drivers/mmc/host/sdhci-pci-gli.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2019 Genesys Logic, Inc.
  *
  * Authors: Ben Chuang <ben.chuang@genesyslogic.com.tw>
  *
  * Version: v0.9.0 (2019-08-08)
  */

 #include <linux/bitfield.h>
 #include <linux/bits.h>
 #include <linux/pci.h>
 #include <linux/mmc/mmc.h>
 #include <linux/delay.h>
 #include "sdhci.h"
 #include "sdhci-pci.h"

 /*  Genesys Logic extra registers */
 #define SDHCI_GLI_9750_WT         0x800
 #define   SDHCI_GLI_9750_WT_EN      BIT(0)
 #define   GLI_9750_WT_EN_ON	    0x1
 #define   GLI_9750_WT_EN_OFF	    0x0

 #define SDHCI_GLI_9750_DRIVING      0x860
 #define   SDHCI_GLI_9750_DRIVING_1    GENMASK(11, 0)
 #define   SDHCI_GLI_9750_DRIVING_2    GENMASK(27, 26)
 #define   GLI_9750_DRIVING_1_VALUE    0xFFF
 #define   GLI_9750_DRIVING_2_VALUE    0x3

 #define SDHCI_GLI_9750_PLL	      0x864
 #define   SDHCI_GLI_9750_PLL_TX2_INV    BIT(23)
 #define   SDHCI_GLI_9750_PLL_TX2_DLY    GENMASK(22, 20)
 #define   GLI_9750_PLL_TX2_INV_VALUE    0x1
 #define   GLI_9750_PLL_TX2_DLY_VALUE    0x0

 #define SDHCI_GLI_9750_SW_CTRL      0x874
 #define   SDHCI_GLI_9750_SW_CTRL_4    GENMASK(7, 6)
 #define   GLI_9750_SW_CTRL_4_VALUE    0x3

 #define SDHCI_GLI_9750_MISC            0x878
 #define   SDHCI_GLI_9750_MISC_TX1_INV    BIT(2)
 #define   SDHCI_GLI_9750_MISC_RX_INV     BIT(3)
 #define   SDHCI_GLI_9750_MISC_TX1_DLY    GENMASK(6, 4)
 #define   GLI_9750_MISC_TX1_INV_VALUE    0x0
 #define   GLI_9750_MISC_RX_INV_ON        0x1
 #define   GLI_9750_MISC_RX_INV_OFF       0x0
 #define   GLI_9750_MISC_RX_INV_VALUE     GLI_9750_MISC_RX_INV_OFF
 #define   GLI_9750_MISC_TX1_DLY_VALUE    0x5

 #define SDHCI_GLI_9750_TUNING_CONTROL	          0x540
 #define   SDHCI_GLI_9750_TUNING_CONTROL_EN          BIT(4)
 #define   GLI_9750_TUNING_CONTROL_EN_ON             0x1
 #define   GLI_9750_TUNING_CONTROL_EN_OFF            0x0
 #define   SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1    BIT(16)
 #define   SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2    GENMASK(20, 19)
 #define   GLI_9750_TUNING_CONTROL_GLITCH_1_VALUE    0x1
 #define   GLI_9750_TUNING_CONTROL_GLITCH_2_VALUE    0x2

 #define SDHCI_GLI_9750_TUNING_PARAMETERS           0x544
 #define   SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY    GENMASK(2, 0)
 #define   GLI_9750_TUNING_PARAMETERS_RX_DLY_VALUE    0x1

