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Date:   Thu, 22 Jul 2021 12:01:11 +0800
From:   Jason Lai <jasonlai.genesyslogic@...il.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ben.chuang@...esyslogic.com.tw, greg.tu@...esyslogic.com.tw,
        jason.lai@...esyslogiv.com.tw,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [RFC PATCH v3.2 16/29] mmc: sdhci-uhs2: add set_ios()

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@...esyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
---
 drivers/mmc/host/sdhci-uhs2.c | 100 ++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-uhs2.h |   1 +
 drivers/mmc/host/sdhci.c      |  40 +++++++++-----
 drivers/mmc/host/sdhci.h      |   2 +
 4 files changed, 128 insertions(+), 15 deletions(-)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index d9e98c097bfe..637464748cc4 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -263,6 +263,74 @@ 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_ERR_INT_STATUS_EN);
+	ier &= ~clear;
+	ier |= set;
+	sdhci_writel(host, ier, SDHCI_UHS2_ERR_INT_STATUS_EN);
+	sdhci_writel(host, ier, SDHCI_UHS2_ERR_INT_SIG_EN);
+}
+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;
+	unsigned long flags;
+
+	/* FIXME: why lock? */
+	spin_lock_irqsave(&host->lock, flags);
+
+	/* UHS2 Timeout Control */
+	sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
+
+	/* change to use calculate value */
+	cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT;
+
+	sdhci_uhs2_clear_set_irqs(host,
+				  SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT |
+				  SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT,
+				  0);
+	sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
+	sdhci_uhs2_clear_set_irqs(host, 0,
+				  SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT |
+				  SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT);
+
+	/* UHS2 timing */
+	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	if (ios->timing == MMC_TIMING_UHS2)
+		ctrl_2 |= SDHCI_CTRL_UHS_2 | SDHCI_CTRL_UHS2_INTERFACE_EN;
+	else
+		ctrl_2 &= ~(SDHCI_CTRL_UHS_2 | SDHCI_CTRL_UHS2_INTERFACE_EN);
+	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_set_power(host, ios->power_mode, ios->vdd);
+	udelay(100);
+
+	host->timing = ios->timing;
+	sdhci_set_clock(host, host->clock);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
 /*****************************************************************************\
  *                                                                           *
  * MMC callbacks                                                             *
@@ -286,6 +354,37 @@ static int sdhci_uhs2_start_signal_voltage_switch(struct mmc_host *mmc,
 	return sdhci_start_signal_voltage_switch(mmc, ios);
 }

+void 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->caps & MMC_CAP_UHS2)) {
+		sdhci_set_ios(mmc, ios);
+		return;
+	}
+
+	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);
+		if (!IS_ERR_OR_NULL(mmc->supply.vmmc2) &&
+		    ios->power_mode == MMC_POWER_OFF)
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
+		return;
+	}
+
+	/* FIXME: host->timing = ios->timing */
+
+	sdhci_set_ios_common(mmc, ios);
+
+	__sdhci_uhs2_set_ios(mmc, ios);
+}
+
 /*****************************************************************************\
  *                                                                           *
  * Driver init/exit                                                          *
@@ -296,6 +395,7 @@ 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.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 efe70577bc74..c1ff4ac1ab7a 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -214,5 +214,6 @@ void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
 void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
 			  unsigned short vdd);
 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 d944e5e0a30a..d60a1fdd1385 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)
@@ -1837,6 +1835,9 @@ 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_UHS2:
+		preset = sdhci_readw(host, SDHCI_PRESET_FOR_UHS2);
+		break;
 	default:
 		pr_warn("%s: Invalid UHS-I mode selected\n",
 			mmc_hostname(host->mmc));
@@ -2250,20 +2251,9 @@ void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
 }
 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);

-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);
-	u8 ctrl;
-
-	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.
@@ -2300,6 +2290,25 @@ 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);
+	u8 ctrl;
+
+	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 (host->ops->platform_send_init_74_clocks)
 		host->ops->platform_send_init_74_clocks(host, ios->power_mode);
@@ -2870,7 +2879,7 @@ 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)
@@ -2898,6 +2907,7 @@ 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 2b5b8295cf92..e84ebddb20d8 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -851,6 +851,8 @@ 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);
--
2.32.0

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