linux-kernel - [PATCH V8 17/23] mmc: sdhci-uhs2: add uhs2

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Message-Id: <20230621100151.6329-18-victorshihgli@gmail.com>
Date:   Wed, 21 Jun 2023 18:01:45 +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 <victorshihgli@...il.com>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: [PATCH V8 17/23] mmc: sdhci-uhs2: add uhs2_control() to initialise the interface

From: Victor Shih <victor.shih@...esyslogic.com.tw>

This is a sdhci version of mmc's uhs2_set_reg operation.
UHS-II interface (related registers) will be initialised here.

Updates in V8:
 - Reorder the definitions and lose the parentheses in
   sdhci_uhs2_set_config().
 - read_poll_timeout() to instead of read_poll_timeout_atomic()
   in sdhci_uhs2_check_dormant().

Updates in V7:
 - Remove unnecessary function.

Updates in V6:
 - Remove unnecessary function.
 - Remove unnecessary parameter when call the DBG().
 - Cancel export state of some functions.

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 | 88 +++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index af1b0c5e48fd..09b86fec9f7b 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -278,6 +278,48 @@ 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;
+	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)
+{
+	int timeout = 100000; /* 100ms */
+	u32 val;
+
+	if (read_poll_timeout(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                                                             *
@@ -359,6 +401,51 @@ 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                                                          *
@@ -481,6 +568,7 @@ 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;
 }
-- 
2.25.1