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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * PCIe driver for Renesas R-Car SoCs
4 * Copyright (C) 2014-2020 Renesas Electronics Europe Ltd
5 *
6 * Based on:
7 * arch/sh/drivers/pci/pcie-sh7786.c
8 * arch/sh/drivers/pci/ops-sh7786.c
9 * Copyright (C) 2009 - 2011 Paul Mundt
10 *
11 * Author: Phil Edworthy <phil.edworthy@renesas.com>
12 */
13
14#include <linux/bitops.h>
15#include <linux/clk.h>
16#include <linux/clk-provider.h>
17#include <linux/delay.h>
18#include <linux/interrupt.h>
19#include <linux/irq.h>
20#include <linux/irqdomain.h>
21#include <linux/kernel.h>
22#include <linux/init.h>
23#include <linux/iopoll.h>
24#include <linux/msi.h>
25#include <linux/of_address.h>
26#include <linux/of_irq.h>
27#include <linux/of_platform.h>
28#include <linux/pci.h>
29#include <linux/phy/phy.h>
30#include <linux/platform_device.h>
31#include <linux/pm_runtime.h>
32#include <linux/regulator/consumer.h>
33
34#include "pcie-rcar.h"
35
36struct rcar_msi {
37 DECLARE_BITMAP(used, INT_PCI_MSI_NR);
38 struct irq_domain *domain;
39 struct mutex map_lock;
40 spinlock_t mask_lock;
41 int irq1;
42 int irq2;
43};
44
45/* Structure representing the PCIe interface */
46struct rcar_pcie_host {
47 struct rcar_pcie pcie;
48 struct phy *phy;
49 struct clk *bus_clk;
50 struct rcar_msi msi;
51 int (*phy_init_fn)(struct rcar_pcie_host *host);
52};
53
54static DEFINE_SPINLOCK(pmsr_lock);
55
56static int rcar_pcie_wakeup(struct device *pcie_dev, void __iomem *pcie_base)
57{
58 unsigned long flags;
59 u32 pmsr, val;
60 int ret = 0;
61
62 spin_lock_irqsave(&pmsr_lock, flags);
63
64 if (!pcie_base || pm_runtime_suspended(pcie_dev)) {
65 ret = -EINVAL;
66 goto unlock_exit;
67 }
68
69 pmsr = readl(pcie_base + PMSR);
70
71 /*
72 * Test if the PCIe controller received PM_ENTER_L1 DLLP and
73 * the PCIe controller is not in L1 link state. If true, apply
74 * fix, which will put the controller into L1 link state, from
75 * which it can return to L0s/L0 on its own.
76 */
77 if ((pmsr & PMEL1RX) && ((pmsr & PMSTATE) != PMSTATE_L1)) {
78 writel(L1IATN, pcie_base + PMCTLR);
79 ret = readl_poll_timeout_atomic(pcie_base + PMSR, val,
80 val & L1FAEG, 10, 1000);
81 if (ret) {
82 dev_warn_ratelimited(pcie_dev,
83 "Timeout waiting for L1 link state, ret=%d\n",
84 ret);
85 }
86 writel(L1FAEG | PMEL1RX, pcie_base + PMSR);
87 }
88
89unlock_exit:
90 spin_unlock_irqrestore(&pmsr_lock, flags);
91 return ret;
92}
93
94static struct rcar_pcie_host *msi_to_host(struct rcar_msi *msi)
95{
96 return container_of(msi, struct rcar_pcie_host, msi);
97}
98
99static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
100{
101 unsigned int shift = BITS_PER_BYTE * (where & 3);
102 u32 val = rcar_pci_read_reg(pcie, where & ~3);
103
104 return val >> shift;
105}
106
107#ifdef CONFIG_ARM
108#define __rcar_pci_rw_reg_workaround(instr) \
109 " .arch armv7-a\n" \
110 "1: " instr " %1, [%2]\n" \
111 "2: isb\n" \
112 "3: .pushsection .text.fixup,\"ax\"\n" \
113 " .align 2\n" \
114 "4: mov %0, #" __stringify(PCIBIOS_SET_FAILED) "\n" \
115 " b 3b\n" \
116 " .popsection\n" \
117 " .pushsection __ex_table,\"a\"\n" \
118 " .align 3\n" \
119 " .long 1b, 4b\n" \
120 " .long 2b, 4b\n" \
121 " .popsection\n"
122#endif
123
124static int rcar_pci_write_reg_workaround(struct rcar_pcie *pcie, u32 val,
125 unsigned int reg)
126{
127 int error = PCIBIOS_SUCCESSFUL;
128#ifdef CONFIG_ARM
129 asm volatile(
130 __rcar_pci_rw_reg_workaround("str")
131 : "+r"(error):"r"(val), "r"(pcie->base + reg) : "memory");
132#else
133 rcar_pci_write_reg(pcie, val, reg);
134#endif
135 return error;
136}
137
138static int rcar_pci_read_reg_workaround(struct rcar_pcie *pcie, u32 *val,
139 unsigned int reg)
140{
141 int error = PCIBIOS_SUCCESSFUL;
142#ifdef CONFIG_ARM
143 asm volatile(
144 __rcar_pci_rw_reg_workaround("ldr")
145 : "+r"(error), "=r"(*val) : "r"(pcie->base + reg) : "memory");
146
147 if (error != PCIBIOS_SUCCESSFUL)
148 PCI_SET_ERROR_RESPONSE(val);
149#else
150 *val = rcar_pci_read_reg(pcie, reg);
151#endif
152 return error;
153}
154
155/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
156static int rcar_pcie_config_access(struct rcar_pcie_host *host,
157 unsigned char access_type, struct pci_bus *bus,
158 unsigned int devfn, int where, u32 *data)
159{
160 struct rcar_pcie *pcie = &host->pcie;
161 unsigned int dev, func, reg, index;
162 int ret;
163
164 /* Wake the bus up in case it is in L1 state. */
165 ret = rcar_pcie_wakeup(pcie->dev, pcie->base);
166 if (ret) {
167 PCI_SET_ERROR_RESPONSE(data);
168 return PCIBIOS_SET_FAILED;
169 }
170
171 dev = PCI_SLOT(devfn);
172 func = PCI_FUNC(devfn);
173 reg = where & ~3;
174 index = reg / 4;
175
176 /*
177 * While each channel has its own memory-mapped extended config
178 * space, it's generally only accessible when in endpoint mode.
