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linux-zen-server/drivers/ufs/host/ufs-mediatek.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 MediaTek Inc.
* Authors:
* Stanley Chu <stanley.chu@mediatek.com>
* Peter Wang <peter.wang@mediatek.com>
*/
#include <linux/arm-smccc.h>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/soc/mediatek/mtk_sip_svc.h>
#include <ufs/ufshcd.h>
#include "ufshcd-pltfrm.h"
#include <ufs/ufs_quirks.h>
#include <ufs/unipro.h>
#include "ufs-mediatek.h"
#define CREATE_TRACE_POINTS
#include "ufs-mediatek-trace.h"
static const struct ufs_dev_quirk ufs_mtk_dev_fixups[] = {
{ .wmanufacturerid = UFS_ANY_VENDOR,
.model = UFS_ANY_MODEL,
.quirk = UFS_DEVICE_QUIRK_DELAY_AFTER_LPM |
UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM },
{ .wmanufacturerid = UFS_VENDOR_SKHYNIX,
.model = "H9HQ21AFAMZDAR",
.quirk = UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES },
{}
};
static const struct of_device_id ufs_mtk_of_match[] = {
{ .compatible = "mediatek,mt8183-ufshci" },
{},
};
/*
* Details of UIC Errors
*/
static const char *const ufs_uic_err_str[] = {
"PHY Adapter Layer",
"Data Link Layer",
"Network Link Layer",
"Transport Link Layer",
"DME"
};
static const char *const ufs_uic_pa_err_str[] = {
"PHY error on Lane 0",
"PHY error on Lane 1",
"PHY error on Lane 2",
"PHY error on Lane 3",
"Generic PHY Adapter Error. This should be the LINERESET indication"
};
static const char *const ufs_uic_dl_err_str[] = {
"NAC_RECEIVED",
"TCx_REPLAY_TIMER_EXPIRED",
"AFCx_REQUEST_TIMER_EXPIRED",
"FCx_PROTECTION_TIMER_EXPIRED",
"CRC_ERROR",
"RX_BUFFER_OVERFLOW",
"MAX_FRAME_LENGTH_EXCEEDED",
"WRONG_SEQUENCE_NUMBER",
"AFC_FRAME_SYNTAX_ERROR",
"NAC_FRAME_SYNTAX_ERROR",
"EOF_SYNTAX_ERROR",
"FRAME_SYNTAX_ERROR",
"BAD_CTRL_SYMBOL_TYPE",
"PA_INIT_ERROR",
"PA_ERROR_IND_RECEIVED",
"PA_INIT"
};
static bool ufs_mtk_is_boost_crypt_enabled(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
return !!(host->caps & UFS_MTK_CAP_BOOST_CRYPT_ENGINE);
}
static bool ufs_mtk_is_va09_supported(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
return !!(host->caps & UFS_MTK_CAP_VA09_PWR_CTRL);
}
static bool ufs_mtk_is_broken_vcc(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
return !!(host->caps & UFS_MTK_CAP_BROKEN_VCC);
}
static bool ufs_mtk_is_pmc_via_fastauto(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
return !!(host->caps & UFS_MTK_CAP_PMC_VIA_FASTAUTO);
}
static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba, bool enable)
{
u32 tmp;
if (enable) {
ufshcd_dme_get(hba,
UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
tmp = tmp |
(1 << RX_SYMBOL_CLK_GATE_EN) |
(1 << SYS_CLK_GATE_EN) |
(1 << TX_CLK_GATE_EN);
ufshcd_dme_set(hba,
UIC_ARG_MIB(VS_SAVEPOWERCONTROL), tmp);
ufshcd_dme_get(hba,
UIC_ARG_MIB(VS_DEBUGCLOCKENABLE), &tmp);
tmp = tmp & ~(1 << TX_SYMBOL_CLK_REQ_FORCE);
ufshcd_dme_set(hba,
UIC_ARG_MIB(VS_DEBUGCLOCKENABLE), tmp);
} else {
ufshcd_dme_get(hba,
UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
tmp = tmp & ~((1 << RX_SYMBOL_CLK_GATE_EN) |
(1 << SYS_CLK_GATE_EN) |
(1 << TX_CLK_GATE_EN));
ufshcd_dme_set(hba,
UIC_ARG_MIB(VS_SAVEPOWERCONTROL), tmp);
ufshcd_dme_get(hba,
UIC_ARG_MIB(VS_DEBUGCLOCKENABLE), &tmp);
tmp = tmp | (1 << TX_SYMBOL_CLK_REQ_FORCE);
ufshcd_dme_set(hba,
UIC_ARG_MIB(VS_DEBUGCLOCKENABLE), tmp);
}
}
static void ufs_mtk_crypto_enable(struct ufs_hba *hba)
{
struct arm_smccc_res res;
ufs_mtk_crypto_ctrl(res, 1);
if (res.a0) {
dev_info(hba->dev, "%s: crypto enable failed, err: %lu\n",
__func__, res.a0);
hba->caps &= ~UFSHCD_CAP_CRYPTO;
}
}
static void ufs_mtk_host_reset(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
reset_control_assert(host->hci_reset);
reset_control_assert(host->crypto_reset);
reset_control_assert(host->unipro_reset);
usleep_range(100, 110);
reset_control_deassert(host->unipro_reset);
reset_control_deassert(host->crypto_reset);
reset_control_deassert(host->hci_reset);
}
static void ufs_mtk_init_reset_control(struct ufs_hba *hba,
struct reset_control **rc,
char *str)
{
*rc = devm_reset_control_get(hba->dev, str);
if (IS_ERR(*rc)) {
dev_info(hba->dev, "Failed to get reset control %s: %ld\n",
str, PTR_ERR(*rc));
*rc = NULL;
}
}
static void ufs_mtk_init_reset(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
ufs_mtk_init_reset_control(hba, &host->hci_reset,
"hci_rst");
ufs_mtk_init_reset_control(hba, &host->unipro_reset,
"unipro_rst");
ufs_mtk_init_reset_control(hba, &host->crypto_reset,
"crypto_rst");
}
static int ufs_mtk_hce_enable_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
if (status == PRE_CHANGE) {
if (host->unipro_lpm) {
hba->vps->hba_enable_delay_us = 0;
} else {
hba->vps->hba_enable_delay_us = 600;
ufs_mtk_host_reset(hba);
}
if (hba->caps & UFSHCD_CAP_CRYPTO)
ufs_mtk_crypto_enable(hba);
if (host->caps & UFS_MTK_CAP_DISABLE_AH8) {
ufshcd_writel(hba, 0,
REG_AUTO_HIBERNATE_IDLE_TIMER);
hba->capabilities &= ~MASK_AUTO_HIBERN8_SUPPORT;
hba->ahit = 0;
}
/*
* Turn on CLK_CG early to bypass abnormal ERR_CHK signal
* to prevent host hang issue
*/
ufshcd_writel(hba,
ufshcd_readl(hba, REG_UFS_XOUFS_CTRL) | 0x80,
REG_UFS_XOUFS_CTRL);
}
return 0;
}
static int ufs_mtk_bind_mphy(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct device *dev = hba->dev;
struct device_node *np = dev->of_node;
int err = 0;
host->mphy = devm_of_phy_get_by_index(dev, np, 0);
if (host->mphy == ERR_PTR(-EPROBE_DEFER)) {
/*
* UFS driver might be probed before the phy driver does.
