/* * Copyright (C) 2010 Marvell International Ltd. * Zhangfei Gao * Kevin Wang * Mingwei Wang * Philip Rakity * Mark Brown * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sdhci.h" #include "sdhci-pltfm.h" #define SD_CLOCK_BURST_SIZE_SETUP 0x10A #define SDCLK_SEL 0x100 #define SDCLK_DELAY_SHIFT 9 #define SDCLK_DELAY_MASK 0x1f #define SD_CFG_FIFO_PARAM 0x100 #define SDCFG_GEN_PAD_CLK_ON (1<<6) #define SDCFG_GEN_PAD_CLK_CNT_MASK 0xFF #define SDCFG_GEN_PAD_CLK_CNT_SHIFT 24 #define SD_SPI_MODE 0x108 #define SD_CE_ATA_1 0x10C #define SD_CE_ATA_2 0x10E #define SDCE_MISC_INT (1<<2) #define SDCE_MISC_INT_EN (1<<1) static void pxav3_set_private_registers(struct sdhci_host *host, u8 mask) { struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc)); struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; if (mask == SDHCI_RESET_ALL) { /* * tune timing of read data/command when crc error happen * no performance impact */ if (pdata && 0 != pdata->clk_delay_cycles) { u16 tmp; tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK) << SDCLK_DELAY_SHIFT; tmp |= SDCLK_SEL; writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); } } } #define MAX_WAIT_COUNT 5 static void pxav3_gen_init_74_clocks(struct sdhci_host *host, u8 power_mode) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = pltfm_host->priv; u16 tmp; int count; if (pxa->power_mode == MMC_POWER_UP && power_mode == MMC_POWER_ON) { dev_dbg(mmc_dev(host->mmc), "%s: slot->power_mode = %d," "ios->power_mode = %d\n", __func__, pxa->power_mode, power_mode); /* set we want notice of when 74 clocks are sent */ tmp = readw(host->ioaddr + SD_CE_ATA_2); tmp |= SDCE_MISC_INT_EN; writew(tmp, host->ioaddr + SD_CE_ATA_2); /* start sending the 74 clocks */ tmp = readw(host->ioaddr + SD_CFG_FIFO_PARAM); tmp |= SDCFG_GEN_PAD_CLK_ON; writew(tmp, host->ioaddr + SD_CFG_FIFO_PARAM); /* slowest speed is about 100KHz or 10usec per clock */ udelay(740); count = 0; while (count++ < MAX_WAIT_COUNT) { if ((readw(host->ioaddr + SD_CE_ATA_2) & SDCE_MISC_INT) == 0) break; udelay(10); } if (count == MAX_WAIT_COUNT) dev_warn(mmc_dev(host->mmc), "74 clock interrupt not cleared\n"); /* clear the interrupt bit if posted */ tmp = readw(host->ioaddr + SD_CE_ATA_2); tmp |= SDCE_MISC_INT; writew(tmp, host->ioaddr + SD_CE_ATA_2); } pxa->power_mode = power_mode; } static int pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs) { u16 ctrl_2; /* * Set V18_EN -- UHS modes do not work without this. * does not change signaling voltage */ ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); /* Select Bus Speed Mode for host */ ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; switch (uhs) { case MMC_TIMING_UHS_SDR12: ctrl_2 |= SDHCI_CTRL_UHS_SDR12; break; case MMC_TIMING_UHS_SDR25: ctrl_2 |= SDHCI_CTRL_UHS_SDR25; break; case MMC_TIMING_UHS_SDR50: ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180; break; case MMC_TIMING_UHS_SDR104: ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180; break; case MMC_TIMING_UHS_DDR50: ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180; break; } sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); dev_dbg(mmc_dev(host->mmc), "%s uhs = %d, ctrl_2 = %04X\n", __func__, uhs, ctrl_2); return 0; } static struct sdhci_ops pxav3_sdhci_ops = { .platform_reset_exit = pxav3_set_private_registers, .set_uhs_signaling = pxav3_set_uhs_signaling, .platform_send_init_74_clocks = pxav3_gen_init_74_clocks, }; #ifdef CONFIG_OF static const struct of_device_id sdhci_pxav3_of_match[] = { { .compatible = "mrvl,pxav3-mmc", }, {}, }; MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match); static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev) { struct sdhci_pxa_platdata *pdata; struct device_node *np = dev->of_node; u32 bus_width; u32 clk_delay_cycles; enum