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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / pci / controller / dwc / pci-keystone.c
blobc8c702c494a2da14a1f044bd1504cea9a3fede60
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * PCIe host controller driver for Texas Instruments Keystone SoCs
4 *
5 * Copyright (C) 2013-2014 Texas Instruments., Ltd.
6 * http://www.ti.com
7 *
8 * Author: Murali Karicheri <m-karicheri2@ti.com>
9 * Implementation based on pci-exynos.c and pcie-designware.c
10 */
11
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/gpio/consumer.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/irqchip/chained_irq.h>
18 #include <linux/irqdomain.h>
19 #include <linux/mfd/syscon.h>
20 #include <linux/msi.h>
21 #include <linux/of.h>
22 #include <linux/of_device.h>
23 #include <linux/of_irq.h>
24 #include <linux/of_pci.h>
25 #include <linux/phy/phy.h>
26 #include <linux/platform_device.h>
27 #include <linux/regmap.h>
28 #include <linux/resource.h>
29 #include <linux/signal.h>
30
31 #include "../../pci.h"
32 #include "pcie-designware.h"
33
34 #define PCIE_VENDORID_MASK 0xffff
35 #define PCIE_DEVICEID_SHIFT 16
36
37 /* Application registers */
38 #define CMD_STATUS 0x004
39 #define LTSSM_EN_VAL BIT(0)
40 #define OB_XLAT_EN_VAL BIT(1)
41 #define DBI_CS2 BIT(5)
42
43 #define CFG_SETUP 0x008
44 #define CFG_BUS(x) (((x) & 0xff) << 16)
45 #define CFG_DEVICE(x) (((x) & 0x1f) << 8)
46 #define CFG_FUNC(x) ((x) & 0x7)
47 #define CFG_TYPE1 BIT(24)
48
49 #define OB_SIZE 0x030
50 #define OB_OFFSET_INDEX(n) (0x200 + (8 * (n)))
51 #define OB_OFFSET_HI(n) (0x204 + (8 * (n)))
52 #define OB_ENABLEN BIT(0)
53 #define OB_WIN_SIZE 8 /* 8MB */
54
55 #define PCIE_LEGACY_IRQ_ENABLE_SET(n) (0x188 + (0x10 * ((n) - 1)))
56 #define PCIE_LEGACY_IRQ_ENABLE_CLR(n) (0x18c + (0x10 * ((n) - 1)))
57 #define PCIE_EP_IRQ_SET 0x64
58 #define PCIE_EP_IRQ_CLR 0x68
59 #define INT_ENABLE BIT(0)
60
61 /* IRQ register defines */
62 #define IRQ_EOI 0x050
63
64 #define MSI_IRQ 0x054
65 #define MSI_IRQ_STATUS(n) (0x104 + ((n) << 4))
66 #define MSI_IRQ_ENABLE_SET(n) (0x108 + ((n) << 4))
67 #define MSI_IRQ_ENABLE_CLR(n) (0x10c + ((n) << 4))
68 #define MSI_IRQ_OFFSET 4
69
70 #define IRQ_STATUS(n) (0x184 + ((n) << 4))
71 #define IRQ_ENABLE_SET(n) (0x188 + ((n) << 4))
72 #define INTx_EN BIT(0)
73
74 #define ERR_IRQ_STATUS 0x1c4
75 #define ERR_IRQ_ENABLE_SET 0x1c8
76 #define ERR_AER BIT(5) /* ECRC error */
77 #define AM6_ERR_AER BIT(4) /* AM6 ECRC error */
78 #define ERR_AXI BIT(4) /* AXI tag lookup fatal error */
79 #define ERR_CORR BIT(3) /* Correctable error */
80 #define ERR_NONFATAL BIT(2) /* Non-fatal error */
81 #define ERR_FATAL BIT(1) /* Fatal error */
82 #define ERR_SYS BIT(0) /* System error */
83 #define ERR_IRQ_ALL (ERR_AER | ERR_AXI | ERR_CORR | \
84 ERR_NONFATAL | ERR_FATAL | ERR_SYS)
85
86 /* PCIE controller device IDs */
87 #define PCIE_RC_K2HK 0xb008
88 #define PCIE_RC_K2E 0xb009
89 #define PCIE_RC_K2L 0xb00a
90 #define PCIE_RC_K2G 0xb00b
91
92 #define KS_PCIE_DEV_TYPE_MASK (0x3 << 1)
93 #define KS_PCIE_DEV_TYPE(mode) ((mode) << 1)
94
95 #define EP 0x0
96 #define LEG_EP 0x1
97 #define RC 0x2
98
99 #define EXP_CAP_ID_OFFSET 0x70
100
101 #define KS_PCIE_SYSCLOCKOUTEN BIT(0)
102
103 #define AM654_PCIE_DEV_TYPE_MASK 0x3
104 #define AM654_WIN_SIZE SZ_64K
105
106 #define APP_ADDR_SPACE_0 (16 * SZ_1K)
107
108 #define to_keystone_pcie(x) dev_get_drvdata((x)->dev)
109
110 struct ks_pcie_of_data {
111 enum dw_pcie_device_mode mode;
112 const struct dw_pcie_host_ops *host_ops;
113 const struct dw_pcie_ep_ops *ep_ops;
114 unsigned int version;
115 };
116
117 struct keystone_pcie {
118 struct dw_pcie *pci;
119 /* PCI Device ID */
120 u32 device_id;
121 int legacy_host_irqs[PCI_NUM_INTX];
122 struct device_node *legacy_intc_np;
123
124 int msi_host_irq;
125 int num_lanes;
126 u32 num_viewport;
127 struct phy **phy;
128 struct device_link **link;
129 struct device_node *msi_intc_np;
130 struct irq_domain *legacy_irq_domain;
131 struct device_node *np;
132
133 /* Application register space */
134 void __iomem *va_app_base; /* DT 1st resource */
135 struct resource app;
136 bool is_am6;
137 };
138
139 static u32 ks_pcie_app_readl(struct keystone_pcie *ks_pcie, u32 offset)
140 {
141 return readl(ks_pcie->va_app_base + offset);
142 }
143
144 static void ks_pcie_app_writel(struct keystone_pcie *ks_pcie, u32 offset,
145 u32 val)
146 {
147 writel(val, ks_pcie->va_app_base + offset);
148 }
149
150 static void ks_pcie_msi_irq_ack(struct irq_data *data)
151 {
152 struct pcie_port *pp = irq_data_get_irq_chip_data(data);
153 struct keystone_pcie *ks_pcie;
154 u32 irq = data->hwirq;
155 struct dw_pcie *pci;
156 u32 reg_offset;
157 u32 bit_pos;
158
159 pci = to_dw_pcie_from_pp(pp);
160 ks_pcie = to_keystone_pcie(pci);
161
162 reg_offset = irq % 8;
163 bit_pos = irq >> 3;
164
165 ks_pcie_app_writel(ks_pcie, MSI_IRQ_STATUS(reg_offset),
166 BIT(bit_pos));
167 ks_pcie_app_writel(ks_pcie, IRQ_EOI, reg_offset + MSI_IRQ_OFFSET);
168 }
169
170 static void ks_pcie_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
171 {
172 struct pcie_port *pp = irq_data_get_irq_chip_data(data);
