// SPDX-License-Identifier: GPL-2.0 /* * Renesas SDHI * * Copyright (C) 2015-19 Renesas Electronics Corporation * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang * Copyright (C) 2016-17 Horms Solutions, Simon Horman * Copyright (C) 2009 Magnus Damm * * Based on "Compaq ASIC3 support": * * Copyright 2001 Compaq Computer Corporation. * Copyright 2004-2005 Phil Blundell * Copyright 2007-2008 OpenedHand Ltd. * * Authors: Phil Blundell , * Samuel Ortiz * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "renesas_sdhi.h" #include "tmio_mmc.h" #define CTL_HOST_MODE 0xe4 #define HOST_MODE_GEN2_SDR50_WMODE BIT(0) #define HOST_MODE_GEN2_SDR104_WMODE BIT(0) #define HOST_MODE_GEN3_WMODE BIT(0) #define HOST_MODE_GEN3_BUSWIDTH BIT(8) #define HOST_MODE_GEN3_16BIT HOST_MODE_GEN3_WMODE #define HOST_MODE_GEN3_32BIT (HOST_MODE_GEN3_WMODE | HOST_MODE_GEN3_BUSWIDTH) #define HOST_MODE_GEN3_64BIT 0 #define SDHI_VER_GEN2_SDR50 0x490c #define SDHI_VER_RZ_A1 0x820b /* very old datasheets said 0x490c for SDR104, too. They are wrong! */ #define SDHI_VER_GEN2_SDR104 0xcb0d #define SDHI_VER_GEN3_SD 0xcc10 #define SDHI_VER_GEN3_SDMMC 0xcd10 #define SDHI_GEN3_MMC0_ADDR 0xee140000 static void renesas_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width) { u32 val; /* * see also * renesas_sdhi_of_data :: dma_buswidth */ switch (sd_ctrl_read16(host, CTL_VERSION)) { case SDHI_VER_GEN2_SDR50: val = (width == 32) ? HOST_MODE_GEN2_SDR50_WMODE : 0; break; case SDHI_VER_GEN2_SDR104: val = (width == 32) ? 0 : HOST_MODE_GEN2_SDR104_WMODE; break; case SDHI_VER_GEN3_SD: case SDHI_VER_GEN3_SDMMC: if (width == 64) val = HOST_MODE_GEN3_64BIT; else if (width == 32) val = HOST_MODE_GEN3_32BIT; else val = HOST_MODE_GEN3_16BIT; break; default: /* nothing to do */ return; } sd_ctrl_write16(host, CTL_HOST_MODE, val); } static int renesas_sdhi_clk_enable(struct tmio_mmc_host *host) { struct mmc_host *mmc = host->mmc; struct renesas_sdhi *priv = host_to_priv(host); int ret; ret = clk_prepare_enable(priv->clk_cd); if (ret < 0) return ret; /* * The clock driver may not know what maximum frequency * actually works, so it should be set with the max-frequency * property which will already have been read to f_max. If it * was missing, assume the current frequency is the maximum. */ if (!mmc->f_max) mmc->f_max = clk_get_rate(priv->clk); /* * Minimum frequency is the minimum input clock frequency * divided by our maximum divider. */ mmc->f_min = max(clk_round_rate(priv->clk, 1) / 512, 1L); /* enable 16bit data access on SDBUF as default */ renesas_sdhi_sdbuf_width(host, 16); return 0; } static unsigned int renesas_sdhi_clk_update(struct tmio_mmc_host *host, unsigned int new_clock) { struct renesas_sdhi *priv = host_to_priv(host); unsigned int freq, diff, best_freq = 0, diff_min = ~0; int i; /* * We simply return the current rate if a) we are not on a R-Car Gen2+ * SoC (may work for others, but untested) or b) if the SCC needs its * clock during tuning, so we don't change the external clock setup. */ if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2) || mmc_doing_tune(host->mmc)) return clk_get_rate(priv->clk); /* * We want the bus clock to be as close as possible to, but no * greater than, new_clock. As we can divide by 1 << i for * any i in [0, 9] we want the input clock to be as close as * possible, but no greater than, new_clock << i. */ for (i = min(9, ilog2(UINT_MAX / new_clock)); i >= 0; i--) { freq = clk_round_rate(priv->clk, new_clock << i); if (freq > (new_clock << i)) { /* Too fast; look for a slightly slower option */ freq = clk_round_rate(priv->clk, (new_clock << i) / 4 * 3); if (freq > (new_clock << i)) continue; } diff = new_clock - (freq >> i); if (diff <= diff_min) { best_freq = freq; diff_min = diff; } } clk_set_rate(priv->clk, best_freq); return clk_get_rate(priv->clk); } static void renesas_sdhi_set_clock(struct tmio_mmc_host *host, unsigned int new_clock) { u32 clk = 0, clock; sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); if (new_clock == 0) { host->mmc->actual_clock = 0; goto out; } host->mmc->actual_clock = renesas_sdhi_clk_update(host, new_clock); clock = host->mmc->actual_clock / 512; for (clk = 0x80000080; new_clock >= (clock << 1); clk >>= 1) clock <<= 1; /* 1/1 clock is option */ if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) && ((clk >> 22) & 0x1)) { if (!