 #define GLI_MAX_TUNING_LOOP 40

 /* Genesys Logic chipset */
 static inline void gl9750_wt_on(struct sdhci_host *host)
 {
 	u32 wt_value;
 	u32 wt_enable;

 	wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
 	wt_enable = FIELD_GET(SDHCI_GLI_9750_WT_EN, wt_value);

 	if (wt_enable == GLI_9750_WT_EN_ON)
 		return;

 	wt_value &= ~SDHCI_GLI_9750_WT_EN;
 	wt_value |= FIELD_PREP(SDHCI_GLI_9750_WT_EN, GLI_9750_WT_EN_ON);

 	sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
 }

 static inline void gl9750_wt_off(struct sdhci_host *host)
 {
 	u32 wt_value;
 	u32 wt_enable;

 	wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
 	wt_enable = FIELD_GET(SDHCI_GLI_9750_WT_EN, wt_value);

 	if (wt_enable == GLI_9750_WT_EN_OFF)
 		return;

 	wt_value &= ~SDHCI_GLI_9750_WT_EN;
 	wt_value |= FIELD_PREP(SDHCI_GLI_9750_WT_EN, GLI_9750_WT_EN_OFF);

 	sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
 }

 static void gli_set_9750(struct sdhci_host *host)
 {
 	u32 driving_value;
 	u32 pll_value;
 	u32 sw_ctrl_value;
 	u32 misc_value;
 	u32 parameter_value;
 	u32 control_value;
 	u16 ctrl2;

 	gl9750_wt_on(host);

 	driving_value = sdhci_readl(host, SDHCI_GLI_9750_DRIVING);
 	pll_value = sdhci_readl(host, SDHCI_GLI_9750_PLL);
 	sw_ctrl_value = sdhci_readl(host, SDHCI_GLI_9750_SW_CTRL);
 	misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
 	parameter_value = sdhci_readl(host, SDHCI_GLI_9750_TUNING_PARAMETERS);
 	control_value = sdhci_readl(host, SDHCI_GLI_9750_TUNING_CONTROL);

 	driving_value &= ~(SDHCI_GLI_9750_DRIVING_1);
 	driving_value &= ~(SDHCI_GLI_9750_DRIVING_2);
 	driving_value |= FIELD_PREP(SDHCI_GLI_9750_DRIVING_1,
 				    GLI_9750_DRIVING_1_VALUE);
 	driving_value |= FIELD_PREP(SDHCI_GLI_9750_DRIVING_2,
 				    GLI_9750_DRIVING_2_VALUE);
 	sdhci_writel(host, driving_value, SDHCI_GLI_9750_DRIVING);

 	sw_ctrl_value &= ~SDHCI_GLI_9750_SW_CTRL_4;
 	sw_ctrl_value |= FIELD_PREP(SDHCI_GLI_9750_SW_CTRL_4,
 				    GLI_9750_SW_CTRL_4_VALUE);
 	sdhci_writel(host, sw_ctrl_value, SDHCI_GLI_9750_SW_CTRL);

 	/* reset the tuning flow after reinit and before starting tuning */
 	pll_value &= ~SDHCI_GLI_9750_PLL_TX2_INV;
 	pll_value &= ~SDHCI_GLI_9750_PLL_TX2_DLY;
 	pll_value |= FIELD_PREP(SDHCI_GLI_9750_PLL_TX2_INV,
 				GLI_9750_PLL_TX2_INV_VALUE);
 	pll_value |= FIELD_PREP(SDHCI_GLI_9750_PLL_TX2_DLY,
 				GLI_9750_PLL_TX2_DLY_VALUE);

 	misc_value &= ~SDHCI_GLI_9750_MISC_TX1_INV;
 	misc_value &= ~SDHCI_GLI_9750_MISC_RX_INV;
 	misc_value &= ~SDHCI_GLI_9750_MISC_TX1_DLY;
 	misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_TX1_INV,
 				 GLI_9750_MISC_TX1_INV_VALUE);
 	misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
 				 GLI_9750_MISC_RX_INV_VALUE);
 	misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_TX1_DLY,
 				 GLI_9750_MISC_TX1_DLY_VALUE);

 	parameter_value &= ~SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY;
 	parameter_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY,
 				      GLI_9750_TUNING_PARAMETERS_RX_DLY_VALUE);

 	control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1;
 	control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2;
 	control_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1,
 				    GLI_9750_TUNING_CONTROL_GLITCH_1_VALUE);
 	control_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2,
 				    GLI_9750_TUNING_CONTROL_GLITCH_2_VALUE);

 	sdhci_writel(host, pll_value, SDHCI_GLI_9750_PLL);
 	sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);

