1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's 4 * 5 * Copyright (C) 2015 Broadcom Corporation 6 */ 7 8 #include <linux/io.h> 9 #include <linux/mmc/host.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/bitops.h> 13 #include <linux/delay.h> 14 15 #include "sdhci-cqhci.h" 16 #include "sdhci-pltfm.h" 17 #include "cqhci.h" 18 19 #define SDHCI_VENDOR 0x78 20 #define SDHCI_VENDOR_ENHANCED_STRB 0x1 21 #define SDHCI_VENDOR_GATE_SDCLK_EN 0x2 22 23 #define BRCMSTB_MATCH_FLAGS_NO_64BIT BIT(0) 24 #define BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT BIT(1) 25 #define BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE BIT(2) 26 27 #define BRCMSTB_PRIV_FLAGS_HAS_CQE BIT(0) 28 #define BRCMSTB_PRIV_FLAGS_GATE_CLOCK BIT(1) 29 30 #define SDHCI_ARASAN_CQE_BASE_ADDR 0x200 31 32 struct sdhci_brcmstb_priv { 33 void __iomem *cfg_regs; 34 unsigned int flags; 35 struct clk *base_clk; 36 u32 base_freq_hz; 37 }; 38 39 struct brcmstb_match_priv { 40 void (*hs400es)(struct mmc_host *mmc, struct mmc_ios *ios); 41 struct sdhci_ops *ops; 42 const unsigned int flags; 43 }; 44 45 static inline void enable_clock_gating(struct sdhci_host *host) 46 { 47 u32 reg; 48 49 reg = sdhci_readl(host, SDHCI_VENDOR); 50 reg |= SDHCI_VENDOR_GATE_SDCLK_EN; 51 sdhci_writel(host, reg, SDHCI_VENDOR); 52 } 53 54 static void brcmstb_reset(struct sdhci_host *host, u8 mask) 55 { 56 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 57 struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host); 58 59 sdhci_and_cqhci_reset(host, mask); 60 61 /* Reset will clear this, so re-enable it */ 62 if (priv->flags & BRCMSTB_PRIV_FLAGS_GATE_CLOCK) 63 enable_clock_gating(host); 64 } 65 66 static void sdhci_brcmstb_hs400es(struct mmc_host *mmc, struct mmc_ios *ios) 67 { 68 struct sdhci_host *host = mmc_priv(mmc); 69 70 u32 reg; 71 72 dev_dbg(mmc_dev(mmc), "%s(): Setting HS400-Enhanced-Strobe mode\n", 73 __func__); 74 reg = readl(host->ioaddr + SDHCI_VENDOR); 75 if (ios->enhanced_strobe) 76 reg |= SDHCI_VENDOR_ENHANCED_STRB; 77 else 78 reg &= ~SDHCI_VENDOR_ENHANCED_STRB; 79 writel(reg, host->ioaddr + SDHCI_VENDOR); 80 } 81 82 static void sdhci_brcmstb_set_clock(struct sdhci_host *host, unsigned int clock) 83 { 84 u16 clk; 85 86 host->mmc->actual_clock = 0; 87 88 clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock); 89 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 90 91 if (clock == 0) 92 return; 93 94 sdhci_enable_clk(host, clk); 95 } 96 97 static void sdhci_brcmstb_set_uhs_signaling(struct sdhci_host *host, 98 unsigned int timing) 99 { 100 u16 ctrl_2; 101 102 dev_dbg(mmc_dev(host->mmc), "%s: Setting UHS signaling for %d timing\n", 103 __func__, timing); 104 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 105 /* Select Bus Speed Mode for host */ 106 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; 107 if ((timing == MMC_TIMING_MMC_HS200) || 108 (timing == MMC_TIMING_UHS_SDR104)) 109 ctrl_2 |= SDHCI_CTRL_UHS_SDR104; 110 else if (timing == MMC_TIMING_UHS_SDR12) 111 ctrl_2 |= SDHCI_CTRL_UHS_SDR12; 112 else if (timing == MMC_TIMING_SD_HS || 113 timing == MMC_TIMING_MMC_HS || 114 timing == MMC_TIMING_UHS_SDR25) 115 ctrl_2 |= SDHCI_CTRL_UHS_SDR25; 116 else if (timing == MMC_TIMING_UHS_SDR50) 117 ctrl_2 |= SDHCI_CTRL_UHS_SDR50; 118 else if ((timing == MMC_TIMING_UHS_DDR50) || 