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[2001:b400:e25c:983f:c7ff:3efd:77d9:6c16]) by smtp.gmail.com with ESMTPSA id f19-20020a170902e99300b0019acd3151d0sm1287665plb.114.2023.03.31.03.56.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Mar 2023 03:56:50 -0700 (PDT) From: Victor Shih X-Google-Original-From: Victor Shih To: ulf.hansson@linaro.org, adrian.hunter@intel.com Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, benchuanggli@gmail.com, HL.Liu@genesyslogic.com.tw, Greg.tu@genesyslogic.com.tw, takahiro.akashi@linaro.org, dlunev@chromium.org, Victor Shih , Ben Chuang Subject: [PATCH V7 17/23] mmc: sdhci-uhs2: add uhs2_control() to initialise the interface Date: Fri, 31 Mar 2023 18:55:40 +0800 Message-Id: <20230331105546.13607-18-victor.shih@genesyslogic.com.tw> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230331105546.13607-1-victor.shih@genesyslogic.com.tw> References: <20230331105546.13607-1-victor.shih@genesyslogic.com.tw> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org This is a sdhci version of mmc's uhs2_set_reg operation. UHS-II interface (related registers) will be initialised here. Signed-off-by: Ben Chuang Signed-off-by: AKASHI Takahiro Signed-off-by: Victor Shih --- drivers/mmc/host/sdhci-uhs2.c | 89 +++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 71ac76065886..6fe394b1a7be 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -278,6 +278,49 @@ static void __sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) sdhci_set_clock(host, host->clock); } +static void sdhci_uhs2_set_config(struct sdhci_host *host) +{ + u32 value; + u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SETTINGS_PTR); + u16 sdhci_uhs2_gen_set_reg = (sdhci_uhs2_set_ptr + 0); + u16 sdhci_uhs2_phy_set_reg = (sdhci_uhs2_set_ptr + 4); + u16 sdhci_uhs2_tran_set_reg = (sdhci_uhs2_set_ptr + 8); + u16 sdhci_uhs2_tran_set_1_reg = (sdhci_uhs2_set_ptr + 12); + + /* Set Gen Settings */ + value = FIELD_PREP(SDHCI_UHS2_GEN_SETTINGS_N_LANES_MASK, host->mmc->uhs2_caps.n_lanes_set); + sdhci_writel(host, value, sdhci_uhs2_gen_set_reg); + + /* Set PHY Settings */ + value = FIELD_PREP(SDHCI_UHS2_PHY_N_LSS_DIR_MASK, host->mmc->uhs2_caps.n_lss_dir_set) | + FIELD_PREP(SDHCI_UHS2_PHY_N_LSS_SYN_MASK, host->mmc->uhs2_caps.n_lss_sync_set); + if (host->mmc->ios.timing == MMC_TIMING_UHS2_SPEED_B || + host->mmc->ios.timing == MMC_TIMING_UHS2_SPEED_B_HD) + value |= SDHCI_UHS2_PHY_SET_SPEED_B; + sdhci_writel(host, value, sdhci_uhs2_phy_set_reg); + + /* Set LINK-TRAN Settings */ + value = FIELD_PREP(SDHCI_UHS2_TRAN_RETRY_CNT_MASK, host->mmc->uhs2_caps.max_retry_set) | + FIELD_PREP(SDHCI_UHS2_TRAN_N_FCU_MASK, host->mmc->uhs2_caps.n_fcu_set); + sdhci_writel(host, value, sdhci_uhs2_tran_set_reg); + sdhci_writel(host, host->mmc->uhs2_caps.n_data_gap_set, sdhci_uhs2_tran_set_1_reg); +} + +static int sdhci_uhs2_check_dormant(struct sdhci_host *host) +{ + u32 val; + /* 100ms */ + int timeout = 100000; + + if (read_poll_timeout_atomic(sdhci_readl, val, (val & SDHCI_UHS2_IN_DORMANT_STATE), + 100, timeout, true, host, SDHCI_PRESENT_STATE)) { + pr_warn("%s: UHS2 IN_DORMANT fail in 100ms.\n", mmc_hostname(host->mmc)); + sdhci_dumpregs(host); + return -EIO; + } + return 0; +} + /*****************************************************************************\ * * * MMC callbacks * @@ -360,6 +403,51 @@ static int sdhci_uhs2_enable_clk(struct mmc_host *mmc) return 0; } +static int sdhci_uhs2_do_detect_init(struct mmc_host *mmc); + +static int sdhci_uhs2_control(struct mmc_host *mmc, enum sd_uhs2_operation op) +{ + struct sdhci_host *host = mmc_priv(mmc); + struct mmc_ios *ios = &mmc->ios; + int err = 0; + + DBG("Begin uhs2 control, act %d.\n", op); + + switch (op) { + case UHS2_PHY_INIT: + err = sdhci_uhs2_do_detect_init(mmc); + break; + case UHS2_SET_CONFIG: + sdhci_uhs2_set_config(host); + break; + case UHS2_ENABLE_INT: + sdhci_uhs2_clear_set_irqs(host, 0, SDHCI_INT_CARD_INT); + break; + case UHS2_DISABLE_INT: + sdhci_uhs2_clear_set_irqs(host, SDHCI_INT_CARD_INT, 0); + break; + case UHS2_CHECK_DORMANT: + err = sdhci_uhs2_check_dormant(host); + break; + case UHS2_DISABLE_CLK: + err = sdhci_uhs2_disable_clk(mmc); + break; + case UHS2_ENABLE_CLK: + err = sdhci_uhs2_enable_clk(mmc); + break; + case UHS2_SET_IOS: + err = sdhci_uhs2_set_ios(mmc, ios); + break; + default: + pr_err("%s: input sd uhs2 operation %d is wrong!\n", + mmc_hostname(host->mmc), op); + err = -EIO; + break; + } + + return err; +} + /*****************************************************************************\ * * * Driver init/exit * @@ -487,6 +575,7 @@ static int sdhci_uhs2_host_ops_init(struct sdhci_host *host) { host->mmc_host_ops.start_signal_voltage_switch = sdhci_uhs2_start_signal_voltage_switch; + host->mmc_host_ops.uhs2_control = sdhci_uhs2_control; return 0; }