173 struct keystone_pcie *ks_pcie;
174 struct dw_pcie *pci;
175 u64 msi_target;
176
177 pci = to_dw_pcie_from_pp(pp);
178 ks_pcie = to_keystone_pcie(pci);
179
180 msi_target = ks_pcie->app.start + MSI_IRQ;
181 msg->address_lo = lower_32_bits(msi_target);
182 msg->address_hi = upper_32_bits(msi_target);
183 msg->data = data->hwirq;
184
185 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
186 (int)data->hwirq, msg->address_hi, msg->address_lo);
187 }
188
189 static int ks_pcie_msi_set_affinity(struct irq_data *irq_data,
190 const struct cpumask *mask, bool force)
191 {
192 return -EINVAL;
193 }
194
195 static void ks_pcie_msi_mask(struct irq_data *data)
196 {
197 struct pcie_port *pp = irq_data_get_irq_chip_data(data);
198 struct keystone_pcie *ks_pcie;
199 u32 irq = data->hwirq;
200 struct dw_pcie *pci;
201 unsigned long flags;
202 u32 reg_offset;
203 u32 bit_pos;
204
205 raw_spin_lock_irqsave(&pp->lock, flags);
206
207 pci = to_dw_pcie_from_pp(pp);
208 ks_pcie = to_keystone_pcie(pci);
209
210 reg_offset = irq % 8;
211 bit_pos = irq >> 3;
212
213 ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_CLR(reg_offset),
214 BIT(bit_pos));
215
216 raw_spin_unlock_irqrestore(&pp->lock, flags);
217 }
218
219 static void ks_pcie_msi_unmask(struct irq_data *data)
220 {
221 struct pcie_port *pp = irq_data_get_irq_chip_data(data);
222 struct keystone_pcie *ks_pcie;
223 u32 irq = data->hwirq;
224 struct dw_pcie *pci;
225 unsigned long flags;
226 u32 reg_offset;
227 u32 bit_pos;
228
229 raw_spin_lock_irqsave(&pp->lock, flags);
230
231 pci = to_dw_pcie_from_pp(pp);
232 ks_pcie = to_keystone_pcie(pci);
233
234 reg_offset = irq % 8;
235 bit_pos = irq >> 3;
236
237 ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_SET(reg_offset),
238 BIT(bit_pos));
239
240 raw_spin_unlock_irqrestore(&pp->lock, flags);
241 }
242
243 static struct irq_chip ks_pcie_msi_irq_chip = {
244 .name = "KEYSTONE-PCI-MSI",
245 .irq_ack = ks_pcie_msi_irq_ack,
246 .irq_compose_msi_msg = ks_pcie_compose_msi_msg,
247 .irq_set_affinity = ks_pcie_msi_set_affinity,
248 .irq_mask = ks_pcie_msi_mask,
249 .irq_unmask = ks_pcie_msi_unmask,
250 };
251
252 static int ks_pcie_msi_host_init(struct pcie_port *pp)
253 {
254 pp->msi_irq_chip = &ks_pcie_msi_irq_chip;
255 return dw_pcie_allocate_domains(pp);
256 }
257
258 static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
259 int offset)
260 {
261 struct dw_pcie *pci = ks_pcie->pci;
262 struct device *dev = pci->dev;
263 u32 pending;
264 int virq;
265
266 pending = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(offset));
267
268 if (BIT(0) & pending) {
269 virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
270 dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", offset, virq);
271 generic_handle_irq(virq);
272 }
273
274 /* EOI the INTx interrupt */
275 ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset);
276 }
277
278 /*
279 * Dummy function so that DW core doesn't configure MSI
280 */
281 static int ks_pcie_am654_msi_host_init(struct pcie_port *pp)
282 {
283 return 0;
284 }
285
286 static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
287 {
288 ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
289 }
290
291 static irqreturn_t ks_pcie_handle_error_irq(struct keystone_pcie *ks_pcie)
292 {
293 u32 reg;
294 struct device *dev = ks_pcie->pci->dev;
295
296 reg = ks_pcie_app_readl(ks_pcie, ERR_IRQ_STATUS);
297 if (!reg)
298 return IRQ_NONE;
299
300 if (reg & ERR_SYS)
301 dev_err(dev, "System Error\n");
302
303 if (reg & ERR_FATAL)
304 dev_err(dev, "Fatal Error\n");
305
306 if (reg & ERR_NONFATAL)
307 dev_dbg(dev, "Non Fatal Error\n");
308
309 if (reg & ERR_CORR)
310 dev_dbg(dev, "Correctable Error\n");
311
312 if (!ks_pcie->is_am6 && (reg & ERR_AXI))
313 dev_err(dev, "AXI tag lookup fatal Error\n");
314
315 if (reg & ERR_AER || (ks_pcie->is_am6 && (reg & AM6_ERR_AER)))
316 dev_err(dev, "ECRC Error\n");
317
318 ks_pcie_app_writel(ks_pcie, ERR_IRQ_STATUS, reg);
319
320 return IRQ_HANDLED;
321 }
322
323 static void ks_pcie_ack_legacy_irq(struct irq_data *d)
324 {
325 }
326
327 static void ks_pcie_mask_legacy_irq(struct irq_data *d)
328 {
329 }
330
331 static void ks_pcie_unmask_legacy_irq(struct irq_data *d)
332 {
333 }
334
335 static struct irq_chip ks_pcie_legacy_irq_chip = {
336 .name = "Keystone-PCI-Legacy-IRQ",
337 .irq_ack = ks_pcie_ack_legacy_irq,
338 .irq_mask = ks_pcie_mask_legacy_irq,
339 .irq_unmask = ks_pcie_unmask_legacy_irq,
340 };
341
342 static int ks_pcie_init_legacy_irq_map(struct irq_domain *d,
343 unsigned int irq,
344 irq_hw_number_t hw_irq)
345 {
346 irq_set_chip_and_handler(irq, &ks_pcie_legacy_irq_chip,
347 handle_level_irq);
348 irq_set_chip_data(irq, d->host_data);
349
350 return 0;
351 }
352
353 static const struct irq_domain_ops ks_pcie_legacy_irq_domain_ops = {
354 .map = ks_pcie_init_legacy_irq_map,
355 .xlate = irq_domain_xlate_onetwocell,
356 };
357
358 /**
359 * ks_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask
360 * registers
361 *
362 * Since modification of dbi_cs2 involves different clock domain, read the
363 * status back to ensure the transition is complete.
