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 #include <linux/of.h> 23 #ifdef CONFIG_PPC 24 #include <asm/machdep.h> 25 #endif 26 #include "sdhci-pltfm.h" 27 28 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host) 29 { 30 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 31 32 return clk_get_rate(pltfm_host->clk); 33 } 34 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock); 35 36 static const struct sdhci_ops sdhci_pltfm_ops = { 37 .set_clock = sdhci_set_clock, 38 .set_bus_width = sdhci_set_bus_width, 39 .reset = sdhci_reset, 40 .set_uhs_signaling = sdhci_set_uhs_signaling, 41 }; 42 43 static bool sdhci_wp_inverted(struct device *dev) 44 { 45 if (device_property_present(dev, "sdhci,wp-inverted") || 46 device_property_present(dev, "wp-inverted")) 47 return true; 48 49 /* Old device trees don't have the wp-inverted property. */ 50 #ifdef CONFIG_PPC 51 return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds); 52 #else 53 return false; 54 #endif /* CONFIG_PPC */ 55 } 56 57 #ifdef CONFIG_OF 58 static void sdhci_get_compatibility(struct platform_device *pdev) 59 { 60 struct sdhci_host *host = platform_get_drvdata(pdev); 61 struct device_node *np = pdev->dev.of_node; 62 63 if (!np) 64 return; 65 66 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 67 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 68 69 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 70 of_device_is_compatible(np, "fsl,p1010-esdhc") || 71 of_device_is_compatible(np, "fsl,t4240-esdhc") || 72 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 73 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 74 } 75 #else 76 void sdhci_get_compatibility(struct platform_device *pdev) {} 77 #endif /* CONFIG_OF */ 78 79 void sdhci_get_property(struct platform_device *pdev) 80 { 81 struct device *dev = &pdev->dev; 82 struct sdhci_host *host = platform_get_drvdata(pdev); 83 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 84 u32 bus_width; 85 86 if (device_property_present(dev, "sdhci,auto-cmd12")) 87 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 88 89 if (device_property_present(dev, "sdhci,1-bit-only") || 90 (device_property_read_u32(dev, "bus-width", &bus_width) == 0 && 91 bus_width == 1)) 92 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 93 94 if (sdhci_wp_inverted(dev)) 95 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 96 97 if (device_property_present(dev, "broken-cd")) 98 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 99 100 if (device_property_present(dev, "no-1-8-v")) 101 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; 102 103 sdhci_get_compatibility(pdev); 104 105 device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock); 106 107 if (device_property_present(dev, "keep-power-in-suspend")) 108 host->mmc->pm_caps |= MMC_PM_KEEP_POWER; 109 110 if (device_property_read_bool(dev, "wakeup-source") || 111 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */ 112 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 113 } 114 EXPORT_SYMBOL_GPL(sdhci_get_property); 115 116 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 117 const struct sdhci_pltfm_data *pdata, 118 size_t priv_size) 119 { 120 struct sdhci_host *host; 121 void __iomem *ioaddr; 122 int irq, ret; 123 124 ioaddr = devm_platform_ioremap_resource(pdev, 0); 125 if (IS_ERR(ioaddr)) { 126 ret = PTR_ERR(ioaddr); 127 goto err; 128 } 129 130 irq = platform_get_irq(pdev, 0); 131 if (irq < 0) { 132 ret = irq; 133 goto err; 134 } 135 136 host = sdhci_alloc_host(&pdev->dev, 137 sizeof(struct sdhci_pltfm_host) + priv_size); 138 139 if (IS_ERR(host)) { 140 ret = PTR_ERR(host); 141 goto err; 142 } 143 144 host->ioaddr = ioaddr; 145 host->irq = irq; 146 host->hw_name = dev_name(&pdev->dev); 147 if (pdata && pdata->ops) 148 host->ops = pdata->ops; 149 else 150 host->ops = &sdhci_pltfm_ops; 151 if (pdata) { 152 host->quirks = pdata->quirks; 153 host->quirks2 = pdata->quirks2; 154 } 155 156 platform_set_drvdata(pdev, host); 157 158 return host; 159 err: 160 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 161 return ERR_PTR(ret); 162 } 163 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 164 165 void sdhci_pltfm_free(struct platform_device *pdev) 166 { 167 struct sdhci_host *host = platform_get_drvdata(pdev); 168 169 sdhci_free_host(host); 170 } 171 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 172 173 int sdhci_pltfm_register(struct platform_device *pdev, 174 const struct sdhci_pltfm_data *pdata, 175 size_t priv_size) 176 { 177 struct sdhci_host *host; 178 int ret = 0; 179 180 host = sdhci_pltfm_init(pdev, pdata, priv_size); 181 if (IS_ERR(host)) 182 return PTR_ERR(host); 183 184 sdhci_get_property(pdev); 185 186 ret = sdhci_add_host(host); 187 if (ret) 188 sdhci_pltfm_free(pdev); 189 190 return ret; 191 } 192 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 193 194 int sdhci_pltfm_unregister(struct platform_device *pdev) 195 { 196 struct sdhci_host *host = platform_get_drvdata(pdev); 197 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 198 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 199 200 sdhci_remove_host(host, dead); 201 clk_disable_unprepare(pltfm_host->clk); 202 sdhci_pltfm_free(pdev); 203 204 return 0; 205 } 206 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 207 208 #ifdef CONFIG_PM_SLEEP 209 int sdhci_pltfm_suspend(struct device *dev) 210 { 211 struct sdhci_host *host = dev_get_drvdata(dev); 212 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 213 int ret; 214 215 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 216 mmc_retune_needed(host->mmc); 217 218 ret = sdhci_suspend_host(host); 219 if (ret) 220 return ret; 221 222 clk_disable_unprepare(pltfm_host->clk); 223 224 return 0; 225 } 226 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 227 228 int sdhci_pltfm_resume(struct device *dev) 229 { 230 struct sdhci_host *host = dev_get_drvdata(dev); 231 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 232 int ret; 233 234 ret = clk_prepare_enable(pltfm_host->clk); 235 if (ret) 236 return ret; 237 238 ret = sdhci_resume_host(host); 239 if (ret) 240 clk_disable_unprepare(pltfm_host->clk); 241 242 return ret; 243 } 244 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 245 #endif 246 247 const struct dev_pm_ops sdhci_pltfm_pmops = { 248 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume) 249 }; 250 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 251 252 static int __init sdhci_pltfm_drv_init(void) 253 { 254 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 255 256 return 0; 257 } 258 module_init(sdhci_pltfm_drv_init); 259 260 static void __exit sdhci_pltfm_drv_exit(void) 261 { 262 } 263 module_exit(sdhci_pltfm_drv_exit); 264 265 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 266 MODULE_AUTHOR("Intel Corporation"); 267 MODULE_LICENSE("GPL v2"); 268