1 /* 2 * AppliedMicro X-Gene SoC SATA Host Controller Driver 3 * 4 * Copyright (c) 2014, Applied Micro Circuits Corporation 5 * Author: Loc Ho <lho@apm.com> 6 * Tuan Phan <tphan@apm.com> 7 * Suman Tripathi <stripathi@apm.com> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program. If not, see <http://www.gnu.org/licenses/>. 21 * 22 * NOTE: PM support is not currently available. 23 * 24 */ 25 #include <linux/acpi.h> 26 #include <linux/module.h> 27 #include <linux/platform_device.h> 28 #include <linux/ahci_platform.h> 29 #include <linux/of_address.h> 30 #include <linux/of_device.h> 31 #include <linux/of_irq.h> 32 #include <linux/phy/phy.h> 33 #include "ahci.h" 34 35 #define DRV_NAME "xgene-ahci" 36 37 /* Max # of disk per a controller */ 38 #define MAX_AHCI_CHN_PERCTR 2 39 40 /* MUX CSR */ 41 #define SATA_ENET_CONFIG_REG 0x00000000 42 #define CFG_SATA_ENET_SELECT_MASK 0x00000001 43 44 /* SATA core host controller CSR */ 45 #define SLVRDERRATTRIBUTES 0x00000000 46 #define SLVWRERRATTRIBUTES 0x00000004 47 #define MSTRDERRATTRIBUTES 0x00000008 48 #define MSTWRERRATTRIBUTES 0x0000000c 49 #define BUSCTLREG 0x00000014 50 #define IOFMSTRWAUX 0x00000018 51 #define INTSTATUSMASK 0x0000002c 52 #define ERRINTSTATUS 0x00000030 53 #define ERRINTSTATUSMASK 0x00000034 54 55 /* SATA host AHCI CSR */ 56 #define PORTCFG 0x000000a4 57 #define PORTADDR_SET(dst, src) \ 58 (((dst) & ~0x0000003f) | (((u32)(src)) & 0x0000003f)) 59 #define PORTPHY1CFG 0x000000a8 60 #define PORTPHY1CFG_FRCPHYRDY_SET(dst, src) \ 61 (((dst) & ~0x00100000) | (((u32)(src) << 0x14) & 0x00100000)) 62 #define PORTPHY2CFG 0x000000ac 63 #define PORTPHY3CFG 0x000000b0 64 #define PORTPHY4CFG 0x000000b4 65 #define PORTPHY5CFG 0x000000b8 66 #define SCTL0 0x0000012C 67 #define PORTPHY5CFG_RTCHG_SET(dst, src) \ 68 (((dst) & ~0xfff00000) | (((u32)(src) << 0x14) & 0xfff00000)) 69 #define PORTAXICFG_EN_CONTEXT_SET(dst, src) \ 70 (((dst) & ~0x01000000) | (((u32)(src) << 0x18) & 0x01000000)) 71 #define PORTAXICFG 0x000000bc 72 #define PORTAXICFG_OUTTRANS_SET(dst, src) \ 73 (((dst) & ~0x00f00000) | (((u32)(src) << 0x14) & 0x00f00000)) 74 #define PORTRANSCFG 0x000000c8 75 #define PORTRANSCFG_RXWM_SET(dst, src) \ 76 (((dst) & ~0x0000007f) | (((u32)(src)) & 0x0000007f)) 77 78 /* SATA host controller AXI CSR */ 79 #define INT_SLV_TMOMASK 0x00000010 80 81 /* SATA diagnostic CSR */ 82 #define CFG_MEM_RAM_SHUTDOWN 0x00000070 83 #define BLOCK_MEM_RDY 0x00000074 84 85 /* Max retry for link down */ 86 #define MAX_LINK_DOWN_RETRY 3 87 88 enum xgene_ahci_version { 89 XGENE_AHCI_V1 = 1, 90 XGENE_AHCI_V2, 91 }; 92 93 struct xgene_ahci_context { 94 struct ahci_host_priv *hpriv; 95 struct device *dev; 96 u8 last_cmd[MAX_AHCI_CHN_PERCTR]; /* tracking the last command issued*/ 97 u32 class[MAX_AHCI_CHN_PERCTR]; /* tracking the class of device */ 98 void __iomem *csr_core; /* Core CSR address of IP */ 99 void __iomem *csr_diag; /* Diag CSR address of IP */ 100 void __iomem *csr_axi; /* AXI CSR address of IP */ 101 void __iomem *csr_mux; /* MUX CSR address of IP */ 102 }; 103 104 static int xgene_ahci_init_memram(struct xgene_ahci_context *ctx) 105 { 106 dev_dbg(ctx->dev, "Release memory from shutdown\n"); 107 writel(0x0, ctx->csr_diag + CFG_MEM_RAM_SHUTDOWN); 108 readl(ctx->csr_diag + CFG_MEM_RAM_SHUTDOWN); /* Force a barrier */ 109 msleep(1); /* reset may take up to 1ms */ 110 if (readl(ctx->csr_diag + BLOCK_MEM_RDY) != 0xFFFFFFFF) { 111 dev_err(ctx->dev, "failed to release memory from shutdown\n"); 112 return -ENODEV; 113 } 114 return 0; 115 } 116 117 /** 118 * xgene_ahci_poll_reg_val- Poll a register on a specific value. 