2 * Copyright(c) 2015 - 2017 Intel Corporation.
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
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48 #include <linux/pci.h>
50 #include <linux/delay.h>
51 #include <linux/vmalloc.h>
52 #include <linux/aer.h>
53 #include <linux/module.h>
56 #include "chip_registers.h"
60 * This file contains PCIe utility routines.
64 * Code to adjust PCIe capabilities.
66 static void tune_pcie_caps(struct hfi1_devdata *);
69 * Do all the common PCIe setup and initialization.
70 * devdata is not yet allocated, and is not allocated until after this
71 * routine returns success. Therefore dd_dev_err() can't be used for error
74 int hfi1_pcie_init(struct pci_dev *pdev, const struct pci_device_id *ent)
78 ret = pci_enable_device(pdev);
81 * This can happen (in theory) iff:
82 * We did a chip reset, and then failed to reprogram the
83 * BAR, or the chip reset due to an internal error. We then
84 * unloaded the driver and reloaded it.
86 * Both reset cases set the BAR back to initial state. For
87 * the latter case, the AER sticky error bit at offset 0x718
88 * should be set, but the Linux kernel doesn't yet know
89 * about that, it appears. If the original BAR was retained
90 * in the kernel data structures, this may be OK.
92 hfi1_early_err(&pdev->dev, "pci enable failed: error %d\n",
97 ret = pci_request_regions(pdev, DRIVER_NAME);
99 hfi1_early_err(&pdev->dev,
100 "pci_request_regions fails: err %d\n", -ret);
104 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
107 * If the 64 bit setup fails, try 32 bit. Some systems
108 * do not setup 64 bit maps on systems with 2GB or less
111 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
113 hfi1_early_err(&pdev->dev,
114 "Unable to set DMA mask: %d\n", ret);
117 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
119 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
122 hfi1_early_err(&pdev->dev,
123 "Unable to set DMA consistent mask: %d\n", ret);
127 pci_set_master(pdev);
128 (void)pci_enable_pcie_error_reporting(pdev);
132 hfi1_pcie_cleanup(pdev);
138 * Clean what was done in hfi1_pcie_init()
140 void hfi1_pcie_cleanup(struct pci_dev *pdev)
142 pci_disable_device(pdev);
144 * Release regions should be called after the disable. OK to
145 * call if request regions has not been called or failed.
147 pci_release_regions(pdev);
151 * Do remaining PCIe setup, once dd is allocated, and save away
152 * fields required to re-initialize after a chip reset, or for
153 * various other purposes
155 int hfi1_pcie_ddinit(struct hfi1_devdata *dd, struct pci_dev *pdev)
158 resource_size_t addr;
161 addr = pci_resource_start(pdev, 0);
162 len = pci_resource_len(pdev, 0);
165 * The TXE PIO buffers are at the tail end of the chip space.
166 * Cut them off and map them separately.
169 /* sanity check vs expectations */
170 if (len != TXE_PIO_SEND + TXE_PIO_SIZE) {
171 dd_dev_err(dd, "chip PIO range does not match\n");
175 dd->kregbase1 = ioremap_nocache(addr, RCV_ARRAY);
176 if (!dd->kregbase1) {
177 dd_dev_err(dd, "UC mapping of kregbase1 failed\n");
180 dd_dev_info(dd, "UC base1: %p for %x\n", dd->kregbase1, RCV_ARRAY);
181 dd->chip_rcv_array_count = readq(dd->kregbase1 + RCV_ARRAY_CNT);
182 dd_dev_info(dd, "RcvArray count: %u\n", dd->chip_rcv_array_count);
183 dd->base2_start = RCV_ARRAY + dd->chip_rcv_array_count * 8;
185 dd->kregbase2 = ioremap_nocache(
186 addr + dd->base2_start,
187 TXE_PIO_SEND - dd->base2_start);
188 if (!dd->kregbase2) {
189 dd_dev_err(dd, "UC mapping of kregbase2 failed\n");
192 dd_dev_info(dd, "UC base2: %p for %x\n", dd->kregbase2,
193 TXE_PIO_SEND - dd->base2_start);
195 dd->piobase = ioremap_wc(addr + TXE_PIO_SEND, TXE_PIO_SIZE);
197 dd_dev_err(dd, "WC mapping of send buffers failed\n");
200 dd_dev_info(dd, "WC piobase: %p\n for %x", dd->piobase, TXE_PIO_SIZE);
202 dd->physaddr = addr; /* used for io_remap, etc. */
205 * Map the chip's RcvArray as write-combining to allow us
206 * to write an entire cacheline worth of entries in one shot.
208 dd->rcvarray_wc = ioremap_wc(addr + RCV_ARRAY,
209 dd->chip_rcv_array_count * 8);
210 if (!dd->rcvarray_wc) {
211 dd_dev_err(dd, "WC mapping of receive array failed\n");
214 dd_dev_info(dd, "WC RcvArray: %p for %x\n",
215 dd->rcvarray_wc, dd->chip_rcv_array_count * 8);
217 dd->flags |= HFI1_PRESENT; /* chip.c CSR routines now work */
221 hfi1_pcie_ddcleanup(dd);
226 * Do PCIe cleanup related to dd, after chip-specific cleanup, etc. Just prior
227 * to releasing the dd memory.
228 * Void because all of the core pcie cleanup functions are void.
