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sdhci-tegra.c
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sdhci-tegra.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2010 Google, Inc.
*/
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/ktime.h>
#include "sdhci-pltfm.h"
#include "cqhci.h"
/* Tegra SDHOST controller vendor register definitions */
#define SDHCI_TEGRA_VENDOR_CLOCK_CTRL 0x100
#define SDHCI_CLOCK_CTRL_TAP_MASK 0x00ff0000
#define SDHCI_CLOCK_CTRL_TAP_SHIFT 16
#define SDHCI_CLOCK_CTRL_TRIM_MASK 0x1f000000
#define SDHCI_CLOCK_CTRL_TRIM_SHIFT 24
#define SDHCI_CLOCK_CTRL_SDR50_TUNING_OVERRIDE BIT(5)
#define SDHCI_CLOCK_CTRL_PADPIPE_CLKEN_OVERRIDE BIT(3)
#define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE BIT(2)
#define SDHCI_TEGRA_VENDOR_SYS_SW_CTRL 0x104
#define SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE BIT(31)
#define SDHCI_TEGRA_VENDOR_CAP_OVERRIDES 0x10c
#define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_MASK 0x00003f00
#define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT 8
#define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120
#define SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT BIT(0)
#define SDHCI_MISC_CTRL_ENABLE_SDR104 0x8
#define SDHCI_MISC_CTRL_ENABLE_SDR50 0x10
#define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20
#define SDHCI_MISC_CTRL_ENABLE_DDR50 0x200
#define SDHCI_TEGRA_VENDOR_DLLCAL_CFG 0x1b0
#define SDHCI_TEGRA_DLLCAL_CALIBRATE BIT(31)
#define SDHCI_TEGRA_VENDOR_DLLCAL_STA 0x1bc
#define SDHCI_TEGRA_DLLCAL_STA_ACTIVE BIT(31)
#define SDHCI_VNDR_TUN_CTRL0_0 0x1c0
#define SDHCI_VNDR_TUN_CTRL0_TUN_HW_TAP 0x20000
#define SDHCI_VNDR_TUN_CTRL0_START_TAP_VAL_MASK 0x03fc0000
#define SDHCI_VNDR_TUN_CTRL0_START_TAP_VAL_SHIFT 18
#define SDHCI_VNDR_TUN_CTRL0_MUL_M_MASK 0x00001fc0
#define SDHCI_VNDR_TUN_CTRL0_MUL_M_SHIFT 6
#define SDHCI_VNDR_TUN_CTRL0_TUN_ITER_MASK 0x000e000
#define SDHCI_VNDR_TUN_CTRL0_TUN_ITER_SHIFT 13
#define TRIES_128 2
#define TRIES_256 4
#define SDHCI_VNDR_TUN_CTRL0_TUN_WORD_SEL_MASK 0x7
#define SDHCI_TEGRA_VNDR_TUN_CTRL1_0 0x1c4
#define SDHCI_TEGRA_VNDR_TUN_STATUS0 0x1C8
#define SDHCI_TEGRA_VNDR_TUN_STATUS1 0x1CC
#define SDHCI_TEGRA_VNDR_TUN_STATUS1_TAP_MASK 0xFF
#define SDHCI_TEGRA_VNDR_TUN_STATUS1_END_TAP_SHIFT 0x8
#define TUNING_WORD_BIT_SIZE 32
#define SDHCI_TEGRA_AUTO_CAL_CONFIG 0x1e4
#define SDHCI_AUTO_CAL_START BIT(31)
#define SDHCI_AUTO_CAL_ENABLE BIT(29)
#define SDHCI_AUTO_CAL_PDPU_OFFSET_MASK 0x0000ffff
#define SDHCI_TEGRA_SDMEM_COMP_PADCTRL 0x1e0
#define SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_MASK 0x0000000f
#define SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_VAL 0x7
#define SDHCI_TEGRA_SDMEM_COMP_PADCTRL_E_INPUT_E_PWRD BIT(31)
#define SDHCI_COMP_PADCTRL_DRVUPDN_OFFSET_MASK 0x07FFF000
#define SDHCI_TEGRA_AUTO_CAL_STATUS 0x1ec
#define SDHCI_TEGRA_AUTO_CAL_ACTIVE BIT(31)
#define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0)
#define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1)
#define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2)
#define NVQUIRK_ENABLE_SDR50 BIT(3)
#define NVQUIRK_ENABLE_SDR104 BIT(4)
#define NVQUIRK_ENABLE_DDR50 BIT(5)
/*
* HAS_PADCALIB NVQUIRK is for SoC's supporting auto calibration of pads
* drive strength.
