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_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 82 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 83 84 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 85 of_device_is_compatible(np, "fsl,p1010-esdhc") || 86 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 87 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 88 89 clk = of_get_property(np, "clock-frequency", &size); 90 if (clk && size == sizeof(*clk) && *clk) 91 pltfm_host->clock = be32_to_cpup(clk); 92 } 93 } 94 #else 95 void sdhci_get_of_property(struct platform_device *pdev) {} 96 #endif /* CONFIG_OF */ 97 EXPORT_SYMBOL_GPL(sdhci_get_of_property); 98 99 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 100 struct sdhci_pltfm_data *pdata) 101 { 102 struct sdhci_host *host; 103 struct sdhci_pltfm_host *pltfm_host; 104 struct device_node *np = pdev->dev.of_node; 105 struct resource *iomem; 106 int ret; 107 108 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 109 if (!iomem) { 110 ret = -ENOMEM; 111 goto err; 112 } 113 114 if (resource_size(iomem) < 0x100) 115 dev_err(&pdev->dev, "Invalid iomem size!\n"); 116 117 /* Some PCI-based MFD need the parent here */ 118 if (pdev->dev.parent != &platform_bus && !np) 119 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host)); 120 else 121 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host)); 122 123 if (IS_ERR(host)) { 124 ret = PTR_ERR(host); 125 goto err; 126 } 127 128 pltfm_host = sdhci_priv(host); 129 130 host->hw_name = dev_name(&pdev->dev); 131 if (pdata && pdata->ops) 132 host->ops = pdata->ops; 133 else 134 host->ops = &sdhci_pltfm_ops; 135 if (pdata) 136 host->quirks = pdata->quirks; 137 host->irq = platform_get_irq(pdev, 0); 138 139 if (!request_mem_region(iomem->start, resource_size(iomem), 140 mmc_hostname(host->mmc))) { 141 dev_err(&pdev->dev, "cannot request region\n"); 142 ret = -EBUSY; 143 goto err_request; 144 } 145 146 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 147 if (!host->ioaddr) { 148 dev_err(&pdev->dev, "failed to remap registers\n"); 149 ret = -ENOMEM; 150 goto err_remap; 151 } 152 153 /* 154 * Some platforms need to probe the controller to be able to 155 * determine which caps should be used. 156 */ 157 if (host->ops && host->ops->platform_init) 158 host->ops->platform_init(host); 159 160 platform_set_drvdata(pdev, host); 161 162 return host; 163 164 err_remap: 165 release_mem_region(iomem->start, resource_size(iomem)); 166 err_request: 167 sdhci_free_host(host); 168 err: 169 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 170 return ERR_PTR(ret); 171 } 172 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 173 174 void sdhci_pltfm_free(struct platform_device *pdev) 175 { 176 struct sdhci_host *host = platform_get_drvdata(pdev); 177 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 178 179 iounmap(host->ioaddr); 180 release_mem_region(iomem->start, resource_size(iomem)); 181 sdhci_free_host(host); 182 platform_set_drvdata(pdev, NULL); 183 } 184 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 185 186 int sdhci_pltfm_register(struct platform_device *pdev, 187 struct sdhci_pltfm_data *pdata) 188 { 189 struct sdhci_host *host; 190 int ret = 0; 191 192 host = sdhci_pltfm_init(pdev, pdata); 193 if (IS_ERR(host)) 194 return PTR_ERR(host); 195 196 sdhci_get_of_property(pdev); 197 198 ret = sdhci_add_host(host); 199 if (ret) 200 sdhci_pltfm_free(pdev); 201 202 return ret; 203 } 204 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 205 206 int sdhci_pltfm_unregister(struct platform_device *pdev) 207 { 208 struct sdhci_host *host = platform_get_drvdata(pdev); 209 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 210 211 sdhci_remove_host(host, dead); 212 sdhci_pltfm_free(pdev); 213 214 return 0; 215 } 216 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 217 218 #ifdef CONFIG_PM 219 static int sdhci_pltfm_suspend(struct device *dev) 220 { 221 struct sdhci_host *host = dev_get_drvdata(dev); 222 223 return sdhci_suspend_host(host); 224 } 225 226 static int sdhci_pltfm_resume(struct device *dev) 227 { 228 struct sdhci_host *host = dev_get_drvdata(dev); 229 230 return sdhci_resume_host(host); 231 } 232 233 const struct dev_pm_ops sdhci_pltfm_pmops = { 234 .suspend = sdhci_pltfm_suspend, 235 .resume = sdhci_pltfm_resume, 236 }; 237 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 238 #endif /* CONFIG_PM */ 239 240 static int __init sdhci_pltfm_drv_init(void) 241 { 242 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 243 244 return 0; 245 } 246 module_init(sdhci_pltfm_drv_init); 247 248 static void __exit sdhci_pltfm_drv_exit(void) 249 { 250 } 251 module_exit(sdhci_pltfm_drv_exit); 252 253 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 254 MODULE_AUTHOR("Intel Corporation"); 255 MODULE_LICENSE("GPL v2"); 256