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Date: Fri, 14 Oct 2022 19:45:53 +0800 From: Victor Shih <victorshihgli@...il.com> To: ulf.hansson@...aro.org, adrian.hunter@...el.com Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org, benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw, takahiro.akashi@...aro.org, dlunev@...omium.org, Victor Shih <victor.shih@...esyslogic.com.tw>, Ben Chuang <ben.chuang@...esyslogic.com.tw> Subject: [PATCH V5 18/26] mmc: sdhci-uhs2: add uhs2_control() to initialise the interface 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 <ben.chuang@...esyslogic.com.tw> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org> Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw> --- drivers/mmc/host/sdhci-uhs2.c | 115 ++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 3f3665d7990c..b0e6403ed31f 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -350,6 +350,65 @@ static void __sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) spin_unlock_irqrestore(&host->lock, flags); } +/* TODO: move this function to sdhci.c */ +static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set) +{ + u32 ier; + + ier = sdhci_readl(host, SDHCI_INT_ENABLE); + ier &= ~clear; + ier |= set; + sdhci_writel(host, ier, SDHCI_INT_ENABLE); + sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE); +} + +static void sdhci_uhs2_set_config(struct sdhci_host *host) +{ + u32 value; + u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SET_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 */ + sdhci_writel(host, host->mmc->uhs2_caps.n_lanes_set << + SDHCI_UHS2_GEN_SET_N_LANES_POS, sdhci_uhs2_gen_set_reg); + + /* Set PHY Settings */ + value = (host->mmc->uhs2_caps.n_lss_dir_set << + SDHCI_UHS2_PHY_SET_N_LSS_DIR_POS) | + (host->mmc->uhs2_caps.n_lss_sync_set << + SDHCI_UHS2_PHY_SET_N_LSS_SYN_POS); + if (host->mmc->flags & MMC_UHS2_SPEED_B) + value |= 1 << SDHCI_UHS2_PHY_SET_SPEED_POS; + sdhci_writel(host, value, sdhci_uhs2_phy_set_reg); + + /* Set LINK-TRAN Settings */ + value = (host->mmc->uhs2_caps.max_retry_set << + SDHCI_UHS2_TRAN_SET_RETRY_CNT_POS) | + (host->mmc->uhs2_caps.n_fcu_set << + SDHCI_UHS2_TRAN_SET_N_FCU_POS); + 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 * @@ -435,6 +494,61 @@ 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); + unsigned long flags; + int err = 0; + u16 sdhci_uhs2_set_ptr = sdhci_readw(host, SDHCI_UHS2_SET_PTR); + u16 sdhci_uhs2_phy_set_reg = (sdhci_uhs2_set_ptr + 4); + + DBG("Begin %s, act %d.\n", __func__, op); + + spin_lock_irqsave(&host->lock, flags); + + 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_clear_set_irqs(host, 0, SDHCI_INT_CARD_INT); + break; + case UHS2_DISABLE_INT: + sdhci_clear_set_irqs(host, SDHCI_INT_CARD_INT, 0); + break; + case UHS2_SET_SPEED_B: + sdhci_writeb(host, 1 << SDHCI_UHS2_PHY_SET_SPEED_POS, + sdhci_uhs2_phy_set_reg); + 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_POST_ATTACH_SD: + host->ops->uhs2_post_attach_sd(host); + break; + default: + pr_err("%s: input sd uhs2 operation %d is wrong!\n", + mmc_hostname(host->mmc), op); + err = -EIO; + break; + } + + spin_unlock_irqrestore(&host->lock, flags); + + return err; +} + /*****************************************************************************\ * * * Driver init/exit * @@ -593,6 +707,7 @@ 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_set_ios = sdhci_uhs2_set_ios; + host->mmc_host_ops.uhs2_control = sdhci_uhs2_control; if (!host->mmc_host_ops.uhs2_detect_init) host->mmc_host_ops.uhs2_detect_init = sdhci_uhs2_do_detect_init; -- 2.25.1
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