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/delay.h>
13 #include <linux/of_platform.h>
14 #include <linux/types.h>
16 #include "../../pci.h"
17 #include "pcie-designware.h"
20 * These interfaces resemble the pci_find_*capability() interfaces, but these
21 * are for configuring host controllers, which are bridges *to* PCI devices but
22 * are not PCI devices themselves.
24 static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr,
27 u8 cap_id, next_cap_ptr;
33 reg = dw_pcie_readw_dbi(pci, cap_ptr);
34 cap_id = (reg & 0x00ff);
36 if (cap_id > PCI_CAP_ID_MAX)
42 next_cap_ptr = (reg & 0xff00) >> 8;
43 return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
46 u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap)
51 reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST);
52 next_cap_ptr = (reg & 0x00ff);
54 return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap);
56 EXPORT_SYMBOL_GPL(dw_pcie_find_capability);
58 static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start,
63 int pos = PCI_CFG_SPACE_SIZE;
65 /* minimum 8 bytes per capability */
66 ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
71 header = dw_pcie_readl_dbi(pci, pos);
73 * If we have no capabilities, this is indicated by cap ID,
74 * cap version and next pointer all being 0.
80 if (PCI_EXT_CAP_ID(header) == cap && pos != start)
83 pos = PCI_EXT_CAP_NEXT(header);
84 if (pos < PCI_CFG_SPACE_SIZE)
87 header = dw_pcie_readl_dbi(pci, pos);
93 u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap)
95 return dw_pcie_find_next_ext_capability(pci, 0, cap);
97 EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability);
99 int dw_pcie_read(void __iomem *addr, int size, u32 *val)
101 if (!IS_ALIGNED((uintptr_t)addr, size)) {
103 return PCIBIOS_BAD_REGISTER_NUMBER;
108 } else if (size == 2) {
110 } else if (size == 1) {
114 return PCIBIOS_BAD_REGISTER_NUMBER;
117 return PCIBIOS_SUCCESSFUL;
119 EXPORT_SYMBOL_GPL(dw_pcie_read);
121 int dw_pcie_write(void __iomem *addr, int size, u32 val)
123 if (!IS_ALIGNED((uintptr_t)addr, size))
124 return PCIBIOS_BAD_REGISTER_NUMBER;
133 return PCIBIOS_BAD_REGISTER_NUMBER;
135 return PCIBIOS_SUCCESSFUL;
137 EXPORT_SYMBOL_GPL(dw_pcie_write);
139 u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
144 if (pci->ops->read_dbi)
145 return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);
147 ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
149 dev_err(pci->dev, "Read DBI address failed\n");
153 EXPORT_SYMBOL_GPL(dw_pcie_read_dbi);
155 void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
159 if (pci->ops->write_dbi) {
160 pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
164 ret = dw_pcie_write(pci->dbi_base + reg, size, val);
166 dev_err(pci->dev, "Write DBI address failed\n");
168 EXPORT_SYMBOL_GPL(dw_pcie_write_dbi);
170 void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
174 if (pci->ops->write_dbi2) {
175 pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val);
179 ret = dw_pcie_write(pci->dbi_base2 + reg, size, val);
181 dev_err(pci->dev, "write DBI address failed\n");
184 static u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 reg)
189 if (pci->ops->read_dbi)
190 return pci->ops->read_dbi(pci, pci->atu_base, reg, 4);
192 ret = dw_pcie_read(pci->atu_base + reg, 4, &val);
194 dev_err(pci->dev, "Read ATU address failed\n");
199 static void dw_pcie_writel_atu(struct dw_pcie *pci, u32 reg, u32 val)
203 if (pci->ops->write_dbi) {
204 pci->ops->write_dbi(pci, pci->atu_base, reg, 4, val);
208 ret = dw_pcie_write(pci->atu_base + reg, 4, val);
210 dev_err(pci->dev, "Write ATU address failed\n");
213 static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
215 u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
217 return dw_pcie_readl_atu(pci, offset + reg);
220 static void dw_pcie_writel_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg,
223 u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
225 dw_pcie_writel_atu(pci, offset + reg, val);
228 static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, u8 func_no,
230 u64 cpu_addr, u64 pci_addr,
234 u64 limit_addr = cpu_addr + size - 1;
236 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
237 lower_32_bits(cpu_addr));
238 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE,
239 upper_32_bits(cpu_addr));
240 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_LIMIT,
241 lower_32_bits(limit_addr));
242 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_LIMIT,
243 upper_32_bits(limit_addr));
244 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
245 lower_32_bits(pci_addr));
246 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
247 upper_32_bits(pci_addr));
248 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
249 type | PCIE_ATU_FUNC_NUM(func_no));
250 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
254 * Make sure ATU enable takes effect before any subsequent config