230 void hfi1_pcie_ddcleanup(struct hfi1_devdata *dd)
232 dd->flags &= ~HFI1_PRESENT;
234 iounmap(dd->kregbase1);
235 dd->kregbase1 = NULL;
237 iounmap(dd->kregbase2);
238 dd->kregbase2 = NULL;
240 iounmap(dd->rcvarray_wc);
241 dd->rcvarray_wc = NULL;
243 iounmap(dd->piobase);
247 /* return the PCIe link speed from the given link status */
248 static u32 extract_speed(u16 linkstat)
252 switch (linkstat & PCI_EXP_LNKSTA_CLS) {
253 default: /* not defined, assume Gen1 */
254 case PCI_EXP_LNKSTA_CLS_2_5GB:
255 speed = 2500; /* Gen 1, 2.5GHz */
257 case PCI_EXP_LNKSTA_CLS_5_0GB:
258 speed = 5000; /* Gen 2, 5GHz */
260 case PCI_EXP_LNKSTA_CLS_8_0GB:
261 speed = 8000; /* Gen 3, 8GHz */
267 /* return the PCIe link speed from the given link status */
268 static u32 extract_width(u16 linkstat)
270 return (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
273 /* read the link status and set dd->{lbus_width,lbus_speed,lbus_info} */
274 static void update_lbus_info(struct hfi1_devdata *dd)
279 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKSTA, &linkstat);
281 dd_dev_err(dd, "Unable to read from PCI config\n");
285 dd->lbus_width = extract_width(linkstat);
286 dd->lbus_speed = extract_speed(linkstat);
287 snprintf(dd->lbus_info, sizeof(dd->lbus_info),
288 "PCIe,%uMHz,x%u", dd->lbus_speed, dd->lbus_width);
292 * Read in the current PCIe link width and speed. Find if the link is
295 int pcie_speeds(struct hfi1_devdata *dd)
298 struct pci_dev *parent = dd->pcidev->bus->self;
301 if (!pci_is_pcie(dd->pcidev)) {
302 dd_dev_err(dd, "Can't find PCI Express capability!\n");
306 /* find if our max speed is Gen3 and parent supports Gen3 speeds */
307 dd->link_gen3_capable = 1;
309 ret = pcie_capability_read_dword(dd->pcidev, PCI_EXP_LNKCAP, &linkcap);
311 dd_dev_err(dd, "Unable to read from PCI config\n");
315 if ((linkcap & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_8_0GB) {
317 "This HFI is not Gen3 capable, max speed 0x%x, need 0x3\n",
318 linkcap & PCI_EXP_LNKCAP_SLS);
319 dd->link_gen3_capable = 0;
323 * bus->max_bus_speed is set from the bridge's linkcap Max Link Speed
325 if (parent && dd->pcidev->bus->max_bus_speed != PCIE_SPEED_8_0GT) {
326 dd_dev_info(dd, "Parent PCIe bridge does not support Gen3\n");
327 dd->link_gen3_capable = 0;
330 /* obtain the link width and current speed */
331 update_lbus_info(dd);
333 dd_dev_info(dd, "%s\n", dd->lbus_info);
340 * - actual number of interrupts allocated or
341 * - 0 if fell back to INTx.
344 int request_msix(struct hfi1_devdata *dd, u32 msireq)
348 nvec = pci_alloc_irq_vectors(dd->pcidev, 1, msireq,
349 PCI_IRQ_MSIX | PCI_IRQ_LEGACY);
351 dd_dev_err(dd, "pci_alloc_irq_vectors() failed: %d\n", nvec);
357 /* check for legacy IRQ */
358 if (nvec == 1 && !dd->pcidev->msix_enabled)
364 /* restore command and BARs after a reset has wiped them out */
365 int restore_pci_variables(struct hfi1_devdata *dd)
369 ret = pci_write_config_word(dd->pcidev, PCI_COMMAND, dd->pci_command);
373 ret = pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0,
378 ret = pci_write_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1,
383 ret = pci_write_config_dword(dd->pcidev, PCI_ROM_ADDRESS, dd->pci_rom);
387 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL,
392 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_LNKCTL,
397 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL2,
402 ret = pci_write_config_dword(dd->pcidev, PCI_CFG_MSIX0, dd->pci_msix0);
406 if (pci_find_ext_capability(dd->pcidev, PCI_EXT_CAP_ID_TPH)) {
407 ret = pci_write_config_dword(dd->pcidev, PCIE_CFG_TPH2,
415 dd_dev_err(dd, "Unable to write to PCI config\n");
419 /* Save BARs and command to rewrite after device reset */
420 int save_pci_variables(struct hfi1_devdata *dd)
424 ret = pci_read_config_dword(dd->pcidev, PCI_BASE_ADDRESS_0,
429 ret = pci_read_config_dword(dd->pcidev, PCI_BASE_ADDRESS_1,
434 ret = pci_read_config_dword(dd->pcidev, PCI_ROM_ADDRESS, &dd->pci_rom);
438 ret = pci_read_config_word(dd->pcidev, PCI_COMMAND, &dd->pci_command);
442 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL,
447 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKCTL,
452 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL2,
457 ret = pci_read_config_dword(dd->pcidev, PCI_CFG_MSIX0, &dd->pci_msix0);
461 if (pci_find_ext_capability(dd->pcidev, PCI_EXT_CAP_ID_TPH)) {
462 ret = pci_read_config_dword(dd->pcidev, PCIE_CFG_TPH2,
470 dd_dev_err(dd, "Unable to read from PCI config\n");
475 * BIOS may not set PCIe bus-utilization parameters for best performance.
476 * Check and optionally adjust them to maximize our throughput.
478 static int hfi1_pcie_caps;
479 module_param_named(pcie_caps, hfi1_pcie_caps, int, S_IRUGO);
480 MODULE_PARM_DESC(pcie_caps, "Max PCIe tuning: Payload (0..3), ReadReq (4..7)");
482 uint aspm_mode = ASPM_MODE_DISABLED;
483 module_param_named(aspm, aspm_mode, uint, S_IRUGO);
484 MODULE_PARM_DESC(aspm, "PCIe ASPM: 0: disable, 1: enable, 2: dynamic");
486 static void tune_pcie_caps(struct hfi1_devdata *dd)
488 struct pci_dev *parent;
489 u16 rc_mpss, rc_mps, ep_mpss, ep_mps;
490 u16 rc_mrrs, ep_mrrs, max_mrrs, ectl;
494 * Turn on extended tags in DevCtl in case the BIOS has turned it off
495 * to improve WFR SDMA bandwidth
497 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL, &ectl);
498 if ((!ret) && !(ectl & PCI_EXP_DEVCTL_EXT_TAG)) {
499 dd_dev_info(dd, "Enabling PCIe extended tags\n");
500 ectl |= PCI_EXP_DEVCTL_EXT_TAG;
501 ret = pcie_capability_write_word(dd->pcidev,
502 PCI_EXP_DEVCTL, ectl);
504 dd_dev_info(dd, "Unable to write to PCI config\n");
506 /* Find out supported and configured values for parent (root) */
507 parent = dd->pcidev->bus->self;
509 * The driver cannot perform the tuning if it does not have
510 * access to the upstream component.
