drivers/phy/qcom/phy-qcom-qusb2.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2023 Bhupesh Sharma <bhupesh.sharma@linaro.org>
 *
 * Based on Linux driver
 */

#include <common.h>
#include <dm.h>
#include <generic-phy.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <reset.h>
#include <clk.h>
#include <linux/delay.h>

#include <dt-bindings/phy/phy-qcom-qusb2.h>

#define QUSB2PHY_PLL			0x0
#define QUSB2PHY_PLL_TEST		0x04
#define CLK_REF_SEL			BIT(7)

#define QUSB2PHY_PLL_TUNE		0x08
#define QUSB2PHY_PLL_USER_CTL1		0x0c
#define QUSB2PHY_PLL_USER_CTL2		0x10
#define QUSB2PHY_PLL_AUTOPGM_CTL1	0x1c
#define QUSB2PHY_PLL_PWR_CTRL		0x18

/* QUSB2PHY_PLL_STATUS register bits */
#define PLL_LOCKED			BIT(5)

/* QUSB2PHY_PLL_COMMON_STATUS_ONE register bits */
#define CORE_READY_STATUS		BIT(0)

/* QUSB2PHY_PORT_POWERDOWN register bits */
#define CLAMP_N_EN			BIT(5)
#define FREEZIO_N			BIT(1)
#define POWER_DOWN			BIT(0)

/* QUSB2PHY_PWR_CTRL1 register bits */
#define PWR_CTRL1_VREF_SUPPLY_TRIM	BIT(5)
#define PWR_CTRL1_CLAMP_N_EN		BIT(1)

#define QUSB2PHY_REFCLK_ENABLE		BIT(0)

#define PHY_CLK_SCHEME_SEL		BIT(0)

/* QUSB2PHY_INTR_CTRL register bits */
#define DMSE_INTR_HIGH_SEL			BIT(4)
#define DPSE_INTR_HIGH_SEL			BIT(3)
#define CHG_DET_INTR_EN				BIT(2)
#define DMSE_INTR_EN				BIT(1)
#define DPSE_INTR_EN				BIT(0)

/* QUSB2PHY_PLL_CORE_INPUT_OVERRIDE register bits */
#define CORE_PLL_EN_FROM_RESET			BIT(4)
#define CORE_RESET				BIT(5)
#define CORE_RESET_MUX				BIT(6)

/* QUSB2PHY_IMP_CTRL1 register bits */
#define IMP_RES_OFFSET_MASK			GENMASK(5, 0)
#define IMP_RES_OFFSET_SHIFT			0x0

/* QUSB2PHY_PLL_BIAS_CONTROL_2 register bits */
#define BIAS_CTRL2_RES_OFFSET_MASK		GENMASK(5, 0)
#define BIAS_CTRL2_RES_OFFSET_SHIFT		0x0

/* QUSB2PHY_CHG_CONTROL_2 register bits */
#define CHG_CTRL2_OFFSET_MASK			GENMASK(5, 4)
#define CHG_CTRL2_OFFSET_SHIFT			0x4

/* QUSB2PHY_PORT_TUNE1 register bits */
#define HSTX_TRIM_MASK				GENMASK(7, 4)
#define HSTX_TRIM_SHIFT				0x4
#define PREEMPH_WIDTH_HALF_BIT			BIT(2)
#define PREEMPHASIS_EN_MASK			GENMASK(1, 0)
#define PREEMPHASIS_EN_SHIFT			0x0

/* QUSB2PHY_PORT_TUNE2 register bits */
#define HSDISC_TRIM_MASK			GENMASK(1, 0)
#define HSDISC_TRIM_SHIFT			0x0

#define QUSB2PHY_PLL_ANALOG_CONTROLS_TWO	0x04
#define QUSB2PHY_PLL_CLOCK_INVERTERS		0x18c
#define QUSB2PHY_PLL_CMODE			0x2c
#define QUSB2PHY_PLL_LOCK_DELAY			0x184
#define QUSB2PHY_PLL_DIGITAL_TIMERS_TWO		0xb4
#define QUSB2PHY_PLL_BIAS_CONTROL_1		0x194
#define QUSB2PHY_PLL_BIAS_CONTROL_2		0x198
#define QUSB2PHY_PWR_CTRL2			0x214
#define QUSB2PHY_IMP_CTRL1			0x220
#define QUSB2PHY_IMP_CTRL2			0x224
#define QUSB2PHY_CHG_CTRL2			0x23c

struct qusb2_phy_init_tbl {
	unsigned int offset;
	unsigned int val;
	/*
	 * register part of layout ?
	 * if yes, then offset gives index in the reg-layout
	 */
	int in_layout;
};

struct qusb2_phy_cfg {
	const struct qusb2_phy_init_tbl *tbl;
	/* number of entries in the table */
	unsigned int tbl_num;
	/* offset to PHY_CLK_SCHEME register in TCSR map */
	unsigned int clk_scheme_offset;

