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dm writecache: add cond_resched to loop in persistent_memory_claim()
[linux/fpc-iii.git] / drivers / pci / controller / pcie-rockchip-host.c
blob94af6f5828a3dd2885b5f9ba6372d7637b8490bc
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
42 static 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
51 static 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
60 static 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
71 static 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
88 static 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
106 static 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
131 static 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
159 static 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
193 static 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
223 static 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
240 static 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
255 static struct pci_ops rockchip_pcie_ops = {
256 .read = rockchip_pcie_rd_conf,
257 .write = rockchip_pcie_wr_conf,
258 };
259
260 static 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 */
300 static 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;
400 err_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
409 static 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
475 static 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
517 static 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
545 static 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 */
596 static 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(dev, "vpcie1v8");
624 if (IS_ERR(rockchip->vpcie1v8))
625 return PTR_ERR(rockchip->vpcie1v8);
626
627 rockchip->vpcie0v9 = devm_regulator_get(dev, "vpcie0v9");
628 if (IS_ERR(rockchip->vpcie0v9))
629 return PTR_ERR(rockchip->vpcie0v9);
630
631 return 0;
632 }
633
634 static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
635 {
636 struct device *dev = rockchip->dev;
637 int err;
638
639 if (!IS_ERR(rockchip->vpcie12v)) {
640 err = regulator_enable(rockchip->vpcie12v);
641 if (err) {
642 dev_err(dev, "fail to enable vpcie12v regulator\n");
643 goto err_out;
644 }
645 }
646
647 if (!IS_ERR(rockchip->vpcie3v3)) {
648 err = regulator_enable(rockchip->vpcie3v3);
649 if (err) {
650 dev_err(dev, "fail to enable vpcie3v3 regulator\n");
651 goto err_disable_12v;
652 }
653 }
654
655 err = regulator_enable(rockchip->vpcie1v8);
656 if (err) {
657 dev_err(dev, "fail to enable vpcie1v8 regulator\n");
658 goto err_disable_3v3;
659 }
660
661 err = regulator_enable(rockchip->vpcie0v9);
662 if (err) {
663 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
664 goto err_disable_1v8;
665 }
666
667 return 0;
668
669 err_disable_1v8:
670 regulator_disable(rockchip->vpcie1v8);
671 err_disable_3v3:
672 if (!IS_ERR(rockchip->vpcie3v3))
673 regulator_disable(rockchip->vpcie3v3);
674 err_disable_12v:
675 if (!IS_ERR(rockchip->vpcie12v))
676 regulator_disable(rockchip->vpcie12v);
677 err_out:
678 return err;
679 }
680
681 static void rockchip_pcie_enable_interrupts(struct rockchip_pcie *rockchip)
682 {
683 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) &
684 (~PCIE_CLIENT_INT_CLI), PCIE_CLIENT_INT_MASK);
685 rockchip_pcie_write(rockchip, (u32)(~PCIE_CORE_INT),
686 PCIE_CORE_INT_MASK);
687
688 rockchip_pcie_enable_bw_int(rockchip);
689 }
690
691 static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
692 irq_hw_number_t hwirq)
693 {
694 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
695 irq_set_chip_data(irq, domain->host_data);
696
697 return 0;
698 }
699
700 static const struct irq_domain_ops intx_domain_ops = {
