1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 Xilinx, Inc. 4 * CEVA AHCI SATA platform driver 5 * 6 * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov 7 */ 8 9 #include <linux/ahci_platform.h> 10 #include <linux/kernel.h> 11 #include <linux/libata.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/reset.h> 16 #include "ahci.h" 17 18 /* Vendor Specific Register Offsets */ 19 #define AHCI_VEND_PCFG 0xA4 20 #define AHCI_VEND_PPCFG 0xA8 21 #define AHCI_VEND_PP2C 0xAC 22 #define AHCI_VEND_PP3C 0xB0 23 #define AHCI_VEND_PP4C 0xB4 24 #define AHCI_VEND_PP5C 0xB8 25 #define AHCI_VEND_AXICC 0xBC 26 #define AHCI_VEND_PAXIC 0xC0 27 #define AHCI_VEND_PTC 0xC8 28 29 /* Vendor Specific Register bit definitions */ 30 #define PAXIC_ADBW_BW64 0x1 31 #define PAXIC_MAWID(i) (((i) * 2) << 4) 32 #define PAXIC_MARID(i) (((i) * 2) << 12) 33 #define PAXIC_MARIDD(i) ((((i) * 2) + 1) << 16) 34 #define PAXIC_MAWIDD(i) ((((i) * 2) + 1) << 8) 35 #define PAXIC_OTL (0x4 << 20) 36 37 /* Register bit definitions for cache control */ 38 #define AXICC_ARCA_VAL (0xF << 0) 39 #define AXICC_ARCF_VAL (0xF << 4) 40 #define AXICC_ARCH_VAL (0xF << 8) 41 #define AXICC_ARCP_VAL (0xF << 12) 42 #define AXICC_AWCFD_VAL (0xF << 16) 43 #define AXICC_AWCD_VAL (0xF << 20) 44 #define AXICC_AWCF_VAL (0xF << 24) 45 46 #define PCFG_TPSS_VAL (0x32 << 16) 47 #define PCFG_TPRS_VAL (0x2 << 12) 48 #define PCFG_PAD_VAL 0x2 49 50 #define PPCFG_TTA 0x1FFFE 51 #define PPCFG_PSSO_EN (1 << 28) 52 #define PPCFG_PSS_EN (1 << 29) 53 #define PPCFG_ESDF_EN (1 << 31) 54 55 #define PP5C_RIT 0x60216 56 #define PP5C_RCT (0x7f0 << 20) 57 58 #define PTC_RX_WM_VAL 0x40 59 #define PTC_RSVD (1 << 27) 60 61 #define PORT0_BASE 0x100 62 #define PORT1_BASE 0x180 63 64 /* Port Control Register Bit Definitions */ 65 #define PORT_SCTL_SPD_GEN3 (0x3 << 4) 66 #define PORT_SCTL_SPD_GEN2 (0x2 << 4) 67 #define PORT_SCTL_SPD_GEN1 (0x1 << 4) 68 #define PORT_SCTL_IPM (0x3 << 8) 69 70 #define PORT_BASE 0x100 71 #define PORT_OFFSET 0x80 72 #define NR_PORTS 2 73 #define DRV_NAME "ahci-ceva" 74 #define CEVA_FLAG_BROKEN_GEN2 1 75 76 static unsigned int rx_watermark = PTC_RX_WM_VAL; 77 module_param(rx_watermark, uint, 0644); 78 MODULE_PARM_DESC(rx_watermark, "RxWaterMark value (0 - 0x80)"); 79 80 struct ceva_ahci_priv { 81 struct platform_device *ahci_pdev; 82 /* Port Phy2Cfg Register */ 83 u32 pp2c[NR_PORTS]; 84 u32 pp3c[NR_PORTS]; 85 u32 pp4c[NR_PORTS]; 86 u32 pp5c[NR_PORTS]; 87 /* Axi Cache Control Register */ 88 u32 axicc; 89 bool is_cci_enabled; 90 int flags; 91 }; 92 93 static unsigned int ceva_ahci_read_id(struct ata_device *dev, 94 struct ata_taskfile *tf, __le16 *id) 95 { 96 u32 err_mask; 97 98 err_mask = ata_do_dev_read_id(dev, tf, id); 99 if (err_mask) 100 return err_mask; 101 /* 102 * Since CEVA controller does not support device sleep feature, we 103 * need to clear DEVSLP (bit 8) in word78 of the IDENTIFY DEVICE data. 104 */ 105 id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8)); 