	/* array of registers with different offsets */
	const unsigned int *regs;
	unsigned int mask_core_ready;
	unsigned int disable_ctrl;
	unsigned int autoresume_en;

	/* true if PHY has PLL_TEST register to select clk_scheme */
	bool has_pll_test;

	/* true if TUNE1 register must be updated by fused value, else TUNE2 */
	bool update_tune1_with_efuse;

	/* true if PHY has PLL_CORE_INPUT_OVERRIDE register to reset PLL */
	bool has_pll_override;
};

/* set of registers with offsets different per-PHY */
enum qusb2phy_reg_layout {
	QUSB2PHY_PLL_CORE_INPUT_OVERRIDE,
	QUSB2PHY_PLL_STATUS,
	QUSB2PHY_PORT_TUNE1,
	QUSB2PHY_PORT_TUNE2,
	QUSB2PHY_PORT_TUNE3,
	QUSB2PHY_PORT_TUNE4,
	QUSB2PHY_PORT_TUNE5,
	QUSB2PHY_PORT_TEST1,
	QUSB2PHY_PORT_TEST2,
	QUSB2PHY_PORT_POWERDOWN,
	QUSB2PHY_INTR_CTRL,
};

#define QUSB2_PHY_INIT_CFG(o, v) \
	{			\
		.offset = o,	\
		.val = v,	\
	}

#define QUSB2_PHY_INIT_CFG_L(o, v) \
	{			\
		.offset = o,	\
		.val = v,	\
		.in_layout = 1,	\
	}

static const struct qusb2_phy_init_tbl sm6115_init_tbl[] = {
	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE1, 0xf8),
	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE2, 0x53),
	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE3, 0x81),
	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE4, 0x17),

	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_TUNE, 0x30),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_USER_CTL1, 0x79),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_USER_CTL2, 0x21),

	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TEST2, 0x14),

	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_AUTOPGM_CTL1, 0x9f),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_PWR_CTRL, 0x00),
};

static const unsigned int sm6115_regs_layout[] = {
	[QUSB2PHY_PLL_STATUS]		= 0x38,
	[QUSB2PHY_PORT_TUNE1]		= 0x80,
	[QUSB2PHY_PORT_TUNE2]		= 0x84,
	[QUSB2PHY_PORT_TUNE3]		= 0x88,
	[QUSB2PHY_PORT_TUNE4]		= 0x8c,
	[QUSB2PHY_PORT_TUNE5]		= 0x90,
	[QUSB2PHY_PORT_TEST1]		= 0xb8,
	[QUSB2PHY_PORT_TEST2]		= 0x9c,
	[QUSB2PHY_PORT_POWERDOWN]	= 0xb4,
	[QUSB2PHY_INTR_CTRL]		= 0xbc,
};

static const struct qusb2_phy_init_tbl qusb2_v2_init_tbl[] = {
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_ANALOG_CONTROLS_TWO, 0x03),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CLOCK_INVERTERS, 0x7c),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CMODE, 0x80),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_LOCK_DELAY, 0x0a),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_DIGITAL_TIMERS_TWO, 0x19),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_BIAS_CONTROL_1, 0x40),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_BIAS_CONTROL_2, 0x20),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_PWR_CTRL2, 0x21),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_IMP_CTRL1, 0x0),
	QUSB2_PHY_INIT_CFG(QUSB2PHY_IMP_CTRL2, 0x58),

	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE1, 0x30),
	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE2, 0x29),
	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE3, 0xca),
	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE4, 0x04),
	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE5, 0x03),