364 */
365 static void ks_pcie_set_dbi_mode(struct keystone_pcie *ks_pcie)
366 {
367 u32 val;
368
369 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
370 val |= DBI_CS2;
371 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
372
373 do {
374 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
375 } while (!(val & DBI_CS2));
376 }
377
378 /**
379 * ks_pcie_clear_dbi_mode() - Disable DBI mode
380 *
381 * Since modification of dbi_cs2 involves different clock domain, read the
382 * status back to ensure the transition is complete.
383 */
384 static void ks_pcie_clear_dbi_mode(struct keystone_pcie *ks_pcie)
385 {
386 u32 val;
387
388 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
389 val &= ~DBI_CS2;
390 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
391
392 do {
393 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
394 } while (val & DBI_CS2);
395 }
396
397 static void ks_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
398 {
399 u32 val;
400 u32 num_viewport = ks_pcie->num_viewport;
401 struct dw_pcie *pci = ks_pcie->pci;
402 struct pcie_port *pp = &pci->pp;
403 u64 start = pp->mem->start;
404 u64 end = pp->mem->end;
405 int i;
406
407 /* Disable BARs for inbound access */
408 ks_pcie_set_dbi_mode(ks_pcie);
409 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
410 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0);
411 ks_pcie_clear_dbi_mode(ks_pcie);
412
413 if (ks_pcie->is_am6)
414 return;
415
416 val = ilog2(OB_WIN_SIZE);
417 ks_pcie_app_writel(ks_pcie, OB_SIZE, val);
418
419 /* Using Direct 1:1 mapping of RC <-> PCI memory space */
420 for (i = 0; i < num_viewport && (start < end); i++) {
421 ks_pcie_app_writel(ks_pcie, OB_OFFSET_INDEX(i),
422 lower_32_bits(start) | OB_ENABLEN);
423 ks_pcie_app_writel(ks_pcie, OB_OFFSET_HI(i),
424 upper_32_bits(start));
425 start += OB_WIN_SIZE * SZ_1M;
426 }
427
428 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
429 val |= OB_XLAT_EN_VAL;
430 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
431 }
432
433 static int ks_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
434 unsigned int devfn, int where, int size,
435 u32 *val)
436 {
437 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
438 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
439 u32 reg;
440
441 reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
442 CFG_FUNC(PCI_FUNC(devfn));
443 if (bus->parent->number != pp->root_bus_nr)
444 reg |= CFG_TYPE1;
445 ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);
446
447 return dw_pcie_read(pp->va_cfg0_base + where, size, val);
448 }
449
450 static int ks_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
451 unsigned int devfn, int where, int size,
452 u32 val)
453 {
454 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
455 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
456 u32 reg;
457
458 reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
459 CFG_FUNC(PCI_FUNC(devfn));
460 if (bus->parent->number != pp->root_bus_nr)
461 reg |= CFG_TYPE1;
462 ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);
463
464 return dw_pcie_write(pp->va_cfg0_base + where, size, val);
465 }
466
467 /**
468 * ks_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
469 *
470 * This sets BAR0 to enable inbound access for MSI_IRQ register
471 */
472 static void ks_pcie_v3_65_scan_bus(struct pcie_port *pp)
473 {
474 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
475 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
476
477 /* Configure and set up BAR0 */
478 ks_pcie_set_dbi_mode(ks_pcie);
479
480 /* Enable BAR0 */
481 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 1);
482 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, SZ_4K - 1);
483
484 ks_pcie_clear_dbi_mode(ks_pcie);
485
486 /*
487 * For BAR0, just setting bus address for inbound writes (MSI) should
488 * be sufficient. Use physical address to avoid any conflicts.
489 */
490 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
491 }
492
493 /**
494 * ks_pcie_link_up() - Check if link up
495 */
496 static int ks_pcie_link_up(struct dw_pcie *pci)
497 {
498 u32 val;
499
500 val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0);
501 val &= PORT_LOGIC_LTSSM_STATE_MASK;
502 return (val == PORT_LOGIC_LTSSM_STATE_L0);
503 }
504
505 static void ks_pcie_stop_link(struct dw_pcie *pci)
506 {
507 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
508 u32 val;
509
510 /* Disable Link training */
511 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
512 val &= ~LTSSM_EN_VAL;
513 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
514 }
515
516 static int ks_pcie_start_link(struct dw_pcie *pci)
517 {
518 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
519 struct device *dev = pci->dev;
520 u32 val;
521
522 if (dw_pcie_link_up(pci)) {
523 dev_dbg(dev, "link is already up\n");
524 return 0;
525 }
526
527 /* Initiate Link Training */
528 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
529 ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
530
531 return 0;
532 }
533
534 static void ks_pcie_quirk(struct pci_dev *dev)
535 {
536 struct pci_bus *bus = dev->bus;
537 struct pci_dev *bridge;
538 static const struct pci_device_id rc_pci_devids[] = {
539 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2HK),
540 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
541 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2E),
542 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
543 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2L),
544 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
545 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2G),
546 .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, },
547 { 0, },
548 };
549
550 if (pci_is_root_bus(bus))
551 bridge = dev;
552
553 /* look for the host bridge */
554 while (!pci_is_root_bus(bus)) {
555 bridge = bus->self;
556 bus = bus->parent;
557 }
558
559 if (!bridge)
560 return;
561
562 /*
563 * Keystone PCI controller has a h/w limitation of
564 * 256 bytes maximum read request size. It can't handle
565 * anything higher than this. So force this limit on
566 * all downstream devices.
