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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 /* access only one slot on each root port */
75 if (bus->number == rockchip->root_bus_nr && dev > 0)
76 return 0;
77
78 /*
79 * do not read more than one device on the bus directly attached
80 * to RC's downstream side.
81 */
82 if (bus->primary == rockchip->root_bus_nr && dev > 0)
83 return 0;
84
85 return 1;
86}
87
88static u8 rockchip_pcie_lane_map(struct rockchip_pcie *rockchip)
89{
90 u32 val;
91 u8 map;
92
93 if (rockchip->legacy_phy)
94 return GENMASK(MAX_LANE_NUM - 1, 0);
95
96 val = rockchip_pcie_read(rockchip, PCIE_CORE_LANE_MAP);
97 map = val & PCIE_CORE_LANE_MAP_MASK;
98
99 /* The link may be using a reverse-indexed mapping. */
100 if (val & PCIE_CORE_LANE_MAP_REVERSE)
101 map = bitrev8(map) >> 4;
102
103 return map;
104}
105
106static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip,
107 int where, int size, u32 *val)
108{
109 void __iomem *addr;
110
111 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + where;
112
113 if (!IS_ALIGNED((uintptr_t)addr, size)) {
114 *val = 0;
115 return PCIBIOS_BAD_REGISTER_NUMBER;
116 }
117
118 if (size == 4) {
119 *val = readl(addr);
120 } else if (size == 2) {
121 *val = readw(addr);
122 } else if (size == 1) {
123 *val = readb(addr);
124 } else {
125 *val = 0;
126 return PCIBIOS_BAD_REGISTER_NUMBER;
127 }
128 return PCIBIOS_SUCCESSFUL;
129}
130
131static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip,
132 int where, int size, u32 val)
133{
134 u32 mask, tmp, offset;
135 void __iomem *addr;
136
137 offset = where & ~0x3;
138 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + offset;
139
140 if (size == 4) {
141 writel(val, addr);
142 return PCIBIOS_SUCCESSFUL;
143 }
144
145 mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));
146
147 /*
148 * N.B. This read/modify/write isn't safe in general because it can
149 * corrupt RW1C bits in adjacent registers. But the hardware
150 * doesn't support smaller writes.
151 */
152 tmp = readl(addr) & mask;
153 tmp |= val << ((where & 0x3) * 8);
154 writel(tmp, addr);
155
156 return PCIBIOS_SUCCESSFUL;
157}
158
159static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip,
160 struct pci_bus *bus, u32 devfn,
161 int where, int size, u32 *val)
162{
163 u32 busdev;
164
165 busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
166 PCI_FUNC(devfn), where);
167
168 if (!IS_ALIGNED(busdev, size)) {
169 *val = 0;
170 return PCIBIOS_BAD_REGISTER_NUMBER;
171 }
172
173 if (bus->parent->number == rockchip->root_bus_nr)
174 rockchip_pcie_cfg_configuration_accesses(rockchip,
175 AXI_WRAPPER_TYPE0_CFG);
176 else
177 rockchip_pcie_cfg_configuration_accesses(rockchip,
178 AXI_WRAPPER_TYPE1_CFG);
179
180 if (size == 4) {
181 *val = readl(rockchip->reg_base + busdev);
182 } else if (size == 2) {
183 *val = readw(rockchip->reg_base + busdev);
184 } else if (size == 1) {
185 *val = readb(rockchip->reg_base + busdev);
186 } else {
187 *val = 0;
188 return PCIBIOS_BAD_REGISTER_NUMBER;
189 }
190 return PCIBIOS_SUCCESSFUL;
191}
192
193static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip,
194 struct pci_bus *bus, u32 devfn,
195 int where, int size, u32 val)
196{
197 u32 busdev;
198
199 busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
200 PCI_FUNC(devfn), where);
201 if (!IS_ALIGNED(busdev, size))
202 return PCIBIOS_BAD_REGISTER_NUMBER;
203
204 if (bus->parent->number == rockchip->root_bus_nr)
205 rockchip_pcie_cfg_configuration_accesses(rockchip,
206 AXI_WRAPPER_TYPE0_CFG);
207 else
208 rockchip_pcie_cfg_configuration_accesses(rockchip,
209 AXI_WRAPPER_TYPE1_CFG);
210
211 if (size == 4)
212 writel(val, rockchip->reg_base + busdev);
213 else if (size == 2)
214 writew(val, rockchip->reg_base + busdev);
215 else if (size == 1)
216 writeb(val, rockchip->reg_base + busdev);
217 else
218 return PCIBIOS_BAD_REGISTER_NUMBER;
219
220 return PCIBIOS_SUCCESSFUL;
221}
222
223static int rockchip_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
224 int size, u32 *val)
225{
226 struct rockchip_pcie *rockchip = bus->sysdata;
227
228 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn))) {
229 *val = 0xffffffff;
230 return PCIBIOS_DEVICE_NOT_FOUND;
231 }
232
233 if (bus->number == rockchip->root_bus_nr)
234 return rockchip_pcie_rd_own_conf(rockchip, where, size, val);
235
236 return rockchip_pcie_rd_other_conf(rockchip, bus, devfn, where, size,
237 val);
238}
239
240static int rockchip_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
241 int where, int size, u32 val)
242{
243 struct rockchip_pcie *rockchip = bus->sysdata;
244
245 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn)))
246 return PCIBIOS_DEVICE_NOT_FOUND;
247
248 if (bus->number == rockchip->root_bus_nr)
249 return rockchip_pcie_wr_own_conf(rockchip, where, size, val);
250
251 return rockchip_pcie_wr_other_conf(rockchip, bus, devfn, where, size,
252 val);
253}
254
255static struct pci_ops rockchip_pcie_ops = {
256 .read = rockchip_pcie_rd_conf,
257 .write = rockchip_pcie_wr_conf,
258};
259
260static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
261{
262 int curr;
263 u32 status, scale, power;
264
265 if (IS_ERR(rockchip->vpcie3v3))
266 return;
267
268 /*
269 * Set RC's captured slot power limit and scale if
270 * vpcie3v3 available. The default values are both zero
271 * which means the software should set these two according
272 * to the actual power supply.
273 */
274 curr = regulator_get_current_limit(rockchip->vpcie3v3);
275 if (curr <= 0)
276 return;
277
278 scale = 3; /* 0.001x */
279 curr = curr / 1000; /* convert to mA */
280 power = (curr * 3300) / 1000; /* milliwatt */
281 while (power > PCIE_RC_CONFIG_DCR_CSPL_LIMIT) {
282 if (!scale) {
283 dev_warn(rockchip->dev, "invalid power supply\n");
284 return;
285 }
286 scale--;
287 power = power / 10;
288 }
289
290 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCR);
291 status |= (power << PCIE_RC_CONFIG_DCR_CSPL_SHIFT) |
292 (scale << PCIE_RC_CONFIG_DCR_CPLS_SHIFT);
293 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR);
294}
295
296/**
297 * rockchip_pcie_host_init_port - Initialize hardware
298 * @rockchip: PCIe port information
299 */
300static int rockchip_pcie_host_init_port(struct rockchip_pcie *rockchip)
301{
302 struct device *dev = rockchip->dev;
303 int err, i = MAX_LANE_NUM;
304 u32 status;
305
306 gpiod_set_value_cansleep(rockchip->ep_gpio, 0);
307
308 err = rockchip_pcie_init_port(rockchip);
309 if (err)
310 return err;
311
312 /* Fix the transmitted FTS count desired to exit from L0s. */
313 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1);
314 status = (status & ~PCIE_CORE_CTRL_PLC1_FTS_MASK) |
315 (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT);
316 rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1);
317
318 rockchip_pcie_set_power_limit(rockchip);
319
320 /* Set RC's clock architecture as common clock */
321 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
322 status |= PCI_EXP_LNKSTA_SLC << 16;
323 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
324
325 /* Set RC's RCB to 128 */
326 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
327 status |= PCI_EXP_LNKCTL_RCB;
328 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
329
330 /* Enable Gen1 training */
331 rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE,
332 PCIE_CLIENT_CONFIG);
333
334 gpiod_set_value_cansleep(rockchip->ep_gpio, 1);
335
336 /* 500ms timeout value should be enough for Gen1/2 training */
337 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_BASIC_STATUS1,
338 status, PCIE_LINK_UP(status), 20,
339 500 * USEC_PER_MSEC);
340 if (err) {
341 dev_err(dev, "PCIe link training gen1 timeout!\n");
342 goto err_power_off_phy;
343 }
344
345 if (rockchip->link_gen == 2) {
346 /*
347 * Enable retrain for gen2. This should be configured only after
348 * gen1 finished.
