1 // SPDX-License-Identifier: GPL-2.0
3 * Synopsys DesignWare PCIe host controller driver
5 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
6 * https://www.samsung.com
8 * Author: Jingoo Han <jg1.han@samsung.com>
11 #include <linux/align.h>
12 #include <linux/bitops.h>
13 #include <linux/clk.h>
14 #include <linux/delay.h>
15 #include <linux/dma/edma.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/ioport.h>
19 #include <linux/platform_device.h>
20 #include <linux/sizes.h>
21 #include <linux/types.h>
23 #include "../../pci.h"
24 #include "pcie-designware.h"
26 static const char * const dw_pcie_app_clks[DW_PCIE_NUM_APP_CLKS] = {
27 [DW_PCIE_DBI_CLK] = "dbi",
28 [DW_PCIE_MSTR_CLK] = "mstr",
29 [DW_PCIE_SLV_CLK] = "slv",
32 static const char * const dw_pcie_core_clks[DW_PCIE_NUM_CORE_CLKS] = {
33 [DW_PCIE_PIPE_CLK] = "pipe",
34 [DW_PCIE_CORE_CLK] = "core",
35 [DW_PCIE_AUX_CLK] = "aux",
36 [DW_PCIE_REF_CLK] = "ref",
39 static const char * const dw_pcie_app_rsts[DW_PCIE_NUM_APP_RSTS] = {
40 [DW_PCIE_DBI_RST] = "dbi",
41 [DW_PCIE_MSTR_RST] = "mstr",
42 [DW_PCIE_SLV_RST] = "slv",
45 static const char * const dw_pcie_core_rsts[DW_PCIE_NUM_CORE_RSTS] = {
46 [DW_PCIE_NON_STICKY_RST] = "non-sticky",
47 [DW_PCIE_STICKY_RST] = "sticky",
48 [DW_PCIE_CORE_RST] = "core",
49 [DW_PCIE_PIPE_RST] = "pipe",
50 [DW_PCIE_PHY_RST] = "phy",
51 [DW_PCIE_HOT_RST] = "hot",
52 [DW_PCIE_PWR_RST] = "pwr",
55 static int dw_pcie_get_clocks(struct dw_pcie *pci)
59 for (i = 0; i < DW_PCIE_NUM_APP_CLKS; i++)
60 pci->app_clks[i].id = dw_pcie_app_clks[i];
62 for (i = 0; i < DW_PCIE_NUM_CORE_CLKS; i++)
63 pci->core_clks[i].id = dw_pcie_core_clks[i];
65 ret = devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_APP_CLKS,
70 return devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_CORE_CLKS,
74 static int dw_pcie_get_resets(struct dw_pcie *pci)
78 for (i = 0; i < DW_PCIE_NUM_APP_RSTS; i++)
79 pci->app_rsts[i].id = dw_pcie_app_rsts[i];
81 for (i = 0; i < DW_PCIE_NUM_CORE_RSTS; i++)
82 pci->core_rsts[i].id = dw_pcie_core_rsts[i];
84 ret = devm_reset_control_bulk_get_optional_shared(pci->dev,
90 ret = devm_reset_control_bulk_get_optional_exclusive(pci->dev,
91 DW_PCIE_NUM_CORE_RSTS,
96 pci->pe_rst = devm_gpiod_get_optional(pci->dev, "reset", GPIOD_OUT_HIGH);
97 if (IS_ERR(pci->pe_rst))
98 return PTR_ERR(pci->pe_rst);
103 int dw_pcie_get_resources(struct dw_pcie *pci)
105 struct platform_device *pdev = to_platform_device(pci->dev);
106 struct device_node *np = dev_of_node(pci->dev);
107 struct resource *res;
110 if (!pci->dbi_base) {
111 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
112 pci->dbi_base = devm_pci_remap_cfg_resource(pci->dev, res);
113 if (IS_ERR(pci->dbi_base))
114 return PTR_ERR(pci->dbi_base);
117 /* DBI2 is mainly useful for the endpoint controller */
118 if (!pci->dbi_base2) {
119 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi2");
121 pci->dbi_base2 = devm_pci_remap_cfg_resource(pci->dev, res);
122 if (IS_ERR(pci->dbi_base2))