* In that case we would like to return EPROBE_DEFER code.
*/
err = -EPROBE_DEFER;
dev_info(dev,
"%s: required phy hasn't probed yet. err = %d\n",
__func__, err);
} else if (IS_ERR(host->mphy)) {
err = PTR_ERR(host->mphy);
if (err != -ENODEV) {
dev_info(dev, "%s: PHY get failed %d\n", __func__,
err);
}
}
if (err)
host->mphy = NULL;
/*
* Allow unbound mphy because not every platform needs specific
* mphy control.
*/
if (err == -ENODEV)
err = 0;
return err;
}
static int ufs_mtk_setup_ref_clk(struct ufs_hba *hba, bool on)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct arm_smccc_res res;
ktime_t timeout, time_checked;
u32 value;
if (host->ref_clk_enabled == on)
return 0;
ufs_mtk_ref_clk_notify(on, PRE_CHANGE, res);
if (on) {
ufshcd_writel(hba, REFCLK_REQUEST, REG_UFS_REFCLK_CTRL);
} else {
ufshcd_delay_us(host->ref_clk_gating_wait_us, 10);
ufshcd_writel(hba, REFCLK_RELEASE, REG_UFS_REFCLK_CTRL);
}
/* Wait for ack */
timeout = ktime_add_us(ktime_get(), REFCLK_REQ_TIMEOUT_US);
do {
time_checked = ktime_get();
value = ufshcd_readl(hba, REG_UFS_REFCLK_CTRL);
/* Wait until ack bit equals to req bit */
if (((value & REFCLK_ACK) >> 1) == (value & REFCLK_REQUEST))
goto out;
usleep_range(100, 200);
} while (ktime_before(time_checked, timeout));
dev_err(hba->dev, "missing ack of refclk req, reg: 0x%x\n", value);
ufs_mtk_ref_clk_notify(host->ref_clk_enabled, POST_CHANGE, res);
return -ETIMEDOUT;
out:
host->ref_clk_enabled = on;
if (on)
ufshcd_delay_us(host->ref_clk_ungating_wait_us, 10);
ufs_mtk_ref_clk_notify(on, POST_CHANGE, res);
return 0;
}
static void ufs_mtk_setup_ref_clk_wait_us(struct ufs_hba *hba,
u16 gating_us)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
if (hba->dev_info.clk_gating_wait_us) {
host->ref_clk_gating_wait_us =
hba->dev_info.clk_gating_wait_us;
} else {
host->ref_clk_gating_wait_us = gating_us;
}
host->ref_clk_ungating_wait_us = REFCLK_DEFAULT_WAIT_US;
}
static void ufs_mtk_dbg_sel(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
if (((host->ip_ver >> 16) & 0xFF) >= 0x36) {
ufshcd_writel(hba, 0x820820, REG_UFS_DEBUG_SEL);
ufshcd_writel(hba, 0x0, REG_UFS_DEBUG_SEL_B0);
ufshcd_writel(hba, 0x55555555, REG_UFS_DEBUG_SEL_B1);
ufshcd_writel(hba, 0xaaaaaaaa, REG_UFS_DEBUG_SEL_B2);
ufshcd_writel(hba, 0xffffffff, REG_UFS_DEBUG_SEL_B3);
} else {
ufshcd_writel(hba, 0x20, REG_UFS_DEBUG_SEL);
}
}
static void ufs_mtk_wait_idle_state(struct ufs_hba *hba,
unsigned long retry_ms)
{
u64 timeout, time_checked;
u32 val, sm;
bool wait_idle;
/* cannot use plain ktime_get() in suspend */
timeout = ktime_get_mono_fast_ns() + retry_ms * 1000000UL;
/* wait a specific time after check base */
udelay(10);
wait_idle = false;
do {
time_checked = ktime_get_mono_fast_ns();
ufs_mtk_dbg_sel(hba);
val = ufshcd_readl(hba, REG_UFS_PROBE);
sm = val & 0x1f;
/*
* if state is in H8 enter and H8 enter confirm
* wait until return to idle state.