	QUSB2_PHY_INIT_CFG(QUSB2PHY_CHG_CTRL2, 0x0),
};

static const unsigned int qusb2_v2_regs_layout[] = {
	[QUSB2PHY_PLL_CORE_INPUT_OVERRIDE] = 0xa8,
	[QUSB2PHY_PLL_STATUS]		= 0x1a0,
	[QUSB2PHY_PORT_TUNE1]		= 0x240,
	[QUSB2PHY_PORT_TUNE2]		= 0x244,
	[QUSB2PHY_PORT_TUNE3]		= 0x248,
	[QUSB2PHY_PORT_TUNE4]		= 0x24c,
	[QUSB2PHY_PORT_TUNE5]		= 0x250,
	[QUSB2PHY_PORT_TEST1]		= 0x254,
	[QUSB2PHY_PORT_TEST2]		= 0x258,
	[QUSB2PHY_PORT_POWERDOWN]	= 0x210,
	[QUSB2PHY_INTR_CTRL]		= 0x230,
};

static const struct qusb2_phy_cfg sm6115_phy_cfg = {
	.tbl		= sm6115_init_tbl,
	.tbl_num	= ARRAY_SIZE(sm6115_init_tbl),
	.regs		= sm6115_regs_layout,

	.has_pll_test	= true,
	.disable_ctrl	= (CLAMP_N_EN | FREEZIO_N | POWER_DOWN),
	.mask_core_ready = PLL_LOCKED,
	.autoresume_en	 = BIT(3),
};

static const struct qusb2_phy_cfg qusb2_v2_phy_cfg = {
	.tbl		= qusb2_v2_init_tbl,
	.tbl_num	= ARRAY_SIZE(qusb2_v2_init_tbl),
	.regs		= qusb2_v2_regs_layout,

	.disable_ctrl	= (PWR_CTRL1_VREF_SUPPLY_TRIM | PWR_CTRL1_CLAMP_N_EN |
			   POWER_DOWN),
	.mask_core_ready = CORE_READY_STATUS,
	.has_pll_override = true,
	.autoresume_en	  = BIT(0),
	.update_tune1_with_efuse = true,
};

/**
 * struct qusb2_phy - structure holding qusb2 phy attributes
 *
 * @phy: generic phy
 * @base: iomapped memory space for qubs2 phy
 *
 * @cfg_ahb_clk: AHB2PHY interface clock
 * @ref_clk: phy reference clock
 * @iface_clk: phy interface clock
 * @phy_rst: phy reset control
 *
 * @cfg: phy config data
 * @has_se_clk_scheme: indicate if PHY has single-ended ref clock scheme
 */
struct qusb2_phy {
	struct phy *phy;
	void __iomem *base;

	struct clk *cfg_ahb_clk;
	struct clk *ref_clk;
	struct clk *iface_clk;
	struct clk_bulk clks;
	struct reset_ctl phy_rst;

	const struct qusb2_phy_cfg *cfg;
	bool has_se_clk_scheme;
};

static inline void qusb2_write_mask(void __iomem *base, u32 offset,
				    u32 val, u32 mask)
{
	u32 reg;

	reg = readl(base + offset);
	reg &= ~mask;
	reg |= val & mask;
	writel(reg, base + offset);

	/* Ensure above write is completed */
	readl(base + offset);
}

static inline void qusb2_setbits(void __iomem *base, u32 offset, u32 val)
{
	u32 reg;

	reg = readl(base + offset);
	reg |= val;
	writel(reg, base + offset);

	/* Ensure above write is completed */
	readl(base + offset);
}

static inline void qusb2_clrbits(void __iomem *base, u32 offset, u32 val)
{
	u32 reg;

	reg = readl(base + offset);
	reg &= ~val;
	writel(reg, base + offset);

	/* Ensure above write is completed */
	readl(base + offset);
}

static inline
void qusb2_phy_configure(void __iomem *base,
			      const unsigned int *regs,
			      const struct qusb2_phy_init_tbl tbl[], int num)
{
	int i;

	for (i = 0; i < num; i++) {
		if (tbl[i].in_layout)
			writel(tbl[i].val, base + regs[tbl[i].offset]);
		else
			writel(tbl[i].val, base + tbl[i].offset);
	}
}

static int qusb2phy_do_reset(struct qusb2_phy *qphy)
{
	int ret;

	ret = reset_assert(&qphy->phy_rst);
	if (ret)
		return ret;

	udelay(10);

	ret = reset_deassert(&qphy->phy_rst);
	if (ret)
		return ret;

	return 0;
}

static int qusb2phy_power_on(struct phy *phy)
{
	struct qusb2_phy *qphy = dev_get_priv(phy->dev);
	const struct qusb2_phy_cfg *cfg = qphy->cfg;
	int ret;
	u32 val;

	ret = qusb2phy_do_reset(qphy);
	if (ret)
		return ret;

