/* * SuperH Mobile SDHI * * Copyright (C) 2016 Sang Engineering, Wolfram Sang * Copyright (C) 2015-16 Renesas Electronics Corporation * Copyright (C) 2009 Magnus Damm * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * 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 "tmio_mmc.h" #define EXT_ACC 0xe4 #define SDHI_VER_GEN2_SDR50 0x490c /* 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 host_to_priv(host) container_of((host)->pdata, struct sh_mobile_sdhi, mmc_data) struct sh_mobile_sdhi_of_data { unsigned long tmio_flags; unsigned long capabilities; unsigned long capabilities2; enum dma_slave_buswidth dma_buswidth; dma_addr_t dma_rx_offset; unsigned bus_shift; }; static const struct sh_mobile_sdhi_of_data of_default_cfg = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT, }; static const struct sh_mobile_sdhi_of_data of_rcar_gen1_compatible = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE | TMIO_MMC_CLK_ACTUAL, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, }; static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE | TMIO_MMC_CLK_ACTUAL | TMIO_MMC_MIN_RCAR2, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES, .dma_rx_offset = 0x2000, }; static const struct sh_mobile_sdhi_of_data of_rcar_gen3_compatible = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE | TMIO_MMC_CLK_ACTUAL | TMIO_MMC_MIN_RCAR2, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, .bus_shift = 2, }; static const struct of_device_id sh_mobile_sdhi_of_match[] = { { .compatible = "renesas,sdhi-shmobile" }, { .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, }, { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, }, { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, }, { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, }, { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, }, { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_gen3_compatible, }, {}, }; MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match); struct sh_mobile_sdhi { struct clk *clk; struct tmio_mmc_data mmc_data; struct tmio_mmc_dma dma_priv; struct pinctrl *pinctrl; struct pinctrl_state *pins_default, *pins_uhs; }; static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width) { u32 val; /* * see also * sh_mobile_sdhi_of_data :: dma_buswidth */ switch (sd_ctrl_read16(host, CTL_VERSION)) { case SDHI_VER_GEN2_SDR50: val = (width == 32) ? 0x0001 : 0x0000; break; case SDHI_VER_GEN2_SDR104: val = (width == 32) ? 0x0000 : 0x0001; break; case SDHI_VER_GEN3_SD: case SDHI_VER_GEN3_SDMMC: if (width == 64) val = 0x0000; else if (width == 32) val = 0x0101; else val = 0x0001; break; default: /* nothing to do */ return; } sd_ctrl_write16(host, EXT_ACC, val); } static int sh_mobile_sdhi_clk_enable(struct tmio_mmc_host *host) { struct mmc_host *mmc = host->mmc; struct sh_mobile_sdhi *priv = host_to_priv(host); int ret = clk_prepare_enable(priv->clk); 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 */ sh_mobile_sdhi_sdbuf_width(host, 16); return 0; } static unsigned int sh_mobile_sdhi_clk_update(struct tmio_mmc_host *host, unsigned int new_clock) { struct sh_mobile_sdhi *priv = host_to_priv(host); unsigned int freq, diff, best_freq = 0, diff_min = ~0; int i, ret; /* tested only on RCar Gen2+ currently; may work for others */ if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) 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; } } ret = clk_set_rate(priv->clk, best_freq); return ret == 0 ? best_freq : clk_get_rate(priv->clk); } static void sh_mobile_sdhi_clk_disable(struct tmio_mmc_host *host) { struct sh_mobile_sdhi *priv = host_to_priv(host); clk_disable_unprepare(priv->clk); } static int sh_mobile_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 sh_mobile_sdhi_start_signal_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) { struct tmio_mmc_host *host = mmc_priv(mmc); struct sh_mobile_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) return ret; return pinctrl_select_state(priv->pinctrl, pin_state); } static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host) { int timeout = 1000; while (--timeout && !