diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/mmc/host/sdhci-pltfm.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c new file mode 100644 index 000000000..328b132bb --- /dev/null +++ b/drivers/mmc/host/sdhci-pltfm.c @@ -0,0 +1,267 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * sdhci-pltfm.c Support for SDHCI platform devices + * Copyright (c) 2009 Intel Corporation + * + * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc. + * Copyright (c) 2009 MontaVista Software, Inc. + * + * Authors: Xiaobo Xie <X.Xie@freescale.com> + * Anton Vorontsov <avorontsov@ru.mvista.com> + */ + +/* Supports: + * SDHCI platform devices + * + * Inspired by sdhci-pci.c, by Pierre Ossman + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/property.h> +#include <linux/of.h> +#ifdef CONFIG_PPC +#include <asm/machdep.h> +#endif +#include "sdhci-pltfm.h" + +unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + return clk_get_rate(pltfm_host->clk); +} +EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock); + +static const struct sdhci_ops sdhci_pltfm_ops = { + .set_clock = sdhci_set_clock, + .set_bus_width = sdhci_set_bus_width, + .reset = sdhci_reset, + .set_uhs_signaling = sdhci_set_uhs_signaling, +}; + +static bool sdhci_wp_inverted(struct device *dev) +{ + if (device_property_present(dev, "sdhci,wp-inverted") || + device_property_present(dev, "wp-inverted")) + return true; + + /* Old device trees don't have the wp-inverted property. */ +#ifdef CONFIG_PPC + return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds); +#else + return false; +#endif /* CONFIG_PPC */ +} + +#ifdef CONFIG_OF +static void sdhci_get_compatibility(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + struct device_node *np = pdev->dev.of_node; + + if (!np) + return; + + if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) + host->quirks |= SDHCI_QUIRK_BROKEN_DMA; + + if (of_device_is_compatible(np, "fsl,p2020-esdhc") || + of_device_is_compatible(np, "fsl,p1010-esdhc") || + of_device_is_compatible(np, "fsl,t4240-esdhc") || + of_device_is_compatible(np, "fsl,mpc8536-esdhc")) + host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; +} +#else +void sdhci_get_compatibility(struct platform_device *pdev) {} +#endif /* CONFIG_OF */ + +void sdhci_get_property(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + u32 bus_width; + + if (device_property_present(dev, "sdhci,auto-cmd12")) + host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; + + if (device_property_present(dev, "sdhci,1-bit-only") || + (device_property_read_u32(dev, "bus-width", &bus_width) == 0 && + bus_width == 1)) + host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; + + if (sdhci_wp_inverted(dev)) + host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; + + if (device_property_present(dev, "broken-cd")) + host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; + + if (device_property_present(dev, "no-1-8-v")) + host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; + + sdhci_get_compatibility(pdev); + + device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock); + + if (device_property_present(dev, "keep-power-in-suspend")) + host->mmc->pm_caps |= MMC_PM_KEEP_POWER; + + if (device_property_read_bool(dev, "wakeup-source") || + device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */ + host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; +} +EXPORT_SYMBOL_GPL(sdhci_get_property); + +struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, + const struct sdhci_pltfm_data *pdata, + size_t priv_size) +{ + struct sdhci_host *host; + void __iomem *ioaddr; + int irq, ret; + + ioaddr = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(ioaddr)) { + ret = PTR_ERR(ioaddr); + goto err; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto err; + } + + host = sdhci_alloc_host(&pdev->dev, + sizeof(struct sdhci_pltfm_host) + priv_size); + + if (IS_ERR(host)) { + ret = PTR_ERR(host); + goto err; + } + + host->ioaddr = ioaddr; + host->irq = irq; + host->hw_name = dev_name(&pdev->dev); + if (pdata && pdata->ops) + host->ops = pdata->ops; + else + host->ops = &sdhci_pltfm_ops; + if (pdata) { + host->quirks = pdata->quirks; + host->quirks2 = pdata->quirks2; + } + + platform_set_drvdata(pdev, host); + + return host; +err: + dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(sdhci_pltfm_init); + +void sdhci_pltfm_free(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + + sdhci_free_host(host); +} +EXPORT_SYMBOL_GPL(sdhci_pltfm_free); + +int sdhci_pltfm_register(struct platform_device *pdev, + const struct sdhci_pltfm_data *pdata, + size_t priv_size) +{ + struct sdhci_host *host; + int ret = 0; + + host = sdhci_pltfm_init(pdev, pdata, priv_size); + if (IS_ERR(host)) + return PTR_ERR(host); + + sdhci_get_property(pdev); + + ret = sdhci_add_host(host); + if (ret) + sdhci_pltfm_free(pdev); + + return ret; +} +EXPORT_SYMBOL_GPL(sdhci_pltfm_register); + +int sdhci_pltfm_unregister(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); + + sdhci_remove_host(host, dead); + clk_disable_unprepare(pltfm_host->clk); + sdhci_pltfm_free(pdev); + + return 0; +} +EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); + +#ifdef CONFIG_PM_SLEEP +int sdhci_pltfm_suspend(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + int ret; + + if (host->tuning_mode != SDHCI_TUNING_MODE_3) + mmc_retune_needed(host->mmc); + + ret = sdhci_suspend_host(host); + if (ret) + return ret; + + clk_disable_unprepare(pltfm_host->clk); + + return 0; +} +EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); + +int sdhci_pltfm_resume(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + int ret; + + ret = clk_prepare_enable(pltfm_host->clk); + if (ret) + return ret; + + ret = sdhci_resume_host(host); + if (ret) + clk_disable_unprepare(pltfm_host->clk); + + return ret; +} +EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); +#endif + +const struct dev_pm_ops sdhci_pltfm_pmops = { + SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume) +}; +EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); + +static int __init sdhci_pltfm_drv_init(void) +{ + pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); + + return 0; +} +module_init(sdhci_pltfm_drv_init); + +static void __exit sdhci_pltfm_drv_exit(void) +{ +} +module_exit(sdhci_pltfm_drv_exit); + +MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL v2"); |