*/
#define NVQUIRK_HAS_PADCALIB BIT(6)
/*
* NEEDS_PAD_CONTROL NVQUIRK is for SoC's having separate 3V3 and 1V8 pads.
* 3V3/1V8 pad selection happens through pinctrl state selection depending
* on the signaling mode.
*/
#define NVQUIRK_NEEDS_PAD_CONTROL BIT(7)
#define NVQUIRK_DIS_CARD_CLK_CONFIG_TAP BIT(8)
#define NVQUIRK_CQHCI_DCMD_R1B_CMD_TIMING BIT(9)
/*
* NVQUIRK_HAS_TMCLK is for SoC's having separate timeout clock for Tegra
* SDMMC hardware data timeout.
*/
#define NVQUIRK_HAS_TMCLK BIT(10)
/* SDMMC CQE Base Address for Tegra Host Ver 4.1 and Higher */
#define SDHCI_TEGRA_CQE_BASE_ADDR 0xF000
#define SDHCI_TEGRA_CQE_TRNS_MODE (SDHCI_TRNS_MULTI | \
SDHCI_TRNS_BLK_CNT_EN | \
SDHCI_TRNS_DMA)
struct sdhci_tegra_soc_data {
const struct sdhci_pltfm_data *pdata;
u64 dma_mask;
u32 nvquirks;
u8 min_tap_delay;
u8 max_tap_delay;
};
/* Magic pull up and pull down pad calibration offsets */
struct sdhci_tegra_autocal_offsets {
u32 pull_up_3v3;
u32 pull_down_3v3;
u32 pull_up_3v3_timeout;
u32 pull_down_3v3_timeout;
u32 pull_up_1v8;
u32 pull_down_1v8;
u32 pull_up_1v8_timeout;
u32 pull_down_1v8_timeout;
u32 pull_up_sdr104;
u32 pull_down_sdr104;
u32 pull_up_hs400;
u32 pull_down_hs400;
};
struct sdhci_tegra {
const struct sdhci_tegra_soc_data *soc_data;
struct gpio_desc *power_gpio;
struct clk *tmclk;
bool ddr_signaling;
bool pad_calib_required;
bool pad_control_available;
struct reset_control *rst;
struct pinctrl *pinctrl_sdmmc;
struct pinctrl_state *pinctrl_state_3v3;
struct pinctrl_state *pinctrl_state_1v8;
struct pinctrl_state *pinctrl_state_3v3_drv;
struct pinctrl_state *pinctrl_state_1v8_drv;
struct sdhci_tegra_autocal_offsets autocal_offsets;
ktime_t last_calib;
u32 default_tap;
u32 default_trim;
u32 dqs_trim;
bool enable_hwcq;
unsigned long curr_clk_rate;
u8 tuned_tap_delay;
};
static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) &&
(reg == SDHCI_HOST_VERSION))) {
/* Erratum: Version register is invalid in HW. */
return SDHCI_SPEC_200;
}
return readw(host->ioaddr + reg);
}
static void tegra_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
switch (reg) {
case SDHCI_TRANSFER_MODE:
/*
* Postpone this write, we must do it together with a
* command write that is down below.
*/
pltfm_host->xfer_mode_shadow = val;
return;
case SDHCI_COMMAND:
writel((val << 16) | pltfm_host->xfer_mode_shadow,
host->ioaddr + SDHCI_TRANSFER_MODE);
return;
}
writew(val, host->ioaddr + reg);
}
static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
/* Seems like we're getting spurious timeout and crc errors, so
* disable signalling of them. In case of real errors software
* timers should take care of eventually detecting them.