106 107 return 0; 108 } 109 110 static struct ata_port_operations ahci_ceva_ops = { 111 .inherits = &ahci_platform_ops, 112 .read_id = ceva_ahci_read_id, 113 }; 114 115 static const struct ata_port_info ahci_ceva_port_info = { 116 .flags = AHCI_FLAG_COMMON, 117 .pio_mask = ATA_PIO4, 118 .udma_mask = ATA_UDMA6, 119 .port_ops = &ahci_ceva_ops, 120 }; 121 122 static void ahci_ceva_setup(struct ahci_host_priv *hpriv) 123 { 124 void __iomem *mmio = hpriv->mmio; 125 struct ceva_ahci_priv *cevapriv = hpriv->plat_data; 126 u32 tmp; 127 int i; 128 129 /* Set AHCI Enable */ 130 tmp = readl(mmio + HOST_CTL); 131 tmp |= HOST_AHCI_EN; 132 writel(tmp, mmio + HOST_CTL); 133 134 for (i = 0; i < NR_PORTS; i++) { 135 /* TPSS TPRS scalars, CISE and Port Addr */ 136 tmp = PCFG_TPSS_VAL | PCFG_TPRS_VAL | (PCFG_PAD_VAL + i); 137 writel(tmp, mmio + AHCI_VEND_PCFG); 138 139 /* 140 * AXI Data bus width to 64 141 * Set Mem Addr Read, Write ID for data transfers 142 * Set Mem Addr Read ID, Write ID for non-data transfers 143 * Transfer limit to 72 DWord 144 */ 145 tmp = PAXIC_ADBW_BW64 | PAXIC_MAWIDD(i) | PAXIC_MARIDD(i) | 146 PAXIC_MAWID(i) | PAXIC_MARID(i) | PAXIC_OTL; 147 writel(tmp, mmio + AHCI_VEND_PAXIC); 148 149 /* Set AXI cache control register if CCi is enabled */ 150 if (cevapriv->is_cci_enabled) { 151 tmp = readl(mmio + AHCI_VEND_AXICC); 152 tmp |= AXICC_ARCA_VAL | AXICC_ARCF_VAL | 153 AXICC_ARCH_VAL | AXICC_ARCP_VAL | 154 AXICC_AWCFD_VAL | AXICC_AWCD_VAL | 155 AXICC_AWCF_VAL; 156 writel(tmp, mmio + AHCI_VEND_AXICC); 157 } 158 159 /* Port Phy Cfg register enables */ 160 tmp = PPCFG_TTA | PPCFG_PSS_EN | PPCFG_ESDF_EN; 161 writel(tmp, mmio + AHCI_VEND_PPCFG); 162 163 /* Phy Control OOB timing parameters COMINIT */ 164 writel(cevapriv->pp2c[i], mmio + AHCI_VEND_PP2C); 165 166 /* Phy Control OOB timing parameters COMWAKE */ 167 writel(cevapriv->pp3c[i], mmio + AHCI_VEND_PP3C); 168 169 /* Phy Control Burst timing setting */ 170 writel(cevapriv->pp4c[i], mmio + AHCI_VEND_PP4C); 171 172 /* Rate Change Timer and Retry Interval Timer setting */ 173 writel(cevapriv->pp5c[i], mmio + AHCI_VEND_PP5C); 174 175 /* Rx Watermark setting */ 176 tmp = rx_watermark | PTC_RSVD; 177 writel(tmp, mmio + AHCI_VEND_PTC); 178 179 /* Default to Gen 3 Speed and Gen 1 if Gen2 is broken */ 180 tmp = PORT_SCTL_SPD_GEN3 | PORT_SCTL_IPM; 181 if (cevapriv->flags & CEVA_FLAG_BROKEN_GEN2) 182 tmp = PORT_SCTL_SPD_GEN1 | PORT_SCTL_IPM; 183 writel(tmp, mmio + PORT_SCR_CTL + PORT_BASE + PORT_OFFSET * i); 184 } 185 } 186 187 static const struct scsi_host_template ahci_platform_sht = { 188 AHCI_SHT(DRV_NAME), 189 }; 190 191 static int ceva_ahci_platform_enable_resources(struct ahci_host_priv *hpriv) 192 { 193 int rc, i; 194 195 rc = ahci_platform_enable_regulators(hpriv); 196 if (rc) 197 return rc; 198 199 rc = ahci_platform_enable_clks(hpriv); 200 if (rc) 201 goto disable_regulator; 202 203 /* Assert the controller reset */ 204 rc = ahci_platform_assert_rsts(hpriv); 205 if (rc) 