linux/drivers/scsi/ufs/ufs-mediatek.c
Stanley Chu 9a3cd470f8 scsi: ufs-mediatek: Make ufs_mtk_wait_link_state static
Fix build warning reported by kernel test robot:

Warning:
>> drivers/scsi/ufs/ufs-mediatek.c:181:5: warning: no previous prototype
>> for 'ufs_mtk_wait_link_state' [-Wmissing-prototypes]

Link: https://lore.kernel.org/r/20200616095120.14570-1-stanley.chu@mediatek.com
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-06-19 22:53:35 -04:00

742 lines
17 KiB
C

// 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/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/soc/mediatek/mtk_sip_svc.h>
#include "ufshcd.h"
#include "ufshcd-pltfrm.h"
#include "ufs_quirks.h"
#include "unipro.h"
#include "ufs-mediatek.h"
#define ufs_mtk_smc(cmd, val, res) \
arm_smccc_smc(MTK_SIP_UFS_CONTROL, \
cmd, val, 0, 0, 0, 0, 0, &(res))
#define ufs_mtk_ref_clk_notify(on, res) \
ufs_mtk_smc(UFS_MTK_SIP_REF_CLK_NOTIFICATION, on, res)
#define ufs_mtk_device_reset_ctrl(high, res) \
ufs_mtk_smc(UFS_MTK_SIP_DEVICE_RESET, high, res)
static struct ufs_dev_fix ufs_mtk_dev_fixups[] = {
UFS_FIX(UFS_VENDOR_SKHYNIX, "H9HQ21AFAMZDAR",
UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES),
END_FIX
};
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 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;
}
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);
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;
if (on) {
ufs_mtk_ref_clk_notify(on, res);
ufshcd_delay_us(host->ref_clk_ungating_wait_us, 10);
ufshcd_writel(hba, REFCLK_REQUEST, REG_UFS_REFCLK_CTRL);
} else {
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, res);
return -ETIMEDOUT;
out:
host->ref_clk_enabled = on;
if (!on) {
ufshcd_delay_us(host->ref_clk_gating_wait_us, 10);
ufs_mtk_ref_clk_notify(on, res);
}
return 0;
}
static void ufs_mtk_setup_ref_clk_wait_us(struct ufs_hba *hba,
u16 gating_us, u16 ungating_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 = ungating_us;
}
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_us(ktime_get(), ms_to_ktime(max_wait_ms));
do {
time_checked = ktime_get();
ufshcd_writel(hba, 0x20, REG_UFS_DEBUG_SEL);
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 void 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;
if (!mphy)
return;
if (on && !host->mphy_powered_on)
phy_power_on(mphy);
else if (!on && host->mphy_powered_on)
phy_power_off(mphy);
else
return;
host->mphy_powered_on = on;
}
/**
* 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);
int ret = 0;
bool clk_pwr_off = false;
/*
* 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_setup_ref_clk(hba, on);
ufs_mtk_mphy_power_on(hba, on);
}
} else if (on && status == POST_CHANGE) {
ufs_mtk_mphy_power_on(hba, on);
ufs_mtk_setup_ref_clk(hba, on);
}
return ret;
}
/**
* 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)
{
struct ufs_mtk_host *host;
struct device *dev = hba->dev;
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);
err = ufs_mtk_bind_mphy(hba);
if (err)
goto out_variant_clear;
/* Enable runtime autosuspend */
hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
/* Enable clock-gating */
hba->caps |= UFSHCD_CAP_CLK_GATING;
/* Enable WriteBooster */
hba->caps |= UFSHCD_CAP_WB_EN;
hba->vps->wb_flush_threshold = UFS_WB_BUF_REMAIN_PERCENT(80);
/*
* 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_setup_clocks(hba, true, POST_CHANGE);
goto out;
out_variant_clear:
ufshcd_set_variant(hba, NULL);
out:
return err;
}
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_dev_params host_cap;
int ret;
host_cap.tx_lanes = UFS_MTK_LIMIT_NUM_LANES_TX;
host_cap.rx_lanes = UFS_MTK_LIMIT_NUM_LANES_RX;
host_cap.hs_rx_gear = UFS_MTK_LIMIT_HSGEAR_RX;
host_cap.hs_tx_gear = UFS_MTK_LIMIT_HSGEAR_TX;
host_cap.pwm_rx_gear = UFS_MTK_LIMIT_PWMGEAR_RX;
host_cap.pwm_tx_gear = UFS_MTK_LIMIT_PWMGEAR_TX;
host_cap.rx_pwr_pwm = UFS_MTK_LIMIT_RX_PWR_PWM;
host_cap.tx_pwr_pwm = UFS_MTK_LIMIT_TX_PWR_PWM;
host_cap.rx_pwr_hs = UFS_MTK_LIMIT_RX_PWR_HS;
host_cap.tx_pwr_hs = UFS_MTK_LIMIT_TX_PWR_HS;
host_cap.hs_rate = UFS_MTK_LIMIT_HS_RATE;
host_cap.desired_working_mode =
UFS_MTK_LIMIT_DESIRED_MODE;
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__);
}
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_pm(struct ufs_hba *hba, u32 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);