119 (timing == MMC_TIMING_MMC_DDR52)) 120 ctrl_2 |= SDHCI_CTRL_UHS_DDR50; 121 else if (timing == MMC_TIMING_MMC_HS400) 122 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */ 123 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 124 } 125 126 static void sdhci_brcmstb_dumpregs(struct mmc_host *mmc) 127 { 128 sdhci_dumpregs(mmc_priv(mmc)); 129 } 130 131 static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc) 132 { 133 struct sdhci_host *host = mmc_priv(mmc); 134 u32 reg; 135 136 reg = sdhci_readl(host, SDHCI_PRESENT_STATE); 137 while (reg & SDHCI_DATA_AVAILABLE) { 138 sdhci_readl(host, SDHCI_BUFFER); 139 reg = sdhci_readl(host, SDHCI_PRESENT_STATE); 140 } 141 142 sdhci_cqe_enable(mmc); 143 } 144 145 static const struct cqhci_host_ops sdhci_brcmstb_cqhci_ops = { 146 .enable = sdhci_brcmstb_cqe_enable, 147 .disable = sdhci_cqe_disable, 148 .dumpregs = sdhci_brcmstb_dumpregs, 149 }; 150 151 static struct sdhci_ops sdhci_brcmstb_ops = { 152 .set_clock = sdhci_set_clock, 153 .set_bus_width = sdhci_set_bus_width, 154 .reset = sdhci_reset, 155 .set_uhs_signaling = sdhci_set_uhs_signaling, 156 }; 157 158 static struct sdhci_ops sdhci_brcmstb_ops_7216 = { 159 .set_clock = sdhci_brcmstb_set_clock, 160 .set_bus_width = sdhci_set_bus_width, 161 .reset = brcmstb_reset, 162 .set_uhs_signaling = sdhci_brcmstb_set_uhs_signaling, 163 }; 164 165 static struct brcmstb_match_priv match_priv_7425 = { 166 .flags = BRCMSTB_MATCH_FLAGS_NO_64BIT | 167 BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT, 168 .ops = &sdhci_brcmstb_ops, 169 }; 170 171 static struct brcmstb_match_priv match_priv_7445 = { 172 .flags = BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT, 173 .ops = &sdhci_brcmstb_ops, 174 }; 175 176 static const struct brcmstb_match_priv match_priv_7216 = { 177 .flags = BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE, 178 .hs400es = sdhci_brcmstb_hs400es, 179 .ops = &sdhci_brcmstb_ops_7216, 180 }; 181 182 static const struct of_device_id __maybe_unused sdhci_brcm_of_match[] = { 183 { .compatible = "brcm,bcm7425-sdhci", .data = &match_priv_7425 }, 184 { .compatible = "brcm,bcm7445-sdhci", .data = &match_priv_7445 }, 185 { .compatible = "brcm,bcm7216-sdhci", .data = &match_priv_7216 }, 186 {}, 187 }; 188 189 static u32 sdhci_brcmstb_cqhci_irq(struct sdhci_host *host, u32 intmask) 190 { 191 int cmd_error = 0; 192 int data_error = 0; 193 194 if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error)) 195 return intmask; 196 197 cqhci_irq(host->mmc, intmask, cmd_error, data_error); 198 199 return 0; 200 } 201 202 static int sdhci_brcmstb_add_host(struct sdhci_host *host, 203 struct sdhci_brcmstb_priv *priv) 204 { 205 struct cqhci_host *cq_host; 206 bool dma64; 207 int ret; 208 209 if ((priv->flags & BRCMSTB_PRIV_FLAGS_HAS_CQE) == 0) 210 return sdhci_add_host(host); 211 212 dev_dbg(mmc_dev(host->mmc), "CQE is enabled\n"); 213 host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD; 214 ret = sdhci_setup_host(host); 215 if (ret) 216 return ret; 217 218 cq_host = devm_kzalloc(mmc_dev(host->mmc), 219 sizeof(*cq_host), GFP_KERNEL); 220 if (!cq_host) { 221 ret = -ENOMEM; 222 goto cleanup; 223 } 224 225 cq_host->mmio = host->ioaddr + SDHCI_ARASAN_CQE_BASE_ADDR; 226 cq_host->ops = &sdhci_brcmstb_cqhci_ops; 227 228 dma64 = host->flags & SDHCI_USE_64_BIT_DMA; 229 if (dma64) { 230 dev_dbg(mmc_dev(host->mmc), "Using 64 bit DMA\n"); 231 cq_host->caps |= CQHCI_TASK_DESC_SZ_128; 232 } 233 234 ret = cqhci_init(cq_host, host->mmc, dma64); 235 if (ret) 236 goto cleanup; 237 238 ret = __sdhci_add_host(host); 239 if (ret) 240 goto cleanup; 241 242 return 0; 243 244 cleanup: 245 sdhci_cleanup_host(host); 246 return ret; 247 } 248 249 static int sdhci_brcmstb_probe(struct platform_device *pdev) 250 { 251 const struct brcmstb_match_priv *match_priv; 252 struct sdhci_pltfm_data brcmstb_pdata; 253 struct sdhci_pltfm_host *pltfm_host; 254 const struct of_device_id *match; 255 struct sdhci_brcmstb_priv *priv; 256 u32 actual_clock_mhz; 257 struct sdhci_host *host; 258 struct resource *iomem; 259 struct clk *clk; 260 struct clk *base_clk = NULL; 261 int res; 262 263 match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node); 264 match_priv = match->data; 265 266 dev_dbg(&pdev->dev, "Probe found match for %s\n", match->compatible); 267 268 clk = devm_clk_get_optional(&pdev->dev, NULL); 269 if (IS_ERR(clk)) 270 return dev_err_probe(&pdev->dev, PTR_ERR(clk), 271 "Failed to get clock from Device Tree\n"); 272 273 res = clk_prepare_enable(clk); 274 if (res) 275 return res; 276 277 memset(&brcmstb_pdata, 0, sizeof(brcmstb_pdata)); 278 brcmstb_pdata.ops = match_priv->ops; 279 host = sdhci_pltfm_init(pdev, &brcmstb_pdata, 280 sizeof(struct sdhci_brcmstb_priv)); 281 if (IS_ERR(host)) { 282 res = PTR_ERR(host); 283 goto err_clk; 284 } 285 286 pltfm_host = sdhci_priv(host); 287 priv = sdhci_pltfm_priv(pltfm_host); 288 if (device_property_read_bool(&pdev->dev, "supports-cqe")) { 289 priv->flags |= BRCMSTB_PRIV_FLAGS_HAS_CQE; 290 match_priv->ops->irq = sdhci_brcmstb_cqhci_irq; 291 } 292 293 /* Map in the non-standard CFG registers */ 294 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 295 priv->cfg_regs = devm_ioremap_resource(&pdev->dev, iomem); 296 if (IS_ERR(priv->cfg_regs)) { 297 res = PTR_ERR(priv->cfg_regs); 298 goto err; 299 } 300 301 sdhci_get_of_property(pdev); 302 res = mmc_of_parse(host->mmc); 303 if (res) 304 goto err; 305 306 /* 307 * Automatic clock gating does not work for SD cards that may 308 * voltage switch so only enable it for non-removable devices. 309 */ 310 if ((match_priv->flags & BRCMSTB_MATCH_FLAGS_HAS_CLOCK_GATE) && 311 (host->mmc->caps & MMC_CAP_NONREMOVABLE)) 312 priv->flags |= BRCMSTB_PRIV_FLAGS_GATE_CLOCK; 313 314 /* 315 * If the chip has enhanced strobe and it's enabled, add 316 * callback 317 */ 318 if (match_priv->hs400es && 319 (host->mmc->caps2 & MMC_CAP2_HS400_ES)) 320 host->mmc_host_ops.hs400_enhanced_strobe = match_priv->hs400es; 321 322 /* 323 * Supply the existing CAPS, but clear the UHS modes. This 324 * will allow these modes to be specified by device tree 325 * properties through mmc_of_parse(). 