1 /* 2 * sdhci-pltfm.c Support for SDHCI platform devices 3 * Copyright (c) 2009 Intel Corporation 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 17 */ 18 19 /* Supports: 20 * SDHCI platform devices 21 * 22 * Inspired by sdhci-pci.c, by Pierre Ossman 23 */ 24 25 #include <linux/delay.h> 26 #include <linux/highmem.h> 27 #include <linux/mod_devicetable.h> 28 #include <linux/platform_device.h> 29 30 #include <linux/mmc/host.h> 31 32 #include <linux/io.h> 33 #include <linux/mmc/sdhci-pltfm.h> 34 35 #include "sdhci.h" 36 #include "sdhci-pltfm.h" 37 38 /*****************************************************************************\ 39 * * 40 * SDHCI core callbacks * 41 * * 42 \*****************************************************************************/ 43 44 static struct sdhci_ops sdhci_pltfm_ops = { 45 }; 46 47 /*****************************************************************************\ 48 * * 49 * Device probing/removal * 50 * * 51 \*****************************************************************************/ 52 53 static int __devinit sdhci_pltfm_probe(struct platform_device *pdev) 54 { 55 const struct platform_device_id *platid = platform_get_device_id(pdev); 56 struct sdhci_pltfm_data *pdata; 57 struct sdhci_host *host; 58 struct sdhci_pltfm_host *pltfm_host; 59 struct resource *iomem; 60 int ret; 61 62 if (platid && platid->driver_data) 63 pdata = (void *)platid->driver_data; 64 else 65 pdata = pdev->dev.platform_data; 66 67 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 68 if (!iomem) { 69 ret = -ENOMEM; 70 goto err; 71 } 72 73 if (resource_size(iomem) < 0x100) 74 dev_err(&pdev->dev, "Invalid iomem size. You may " 75 "experience problems.\n"); 76 77 /* Some PCI-based MFD need the parent here */ 78 if (pdev->dev.parent != &platform_bus) 79 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host)); 80 else 81 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host)); 82 83 if (IS_ERR(host)) { 84 ret = PTR_ERR(host); 85 goto err; 86 } 87 88 pltfm_host = sdhci_priv(host); 89 90 host->hw_name = "platform"; 91 if (pdata && pdata->ops) 92 host->ops = pdata->ops; 93 else 94 host->ops = &sdhci_pltfm_ops; 95 if (pdata) 96 host->quirks = pdata->quirks; 97 host->irq = platform_get_irq(pdev, 0); 98 99 if (!request_mem_region(iomem->start, resource_size(iomem), 100 mmc_hostname(host->mmc))) { 101 dev_err(&pdev->dev, "cannot request region\n"); 102 ret = -EBUSY; 103 goto err_request; 104 } 105 106 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 107 if (!host->ioaddr) { 108 dev_err(&pdev->dev, "failed to remap registers\n"); 109 ret = -ENOMEM; 110 goto err_remap; 111 } 112 113 if (pdata && pdata->init) { 114 ret = pdata->init(host, pdata); 115 if (ret) 116 goto err_plat_init; 117 } 118 119 ret = sdhci_add_host(host); 120 if (ret) 121 goto err_add_host; 122 123 platform_set_drvdata(pdev, host); 124 125 return 0; 126 127 err_add_host: 128 if (pdata && pdata->exit) 129 pdata->exit(host); 130 err_plat_init: 131 iounmap(host->ioaddr); 132 err_remap: 133 release_mem_region(iomem->start, resource_size(iomem)); 134 err_request: 135 sdhci_free_host(host); 136 err: 137 printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret); 138 return ret; 139 } 140 141 static int __devexit sdhci_pltfm_remove(struct platform_device *pdev) 142 { 143 struct sdhci_pltfm_data *pdata = pdev->dev.platform_data; 144 struct sdhci_host *host = platform_get_drvdata(pdev); 145 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 146 int dead; 147 u32 scratch; 148 149 dead = 0; 150 scratch = readl(host->ioaddr + SDHCI_INT_STATUS); 151 if (scratch == (u32)-1) 152 dead = 1; 153 154 sdhci_remove_host(host, dead); 155 if (pdata && pdata->exit) 156 pdata->exit(host); 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 return 0; 163 } 164 165 static const struct platform_device_id sdhci_pltfm_ids[] = { 166 { "sdhci", }, 167 #ifdef CONFIG_MMC_SDHCI_CNS3XXX 168 { "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata }, 169 #endif 170 #ifdef CONFIG_MMC_SDHCI_ESDHC_IMX 171 { "sdhci-esdhc-imx", (kernel_ulong_t)&sdhci_esdhc_imx_pdata }, 172 #endif 173 { }, 174 }; 175 MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids); 176 177 #ifdef CONFIG_PM 178 static int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state) 179 { 180 struct sdhci_host *host = platform_get_drvdata(dev); 181 182 return sdhci_suspend_host(host, state); 183 } 184 185 static int sdhci_pltfm_resume(struct platform_device *dev) 186 { 187 struct sdhci_host *host = platform_get_drvdata(dev); 188 189 return sdhci_resume_host(host); 190 } 191 #else 192 #define sdhci_pltfm_suspend NULL 193 #define sdhci_pltfm_resume NULL 194 #endif /* CONFIG_PM */ 195 196 static struct platform_driver sdhci_pltfm_driver = { 197 .driver = { 198 .name = "sdhci", 199 .owner = THIS_MODULE, 200 }, 201 .probe = sdhci_pltfm_probe, 202 .remove = __devexit_p(sdhci_pltfm_remove), 203 .id_table = sdhci_pltfm_ids, 204 .suspend = sdhci_pltfm_suspend, 205 .resume = sdhci_pltfm_resume, 206 }; 207 208 /*****************************************************************************\ 209 * * 210 * Driver init/exit * 211 * * 212 \*****************************************************************************/ 213 214 static int __init sdhci_drv_init(void) 215 { 216 return platform_driver_register(&sdhci_pltfm_driver); 217 } 218 219 static void __exit sdhci_drv_exit(void) 220 { 221 platform_driver_unregister(&sdhci_pltfm_driver); 222 } 223 224 module_init(sdhci_drv_init); 225 module_exit(sdhci_drv_exit); 226 227 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver"); 228 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>"); 229 MODULE_LICENSE("GPL v2"); 230