513 dd_dev_info(dd, "Parent not found\n");
516 if (!pci_is_root_bus(parent->bus)) {
517 dd_dev_info(dd, "Parent not root\n");
520 if (!pci_is_pcie(parent)) {
521 dd_dev_info(dd, "Parent is not PCI Express capable\n");
524 if (!pci_is_pcie(dd->pcidev)) {
525 dd_dev_info(dd, "PCI device is not PCI Express capable\n");
528 rc_mpss = parent->pcie_mpss;
529 rc_mps = ffs(pcie_get_mps(parent)) - 8;
530 /* Find out supported and configured values for endpoint (us) */
531 ep_mpss = dd->pcidev->pcie_mpss;
532 ep_mps = ffs(pcie_get_mps(dd->pcidev)) - 8;
534 /* Find max payload supported by root, endpoint */
535 if (rc_mpss > ep_mpss)
538 /* If Supported greater than limit in module param, limit it */
539 if (rc_mpss > (hfi1_pcie_caps & 7))
540 rc_mpss = hfi1_pcie_caps & 7;
541 /* If less than (allowed, supported), bump root payload */
542 if (rc_mpss > rc_mps) {
544 pcie_set_mps(parent, 128 << rc_mps);
546 /* If less than (allowed, supported), bump endpoint payload */
547 if (rc_mpss > ep_mps) {
549 pcie_set_mps(dd->pcidev, 128 << ep_mps);
553 * Now the Read Request size.
554 * No field for max supported, but PCIe spec limits it to 4096,
555 * which is code '5' (log2(4096) - 7)
558 if (max_mrrs > ((hfi1_pcie_caps >> 4) & 7))
559 max_mrrs = (hfi1_pcie_caps >> 4) & 7;
561 max_mrrs = 128 << max_mrrs;
562 rc_mrrs = pcie_get_readrq(parent);
563 ep_mrrs = pcie_get_readrq(dd->pcidev);
565 if (max_mrrs > rc_mrrs) {
567 pcie_set_readrq(parent, rc_mrrs);
569 if (max_mrrs > ep_mrrs) {
571 pcie_set_readrq(dd->pcidev, ep_mrrs);
575 /* End of PCIe capability tuning */
578 * From here through hfi1_pci_err_handler definition is invoked via
579 * PCI error infrastructure, registered via pci
581 static pci_ers_result_t
582 pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
584 struct hfi1_devdata *dd = pci_get_drvdata(pdev);
585 pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED;
588 case pci_channel_io_normal:
589 dd_dev_info(dd, "State Normal, ignoring\n");
592 case pci_channel_io_frozen:
593 dd_dev_info(dd, "State Frozen, requesting reset\n");
594 pci_disable_device(pdev);
595 ret = PCI_ERS_RESULT_NEED_RESET;
598 case pci_channel_io_perm_failure:
600 dd_dev_info(dd, "State Permanent Failure, disabling\n");
601 /* no more register accesses! */
602 dd->flags &= ~HFI1_PRESENT;
603 hfi1_disable_after_error(dd);
605 /* else early, or other problem */
606 ret = PCI_ERS_RESULT_DISCONNECT;
609 default: /* shouldn't happen */
610 dd_dev_info(dd, "HFI1 PCI errors detected (state %d)\n",
617 static pci_ers_result_t
618 pci_mmio_enabled(struct pci_dev *pdev)
621 struct hfi1_devdata *dd = pci_get_drvdata(pdev);
622 pci_ers_result_t ret = PCI_ERS_RESULT_RECOVERED;
624 if (dd && dd->pport) {
625 words = read_port_cntr(dd->pport, C_RX_WORDS, CNTR_INVALID_VL);
627 ret = PCI_ERS_RESULT_NEED_RESET;
629 "HFI1 mmio_enabled function called, read wordscntr %llx, returning %d\n",
635 static pci_ers_result_t
636 pci_slot_reset(struct pci_dev *pdev)
638 struct hfi1_devdata *dd = pci_get_drvdata(pdev);
640 dd_dev_info(dd, "HFI1 slot_reset function called, ignored\n");
641 return PCI_ERS_RESULT_CAN_RECOVER;
645 pci_resume(struct pci_dev *pdev)
647 struct hfi1_devdata *dd = pci_get_drvdata(pdev);
649 dd_dev_info(dd, "HFI1 resume function called\n");
650 pci_cleanup_aer_uncorrect_error_status(pdev);
652 * Running jobs will fail, since it's asynchronous
653 * unlike sysfs-requested reset. Better than
656 hfi1_init(dd, 1); /* same as re-init after reset */
659 const struct pci_error_handlers hfi1_pci_err_handler = {
660 .error_detected = pci_error_detected,
661 .mmio_enabled = pci_mmio_enabled,
662 .slot_reset = pci_slot_reset,
663 .resume = pci_resume,
666 /*============================================================================*/
667 /* PCIe Gen3 support */
670 * This code is separated out because it is expected to be removed in the
671 * final shipping product. If not, then it will be revisited and items
672 * will be moved to more standard locations.