119 * @ap : ATA port of interest. 120 * @reg : Register of interest. 121 * @val : Value to be attained. 122 * @interval : waiting interval for polling. 123 * @timeout : timeout for achieving the value. 124 */ 125 static int xgene_ahci_poll_reg_val(struct ata_port *ap, 126 void __iomem *reg, unsigned 127 int val, unsigned long interval, 128 unsigned long timeout) 129 { 130 unsigned long deadline; 131 unsigned int tmp; 132 133 tmp = ioread32(reg); 134 deadline = ata_deadline(jiffies, timeout); 135 136 while (tmp != val && time_before(jiffies, deadline)) { 137 ata_msleep(ap, interval); 138 tmp = ioread32(reg); 139 } 140 141 return tmp; 142 } 143 144 /** 145 * xgene_ahci_restart_engine - Restart the dma engine. 146 * @ap : ATA port of interest 147 * 148 * Waits for completion of multiple commands and restarts 149 * the DMA engine inside the controller. 150 */ 151 static int xgene_ahci_restart_engine(struct ata_port *ap) 152 { 153 struct ahci_host_priv *hpriv = ap->host->private_data; 154 struct ahci_port_priv *pp = ap->private_data; 155 void __iomem *port_mmio = ahci_port_base(ap); 156 u32 fbs; 157 158 /* 159 * In case of PMP multiple IDENTIFY DEVICE commands can be 160 * issued inside PxCI. So need to poll PxCI for the 161 * completion of outstanding IDENTIFY DEVICE commands before 162 * we restart the DMA engine. 163 */ 164 if (xgene_ahci_poll_reg_val(ap, port_mmio + 165 PORT_CMD_ISSUE, 0x0, 1, 100)) 166 return -EBUSY; 167 168 hpriv->stop_engine(ap); 169 ahci_start_fis_rx(ap); 170 171 /* 172 * Enable the PxFBS.FBS_EN bit as it 173 * gets cleared due to stopping the engine. 174 */ 175 if (pp->fbs_supported) { 176 fbs = readl(port_mmio + PORT_FBS); 177 writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS); 178 fbs = readl(port_mmio + PORT_FBS); 179 } 180 181 hpriv->start_engine(ap); 182 183 return 0; 184 } 185 186 /** 187 * xgene_ahci_qc_issue - Issue commands to the device 188 * @qc: Command to issue 189 * 190 * Due to Hardware errata for IDENTIFY DEVICE command, the controller cannot 191 * clear the BSY bit after receiving the PIO setup FIS. This results in the dma 192 * state machine goes into the CMFatalErrorUpdate state and locks up. By 193 * restarting the dma engine, it removes the controller out of lock up state. 194 * 195 * Due to H/W errata, the controller is unable to save the PMP 196 * field fetched from command header before sending the H2D FIS. 197 * When the device returns the PMP port field in the D2H FIS, there is 198 * a mismatch and results in command completion failure. The 199 * workaround is to write the pmp value to PxFBS.DEV field before issuing 200 * any command to PMP. 201 */ 202 static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc) 203 { 204 struct ata_port *ap = qc->ap; 205 struct ahci_host_priv *hpriv = ap->host->private_data; 206 struct xgene_ahci_context *ctx = hpriv->plat_data; 207 int rc = 0; 208 u32 port_fbs; 209 void *port_mmio = ahci_port_base(ap); 210 211 /* 212 * Write the pmp value to PxFBS.DEV 213 * for case of Port Mulitplier. 214 */ 215 if (ctx->class[ap->port_no] == ATA_DEV_PMP) { 216 port_fbs = readl(port_mmio + PORT_FBS); 217 port_fbs &= ~PORT_FBS_DEV_MASK; 218 port_fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET; 219 writel(port_fbs, port_mmio + PORT_FBS); 220 } 221 222 if (unlikely((ctx->last_cmd[ap->port_no] == ATA_CMD_ID_ATA) || 223 (ctx->last_cmd[ap->port_no] == ATA_CMD_PACKET) || 224 (ctx->last_cmd[ap->port_no] == ATA_CMD_SMART))) 225 xgene_ahci_restart_engine(ap); 226 227 rc = ahci_qc_issue(qc); 228 229 /* Save the last command issued */ 230 ctx->last_cmd[ap->port_no] = qc->tf.command; 231 232 return rc; 233 } 234 235 static bool xgene_ahci_is_memram_inited(struct xgene_ahci_context *ctx) 236 { 237 void __iomem *diagcsr = ctx->csr_diag; 238 239 return (readl(diagcsr + CFG_MEM_RAM_SHUTDOWN) == 0 && 240 readl(diagcsr + BLOCK_MEM_RDY) == 0xFFFFFFFF); 241 } 242 243 /** 244 * xgene_ahci_read_id - Read ID data from the specified device 245 * @dev: device 246 * @tf: proposed taskfile 247 * @id: data buffer 248 * 249 * This custom read ID function is required due to the fact that the HW 250 * does not support DEVSLP. 