123 return PTR_ERR(pci->dbi_base2);
125 pci->dbi_base2 = pci->dbi_base + SZ_4K;
129 /* For non-unrolled iATU/eDMA platforms this range will be ignored */
130 if (!pci->atu_base) {
131 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
133 pci->atu_size = resource_size(res);
134 pci->atu_base = devm_ioremap_resource(pci->dev, res);
135 if (IS_ERR(pci->atu_base))
136 return PTR_ERR(pci->atu_base);
138 pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
142 /* Set a default value suitable for at most 8 in and 8 out windows */
144 pci->atu_size = SZ_4K;
146 /* eDMA region can be mapped to a custom base address */
147 if (!pci->edma.reg_base) {
148 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
150 pci->edma.reg_base = devm_ioremap_resource(pci->dev, res);
151 if (IS_ERR(pci->edma.reg_base))
152 return PTR_ERR(pci->edma.reg_base);
153 } else if (pci->atu_size >= 2 * DEFAULT_DBI_DMA_OFFSET) {
154 pci->edma.reg_base = pci->atu_base + DEFAULT_DBI_DMA_OFFSET;
158 /* LLDD is supposed to manually switch the clocks and resets state */
159 if (dw_pcie_cap_is(pci, REQ_RES)) {
160 ret = dw_pcie_get_clocks(pci);
164 ret = dw_pcie_get_resets(pci);
169 if (pci->link_gen < 1)
170 pci->link_gen = of_pci_get_max_link_speed(np);
172 of_property_read_u32(np, "num-lanes", &pci->num_lanes);
174 if (of_property_read_bool(np, "snps,enable-cdm-check"))
175 dw_pcie_cap_set(pci, CDM_CHECK);
180 void dw_pcie_version_detect(struct dw_pcie *pci)
184 /* The content of the CSR is zero on DWC PCIe older than v4.70a */
185 ver = dw_pcie_readl_dbi(pci, PCIE_VERSION_NUMBER);
189 if (pci->version && pci->version != ver)
190 dev_warn(pci->dev, "Versions don't match (%08x != %08x)\n",
195 ver = dw_pcie_readl_dbi(pci, PCIE_VERSION_TYPE);
197 if (pci->type && pci->type != ver)
198 dev_warn(pci->dev, "Types don't match (%08x != %08x)\n",
205 * These interfaces resemble the pci_find_*capability() interfaces, but these
206 * are for configuring host controllers, which are bridges *to* PCI devices but
207 * are not PCI devices themselves.
209 static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr,
212 u8 cap_id, next_cap_ptr;
218 reg = dw_pcie_readw_dbi(pci, cap_ptr);
219 cap_id = (reg & 0x00ff);
221 if (cap_id > PCI_CAP_ID_MAX)
227 next_cap_ptr = (reg & 0xff00) >> 8;
228 return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
231 u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap)
236 reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST);
237 next_cap_ptr = (reg & 0x00ff);
239 return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
241 EXPORT_SYMBOL_GPL(dw_pcie_find_capability);
243 static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start,
248 int pos = PCI_CFG_SPACE_SIZE;
250 /* minimum 8 bytes per capability */
251 ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
256 header = dw_pcie_readl_dbi(pci, pos);
258 * If we have no capabilities, this is indicated by cap ID,
259 * cap version and next pointer all being 0.