(host->mmc->ios.timing == MMC_TIMING_MMC_HS400)) clk |= 0xff; else clk &= ~0xff; } sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK); if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) usleep_range(10000, 11000); sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); out: /* HW engineers overrode docs: no sleep needed on R-Car2+ */ if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) usleep_range(10000, 11000); } static void renesas_sdhi_clk_disable(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); clk_disable_unprepare(priv->clk_cd); } static int renesas_sdhi_card_busy(struct mmc_host *mmc) { struct tmio_mmc_host *host = mmc_priv(mmc); return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & TMIO_STAT_DAT0); } static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) { struct tmio_mmc_host *host = mmc_priv(mmc); struct renesas_sdhi *priv = host_to_priv(host); struct pinctrl_state *pin_state; int ret; switch (ios->signal_voltage) { case MMC_SIGNAL_VOLTAGE_330: pin_state = priv->pins_default; break; case MMC_SIGNAL_VOLTAGE_180: pin_state = priv->pins_uhs; break; default: return -EINVAL; } /* * If anything is missing, assume signal voltage is fixed at * 3.3V and succeed/fail accordingly. */ if (IS_ERR(priv->pinctrl) || IS_ERR(pin_state)) return ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330 ? 0 : -EINVAL; ret = mmc_regulator_set_vqmmc(host->mmc, ios); if (ret < 0) return ret; return pinctrl_select_state(priv->pinctrl, pin_state); } /* SCC registers */ #define SH_MOBILE_SDHI_SCC_DTCNTL 0x000 #define SH_MOBILE_SDHI_SCC_TAPSET 0x002 #define SH_MOBILE_SDHI_SCC_DT2FF 0x004 #define SH_MOBILE_SDHI_SCC_CKSEL 0x006 #define SH_MOBILE_SDHI_SCC_RVSCNTL 0x008 #define SH_MOBILE_SDHI_SCC_RVSREQ 0x00A #define SH_MOBILE_SDHI_SCC_SMPCMP 0x00C #define SH_MOBILE_SDHI_SCC_TMPPORT2 0x00E #define SH_MOBILE_SDHI_SCC_TMPPORT3 0x014 #define SH_MOBILE_SDHI_SCC_TMPPORT4 0x016 #define SH_MOBILE_SDHI_SCC_TMPPORT5 0x018 #define SH_MOBILE_SDHI_SCC_TMPPORT6 0x01A #define SH_MOBILE_SDHI_SCC_TMPPORT7 0x01C #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN BIT(0) #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT 16 #define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK 0xff #define SH_MOBILE_SDHI_SCC_CKSEL_DTSEL BIT(0) #define SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN BIT(0) #define SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPDOWN BIT(0) #define SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPUP BIT(1) #define SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR BIT(2) #define SH_MOBILE_SDHI_SCC_SMPCMP_CMD_REQDOWN BIT(8) #define SH_MOBILE_SDHI_SCC_SMPCMP_CMD_REQUP BIT(24) #define SH_MOBILE_SDHI_SCC_SMPCMP_CMD_ERR (BIT(8) | BIT(24)) #define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL BIT(4) #define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN BIT(31) /* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT4 register */ #define SH_MOBILE_SDHI_SCC_TMPPORT4_DLL_ACC_START BIT(0) /* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT5 register */ #define SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_RW_SEL_R BIT(8) #define SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_RW_SEL_W (0 << 8) #define SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_ADR_MASK 0x3F /* Definitions for values the SH_MOBILE_SDHI_SCC register */ #define