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/of.h> 34 #ifdef CONFIG_PPC 35 #include <asm/machdep.h> 36 #endif 37 #include "sdhci-pltfm.h" 38 39 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host) 40 { 41 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 42 43 return clk_get_rate(pltfm_host->clk); 44 } 45 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock); 46 47 static const struct sdhci_ops sdhci_pltfm_ops = { 48 .set_clock = sdhci_set_clock, 49 .set_bus_width = sdhci_set_bus_width, 50 .reset = sdhci_reset, 51 .set_uhs_signaling = sdhci_set_uhs_signaling, 52 }; 53 54 #ifdef CONFIG_OF 55 static bool sdhci_of_wp_inverted(struct device_node *np) 56 { 57 if (of_get_property(np, "sdhci,wp-inverted", NULL) || 58 of_get_property(np, "wp-inverted", NULL)) 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 void sdhci_get_of_property(struct platform_device *pdev) 70 { 71 struct device_node *np = pdev->dev.of_node; 72 struct sdhci_host *host = platform_get_drvdata(pdev); 73 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 74 u32 bus_width; 75 76 if (of_get_property(np, "sdhci,auto-cmd12", NULL)) 77 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 78 79 if (of_get_property(np, "sdhci,1-bit-only", NULL) || 80 (of_property_read_u32(np, "bus-width", &bus_width) == 0 && 81 bus_width == 1)) 82 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 83 84 if (sdhci_of_wp_inverted(np)) 85 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 86 87 if (of_get_property(np, "broken-cd", NULL)) 88 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 89 90 if (of_get_property(np, "no-1-8-v", NULL)) 91 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; 92 93 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 94 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 95 96 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 97 of_device_is_compatible(np, "fsl,p1010-esdhc") || 98 of_device_is_compatible(np, "fsl,t4240-esdhc") || 99 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 100 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 101 102 of_property_read_u32(np, "clock-frequency", &pltfm_host->clock); 103 104 if (of_find_property(np, "keep-power-in-suspend", NULL)) 105 host->mmc->pm_caps |= MMC_PM_KEEP_POWER; 106 107 if (of_property_read_bool(np, "wakeup-source") || 108 of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */ 109 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 110 } 111 #else 112 void sdhci_get_of_property(struct platform_device *pdev) {} 113 #endif /* CONFIG_OF */ 114 EXPORT_SYMBOL_GPL(sdhci_get_of_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 struct resource *iomem; 122 void __iomem *ioaddr; 123 int irq, ret; 124 125 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 126 ioaddr = devm_ioremap_resource(&pdev->dev, iomem); 127 if (IS_ERR(ioaddr)) { 128 ret = PTR_ERR(ioaddr); 129 goto err; 130 } 131 132 irq = platform_get_irq(pdev, 0); 133 if (irq < 0) { 134 dev_err(&pdev->dev, "failed to get IRQ number\n"); 135 ret = irq; 136 goto err; 137 } 138 139 host = sdhci_alloc_host(&pdev->dev, 140 sizeof(struct sdhci_pltfm_host) + priv_size); 141 142 if (IS_ERR(host)) { 143 ret = PTR_ERR(host); 144 goto err; 145 } 146 147 host->ioaddr = ioaddr; 148 host->irq = irq; 149 host->hw_name = dev_name(&pdev->dev); 150 if (pdata && pdata->ops) 151 host->ops = pdata->ops; 152 else 153 host->ops = &sdhci_pltfm_ops; 154 if (pdata) { 155 host->quirks = pdata->quirks; 156 host->quirks2 = pdata->quirks2; 157 } 158 159 platform_set_drvdata(pdev, host); 160 161 return host; 162 err: 163 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 164 return ERR_PTR(ret); 165 } 166 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 167 168 void sdhci_pltfm_free(struct platform_device *pdev) 169 { 170 struct sdhci_host *host = platform_get_drvdata(pdev); 171 172 sdhci_free_host(host); 173 } 174 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 175 176 int sdhci_pltfm_register(struct platform_device *pdev, 177 const struct sdhci_pltfm_data *pdata, 178 size_t priv_size) 179 { 180 struct sdhci_host *host; 181 int ret = 0; 182 183 host = sdhci_pltfm_init(pdev, pdata, priv_size); 184 if (IS_ERR(host)) 185 return PTR_ERR(host); 186 187 sdhci_get_of_property(pdev); 188 189 ret = sdhci_add_host(host); 190 if (ret) 191 sdhci_pltfm_free(pdev); 192 193 return ret; 194 } 195 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 196 197 int sdhci_pltfm_unregister(struct platform_device *pdev) 198 { 199 struct sdhci_host *host = platform_get_drvdata(pdev); 200 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 201 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 202 203 sdhci_remove_host(host, dead); 204 clk_disable_unprepare(pltfm_host->clk); 205 sdhci_pltfm_free(pdev); 206 207 return 0; 208 } 209 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 210 211 #ifdef CONFIG_PM_SLEEP 212 int sdhci_pltfm_suspend(struct device *dev) 213 { 214 struct sdhci_host *host = dev_get_drvdata(dev); 215 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 216 int ret; 217 218 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 219 mmc_retune_needed(host->mmc); 220 221 ret = sdhci_suspend_host(host); 222 if (ret) 223 return ret; 224 225 clk_disable_unprepare(pltfm_host->clk); 226 227 return 0; 228 } 229 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 230 231 int sdhci_pltfm_resume(struct device *dev) 232 { 233 struct sdhci_host *host = dev_get_drvdata(dev); 234 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 235 int ret; 236 237 ret = clk_prepare_enable(pltfm_host->clk); 238 if (ret) 239 return ret; 240 241 ret = sdhci_resume_host(host); 242 if (ret) 243 clk_disable_unprepare(pltfm_host->clk); 244 245 return ret; 246 } 247 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 248 #endif 249 250 const struct dev_pm_ops sdhci_pltfm_pmops = { 251 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume) 252 }; 253 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 254 255 static int __init sdhci_pltfm_drv_init(void) 256 { 257 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 258 259 return 0; 260 } 261 module_init(sdhci_pltfm_drv_init); 262 263 static void __exit sdhci_pltfm_drv_exit(void) 264 { 265 } 266 module_exit(sdhci_pltfm_drv_exit); 267 268 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 269 MODULE_AUTHOR("Intel Corporation"); 270 MODULE_LICENSE("GPL v2"); 271