701 .map = rockchip_pcie_intx_map,
702 };
703
704 static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
705 {
706 struct device *dev = rockchip->dev;
707 struct device_node *intc = of_get_next_child(dev->of_node, NULL);
708
709 if (!intc) {
710 dev_err(dev, "missing child interrupt-controller node\n");
711 return -EINVAL;
712 }
713
714 rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
715 &intx_domain_ops, rockchip);
716 of_node_put(intc);
717 if (!rockchip->irq_domain) {
718 dev_err(dev, "failed to get a INTx IRQ domain\n");
719 return -EINVAL;
720 }
721
722 return 0;
723 }
724
725 static int rockchip_pcie_prog_ob_atu(struct rockchip_pcie *rockchip,
726 int region_no, int type, u8 num_pass_bits,
727 u32 lower_addr, u32 upper_addr)
728 {
729 u32 ob_addr_0;
730 u32 ob_addr_1;
731 u32 ob_desc_0;
732 u32 aw_offset;
733
734 if (region_no >= MAX_AXI_WRAPPER_REGION_NUM)
735 return -EINVAL;
736 if (num_pass_bits + 1 < 8)
737 return -EINVAL;
738 if (num_pass_bits > 63)
739 return -EINVAL;
740 if (region_no == 0) {
741 if (AXI_REGION_0_SIZE < (2ULL << num_pass_bits))
742 return -EINVAL;
743 }
744 if (region_no != 0) {
745 if (AXI_REGION_SIZE < (2ULL << num_pass_bits))
746 return -EINVAL;
747 }
748
749 aw_offset = (region_no << OB_REG_SIZE_SHIFT);
750
751 ob_addr_0 = num_pass_bits & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS;
752 ob_addr_0 |= lower_addr & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR;
753 ob_addr_1 = upper_addr;
754 ob_desc_0 = (1 << 23 | type);
755
756 rockchip_pcie_write(rockchip, ob_addr_0,
757 PCIE_CORE_OB_REGION_ADDR0 + aw_offset);
758 rockchip_pcie_write(rockchip, ob_addr_1,
759 PCIE_CORE_OB_REGION_ADDR1 + aw_offset);
760 rockchip_pcie_write(rockchip, ob_desc_0,
761 PCIE_CORE_OB_REGION_DESC0 + aw_offset);
762 rockchip_pcie_write(rockchip, 0,
763 PCIE_CORE_OB_REGION_DESC1 + aw_offset);
764
765 return 0;
766 }
767
768 static int rockchip_pcie_prog_ib_atu(struct rockchip_pcie *rockchip,
769 int region_no, u8 num_pass_bits,
770 u32 lower_addr, u32 upper_addr)
771 {
772 u32 ib_addr_0;
773 u32 ib_addr_1;
774 u32 aw_offset;
775
776 if (region_no > MAX_AXI_IB_ROOTPORT_REGION_NUM)
777 return -EINVAL;
778 if (num_pass_bits + 1 < MIN_AXI_ADDR_BITS_PASSED)
779 return -EINVAL;
780 if (num_pass_bits > 63)
781 return -EINVAL;
782
783 aw_offset = (region_no << IB_ROOT_PORT_REG_SIZE_SHIFT);
784
785 ib_addr_0 = num_pass_bits & PCIE_CORE_IB_REGION_ADDR0_NUM_BITS;
786 ib_addr_0 |= (lower_addr << 8) & PCIE_CORE_IB_REGION_ADDR0_LO_ADDR;
787 ib_addr_1 = upper_addr;
788
789 rockchip_pcie_write(rockchip, ib_addr_0, PCIE_RP_IB_ADDR0 + aw_offset);
790 rockchip_pcie_write(rockchip, ib_addr_1, PCIE_RP_IB_ADDR1 + aw_offset);
791
792 return 0;
793 }
794
795 static int rockchip_pcie_cfg_atu(struct rockchip_pcie *rockchip)
796 {
797 struct device *dev = rockchip->dev;
798 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rockchip);
799 struct resource_entry *entry;
800 u64 pci_addr, size;
801 int offset;
802 int err;
803 int reg_no;
804
805 rockchip_pcie_cfg_configuration_accesses(rockchip,
806 AXI_WRAPPER_TYPE0_CFG);
807 entry = resource_list_first_type(&bridge->windows, IORESOURCE_MEM);
808 if (!entry)
809 return -ENODEV;
810
811 size = resource_size(entry->res);
812 pci_addr = entry->res->start - entry->offset;
813 rockchip->msg_bus_addr = pci_addr;
814
815 for (reg_no = 0; reg_no < (size >> 20); reg_no++) {
816 err = rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1,
817 AXI_WRAPPER_MEM_WRITE,
818 20 - 1,
819 pci_addr + (reg_no << 20),
820 0);
821 if (err) {
822 dev_err(dev, "program RC mem outbound ATU failed\n");
823 return err;
824 }
825 }
826
827 err = rockchip_pcie_prog_ib_atu(rockchip, 2, 32 - 1, 0x0, 0);
