drivers/phy/samsung/phy-gs101-ufs.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * UFS PHY driver data for Google Tensor gs101 SoC
 *
 * Copyright (C) 2024 Linaro Ltd
 * Author: Peter Griffin <peter.griffin@linaro.org>
 */

#include "phy-samsung-ufs.h"

#define TENSOR_GS101_PHY_CTRL		0x3ec8
#define TENSOR_GS101_PHY_CTRL_MASK	0x1
#define TENSOR_GS101_PHY_CTRL_EN	BIT(0)
#define PHY_GS101_LANE_OFFSET		0x200
#define TRSV_REG338			0x338
#define LN0_MON_RX_CAL_DONE		BIT(3)
#define TRSV_REG339			0x339
#define LN0_MON_RX_CDR_FLD_CK_MODE_DONE BIT(3)
#define TRSV_REG222			0x222
#define LN0_OVRD_RX_CDR_EN		BIT(4)
#define LN0_RX_CDR_EN			BIT(3)

#define PHY_PMA_TRSV_ADDR(reg, lane)	(PHY_APB_ADDR((reg) + \
					((lane) * PHY_GS101_LANE_OFFSET)))

#define PHY_TRSV_REG_CFG_GS101(o, v, d) \
	PHY_TRSV_REG_CFG_OFFSET(o, v, d, PHY_GS101_LANE_OFFSET)

/* Calibration for phy initialization */
static const struct samsung_ufs_phy_cfg tensor_gs101_pre_init_cfg[] = {
	PHY_COMN_REG_CFG(0x43, 0x10,  PWR_MODE_ANY),
	PHY_COMN_REG_CFG(0x3C, 0x14,  PWR_MODE_ANY),
	PHY_COMN_REG_CFG(0x46, 0x48,  PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x200, 0x00, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x201, 0x06, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x202, 0x06, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x203, 0x0a, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x204, 0x00, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x205, 0x11, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x207, 0x0c, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2E1, 0xc0, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x22D, 0xb8, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x234, 0x60, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x238, 0x13, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x239, 0x48, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x23A, 0x01, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x23B, 0x25, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x23C, 0x2a, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x23D, 0x01, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x23E, 0x13, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x23F, 0x13, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x240, 0x4a, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x243, 0x40, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x244, 0x02, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x25D, 0x00, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x25E, 0x3f, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x25F, 0xff, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x273, 0x33, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x274, 0x50, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x284, 0x02, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x285, 0x02, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2A2, 0x04, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x25D, 0x01, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2FA, 0x01, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x286, 0x03, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x287, 0x03, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x288, 0x03, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x289, 0x03, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2B3, 0x04, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2B6, 0x0b, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2B7, 0x0b, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2B8, 0x0b, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2B9, 0x0b, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2BA, 0x0b, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2BB, 0x06, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2BC, 0x06, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2BD, 0x06, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x29E, 0x06, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2E4, 0x1a, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2ED, 0x25, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x269, 0x1a, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x2F4, 0x2f, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x34B, 0x01, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x34C, 0x23, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x34D, 0x23, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x34E, 0x45, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x34F, 0x00, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x350, 0x31, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x351, 0x00, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x352, 0x02, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x353, 0x00, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x354, 0x01, PWR_MODE_ANY),
	PHY_COMN_REG_CFG(0x43, 0x18, PWR_MODE_ANY),
	PHY_COMN_REG_CFG(0x43, 0x00, PWR_MODE_ANY),
	END_UFS_PHY_CFG,
};

static const struct samsung_ufs_phy_cfg tensor_gs101_pre_pwr_hs_config[] = {
	PHY_TRSV_REG_CFG_GS101(0x369, 0x11, PWR_MODE_ANY),
	PHY_TRSV_REG_CFG_GS101(0x246, 0x03, PWR_MODE_ANY),
};

/* Calibration for HS mode series A/B */
static const struct samsung_ufs_phy_cfg tensor_gs101_post_pwr_hs_config[] = {
	PHY_COMN_REG_CFG(0x8, 0x60, PWR_MODE_PWM_ANY),
	PHY_TRSV_REG_CFG_GS101(0x222, 0x08, PWR_MODE_PWM_ANY),
	PHY_TRSV_REG_CFG_GS101(0x246, 0x01, PWR_MODE_ANY),
	END_UFS_PHY_CFG,
};

static const struct samsung_ufs_phy_cfg *tensor_gs101_ufs_phy_cfgs[CFG_TAG_MAX] = {
	[CFG_PRE_INIT]		= tensor_gs101_pre_init_cfg,
	[CFG_PRE_PWR_HS]	= tensor_gs101_pre_pwr_hs_config,
	[CFG_POST_PWR_HS]	= tensor_gs101_post_pwr_hs_config,
};

static const char * const tensor_gs101_ufs_phy_clks[] = {
	"ref_clk",
};

static int gs101_phy_wait_for_calibration(struct phy *phy, u8 lane)
{
	struct samsung_ufs_phy *ufs_phy = get_samsung_ufs_phy(phy);
	const unsigned int timeout_us = 40000;
	const unsigned int sleep_us = 40;
	u32 val;
	u32 off;
	int err;

	off = PHY_PMA_TRSV_ADDR(TRSV_REG338, lane);

	err = readl_poll_timeout(ufs_phy->reg_pma + off,
				 val, (val & LN0_MON_RX_CAL_DONE),
				 sleep_us, timeout_us);

	if (err) {
		dev_err(ufs_phy->dev,
			"failed to get phy cal done %d\n", err);
	}

	return err;
}

#define DELAY_IN_US	40
#define RETRY_CNT	100
static int gs101_phy_wait_for_cdr_lock(struct phy *phy, u8 lane)
{
	struct samsung_ufs_phy *ufs_phy = get_samsung_ufs_phy(phy);
	u32 val;
	int i;

	for (i = 0; i < RETRY_CNT; i++) {
		udelay(DELAY_IN_US);
		val = readl(ufs_phy->reg_pma +
			    PHY_PMA_TRSV_ADDR(TRSV_REG339, lane));

		if (val & LN0_MON_RX_CDR_FLD_CK_MODE_DONE)
			return 0;

		udelay(DELAY_IN_US);
		/* Override and enable clock data recovery */
		writel(LN0_OVRD_RX_CDR_EN, ufs_phy->reg_pma +
		       PHY_PMA_TRSV_ADDR(TRSV_REG222, lane));
		writel(LN0_OVRD_RX_CDR_EN | LN0_RX_CDR_EN,
		       ufs_phy->reg_pma + PHY_PMA_TRSV_ADDR(TRSV_REG222, lane));
	}
	dev_err(ufs_phy->dev, "failed to get cdr lock\n");
	return -ETIMEDOUT;
}

const struct samsung_ufs_phy_drvdata tensor_gs101_ufs_phy = {
	.cfgs = tensor_gs101_ufs_phy_cfgs,
	.isol = {
		.offset = TENSOR_GS101_PHY_CTRL,
		.mask = TENSOR_GS101_PHY_CTRL_MASK,
		.en = TENSOR_GS101_PHY_CTRL_EN,
	},
	.clk_list = tensor_gs101_ufs_phy_clks,
	.num_clks = ARRAY_SIZE(tensor_gs101_ufs_phy_clks),
	.wait_for_cal = gs101_phy_wait_for_calibration,
	.wait_for_cdr = gs101_phy_wait_for_cdr_lock,
};