*/
if ((sm >= VS_HIB_ENTER) && (sm <= VS_HIB_EXIT)) {
wait_idle = true;
udelay(50);
continue;
} else if (!wait_idle)
break;
if (wait_idle && (sm == VS_HCE_BASE))
break;
} while (time_checked < timeout);
if (wait_idle && sm != VS_HCE_BASE)
dev_info(hba->dev, "wait idle tmo: 0x%x\n", val);
}
static int ufs_mtk_wait_link_state(struct ufs_hba *hba, u32 state,
unsigned long max_wait_ms)
{
ktime_t timeout, time_checked;
u32 val;
timeout = ktime_add_ms(ktime_get(), max_wait_ms);
do {
time_checked = ktime_get();
ufs_mtk_dbg_sel(hba);
val = ufshcd_readl(hba, REG_UFS_PROBE);
val = val >> 28;
if (val == state)
return 0;
/* Sleep for max. 200us */
usleep_range(100, 200);
} while (ktime_before(time_checked, timeout));
if (val == state)
return 0;
return -ETIMEDOUT;
}
static int ufs_mtk_mphy_power_on(struct ufs_hba *hba, bool on)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct phy *mphy = host->mphy;
struct arm_smccc_res res;
int ret = 0;
if (!mphy || !(on ^ host->mphy_powered_on))
return 0;
if (on) {
if (ufs_mtk_is_va09_supported(hba)) {
ret = regulator_enable(host->reg_va09);
if (ret < 0)
goto out;
/* wait 200 us to stablize VA09 */
usleep_range(200, 210);
ufs_mtk_va09_pwr_ctrl(res, 1);
}
phy_power_on(mphy);
} else {
phy_power_off(mphy);
if (ufs_mtk_is_va09_supported(hba)) {
ufs_mtk_va09_pwr_ctrl(res, 0);
ret = regulator_disable(host->reg_va09);
}
}
out:
if (ret) {
dev_info(hba->dev,
"failed to %s va09: %d\n",
on ? "enable" : "disable",
ret);
} else {
host->mphy_powered_on = on;
}
return ret;
}
static int ufs_mtk_get_host_clk(struct device *dev, const char *name,
struct clk **clk_out)
{
struct clk *clk;
int err = 0;
clk = devm_clk_get(dev, name);
if (IS_ERR(clk))
err = PTR_ERR(clk);
else
*clk_out = clk;
return err;
}
static void ufs_mtk_boost_crypt(struct ufs_hba *hba, bool boost)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct ufs_mtk_crypt_cfg *cfg;
struct regulator *reg;
int volt, ret;
if (!ufs_mtk_is_boost_crypt_enabled(hba))
return;
cfg = host->crypt;
volt = cfg->vcore_volt;
reg = cfg->reg_vcore;
ret = clk_prepare_enable(cfg->clk_crypt_mux);
if (ret) {
dev_info(hba->dev, "clk_prepare_enable(): %d\n",
ret);
return;
}
if (boost) {
ret = regulator_set_voltage(reg, volt, INT_MAX);
if (ret) {
dev_info(hba->dev,
"failed to set vcore to %d\n", volt);
goto out;
}
ret = clk_set_parent(cfg->clk_crypt_mux,
cfg->clk_crypt_perf);
if (ret) {
dev_info(hba->dev,
"failed to set clk_crypt_perf\n");
regulator_set_voltage(reg, 0, INT_MAX);
goto out;
}
} else {
ret = clk_set_parent(cfg->clk_crypt_mux,
cfg->clk_crypt_lp);
if (ret) {
dev_info(hba->dev,
"failed to set clk_crypt_lp\n");
goto out;
}
ret = regulator_set_voltage(reg, 0, INT_MAX);
if (ret) {
dev_info(hba->dev,
"failed to set vcore to MIN\n");
}
}
out:
clk_disable_unprepare(cfg->clk_crypt_mux);
}
static int ufs_mtk_init_host_clk(struct ufs_hba *hba, const char *name,
struct clk **clk)
{
int ret;
ret = ufs_mtk_get_host_clk(hba->dev, name, clk);
if (ret) {
dev_info(hba->dev, "%s: failed to get %s: %d", __func__,
name, ret);
}
return ret;
}
static void ufs_mtk_init_boost_crypt(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct ufs_mtk_crypt_cfg *cfg;
struct device *dev = hba->dev;
struct regulator *reg;
u32 volt;
host->crypt = devm_kzalloc(dev, sizeof(*(host->crypt)),
GFP_KERNEL);
if (!host->crypt)
goto disable_caps;
reg = devm_regulator_get_optional(dev, "dvfsrc-vcore");
if (IS_ERR(reg)) {
dev_info(dev, "failed to get dvfsrc-vcore: %ld",
PTR_ERR(reg));
goto disable_caps;
}
if (of_property_read_u32(dev->of_node, "boost-crypt-vcore-min",
&volt)) {
dev_info(dev, "failed to get boost-crypt-vcore-min");
goto disable_caps;
}
cfg = host->crypt;
if (ufs_mtk_init_host_clk(hba, "crypt_mux",
&cfg->clk_crypt_mux))
goto disable_caps;
if (ufs_mtk_init_host_clk(hba, "crypt_lp",
&cfg->clk_crypt_lp))
goto disable_caps;
if (ufs_mtk_init_host_clk(hba, "crypt_perf",
&cfg->clk_crypt_perf))
goto disable_caps;
cfg->reg_vcore = reg;
cfg->vcore_volt = volt;
host->caps |= UFS_MTK_CAP_BOOST_CRYPT_ENGINE;
disable_caps:
return;
}
static void ufs_mtk_init_va09_pwr_ctrl(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
host->reg_va09 = regulator_get(hba->dev, "va09");
if (IS_ERR(host->reg_va09))
dev_info(hba->dev, "failed to get va09");
else
host->caps |= UFS_MTK_CAP_VA09_PWR_CTRL;
}
static void ufs_mtk_init_host_caps(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct device_node *np = hba->dev->of_node;
if (of_property_read_bool(np, "mediatek,ufs-boost-crypt"))
ufs_mtk_init_boost_crypt(hba);
if (of_property_read_bool(np, "mediatek,ufs-support-va09"))
ufs_mtk_init_va09_pwr_ctrl(hba);
if (of_property_read_bool(np, "mediatek,ufs-disable-ah8"))
host->caps |= UFS_MTK_CAP_DISABLE_AH8;
if (of_property_read_bool(np, "mediatek,ufs-broken-vcc"))
host->caps |= UFS_MTK_CAP_BROKEN_VCC;
if (of_property_read_bool(np, "mediatek,ufs-pmc-via-fastauto"))
host->caps |= UFS_MTK_CAP_PMC_VIA_FASTAUTO;
dev_info(hba->dev, "caps: 0x%x", host->caps);
}
static void ufs_mtk_boost_pm_qos(struct ufs_hba *hba, bool boost)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
if (!host || !host->pm_qos_init)
return;
cpu_latency_qos_update_request(&host->pm_qos_req,
boost ? 0 : PM_QOS_DEFAULT_VALUE);
}
static void ufs_mtk_scale_perf(struct ufs_hba *hba, bool scale_up)
{
ufs_mtk_boost_crypt(hba, scale_up);
ufs_mtk_boost_pm_qos(hba, scale_up);
}
static void ufs_mtk_pwr_ctrl(struct ufs_hba *hba, bool on)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
if (on) {
phy_power_on(host->mphy);
ufs_mtk_setup_ref_clk(hba, on);
if (!ufshcd_is_clkscaling_supported(hba))
ufs_mtk_scale_perf(hba, on);
} else {
if (!ufshcd_is_clkscaling_supported(hba))
ufs_mtk_scale_perf(hba, on);
ufs_mtk_setup_ref_clk(hba, on);
phy_power_off(host->mphy);
}
}
/**
* ufs_mtk_setup_clocks - enables/disable clocks
* @hba: host controller instance
* @on: If true, enable clocks else disable them.