265 if (PCI_EXT_CAP_ID(header) == cap && pos != start)
268 pos = PCI_EXT_CAP_NEXT(header);
269 if (pos < PCI_CFG_SPACE_SIZE)
272 header = dw_pcie_readl_dbi(pci, pos);
278 u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap)
280 return dw_pcie_find_next_ext_capability(pci, 0, cap);
282 EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability);
284 int dw_pcie_read(void __iomem *addr, int size, u32 *val)
286 if (!IS_ALIGNED((uintptr_t)addr, size)) {
288 return PCIBIOS_BAD_REGISTER_NUMBER;
293 } else if (size == 2) {
295 } else if (size == 1) {
299 return PCIBIOS_BAD_REGISTER_NUMBER;
302 return PCIBIOS_SUCCESSFUL;
304 EXPORT_SYMBOL_GPL(dw_pcie_read);
306 int dw_pcie_write(void __iomem *addr, int size, u32 val)
308 if (!IS_ALIGNED((uintptr_t)addr, size))
309 return PCIBIOS_BAD_REGISTER_NUMBER;
318 return PCIBIOS_BAD_REGISTER_NUMBER;
320 return PCIBIOS_SUCCESSFUL;
322 EXPORT_SYMBOL_GPL(dw_pcie_write);
324 u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
329 if (pci->ops && pci->ops->read_dbi)
330 return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);
332 ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
334 dev_err(pci->dev, "Read DBI address failed\n");
338 EXPORT_SYMBOL_GPL(dw_pcie_read_dbi);
340 void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
344 if (pci->ops && pci->ops->write_dbi) {
345 pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
349 ret = dw_pcie_write(pci->dbi_base + reg, size, val);
351 dev_err(pci->dev, "Write DBI address failed\n");
353 EXPORT_SYMBOL_GPL(dw_pcie_write_dbi);
355 void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
359 if (pci->ops && pci->ops->write_dbi2) {
360 pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val);
364 ret = dw_pcie_write(pci->dbi_base2 + reg, size, val);
366 dev_err(pci->dev, "write DBI address failed\n");
368 EXPORT_SYMBOL_GPL(dw_pcie_write_dbi2);
370 static inline void __iomem *dw_pcie_select_atu(struct dw_pcie *pci, u32 dir,
373 if (dw_pcie_cap_is(pci, IATU_UNROLL))
374 return pci->atu_base + PCIE_ATU_UNROLL_BASE(dir, index);
376 dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, dir | index);
377 return pci->atu_base;
380 static u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 dir, u32 index, u32 reg)
386 base = dw_pcie_select_atu(pci, dir, index);
388 if (pci->ops && pci->ops->read_dbi)
389 return pci->ops->read_dbi(pci, base, reg, 4);
391 ret = dw_pcie_read(base + reg, 4, &val);
393 dev_err(pci->dev, "Read ATU address failed\n");
398 static void dw_pcie_writel_atu(struct dw_pcie *pci, u32 dir, u32 index,
404 base = dw_pcie_select_atu(pci, dir, index);
406 if (pci->ops && pci->ops->write_dbi) {
407 pci->ops->write_dbi(pci, base, reg, 4, val);
411 ret = dw_pcie_write(base + reg, 4, val);
413 dev_err(pci->dev, "Write ATU address failed\n");
416 static inline u32 dw_pcie_readl_atu_ob(struct dw_pcie *pci, u32 index, u32 reg)
418 return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_OB, index, reg);
421 static inline void dw_pcie_writel_atu_ob(struct dw_pcie *pci, u32 index, u32 reg,
424 dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_OB, index, reg, val);
427 static inline u32 dw_pcie_enable_ecrc(u32 val)
430 * DesignWare core version 4.90A has a design issue where the 'TD'
431 * bit in the Control register-1 of the ATU outbound region acts
432 * like an override for the ECRC setting, i.e., the presence of TLP
433 * Digest (ECRC) in the outgoing TLPs is solely determined by this
434 * bit. This is contrary to the PCIe spec which says that the
435 * enablement of the ECRC is solely determined by the AER
438 * Because of this, even when the ECRC is enabled through AER
439 * registers, the transactions going through ATU won't have TLP
440 * Digest as there is no way the PCI core AER code could program
441 * the TD bit which is specific to the DesignWare core.
