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 if (device_property_present(dev, "keep-power-in-suspend")) 100 host->mmc->pm_caps |= MMC_PM_KEEP_POWER; 101 102 if (device_property_read_bool(dev, "wakeup-source") || 103 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */ 104 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 105 } 106 EXPORT_SYMBOL_GPL(sdhci_get_property); 107 108 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 109 const struct sdhci_pltfm_data *pdata, 110 size_t priv_size) 111 { 112 struct sdhci_host *host; 113 void __iomem *ioaddr; 114 int irq; 115 116 ioaddr = devm_platform_ioremap_resource(pdev, 0); 117 if (IS_ERR(ioaddr)) 118 return ERR_CAST(ioaddr); 119 120 irq = platform_get_irq(pdev, 0); 121 if (irq < 0) 122 return ERR_PTR(irq); 123 124 host = sdhci_alloc_host(&pdev->dev, 125 sizeof(struct sdhci_pltfm_host) + priv_size); 126 if (IS_ERR(host)) { 127 dev_err(&pdev->dev, "%s failed %pe\n", __func__, host); 128 return ERR_CAST(host); 129 } 130 131 host->ioaddr = ioaddr; 132 host->irq = irq; 133 host->hw_name = dev_name(&pdev->dev); 134 if (pdata && pdata->ops) 135 host->ops = pdata->ops; 136 else 137 host->ops = &sdhci_pltfm_ops; 138 if (pdata) { 139 host->quirks = pdata->quirks; 140 host->quirks2 = pdata->quirks2; 141 } 142 143 platform_set_drvdata(pdev, host); 144 145 return host; 146 } 147 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 148 149 void sdhci_pltfm_free(struct platform_device *pdev) 150 { 151 struct sdhci_host *host = platform_get_drvdata(pdev); 152 153 sdhci_free_host(host); 154 } 155 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 156 157 int sdhci_pltfm_init_and_add_host(struct platform_device *pdev, 158 const struct sdhci_pltfm_data *pdata, 159 size_t priv_size) 160 { 161 struct sdhci_host *host; 162 int ret = 0; 163 164 host = sdhci_pltfm_init(pdev, pdata, priv_size); 165 if (IS_ERR(host)) 166 return PTR_ERR(host); 167 168 sdhci_get_property(pdev); 169 170 ret = sdhci_add_host(host); 171 if (ret) 172 sdhci_pltfm_free(pdev); 173 174 return ret; 175 } 176 EXPORT_SYMBOL_GPL(sdhci_pltfm_init_and_add_host); 177 178 void sdhci_pltfm_remove(struct platform_device *pdev) 179 { 180 struct sdhci_host *host = platform_get_drvdata(pdev); 181 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 182 183 sdhci_remove_host(host, dead); 184 sdhci_pltfm_free(pdev); 185 } 186 EXPORT_SYMBOL_GPL(sdhci_pltfm_remove); 187 188 #ifdef CONFIG_PM_SLEEP 189 int sdhci_pltfm_suspend(struct device *dev) 190 { 191 struct sdhci_host *host = dev_get_drvdata(dev); 192 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 193 int ret; 194 195 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 196 mmc_retune_needed(host->mmc); 197 198 ret = sdhci_suspend_host(host); 199 if (ret) 200 return ret; 201 202 clk_disable_unprepare(pltfm_host->clk); 203 204 return 0; 205 } 206 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 207 208 int sdhci_pltfm_resume(struct device *dev) 209 { 210 struct sdhci_host *host = dev_get_drvdata(dev); 211 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 212 int ret; 213 214 ret = clk_prepare_enable(pltfm_host->clk); 215 if (ret) 216 return ret; 217 218 ret = sdhci_resume_host(host); 219 if (ret) 220 clk_disable_unprepare(pltfm_host->clk); 221 222 return ret; 223 } 224 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 225 #endif 226 227 const struct dev_pm_ops sdhci_pltfm_pmops = { 228 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume) 229 }; 230 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 231 232 static int __init sdhci_pltfm_drv_init(void) 233 { 234 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 235 236 return 0; 237 } 238 module_init(sdhci_pltfm_drv_init); 239 240 static void __exit sdhci_pltfm_drv_exit(void) 241 { 242 } 243 module_exit(sdhci_pltfm_drv_exit); 244 245 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 246 MODULE_AUTHOR("Intel Corporation"); 247 MODULE_LICENSE("GPL v2"); 248