SH_MOBILE_SDHI_SCC_TMPPORT_DISABLE_WP_CODE 0xa5000000 #define SH_MOBILE_SDHI_SCC_TMPPORT_CALIB_CODE_MASK 0x1f #define SH_MOBILE_SDHI_SCC_TMPPORT_MANUAL_MODE BIT(7) static inline u32 sd_scc_read32(struct tmio_mmc_host *host, struct renesas_sdhi *priv, int addr) { return readl(priv->scc_ctl + (addr << host->bus_shift)); } static inline void sd_scc_write32(struct tmio_mmc_host *host, struct renesas_sdhi *priv, int addr, u32 val) { writel(val, priv->scc_ctl + (addr << host->bus_shift)); } static unsigned int renesas_sdhi_init_tuning(struct tmio_mmc_host *host) { struct renesas_sdhi *priv; priv = host_to_priv(host); /* Initialize SCC */ sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, 0x0); sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); /* set sampling clock selection range */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL, SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN | 0x8 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL, SH_MOBILE_SDHI_SCC_CKSEL_DTSEL | sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL, ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN & sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos); sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); /* Read TAPNUM */ return (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL) >> SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT) & SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK; } static void renesas_sdhi_hs400_complete(struct mmc_host *mmc) { struct tmio_mmc_host *host = mmc_priv(mmc); struct renesas_sdhi *priv = host_to_priv(host); u32 bad_taps = priv->quirks ? priv->quirks->hs400_bad_taps : 0; bool use_4tap = priv->quirks && priv->quirks->hs400_4taps; sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); /* Set HS400 mode */ sd_ctrl_write16(host, CTL_SDIF_MODE, SDIF_MODE_HS400 | sd_ctrl_read16(host, CTL_SDIF_MODE)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos_hs400); /* Gen3 can't do automatic tap correction with HS400, so disable it */ if (sd_ctrl_read16(host, CTL_VERSION) == SDHI_VER_GEN3_SDMMC) sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL, ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN & sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2, (SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN | SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) | sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL, SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN | sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL)); /* Avoid bad TAP */ if (bad_taps & BIT(priv->tap_set)) { u32 new_tap = (priv->tap_set + 1) % priv->tap_num; if (bad_taps & BIT(new_tap)) new_tap = (priv->tap_set - 1) % priv->tap_num; if (bad_taps & BIT(new_tap)) { new_tap = priv->tap_set; dev_dbg(&host->pdev->dev, "Can't handle three bad tap in a row\n"); } priv->tap_set = new_tap; } sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, priv->tap_set / (use_4tap ? 2 : 1)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL, SH_MOBILE_SDHI_SCC_CKSEL_DTSEL | sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL)); sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); if (priv->adjust_hs400_calib_table) priv->needs_adjust_hs400 = true; } static void renesas_sdhi_disable_scc(struct mmc_host *mmc) { struct tmio_mmc_host *host = mmc_priv(mmc); struct renesas_sdhi *priv = host_to_priv(host); sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL, ~SH_MOBILE_SDHI_SCC_CKSEL_DTSEL & sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL, ~SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN & sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL)); sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); } static u32 sd_scc_tmpport_read32(struct tmio_mmc_host *host, struct renesas_sdhi *priv, u32 addr) { /* read mode */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT5, SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_RW_SEL_R | (SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_ADR_MASK & addr)); /* access start and stop */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT4, SH_MOBILE_SDHI_SCC_TMPPORT4_DLL_ACC_START); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT4, 0); return sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT7); } static void sd_scc_tmpport_write32(struct tmio_mmc_host *host, struct renesas_sdhi *priv, u32 addr, u32 val) { /* write mode */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT5, SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_RW_SEL_W | (SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_ADR_MASK & addr)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT6, val); /* access start and stop */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT4, SH_MOBILE_SDHI_SCC_TMPPORT4_DLL_ACC_START); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT4, 0); } static void renesas_sdhi_adjust_hs400_mode_enable(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); u32 calib_code; /* disable write protect */ sd_scc_tmpport_write32(host, priv, 0x00, SH_MOBILE_SDHI_SCC_TMPPORT_DISABLE_WP_CODE); /* read calibration code and adjust */ calib_code = sd_scc_tmpport_read32(host, priv, 0x26); calib_code &= SH_MOBILE_SDHI_SCC_TMPPORT_CALIB_CODE_MASK; sd_scc_tmpport_write32(host, priv, 0x22, SH_MOBILE_SDHI_SCC_TMPPORT_MANUAL_MODE | priv->adjust_hs400_calib_table[calib_code]); /* set offset value to TMPPORT3, hardcoded to OFFSET0 (= 0x3) for now */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT3, 0x3); /* adjustment done, clear flag */ priv->needs_adjust_hs400 = false; } static void renesas_sdhi_adjust_hs400_mode_disable(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); /* disable write protect */ sd_scc_tmpport_write32(host, priv, 0x00, SH_MOBILE_SDHI_SCC_TMPPORT_DISABLE_WP_CODE); /* disable manual calibration */ sd_scc_tmpport_write32(host, priv, 0x22, 0); /* clear offset value of TMPPORT3 */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT3, 0); } static void renesas_sdhi_reset_hs400_mode(struct tmio_mmc_host *host, struct renesas_sdhi *priv) { sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); /* Reset HS400 mode */ sd_ctrl_write16(host, CTL_SDIF_MODE, ~SDIF_MODE_HS400 & sd_ctrl_read16(host, CTL_SDIF_MODE)); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2, ~(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN | SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) & sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2)); if (priv->quirks && (priv->quirks->hs400_calib_table || priv->quirks->hs400_bad_taps)) renesas_sdhi_adjust_hs400_mode_disable(host); sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); } static int renesas_sdhi_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios) { struct tmio_mmc_host *host = mmc_priv(mmc); renesas_sdhi_reset_hs400_mode(host, host_to_priv(host)); return 0; } static void renesas_sdhi_scc_reset(struct tmio_mmc_host *host, struct renesas_sdhi *priv) { renesas_sdhi_disable_scc(host->mmc); renesas_sdhi_reset_hs400_mode(host, priv); priv->needs_adjust_hs400 = false; sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL, ~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN & sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL)); } /* only populated for TMIO_MMC_MIN_RCAR2 */ static void renesas_sdhi_reset(struct tmio_mmc_host *host, bool preserve) { struct renesas_sdhi *priv = host_to_priv(host); int ret; u16 val; if (!preserve) { if (priv->rstc) { reset_control_reset(priv->rstc); /* Unknown why but without polling reset status, it will hang */ read_poll_timeout(reset_control_status, ret, ret == 0, 1, 100, false, priv->rstc); /* At least SDHI_VER_GEN2_SDR50 needs manual release of reset */ sd_ctrl_write16(host, CTL_RESET_SD, 