| Message ID | 1405111990-23452-1-git-send-email-sonnyrao@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 07/12/2014 05:53 AM, Sonny Rao wrote: > This patch changes the fifo reset code to follow the reset procedure > outlined in the documentation of Synopsys Mobile storage host databook. > > Signed-off-by: Sonny Rao <sonnyrao@chromium.org> > Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com> > --- > v2: Add Generic DMA support > per the documentation, move interrupt clear before wait > make the test for DMA host->use_dma rather than host->using_dma > add proper return values (although it appears no caller checks) > v3: rename fifo reset function, and change callers > use this combined reset function in dw_mci_resume() > just one caller left (probe), so get rid of dw_mci_ctrl_all_reset() > use DMA reset bit for all systems which use DMA > remove extra IDMAC reset in dw_mci_work_routine_card() > do CIU clock update in error path, if CIU reset cleared > v4: remove comment about FIFO reset in dw_mci_work_routine_card() > move down error message when control reset clears but others don't > and clarify the error stating that we will still update clocks > make flags for all reset bits a macro > v5: don't use dw_mci_reset() in dw_mci_resume() and instead match what > is done in dw_mci_probe() and don't force inline dw_mci_resume() > --- > drivers/mmc/host/dw_mmc.c | 86 ++++++++++++++++++++++++++++++++++------------- > drivers/mmc/host/dw_mmc.h | 5 +++ > 2 files changed, 68 insertions(+), 23 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index 55cd110..db25494 100644 > --- a/drivers/mmc/host/dw_mmc.c > +++ b/drivers/mmc/host/dw_mmc.c > @@ -111,8 +111,7 @@ static const u8 tuning_blk_pattern_8bit[] = { > 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, > }; > > -static inline bool dw_mci_fifo_reset(struct dw_mci *host); > -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host); > +static bool dw_mci_reset(struct dw_mci *host); > > #if defined(CONFIG_DEBUG_FS) > static int dw_mci_req_show(struct seq_file *s, void *v) > @@ -1254,7 +1253,7 @@ static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data) > * After an error, there may be data lingering > * in the FIFO > */ > - dw_mci_fifo_reset(host); > + dw_mci_reset(host); > } else { > data->bytes_xfered = data->blocks * data->blksz; > data->error = 0; > @@ -1371,7 +1370,7 @@ static void dw_mci_tasklet_func(unsigned long priv) > > /* CMD error in data command */ > if (mrq->cmd->error && mrq->data) > - dw_mci_fifo_reset(host); > + dw_mci_reset(host); > > host->cmd = NULL; > host->data = NULL; > @@ -1982,14 +1981,8 @@ static void dw_mci_work_routine_card(struct work_struct *work) > } > > /* Power down slot */ > - if (present == 0) { > - /* Clear down the FIFO */ > - dw_mci_fifo_reset(host); > -#ifdef CONFIG_MMC_DW_IDMAC > - dw_mci_idmac_reset(host); > -#endif > - > - } > + if (present == 0) > + dw_mci_reset(host); > > spin_unlock_bh(&host->lock); > > @@ -2323,8 +2316,11 @@ static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset) > return false; > } > > -static inline bool dw_mci_fifo_reset(struct dw_mci *host) > +static bool dw_mci_reset(struct dw_mci *host) > { > + u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET; > + bool ret = false; > + > /* > * Reseting generates a block interrupt, hence setting > * the scatter-gather pointer to NULL. > @@ -2334,15 +2330,59 @@ static inline bool dw_mci_fifo_reset(struct dw_mci *host) > host->sg = NULL; > } > > - return dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET); > -} > + if (host->use_dma) > + flags |= SDMMC_CTRL_DMA_RESET; > > -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host) > -{ > - return dw_mci_ctrl_reset(host, > - SDMMC_CTRL_FIFO_RESET | > - SDMMC_CTRL_RESET | > - SDMMC_CTRL_DMA_RESET); > + if (dw_mci_ctrl_reset(host, flags)) { > + /* > + * In all cases we clear the RAWINTS register to clear any > + * interrupts. > + */ > + mci_writel(host, RINTSTS, 0xFFFFFFFF); > + > + /* if using dma we wait for dma_req to clear */ > + if (host->use_dma) { > + unsigned long timeout = jiffies + msecs_to_jiffies(500); > + u32 status; > + do { > + status = mci_readl(host, STATUS); > + if (!