*/
if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
writel(val, host->ioaddr + reg);
if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) &&
(reg == SDHCI_INT_ENABLE))) {
/* Erratum: Must enable block gap interrupt detection */
u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
if (val & SDHCI_INT_CARD_INT)
gap_ctrl |= 0x8;
else
gap_ctrl &= ~0x8;
writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
}
}
static bool tegra_sdhci_configure_card_clk(struct sdhci_host *host, bool enable)
{
bool status;
u32 reg;
reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
status = !!(reg & SDHCI_CLOCK_CARD_EN);
if (status == enable)
return status;
if (enable)
reg |= SDHCI_CLOCK_CARD_EN;
else
reg &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL);
return status;
}
static void tegra210_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
{
bool is_tuning_cmd = 0;
bool clk_enabled;
u8 cmd;
if (reg == SDHCI_COMMAND) {
cmd = SDHCI_GET_CMD(val);
is_tuning_cmd = cmd == MMC_SEND_TUNING_BLOCK ||
cmd == MMC_SEND_TUNING_BLOCK_HS200;
}
if (is_tuning_cmd)
clk_enabled = tegra_sdhci_configure_card_clk(host, 0);
writew(val, host->ioaddr + reg);
if (is_tuning_cmd) {
udelay(1);
sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
tegra_sdhci_configure_card_clk(host, clk_enabled);
}
}
static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
{
/*
* Write-enable shall be assumed if GPIO is missing in a board's
* device-tree because SDHCI's WRITE_PROTECT bit doesn't work on
* Tegra.
*/
return mmc_gpio_get_ro(host->mmc);
}
static bool tegra_sdhci_is_pad_and_regulator_valid(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
int has_1v8, has_3v3;
/*
* The SoCs which have NVQUIRK_NEEDS_PAD_CONTROL require software pad
* voltage configuration in order to perform voltage switching. This
* means that valid pinctrl info is required on SDHCI instances capable
* of performing voltage switching. Whether or not an SDHCI instance is
* capable of voltage switching is determined based on the regulator.
*/
if (!(tegra_host->soc_data->nvquirks & NVQUIRK_NEEDS_PAD_CONTROL))
return true;
if (IS_ERR(host->mmc->supply.vqmmc))
return false;
has_1v8 = regulator_is_supported_voltage(host->mmc->supply.vqmmc,
1700000, 1950000);
has_3v3 = regulator_is_supported_voltage(host->mmc->supply.vqmmc,
2700000, 3600000);
if (has_1v8 == 1 && has_3v3 == 1)
return tegra_host->pad_control_available;
/* Fixed voltage, no pad control required. */
return true;
}
static void tegra_sdhci_set_tap(struct sdhci_host *host, unsigned int tap)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
bool card_clk_enabled = false;
u32 reg;
/*
* Touching the tap values is a bit tricky on some SoC generations.
* The quirk enables a workaround for a glitch that sometimes occurs if
* the tap values are changed.
*/
if (soc_data->nvquirks & NVQUIRK_DIS_CARD_CLK_CONFIG_TAP)
card_clk_enabled = tegra_sdhci_configure_card_clk(host, false);
reg = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
reg &= ~SDHCI_CLOCK_CTRL_TAP_MASK;
reg |= tap << SDHCI_CLOCK_CTRL_TAP_SHIFT;
sdhci_writel(host, reg, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
if (soc_data->nvquirks & NVQUIRK_DIS_CARD_CLK_CONFIG_TAP &&
card_clk_enabled) {
udelay(1);
sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
tegra_sdhci_configure_card_clk(host, card_clk_enabled);
}
}
static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
u32 misc_ctrl, clk_ctrl, pad_ctrl;
sdhci_reset(host, mask);
if (!(mask & SDHCI_RESET_ALL))
return;
tegra_sdhci_set_tap(host, tegra_host->default_tap);
misc_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
