1 /* 2 * Copyright (C) 2010 Marvell International Ltd. 3 * Zhangfei Gao <zhangfei.gao@marvell.com> 4 * Kevin Wang <dwang4@marvell.com> 5 * Mingwei Wang <mwwang@marvell.com> 6 * Philip Rakity <prakity@marvell.com> 7 * Mark Brown <markb@marvell.com> 8 * 9 * This software is licensed under the terms of the GNU General Public 10 * License version 2, as published by the Free Software Foundation, and 11 * may be copied, distributed, and modified under those terms. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 */ 19 #include <linux/err.h> 20 #include <linux/init.h> 21 #include <linux/platform_device.h> 22 #include <linux/clk.h> 23 #include <linux/io.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 #include <linux/platform_data/pxa_sdhci.h> 29 #include <linux/slab.h> 30 #include <linux/delay.h> 31 #include <linux/module.h> 32 #include <linux/of.h> 33 #include <linux/of_device.h> 34 #include <linux/of_gpio.h> 35 #include <linux/pm.h> 36 #include <linux/pm_runtime.h> 37 #include <linux/mbus.h> 38 39 #include "sdhci.h" 40 #include "sdhci-pltfm.h" 41 42 #define PXAV3_RPM_DELAY_MS 50 43 44 #define SD_CLOCK_BURST_SIZE_SETUP 0x10A 45 #define SDCLK_SEL 0x100 46 #define SDCLK_DELAY_SHIFT 9 47 #define SDCLK_DELAY_MASK 0x1f 48 49 #define SD_CFG_FIFO_PARAM 0x100 50 #define SDCFG_GEN_PAD_CLK_ON (1<<6) 51 #define SDCFG_GEN_PAD_CLK_CNT_MASK 0xFF 52 #define SDCFG_GEN_PAD_CLK_CNT_SHIFT 24 53 54 #define SD_SPI_MODE 0x108 55 #define SD_CE_ATA_1 0x10C 56 57 #define SD_CE_ATA_2 0x10E 58 #define SDCE_MISC_INT (1<<2) 59 #define SDCE_MISC_INT_EN (1<<1) 60 61 /* 62 * These registers are relative to the second register region, for the 63 * MBus bridge. 64 */ 65 #define SDHCI_WINDOW_CTRL(i) (0x80 + ((i) << 3)) 66 #define SDHCI_WINDOW_BASE(i) (0x84 + ((i) << 3)) 67 #define SDHCI_MAX_WIN_NUM 8 68 69 static int mv_conf_mbus_windows(struct platform_device *pdev, 70 const struct mbus_dram_target_info *dram) 71 { 72 int i; 73 void __iomem *regs; 74 struct resource *res; 75 76 if (!dram) { 77 dev_err(&pdev->dev, "no mbus dram info\n"); 78 return -EINVAL; 79 } 80 81 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 82 if (!res) { 83 dev_err(&pdev->dev, "cannot get mbus registers\n"); 84 return -EINVAL; 85 } 86 87 regs = ioremap(res->start, resource_size(res)); 88 if (!regs) { 89 dev_err(&pdev->dev, "cannot map mbus registers\n"); 90 return -ENOMEM; 91 } 92 93 for (i = 0; i < SDHCI_MAX_WIN_NUM; i++) { 94 writel(0, regs + SDHCI_WINDOW_CTRL(i)); 95 writel(0, regs + SDHCI_WINDOW_BASE(i)); 96 } 97 98 for (i = 0; i < dram->num_cs; i++) { 99 const struct mbus_dram_window *cs = dram->cs + i; 100 101 /* Write size, attributes and target id to control register */ 102 writel(((cs->size - 1) & 0xffff0000) | 103 (cs->mbus_attr << 8) | 104 (dram->mbus_dram_target_id << 4) | 1, 105 regs + SDHCI_WINDOW_CTRL(i)); 106 /* Write base address to base register */ 107 writel(cs->base, regs + SDHCI_WINDOW_BASE(i)); 108 } 109 110 iounmap(regs); 111 112 return 0; 113 } 114 115 static void pxav3_reset(struct sdhci_host *host, u8 mask) 116 { 117 struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc)); 118 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 119 120 sdhci_reset(host, mask); 121 122 if (mask == SDHCI_RESET_ALL) { 123 /* 124 * tune timing of read data/command when crc error happen 125 * no performance impact 126 */ 127 if (pdata && 0 != pdata->clk_delay_cycles) { 128 u16 tmp; 129 