 	/* disable tuned clk */
 	ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 	ctrl2 &= ~SDHCI_CTRL_TUNED_CLK;
 	sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);

 	/* enable tuning parameters control */
 	control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_EN;
 	control_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_EN,
 				    GLI_9750_TUNING_CONTROL_EN_ON);
 	sdhci_writel(host, control_value, SDHCI_GLI_9750_TUNING_CONTROL);

 	/* write tuning parameters */
 	sdhci_writel(host, parameter_value, SDHCI_GLI_9750_TUNING_PARAMETERS);

 	/* disable tuning parameters control */
 	control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_EN;
 	control_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_EN,
 				    GLI_9750_TUNING_CONTROL_EN_OFF);
 	sdhci_writel(host, control_value, SDHCI_GLI_9750_TUNING_CONTROL);

 	/* clear tuned clk */
 	ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 	ctrl2 &= ~SDHCI_CTRL_TUNED_CLK;
 	sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);

 	gl9750_wt_off(host);
 }

 static void gli_set_9750_rx_inv(struct sdhci_host *host, bool b)
 {
 	u32 misc_value;

 	gl9750_wt_on(host);

 	misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
 	misc_value &= ~SDHCI_GLI_9750_MISC_RX_INV;
 	if (b) {
 		misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
 					 GLI_9750_MISC_RX_INV_ON);
 	} else {
 		misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
 					 GLI_9750_MISC_RX_INV_OFF);
 	}
 	sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);

 	gl9750_wt_off(host);
 }

 static int __sdhci_execute_tuning_9750(struct sdhci_host *host, u32 opcode)
 {
 	int i;
 	int rx_inv;

 	for (rx_inv = 0; rx_inv < 2; rx_inv++) {
 		gli_set_9750_rx_inv(host, !!rx_inv);
 		sdhci_start_tuning(host);

 		for (i = 0; i < GLI_MAX_TUNING_LOOP; i++) {
 			u16 ctrl;

 			sdhci_send_tuning(host, opcode);

 			if (!host->tuning_done) {
 				sdhci_abort_tuning(host, opcode);
 				break;
 			}

 			ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 			if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
 				if (ctrl & SDHCI_CTRL_TUNED_CLK)
 					return 0; /* Success! */
 				break;
 			}
 		}
 	}
 	if (!host->tuning_done) {
 		pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
 			mmc_hostname(host->mmc));
 		return -ETIMEDOUT;
 	}

 	pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
 		mmc_hostname(host->mmc));
 	sdhci_reset_tuning(host);

 	return -EAGAIN;
 }

 static int gl9750_execute_tuning(struct sdhci_host *host, u32 opcode)
 {
 	host->mmc->retune_period = 0;
 	if (host->tuning_mode == SDHCI_TUNING_MODE_1)
 		host->mmc->retune_period = host->tuning_count;

 	gli_set_9750(host);
 	host->tuning_err = __sdhci_execute_tuning_9750(host, opcode);
 	sdhci_end_tuning(host);

 	return 0;
 }

 static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
 {
 	struct sdhci_host *host = slot->host;

 	slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
 	sdhci_enable_v4_mode(host);

 	return 0;
 }

 static int gli_probe_slot_gl9755(struct sdhci_pci_slot *slot)
 {
 	struct sdhci_host *host = slot->host;

 	slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
 	sdhci_enable_v4_mode(host);

 	return 0;
 }

 static void sdhci_gli_voltage_switch(struct sdhci_host *host)
 {
 	/*
 	 * According to Section 3.6.1 signal voltage switch procedure in
 	 * SD Host Controller Simplified Spec. 4.20, steps 6~8 are as
 	 * follows:
 	 * (6) Set 1.8V Signal Enable in the Host Control 2 register.
 	 * (7) Wait 5ms. 1.8V voltage regulator shall be stable within this
 	 *     period.
 	 * (8) If 1.8V Signal Enable is cleared by Host Controller, go to
 	 *     step (12).
 	 *
 	 * Wait 5ms after set 1.8V signal enable in Host Control 2 register
 	 * to ensure 1.8V signal enable bit is set by GL9750/GL9755.
 	 */
 	usleep_range(5000, 5500);
 }

