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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Rockchip AXI PCIe host controller driver
4 *
5 * Copyright (c) 2016 Rockchip, Inc.
6 *
7 * Author: Shawn Lin <shawn.lin@rock-chips.com>
8 * Wenrui Li <wenrui.li@rock-chips.com>
9 *
10 * Bits taken from Synopsys DesignWare Host controller driver and
11 * ARM PCI Host generic driver.
12 */
13
14#include <linux/bitrev.h>
15#include <linux/clk.h>
16#include <linux/delay.h>
17#include <linux/gpio/consumer.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/iopoll.h>
21#include <linux/irq.h>
22#include <linux/irqchip/chained_irq.h>
23#include <linux/irqdomain.h>
24#include <linux/kernel.h>
25#include <linux/mfd/syscon.h>
26#include <linux/module.h>
27#include <linux/of_address.h>
28#include <linux/of_device.h>
29#include <linux/of_pci.h>
30#include <linux/of_platform.h>
31#include <linux/of_irq.h>
32#include <linux/pci.h>
33#include <linux/pci_ids.h>
34#include <linux/phy/phy.h>
35#include <linux/platform_device.h>
36#include <linux/reset.h>
37#include <linux/regmap.h>
38
39#include "../pci.h"
40#include "pcie-rockchip.h"
41
42static void rockchip_pcie_enable_bw_int(struct rockchip_pcie *rockchip)
43{
44 u32 status;
45
46 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
47 status |= (PCI_EXP_LNKCTL_LBMIE | PCI_EXP_LNKCTL_LABIE);
48 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
49}
50
51static void rockchip_pcie_clr_bw_int(struct rockchip_pcie *rockchip)
52{
53 u32 status;
54
55 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
56 status |= (PCI_EXP_LNKSTA_LBMS | PCI_EXP_LNKSTA_LABS) << 16;
57 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
58}
59
60static void rockchip_pcie_update_txcredit_mui(struct rockchip_pcie *rockchip)
61{
62 u32 val;
63
64 /* Update Tx credit maximum update interval */
65 val = rockchip_pcie_read(rockchip, PCIE_CORE_TXCREDIT_CFG1);
66 val &= ~PCIE_CORE_TXCREDIT_CFG1_MUI_MASK;
67 val |= PCIE_CORE_TXCREDIT_CFG1_MUI_ENCODE(24000); /* ns */
68 rockchip_pcie_write(rockchip, val, PCIE_CORE_TXCREDIT_CFG1);
69}
70
71static int rockchip_pcie_valid_device(struct rockchip_pcie *rockchip,
72 struct pci_bus *bus, int dev)
73{
74 /*
75 * Access only one slot on each root port.
76 * Do not read more than one device on the bus directly attached
77 * to RC's downstream side.
78 */
79 if (pci_is_root_bus(bus) || pci_is_root_bus(bus->parent))
80 return dev == 0;
81
82 return 1;
83}
84
85static u8 rockchip_pcie_lane_map(struct rockchip_pcie *rockchip)
86{
87 u32 val;
88 u8 map;
89
90 if (rockchip->legacy_phy)
91 return GENMASK(MAX_LANE_NUM - 1, 0);
92
93 val = rockchip_pcie_read(rockchip, PCIE_CORE_LANE_MAP);
94 map = val & PCIE_CORE_LANE_MAP_MASK;
95
96 /* The link may be using a reverse-indexed mapping. */
97 if (val & PCIE_CORE_LANE_MAP_REVERSE)
98 map = bitrev8(map) >> 4;
99
100 return map;
101}
102
103static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip,
104 int where, int size, u32 *val)
105{
106 void __iomem *addr;
107
108 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + where;
109
110 if (!IS_ALIGNED((uintptr_t)addr, size)) {
111 *val = 0;
112 return PCIBIOS_BAD_REGISTER_NUMBER;
113 }
114
115 if (size == 4) {
116 *val = readl(addr);
117 } else if (size == 2) {
118 *val = readw(addr);
119 } else if (size == 1) {
120 *val = readb(addr);
121 } else {
122 *val = 0;
123 return PCIBIOS_BAD_REGISTER_NUMBER;
124 }
125 return PCIBIOS_SUCCESSFUL;
126}
127
128static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip,
129 int where, int size, u32 val)
130{
131 u32 mask, tmp, offset;
132 void __iomem *addr;
133
134 offset = where & ~0x3;
135 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + offset;
136
137 if (size == 4) {
138 writel(val, addr);
139 return PCIBIOS_SUCCESSFUL;
140 }
141
142 mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));
143
144 /*
145 * N.B. This read/modify/write isn't safe in general because it can
146 * corrupt RW1C bits in adjacent registers. But the hardware
147 * doesn't support smaller writes.