675 /* ASIC_PCI_SD_HOST_STATUS.FW_DNLD_STS field values */
676 #define DL_STATUS_HFI0 0x1 /* hfi0 firmware download complete */
677 #define DL_STATUS_HFI1 0x2 /* hfi1 firmware download complete */
678 #define DL_STATUS_BOTH 0x3 /* hfi0 and hfi1 firmware download complete */
680 /* ASIC_PCI_SD_HOST_STATUS.FW_DNLD_ERR field values */
681 #define DL_ERR_NONE 0x0 /* no error */
682 #define DL_ERR_SWAP_PARITY 0x1 /* parity error in SerDes interrupt */
683 /* or response data */
684 #define DL_ERR_DISABLED 0x2 /* hfi disabled */
685 #define DL_ERR_SECURITY 0x3 /* security check failed */
686 #define DL_ERR_SBUS 0x4 /* SBus status error */
687 #define DL_ERR_XFR_PARITY 0x5 /* parity error during ROM transfer*/
689 /* gasket block secondary bus reset delay */
690 #define SBR_DELAY_US 200000 /* 200ms */
692 static uint pcie_target = 3;
693 module_param(pcie_target, uint, S_IRUGO);
694 MODULE_PARM_DESC(pcie_target, "PCIe target speed (0 skip, 1-3 Gen1-3)");
696 static uint pcie_force;
697 module_param(pcie_force, uint, S_IRUGO);
698 MODULE_PARM_DESC(pcie_force, "Force driver to do a PCIe firmware download even if already at target speed");
700 static uint pcie_retry = 5;
701 module_param(pcie_retry, uint, S_IRUGO);
702 MODULE_PARM_DESC(pcie_retry, "Driver will try this many times to reach requested speed");
704 #define UNSET_PSET 255
705 #define DEFAULT_DISCRETE_PSET 2 /* discrete HFI */
706 #define DEFAULT_MCP_PSET 6 /* MCP HFI */
707 static uint pcie_pset = UNSET_PSET;
708 module_param(pcie_pset, uint, S_IRUGO);
709 MODULE_PARM_DESC(pcie_pset, "PCIe Eq Pset value to use, range is 0-10");
711 static uint pcie_ctle = 3; /* discrete on, integrated on */
712 module_param(pcie_ctle, uint, S_IRUGO);
713 MODULE_PARM_DESC(pcie_ctle, "PCIe static CTLE mode, bit 0 - discrete on/off, bit 1 - integrated on/off");
715 /* equalization columns */
720 /* discrete silicon preliminary equalization values */
721 static const u8 discrete_preliminary_eq[11][3] = {
723 { 0x00, 0x00, 0x12 }, /* p0 */
724 { 0x00, 0x00, 0x0c }, /* p1 */
725 { 0x00, 0x00, 0x0f }, /* p2 */
726 { 0x00, 0x00, 0x09 }, /* p3 */
727 { 0x00, 0x00, 0x00 }, /* p4 */
728 { 0x06, 0x00, 0x00 }, /* p5 */
729 { 0x09, 0x00, 0x00 }, /* p6 */
730 { 0x06, 0x00, 0x0f }, /* p7 */
731 { 0x09, 0x00, 0x09 }, /* p8 */
732 { 0x0c, 0x00, 0x00 }, /* p9 */
733 { 0x00, 0x00, 0x18 }, /* p10 */
736 /* integrated silicon preliminary equalization values */
737 static const u8 integrated_preliminary_eq[11][3] = {
739 { 0x00, 0x1e, 0x07 }, /* p0 */
740 { 0x00, 0x1e, 0x05 }, /* p1 */
741 { 0x00, 0x1e, 0x06 }, /* p2 */
742 { 0x00, 0x1e, 0x04 }, /* p3 */
743 { 0x00, 0x1e, 0x00 }, /* p4 */
744 { 0x03, 0x1e, 0x00 }, /* p5 */
745 { 0x04, 0x1e, 0x00 }, /* p6 */
746 { 0x03, 0x1e, 0x06 }, /* p7 */
747 { 0x03, 0x1e, 0x04 }, /* p8 */
748 { 0x05, 0x1e, 0x00 }, /* p9 */
749 { 0x00, 0x1e, 0x0a }, /* p10 */
752 static const u8 discrete_ctle_tunings[11][4] = {
754 { 0x48, 0x0b, 0x04, 0x04 }, /* p0 */
755 { 0x60, 0x05, 0x0f, 0x0a }, /* p1 */
756 { 0x50, 0x09, 0x06, 0x06 }, /* p2 */
757 { 0x68, 0x05, 0x0f, 0x0a }, /* p3 */
758 { 0x80, 0x05, 0x0f, 0x0a }, /* p4 */
759 { 0x70, 0x05, 0x0f, 0x0a }, /* p5 */
760 { 0x68, 0x05, 0x0f, 0x0a }, /* p6 */
761 { 0x38, 0x0f, 0x00, 0x00 }, /* p7 */
762 { 0x48, 0x09, 0x06, 0x06 }, /* p8 */
763 { 0x60, 0x05, 0x0f, 0x0a }, /* p9 */
764 { 0x38, 0x0f, 0x00, 0x00 }, /* p10 */
767 static const u8 integrated_ctle_tunings[11][4] = {
769 { 0x38, 0x0f, 0x00, 0x00 }, /* p0 */
770 { 0x38, 0x0f, 0x00, 0x00 }, /* p1 */
771 { 0x38, 0x0f, 0x00, 0x00 }, /* p2 */
772 { 0x38, 0x0f, 0x00, 0x00 }, /* p3 */
773 { 0x58, 0x0a, 0x05, 0x05 }, /* p4 */
774 { 0x48, 0x0a, 0x05, 0x05 }, /* p5 */
775 { 0x40, 0x0a, 0x05, 0x05 }, /* p6 */
776 { 0x38, 0x0f, 0x00, 0x00 }, /* p7 */
777 { 0x38, 0x0f, 0x00, 0x00 }, /* p8 */
778 { 0x38, 0x09, 0x06, 0x06 }, /* p9 */
779 { 0x38, 0x0e, 0x01, 0x01 }, /* p10 */
782 /* helper to format the value to write to hardware */
783 #define eq_value(pre, curr, post) \
785 PCIE_CFG_REG_PL102_GEN3_EQ_PRE_CURSOR_PSET_SHIFT) \
786 | (((u32)(curr)) << PCIE_CFG_REG_PL102_GEN3_EQ_CURSOR_PSET_SHIFT) \
787 | (((u32)(post)) << \
788 PCIE_CFG_REG_PL102_GEN3_EQ_POST_CURSOR_PSET_SHIFT))
791 * Load the given EQ preset table into the PCIe hardware.
