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 }; 49 50 #ifdef CONFIG_OF 51 static bool sdhci_of_wp_inverted(struct device_node *np) 52 { 53 if (of_get_property(np, "sdhci,wp-inverted", NULL) || 54 of_get_property(np, "wp-inverted", NULL)) 55 return true; 56 57 /* Old device trees don't have the wp-inverted property. */ 58 #ifdef CONFIG_PPC 59 return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds); 60 #else 61 return false; 62 #endif /* CONFIG_PPC */ 63 } 64 65 void sdhci_get_of_property(struct platform_device *pdev) 66 { 67 struct device_node *np = pdev->dev.of_node; 68 struct sdhci_host *host = platform_get_drvdata(pdev); 69 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 70 const __be32 *clk; 71 u32 bus_width; 72 int size; 73 74 if (of_device_is_available(np)) { 75 if (of_get_property(np, "sdhci,auto-cmd12", NULL)) 76 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 77 78 if (of_get_property(np, "sdhci,1-bit-only", NULL) || 79 (of_property_read_u32(np, "bus-width", &bus_width) == 0 && 80 bus_width == 1)) 81 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 82 83 if (sdhci_of_wp_inverted(np)) 84 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 85 86 if (of_get_property(np, "broken-cd", NULL)) 87 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; 88 89 if (of_get_property(np, "no-1-8-v", NULL)) 90 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; 91 92 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 93 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 94 95 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 96 of_device_is_compatible(np, "fsl,p1010-esdhc") || 97 of_device_is_compatible(np, "fsl,t4240-esdhc") || 98 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 99 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 100 101 clk = of_get_property(np, "clock-frequency", &size); 102 if (clk && size == sizeof(*clk) && *clk) 103 pltfm_host->clock = be32_to_cpup(clk); 104 105 if (of_find_property(np, "keep-power-in-suspend", NULL)) 106 host->mmc->pm_caps |= MMC_PM_KEEP_POWER; 107 108 if (of_find_property(np, "enable-sdio-wakeup", NULL)) 109 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; 110 } 111 } 112 #else 113 void sdhci_get_of_property(struct platform_device *pdev) {} 114 #endif /* CONFIG_OF */ 115 EXPORT_SYMBOL_GPL(sdhci_get_of_property); 116 117 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 118 const struct sdhci_pltfm_data *pdata) 119 { 120 struct sdhci_host *host; 121 struct sdhci_pltfm_host *pltfm_host; 122 struct device_node *np = pdev->dev.of_node; 123 struct resource *iomem; 124 int ret; 125 126 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 127 if (!iomem) { 128 ret = -ENOMEM; 129 goto err; 130 } 131 132 if (resource_size(iomem) < 0x100) 133 dev_err(&pdev->dev, "Invalid iomem size!\n"); 134 135 /* Some PCI-based MFD need the parent here */ 136 if (pdev->dev.parent != &platform_bus && !np) 137 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host)); 138 else 139 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host)); 140 141 if (IS_ERR(host)) { 142 ret = PTR_ERR(host); 143 goto err; 144 } 145 146 pltfm_host = sdhci_priv(host); 147 148 host->hw_name = dev_name(&pdev->dev); 149 if (pdata && pdata->ops) 150 host->ops = pdata->ops; 151 else 152 host->ops = &sdhci_pltfm_ops; 153 if (pdata) 154 host->quirks = pdata->quirks; 155 host->irq = platform_get_irq(pdev, 0); 156 157 if (!request_mem_region(iomem->start, resource_size(iomem), 158 mmc_hostname(host->mmc))) { 159 dev_err(&pdev->dev, "cannot request region\n"); 160 ret = -EBUSY; 161 goto err_request; 162 } 163 164 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 165 if (!host->ioaddr) { 166 dev_err(&pdev->dev, "failed to remap registers\n"); 167 ret = -ENOMEM; 168 goto err_remap; 169 } 170 171 /* 172 * Some platforms need to probe the controller to be able to 173 * determine which caps should be used. 174 */ 175 if (host->ops && host->ops->platform_init) 176 host->ops->platform_init(host); 177 178 platform_set_drvdata(pdev, host); 179 180 return host; 181 182 err_remap: 183 release_mem_region(iomem->start, resource_size(iomem)); 184 err_request: 185 sdhci_free_host(host); 186 err: 187 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 188 return ERR_PTR(ret); 189 } 190 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 191 192 void sdhci_pltfm_free(struct platform_device *pdev) 193 { 194 struct sdhci_host *host = platform_get_drvdata(pdev); 195 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 196 197 iounmap(host->ioaddr); 198 release_mem_region(iomem->start, resource_size(iomem)); 199 sdhci_free_host(host); 200 platform_set_drvdata(pdev, NULL); 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 { 207 struct sdhci_host *host; 208 int ret = 0; 209 210 host = sdhci_pltfm_init(pdev, pdata); 211 if (IS_ERR(host)) 212 return PTR_ERR(host); 213 214 sdhci_get_of_property(pdev); 215 216 ret = sdhci_add_host(host); 217 if (ret) 218 sdhci_pltfm_free(pdev); 219 220 return ret; 221 } 222 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 223 224 int sdhci_pltfm_unregister(struct platform_device *pdev) 225 { 226 struct sdhci_host *host = platform_get_drvdata(pdev); 227 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 228 229 sdhci_remove_host(host, dead); 230 sdhci_pltfm_free(pdev); 231 232 return 0; 233 } 234 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 235 236 #ifdef CONFIG_PM 237 static int sdhci_pltfm_suspend(struct device *dev) 238 { 239 struct sdhci_host *host = dev_get_drvdata(dev); 240 241 return sdhci_suspend_host(host); 242 } 243 244 static int sdhci_pltfm_resume(struct device *dev) 245 { 246 struct sdhci_host *host = dev_get_drvdata(dev); 247 248 return sdhci_resume_host(host); 249 } 250 251 const struct dev_pm_ops sdhci_pltfm_pmops = { 252 .suspend = sdhci_pltfm_suspend, 253 .resume = sdhci_pltfm_resume, 254 }; 255 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 256 #endif /* CONFIG_PM */ 257 258 static int __init sdhci_pltfm_drv_init(void) 259 { 260 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 261 262 return 0; 263 } 264 module_init(sdhci_pltfm_drv_init); 265 266 static void __exit sdhci_pltfm_drv_exit(void) 267 { 268 } 269 module_exit(sdhci_pltfm_drv_exit); 270 271 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 272 MODULE_AUTHOR("Intel Corporation"); 273 MODULE_LICENSE("GPL v2"); 274