clk_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
misc_ctrl &= ~(SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 |
SDHCI_MISC_CTRL_ENABLE_SDR50 |
SDHCI_MISC_CTRL_ENABLE_DDR50 |
SDHCI_MISC_CTRL_ENABLE_SDR104);
clk_ctrl &= ~(SDHCI_CLOCK_CTRL_TRIM_MASK |
SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE);
if (tegra_sdhci_is_pad_and_regulator_valid(host)) {
/* Erratum: Enable SDHCI spec v3.00 support */
if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300)
misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300;
/* Advertise UHS modes as supported by host */
if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR50)
misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDR50;
if (soc_data->nvquirks & NVQUIRK_ENABLE_DDR50)
misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_DDR50;
if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR104)
misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDR104;
if (soc_data->nvquirks & NVQUIRK_ENABLE_SDR50)
clk_ctrl |= SDHCI_CLOCK_CTRL_SDR50_TUNING_OVERRIDE;
}
clk_ctrl |= tegra_host->default_trim << SDHCI_CLOCK_CTRL_TRIM_SHIFT;
sdhci_writel(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
sdhci_writel(host, clk_ctrl, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
if (soc_data->nvquirks & NVQUIRK_HAS_PADCALIB) {
pad_ctrl = sdhci_readl(host, SDHCI_TEGRA_SDMEM_COMP_PADCTRL);
pad_ctrl &= ~SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_MASK;
pad_ctrl |= SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_VAL;
sdhci_writel(host, pad_ctrl, SDHCI_TEGRA_SDMEM_COMP_PADCTRL);
tegra_host->pad_calib_required = true;
}
tegra_host->ddr_signaling = false;
}
static void tegra_sdhci_configure_cal_pad(struct sdhci_host *host, bool enable)
{
u32 val;
/*
* Enable or disable the additional I/O pad used by the drive strength
* calibration process.
*/
val = sdhci_readl(host, SDHCI_TEGRA_SDMEM_COMP_PADCTRL);
if (enable)
val |= SDHCI_TEGRA_SDMEM_COMP_PADCTRL_E_INPUT_E_PWRD;
else
val &= ~SDHCI_TEGRA_SDMEM_COMP_PADCTRL_E_INPUT_E_PWRD;
sdhci_writel(host, val, SDHCI_TEGRA_SDMEM_COMP_PADCTRL);
if (enable)
usleep_range(1, 2);
}
static void tegra_sdhci_set_pad_autocal_offset(struct sdhci_host *host,
u16 pdpu)
{
u32 reg;
reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG);
reg &= ~SDHCI_AUTO_CAL_PDPU_OFFSET_MASK;
reg |= pdpu;
sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG);
}
static int tegra_sdhci_set_padctrl(struct sdhci_host *host, int voltage,
bool state_drvupdn)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
struct sdhci_tegra_autocal_offsets *offsets =
&tegra_host->autocal_offsets;
struct pinctrl_state *pinctrl_drvupdn = NULL;
int ret = 0;
u8 drvup = 0, drvdn = 0;
u32 reg;
if (!state_drvupdn) {
/* PADS Drive Strength */
if (voltage == MMC_SIGNAL_VOLTAGE_180) {
if (tegra_host->pinctrl_state_1v8_drv) {
pinctrl_drvupdn =
tegra_host->pinctrl_state_1v8_drv;
} else {
drvup = offsets->pull_up_1v8_timeout;
drvdn = offsets->pull_down_1v8_timeout;
}
} else {
if (tegra_host->pinctrl_state_3v3_drv) {
pinctrl_drvupdn =
tegra_host->pinctrl_state_3v3_drv;
} else {
drvup = offsets->pull_up_3v3_timeout;
drvdn = offsets->pull_down_3v3_timeout;
}
}
if (pinctrl_drvupdn != NULL) {
ret = pinctrl_select_state(tegra_host->pinctrl_sdmmc,
pinctrl_drvupdn);
if (ret < 0)
dev_err(mmc_dev(host->mmc),
"failed pads drvupdn, ret: %d\n", ret);
} else if ((drvup) || (drvdn)) {
reg = sdhci_readl(host,
SDHCI_TEGRA_SDMEM_COMP_PADCTRL);
reg &= ~SDHCI_COMP_PADCTRL_DRVUPDN_OFFSET_MASK;
reg |= (drvup << 20) | (drvdn << 12);
sdhci_writel(host, reg,
SDHCI_TEGRA_SDMEM_COMP_PADCTRL);
}
} else {
/* Dual Voltage PADS Voltage selection */
if (!tegra_host->pad_control_available)