793 static int load_eq_table(struct hfi1_devdata *dd, const u8 eq[11][3], u8 fs,
796 struct pci_dev *pdev = dd->pcidev;
800 u8 c_minus1, c0, c_plus1;
803 for (i = 0; i < 11; i++) {
805 pci_write_config_dword(pdev, PCIE_CFG_REG_PL103, i);
806 /* write the value */
807 c_minus1 = eq[i][PREC] / div;
808 c0 = fs - (eq[i][PREC] / div) - (eq[i][POST] / div);
809 c_plus1 = eq[i][POST] / div;
810 pci_write_config_dword(pdev, PCIE_CFG_REG_PL102,
811 eq_value(c_minus1, c0, c_plus1));
812 /* check if these coefficients violate EQ rules */
813 ret = pci_read_config_dword(dd->pcidev,
814 PCIE_CFG_REG_PL105, &violation);
816 dd_dev_err(dd, "Unable to read from PCI config\n");
822 & PCIE_CFG_REG_PL105_GEN3_EQ_VIOLATE_COEF_RULES_SMASK){
823 if (hit_error == 0) {
825 "Gen3 EQ Table Coefficient rule violations\n");
826 dd_dev_err(dd, " prec attn post\n");
828 dd_dev_err(dd, " p%02d: %02x %02x %02x\n",
829 i, (u32)eq[i][0], (u32)eq[i][1],
831 dd_dev_err(dd, " %02x %02x %02x\n",
832 (u32)c_minus1, (u32)c0, (u32)c_plus1);
842 * Steps to be done after the PCIe firmware is downloaded and
843 * before the SBR for the Pcie Gen3.
844 * The SBus resource is already being held.
846 static void pcie_post_steps(struct hfi1_devdata *dd)
850 set_sbus_fast_mode(dd);
852 * Write to the PCIe PCSes to set the G3_LOCKED_NEXT bits to 1.
853 * This avoids a spurious framing error that can otherwise be
854 * generated by the MAC layer.
856 * Use individual addresses since no broadcast is set up.
858 for (i = 0; i < NUM_PCIE_SERDES; i++) {
859 sbus_request(dd, pcie_pcs_addrs[dd->hfi1_id][i],
860 0x03, WRITE_SBUS_RECEIVER, 0x00022132);
863 clear_sbus_fast_mode(dd);
867 * Trigger a secondary bus reset (SBR) on ourselves using our parent.
869 * Based on pci_parent_bus_reset() which is not exported by the
872 static int trigger_sbr(struct hfi1_devdata *dd)
874 struct pci_dev *dev = dd->pcidev;
875 struct pci_dev *pdev;
878 if (!dev->bus->self) {
879 dd_dev_err(dd, "%s: no parent device\n", __func__);
883 /* should not be anyone else on the bus */
884 list_for_each_entry(pdev, &dev->bus->devices, bus_list)
887 "%s: another device is on the same bus\n",
893 * A secondary bus reset (SBR) issues a hot reset to our device.
894 * The following routine does a 1s wait after the reset is dropped
895 * per PCI Trhfa (recovery time). PCIe 3.0 section 6.6.1 -
896 * Conventional Reset, paragraph 3, line 35 also says that a 1s
897 * delay after a reset is required. Per spec requirements,
898 * the link is either working or not after that point.
900 pci_reset_bridge_secondary_bus(dev->bus->self);
906 * Write the given gasket interrupt register.
908 static void write_gasket_interrupt(struct hfi1_devdata *dd, int index,
911 write_csr(dd, ASIC_PCIE_SD_INTRPT_LIST + (index * 8),
912 (((u64)code << ASIC_PCIE_SD_INTRPT_LIST_INTRPT_CODE_SHIFT) |
913 ((u64)data << ASIC_PCIE_SD_INTRPT_LIST_INTRPT_DATA_SHIFT)));
917 * Tell the gasket logic how to react to the reset.
919 static void arm_gasket_logic(struct hfi1_devdata *dd)
923 reg = (((u64)1 << dd->hfi1_id) <<
924 ASIC_PCIE_SD_HOST_CMD_INTRPT_CMD_SHIFT) |
925 ((u64)pcie_serdes_broadcast[dd->hfi1_id] <<
926 ASIC_PCIE_SD_HOST_CMD_SBUS_RCVR_ADDR_SHIFT |
927 ASIC_PCIE_SD_HOST_CMD_SBR_MODE_SMASK |
928 ((u64)SBR_DELAY_US & ASIC_PCIE_SD_HOST_CMD_TIMER_MASK) <<
929 ASIC_PCIE_SD_HOST_CMD_TIMER_SHIFT);
930 write_csr(dd, ASIC_PCIE_SD_HOST_CMD, reg);
931 /* read back to push the write */
932 read_csr(dd, ASIC_PCIE_SD_HOST_CMD);
936 * CCE_PCIE_CTRL long name helpers
937 * We redefine these shorter macros to use in the code while leaving
938 * chip_registers.h to be autogenerated from the hardware spec.
940 #define LANE_BUNDLE_MASK CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_MASK
941 #define LANE_BUNDLE_SHIFT CCE_PCIE_CTRL_PCIE_LANE_BUNDLE_SHIFT
942 #define LANE_DELAY_MASK CCE_PCIE_CTRL_PCIE_LANE_DELAY_MASK
943 #define LANE_DELAY_SHIFT CCE_PCIE_CTRL_PCIE_LANE_DELAY_SHIFT
944 #define MARGIN_OVERWRITE_ENABLE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_OVERWRITE_ENABLE_SHIFT
945 #define MARGIN_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_SHIFT
946 #define MARGIN_G1_G2_OVERWRITE_MASK CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_MASK
947 #define MARGIN_G1_G2_OVERWRITE_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_OVERWRITE_ENABLE_SHIFT
948 #define MARGIN_GEN1_GEN2_MASK CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_MASK
949 #define MARGIN_GEN1_GEN2_SHIFT CCE_PCIE_CTRL_XMT_MARGIN_GEN1_GEN2_SHIFT
952 * Write xmt_margin for full-swing (WFR-B) or half-swing (WFR-C).