251 */ 252 static unsigned int xgene_ahci_read_id(struct ata_device *dev, 253 struct ata_taskfile *tf, u16 *id) 254 { 255 u32 err_mask; 256 257 err_mask = ata_do_dev_read_id(dev, tf, id); 258 if (err_mask) 259 return err_mask; 260 261 /* 262 * Mask reserved area. Word78 spec of Link Power Management 263 * bit15-8: reserved 264 * bit7: NCQ autosence 265 * bit6: Software settings preservation supported 266 * bit5: reserved 267 * bit4: In-order sata delivery supported 268 * bit3: DIPM requests supported 269 * bit2: DMA Setup FIS Auto-Activate optimization supported 270 * bit1: DMA Setup FIX non-Zero buffer offsets supported 271 * bit0: Reserved 272 * 273 * Clear reserved bit 8 (DEVSLP bit) as we don't support DEVSLP 274 */ 275 id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8)); 276 277 return 0; 278 } 279 280 static void xgene_ahci_set_phy_cfg(struct xgene_ahci_context *ctx, int channel) 281 { 282 void __iomem *mmio = ctx->hpriv->mmio; 283 u32 val; 284 285 dev_dbg(ctx->dev, "port configure mmio 0x%p channel %d\n", 286 mmio, channel); 287 val = readl(mmio + PORTCFG); 288 val = PORTADDR_SET(val, channel == 0 ? 2 : 3); 289 writel(val, mmio + PORTCFG); 290 readl(mmio + PORTCFG); /* Force a barrier */ 291 /* Disable fix rate */ 292 writel(0x0001fffe, mmio + PORTPHY1CFG); 293 readl(mmio + PORTPHY1CFG); /* Force a barrier */ 294 writel(0x28183219, mmio + PORTPHY2CFG); 295 readl(mmio + PORTPHY2CFG); /* Force a barrier */ 296 writel(0x13081008, mmio + PORTPHY3CFG); 297 readl(mmio + PORTPHY3CFG); /* Force a barrier */ 298 writel(0x00480815, mmio + PORTPHY4CFG); 299 readl(mmio + PORTPHY4CFG); /* Force a barrier */ 300 /* Set window negotiation */ 301 val = readl(mmio + PORTPHY5CFG); 302 val = PORTPHY5CFG_RTCHG_SET(val, 0x300); 303 writel(val, mmio + PORTPHY5CFG); 304 readl(mmio + PORTPHY5CFG); /* Force a barrier */ 305 val = readl(mmio + PORTAXICFG); 306 val = PORTAXICFG_EN_CONTEXT_SET(val, 0x1); /* Enable context mgmt */ 307 val = PORTAXICFG_OUTTRANS_SET(val, 0xe); /* Set outstanding */ 308 writel(val, mmio + PORTAXICFG); 309 readl(mmio + PORTAXICFG); /* Force a barrier */ 310 /* Set the watermark threshold of the receive FIFO */ 311 val = readl(mmio + PORTRANSCFG); 312 val = PORTRANSCFG_RXWM_SET(val, 0x30); 313 writel(val, mmio + PORTRANSCFG); 314 } 315 316 /** 317 * xgene_ahci_do_hardreset - Issue the actual COMRESET 318 * @link: link to reset 319 * @deadline: deadline jiffies for the operation 320 * @online: Return value to indicate if device online 321 * 322 * Due to the limitation of the hardware PHY, a difference set of setting is 323 * required for each supported disk speed - Gen3 (6.0Gbps), Gen2 (3.0Gbps), 324 * and Gen1 (1.5Gbps). Otherwise during long IO stress test, the PHY will 325 * report disparity error and etc. In addition, during COMRESET, there can 326 * be error reported in the register PORT_SCR_ERR. For SERR_DISPARITY and 327 * SERR_10B_8B_ERR, the PHY receiver line must be reseted. Also during long 328 * reboot cycle regression, sometimes the PHY reports link down even if the 329 * device is present because