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 static void sdhci_get_compatibility(struct platform_device *pdev) 58 { 59 struct sdhci_host *host = platform_get_drvdata(pdev); 60 struct device_node *np = pdev->dev.of_node; 61 62 if (!np) 63 return; 64 65 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 66 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 67 68 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 69 of_device_is_compatible(np, "fsl,p1010-esdhc") || 70 of_device_is_compatible(np, "fsl,t4240-esdhc") || 71 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 72 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 73 } 74 75 void sdhci_get_property(struct platform_device *pdev) 76 { 77 struct device *dev = &pdev->dev; 78 struct sdhci_host *host = platform_get_drvdata(pdev); 79 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 80 u32 bus_width; 81 82 if (device_property_present(dev, "sdhci,auto-cmd12")) 83 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 84 85 if (device_property_present(dev, "sdhci,1-bit-only") || 86 (device_property_read_u32(dev, "bus-width", &bus_width) == 0 && 87 bus_width == 1)) 88 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 89 90 if (sdhci_wp_inverted(dev)) 91 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 92 93 if (device_property_present(dev, "broken-cd")) 94 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 95 96 if (device_property_present(dev, "no-1-8-v")) 97 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; 98 99 sdhci_get_compatibility(pdev); 100 101 device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock); 102 103 if (device_property_present(dev, "keep-power-in-suspend")) 104 host->mmc->pm_caps |= MMC_PM_KEEP_POWER; 105 106 if (device_property_read_bool(dev, "wakeup-source") || 107 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */ 108 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 109 } 110 EXPORT_SYMBOL_GPL(sdhci_get_property); 111 112 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 113 const struct sdhci_pltfm_data *pdata, 114 size_t priv_size) 115 { 116 struct sdhci_host *host; 117 void __iomem *ioaddr; 118 int irq, ret; 119 120 ioaddr = devm_platform_ioremap_resource(pdev, 0); 121 if (IS_ERR(ioaddr)) { 122 ret = PTR_ERR(ioaddr); 123 goto err; 124 } 125 126 irq = platform_get_irq(pdev, 0); 127 if (irq < 0) { 128 ret = irq; 129 goto err; 130 } 131 132 host = sdhci_alloc_host(&pdev->dev, 133 sizeof(struct sdhci_pltfm_host) + priv_size); 134 135 if (IS_ERR(host)) { 136 ret = PTR_ERR(host); 137 goto err; 138 } 139 140 host->ioaddr = ioaddr; 141 host->irq = irq; 142 host->hw_name = dev_name(&pdev->dev); 143 if (pdata && pdata->ops) 144 host->ops = pdata->ops; 145 else 146 host->ops = &sdhci_pltfm_ops; 147 if (pdata) { 148 host->quirks = pdata->quirks; 149 host->quirks2 = pdata->quirks2; 150 } 151 152 platform_set_drvdata(pdev, host); 153 154 return host; 155 err: 156 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 157 return ERR_PTR(ret); 158 } 159 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 160 161 void sdhci_pltfm_free(struct platform_device *pdev) 162 { 163 struct sdhci_host *host = platform_get_drvdata(pdev); 164 165 sdhci_free_host(host); 166 } 167 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 168 169 int sdhci_pltfm_register(struct platform_device *pdev, 170 const struct sdhci_pltfm_data *pdata, 171 size_t priv_size) 172 { 173 struct sdhci_host *host; 174 int ret = 0; 175 176 host = sdhci_pltfm_init(pdev, pdata, priv_size); 177 if (IS_ERR(host)) 178 return PTR_ERR(host); 179 180 sdhci_get_property(pdev); 181 182 ret = sdhci_add_host(host); 183 if (ret) 184 sdhci_pltfm_free(pdev); 185 186 return ret; 187 } 188 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 189 190 int sdhci_pltfm_unregister(struct platform_device *pdev) 191 { 192 struct sdhci_host *host = platform_get_drvdata(pdev); 193 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 194 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 195 196 sdhci_remove_host(host, dead); 197 clk_disable_unprepare(pltfm_host->clk); 198 sdhci_pltfm_free(pdev); 199 200 return 0; 201 } 202 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 203 204 #ifdef CONFIG_PM_SLEEP 205 int sdhci_pltfm_suspend(struct device *dev) 206 { 207 struct sdhci_host *host = dev_get_drvdata(dev); 208 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 209 int ret; 210 211 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 212 mmc_retune_needed(host->mmc); 213 214 ret = sdhci_suspend_host(host); 215 if (ret) 216 return ret; 217 218 clk_disable_unprepare(pltfm_host->clk); 219 220 return 0; 221 } 222 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 223 224 int sdhci_pltfm_resume(struct device *dev) 225 { 226 struct sdhci_host *host = dev_get_drvdata(dev); 227 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 228 int ret; 229 230 ret = clk_prepare_enable(pltfm_host->clk); 231 if (ret) 232 return ret; 233 234 ret = sdhci_resume_host(host); 235 if (ret) 236 clk_disable_unprepare(pltfm_host->clk); 237 238 return ret; 239 } 240 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 241 #endif 242 243 const struct dev_pm_ops sdhci_pltfm_pmops = { 244 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume) 245 }; 246 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 247 248 static int __init sdhci_pltfm_drv_init(void) 249 { 250 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 251 252 return 0; 253 } 254 module_init(sdhci_pltfm_drv_init); 255 256 static void __exit sdhci_pltfm_drv_exit(void) 257 { 258 } 259 module_exit(sdhci_pltfm_drv_exit); 260 261 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 262 MODULE_AUTHOR("Intel Corporation"); 263 MODULE_LICENSE("GPL v2"); 264