349 */
350 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
351 status |= PCI_EXP_LNKCTL_RL;
352 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
353
354 err = readl_poll_timeout(rockchip->apb_base + PCIE_CORE_CTRL,
355 status, PCIE_LINK_IS_GEN2(status), 20,
356 500 * USEC_PER_MSEC);
357 if (err)
358 dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n");
359 }
360
361 /* Check the final link width from negotiated lane counter from MGMT */
362 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL);
363 status = 0x1 << ((status & PCIE_CORE_PL_CONF_LANE_MASK) >>
364 PCIE_CORE_PL_CONF_LANE_SHIFT);
365 dev_dbg(dev, "current link width is x%d\n", status);
366
367 /* Power off unused lane(s) */
368 rockchip->lanes_map = rockchip_pcie_lane_map(rockchip);
369 for (i = 0; i < MAX_LANE_NUM; i++) {
370 if (!(rockchip->lanes_map & BIT(i))) {
371 dev_dbg(dev, "idling lane %d\n", i);
372 phy_power_off(rockchip->phys[i]);
373 }
374 }
375
376 rockchip_pcie_write(rockchip, ROCKCHIP_VENDOR_ID,
377 PCIE_CORE_CONFIG_VENDOR);
378 rockchip_pcie_write(rockchip,
379 PCI_CLASS_BRIDGE_PCI << PCIE_RC_CONFIG_SCC_SHIFT,
380 PCIE_RC_CONFIG_RID_CCR);
381
382 /* Clear THP cap's next cap pointer to remove L1 substate cap */
383 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_THP_CAP);
384 status &= ~PCIE_RC_CONFIG_THP_CAP_NEXT_MASK;
385 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_THP_CAP);
386
387 /* Clear L0s from RC's link cap */
388 if (of_property_read_bool(dev->of_node, "aspm-no-l0s")) {
389 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LINK_CAP);
390 status &= ~PCIE_RC_CONFIG_LINK_CAP_L0S;
391 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LINK_CAP);
392 }
393
394 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCSR);
395 status &= ~PCIE_RC_CONFIG_DCSR_MPS_MASK;
396 status |= PCIE_RC_CONFIG_DCSR_MPS_256;
397 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCSR);
398
399 return 0;
400err_power_off_phy:
401 while (i--)
402 phy_power_off(rockchip->phys[i]);
403 i = MAX_LANE_NUM;
404 while (i--)
405 phy_exit(rockchip->phys[i]);
406 return err;
407}
408
409static irqreturn_t rockchip_pcie_subsys_irq_handler(int irq, void *arg)
410{
411 struct rockchip_pcie *rockchip = arg;
412 struct device *dev = rockchip->dev;
413 u32 reg;
414 u32 sub_reg;
415
416 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
417 if (reg & PCIE_CLIENT_INT_LOCAL) {
418 dev_dbg(dev, "local interrupt received\n");
419 sub_reg = rockchip_pcie_read(rockchip, PCIE_CORE_INT_STATUS);
420 if (sub_reg & PCIE_CORE_INT_PRFPE)
421 dev_dbg(dev, "parity error detected while reading from the PNP receive FIFO RAM\n");
422
423 if (sub_reg & PCIE_CORE_INT_CRFPE)
424 dev_dbg(dev, "parity error detected while reading from the Completion Receive FIFO RAM\n");
425
426 if (sub_reg & PCIE_CORE_INT_RRPE)
427 dev_dbg(dev, "parity error detected while reading from replay buffer RAM\n");
428
429 if (sub_reg & PCIE_CORE_INT_PRFO)
430 dev_dbg(dev, "overflow occurred in the PNP receive FIFO\n");
431
432 if (sub_reg & PCIE_CORE_INT_CRFO)
433 dev_dbg(dev, "overflow occurred in the completion receive FIFO\n");
434
435 if (sub_reg & PCIE_CORE_INT_RT)
436 dev_dbg(dev, "replay timer timed out\n");
437
438 if (sub_reg & PCIE_CORE_INT_RTR)
439 dev_dbg(dev, "replay timer rolled over after 4 transmissions of the same TLP\n");
440
441 if (sub_reg & PCIE_CORE_INT_PE)
442 dev_dbg(dev, "phy error detected on receive side\n");
443
444 if (sub_reg & PCIE_CORE_INT_MTR)
445 dev_dbg(dev, "malformed TLP received from the link\n");
446
447 if (sub_reg & PCIE_CORE_INT_UCR)
448 dev_dbg(dev, "malformed TLP received from the link\n");
449
450 if (sub_reg & PCIE_CORE_INT_FCE)
451 dev_dbg(dev, "an error was observed in the flow control advertisements from the other side\n");
452
453 if (sub_reg & PCIE_CORE_INT_CT)
454 dev_dbg(dev, "a request timed out waiting for completion\n");
455
456 if (sub_reg & PCIE_CORE_INT_UTC)
457 dev_dbg(dev, "unmapped TC error\n");
458
459 if (sub_reg & PCIE_CORE_INT_MMVC)
460 dev_dbg(dev, "MSI mask register changes\n");
461
462 rockchip_pcie_write(rockchip, sub_reg, PCIE_CORE_INT_STATUS);
463 } else if (reg & PCIE_CLIENT_INT_PHY) {
464 dev_dbg(dev, "phy link changes\n");
465 rockchip_pcie_update_txcredit_mui(rockchip);
466 rockchip_pcie_clr_bw_int(rockchip);
467 }
468
469 rockchip_pcie_write(rockchip, reg & PCIE_CLIENT_INT_LOCAL,
470 PCIE_CLIENT_INT_STATUS);
471
472 return IRQ_HANDLED;
473}
474
475static irqreturn_t rockchip_pcie_client_irq_handler(int irq, void *arg)
476{
477 struct rockchip_pcie *rockchip = arg;
478 struct device *dev = rockchip->dev;
479 u32 reg;
480
481 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
482 if (reg & PCIE_CLIENT_INT_LEGACY_DONE)
483 dev_dbg(dev, "legacy done interrupt received\n");
484
485 if (reg & PCIE_CLIENT_INT_MSG)
486 dev_dbg(dev, "message done interrupt received\n");
487
488 if (reg & PCIE_CLIENT_INT_HOT_RST)
489 dev_dbg(dev, "hot reset interrupt received\n");
490
491 if (reg & PCIE_CLIENT_INT_DPA)
492 dev_dbg(dev, "dpa interrupt received\n");
493
494 if (reg & PCIE_CLIENT_INT_FATAL_ERR)
495 dev_dbg(dev, "fatal error interrupt received\n");
496
497 if (reg & PCIE_CLIENT_INT_NFATAL_ERR)
498 dev_dbg(dev, "no fatal error interrupt received\n");
499
500 if (reg & PCIE_CLIENT_INT_CORR_ERR)
501 dev_dbg(dev, "correctable error interrupt received\n");
502
503 if (reg & PCIE_CLIENT_INT_PHY)
504 dev_dbg(dev, "phy interrupt received\n");
505
506 rockchip_pcie_write(rockchip, reg & (PCIE_CLIENT_INT_LEGACY_DONE |
507 PCIE_CLIENT_INT_MSG | PCIE_CLIENT_INT_HOT_RST |
508 PCIE_CLIENT_INT_DPA | PCIE_CLIENT_INT_FATAL_ERR |
509 PCIE_CLIENT_INT_NFATAL_ERR |
510 PCIE_CLIENT_INT_CORR_ERR |
511 PCIE_CLIENT_INT_PHY),
512 PCIE_CLIENT_INT_STATUS);
513
514 return IRQ_HANDLED;
515}
516
517static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
518{
519 struct irq_chip *chip = irq_desc_get_chip(desc);
520 struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc);
521 struct device *dev = rockchip->dev;
522 u32 reg;
523 u32 hwirq;
524 u32 virq;
525
526 chained_irq_enter(chip, desc);
527
528 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
529 reg = (reg & PCIE_CLIENT_INTR_MASK) >> PCIE_CLIENT_INTR_SHIFT;
530
531 while (reg) {
532 hwirq = ffs(reg) - 1;
533 reg &= ~BIT(hwirq);
534
535 virq = irq_find_mapping(rockchip->irq_domain, hwirq);
536 if (virq)
537 generic_handle_irq(virq);
538 else
539 dev_err(dev, "unexpected IRQ, INT%d\n", hwirq);
540 }
541
542 chained_irq_exit(chip, desc);
543}
544
545static int rockchip_pcie_setup_irq(struct rockchip_pcie *rockchip)
546{
547 int irq, err;
548 struct device *dev = rockchip->dev;
549 struct platform_device *pdev = to_platform_device(dev);
550
551 irq = platform_get_irq_byname(pdev, "sys");
552 if (irq < 0) {
553 dev_err(dev, "missing sys IRQ resource\n");
554 return irq;
555 }
556
557 err = devm_request_irq(dev, irq, rockchip_pcie_subsys_irq_handler,
558 IRQF_SHARED, "pcie-sys", rockchip);
559 if (err) {
560 dev_err(dev, "failed to request PCIe subsystem IRQ\n");
561 return err;
562 }
563
564 irq = platform_get_irq_byname(pdev, "legacy");
565 if (irq < 0) {
566 dev_err(dev, "missing legacy IRQ resource\n");
567 return irq;
568 }
569
570 irq_set_chained_handler_and_data(irq,
571 rockchip_pcie_legacy_int_handler,
572 rockchip);
573
574 irq = platform_get_irq_byname(pdev, "client");
575 if (irq < 0) {
576 dev_err(dev, "missing client IRQ resource\n");
577 return irq;
578 }
579
580 err = devm_request_irq(dev, irq, rockchip_pcie_client_irq_handler,
581 IRQF_SHARED, "pcie-client", rockchip);
582 if (err) {
583 dev_err(dev, "failed to request PCIe client IRQ\n");
584 return err;
585 }
586
587 return 0;
588}
589
590/**
591 * rockchip_pcie_parse_host_dt - Parse Device Tree
592 * @rockchip: PCIe port information
593 *
594 * Return: '0' on success and error value on failure
595 */
596static int rockchip_pcie_parse_host_dt(struct rockchip_pcie *rockchip)
597{
598 struct device *dev = rockchip->dev;
599 int err;
600
601 err = rockchip_pcie_parse_dt(rockchip);
602 if (err)
603 return err;
604
605 err = rockchip_pcie_setup_irq(rockchip);