130 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); 131 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK) 132 << SDCLK_DELAY_SHIFT; 133 tmp |= SDCLK_SEL; 134 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP); 135 } 136 } 137 } 138 139 #define MAX_WAIT_COUNT 5 140 static void pxav3_gen_init_74_clocks(struct sdhci_host *host, u8 power_mode) 141 { 142 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 143 struct sdhci_pxa *pxa = pltfm_host->priv; 144 u16 tmp; 145 int count; 146 147 if (pxa->power_mode == MMC_POWER_UP 148 && power_mode == MMC_POWER_ON) { 149 150 dev_dbg(mmc_dev(host->mmc), 151 "%s: slot->power_mode = %d," 152 "ios->power_mode = %d\n", 153 __func__, 154 pxa->power_mode, 155 power_mode); 156 157 /* set we want notice of when 74 clocks are sent */ 158 tmp = readw(host->ioaddr + SD_CE_ATA_2); 159 tmp |= SDCE_MISC_INT_EN; 160 writew(tmp, host->ioaddr + SD_CE_ATA_2); 161 162 /* start sending the 74 clocks */ 163 tmp = readw(host->ioaddr + SD_CFG_FIFO_PARAM); 164 tmp |= SDCFG_GEN_PAD_CLK_ON; 165 writew(tmp, host->ioaddr + SD_CFG_FIFO_PARAM); 166 167 /* slowest speed is about 100KHz or 10usec per clock */ 168 udelay(740); 169 count = 0; 170 171 while (count++ < MAX_WAIT_COUNT) { 172 if ((readw(host->ioaddr + SD_CE_ATA_2) 173 & SDCE_MISC_INT) == 0) 174 break; 175 udelay(10); 176 } 177 178 if (count == MAX_WAIT_COUNT) 179 dev_warn(mmc_dev(host->mmc), "74 clock interrupt not cleared\n"); 180 181 /* clear the interrupt bit if posted */ 182 tmp = readw(host->ioaddr + SD_CE_ATA_2); 183 tmp |= SDCE_MISC_INT; 184 writew(tmp, host->ioaddr + SD_CE_ATA_2); 185 } 186 pxa->power_mode = power_mode; 187 } 188 189 static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs) 190 { 191 u16 ctrl_2; 192 193 /* 194 * Set V18_EN -- UHS modes do not work without this. 195 * does not change signaling voltage 196 */ 197 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 198 199 /* Select Bus Speed Mode for host */ 200 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; 201 switch (uhs) { 202 case MMC_TIMING_UHS_SDR12: 203 ctrl_2 |= SDHCI_CTRL_UHS_SDR12; 204 break; 205 case MMC_TIMING_UHS_SDR25: 206 ctrl_2 |= SDHCI_CTRL_UHS_SDR25; 207 break; 208 case MMC_TIMING_UHS_SDR50: 209 ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180; 210 break; 211 case MMC_TIMING_UHS_SDR104: 212 ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180; 213 break; 214 case MMC_TIMING_UHS_DDR50: 215 ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180; 216 break; 217 } 218 219 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 220 dev_dbg(mmc_dev(host->mmc), 221 "%s uhs = %d, ctrl_2 = %04X\n", 222 __func__, uhs, ctrl_2); 223 } 224 225 static const struct sdhci_ops pxav3_sdhci_ops = { 226 .set_clock = sdhci_set_clock, 227 .platform_send_init_74_clocks = pxav3_gen_init_74_clocks, 228 .get_max_clock = sdhci_pltfm_clk_get_max_clock, 229 .set_bus_width = sdhci_set_bus_width, 230 .reset = pxav3_reset, 231 .set_uhs_signaling = pxav3_set_uhs_signaling, 232 }; 233 234 static struct sdhci_pltfm_data sdhci_pxav3_pdata = { 235 .