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/sdhci-pltfm.h> 34 35#include "sdhci.h" 36#include "sdhci-pltfm.h" 37 38/*****************************************************************************\ 39 * * 40 * SDHCI core callbacks * 41 * * 42\*****************************************************************************/ 43 44static struct sdhci_ops sdhci_pltfm_ops = { 45}; 46 47/*****************************************************************************\ 48 * * 49 * Device probing/removal * 50 * * 51\*****************************************************************************/ 52 53static int __devinit sdhci_pltfm_probe(struct platform_device *pdev) 54{ 55 struct sdhci_pltfm_data *pdata = pdev->dev.platform_data; 56 const struct platform_device_id *platid = platform_get_device_id(pdev); 57 struct sdhci_host *host; 58 struct resource *iomem; 59 int ret; 60 61 if (!pdata && platid && platid->driver_data) 62 pdata = (void *)platid->driver_data; 63 64 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 65 if (!iomem) { 66 ret = -ENOMEM; 67 goto err; 68 } 69 70 if (resource_size(iomem) < 0x100) 71 dev_err(&pdev->dev, "Invalid iomem size. You may " 72 "experience problems.\n"); 73 74 if (pdev->dev.parent) 75 host = sdhci_alloc_host(pdev->dev.parent, 0); 76 else 77 host = sdhci_alloc_host(&pdev->dev, 0); 78 79 if (IS_ERR(host)) { 80 ret = PTR_ERR(host); 81 goto err; 82 } 83 84 host->hw_name = "platform"; 85 if (pdata && pdata->ops) 86 host->ops = pdata->ops; 87 else 88 host->ops = &sdhci_pltfm_ops; 89 if (pdata) 90 host->quirks = pdata->quirks; 91 host->irq = platform_get_irq(pdev, 0); 92 93 if (!request_mem_region(iomem->start, resource_size(iomem), 94 mmc_hostname(host->mmc))) { 95 dev_err(&pdev->dev, "cannot request region\n"); 96 ret = -EBUSY; 97 goto err_request; 98 } 99 100 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 101 if (!host->ioaddr) { 102 dev_err(&pdev->dev, "failed to remap registers\n"); 103 ret = -ENOMEM; 104 goto err_remap; 105 } 106 107 if (pdata && pdata->init) { 108 ret = pdata->init(host); 109 if (ret) 110 goto err_plat_init; 111 } 112 113 ret = sdhci_add_host(host); 114 if (ret) 115 goto err_add_host; 116 117 platform_set_drvdata(pdev, host); 118 119 return 0; 120 121err_add_host: 122 if (pdata && pdata->exit) 123 pdata->exit(host); 124err_plat_init: 125 iounmap(host->ioaddr); 126err_remap: 127 release_mem_region(iomem->start, resource_size(iomem)); 128err_request: 129 sdhci_free_host(host); 130err: 131 printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret); 132 return ret; 133} 134 135static int __devexit sdhci_pltfm_remove(struct platform_device *pdev) 136{ 137 struct sdhci_pltfm_data *pdata = pdev->dev.platform_data; 138 struct sdhci_host *host = platform_get_drvdata(pdev); 139 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 140 int dead; 141 u32 scratch; 142 143 dead = 0; 144 scratch = readl(host->ioaddr + SDHCI_INT_STATUS); 145 if (scratch == (u32)-1) 146 dead = 1; 147 148 sdhci_remove_host(host, dead); 149 if (pdata && pdata->exit) 150 pdata->exit(host); 151 iounmap(host->ioaddr); 152 release_mem_region(iomem->start, resource_size(iomem)); 153 sdhci_free_host(host); 154 platform_set_drvdata(pdev, NULL); 155 156 return 0; 157} 158 159static const struct platform_device_id sdhci_pltfm_ids[] = { 160 { "sdhci", }, 161#ifdef CONFIG_MMC_SDHCI_CNS3XXX 162 { "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata }, 163#endif 164 { }, 165}; 166MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids); 167 168static struct platform_driver sdhci_pltfm_driver = { 169 .driver = { 170 .name = "sdhci", 171 .owner = THIS_MODULE, 172 }, 173 .probe = sdhci_pltfm_probe, 174 .remove = __devexit_p(sdhci_pltfm_remove), 175 .id_table = sdhci_pltfm_ids, 176}; 177 178/*****************************************************************************\ 179 * * 180 * Driver init/exit * 181 * * 182\*****************************************************************************/ 183 184static int __init sdhci_drv_init(void) 185{ 186 return platform_driver_register(&sdhci_pltfm_driver); 187} 188 189static void __exit sdhci_drv_exit(void) 190{ 191 platform_driver_unregister(&sdhci_pltfm_driver); 192} 193 194module_init(sdhci_drv_init); 195module_exit(sdhci_drv_exit); 196 197MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver"); 198MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>"); 199MODULE_LICENSE("GPL v2"); 200