257 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
258 val = dw_pcie_readl_ob_unroll(pci, index,
259 PCIE_ATU_UNR_REGION_CTRL2);
260 if (val & PCIE_ATU_ENABLE)
263 mdelay(LINK_WAIT_IATU);
265 dev_err(pci->dev, "Outbound iATU is not being enabled\n");
268 static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
269 int index, int type, u64 cpu_addr,
270 u64 pci_addr, u32 size)
274 if (pci->ops->cpu_addr_fixup)
275 cpu_addr = pci->ops->cpu_addr_fixup(pci, cpu_addr);
277 if (pci->iatu_unroll_enabled) {
278 dw_pcie_prog_outbound_atu_unroll(pci, func_no, index, type,
279 cpu_addr, pci_addr, size);
283 dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT,
284 PCIE_ATU_REGION_OUTBOUND | index);
285 dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_BASE,
286 lower_32_bits(cpu_addr));
287 dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_BASE,
288 upper_32_bits(cpu_addr));
289 dw_pcie_writel_dbi(pci, PCIE_ATU_LIMIT,
290 lower_32_bits(cpu_addr + size - 1));
291 dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET,
292 lower_32_bits(pci_addr));
293 dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET,
294 upper_32_bits(pci_addr));
295 dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type |
296 PCIE_ATU_FUNC_NUM(func_no));
297 dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE);
300 * Make sure ATU enable takes effect before any subsequent config
303 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
304 val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
305 if (val & PCIE_ATU_ENABLE)
308 mdelay(LINK_WAIT_IATU);
310 dev_err(pci->dev, "Outbound iATU is not being enabled\n");
313 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
314 u64 cpu_addr, u64 pci_addr, u32 size)
316 __dw_pcie_prog_outbound_atu(pci, 0, index, type,
317 cpu_addr, pci_addr, size);
320 void dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
321 int type, u64 cpu_addr, u64 pci_addr,
324 __dw_pcie_prog_outbound_atu(pci, func_no, index, type,
325 cpu_addr, pci_addr, size);
328 static u32 dw_pcie_readl_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg)
330 u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index);
332 return dw_pcie_readl_atu(pci, offset + reg);
335 static void dw_pcie_writel_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg,
338 u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index);
340 dw_pcie_writel_atu(pci, offset + reg, val);
343 static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, u8 func_no,
344 int index, int bar, u64 cpu_addr,
345 enum dw_pcie_as_type as_type)
350 dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
351 lower_32_bits(cpu_addr));
352 dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
353 upper_32_bits(cpu_addr));
357 type = PCIE_ATU_TYPE_MEM;
360 type = PCIE_ATU_TYPE_IO;
366 dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, type |
367 PCIE_ATU_FUNC_NUM(func_no));
368 dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
369 PCIE_ATU_FUNC_NUM_MATCH_EN |
371 PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
374 * Make sure ATU enable takes effect before any subsequent config
377 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
378 val = dw_pcie_readl_ib_unroll(pci, index,
379 PCIE_ATU_UNR_REGION_CTRL2);
380 if (val & PCIE_ATU_ENABLE)
383 mdelay(LINK_WAIT_IATU);
385 dev_err(pci->dev, "Inbound iATU is not being enabled\n");
390 int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
391 int bar, u64 cpu_addr,
392 enum dw_pcie_as_type as_type)
397 if (pci->iatu_unroll_enabled)
398 return dw_pcie_prog_inbound_atu_unroll(pci, func_no, index, bar,
401 dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, PCIE_ATU_REGION_INBOUND |
403 dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, lower_32_bits(cpu_addr));
404 dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET, upper_32_bits(cpu_addr));
408 type = PCIE_ATU_TYPE_MEM;
411 type = PCIE_ATU_TYPE_IO;
417 dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type |
418 PCIE_ATU_FUNC_NUM(func_no));
419 dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE |
420 PCIE_ATU_FUNC_NUM_MATCH_EN |
421 PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
424 * Make sure ATU enable takes effect before any subsequent config
427 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
428 val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
429 if (val & PCIE_ATU_ENABLE)
432 mdelay(LINK_WAIT_IATU);
434 dev_err(pci->dev, "Inbound iATU is not being enabled\n");
439 void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
440 enum dw_pcie_region_type type)
445 case DW_PCIE_REGION_INBOUND:
446 region = PCIE_ATU_REGION_INBOUND;
448 case DW_PCIE_REGION_OUTBOUND:
449 region = PCIE_ATU_REGION_OUTBOUND;
455 if (pci->iatu_unroll_enabled) {
456 if (region == PCIE_ATU_REGION_INBOUND) {
457 dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
458 ~(u32)PCIE_ATU_ENABLE);
460 dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