return 0;
if (voltage == MMC_SIGNAL_VOLTAGE_180) {
ret = pinctrl_select_state(tegra_host->pinctrl_sdmmc,
tegra_host->pinctrl_state_1v8);
if (ret < 0)
dev_err(mmc_dev(host->mmc),
"setting 1.8V failed, ret: %d\n", ret);
} else {
ret = pinctrl_select_state(tegra_host->pinctrl_sdmmc,
tegra_host->pinctrl_state_3v3);
if (ret < 0)
dev_err(mmc_dev(host->mmc),
"setting 3.3V failed, ret: %d\n", ret);
}
}
return ret;
}
static void tegra_sdhci_pad_autocalib(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
struct sdhci_tegra_autocal_offsets offsets =
tegra_host->autocal_offsets;
struct mmc_ios *ios = &host->mmc->ios;
bool card_clk_enabled;
u16 pdpu;
u32 reg;
int ret;
switch (ios->timing) {
case MMC_TIMING_UHS_SDR104:
pdpu = offsets.pull_down_sdr104 << 8 | offsets.pull_up_sdr104;
break;
case MMC_TIMING_MMC_HS400:
pdpu = offsets.pull_down_hs400 << 8 | offsets.pull_up_hs400;
break;
default:
if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
pdpu = offsets.pull_down_1v8 << 8 | offsets.pull_up_1v8;
else
pdpu = offsets.pull_down_3v3 << 8 | offsets.pull_up_3v3;
}
/* Set initial offset before auto-calibration */
tegra_sdhci_set_pad_autocal_offset(host, pdpu);
card_clk_enabled = tegra_sdhci_configure_card_clk(host, false);
tegra_sdhci_configure_cal_pad(host, true);
reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG);
reg |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START;
sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG);
usleep_range(1, 2);
/* 10 ms timeout */
ret = readl_poll_timeout(host->ioaddr + SDHCI_TEGRA_AUTO_CAL_STATUS,
reg, !(reg & SDHCI_TEGRA_AUTO_CAL_ACTIVE),
1000, 10000);
tegra_sdhci_configure_cal_pad(host, false);
tegra_sdhci_configure_card_clk(host, card_clk_enabled);
if (ret) {
dev_err(mmc_dev(host->mmc), "Pad autocal timed out\n");
/* Disable automatic cal and use fixed Drive Strengths */
reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG);
reg &= ~SDHCI_AUTO_CAL_ENABLE;
sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG);
ret = tegra_sdhci_set_padctrl(host, ios->signal_voltage, false);
if (ret < 0)
dev_err(mmc_dev(host->mmc),
"Setting drive strengths failed: %d\n", ret);
}
}
static void tegra_sdhci_parse_pad_autocal_dt(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
struct sdhci_tegra_autocal_offsets *autocal =
&tegra_host->autocal_offsets;
int err;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-up-offset-3v3",
&autocal->pull_up_3v3);
if (err)
autocal->pull_up_3v3 = 0;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-down-offset-3v3",
&autocal->pull_down_3v3);
if (err)
autocal->pull_down_3v3 = 0;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-up-offset-1v8",
&autocal->pull_up_1v8);
if (err)
autocal->pull_up_1v8 = 0;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-down-offset-1v8",
&autocal->pull_down_1v8);
if (err)
autocal->pull_down_1v8 = 0;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-up-offset-sdr104",
&autocal->pull_up_sdr104);
if (err)
autocal->pull_up_sdr104 = autocal->pull_up_1v8;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-down-offset-sdr104",
&autocal->pull_down_sdr104);
if (err)
autocal->pull_down_sdr104 = autocal->pull_down_1v8;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-up-offset-hs400",
&autocal->pull_up_hs400);
if (err)
autocal->pull_up_hs400 = autocal->pull_up_1v8;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-down-offset-hs400",
&autocal->pull_down_hs400);
if (err)
autocal->pull_down_hs400 = autocal->pull_down_1v8;
/*
* Different fail-safe drive strength values based on the signaling
* voltage are applicable for SoCs supporting 3V3 and 1V8 pad controls.