(status & SDMMC_STATUS_DMA_REQ)) > + break; > + cpu_relax(); > + } while (time_before(jiffies, timeout)); > + > + if (status & SDMMC_STATUS_DMA_REQ) { > + dev_err(host->dev, > + "%s: Timeout waiting for dma_req to " > + "clear during reset", __func__); Could you add the "\n"? > + goto ciu_out; > + } > + > + /* when using DMA next we reset the fifo again */ > + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET)) > + goto ciu_out; > + } > + } else { > + /* if the controller reset bit did clear, then set clock regs */ > + if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) { > + dev_err(host->dev, "%s: fifo/dma reset bits didn't " > + "clear but ciu was reset, doing clock update.", > + __func__); Ditto. > + goto ciu_out; > + } > + } > + > + if (IS_ENABLED(CONFIG_MMC_DW_IDMAC)) > + /* It is also recommended that we reset and reprogram idmac */ > + dw_mci_idmac_reset(host); > + > + ret = true; > + > +ciu_out: > + /* After a CTRL reset we need to have CIU set clock registers */ > + mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0); > + > + return ret; > } > > #ifdef CONFIG_OF > @@ -2555,7 +2595,7 @@ int dw_mci_probe(struct dw_mci *host) > } > > /* Reset all blocks */ > - if (!dw_mci_ctrl_all_reset(host)) > + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) > return -ENODEV; > > host->dma_ops = host->pdata->dma_ops; > @@ -2744,7 +2784,7 @@ int dw_mci_resume(struct dw_mci *host) > } > } > > - if (!dw_mci_ctrl_all_reset(host)) { > + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) { > ret = -ENODEV; > return ret; > } > diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h > index 6bf24ab..9ab8ccd 100644 > --- a/drivers/mmc/host/dw_mmc.h > +++ b/drivers/mmc/host/dw_mmc.h > @@ -129,6 +129,7 @@ > #define SDMMC_CMD_INDX(n) ((n) & 0x1F) > /* Status register defines */ > #define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF) > +#define SDMMC_STATUS_DMA_REQ BIT(31) > /* FIFOTH register defines */ > #define SDMMC_SET_FIFOTH(m, r, t) (((m) & 0x7) << 28 | \ > ((r) & 0xFFF) << 16 | \ > @@ -150,6 +151,10 @@ > /* Card read threshold */ > #define SDMMC_SET_RD_THLD(v, x) (((v) & 0x1FFF) << 16 | (x)) > > +/* All ctrl reset bits */ > +#define SDMMC_CTRL_ALL_RESET_FLAGS \ > + (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET) > + > /* Register access macros */ > #define mci_readl(dev, reg) \ > __raw_readl((dev)->regs + SDMMC_##reg) > -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" 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/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 55cd110..db25494 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -111,8 +111,7 @@ static const u8 tuning_blk_pattern_8bit[] = { 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, }; -static inline bool dw_mci_fifo_reset(struct dw_mci *host); -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host); +static bool dw_mci_reset(struct dw_mci *host); #if defined(CONFIG_DEBUG_FS) static int dw_mci_req_show(struct seq_file *s, void *v) @@ -1254,7 +1253,7 @@ static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data) * After an error, there may be data lingering * in the FIFO */ - dw_mci_fifo_reset(host); + dw_mci_reset(host); } else { data->bytes_xfered = data->blocks * data->blksz; data->error = 0; @@ -1371,7 +1370,7 @@ static void dw_mci_tasklet_func(unsigned long priv) /* CMD error in