148 */
149 tmp = readl(addr) & mask;
150 tmp |= val << ((where & 0x3) * 8);
151 writel(tmp, addr);
152
153 return PCIBIOS_SUCCESSFUL;
154}
155
156static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip,
157 struct pci_bus *bus, u32 devfn,
158 int where, int size, u32 *val)
159{
160 u32 busdev;
161
162 busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
163 PCI_FUNC(devfn), where);
164
165 if (!IS_ALIGNED(busdev, size)) {
166 *val = 0;
167 return PCIBIOS_BAD_REGISTER_NUMBER;
168 }
169
170 if (pci_is_root_bus(bus->parent))
171 rockchip_pcie_cfg_configuration_accesses(rockchip,
172 AXI_WRAPPER_TYPE0_CFG);
173 else
174 rockchip_pcie_cfg_configuration_accesses(rockchip,
175 AXI_WRAPPER_TYPE1_CFG);
176
177 if (size == 4) {
178 *val = readl(rockchip->reg_base + busdev);
179 } else if (size == 2) {
180 *val = readw(rockchip->reg_base + busdev);
181 } else if (size == 1) {
182 *val = readb(rockchip->reg_base + busdev);
183 } else {
184 *val = 0;
185 return PCIBIOS_BAD_REGISTER_NUMBER;
186 }
187 return PCIBIOS_SUCCESSFUL;
188}
189
190static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip,
191 struct pci_bus *bus, u32 devfn,
192 int where, int size, u32 val)
193{
194 u32 busdev;
195
196 busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
197 PCI_FUNC(devfn), where);
198 if (!IS_ALIGNED(busdev, size))
199 return PCIBIOS_BAD_REGISTER_NUMBER;
200
201 if (pci_is_root_bus(bus->parent))
202 rockchip_pcie_cfg_configuration_accesses(rockchip,
203 AXI_WRAPPER_TYPE0_CFG);
204 else
205 rockchip_pcie_cfg_configuration_accesses(rockchip,
206 AXI_WRAPPER_TYPE1_CFG);
207
208 if (size == 4)
209 writel(val, rockchip->reg_base + busdev);
210 else if (size == 2)
211 writew(val, rockchip->reg_base + busdev);
212 else if (size == 1)
213 writeb(val, rockchip->reg_base + busdev);
214 else
215 return PCIBIOS_BAD_REGISTER_NUMBER;
216
217 return PCIBIOS_SUCCESSFUL;
218}
219
220static int rockchip_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
221 int size, u32 *val)
222{
223 struct rockchip_pcie *rockchip = bus->sysdata;
224
225 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn))) {
226 *val = 0xffffffff;
227 return PCIBIOS_DEVICE_NOT_FOUND;
228 }
229
230 if (pci_is_root_bus(bus))
231 return rockchip_pcie_rd_own_conf(rockchip, where, size, val);
232
233 return rockchip_pcie_rd_other_conf(rockchip, bus, devfn, where, size,
234 val);
235}
236
237static int rockchip_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
238 int where, int size, u32 val)
239{
240 struct rockchip_pcie *rockchip = bus->sysdata;
241
242 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn)))
243 return PCIBIOS_DEVICE_NOT_FOUND;
244
245 if (pci_is_root_bus(bus))
246 return rockchip_pcie_wr_own_conf(rockchip, where, size, val);
247
248 return rockchip_pcie_wr_other_conf(rockchip, bus, devfn, where, size,
249 val);
250}
251
252static struct pci_ops rockchip_pcie_ops = {
253 .read = rockchip_pcie_rd_conf,
254 .write = rockchip_pcie_wr_conf,
255};
256
257static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
258{
259 int curr;
260 u32 status, scale, power;
261
262 if (IS_ERR(rockchip->vpcie3v3))
263 return;
264
265 /*
266 * Set RC's captured slot power limit and scale if
267 * vpcie3v3 available. The default values are both zero
268 * which means the software should set these two according
269 * to the actual power supply.
