1 /* 2 * sdhci-pltfm.c Support for SDHCI platform devices 3 * Copyright (c) 2009 Intel Corporation 4 * 5 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc. 6 * Copyright (c) 2009 MontaVista Software, Inc. 7 * 8 * Authors: Xiaobo Xie <X.Xie@freescale.com> 9 * Anton Vorontsov <avorontsov@ru.mvista.com> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 23 */ 24 25 /* Supports: 26 * SDHCI platform devices 27 * 28 * Inspired by sdhci-pci.c, by Pierre Ossman 29 */ 30 31 #include <linux/err.h> 32 #include <linux/module.h> 33 #include <linux/property.h> 34 #include <linux/of.h> 35 #ifdef CONFIG_PPC 36 #include <asm/machdep.h> 37 #endif 38 #include "sdhci-pltfm.h" 39 40 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host) 41 { 42 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 43 44 return clk_get_rate(pltfm_host->clk); 45 } 46 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock); 47 48 static const struct sdhci_ops sdhci_pltfm_ops = { 49 .set_clock = sdhci_set_clock, 50 .set_bus_width = sdhci_set_bus_width, 51 .reset = sdhci_reset, 52 .set_uhs_signaling = sdhci_set_uhs_signaling, 53 }; 54 55 static bool sdhci_wp_inverted(struct device *dev) 56 { 57 if (device_property_present(dev, "sdhci,wp-inverted") || 58 device_property_present(dev, "wp-inverted")) 59 return true; 60 61 /* Old device trees don't have the wp-inverted property. */ 62 #ifdef CONFIG_PPC 63 return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds); 64 #else 65 return false; 66 #endif /* CONFIG_PPC */ 67 } 68 69 #ifdef CONFIG_OF 70 static void sdhci_get_compatibility(struct platform_device *pdev) 71 { 72 struct sdhci_host *host = platform_get_drvdata(pdev); 73 struct device_node *np = pdev->dev.of_node; 74 75 if (!np) 76 return; 77 78 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 79 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 80 81 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 82 of_device_is_compatible(np, "fsl,p1010-esdhc") || 83 of_device_is_compatible(np, "fsl,t4240-esdhc") || 84 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 85 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 86 } 87 #else 88 void sdhci_get_compatibility(struct platform_device *pdev) {} 89 #endif /* CONFIG_OF */ 90 91 void sdhci_get_property(struct platform_device *pdev) 92 { 93 struct device *dev = &pdev->dev; 94 struct sdhci_host *host = platform_get_drvdata(pdev); 95 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 96 u32 bus_width; 97 98 if (device_property_present(dev, "sdhci,auto-cmd12")) 99 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 100 101 if (device_property_present(dev, "sdhci,1-bit-only") || 102 (device_property_read_u32(dev, "bus-width", &bus_width) == 0 && 103 bus_width == 1)) 104 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 105 106 if (sdhci_wp_inverted(dev)) 107 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 108 109 if (device_property_present(dev, "broken-cd")) 110 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 111 112 if (device_property_present(dev, "no-1-8-v")) 113 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; 114 115 sdhci_get_compatibility(pdev); 116 117 device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock); 118 119 if (device_property_present(dev, "keep-power-in-suspend")) 120 host->mmc->pm_caps |= MMC_PM_KEEP_POWER; 121 122 if (device_property_read_bool(dev, "wakeup-source") || 123 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */ 124 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 125 } 126 EXPORT_SYMBOL_GPL(sdhci_get_property); 127 128 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 129 const struct sdhci_pltfm_data *pdata, 130 size_t priv_size) 131 { 132 struct sdhci_host *host; 133 struct resource *iomem; 134 void __iomem *ioaddr; 135 int irq, ret; 136 137 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 138 ioaddr = devm_ioremap_resource(&pdev->dev, iomem); 139 if (IS_ERR(ioaddr)) { 140 ret = PTR_ERR(ioaddr); 141 goto err; 142 } 143 144 irq = platform_get_irq(pdev, 0); 145 if (irq < 0) { 146 dev_err(&pdev->dev, "failed to get IRQ number\n"); 147 ret = irq; 148 goto err; 149 } 150 151 host = sdhci_alloc_host(&pdev->dev, 152 sizeof(struct sdhci_pltfm_host) + priv_size); 153 154 if (IS_ERR(host)) { 155 ret = PTR_ERR(host); 156 goto err; 157 } 158 159 host->ioaddr = ioaddr; 160 host->irq = irq; 161 host->hw_name = dev_name(&pdev->dev); 162 if (pdata && pdata->ops) 163 host->ops = pdata->ops; 164 else 165 host->ops = &sdhci_pltfm_ops; 166 if (pdata) { 167 host->quirks = pdata->quirks; 168 host->quirks2 = pdata->quirks2; 169 } 170 171 platform_set_drvdata(pdev, host); 172 173 return host; 174 err: 175 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 176 return ERR_PTR(ret); 177 } 178 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 179 180 void sdhci_pltfm_free(struct platform_device *pdev) 181 { 182 struct sdhci_host *host = platform_get_drvdata(pdev); 183 184 sdhci_free_host(host); 185 } 186 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 187 188 int sdhci_pltfm_register(struct platform_device *pdev, 189 const struct sdhci_pltfm_data *pdata, 190 size_t priv_size) 191 { 192 struct sdhci_host *host; 193 int ret = 0; 194 195 host = sdhci_pltfm_init(pdev, pdata, priv_size); 196 if (IS_ERR(host)) 197 return PTR_ERR(host); 198 199 sdhci_get_property(pdev); 200 201 ret = sdhci_add_host(host); 202 if (ret) 203 sdhci_pltfm_free(pdev); 204 205 return ret; 206 } 207 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 208 209 int sdhci_pltfm_unregister(struct platform_device *pdev) 210 { 211 struct sdhci_host *host = platform_get_drvdata(pdev); 212 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 213 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 214 215 sdhci_remove_host(host, dead); 216 clk_disable_unprepare(pltfm_host->clk); 217 sdhci_pltfm_free(pdev); 218 219 return 0; 220 } 221 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 222 223 #ifdef CONFIG_PM_SLEEP 224 int sdhci_pltfm_suspend(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 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 231 mmc_retune_needed(host->mmc); 232 233 ret = sdhci_suspend_host(host); 234 if (ret) 235 return ret; 236 237 clk_disable_unprepare(pltfm_host->clk); 238 239 return 0; 240 } 241 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 242 243 int sdhci_pltfm_resume(struct device *dev) 244 { 245 struct sdhci_host *host = dev_get_drvdata(dev); 246 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 247 int ret; 248 249 ret = clk_prepare_enable(pltfm_host->clk); 250 if (ret) 251 return ret; 252 253 ret = sdhci_resume_host(host); 254 if (ret) 255 clk_disable_unprepare(pltfm_host->clk); 256 257 return ret; 258 } 259 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 260 #endif 261 262 const struct dev_pm_ops sdhci_pltfm_pmops = { 263 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume) 264 }; 265 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 266 267 static int __init sdhci_pltfm_drv_init(void) 268 { 269 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 270 271 return 0; 272 } 273 module_init(sdhci_pltfm_drv_init); 274 275 static void __exit sdhci_pltfm_drv_exit(void) 276 { 277 } 278 module_exit(sdhci_pltfm_drv_exit); 279 280 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 281 MODULE_AUTHOR("Intel Corporation"); 282 MODULE_LICENSE("GPL v2"); 283