0x0001); priv->needs_adjust_hs400 = false; renesas_sdhi_set_clock(host, host->clk_cache); } else if (priv->scc_ctl) { renesas_sdhi_scc_reset(host, priv); } } if (sd_ctrl_read16(host, CTL_VERSION) >= SDHI_VER_GEN3_SD) { val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT); val |= CARD_OPT_EXTOP; sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, val); } } static unsigned int renesas_sdhi_gen3_get_cycles(struct tmio_mmc_host *host) { u16 num, val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT); num = (val & CARD_OPT_TOP_MASK) >> CARD_OPT_TOP_SHIFT; return 1 << ((val & CARD_OPT_EXTOP ? 14 : 13) + num); } #define SH_MOBILE_SDHI_MIN_TAP_ROW 3 static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); unsigned int tap_start = 0, tap_end = 0, tap_cnt = 0, rs, re, i; unsigned int taps_size = priv->tap_num * 2, min_tap_row; unsigned long *bitmap; sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0); /* * When tuning CMD19 is issued twice for each tap, merge the * result requiring the tap to be good in both runs before * considering it for tuning selection. */ for (i = 0; i < taps_size; i++) { int offset = priv->tap_num * (i < priv->tap_num ? 1 : -1); if (!test_bit(i, priv->taps)) clear_bit(i + offset, priv->taps); if (!test_bit(i, priv->smpcmp)) clear_bit(i + offset, priv->smpcmp); } /* * If all TAP are OK, the sampling clock position is selected by * identifying the change point of data. */ if (bitmap_full(priv->taps, taps_size)) { bitmap = priv->smpcmp; min_tap_row = 1; } else { bitmap = priv->taps; min_tap_row = SH_MOBILE_SDHI_MIN_TAP_ROW; } /* * Find the longest consecutive run of successful probes. If that * is at least SH_MOBILE_SDHI_MIN_TAP_ROW probes long then use the * center index as the tap, otherwise bail out. */ bitmap_for_each_set_region(bitmap, rs, re, 0, taps_size) { if (re - rs > tap_cnt) { tap_end = re; tap_start = rs; tap_cnt = tap_end - tap_start; } } if (tap_cnt >= min_tap_row) priv->tap_set = (tap_start + tap_end) / 2 % priv->tap_num; else return -EIO; /* Set SCC */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, priv->tap_set); /* Enable auto re-tuning */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL, SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN | sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL)); return 0; } static int renesas_sdhi_execute_tuning(struct mmc_host *mmc, u32 opcode) { struct tmio_mmc_host *host = mmc_priv(mmc); struct renesas_sdhi *priv = host_to_priv(host); int i, ret; priv->tap_num = renesas_sdhi_init_tuning(host); if (!priv->tap_num) return 0; /* Tuning is not supported */ if (priv->tap_num * 2 >= sizeof(priv->taps) * BITS_PER_BYTE) { dev_err(&host->pdev->dev, "Too many taps, please update 'taps' in tmio_mmc_host!\n"); return -EINVAL; } bitmap_zero(priv->taps, priv->tap_num * 2); bitmap_zero(priv->smpcmp, priv->tap_num * 2); /* Issue CMD19 twice for each tap */ for (i = 0; i < 2 * priv->tap_num; i++) { int cmd_error = 0; /* Set sampling clock position */ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, i % priv->tap_num); if (mmc_send_tuning(mmc, opcode, &cmd_error) == 0) set_bit(i, priv->taps); if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_SMPCMP) == 0) set_bit(i, priv->smpcmp); if (cmd_error) mmc_send_abort_tuning(mmc, opcode); } ret = renesas_sdhi_select_tuning(host); if (ret < 0) renesas_sdhi_scc_reset(host, priv); return ret; } static bool renesas_sdhi_manual_correction(struct tmio_mmc_host *host, bool use_4tap) { struct renesas_sdhi *priv = host_to_priv(host); unsigned int new_tap = priv->tap_set, error_tap = priv->tap_set; u32 val; val = sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ); if (!val) return false; sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0); /* Change TAP position according to correction status */ if (sd_ctrl_read16(host, CTL_VERSION) == SDHI_VER_GEN3_SDMMC && host->mmc->ios.timing == MMC_TIMING_MMC_HS400) { u32 bad_taps = priv->quirks ? priv->quirks->hs400_bad_taps : 0; /* * With HS400, the DAT signal is based on DS, not CLK. * Therefore, use only CMD status. */ u32 smpcmp = sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_SMPCMP) & SH_MOBILE_SDHI_SCC_SMPCMP_CMD_ERR; if (!smpcmp) { return false; /* no error in CMD signal */ } else if (smpcmp == SH_MOBILE_SDHI_SCC_SMPCMP_CMD_REQUP) { new_tap++; error_tap--; } else if (smpcmp == SH_MOBILE_SDHI_SCC_SMPCMP_CMD_REQDOWN) { new_tap--; error_tap++; } else { return true; /* need retune */ } /* * When new_tap is a bad tap, we cannot change. Then, we compare * with the HS200 tuning result. When smpcmp[error_tap] is OK, * we can at least retune. */ if (bad_taps & BIT(new_tap % priv->tap_num)) return test_bit(error_tap % priv->tap_num, priv->smpcmp); } else { if (val & SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) return true; /* need retune */ else if (val & SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPUP) new_tap++; else if (val & SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPDOWN) new_tap--; else return false; } priv->tap_set = (new_tap % priv->tap_num); sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, priv->tap_set / (use_4tap ? 2 : 1)); return false; } static bool renesas_sdhi_auto_correction(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); /* Check SCC error */ if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ) & SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) { sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0); return true; } return false; } static bool renesas_sdhi_check_scc_error(struct tmio_mmc_host *host, struct mmc_request *mrq) { struct renesas_sdhi *priv = host_to_priv(host); bool use_4tap = priv->quirks && priv->quirks->hs400_4taps; bool ret = false; /* * Skip checking SCC errors when running on 4 taps in HS400 mode as * any retuning would still result in the same 4 taps being used. */ if (!(host->mmc->ios.timing == MMC_TIMING_UHS_SDR104) && !(host->mmc->ios.timing == MMC_TIMING_MMC_HS200) && !(host->mmc->ios.timing == MMC_TIMING_MMC_HS400 && !use_4tap)) return false; if (mmc_doing_tune(host->mmc)) return false; if (((mrq->cmd->error == -ETIMEDOUT) || (mrq->data && mrq->data->error == -ETIMEDOUT)) && ((host->mmc->caps & MMC_CAP_NONREMOVABLE) || (host->ops.get_cd && host->ops.get_cd(host->mmc)))) ret |= true; if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL) & SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN) ret |= renesas_sdhi_auto_correction(host); else ret |= renesas_sdhi_manual_correction(host, use_4tap); return ret; } static int renesas_sdhi_wait_idle(struct tmio_mmc_host *host, u32 bit) { int timeout = 1000; /* CBSY is set when busy, SCLKDIVEN is cleared when busy */ u32 wait_state = (bit == TMIO_STAT_CMD_BUSY ? TMIO_STAT_CMD_BUSY : 0); while (--timeout && (sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & bit) == wait_state) udelay(1); if (!timeout) { dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n"); return -EBUSY; } return 0; } static int renesas_sdhi_write16_hook(struct tmio_mmc_host *host, int addr) { u32 bit = TMIO_STAT_SCLKDIVEN; switch (addr) { case CTL_SD_CMD: case CTL_STOP_INTERNAL_ACTION: case CTL_XFER_BLK_COUNT: case CTL_SD_XFER_LEN: case CTL_SD_MEM_CARD_OPT: case CTL_TRANSACTION_CTL: case CTL_DMA_ENABLE: case CTL_HOST_MODE: if (host->pdata->flags & TMIO_MMC_HAVE_CBSY) bit = TMIO_STAT_CMD_BUSY; fallthrough; case CTL_SD_CARD_CLK_CTL: return renesas_sdhi_wait_idle(host, bit); } return 0; } static int renesas_sdhi_multi_io_quirk(struct mmc_card *card, unsigned int direction, int blk_size) { /* * In Renesas controllers, when performing a * multiple block read of one or two blocks, * depending on the timing with which the * response register is read, the response * value may not be read properly. * Use single block read for this HW bug */ if ((direction == MMC_DATA_READ) && blk_size == 2) return 1; return blk_size; } static void renesas_sdhi_fixup_request(struct tmio_mmc_host *host, struct mmc_request *mrq) { struct renesas_sdhi *priv = host_to_priv(host); if (priv->needs_adjust_hs400 && mrq->cmd->opcode == MMC_SEND_STATUS) renesas_sdhi_adjust_hs400_mode_enable(host); } static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable) { /* Iff regs are 8 byte apart, sdbuf is 64 bit. Otherwise always 32. */ int width = (host->bus_shift == 2) ? 