* @status: PRE_CHANGE or POST_CHANGE notify
*
* Returns 0 on success, non-zero on failure.
*/
static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,
enum ufs_notify_change_status status)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
bool clk_pwr_off = false;
int ret = 0;
/*
* In case ufs_mtk_init() is not yet done, simply ignore.
* This ufs_mtk_setup_clocks() shall be called from
* ufs_mtk_init() after init is done.
*/
if (!host)
return 0;
if (!on && status == PRE_CHANGE) {
if (ufshcd_is_link_off(hba)) {
clk_pwr_off = true;
} else if (ufshcd_is_link_hibern8(hba) ||
(!ufshcd_can_hibern8_during_gating(hba) &&
ufshcd_is_auto_hibern8_enabled(hba))) {
/*
* Gate ref-clk and poweroff mphy if link state is in
* OFF or Hibern8 by either Auto-Hibern8 or
* ufshcd_link_state_transition().
*/
ret = ufs_mtk_wait_link_state(hba,
VS_LINK_HIBERN8,
15);
if (!ret)
clk_pwr_off = true;
}
if (clk_pwr_off)
ufs_mtk_pwr_ctrl(hba, false);
} else if (on && status == POST_CHANGE) {
ufs_mtk_pwr_ctrl(hba, true);
}
return ret;
}
static void ufs_mtk_get_controller_version(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
int ret, ver = 0;
if (host->hw_ver.major)
return;
/* Set default (minimum) version anyway */
host->hw_ver.major = 2;
ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_LOCALVERINFO), &ver);
if (!ret) {
if (ver >= UFS_UNIPRO_VER_1_8) {
host->hw_ver.major = 3;
/*
* Fix HCI version for some platforms with
* incorrect version
*/
if (hba->ufs_version < ufshci_version(3, 0))
hba->ufs_version = ufshci_version(3, 0);
}
}
}
static u32 ufs_mtk_get_ufs_hci_version(struct ufs_hba *hba)
{
return hba->ufs_version;
}
/**
* ufs_mtk_init_clocks - Init mtk driver private clocks
*
* @hba: per adapter instance
*/
static void ufs_mtk_init_clocks(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct list_head *head = &hba->clk_list_head;
struct ufs_mtk_clk *mclk = &host->mclk;
struct ufs_clk_info *clki, *clki_tmp;
/*
* Find private clocks and store them in struct ufs_mtk_clk.
* Remove "ufs_sel_min_src" and "ufs_sel_min_src" from list to avoid
* being switched on/off in clock gating.
*/
list_for_each_entry_safe(clki, clki_tmp, head, list) {
if (!strcmp(clki->name, "ufs_sel")) {
host->mclk.ufs_sel_clki = clki;
} else if (!strcmp(clki->name, "ufs_sel_max_src")) {
host->mclk.ufs_sel_max_clki = clki;
clk_disable_unprepare(clki->clk);
list_del(&clki->list);
} else if (!strcmp(clki->name, "ufs_sel_min_src")) {
host->mclk.ufs_sel_min_clki = clki;
clk_disable_unprepare(clki->clk);
list_del(&clki->list);
}
}
if (!mclk->ufs_sel_clki || !mclk->ufs_sel_max_clki ||
!mclk->ufs_sel_min_clki) {
hba->caps &= ~UFSHCD_CAP_CLK_SCALING;
dev_info(hba->dev,
"%s: Clk-scaling not ready. Feature disabled.",
__func__);
}
}
#define MAX_VCC_NAME 30
static int ufs_mtk_vreg_fix_vcc(struct ufs_hba *hba)
{
struct ufs_vreg_info *info = &hba->vreg_info;
struct device_node *np = hba->dev->of_node;
struct device *dev = hba->dev;
char vcc_name[MAX_VCC_NAME];
struct arm_smccc_res res;
int err, ver;
if (hba->vreg_info.vcc)
return 0;
if (of_property_read_bool(np, "mediatek,ufs-vcc-by-num")) {
ufs_mtk_get_vcc_num(res);
if (res.a1 > UFS_VCC_NONE && res.a1 < UFS_VCC_MAX)
snprintf(vcc_name, MAX_VCC_NAME, "vcc-opt%lu", res.a1);
else
return -ENODEV;
} else if (of_property_read_bool(np, "mediatek,ufs-vcc-by-ver")) {
ver = (hba->dev_info.wspecversion & 0xF00) >> 8;
snprintf(vcc_name, MAX_VCC_NAME, "vcc-ufs%u", ver);
} else {
return 0;
}
err = ufshcd_populate_vreg(dev, vcc_name, &info->vcc);
if (err)
return err;
err = ufshcd_get_vreg(dev, info->vcc);
if (err)
return err;
err = regulator_enable(info->vcc->reg);
if (!err) {
info->vcc->enabled = true;
dev_info(dev, "%s: %s enabled\n", __func__, vcc_name);
}
return err;
}
static void ufs_mtk_vreg_fix_vccqx(struct ufs_hba *hba)
{
struct ufs_vreg_info *info = &hba->vreg_info;
struct ufs_vreg **vreg_on, **vreg_off;
if (hba->dev_info.wspecversion >= 0x0300) {
vreg_on = &info->vccq;
vreg_off = &info->vccq2;
} else {
vreg_on = &info->vccq2;
vreg_off = &info->vccq;
}
if (*vreg_on)
(*vreg_on)->always_on = true;
if (*vreg_off) {
regulator_disable((*vreg_off)->reg);
devm_kfree(hba->dev, (*vreg_off)->name);
devm_kfree(hba->dev, *vreg_off);
*vreg_off = NULL;
}
}
/**
* ufs_mtk_init - find other essential mmio bases
* @hba: host controller instance
*
* Binds PHY with controller and powers up PHY enabling clocks
* and regulators.