606 if (err)
607 return err;
608
609 rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v");
610 if (IS_ERR(rockchip->vpcie12v)) {
611 if (PTR_ERR(rockchip->vpcie12v) != -ENODEV)
612 return PTR_ERR(rockchip->vpcie12v);
613 dev_info(dev, "no vpcie12v regulator found\n");
614 }
615
616 rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
617 if (IS_ERR(rockchip->vpcie3v3)) {
618 if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
619 return PTR_ERR(rockchip->vpcie3v3);
620 dev_info(dev, "no vpcie3v3 regulator found\n");
621 }
622
623 rockchip->vpcie1v8 = devm_regulator_get_optional(dev, "vpcie1v8");
624 if (IS_ERR(rockchip->vpcie1v8)) {
625 if (PTR_ERR(rockchip->vpcie1v8) != -ENODEV)
626 return PTR_ERR(rockchip->vpcie1v8);
627 dev_info(dev, "no vpcie1v8 regulator found\n");
628 }
629
630 rockchip->vpcie0v9 = devm_regulator_get_optional(dev, "vpcie0v9");
631 if (IS_ERR(rockchip->vpcie0v9)) {
632 if (PTR_ERR(rockchip->vpcie0v9) != -ENODEV)
633 return PTR_ERR(rockchip->vpcie0v9);
634 dev_info(dev, "no vpcie0v9 regulator found\n");
635 }
636
637 return 0;
638}
639
640static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
641{
642 struct device *dev = rockchip->dev;
643 int err;
644
645 if (!IS_ERR(rockchip->vpcie12v)) {
646 err = regulator_enable(rockchip->vpcie12v);
647 if (err) {
648 dev_err(dev, "fail to enable vpcie12v regulator\n");
649 goto err_out;
650 }
651 }
652
653 if (!IS_ERR(rockchip->vpcie3v3)) {
654 err = regulator_enable(rockchip->vpcie3v3);
655 if (err) {
656 dev_err(dev, "fail to enable vpcie3v3 regulator\n");
657 goto err_disable_12v;
658 }
659 }
660
661 if (!IS_ERR(rockchip->vpcie1v8)) {
662 err = regulator_enable(rockchip->vpcie1v8);
663 if (err) {
664 dev_err(dev, "fail to enable vpcie1v8 regulator\n");
665 goto err_disable_3v3;
666 }
667 }
668
669 if (!IS_ERR(rockchip->vpcie0v9)) {
670 err = regulator_enable(rockchip->vpcie0v9);
671 if (err) {
672 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
673 goto err_disable_1v8;
674 }
675 }
676
677 return 0;
678
679err_disable_1v8:
680 if (!IS_ERR(rockchip->vpcie1v8))
681 regulator_disable(rockchip->vpcie1v8);
682err_disable_3v3:
683 if (!IS_ERR(rockchip->vpcie3v3))
684 regulator_disable(rockchip->vpcie3v3);
685err_disable_12v:
686 if (!IS_ERR(rockchip->vpcie12v))
687 regulator_disable(rockchip->vpcie12v);
688err_out:
689 return err;
690}
691
692static void rockchip_pcie_enable_interrupts(struct rockchip_pcie *rockchip)
693{
694 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) &
695 (~PCIE_CLIENT_INT_CLI), PCIE_CLIENT_INT_MASK);
696 rockchip_pcie_write(rockchip, (u32)(~PCIE_CORE_INT),
697 PCIE_CORE_INT_MASK);
698
699 rockchip_pcie_enable_bw_int(rockchip);
700}
701
702static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
703 irq_hw_number_t hwirq)
704{
705 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
706 irq_set_chip_data(irq, domain->host_data);
707
708 return 0;
709}
710
711static const struct irq_domain_ops intx_domain_ops = {
712 .map = rockchip_pcie_intx_map,
713};
714
715static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
716{
717 struct device *dev = rockchip->dev;
718 struct device_node *intc = of_get_next_child(dev->of_node, NULL);
719
720 if (!intc) {
721 dev_err(dev, "missing child interrupt-controller node\n");
722 return -EINVAL;
723 }
724
725 rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
726 &intx_domain_ops, rockchip);
727 of_node_put(intc);
728 if (!rockchip->irq_domain) {
729 dev_err(dev, "failed to get a INTx IRQ domain\n");
730 return -EINVAL;
731 }
732
733 return 0;
734}
735
736static int rockchip_pcie_prog_ob_atu(struct rockchip_pcie *rockchip,
737 int region_no, int type, u8 num_pass_bits,
738 u32 lower_addr, u32 upper_addr)
739{
740 u32 ob_addr_0;
741 u32 ob_addr_1;
742 u32 ob_desc_0;
743 u32 aw_offset;
744
745 if (region_no >= MAX_AXI_WRAPPER_REGION_NUM)
746 return -EINVAL;
747 if (num_pass_bits + 1 < 8)
748 return -EINVAL;
749 if (num_pass_bits > 63)
750 return -EINVAL;
751 if (region_no == 0) {
752 if (AXI_REGION_0_SIZE < (2ULL << num_pass_bits))
753 return -EINVAL;
754 }
755 if (region_no != 0) {
756 if (AXI_REGION_SIZE < (2ULL << num_pass_bits))
757 return -EINVAL;
758 }
759
760 aw_offset = (region_no << OB_REG_SIZE_SHIFT);
761
762 ob_addr_0 = num_pass_bits & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS;
763 ob_addr_0 |= lower_addr & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR;
764 ob_addr_1 = upper_addr;
765 ob_desc_0 = (1 << 23 | type);
766
767 rockchip_pcie_write(rockchip, ob_addr_0,
768 PCIE_CORE_OB_REGION_ADDR0 + aw_offset);
769 rockchip_pcie_write(rockchip, ob_addr_1,
770 PCIE_CORE_OB_REGION_ADDR1 + aw_offset);
771 rockchip_pcie_write(rockchip, ob_desc_0,
772 PCIE_CORE_OB_REGION_DESC0 + aw_offset);
773 rockchip_pcie_write(rockchip, 0,
774 PCIE_CORE_OB_REGION_DESC1 + aw_offset);
775
776 return 0;
777}
778
779static int rockchip_pcie_prog_ib_atu(struct rockchip_pcie *rockchip,
780 int region_no, u8 num_pass_bits,
781 u32 lower_addr, u32 upper_addr)
782{
783 u32 ib_addr_0;
784 u32 ib_addr_1;
785 u32 aw_offset;
786
787 if (region_no > MAX_AXI_IB_ROOTPORT_REGION_NUM)
788 return -EINVAL;
789 if (num_pass_bits + 1 < MIN_AXI_ADDR_BITS_PASSED)
790 return -EINVAL;
791 if (num_pass_bits > 63)
792 return -EINVAL;
793
794 aw_offset = (region_no << IB_ROOT_PORT_REG_SIZE_SHIFT);
795
796 ib_addr_0 = num_pass_bits & PCIE_CORE_IB_REGION_ADDR0_NUM_BITS;
797 ib_addr_0 |= (lower_addr << 8) & PCIE_CORE_IB_REGION_ADDR0_LO_ADDR;
798 ib_addr_1 = upper_addr;
799
800 rockchip_pcie_write(rockchip, ib_addr_0, PCIE_RP_IB_ADDR0 + aw_offset);
801 rockchip_pcie_write(rockchip, ib_addr_1, PCIE_RP_IB_ADDR1 + aw_offset);
802
803 return 0;
804}
805
806static int rockchip_pcie_cfg_atu(struct rockchip_pcie *rockchip)
807{
808 struct device *dev = rockchip->dev;
809 int offset;
810 int err;
811 int reg_no;
812
813 rockchip_pcie_cfg_configuration_accesses(rockchip,
814 AXI_WRAPPER_TYPE0_CFG);
815
816 for (reg_no = 0; reg_no < (rockchip->mem_size >> 20); reg_no++) {
817 err = rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1,
818 AXI_WRAPPER_MEM_WRITE,
819 20 - 1,
820 rockchip->mem_bus_addr +
821 (reg_no << 20),
822 0);
823 if (err) {
824 dev_err(dev, "program RC mem outbound ATU failed\n");
825 return err;
826 }
827 }
828
829 err = rockchip_pcie_prog_ib_atu(rockchip, 2, 32 - 1, 0x0, 0);
830 if (err) {
831 dev_err(dev, "program RC mem inbound ATU failed\n");
832 return err;
833 }
834
835 offset = rockchip->mem_size >> 20;
836 for (reg_no = 0; reg_no < (rockchip->io_size >> 20); reg_no++) {
837 err = rockchip_pcie_prog_ob_atu(rockchip,
838 reg_no + 1 + offset,
839 AXI_WRAPPER_IO_WRITE,
840 20 - 1,
841 rockchip->io_bus_addr +
842 (reg_no << 20),
843 0);
844 if (err) {
845 dev_err(dev, "program RC io outbound ATU failed\n");
846 return err;
847 }
848 }
849
850 /* assign message regions */
851 rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1 + offset,
852 AXI_WRAPPER_NOR_MSG,
853 20 - 1, 0, 0);
854
855 rockchip->msg_bus_addr = rockchip->mem_bus_addr +
856 ((reg_no + offset) << 20);
857 return err;
858}
859
860static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip)
861{
862 u32 value;
863 int err;
864
865 /* send PME_TURN_OFF message */
866 writel(0x0, rockchip->msg_region + PCIE_RC_SEND_PME_OFF);
867
868 /* read LTSSM and wait for falling into L2 link state */
869 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_DEBUG_OUT_0,
870 value, PCIE_LINK_IS_L2(value), 20,
871 jiffies_to_usecs(5 * HZ));
872 if (err) {
873 dev_err(rockchip->dev, "PCIe link enter L2 timeout!\n");
874 return err;
875 }
876
877 return 0;
878}
879
880static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
881{
882 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
883 int ret;
884
885 /* disable core and cli int since we don't need to ack PME_ACK */
886 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
887 PCIE_CLIENT_INT_CLI, PCIE_CLIENT_INT_MASK);
888 rockchip_pcie_write(rockchip, (u32)PCIE_CORE_INT, PCIE_CORE_INT_MASK);
889
890 ret = rockchip_pcie_wait_l2(rockchip);
891 if (ret) {
892 rockchip_pcie_enable_interrupts(rockchip);