954 static void write_xmt_margin(struct hfi1_devdata *dd, const char *fname)
962 pcie_ctrl = read_csr(dd, CCE_PCIE_CTRL);
965 * For Discrete, use full-swing.
966 * - PCIe TX defaults to full-swing.
967 * Leave this register as default.
968 * For Integrated, use half-swing
969 * - Copy xmt_margin and xmt_margin_oe
970 * from Gen1/Gen2 to Gen3.
972 if (dd->pcidev->device == PCI_DEVICE_ID_INTEL1) { /* integrated */
973 /* extract initial fields */
974 xmt_margin = (pcie_ctrl >> MARGIN_GEN1_GEN2_SHIFT)
975 & MARGIN_GEN1_GEN2_MASK;
976 xmt_margin_oe = (pcie_ctrl >> MARGIN_G1_G2_OVERWRITE_SHIFT)
977 & MARGIN_G1_G2_OVERWRITE_MASK;
978 lane_delay = (pcie_ctrl >> LANE_DELAY_SHIFT) & LANE_DELAY_MASK;
979 lane_bundle = (pcie_ctrl >> LANE_BUNDLE_SHIFT)
983 * For A0, EFUSE values are not set. Override with the
988 * xmt_margin and OverwiteEnabel should be the
989 * same for Gen1/Gen2 and Gen3
993 lane_delay = 0xF; /* Delay 240ns. */
994 lane_bundle = 0x0; /* Set to 1 lane. */
997 /* overwrite existing values */
998 pcie_ctrl = (xmt_margin << MARGIN_GEN1_GEN2_SHIFT)
999 | (xmt_margin_oe << MARGIN_G1_G2_OVERWRITE_SHIFT)
1000 | (xmt_margin << MARGIN_SHIFT)
1001 | (xmt_margin_oe << MARGIN_OVERWRITE_ENABLE_SHIFT)
1002 | (lane_delay << LANE_DELAY_SHIFT)
1003 | (lane_bundle << LANE_BUNDLE_SHIFT);
1005 write_csr(dd, CCE_PCIE_CTRL, pcie_ctrl);
1008 dd_dev_dbg(dd, "%s: program XMT margin, CcePcieCtrl 0x%llx\n",
1013 * Do all the steps needed to transition the PCIe link to Gen3 speed.
1015 int do_pcie_gen3_transition(struct hfi1_devdata *dd)
1017 struct pci_dev *parent = dd->pcidev->bus->self;
1023 int do_retry, retry_count = 0;
1026 uint pset = pcie_pset;
1027 u16 target_vector, target_speed;
1028 u16 lnkctl2, vendor;
1031 const u8 (*ctle_tunings)[4];
1032 uint static_ctle_mode;
1033 int return_error = 0;
1035 /* PCIe Gen3 is for the ASIC only */
1036 if (dd->icode != ICODE_RTL_SILICON)
1039 if (pcie_target == 1) { /* target Gen1 */
1040 target_vector = PCI_EXP_LNKCTL2_TLS_2_5GT;
1041 target_speed = 2500;
1042 } else if (pcie_target == 2) { /* target Gen2 */
1043 target_vector = PCI_EXP_LNKCTL2_TLS_5_0GT;
1044 target_speed = 5000;
1045 } else if (pcie_target == 3) { /* target Gen3 */
1046 target_vector = PCI_EXP_LNKCTL2_TLS_8_0GT;
1047 target_speed = 8000;
1049 /* off or invalid target - skip */
1050 dd_dev_info(dd, "%s: Skipping PCIe transition\n", __func__);
1054 /* if already at target speed, done (unless forced) */
1055 if (dd->lbus_speed == target_speed) {
1056 dd_dev_info(dd, "%s: PCIe already at gen%d, %s\n", __func__,
1058 pcie_force ? "re-doing anyway" : "skipping");
1064 * The driver cannot do the transition if it has no access to the
1065 * upstream component
1068 dd_dev_info(dd, "%s: No upstream, Can't do gen3 transition\n",
1074 * Do the Gen3 transition. Steps are those of the PCIe Gen3
1078 /* step 1: pcie link working in gen1/gen2 */
1080 /* step 2: if either side is not capable of Gen3, done */
1081 if (pcie_target == 3 && !dd->link_gen3_capable) {
1082 dd_dev_err(dd, "The PCIe link is not Gen3 capable\n");
1087 /* hold the SBus resource across the firmware download and SBR */
1088 ret = acquire_chip_resource(dd, CR_SBUS, SBUS_TIMEOUT);
1090 dd_dev_err(dd, "%s: unable to acquire SBus resource\n",
1095 /* make sure thermal polling is not causing interrupts */
1096 therm = read_csr(dd, ASIC_CFG_THERM_POLL_EN);
1098 write_csr(dd, ASIC_CFG_THERM_POLL_EN, 0x0);
1100 dd_dev_info(dd, "%s: Disabled therm polling\n",
1105 /* the SBus download will reset the spico for thermal */
1107 /* step 3: download SBus Master firmware */
1108 /* step 4: download PCIe Gen3 SerDes firmware */
1109 dd_dev_info(dd, "%s: downloading firmware\n", __func__);
1110 ret = load_pcie_firmware(dd);
1112 /* do not proceed if the firmware cannot be downloaded */
1117 /* step 5: set up device parameter settings */
1118 dd_dev_info(dd, "%s: setting PCIe registers\n", __func__);
1121 * PcieCfgSpcie1 - Link Control 3
1122 * Leave at reset value. No need to set PerfEq - link equalization
1123 * will be performed automatically after the SBR when the target
1127 /* clear all 16 per-lane error bits (PCIe: Lane Error Status) */
1128 pci_write_config_dword(dd->pcidev, PCIE_CFG_SPCIE2, 0xffff);
1130 /* step 5a: Set Synopsys Port Logic registers */
1133 * PcieCfgRegPl2 - Port Force Link
1135 * Set the low power field to 0x10 to avoid unnecessary power
1136 * management messages. All other fields are zero.