270 */
271 curr = regulator_get_current_limit(rockchip->vpcie3v3);
272 if (curr <= 0)
273 return;
274
275 scale = 3; /* 0.001x */
276 curr = curr / 1000; /* convert to mA */
277 power = (curr * 3300) / 1000; /* milliwatt */
278 while (power > PCIE_RC_CONFIG_DCR_CSPL_LIMIT) {
279 if (!scale) {
280 dev_warn(rockchip->dev, "invalid power supply\n");
281 return;
282 }
283 scale--;
284 power = power / 10;
285 }
286
287 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCR);
288 status |= (power << PCIE_RC_CONFIG_DCR_CSPL_SHIFT) |
289 (scale << PCIE_RC_CONFIG_DCR_CPLS_SHIFT);
290 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR);
291}
292
293/**
294 * rockchip_pcie_host_init_port - Initialize hardware
295 * @rockchip: PCIe port information
296 */
297static int rockchip_pcie_host_init_port(struct rockchip_pcie *rockchip)
298{
299 struct device *dev = rockchip->dev;
300 int err, i = MAX_LANE_NUM;
301 u32 status;
302
303 gpiod_set_value_cansleep(rockchip->ep_gpio, 0);
304
305 err = rockchip_pcie_init_port(rockchip);
306 if (err)
307 return err;
308
309 /* Fix the transmitted FTS count desired to exit from L0s. */
310 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1);
311 status = (status & ~PCIE_CORE_CTRL_PLC1_FTS_MASK) |
312 (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT);
313 rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1);
314
315 rockchip_pcie_set_power_limit(rockchip);
316
317 /* Set RC's clock architecture as common clock */
318 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
319 status |= PCI_EXP_LNKSTA_SLC << 16;
320 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
321
322 /* Set RC's RCB to 128 */
323 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
324 status |= PCI_EXP_LNKCTL_RCB;
325 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
326
327 /* Enable Gen1 training */
328 rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE,
329 PCIE_CLIENT_CONFIG);
330
331 gpiod_set_value_cansleep(rockchip->ep_gpio, 1);
332
333 /* 500ms timeout value should be enough for Gen1/2 training */
334 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_BASIC_STATUS1,
335 status, PCIE_LINK_UP(status), 20,
336 500 * USEC_PER_MSEC);
337 if (err) {
338 dev_err(dev, "PCIe link training gen1 timeout!\n");
339 goto err_power_off_phy;
340 }
341
342 if (rockchip->link_gen == 2) {
343 /*
344 * Enable retrain for gen2. This should be configured only after
345 * gen1 finished.
346 */
347 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
348 status |= PCI_EXP_LNKCTL_RL;
349 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
350
351 err = readl_poll_timeout(rockchip->apb_base + PCIE_CORE_CTRL,
352 status, PCIE_LINK_IS_GEN2(status), 20,
353 500 * USEC_PER_MSEC);
354 if (err)
355 dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n");
356 }
357
358 /* Check the final link width from negotiated lane counter from MGMT */
359 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL);
360 status = 0x1 << ((status & PCIE_CORE_PL_CONF_LANE_MASK) >>
361 PCIE_CORE_PL_CONF_LANE_SHIFT);
362 dev_dbg(dev, "current link width is x%d\n", status);
363
364 /* Power off unused lane(s) */
365 rockchip->lanes_map = rockchip_pcie_lane_map(rockchip);
366 for (i = 0; i < MAX_LANE_NUM; i++) {
367 if (!(rockchip->lanes_map & BIT(i))) {
368 dev_dbg(dev, "idling lane %d\n", i);
369 phy_power_off(rockchip->phys[i]);
370 }
371 }
372
373 rockchip_pcie_write(rockchip, ROCKCHIP_VENDOR_ID,
374 PCIE_CORE_CONFIG_VENDOR);
375 rockchip_pcie_write(rockchip,
376 PCI_CLASS_BRIDGE_PCI << PCIE_RC_CONFIG_SCC_SHIFT,
377 PCIE_RC_CONFIG_RID_CCR);
378
379 /* Clear THP cap's next cap pointer to remove L1 substate cap */
380 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_THP_CAP);
381 status &= ~PCIE_RC_CONFIG_THP_CAP_NEXT_MASK;
382 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_THP_CAP);
383
384 /* Clear L0s from RC's link cap */