893 return ret;
894 }
895
896 rockchip_pcie_deinit_phys(rockchip);
897
898 rockchip_pcie_disable_clocks(rockchip);
899
900 if (!IS_ERR(rockchip->vpcie0v9))
901 regulator_disable(rockchip->vpcie0v9);
902
903 return ret;
904}
905
906static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev)
907{
908 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
909 int err;
910
911 if (!IS_ERR(rockchip->vpcie0v9)) {
912 err = regulator_enable(rockchip->vpcie0v9);
913 if (err) {
914 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
915 return err;
916 }
917 }
918
919 err = rockchip_pcie_enable_clocks(rockchip);
920 if (err)
921 goto err_disable_0v9;
922
923 err = rockchip_pcie_host_init_port(rockchip);
924 if (err)
925 goto err_pcie_resume;
926
927 err = rockchip_pcie_cfg_atu(rockchip);
928 if (err)
929 goto err_err_deinit_port;
930
931 /* Need this to enter L1 again */
932 rockchip_pcie_update_txcredit_mui(rockchip);
933 rockchip_pcie_enable_interrupts(rockchip);
934
935 return 0;
936
937err_err_deinit_port:
938 rockchip_pcie_deinit_phys(rockchip);
939err_pcie_resume:
940 rockchip_pcie_disable_clocks(rockchip);
941err_disable_0v9:
942 if (!IS_ERR(rockchip->vpcie0v9))
943 regulator_disable(rockchip->vpcie0v9);
944 return err;
945}
946
947static int rockchip_pcie_probe(struct platform_device *pdev)
948{
949 struct rockchip_pcie *rockchip;
950 struct device *dev = &pdev->dev;
951 struct pci_bus *bus, *child;
952 struct pci_host_bridge *bridge;
953 struct resource_entry *win;
954 resource_size_t io_base;
955 struct resource *mem;
956 struct resource *io;
957 int err;
958
959 LIST_HEAD(res);
960
961 if (!dev->of_node)
962 return -ENODEV;
963
964 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rockchip));
965 if (!bridge)
966 return -ENOMEM;
967
968 rockchip = pci_host_bridge_priv(bridge);
969
970 platform_set_drvdata(pdev, rockchip);
971 rockchip->dev = dev;
972 rockchip->is_rc = true;
973
974 err = rockchip_pcie_parse_host_dt(rockchip);
975 if (err)
976 return err;
977
978 err = rockchip_pcie_enable_clocks(rockchip);
979 if (err)
980 return err;
981
982 err = rockchip_pcie_set_vpcie(rockchip);
983 if (err) {
984 dev_err(dev, "failed to set vpcie regulator\n");
985 goto err_set_vpcie;
986 }
987
988 err = rockchip_pcie_host_init_port(rockchip);
989 if (err)
990 goto err_vpcie;
991
992 rockchip_pcie_enable_interrupts(rockchip);
993
994 err = rockchip_pcie_init_irq_domain(rockchip);
995 if (err < 0)
996 goto err_deinit_port;
997
998 err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
999 &res, &io_base);
1000 if (err)
1001 goto err_remove_irq_domain;
1002
1003 err = devm_request_pci_bus_resources(dev, &res);
1004 if (err)
1005 goto err_free_res;
1006
1007 /* Get the I/O and memory ranges from DT */
1008 resource_list_for_each_entry(win, &res) {
1009 switch (resource_type(win->res)) {
1010 case IORESOURCE_IO:
1011 io = win->res;
1012 io->name = "I/O";
1013 rockchip->io_size = resource_size(io);
1014 rockchip->io_bus_addr = io->start - win->offset;
1015 err = pci_remap_iospace(io, io_base);
1016 if (err) {
1017 dev_warn(dev, "error %d: failed to map resource %pR\n",
1018 err, io);
1019 continue;
1020 }
1021 rockchip->io = io;
1022 break;
1023 case IORESOURCE_MEM:
1024 mem = win->res;
1025 mem->name = "MEM";
1026 rockchip->mem_size = resource_size(mem);
1027 rockchip->mem_bus_addr = mem->start - win->offset;
1028 break;
1029 case IORESOURCE_BUS:
1030 rockchip->root_bus_nr = win->res->start;
1031 break;
1032 default:
1033 continue;
1034 }
1035 }
1036
1037 err = rockchip_pcie_cfg_atu(rockchip);
1038 if (err)
1039 goto err_unmap_iospace;
1040
1041 rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M);
1042 if (!rockchip->msg_region) {
1043 err = -ENOMEM;
1044 goto err_unmap_iospace;
1045 }
1046
1047 list_splice_init(&res, &bridge->windows);
1048 bridge->dev.parent = dev;
1049 bridge->sysdata = rockchip;
1050 bridge->busnr = 0;
1051 bridge->ops = &rockchip_pcie_ops;
1052 bridge->map_irq = of_irq_parse_and_map_pci;
1053 bridge->swizzle_irq = pci_common_swizzle;
1054
1055 err = pci_scan_root_bus_bridge(bridge);
1056 if (err < 0)
1057 goto err_unmap_iospace;
1058
1059 bus = bridge->bus;
1060
1061 rockchip->root_bus = bus;
1062
1063 pci_bus_size_bridges(bus);
1064 pci_bus_assign_resources(bus);
1065 list_for_each_entry(child, &bus->children, node)
1066 pcie_bus_configure_settings(child);
1067
1068 pci_bus_add_devices(bus);
1069 return 0;
1070
1071err_unmap_iospace:
1072 pci_unmap_iospace(rockchip->io);
1073err_free_res:
1074 pci_free_resource_list(&res);
1075err_remove_irq_domain:
1076 irq_domain_remove(rockchip->irq_domain);
1077err_deinit_port:
1078 rockchip_pcie_deinit_phys(rockchip);
1079err_vpcie:
1080 if (!IS_ERR(rockchip->vpcie12v))
1081 regulator_disable(rockchip->vpcie12v);
1082 if (!IS_ERR(rockchip->vpcie3v3))
1083 regulator_disable(rockchip->vpcie3v3);
1084 if (!IS_ERR(rockchip->vpcie1v8))
1085 regulator_disable(rockchip->vpcie1v8);
1086 if (!IS_ERR(rockchip->vpcie0v9))
1087 regulator_disable(rockchip->vpcie0v9);
1088err_set_vpcie:
1089 rockchip_pcie_disable_clocks(rockchip);
1090 return err;
1091}
1092
1093static int rockchip_pcie_remove(struct platform_device *pdev)
1094{
1095 struct device *dev = &pdev->dev;
1096 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
1097
1098 pci_stop_root_bus(rockchip->root_bus);
1099 pci_remove_root_bus(rockchip->root_bus);
1100 pci_unmap_iospace(rockchip->io);
1101 irq_domain_remove(rockchip->irq_domain);
1102
1103 rockchip_pcie_deinit_phys(rockchip);
1104
1105 rockchip_pcie_disable_clocks(rockchip);
1106
1107 if (!IS_ERR(rockchip->vpcie12v))
1108 regulator_disable(rockchip->vpcie12v);
1109 if (!IS_ERR(rockchip->vpcie3v3))
1110 regulator_disable(rockchip->vpcie3v3);
1111 if (!IS_ERR(rockchip->vpcie1v8))
1112 regulator_disable(rockchip->vpcie1v8);
1113 if (!IS_ERR(rockchip->vpcie0v9))
1114 regulator_disable(rockchip->vpcie0v9);
1115
1116 return 0;
1117}
1118
1119static const struct dev_pm_ops rockchip_pcie_pm_ops = {
1120 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq,
1121 rockchip_pcie_resume_noirq)
1122};
1123
1124static const struct of_device_id rockchip_pcie_of_match[] = {
1125 { .compatible = "rockchip,rk3399-pcie", },
1126 {}
1127};
1128MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match);
1129
1130static struct platform_driver rockchip_pcie_driver = {
1131 .driver = {
1132 .name = "rockchip-pcie",
1133 .of_match_table = rockchip_pcie_of_match,
1134 .pm = &rockchip_pcie_pm_ops,
1135 },
1136 .probe = rockchip_pcie_probe,
1137 .remove = rockchip_pcie_remove,
1138};
1139module_platform_driver(rockchip_pcie_driver);
1140
1141MODULE_AUTHOR("Rockchip Inc");
1142MODULE_DESCRIPTION("Rockchip AXI PCIe driver");
1143MODULE_LICENSE("GPL v2");
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/pci.h>
32#include <linux/pci_ids.h>
33#include <linux/phy/phy.h>
34#include <linux/platform_device.h>
35#include <linux/reset.h>
36#include <linux/regmap.h>
37
38#include "../pci.h"
39#include "pcie-rockchip.h"
40
41static void rockchip_pcie_enable_bw_int(struct rockchip_pcie *rockchip)
42{
43 u32 status;
44
45 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
46 status |= (PCI_EXP_LNKCTL_LBMIE | PCI_EXP_LNKCTL_LABIE);
47 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
48}
49
50static void rockchip_pcie_clr_bw_int(struct rockchip_pcie *rockchip)
51{
52 u32 status;
53
54 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
55 status |= (PCI_EXP_LNKSTA_LBMS | PCI_EXP_LNKSTA_LABS) << 16;
56 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
57}
58
59static void rockchip_pcie_update_txcredit_mui(struct rockchip_pcie *rockchip)
60{
61 u32 val;
62
63 /* Update Tx credit maximum update interval */
64 val = rockchip_pcie_read(rockchip, PCIE_CORE_TXCREDIT_CFG1);
65 val &= ~PCIE_CORE_TXCREDIT_CFG1_MUI_MASK;
66 val |= PCIE_CORE_TXCREDIT_CFG1_MUI_ENCODE(24000); /* ns */
67 rockchip_pcie_write(rockchip, val, PCIE_CORE_TXCREDIT_CFG1);
68}
69
70static int rockchip_pcie_valid_device(struct rockchip_pcie *rockchip,
71 struct pci_bus *bus, int dev)
72{
73 /*
74 * Access only one slot on each root port.