443 * The best way to handle this scenario is to program the TD bit
444 * always. It affects only the traffic from root port to downstream
448 * When ECRC is enabled in AER registers, everything works normally
449 * When ECRC is NOT enabled in AER registers, then,
450 * on Root Port:- TLP Digest (DWord size) gets appended to each packet
451 * even through it is not required. Since downstream
452 * TLPs are mostly for configuration accesses and BAR
453 * accesses, they are not in critical path and won't
454 * have much negative effect on the performance.
455 * on End Point:- TLP Digest is received for some/all the packets coming
456 * from the root port. TLP Digest is ignored because,
457 * as per the PCIe Spec r5.0 v1.0 section 2.2.3
458 * "TLP Digest Rules", when an endpoint receives TLP
459 * Digest when its ECRC check functionality is disabled
460 * in AER registers, received TLP Digest is just ignored.
461 * Since there is no issue or error reported either side, best way to
462 * handle the scenario is to program TD bit by default.
465 return val | PCIE_ATU_TD;
468 static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
469 int index, int type, u64 cpu_addr,
470 u64 pci_addr, u64 size)
475 if (pci->ops && pci->ops->cpu_addr_fixup)
476 cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
478 limit_addr = cpu_addr + size - 1;
480 if ((limit_addr & ~pci->region_limit) != (cpu_addr & ~pci->region_limit) ||
481 !IS_ALIGNED(cpu_addr, pci->region_align) ||
482 !IS_ALIGNED(pci_addr, pci->region_align) || !size) {
486 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_BASE,
487 lower_32_bits(cpu_addr));
488 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_BASE,
489 upper_32_bits(cpu_addr));
491 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LIMIT,
492 lower_32_bits(limit_addr));
493 if (dw_pcie_ver_is_ge(pci, 460A))
494 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_LIMIT,
495 upper_32_bits(limit_addr));
497 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_TARGET,
498 lower_32_bits(pci_addr));
499 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_TARGET,
500 upper_32_bits(pci_addr));
502 val = type | PCIE_ATU_FUNC_NUM(func_no);
503 if (upper_32_bits(limit_addr) > upper_32_bits(cpu_addr) &&
504 dw_pcie_ver_is_ge(pci, 460A))
505 val |= PCIE_ATU_INCREASE_REGION_SIZE;
506 if (dw_pcie_ver_is(pci, 490A))
507 val = dw_pcie_enable_ecrc(val);
508 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL1, val);
510 dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
513 * Make sure ATU enable takes effect before any subsequent config
516 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
517 val = dw_pcie_readl_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2);
518 if (val & PCIE_ATU_ENABLE)
521 mdelay(LINK_WAIT_IATU);
524 dev_err(pci->dev, "Outbound iATU is not being enabled\n");
529 int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
530 u64 cpu_addr, u64 pci_addr, u64 size)
532 return __dw_pcie_prog_outbound_atu(pci, 0, index, type,
533 cpu_addr, pci_addr, size);
536 int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
537 int type, u64 cpu_addr, u64 pci_addr,
540 return __dw_pcie_prog_outbound_atu(pci, func_no, index, type,
541 cpu_addr, pci_addr, size);
544 static inline u32 dw_pcie_readl_atu_ib(struct dw_pcie *pci, u32 index, u32 reg)
