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_find_property(np, "enable-sdio-wakeup", NULL)) 108 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 109 } 110 #else 111 void sdhci_get_of_property(struct platform_device *pdev) {} 112 #endif /* CONFIG_OF */ 113 EXPORT_SYMBOL_GPL(sdhci_get_of_property); 114 115 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 116 const struct sdhci_pltfm_data *pdata, 117 size_t priv_size) 118 { 119 struct sdhci_host *host; 120 struct resource *iomem; 121 int ret; 122 123 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 124 if (!iomem) { 125 ret = -ENOMEM; 126 goto err; 127 } 128 129 if (resource_size(iomem) < 0x100) 130 dev_err(&pdev->dev, "Invalid iomem size!\n"); 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->hw_name = dev_name(&pdev->dev); 141 if (pdata && pdata->ops) 142 host->ops = pdata->ops; 143 else 144 host->ops = &sdhci_pltfm_ops; 145 if (pdata) { 146 host->quirks = pdata->quirks; 147 host->quirks2 = pdata->quirks2; 148 } 149 150 host->irq = platform_get_irq(pdev, 0); 151 152 if (!request_mem_region(iomem->start, resource_size(iomem), 153 mmc_hostname(host->mmc))) { 154 dev_err(&pdev->dev, "cannot request region\n"); 155 ret = -EBUSY; 156 goto err_request; 157 } 158 159 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 160 if (!host->ioaddr) { 161 dev_err(&pdev->dev, "failed to remap registers\n"); 162 ret = -ENOMEM; 163 goto err_remap; 164 } 165 166 /* 167 * Some platforms need to probe the controller to be able to 168 * determine which caps should be used. 169 */ 170 if (host->ops && host->ops->platform_init) 171 host->ops->platform_init(host); 172 173 platform_set_drvdata(pdev, host); 174 175 return host; 176 177 err_remap: 178 release_mem_region(iomem->start, resource_size(iomem)); 179 err_request: 180 sdhci_free_host(host); 181 err: 182 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 183 return ERR_PTR(ret); 184 } 185 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 186 187 void sdhci_pltfm_free(struct platform_device *pdev) 188 { 189 struct sdhci_host *host = platform_get_drvdata(pdev); 190 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 191 192 iounmap(host->ioaddr); 193 release_mem_region(iomem->start, resource_size(iomem)); 194 sdhci_free_host(host); 195 } 196 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 197 198 int sdhci_pltfm_register(struct platform_device *pdev, 199 const struct sdhci_pltfm_data *pdata, 200 size_t priv_size) 201 { 202 struct sdhci_host *host; 203 int ret = 0; 204 205 host = sdhci_pltfm_init(pdev, pdata, priv_size); 206 if (IS_ERR(host)) 207 return PTR_ERR(host); 208 209 sdhci_get_of_property(pdev); 210 211 ret = sdhci_add_host(host); 212 if (ret) 213 sdhci_pltfm_free(pdev); 214 215 return ret; 216 } 217 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 218 219 int sdhci_pltfm_unregister(struct platform_device *pdev) 220 { 221 struct sdhci_host *host = platform_get_drvdata(pdev); 222 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 223 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 224 225 sdhci_remove_host(host, dead); 226 clk_disable_unprepare(pltfm_host->clk); 227 sdhci_pltfm_free(pdev); 228 229 return 0; 230 } 231 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 232 233 #ifdef CONFIG_PM 234 int sdhci_pltfm_suspend(struct device *dev) 235 { 236 struct sdhci_host *host = dev_get_drvdata(dev); 237 238 return sdhci_suspend_host(host); 239 } 240 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 241 242 int sdhci_pltfm_resume(struct device *dev) 243 { 244 struct sdhci_host *host = dev_get_drvdata(dev); 245 246 return sdhci_resume_host(host); 247 } 248 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 249 250 const struct dev_pm_ops sdhci_pltfm_pmops = { 251 .suspend = sdhci_pltfm_suspend, 252 .resume = sdhci_pltfm_resume, 253 }; 254 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 255 #endif /* CONFIG_PM */ 256 257 static int __init sdhci_pltfm_drv_init(void) 258 { 259 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 260 261 return 0; 262 } 263 module_init(sdhci_pltfm_drv_init); 264 265 static void __exit sdhci_pltfm_drv_exit(void) 266 { 267 } 268 module_exit(sdhci_pltfm_drv_exit); 269 270 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 271 MODULE_AUTHOR("Intel Corporation"); 272 MODULE_LICENSE("GPL v2"); 273