| 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 | unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host) |
| 40 | { |
| 41 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); |
| 42 | |
| 43 | return clk_get_rate(pltfm_host->clk); |
| 44 | } |
| 45 | EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock); |
| 46 | |
| 47 | static const struct sdhci_ops sdhci_pltfm_ops = { |
| 48 | .set_clock = sdhci_set_clock, |
| 49 | .set_bus_width = sdhci_set_bus_width, |
| 50 | .reset = sdhci_reset, |
| 51 | .set_uhs_signaling = sdhci_set_uhs_signaling, |
| 52 | }; |
| 53 | |
| 54 | #ifdef CONFIG_OF |
| 55 | static bool sdhci_of_wp_inverted(struct device_node *np) |
| 56 | { |
| 57 | if (of_get_property(np, "sdhci,wp-inverted", NULL) || |
| 58 | of_get_property(np, "wp-inverted", NULL)) |
| 59 | return true; |
| 60 | |
| 61 | /* Old device trees don't have the wp-inverted property. */ |
| 62 | #ifdef CONFIG_PPC |
| 63 | return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds); |
| 64 | #else |
| 65 | return false; |
| 66 | #endif /* CONFIG_PPC */ |
| 67 | } |
| 68 | |
| 69 | void sdhci_get_of_property(struct platform_device *pdev) |
| 70 | { |
| 71 | struct device_node *np = pdev->dev.of_node; |
| 72 | struct sdhci_host *host = platform_get_drvdata(pdev); |
| 73 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); |
| 74 | u32 bus_width; |
| 75 | |
| 76 | if (of_get_property(np, "sdhci,auto-cmd12", NULL)) |
| 77 | host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12; |
| 78 | |
| 79 | if (of_get_property(np, "sdhci,1-bit-only", NULL) || |
| 80 | (of_property_read_u32(np, "bus-width", &bus_width) == 0 && |
| 81 | bus_width == 1)) |
| 82 | host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA; |
| 83 | |
| 84 | if (sdhci_of_wp_inverted(np)) |
| 85 | host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; |
| 86 | |
| 87 | if (of_get_property(np, "broken-cd", NULL)) |
| 88 | host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; |
| 89 | |
| 90 | if (of_get_property(np, "no-1-8-v", NULL)) |
| 91 | host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V; |
| 92 | |
| 93 | if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc")) |
| 94 | host->quirks |= SDHCI_QUIRK_BROKEN_DMA; |
| 95 | |
| 96 | if (of_device_is_compatible(np, "fsl,p2020-esdhc") || |
| 97 | of_device_is_compatible(np, "fsl,p1010-esdhc") || |
| 98 | of_device_is_compatible(np, "fsl,t4240-esdhc") || |
| 99 | of_device_is_compatible(np, "fsl,mpc8536-esdhc")) |
| 100 | host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; |
| 101 | |
| 102 | of_property_read_u32(np, "clock-frequency", &pltfm_host->clock); |
| 103 | |
| 104 | if (of_find_property(np, "keep-power-in-suspend", NULL)) |
| 105 | host->mmc->pm_caps |= MMC_PM_KEEP_POWER; |
| 106 | |
| 107 | if (of_property_read_bool(np, "wakeup-source") || |
| 108 | of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */ |
| 109 | host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; |
| 110 | } |
| 111 | #else |
| 112 | void sdhci_get_of_property(struct platform_device *pdev) {} |
| 113 | #endif /* CONFIG_OF */ |
| 114 | EXPORT_SYMBOL_GPL(sdhci_get_of_property); |
| 115 | |
| 116 | struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev, |
| 117 | const struct sdhci_pltfm_data *pdata, |
| 118 | size_t priv_size) |
| 119 | { |
| 120 | struct sdhci_host *host; |
| 121 | struct resource *iomem; |
| 122 | void __iomem *ioaddr; |
| 123 | int irq, ret; |
| 124 | |
| 125 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 126 | ioaddr = devm_ioremap_resource(&pdev->dev, iomem); |
| 127 | if (IS_ERR(ioaddr)) { |
| 128 | ret = PTR_ERR(ioaddr); |
| 129 | goto err; |
| 130 | } |
| 131 | |
| 132 | irq = platform_get_irq(pdev, 0); |
| 133 | if (irq < 0) { |
| 134 | dev_err(&pdev->dev, "failed to get IRQ number\n"); |
| 135 | ret = irq; |
| 136 | goto err; |
| 137 | } |
| 138 | |
| 139 | host = sdhci_alloc_host(&pdev->dev, |
| 140 | sizeof(struct sdhci_pltfm_host) + priv_size); |