75 * Do not read more than one device on the bus directly attached
76 * to RC's downstream side.
77 */
78 if (pci_is_root_bus(bus) || pci_is_root_bus(bus->parent))
79 return dev == 0;
80
81 return 1;
82}
83
84static u8 rockchip_pcie_lane_map(struct rockchip_pcie *rockchip)
85{
86 u32 val;
87 u8 map;
88
89 if (rockchip->legacy_phy)
90 return GENMASK(MAX_LANE_NUM - 1, 0);
91
92 val = rockchip_pcie_read(rockchip, PCIE_CORE_LANE_MAP);
93 map = val & PCIE_CORE_LANE_MAP_MASK;
94
95 /* The link may be using a reverse-indexed mapping. */
96 if (val & PCIE_CORE_LANE_MAP_REVERSE)
97 map = bitrev8(map) >> 4;
98
99 return map;
100}
101
102static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip,
103 int where, int size, u32 *val)
104{
105 void __iomem *addr;
106
107 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + where;
108
109 if (!IS_ALIGNED((uintptr_t)addr, size)) {
110 *val = 0;
111 return PCIBIOS_BAD_REGISTER_NUMBER;
112 }
113
114 if (size == 4) {
115 *val = readl(addr);
116 } else if (size == 2) {
117 *val = readw(addr);
118 } else if (size == 1) {
119 *val = readb(addr);
120 } else {
121 *val = 0;
122 return PCIBIOS_BAD_REGISTER_NUMBER;
123 }
124 return PCIBIOS_SUCCESSFUL;
125}
126
127static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip,
128 int where, int size, u32 val)
129{
130 u32 mask, tmp, offset;
131 void __iomem *addr;
132
133 offset = where & ~0x3;
134 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + offset;
135
136 if (size == 4) {
137 writel(val, addr);
138 return PCIBIOS_SUCCESSFUL;
139 }
140
141 mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));
142
143 /*
144 * N.B. This read/modify/write isn't safe in general because it can
145 * corrupt RW1C bits in adjacent registers. But the hardware
146 * doesn't support smaller writes.
147 */
148 tmp = readl(addr) & mask;
149 tmp |= val << ((where & 0x3) * 8);
150 writel(tmp, addr);
151
152 return PCIBIOS_SUCCESSFUL;
153}
154
155static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip,
156 struct pci_bus *bus, u32 devfn,
157 int where, int size, u32 *val)
158{
159 void __iomem *addr;
160
161 addr = rockchip->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
162
163 if (!IS_ALIGNED((uintptr_t)addr, size)) {
164 *val = 0;
165 return PCIBIOS_BAD_REGISTER_NUMBER;
166 }
167
168 if (pci_is_root_bus(bus->parent))
169 rockchip_pcie_cfg_configuration_accesses(rockchip,
170 AXI_WRAPPER_TYPE0_CFG);
171 else
172 rockchip_pcie_cfg_configuration_accesses(rockchip,
173 AXI_WRAPPER_TYPE1_CFG);
174
175 if (size == 4) {
176 *val = readl(addr);
177 } else if (size == 2) {
178 *val = readw(addr);
179 } else if (size == 1) {
180 *val = readb(addr);
181 } else {
182 *val = 0;
183 return PCIBIOS_BAD_REGISTER_NUMBER;
184 }
185 return PCIBIOS_SUCCESSFUL;
186}
187
188static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip,
189 struct pci_bus *bus, u32 devfn,
190 int where, int size, u32 val)
191{
192 void __iomem *addr;
193
194 addr = rockchip->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
195
196 if (!IS_ALIGNED((uintptr_t)addr, size))
197 return PCIBIOS_BAD_REGISTER_NUMBER;
198
199 if (pci_is_root_bus(bus->parent))
200 rockchip_pcie_cfg_configuration_accesses(rockchip,
201 AXI_WRAPPER_TYPE0_CFG);
202 else
203 rockchip_pcie_cfg_configuration_accesses(rockchip,
204 AXI_WRAPPER_TYPE1_CFG);
205
206 if (size == 4)
207 writel(val, addr);
208 else if (size == 2)
209 writew(val, addr);
210 else if (size == 1)
211 writeb(val, addr);
212 else
213 return PCIBIOS_BAD_REGISTER_NUMBER;
214
215 return PCIBIOS_SUCCESSFUL;
216}
217
218static int rockchip_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
219 int size, u32 *val)
220{
221 struct rockchip_pcie *rockchip = bus->sysdata;
222
223 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn)))
224 return PCIBIOS_DEVICE_NOT_FOUND;
225
226 if (pci_is_root_bus(bus))
227 return rockchip_pcie_rd_own_conf(rockchip, where, size, val);
228
229 return rockchip_pcie_rd_other_conf(rockchip, bus, devfn, where, size,
230 val);
231}
232
233static int rockchip_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
234 int where, int size, u32 val)
235{
236 struct rockchip_pcie *rockchip = bus->sysdata;
237
238 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn)))
239 return PCIBIOS_DEVICE_NOT_FOUND;
240
241 if (pci_is_root_bus(bus))
242 return rockchip_pcie_wr_own_conf(rockchip, where, size, val);
243
244 return rockchip_pcie_wr_other_conf(rockchip, bus, devfn, where, size,
245 val);
246}
247
248static struct pci_ops rockchip_pcie_ops = {
249 .read = rockchip_pcie_rd_conf,
250 .write = rockchip_pcie_wr_conf,
251};
252
253static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
254{
255 int curr;
256 u32 status, scale, power;
257
258 if (IS_ERR(rockchip->vpcie3v3))
259 return;
260
261 /*
262 * Set RC's captured slot power limit and scale if
263 * vpcie3v3 available. The default values are both zero
264 * which means the software should set these two according
265 * to the actual power supply.
