[PATCH V5 11/26] mmc: sdhci-uhs2: add reset function and uhs2_mode function
From: Victor Shih
Date: Mon Oct 17 2022 - 05:15:36 EST
Sdhci_uhs2_reset() does a UHS-II specific reset operation.
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-pci-core.c | 1 +
drivers/mmc/host/sdhci-pci-gli.c | 1 +
drivers/mmc/host/sdhci-uhs2.c | 68 +++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci-uhs2.h | 3 ++
drivers/mmc/host/sdhci.c | 3 +-
drivers/mmc/host/sdhci.h | 14 +++++++
6 files changed, 89 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index 622b7de96c7f..a187379ad204 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -1926,6 +1926,7 @@ static const struct sdhci_ops sdhci_pci_ops = {
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
.hw_reset = sdhci_pci_hw_reset,
+ .uhs2_reset = sdhci_uhs2_reset,
};
/*****************************************************************************\
diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 4d509f656188..607cf69f45d0 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -1097,6 +1097,7 @@ static const struct sdhci_ops sdhci_gl9755_ops = {
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
.voltage_switch = sdhci_gli_voltage_switch,
+ .uhs2_reset = sdhci_uhs2_reset,
};
const struct sdhci_pci_fixes sdhci_gl9755 = {
diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 08905ed081fb..0e82f98d1967 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -10,6 +10,7 @@
* Author: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
*/
+#include <linux/delay.h>
#include <linux/module.h>
#include "sdhci.h"
@@ -49,6 +50,73 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host)
}
EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs);
+/*****************************************************************************\
+ * *
+ * Low level functions *
+ * *
+\*****************************************************************************/
+
+bool sdhci_uhs2_mode(struct sdhci_host *host)
+{
+ if ((host->mmc->caps2 & MMC_CAP2_SD_UHS2) &&
+ (IS_ENABLED(CONFIG_MMC_SDHCI_UHS2) &&
+ (host->version >= SDHCI_SPEC_400) &&
+ (host->mmc->flags & MMC_UHS2_SUPPORT)))
+ return true;
+ else
+ return false;
+}
+
+/**
+ * sdhci_uhs2_reset - invoke SW reset
+ * @host: SDHCI host
+ * @mask: Control mask
+ *
+ * Invoke SW reset, depending on a bit in @mask and wait for completion.
+ */
+void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask)
+{
+ unsigned long timeout;
+ u32 val;
+
+ if (!(sdhci_uhs2_mode(host))) {
+ /**
+ * u8 mask for legacy.
+ * u16 mask for uhs-2.
+ */
+ u8 u8_mask;
+
+ u8_mask = (mask & 0xFF);
+ sdhci_reset(host, u8_mask);
+
+ return;
+ }
+
+ sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET);
+
+ if (mask & SDHCI_UHS2_SW_RESET_FULL) {
+ host->clock = 0;
+ /* Reset-all turns off SD Bus Power */
+ if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
+ sdhci_runtime_pm_bus_off(host);
+ }
+
+ /* Wait max 100 ms */
+ timeout = 10000;
+
+ /* hw clears the bit when it's done */
+ if (read_poll_timeout_atomic(sdhci_readw, val, !(val & mask), 10,
+ timeout, true, host, SDHCI_UHS2_SW_RESET)) {
+ pr_err("%s: %s: Reset 0x%x never completed.\n",
+ __func__, mmc_hostname(host->mmc), (int)mask);
+ pr_err("%s: clean reset bit\n",
+ mmc_hostname(host->mmc));
+ sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET);
+ return;
+ }
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_reset);
+
/*****************************************************************************\
* *
* Driver init/exit *
diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
index afdb05d6056b..31776dcca5cf 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -11,6 +11,7 @@
#define __SDHCI_UHS2_H
#include <linux/bits.h>
+#include <linux/iopoll.h>
/*
* UHS-II Controller registers
@@ -210,5 +211,7 @@
struct sdhci_host;
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);
#endif /* __SDHCI_UHS2_H */
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 4434838475bf..ab7ea55d9864 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -194,13 +194,14 @@ static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
pm_runtime_get_noresume(mmc_dev(host->mmc));
}
-static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
+void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
{
if (!host->bus_on)
return;
host->bus_on = false;
pm_runtime_put_noidle(mmc_dev(host->mmc));
}
+EXPORT_SYMBOL_GPL(sdhci_runtime_pm_bus_off);
void sdhci_reset(struct sdhci_host *host, u8 mask)
{
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 64c2d7e78e29..3787ffe61c78 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -717,6 +717,19 @@ struct sdhci_ops {
u8 power_mode);
unsigned int (*get_ro)(struct sdhci_host *host);
void (*reset)(struct sdhci_host *host, u8 mask);
+ /**
+ * The sdhci_uhs2_reset callback is to implement for reset
+ * @host: SDHCI host
+ * @mask: Control mask
+ *
+ * Invoke reset, depending on a bit in @mask and wait for completion.
+ * SD mode UHS-II mode
+ * SDHCI_RESET_ALL SDHCI_UHS2_SW_RESET_FULL
+ * SDHCI_RESET_CMD SDHCI_RESET_CMD
+ * SDHCI_RESET_DATA SDHCI_UHS2_SW_RESET_SD
+ *
+ **/
+ void (*uhs2_reset)(struct sdhci_host *host, u16 mask);
int (*platform_execute_tuning)(struct sdhci_host *host, u32 opcode);
void (*set_uhs_signaling)(struct sdhci_host *host, unsigned int uhs);
void (*hw_reset)(struct sdhci_host *host);
@@ -839,6 +852,7 @@ static inline void sdhci_read_caps(struct sdhci_host *host)
__sdhci_read_caps(host, NULL, NULL, NULL);
}
+void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
unsigned int *actual_clock);
void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
--
2.25.1