1.Support cmd response and data tuning together. 2.Support hs400 cmd responese tuning.
Signed-off-by: mingming lee mingming.lee@mediatek.com --- Changes for v2: - add hs400 support --- drivers/mmc/mtk-sd.c | 209 +++++++++++++++++++++++++++++++++++++++---- 1 file changed, 193 insertions(+), 16 deletions(-)
diff --git a/drivers/mmc/mtk-sd.c b/drivers/mmc/mtk-sd.c index ffd647fac7..eaa584a4df 100644 --- a/drivers/mmc/mtk-sd.c +++ b/drivers/mmc/mtk-sd.c @@ -125,6 +125,9 @@ #define MSDC_PAD_TUNE_DATWRDLY_M 0x1f #define MSDC_PAD_TUNE_DATWRDLY_S 0
+#define PAD_CMD_TUNE_RX_DLY3 0x3E +#define PAD_CMD_TUNE_RX_DLY3_S 1 + /* EMMC50_CFG0 */ #define EMMC50_CFG_CFCSTS_SEL BIT(4)
@@ -209,7 +212,8 @@ struct mtk_sd_regs { u32 eco_ver; u32 reserved6[27]; u32 pad_ds_tune; - u32 reserved7[31]; + u32 pad_cmd_tune; + u32 reserved7[30]; u32 emmc50_cfg0; u32 reserved8[7]; u32 sdc_fifo_cfg; @@ -240,6 +244,7 @@ struct msdc_plat { struct msdc_tune_para { u32 iocon; u32 pad_tune; + u32 pad_cmd_tune; };
struct msdc_host { @@ -364,6 +369,8 @@ static u32 msdc_cmd_prepare_raw_cmd(struct msdc_host *host, case MMC_CMD_WRITE_SINGLE_BLOCK: case MMC_CMD_READ_SINGLE_BLOCK: case SD_CMD_APP_SEND_SCR: + case MMC_CMD_SEND_TUNING_BLOCK: + case MMC_CMD_SEND_TUNING_BLOCK_HS200: dtype = 1; break; case SD_CMD_SWITCH_FUNC: /* same as MMC_CMD_SWITCH */ @@ -469,6 +476,14 @@ static int msdc_start_command(struct msdc_host *host, struct mmc_cmd *cmd, if (!msdc_cmd_is_ready(host)) return -EIO;
+ if ((readl(&host->base->msdc_fifocs) & + MSDC_FIFOCS_TXCNT_M) >> MSDC_FIFOCS_TXCNT_S || + (readl(&host->base->msdc_fifocs) & + MSDC_FIFOCS_RXCNT_M) >> MSDC_FIFOCS_RXCNT_S) { + pr_err("TX/RX FIFO non-empty before start of IO. Reset\n"); + msdc_reset_hw(host); + } + msdc_fifo_clr(host);
host->last_resp_type = cmd->resp_type; @@ -652,14 +667,22 @@ static int msdc_ops_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, struct mmc_data *data) { struct msdc_host *host = dev_get_priv(dev); - int ret; + int cmd_ret, data_ret;
- ret = msdc_start_command(host, cmd, data); - if (ret) - return ret; + cmd_ret = msdc_start_command(host, cmd, data); + if (cmd_ret && + !(cmd_ret == -EIO && + (cmd->cmdidx == MMC_CMD_SEND_TUNING_BLOCK || + cmd->cmdidx == MMC_CMD_SEND_TUNING_BLOCK_HS200))) + return cmd_ret;
- if (data) - return msdc_start_data(host, data); + if (data) { + data_ret = msdc_start_data(host, data); + if (cmd_ret) + return cmd_ret; + else + return data_ret; + }
return 0; } @@ -941,6 +964,56 @@ static struct msdc_delay_phase get_best_delay(struct msdc_host *host, u32 delay) return delay_phase; }