1138 reg32 = 0x10ul << PCIE_CFG_REG_PL2_LOW_PWR_ENT_CNT_SHIFT;
1139 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL2, reg32);
1142 * PcieCfgRegPl100 - Gen3 Control
1144 * turn off PcieCfgRegPl100.Gen3ZRxDcNonCompl
1145 * turn on PcieCfgRegPl100.EqEieosCnt
1146 * Everything else zero.
1148 reg32 = PCIE_CFG_REG_PL100_EQ_EIEOS_CNT_SMASK;
1149 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL100, reg32);
1152 * PcieCfgRegPl101 - Gen3 EQ FS and LF
1153 * PcieCfgRegPl102 - Gen3 EQ Presets to Coefficients Mapping
1154 * PcieCfgRegPl103 - Gen3 EQ Preset Index
1155 * PcieCfgRegPl105 - Gen3 EQ Status
1157 * Give initial EQ settings.
1159 if (dd->pcidev->device == PCI_DEVICE_ID_INTEL0) { /* discrete */
1160 /* 1000mV, FS=24, LF = 8 */
1164 eq = discrete_preliminary_eq;
1165 default_pset = DEFAULT_DISCRETE_PSET;
1166 ctle_tunings = discrete_ctle_tunings;
1167 /* bit 0 - discrete on/off */
1168 static_ctle_mode = pcie_ctle & 0x1;
1170 /* 400mV, FS=29, LF = 9 */
1174 eq = integrated_preliminary_eq;
1175 default_pset = DEFAULT_MCP_PSET;
1176 ctle_tunings = integrated_ctle_tunings;
1177 /* bit 1 - integrated on/off */
1178 static_ctle_mode = (pcie_ctle >> 1) & 0x1;
1180 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL101,
1182 PCIE_CFG_REG_PL101_GEN3_EQ_LOCAL_FS_SHIFT) |
1184 PCIE_CFG_REG_PL101_GEN3_EQ_LOCAL_LF_SHIFT));
1185 ret = load_eq_table(dd, eq, fs, div);
1190 * PcieCfgRegPl106 - Gen3 EQ Control
1192 * Set Gen3EqPsetReqVec, leave other fields 0.
1194 if (pset == UNSET_PSET)
1195 pset = default_pset;
1196 if (pset > 10) { /* valid range is 0-10, inclusive */
1197 dd_dev_err(dd, "%s: Invalid Eq Pset %u, setting to %d\n",
1198 __func__, pset, default_pset);
1199 pset = default_pset;
1201 dd_dev_info(dd, "%s: using EQ Pset %u\n", __func__, pset);
1202 pci_write_config_dword(dd->pcidev, PCIE_CFG_REG_PL106,
1204 PCIE_CFG_REG_PL106_GEN3_EQ_PSET_REQ_VEC_SHIFT) |
1205 PCIE_CFG_REG_PL106_GEN3_EQ_EVAL2MS_DISABLE_SMASK |
1206 PCIE_CFG_REG_PL106_GEN3_EQ_PHASE23_EXIT_MODE_SMASK);
1209 * step 5b: Do post firmware download steps via SBus
1211 dd_dev_info(dd, "%s: doing pcie post steps\n", __func__);
1212 pcie_post_steps(dd);
1215 * step 5c: Program gasket interrupts
1217 /* set the Rx Bit Rate to REFCLK ratio */
1218 write_gasket_interrupt(dd, intnum++, 0x0006, 0x0050);
1219 /* disable pCal for PCIe Gen3 RX equalization */
1220 /* select adaptive or static CTLE */
1221 write_gasket_interrupt(dd, intnum++, 0x0026,
1222 0x5b01 | (static_ctle_mode << 3));
1224 * Enable iCal for PCIe Gen3 RX equalization, and set which
1225 * evaluation of RX_EQ_EVAL will launch the iCal procedure.
1227 write_gasket_interrupt(dd, intnum++, 0x0026, 0x5202);
1229 if (static_ctle_mode) {
1230 /* apply static CTLE tunings */
1231 u8 pcie_dc, pcie_lf, pcie_hf, pcie_bw;
1233 pcie_dc = ctle_tunings[pset][0];
1234 pcie_lf = ctle_tunings[pset][1];
1235 pcie_hf = ctle_tunings[pset][2];
1236 pcie_bw = ctle_tunings[pset][3];
1237 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0200 | pcie_dc);
1238 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0100 | pcie_lf);
1239 write_gasket_interrupt(dd, intnum++, 0x0026, 0x0000 | pcie_hf);
1240 write_gasket_interrupt(dd, intnum++, 0x0026, 0x5500 | pcie_bw);
1243 /* terminate list */
1244 write_gasket_interrupt(dd, intnum++, 0x0000, 0x0000);
1247 * step 5d: program XMT margin
1249 write_xmt_margin(dd, __func__);
1252 * step 5e: disable active state power management (ASPM). It
1253 * will be enabled if required later
1255 dd_dev_info(dd, "%s: clearing ASPM\n", __func__);
1256 aspm_hw_disable_l1(dd);
1259 * step 5f: clear DirectSpeedChange
1260 * PcieCfgRegPl67.DirectSpeedChange must be zero to prevent the
1261 * change in the speed target from starting before we are ready.
1262 * This field defaults to 0 and we are not changing it, so nothing
1266 /* step 5g: Set target link speed */
1268 * Set target link speed to be target on both device and parent.
1269 * On setting the parent: Some system BIOSs "helpfully" set the
1270 * parent target speed to Gen2 to match the ASIC's initial speed.
1271 * We can set the target Gen3 because we have already checked
1272 * that it is Gen3 capable earlier.
