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-pltfm.h" 16 #include "cqhci.h" 17 18 #define SDHCI_VENDOR 0x78 19 #define SDHCI_VENDOR_ENHANCED_STRB 0x1 20 21 #define BRCMSTB_PRIV_FLAGS_NO_64BIT BIT(0) 22 #define BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT BIT(1) 23 24 #define SDHCI_ARASAN_CQE_BASE_ADDR 0x200 25 26 struct sdhci_brcmstb_priv { 27 void __iomem *cfg_regs; 28 bool has_cqe; 29 }; 30 31 struct brcmstb_match_priv { 32 void (*hs400es)(struct mmc_host *mmc, struct mmc_ios *ios); 33 struct sdhci_ops *ops; 34 unsigned int flags; 35 }; 36 37 static void sdhci_brcmstb_hs400es(struct mmc_host *mmc, struct mmc_ios *ios) 38 { 39 struct sdhci_host *host = mmc_priv(mmc); 40 41 u32 reg; 42 43 dev_dbg(mmc_dev(mmc), "%s(): Setting HS400-Enhanced-Strobe mode\n", 44 __func__); 45 reg = readl(host->ioaddr + SDHCI_VENDOR); 46 if (ios->enhanced_strobe) 47 reg |= SDHCI_VENDOR_ENHANCED_STRB; 48 else 49 reg &= ~SDHCI_VENDOR_ENHANCED_STRB; 50 writel(reg, host->ioaddr + SDHCI_VENDOR); 51 } 52 53 static void sdhci_brcmstb_set_clock(struct sdhci_host *host, unsigned int clock) 54 { 55 u16 clk; 56 57 host->mmc->actual_clock = 0; 58 59 clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock); 60 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); 61 62 if (clock == 0) 63 return; 64 65 sdhci_enable_clk(host, clk); 66 } 67 68 static void sdhci_brcmstb_set_uhs_signaling(struct sdhci_host *host, 69 unsigned int timing) 70 { 71 u16 ctrl_2; 72 73 dev_dbg(mmc_dev(host->mmc), "%s: Setting UHS signaling for %d timing\n", 74 __func__, timing); 75 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); 76 /* Select Bus Speed Mode for host */ 77 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; 78 if ((timing == MMC_TIMING_MMC_HS200) || 79 (timing == MMC_TIMING_UHS_SDR104)) 80 ctrl_2 |= SDHCI_CTRL_UHS_SDR104; 81 else if (timing == MMC_TIMING_UHS_SDR12) 82 ctrl_2 |= SDHCI_CTRL_UHS_SDR12; 83 else if (timing == MMC_TIMING_SD_HS || 84 timing == MMC_TIMING_MMC_HS || 85 timing == MMC_TIMING_UHS_SDR25) 86 ctrl_2 |= SDHCI_CTRL_UHS_SDR25; 87 else if (timing == MMC_TIMING_UHS_SDR50) 88 ctrl_2 |= SDHCI_CTRL_UHS_SDR50; 89 else if ((timing == MMC_TIMING_UHS_DDR50) || 90 (timing == MMC_TIMING_MMC_DDR52)) 91 ctrl_2 |= SDHCI_CTRL_UHS_DDR50; 92 else if (timing == MMC_TIMING_MMC_HS400) 93 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */ 94 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); 95 } 96 97 static void sdhci_brcmstb_dumpregs(struct mmc_host *mmc) 98 { 99 sdhci_dumpregs(mmc_priv(mmc)); 100 } 101 102 static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc) 103 { 104 struct sdhci_host *host = mmc_priv(mmc); 105 u32 reg; 106 107 reg = sdhci_readl(host, SDHCI_PRESENT_STATE); 108 while (reg & SDHCI_DATA_AVAILABLE) { 109 sdhci_readl(host, SDHCI_BUFFER); 110 reg = sdhci_readl(host, SDHCI_PRESENT_STATE); 111 } 112 113 sdhci_cqe_enable(mmc); 114 } 115 116 static const struct cqhci_host_ops sdhci_brcmstb_cqhci_ops = { 117 .enable = sdhci_brcmstb_cqe_enable, 118 .disable = sdhci_cqe_disable, 119 .dumpregs = sdhci_brcmstb_dumpregs, 120 }; 121 122 static struct sdhci_ops sdhci_brcmstb_ops = { 123 .set_clock = sdhci_set_clock, 124 .set_bus_width = sdhci_set_bus_width, 125 .reset = sdhci_reset, 126 .set_uhs_signaling = sdhci_set_uhs_signaling, 127 }; 128 129 static struct sdhci_ops sdhci_brcmstb_ops_7216 = { 130 .set_clock = sdhci_brcmstb_set_clock, 131 .set_bus_width = sdhci_set_bus_width, 132 .reset = sdhci_reset, 133 .set_uhs_signaling = sdhci_brcmstb_set_uhs_signaling, 134 }; 135 136 static struct brcmstb_match_priv match_priv_7425 = { 137 .flags = BRCMSTB_PRIV_FLAGS_NO_64BIT | 138 BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT, 139 .ops = &sdhci_brcmstb_ops, 140 }; 141 142 static struct brcmstb_match_priv match_priv_7445 = { 143 .flags = BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT, 144 .ops = &sdhci_brcmstb_ops, 145 }; 146 147 static const struct brcmstb_match_priv match_priv_7216 = { 148 .hs400es = sdhci_brcmstb_hs400es, 149 .ops = &sdhci_brcmstb_ops_7216, 150 }; 151 152 static const struct of_device_id sdhci_brcm_of_match[] = { 153 { .compatible = "brcm,bcm7425-sdhci", .data = &match_priv_7425 }, 154 { .compatible = "brcm,bcm7445-sdhci", .data = &match_priv_7445 }, 155 { .compatible = "brcm,bcm7216-sdhci", .data = &match_priv_7216 }, 156 {}, 157 }; 158 159 static u32 sdhci_brcmstb_cqhci_irq(struct sdhci_host *host, u32 intmask) 160 { 161 int cmd_error = 0; 162 int data_error = 0; 163 164 if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error)) 165 return intmask; 166 167 cqhci_irq(host->mmc, intmask, cmd_error, data_error); 168 169 return 0; 170 } 171 172 static int sdhci_brcmstb_add_host(struct sdhci_host *host, 173 struct sdhci_brcmstb_priv *priv) 174 { 175 struct cqhci_host *cq_host; 176 bool dma64; 177 int ret; 178 179 if (!priv->has_cqe) 180 return sdhci_add_host(host); 181 182 dev_dbg(mmc_dev(host->mmc), "CQE is enabled\n"); 183 host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD; 184 ret = sdhci_setup_host(host); 185 if (ret) 186 return ret; 187 188 cq_host = devm_kzalloc(mmc_dev(host->mmc), 189 sizeof(*cq_host), GFP_KERNEL); 190 if (!cq_host) { 191 ret = -ENOMEM; 192 goto cleanup; 193 } 194 195 cq_host->mmio = host->ioaddr + SDHCI_ARASAN_CQE_BASE_ADDR; 196 cq_host->ops = &sdhci_brcmstb_cqhci_ops; 197 198 dma64 = host->flags & SDHCI_USE_64_BIT_DMA; 199 if (dma64) { 200 dev_dbg(mmc_dev(host->mmc), "Using 64 bit DMA\n"); 201 cq_host->caps |= CQHCI_TASK_DESC_SZ_128; 202 cq_host->quirks |= CQHCI_QUIRK_SHORT_TXFR_DESC_SZ; 203 } 204 205 ret = cqhci_init(cq_host, host->mmc, dma64); 206 if (ret) 207 goto cleanup; 208 209 ret = __sdhci_add_host(host); 210 if (ret) 211 goto cleanup; 212 213 return 0; 214 215 cleanup: 216 sdhci_cleanup_host(host); 217 return ret; 218 } 219 220 static int sdhci_brcmstb_probe(struct platform_device *pdev) 221 { 222 const struct brcmstb_match_priv *match_priv; 223 struct sdhci_pltfm_data brcmstb_pdata; 224 struct sdhci_pltfm_host *pltfm_host; 225 const struct of_device_id *match; 226 struct sdhci_brcmstb_priv *priv; 227 struct sdhci_host *host; 228 struct resource *iomem; 229 bool has_cqe = false; 230 struct clk *clk; 231 int res; 232 233 match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node); 234 match_priv = match->data; 