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK 236 | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC 237 | SDHCI_QUIRK_32BIT_ADMA_SIZE 238 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 239 .ops = &pxav3_sdhci_ops, 240 }; 241 242 #ifdef CONFIG_OF 243 static const struct of_device_id sdhci_pxav3_of_match[] = { 244 { 245 .compatible = "mrvl,pxav3-mmc", 246 }, 247 { 248 .compatible = "marvell,armada-380-sdhci", 249 }, 250 {}, 251 }; 252 MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match); 253 254 static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev) 255 { 256 struct sdhci_pxa_platdata *pdata; 257 struct device_node *np = dev->of_node; 258 u32 clk_delay_cycles; 259 260 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 261 if (!pdata) 262 return NULL; 263 264 of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles); 265 if (clk_delay_cycles > 0) 266 pdata->clk_delay_cycles = clk_delay_cycles; 267 268 return pdata; 269 } 270 #else 271 static inline struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev) 272 { 273 return NULL; 274 } 275 #endif 276 277 static int sdhci_pxav3_probe(struct platform_device *pdev) 278 { 279 struct sdhci_pltfm_host *pltfm_host; 280 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data; 281 struct device *dev = &pdev->dev; 282 struct device_node *np = pdev->dev.of_node; 283 struct sdhci_host *host = NULL; 284 struct sdhci_pxa *pxa = NULL; 285 const struct of_device_id *match; 286 287 int ret; 288 struct clk *clk; 289 290 pxa = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_pxa), GFP_KERNEL); 291 if (!pxa) 292 return -ENOMEM; 293 294 host = sdhci_pltfm_init(pdev, &sdhci_pxav3_pdata, 0); 295 if (IS_ERR(host)) 296 return PTR_ERR(host); 297 298 if (of_device_is_compatible(np, "marvell,armada-380-sdhci")) { 299 ret = mv_conf_mbus_windows(pdev, mv_mbus_dram_info()); 300 if (ret < 0) 301 goto err_mbus_win; 302 } 303 304 305 pltfm_host = sdhci_priv(host); 306 pltfm_host->priv = pxa; 307 308 clk = devm_clk_get(dev, NULL); 309 if (IS_ERR(clk)) { 310 dev_err(dev, "failed to get io clock\n"); 311 ret = PTR_ERR(clk); 312 goto err_clk_get; 313 } 314 pltfm_host->clk = clk; 315 clk_prepare_enable(clk); 316 317 /* enable 1/8V DDR capable */ 318 host->mmc->caps |= MMC_CAP_1_8V_DDR; 319 320 match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev); 321 if (match) { 322 ret = mmc_of_parse(host->mmc); 323 if (ret) 324 goto err_of_parse; 325 sdhci_get_of_property(pdev); 326 pdata = pxav3_get_mmc_pdata(dev); 327 } else if (pdata) { 328 /* on-chip device */ 329 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) 330 host->mmc->caps |= MMC_CAP_NONREMOVABLE; 331 332 /* If slot design supports 8 bit data, indicate this to MMC. */ 333 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT) 334 host->mmc->caps |= MMC_CAP_8_BIT_DATA; 335 336 if (pdata->quirks) 337 host->quirks |= pdata->quirks; 338 if (pdata->quirks2) 339 host->quirks2 |= pdata->quirks2; 340 if (pdata->host_caps) 341 host->mmc->caps |= pdata->host_caps; 342 if (pdata->host_caps2) 343 host->mmc->caps2 |= pdata->host_caps2; 344 if (pdata->pm_caps) 345 host->mmc->pm_caps |= pdata->pm_caps; 346 347 if (gpio_is_valid(pdata->ext_cd_gpio)) { 348 ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio, 349 0); 350 if (ret) { 351 dev_err(mmc_dev(host->mmc), 352 "failed to allocate card detect gpio\n"); 353 goto err_cd_req; 354 } 355 } 356 } 357 358 pm_runtime_enable(&pdev->dev); 359 pm_runtime_get_sync(&pdev->dev); 360 pm_runtime_set_autosuspend_delay(&pdev->dev, PXAV3_RPM_DELAY_MS); 361 pm_runtime_use_autosuspend(&pdev->dev); 362 pm_suspend_ignore_children(&pdev->dev, 1); 363 364 ret = sdhci_add_host(host); 365 if (ret) { 366 dev_err(&pdev->dev, "failed to add