385 if (of_property_read_bool(dev->of_node, "aspm-no-l0s")) {
386 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LINK_CAP);
387 status &= ~PCIE_RC_CONFIG_LINK_CAP_L0S;
388 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LINK_CAP);
389 }
390
391 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCSR);
392 status &= ~PCIE_RC_CONFIG_DCSR_MPS_MASK;
393 status |= PCIE_RC_CONFIG_DCSR_MPS_256;
394 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCSR);
395
396 return 0;
397err_power_off_phy:
398 while (i--)
399 phy_power_off(rockchip->phys[i]);
400 i = MAX_LANE_NUM;
401 while (i--)
402 phy_exit(rockchip->phys[i]);
403 return err;
404}
405
406static irqreturn_t rockchip_pcie_subsys_irq_handler(int irq, void *arg)
407{
408 struct rockchip_pcie *rockchip = arg;
409 struct device *dev = rockchip->dev;
410 u32 reg;
411 u32 sub_reg;
412
413 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
414 if (reg & PCIE_CLIENT_INT_LOCAL) {
415 dev_dbg(dev, "local interrupt received\n");
416 sub_reg = rockchip_pcie_read(rockchip, PCIE_CORE_INT_STATUS);
417 if (sub_reg & PCIE_CORE_INT_PRFPE)
418 dev_dbg(dev, "parity error detected while reading from the PNP receive FIFO RAM\n");
419
420 if (sub_reg & PCIE_CORE_INT_CRFPE)
421 dev_dbg(dev, "parity error detected while reading from the Completion Receive FIFO RAM\n");
422
423 if (sub_reg & PCIE_CORE_INT_RRPE)
424 dev_dbg(dev, "parity error detected while reading from replay buffer RAM\n");
425
426 if (sub_reg & PCIE_CORE_INT_PRFO)
427 dev_dbg(dev, "overflow occurred in the PNP receive FIFO\n");
428
429 if (sub_reg & PCIE_CORE_INT_CRFO)
430 dev_dbg(dev, "overflow occurred in the completion receive FIFO\n");
431
432 if (sub_reg & PCIE_CORE_INT_RT)
433 dev_dbg(dev, "replay timer timed out\n");
434
435 if (sub_reg & PCIE_CORE_INT_RTR)
436 dev_dbg(dev, "replay timer rolled over after 4 transmissions of the same TLP\n");
437
438 if (sub_reg & PCIE_CORE_INT_PE)
439 dev_dbg(dev, "phy error detected on receive side\n");
440
441 if (sub_reg & PCIE_CORE_INT_MTR)
442 dev_dbg(dev, "malformed TLP received from the link\n");
443
444 if (sub_reg & PCIE_CORE_INT_UCR)
445 dev_dbg(dev, "malformed TLP received from the link\n");
446
447 if (sub_reg & PCIE_CORE_INT_FCE)
448 dev_dbg(dev, "an error was observed in the flow control advertisements from the other side\n");
449
450 if (sub_reg & PCIE_CORE_INT_CT)
451 dev_dbg(dev, "a request timed out waiting for completion\n");
452
453 if (sub_reg & PCIE_CORE_INT_UTC)
454 dev_dbg(dev, "unmapped TC error\n");
455
456 if (sub_reg & PCIE_CORE_INT_MMVC)
457 dev_dbg(dev, "MSI mask register changes\n");
458
459 rockchip_pcie_write(rockchip, sub_reg, PCIE_CORE_INT_STATUS);
460 } else if (reg & PCIE_CLIENT_INT_PHY) {
461 dev_dbg(dev, "phy link changes\n");
462 rockchip_pcie_update_txcredit_mui(rockchip);
463 rockchip_pcie_clr_bw_int(rockchip);
464 }
465
466 rockchip_pcie_write(rockchip, reg & PCIE_CLIENT_INT_LOCAL,
467 PCIE_CLIENT_INT_STATUS);
468
469 return IRQ_HANDLED;
470}
471
472static irqreturn_t rockchip_pcie_client_irq_handler(int irq, void *arg)
473{
474 struct rockchip_pcie *rockchip = arg;
475 struct device *dev = rockchip->dev;
476 u32 reg;
477
478 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
479 if (reg & PCIE_CLIENT_INT_LEGACY_DONE)
480 dev_dbg(dev, "legacy done interrupt received\n");
481
482 if (reg & PCIE_CLIENT_INT_MSG)
483 dev_dbg(dev, "message done interrupt received\n");
484
485 if (reg & PCIE_CLIENT_INT_HOT_RST)
486 dev_dbg(dev, "hot reset interrupt received\n");
487
488 if (reg & PCIE_CLIENT_INT_DPA)
489 dev_dbg(dev, "dpa interrupt received\n");
490
491 if (reg & PCIE_CLIENT_INT_FATAL_ERR)
492 dev_dbg(dev, "fatal error interrupt received\n");
493
494 if (reg & PCIE_CLIENT_INT_NFATAL_ERR)
495 dev_dbg(dev, "no fatal error interrupt received\n");
496
497 if (reg & PCIE_CLIENT_INT_CORR_ERR)
498 dev_dbg(dev, "correctable error interrupt received\n");