461 ~(u32)PCIE_ATU_ENABLE);
464 dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region | index);
465 dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, ~(u32)PCIE_ATU_ENABLE);
469 int dw_pcie_wait_for_link(struct dw_pcie *pci)
473 /* Check if the link is up or not */
474 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
475 if (dw_pcie_link_up(pci)) {
476 dev_info(pci->dev, "Link up\n");
479 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
482 dev_info(pci->dev, "Phy link never came up\n");
486 EXPORT_SYMBOL_GPL(dw_pcie_wait_for_link);
488 int dw_pcie_link_up(struct dw_pcie *pci)
492 if (pci->ops->link_up)
493 return pci->ops->link_up(pci);
495 val = readl(pci->dbi_base + PCIE_PORT_DEBUG1);
496 return ((val & PCIE_PORT_DEBUG1_LINK_UP) &&
497 (!(val & PCIE_PORT_DEBUG1_LINK_IN_TRAINING)));
500 void dw_pcie_upconfig_setup(struct dw_pcie *pci)
504 val = dw_pcie_readl_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL);
505 val |= PORT_MLTI_UPCFG_SUPPORT;
506 dw_pcie_writel_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL, val);
508 EXPORT_SYMBOL_GPL(dw_pcie_upconfig_setup);
510 static void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen)
512 u32 cap, ctrl2, link_speed;
513 u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
515 cap = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
516 ctrl2 = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCTL2);
517 ctrl2 &= ~PCI_EXP_LNKCTL2_TLS;
519 switch (pcie_link_speed[link_gen]) {
520 case PCIE_SPEED_2_5GT:
521 link_speed = PCI_EXP_LNKCTL2_TLS_2_5GT;
523 case PCIE_SPEED_5_0GT:
524 link_speed = PCI_EXP_LNKCTL2_TLS_5_0GT;
526 case PCIE_SPEED_8_0GT:
527 link_speed = PCI_EXP_LNKCTL2_TLS_8_0GT;
529 case PCIE_SPEED_16_0GT:
530 link_speed = PCI_EXP_LNKCTL2_TLS_16_0GT;
533 /* Use hardware capability */
534 link_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, cap);
535 ctrl2 &= ~PCI_EXP_LNKCTL2_HASD;
539 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCTL2, ctrl2 | link_speed);
541 cap &= ~((u32)PCI_EXP_LNKCAP_SLS);
542 dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCAP, cap | link_speed);
546 static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
550 val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
551 if (val == 0xffffffff)
557 void dw_pcie_setup(struct dw_pcie *pci)
560 struct device *dev = pci->dev;
561 struct device_node *np = dev->of_node;
562 struct platform_device *pdev = to_platform_device(dev);
564 if (pci->version >= 0x480A || (!pci->version &&
565 dw_pcie_iatu_unroll_enabled(pci))) {
566 pci->iatu_unroll_enabled = true;
569 devm_platform_ioremap_resource_byname(pdev, "atu");
570 if (IS_ERR(pci->atu_base))
571 pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
573 dev_dbg(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ?
574 "enabled" : "disabled");
576 if (pci->link_gen > 0)
577 dw_pcie_link_set_max_speed(pci, pci->link_gen);
579 /* Configure Gen1 N_FTS */
581 val = dw_pcie_readl_dbi(pci, PCIE_PORT_AFR);
582 val &= ~(PORT_AFR_N_FTS_MASK | PORT_AFR_CC_N_FTS_MASK);
583 val |= PORT_AFR_N_FTS(pci->n_fts[0]);
584 val |= PORT_AFR_CC_N_FTS(pci->n_fts[0]);
585 dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val);
588 /* Configure Gen2+ N_FTS */
590 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
591 val &= ~PORT_LOGIC_N_FTS_MASK;
592 val |= pci->n_fts[pci->link_gen - 1];
593 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
596 val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
597 val &= ~PORT_LINK_FAST_LINK_MODE;
598 val |= PORT_LINK_DLL_LINK_EN;
599 dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
601 if (of_property_read_bool(np, "snps,enable-cdm-check")) {
602 val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
603 val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS |
604 PCIE_PL_CHK_REG_CHK_REG_START;
605 dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val);
608 of_property_read_u32(np, "num-lanes", &pci->num_lanes);
609 if (!pci->num_lanes) {
610 dev_dbg(pci->dev, "Using h/w default number of lanes\n");
614 /* Set the number of lanes */
615 val &= ~PORT_LINK_FAST_LINK_MODE;
616 val &= ~PORT_LINK_MODE_MASK;
617 switch (pci->num_lanes) {
619 val |= PORT_LINK_MODE_1_LANES;
622 val |= PORT_LINK_MODE_2_LANES;
625 val |= PORT_LINK_MODE_4_LANES;
628 val |= PORT_LINK_MODE_8_LANES;
631 dev_err(pci->dev, "num-lanes %u: invalid value\n", pci->num_lanes);
634 dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
636 /* Set link width speed control register */
637 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
638 val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
639 switch (pci->num_lanes) {
641 val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
644 val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
647 val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
650 val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
653 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);