[PATCH V7 14/23] mmc: sdhci-uhs2: add set_ios()

From: Victor Shih
Date: Fri Mar 31 2023 - 06:58:13 EST

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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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-uhs2.c | 91 +++++++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci-uhs2.h | 1 +
drivers/mmc/host/sdhci.c | 53 ++++++++++++--------
drivers/mmc/host/sdhci.h | 2 +
4 files changed, 126 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index e2e9ce51b768..9b519bd6d76e 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -216,6 +216,67 @@ 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. Note, UHS2 timing is disabled when powering off */
+ ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if (ios->timing == MMC_TIMING_UHS2_SPEED_A)
+ 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);
+ host->timing = ios->timing;
+
+ 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);
+
+ sdhci_set_clock(host, host->clock);
+}
+
/*****************************************************************************\
* *
* MMC callbacks *
@@ -237,6 +298,36 @@ static int sdhci_uhs2_start_signal_voltage_switch(struct mmc_host *mmc,
return sdhci_start_signal_voltage_switch(mmc, ios);
}

+static int sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+
+ pr_debug("%s: clock %uHz powermode %u Vdd %u timing %u\n",
+ mmc_hostname(mmc), ios->clock, ios->power_mode, ios->vdd, ios->timing);
+
+ if (!sdhci_uhs2_mode(host)) {
+ sdhci_set_ios(mmc, ios);
+ return 0;
+ }
+
+ if (ios->power_mode == MMC_POWER_UNDEFINED)
+ return 0;
+
+ if (host->flags & SDHCI_DEVICE_DEAD) {
+ if (ios->power_mode == MMC_POWER_OFF) {
+ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
+ }
+ return -1;
+ }
+
+ sdhci_set_ios_common(mmc, ios);
+
+ __sdhci_uhs2_set_ios(mmc, ios);
+
+ return 0;
+}
+
/*****************************************************************************\
* *
* Driver init/exit *
diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
index fc03a178b676..33e03b1b2b80 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -181,5 +181,6 @@ 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 a68a2dce0efe..90d990a84d4f 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_UHS2_SPEED_A:
+ preset = sdhci_readw(host, SDHCI_PRESET_FOR_UHS2);
+ break;
default:
pr_warn("%s: Invalid UHS-I mode selected\n",
mmc_hostname(host->mmc));
@@ -2323,24 +2324,9 @@ 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.
@@ -2357,8 +2343,6 @@ 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;

@@ -2374,12 +2358,38 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
mmc->max_busy_timeout /= host->timeout_clk;
}
}
+}
+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 (host->ops->set_power)
host->ops->set_power(host, ios->power_mode, ios->vdd);
else
sdhci_set_power(host, ios->power_mode, ios->vdd);

+ 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);

@@ -2957,7 +2967,7 @@ 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)
@@ -2985,6 +2995,7 @@ 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 02ea4a00ad63..17d467172fe4 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -848,6 +848,8 @@ 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

Next message: Victor Shih: "[PATCH V7 15/23] mmc: sdhci-uhs2: add detect_init() to detect the interface"
Previous message: Victor Shih: "[PATCH V7 13/23] mmc: sdhci-uhs2: add set_timeout()"
In reply to: Victor Shih: "[PATCH V7 13/23] mmc: sdhci-uhs2: add set_timeout()"
Next in thread: Victor Shih: "[PATCH V7 15/23] mmc: sdhci-uhs2: add detect_init() to detect the interface"
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