Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Victor Shih <victorshihgli@gmail.com>
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 <victor.shih@genesyslogic.com.tw>,
        Ben Chuang <ben.chuang@genesyslogic.com.tw>
Subject: [PATCH V6 14/24] mmc: sdhci-uhs2: add set_ios()
Date:   Tue, 13 Dec 2022 17:00:37 +0800
Message-Id: <20221213090047.3805-15-victor.shih@genesyslogic.com.tw>
In-Reply-To: <20221213090047.3805-1-victor.shih@genesyslogic.com.tw>
References: <20221213090047.3805-1-victor.shih@genesyslogic.com.tw>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

This is a sdhci version of mmc's set_ios operation.
It covers both UHS-I and UHS-II.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw>
---
 drivers/mmc/host/sdhci-uhs2.c | 96 +++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-uhs2.h |  1 +
 drivers/mmc/host/sdhci.c      | 53 +++++++++++--------
 drivers/mmc/host/sdhci.h      |  2 +
 4 files changed, 131 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 00b1b69b49ea..3d52d35a91a5 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -213,6 +213,68 @@ void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
 }
 EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);
 
+/**
+ * sdhci_uhs2_clear_set_irqs - set Error Interrupt Status Enable register
+ * @host:	SDHCI host
+ * @clear:	bit-wise clear mask
+ * @set:	bit-wise set mask
+ *
+ * Set/unset bits in UHS-II Error Interrupt Status Enable register
+ */
+void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
+{
+	u32 ier;
+
+	ier = sdhci_readl(host, SDHCI_UHS2_INT_STATUS_ENABLE);
+	ier &= ~clear;
+	ier |= set;
+	sdhci_writel(host, ier, SDHCI_UHS2_INT_STATUS_ENABLE);
+	sdhci_writel(host, ier, SDHCI_UHS2_INT_SIGNAL_ENABLE);
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_clear_set_irqs);
+
+static void __sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	u8 cmd_res, dead_lock;
+	u16 ctrl_2;
+
+	/* UHS2 Timeout Control */
+	sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
+
+	/* change to use calculate value */
+	cmd_res |= FIELD_PREP(SDHCI_UHS2_TIMER_CTRL_DEADLOCK_MASK, dead_lock);
+
+	sdhci_uhs2_clear_set_irqs(host,
+				  SDHCI_UHS2_INT_CMD_TIMEOUT |
+				  SDHCI_UHS2_INT_DEADLOCK_TIMEOUT,
+				  0);
+	sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
+	sdhci_uhs2_clear_set_irqs(host, 0,
+				  SDHCI_UHS2_INT_CMD_TIMEOUT |
+				  SDHCI_UHS2_INT_DEADLOCK_TIMEOUT);
+
+	/* UHS2 timing */
+	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	if (ios->timing == MMC_TIMING_SD_UHS2)
+		ctrl_2 |= SDHCI_CTRL_UHS2 | SDHCI_CTRL_UHS2_ENABLE;
+	else
+		ctrl_2 &= ~(SDHCI_CTRL_UHS2 | SDHCI_CTRL_UHS2_ENABLE);
+	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+
+	if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
+		sdhci_enable_preset_value(host, true);
+
+	if (host->ops->set_power)
+		host->ops->set_power(host, ios->power_mode, ios->vdd);
+	else
+		sdhci_uhs2_set_power(host, ios->power_mode, ios->vdd);
+	udelay(100);
+
+	host->timing = ios->timing;
+	sdhci_set_clock(host, host->clock);
+}
+
 /*****************************************************************************\
  *                                                                           *
  * MMC callbacks                                                             *
@@ -234,6 +296,39 @@ static int sdhci_uhs2_start_signal_voltage_switch(struct mmc_host *mmc,
 	return sdhci_start_signal_voltage_switch(mmc, ios);
 }
 
+int sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+
+	if (!(host->version >= SDHCI_SPEC_400) ||
+	    !(host->mmc->flags & MMC_UHS2_SUPPORT &&
+	      host->mmc->caps2 & MMC_CAP2_SD_UHS2)) {
+		sdhci_set_ios(mmc, ios);
+		return 0;
+	}
+
+	if (ios->power_mode == MMC_POWER_UNDEFINED)
+		return 0;
+
+	if (host->flags & SDHCI_DEVICE_DEAD) {
+		if (!IS_ERR(mmc->supply.vmmc) &&
+		    ios->power_mode == MMC_POWER_OFF)
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+		if (!IS_ERR_OR_NULL(mmc->supply.vmmc2) &&
+		    ios->power_mode == MMC_POWER_OFF)
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
+		return -1;
+	}
+
+	host->timing = ios->timing;
+
+	sdhci_set_ios_common(mmc, ios);
+
+	__sdhci_uhs2_set_ios(mmc, ios);
+
+	return 0;
+}
+
 /*****************************************************************************\
  *                                                                           *
  * Driver init/exit                                                          *
@@ -244,6 +339,7 @@ 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;
 
 	return 0;
 }
diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
index a58ef19c08aa..184fee80253c 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -178,5 +178,6 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host);
 bool sdhci_uhs2_mode(struct sdhci_host *host);
 void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
 void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
+void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set);
 