499
500 if (reg & PCIE_CLIENT_INT_PHY)
501 dev_dbg(dev, "phy interrupt received\n");
502
503 rockchip_pcie_write(rockchip, reg & (PCIE_CLIENT_INT_LEGACY_DONE |
504 PCIE_CLIENT_INT_MSG | PCIE_CLIENT_INT_HOT_RST |
505 PCIE_CLIENT_INT_DPA | PCIE_CLIENT_INT_FATAL_ERR |
506 PCIE_CLIENT_INT_NFATAL_ERR |
507 PCIE_CLIENT_INT_CORR_ERR |
508 PCIE_CLIENT_INT_PHY),
509 PCIE_CLIENT_INT_STATUS);
510
511 return IRQ_HANDLED;
512}
513
514static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
515{
516 struct irq_chip *chip = irq_desc_get_chip(desc);
517 struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc);
518 struct device *dev = rockchip->dev;
519 u32 reg;
520 u32 hwirq;
521 u32 virq;
522
523 chained_irq_enter(chip, desc);
524
525 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
526 reg = (reg & PCIE_CLIENT_INTR_MASK) >> PCIE_CLIENT_INTR_SHIFT;
527
528 while (reg) {
529 hwirq = ffs(reg) - 1;
530 reg &= ~BIT(hwirq);
531
532 virq = irq_find_mapping(rockchip->irq_domain, hwirq);
533 if (virq)
534 generic_handle_irq(virq);
535 else
536 dev_err(dev, "unexpected IRQ, INT%d\n", hwirq);
537 }
538
539 chained_irq_exit(chip, desc);
540}
541
542static int rockchip_pcie_setup_irq(struct rockchip_pcie *rockchip)
543{
544 int irq, err;
545 struct device *dev = rockchip->dev;
546 struct platform_device *pdev = to_platform_device(dev);
547
548 irq = platform_get_irq_byname(pdev, "sys");
549 if (irq < 0)
550 return irq;
551
552 err = devm_request_irq(dev, irq, rockchip_pcie_subsys_irq_handler,
553 IRQF_SHARED, "pcie-sys", rockchip);
554 if (err) {
555 dev_err(dev, "failed to request PCIe subsystem IRQ\n");
556 return err;
557 }
558
559 irq = platform_get_irq_byname(pdev, "legacy");
560 if (irq < 0)
561 return irq;
562
563 irq_set_chained_handler_and_data(irq,
564 rockchip_pcie_legacy_int_handler,
565 rockchip);
566
567 irq = platform_get_irq_byname(pdev, "client");
568 if (irq < 0)
569 return irq;
570
571 err = devm_request_irq(dev, irq, rockchip_pcie_client_irq_handler,
572 IRQF_SHARED, "pcie-client", rockchip);
573 if (err) {
574 dev_err(dev, "failed to request PCIe client IRQ\n");
575 return err;
576 }
577
578 return 0;
579}
580
581/**
582 * rockchip_pcie_parse_host_dt - Parse Device Tree
583 * @rockchip: PCIe port information
584 *
585 * Return: '0' on success and error value on failure
586 */
587static int rockchip_pcie_parse_host_dt(struct rockchip_pcie *rockchip)
588{
589 struct device *dev = rockchip->dev;
590 int err;
591
592 err = rockchip_pcie_parse_dt(rockchip);
593 if (err)
594 return err;
595
596 err = rockchip_pcie_setup_irq(rockchip);
597 if (err)
598 return err;
599
600 rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v");
601 if (IS_ERR(rockchip->vpcie12v)) {
602 if (PTR_ERR(rockchip->vpcie12v) != -ENODEV)
603 return PTR_ERR(rockchip->vpcie12v);
604 dev_info(dev, "no vpcie12v regulator found\n");
605 }
606
607 rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
608 if (IS_ERR(rockchip->vpcie3v3)) {
609 if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
610 return PTR_ERR(rockchip->vpcie3v3);
611 dev_info(dev, "no vpcie3v3 regulator found\n");
612 }
613
614 rockchip->vpcie1v8 = devm_regulator_get(dev, "vpcie1v8");
615 if (IS_ERR(rockchip->vpcie1v8))
616 return PTR_ERR(rockchip->vpcie1v8);
617
618 rockchip->vpcie0v9 = devm_regulator_get(dev, "vpcie0v9");
619 if (IS_ERR(rockchip->vpcie0v9))
620 return PTR_ERR(rockchip->vpcie0v9);
621
622 return 0;
623}
624
625static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
626{
627 struct device *dev = rockchip->dev;
628 int err;
629
630 if (!IS_ERR(rockchip->vpcie12v)) {
631 err = regulator_enable(rockchip->vpcie12v);
632 if (err) {
633 dev_err(dev, "fail to enable vpcie12v regulator\n");
634 goto err_out;
635 }
636 }
637
638 if (!IS_ERR(rockchip->vpcie3v3)) {
639 err = regulator_enable(rockchip->vpcie3v3);
640 if (err) {