* So, avoid reading below device tree properties for SoCs that don't
* have NVQUIRK_NEEDS_PAD_CONTROL.
*/
if (!(tegra_host->soc_data->nvquirks & NVQUIRK_NEEDS_PAD_CONTROL))
return;
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-up-offset-3v3-timeout",
&autocal->pull_up_3v3_timeout);
if (err) {
if (!IS_ERR(tegra_host->pinctrl_state_3v3) &&
(tegra_host->pinctrl_state_3v3_drv == NULL))
pr_warn("%s: Missing autocal timeout 3v3-pad drvs\n",
mmc_hostname(host->mmc));
autocal->pull_up_3v3_timeout = 0;
}
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-down-offset-3v3-timeout",
&autocal->pull_down_3v3_timeout);
if (err) {
if (!IS_ERR(tegra_host->pinctrl_state_3v3) &&
(tegra_host->pinctrl_state_3v3_drv == NULL))
pr_warn("%s: Missing autocal timeout 3v3-pad drvs\n",
mmc_hostname(host->mmc));
autocal->pull_down_3v3_timeout = 0;
}
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-up-offset-1v8-timeout",
&autocal->pull_up_1v8_timeout);
if (err) {
if (!IS_ERR(tegra_host->pinctrl_state_1v8) &&
(tegra_host->pinctrl_state_1v8_drv == NULL))
pr_warn("%s: Missing autocal timeout 1v8-pad drvs\n",
mmc_hostname(host->mmc));
autocal->pull_up_1v8_timeout = 0;
}
err = device_property_read_u32(host->mmc->parent,
"nvidia,pad-autocal-pull-down-offset-1v8-timeout",
&autocal->pull_down_1v8_timeout);
if (err) {
if (!IS_ERR(tegra_host->pinctrl_state_1v8) &&
(tegra_host->pinctrl_state_1v8_drv == NULL))
pr_warn("%s: Missing autocal timeout 1v8-pad drvs\n",
mmc_hostname(host->mmc));
autocal->pull_down_1v8_timeout = 0;
}
}
static void tegra_sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
ktime_t since_calib = ktime_sub(ktime_get(), tegra_host->last_calib);
/* 100 ms calibration interval is specified in the TRM */
if (ktime_to_ms(since_calib) > 100) {
tegra_sdhci_pad_autocalib(host);
tegra_host->last_calib = ktime_get();
}
sdhci_request(mmc, mrq);
}
static void tegra_sdhci_parse_tap_and_trim(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
int err;
err = device_property_read_u32(host->mmc->parent, "nvidia,default-tap",
&tegra_host->default_tap);
if (err)
tegra_host->default_tap = 0;
err = device_property_read_u32(host->mmc->parent, "nvidia,default-trim",
&tegra_host->default_trim);
if (err)
tegra_host->default_trim = 0;
err = device_property_read_u32(host->mmc->parent, "nvidia,dqs-trim",
&tegra_host->dqs_trim);
if (err)
tegra_host->dqs_trim = 0x11;
}
static void tegra_sdhci_parse_dt(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
if (device_property_read_bool(host->mmc->parent, "supports-cqe"))
tegra_host->enable_hwcq = true;
else
tegra_host->enable_hwcq = false;
tegra_sdhci_parse_pad_autocal_dt(host);
tegra_sdhci_parse_tap_and_trim(host);
}
static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
unsigned long host_clk;
if (!clock)
return sdhci_set_clock(host, clock);
/*
* In DDR50/52 modes the Tegra SDHCI controllers require the SDHCI
* divider to be configured to divided the host clock by two. The SDHCI
* clock divider is calculated as part of sdhci_set_clock() by
* sdhci_calc_clk(). The divider is calculated from host->max_clk and
* the requested clock rate.
*
* By setting the host->max_clk to clock * 2 the divider calculation
* will always result in the correct value for DDR50/52 modes,
* regardless of clock rate rounding, which may happen if the value
* from clk_get_rate() is used.