235 236 dev_dbg(&pdev->dev, "Probe found match for %s\n", match->compatible); 237 238 clk = devm_clk_get(&pdev->dev, NULL); 239 if (IS_ERR(clk)) { 240 if (PTR_ERR(clk) == -EPROBE_DEFER) 241 return -EPROBE_DEFER; 242 dev_err(&pdev->dev, "Clock not found in Device Tree\n"); 243 clk = NULL; 244 } 245 res = clk_prepare_enable(clk); 246 if (res) 247 return res; 248 249 memset(&brcmstb_pdata, 0, sizeof(brcmstb_pdata)); 250 if (device_property_read_bool(&pdev->dev, "supports-cqe")) { 251 has_cqe = true; 252 match_priv->ops->irq = sdhci_brcmstb_cqhci_irq; 253 } 254 brcmstb_pdata.ops = match_priv->ops; 255 host = sdhci_pltfm_init(pdev, &brcmstb_pdata, 256 sizeof(struct sdhci_brcmstb_priv)); 257 if (IS_ERR(host)) { 258 res = PTR_ERR(host); 259 goto err_clk; 260 } 261 262 pltfm_host = sdhci_priv(host); 263 priv = sdhci_pltfm_priv(pltfm_host); 264 priv->has_cqe = has_cqe; 265 266 /* Map in the non-standard CFG registers */ 267 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 268 priv->cfg_regs = devm_ioremap_resource(&pdev->dev, iomem); 269 if (IS_ERR(priv->cfg_regs)) { 270 res = PTR_ERR(priv->cfg_regs); 271 goto err; 272 } 273 274 sdhci_get_of_property(pdev); 275 res = mmc_of_parse(host->mmc); 276 if (res) 277 goto err; 278 279 /* 280 * If the chip has enhanced strobe and it's enabled, add 281 * callback 282 */ 283 if (match_priv->hs400es && 284 (host->mmc->caps2 & MMC_CAP2_HS400_ES)) 285 host->mmc_host_ops.hs400_enhanced_strobe = match_priv->hs400es; 286 287 /* 288 * Supply the existing CAPS, but clear the UHS modes. This 289 * will allow these modes to be specified by device tree 290 * properties through mmc_of_parse(). 291 */ 292 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES); 293 if (match_priv->flags & BRCMSTB_PRIV_FLAGS_NO_64BIT) 294 host->caps &= ~SDHCI_CAN_64BIT; 295 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1); 296 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 | 297 SDHCI_SUPPORT_DDR50); 298 host->quirks |= SDHCI_QUIRK_MISSING_CAPS; 299 300 if (match_priv->flags & BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT) 301 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 302 303 res = sdhci_brcmstb_add_host(host, priv); 304 if (res) 305 goto err; 306 307 pltfm_host->clk = clk; 308 return res; 309 310 err: 311 sdhci_pltfm_free(pdev); 312 err_clk: 313 clk_disable_unprepare(clk); 314 return res; 315 } 316 317 static void sdhci_brcmstb_shutdown(struct platform_device *pdev) 318 { 319 int ret; 320 321 ret = sdhci_pltfm_unregister(pdev); 322 if (ret) 323 dev_err(&pdev->dev, "failed to shutdown\n"); 324 } 325 326 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match); 327 328 static struct platform_driver sdhci_brcmstb_driver = { 329 .driver = { 330 .name = "sdhci-brcmstb", 331 .pm = &sdhci_pltfm_pmops, 332 .of_match_table = of_match_ptr(sdhci_brcm_of_match), 333 }, 334 .probe = sdhci_brcmstb_probe, 335 .remove = sdhci_pltfm_unregister, 336 .shutdown = sdhci_brcmstb_shutdown, 337 }; 338 339 module_platform_driver(sdhci_brcmstb_driver); 340 341 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs"); 342 MODULE_AUTHOR("Broadcom"); 343 MODULE_LICENSE("GPL v2"); 344