546 return dw_pcie_readl_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg);
549 static inline void dw_pcie_writel_atu_ib(struct dw_pcie *pci, u32 index, u32 reg,
552 dw_pcie_writel_atu(pci, PCIE_ATU_REGION_DIR_IB, index, reg, val);
555 int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type,
556 u64 cpu_addr, u64 pci_addr, u64 size)
558 u64 limit_addr = pci_addr + size - 1;
561 if ((limit_addr & ~pci->region_limit) != (pci_addr & ~pci->region_limit) ||
562 !IS_ALIGNED(cpu_addr, pci->region_align) ||
563 !IS_ALIGNED(pci_addr, pci->region_align) || !size) {
567 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_BASE,
568 lower_32_bits(pci_addr));
569 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_BASE,
570 upper_32_bits(pci_addr));
572 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LIMIT,
573 lower_32_bits(limit_addr));
574 if (dw_pcie_ver_is_ge(pci, 460A))
575 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_LIMIT,
576 upper_32_bits(limit_addr));
578 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET,
579 lower_32_bits(cpu_addr));
580 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET,
581 upper_32_bits(cpu_addr));
584 if (upper_32_bits(limit_addr) > upper_32_bits(pci_addr) &&
585 dw_pcie_ver_is_ge(pci, 460A))
586 val |= PCIE_ATU_INCREASE_REGION_SIZE;
587 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, val);
588 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
591 * Make sure ATU enable takes effect before any subsequent config
594 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
595 val = dw_pcie_readl_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2);
596 if (val & PCIE_ATU_ENABLE)
599 mdelay(LINK_WAIT_IATU);
602 dev_err(pci->dev, "Inbound iATU is not being enabled\n");
607 int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
608 int type, u64 cpu_addr, u8 bar)
612 if (!IS_ALIGNED(cpu_addr, pci->region_align))
615 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET,
616 lower_32_bits(cpu_addr));
617 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET,
618 upper_32_bits(cpu_addr));
620 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL1, type |
621 PCIE_ATU_FUNC_NUM(func_no));
622 dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2,
623 PCIE_ATU_ENABLE | PCIE_ATU_FUNC_NUM_MATCH_EN |
624 PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
627 * Make sure ATU enable takes effect before any subsequent config
630 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
631 val = dw_pcie_readl_atu_ib(pci, index, PCIE_ATU_REGION_CTRL2);
632 if (val & PCIE_ATU_ENABLE)
635 mdelay(LINK_WAIT_IATU);
638 dev_err(pci->dev, "Inbound iATU is not being enabled\n");
643 void dw_pcie_disable_atu(struct dw_pcie *pci, u32 dir, int index)
645 dw_pcie_writel_atu(pci, dir, index, PCIE_ATU_REGION_CTRL2, 0);
648 int dw_pcie_wait_for_link(struct dw_pcie *pci)
653 /* Check if the link is up or not */
654 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
655 if (dw_pcie_link_up(pci))
658 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
661 if (retries >= LINK_WAIT_MAX_RETRIES) {
662 dev_info(pci->dev, "Phy link never came up\n");
666 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
667 val = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
669 dev_info(pci->dev, "PCIe Gen.%u x%u link up\n",