*
* Returns -EPROBE_DEFER if binding fails, returns negative error
* on phy power up failure and returns zero on success.
*/
static int ufs_mtk_init(struct ufs_hba *hba)
{
const struct of_device_id *id;
struct device *dev = hba->dev;
struct ufs_mtk_host *host;
int err = 0;
host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
if (!host) {
err = -ENOMEM;
dev_info(dev, "%s: no memory for mtk ufs host\n", __func__);
goto out;
}
host->hba = hba;
ufshcd_set_variant(hba, host);
id = of_match_device(ufs_mtk_of_match, dev);
if (!id) {
err = -EINVAL;
goto out;
}
/* Initialize host capability */
ufs_mtk_init_host_caps(hba);
err = ufs_mtk_bind_mphy(hba);
if (err)
goto out_variant_clear;
ufs_mtk_init_reset(hba);
/* Enable runtime autosuspend */
hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
/* Enable clock-gating */
hba->caps |= UFSHCD_CAP_CLK_GATING;
/* Enable inline encryption */
hba->caps |= UFSHCD_CAP_CRYPTO;
/* Enable WriteBooster */
hba->caps |= UFSHCD_CAP_WB_EN;
/* Enable clk scaling*/
hba->caps |= UFSHCD_CAP_CLK_SCALING;
hba->quirks |= UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL;
hba->vps->wb_flush_threshold = UFS_WB_BUF_REMAIN_PERCENT(80);
if (host->caps & UFS_MTK_CAP_DISABLE_AH8)
hba->caps |= UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
ufs_mtk_init_clocks(hba);
/*
* ufshcd_vops_init() is invoked after
* ufshcd_setup_clock(true) in ufshcd_hba_init() thus
* phy clock setup is skipped.
*
* Enable phy clocks specifically here.
*/
ufs_mtk_mphy_power_on(hba, true);
ufs_mtk_setup_clocks(hba, true, POST_CHANGE);
host->ip_ver = ufshcd_readl(hba, REG_UFS_MTK_IP_VER);
/* Initialize pm-qos request */
cpu_latency_qos_add_request(&host->pm_qos_req, PM_QOS_DEFAULT_VALUE);
host->pm_qos_init = true;
goto out;
out_variant_clear:
ufshcd_set_variant(hba, NULL);
out:
return err;
}
static bool ufs_mtk_pmc_via_fastauto(struct ufs_hba *hba,
struct ufs_pa_layer_attr *dev_req_params)
{
if (!ufs_mtk_is_pmc_via_fastauto(hba))
return false;
if (dev_req_params->hs_rate == hba->pwr_info.hs_rate)
return false;
if (dev_req_params->pwr_tx != FAST_MODE &&
dev_req_params->gear_tx < UFS_HS_G4)
return false;
if (dev_req_params->pwr_rx != FAST_MODE &&
dev_req_params->gear_rx < UFS_HS_G4)
return false;
return true;
}
static int ufs_mtk_pre_pwr_change(struct ufs_hba *hba,
struct ufs_pa_layer_attr *dev_max_params,
struct ufs_pa_layer_attr *dev_req_params)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct ufs_dev_params host_cap;
int ret;
ufshcd_init_pwr_dev_param(&host_cap);
host_cap.hs_rx_gear = UFS_HS_G5;
host_cap.hs_tx_gear = UFS_HS_G5;
ret = ufshcd_get_pwr_dev_param(&host_cap,
dev_max_params,
dev_req_params);
if (ret) {
pr_info("%s: failed to determine capabilities\n",
__func__);
}
if (ufs_mtk_pmc_via_fastauto(hba, dev_req_params)) {
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), true);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXGEAR), UFS_HS_G1);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), true);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXGEAR), UFS_HS_G1);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVETXDATALANES),
dev_req_params->lane_tx);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVERXDATALANES),
dev_req_params->lane_rx);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HSSERIES),
dev_req_params->hs_rate);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXHSADAPTTYPE),
PA_NO_ADAPT);
ret = ufshcd_uic_change_pwr_mode(hba,
FASTAUTO_MODE << 4 | FASTAUTO_MODE);
if (ret) {
dev_err(hba->dev, "%s: HSG1B FASTAUTO failed ret=%d\n",
__func__, ret);
}
}
if (host->hw_ver.major >= 3) {
ret = ufshcd_dme_configure_adapt(hba,
dev_req_params->gear_tx,
PA_INITIAL_ADAPT);
}
return ret;
}
static int ufs_mtk_pwr_change_notify(struct ufs_hba *hba,
enum ufs_notify_change_status stage,
struct ufs_pa_layer_attr *dev_max_params,
struct ufs_pa_layer_attr *dev_req_params)
{
int ret = 0;
switch (stage) {
case PRE_CHANGE:
ret = ufs_mtk_pre_pwr_change(hba, dev_max_params,
dev_req_params);
break;
case POST_CHANGE:
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int ufs_mtk_unipro_set_lpm(struct ufs_hba *hba, bool lpm)
{
int ret;
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
ret = ufshcd_dme_set(hba,
UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
lpm ? 1 : 0);
if (!ret || !lpm) {
/*
* Forcibly set as non-LPM mode if UIC commands is failed
* to use default hba_enable_delay_us value for re-enabling
* the host.
