// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2019 MediaTek Inc. * Authors: * Stanley Chu * Peter Wang */ #include #include #include #include #include #include #include #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) #define ufs_mtk_unipro_powerdown(hba, powerdown) \ ufshcd_dme_set(hba, \ UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0), \ powerdown) 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_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; 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; unsigned long timeout; 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 = jiffies + msecs_to_jiffies(REFCLK_REQ_TIMEOUT_MS); do { 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 (time_before(jiffies, 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 u32 ufs_mtk_link_get_state(struct ufs_hba *hba) { u32 val; ufshcd_writel(hba, 0x20, REG_UFS_DEBUG_SEL); val = ufshcd_readl(hba, REG_UFS_PROBE); val = val >> 28; return val; } /** * 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; /* * 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_active(hba)) { ufs_mtk_setup_ref_clk(hba, on); ret = phy_power_off(host->mphy); } else { /* * Gate ref-clk if link state is in Hibern8 * triggered by Auto-Hibern8. */ if (!ufshcd_can_hibern8_during_gating(hba) && ufshcd_is_auto_hibern8_enabled(hba) && ufs_mtk_link_get_state(hba) == VS_LINK_HIBERN8) ufs_mtk_setup_ref_clk(hba, on); } } else if (on && status == POST_CHANGE) { ret = phy_power_on(host->mphy); 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; /* * 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_pre_link(struct ufs_hba *hba) { int ret; u32 tmp; ufs_mtk_unipro_powerdown(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_powerdown(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_powerdown(hba, 1); if (err) { /* Resume UniPro state for following error recovery */ ufs_mtk_unipro_powerdown(hba, 0); return err; } return 0; } static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) { int err; struct ufs_mtk_host *host = ufshcd_get_variant(hba); if (ufshcd_is_link_hibern8(hba)) { err = ufs_mtk_link_set_lpm(hba); if (err) return -EAGAIN; } if (!ufshcd_is_link_active(hba)) phy_power_off(host->mphy); return 0; } static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) { struct ufs_mtk_host *host = ufshcd_get_variant(hba); int err; if (!ufshcd_is_link_active(hba)) phy_power_on(host->mphy); if (ufshcd_is_link_hibern8(hba)) { err = ufs_mtk_link_set_hpm(hba); if (err) 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) { hba->dev_quirks &= ~UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE; 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; } /** * 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, .link_startup_notify = ufs_mtk_link_startup_notify, .pwr_change_notify = ufs_mtk_pwr_change_notify, .apply_dev_quirks = ufs_mtk_apply_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 "); MODULE_AUTHOR("Peter Wang "); MODULE_DESCRIPTION("MediaTek UFS Host Driver"); MODULE_LICENSE("GPL v2"); module_platform_driver(ufs_mtk_pltform);