670 FIELD_GET(PCI_EXP_LNKSTA_CLS, val),
671 FIELD_GET(PCI_EXP_LNKSTA_NLW, val));
675 EXPORT_SYMBOL_GPL(dw_pcie_wait_for_link);
677 int dw_pcie_link_up(struct dw_pcie *pci)
681 if (pci->ops && pci->ops->link_up)
682 return pci->ops->link_up(pci);
684 val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1);
685 return ((val & PCIE_PORT_DEBUG1_LINK_UP) &&
686 (!(val & PCIE_PORT_DEBUG1_LINK_IN_TRAINING)));
688 EXPORT_SYMBOL_GPL(dw_pcie_link_up);
690 void dw_pcie_upconfig_setup(struct dw_pcie *pci)
694 val = dw_pcie_readl_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL);
695 val |= PORT_MLTI_UPCFG_SUPPORT;
696 dw_pcie_writel_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL, val);
698 EXPORT_SYMBOL_GPL(dw_pcie_upconfig_setup);
700 static void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen)
702 u32 cap, ctrl2, link_speed;
703 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
705 cap = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
706 ctrl2 = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCTL2);
707 ctrl2 &= ~PCI_EXP_LNKCTL2_TLS;
709 switch (pcie_link_speed[link_gen]) {
710 case PCIE_SPEED_2_5GT:
711 link_speed = PCI_EXP_LNKCTL2_TLS_2_5GT;
713 case PCIE_SPEED_5_0GT:
714 link_speed = PCI_EXP_LNKCTL2_TLS_5_0GT;
716 case PCIE_SPEED_8_0GT:
717 link_speed = PCI_EXP_LNKCTL2_TLS_8_0GT;
719 case PCIE_SPEED_16_0GT:
720 link_speed = PCI_EXP_LNKCTL2_TLS_16_0GT;
723 /* Use hardware capability */
724 link_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, cap);
725 ctrl2 &= ~PCI_EXP_LNKCTL2_HASD;
729 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCTL2, ctrl2 | link_speed);
731 cap &= ~((u32)PCI_EXP_LNKCAP_SLS);
732 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, cap | link_speed);
736 static void dw_pcie_link_set_max_link_width(struct dw_pcie *pci, u32 num_lanes)
738 u32 lnkcap, lwsc, plc;
744 /* Set the number of lanes */
745 plc = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
746 plc &= ~PORT_LINK_FAST_LINK_MODE;
747 plc &= ~PORT_LINK_MODE_MASK;
749 /* Set link width speed control register */
750 lwsc = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
751 lwsc &= ~PORT_LOGIC_LINK_WIDTH_MASK;
754 plc |= PORT_LINK_MODE_1_LANES;
755 lwsc |= PORT_LOGIC_LINK_WIDTH_1_LANES;
758 plc |= PORT_LINK_MODE_2_LANES;
759 lwsc |= PORT_LOGIC_LINK_WIDTH_2_LANES;
762 plc |= PORT_LINK_MODE_4_LANES;
763 lwsc |= PORT_LOGIC_LINK_WIDTH_4_LANES;
766 plc |= PORT_LINK_MODE_8_LANES;
767 lwsc |= PORT_LOGIC_LINK_WIDTH_8_LANES;
770 dev_err(pci->dev, "num-lanes %u: invalid value\n", num_lanes);
773 dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, plc);
774 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, lwsc);
776 cap = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
777 lnkcap = dw_pcie_readl_dbi(pci, cap + PCI_EXP_LNKCAP);
778 lnkcap &= ~PCI_EXP_LNKCAP_MLW;
779 lnkcap |= FIELD_PREP(PCI_EXP_LNKCAP_MLW, num_lanes);
780 dw_pcie_writel_dbi(pci, cap + PCI_EXP_LNKCAP, lnkcap);
783 void dw_pcie_iatu_detect(struct dw_pcie *pci)
785 int max_region, ob, ib;
789 val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
790 if (val == 0xFFFFFFFF) {
791 dw_pcie_cap_set(pci, IATU_UNROLL);
793 max_region = min((int)pci->atu_size / 512, 256);
795 pci->atu_base = pci->dbi_base + PCIE_ATU_VIEWPORT_BASE;
796 pci->atu_size = PCIE_ATU_VIEWPORT_SIZE;