of speed negotiation failure. so need to retry 330 * the COMRESET to get the link up. The following algorithm is followed to 331 * proper configure the hardware PHY during COMRESET: 332 * 333 * Alg Part 1: 334 * 1. Start the PHY at Gen3 speed (default setting) 335 * 2. Issue the COMRESET 336 * 3. If no link, go to Alg Part 3 337 * 4. If link up, determine if the negotiated speed matches the PHY 338 * configured speed 339 * 5. If they matched, go to Alg Part 2 340 * 6. If they do not matched and first time, configure the PHY for the linked 341 * up disk speed and repeat step 2 342 * 7. Go to Alg Part 2 343 * 344 * Alg Part 2: 345 * 1. On link up, if there are any SERR_DISPARITY and SERR_10B_8B_ERR error 346 * reported in the register PORT_SCR_ERR, then reset the PHY receiver line 347 * 2. Go to Alg Part 4 348 * 349 * Alg Part 3: 350 * 1. Check the PORT_SCR_STAT to see whether device presence detected but PHY 351 * communication establishment failed and maximum link down attempts are 352 * less than Max attempts 3 then goto Alg Part 1. 353 * 2. Go to Alg Part 4. 354 * 355 * Alg Part 4: 356 * 1. Clear any pending from register PORT_SCR_ERR. 357 * 358 * NOTE: For the initial version, we will NOT support Gen1/Gen2. In addition 359 * and until the underlying PHY supports an method to reset the receiver 360 * line, on detection of SERR_DISPARITY or SERR_10B_8B_ERR errors, 361 * an warning message will be printed. 362 */ 363 static int xgene_ahci_do_hardreset(struct ata_link *link, 364 unsigned long deadline, bool *online) 365 { 366 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); 367 struct ata_port *ap = link->ap; 368 struct ahci_host_priv *hpriv = ap->host->private_data; 369 struct xgene_ahci_context *ctx = hpriv->plat_data; 370 struct ahci_port_priv *pp = ap->private_data; 371 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG; 372 void __iomem *port_mmio = ahci_port_base(ap); 373 struct ata_taskfile tf; 374 int link_down_retry = 0; 375 int rc; 376 u32 val, sstatus; 377 378 do { 379 /* clear D2H reception area to properly wait for D2H FIS */ 380 ata_tf_init(link->device, &tf); 381 tf.command = ATA_BUSY; 382 ata_tf_to_fis(&tf, 0, 0, d2h_fis); 383 rc = sata_link_hardreset(link, timing, deadline, online, 384 ahci_check_ready); 385 if (*online) { 386 val = readl(port_mmio + PORT_SCR_ERR); 387 if (val & (SERR_DISPARITY | SERR_10B_8B_ERR)) 388 dev_warn(ctx->dev, "link has error\n"); 389 break; 390 } 391 392 sata_scr_read(link, SCR_STATUS, &sstatus); 393 } while (link_down_retry++ < MAX_LINK_DOWN_RETRY && 394 (sstatus & 0xff) == 0x1); 395 396 /* clear all errors if any pending */ 397 val = readl(port_mmio + PORT_SCR_ERR); 398 writel(val, port_mmio + PORT_SCR_ERR); 399 400 return rc; 401 } 402 403 static int xgene_ahci_hardreset(struct ata_link *link, unsigned int *class, 404 unsigned long deadline) 405 { 406 struct ata_port *ap = link->ap; 407 struct ahci_host_priv *hpriv = ap->host->private_data; 408 void __iomem *port_mmio = ahci_port_base(ap); 409 bool online; 410 int rc; 411 u32 portcmd_saved; 412 u32 portclb_saved; 413 u32 portclbhi_saved; 414 u32 portrxfis_saved; 415 u32 portrxfishi_saved; 416 417 /* As hardreset resets these CSR, save it to restore later */ 418 portcmd_saved = readl(port_mmio + PORT_CMD); 419 portclb_saved = readl(port_mmio + PORT_LST_ADDR); 420 portclbhi_saved = readl(port_mmio + PORT_LST_ADDR_HI); 421 portrxfis_saved = readl(port_mmio + PORT_FIS_ADDR); 422 portrxfishi_saved = readl(port_mmio + PORT_FIS_ADDR_HI); 423 424 hpriv->stop_engine(ap); 425 426 rc = xgene_ahci_do_hardreset(link, deadline, &online); 427 428 /* As