of_gpio_flags gpio_flags; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return NULL; if (of_find_property(np, "non-removable", NULL)) pdata->flags |= PXA_FLAG_CARD_PERMANENT; of_property_read_u32(np, "bus-width", &bus_width); if (bus_width == 8) pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT; of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles); if (clk_delay_cycles > 0) pdata->clk_delay_cycles = clk_delay_cycles; pdata->ext_cd_gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &gpio_flags); if (gpio_flags != OF_GPIO_ACTIVE_LOW) pdata->host_caps2 |= MMC_CAP2_CD_ACTIVE_HIGH; return pdata; } #else static inline struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev) { return NULL; } #endif static int sdhci_pxav3_probe(struct platform_device *pdev) { struct sdhci_pltfm_host *pltfm_host; struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; struct device *dev = &pdev->dev; struct sdhci_host *host = NULL; struct sdhci_pxa *pxa = NULL; const struct of_device_id *match; int ret; struct clk *clk; pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL); if (!pxa) return -ENOMEM; host = sdhci_pltfm_init(pdev, NULL); if (IS_ERR(host)) { kfree(pxa); return PTR_ERR(host); } pltfm_host = sdhci_priv(host); pltfm_host->priv = pxa; clk = clk_get(dev, NULL); if (IS_ERR(clk)) { dev_err(dev, "failed to get io clock\n"); ret = PTR_ERR(clk); goto err_clk_get; } pltfm_host->clk = clk; clk_prepare_enable(clk); host->quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | SDHCI_QUIRK_32BIT_ADMA_SIZE; /* enable 1/8V DDR capable */ host->mmc->caps |= MMC_CAP_1_8V_DDR; match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev); if (match) pdata = pxav3_get_mmc_pdata(dev); if (pdata) { if (pdata->flags & PXA_FLAG_CARD_PERMANENT) { /* on-chip device */ host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; host->mmc->caps |= MMC_CAP_NONREMOVABLE; } /* If slot design supports 8 bit data, indicate this to MMC. */ if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT) host->mmc->caps |= MMC_CAP_8_BIT_DATA; if (pdata->quirks) host->quirks |= pdata->quirks; if (pdata->host_caps) host->mmc->caps |= pdata->host_caps; if (pdata->host_caps2) host->mmc->caps2 |= pdata->host_caps2; if (pdata->pm_caps) host->mmc->pm_caps |= pdata->pm_caps; if (gpio_is_valid(pdata->ext_cd_gpio)) { ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio); if (ret) { dev_err(mmc_dev(host->mmc), "failed to allocate card detect gpio\n"); goto err_cd_req; } } } host->ops = &pxav3_sdhci_ops; sdhci_get_of_property(pdev); ret = sdhci_add_host(host); if (ret) { dev_err(&pdev->dev, "failed to add host\n"); goto err_add_host; } platform_set_drvdata(pdev, host); return 0; err_add_host: clk_disable_unprepare(clk); clk_put(clk); mmc_gpio_free_cd(host->mmc); err_cd_req: err_clk_get: sdhci_pltfm_free(pdev); kfree(pxa); return ret; } static int __devexit sdhci_pxav3_remove(struct platform_device *pdev) { struct sdhci_host *host = platform_get_drvdata(pdev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_pxa *pxa = pltfm_host->priv; struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; sdhci_remove_host(host, 1); clk_disable_unprepare(pltfm_host->clk); clk_put(pltfm_host->clk); if (gpio_is_valid(pdata->ext_cd_gpio)) mmc_gpio_free_cd(host->mmc); sdhci_pltfm_free(pdev); kfree(pxa); platform_set_drvdata(pdev, NULL); return 0; } static struct platform_driver sdhci_pxav3_driver = { .driver = { .name = "sdhci-pxav3", #ifdef CONFIG_OF .of_match_table = sdhci_pxav3_of_match, #endif .owner = THIS_MODULE, .pm = SDHCI_PLTFM_PMOPS, }, .probe = sdhci_pxav3_probe, .remove = sdhci_pxav3_remove, }; module_platform_driver(sdhci_pxav3_driver); MODULE_DESCRIPTION("SDHCI driver for pxav3"); MODULE_AUTHOR("Marvell International Ltd."); MODULE_LICENSE("GPL v2");