if (!ret)
host->unipro_lpm = lpm;
return ret;
}
static int ufs_mtk_pre_link(struct ufs_hba *hba)
{
int ret;
u32 tmp;
ufs_mtk_unipro_set_pm(hba, 0);
/*
* 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)
{
unsigned long flags;
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;
spin_lock_irqsave(hba->host->host_lock, flags);
hba->clk_gating.delay_ms = ah_ms + 5;
spin_unlock_irqrestore(hba->host->host_lock, flags);
}
}
static int ufs_mtk_post_link(struct ufs_hba *hba)
{
/* enable unipro clock gating feature */
ufs_mtk_cfg_unipro_cg(hba, true);
/* configure auto-hibern8 timer to 10ms */
if (ufshcd_is_auto_hibern8_supported(hba)) {
ufshcd_auto_hibern8_update(hba,
FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 10) |
FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3));
}
ufs_mtk_setup_clk_gating(hba);
return 0;
}
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:
ret = ufs_mtk_post_link(hba);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static void ufs_mtk_device_reset(struct ufs_hba *hba)
{
struct arm_smccc_res res;
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");
}
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_pm(hba, 0);
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;
err = ufs_mtk_unipro_set_pm(hba, 1);
if (err) {
/* Resume UniPro state for following error recovery */
ufs_mtk_unipro_set_pm(hba, 0);
return err;
}
return 0;
}
static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
{
if (!hba->vreg_info.vccq2)
return;
if (lpm & !hba->vreg_info.vcc->enabled)
regulator_set_mode(hba->vreg_info.vccq2->reg,
REGULATOR_MODE_IDLE);
else if (!lpm)
regulator_set_mode(hba->vreg_info.vccq2->reg,
REGULATOR_MODE_NORMAL);
}
static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
int err;
if (ufshcd_is_link_hibern8(hba)) {
err = ufs_mtk_link_set_lpm(hba);
if (err) {
/*
* 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;
}
/*
* Make sure no error will be returned to prevent
* ufshcd_suspend() re-enabling regulators while vreg is still
* in low-power mode.
*/
ufs_mtk_vreg_set_lpm(hba, true);
}
return 0;
}
static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
int err;
if (ufshcd_is_link_hibern8(hba)) {
ufs_mtk_vreg_set_lpm(hba, false);
err = ufs_mtk_link_set_hpm(hba);
if (err) {
err = ufshcd_link_recovery(hba);
return err;
}
}
return 0;
}
static void ufs_mtk_dbg_register_dump(struct ufs_hba *hba)
{
ufshcd_dump_regs(hba, REG_UFS_REFCLK_CTRL, 0x4, "Ref-Clk Ctrl ");
ufshcd_dump_regs(hba, REG_UFS_EXTREG, 0x4, "Ext Reg ");
ufshcd_dump_regs(hba, REG_UFS_MPHYCTRL,
REG_UFS_REJECT_MON - REG_UFS_MPHYCTRL + 4,
"MPHY Ctrl ");
/* Direct debugging information to REG_MTK_PROBE */
ufshcd_writel(hba, 0x20, REG_UFS_DEBUG_SEL);
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);
/*
* 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, 1);
else if (mid == UFS_VENDOR_SKHYNIX)
ufs_mtk_setup_ref_clk_wait_us(hba, 30, 30);
else if (mid == UFS_VENDOR_TOSHIBA)
ufs_mtk_setup_ref_clk_wait_us(hba, 100, 32);
return 0;
}
static void ufs_mtk_fixup_dev_quirks(struct ufs_hba *hba)
{
struct ufs_dev_info *dev_info = &hba->dev_info;
u16 mid = dev_info->wmanufacturerid;
ufshcd_fixup_dev_quirks(hba, ufs_mtk_dev_fixups);
if (mid == UFS_VENDOR_SAMSUNG)
hba->dev_quirks &= ~UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE;
}
/**
* struct ufs_hba_mtk_vops - UFS MTK specific variant operations
*
* The variant operations configure the necessary controller and PHY
* handshake during initialization.
*/
static struct ufs_hba_variant_ops ufs_hba_mtk_vops = {
.name = "mediatek.ufshci",
.init = ufs_mtk_init,
.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,
};
/**
* 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;
/* perform generic probe */
err = ufshcd_pltfrm_init(pdev, &ufs_hba_mtk_vops);
if (err)
dev_info(dev, "probe failed %d\n", err);
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;
}
static const struct of_device_id ufs_mtk_of_match[] = {
{ .compatible = "mediatek,mt8183-ufshci"},
{},
};
static const struct dev_pm_ops ufs_mtk_pm_ops = {
.suspend = ufshcd_pltfrm_suspend,
.resume = ufshcd_pltfrm_resume,
.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
.runtime_resume = ufshcd_pltfrm_runtime_resume,
.runtime_idle = ufshcd_pltfrm_runtime_idle,
};
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);