*/
host->unipro_lpm = lpm;
}
return ret;
}
static int ufs_mtk_pre_link(struct ufs_hba *hba)
{
int ret;
u32 tmp;
ufs_mtk_get_controller_version(hba);
ret = ufs_mtk_unipro_set_lpm(hba, false);
if (ret)
return ret;
/*
* Setting PA_Local_TX_LCC_Enable to 0 before link startup
* to make sure that both host and device TX LCC are disabled
* once link startup is completed.
*/
ret = ufshcd_disable_host_tx_lcc(hba);
if (ret)
return ret;
/* disable deep stall */
ret = ufshcd_dme_get(hba, UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
if (ret)
return ret;
tmp &= ~(1 << 6);
ret = ufshcd_dme_set(hba, UIC_ARG_MIB(VS_SAVEPOWERCONTROL), tmp);
return ret;
}
static void ufs_mtk_setup_clk_gating(struct ufs_hba *hba)
{
u32 ah_ms;
if (ufshcd_is_clkgating_allowed(hba)) {
if (ufshcd_is_auto_hibern8_supported(hba) && hba->ahit)
ah_ms = FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK,
hba->ahit);
else
ah_ms = 10;
ufshcd_clkgate_delay_set(hba->dev, ah_ms + 5);
}
}
static void ufs_mtk_post_link(struct ufs_hba *hba)
{
/* enable unipro clock gating feature */
ufs_mtk_cfg_unipro_cg(hba, true);
/* will be configured during probe hba */
if (ufshcd_is_auto_hibern8_supported(hba))
hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 10) |
FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
ufs_mtk_setup_clk_gating(hba);
}
static int ufs_mtk_link_startup_notify(struct ufs_hba *hba,
enum ufs_notify_change_status stage)
{
int ret = 0;
switch (stage) {
case PRE_CHANGE:
ret = ufs_mtk_pre_link(hba);
break;
case POST_CHANGE:
ufs_mtk_post_link(hba);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int ufs_mtk_device_reset(struct ufs_hba *hba)
{
struct arm_smccc_res res;
/* disable hba before device reset */
ufshcd_hba_stop(hba);
ufs_mtk_device_reset_ctrl(0, res);
/*
* The reset signal is active low. UFS devices shall detect
* more than or equal to 1us of positive or negative RST_n
* pulse width.
*
* To be on safe side, keep the reset low for at least 10us.
*/
usleep_range(10, 15);
ufs_mtk_device_reset_ctrl(1, res);
/* Some devices may need time to respond to rst_n */
usleep_range(10000, 15000);
dev_info(hba->dev, "device reset done\n");
return 0;
}
static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
{
int err;
err = ufshcd_hba_enable(hba);
if (err)
return err;
err = ufs_mtk_unipro_set_lpm(hba, false);
if (err)
return err;
err = ufshcd_uic_hibern8_exit(hba);
if (!err)
ufshcd_set_link_active(hba);
else
return err;
err = ufshcd_make_hba_operational(hba);
if (err)
return err;
return 0;
}
static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
{
int err;
/* Disable reset confirm feature by UniPro */
ufshcd_writel(hba,
(ufshcd_readl(hba, REG_UFS_XOUFS_CTRL) & ~0x100),
REG_UFS_XOUFS_CTRL);
err = ufs_mtk_unipro_set_lpm(hba, true);
if (err) {
/* Resume UniPro state for following error recovery */
ufs_mtk_unipro_set_lpm(hba, false);
return err;
}
return 0;
}
static void ufs_mtk_vccqx_set_lpm(struct ufs_hba *hba, bool lpm)
{
struct ufs_vreg *vccqx = NULL;
if (hba->vreg_info.vccq)
vccqx = hba->vreg_info.vccq;
else
vccqx = hba->vreg_info.vccq2;
regulator_set_mode(vccqx->reg,
lpm ? REGULATOR_MODE_IDLE : REGULATOR_MODE_NORMAL);
}
static void ufs_mtk_vsx_set_lpm(struct ufs_hba *hba, bool lpm)
{
struct arm_smccc_res res;
ufs_mtk_device_pwr_ctrl(!lpm,
(unsigned long)hba->dev_info.wspecversion,
res);
}
static void ufs_mtk_dev_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
{
if (!hba->vreg_info.vccq && !hba->vreg_info.vccq2)
return;
/* Skip if VCC is assumed always-on */
if (!hba->vreg_info.vcc)
return;
/* Bypass LPM when device is still active */
if (lpm && ufshcd_is_ufs_dev_active(hba))
return;
/* Bypass LPM if VCC is enabled */
if (lpm && hba->vreg_info.vcc->enabled)
return;
if (lpm) {
ufs_mtk_vccqx_set_lpm(hba, lpm);
ufs_mtk_vsx_set_lpm(hba, lpm);
} else {
ufs_mtk_vsx_set_lpm(hba, lpm);
ufs_mtk_vccqx_set_lpm(hba, lpm);
}
}
static void ufs_mtk_auto_hibern8_disable(struct ufs_hba *hba)
{
int ret;
/* disable auto-hibern8 */
ufshcd_writel(hba, 0, REG_AUTO_HIBERNATE_IDLE_TIMER);
/* wait host return to idle state when auto-hibern8 off */
ufs_mtk_wait_idle_state(hba, 5);
ret = ufs_mtk_wait_link_state(hba, VS_LINK_UP, 100);
if (ret)
dev_warn(hba->dev, "exit h8 state fail, ret=%d\n", ret);
}
static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
enum ufs_notify_change_status status)
{
int err;
struct arm_smccc_res res;
if (status == PRE_CHANGE) {
if (ufshcd_is_auto_hibern8_supported(hba))
ufs_mtk_auto_hibern8_disable(hba);
return 0;
}
if (ufshcd_is_link_hibern8(hba)) {
err = ufs_mtk_link_set_lpm(hba);
if (err)
goto fail;
}
if (!ufshcd_is_link_active(hba)) {
/*
* Make sure no error will be returned to prevent
* ufshcd_suspend() re-enabling regulators while vreg is still
* in low-power mode.