828 if (err) {
829 dev_err(dev, "program RC mem inbound ATU failed\n");
830 return err;
831 }
832
833 entry = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
834 if (!entry)
835 return -ENODEV;
836
837 /* store the register number offset to program RC io outbound ATU */
838 offset = size >> 20;
839
840 size = resource_size(entry->res);
841 pci_addr = entry->res->start - entry->offset;
842
843 for (reg_no = 0; reg_no < (size >> 20); reg_no++) {
844 err = rockchip_pcie_prog_ob_atu(rockchip,
845 reg_no + 1 + offset,
846 AXI_WRAPPER_IO_WRITE,
847 20 - 1,
848 pci_addr + (reg_no << 20),
849 0);
850 if (err) {
851 dev_err(dev, "program RC io outbound ATU failed\n");
852 return err;
853 }
854 }
855
856 /* assign message regions */
857 rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1 + offset,
858 AXI_WRAPPER_NOR_MSG,
859 20 - 1, 0, 0);
860
861 rockchip->msg_bus_addr += ((reg_no + offset) << 20);
862 return err;
863 }
864
865 static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip)
866 {
867 u32 value;
868 int err;
869
870 /* send PME_TURN_OFF message */
871 writel(0x0, rockchip->msg_region + PCIE_RC_SEND_PME_OFF);
872
873 /* read LTSSM and wait for falling into L2 link state */
874 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_DEBUG_OUT_0,
875 value, PCIE_LINK_IS_L2(value), 20,
876 jiffies_to_usecs(5 * HZ));
877 if (err) {
878 dev_err(rockchip->dev, "PCIe link enter L2 timeout!\n");
879 return err;
880 }
881
882 return 0;
883 }
884
885 static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
886 {
887 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
888 int ret;
889
890 /* disable core and cli int since we don't need to ack PME_ACK */
891 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
892 PCIE_CLIENT_INT_CLI, PCIE_CLIENT_INT_MASK);
893 rockchip_pcie_write(rockchip, (u32)PCIE_CORE_INT, PCIE_CORE_INT_MASK);
894
895 ret = rockchip_pcie_wait_l2(rockchip);
896 if (ret) {
897 rockchip_pcie_enable_interrupts(rockchip);
898 return ret;
899 }
900
901 rockchip_pcie_deinit_phys(rockchip);
902
903 rockchip_pcie_disable_clocks(rockchip);
904
905 regulator_disable(rockchip->vpcie0v9);
906
907 return ret;
908 }
909
910 static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev)
911 {
912 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
913 int err;
914
915 err = regulator_enable(rockchip->vpcie0v9);
916 if (err) {
917 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
918 return err;
919 }
920
921 err = rockchip_pcie_enable_clocks(rockchip);
922 if (err)
923 goto err_disable_0v9;
924
925 err = rockchip_pcie_host_init_port(rockchip);
926 if (err)
927 goto err_pcie_resume;
928
929 err = rockchip_pcie_cfg_atu(rockchip);
930 if (err)
931 goto err_err_deinit_port;
932
933 /* Need this to enter L1 again */
934 rockchip_pcie_update_txcredit_mui(rockchip);
935 rockchip_pcie_enable_interrupts(rockchip);
936
937 return 0;
938
939 err_err_deinit_port:
940 rockchip_pcie_deinit_phys(rockchip);
941 err_pcie_resume:
942 rockchip_pcie_disable_clocks(rockchip);
943 err_disable_0v9:
944 regulator_disable(rockchip->vpcie0v9);
945 return err;
946 }
947
948 static int rockchip_pcie_probe(struct platform_device *pdev)
949 {
950 struct rockchip_pcie *rockchip;
951 struct device *dev = &pdev->dev;
952 struct pci_bus *bus, *child;
953 struct pci_host_bridge *bridge;
954 struct resource *bus_res;
955 int err;
956
957 if (!dev->of_node)
958 return -ENODEV;
959
960 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rockchip));
961 if (!bridge)
962 return -ENOMEM;
963
964 rockchip = pci_host_bridge_priv(bridge);
965
966 platform_set_drvdata(pdev, rockchip);
967 rockchip->dev = dev;