567 */
568 if (pci_match_id(rc_pci_devids, bridge)) {
569 if (pcie_get_readrq(dev) > 256) {
570 dev_info(&dev->dev, "limiting MRRS to 256\n");
571 pcie_set_readrq(dev, 256);
572 }
573 }
574 }
575 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, ks_pcie_quirk);
576
577 static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
578 {
579 unsigned int irq = desc->irq_data.hwirq;
580 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
581 u32 offset = irq - ks_pcie->msi_host_irq;
582 struct dw_pcie *pci = ks_pcie->pci;
583 struct pcie_port *pp = &pci->pp;
584 struct device *dev = pci->dev;
585 struct irq_chip *chip = irq_desc_get_chip(desc);
586 u32 vector, virq, reg, pos;
587
588 dev_dbg(dev, "%s, irq %d\n", __func__, irq);
589
590 /*
591 * The chained irq handler installation would have replaced normal
592 * interrupt driver handler so we need to take care of mask/unmask and
593 * ack operation.
594 */
595 chained_irq_enter(chip, desc);
596
597 reg = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset));
598 /*
599 * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
600 * shows 1, 9, 17, 25 and so forth
601 */
602 for (pos = 0; pos < 4; pos++) {
603 if (!(reg & BIT(pos)))
604 continue;
605
606 vector = offset + (pos << 3);
607 virq = irq_linear_revmap(pp->irq_domain, vector);
608 dev_dbg(dev, "irq: bit %d, vector %d, virq %d\n", pos, vector,
609 virq);
610 generic_handle_irq(virq);
611 }
612
613 chained_irq_exit(chip, desc);
614 }
615
616 /**
617 * ks_pcie_legacy_irq_handler() - Handle legacy interrupt
618 * @irq: IRQ line for legacy interrupts
619 * @desc: Pointer to irq descriptor
620 *
621 * Traverse through pending legacy interrupts and invoke handler for each. Also
622 * takes care of interrupt controller level mask/ack operation.
623 */
624 static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
625 {
626 unsigned int irq = irq_desc_get_irq(desc);
627 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
628 struct dw_pcie *pci = ks_pcie->pci;
629 struct device *dev = pci->dev;
630 u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0];
631 struct irq_chip *chip = irq_desc_get_chip(desc);
632
633 dev_dbg(dev, ": Handling legacy irq %d\n", irq);
634
635 /*
636 * The chained irq handler installation would have replaced normal
637 * interrupt driver handler so we need to take care of mask/unmask and
638 * ack operation.
639 */
640 chained_irq_enter(chip, desc);
641 ks_pcie_handle_legacy_irq(ks_pcie, irq_offset);
642 chained_irq_exit(chip, desc);
643 }
644
645 static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie)
646 {
647 struct device *dev = ks_pcie->pci->dev;
648 struct device_node *np = ks_pcie->np;
649 struct device_node *intc_np;
650 struct irq_data *irq_data;
651 int irq_count, irq, ret, i;
652
653 if (!IS_ENABLED(CONFIG_PCI_MSI))
654 return 0;
655
656 intc_np = of_get_child_by_name(np, "msi-interrupt-controller");
657 if (!intc_np) {
658 if (ks_pcie->is_am6)
659 return 0;
660 dev_warn(dev, "msi-interrupt-controller node is absent\n");
661 return -EINVAL;
662 }
663
664 irq_count = of_irq_count(intc_np);
665 if (!irq_count) {
666 dev_err(dev, "No IRQ entries in msi-interrupt-controller\n");
667 ret = -EINVAL;
668 goto err;
669 }
670
671 for (i = 0; i < irq_count; i++) {
672 irq = irq_of_parse_and_map(intc_np, i);
673 if (!irq) {
674 ret = -EINVAL;
675 goto err;
676 }
677
678 if (!ks_pcie->msi_host_irq) {
679 irq_data = irq_get_irq_data(irq);
680 if (!irq_data) {
681 ret = -EINVAL;
682 goto err;
683 }
684 ks_pcie->msi_host_irq = irq_data->hwirq;
685 }
686
687 irq_set_chained_handler_and_data(irq, ks_pcie_msi_irq_handler,
688 ks_pcie);
689 }
690
691 of_node_put(intc_np);
692 return 0;
693
694 err:
695 of_node_put(intc_np);
696 return ret;
697 }
698
699 static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie)
700 {
701 struct device *dev = ks_pcie->pci->dev;
702 struct irq_domain *legacy_irq_domain;
703 struct device_node *np = ks_pcie->np;
704 struct device_node *intc_np;
705 int irq_count, irq, ret = 0, i;
706
707 intc_np = of_get_child_by_name(np, "legacy-interrupt-controller");
708 if (!intc_np) {
709 /*
710 * Since legacy interrupts are modeled as edge-interrupts in
711 * AM6, keep it disabled for now.