641 dev_err(dev, "fail to enable vpcie3v3 regulator\n");
642 goto err_disable_12v;
643 }
644 }
645
646 err = regulator_enable(rockchip->vpcie1v8);
647 if (err) {
648 dev_err(dev, "fail to enable vpcie1v8 regulator\n");
649 goto err_disable_3v3;
650 }
651
652 err = regulator_enable(rockchip->vpcie0v9);
653 if (err) {
654 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
655 goto err_disable_1v8;
656 }
657
658 return 0;
659
660err_disable_1v8:
661 regulator_disable(rockchip->vpcie1v8);
662err_disable_3v3:
663 if (!IS_ERR(rockchip->vpcie3v3))
664 regulator_disable(rockchip->vpcie3v3);
665err_disable_12v:
666 if (!IS_ERR(rockchip->vpcie12v))
667 regulator_disable(rockchip->vpcie12v);
668err_out:
669 return err;
670}
671
672static void rockchip_pcie_enable_interrupts(struct rockchip_pcie *rockchip)
673{
674 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) &
675 (~PCIE_CLIENT_INT_CLI), PCIE_CLIENT_INT_MASK);
676 rockchip_pcie_write(rockchip, (u32)(~PCIE_CORE_INT),
677 PCIE_CORE_INT_MASK);
678
679 rockchip_pcie_enable_bw_int(rockchip);
680}
681
682static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
683 irq_hw_number_t hwirq)
684{
685 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
686 irq_set_chip_data(irq, domain->host_data);
687
688 return 0;
689}
690
691static const struct irq_domain_ops intx_domain_ops = {
692 .map = rockchip_pcie_intx_map,
693};
694
695static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
696{
697 struct device *dev = rockchip->dev;
698 struct device_node *intc = of_get_next_child(dev->of_node, NULL);
699
700 if (!intc) {
701 dev_err(dev, "missing child interrupt-controller node\n");
702 return -EINVAL;
703 }
704
705 rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
706 &intx_domain_ops, rockchip);
707 of_node_put(intc);
708 if (!rockchip->irq_domain) {
709 dev_err(dev, "failed to get a INTx IRQ domain\n");
710 return -EINVAL;
711 }
712
713 return 0;
714}
715
716static int rockchip_pcie_prog_ob_atu(struct rockchip_pcie *rockchip,
717 int region_no, int type, u8 num_pass_bits,
718 u32 lower_addr, u32 upper_addr)
719{
720 u32 ob_addr_0;
721 u32 ob_addr_1;
722 u32 ob_desc_0;
723 u32 aw_offset;
724
725 if (region_no >= MAX_AXI_WRAPPER_REGION_NUM)
726 return -EINVAL;
727 if (num_pass_bits + 1 < 8)
728 return -EINVAL;
729 if (num_pass_bits > 63)
730 return -EINVAL;
731 if (region_no == 0) {
732 if (AXI_REGION_0_SIZE < (2ULL << num_pass_bits))
733 return -EINVAL;
734 }
735 if (region_no != 0) {
736 if (AXI_REGION_SIZE < (2ULL << num_pass_bits))
737 return -EINVAL;
738 }
739
740 aw_offset = (region_no << OB_REG_SIZE_SHIFT);
741
742 ob_addr_0 = num_pass_bits & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS;
743 ob_addr_0 |= lower_addr & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR;
744 ob_addr_1 = upper_addr;
745 ob_desc_0 = (1 << 23 | type);
746
747 rockchip_pcie_write(rockchip, ob_addr_0,
748 PCIE_CORE_OB_REGION_ADDR0 + aw_offset);
749 rockchip_pcie_write(rockchip, ob_addr_1,
750 PCIE_CORE_OB_REGION_ADDR1 + aw_offset);
751 rockchip_pcie_write(rockchip, ob_desc_0,
752 PCIE_CORE_OB_REGION_DESC0 + aw_offset);
753 rockchip_pcie_write(rockchip, 0,
754 PCIE_CORE_OB_REGION_DESC1 + aw_offset);
755
756 return 0;
757}
758
759static int rockchip_pcie_prog_ib_atu(struct rockchip_pcie *rockchip,
760 int region_no, u8 num_pass_bits,
761 u32 lower_addr, u32 upper_addr)
762{
763 u32 ib_addr_0;
764 u32 ib_addr_1;
765 u32 aw_offset;
766
767 if (region_no > MAX_AXI_IB_ROOTPORT_REGION_NUM)
768 return -EINVAL;
769 if (num_pass_bits + 1 < MIN_AXI_ADDR_BITS_PASSED)
770 return -EINVAL;
771 if (num_pass_bits > 63)
772 return -EINVAL;
773
774 aw_offset = (region_no << IB_ROOT_PORT_REG_SIZE_SHIFT);
775
776 ib_addr_0 = num_pass_bits & PCIE_CORE_IB_REGION_ADDR0_NUM_BITS;
777 ib_addr_0 |= (lower_addr << 8) & PCIE_CORE_IB_REGION_ADDR0_LO_ADDR;
778 ib_addr_1 = upper_addr;
779