798 dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, 0xFF);
799 max_region = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT) + 1;
802 for (ob = 0; ob < max_region; ob++) {
803 dw_pcie_writel_atu_ob(pci, ob, PCIE_ATU_LOWER_TARGET, 0x11110000);
804 val = dw_pcie_readl_atu_ob(pci, ob, PCIE_ATU_LOWER_TARGET);
805 if (val != 0x11110000)
809 for (ib = 0; ib < max_region; ib++) {
810 dw_pcie_writel_atu_ib(pci, ib, PCIE_ATU_LOWER_TARGET, 0x11110000);
811 val = dw_pcie_readl_atu_ib(pci, ib, PCIE_ATU_LOWER_TARGET);
812 if (val != 0x11110000)
817 dir = PCIE_ATU_REGION_DIR_OB;
819 dir = PCIE_ATU_REGION_DIR_IB;
821 dev_err(pci->dev, "No iATU regions found\n");
825 dw_pcie_writel_atu(pci, dir, 0, PCIE_ATU_LIMIT, 0x0);
826 min = dw_pcie_readl_atu(pci, dir, 0, PCIE_ATU_LIMIT);
828 if (dw_pcie_ver_is_ge(pci, 460A)) {
829 dw_pcie_writel_atu(pci, dir, 0, PCIE_ATU_UPPER_LIMIT, 0xFFFFFFFF);
830 max = dw_pcie_readl_atu(pci, dir, 0, PCIE_ATU_UPPER_LIMIT);
835 pci->num_ob_windows = ob;
836 pci->num_ib_windows = ib;
837 pci->region_align = 1 << fls(min);
838 pci->region_limit = (max << 32) | (SZ_4G - 1);
840 dev_info(pci->dev, "iATU: unroll %s, %u ob, %u ib, align %uK, limit %lluG\n",
841 dw_pcie_cap_is(pci, IATU_UNROLL) ? "T" : "F",
842 pci->num_ob_windows, pci->num_ib_windows,
843 pci->region_align / SZ_1K, (pci->region_limit + 1) / SZ_1G);
846 static u32 dw_pcie_readl_dma(struct dw_pcie *pci, u32 reg)
851 if (pci->ops && pci->ops->read_dbi)
852 return pci->ops->read_dbi(pci, pci->edma.reg_base, reg, 4);
854 ret = dw_pcie_read(pci->edma.reg_base + reg, 4, &val);
856 dev_err(pci->dev, "Read DMA address failed\n");
861 static int dw_pcie_edma_irq_vector(struct device *dev, unsigned int nr)
863 struct platform_device *pdev = to_platform_device(dev);
867 if (nr >= EDMA_MAX_WR_CH + EDMA_MAX_RD_CH)
870 ret = platform_get_irq_byname_optional(pdev, "dma");
874 snprintf(name, sizeof(name), "dma%u", nr);
876 return platform_get_irq_byname_optional(pdev, name);
879 static struct dw_edma_plat_ops dw_pcie_edma_ops = {
880 .irq_vector = dw_pcie_edma_irq_vector,
883 static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
888 * Indirect eDMA CSRs access has been completely removed since v5.40a
889 * thus no space is now reserved for the eDMA channels viewport and
890 * former DMA CTRL register is no longer fixed to FFs.
892 * Note that Renesas R-Car S4-8's PCIe controllers for unknown reason
893 * have zeros in the eDMA CTRL register even though the HW-manual
894 * explicitly states there must FFs if the unrolled mapping is enabled.
895 * For such cases the low-level drivers are supposed to manually
896 * activate the unrolled mapping to bypass the auto-detection procedure.
898 if (dw_pcie_ver_is_ge(pci, 540A) || dw_pcie_cap_is(pci, EDMA_UNROLL))
901 val = dw_pcie_readl_dbi(pci, PCIE_DMA_VIEWPORT_BASE + PCIE_DMA_CTRL);
903 if (val == 0xFFFFFFFF && pci->edma.reg_base) {
904 pci->edma.mf = EDMA_MF_EDMA_UNROLL;
906 val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
907 } else if (val != 0xFFFFFFFF) {
908 pci->edma.mf = EDMA_MF_EDMA_LEGACY;
910 pci->edma.reg_base = pci->dbi_base + PCIE_DMA_VIEWPORT_BASE;
915 pci->edma.dev = pci->dev;
918 pci->edma.ops = &dw_pcie_edma_ops;
920 pci->edma.flags |= DW_EDMA_CHIP_LOCAL;
922 pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val);
923 pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val);
