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_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) 79 host->quirks |= SDHCI_QUIRK_BROKEN_DMA; 80 81 if (of_device_is_compatible(np, "fsl,p2020-esdhc") || 82 of_device_is_compatible(np, "fsl,p1010-esdhc") || 83 of_device_is_compatible(np, "fsl,mpc8536-esdhc")) 84 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 85 86 clk = of_get_property(np, "clock-frequency", &size); 87 if (clk && size == sizeof(*clk) && *clk) 88 pltfm_host->clock = be32_to_cpup(clk); 89 } 90 } 91 #else 92 void sdhci_get_of_property(struct platform_device *pdev) {} 93 #endif /* CONFIG_OF */ 94 EXPORT_SYMBOL_GPL(sdhci_get_of_property); 95 96 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, 97 struct sdhci_pltfm_data *pdata) 98 { 99 struct sdhci_host *host; 100 struct sdhci_pltfm_host *pltfm_host; 101 struct device_node *np = pdev->dev.of_node; 102 struct resource *iomem; 103 int ret; 104 105 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 106 if (!iomem) { 107 ret = -ENOMEM; 108 goto err; 109 } 110 111 if (resource_size(iomem) < 0x100) 112 dev_err(&pdev->dev, "Invalid iomem size!\n"); 113 114 /* Some PCI-based MFD need the parent here */ 115 if (pdev->dev.parent != &platform_bus && !np) 116 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host)); 117 else 118 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host)); 119 120 if (IS_ERR(host)) { 121 ret = PTR_ERR(host); 122 goto err; 123 } 124 125 pltfm_host = sdhci_priv(host); 126 127 host->hw_name = dev_name(&pdev->dev); 128 if (pdata && pdata->ops) 129 host->ops = pdata->ops; 130 else 131 host->ops = &sdhci_pltfm_ops; 132 if (pdata) 133 host->quirks = pdata->quirks; 134 host->irq = platform_get_irq(pdev, 0); 135 136 if (!request_mem_region(iomem->start, resource_size(iomem), 137 mmc_hostname(host->mmc))) { 138 dev_err(&pdev->dev, "cannot request region\n"); 139 ret = -EBUSY; 140 goto err_request; 141 } 142 143 host->ioaddr = ioremap(iomem->start, resource_size(iomem)); 144 if (!host->ioaddr) { 145 dev_err(&pdev->dev, "failed to remap registers\n"); 146 ret = -ENOMEM; 147 goto err_remap; 148 } 149 150 platform_set_drvdata(pdev, host); 151 152 return host; 153 154 err_remap: 155 release_mem_region(iomem->start, resource_size(iomem)); 156 err_request: 157 sdhci_free_host(host); 158 err: 159 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); 160 return ERR_PTR(ret); 161 } 162 EXPORT_SYMBOL_GPL(sdhci_pltfm_init); 163 164 void sdhci_pltfm_free(struct platform_device *pdev) 165 { 166 struct sdhci_host *host = platform_get_drvdata(pdev); 167 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 168 169 iounmap(host->ioaddr); 170 release_mem_region(iomem->start, resource_size(iomem)); 171 sdhci_free_host(host); 172 platform_set_drvdata(pdev, NULL); 173 } 174 EXPORT_SYMBOL_GPL(sdhci_pltfm_free); 175 176 int sdhci_pltfm_register(struct platform_device *pdev, 177 struct sdhci_pltfm_data *pdata) 178 { 179 struct sdhci_host *host; 180 int ret = 0; 181 182 host = sdhci_pltfm_init(pdev, pdata); 183 if (IS_ERR(host)) 184 return PTR_ERR(host); 185 186 sdhci_get_of_property(pdev); 187 188 ret = sdhci_add_host(host); 189 if (ret) 190 sdhci_pltfm_free(pdev); 191 192 return ret; 193 } 194 EXPORT_SYMBOL_GPL(sdhci_pltfm_register); 195 196 int sdhci_pltfm_unregister(struct platform_device *pdev) 197 { 198 struct sdhci_host *host = platform_get_drvdata(pdev); 199 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 200 201 sdhci_remove_host(host, dead); 202 sdhci_pltfm_free(pdev); 203 204 return 0; 205 } 206 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); 207 208 #ifdef CONFIG_PM 209 static int sdhci_pltfm_suspend(struct device *dev) 210 { 211 struct sdhci_host *host = dev_get_drvdata(dev); 212 213 return sdhci_suspend_host(host); 214 } 215 216 static int sdhci_pltfm_resume(struct device *dev) 217 { 218 struct sdhci_host *host = dev_get_drvdata(dev); 219 220 return sdhci_resume_host(host); 221 } 222 223 const struct dev_pm_ops sdhci_pltfm_pmops = { 224 .suspend = sdhci_pltfm_suspend, 225 .resume = sdhci_pltfm_resume, 226 }; 227 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); 228 #endif /* CONFIG_PM */ 229 230 static int __init sdhci_pltfm_drv_init(void) 231 { 232 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); 233 234 return 0; 235 } 236 module_init(sdhci_pltfm_drv_init); 237 238 static void __exit sdhci_pltfm_drv_exit(void) 239 { 240 } 241 module_exit(sdhci_pltfm_drv_exit); 242 243 MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); 244 MODULE_AUTHOR("Intel Corporation"); 245 MODULE_LICENSE("GPL v2"); 246