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 return true; 47 48 /* Old device trees don't have the wp-inverted property. */ 49 #ifdef CONFIG_PPC 50 return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds); 51 #else 52 return false; 53 #endif /* CONFIG_PPC */ 54 } 55 56 void sdhci_get_of_property(struct platform_device *pdev) 57 { 58 struct device_node *np = pdev->dev.of_node; 59 struct sdhci_host *host = platform_get_drvdata(pdev); 60 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 61 const __be32 *clk; 62 int size; 63 64 if (of_device_is_available(np)) { 65 if (of_get_property(np, "sdhci,auto-cmd12", NULL)) 66 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; 67 68 if (of_get_property(np, "sdhci,1-bit-only", NULL)) 69 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; 70 71 if (sdhci_of_wp_inverted(np)) 72 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; 73 74 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 75 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 76 77 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 78 of_device_is_compatible(np, "fsl,p1010-esdhc") || 79 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 80 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 81 82 clk = of_get_property(np, "clock-frequency", &size); 83 if (clk && size == sizeof(*clk) && *clk) 84 pltfm_host->clock = be32_to_cpup(clk); 85 } 86 } 87 #else 88 void sdhci_get_of_property(struct platform_device *pdev) {} 89 #endif /* CONFIG_OF */ 90 EXPORT_SYMBOL_GPL(sdhci_get_of_property); 91 92 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 93 struct sdhci_pltfm_data *pdata) 94 { 95 struct sdhci_host *host; 96 struct sdhci_pltfm_host *pltfm_host; 97 struct device_node *np = pdev->dev.of_node; 98 struct resource *iomem; 99 int ret; 100 101 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 102 if (!iomem) { 103 ret = -ENOMEM; 104 goto err; 105 } 106 107 if (resource_size(iomem) < 0x100) 108 dev_err(&pdev->dev, "Invalid iomem size!\n"); 109 110 /* Some PCI-based MFD need the parent here */ 111 if (pdev->dev.parent != &platform_bus && !np) 112 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host)); 113 else 114 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host)); 115 116 if (IS_ERR(host)) { 117 ret = PTR_ERR(host); 118 goto err; 119 } 120 121 pltfm_host = sdhci_priv(host); 122 123 host->hw_name = dev_name(&pdev->dev); 124 if (pdata && pdata->ops) 125 host->ops = pdata->ops; 126 else 127 host->ops = &sdhci_pltfm_ops; 128 if (pdata) 129 host->quirks = pdata->quirks; 130 host->irq = platform_get_irq(pdev, 0); 131 132 if (!request_mem_region(iomem->start, resource_size(iomem), 133 mmc_hostname(host->mmc))) { 134 dev_err(&pdev->dev, "cannot request region\n"); 135 ret = -EBUSY; 136 goto err_request; 137 } 138 139 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 140 if (!host->ioaddr) { 141 dev_err(&pdev->dev, "failed to remap registers\n"); 142 ret = -ENOMEM; 143 goto err_remap; 144 } 145 146 platform_set_drvdata(pdev, host); 147 148 return host; 149 150 err_remap: 151 release_mem_region(iomem->start, resource_size(iomem)); 152 err_request: 153 sdhci_free_host(host); 154 err: 155 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 156 return ERR_PTR(ret); 157 } 158 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 159 160 void sdhci_pltfm_free(struct platform_device *pdev) 161 { 162 struct sdhci_host *host = platform_get_drvdata(pdev); 163 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 164 165 iounmap(host->ioaddr); 166 release_mem_region(iomem->start, resource_size(iomem)); 167 sdhci_free_host(host); 168 platform_set_drvdata(pdev, NULL); 169 } 170 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 171 172 int sdhci_pltfm_register(struct platform_device *pdev, 173 struct sdhci_pltfm_data *pdata) 174 { 175 struct sdhci_host *host; 176 int ret = 0; 177 178 host = sdhci_pltfm_init(pdev, pdata); 179 if (IS_ERR(host)) 180 return PTR_ERR(host); 181 182 sdhci_get_of_property(pdev); 183 184 ret = sdhci_add_host(host); 185 if (ret) 186 sdhci_pltfm_free(pdev); 187 188 return ret; 189 } 190 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 191 192 int sdhci_pltfm_unregister(struct platform_device *pdev) 193 { 194 struct sdhci_host *host = platform_get_drvdata(pdev); 195 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 196 197 sdhci_remove_host(host, dead); 198 sdhci_pltfm_free(pdev); 199 200 return 0; 201 } 202 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 203 204 #ifdef CONFIG_PM 205 static int sdhci_pltfm_suspend(struct device *dev) 206 { 207 struct sdhci_host *host = dev_get_drvdata(dev); 208 209 return sdhci_suspend_host(host); 210 } 211 212 static int sdhci_pltfm_resume(struct device *dev) 213 { 214 struct sdhci_host *host = dev_get_drvdata(dev); 215 216 return sdhci_resume_host(host); 217 } 218 219 const struct dev_pm_ops sdhci_pltfm_pmops = { 220 .suspend = sdhci_pltfm_suspend, 221 .resume = sdhci_pltfm_resume, 222 }; 223 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 224 #endif /* CONFIG_PM */ 225 226 static int __init sdhci_pltfm_drv_init(void) 227 { 228 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 229 230 return 0; 231 } 232 module_init(sdhci_pltfm_drv_init); 233 234 static void __exit sdhci_pltfm_drv_exit(void) 235 { 236 } 237 module_exit(sdhci_pltfm_drv_exit); 238 239 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 240 MODULE_AUTHOR("Intel Corporation"); 241 MODULE_LICENSE("GPL v2"); 242