data command */ if (mrq->cmd->error && mrq->data) - dw_mci_fifo_reset(host); + dw_mci_reset(host); host->cmd = NULL; host->data = NULL; @@ -1982,14 +1981,8 @@ static void dw_mci_work_routine_card(struct work_struct *work) } /* Power down slot */ - if (present == 0) { - /* Clear down the FIFO */ - dw_mci_fifo_reset(host); -#ifdef CONFIG_MMC_DW_IDMAC - dw_mci_idmac_reset(host); -#endif - - } + if (present == 0) + dw_mci_reset(host); spin_unlock_bh(&host->lock); @@ -2323,8 +2316,11 @@ static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset) return false; } -static inline bool dw_mci_fifo_reset(struct dw_mci *host) +static bool dw_mci_reset(struct dw_mci *host) { + u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET; + bool ret = false; + /* * Reseting generates a block interrupt, hence setting * the scatter-gather pointer to NULL. @@ -2334,15 +2330,59 @@ static inline bool dw_mci_fifo_reset(struct dw_mci *host) host->sg = NULL; } - return dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET); -} + if (host->use_dma) + flags |= SDMMC_CTRL_DMA_RESET; -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host) -{ - return dw_mci_ctrl_reset(host, - SDMMC_CTRL_FIFO_RESET | - SDMMC_CTRL_RESET | - SDMMC_CTRL_DMA_RESET); + if (dw_mci_ctrl_reset(host, flags)) { + /* + * In all cases we clear the RAWINTS register to clear any + * interrupts. + */ + mci_writel(host, RINTSTS, 0xFFFFFFFF); + + /* if using dma we wait for dma_req to clear */ + if (host->use_dma) { + unsigned long timeout = jiffies + msecs_to_jiffies(500); + u32 status; + do { + status = mci_readl(host, STATUS); + if (!(status & SDMMC_STATUS_DMA_REQ)) + break; + cpu_relax(); + } while (time_before(jiffies, timeout)); + + if (status & SDMMC_STATUS_DMA_REQ) { + dev_err(host->dev, + "%s: Timeout waiting for dma_req to " + "clear during reset", __func__); + goto ciu_out; + } + + /* when using DMA next we reset the fifo again */ + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET)) + goto ciu_out; + } + } else { + /* if the controller reset bit did clear, then set clock regs */ + if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) { + dev_err(host->dev, "%s: fifo/dma reset bits didn't " + "clear but ciu was reset, doing clock update.", + __func__); + goto ciu_out; + } + } + + if (IS_ENABLED(CONFIG_MMC_DW_IDMAC)) + /* It is also recommended that we reset and reprogram idmac */ + dw_mci_idmac_reset(host); + + ret = true; + +ciu_out: + /* After a CTRL reset we need to have CIU set clock registers */ + mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0); + + return ret; } #ifdef CONFIG_OF @@ -2555,7 +2595,7 @@ int dw_mci_probe(struct dw_mci *host) } /* Reset all blocks */ - if (!dw_mci_ctrl_all_reset(host)) + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) return -ENODEV; host->dma_ops = host->pdata->dma_ops; @@ -2744,7 +2784,7 @@ int dw_mci_resume(struct dw_mci *host) } } - if (!dw_mci_ctrl_all_reset(host)) { + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) { ret = -ENODEV; return ret; } diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 6bf24ab..9ab8ccd 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -129,6 +129,7 @@ #define SDMMC_CMD_INDX(n) ((n) & 0x1F) /* Status register defines */ #define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF) +#define SDMMC_STATUS_DMA_REQ BIT(31) /* FIFOTH register defines */ #define SDMMC_SET_FIFOTH(m, r, t) (((m) & 0x7) << 28 | \ ((r) & 0xFFF) << 16 | \ @@ -150,6 +151,10 @@ /* Card read threshold */ #define SDMMC_SET_RD_THLD(v, x) (((v) & 0x1FFF) << 16 | (x)) +/* All ctrl reset bits */ +#define SDMMC_CTRL_ALL_RESET_FLAGS \ + (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET) + /* Register access macros */ #define mci_readl(dev, reg) \ __raw_readl((dev)->regs + SDMMC_##reg)