*/
err = ufs_mtk_mphy_power_on(hba, false);
if (err)
goto fail;
}
if (ufshcd_is_link_off(hba))
ufs_mtk_device_reset_ctrl(0, res);
ufs_mtk_host_pwr_ctrl(HOST_PWR_HCI, false, res);
return 0;
fail:
/*
* Set link as off state enforcedly to trigger
* ufshcd_host_reset_and_restore() in ufshcd_suspend()
* for completed host reset.
*/
ufshcd_set_link_off(hba);
return -EAGAIN;
}
static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
int err;
struct arm_smccc_res res;
if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL)
ufs_mtk_dev_vreg_set_lpm(hba, false);
ufs_mtk_host_pwr_ctrl(HOST_PWR_HCI, true, res);
err = ufs_mtk_mphy_power_on(hba, true);
if (err)
goto fail;
if (ufshcd_is_link_hibern8(hba)) {
err = ufs_mtk_link_set_hpm(hba);
if (err)
goto fail;
}
return 0;
fail:
return ufshcd_link_recovery(hba);
}
static void ufs_mtk_dbg_register_dump(struct ufs_hba *hba)
{
/* Dump ufshci register 0x140 ~ 0x14C */
ufshcd_dump_regs(hba, REG_UFS_XOUFS_CTRL, 0x10,
"XOUFS Ctrl (0x140): ");
ufshcd_dump_regs(hba, REG_UFS_EXTREG, 0x4, "Ext Reg ");
/* Dump ufshci register 0x2200 ~ 0x22AC */
ufshcd_dump_regs(hba, REG_UFS_MPHYCTRL,
REG_UFS_REJECT_MON - REG_UFS_MPHYCTRL + 4,
"MPHY Ctrl (0x2200): ");
/* Direct debugging information to REG_MTK_PROBE */
ufs_mtk_dbg_sel(hba);
ufshcd_dump_regs(hba, REG_UFS_PROBE, 0x4, "Debug Probe ");
}
static int ufs_mtk_apply_dev_quirks(struct ufs_hba *hba)
{
struct ufs_dev_info *dev_info = &hba->dev_info;
u16 mid = dev_info->wmanufacturerid;
if (mid == UFS_VENDOR_SAMSUNG) {
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE), 6);
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HIBERN8TIME), 10);
}
/*
* Decide waiting time before gating reference clock and
* after ungating reference clock according to vendors'
* requirements.
*/
if (mid == UFS_VENDOR_SAMSUNG)
ufs_mtk_setup_ref_clk_wait_us(hba, 1);
else if (mid == UFS_VENDOR_SKHYNIX)
ufs_mtk_setup_ref_clk_wait_us(hba, 30);
else if (mid == UFS_VENDOR_TOSHIBA)
ufs_mtk_setup_ref_clk_wait_us(hba, 100);
else
ufs_mtk_setup_ref_clk_wait_us(hba,
REFCLK_DEFAULT_WAIT_US);
return 0;
}
static void ufs_mtk_fixup_dev_quirks(struct ufs_hba *hba)
{
ufshcd_fixup_dev_quirks(hba, ufs_mtk_dev_fixups);
if (ufs_mtk_is_broken_vcc(hba) && hba->vreg_info.vcc &&
(hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_AFTER_LPM)) {
hba->vreg_info.vcc->always_on = true;
/*
* VCC will be kept always-on thus we don't
* need any delay during regulator operations
*/
hba->dev_quirks &= ~(UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
UFS_DEVICE_QUIRK_DELAY_AFTER_LPM);
}
ufs_mtk_vreg_fix_vcc(hba);
ufs_mtk_vreg_fix_vccqx(hba);
}
static void ufs_mtk_event_notify(struct ufs_hba *hba,
enum ufs_event_type evt, void *data)
{
unsigned int val = *(u32 *)data;
unsigned long reg;
u8 bit;
trace_ufs_mtk_event(evt, val);
/* Print details of UIC Errors */
if (evt <= UFS_EVT_DME_ERR) {
dev_info(hba->dev,
"Host UIC Error Code (%s): %08x\n",
ufs_uic_err_str[evt], val);
reg = val;
}
if (evt == UFS_EVT_PA_ERR) {
for_each_set_bit(bit, &reg, ARRAY_SIZE(ufs_uic_pa_err_str))
dev_info(hba->dev, "%s\n", ufs_uic_pa_err_str[bit]);
}
if (evt == UFS_EVT_DL_ERR) {
for_each_set_bit(bit, &reg, ARRAY_SIZE(ufs_uic_dl_err_str))
dev_info(hba->dev, "%s\n", ufs_uic_dl_err_str[bit]);
}
}
static void ufs_mtk_config_scaling_param(struct ufs_hba *hba,
struct devfreq_dev_profile *profile,
struct devfreq_simple_ondemand_data *data)
{
/* Customize min gear in clk scaling */
hba->clk_scaling.min_gear = UFS_HS_G4;
hba->vps->devfreq_profile.polling_ms = 200;
hba->vps->ondemand_data.upthreshold = 50;
hba->vps->ondemand_data.downdifferential = 20;
}
/**
* ufs_mtk_clk_scale - Internal clk scaling operation
*
* MTK platform supports clk scaling by switching parent of ufs_sel(mux).
* The ufs_sel downstream to ufs_ck which feeds directly to UFS hardware.
* Max and min clocks rate of ufs_sel defined in dts should match rate of
* "ufs_sel_max_src" and "ufs_sel_min_src" respectively.
* This prevent changing rate of pll clock that is shared between modules.
