1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sdhci-pltfm.c Support for SDHCI platform devices 4 * Copyright (c) 2009 Intel Corporation 5 * 6 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc. 7 * Copyright (c) 2009 MontaVista Software, Inc. 8 * 9 * Authors: Xiaobo Xie <X.Xie@freescale.com> 10 * Anton Vorontsov <avorontsov@ru.mvista.com> 11 */ 12 13 /* Supports: 14 * SDHCI platform devices 15 * 16 * Inspired by sdhci-pci.c, by Pierre Ossman 17 */ 18 19 #include <linux/err.h> 20 #include <linux/module.h> 21 #include <linux/property.h> 22 #ifdef CONFIG_PPC 23 #include <asm/machdep.h> 24 #endif 25 #include "sdhci-pltfm.h" 26 27 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host) 28 { 29 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 30 31 return clk_get_rate(pltfm_host->clk); 32 } 33 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock); 34 35 static const struct sdhci_ops sdhci_pltfm_ops = { 36 .set_clock = sdhci_set_clock, 37 .set_bus_width = sdhci_set_bus_width, 38 .reset = sdhci_reset, 39 .set_uhs_signaling = sdhci_set_uhs_signaling, 40 }; 41 42 static bool sdhci_wp_inverted(struct device *dev) 43 { 44 if (device_property_present(dev, "sdhci,wp-inverted") || 45 device_property_present(dev, "wp-inverted")) 46 return true; 47 48 /* Old device trees don't have the wp-inverted property. */ 49 #ifdef CONFIG_PPC 50 return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds); 51 #else 52 return false; 53 #endif /* CONFIG_PPC */ 54 } 55 56 static void sdhci_get_compatibility(struct platform_device *pdev) 57 { 58 struct device *dev = &pdev->dev; 59 struct sdhci_host *host = platform_get_drvdata(pdev); 60 61 if (device_is_compatible(dev, "fsl,p2020-rev1-esdhc")) 62 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 63 64 if (device_is_compatible(dev, "fsl,p2020-esdhc") || 65 device_is_compatible(dev, "fsl,p1010-esdhc") || 66 device_is_compatible(dev, "fsl,t4240-esdhc") || 67 device_is_compatible(dev, "fsl,mpc8536-esdhc")) 68 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 69 } 70 71 void sdhci_get_property(struct platform_device *pdev) 72 { 73 struct device *dev = &pdev->dev; 74 struct sdhci_host *host = platform_get_drvdata(pdev); 75 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 76 u32 bus_width; 77 78 if (device_property_present(dev, "sdhci,auto-cmd12")) 79 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 80 81 if (device_property_present(dev, "sdhci,1-bit-only") || 82 (device_property_read_u32(dev, "bus-width", &bus_width) == 0 && 83 bus_width == 1)) 84 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 85 86 if (sdhci_wp_inverted(dev)) 87 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 88 89 if (device_property_present(dev, "broken-cd")) 90 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 91 92 if (device_property_present(dev, "no-1-8-v")) 93 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; 94 95 sdhci_get_compatibility(pdev); 96 97 device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock); 98 } 99 EXPORT_SYMBOL_GPL(sdhci_get_property); 100 101 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 102 const struct sdhci_pltfm_data *pdata, 103 size_t priv_size) 104 { 105 struct sdhci_host *host; 106 void __iomem *ioaddr; 107 int irq; 108 109 ioaddr = devm_platform_ioremap_resource(pdev, 0); 110 if (IS_ERR(ioaddr)) 111 return ERR_CAST(ioaddr); 112 113 irq = platform_get_irq(pdev, 0); 114 if (irq < 0) 115 return ERR_PTR(irq); 116 117 host = sdhci_alloc_host(&pdev->dev, 118 sizeof(struct sdhci_pltfm_host) + priv_size); 119 if (IS_ERR(host)) { 120 dev_err(&pdev->dev, "%s failed %pe\n", __func__, host); 121 return ERR_CAST(host); 122 } 123 124 host->ioaddr = ioaddr; 125 host->irq = irq; 126 host->hw_name = dev_name(&pdev->dev); 127 if (pdata && pdata->ops) 128 host->ops = pdata->ops; 129 else 130 host->ops = &sdhci_pltfm_ops; 131 if (pdata) { 132 host->quirks = pdata->quirks; 133 host->quirks2 = pdata->quirks2; 134 } 135 136 platform_set_drvdata(pdev, host); 137 138 return host; 139 } 140 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 141 142 int sdhci_pltfm_init_and_add_host(struct platform_device *pdev, 143 const struct sdhci_pltfm_data *pdata, 144 size_t priv_size) 145 { 146 struct sdhci_host *host; 147 148 host = sdhci_pltfm_init(pdev, pdata, priv_size); 149 if (IS_ERR(host)) 150 return PTR_ERR(host); 151 152 sdhci_get_property(pdev); 153 154 return sdhci_add_host(host); 155 } 156 EXPORT_SYMBOL_GPL(sdhci_pltfm_init_and_add_host); 157 158 void sdhci_pltfm_remove(struct platform_device *pdev) 159 { 160 struct sdhci_host *host = platform_get_drvdata(pdev); 161 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 162 163 sdhci_remove_host(host, dead); 164 } 165 EXPORT_SYMBOL_GPL(sdhci_pltfm_remove); 166 167 #ifdef CONFIG_PM_SLEEP 168 int sdhci_pltfm_suspend(struct device *dev) 169 { 170 struct sdhci_host *host = dev_get_drvdata(dev); 171 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 172 int ret; 173 174 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 175 mmc_retune_needed(host->mmc); 176 177 ret = sdhci_suspend_host(host); 178 if (ret) 179 return ret; 180 181 clk_disable_unprepare(pltfm_host->clk); 182 183 return 0; 184 } 185 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 186 187 int sdhci_pltfm_resume(struct device *dev) 188 { 189 struct sdhci_host *host = dev_get_drvdata(dev); 190 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 191 int ret; 192 193 ret = clk_prepare_enable(pltfm_host->clk); 194 if (ret) 195 return ret; 196 197 ret = sdhci_resume_host(host); 198 if (ret) 199 clk_disable_unprepare(pltfm_host->clk); 200 201 return ret; 202 } 203 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 204 #endif 205 206 const struct dev_pm_ops sdhci_pltfm_pmops = { 207 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume) 208 }; 209 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 210 211 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 212 MODULE_AUTHOR("Intel Corporation"); 213 MODULE_LICENSE("GPL v2"); 214