controller hardreset clears them, restore them */ 429 writel(portcmd_saved, port_mmio + PORT_CMD); 430 writel(portclb_saved, port_mmio + PORT_LST_ADDR); 431 writel(portclbhi_saved, port_mmio + PORT_LST_ADDR_HI); 432 writel(portrxfis_saved, port_mmio + PORT_FIS_ADDR); 433 writel(portrxfishi_saved, port_mmio + PORT_FIS_ADDR_HI); 434 435 hpriv->start_engine(ap); 436 437 if (online) 438 *class = ahci_dev_classify(ap); 439 440 return rc; 441 } 442 443 static void xgene_ahci_host_stop(struct ata_host *host) 444 { 445 struct ahci_host_priv *hpriv = host->private_data; 446 447 ahci_platform_disable_resources(hpriv); 448 } 449 450 /** 451 * xgene_ahci_pmp_softreset - Issue the softreset to the drives connected 452 * to Port Multiplier. 453 * @link: link to reset 454 * @class: Return value to indicate class of device 455 * @deadline: deadline jiffies for the operation 456 * 457 * Due to H/W errata, the controller is unable to save the PMP 458 * field fetched from command header before sending the H2D FIS. 459 * When the device returns the PMP port field in the D2H FIS, there is 460 * a mismatch and results in command completion failure. The workaround 461 * is to write the pmp value to PxFBS.DEV field before issuing any command 462 * to PMP. 463 */ 464 static int xgene_ahci_pmp_softreset(struct ata_link *link, unsigned int *class, 465 unsigned long deadline) 466 { 467 int pmp = sata_srst_pmp(link); 468 struct ata_port *ap = link->ap; 469 u32 rc; 470 void *port_mmio = ahci_port_base(ap); 471 u32 port_fbs; 472 473 /* 474 * Set PxFBS.DEV field with pmp 475 * value. 476 */ 477 port_fbs = readl(port_mmio + PORT_FBS); 478 port_fbs &= ~PORT_FBS_DEV_MASK; 479 port_fbs |= pmp << PORT_FBS_DEV_OFFSET; 480 writel(port_fbs, port_mmio + PORT_FBS); 481 482 rc = ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready); 483 484 return rc; 485 } 486 487 /** 488 * xgene_ahci_softreset - Issue the softreset to the drive. 489 * @link: link to reset 490 * @class: Return value to indicate class of device 491 * @deadline: deadline jiffies for the operation 492 * 493 * Due to H/W errata, the controller is unable to save the PMP 494 * field fetched from command header before sending the H2D FIS. 495 * When the device returns the PMP port field in the D2H FIS, there is 496 * a mismatch and results in command completion failure. The workaround 497 * is to write the pmp value to PxFBS.DEV field before issuing any command 498 * to PMP. Here is the algorithm to detect PMP : 499 * 500 * 1. Save the PxFBS value 501 * 2. Program PxFBS.DEV with pmp value send by framework. Framework sends 502 * 0xF for both PMP/NON-PMP initially 503 * 3. Issue softreset 504 * 4. If signature class is PMP goto 6 505 * 5. restore the original PxFBS and goto 3 506 * 6. return 507 */ 508 static int xgene_ahci_softreset(struct ata_link *link, unsigned int *class, 509 unsigned long deadline) 510 { 511 int pmp = sata_srst_pmp(link); 512 struct ata_port *ap = link->ap; 513 struct ahci_host_priv *hpriv = ap->host->private_data; 514 struct xgene_ahci_context *ctx = hpriv->plat_data; 515 void *port_mmio = ahci_port_base(ap); 516 u32 port_fbs; 517 u32 port_fbs_save; 518 u32 retry = 1; 519 u32 rc; 520 521 port_fbs_save = readl(port_mmio + PORT_FBS); 522 523 /* 524 * Set PxFBS.DEV field with pmp 525 * value. 526 */ 527 port_fbs = readl(port_mmio + PORT_FBS); 528 port_fbs &= ~PORT_FBS_DEV_MASK; 529 port_fbs |= pmp << PORT_FBS_DEV_OFFSET; 530 writel(port_fbs, port_mmio + PORT_FBS); 531 532 softreset_retry: 533 rc = ahci_do_softreset(link, class, pmp, 534 deadline, ahci_check_ready); 535 536 ctx->class[ap->port_no] = *class; 537 if (*class != ATA_DEV_PMP) { 538 /* 539 * Retry for normal drives without 540 * setting PxFBS.DEV field with pmp value. 