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path: root/drivers/mmc/host/sdhci-pltfm.c
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Diffstat (limited to 'drivers/mmc/host/sdhci-pltfm.c')
-rw-r--r--drivers/mmc/host/sdhci-pltfm.c267
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");