	/* Disable the PHY */
	qusb2_setbits(qphy->base, cfg->regs[QUSB2PHY_PORT_POWERDOWN],
		      qphy->cfg->disable_ctrl);

	if (cfg->has_pll_test) {
		/* save reset value to override reference clock scheme later */
		val = readl(qphy->base + QUSB2PHY_PLL_TEST);
	}

	qusb2_phy_configure(qphy->base, cfg->regs, cfg->tbl,
				 cfg->tbl_num);

	/* Enable the PHY */
	qusb2_clrbits(qphy->base, cfg->regs[QUSB2PHY_PORT_POWERDOWN],
		      POWER_DOWN);

	/* Required to get phy pll lock successfully */
	udelay(150);

	if (cfg->has_pll_test) {
		val |= CLK_REF_SEL;

		writel(val, qphy->base + QUSB2PHY_PLL_TEST);

		/* ensure above write is through */
		readl(qphy->base + QUSB2PHY_PLL_TEST);
	}

	/* Required to get phy pll lock successfully */
	udelay(100);

	val = readb(qphy->base + cfg->regs[QUSB2PHY_PLL_STATUS]);
	if (!(val & cfg->mask_core_ready)) {
		pr_err("QUSB2PHY pll lock failed: status reg = %x\n", val);
		ret = -EBUSY;
		return ret;
	}

	return 0;
}

static int qusb2phy_power_off(struct phy *phy)
{
	struct qusb2_phy *qphy = dev_get_priv(phy->dev);

	/* Disable the PHY */
	qusb2_setbits(qphy->base, qphy->cfg->regs[QUSB2PHY_PORT_POWERDOWN],
		      qphy->cfg->disable_ctrl);

	reset_assert(&qphy->phy_rst);

	clk_disable_bulk(&qphy->clks);
	clk_release_bulk(&qphy->clks);

	return 0;
}

static int qusb2phy_clk_init(struct udevice *dev, struct qusb2_phy *qphy)
{
	int ret;

	ret = clk_get_bulk(dev, &qphy->clks);
	if (ret == -ENOSYS || ret == -ENOENT)
		return 0;
	if (ret)
		return ret;

	ret = clk_enable_bulk(&qphy->clks);
	if (ret) {
		clk_release_bulk(&qphy->clks);
		return ret;
	}

	return 0;
}

static int qusb2phy_probe(struct udevice *dev)
{
	struct qusb2_phy *qphy = dev_get_priv(dev);
	int ret;

	qphy->base = (void __iomem *)dev_read_addr(dev);
	if (IS_ERR(qphy->base))
		return PTR_ERR(qphy->base);

	ret = qusb2phy_clk_init(dev, qphy);
	if (ret)
		return ret;

	ret = reset_get_by_index(dev, 0, &qphy->phy_rst);
	if (ret)
		return ret;

	qphy->cfg = (const struct qusb2_phy_cfg *)dev_get_driver_data(dev);
	if (!qphy->cfg)
		return -EINVAL;

	return 0;
}

static struct phy_ops qusb2phy_ops = {
	.power_on = qusb2phy_power_on,
	.power_off = qusb2phy_power_off,
};

static const struct udevice_id qusb2phy_ids[] = {
	{ .compatible = "qcom,qusb2-phy" },
	{ .compatible = "qcom,sm6115-qusb2-phy", .data = (ulong)&sm6115_phy_cfg },
	{ .compatible = "qcom,qusb2-v2-phy", .data = (ulong)&qusb2_v2_phy_cfg },
	{ }
};

U_BOOT_DRIVER(qcom_qusb2_phy) = {
	.name		= "qcom-qusb2-phy",
	.id		= UCLASS_PHY,
	.of_match	= qusb2phy_ids,
	.ops		= &qusb2phy_ops,
	.probe		= qusb2phy_probe,
	.priv_auto	= sizeof(struct qusb2_phy),
};