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 static struct sdhci_ops sdhci_pltfm_ops = { 40 }; 41 42 #ifdef CONFIG_OF 43 static bool sdhci_of_wp_inverted(struct device_node *np) 44 { 45 if (of_get_property(np, "sdhci,wp-inverted", NULL) || 46 of_get_property(np, "wp-inverted", NULL)) 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 void sdhci_get_of_property(struct platform_device *pdev) 58 { 59 struct device_node *np = pdev->dev.of_node; 60 struct sdhci_host *host = platform_get_drvdata(pdev); 61 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 62 const __be32 *clk; 63 u32 bus_width; 64 int size; 65 66 if (of_device_is_available(np)) { 67 if (of_get_property(np, "sdhci,auto-cmd12", NULL)) 68 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 69 70 if (of_get_property(np, "sdhci,1-bit-only", NULL) || 71 (of_property_read_u32(np, "bus-width", &bus_width) == 0 && 72 bus_width == 1)) 73 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 74 75 if (sdhci_of_wp_inverted(np)) 76 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 77 78 if (of_get_property(np, "broken-cd", NULL)) 79 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 80 81 if (of_get_property(np, "no-1-8-v", NULL)) 82 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; 83 84 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 85 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 86 87 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 88 of_device_is_compatible(np, "fsl,p1010-esdhc") || 89 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 90 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 91 92 clk = of_get_property(np, "clock-frequency", &size); 93 if (clk && size == sizeof(*clk) && *clk) 94 pltfm_host->clock = be32_to_cpup(clk); 95 96 if (of_find_property(np, "keep-power-in-suspend", NULL)) 97 host->mmc->pm_caps |= MMC_PM_KEEP_POWER; 98 99 if (of_find_property(np, "enable-sdio-wakeup", NULL)) 100 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 101 } 102 } 103 #else 104 void sdhci_get_of_property(struct platform_device *pdev) {} 105 #endif /* CONFIG_OF */ 106 EXPORT_SYMBOL_GPL(sdhci_get_of_property); 107 108 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 109 struct sdhci_pltfm_data *pdata) 110 { 111 struct sdhci_host *host; 112 struct sdhci_pltfm_host *pltfm_host; 113 struct device_node *np = pdev->dev.of_node; 114 struct resource *iomem; 115 int ret; 116 117 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 118 if (!iomem) { 119 ret = -ENOMEM; 120 goto err; 121 } 122 123 if (resource_size(iomem) < 0x100) 124 dev_err(&pdev->dev, "Invalid iomem size!\n"); 125 126 /* Some PCI-based MFD need the parent here */ 127 if (pdev->dev.parent != &platform_bus && !np) 128 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host)); 129 else 130 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host)); 131 132 if (IS_ERR(host)) { 133 ret = PTR_ERR(host); 134 goto err; 135 } 136 137 pltfm_host = sdhci_priv(host); 138 139 host->hw_name = dev_name(&pdev->dev); 140 if (pdata && pdata->ops) 141 host->ops = pdata->ops; 142 else 143 host->ops = &sdhci_pltfm_ops; 144 if (pdata) 145 host->quirks = pdata->quirks; 146 host->irq = platform_get_irq(pdev, 0); 147 148 if (!request_mem_region(iomem->start, resource_size(iomem), 149 mmc_hostname(host->mmc))) { 150 dev_err(&pdev->dev, "cannot request region\n"); 151 ret = -EBUSY; 152 goto err_request; 153 } 154 155 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 156 if (!host->ioaddr) { 157 dev_err(&pdev->dev, "failed to remap registers\n"); 158 ret = -ENOMEM; 159 goto err_remap; 160 } 161 162 /* 163 * Some platforms need to probe the controller to be able to 164 * determine which caps should be used. 165 */ 166 if (host->ops && host->ops->platform_init) 167 host->ops->platform_init(host); 168 169 platform_set_drvdata(pdev, host); 170 171 return host; 172 173 err_remap: 174 release_mem_region(iomem->start, resource_size(iomem)); 175 err_request: 176 sdhci_free_host(host); 177 err: 178 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 179 return ERR_PTR(ret); 180 } 181 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 182 183 void sdhci_pltfm_free(struct platform_device *pdev) 184 { 185 struct sdhci_host *host = platform_get_drvdata(pdev); 186 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 187 188 iounmap(host->ioaddr); 189 release_mem_region(iomem->start, resource_size(iomem)); 190 sdhci_free_host(host); 191 platform_set_drvdata(pdev, NULL); 192 } 193 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 194 195 int sdhci_pltfm_register(struct platform_device *pdev, 196 struct sdhci_pltfm_data *pdata) 197 { 198 struct sdhci_host *host; 199 int ret = 0; 200 201 host = sdhci_pltfm_init(pdev, pdata); 202 if (IS_ERR(host)) 203 return PTR_ERR(host); 204 205 sdhci_get_of_property(pdev); 206 207 ret = sdhci_add_host(host); 208 if (ret) 209 sdhci_pltfm_free(pdev); 210 211 return ret; 212 } 213 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 214 215 int sdhci_pltfm_unregister(struct platform_device *pdev) 216 { 217 struct sdhci_host *host = platform_get_drvdata(pdev); 218 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 219 220 sdhci_remove_host(host, dead); 221 sdhci_pltfm_free(pdev); 222 223 return 0; 224 } 225 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 226 227 #ifdef CONFIG_PM 228 static int sdhci_pltfm_suspend(struct device *dev) 229 { 230 struct sdhci_host *host = dev_get_drvdata(dev); 231 232 return sdhci_suspend_host(host); 233 } 234 235 static int sdhci_pltfm_resume(struct device *dev) 236 { 237 struct sdhci_host *host = dev_get_drvdata(dev); 238 239 return sdhci_resume_host(host); 240 } 241 242 const struct dev_pm_ops sdhci_pltfm_pmops = { 243 .suspend = sdhci_pltfm_suspend, 244 .resume = sdhci_pltfm_resume, 245 }; 246 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 247 #endif /* CONFIG_PM */ 248 249 static int __init sdhci_pltfm_drv_init(void) 250 { 251 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 252 253 return 0; 254 } 255 module_init(sdhci_pltfm_drv_init); 256 257 static void __exit sdhci_pltfm_drv_exit(void) 258 { 259 } 260 module_exit(sdhci_pltfm_drv_exit); 261 262 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 263 MODULE_AUTHOR("Intel Corporation"); 264 MODULE_LICENSE("GPL v2"); 265