diff options
Diffstat (limited to 'drivers/mmc/host/mmci.c')
| -rw-r--r-- | drivers/mmc/host/mmci.c | 128 |
1 files changed, 91 insertions, 37 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index df990bb8c873..01a804792f30 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -71,7 +71,12 @@ static unsigned int fmax = 515633; * @f_max: maximum clk frequency supported by the controller. * @signal_direction: input/out direction of bus signals can be indicated * @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock - * @busy_detect: true if busy detection on dat0 is supported + * @busy_detect: true if the variant supports busy detection on DAT0. + * @busy_dpsm_flag: bitmask enabling busy detection in the DPSM + * @busy_detect_flag: bitmask identifying the bit in the MMCISTATUS register + * indicating that the card is busy + * @busy_detect_mask: bitmask identifying the bit in the MMCIMASK0 to mask for + * getting busy end detection interrupts * @pwrreg_nopower: bits in MMCIPOWER don't controls ext. power supply * @explicit_mclk_control: enable explicit mclk control in driver. * @qcom_fifo: enables qcom specific fifo pio read logic. @@ -98,6 +103,9 @@ struct variant_data { bool signal_direction; bool pwrreg_clkgate; bool busy_detect; + u32 busy_dpsm_flag; + u32 busy_detect_flag; + u32 busy_detect_mask; bool pwrreg_nopower; bool explicit_mclk_control; bool qcom_fifo; @@ -137,7 +145,7 @@ static struct variant_data variant_u300 = { .clkreg_enable = MCI_ST_U300_HWFCEN, .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS, .datalength_bits = 16, - .datactrl_mask_sdio = MCI_ST_DPSM_SDIOEN, + .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN, .st_sdio = true, .pwrreg_powerup = MCI_PWR_ON, .f_max = 100000000, @@ -152,7 +160,7 @@ static struct variant_data variant_nomadik = { .clkreg = MCI_CLK_ENABLE, .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS, .datalength_bits = 24, - .datactrl_mask_sdio = MCI_ST_DPSM_SDIOEN, + .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN, .st_sdio = true, .st_clkdiv = true, .pwrreg_powerup = MCI_PWR_ON, @@ -170,7 +178,7 @@ static struct variant_data variant_ux500 = { .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS, .clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE, .datalength_bits = 24, - .datactrl_mask_sdio = MCI_ST_DPSM_SDIOEN, + .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN, .st_sdio = true, .st_clkdiv = true, .pwrreg_powerup = MCI_PWR_ON, @@ -178,6 +186,9 @@ static struct variant_data variant_ux500 = { .signal_direction = true, .pwrreg_clkgate = true, .busy_detect = true, + .busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE, + .busy_detect_flag = MCI_ST_CARDBUSY, + .busy_detect_mask = MCI_ST_BUSYENDMASK, .pwrreg_nopower = true, }; @@ -188,9 +199,9 @@ static struct variant_data variant_ux500v2 = { .clkreg_enable = MCI_ST_UX500_HWFCEN, .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS, .clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE, - .datactrl_mask_ddrmode = MCI_ST_DPSM_DDRMODE, + .datactrl_mask_ddrmode = MCI_DPSM_ST_DDRMODE, .datalength_bits = 24, - .datactrl_mask_sdio = MCI_ST_DPSM_SDIOEN, + .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN, .st_sdio = true, .st_clkdiv = true, .blksz_datactrl16 = true, @@ -199,6 +210,9 @@ static struct variant_data variant_ux500v2 = { .signal_direction = true, .pwrreg_clkgate = true, .busy_detect = true, + .busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE, + .busy_detect_flag = MCI_ST_CARDBUSY, + .busy_detect_mask = MCI_ST_BUSYENDMASK, .pwrreg_nopower = true, }; @@ -210,7 +224,7 @@ static struct variant_data variant_qcom = { MCI_QCOM_CLK_SELECT_IN_FBCLK, .clkreg_8bit_bus_enable = MCI_QCOM_CLK_WIDEBUS_8, .datactrl_mask_ddrmode = MCI_QCOM_CLK_SELECT_IN_DDR_MODE, - .data_cmd_enable = MCI_QCOM_CSPM_DATCMD, + .data_cmd_enable = MCI_CPSM_QCOM_DATCMD, .blksz_datactrl4 = true, .datalength_bits = 24, .pwrreg_powerup = MCI_PWR_UP, @@ -220,6 +234,7 @@ static struct variant_data variant_qcom = { .qcom_dml = true, }; +/* Busy detection for the ST Micro variant */ static int mmci_card_busy(struct mmc_host *mmc) { struct mmci_host *host = mmc_priv(mmc); @@ -227,7 +242,7 @@ static int mmci_card_busy(struct mmc_host *mmc) int busy = 0; spin_lock_irqsave(&host->lock, flags); - if (readl(host->base + MMCISTATUS) & MCI_ST_CARDBUSY) + if (readl(host->base + MMCISTATUS) & host->variant->busy_detect_flag) busy = 