780 rockchip_pcie_write(rockchip, ib_addr_0, PCIE_RP_IB_ADDR0 + aw_offset);
781 rockchip_pcie_write(rockchip, ib_addr_1, PCIE_RP_IB_ADDR1 + aw_offset);
782
783 return 0;
784}
785
786static int rockchip_pcie_cfg_atu(struct rockchip_pcie *rockchip)
787{
788 struct device *dev = rockchip->dev;
789 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rockchip);
790 struct resource_entry *entry;
791 u64 pci_addr, size;
792 int offset;
793 int err;
794 int reg_no;
795
796 rockchip_pcie_cfg_configuration_accesses(rockchip,
797 AXI_WRAPPER_TYPE0_CFG);
798 entry = resource_list_first_type(&bridge->windows, IORESOURCE_MEM);
799 if (!entry)
800 return -ENODEV;
801
802 size = resource_size(entry->res);
803 pci_addr = entry->res->start - entry->offset;
804 rockchip->msg_bus_addr = pci_addr;
805
806 for (reg_no = 0; reg_no < (size >> 20); reg_no++) {
807 err = rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1,
808 AXI_WRAPPER_MEM_WRITE,
809 20 - 1,
810 pci_addr + (reg_no << 20),
811 0);
812 if (err) {
813 dev_err(dev, "program RC mem outbound ATU failed\n");
814 return err;
815 }
816 }
817
818 err = rockchip_pcie_prog_ib_atu(rockchip, 2, 32 - 1, 0x0, 0);
819 if (err) {
820 dev_err(dev, "program RC mem inbound ATU failed\n");
821 return err;
822 }
823
824 entry = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
825 if (!entry)
826 return -ENODEV;
827
828 /* store the register number offset to program RC io outbound ATU */
829 offset = size >> 20;
830
831 size = resource_size(entry->res);
832 pci_addr = entry->res->start - entry->offset;
833
834 for (reg_no = 0; reg_no < (size >> 20); reg_no++) {
835 err = rockchip_pcie_prog_ob_atu(rockchip,
836 reg_no + 1 + offset,
837 AXI_WRAPPER_IO_WRITE,
838 20 - 1,
839 pci_addr + (reg_no << 20),
840 0);
841 if (err) {
842 dev_err(dev, "program RC io outbound ATU failed\n");
843 return err;
844 }
845 }
846
847 /* assign message regions */
848 rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1 + offset,
849 AXI_WRAPPER_NOR_MSG,
850 20 - 1, 0, 0);
851
852 rockchip->msg_bus_addr += ((reg_no + offset) << 20);
853 return err;
854}
855
856static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip)
857{
858 u32 value;
859 int err;
860
861 /* send PME_TURN_OFF message */
862 writel(0x0, rockchip->msg_region + PCIE_RC_SEND_PME_OFF);
863
864 /* read LTSSM and wait for falling into L2 link state */
865 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_DEBUG_OUT_0,
866 value, PCIE_LINK_IS_L2(value), 20,
867 jiffies_to_usecs(5 * HZ));
868 if (err) {
869 dev_err(rockchip->dev, "PCIe link enter L2 timeout!\n");
870 return err;
871 }
872
873 return 0;
874}
875
876static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
877{
878 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
879 int ret;
880
881 /* disable core and cli int since we don't need to ack PME_ACK */
882 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
883 PCIE_CLIENT_INT_CLI, PCIE_CLIENT_INT_MASK);
884 rockchip_pcie_write(rockchip, (u32)PCIE_CORE_INT, PCIE_CORE_INT_MASK);
885
886 ret = rockchip_pcie_wait_l2(rockchip);
887 if (ret) {
888 rockchip_pcie_enable_interrupts(rockchip);
889 return ret;
890 }
891
892 rockchip_pcie_deinit_phys(rockchip);
893
894 rockchip_pcie_disable_clocks(rockchip);
895
896 regulator_disable(rockchip->vpcie0v9);
897
898 return ret;
899}
900
901static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev)
902{
903 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
904 int err;
905
906 err = regulator_enable(rockchip->vpcie0v9);
907 if (err) {
908 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
909 return err;
910 }
911
912 err = rockchip_pcie_enable_clocks(rockchip);
913 if (err)
914 goto err_disable_0v9;
915
916 err = rockchip_pcie_host_init_port(rockchip);
917 if (err)
918 goto err_pcie_resume;
919
920 err = rockchip_pcie_cfg_atu(rockchip);
921 if (err)
922 goto err_err_deinit_port;
923