326 */ 327 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES); 328 if (match_priv->flags & BRCMSTB_MATCH_FLAGS_NO_64BIT) 329 host->caps &= ~SDHCI_CAN_64BIT; 330 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1); 331 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 | 332 SDHCI_SUPPORT_DDR50); 333 host->quirks |= SDHCI_QUIRK_MISSING_CAPS; 334 335 if (match_priv->flags & BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT) 336 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 337 338 /* Change the base clock frequency if the DT property exists */ 339 if (device_property_read_u32(&pdev->dev, "clock-frequency", 340 &priv->base_freq_hz) != 0) 341 goto add_host; 342 343 base_clk = devm_clk_get_optional(&pdev->dev, "sdio_freq"); 344 if (IS_ERR(base_clk)) { 345 dev_warn(&pdev->dev, "Clock for \"sdio_freq\" not found\n"); 346 goto add_host; 347 } 348 349 res = clk_prepare_enable(base_clk); 350 if (res) 351 goto err; 352 353 /* set improved clock rate */ 354 clk_set_rate(base_clk, priv->base_freq_hz); 355 actual_clock_mhz = clk_get_rate(base_clk) / 1000000; 356 357 host->caps &= ~SDHCI_CLOCK_V3_BASE_MASK; 358 host->caps |= (actual_clock_mhz << SDHCI_CLOCK_BASE_SHIFT); 359 /* Disable presets because they are now incorrect */ 360 host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN; 361 362 dev_dbg(&pdev->dev, "Base Clock Frequency changed to %dMHz\n", 363 actual_clock_mhz); 364 priv->base_clk = base_clk; 365 366 add_host: 367 res = sdhci_brcmstb_add_host(host, priv); 368 if (res) 369 goto err; 370 371 pltfm_host->clk = clk; 372 return res; 373 374 err: 375 sdhci_pltfm_free(pdev); 376 err_clk: 377 clk_disable_unprepare(base_clk); 378 clk_disable_unprepare(clk); 379 return res; 380 } 381 382 static void sdhci_brcmstb_shutdown(struct platform_device *pdev) 383 { 384 sdhci_pltfm_suspend(&pdev->dev); 385 } 386 387 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match); 388 389 #ifdef CONFIG_PM_SLEEP 390 static int sdhci_brcmstb_suspend(struct device *dev) 391 { 392 struct sdhci_host *host = dev_get_drvdata(dev); 393 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 394 struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host); 395 396 clk_disable_unprepare(priv->base_clk); 397 return sdhci_pltfm_suspend(dev); 398 } 399 400 static int sdhci_brcmstb_resume(struct device *dev) 401 { 402 struct sdhci_host *host = dev_get_drvdata(dev); 403 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 404 struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host); 405 int ret; 406 407 ret = sdhci_pltfm_resume(dev); 408 if (!ret && priv->base_freq_hz) { 409 ret = clk_prepare_enable(priv->base_clk); 410 /* 411 * Note: using clk_get_rate() below as clk_get_rate() 412 * honors CLK_GET_RATE_NOCACHE attribute, but clk_set_rate() 413 * may do implicit get_rate() calls that do not honor 414 * CLK_GET_RATE_NOCACHE. 415 */ 416 if (!ret && 417 (clk_get_rate(priv->base_clk) != priv->base_freq_hz)) 418 ret = clk_set_rate(priv->base_clk, priv->base_freq_hz); 419 } 420 421 return ret; 422 } 423 #endif 424 425 static const struct dev_pm_ops sdhci_brcmstb_pmops = { 426 SET_SYSTEM_SLEEP_PM_OPS(sdhci_brcmstb_suspend, sdhci_brcmstb_resume) 427 }; 428 429 static struct platform_driver sdhci_brcmstb_driver = { 430 .driver = { 431 .name = "sdhci-brcmstb", 432 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 433 .pm = &sdhci_brcmstb_pmops, 434 .of_match_table = of_match_ptr(sdhci_brcm_of_match), 435 }, 436 .probe = sdhci_brcmstb_probe, 437 .remove = sdhci_pltfm_unregister, 438 .shutdown = sdhci_brcmstb_shutdown, 439 }; 440 441 module_platform_driver(sdhci_brcmstb_driver); 442 443 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs"); 444 MODULE_AUTHOR("Broadcom"); 445 MODULE_LICENSE("GPL v2"); 446