*/
host_clk = tegra_host->ddr_signaling ? clock * 2 : clock;
clk_set_rate(pltfm_host->clk, host_clk);
tegra_host->curr_clk_rate = host_clk;
if (tegra_host->ddr_signaling)
host->max_clk = host_clk;
else
host->max_clk = clk_get_rate(pltfm_host->clk);
sdhci_set_clock(host, clock);
if (tegra_host->pad_calib_required) {
tegra_sdhci_pad_autocalib(host);
tegra_host->pad_calib_required = false;
}
}
static void tegra_sdhci_hs400_enhanced_strobe(struct mmc_host *mmc,
struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
u32 val;
val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_SYS_SW_CTRL);
if (ios->enhanced_strobe) {
val |= SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE;
/*
* When CMD13 is sent from mmc_select_hs400es() after
* switching to HS400ES mode, the bus is operating at
* either MMC_HIGH_26_MAX_DTR or MMC_HIGH_52_MAX_DTR.
* To meet Tegra SDHCI requirement at HS400ES mode, force SDHCI
* interface clock to MMC_HS200_MAX_DTR (200 MHz) so that host
* controller CAR clock and the interface clock are rate matched.
*/
tegra_sdhci_set_clock(host, MMC_HS200_MAX_DTR);
} else {
val &= ~SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE;
}
sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_SYS_SW_CTRL);
}
static unsigned int tegra_sdhci_get_max_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
return clk_round_rate(pltfm_host->clk, UINT_MAX);
}
static void tegra_sdhci_set_dqs_trim(struct sdhci_host *host, u8 trim)
{
u32 val;
val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CAP_OVERRIDES);
val &= ~SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_MASK;
val |= trim << SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT;
sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_CAP_OVERRIDES);
}
static void tegra_sdhci_hs400_dll_cal(struct sdhci_host *host)
{
u32 reg;
int err;
reg = sdhci_readl(host, SDHCI_TEGRA_VENDOR_DLLCAL_CFG);
reg |= SDHCI_TEGRA_DLLCAL_CALIBRATE;
sdhci_writel(host, reg, SDHCI_TEGRA_VENDOR_DLLCAL_CFG);
/* 1 ms sleep, 5 ms timeout */
err = readl_poll_timeout(host->ioaddr + SDHCI_TEGRA_VENDOR_DLLCAL_STA,
reg, !(reg & SDHCI_TEGRA_DLLCAL_STA_ACTIVE),
1000, 5000);
if (err)
dev_err(mmc_dev(host->mmc),
"HS400 delay line calibration timed out\n");
}
static void tegra_sdhci_tap_correction(struct sdhci_host *host, u8 thd_up,
u8 thd_low, u8 fixed_tap)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
u32 val, tun_status;
u8 word, bit, edge1, tap, window;
bool tap_result;
bool start_fail = false;
bool start_pass = false;
bool end_pass = false;
bool first_fail = false;
bool first_pass = false;
u8 start_pass_tap = 0;
u8 end_pass_tap = 0;
u8 first_fail_tap = 0;
u8 first_pass_tap = 0;
u8 total_tuning_words = host->tuning_loop_count / TUNING_WORD_BIT_SIZE;
/*
* Read auto-tuned results and extract good valid passing window by
* filtering out un-wanted bubble/partial/merged windows.