924 /* Need this to enter L1 again */
925 rockchip_pcie_update_txcredit_mui(rockchip);
926 rockchip_pcie_enable_interrupts(rockchip);
927
928 return 0;
929
930err_err_deinit_port:
931 rockchip_pcie_deinit_phys(rockchip);
932err_pcie_resume:
933 rockchip_pcie_disable_clocks(rockchip);
934err_disable_0v9:
935 regulator_disable(rockchip->vpcie0v9);
936 return err;
937}
938
939static int rockchip_pcie_probe(struct platform_device *pdev)
940{
941 struct rockchip_pcie *rockchip;
942 struct device *dev = &pdev->dev;
943 struct pci_host_bridge *bridge;
944 int err;
945
946 if (!dev->of_node)
947 return -ENODEV;
948
949 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rockchip));
950 if (!bridge)
951 return -ENOMEM;
952
953 rockchip = pci_host_bridge_priv(bridge);
954
955 platform_set_drvdata(pdev, rockchip);
956 rockchip->dev = dev;
957 rockchip->is_rc = true;
958
959 err = rockchip_pcie_parse_host_dt(rockchip);
960 if (err)
961 return err;
962
963 err = rockchip_pcie_enable_clocks(rockchip);
964 if (err)
965 return err;
966
967 err = rockchip_pcie_set_vpcie(rockchip);
968 if (err) {
969 dev_err(dev, "failed to set vpcie regulator\n");
970 goto err_set_vpcie;
971 }
972
973 err = rockchip_pcie_host_init_port(rockchip);
974 if (err)
975 goto err_vpcie;
976
977 rockchip_pcie_enable_interrupts(rockchip);
978
979 err = rockchip_pcie_init_irq_domain(rockchip);
980 if (err < 0)
981 goto err_deinit_port;
982
983 err = rockchip_pcie_cfg_atu(rockchip);
984 if (err)
985 goto err_remove_irq_domain;
986
987 rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M);
988 if (!rockchip->msg_region) {
989 err = -ENOMEM;
990 goto err_remove_irq_domain;
991 }
992
993 bridge->sysdata = rockchip;
994 bridge->ops = &rockchip_pcie_ops;
995
996 err = pci_host_probe(bridge);
997 if (err < 0)
998 goto err_remove_irq_domain;
999
1000 return 0;
1001
1002err_remove_irq_domain:
1003 irq_domain_remove(rockchip->irq_domain);
1004err_deinit_port:
1005 rockchip_pcie_deinit_phys(rockchip);
1006err_vpcie:
1007 if (!IS_ERR(rockchip->vpcie12v))
1008 regulator_disable(rockchip->vpcie12v);
1009 if (!IS_ERR(rockchip->vpcie3v3))
1010 regulator_disable(rockchip->vpcie3v3);
1011 regulator_disable(rockchip->vpcie1v8);
1012 regulator_disable(rockchip->vpcie0v9);
1013err_set_vpcie:
1014 rockchip_pcie_disable_clocks(rockchip);
1015 return err;
1016}
1017
1018static int rockchip_pcie_remove(struct platform_device *pdev)
1019{
1020 struct device *dev = &pdev->dev;
1021 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
1022 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rockchip);
1023
1024 pci_stop_root_bus(bridge->bus);
1025 pci_remove_root_bus(bridge->bus);
1026 irq_domain_remove(rockchip->irq_domain);
1027
1028 rockchip_pcie_deinit_phys(rockchip);
1029
1030 rockchip_pcie_disable_clocks(rockchip);
1031
1032 if (!IS_ERR(rockchip->vpcie12v))
1033 regulator_disable(rockchip->vpcie12v);
1034 if (!IS_ERR(rockchip->vpcie3v3))
1035 regulator_disable(rockchip->vpcie3v3);
1036 regulator_disable(rockchip->vpcie1v8);
1037 regulator_disable(rockchip->vpcie0v9);
1038
1039 return 0;
1040}
1041
1042static const struct dev_pm_ops rockchip_pcie_pm_ops = {
1043 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq,
1044 rockchip_pcie_resume_noirq)
1045};
1046
1047static const struct of_device_id rockchip_pcie_of_match[] = {
1048 { .compatible = "rockchip,rk3399-pcie", },
1049 {}
1050};
1051MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match);
1052
1053static struct platform_driver rockchip_pcie_driver = {
1054 .driver = {
1055 .name = "rockchip-pcie",
1056 .of_match_table = rockchip_pcie_of_match,
1057 .pm = &rockchip_pcie_pm_ops,
1058 },
1059 .probe = rockchip_pcie_probe,
1060 .remove = rockchip_pcie_remove,
1061};
1062module_platform_driver(rockchip_pcie_driver);
1063
1064MODULE_AUTHOR("Rockchip Inc");
1065MODULE_DESCRIPTION("Rockchip AXI PCIe driver");
1066MODULE_LICENSE("GPL v2");