541 */ 542 if (retry--) { 543 writel(port_fbs_save, port_mmio + PORT_FBS); 544 goto softreset_retry; 545 } 546 } 547 548 return rc; 549 } 550 551 /** 552 * xgene_ahci_handle_broken_edge_irq - Handle the broken irq. 553 * @ata_host: Host that recieved the irq 554 * @irq_masked: HOST_IRQ_STAT value 555 * 556 * For hardware with broken edge trigger latch 557 * the HOST_IRQ_STAT register misses the edge interrupt 558 * when clearing of HOST_IRQ_STAT register and hardware 559 * reporting the PORT_IRQ_STAT register at the 560 * same clock cycle. 561 * As such, the algorithm below outlines the workaround. 562 * 563 * 1. Read HOST_IRQ_STAT register and save the state. 564 * 2. Clear the HOST_IRQ_STAT register. 565 * 3. Read back the HOST_IRQ_STAT register. 566 * 4. If HOST_IRQ_STAT register equals to zero, then 567 * traverse the rest of port's PORT_IRQ_STAT register 568 * to check if an interrupt is triggered at that point else 569 * go to step 6. 570 * 5. If PORT_IRQ_STAT register of rest ports is not equal to zero 571 * then update the state of HOST_IRQ_STAT saved in step 1. 572 * 6. Handle port interrupts. 573 * 7. Exit 574 */ 575 static int xgene_ahci_handle_broken_edge_irq(struct ata_host *host, 576 u32 irq_masked) 577 { 578 struct ahci_host_priv *hpriv = host->private_data; 579 void __iomem *port_mmio; 580 int i; 581 582 if (!readl(hpriv->mmio + HOST_IRQ_STAT)) { 583 for (i = 0; i < host->n_ports; i++) { 584 if (irq_masked & (1 << i)) 585 continue; 586 587 port_mmio = ahci_port_base(host->ports[i]); 588 if (readl(port_mmio + PORT_IRQ_STAT)) 589 irq_masked |= (1 << i); 590 } 591 } 592 593 return ahci_handle_port_intr(host, irq_masked); 594 } 595 596 static irqreturn_t xgene_ahci_irq_intr(int irq, void *dev_instance) 597 { 598 struct ata_host *host = dev_instance; 599 struct ahci_host_priv *hpriv; 600 unsigned int rc = 0; 601 void __iomem *mmio; 602 u32 irq_stat, irq_masked; 603 604 VPRINTK("ENTER\n"); 605 606 hpriv = host->private_data; 607 mmio = hpriv->mmio; 608 609 /* sigh. 0xffffffff is a valid return from h/w */ 610 irq_stat = readl(mmio + HOST_IRQ_STAT); 611 if (!irq_stat) 612 return IRQ_NONE; 613 614 irq_masked = irq_stat & hpriv->port_map; 615 616 spin_lock(&host->lock); 617 618 /* 619 * HOST_IRQ_STAT behaves as edge triggered latch meaning that 620 * it should be cleared before all the port events are cleared. 621 */ 622 writel(irq_stat, mmio + HOST_IRQ_STAT); 623 624 rc = xgene_ahci_handle_broken_edge_irq(host, irq_masked); 625 626 spin_unlock(&host->lock); 627 628 VPRINTK("EXIT\n"); 629 630 return IRQ_RETVAL(rc); 631 } 632 633 static struct ata_port_operations xgene_ahci_v1_ops = { 634 .inherits = &ahci_ops, 635 .host_stop = xgene_ahci_host_stop, 636 .hardreset = xgene_ahci_hardreset, 637 .read_id = xgene_ahci_read_id, 638 .qc_issue = xgene_ahci_qc_issue, 639 .softreset = xgene_ahci_softreset, 640 .pmp_softreset = xgene_ahci_pmp_softreset 641 }; 642 643 static const struct ata_port_info xgene_ahci_v1_port_info = { 644 .flags = AHCI_FLAG_COMMON | ATA_FLAG_PMP, 645 .pio_mask = ATA_PIO4, 646 .udma_mask = ATA_UDMA6, 647 .port_ops = &xgene_ahci_v1_ops, 648 }; 649 650 static struct ata_port_operations xgene_ahci_v2_ops = { 651 .inherits = &ahci_ops, 652 .host_stop = xgene_ahci_host_stop, 653 .hardreset = xgene_ahci_hardreset, 654 .read_id = xgene_ahci_read_id, 655 }; 656 657 static const struct ata_port_info xgene_ahci_v2_port_info = { 658 .flags = AHCI_FLAG_COMMON | ATA_FLAG_PMP, 659 .pio_mask = ATA_PIO4, 660 .udma_mask = ATA_UDMA6, 