64 : 32; sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0); renesas_sdhi_sdbuf_width(host, enable ? width : 16); } int renesas_sdhi_probe(struct platform_device *pdev, const struct tmio_mmc_dma_ops *dma_ops, const struct renesas_sdhi_of_data *of_data, const struct renesas_sdhi_quirks *quirks) { struct tmio_mmc_data *mmd = pdev->dev.platform_data; struct tmio_mmc_data *mmc_data; struct tmio_mmc_dma *dma_priv; struct tmio_mmc_host *host; struct renesas_sdhi *priv; int num_irqs, irq, ret, i; struct resource *res; u16 ver; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -EINVAL; priv = devm_kzalloc(&pdev->dev, sizeof(struct renesas_sdhi), GFP_KERNEL); if (!priv) return -ENOMEM; priv->quirks = quirks; mmc_data = &priv->mmc_data; dma_priv = &priv->dma_priv; priv->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(priv->clk)) { ret = PTR_ERR(priv->clk); dev_err(&pdev->dev, "cannot get clock: %d\n", ret); return ret; } /* * Some controllers provide a 2nd clock just to run the internal card * detection logic. Unfortunately, the existing driver architecture does * not support a separation of clocks for runtime PM usage. When * native hotplug is used, the tmio driver assumes that the core * must continue to run for card detect to stay active, so we cannot * disable it. * Additionally, it is prohibited to supply a clock to the core but not * to the card detect circuit. That leaves us with if separate clocks * are presented, we must treat them both as virtually 1 clock. */ priv->clk_cd = devm_clk_get(&pdev->dev, "cd"); if (IS_ERR(priv->clk_cd)) priv->clk_cd = NULL; priv->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); if (IS_ERR(priv->rstc)) return PTR_ERR(priv->rstc); priv->pinctrl = devm_pinctrl_get(&pdev->dev); if (!IS_ERR(priv->pinctrl)) { priv->pins_default = pinctrl_lookup_state(priv->pinctrl, PINCTRL_STATE_DEFAULT); priv->pins_uhs = pinctrl_lookup_state(priv->pinctrl, "state_uhs"); } host = tmio_mmc_host_alloc(pdev, mmc_data); if (IS_ERR(host)) return PTR_ERR(host); if (of_data) { mmc_data->flags |= of_data->tmio_flags; mmc_data->ocr_mask = of_data->tmio_ocr_mask; mmc_data->capabilities |= of_data->capabilities; mmc_data->capabilities2 |= of_data->capabilities2; mmc_data->dma_rx_offset = of_data->dma_rx_offset; mmc_data->max_blk_count = of_data->max_blk_count; mmc_data->max_segs = of_data->max_segs; dma_priv->dma_buswidth = of_data->dma_buswidth; host->bus_shift = of_data->bus_shift; } host->write16_hook = renesas_sdhi_write16_hook; host->clk_enable = renesas_sdhi_clk_enable; host->clk_disable = renesas_sdhi_clk_disable; host->set_clock = renesas_sdhi_set_clock; host->multi_io_quirk = renesas_sdhi_multi_io_quirk; host->dma_ops = dma_ops; if (quirks && quirks->hs400_disabled) host->mmc->caps2 &= ~(MMC_CAP2_HS400 | MMC_CAP2_HS400_ES); /* For some SoC, we disable internal WP. GPIO may override this */ if (mmc_can_gpio_ro(host->mmc)) mmc_data->capabilities2 &= ~MMC_CAP2_NO_WRITE_PROTECT; /* SDR speeds are only available on Gen2+ */ if (mmc_data->flags & TMIO_MMC_MIN_RCAR2) { /* card_busy caused issues on r8a73a4 (pre-Gen2) CD-less SDHI */ host->ops.card_busy = renesas_sdhi_card_busy; host->ops.start_signal_voltage_switch = renesas_sdhi_start_signal_voltage_switch; host->sdcard_irq_setbit_mask = TMIO_STAT_ALWAYS_SET_27; host->sdcard_irq_mask_all = TMIO_MASK_ALL_RCAR2; host->reset = renesas_sdhi_reset; } /* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */ if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */ host->bus_shift = 1; if (mmd) *mmc_data = *mmd; dma_priv->filter = shdma_chan_filter; dma_priv->enable = renesas_sdhi_enable_dma; mmc_data->alignment_shift = 1; /* 2-byte alignment */ mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED; /* * All SDHI blocks support 2-byte and larger block sizes in 4-bit * bus width mode. */ mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES; /* * All SDHI blocks support SDIO IRQ signalling. */ mmc_data->flags |= TMIO_MMC_SDIO_IRQ; /* All SDHI have CMD12 control bit */ mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL; /* All SDHI have SDIO status bits which must be 1 */ mmc_data->flags |= TMIO_MMC_SDIO_STATUS_SETBITS; /* All SDHI support HW busy detection */ mmc_data->flags |= TMIO_MMC_USE_BUSY_TIMEOUT; dev_pm_domain_start(&pdev->dev); ret = renesas_sdhi_clk_enable(host); if (ret) goto efree; ver = sd_ctrl_read16(host, CTL_VERSION); /* GEN2_SDR104 is first known SDHI to use 32bit block count */ if (ver < SDHI_VER_GEN2_SDR104 && mmc_data->max_blk_count > U16_MAX) mmc_data->max_blk_count = U16_MAX; /* One Gen2 SDHI incarnation does NOT have a CBSY bit */ if (ver == SDHI_VER_GEN2_SDR50) mmc_data->flags &= ~TMIO_MMC_HAVE_CBSY; if (ver == SDHI_VER_GEN3_SDMMC && quirks && quirks->hs400_calib_table) { host->fixup_request = renesas_sdhi_fixup_request; priv->adjust_hs400_calib_table = *( res->start == SDHI_GEN3_MMC0_ADDR ? quirks->hs400_calib_table : quirks->hs400_calib_table + 1); } /* these have an EXTOP bit */ if (ver >= SDHI_VER_GEN3_SD) host->get_timeout_cycles = renesas_sdhi_gen3_get_cycles; /* Check for SCC so we can reset it if needed */ if (of_data && of_data->scc_offset && ver >= SDHI_VER_GEN2_SDR104) priv->scc_ctl = host->ctl + of_data->scc_offset; /* Enable tuning iff we have an SCC and a supported mode */ if (priv->scc_ctl && (host->mmc->caps & MMC_CAP_UHS_SDR104 || host->mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V))) { const struct renesas_sdhi_scc *taps = of_data->taps; bool use_4tap = priv->quirks && priv->quirks->hs400_4taps; bool hit = false; for (i = 0; i < of_data->taps_num; i++) { if (taps[i].clk_rate == 0 || taps[i].clk_rate == host->mmc->f_max) { priv->scc_tappos = taps->tap; priv->scc_tappos_hs400 = use_4tap ? taps->tap_hs400_4tap : taps->tap; hit = true; break; } } if (!hit) dev_warn(&host->pdev->dev, "Unknown clock rate for tuning\n"); host->check_retune = renesas_sdhi_check_scc_error; host->ops.execute_tuning = renesas_sdhi_execute_tuning; host->ops.prepare_hs400_tuning = renesas_sdhi_prepare_hs400_tuning; host->ops.hs400_downgrade = renesas_sdhi_disable_scc; host->ops.hs400_complete = renesas_sdhi_hs400_complete; } ret = tmio_mmc_host_probe(host); if (ret < 0) goto edisclk; num_irqs = platform_irq_count(pdev); if (num_irqs < 0) { ret = num_irqs; goto eirq; } /* There must be at least one IRQ source */ if (!num_irqs) { ret = -ENXIO; goto eirq; } for (i = 0; i < num_irqs; i++) { irq = platform_get_irq(pdev, i); if (irq < 0) { ret = irq; goto eirq; } ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0, dev_name(&pdev->dev), host); if (ret) goto eirq; } dev_info(&pdev->dev, "%s base at %pa, max clock rate %u MHz\n", mmc_hostname(host->mmc), &res->start, host->mmc->f_max / 1000000); return ret; eirq: tmio_mmc_host_remove(host); edisclk: renesas_sdhi_clk_disable(host); efree: tmio_mmc_host_free(host); return ret; } EXPORT_SYMBOL_GPL(renesas_sdhi_probe); int renesas_sdhi_remove(struct platform_device *pdev) { struct tmio_mmc_host *host = platform_get_drvdata(pdev); tmio_mmc_host_remove(host); renesas_sdhi_clk_disable(host); tmio_mmc_host_free(host); return 0; } EXPORT_SYMBOL_GPL(renesas_sdhi_remove); MODULE_LICENSE("GPL v2");