712 */
713 if (ks_pcie->is_am6)
714 return 0;
715 dev_warn(dev, "legacy-interrupt-controller node is absent\n");
716 return -EINVAL;
717 }
718
719 irq_count = of_irq_count(intc_np);
720 if (!irq_count) {
721 dev_err(dev, "No IRQ entries in legacy-interrupt-controller\n");
722 ret = -EINVAL;
723 goto err;
724 }
725
726 for (i = 0; i < irq_count; i++) {
727 irq = irq_of_parse_and_map(intc_np, i);
728 if (!irq) {
729 ret = -EINVAL;
730 goto err;
731 }
732 ks_pcie->legacy_host_irqs[i] = irq;
733
734 irq_set_chained_handler_and_data(irq,
735 ks_pcie_legacy_irq_handler,
736 ks_pcie);
737 }
738
739 legacy_irq_domain =
740 irq_domain_add_linear(intc_np, PCI_NUM_INTX,
741 &ks_pcie_legacy_irq_domain_ops, NULL);
742 if (!legacy_irq_domain) {
743 dev_err(dev, "Failed to add irq domain for legacy irqs\n");
744 ret = -EINVAL;
745 goto err;
746 }
747 ks_pcie->legacy_irq_domain = legacy_irq_domain;
748
749 for (i = 0; i < PCI_NUM_INTX; i++)
750 ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(i), INTx_EN);
751
752 err:
753 of_node_put(intc_np);
754 return ret;
755 }
756
757 #ifdef CONFIG_ARM
758 /*
759 * When a PCI device does not exist during config cycles, keystone host gets a
760 * bus error instead of returning 0xffffffff. This handler always returns 0
761 * for this kind of faults.
762 */
763 static int ks_pcie_fault(unsigned long addr, unsigned int fsr,
764 struct pt_regs *regs)
765 {
766 unsigned long instr = *(unsigned long *) instruction_pointer(regs);
767
768 if ((instr & 0x0e100090) == 0x00100090) {
769 int reg = (instr >> 12) & 15;
770
771 regs->uregs[reg] = -1;
772 regs->ARM_pc += 4;
773 }
774
775 return 0;
776 }
777 #endif
778
779 static int __init ks_pcie_init_id(struct keystone_pcie *ks_pcie)
780 {
781 int ret;
782 unsigned int id;
783 struct regmap *devctrl_regs;
784 struct dw_pcie *pci = ks_pcie->pci;
785 struct device *dev = pci->dev;
786 struct device_node *np = dev->of_node;
787
788 devctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-id");
789 if (IS_ERR(devctrl_regs))
790 return PTR_ERR(devctrl_regs);
791
792 ret = regmap_read(devctrl_regs, 0, &id);
793 if (ret)
794 return ret;
795
796 dw_pcie_dbi_ro_wr_en(pci);
797 dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, id & PCIE_VENDORID_MASK);
798 dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, id >> PCIE_DEVICEID_SHIFT);
799 dw_pcie_dbi_ro_wr_dis(pci);
800
801 return 0;
802 }
803
804 static int __init ks_pcie_host_init(struct pcie_port *pp)
805 {
806 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
807 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
808 int ret;
809
810 ret = ks_pcie_config_legacy_irq(ks_pcie);
811 if (ret)
812 return ret;
813
814 ret = ks_pcie_config_msi_irq(ks_pcie);
815 if (ret)
816 return ret;
817
818 dw_pcie_setup_rc(pp);
819
820 ks_pcie_stop_link(pci);
821 ks_pcie_setup_rc_app_regs(ks_pcie);
822 writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
823 pci->dbi_base + PCI_IO_BASE);
824
825 ret = ks_pcie_init_id(ks_pcie);
826 if (ret < 0)
827 return ret;
828
829 #ifdef CONFIG_ARM
830 /*
831 * PCIe access errors that result into OCP errors are caught by ARM as
832 * "External aborts"
833 */
834 hook_fault_code(17, ks_pcie_fault, SIGBUS, 0,
835 "Asynchronous external abort");
836 #endif
837
838 ks_pcie_start_link(pci);
839 dw_pcie_wait_for_link(pci);
840
841 return 0;
842 }
843
844 static const struct dw_pcie_host_ops ks_pcie_host_ops = {
845 .rd_other_conf = ks_pcie_rd_other_conf,
846 .wr_other_conf = ks_pcie_wr_other_conf,
847 .host_init = ks_pcie_host_init,
848 .msi_host_init = ks_pcie_msi_host_init,
849 .scan_bus = ks_pcie_v3_65_scan_bus,
850 };
851
852 static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = {
853 .host_init = ks_pcie_host_init,
854 .msi_host_init = ks_pcie_am654_msi_host_init,
855 };
856
857 static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv)
858 {
859 struct keystone_pcie *ks_pcie = priv;
860
861 return ks_pcie_handle_error_irq(ks_pcie);
862 }
863
864 static int __init ks_pcie_add_pcie_port(struct keystone_pcie *ks_pcie,
865 struct platform_device *pdev)
866 {
867 struct dw_pcie *pci = ks_pcie->pci;
868 struct pcie_port *pp = &pci->pp;
869 struct device *dev = &pdev->dev;
870 struct resource *res;
871 int ret;
872
873 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
874 pp->va_cfg0_base = devm_pci_remap_cfg_resource(dev, res);
875 if (IS_ERR(pp->va_cfg0_base))
876 return PTR_ERR(pp->va_cfg0_base);
877
878 pp->va_cfg1_base = pp->va_cfg0_base;
879
880 ret = dw_pcie_host_init(pp);
881 if (ret) {
882 dev_err(dev, "failed to initialize host\n");
883 return ret;
884 }
885
886 return 0;
887 }
888
889 static u32 ks_pcie_am654_read_dbi2(struct dw_pcie *pci, void __iomem *base,
890 u32 reg, size_t size)
891 {
892 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
