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 const __be32 *clk; 75 u32 bus_width; 76 int size; 77 78 if (of_device_is_available(np)) { 79 if (of_get_property(np, "sdhci,auto-cmd12", NULL)) 80 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 81 82 if (of_get_property(np, "sdhci,1-bit-only", NULL) || 83 (of_property_read_u32(np, "bus-width", &bus_width) == 0 && 84 bus_width == 1)) 85 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 86 87 if (sdhci_of_wp_inverted(np)) 88 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 89 90 if (of_get_property(np, "broken-cd", NULL)) 91 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 92 93 if (of_get_property(np, "no-1-8-v", NULL)) 94 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; 95 96 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 97 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 98 99 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 100 of_device_is_compatible(np, "fsl,p1010-esdhc") || 101 of_device_is_compatible(np, "fsl,t4240-esdhc") || 102 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 103 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 104 105 clk = of_get_property(np, "clock-frequency", &size); 106 if (clk && size == sizeof(*clk) && *clk) 107 pltfm_host->clock = be32_to_cpup(clk); 108 109 if (of_find_property(np, "keep-power-in-suspend", NULL)) 110 host->mmc->pm_caps |= MMC_PM_KEEP_POWER; 111 112 if (of_find_property(np, "enable-sdio-wakeup", NULL)) 113 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 114 } 115 } 116 #else 117 void sdhci_get_of_property(struct platform_device *pdev) {} 118 #endif /* CONFIG_OF */ 119 EXPORT_SYMBOL_GPL(sdhci_get_of_property); 120 121 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 122 const struct sdhci_pltfm_data *pdata, 123 size_t priv_size) 124 { 125 struct sdhci_host *host; 126 struct resource *iomem; 127 int ret; 128 129 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 130 if (!iomem) { 131 ret = -ENOMEM; 132 goto err; 133 } 134 135 if (resource_size(iomem) < 0x100) 136 dev_err(&pdev->dev, "Invalid iomem size!\n"); 137 138 host = sdhci_alloc_host(&pdev->dev, 139 sizeof(struct sdhci_pltfm_host) + priv_size); 140 141 if (IS_ERR(host)) { 142 ret = PTR_ERR(host); 143 goto err; 144 } 145 146 host->hw_name = dev_name(&pdev->dev); 147 if (pdata && pdata->ops) 148 host->ops = pdata->ops; 149 else 150 host->ops = &sdhci_pltfm_ops; 151 if (pdata) { 152 host->quirks = pdata->quirks; 153 host->quirks2 = pdata->quirks2; 154 } 155 156 host->irq = platform_get_irq(pdev, 0); 157 158 if (!request_mem_region(iomem->start, resource_size(iomem), 159 mmc_hostname(host->mmc))) { 160 dev_err(&pdev->dev, "cannot request region\n"); 161 ret = -EBUSY; 162 goto err_request; 163 } 164 165 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 166 if (!host->ioaddr) { 167 dev_err(&pdev->dev, "failed to remap registers\n"); 168 ret = -ENOMEM; 169 goto err_remap; 170 } 171 172 /* 173 * Some platforms need to probe the controller to be able to 174 * determine which caps should be used. 175 */ 176 if (host->ops && host->ops->platform_init) 177 host->ops->platform_init(host); 178 179 platform_set_drvdata(pdev, host); 180 181 return host; 182 183 err_remap: 184 release_mem_region(iomem->start, resource_size(iomem)); 185 err_request: 186 sdhci_free_host(host); 187 err: 188 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 189 return ERR_PTR(ret); 190 } 191 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 192 193 void sdhci_pltfm_free(struct platform_device *pdev) 194 { 195 struct sdhci_host *host = platform_get_drvdata(pdev); 196 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 197 198 iounmap(host->ioaddr); 199 release_mem_region(iomem->start, resource_size(iomem)); 200 sdhci_free_host(host); 201 } 202 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 203 204 int sdhci_pltfm_register(struct platform_device *pdev, 205 const struct sdhci_pltfm_data *pdata, 206 size_t priv_size) 207 { 208 struct sdhci_host *host; 209 int ret = 0; 210 211 host = sdhci_pltfm_init(pdev, pdata, priv_size); 212 if (IS_ERR(host)) 213 return PTR_ERR(host); 214 215 sdhci_get_of_property(pdev); 216 217 ret = sdhci_add_host(host); 218 if (ret) 219 sdhci_pltfm_free(pdev); 220 221 return ret; 222 } 223 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 224 225 int sdhci_pltfm_unregister(struct platform_device *pdev) 226 { 227 struct sdhci_host *host = platform_get_drvdata(pdev); 228 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 229 230 sdhci_remove_host(host, dead); 231 sdhci_pltfm_free(pdev); 232 233 return 0; 234 } 235 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 236 237 #ifdef CONFIG_PM 238 int sdhci_pltfm_suspend(struct device *dev) 239 { 240 struct sdhci_host *host = dev_get_drvdata(dev); 241 242 return sdhci_suspend_host(host); 243 } 244 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 245 246 int sdhci_pltfm_resume(struct device *dev) 247 { 248 struct sdhci_host *host = dev_get_drvdata(dev); 249 250 return sdhci_resume_host(host); 251 } 252 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 253 254 const struct dev_pm_ops sdhci_pltfm_pmops = { 255 .suspend = sdhci_pltfm_suspend, 256 .resume = sdhci_pltfm_resume, 257 }; 258 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 259 #endif /* CONFIG_PM */ 260 261 static int __init sdhci_pltfm_drv_init(void) 262 { 263 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 264 265 return 0; 266 } 267 module_init(sdhci_pltfm_drv_init); 268 269 static void __exit sdhci_pltfm_drv_exit(void) 270 { 271 } 272 module_exit(sdhci_pltfm_drv_exit); 273 274 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 275 MODULE_AUTHOR("Intel Corporation"); 276 MODULE_LICENSE("GPL v2"); 277