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & TMIO_STAT_SCLKDIVEN)) udelay(1); if (!timeout) { dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n"); return -EBUSY; } return 0; } static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr) { switch (addr) { case CTL_SD_CMD: case CTL_STOP_INTERNAL_ACTION: case CTL_XFER_BLK_COUNT: case CTL_SD_CARD_CLK_CTL: case CTL_SD_XFER_LEN: case CTL_SD_MEM_CARD_OPT: case CTL_TRANSACTION_CTL: case CTL_DMA_ENABLE: case EXT_ACC: return sh_mobile_sdhi_wait_idle(host); } return 0; } static int sh_mobile_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 sh_mobile_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable) { sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0); /* enable 32bit access if DMA mode if possibile */ sh_mobile_sdhi_sdbuf_width(host, enable ? 32 : 16); } static int sh_mobile_sdhi_probe(struct platform_device *pdev) { const struct of_device_id *of_id = of_match_device(sh_mobile_sdhi_of_match, &pdev->dev); struct sh_mobile_sdhi *priv; struct tmio_mmc_data *mmc_data; struct tmio_mmc_data *mmd = pdev->dev.platform_data; struct tmio_mmc_host *host; struct resource *res; int irq, ret, i = 0; struct tmio_mmc_dma *dma_priv; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -EINVAL; priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL); if (!priv) return -ENOMEM; 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); goto eprobe; } 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); if (!host) { ret = -ENOMEM; goto eprobe; } if (of_id && of_id->data) { const struct sh_mobile_sdhi_of_data *of_data = of_id->data; mmc_data->flags |= of_data->tmio_flags; mmc_data->capabilities |= of_data->capabilities; mmc_data->capabilities2 |= of_data->capabilities2; mmc_data->dma_rx_offset = of_data->dma_rx_offset; dma_priv->dma_buswidth = of_data->dma_buswidth; host->bus_shift = of_data->bus_shift; } host->dma = dma_priv; host->write16_hook = sh_mobile_sdhi_write16_hook; host->clk_enable = sh_mobile_sdhi_clk_enable; host->clk_update = sh_mobile_sdhi_clk_update; host->clk_disable = sh_mobile_sdhi_clk_disable; host->multi_io_quirk = sh_mobile_sdhi_multi_io_quirk; /* 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->card_busy = sh_mobile_sdhi_card_busy; host->start_signal_voltage_switch = sh_mobile_sdhi_start_signal_voltage_switch; } /* 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 = sh_mobile_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 controll bit */ mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL; /* * All SDHI need SDIO_INFO1 reserved bit */ mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK; ret = tmio_mmc_host_probe(host, mmc_data); if (ret < 0) goto efree; while (1) { irq = platform_get_irq(pdev, i); if (irq < 0) break; i++; ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0, dev_name(&pdev->dev), host); if (ret) goto eirq; } /* There must be at least one IRQ source */ if (!i) { ret = irq; goto eirq; } dev_info(&pdev->dev, "%s base at 0x%08lx max clock rate %u MHz\n", mmc_hostname(host->mmc), (unsigned long) (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start), host->mmc->f_max / 1000000); return ret; eirq: tmio_mmc_host_remove(host); efree: tmio_mmc_host_free(host); eprobe: return ret; } static int sh_mobile_sdhi_remove(struct platform_device *pdev) { struct mmc_host *mmc = platform_get_drvdata(pdev); struct tmio_mmc_host *host = mmc_priv(mmc); tmio_mmc_host_remove(host); return 0; } static const struct dev_pm_ops tmio_mmc_dev_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend, tmio_mmc_host_runtime_resume, NULL) }; static struct platform_driver sh_mobile_sdhi_driver = { .driver = { .name = "sh_mobile_sdhi", .pm = &tmio_mmc_dev_pm_ops, .of_match_table = sh_mobile_sdhi_of_match, }, .probe = sh_mobile_sdhi_probe, .remove = sh_mobile_sdhi_remove, }; module_platform_driver(sh_mobile_sdhi_driver); MODULE_DESCRIPTION("SuperH Mobile SDHI driver"); MODULE_AUTHOR("Magnus Damm"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:sh_mobile_sdhi");