 static void sdhci_gl9750_reset(struct sdhci_host *host, u8 mask)
 {
 	sdhci_reset(host, mask);
 	gli_set_9750(host);
 }

 static u32 sdhci_gl9750_readl(struct sdhci_host *host, int reg)
 {
 	u32 value;

 	value = readl(host->ioaddr + reg);
 	if (unlikely(reg == SDHCI_MAX_CURRENT && !(value & 0xff)))
 		value |= 0xc8;

 	return value;
 }

 static const struct sdhci_ops sdhci_gl9755_ops = {
 	.set_clock		= sdhci_set_clock,
 	.enable_dma		= sdhci_pci_enable_dma,
 	.set_bus_width		= sdhci_set_bus_width,
 	.reset			= sdhci_reset,
 	.set_uhs_signaling	= sdhci_set_uhs_signaling,
 	.voltage_switch		= sdhci_gli_voltage_switch,
 };

 const struct sdhci_pci_fixes sdhci_gl9755 = {
 	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 	.quirks2	= SDHCI_QUIRK2_BROKEN_DDR50,
 	.probe_slot	= gli_probe_slot_gl9755,
 	.ops            = &sdhci_gl9755_ops,
 };

 static const struct sdhci_ops sdhci_gl9750_ops = {
 	.read_l                 = sdhci_gl9750_readl,
 	.set_clock		= sdhci_set_clock,
 	.enable_dma		= sdhci_pci_enable_dma,
 	.set_bus_width		= sdhci_set_bus_width,
 	.reset			= sdhci_gl9750_reset,
 	.set_uhs_signaling	= sdhci_set_uhs_signaling,
 	.voltage_switch		= sdhci_gli_voltage_switch,
 	.platform_execute_tuning = gl9750_execute_tuning,
 };

 const struct sdhci_pci_fixes sdhci_gl9750 = {
 	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 	.quirks2	= SDHCI_QUIRK2_BROKEN_DDR50,
 	.probe_slot	= gli_probe_slot_gl9750,
 	.ops            = &sdhci_gl9750_ops,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2019 Genesys Logic, Inc.
	*
	* Authors: Ben Chuang <ben.chuang@genesyslogic.com.tw>
	*
	* Version: v0.9.0 (2019-08-08)
	*/

	#include <linux/bitfield.h>
	#include <linux/bits.h>
	#include <linux/pci.h>
	#include <linux/mmc/mmc.h>
	#include <linux/delay.h>
	#include "sdhci.h"
	#include "sdhci-pci.h"

	/* Genesys Logic extra registers */
	#define SDHCI_GLI_9750_WT 0x800
	#define SDHCI_GLI_9750_WT_EN BIT(0)
	#define GLI_9750_WT_EN_ON 0x1
	#define GLI_9750_WT_EN_OFF 0x0

	#define SDHCI_GLI_9750_DRIVING 0x860
	#define SDHCI_GLI_9750_DRIVING_1 GENMASK(11, 0)
	#define SDHCI_GLI_9750_DRIVING_2 GENMASK(27, 26)
	#define GLI_9750_DRIVING_1_VALUE 0xFFF
	#define GLI_9750_DRIVING_2_VALUE 0x3

	#define SDHCI_GLI_9750_PLL 0x864
	#define SDHCI_GLI_9750_PLL_TX2_INV BIT(23)
	#define SDHCI_GLI_9750_PLL_TX2_DLY GENMASK(22, 20)
	#define GLI_9750_PLL_TX2_INV_VALUE 0x1
	#define GLI_9750_PLL_TX2_DLY_VALUE 0x0

	#define SDHCI_GLI_9750_SW_CTRL 0x874
	#define SDHCI_GLI_9750_SW_CTRL_4 GENMASK(7, 6)
	#define GLI_9750_SW_CTRL_4_VALUE 0x3

