration failure with some USB hubs.
	229	* Disabling the USB2_PHY Charger Detect function will put D+
	230	* into the normal state.
	231	*
555ee394	232	* Enable this workaround for AM654x PG1.0.
5b9ee0fc	233	*/
555ee394	234	if (soc_device_match(am65x_sr10_soc_devices))
5b9ee0fc	235	priv->flags \|= OMAP_USB2_DISABLE_CHG_DET;
668257e0 JJH	236
668257e0 JJH	237	regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
512a84c4 JJH	238	if (!IS_ERR(regmap)) {
	239	priv->pwr_regmap = regmap;
	240	rc = dev_read_u32_array(dev, "syscon-phy-power", tmp, 2);
	241	if (rc) {
	242	printf("couldn't get power reg. offset (err %d)\n", rc);
	243	return rc;
	244	}
	245	priv->pwr_reg_offset = tmp[1];
	246	return 0;
668257e0	247	}
512a84c4 JJH	248	regmap = syscon_regmap_lookup_by_phandle(dev, "ctrl-module");
	249	if (!IS_ERR(regmap)) {
	250	priv->pwr_regmap = regmap;
	251	priv->pwr_reg_offset = 0;
	252	return 0;
668257e0	253	}
668257e0	254
512a84c4 JJH	255	printf("can't get regmap (err %ld)\n", PTR_ERR(regmap));
512a84c4 JJH	256	return PTR_ERR(regmap);
668257e0 JJH	257	}
	258
	259	U_BOOT_DRIVER(omap_usb2_phy) = {
	260	.name = "omap_usb2_phy",
	261	.id = UCLASS_PHY,
	262	.of_match = omap_usb2_id_table,
	263	.probe = omap_usb2_phy_probe,
	264	.ops = &omap_usb2_phy_ops,
41575d8e	265	.priv_auto = sizeof(struct omap_usb2_phy),
668257e0	266	};