266 */
267 curr = regulator_get_current_limit(rockchip->vpcie3v3);
268 if (curr <= 0)
269 return;
270
271 scale = 3; /* 0.001x */
272 curr = curr / 1000; /* convert to mA */
273 power = (curr * 3300) / 1000; /* milliwatt */
274 while (power > PCIE_RC_CONFIG_DCR_CSPL_LIMIT) {
275 if (!scale) {
276 dev_warn(rockchip->dev, "invalid power supply\n");
277 return;
278 }
279 scale--;
280 power = power / 10;
281 }
282
283 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCR);
284 status |= (power << PCIE_RC_CONFIG_DCR_CSPL_SHIFT) |
285 (scale << PCIE_RC_CONFIG_DCR_CPLS_SHIFT);
286 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR);
287}
288
289/**
290 * rockchip_pcie_host_init_port - Initialize hardware
291 * @rockchip: PCIe port information
292 */
293static int rockchip_pcie_host_init_port(struct rockchip_pcie *rockchip)
294{
295 struct device *dev = rockchip->dev;
296 int err, i = MAX_LANE_NUM;
297 u32 status;
298
299 gpiod_set_value_cansleep(rockchip->ep_gpio, 0);
300
301 err = rockchip_pcie_init_port(rockchip);
302 if (err)
303 return err;
304
305 /* Fix the transmitted FTS count desired to exit from L0s. */
306 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1);
307 status = (status & ~PCIE_CORE_CTRL_PLC1_FTS_MASK) |
308 (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT);
309 rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1);
310
311 rockchip_pcie_set_power_limit(rockchip);
312
313 /* Set RC's clock architecture as common clock */
314 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
315 status |= PCI_EXP_LNKSTA_SLC << 16;
316 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
317
318 /* Set RC's RCB to 128 */
319 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
320 status |= PCI_EXP_LNKCTL_RCB;
321 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
322
323 /* Enable Gen1 training */
324 rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE,
325 PCIE_CLIENT_CONFIG);
326
327 gpiod_set_value_cansleep(rockchip->ep_gpio, 1);
328
329 /* 500ms timeout value should be enough for Gen1/2 training */
330 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_BASIC_STATUS1,
331 status, PCIE_LINK_UP(status), 20,
332 500 * USEC_PER_MSEC);
333 if (err) {
334 dev_err(dev, "PCIe link training gen1 timeout!\n");
335 goto err_power_off_phy;
336 }
337
338 if (rockchip->link_gen == 2) {
339 /*
340 * Enable retrain for gen2. This should be configured only after
341 * gen1 finished.
342 */
343 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
344 status |= PCI_EXP_LNKCTL_RL;
345 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
346
347 err = readl_poll_timeout(rockchip->apb_base + PCIE_CORE_CTRL,
348 status, PCIE_LINK_IS_GEN2(status), 20,
349 500 * USEC_PER_MSEC);
350 if (err)
351 dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n");
352 }
353
354 /* Check the final link width from negotiated lane counter from MGMT */
355 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL);
356 status = 0x1 << ((status & PCIE_CORE_PL_CONF_LANE_MASK) >>
357 PCIE_CORE_PL_CONF_LANE_SHIFT);
358 dev_dbg(dev, "current link width is x%d\n", status);
359
360 /* Power off unused lane(s) */
361 rockchip->lanes_map = rockchip_pcie_lane_map(rockchip);
362 for (i = 0; i < MAX_LANE_NUM; i++) {
363 if (!(rockchip->lanes_map & BIT(i))) {
364 dev_dbg(dev, "idling lane %d\n", i);
365 phy_power_off(rockchip->phys[i]);
366 }
367 }
368
369 rockchip_pcie_write(rockchip, ROCKCHIP_VENDOR_ID,
370 PCIE_CORE_CONFIG_VENDOR);
371 rockchip_pcie_write(rockchip,
372 PCI_CLASS_BRIDGE_PCI_NORMAL << 8,
373 PCIE_RC_CONFIG_RID_CCR);
374
375 /* Clear THP cap's next cap pointer to remove L1 substate cap */
376 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_THP_CAP);
377 status &= ~PCIE_RC_CONFIG_THP_CAP_NEXT_MASK;
378 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_THP_CAP);
379
380 /* Clear L0s from RC's link cap */
381 if (of_property_read_bool(dev->of_node, "aspm-no-l0s")) {
382 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LINK_CAP);
383 status &= ~PCIE_RC_CONFIG_LINK_CAP_L0S;
384 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LINK_CAP);
385 }
386
387 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCSR);
388 status &= ~PCIE_RC_CONFIG_DCSR_MPS_MASK;
389 status |= PCIE_RC_CONFIG_DCSR_MPS_256;
390 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCSR);
391
392 return 0;
393err_power_off_phy:
394 while (i--)
395 phy_power_off(rockchip->phys[i]);
396 i = MAX_LANE_NUM;
397 while (i--)
398 phy_exit(rockchip->phys[i]);
399 return err;
400}
401
402static irqreturn_t rockchip_pcie_subsys_irq_handler(int irq, void *arg)
403{
404 struct rockchip_pcie *rockchip = arg;
405 struct device *dev = rockchip->dev;
406 u32 reg;
407 u32 sub_reg;
408
409 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
410 if (reg & PCIE_CLIENT_INT_LOCAL) {
411 dev_dbg(dev, "local interrupt received\n");
412 sub_reg = rockchip_pcie_read(rockchip, PCIE_CORE_INT_STATUS);
413 if (sub_reg & PCIE_CORE_INT_PRFPE)
414 dev_dbg(dev, "parity error detected while reading from the PNP receive FIFO RAM\n");
415
416 if (sub_reg & PCIE_CORE_INT_CRFPE)
417 dev_dbg(dev, "parity error detected while reading from the Completion Receive FIFO RAM\n");
418
419 if (sub_reg & PCIE_CORE_INT_RRPE)
420 dev_dbg(dev, "parity error detected while reading from replay buffer RAM\n");
421
422 if (sub_reg & PCIE_CORE_INT_PRFO)
423 dev_dbg(dev, "overflow occurred in the PNP receive FIFO\n");
424
425 if (sub_reg & PCIE_CORE_INT_CRFO)
426 dev_dbg(dev, "overflow occurred in the completion receive FIFO\n");
427
428 if (sub_reg & PCIE_CORE_INT_RT)
429 dev_dbg(dev, "replay timer timed out\n");
430
431 if (sub_reg & PCIE_CORE_INT_RTR)
432 dev_dbg(dev, "replay timer rolled over after 4 transmissions of the same TLP\n");
433
434 if (sub_reg & PCIE_CORE_INT_PE)
435 dev_dbg(dev, "phy error detected on receive side\n");
436
437 if (sub_reg & PCIE_CORE_INT_MTR)
438 dev_dbg(dev, "malformed TLP received from the link\n");
439
440 if (sub_reg & PCIE_CORE_INT_UCR)
441 dev_dbg(dev, "malformed TLP received from the link\n");
442
443 if (sub_reg & PCIE_CORE_INT_FCE)
444 dev_dbg(dev, "an error was observed in the flow control advertisements from the other side\n");
445
446 if (sub_reg & PCIE_CORE_INT_CT)
447 dev_dbg(dev, "a request timed out waiting for completion\n");
448
449 if (sub_reg & PCIE_CORE_INT_UTC)
450 dev_dbg(dev, "unmapped TC error\n");
451
452 if (sub_reg & PCIE_CORE_INT_MMVC)
453 dev_dbg(dev, "MSI mask register changes\n");
454
455 rockchip_pcie_write(rockchip, sub_reg, PCIE_CORE_INT_STATUS);
456 } else if (reg & PCIE_CLIENT_INT_PHY) {
457 dev_dbg(dev, "phy link changes\n");
458 rockchip_pcie_update_txcredit_mui(rockchip);
459 rockchip_pcie_clr_bw_int(rockchip);
460 }
461
462 rockchip_pcie_write(rockchip, reg & PCIE_CLIENT_INT_LOCAL,
463 PCIE_CLIENT_INT_STATUS);
464
465 return IRQ_HANDLED;
466}
467
468static irqreturn_t rockchip_pcie_client_irq_handler(int irq, void *arg)
469{
470 struct rockchip_pcie *rockchip = arg;
471 struct device *dev = rockchip->dev;
472 u32 reg;
473
474 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
475 if (reg & PCIE_CLIENT_INT_LEGACY_DONE)
476 dev_dbg(dev, "legacy done interrupt received\n");
477
478 if (reg & PCIE_CLIENT_INT_MSG)
479 dev_dbg(dev, "message done interrupt received\n");
480
481 if (reg & PCIE_CLIENT_INT_HOT_RST)
482 dev_dbg(dev, "hot reset interrupt received\n");
483
484 if (reg & PCIE_CLIENT_INT_DPA)
485 dev_dbg(dev, "dpa interrupt received\n");
486
487 if (reg & PCIE_CLIENT_INT_FATAL_ERR)
488 dev_dbg(dev, "fatal error interrupt received\n");
489
490 if (reg & PCIE_CLIENT_INT_NFATAL_ERR)
491 dev_dbg(dev, "no fatal error interrupt received\n");
492
493 if (reg & PCIE_CLIENT_INT_CORR_ERR)
494 dev_dbg(dev, "correctable error interrupt received\n");
