| Message ID | 1535526184-32718-5-git-send-email-zhang.chunyan@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mmc: add support for sdhci 4.0 | expand |
On 29/08/18 10:02, Chunyan Zhang wrote: > ADMA2 64-bit addressing support is divided into V3 mode and V4 mode. > So there are two kinds of descriptors for ADMA2 64-bit addressing > i.e. 96-bit Descriptor for V3 mode, and 128-bit Descriptor for V4 > mode. 128-bit Descriptor is aligned to 8-byte. > > For V4 mode, ADMA2 64-bit addressing is enabled via Host Control 2 > register. > > Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> Doesn't apply cleanly anymore, but nevertheless: Acked-by: Adrian Hunter <adrian.hunter@intel.com> > --- > drivers/mmc/host/sdhci.c | 92 +++++++++++++++++++++++++++++++++++------------- > drivers/mmc/host/sdhci.h | 12 +++++-- > 2 files changed, 78 insertions(+), 26 deletions(-) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index 6fb70da..17345b6 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -266,6 +266,52 @@ static void sdhci_set_default_irqs(struct sdhci_host *host) > sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); > } > > +static void sdhci_config_dma(struct sdhci_host *host) > +{ > + u8 ctrl; > + u16 ctrl2; > + > + if (host->version < SDHCI_SPEC_200) > + return; > + > + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); > + > + /* > + * Always adjust the DMA selection as some controllers > + * (e.g. JMicron) can't do PIO properly when the selection > + * is ADMA. > + */ > + ctrl &= ~SDHCI_CTRL_DMA_MASK; > + if (!(host->flags & SDHCI_REQ_USE_DMA)) > + goto out; > + > + /* Note if DMA Select is zero then SDMA is selected */ > + if (host->flags & SDHCI_USE_ADMA) > + ctrl |= SDHCI_CTRL_ADMA32; > + > + if (host->flags & SDHCI_USE_64_BIT_DMA) { > + /* > + * If v4 mode, all supported DMA can be 64-bit addressing if > + * controller supports 64-bit system address, otherwise only > + * ADMA can support 64-bit addressing. > + */ > + if (host->v4_mode) { > + ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); > + ctrl2 |= SDHCI_CTRL_64BIT_ADDR; > + sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); > + } else if (host->flags & SDHCI_USE_ADMA) { > + /* > + * Don't need to undo SDHCI_CTRL_ADMA32 in order to > + * set SDHCI_CTRL_ADMA64. > + */ > + ctrl |= SDHCI_CTRL_ADMA64; > + } > + } > + > +out: > + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); > +} > + > static void sdhci_init(struct sdhci_host *host, int soft) > { > struct mmc_host *mmc = host->mmc; > @@ -913,7 +959,6 @@ static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) > > static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) > { > - u8 ctrl; > struct mmc_data *data = cmd->data; > > host->data_timeout = 0; > @@ -1009,25 +1054,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) > } > } > > - /* > - * Always adjust the DMA selection as some controllers > - * (e.g. JMicron) can't do PIO properly when the selection > - * is ADMA. > - */ > - if (host->version >= SDHCI_SPEC_200) { > - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); > - ctrl &= ~SDHCI_CTRL_DMA_MASK; > - if ((host->flags & SDHCI_REQ_USE_DMA) && > - (host->flags & SDHCI_USE_ADMA)) { > - if (host->flags & SDHCI_USE_64_BIT_DMA) > - ctrl |= SDHCI_CTRL_ADMA64; > - else > - ctrl |= SDHCI_CTRL_ADMA32; > - } else { > - ctrl |= SDHCI_CTRL_SDMA; > - } > - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); > - } > + sdhci_config_dma(host); > > if (!(host->flags & SDHCI_REQ_USE_DMA)) { > int flags; > @@ -3511,6 +3538,19 @@ static int sdhci_allocate_bounce_buffer(struct sdhci_host *host) > return 0; > } > > +static inline bool sdhci_can_64bit_dma(struct sdhci_host *host) > +{ > + /* > + * According to SD Host Controller spec v4.10, bit[27] added from > + * version 4.10 in Capabilities Register is used as 64-bit System > + * Address support for V4 mode. > + */ > + if (host->version >= SDHCI_SPEC_410 && host->v4_mode) > + return host->caps & SDHCI_CAN_64BIT_V4; > + > + return host->caps & SDHCI_CAN_64BIT; > +} > + > int sdhci_setup_host(struct sdhci_host *host) > { > struct mmc_host *mmc; > @@ -3582,7 +3622,7 @@ int sdhci_setup_host(struct sdhci_host *host) > * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to > * implement. > */ > - if (host->caps & SDHCI_CAN_64BIT) > + if (sdhci_can_64bit_dma(host)) > host->flags |= SDHCI_USE_64_BIT_DMA; > > if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { > @@ -3616,8 +3656,8 @@ int sdhci_setup_host(struct sdhci_host *host) > */ > if (host->flags & SDHCI_USE_64_BIT_DMA) { > host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) * > - SDHCI_ADMA2_64_DESC_SZ; > - host->desc_sz = SDHCI_ADMA2_64_DESC_SZ; > + SDHCI_ADMA2_64_DESC_SZ(host); > + host->desc_sz = SDHCI_ADMA2_64_DESC_SZ(host); > } else { > host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) * > SDHCI_ADMA2_32_DESC_SZ; > @@ -3625,7 +3665,11 @@ int sdhci_setup_host(struct sdhci_host *host) > } > > host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN; > - buf = dma_alloc_coherent(mmc_dev(mmc), host->align_buffer_sz + > + /* > + * Use zalloc to zero the reserved high 32-bits of 128-bit > + * descriptors so that they never need to be written. > + */ > + buf = dma_zalloc_coherent(mmc_dev(mmc), host->align_buffer_sz + > host->adma_table_sz, &dma, GFP_KERNEL); > if (!buf) { > pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n", > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h > index 61611e3..c5cc513 100644 > --- a/drivers/mmc/host/sdhci.h > +++ b/drivers/mmc/host/sdhci.h > @@ -185,6 +185,7 @@ > #define SDHCI_CTRL_EXEC_TUNING 0x0040 > #define SDHCI_CTRL_TUNED_CLK 0x0080 > #define SDHCI_CTRL_V4_MODE 0x1000 > +#define SDHCI_CTRL_64BIT_ADDR 0x2000 > #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000 > > #define SDHCI_CAPABILITIES 0x40 > @@ -205,6 +206,7 @@ > #define SDHCI_CAN_VDD_330 0x01000000 > #define SDHCI_CAN_VDD_300 0x02000000 > #define SDHCI_CAN_VDD_180 0x04000000 > +#define SDHCI_CAN_64BIT_V4 0x08000000 > #define SDHCI_CAN_64BIT 0x10000000 > > #define SDHCI_SUPPORT_SDR50 0x00000001 > @@ -309,8 +311,14 @@ struct sdhci_adma2_32_desc { > */ > #define SDHCI_ADMA2_DESC_ALIGN 8 > > -/* ADMA2 64-bit DMA descriptor size */ > -#define SDHCI_ADMA2_64_DESC_SZ 12 > +/* > + * ADMA2 64-bit DMA descriptor size > + * According to SD Host Controller spec v4.10, there are two kinds of > + * descriptors for 64-bit addressing mode: 96-bit Descriptor and 128-bit > + * Descriptor, if Host Version 4 Enable is set in the Host Control 2 > + * register, 128-bit Descriptor will be selected. > + */ > +#define SDHCI_ADMA2_64_DESC_SZ(host) ((host)->v4_mode ? 16 : 12) > > /* > * ADMA2 64-bit descriptor. Note 12-byte descriptor can't always be 8-byte >
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6fb70da..17345b6 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -266,6 +266,52 @@ static void sdhci_set_default_irqs(struct sdhci_host *host) sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); } +static void sdhci_config_dma(struct sdhci_host *host) +{ + u8 ctrl; + u16 ctrl2; + + if (host->version < SDHCI_SPEC_200) + return; + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + + /* + * Always adjust the DMA selection as some controllers + * (e.g. JMicron) can't do PIO properly when the selection + * is ADMA. + */ + ctrl &= ~SDHCI_CTRL_DMA_MASK; + if (!(host->flags & SDHCI_REQ_USE_DMA)) + goto out; + + /* Note if DMA Select is zero then SDMA is selected */ + if (host->flags & SDHCI_USE_ADMA) + ctrl |= SDHCI_CTRL_ADMA32; + + if (host->flags & SDHCI_USE_64_BIT_DMA) { + /* + * If v4 mode, all supported DMA can be 64-bit addressing if + * controller supports 64-bit system address, otherwise only + * ADMA can support 64-bit addressing. + */ + if (host->v4_mode) { + ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + ctrl2 |= SDHCI_CTRL_64BIT_ADDR; + sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2); + } else if (host->flags & SDHCI_USE_ADMA) { + /* + * Don't need to undo SDHCI_CTRL_ADMA32 in order to + * set SDHCI_CTRL_ADMA64. + */ + ctrl |= SDHCI_CTRL_ADMA64; + } + } + +out: + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); +} + static void sdhci_init(struct sdhci_host *host, int soft) { struct mmc_host *mmc = host->mmc; @@ -913,7 +959,6 @@ static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd) static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) { - u8 ctrl; struct mmc_data *data = cmd->data; host->data_timeout = 0; @@ -1009,25 +1054,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) } } - /* - * Always adjust the DMA selection as some controllers - * (e.g. JMicron) can't do PIO properly when the selection - * is ADMA. - */ - if (host->version >= SDHCI_SPEC_200) { - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); - ctrl &= ~SDHCI_CTRL_DMA_MASK; - if ((host->flags & SDHCI_REQ_USE_DMA) && - (host->flags & SDHCI_USE_ADMA)) { - if (host->flags & SDHCI_USE_64_BIT_DMA) - ctrl |= SDHCI_CTRL_ADMA64; - else - ctrl |= SDHCI_CTRL_ADMA32; - } else { - ctrl |= SDHCI_CTRL_SDMA; - } - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); - } + sdhci_config_dma(host); if (!(host->flags & SDHCI_REQ_USE_DMA)) { int flags; @@ -3511,6 +3538,19 @@ static int sdhci_allocate_bounce_buffer(struct sdhci_host *host) return 0; } +static inline bool sdhci_can_64bit_dma(struct sdhci_host *host) +{ + /* + * According to SD Host Controller spec v4.10, bit[27] added from + * version 4.10 in Capabilities Register is used as 64-bit System + * Address support for V4 mode. + */ + if (host->version >= SDHCI_SPEC_410 && host->v4_mode) + return host->caps & SDHCI_CAN_64BIT_V4; + + return host->caps & SDHCI_CAN_64BIT; +} + int sdhci_setup_host(struct sdhci_host *host) { struct mmc_host *mmc; @@ -3582,7 +3622,7 @@ int sdhci_setup_host(struct sdhci_host *host) * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to * implement. */ - if (host->caps & SDHCI_CAN_64BIT) + if (sdhci_can_64bit_dma(host)) host->flags |= SDHCI_USE_64_BIT_DMA; if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { @@ -3616,8 +3656,8 @@ int sdhci_setup_host(struct sdhci_host *host) */ if (host->flags & SDHCI_USE_64_BIT_DMA) { host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) * - SDHCI_ADMA2_64_DESC_SZ; - host->desc_sz = SDHCI_ADMA2_64_DESC_SZ; + SDHCI_ADMA2_64_DESC_SZ(host); + host->desc_sz = SDHCI_ADMA2_64_DESC_SZ(host); } else { host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) * SDHCI_ADMA2_32_DESC_SZ; @@ -3625,7 +3665,11 @@ int sdhci_setup_host(struct sdhci_host *host) } host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN; - buf = dma_alloc_coherent(mmc_dev(mmc), host->align_buffer_sz + + /* + * Use zalloc to zero the reserved high 32-bits of 128-bit + * descriptors so that they never need to be written. + */ + buf = dma_zalloc_coherent(mmc_dev(mmc), host->align_buffer_sz + host->adma_table_sz, &dma, GFP_KERNEL); if (!buf) { pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n", diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 61611e3..c5cc513 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -185,6 +185,7 @@ #define SDHCI_CTRL_EXEC_TUNING 0x0040 #define SDHCI_CTRL_TUNED_CLK 0x0080 #define SDHCI_CTRL_V4_MODE 0x1000 +#define SDHCI_CTRL_64BIT_ADDR 0x2000 #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000 #define SDHCI_CAPABILITIES 0x40 @@ -205,6 +206,7 @@ #define SDHCI_CAN_VDD_330 0x01000000 #define SDHCI_CAN_VDD_300 0x02000000 #define SDHCI_CAN_VDD_180 0x04000000 +#define SDHCI_CAN_64BIT_V4 0x08000000 #define SDHCI_CAN_64BIT 0x10000000 #define SDHCI_SUPPORT_SDR50 0x00000001 @@ -309,8 +311,14 @@ struct sdhci_adma2_32_desc { */ #define SDHCI_ADMA2_DESC_ALIGN 8 -/* ADMA2 64-bit DMA descriptor size */ -#define SDHCI_ADMA2_64_DESC_SZ 12 +/* + * ADMA2 64-bit DMA descriptor size + * According to SD Host Controller spec v4.10, there are two kinds of + * descriptors for 64-bit addressing mode: 96-bit Descriptor and 128-bit + * Descriptor, if Host Version 4 Enable is set in the Host Control 2 + * register, 128-bit Descriptor will be selected. + */ +#define SDHCI_ADMA2_64_DESC_SZ(host) ((host)->v4_mode ? 16 : 12) /* * ADMA2 64-bit descriptor. Note 12-byte descriptor can't always be 8-byte
ADMA2 64-bit addressing support is divided into V3 mode and V4 mode. So there are two kinds of descriptors for ADMA2 64-bit addressing i.e. 96-bit Descriptor for V3 mode, and 128-bit Descriptor for V4 mode. 128-bit Descriptor is aligned to 8-byte. For V4 mode, ADMA2 64-bit addressing is enabled via Host Control 2 register. Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> --- drivers/mmc/host/sdhci.c | 92 +++++++++++++++++++++++++++++++++++------------- drivers/mmc/host/sdhci.h | 12 +++++-- 2 files changed, 78 insertions(+), 26 deletions(-)