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/* * SuperH Mobile SDHI * * 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 <pb@handhelds.org>, * Samuel Ortiz <sameo@openedhand.com> * */ #include <linux/kernel.h> #include <linux/clk.h> #include <linux/slab.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/mmc/host.h> #include <linux/mmc/sh_mobile_sdhi.h> #include <linux/mfd/tmio.h> #include <linux/sh_dma.h> #include <linux/delay.h> #include "tmio_mmc.h" #define EXT_ACC 0xe4 #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; }; static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_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, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES, .dma_rx_offset = 0x2000, }; static const struct of_device_id sh_mobile_sdhi_of_match[] = { { .compatible = "renesas,sdhi-shmobile" }, { .compatible = "renesas,sdhi-sh7372" }, { .compatible = "renesas,sdhi-sh73a0", .data = &sh_mobile_sdhi_of_cfg[0], }, { .compatible = "renesas,sdhi-r8a73a4", .data = &sh_mobile_sdhi_of_cfg[0], }, { .compatible = "renesas,sdhi-r8a7740", .data = &sh_mobile_sdhi_of_cfg[0], }, { .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, }, {}, }; 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; }; 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 0x490C: val = (width == 32) ? 0x0001 : 0x0000; break; case 0xCB0D: val = (width == 32) ? 0x0000 : 0x0001; break; default: /* nothing to do */ return; } sd_ctrl_write16(host, EXT_ACC, val); } static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f) { struct mmc_host *mmc = platform_get_drvdata(pdev); struct tmio_mmc_host *host = mmc_priv(mmc); struct sh_mobile_sdhi *priv = host_to_priv(host); int ret = clk_prepare_enable(priv->clk); if (ret < 0) return ret; *f = clk_get_rate(priv->clk); /* enable 16bit data access on SDBUF as default */ sh_mobile_sdhi_sdbuf_width(host, 16); return 0; } static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev) { struct mmc_host *mmc = platform_get_drvdata(pdev); struct tmio_mmc_host *host = mmc_priv(mmc); struct sh_mobile_sdhi *priv = host_to_priv(host); clk_disable_unprepare(priv->clk); } static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host) { int timeout = 1000; while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13))) 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: 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; bool multiplexed_isr = true; 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 == NULL) { dev_err(&pdev->dev, "kzalloc failed\n"); 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; } host = tmio_mmc_host_alloc(pdev); if (!host) { ret = -ENOMEM; goto eprobe; } host->dma = dma_priv; host->write16_hook = sh_mobile_sdhi_write16_hook; host->clk_enable = sh_mobile_sdhi_clk_enable; host->clk_disable = sh_mobile_sdhi_clk_disable; host->multi_io_quirk = sh_mobile_sdhi_multi_io_quirk; /* SD control register space size is 0x100, 0x200 for bus_shift=1 */ if (resource_size(res) > 0x100) host->bus_shift = 1; else host->bus_shift = 0; 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; 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; } ret = tmio_mmc_host_probe(host, mmc_data); if (ret < 0) goto efree; /* * Allow one or more specific (named) ISRs or * one or more multiplexed (un-named) ISRs. */ irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT); if (irq >= 0) { multiplexed_isr = false; ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0, dev_name(&pdev->dev), host); if (ret) goto eirq; } irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO); if (irq >= 0) { multiplexed_isr = false; ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0, dev_name(&pdev->dev), host); if (ret) goto eirq; } irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD); if (irq >= 0) { multiplexed_isr = false; ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0, dev_name(&pdev->dev), host); if (ret) goto eirq; } else if (!multiplexed_isr) { dev_err(&pdev->dev, "Principal SD-card IRQ is missing among named interrupts\n"); ret = irq; goto eirq; } if (multiplexed_isr) { 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 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");


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