495
496 if (reg & PCIE_CLIENT_INT_PHY)
497 dev_dbg(dev, "phy interrupt received\n");
498
499 rockchip_pcie_write(rockchip, reg & (PCIE_CLIENT_INT_LEGACY_DONE |
500 PCIE_CLIENT_INT_MSG | PCIE_CLIENT_INT_HOT_RST |
501 PCIE_CLIENT_INT_DPA | PCIE_CLIENT_INT_FATAL_ERR |
502 PCIE_CLIENT_INT_NFATAL_ERR |
503 PCIE_CLIENT_INT_CORR_ERR |
504 PCIE_CLIENT_INT_PHY),
505 PCIE_CLIENT_INT_STATUS);
506
507 return IRQ_HANDLED;
508}
509
510static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
511{
512 struct irq_chip *chip = irq_desc_get_chip(desc);
513 struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc);
514 struct device *dev = rockchip->dev;
515 u32 reg;
516 u32 hwirq;
517 int ret;
518
519 chained_irq_enter(chip, desc);
520
521 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
522 reg = (reg & PCIE_CLIENT_INTR_MASK) >> PCIE_CLIENT_INTR_SHIFT;
523
524 while (reg) {
525 hwirq = ffs(reg) - 1;
526 reg &= ~BIT(hwirq);
527
528 ret = generic_handle_domain_irq(rockchip->irq_domain, hwirq);
529 if (ret)
530 dev_err(dev, "unexpected IRQ, INT%d\n", hwirq);
531 }
532
533 chained_irq_exit(chip, desc);
534}
535
536static int rockchip_pcie_setup_irq(struct rockchip_pcie *rockchip)
537{
538 int irq, err;
539 struct device *dev = rockchip->dev;
540 struct platform_device *pdev = to_platform_device(dev);
541
542 irq = platform_get_irq_byname(pdev, "sys");
543 if (irq < 0)
544 return irq;
545
546 err = devm_request_irq(dev, irq, rockchip_pcie_subsys_irq_handler,
547 IRQF_SHARED, "pcie-sys", rockchip);
548 if (err) {
549 dev_err(dev, "failed to request PCIe subsystem IRQ\n");
550 return err;
551 }
552
553 irq = platform_get_irq_byname(pdev, "legacy");
554 if (irq < 0)
555 return irq;
556
557 irq_set_chained_handler_and_data(irq,
558 rockchip_pcie_legacy_int_handler,
559 rockchip);
560
561 irq = platform_get_irq_byname(pdev, "client");
562 if (irq < 0)
563 return irq;
564
565 err = devm_request_irq(dev, irq, rockchip_pcie_client_irq_handler,
566 IRQF_SHARED, "pcie-client", rockchip);
567 if (err) {
568 dev_err(dev, "failed to request PCIe client IRQ\n");
569 return err;
570 }
571
572 return 0;
573}
574
575/**
576 * rockchip_pcie_parse_host_dt - Parse Device Tree
577 * @rockchip: PCIe port information
578 *
579 * Return: '0' on success and error value on failure
580 */
581static int rockchip_pcie_parse_host_dt(struct rockchip_pcie *rockchip)
582{
583 struct device *dev = rockchip->dev;
584 int err;
585
586 err = rockchip_pcie_parse_dt(rockchip);
587 if (err)
588 return err;
589
590 rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v");
591 if (IS_ERR(rockchip->vpcie12v)) {
592 if (PTR_ERR(rockchip->vpcie12v) != -ENODEV)
593 return PTR_ERR(rockchip->vpcie12v);
594 dev_info(dev, "no vpcie12v regulator found\n");
595 }
596
597 rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
598 if (IS_ERR(rockchip->vpcie3v3)) {
599 if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
600 return PTR_ERR(rockchip->vpcie3v3);
601 dev_info(dev, "no vpcie3v3 regulator found\n");
602 }
603
604 rockchip->vpcie1v8 = devm_regulator_get(dev, "vpcie1v8");
605 if (IS_ERR(rockchip->vpcie1v8))
606 return PTR_ERR(rockchip->vpcie1v8);
607
608 rockchip->vpcie0v9 = devm_regulator_get(dev, "vpcie0v9");
609 if (IS_ERR(rockchip->vpcie0v9))
610 return PTR_ERR(rockchip->vpcie0v9);
611
612 return 0;
613}
614
615static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
616{
617 struct device *dev = rockchip->dev;
618 int err;
619
620 if (!IS_ERR(rockchip->vpcie12v)) {
621 err = regulator_enable(rockchip->vpcie12v);
622 if (err) {
623 dev_err(dev, "fail to enable vpcie12v regulator\n");
624 goto err_out;
625 }
626 }
627
628 if (!IS_ERR(rockchip->vpcie3v3)) {
629 err = regulator_enable(rockchip->vpcie3v3);
630 if (err) {
631 dev_err(dev, "fail to enable vpcie3v3 regulator\n");
632 goto err_disable_12v;
633 }
634 }
635
636 err = regulator_enable(rockchip->vpcie1v8);
637 if (err) {
638 dev_err(dev, "fail to enable vpcie1v8 regulator\n");
639 goto err_disable_3v3;
640 }
641
642 err = regulator_enable(rockchip->vpcie0v9);
643 if (err) {
644 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
645 goto err_disable_1v8;
646 }
647
648 return 0;
649
650err_disable_1v8:
651 regulator_disable(rockchip->vpcie1v8);
652err_disable_3v3:
653 if (!IS_ERR(rockchip->vpcie3v3))
654 regulator_disable(rockchip->vpcie3v3);
655err_disable_12v:
656 if (!IS_ERR(rockchip->vpcie12v))
657 regulator_disable(rockchip->vpcie12v);
658err_out:
659 return err;
660}
661
662static void rockchip_pcie_enable_interrupts(struct rockchip_pcie *rockchip)
663{
664 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) &
665 (~PCIE_CLIENT_INT_CLI), PCIE_CLIENT_INT_MASK);
666 rockchip_pcie_write(rockchip, (u32)(~PCIE_CORE_INT),
667 PCIE_CORE_INT_MASK);
668
669 rockchip_pcie_enable_bw_int(rockchip);
670}
671
672static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
673 irq_hw_number_t hwirq)
674{
675 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
676 irq_set_chip_data(irq, domain->host_data);
677
678 return 0;
679}
680
681static const struct irq_domain_ops intx_domain_ops = {
682 .map = rockchip_pcie_intx_map,
683};
684
685static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
686{
687 struct device *dev = rockchip->dev;
688 struct device_node *intc = of_get_next_child(dev->of_node, NULL);
689
690 if (!intc) {
691 dev_err(dev, "missing child interrupt-controller node\n");
692 return -EINVAL;
693 }
694
695 rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
696 &intx_domain_ops, rockchip);
697 of_node_put(intc);
698 if (!rockchip->irq_domain) {
699 dev_err(dev, "failed to get a INTx IRQ domain\n");
700 return -EINVAL;
701 }
702
703 return 0;
704}
705
706static int rockchip_pcie_prog_ob_atu(struct rockchip_pcie *rockchip,
707 int region_no, int type, u8 num_pass_bits,
708 u32 lower_addr, u32 upper_addr)
709{
710 u32 ob_addr_0;
711 u32 ob_addr_1;
712 u32 ob_desc_0;
713 u32 aw_offset;
714
715 if (region_no >= MAX_AXI_WRAPPER_REGION_NUM)
716 return -EINVAL;
717 if (num_pass_bits + 1 < 8)
718 return -EINVAL;
719 if (num_pass_bits > 63)
720 return -EINVAL;
721 if (region_no == 0) {
722 if (AXI_REGION_0_SIZE < (2ULL << num_pass_bits))
723 return -EINVAL;
724 }
725 if (region_no != 0) {
726 if (AXI_REGION_SIZE < (2ULL << num_pass_bits))
727 return -EINVAL;
728 }
729
730 aw_offset = (region_no << OB_REG_SIZE_SHIFT);
731
732 ob_addr_0 = num_pass_bits & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS;
733 ob_addr_0 |= lower_addr & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR;
734 ob_addr_1 = upper_addr;
735 ob_desc_0 = (1 << 23 | type);
736
737 rockchip_pcie_write(rockchip, ob_addr_0,
738 PCIE_CORE_OB_REGION_ADDR0 + aw_offset);
739 rockchip_pcie_write(rockchip, ob_addr_1,
740 PCIE_CORE_OB_REGION_ADDR1 + aw_offset);
741 rockchip_pcie_write(rockchip, ob_desc_0,
742 PCIE_CORE_OB_REGION_DESC0 + aw_offset);
743 rockchip_pcie_write(rockchip, 0,
744 PCIE_CORE_OB_REGION_DESC1 + aw_offset);
745
746 return 0;
747}
748
749static int rockchip_pcie_prog_ib_atu(struct rockchip_pcie *rockchip,
750 int region_no, u8 num_pass_bits,
751 u32 lower_addr, u32 upper_addr)
752{
753 u32 ib_addr_0;
754 u32 ib_addr_1;
755 u32 aw_offset;
756
757 if (region_no > MAX_AXI_IB_ROOTPORT_REGION_NUM)
758 return -EINVAL;
759 if (num_pass_bits + 1 < MIN_AXI_ADDR_BITS_PASSED)
760 return -EINVAL;
761 if (num_pass_bits > 63)
762 return -EINVAL;
763
764 aw_offset = (region_no << IB_ROOT_PORT_REG_SIZE_SHIFT);
765
766 ib_addr_0 = num_pass_bits & PCIE_CORE_IB_REGION_ADDR0_NUM_BITS;
767 ib_addr_0 |= (lower_addr << 8) & PCIE_CORE_IB_REGION_ADDR0_LO_ADDR;
768 ib_addr_1 = upper_addr;
769
770 rockchip_pcie_write(rockchip, ib_addr_0, PCIE_RP_IB_ADDR0 + aw_offset);
771 rockchip_pcie_write(rockchip, ib_addr_1, PCIE_RP_IB_ADDR1 + aw_offset);
