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