	#define SDHCI_GLI_9750_MISC 0x878
	#define SDHCI_GLI_9750_MISC_TX1_INV BIT(2)
	#define SDHCI_GLI_9750_MISC_RX_INV BIT(3)
	#define SDHCI_GLI_9750_MISC_TX1_DLY GENMASK(6, 4)
	#define GLI_9750_MISC_TX1_INV_VALUE 0x0
	#define GLI_9750_MISC_RX_INV_ON 0x1
	#define GLI_9750_MISC_RX_INV_OFF 0x0
	#define GLI_9750_MISC_RX_INV_VALUE GLI_9750_MISC_RX_INV_OFF
	#define GLI_9750_MISC_TX1_DLY_VALUE 0x5

	#define SDHCI_GLI_9750_TUNING_CONTROL 0x540
	#define SDHCI_GLI_9750_TUNING_CONTROL_EN BIT(4)
	#define GLI_9750_TUNING_CONTROL_EN_ON 0x1
	#define GLI_9750_TUNING_CONTROL_EN_OFF 0x0
	#define SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1 BIT(16)
	#define SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2 GENMASK(20, 19)
	#define GLI_9750_TUNING_CONTROL_GLITCH_1_VALUE 0x1
	#define GLI_9750_TUNING_CONTROL_GLITCH_2_VALUE 0x2

	#define SDHCI_GLI_9750_TUNING_PARAMETERS 0x544
	#define SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY GENMASK(2, 0)
	#define GLI_9750_TUNING_PARAMETERS_RX_DLY_VALUE 0x1

	#define GLI_MAX_TUNING_LOOP 40

	/* Genesys Logic chipset */
	static inline void gl9750_wt_on(struct sdhci_host *host)
	{
	u32 wt_value;
	u32 wt_enable;

	wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
	wt_enable = FIELD_GET(SDHCI_GLI_9750_WT_EN, wt_value);

	if (wt_enable == GLI_9750_WT_EN_ON)
	return;

	wt_value &= ~SDHCI_GLI_9750_WT_EN;
	wt_value \|= FIELD_PREP(SDHCI_GLI_9750_WT_EN, GLI_9750_WT_EN_ON);

	sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
	}

	static inline void gl9750_wt_off(struct sdhci_host *host)
	{
	u32 wt_value;
	u32 wt_enable;

	wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
	wt_enable = FIELD_GET(SDHCI_GLI_9750_WT_EN, wt_value);

	if (wt_enable == GLI_9750_WT_EN_OFF)
	return;

	wt_value &= ~SDHCI_GLI_9750_WT_EN;
	wt_value \|= FIELD_PREP(SDHCI_GLI_9750_WT_EN, GLI_9750_WT_EN_OFF);

	sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
	}

	static void gli_set_9750(struct sdhci_host *host)
	{
	u32 driving_value;
	u32 pll_value;
	u32 sw_ctrl_value;
	u32 misc_value;
	u32 parameter_value;
	u32 control_value;
	u16 ctrl2;

	gl9750_wt_on(host);

	driving_value = sdhci_readl(host, SDHCI_GLI_9750_DRIVING);
	pll_value = sdhci_readl(host, SDHCI_GLI_9750_PLL);
	sw_ctrl_value = sdhci_readl(host, SDHCI_GLI_9750_SW_CTRL);
	misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
	parameter_value = sdhci_readl(host, SDHCI_GLI_9750_TUNING_PARAMETERS);
	control_value = sdhci_readl(host, SDHCI_GLI_9750_TUNING_CONTROL);

	driving_value &= ~(SDHCI_GLI_9750_DRIVING_1);
	driving_value &= ~(SDHCI_GLI_9750_DRIVING_2);
	driving_value \|= FIELD_PREP(SDHCI_GLI_9750_DRIVING_1,
	GLI_9750_DRIVING_1_VALUE);
	driving_value \|= FIELD_PREP(SDHCI_GLI_9750_DRIVING_2,
	GLI_9750_DRIVING_2_VALUE);
	sdhci_writel(host, driving_value, SDHCI_GLI_9750_DRIVING);

	sw_ctrl_value &= ~SDHCI_GLI_9750_SW_CTRL_4;
	sw_ctrl_value \|= FIELD_PREP(SDHCI_GLI_9750_SW_CTRL_4,
	GLI_9750_SW_CTRL_4_VALUE);
	sdhci_writel(host, sw_ctrl_value, SDHCI_GLI_9750_SW_CTRL);

