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_device.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 struct reset_control *rst; 92 }; 93 94 static unsigned int ceva_ahci_read_id(struct ata_device *dev, 95 struct ata_taskfile *tf, u16 *id) 96 { 97 u32 err_mask; 98 99 err_mask = ata_do_dev_read_id(dev, tf, id); 100 if (err_mask) 101 return err_mask; 102 /* 103 * Since CEVA controller does not support device sleep feature, we 104 * need to clear DEVSLP (bit 8) in word78 of the IDENTIFY DEVICE data. 105 */ 106 id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8)); 107 108 return 0; 109 } 110 111 static struct ata_port_operations ahci_ceva_ops = { 112 .inherits = &ahci_platform_ops, 113 .read_id = ceva_ahci_read_id, 114 }; 115 116 static const struct ata_port_info ahci_ceva_port_info = { 117 .flags = AHCI_FLAG_COMMON, 118 .pio_mask = ATA_PIO4, 119 .udma_mask = ATA_UDMA6, 120 .port_ops = &ahci_ceva_ops, 121 }; 122 123 static void ahci_ceva_setup(struct ahci_host_priv *hpriv) 124 { 125 void __iomem *mmio = hpriv->mmio; 126 struct ceva_ahci_priv *cevapriv = hpriv->plat_data; 127 u32 tmp; 128 int i; 129 130 /* Set AHCI Enable */ 131 tmp = readl(mmio + HOST_CTL); 132 tmp |= HOST_AHCI_EN; 133 writel(tmp, mmio + HOST_CTL); 134 135 for (i = 0; i < NR_PORTS; i++) { 136 /* TPSS TPRS scalars, CISE and Port Addr */ 137 tmp = PCFG_TPSS_VAL | PCFG_TPRS_VAL | (PCFG_PAD_VAL + i); 138 writel(tmp, mmio + AHCI_VEND_PCFG); 139 140 /* 141 * AXI Data bus width to 64 142 * Set Mem Addr Read, Write ID for data transfers 143 * Set Mem Addr Read ID, Write ID for non-data transfers 144 * Transfer limit to 72 DWord 145 */ 146 tmp = PAXIC_ADBW_BW64 | PAXIC_MAWIDD(i) | PAXIC_MARIDD(i) | 147 PAXIC_MAWID(i) | PAXIC_MARID(i) | PAXIC_OTL; 148 writel(tmp, mmio + AHCI_VEND_PAXIC); 149 150 /* Set AXI cache control register if CCi is enabled */ 151 if (cevapriv->is_cci_enabled) { 152 tmp = readl(mmio + AHCI_VEND_AXICC); 153 tmp |= AXICC_ARCA_VAL | AXICC_ARCF_VAL | 154 AXICC_ARCH_VAL | AXICC_ARCP_VAL | 155 AXICC_AWCFD_VAL | AXICC_AWCD_VAL | 156 AXICC_AWCF_VAL; 157 writel(tmp, mmio + AHCI_VEND_AXICC); 158 } 159 160 /* Port Phy Cfg register enables */ 161 tmp = PPCFG_TTA | PPCFG_PSS_EN | PPCFG_ESDF_EN; 162 writel(tmp, mmio + AHCI_VEND_PPCFG); 163 164 /* Phy Control OOB timing parameters COMINIT */ 165 writel(cevapriv->pp2c[i], mmio + AHCI_VEND_PP2C); 166 167 /* Phy Control OOB timing parameters COMWAKE */ 168 writel(cevapriv->pp3c[i], mmio + AHCI_VEND_PP3C); 169 170 /* Phy Control Burst timing setting */ 171 writel(cevapriv->pp4c[i], mmio + AHCI_VEND_PP4C); 172 173 /* Rate Change Timer and Retry Interval Timer setting */ 174 writel(cevapriv->pp5c[i], mmio + AHCI_VEND_PP5C); 175 176 /* Rx Watermark setting */ 177 tmp = rx_watermark | PTC_RSVD; 178 writel(tmp, mmio + AHCI_VEND_PTC); 179 180 /* Default to Gen 3 Speed and Gen 1 if Gen2 is broken */ 181 tmp = PORT_SCTL_SPD_GEN3 | PORT_SCTL_IPM; 182 if (cevapriv->flags & CEVA_FLAG_BROKEN_GEN2) 183 tmp = PORT_SCTL_SPD_GEN1 | PORT_SCTL_IPM; 184 writel(tmp, mmio + PORT_SCR_CTL + PORT_BASE + PORT_OFFSET * i); 185 } 186 } 187 188 static struct scsi_host_template ahci_platform_sht = { 189 AHCI_SHT(DRV_NAME), 190 }; 191 192 static int ceva_ahci_probe(struct platform_device *pdev) 193 { 194 struct device_node *np = pdev->dev.of_node; 195 struct device *dev = &pdev->dev; 196 struct ahci_host_priv *hpriv; 197 struct ceva_ahci_priv *cevapriv; 198 enum dev_dma_attr attr; 199 int rc; 200 201 cevapriv = devm_kzalloc(dev, sizeof(*cevapriv), GFP_KERNEL); 202 if (!cevapriv) 203 return -ENOMEM; 204 205 cevapriv->ahci_pdev = pdev; 206 207 cevapriv->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, 208 NULL); 209 if (IS_ERR(cevapriv->rst)) 210 dev_err_probe(&pdev->dev, PTR_ERR(cevapriv->rst), 211 "failed to get reset\n"); 212 213 hpriv = ahci_platform_get_resources(pdev, 0); 214 if (IS_ERR(hpriv)) 215 return PTR_ERR(hpriv); 216 217 if (!cevapriv->rst) { 218 rc = ahci_platform_enable_resources(hpriv); 219 if (rc) 220 return rc; 221 } else { 222 int i; 223 224 rc = ahci_platform_enable_clks(hpriv); 225 if (rc) 226 return rc; 227 /* Assert the controller reset */ 228 reset_control_assert(cevapriv->rst); 229 230 for (i = 0; i < hpriv->nports; i++) { 231 rc = phy_init(hpriv->phys[i]); 232 if (rc) 233 return rc; 234 } 235 236 /* De-assert the controller reset */ 237 reset_control_deassert(cevapriv->rst); 238 239 for (i = 0; i < hpriv->nports; i++) { 240 rc = phy_power_on(hpriv->phys[i]); 241 if (rc) { 242 phy_exit(hpriv->phys[i]); 243 return rc; 244 } 245 } 246 } 247 248 if (of_property_read_bool(np, "ceva,broken-gen2")) 249 cevapriv->flags = CEVA_FLAG_BROKEN_GEN2; 250 251 /* Read OOB timing value for COMINIT from device-tree */ 252 if (of_property_read_u8_array(np, "ceva,p0-cominit-params", 253 (u8 *)&cevapriv->pp2c[0], 4) < 0) { 254 dev_warn(dev, "ceva,p0-cominit-params property not defined\n"); 255 return -EINVAL; 256 } 257 258 if (of_property_read_u8_array(np, "ceva,p1-cominit-params", 259 (u8 *)&cevapriv->pp2c[1], 4) < 0) { 260 dev_warn(dev, "ceva,p1-cominit-params property not defined\n"); 261 return -EINVAL; 262 } 263 264 /* Read OOB timing value for COMWAKE from device-tree*/ 265 if (of_property_read_u8_array(np, "ceva,p0-comwake-params", 266 (u8 *)&cevapriv->pp3c[0], 4) < 0) { 267 dev_warn(dev, "ceva,p0-comwake-params property not defined\n"); 268 return -EINVAL; 269 } 270 271 if (of_property_read_u8_array(np, "ceva,p1-comwake-params", 272 (u8 *)&cevapriv->pp3c[1], 4) < 0) { 273 dev_warn(dev, "ceva,p1-comwake-params property not defined\n"); 274 return -EINVAL; 275 } 276 277 /* Read phy BURST timing value from device-tree */ 278 if (of_property_read_u8_array(np, "ceva,p0-burst-params", 279 (u8 *)&cevapriv->pp4c[0], 4) < 0) { 