661 .port_ops = &xgene_ahci_v2_ops, 662 }; 663 664 static int xgene_ahci_hw_init(struct ahci_host_priv *hpriv) 665 { 666 struct xgene_ahci_context *ctx = hpriv->plat_data; 667 int i; 668 int rc; 669 u32 val; 670 671 /* Remove IP RAM out of shutdown */ 672 rc = xgene_ahci_init_memram(ctx); 673 if (rc) 674 return rc; 675 676 for (i = 0; i < MAX_AHCI_CHN_PERCTR; i++) 677 xgene_ahci_set_phy_cfg(ctx, i); 678 679 /* AXI disable Mask */ 680 writel(0xffffffff, hpriv->mmio + HOST_IRQ_STAT); 681 readl(hpriv->mmio + HOST_IRQ_STAT); /* Force a barrier */ 682 writel(0, ctx->csr_core + INTSTATUSMASK); 683 val = readl(ctx->csr_core + INTSTATUSMASK); /* Force a barrier */ 684 dev_dbg(ctx->dev, "top level interrupt mask 0x%X value 0x%08X\n", 685 INTSTATUSMASK, val); 686 687 writel(0x0, ctx->csr_core + ERRINTSTATUSMASK); 688 readl(ctx->csr_core + ERRINTSTATUSMASK); /* Force a barrier */ 689 writel(0x0, ctx->csr_axi + INT_SLV_TMOMASK); 690 readl(ctx->csr_axi + INT_SLV_TMOMASK); 691 692 /* Enable AXI Interrupt */ 693 writel(0xffffffff, ctx->csr_core + SLVRDERRATTRIBUTES); 694 writel(0xffffffff, ctx->csr_core + SLVWRERRATTRIBUTES); 695 writel(0xffffffff, ctx->csr_core + MSTRDERRATTRIBUTES); 696 writel(0xffffffff, ctx->csr_core + MSTWRERRATTRIBUTES); 697 698 /* Enable coherency */ 699 val = readl(ctx->csr_core + BUSCTLREG); 700 val &= ~0x00000002; /* Enable write coherency */ 701 val &= ~0x00000001; /* Enable read coherency */ 702 writel(val, ctx->csr_core + BUSCTLREG); 703 704 val = readl(ctx->csr_core + IOFMSTRWAUX); 705 val |= (1 << 3); /* Enable read coherency */ 706 val |= (1 << 9); /* Enable write coherency */ 707 writel(val, ctx->csr_core + IOFMSTRWAUX); 708 val = readl(ctx->csr_core + IOFMSTRWAUX); 709 dev_dbg(ctx->dev, "coherency 0x%X value 0x%08X\n", 710 IOFMSTRWAUX, val); 711 712 return rc; 713 } 714 715 static int xgene_ahci_mux_select(struct xgene_ahci_context *ctx) 716 { 717 u32 val; 718 719 /* Check for optional MUX resource */ 720 if (!ctx->csr_mux) 721 return 0; 722 723 val = readl(ctx->csr_mux + SATA_ENET_CONFIG_REG); 724 val &= ~CFG_SATA_ENET_SELECT_MASK; 725 writel(val, ctx->csr_mux + SATA_ENET_CONFIG_REG); 726 val = readl(ctx->csr_mux + SATA_ENET_CONFIG_REG); 727 return val & CFG_SATA_ENET_SELECT_MASK ? -1 : 0; 728 } 729 730 static struct scsi_host_template ahci_platform_sht = { 731 AHCI_SHT(DRV_NAME), 732 }; 733 734 #ifdef CONFIG_ACPI 735 static const struct acpi_device_id xgene_ahci_acpi_match[] = { 736 { "APMC0D0D", XGENE_AHCI_V1}, 737 { "APMC0D32", XGENE_AHCI_V2}, 738 {}, 739 }; 740 MODULE_DEVICE_TABLE(acpi, xgene_ahci_acpi_match); 741 #endif 742 743 static const struct of_device_id xgene_ahci_of_match[] = { 744 {.compatible = "apm,xgene-ahci", .data = (void *) XGENE_AHCI_V1}, 745 {.compatible = "apm,xgene-ahci-v2", .data = (void *) XGENE_AHCI_V2}, 746 {}, 747 }; 748 MODULE_DEVICE_TABLE(of, xgene_ahci_of_match); 749 750 static int xgene_ahci_probe(struct platform_device *pdev) 751 { 752 struct device *dev = &pdev->dev; 753 struct ahci_host_priv *hpriv; 754 struct xgene_ahci_context *ctx; 755 struct resource *res; 756 const struct of_device_id *of_devid; 757 enum xgene_ahci_version version = XGENE_AHCI_V1; 758 const struct ata_port_info *ppi[] = { &xgene_ahci_v1_port_info, 759 &xgene_ahci_v2_port_info }; 760 int rc; 761 762 hpriv = ahci_platform_get_resources(pdev, 0); 763 if (IS_ERR(hpriv)) 764 return PTR_ERR(hpriv); 765 766 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 767 if (!ctx) 768 return -ENOMEM; 769 770 hpriv->plat_data = ctx; 771 ctx->hpriv = hpriv; 772 ctx->dev = dev; 773 774 /* Retrieve the IP core resource */ 775 