	/* reset the tuning flow after reinit and before starting tuning */
	pll_value &= ~SDHCI_GLI_9750_PLL_TX2_INV;
	pll_value &= ~SDHCI_GLI_9750_PLL_TX2_DLY;
	pll_value \|= FIELD_PREP(SDHCI_GLI_9750_PLL_TX2_INV,
	GLI_9750_PLL_TX2_INV_VALUE);
	pll_value \|= FIELD_PREP(SDHCI_GLI_9750_PLL_TX2_DLY,
	GLI_9750_PLL_TX2_DLY_VALUE);

	misc_value &= ~SDHCI_GLI_9750_MISC_TX1_INV;
	misc_value &= ~SDHCI_GLI_9750_MISC_RX_INV;
	misc_value &= ~SDHCI_GLI_9750_MISC_TX1_DLY;
	misc_value \|= FIELD_PREP(SDHCI_GLI_9750_MISC_TX1_INV,
	GLI_9750_MISC_TX1_INV_VALUE);
	misc_value \|= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
	GLI_9750_MISC_RX_INV_VALUE);
	misc_value \|= FIELD_PREP(SDHCI_GLI_9750_MISC_TX1_DLY,
	GLI_9750_MISC_TX1_DLY_VALUE);

	parameter_value &= ~SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY;
	parameter_value \|= FIELD_PREP(SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY,
	GLI_9750_TUNING_PARAMETERS_RX_DLY_VALUE);

	control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1;
	control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2;
	control_value \|= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1,
	GLI_9750_TUNING_CONTROL_GLITCH_1_VALUE);
	control_value \|= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2,
	GLI_9750_TUNING_CONTROL_GLITCH_2_VALUE);

	sdhci_writel(host, pll_value, SDHCI_GLI_9750_PLL);
	sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);

	/* disable tuned clk */
	ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
	ctrl2 &= ~SDHCI_CTRL_TUNED_CLK;
	sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);

	/* enable tuning parameters control */
	control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_EN;
	control_value \|= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_EN,
	GLI_9750_TUNING_CONTROL_EN_ON);
	sdhci_writel(host, control_value, SDHCI_GLI_9750_TUNING_CONTROL);

	/* write tuning parameters */
	sdhci_writel(host, parameter_value, SDHCI_GLI_9750_TUNING_PARAMETERS);

	/* disable tuning parameters control */
	control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_EN;
	control_value \|= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_EN,
	GLI_9750_TUNING_CONTROL_EN_OFF);
	sdhci_writel(host, control_value, SDHCI_GLI_9750_TUNING_CONTROL);

	/* clear tuned clk */
	ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
	ctrl2 &= ~SDHCI_CTRL_TUNED_CLK;
	sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);

	gl9750_wt_off(host);
	}

	static void gli_set_9750_rx_inv(struct sdhci_host *host, bool b)
	{
	u32 misc_value;

	gl9750_wt_on(host);

	misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
	misc_value &= ~SDHCI_GLI_9750_MISC_RX_INV;
	if (b) {
	misc_value \|= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
	GLI_9750_MISC_RX_INV_ON);
	} else {
	misc_value \|= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
	GLI_9750_MISC_RX_INV_OFF);
	}
	sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);

	gl9750_wt_off(host);
	}

	static int __sdhci_execute_tuning_9750(struct sdhci_host *host, u32 opcode)
	{
	int i;
	int rx_inv;

	for (rx_inv = 0; rx_inv < 2; rx_inv++) {
	gli_set_9750_rx_inv(host, !!rx_inv);
	sdhci_start_tuning(host);

	for (i = 0; i < GLI_MAX_TUNING_LOOP; i++) {
	u16 ctrl;

	sdhci_send_tuning(host, opcode);