1274 dd_dev_info(dd, "%s: setting parent target link speed\n", __func__);
1275 ret = pcie_capability_read_word(parent, PCI_EXP_LNKCTL2, &lnkctl2);
1277 dd_dev_err(dd, "Unable to read from PCI config\n");
1282 dd_dev_info(dd, "%s: ..old link control2: 0x%x\n", __func__,
1284 /* only write to parent if target is not as high as ours */
1285 if ((lnkctl2 & PCI_EXP_LNKCTL2_TLS) < target_vector) {
1286 lnkctl2 &= ~PCI_EXP_LNKCTL2_TLS;
1287 lnkctl2 |= target_vector;
1288 dd_dev_info(dd, "%s: ..new link control2: 0x%x\n", __func__,
1290 ret = pcie_capability_write_word(parent,
1291 PCI_EXP_LNKCTL2, lnkctl2);
1293 dd_dev_err(dd, "Unable to write to PCI config\n");
1298 dd_dev_info(dd, "%s: ..target speed is OK\n", __func__);
1301 dd_dev_info(dd, "%s: setting target link speed\n", __func__);
1302 ret = pcie_capability_read_word(dd->pcidev, PCI_EXP_LNKCTL2, &lnkctl2);
1304 dd_dev_err(dd, "Unable to read from PCI config\n");
1309 dd_dev_info(dd, "%s: ..old link control2: 0x%x\n", __func__,
1311 lnkctl2 &= ~PCI_EXP_LNKCTL2_TLS;
1312 lnkctl2 |= target_vector;
1313 dd_dev_info(dd, "%s: ..new link control2: 0x%x\n", __func__,
1315 ret = pcie_capability_write_word(dd->pcidev, PCI_EXP_LNKCTL2, lnkctl2);
1317 dd_dev_err(dd, "Unable to write to PCI config\n");
1322 /* step 5h: arm gasket logic */
1323 /* hold DC in reset across the SBR */
1324 write_csr(dd, CCE_DC_CTRL, CCE_DC_CTRL_DC_RESET_SMASK);
1325 (void)read_csr(dd, CCE_DC_CTRL); /* DC reset hold */
1326 /* save firmware control across the SBR */
1327 fw_ctrl = read_csr(dd, MISC_CFG_FW_CTRL);
1329 dd_dev_info(dd, "%s: arming gasket logic\n", __func__);
1330 arm_gasket_logic(dd);
1333 * step 6: quiesce PCIe link
1334 * The chip has already been reset, so there will be no traffic
1335 * from the chip. Linux has no easy way to enforce that it will
1336 * not try to access the device, so we just need to hope it doesn't
1337 * do it while we are doing the reset.
1341 * step 7: initiate the secondary bus reset (SBR)
1342 * step 8: hardware brings the links back up
1343 * step 9: wait for link speed transition to be complete
1345 dd_dev_info(dd, "%s: calling trigger_sbr\n", __func__);
1346 ret = trigger_sbr(dd);
1350 /* step 10: decide what to do next */
1352 /* check if we can read PCI space */
1353 ret = pci_read_config_word(dd->pcidev, PCI_VENDOR_ID, &vendor);
1356 "%s: read of VendorID failed after SBR, err %d\n",
1361 if (vendor == 0xffff) {
1362 dd_dev_info(dd, "%s: VendorID is all 1s after SBR\n", __func__);
1368 /* restore PCI space registers we know were reset */
1369 dd_dev_info(dd, "%s: calling restore_pci_variables\n", __func__);
1370 ret = restore_pci_variables(dd);
1372 dd_dev_err(dd, "%s: Could not restore PCI variables\n",
1378 /* restore firmware control */
1379 write_csr(dd, MISC_CFG_FW_CTRL, fw_ctrl);
1382 * Check the gasket block status.
1384 * This is the first CSR read after the SBR. If the read returns
1385 * all 1s (fails), the link did not make it back.
1387 * Once we're sure we can read and write, clear the DC reset after
1388 * the SBR. Then check for any per-lane errors. Then look over
1391 reg = read_csr(dd, ASIC_PCIE_SD_HOST_STATUS);
1392 dd_dev_info(dd, "%s: gasket block status: 0x%llx\n", __func__, reg);
1393 if (reg == ~0ull) { /* PCIe read failed/timeout */
1394 dd_dev_err(dd, "SBR failed - unable to read from device\n");
1400 /* clear the DC reset */
1401 write_csr(dd, CCE_DC_CTRL, 0);
1403 /* Set the LED off */
1406 /* check for any per-lane errors */
1407 ret = pci_read_config_dword(dd->pcidev, PCIE_CFG_SPCIE2, ®32);
1409 dd_dev_err(dd, "Unable to read from PCI config\n");
1414 dd_dev_info(dd, "%s: per-lane errors: 0x%x\n", __func__, reg32);
1416 /* extract status, look for our HFI */
1417 status = (reg >> ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_STS_SHIFT)
1418 & ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_STS_MASK;
1419 if ((status & (1 << dd->hfi1_id)) == 0) {
1421 "%s: gasket status 0x%x, expecting 0x%x\n",
1422 __func__, status, 1 << dd->hfi1_id);
1428 err = (reg >> ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_ERR_SHIFT)
1429 & ASIC_PCIE_SD_HOST_STATUS_FW_DNLD_ERR_MASK;
1431 dd_dev_err(dd, "%s: gasket error %d\n", __func__, err);
1436 /* update our link information cache */
1437 update_lbus_info(dd);
1438 dd_dev_info(dd, "%s: new speed and width: %s\n", __func__,
1441 if (dd->lbus_speed != target_speed) { /* not target */
1443 do_retry = retry_count < pcie_retry;
1444 dd_dev_err(dd, "PCIe link speed did not switch to Gen%d%s\n",
1445 pcie_target, do_retry ? ", retrying" : "");
1448 msleep(100); /* allow time to settle */
1456 write_csr(dd, ASIC_CFG_THERM_POLL_EN, 0x1);
1458 dd_dev_info(dd, "%s: Re-enable therm polling\n",
1461 release_chip_resource(dd, CR_SBUS);
1463 /* return no error if it is OK to be at current speed */
1464 if (ret && !return_error) {
1465 dd_dev_err(dd, "Proceeding at current speed PCIe speed\n");
1469 dd_dev_info(dd, "%s: done\n", __func__);