+static int hs400_tune_response(struct udevice *dev, u32 opcode) +{ + struct msdc_plat *plat = dev_get_platdata(dev); + struct msdc_host *host = dev_get_priv(dev); + struct mmc *mmc = &plat->mmc; + u32 cmd_delay = 0; + struct msdc_delay_phase final_cmd_delay = { 0, }; + u8 final_delay; + void __iomem *tune_reg = &host->base->pad_cmd_tune; + int cmd_err; + int i, j; + + setbits_le32(&host->base->pad_cmd_tune, BIT(0)); + + if (mmc->selected_mode == MMC_HS_200 || + mmc->selected_mode == UHS_SDR104) + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_CMDRRDLY_M, + host->hs200_cmd_int_delay << + MSDC_PAD_TUNE_CMDRRDLY_S); + + if (host->r_smpl) + clrbits_le32(&host->base->msdc_iocon, MSDC_IOCON_RSPL); + else + setbits_le32(&host->base->msdc_iocon, MSDC_IOCON_RSPL); + + for (i = 0; i < PAD_DELAY_MAX; i++) { + clrsetbits_le32(tune_reg, PAD_CMD_TUNE_RX_DLY3, + i << PAD_CMD_TUNE_RX_DLY3_S); + + for (j = 0; j < 3; j++) { + mmc_send_tuning(mmc, opcode, &cmd_err); + if (!cmd_err) { + cmd_delay |= (1 << i); + } else { + cmd_delay &= ~(1 << i); + break; + } + } + } + + final_cmd_delay = get_best_delay(host, cmd_delay); + clrsetbits_le32(tune_reg, PAD_CMD_TUNE_RX_DLY3, + final_cmd_delay.final_phase << + PAD_CMD_TUNE_RX_DLY3_S); + final_delay = final_cmd_delay.final_phase; + + dev_err(dev, "Final cmd pad delay: %x\n", final_delay); + return final_delay == 0xff ? -EIO : 0; +} + static int msdc_tune_response(struct udevice *dev, u32 opcode) { struct msdc_plat *plat = dev_get_platdata(dev); @@ -1132,34 +1205,138 @@ skip_fall: return final_delay == 0xff ? -EIO : 0; }
+/* + * MSDC IP which supports data tune + async fifo can do CMD/DAT tune + * together, which can save the tuning time. + */ +static int msdc_tune_together(struct udevice *dev, u32 opcode) +{ + struct msdc_plat *plat = dev_get_platdata(dev); + struct msdc_host *host = dev_get_priv(dev); + struct mmc *mmc = &plat->mmc; + u32 rise_delay = 0, fall_delay = 0; + struct msdc_delay_phase final_rise_delay, final_fall_delay = { 0, }; + u8 final_delay, final_maxlen; + void __iomem *tune_reg = &host->base->pad_tune; + int i, ret; + + if (host->dev_comp->pad_tune0) + tune_reg = &host->base->pad_tune0; + + clrbits_le32(&host->base->msdc_iocon, MSDC_IOCON_DSPL); + clrbits_le32(&host->base->msdc_iocon, MSDC_IOCON_W_DSPL); + + for (i = 0; i < PAD_DELAY_MAX; i++) { + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_CMDRDLY_M, + i << MSDC_PAD_TUNE_CMDRDLY_S); + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_DATRRDLY_M, + i << MSDC_PAD_TUNE_DATRRDLY_S); + + ret = mmc_send_tuning(mmc, opcode, NULL); + if (!ret) + rise_delay |= (1 << i); + } + + final_rise_delay = get_best_delay(host, rise_delay); + if (final_rise_delay.maxlen >= 12 || + (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4)) + goto skip_fall; + + setbits_le32(&host->base->msdc_iocon, MSDC_IOCON_DSPL); + setbits_le32(&host->base->msdc_iocon, MSDC_IOCON_W_DSPL); + + for (i = 0; i < PAD_DELAY_MAX; i++) { + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_CMDRDLY_M, + i << MSDC_PAD_TUNE_CMDRDLY_S); + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_DATRRDLY_M, + i << MSDC_PAD_TUNE_DATRRDLY_S); + + ret = mmc_send_tuning(mmc, opcode, NULL); + if (!ret) + fall_delay |= (1 << i); + } + + final_fall_delay = get_best_delay(host, fall_delay); + +skip_fall: + final_maxlen = max(final_rise_delay.maxlen, final_fall_delay.maxlen); + if (final_maxlen == final_rise_delay.maxlen) { + clrbits_le32(&host->base->msdc_iocon, MSDC_IOCON_DSPL); + clrbits_le32(&host->base->msdc_iocon, MSDC_IOCON_W_DSPL); + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_CMDRDLY_M, + final_rise_delay.final_phase << + MSDC_PAD_TUNE_CMDRDLY_S); + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_DATRRDLY_M, + final_rise_delay.final_phase << + MSDC_PAD_TUNE_DATRRDLY_S); + final_delay = final_rise_delay.final_phase; + } else { + setbits_le32(&host->base->msdc_iocon, MSDC_IOCON_DSPL); + setbits_le32(&host->base->msdc_iocon, MSDC_IOCON_W_DSPL); + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_CMDRDLY_M, + final_fall_delay.final_phase << + MSDC_PAD_TUNE_CMDRDLY_S); + clrsetbits_le32(tune_reg, MSDC_PAD_TUNE_DATRRDLY_M, + final_fall_delay.final_phase << + MSDC_PAD_TUNE_DATRRDLY_S); + final_delay = final_fall_delay.final_phase; + } + + dev_err(dev, "Final pad delay: %x\n", final_delay); + + return final_delay == 0xff ? -EIO : 0; +} + static int msdc_execute_tuning(struct udevice *dev, uint opcode) { struct msdc_plat *plat = dev_get_platdata(dev); struct msdc_host *host = dev_get_priv(dev); struct mmc *mmc = &plat->mmc; - int ret; + int ret = 0; + + if (host->dev_comp->data_tune && host->dev_comp->async_fifo) { + ret = msdc_tune_together(dev, opcode); + if (ret == -EIO) { + dev_err(dev, "Tune fail!\n"); + return ret; + }
- if (mmc->selected_mode == MMC_HS_400) { - writel(host->hs400_ds_delay, &host->base->pad_ds_tune); - /* for hs400 mode it must be set to 0 */ - clrbits_le32(&host->base->patch_bit2, MSDC_PB2_CFGCRCSTS); - host->hs400_mode = true; + if (mmc->selected_mode == MMC_HS_400) { + clrbits_le32(&host->base->msdc_iocon, + MSDC_IOCON_DSPL | MSDC_IOCON_W_DSPL); + clrsetbits_le32(&host->base->pad_tune, + MSDC_PAD_TUNE_DATRRDLY_M, 0); + + writel(host->hs400_ds_delay, &host->base->pad_ds_tune); + /* for hs400 mode it must be set to 0 */ + clrbits_le32(&host->base->patch_bit2, + MSDC_PB2_CFGCRCSTS); + host->hs400_mode = true; + } + goto tune_done; }
- ret = msdc_tune_response(dev, opcode); + if (mmc->selected_mode == MMC_HS_400) + ret = hs400_tune_response(dev, opcode); + else + ret = msdc_tune_response(dev, opcode); if (ret == -EIO) { dev_err(dev, "Tune response fail!\n"); return ret; }
- if (!host->hs400_mode) { + if (mmc->selected_mode != MMC_HS_400) { ret = msdc_tune_data(dev, opcode); - if (ret == -EIO) + if (ret == -EIO) { dev_err(dev, "Tune data fail!\n"); + return ret; + } }
+tune_done: host->saved_tune_para.iocon = readl(&host->base->msdc_iocon); host->saved_tune_para.pad_tune = readl(&host->base->pad_tune); + host->saved_tune_para.pad_cmd_tune = readl(&host->base->pad_cmd_tune);
return ret; }