| Message ID | 1532340508-8749-2-git-send-email-zhang.chunyan@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | mmc: add support for sdhci 4.0 | expand |
On 23/07/18 13:08, Chunyan Zhang wrote: > For SD host controller version 4.00 or later ones, there're two > modes of implementation - Version 3.00 compatible mode or > Version 4 mode. This patch introduced an interface to enable > v4 mode. > > Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> > --- > drivers/mmc/host/sdhci.c | 28 ++++++++++++++++++++++++++++ > drivers/mmc/host/sdhci.h | 5 +++++ > 2 files changed, 33 insertions(+) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index 1c828e0..cab5350 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -123,6 +123,30 @@ EXPORT_SYMBOL_GPL(sdhci_dumpregs); > * * > \*****************************************************************************/ > > +static void sdhci_do_enable_v4_mode(struct sdhci_host *host) > +{ > + u16 ctrl2; > + > + ctrl2 = sdhci_readb(host, SDHCI_HOST_CONTROL2); > + if (ctrl2 & SDHCI_CTRL_V4_MODE) > + return; > + > + ctrl2 |= SDHCI_CTRL_V4_MODE; > + sdhci_writeb(host, ctrl2, SDHCI_HOST_CONTROL); > +} > + > +/* > + * Vendor's Host Controller which supports v4 mode can call > + * this function to enable v4 mode before calling > + * __sdhci_add_host(). > + */ > +void sdhci_enable_v4_mode(struct sdhci_host *host) > +{ > + host->v4_mode = true; > + sdhci_do_enable_v4_mode(host); > +} > +EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode); > + > static inline bool sdhci_data_line_cmd(struct mmc_command *cmd) > { > return cmd->data || cmd->flags & MMC_RSP_BUSY; > @@ -224,6 +248,10 @@ static void sdhci_do_reset(struct sdhci_host *host, u8 mask) > > /* Resetting the controller clears many */ > host->preset_enabled = false; > + > + if (host->v4_mode) > + sdhci_do_enable_v4_mode(host); Instead of sdhci_do_reset() I would rather add this to sdhci_init() and __sdhci_read_caps() > + > } > } > > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h > index 23966f8..519d939 100644 > --- a/drivers/mmc/host/sdhci.h > +++ b/drivers/mmc/host/sdhci.h > @@ -184,6 +184,7 @@ > #define SDHCI_CTRL_DRV_TYPE_D 0x0030 > #define SDHCI_CTRL_EXEC_TUNING 0x0040 > #define SDHCI_CTRL_TUNED_CLK 0x0080 > +#define SDHCI_CTRL_V4_MODE 0x1000 > #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000 > > #define SDHCI_CAPABILITIES 0x40 > @@ -565,6 +566,9 @@ struct sdhci_host { > > u64 data_timeout; > > + /* Host Version 4 Enable */ > + bool v4_mode; Let's put this with the other bools i.e. after bool irq_wake_enabled; > + > unsigned long private[0] ____cacheline_aligned; > }; > > @@ -747,5 +751,6 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error, > int *data_error); > > void sdhci_dumpregs(struct sdhci_host *host); > +void sdhci_enable_v4_mode(struct sdhci_host *host); > > #endif /* __SDHCI_HW_H */ > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 1c828e0..cab5350 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -123,6 +123,30 @@ EXPORT_SYMBOL_GPL(sdhci_dumpregs); * * \*****************************************************************************/ +static void sdhci_do_enable_v4_mode(struct sdhci_host *host) +{ + u16 ctrl2; + + ctrl2 = sdhci_readb(host, SDHCI_HOST_CONTROL2); + if (ctrl2 & SDHCI_CTRL_V4_MODE) + return; + + ctrl2 |= SDHCI_CTRL_V4_MODE; + sdhci_writeb(host, ctrl2, SDHCI_HOST_CONTROL); +} + +/* + * Vendor's Host Controller which supports v4 mode can call + * this function to enable v4 mode before calling + * __sdhci_add_host(). + */ +void sdhci_enable_v4_mode(struct sdhci_host *host) +{ + host->v4_mode = true; + sdhci_do_enable_v4_mode(host); +} +EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode); + static inline bool sdhci_data_line_cmd(struct mmc_command *cmd) { return cmd->data || cmd->flags & MMC_RSP_BUSY; @@ -224,6 +248,10 @@ static void sdhci_do_reset(struct sdhci_host *host, u8 mask) /* Resetting the controller clears many */ host->preset_enabled = false; + + if (host->v4_mode) + sdhci_do_enable_v4_mode(host); + } } diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 23966f8..519d939 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -184,6 +184,7 @@ #define SDHCI_CTRL_DRV_TYPE_D 0x0030 #define SDHCI_CTRL_EXEC_TUNING 0x0040 #define SDHCI_CTRL_TUNED_CLK 0x0080 +#define SDHCI_CTRL_V4_MODE 0x1000 #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000 #define SDHCI_CAPABILITIES 0x40 @@ -565,6 +566,9 @@ struct sdhci_host { u64 data_timeout; + /* Host Version 4 Enable */ + bool v4_mode; + unsigned long private[0] ____cacheline_aligned; }; @@ -747,5 +751,6 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error, int *data_error); void sdhci_dumpregs(struct sdhci_host *host); +void sdhci_enable_v4_mode(struct sdhci_host *host); #endif /* __SDHCI_HW_H */
For SD host controller version 4.00 or later ones, there're two modes of implementation - Version 3.00 compatible mode or Version 4 mode. This patch introduced an interface to enable v4 mode. Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> --- drivers/mmc/host/sdhci.c | 28 ++++++++++++++++++++++++++++ drivers/mmc/host/sdhci.h | 5 +++++ 2 files changed, 33 insertions(+) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html