*
* @hba: per adapter instance
* @scale_up: True for scaling up and false for scaling down
*/
static void ufs_mtk_clk_scale(struct ufs_hba *hba, bool scale_up)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct ufs_mtk_clk *mclk = &host->mclk;
struct ufs_clk_info *clki = mclk->ufs_sel_clki;
int ret = 0;
ret = clk_prepare_enable(clki->clk);
if (ret) {
dev_info(hba->dev,
"clk_prepare_enable() fail, ret: %d\n", ret);
return;
}
if (scale_up) {
ret = clk_set_parent(clki->clk, mclk->ufs_sel_max_clki->clk);
clki->curr_freq = clki->max_freq;
} else {
ret = clk_set_parent(clki->clk, mclk->ufs_sel_min_clki->clk);
clki->curr_freq = clki->min_freq;
}
if (ret) {
dev_info(hba->dev,
"Failed to set ufs_sel_clki, ret: %d\n", ret);
}
clk_disable_unprepare(clki->clk);
trace_ufs_mtk_clk_scale(clki->name, scale_up, clk_get_rate(clki->clk));
}
static int ufs_mtk_clk_scale_notify(struct ufs_hba *hba, bool scale_up,
enum ufs_notify_change_status status)
{
if (!ufshcd_is_clkscaling_supported(hba))
return 0;
if (status == PRE_CHANGE) {
/* Switch parent before clk_set_rate() */
ufs_mtk_clk_scale(hba, scale_up);
} else {
/* Request interrupt latency QoS accordingly */
ufs_mtk_scale_perf(hba, scale_up);
}
return 0;
}
/*
* struct ufs_hba_mtk_vops - UFS MTK specific variant operations
*
* The variant operations configure the necessary controller and PHY
* handshake during initialization.
*/
static const struct ufs_hba_variant_ops ufs_hba_mtk_vops = {
.name = "mediatek.ufshci",
.init = ufs_mtk_init,
.get_ufs_hci_version = ufs_mtk_get_ufs_hci_version,
.setup_clocks = ufs_mtk_setup_clocks,
.hce_enable_notify = ufs_mtk_hce_enable_notify,
.link_startup_notify = ufs_mtk_link_startup_notify,
.pwr_change_notify = ufs_mtk_pwr_change_notify,
.apply_dev_quirks = ufs_mtk_apply_dev_quirks,
.fixup_dev_quirks = ufs_mtk_fixup_dev_quirks,
.suspend = ufs_mtk_suspend,
.resume = ufs_mtk_resume,
.dbg_register_dump = ufs_mtk_dbg_register_dump,
.device_reset = ufs_mtk_device_reset,
.event_notify = ufs_mtk_event_notify,
.config_scaling_param = ufs_mtk_config_scaling_param,
.clk_scale_notify = ufs_mtk_clk_scale_notify,
};
/**
* ufs_mtk_probe - probe routine of the driver
* @pdev: pointer to Platform device handle
*
* Return zero for success and non-zero for failure
*/
static int ufs_mtk_probe(struct platform_device *pdev)
{
int err;
struct device *dev = &pdev->dev;
struct device_node *reset_node;
struct platform_device *reset_pdev;
struct device_link *link;
reset_node = of_find_compatible_node(NULL, NULL,
"ti,syscon-reset");
if (!reset_node) {
dev_notice(dev, "find ti,syscon-reset fail\n");
goto skip_reset;
}
reset_pdev = of_find_device_by_node(reset_node);
if (!reset_pdev) {
dev_notice(dev, "find reset_pdev fail\n");
goto skip_reset;
}
link = device_link_add(dev, &reset_pdev->dev,
DL_FLAG_AUTOPROBE_CONSUMER);
put_device(&reset_pdev->dev);
if (!link) {
dev_notice(dev, "add reset device_link fail\n");
goto skip_reset;
}
/* supplier is not probed */
if (link->status == DL_STATE_DORMANT) {
err = -EPROBE_DEFER;
goto out;
}
skip_reset:
/* perform generic probe */
err = ufshcd_pltfrm_init(pdev, &ufs_hba_mtk_vops);
out:
if (err)
dev_info(dev, "probe failed %d\n", err);
of_node_put(reset_node);
return err;
}
/**
* ufs_mtk_remove - set driver_data of the device to NULL
* @pdev: pointer to platform device handle
*
* Always return 0
*/
static int ufs_mtk_remove(struct platform_device *pdev)
{
struct ufs_hba *hba = platform_get_drvdata(pdev);
pm_runtime_get_sync(&(pdev)->dev);
ufshcd_remove(hba);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int ufs_mtk_system_suspend(struct device *dev)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
int ret;
ret = ufshcd_system_suspend(dev);
if (ret)
return ret;
ufs_mtk_dev_vreg_set_lpm(hba, true);
return 0;
}
static int ufs_mtk_system_resume(struct device *dev)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
ufs_mtk_dev_vreg_set_lpm(hba, false);
return ufshcd_system_resume(dev);
}
#endif
#ifdef CONFIG_PM
static int ufs_mtk_runtime_suspend(struct device *dev)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
int ret = 0;
ret = ufshcd_runtime_suspend(dev);
if (ret)
return ret;
ufs_mtk_dev_vreg_set_lpm(hba, true);
return 0;
}
static int ufs_mtk_runtime_resume(struct device *dev)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
ufs_mtk_dev_vreg_set_lpm(hba, false);
return ufshcd_runtime_resume(dev);
}
#endif
static const struct dev_pm_ops ufs_mtk_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ufs_mtk_system_suspend,
ufs_mtk_system_resume)
SET_RUNTIME_PM_OPS(ufs_mtk_runtime_suspend,
ufs_mtk_runtime_resume, NULL)
.prepare = ufshcd_suspend_prepare,
.complete = ufshcd_resume_complete,
};
static struct platform_driver ufs_mtk_pltform = {
.probe = ufs_mtk_probe,
.remove = ufs_mtk_remove,
.shutdown = ufshcd_pltfrm_shutdown,
.driver = {
.name = "ufshcd-mtk",
.pm = &ufs_mtk_pm_ops,
.of_match_table = ufs_mtk_of_match,
},
};
MODULE_AUTHOR("Stanley Chu <stanley.chu@mediatek.com>");
MODULE_AUTHOR("Peter Wang <peter.wang@mediatek.com>");
MODULE_DESCRIPTION("MediaTek UFS Host Driver");
MODULE_LICENSE("GPL v2");
module_platform_driver(ufs_mtk_pltform);