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 776 ctx->csr_core = devm_ioremap_resource(dev, res); 777 if (IS_ERR(ctx->csr_core)) 778 return PTR_ERR(ctx->csr_core); 779 780 /* Retrieve the IP diagnostic resource */ 781 res = platform_get_resource(pdev, IORESOURCE_MEM, 2); 782 ctx->csr_diag = devm_ioremap_resource(dev, res); 783 if (IS_ERR(ctx->csr_diag)) 784 return PTR_ERR(ctx->csr_diag); 785 786 /* Retrieve the IP AXI resource */ 787 res = platform_get_resource(pdev, IORESOURCE_MEM, 3); 788 ctx->csr_axi = devm_ioremap_resource(dev, res); 789 if (IS_ERR(ctx->csr_axi)) 790 return PTR_ERR(ctx->csr_axi); 791 792 /* Retrieve the optional IP mux resource */ 793 res = platform_get_resource(pdev, IORESOURCE_MEM, 4); 794 if (res) { 795 void __iomem *csr = devm_ioremap_resource(dev, res); 796 if (IS_ERR(csr)) 797 return PTR_ERR(csr); 798 799 ctx->csr_mux = csr; 800 } 801 802 of_devid = of_match_device(xgene_ahci_of_match, dev); 803 if (of_devid) { 804 if (of_devid->data) 805 version = (enum xgene_ahci_version) of_devid->data; 806 } 807 #ifdef CONFIG_ACPI 808 else { 809 const struct acpi_device_id *acpi_id; 810 struct acpi_device_info *info; 811 acpi_status status; 812 813 acpi_id = acpi_match_device(xgene_ahci_acpi_match, &pdev->dev); 814 if (!acpi_id) { 815 dev_warn(&pdev->dev, "No node entry in ACPI table. Assume version1\n"); 816 version = XGENE_AHCI_V1; 817 } else if (acpi_id->driver_data) { 818 version = (enum xgene_ahci_version) acpi_id->driver_data; 819 status = acpi_get_object_info(ACPI_HANDLE(&pdev->dev), &info); 820 if (ACPI_FAILURE(status)) { 821 dev_warn(&pdev->dev, "%s: Error reading device info. Assume version1\n", 822 __func__); 823 version = XGENE_AHCI_V1; 824 } else { 825 if (info->valid & ACPI_VALID_CID) 826 version = XGENE_AHCI_V2; 827 kfree(info); 828 } 829 } 830 } 831 #endif 832 833 dev_dbg(dev, "VAddr 0x%p Mmio VAddr 0x%p\n", ctx->csr_core, 834 hpriv->mmio); 835 836 /* Select ATA */ 837 if ((rc = xgene_ahci_mux_select(ctx))) { 838 dev_err(dev, "SATA mux selection failed error %d\n", rc); 839 return -ENODEV; 840 } 841 842 if (xgene_ahci_is_memram_inited(ctx)) { 843 dev_info(dev, "skip clock and PHY initialization\n"); 844 goto skip_clk_phy; 845 } 846 847 /* Due to errata, HW requires full toggle transition */ 848 rc = ahci_platform_enable_clks(hpriv); 849 if (rc) 850 goto disable_resources; 851 ahci_platform_disable_clks(hpriv); 852 853 rc = ahci_platform_enable_resources(hpriv); 854 if (rc) 855 goto disable_resources; 856 857 /* Configure the host controller */ 858 xgene_ahci_hw_init(hpriv); 859 skip_clk_phy: 860 861 switch (version) { 862 case XGENE_AHCI_V1: 863 hpriv->flags = AHCI_HFLAG_NO_NCQ; 864 break; 865 case XGENE_AHCI_V2: 866 hpriv->flags |= AHCI_HFLAG_YES_FBS; 867 hpriv->irq_handler = xgene_ahci_irq_intr; 868 break; 869 default: 870 break; 871 } 872 873 rc = ahci_platform_init_host(pdev, hpriv, ppi[version - 1], 874 &ahci_platform_sht); 875 if (rc) 876 goto disable_resources; 877 878 dev_dbg(dev, "X-Gene SATA host controller initialized\n"); 879 return 0; 880 881 disable_resources: 882 ahci_platform_disable_resources(hpriv); 883 return rc; 884 } 885 886 static struct platform_driver xgene_ahci_driver = { 887 .probe = xgene_ahci_probe, 888 .remove = ata_platform_remove_one, 889 .driver = { 890 .name = DRV_NAME, 891 .of_match_table = xgene_ahci_of_match, 892 .acpi_match_table = ACPI_PTR(xgene_ahci_acpi_match), 893 }, 894 }; 895 896 module_platform_driver(xgene_ahci_driver); 897 898 MODULE_DESCRIPTION("APM X-Gene AHCI SATA driver"); 899 MODULE_AUTHOR("Loc Ho <lho@apm.com>"); 900 MODULE_LICENSE("GPL"); 901 MODULE_VERSION("0.4"); 902