206 goto disable_clks; 207 208 for (i = 0; i < hpriv->nports; i++) { 209 if (ahci_ignore_port(hpriv, i)) 210 continue; 211 212 rc = phy_init(hpriv->phys[i]); 213 if (rc) 214 goto disable_rsts; 215 } 216 217 /* De-assert the controller reset */ 218 ahci_platform_deassert_rsts(hpriv); 219 220 for (i = 0; i < hpriv->nports; i++) { 221 if (ahci_ignore_port(hpriv, i)) 222 continue; 223 224 rc = phy_power_on(hpriv->phys[i]); 225 if (rc) { 226 phy_exit(hpriv->phys[i]); 227 goto disable_phys; 228 } 229 } 230 231 return 0; 232 233 disable_rsts: 234 ahci_platform_deassert_rsts(hpriv); 235 236 disable_phys: 237 while (--i >= 0) { 238 phy_power_off(hpriv->phys[i]); 239 phy_exit(hpriv->phys[i]); 240 } 241 242 disable_clks: 243 ahci_platform_disable_clks(hpriv); 244 245 disable_regulator: 246 ahci_platform_disable_regulators(hpriv); 247 248 return rc; 249 } 250 251 static int ceva_ahci_probe(struct platform_device *pdev) 252 { 253 struct device_node *np = pdev->dev.of_node; 254 struct device *dev = &pdev->dev; 255 struct ahci_host_priv *hpriv; 256 struct ceva_ahci_priv *cevapriv; 257 enum dev_dma_attr attr; 258 int rc; 259 260 cevapriv = devm_kzalloc(dev, sizeof(*cevapriv), GFP_KERNEL); 261 if (!cevapriv) 262 return -ENOMEM; 263 264 cevapriv->ahci_pdev = pdev; 265 hpriv = ahci_platform_get_resources(pdev, 0); 266 if (IS_ERR(hpriv)) 267 return PTR_ERR(hpriv); 268 269 hpriv->rsts = devm_reset_control_get_optional_exclusive(&pdev->dev, 270 NULL); 271 if (IS_ERR(hpriv->rsts)) 272 return dev_err_probe(&pdev->dev, PTR_ERR(hpriv->rsts), 273 "failed to get reset\n"); 274 275 rc = ceva_ahci_platform_enable_resources(hpriv); 276 if (rc) 277 return rc; 278 279 if (of_property_read_bool(np, "ceva,broken-gen2")) 280 cevapriv->flags = CEVA_FLAG_BROKEN_GEN2; 281 282 /* Read OOB timing value for COMINIT from device-tree */ 283 if (of_property_read_u8_array(np, "ceva,p0-cominit-params", 284 (u8 *)&cevapriv->pp2c[0], 4) < 0) { 285 dev_warn(dev, "ceva,p0-cominit-params property not defined\n"); 286 rc = -EINVAL; 287 goto disable_resources; 288 } 289 290 if (of_property_read_u8_array(np, "ceva,p1-cominit-params", 291 (u8 *)&cevapriv->pp2c[1], 4) < 0) { 292 dev_warn(dev, "ceva,p1-cominit-params property not defined\n"); 293 rc = -EINVAL; 294 goto disable_resources; 295 } 296 297 /* Read OOB timing value for COMWAKE from device-tree*/ 298 if (of_property_read_u8_array(np, "ceva,p0-comwake-params", 299 (u8 *)&cevapriv->pp3c[0], 4) < 0) { 300 dev_warn(dev, "ceva,p0-comwake-params property not defined\n"); 301 rc = -EINVAL; 302 goto disable_resources; 303 } 304 305 if (of_property_read_u8_array(np, "ceva,p1-comwake-params", 306 (u8 *)&cevapriv->pp3c[1], 4) < 0) { 307 dev_warn(dev, "ceva,p1-comwake-params property not defined\n"); 308 rc = -EINVAL; 309 goto disable_resources; 310 } 311 312 /* Read phy BURST timing value from device-tree */ 313 if (of_property_read_u8_array(np, "ceva,p0-burst-params", 314 (u8 *)&cevapriv->pp4c[0], 4) < 0) { 315 