893 u32 val;
894
895 ks_pcie_set_dbi_mode(ks_pcie);
896 dw_pcie_read(base + reg, size, &val);
897 ks_pcie_clear_dbi_mode(ks_pcie);
898 return val;
899 }
900
901 static void ks_pcie_am654_write_dbi2(struct dw_pcie *pci, void __iomem *base,
902 u32 reg, size_t size, u32 val)
903 {
904 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
905
906 ks_pcie_set_dbi_mode(ks_pcie);
907 dw_pcie_write(base + reg, size, val);
908 ks_pcie_clear_dbi_mode(ks_pcie);
909 }
910
911 static const struct dw_pcie_ops ks_pcie_dw_pcie_ops = {
912 .start_link = ks_pcie_start_link,
913 .stop_link = ks_pcie_stop_link,
914 .link_up = ks_pcie_link_up,
915 .read_dbi2 = ks_pcie_am654_read_dbi2,
916 .write_dbi2 = ks_pcie_am654_write_dbi2,
917 };
918
919 static void ks_pcie_am654_ep_init(struct dw_pcie_ep *ep)
920 {
921 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
922 int flags;
923
924 ep->page_size = AM654_WIN_SIZE;
925 flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32;
926 dw_pcie_writel_dbi2(pci, PCI_BASE_ADDRESS_0, APP_ADDR_SPACE_0 - 1);
927 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, flags);
928 }
929
930 static void ks_pcie_am654_raise_legacy_irq(struct keystone_pcie *ks_pcie)
931 {
932 struct dw_pcie *pci = ks_pcie->pci;
933 u8 int_pin;
934
935 int_pin = dw_pcie_readb_dbi(pci, PCI_INTERRUPT_PIN);
936 if (int_pin == 0 || int_pin > 4)
937 return;
938
939 ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_SET(int_pin),
940 INT_ENABLE);
941 ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_SET, INT_ENABLE);
942 mdelay(1);
943 ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_CLR, INT_ENABLE);
944 ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_CLR(int_pin),
945 INT_ENABLE);
946 }
947
948 static int ks_pcie_am654_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
949 enum pci_epc_irq_type type,
950 u16 interrupt_num)
951 {
952 struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
953 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
954
955 switch (type) {
956 case PCI_EPC_IRQ_LEGACY:
957 ks_pcie_am654_raise_legacy_irq(ks_pcie);
958 break;
959 case PCI_EPC_IRQ_MSI:
960 dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
961 break;
962 default:
963 dev_err(pci->dev, "UNKNOWN IRQ type\n");
964 return -EINVAL;
965 }
966
967 return 0;
968 }
969
970 static const struct pci_epc_features ks_pcie_am654_epc_features = {
971 .linkup_notifier = false,
972 .msi_capable = true,
973 .msix_capable = false,
974 .reserved_bar = 1 << BAR_0 | 1 << BAR_1,
975 .bar_fixed_64bit = 1 << BAR_0,
976 .bar_fixed_size[2] = SZ_1M,
977 .bar_fixed_size[3] = SZ_64K,
978 .bar_fixed_size[4] = 256,
979 .bar_fixed_size[5] = SZ_1M,
980 .align = SZ_1M,
981 };
982
983 static const struct pci_epc_features*
984 ks_pcie_am654_get_features(struct dw_pcie_ep *ep)
985 {
986 return &ks_pcie_am654_epc_features;
987 }
988
989 static const struct dw_pcie_ep_ops ks_pcie_am654_ep_ops = {
990 .ep_init = ks_pcie_am654_ep_init,
991 .raise_irq = ks_pcie_am654_raise_irq,
992 .get_features = &ks_pcie_am654_get_features,
993 };
994
995 static int __init ks_pcie_add_pcie_ep(struct keystone_pcie *ks_pcie,
996 struct platform_device *pdev)
997 {
998 int ret;
999 struct dw_pcie_ep *ep;
1000 struct resource *res;
1001 struct device *dev = &pdev->dev;
1002 struct dw_pcie *pci = ks_pcie->pci;
1003
1004 ep = &pci->ep;
1005
1006 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
1007 if (!res)
1008 return -EINVAL;
1009
1010 ep->phys_base = res->start;
1011 ep->addr_size = resource_size(res);
1012
1013 ret = dw_pcie_ep_init(ep);
1014 if (ret) {
1015 dev_err(dev, "failed to initialize endpoint\n");
1016 return ret;
1017 }
1018
1019 return 0;
1020 }
1021
1022 static void ks_pcie_disable_phy(struct keystone_pcie *ks_pcie)
1023 {
1024 int num_lanes = ks_pcie->num_lanes;
1025
1026 while (num_lanes--) {
1027 phy_power_off(ks_pcie->phy[num_lanes]);
1028 phy_exit(ks_pcie->phy[num_lanes]);
1029 }
1030 }
1031
1032 static int ks_pcie_enable_phy(struct keystone_pcie *ks_pcie)
1033 {
1034 int i;
1035 int ret;
1036 int num_lanes = ks_pcie->num_lanes;
1037
1038 for (i = 0; i < num_lanes; i++) {
1039 ret = phy_reset(ks_pcie->phy[i]);
1040 if (ret < 0)
1041 goto err_phy;
1042
1043 ret = phy_init(ks_pcie->phy[i]);
1044 if (ret < 0)
1045 goto err_phy;
1046
1047 ret = phy_power_on(ks_pcie->phy[i]);
1048 if (ret < 0) {
1049 phy_exit(ks_pcie->phy[i]);
1050 goto err_phy;
1051 }
1052 }
1053
1054 return 0;
1055
1056 err_phy:
1057 while (--i >= 0) {
1058 phy_power_off(ks_pcie->phy[i]);
1059 phy_exit(ks_pcie->phy[i]);
1060 }
1061
1062 return ret;
1063 }
1064
1065 static int ks_pcie_set_mode(struct device *dev)
1066 {
1067 struct device_node *np = dev->of_node;
1068 struct regmap *syscon;
1069 u32 val;
1070 u32 mask;
1071 int ret = 0;