 #endif /* __SDHCI_UHS2_H */
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 99633a3ef549..49bbdc155b2b 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -47,8 +47,6 @@
 static unsigned int debug_quirks = 0;
 static unsigned int debug_quirks2;
 
-static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
-
 static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd);
 
 void sdhci_dumpregs(struct sdhci_host *host)
@@ -1877,6 +1875,9 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
 	case MMC_TIMING_MMC_HS400:
 		preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
 		break;
+	case MMC_TIMING_SD_UHS2:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_UHS2);
+		break;
 	default:
 		pr_warn("%s: Invalid UHS-I mode selected\n",
 			mmc_hostname(host->mmc));
@@ -2325,24 +2326,9 @@ static bool sdhci_presetable_values_change(struct sdhci_host *host, struct mmc_i
 	       (sdhci_preset_needed(host, ios->timing) || host->drv_type != ios->drv_type);
 }
 
-void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+void sdhci_set_ios_common(struct mmc_host *mmc, struct mmc_ios *ios)
 {
 	struct sdhci_host *host = mmc_priv(mmc);
-	bool reinit_uhs = host->reinit_uhs;
-	bool turning_on_clk = false;
-	u8 ctrl;
-
-	host->reinit_uhs = false;
-
-	if (ios->power_mode == MMC_POWER_UNDEFINED)
-		return;
-
-	if (host->flags & SDHCI_DEVICE_DEAD) {
-		if (!IS_ERR(mmc->supply.vmmc) &&
-		    ios->power_mode == MMC_POWER_OFF)
-			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
-		return;
-	}
 
 	/*
 	 * Reset the chip on each power off.
@@ -2359,8 +2345,6 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		sdhci_enable_preset_value(host, false);
 
 	if (!ios->clock || ios->clock != host->clock) {
-		turning_on_clk = ios->clock && !host->clock;
-
 		host->ops->set_clock(host, ios->clock);
 		host->clock = ios->clock;
 
@@ -2381,6 +2365,32 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 		host->ops->set_power(host, ios->power_mode, ios->vdd);
 	else
 		sdhci_set_power(host, ios->power_mode, ios->vdd);
+}
+EXPORT_SYMBOL_GPL(sdhci_set_ios_common);
+
+void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	bool reinit_uhs = host->reinit_uhs;
+	bool turning_on_clk = false;
+	u8 ctrl;
+
+	host->reinit_uhs = false;
+
+	if (ios->power_mode == MMC_POWER_UNDEFINED)
+		return;
+
+	if (host->flags & SDHCI_DEVICE_DEAD) {
+		if (!IS_ERR(mmc->supply.vmmc) &&
+		    ios->power_mode == MMC_POWER_OFF)
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+		return;
+	}
+
+	sdhci_set_ios_common(mmc, ios);
+
+	if (!ios->clock || ios->clock != host->clock)
+		turning_on_clk = ios->clock && !host->clock;
 
 	if (host->ops->platform_send_init_74_clocks)
 		host->ops->platform_send_init_74_clocks(host, ios->power_mode);
@@ -2959,7 +2969,7 @@ int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
 }
 EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
 
-static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
+void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
 {
 	/* Host Controller v3.00 defines preset value registers */
 	if (host->version < SDHCI_SPEC_300)
@@ -2987,6 +2997,7 @@ static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
 		host->preset_enabled = enable;
 	}
 }
+EXPORT_SYMBOL_GPL(sdhci_enable_preset_value);
 
 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
 				int err)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index df7fa0c0ebf8..c2f989dc2361 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -850,6 +850,8 @@ void sdhci_set_bus_width(struct sdhci_host *host, int width);
 void sdhci_reset(struct sdhci_host *host, u8 mask);
 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
+void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
+void sdhci_set_ios_common(struct mmc_host *mmc, struct mmc_ios *ios);
 void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
 int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
 				      struct mmc_ios *ios);
-- 
2.25.1