	if (!host->tuning_done) {
	sdhci_abort_tuning(host, opcode);
	break;
	}

	ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
	if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
	if (ctrl & SDHCI_CTRL_TUNED_CLK)
	return 0; /* Success! */
	break;
	}
	}
	}
	if (!host->tuning_done) {
	pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
	mmc_hostname(host->mmc));
	return -ETIMEDOUT;
	}

	pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
	mmc_hostname(host->mmc));
	sdhci_reset_tuning(host);

	return -EAGAIN;
	}

	static int gl9750_execute_tuning(struct sdhci_host *host, u32 opcode)
	{
	host->mmc->retune_period = 0;
	if (host->tuning_mode == SDHCI_TUNING_MODE_1)
	host->mmc->retune_period = host->tuning_count;

	gli_set_9750(host);
	host->tuning_err = __sdhci_execute_tuning_9750(host, opcode);
	sdhci_end_tuning(host);

	return 0;
	}

	static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
	{
	struct sdhci_host *host = slot->host;

	slot->host->mmc->caps2 \|= MMC_CAP2_NO_SDIO;
	sdhci_enable_v4_mode(host);

	return 0;
	}

	static int gli_probe_slot_gl9755(struct sdhci_pci_slot *slot)
	{
	struct sdhci_host *host = slot->host;

	slot->host->mmc->caps2 \|= MMC_CAP2_NO_SDIO;
	sdhci_enable_v4_mode(host);

	return 0;
	}

	static void sdhci_gli_voltage_switch(struct sdhci_host *host)
	{
	/*
	* According to Section 3.6.1 signal voltage switch procedure in
	* SD Host Controller Simplified Spec. 4.20, steps 6~8 are as
	* follows:
	* (6) Set 1.8V Signal Enable in the Host Control 2 register.
	* (7) Wait 5ms. 1.8V voltage regulator shall be stable within this
	* period.
	* (8) If 1.8V Signal Enable is cleared by Host Controller, go to
	* step (12).
	*
	* Wait 5ms after set 1.8V signal enable in Host Control 2 register
	* to ensure 1.8V signal enable bit is set by GL9750/GL9755.
	*/
	usleep_range(5000, 5500);
	}

	static void sdhci_gl9750_reset(struct sdhci_host *host, u8 mask)
	{
	sdhci_reset(host, mask);
	gli_set_9750(host);
	}

	static u32 sdhci_gl9750_readl(struct sdhci_host *host, int reg)
	{
	u32 value;

	value = readl(host->ioaddr + reg);
	if (unlikely(reg == SDHCI_MAX_CURRENT && !(value & 0xff)))
	value \|= 0xc8;

	return value;
	}

	static const struct sdhci_ops sdhci_gl9755_ops = {
	.set_clock = sdhci_set_clock,
	.enable_dma = sdhci_pci_enable_dma,
	.set_bus_width = sdhci_set_bus_width,
	.reset = sdhci_reset,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
	.voltage_switch = sdhci_gli_voltage_switch,
	};

	const struct sdhci_pci_fixes sdhci_gl9755 = {
	.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
	.quirks2 = SDHCI_QUIRK2_BROKEN_DDR50,
	.probe_slot = gli_probe_slot_gl9755,
	.ops = &sdhci_gl9755_ops,
	};

	static const struct sdhci_ops sdhci_gl9750_ops = {
	.read_l = sdhci_gl9750_readl,
	.set_clock = sdhci_set_clock,
	.enable_dma = sdhci_pci_enable_dma,
	.set_bus_width = sdhci_set_bus_width,
	.reset = sdhci_gl9750_reset,
	.set_uhs_signaling = sdhci_set_uhs_signaling,
	.voltage_switch = sdhci_gli_voltage_switch,
	.platform_execute_tuning = gl9750_execute_tuning,
	};

	const struct sdhci_pci_fixes sdhci_gl9750 = {
	.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
	.quirks2 = SDHCI_QUIRK2_BROKEN_DDR50,
	.probe_slot = gli_probe_slot_gl9750,
	.ops = &sdhci_gl9750_ops,
	};