*/
for (word = 0; word < total_tuning_words; word++) {
val = sdhci_readl(host, SDHCI_VNDR_TUN_CTRL0_0);
val &= ~SDHCI_VNDR_TUN_CTRL0_TUN_WORD_SEL_MASK;
val |= word;
sdhci_writel(host, val, SDHCI_VNDR_TUN_CTRL0_0);
tun_status = sdhci_readl(host, SDHCI_TEGRA_VNDR_TUN_STATUS0);
bit = 0;
while (bit < TUNING_WORD_BIT_SIZE) {
tap = word * TUNING_WORD_BIT_SIZE + bit;
tap_result = tun_status & (1 << bit);
if (!tap_result && !start_fail) {
start_fail = true;
if (!first_fail) {
first_fail_tap = tap;
first_fail = true;
}
} else if (tap_result && start_fail && !start_pass) {
start_pass_tap = tap;
start_pass = true;
if (!first_pass) {
first_pass_tap = tap;
first_pass = true;
}
} else if (!tap_result && start_fail && start_pass &&
!end_pass) {
end_pass_tap = tap - 1;
end_pass = true;
} else if (tap_result && start_pass && start_fail &&
end_pass) {
window = end_pass_tap - start_pass_tap;
/* discard merged window and bubble window */
if (window >= thd_up || window < thd_low) {
start_pass_tap = tap;
end_pass = false;
} else {
/* set tap at middle of valid window */
tap = start_pass_tap + window / 2;
tegra_host->tuned_tap_delay = tap;
return;
}
}
bit++;
}
}
if (!first_fail) {
WARN(1, "no edge detected, continue with hw tuned delay.\n");
} else if (first_pass) {
/* set tap location at fixed tap relative to the first edge */
edge1 = first_fail_tap + (first_pass_tap - first_fail_tap) / 2;
if (edge1 - 1 > fixed_tap)
tegra_host->tuned_tap_delay = edge1 - fixed_tap;
else
tegra_host->tuned_tap_delay = edge1 + fixed_tap;
}
}
static void tegra_sdhci_post_tuning(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
u32 avg_tap_dly, val, min_tap_dly, max_tap_dly;
u8 fixed_tap, start_tap, end_tap, window_width;
u8 thdupper, thdlower;
u8 num_iter;
u32 clk_rate_mhz, period_ps, bestcase, worstcase;
/* retain HW tuned tap to use incase if no correction is needed */
val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL);
tegra_host->tuned_tap_delay = (val & SDHCI_CLOCK_CTRL_TAP_MASK) >>
SDHCI_CLOCK_CTRL_TAP_SHIFT;
if (soc_data->min_tap_delay && soc_data->max_tap_delay) {
min_tap_dly = soc_data->min_tap_delay;
max_tap_dly = soc_data->max_tap_delay;
clk_rate_mhz = tegra_host->curr_clk_rate / USEC_PER_SEC;
period_ps = USEC_PER_SEC / clk_rate_mhz;
bestcase = period_ps / min_tap_dly;
worstcase = period_ps / max_tap_dly;
/*
* Upper and Lower bound thresholds used to detect merged and
* bubble windows
*/
thdupper = (2 * worstcase + bestcase) / 2;
thdlower = worstcase / 4;
/*
* fixed tap is used when HW tuning result contains single edge
* and tap is set at fixed tap delay relative to the first edge
*/
avg_tap_dly = (period_ps * 2) / (min_tap_dly + max_tap_dly);
fixed_tap = avg_tap_dly / 2;
val = sdhci_readl(host, SDHCI_TEGRA_VNDR_TUN_STATUS1);
start_tap = val & SDHCI_TEGRA_VNDR_TUN_STATUS1_TAP_MASK;
end_tap = (val >> SDHCI_TEGRA_VNDR_TUN_STATUS1_END_TAP_SHIFT) &
SDHCI_TEGRA_VNDR_TUN_STATUS1_TAP_MASK;
window_width = end_tap - start_tap;
num_iter = host->tuning_loop_count;
/*
* partial window includes edges of the tuning range.
* merged window includes more taps so window width is higher
* than upper threshold.
*/
if (start_tap == 0 || (end_tap == (num_iter - 1)) ||
(end_tap == num_iter - 2) || window_width >= thdupper) {
pr_debug("%s: Apply tuning correction\n",
mmc_hostname(host->mmc));
tegra_sdhci_tap_correction(host, thdupper, thdlower,
fixed_tap);
}
}
tegra_sdhci_set_tap(host, tegra_host->tuned_tap_delay);
}
static int tegra_sdhci_execute_hw_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host = mmc_priv(mmc);
int err;
err = sdhci_execute_tuning(mmc, opcode);
if (!err && !host->tuning_err)
tegra_sdhci_post_tuning(host);
return err;
}
static void tegra_sdhci_set_uhs_signaling(struct sdhci_host *host,
unsigned timing)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
bool set_default_tap = false;
bool set_dqs_trim = false;
bool do_hs400_dll_cal = false;
u8 iter = TRIES_256;
u32 val;