| 141 | |
| 142 | if (IS_ERR(host)) { |
| 143 | ret = PTR_ERR(host); |
| 144 | goto err; |
| 145 | } |
| 146 | |
| 147 | host->ioaddr = ioaddr; |
| 148 | host->irq = irq; |
| 149 | host->hw_name = dev_name(&pdev->dev); |
| 150 | if (pdata && pdata->ops) |
| 151 | host->ops = pdata->ops; |
| 152 | else |
| 153 | host->ops = &sdhci_pltfm_ops; |
| 154 | if (pdata) { |
| 155 | host->quirks = pdata->quirks; |
| 156 | host->quirks2 = pdata->quirks2; |
| 157 | } |
| 158 | |
| 159 | platform_set_drvdata(pdev, host); |
| 160 | |
| 161 | return host; |
| 162 | err: |
| 163 | dev_err(&pdev->dev, "%s failed %d\n", __func__, ret); |
| 164 | return ERR_PTR(ret); |
| 165 | } |
| 166 | EXPORT_SYMBOL_GPL(sdhci_pltfm_init); |
| 167 | |
| 168 | void sdhci_pltfm_free(struct platform_device *pdev) |
| 169 | { |
| 170 | struct sdhci_host *host = platform_get_drvdata(pdev); |
| 171 | |
| 172 | sdhci_free_host(host); |
| 173 | } |
| 174 | EXPORT_SYMBOL_GPL(sdhci_pltfm_free); |
| 175 | |
| 176 | int sdhci_pltfm_register(struct platform_device *pdev, |
| 177 | const struct sdhci_pltfm_data *pdata, |
| 178 | size_t priv_size) |
| 179 | { |
| 180 | struct sdhci_host *host; |
| 181 | int ret = 0; |
| 182 | |
| 183 | host = sdhci_pltfm_init(pdev, pdata, priv_size); |
| 184 | if (IS_ERR(host)) |
| 185 | return PTR_ERR(host); |
| 186 | |
| 187 | sdhci_get_of_property(pdev); |
| 188 | |
| 189 | ret = sdhci_add_host(host); |
| 190 | if (ret) |
| 191 | sdhci_pltfm_free(pdev); |
| 192 | |
| 193 | return ret; |
| 194 | } |
| 195 | EXPORT_SYMBOL_GPL(sdhci_pltfm_register); |
| 196 | |
| 197 | int sdhci_pltfm_unregister(struct platform_device *pdev) |
| 198 | { |
| 199 | struct sdhci_host *host = platform_get_drvdata(pdev); |
| 200 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); |
| 201 | int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); |
| 202 | |
| 203 | sdhci_remove_host(host, dead); |
| 204 | clk_disable_unprepare(pltfm_host->clk); |
| 205 | sdhci_pltfm_free(pdev); |
| 206 | |
| 207 | return 0; |
| 208 | } |
| 209 | EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister); |
| 210 | |
| 211 | #ifdef CONFIG_PM_SLEEP |
| 212 | int sdhci_pltfm_suspend(struct device *dev) |
| 213 | { |
| 214 | struct sdhci_host *host = dev_get_drvdata(dev); |
| 215 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); |
| 216 | int ret; |
| 217 | |
| 218 | if (host->tuning_mode != SDHCI_TUNING_MODE_3) |
| 219 | mmc_retune_needed(host->mmc); |
| 220 | |
| 221 | ret = sdhci_suspend_host(host); |
| 222 | if (ret) |
| 223 | return ret; |
| 224 | |
| 225 | clk_disable_unprepare(pltfm_host->clk); |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend); |
| 230 | |
| 231 | int sdhci_pltfm_resume(struct device *dev) |
| 232 | { |
| 233 | struct sdhci_host *host = dev_get_drvdata(dev); |
| 234 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); |
| 235 | int ret; |
| 236 | |
| 237 | ret = clk_prepare_enable(pltfm_host->clk); |
| 238 | if (ret) |
| 239 | return ret; |
| 240 | |
| 241 | ret = sdhci_resume_host(host); |
| 242 | if (ret) |
| 243 | clk_disable_unprepare(pltfm_host->clk); |
| 244 | |
| 245 | return ret; |
| 246 | } |
| 247 | EXPORT_SYMBOL_GPL(sdhci_pltfm_resume); |
| 248 | #endif |
| 249 | |
| 250 | const struct dev_pm_ops sdhci_pltfm_pmops = { |
| 251 | SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume) |
| 252 | }; |
| 253 | EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops); |
| 254 | |
| 255 | static int __init sdhci_pltfm_drv_init(void) |
| 256 | { |
| 257 | pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n"); |
| 258 | |
| 259 | return 0; |
| 260 | } |
| 261 | module_init(sdhci_pltfm_drv_init); |
| 262 | |
| 263 | static void __exit sdhci_pltfm_drv_exit(void) |
| 264 | { |
| 265 | } |
| 266 | module_exit(sdhci_pltfm_drv_exit); |
| 267 | |
| 268 | MODULE_DESCRIPTION("SDHCI platform and OF driver helper"); |
| 269 | MODULE_AUTHOR("Intel Corporation"); |
| 270 | MODULE_LICENSE("GPL v2"); |