1072
1073 syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
1074 if (IS_ERR(syscon))
1075 return 0;
1076
1077 mask = KS_PCIE_DEV_TYPE_MASK | KS_PCIE_SYSCLOCKOUTEN;
1078 val = KS_PCIE_DEV_TYPE(RC) | KS_PCIE_SYSCLOCKOUTEN;
1079
1080 ret = regmap_update_bits(syscon, 0, mask, val);
1081 if (ret) {
1082 dev_err(dev, "failed to set pcie mode\n");
1083 return ret;
1084 }
1085
1086 return 0;
1087 }
1088
1089 static int ks_pcie_am654_set_mode(struct device *dev,
1090 enum dw_pcie_device_mode mode)
1091 {
1092 struct device_node *np = dev->of_node;
1093 struct regmap *syscon;
1094 u32 val;
1095 u32 mask;
1096 int ret = 0;
1097
1098 syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode");
1099 if (IS_ERR(syscon))
1100 return 0;
1101
1102 mask = AM654_PCIE_DEV_TYPE_MASK;
1103
1104 switch (mode) {
1105 case DW_PCIE_RC_TYPE:
1106 val = RC;
1107 break;
1108 case DW_PCIE_EP_TYPE:
1109 val = EP;
1110 break;
1111 default:
1112 dev_err(dev, "INVALID device type %d\n", mode);
1113 return -EINVAL;
1114 }
1115
1116 ret = regmap_update_bits(syscon, 0, mask, val);
1117 if (ret) {
1118 dev_err(dev, "failed to set pcie mode\n");
1119 return ret;
1120 }
1121
1122 return 0;
1123 }
1124
1125 static void ks_pcie_set_link_speed(struct dw_pcie *pci, int link_speed)
1126 {
1127 u32 val;
1128
1129 dw_pcie_dbi_ro_wr_en(pci);
1130
1131 val = dw_pcie_readl_dbi(pci, EXP_CAP_ID_OFFSET + PCI_EXP_LNKCAP);
1132 if ((val & PCI_EXP_LNKCAP_SLS) != link_speed) {
1133 val &= ~((u32)PCI_EXP_LNKCAP_SLS);
1134 val |= link_speed;
1135 dw_pcie_writel_dbi(pci, EXP_CAP_ID_OFFSET + PCI_EXP_LNKCAP,
1136 val);
1137 }
1138
1139 val = dw_pcie_readl_dbi(pci, EXP_CAP_ID_OFFSET + PCI_EXP_LNKCTL2);
1140 if ((val & PCI_EXP_LNKCAP_SLS) != link_speed) {
1141 val &= ~((u32)PCI_EXP_LNKCAP_SLS);
1142 val |= link_speed;
1143 dw_pcie_writel_dbi(pci, EXP_CAP_ID_OFFSET + PCI_EXP_LNKCTL2,
1144 val);
1145 }
1146
1147 dw_pcie_dbi_ro_wr_dis(pci);
1148 }
1149
1150 static const struct ks_pcie_of_data ks_pcie_rc_of_data = {
1151 .host_ops = &ks_pcie_host_ops,
1152 .version = 0x365A,
1153 };
1154
1155 static const struct ks_pcie_of_data ks_pcie_am654_rc_of_data = {
1156 .host_ops = &ks_pcie_am654_host_ops,
1157 .mode = DW_PCIE_RC_TYPE,
1158 .version = 0x490A,
1159 };
1160
1161 static const struct ks_pcie_of_data ks_pcie_am654_ep_of_data = {
1162 .ep_ops = &ks_pcie_am654_ep_ops,
1163 .mode = DW_PCIE_EP_TYPE,
1164 .version = 0x490A,
1165 };
1166
1167 static const struct of_device_id ks_pcie_of_match[] = {
1168 {
1169 .type = "pci",
1170 .data = &ks_pcie_rc_of_data,
1171 .compatible = "ti,keystone-pcie",
1172 },
1173 {
1174 .data = &ks_pcie_am654_rc_of_data,
1175 .compatible = "ti,am654-pcie-rc",
1176 },
1177 {
1178 .data = &ks_pcie_am654_ep_of_data,
1179 .compatible = "ti,am654-pcie-ep",
1180 },
1181 { },
1182 };
1183
1184 static int __init ks_pcie_probe(struct platform_device *pdev)
1185 {
1186 const struct dw_pcie_host_ops *host_ops;
1187 const struct dw_pcie_ep_ops *ep_ops;
1188 struct device *dev = &pdev->dev;
1189 struct device_node *np = dev->of_node;
1190 const struct ks_pcie_of_data *data;
1191 const struct of_device_id *match;
1192 enum dw_pcie_device_mode mode;
1193 struct dw_pcie *pci;
1194 struct keystone_pcie *ks_pcie;
1195 struct device_link **link;
1196 struct gpio_desc *gpiod;
1197 void __iomem *atu_base;
1198 struct resource *res;
1199 unsigned int version;
1200 void __iomem *base;
1201 u32 num_viewport;
1202 struct phy **phy;
1203 int link_speed;
1204 u32 num_lanes;
1205 char name[10];
1206 int ret;
1207 int irq;
1208 int i;
1209
1210 match = of_match_device(of_match_ptr(ks_pcie_of_match), dev);
1211 data = (struct ks_pcie_of_data *)match->data;
1212 if (!data)
1213 return -EINVAL;
1214
1215 version = data->version;
1216 host_ops = data->host_ops;
1217 ep_ops = data->ep_ops;
1218 mode = data->mode;
1219
1220 ks_pcie = devm_kzalloc(dev, sizeof(*ks_pcie), GFP_KERNEL);
1221 if (!ks_pcie)
1222 return -ENOMEM;
1223
1224 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
1225 if (!pci)
1226 return -ENOMEM;
1227
1228 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app");
1229 ks_pcie->va_app_base = devm_ioremap_resource(dev, res);
1230 if (IS_ERR(ks_pcie->va_app_base))
1231 return PTR_ERR(ks_pcie->va_app_base);
1232
1233 ks_pcie->app = *res;
1234
1235 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbics");
1236 base = devm_pci_remap_cfg_resource(dev, res);
1237 if (IS_ERR(base))
1238 return PTR_ERR(base);
1239
1240 if (of_device_is_compatible(np, "ti,am654-pcie-rc"))
1241 ks_pcie->is_am6 = true;
1242
1243 pci->dbi_base = base;
1244 pci->dbi_base2 = base;
1245 pci->dev = dev;
1246 pci->ops = &ks_pcie_dw_pcie_ops;
1247 pci->version = version;
1248
1249 irq = platform_get_irq(pdev, 0);
1250 if (irq < 0) {