1; spin_unlock_irqrestore(&host->lock, flags); @@ -294,8 +309,8 @@ static void mmci_write_pwrreg(struct mmci_host *host, u32 pwr) */ static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl) { - /* Keep ST Micro busy mode if enabled */ - datactrl |= host->datactrl_reg & MCI_ST_DPSM_BUSYMODE; + /* Keep busy mode in DPSM if enabled */ + datactrl |= host->datactrl_reg & host->variant->busy_dpsm_flag; if (host->datactrl_reg != datactrl) { host->datactrl_reg = datactrl; @@ -684,8 +699,7 @@ static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data) next->dma_chan = NULL; } -static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq, - bool is_first_req) +static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct mmci_host *host = mmc_priv(mmc); struct mmc_data *data = mrq->data; @@ -973,37 +987,66 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd, unsigned int status) { void __iomem *base = host->base; - bool sbc, busy_resp; + bool sbc; if (!cmd) return; sbc = (cmd == host->mrq->sbc); - busy_resp = host->variant->busy_detect && (cmd->flags & MMC_RSP_BUSY); - if (!((status|host->busy_status) & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT| - MCI_CMDSENT|MCI_CMDRESPEND))) + /* + * We need to be one of these interrupts to be considered worth + * handling. Note that we tag on any latent IRQs postponed + * due to waiting for busy status. + */ + if (!((status|host->busy_status) & + (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND))) return; - /* Check if we need to wait for busy completion. */ - if (host->busy_status && (status & MCI_ST_CARDBUSY)) - return; + /* + * ST Micro variant: handle busy detection. + */ + if (host->variant->busy_detect) { + bool busy_resp = !!(cmd->flags & MMC_RSP_BUSY); - /* Enable busy completion if needed and supported. */ - if (!host->busy_status && busy_resp && - !(status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT)) && - (readl(base + MMCISTATUS) & MCI_ST_CARDBUSY)) { - writel(readl(base + MMCIMASK0) | MCI_ST_BUSYEND, - base + MMCIMASK0); - host->busy_status = status & (MCI_CMDSENT|MCI_CMDRESPEND); - return; - } + /* We are busy with a command, return */ + if (host->busy_status && + (status & host->variant->busy_detect_flag)) + return; + + /* + * We were not busy, but we now got a busy response on + * something that was not an error, and we double-check + * that the special busy status bit is still set before + * proceeding. + */ + if (!host->busy_status && busy_resp && + !(status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT)) && + (readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) { + /* Unmask the busy IRQ */ + writel(readl(base + MMCIMASK0) | + host->variant->busy_detect_mask, + base + MMCIMASK0); + /* + * Now cache the last response status code (until + * the busy bit goes low), and return. + */ + host->busy_status = + status & (MCI_CMDSENT|MCI_CMDRESPEND); + return; + } - /* At busy completion, mask the IRQ and complete the request. */ - if (host->busy_status) { - writel(readl(base + MMCIMASK0) & ~MCI_ST_BUSYEND, - base + MMCIMASK0); - host->busy_status = 0; + /* + * At this point we are not busy with a command, we have + * not received a new busy request, mask the busy IRQ and + * fall through to process the IRQ. + */ + if (host->busy_status) { + writel(readl(base + MMCIMASK0) & + ~host->variant->busy_detect_mask, + base + MMCIMASK0); + host->busy_status = 0; + } } host->cmd = NULL; @@ -1257,9 +1300,11 @@ static irqreturn_t mmci_irq(int irq, void *dev_id) mmci_data_irq(host, host->data, status); } - /* Don't poll for busy completion in irq context. */ - if (host->busy_status) - status &= ~MCI_ST_CARDBUSY; + /* + * Don't poll for busy completion in irq context. + */ + if (host->variant->busy_detect && host->busy_status) + status &= ~host->variant->busy_detect_flag; ret = 1; } while (status); @@ -1612,9 +1657,18 @@ static int mmci_probe(struct amba_device *dev, /* We support these capabilities. */ mmc->caps |= MMC_CAP_CMD23; + /* + * Enable busy detection. + */ if (variant->busy_detect) { mmci_ops.card_busy = mmci_card_busy; - mmci_write_datactrlreg(host, MCI_ST_DPSM_BUSYMODE); + /* + * Not all variants have a flag to enable busy detection + * in the DPSM, but if they do, set it here. + */ + if (variant->busy_dpsm_flag) + mmci_write_datactrlreg(host, + host->variant->busy_dpsm_flag); mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY; mmc->max_busy_timeout = 0; } |