1 /* 2 * sdhci-pltfm.c Support for SDHCI platform devices 3 * Copyright (c) 2009 Intel Corporation 4 * 5 * Copyright (c) 2007 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 clk = of_get_property(np, "clock-frequency", &size); 75 if (clk && size == sizeof(*clk) && *clk) 76 pltfm_host->clock = be32_to_cpup(clk); 77 } 78 } 79 #else 80 void sdhci_get_of_property(struct platform_device *pdev) {} 81 #endif /* CONFIG_OF */ 82 EXPORT_SYMBOL_GPL(sdhci_get_of_property); 83 84 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 85 struct sdhci_pltfm_data *pdata) 86 { 87 struct sdhci_host *host; 88 struct sdhci_pltfm_host *pltfm_host; 89 struct device_node *np = pdev->dev.of_node; 90 struct resource *iomem; 91 int ret; 92 93 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 94 if (!iomem) { 95 ret = -ENOMEM; 96 goto err; 97 } 98 99 if (resource_size(iomem) < 0x100) 100 dev_err(&pdev->dev, "Invalid iomem size!\n"); 101 102 /* Some PCI-based MFD need the parent here */ 103 if (pdev->dev.parent != &platform_bus && !np) 104 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host)); 105 else 106 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host)); 107 108 if (IS_ERR(host)) { 109 ret = PTR_ERR(host); 110 goto err; 111 } 112 113 pltfm_host = sdhci_priv(host); 114 115 host->hw_name = dev_name(&pdev->dev); 116 if (pdata && pdata->ops) 117 host->ops = pdata->ops; 118 else 119 host->ops = &sdhci_pltfm_ops; 120 if (pdata) 121 host->quirks = pdata->quirks; 122 host->irq = platform_get_irq(pdev, 0); 123 124 if (!request_mem_region(iomem->start, resource_size(iomem), 125 mmc_hostname(host->mmc))) { 126 dev_err(&pdev->dev, "cannot request region\n"); 127 ret = -EBUSY; 128 goto err_request; 129 } 130 131 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 132 if (!host->ioaddr) { 133 dev_err(&pdev->dev, "failed to remap registers\n"); 134 ret = -ENOMEM; 135 goto err_remap; 136 } 137 138 platform_set_drvdata(pdev, host); 139 140 return host; 141 142 err_remap: 143 release_mem_region(iomem->start, resource_size(iomem)); 144 err_request: 145 sdhci_free_host(host); 146 err: 147 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 148 return ERR_PTR(ret); 149 } 150 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 151 152 void sdhci_pltfm_free(struct platform_device *pdev) 153 { 154 struct sdhci_host *host = platform_get_drvdata(pdev); 155 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 156 157 iounmap(host->ioaddr); 158 release_mem_region(iomem->start, resource_size(iomem)); 159 sdhci_free_host(host); 160 platform_set_drvdata(pdev, NULL); 161 } 162 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 163 164 int sdhci_pltfm_register(struct platform_device *pdev, 165 struct sdhci_pltfm_data *pdata) 166 { 167 struct sdhci_host *host; 168 int ret = 0; 169 170 host = sdhci_pltfm_init(pdev, pdata); 171 if (IS_ERR(host)) 172 return PTR_ERR(host); 173 174 sdhci_get_of_property(pdev); 175 176 ret = sdhci_add_host(host); 177 if (ret) 178 sdhci_pltfm_free(pdev); 179 180 return ret; 181 } 182 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 183 184 int sdhci_pltfm_unregister(struct platform_device *pdev) 185 { 186 struct sdhci_host *host = platform_get_drvdata(pdev); 187 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 188 189 sdhci_remove_host(host, dead); 190 sdhci_pltfm_free(pdev); 191 192 return 0; 193 } 194 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 195 196 #ifdef CONFIG_PM 197 int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state) 198 { 199 struct sdhci_host *host = platform_get_drvdata(dev); 200 201 return sdhci_suspend_host(host, state); 202 } 203 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); 204 205 int sdhci_pltfm_resume(struct platform_device *dev) 206 { 207 struct sdhci_host *host = platform_get_drvdata(dev); 208 209 return sdhci_resume_host(host); 210 } 211 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); 212 #endif /* CONFIG_PM */ 213 214 static int __init sdhci_pltfm_drv_init(void) 215 { 216 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 217 218 return 0; 219 } 220 module_init(sdhci_pltfm_drv_init); 221 222 static void __exit sdhci_pltfm_drv_exit(void) 223 { 224 } 225 module_exit(sdhci_pltfm_drv_exit); 226 227 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 228 MODULE_AUTHOR("Intel Corporation"); 229 MODULE_LICENSE("GPL v2"); 230