968 rockchip->is_rc = true;
969
970 err = rockchip_pcie_parse_host_dt(rockchip);
971 if (err)
972 return err;
973
974 err = rockchip_pcie_enable_clocks(rockchip);
975 if (err)
976 return err;
977
978 err = rockchip_pcie_set_vpcie(rockchip);
979 if (err) {
980 dev_err(dev, "failed to set vpcie regulator\n");
981 goto err_set_vpcie;
982 }
983
984 err = rockchip_pcie_host_init_port(rockchip);
985 if (err)
986 goto err_vpcie;
987
988 rockchip_pcie_enable_interrupts(rockchip);
989
990 err = rockchip_pcie_init_irq_domain(rockchip);
991 if (err < 0)
992 goto err_deinit_port;
993
994 err = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
995 &bridge->dma_ranges, &bus_res);
996 if (err)
997 goto err_remove_irq_domain;
998
999 rockchip->root_bus_nr = bus_res->start;
1000
1001 err = rockchip_pcie_cfg_atu(rockchip);
1002 if (err)
1003 goto err_remove_irq_domain;
1004
1005 rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M);
1006 if (!rockchip->msg_region) {
1007 err = -ENOMEM;
1008 goto err_remove_irq_domain;
1009 }
1010
1011 bridge->dev.parent = dev;
1012 bridge->sysdata = rockchip;
1013 bridge->busnr = 0;
1014 bridge->ops = &rockchip_pcie_ops;
1015 bridge->map_irq = of_irq_parse_and_map_pci;
1016 bridge->swizzle_irq = pci_common_swizzle;
1017
1018 err = pci_scan_root_bus_bridge(bridge);
1019 if (err < 0)
1020 goto err_remove_irq_domain;
1021
1022 bus = bridge->bus;
1023
1024 rockchip->root_bus = bus;
1025
1026 pci_bus_size_bridges(bus);
1027 pci_bus_assign_resources(bus);
1028 list_for_each_entry(child, &bus->children, node)
1029 pcie_bus_configure_settings(child);
1030
1031 pci_bus_add_devices(bus);
1032 return 0;
1033
1034 err_remove_irq_domain:
1035 irq_domain_remove(rockchip->irq_domain);
1036 err_deinit_port:
1037 rockchip_pcie_deinit_phys(rockchip);
1038 err_vpcie:
1039 if (!IS_ERR(rockchip->vpcie12v))
1040 regulator_disable(rockchip->vpcie12v);
1041 if (!IS_ERR(rockchip->vpcie3v3))
1042 regulator_disable(rockchip->vpcie3v3);
1043 regulator_disable(rockchip->vpcie1v8);
1044 regulator_disable(rockchip->vpcie0v9);
1045 err_set_vpcie:
1046 rockchip_pcie_disable_clocks(rockchip);
1047 return err;
1048 }
1049
1050 static int rockchip_pcie_remove(struct platform_device *pdev)
1051 {
1052 struct device *dev = &pdev->dev;
1053 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
1054
1055 pci_stop_root_bus(rockchip->root_bus);
1056 pci_remove_root_bus(rockchip->root_bus);
1057 irq_domain_remove(rockchip->irq_domain);
1058
1059 rockchip_pcie_deinit_phys(rockchip);
1060
1061 rockchip_pcie_disable_clocks(rockchip);
1062
1063 if (!IS_ERR(rockchip->vpcie12v))
1064 regulator_disable(rockchip->vpcie12v);
1065 if (!IS_ERR(rockchip->vpcie3v3))
1066 regulator_disable(rockchip->vpcie3v3);
1067 regulator_disable(rockchip->vpcie1v8);
1068 regulator_disable(rockchip->vpcie0v9);
1069
1070 return 0;
1071 }
1072
1073 static const struct dev_pm_ops rockchip_pcie_pm_ops = {
1074 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq,
1075 rockchip_pcie_resume_noirq)
1076 };
1077
1078 static const struct of_device_id rockchip_pcie_of_match[] = {
1079 { .compatible = "rockchip,rk3399-pcie", },
1080 {}
1081 };
1082 MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match);
1083
1084 static struct platform_driver rockchip_pcie_driver = {
1085 .driver = {
1086 .name = "rockchip-pcie",
1087 .of_match_table = rockchip_pcie_of_match,
1088 .pm = &rockchip_pcie_pm_ops,
1089 },
1090 .probe = rockchip_pcie_probe,
1091 .remove = rockchip_pcie_remove,
1092 };
1093 module_platform_driver(rockchip_pcie_driver);
1094
1095 MODULE_AUTHOR("Rockchip Inc");
1096 MODULE_DESCRIPTION("Rockchip AXI PCIe driver");
1097 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support