280 dev_warn(dev, "ceva,p0-burst-params property not defined\n"); 281 return -EINVAL; 282 } 283 284 if (of_property_read_u8_array(np, "ceva,p1-burst-params", 285 (u8 *)&cevapriv->pp4c[1], 4) < 0) { 286 dev_warn(dev, "ceva,p1-burst-params property not defined\n"); 287 return -EINVAL; 288 } 289 290 /* Read phy RETRY interval timing value from device-tree */ 291 if (of_property_read_u16_array(np, "ceva,p0-retry-params", 292 (u16 *)&cevapriv->pp5c[0], 2) < 0) { 293 dev_warn(dev, "ceva,p0-retry-params property not defined\n"); 294 return -EINVAL; 295 } 296 297 if (of_property_read_u16_array(np, "ceva,p1-retry-params", 298 (u16 *)&cevapriv->pp5c[1], 2) < 0) { 299 dev_warn(dev, "ceva,p1-retry-params property not defined\n"); 300 return -EINVAL; 301 } 302 303 /* 304 * Check if CCI is enabled for SATA. The DEV_DMA_COHERENT is returned 305 * if CCI is enabled, so check for DEV_DMA_COHERENT. 306 */ 307 attr = device_get_dma_attr(dev); 308 cevapriv->is_cci_enabled = (attr == DEV_DMA_COHERENT); 309 310 hpriv->plat_data = cevapriv; 311 312 /* CEVA specific initialization */ 313 ahci_ceva_setup(hpriv); 314 315 rc = ahci_platform_init_host(pdev, hpriv, &ahci_ceva_port_info, 316 &ahci_platform_sht); 317 if (rc) 318 goto disable_resources; 319 320 return 0; 321 322 disable_resources: 323 ahci_platform_disable_resources(hpriv); 324 return rc; 325 } 326 327 static int __maybe_unused ceva_ahci_suspend(struct device *dev) 328 { 329 return ahci_platform_suspend(dev); 330 } 331 332 static int __maybe_unused ceva_ahci_resume(struct device *dev) 333 { 334 struct ata_host *host = dev_get_drvdata(dev); 335 struct ahci_host_priv *hpriv = host->private_data; 336 int rc; 337 338 rc = ahci_platform_enable_resources(hpriv); 339 if (rc) 340 return rc; 341 342 /* Configure CEVA specific config before resuming HBA */ 343 ahci_ceva_setup(hpriv); 344 345 rc = ahci_platform_resume_host(dev); 346 if (rc) 347 goto disable_resources; 348 349 /* We resumed so update PM runtime state */ 350 pm_runtime_disable(dev); 351 pm_runtime_set_active(dev); 352 pm_runtime_enable(dev); 353 354 return 0; 355 356 disable_resources: 357 ahci_platform_disable_resources(hpriv); 358 359 return rc; 360 } 361 362 static SIMPLE_DEV_PM_OPS(ahci_ceva_pm_ops, ceva_ahci_suspend, ceva_ahci_resume); 363 364 static const struct of_device_id ceva_ahci_of_match[] = { 365 { .compatible = "ceva,ahci-1v84" }, 366 {}, 367 }; 368 MODULE_DEVICE_TABLE(of, ceva_ahci_of_match); 369 370 static struct platform_driver ceva_ahci_driver = { 371 .probe = ceva_ahci_probe, 372 .remove = ata_platform_remove_one, 373 .driver = { 374 .name = DRV_NAME, 375 .of_match_table = ceva_ahci_of_match, 376 .pm = &ahci_ceva_pm_ops, 377 }, 378 }; 379 module_platform_driver(ceva_ahci_driver); 380 381 MODULE_DESCRIPTION("CEVA AHCI SATA platform driver"); 382 MODULE_AUTHOR("Xilinx Inc."); 383 MODULE_LICENSE("GPL v2"); 384