925 /* Sanity check the channels count if the mapping was incorrect */
926 if (!pci->edma.ll_wr_cnt || pci->edma.ll_wr_cnt > EDMA_MAX_WR_CH ||
927 !pci->edma.ll_rd_cnt || pci->edma.ll_rd_cnt > EDMA_MAX_RD_CH)
933 static int dw_pcie_edma_irq_verify(struct dw_pcie *pci)
935 struct platform_device *pdev = to_platform_device(pci->dev);
936 u16 ch_cnt = pci->edma.ll_wr_cnt + pci->edma.ll_rd_cnt;
940 if (pci->edma.nr_irqs == 1)
942 else if (pci->edma.nr_irqs > 1)
943 return pci->edma.nr_irqs != ch_cnt ? -EINVAL : 0;
945 ret = platform_get_irq_byname_optional(pdev, "dma");
947 pci->edma.nr_irqs = 1;
951 for (; pci->edma.nr_irqs < ch_cnt; pci->edma.nr_irqs++) {
952 snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs);
954 ret = platform_get_irq_byname_optional(pdev, name);
962 static int dw_pcie_edma_ll_alloc(struct dw_pcie *pci)
964 struct dw_edma_region *ll;
968 for (i = 0; i < pci->edma.ll_wr_cnt; i++) {
969 ll = &pci->edma.ll_region_wr[i];
970 ll->sz = DMA_LLP_MEM_SIZE;
971 ll->vaddr.mem = dmam_alloc_coherent(pci->dev, ll->sz,
979 for (i = 0; i < pci->edma.ll_rd_cnt; i++) {
980 ll = &pci->edma.ll_region_rd[i];
981 ll->sz = DMA_LLP_MEM_SIZE;
982 ll->vaddr.mem = dmam_alloc_coherent(pci->dev, ll->sz,
993 int dw_pcie_edma_detect(struct dw_pcie *pci)
997 /* Don't fail if no eDMA was found (for the backward compatibility) */
998 ret = dw_pcie_edma_find_chip(pci);
1002 /* Don't fail on the IRQs verification (for the backward compatibility) */
1003 ret = dw_pcie_edma_irq_verify(pci);
1005 dev_err(pci->dev, "Invalid eDMA IRQs found\n");
1009 ret = dw_pcie_edma_ll_alloc(pci);
1011 dev_err(pci->dev, "Couldn't allocate LLP memory\n");
1015 /* Don't fail if the DW eDMA driver can't find the device */
1016 ret = dw_edma_probe(&pci->edma);
1017 if (ret && ret != -ENODEV) {
1018 dev_err(pci->dev, "Couldn't register eDMA device\n");
1022 dev_info(pci->dev, "eDMA: unroll %s, %hu wr, %hu rd\n",
1023 pci->edma.mf == EDMA_MF_EDMA_UNROLL ? "T" : "F",
1024 pci->edma.ll_wr_cnt, pci->edma.ll_rd_cnt);
1029 void dw_pcie_edma_remove(struct dw_pcie *pci)
1031 dw_edma_remove(&pci->edma);
1034 void dw_pcie_setup(struct dw_pcie *pci)
1038 if (pci->link_gen > 0)
1039 dw_pcie_link_set_max_speed(pci, pci->link_gen);
1041 /* Configure Gen1 N_FTS */
1042 if (pci->n_fts[0]) {
1043 val = dw_pcie_readl_dbi(pci, PCIE_PORT_AFR);
1044 val &= ~(PORT_AFR_N_FTS_MASK | PORT_AFR_CC_N_FTS_MASK);
1045 val |= PORT_AFR_N_FTS(pci->n_fts[0]);
1046 val |= PORT_AFR_CC_N_FTS(pci->n_fts[0]);
1047 dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val);
1050 /* Configure Gen2+ N_FTS */
1051 if (pci->n_fts[1]) {
1052 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
1053 val &= ~PORT_LOGIC_N_FTS_MASK;
1054 val |= pci->n_fts[1];
1055 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
1058 if (dw_pcie_cap_is(pci, CDM_CHECK)) {
1059 val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
1060 val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS |
1061 PCIE_PL_CHK_REG_CHK_REG_START;
1062 dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val);
1065 val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
1066 val &= ~PORT_LINK_FAST_LINK_MODE;
1067 val |= PORT_LINK_DLL_LINK_EN;
1068 dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
1070 dw_pcie_link_set_max_link_width(pci, pci->num_lanes);