772
773 return 0;
774}
775
776static int rockchip_pcie_cfg_atu(struct rockchip_pcie *rockchip)
777{
778 struct device *dev = rockchip->dev;
779 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rockchip);
780 struct resource_entry *entry;
781 u64 pci_addr, size;
782 int offset;
783 int err;
784 int reg_no;
785
786 rockchip_pcie_cfg_configuration_accesses(rockchip,
787 AXI_WRAPPER_TYPE0_CFG);
788 entry = resource_list_first_type(&bridge->windows, IORESOURCE_MEM);
789 if (!entry)
790 return -ENODEV;
791
792 size = resource_size(entry->res);
793 pci_addr = entry->res->start - entry->offset;
794 rockchip->msg_bus_addr = pci_addr;
795
796 for (reg_no = 0; reg_no < (size >> 20); reg_no++) {
797 err = rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1,
798 AXI_WRAPPER_MEM_WRITE,
799 20 - 1,
800 pci_addr + (reg_no << 20),
801 0);
802 if (err) {
803 dev_err(dev, "program RC mem outbound ATU failed\n");
804 return err;
805 }
806 }
807
808 err = rockchip_pcie_prog_ib_atu(rockchip, 2, 32 - 1, 0x0, 0);
809 if (err) {
810 dev_err(dev, "program RC mem inbound ATU failed\n");
811 return err;
812 }
813
814 entry = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
815 if (!entry)
816 return -ENODEV;
817
818 /* store the register number offset to program RC io outbound ATU */
819 offset = size >> 20;
820
821 size = resource_size(entry->res);
822 pci_addr = entry->res->start - entry->offset;
823
824 for (reg_no = 0; reg_no < (size >> 20); reg_no++) {
825 err = rockchip_pcie_prog_ob_atu(rockchip,
826 reg_no + 1 + offset,
827 AXI_WRAPPER_IO_WRITE,
828 20 - 1,
829 pci_addr + (reg_no << 20),
830 0);
831 if (err) {
832 dev_err(dev, "program RC io outbound ATU failed\n");
833 return err;
834 }
835 }
836
837 /* assign message regions */
838 rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1 + offset,
839 AXI_WRAPPER_NOR_MSG,
840 20 - 1, 0, 0);
841
842 rockchip->msg_bus_addr += ((reg_no + offset) << 20);
843 return err;
844}
845
846static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip)
847{
848 u32 value;
849 int err;
850
851 /* send PME_TURN_OFF message */
852 writel(0x0, rockchip->msg_region + PCIE_RC_SEND_PME_OFF);
853
854 /* read LTSSM and wait for falling into L2 link state */
855 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_DEBUG_OUT_0,
856 value, PCIE_LINK_IS_L2(value), 20,
857 jiffies_to_usecs(5 * HZ));
858 if (err) {
859 dev_err(rockchip->dev, "PCIe link enter L2 timeout!\n");
860 return err;
861 }
862
863 return 0;
864}
865
866static int rockchip_pcie_suspend_noirq(struct device *dev)
867{
868 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
869 int ret;
870
871 /* disable core and cli int since we don't need to ack PME_ACK */
872 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
873 PCIE_CLIENT_INT_CLI, PCIE_CLIENT_INT_MASK);
874 rockchip_pcie_write(rockchip, (u32)PCIE_CORE_INT, PCIE_CORE_INT_MASK);
875
876 ret = rockchip_pcie_wait_l2(rockchip);
877 if (ret) {
878 rockchip_pcie_enable_interrupts(rockchip);
879 return ret;
880 }
881
882 rockchip_pcie_deinit_phys(rockchip);
883
884 rockchip_pcie_disable_clocks(rockchip);
885
886 regulator_disable(rockchip->vpcie0v9);
887
888 return ret;
889}
890
891static int rockchip_pcie_resume_noirq(struct device *dev)
892{
893 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
894 int err;
895
896 err = regulator_enable(rockchip->vpcie0v9);
897 if (err) {
898 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
899 return err;
900 }
901
902 err = rockchip_pcie_enable_clocks(rockchip);
903 if (err)
904 goto err_disable_0v9;
905
906 err = rockchip_pcie_host_init_port(rockchip);
907 if (err)
908 goto err_pcie_resume;
909
910 err = rockchip_pcie_cfg_atu(rockchip);
911 if (err)
912 goto err_err_deinit_port;
913
914 /* Need this to enter L1 again */
915 rockchip_pcie_update_txcredit_mui(rockchip);
916 rockchip_pcie_enable_interrupts(rockchip);
917
918 return 0;
919
920err_err_deinit_port:
921 rockchip_pcie_deinit_phys(rockchip);
922err_pcie_resume:
923 rockchip_pcie_disable_clocks(rockchip);
924err_disable_0v9:
925 regulator_disable(rockchip->vpcie0v9);
926 return err;
927}
928
929static int rockchip_pcie_probe(struct platform_device *pdev)
930{
931 struct rockchip_pcie *rockchip;
932 struct device *dev = &pdev->dev;
933 struct pci_host_bridge *bridge;
934 int err;
935
936 if (!dev->of_node)
937 return -ENODEV;
938
939 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rockchip));
940 if (!bridge)
941 return -ENOMEM;
942
943 rockchip = pci_host_bridge_priv(bridge);
944
945 platform_set_drvdata(pdev, rockchip);
946 rockchip->dev = dev;
947 rockchip->is_rc = true;
948
949 err = rockchip_pcie_parse_host_dt(rockchip);
950 if (err)
951 return err;
952
953 err = rockchip_pcie_enable_clocks(rockchip);
954 if (err)
955 return err;
956
957 err = rockchip_pcie_set_vpcie(rockchip);
958 if (err) {
959 dev_err(dev, "failed to set vpcie regulator\n");
960 goto err_set_vpcie;
961 }
962
963 err = rockchip_pcie_host_init_port(rockchip);
964 if (err)
965 goto err_vpcie;
966
967 err = rockchip_pcie_init_irq_domain(rockchip);
968 if (err < 0)
969 goto err_deinit_port;
970
971 err = rockchip_pcie_cfg_atu(rockchip);
972 if (err)
973 goto err_remove_irq_domain;
974
975 rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M);
976 if (!rockchip->msg_region) {
977 err = -ENOMEM;
978 goto err_remove_irq_domain;
979 }
980
981 bridge->sysdata = rockchip;
982 bridge->ops = &rockchip_pcie_ops;
983
984 err = rockchip_pcie_setup_irq(rockchip);
985 if (err)
986 goto err_remove_irq_domain;
987
988 rockchip_pcie_enable_interrupts(rockchip);
989
990 err = pci_host_probe(bridge);
991 if (err < 0)
992 goto err_remove_irq_domain;
993
994 return 0;
995
996err_remove_irq_domain:
997 irq_domain_remove(rockchip->irq_domain);
998err_deinit_port:
999 rockchip_pcie_deinit_phys(rockchip);
1000err_vpcie:
1001 if (!IS_ERR(rockchip->vpcie12v))
1002 regulator_disable(rockchip->vpcie12v);
1003 if (!IS_ERR(rockchip->vpcie3v3))
1004 regulator_disable(rockchip->vpcie3v3);
1005 regulator_disable(rockchip->vpcie1v8);
1006 regulator_disable(rockchip->vpcie0v9);
1007err_set_vpcie:
1008 rockchip_pcie_disable_clocks(rockchip);
1009 return err;
1010}
1011
1012static int rockchip_pcie_remove(struct platform_device *pdev)
1013{
1014 struct device *dev = &pdev->dev;
1015 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
1016 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rockchip);
1017
1018 pci_stop_root_bus(bridge->bus);
1019 pci_remove_root_bus(bridge->bus);
1020 irq_domain_remove(rockchip->irq_domain);
1021
1022 rockchip_pcie_deinit_phys(rockchip);
1023
1024 rockchip_pcie_disable_clocks(rockchip);
1025
1026 if (!IS_ERR(rockchip->vpcie12v))
1027 regulator_disable(rockchip->vpcie12v);
1028 if (!IS_ERR(rockchip->vpcie3v3))
1029 regulator_disable(rockchip->vpcie3v3);
1030 regulator_disable(rockchip->vpcie1v8);
1031 regulator_disable(rockchip->vpcie0v9);
1032
1033 return 0;
1034}
1035
1036static const struct dev_pm_ops rockchip_pcie_pm_ops = {
1037 NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq,
1038 rockchip_pcie_resume_noirq)
1039};
1040
1041static const struct of_device_id rockchip_pcie_of_match[] = {
1042 { .compatible = "rockchip,rk3399-pcie", },
1043 {}
1044};
1045MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match);
1046
1047static struct platform_driver rockchip_pcie_driver = {
1048 .driver = {
1049 .name = "rockchip-pcie",
1050 .of_match_table = rockchip_pcie_of_match,
1051 .pm = &rockchip_pcie_pm_ops,
1052 },
1053 .probe = rockchip_pcie_probe,
1054 .remove = rockchip_pcie_remove,
1055};
1056module_platform_driver(rockchip_pcie_driver);
1057
1058MODULE_AUTHOR("Rockchip Inc");
1059MODULE_DESCRIPTION("Rockchip AXI PCIe driver");
1060MODULE_LICENSE("GPL v2");