dev_warn(dev, "ceva,p0-burst-params property not defined\n"); 316 rc = -EINVAL; 317 goto disable_resources; 318 } 319 320 if (of_property_read_u8_array(np, "ceva,p1-burst-params", 321 (u8 *)&cevapriv->pp4c[1], 4) < 0) { 322 dev_warn(dev, "ceva,p1-burst-params property not defined\n"); 323 rc = -EINVAL; 324 goto disable_resources; 325 } 326 327 /* Read phy RETRY interval timing value from device-tree */ 328 if (of_property_read_u16_array(np, "ceva,p0-retry-params", 329 (u16 *)&cevapriv->pp5c[0], 2) < 0) { 330 dev_warn(dev, "ceva,p0-retry-params property not defined\n"); 331 rc = -EINVAL; 332 goto disable_resources; 333 } 334 335 if (of_property_read_u16_array(np, "ceva,p1-retry-params", 336 (u16 *)&cevapriv->pp5c[1], 2) < 0) { 337 dev_warn(dev, "ceva,p1-retry-params property not defined\n"); 338 rc = -EINVAL; 339 goto disable_resources; 340 } 341 342 /* 343 * Check if CCI is enabled for SATA. The DEV_DMA_COHERENT is returned 344 * if CCI is enabled, so check for DEV_DMA_COHERENT. 345 */ 346 attr = device_get_dma_attr(dev); 347 cevapriv->is_cci_enabled = (attr == DEV_DMA_COHERENT); 348 349 hpriv->plat_data = cevapriv; 350 351 /* CEVA specific initialization */ 352 ahci_ceva_setup(hpriv); 353 354 rc = ahci_platform_init_host(pdev, hpriv, &ahci_ceva_port_info, 355 &ahci_platform_sht); 356 if (rc) 357 goto disable_resources; 358 359 return 0; 360 361 disable_resources: 362 ahci_platform_disable_resources(hpriv); 363 return rc; 364 } 365 366 static int __maybe_unused ceva_ahci_suspend(struct device *dev) 367 { 368 return ahci_platform_suspend(dev); 369 } 370 371 static int __maybe_unused ceva_ahci_resume(struct device *dev) 372 { 373 struct ata_host *host = dev_get_drvdata(dev); 374 struct ahci_host_priv *hpriv = host->private_data; 375 int rc; 376 377 rc = ceva_ahci_platform_enable_resources(hpriv); 378 if (rc) 379 return rc; 380 381 /* Configure CEVA specific config before resuming HBA */ 382 ahci_ceva_setup(hpriv); 383 384 rc = ahci_platform_resume_host(dev); 385 if (rc) 386 goto disable_resources; 387 388 /* We resumed so update PM runtime state */ 389 pm_runtime_disable(dev); 390 pm_runtime_set_active(dev); 391 pm_runtime_enable(dev); 392 393 return 0; 394 395 disable_resources: 396 ahci_platform_disable_resources(hpriv); 397 398 return rc; 399 } 400 401 static SIMPLE_DEV_PM_OPS(ahci_ceva_pm_ops, ceva_ahci_suspend, ceva_ahci_resume); 402 403 static const struct of_device_id ceva_ahci_of_match[] = { 404 { .compatible = "ceva,ahci-1v84" }, 405 { /* sentinel */ } 406 }; 407 MODULE_DEVICE_TABLE(of, ceva_ahci_of_match); 408 409 static struct platform_driver ceva_ahci_driver = { 410 .probe = ceva_ahci_probe, 411 .remove = ata_platform_remove_one, 412 .driver = { 413 .name = DRV_NAME, 414 .of_match_table = ceva_ahci_of_match, 415 .pm = &ahci_ceva_pm_ops, 416 }, 417 }; 418 module_platform_driver(ceva_ahci_driver); 419 420 MODULE_DESCRIPTION("CEVA AHCI SATA platform driver"); 421 MODULE_AUTHOR("Xilinx Inc."); 422 MODULE_LICENSE("GPL v2"); 423