1251 dev_err(dev, "missing IRQ resource: %d\n", irq);
1252 return irq;
1253 }
1254
1255 ret = request_irq(irq, ks_pcie_err_irq_handler, IRQF_SHARED,
1256 "ks-pcie-error-irq", ks_pcie);
1257 if (ret < 0) {
1258 dev_err(dev, "failed to request error IRQ %d\n",
1259 irq);
1260 return ret;
1261 }
1262
1263 ret = of_property_read_u32(np, "num-lanes", &num_lanes);
1264 if (ret)
1265 num_lanes = 1;
1266
1267 phy = devm_kzalloc(dev, sizeof(*phy) * num_lanes, GFP_KERNEL);
1268 if (!phy)
1269 return -ENOMEM;
1270
1271 link = devm_kzalloc(dev, sizeof(*link) * num_lanes, GFP_KERNEL);
1272 if (!link)
1273 return -ENOMEM;
1274
1275 for (i = 0; i < num_lanes; i++) {
1276 snprintf(name, sizeof(name), "pcie-phy%d", i);
1277 phy[i] = devm_phy_optional_get(dev, name);
1278 if (IS_ERR(phy[i])) {
1279 ret = PTR_ERR(phy[i]);
1280 goto err_link;
1281 }
1282
1283 if (!phy[i])
1284 continue;
1285
1286 link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
1287 if (!link[i]) {
1288 ret = -EINVAL;
1289 goto err_link;
1290 }
1291 }
1292
1293 ks_pcie->np = np;
1294 ks_pcie->pci = pci;
1295 ks_pcie->link = link;
1296 ks_pcie->num_lanes = num_lanes;
1297 ks_pcie->phy = phy;
1298
1299 gpiod = devm_gpiod_get_optional(dev, "reset",
1300 GPIOD_OUT_LOW);
1301 if (IS_ERR(gpiod)) {
1302 ret = PTR_ERR(gpiod);
1303 if (ret != -EPROBE_DEFER)
1304 dev_err(dev, "Failed to get reset GPIO\n");
1305 goto err_link;
1306 }
1307
1308 ret = ks_pcie_enable_phy(ks_pcie);
1309 if (ret) {
1310 dev_err(dev, "failed to enable phy\n");
1311 goto err_link;
1312 }
1313
1314 platform_set_drvdata(pdev, ks_pcie);
1315 pm_runtime_enable(dev);
1316 ret = pm_runtime_get_sync(dev);
1317 if (ret < 0) {
1318 dev_err(dev, "pm_runtime_get_sync failed\n");
1319 goto err_get_sync;
1320 }
1321
1322 if (pci->version >= 0x480A) {
1323 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
1324 atu_base = devm_ioremap_resource(dev, res);
1325 if (IS_ERR(atu_base)) {
1326 ret = PTR_ERR(atu_base);
1327 goto err_get_sync;
1328 }
1329
1330 pci->atu_base = atu_base;
1331
1332 ret = ks_pcie_am654_set_mode(dev, mode);
1333 if (ret < 0)
1334 goto err_get_sync;
1335 } else {
1336 ret = ks_pcie_set_mode(dev);
1337 if (ret < 0)
1338 goto err_get_sync;
1339 }
1340
1341 link_speed = of_pci_get_max_link_speed(np);
1342 if (link_speed < 0)
1343 link_speed = 2;
1344
1345 ks_pcie_set_link_speed(pci, link_speed);
1346
1347 switch (mode) {
1348 case DW_PCIE_RC_TYPE:
1349 if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_HOST)) {
1350 ret = -ENODEV;
1351 goto err_get_sync;
1352 }
1353
1354 ret = of_property_read_u32(np, "num-viewport", &num_viewport);
1355 if (ret < 0) {
1356 dev_err(dev, "unable to read *num-viewport* property\n");
1357 goto err_get_sync;
1358 }
1359
1360 /*
1361 * "Power Sequencing and Reset Signal Timings" table in
1362 * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 2.0
1363 * indicates PERST# should be deasserted after minimum of 100us
1364 * once REFCLK is stable. The REFCLK to the connector in RC
1365 * mode is selected while enabling the PHY. So deassert PERST#
1366 * after 100 us.
1367 */
1368 if (gpiod) {
1369 usleep_range(100, 200);
1370 gpiod_set_value_cansleep(gpiod, 1);
1371 }
1372
1373 ks_pcie->num_viewport = num_viewport;
1374 pci->pp.ops = host_ops;
1375 ret = ks_pcie_add_pcie_port(ks_pcie, pdev);
1376 if (ret < 0)
1377 goto err_get_sync;
1378 break;
1379 case DW_PCIE_EP_TYPE:
1380 if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_EP)) {
1381 ret = -ENODEV;
1382 goto err_get_sync;
1383 }
1384
1385 pci->ep.ops = ep_ops;
1386 ret = ks_pcie_add_pcie_ep(ks_pcie, pdev);
1387 if (ret < 0)
1388 goto err_get_sync;
1389 break;
1390 default:
1391 dev_err(dev, "INVALID device type %d\n", mode);
1392 }
1393
1394 ks_pcie_enable_error_irq(ks_pcie);
1395
1396 return 0;
1397
1398 err_get_sync:
1399 pm_runtime_put(dev);
1400 pm_runtime_disable(dev);
1401 ks_pcie_disable_phy(ks_pcie);
1402
1403 err_link:
1404 while (--i >= 0 && link[i])
1405 device_link_del(link[i]);
1406
1407 return ret;
1408 }
1409
1410 static int __exit ks_pcie_remove(struct platform_device *pdev)
1411 {
1412 struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
1413 struct device_link **link = ks_pcie->link;
1414 int num_lanes = ks_pcie->num_lanes;
1415 struct device *dev = &pdev->dev;
1416
1417 pm_runtime_put(dev);
1418 pm_runtime_disable(dev);
1419 ks_pcie_disable_phy(ks_pcie);
1420 while (num_lanes--)
1421 device_link_del(link[num_lanes]);
1422
1423 return 0;
1424 }
1425
1426 static struct platform_driver ks_pcie_driver __refdata = {
1427 .probe = ks_pcie_probe,
1428 .remove = __exit_p(ks_pcie_remove),
1429 .driver = {
1430 .name = "keystone-pcie",
1431 .of_match_table = of_match_ptr(ks_pcie_of_match),
1432 },
1433 };
1434 builtin_platform_driver(ks_pcie_driver);
Linux with added FPC-III support