host\n"); 367 goto err_add_host; 368 } 369 370 platform_set_drvdata(pdev, host); 371 372 if (host->mmc->pm_caps & MMC_PM_KEEP_POWER) { 373 device_init_wakeup(&pdev->dev, 1); 374 host->mmc->pm_flags |= MMC_PM_WAKE_SDIO_IRQ; 375 } else { 376 device_init_wakeup(&pdev->dev, 0); 377 } 378 379 pm_runtime_put_autosuspend(&pdev->dev); 380 381 return 0; 382 383 err_add_host: 384 pm_runtime_put_sync(&pdev->dev); 385 pm_runtime_disable(&pdev->dev); 386 err_of_parse: 387 err_cd_req: 388 clk_disable_unprepare(clk); 389 err_clk_get: 390 err_mbus_win: 391 sdhci_pltfm_free(pdev); 392 return ret; 393 } 394 395 static int sdhci_pxav3_remove(struct platform_device *pdev) 396 { 397 struct sdhci_host *host = platform_get_drvdata(pdev); 398 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 399 400 pm_runtime_get_sync(&pdev->dev); 401 sdhci_remove_host(host, 1); 402 pm_runtime_disable(&pdev->dev); 403 404 clk_disable_unprepare(pltfm_host->clk); 405 406 sdhci_pltfm_free(pdev); 407 408 return 0; 409 } 410 411 #ifdef CONFIG_PM_SLEEP 412 static int sdhci_pxav3_suspend(struct device *dev) 413 { 414 int ret; 415 struct sdhci_host *host = dev_get_drvdata(dev); 416 417 pm_runtime_get_sync(dev); 418 ret = sdhci_suspend_host(host); 419 pm_runtime_mark_last_busy(dev); 420 pm_runtime_put_autosuspend(dev); 421 422 return ret; 423 } 424 425 static int sdhci_pxav3_resume(struct device *dev) 426 { 427 int ret; 428 struct sdhci_host *host = dev_get_drvdata(dev); 429 430 pm_runtime_get_sync(dev); 431 ret = sdhci_resume_host(host); 432 pm_runtime_mark_last_busy(dev); 433 pm_runtime_put_autosuspend(dev); 434 435 return ret; 436 } 437 #endif 438 439 #ifdef CONFIG_PM 440 static int sdhci_pxav3_runtime_suspend(struct device *dev) 441 { 442 struct sdhci_host *host = dev_get_drvdata(dev); 443 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 444 unsigned long flags; 445 446 if (pltfm_host->clk) { 447 spin_lock_irqsave(&host->lock, flags); 448 host->runtime_suspended = true; 449 spin_unlock_irqrestore(&host->lock, flags); 450 451 clk_disable_unprepare(pltfm_host->clk); 452 } 453 454 return 0; 455 } 456 457 static int sdhci_pxav3_runtime_resume(struct device *dev) 458 { 459 struct sdhci_host *host = dev_get_drvdata(dev); 460 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 461 unsigned long flags; 462 463 if (pltfm_host->clk) { 464 clk_prepare_enable(pltfm_host->clk); 465 466 spin_lock_irqsave(&host->lock, flags); 467 host->runtime_suspended = false; 468 spin_unlock_irqrestore(&host->lock, flags); 469 } 470 471 return 0; 472 } 473 #endif 474 475 #ifdef CONFIG_PM 476 static const struct dev_pm_ops sdhci_pxav3_pmops = { 477 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pxav3_suspend, sdhci_pxav3_resume) 478 SET_RUNTIME_PM_OPS(sdhci_pxav3_runtime_suspend, 479 sdhci_pxav3_runtime_resume, NULL) 480 }; 481 482 #define SDHCI_PXAV3_PMOPS (&sdhci_pxav3_pmops) 483 484 #else 485 #define SDHCI_PXAV3_PMOPS NULL 486 #endif 487 488 static struct platform_driver sdhci_pxav3_driver = { 489 .driver = { 490 .name = "sdhci-pxav3", 491 #ifdef CONFIG_OF 492 .of_match_table = sdhci_pxav3_of_match, 493 #endif 494 .pm = SDHCI_PXAV3_PMOPS, 495 }, 496 .probe = sdhci_pxav3_probe, 497 .remove = sdhci_pxav3_remove, 498 }; 499 500 module_platform_driver(sdhci_pxav3_driver); 501 502 MODULE_DESCRIPTION("SDHCI driver for pxav3"); 503 MODULE_AUTHOR("Marvell International Ltd."); 504 MODULE_LICENSE("GPL v2"); 505 506