1 /* 2 * Copyright (C) 2010 Google, Inc. 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 */ 14 15 #include <linux/err.h> 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/platform_device.h> 19 #include <linux/clk.h> 20 #include <linux/io.h> 21 #include <linux/of.h> 22 #include <linux/of_device.h> 23 #include <linux/of_gpio.h> 24 #include <linux/gpio.h> 25 #include <linux/mmc/card.h> 26 #include <linux/mmc/host.h> 27 #include <linux/mmc/slot-gpio.h> 28 29 #include <asm/gpio.h> 30 31 #include "sdhci-pltfm.h" 32 33 /* Tegra SDHOST controller vendor register definitions */ 34 #define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120 35 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20 36 37 #define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0) 38 #define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1) 39 #define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2) 40 41 struct sdhci_tegra_soc_data { 42 const struct sdhci_pltfm_data *pdata; 43 u32 nvquirks; 44 }; 45 46 struct sdhci_tegra { 47 const struct sdhci_tegra_soc_data *soc_data; 48 int power_gpio; 49 }; 50 51 static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg) 52 { 53 u32 val; 54 55 if (unlikely(reg == SDHCI_PRESENT_STATE)) { 56 /* Use wp_gpio here instead? */ 57 val = readl(host->ioaddr + reg); 58 return val | SDHCI_WRITE_PROTECT; 59 } 60 61 return readl(host->ioaddr + reg); 62 } 63 64 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg) 65 { 66 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 67 struct sdhci_tegra *tegra_host = pltfm_host->priv; 68 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 69 70 if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) && 71 (reg == SDHCI_HOST_VERSION))) { 72 /* Erratum: Version register is invalid in HW. */ 73 return SDHCI_SPEC_200; 74 } 75 76 return readw(host->ioaddr + reg); 77 } 78 79 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg) 80 { 81 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 82 struct sdhci_tegra *tegra_host = pltfm_host->priv; 83 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 84 85 /* Seems like we're getting spurious timeout and crc errors, so 86 * disable signalling of them. In case of real errors software 87 * timers should take care of eventually detecting them. 88 */ 89 if (unlikely(reg == SDHCI_SIGNAL_ENABLE)) 90 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC); 91 92 writel(val, host->ioaddr + reg); 93 94 if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) && 95 (reg == SDHCI_INT_ENABLE))) { 96 /* Erratum: Must enable block gap interrupt detection */ 97 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL); 98 if (val & SDHCI_INT_CARD_INT) 99 gap_ctrl |= 0x8; 100 else 101 gap_ctrl &= ~0x8; 102 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL); 103 } 104 } 105 106 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host) 107 { 108 return mmc_gpio_get_ro(host->mmc); 109 } 110 111 static void tegra_sdhci_reset_exit(struct sdhci_host *host, u8 mask) 112 { 113 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 114 struct sdhci_tegra *tegra_host = pltfm_host->priv; 115 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; 116 117 if (!(mask & SDHCI_RESET_ALL)) 118 return; 119 120 /* Erratum: Enable SDHCI spec v3.00 support */ 121 if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300) { 122 u32 misc_ctrl; 123 124 misc_ctrl = sdhci_readb(host, SDHCI_TEGRA_VENDOR_MISC_CTRL); 125 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300; 126 sdhci_writeb(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL); 127 } 128 } 129 130 static int tegra_sdhci_buswidth(struct sdhci_host *host, int bus_width) 131 { 132 u32 ctrl; 133 134 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 135 if ((host->mmc->caps & MMC_CAP_8_BIT_DATA) && 136 (bus_width == MMC_BUS_WIDTH_8)) { 137 ctrl &= ~SDHCI_CTRL_4BITBUS; 138 ctrl |= SDHCI_CTRL_8BITBUS; 139 } else { 140 ctrl &= ~SDHCI_CTRL_8BITBUS; 141 if (bus_width == MMC_BUS_WIDTH_4) 142 ctrl |= SDHCI_CTRL_4BITBUS; 143 else 144 ctrl &= ~SDHCI_CTRL_4BITBUS; 145 } 146 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); 147 return 0; 148 } 149 150 static const struct sdhci_ops tegra_sdhci_ops = { 151 .get_ro = tegra_sdhci_get_ro, 152 .read_l = tegra_sdhci_readl, 153 .read_w = tegra_sdhci_readw, 154 .write_l = tegra_sdhci_writel, 155 .platform_bus_width = tegra_sdhci_buswidth, 156 .platform_reset_exit = tegra_sdhci_reset_exit, 157 }; 158 159 static const struct sdhci_pltfm_data sdhci_tegra20_pdata = { 160 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 161 SDHCI_QUIRK_SINGLE_POWER_WRITE | 162 SDHCI_QUIRK_NO_HISPD_BIT | 163 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC, 164 .ops = &tegra_sdhci_ops, 165 }; 166 167 static struct sdhci_tegra_soc_data soc_data_tegra20 = { 168 .pdata = &sdhci_tegra20_pdata, 169 .nvquirks = NVQUIRK_FORCE_SDHCI_SPEC_200 | 170 NVQUIRK_ENABLE_BLOCK_GAP_DET, 171 }; 172 173 static const struct sdhci_pltfm_data sdhci_tegra30_pdata = { 174 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 175 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | 176 SDHCI_QUIRK_SINGLE_POWER_WRITE | 177 SDHCI_QUIRK_NO_HISPD_BIT | 178 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC, 179 .ops = &tegra_sdhci_ops, 180 }; 181 182 static struct sdhci_tegra_soc_data soc_data_tegra30 = { 183 .pdata = &sdhci_tegra30_pdata, 184 .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300, 185 }; 186 187 static const struct sdhci_pltfm_data sdhci_tegra114_pdata = { 188 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | 189 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | 190 SDHCI_QUIRK_SINGLE_POWER_WRITE | 191 SDHCI_QUIRK_NO_HISPD_BIT | 192 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC, 193 .ops = &tegra_sdhci_ops, 194 }; 195 196 static struct sdhci_tegra_soc_data soc_data_tegra114 = { 197 .pdata = &sdhci_tegra114_pdata, 198 }; 199 200 static const struct of_device_id sdhci_tegra_dt_match[] = { 201 { .compatible = "nvidia,tegra114-sdhci", .data = &soc_data_tegra114 }, 202 { .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 }, 203 { .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 }, 204 {} 205 }; 206 MODULE_DEVICE_TABLE(of, sdhci_tegra_dt_match); 207 208 static int sdhci_tegra_parse_dt(struct device *dev) 209 { 210 struct device_node *np = dev->of_node; 211 struct sdhci_host *host = dev_get_drvdata(dev); 212 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 213 struct sdhci_tegra *tegra_host = pltfm_host->priv; 214 215 tegra_host->power_gpio = of_get_named_gpio(np, "power-gpios", 0); 216 return mmc_of_parse(host->mmc); 217 } 218 219 static int sdhci_tegra_probe(struct platform_device *pdev) 220 { 221 const struct of_device_id *match; 222 const struct sdhci_tegra_soc_data *soc_data; 223 struct sdhci_host *host; 224 struct sdhci_pltfm_host *pltfm_host; 225 struct sdhci_tegra *tegra_host; 226 struct clk *clk; 227 int rc; 228 229 match = of_match_device(sdhci_tegra_dt_match, &pdev->dev); 230 if (!match) 231 return -EINVAL; 232 soc_data = match->data; 233 234 host = sdhci_pltfm_init(pdev, soc_data->pdata, 0); 235 if (IS_ERR(host)) 236 return PTR_ERR(host); 237 pltfm_host = sdhci_priv(host); 238 239 tegra_host = devm_kzalloc(&pdev->dev, sizeof(*tegra_host), GFP_KERNEL); 240 if (!tegra_host) { 241 dev_err(mmc_dev(host->mmc), "failed to allocate tegra_host\n"); 242 rc = -ENOMEM; 243 goto err_alloc_tegra_host; 244 } 245 tegra_host->soc_data = soc_data; 246 pltfm_host->priv = tegra_host; 247 248 rc = sdhci_tegra_parse_dt(&pdev->dev); 249 if (rc) 250 goto err_parse_dt; 251 252 if (gpio_is_valid(tegra_host->power_gpio)) { 253 rc = gpio_request(tegra_host->power_gpio, "sdhci_power"); 254 if (rc) { 255 dev_err(mmc_dev(host->mmc), 256 "failed to allocate power gpio\n"); 257 goto err_power_req; 258 } 259 gpio_direction_output(tegra_host->power_gpio, 1); 260 } 261 262 clk = clk_get(mmc_dev(host->mmc), NULL); 263 if (IS_ERR(clk)) { 264 dev_err(mmc_dev(host->mmc), "clk err\n"); 265 rc = PTR_ERR(clk); 266 goto err_clk_get; 267 } 268 clk_prepare_enable(clk); 269 pltfm_host->clk = clk; 270 271 rc = sdhci_add_host(host); 272 if (rc) 273 goto err_add_host; 274 275 return 0; 276 277 err_add_host: 278 clk_disable_unprepare(pltfm_host->clk); 279 clk_put(pltfm_host->clk); 280 err_clk_get: 281 if (gpio_is_valid(tegra_host->power_gpio)) 282 gpio_free(tegra_host->power_gpio); 283 err_power_req: 284 err_parse_dt: 285 err_alloc_tegra_host: 286 sdhci_pltfm_free(pdev); 287 return rc; 288 } 289 290 static int sdhci_tegra_remove(struct platform_device *pdev) 291 { 292 struct sdhci_host *host = platform_get_drvdata(pdev); 293 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 294 struct sdhci_tegra *tegra_host = pltfm_host->priv; 295 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); 296 297 sdhci_remove_host(host, dead); 298 299 if (gpio_is_valid(tegra_host->power_gpio)) 300 gpio_free(tegra_host->power_gpio); 301 302 clk_disable_unprepare(pltfm_host->clk); 303 clk_put(pltfm_host->clk); 304 305 sdhci_pltfm_free(pdev); 306 307 return 0; 308 } 309 310 static struct platform_driver sdhci_tegra_driver = { 311 .driver = { 312 .name = "sdhci-tegra", 313 .owner = THIS_MODULE, 314 .of_match_table = sdhci_tegra_dt_match, 315 .pm = SDHCI_PLTFM_PMOPS, 316 }, 317 .probe = sdhci_tegra_probe, 318 .remove = sdhci_tegra_remove, 319 }; 320 321 module_platform_driver(sdhci_tegra_driver); 322 323 MODULE_DESCRIPTION("SDHCI driver for Tegra"); 324 MODULE_AUTHOR("Google, Inc."); 325 MODULE_LICENSE("GPL v2"); 326