179 * When in root complex mode, the controller is unable to target
180 * itself with either type 0 or type 1 accesses, and indeed, any
181 * controller initiated target transfer to its own config space
182 * result in a completer abort.
183 *
184 * Each channel effectively only supports a single device, but as
185 * the same channel <-> device access works for any PCI_SLOT()
186 * value, we cheat a bit here and bind the controller's config
187 * space to devfn 0 in order to enable self-enumeration. In this
188 * case the regular ECAR/ECDR path is sidelined and the mangled
189 * config access itself is initiated as an internal bus transaction.
190 */
191 if (pci_is_root_bus(bus)) {
192 if (dev != 0)
193 return PCIBIOS_DEVICE_NOT_FOUND;
194
195 if (access_type == RCAR_PCI_ACCESS_READ)
196 *data = rcar_pci_read_reg(pcie, PCICONF(index));
197 else
198 rcar_pci_write_reg(pcie, *data, PCICONF(index));
199
200 return PCIBIOS_SUCCESSFUL;
201 }
202
203 /* Clear errors */
204 rcar_pci_write_reg(pcie, rcar_pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);
205
206 /* Set the PIO address */
207 rcar_pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) |
208 PCIE_CONF_DEV(dev) | PCIE_CONF_FUNC(func) | reg, PCIECAR);
209
210 /* Enable the configuration access */
211 if (pci_is_root_bus(bus->parent))
212 rcar_pci_write_reg(pcie, PCIECCTLR_CCIE | TYPE0, PCIECCTLR);
213 else
214 rcar_pci_write_reg(pcie, PCIECCTLR_CCIE | TYPE1, PCIECCTLR);
215
216 /* Check for errors */
217 if (rcar_pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST)
218 return PCIBIOS_DEVICE_NOT_FOUND;
219
220 /* Check for master and target aborts */
221 if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) &
222 (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
223 return PCIBIOS_DEVICE_NOT_FOUND;
224
225 if (access_type == RCAR_PCI_ACCESS_READ)
226 ret = rcar_pci_read_reg_workaround(pcie, data, PCIECDR);
227 else
228 ret = rcar_pci_write_reg_workaround(pcie, *data, PCIECDR);
229
230 /* Disable the configuration access */
231 rcar_pci_write_reg(pcie, 0, PCIECCTLR);
232
233 return ret;
234}
235
236static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
237 int where, int size, u32 *val)
238{
239 struct rcar_pcie_host *host = bus->sysdata;
240 int ret;
241
242 ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
243 bus, devfn, where, val);
244 if (ret != PCIBIOS_SUCCESSFUL)
245 return ret;
246
247 if (size == 1)
248 *val = (*val >> (BITS_PER_BYTE * (where & 3))) & 0xff;
249 else if (size == 2)
250 *val = (*val >> (BITS_PER_BYTE * (where & 2))) & 0xffff;
251
252 dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
253 bus->number, devfn, where, size, *val);
254
255 return ret;
256}
257
258/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
259static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
260 int where, int size, u32 val)
261{
262 struct rcar_pcie_host *host = bus->sysdata;
263 unsigned int shift;
264 u32 data;
265 int ret;
266
267 ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
268 bus, devfn, where, &data);
269 if (ret != PCIBIOS_SUCCESSFUL)
270 return ret;
271
272 dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
273 bus->number, devfn, where, size, val);
274
275 if (size == 1) {
276 shift = BITS_PER_BYTE * (where & 3);
277 data &= ~(0xff << shift);
278 data |= ((val & 0xff) << shift);
279 } else if (size == 2) {
280 shift = BITS_PER_BYTE * (where & 2);
281 data &= ~(0xffff << shift);
282 data |= ((val & 0xffff) << shift);
283 } else
284 data = val;
285
286 ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_WRITE,
287 bus, devfn, where, &data);
288
289 return ret;
290}
291
292static struct pci_ops rcar_pcie_ops = {
293 .read = rcar_pcie_read_conf,
294 .write = rcar_pcie_write_conf,
295};
296
297static void rcar_pcie_force_speedup(struct rcar_pcie *pcie)
298{
299 struct device *dev = pcie->dev;
300 unsigned int timeout = 1000;
301 u32 macsr;
302
303 if ((rcar_pci_read_reg(pcie, MACS2R) & LINK_SPEED) != LINK_SPEED_5_0GTS)
304 return;
305
306 if (rcar_pci_read_reg(pcie, MACCTLR) & SPEED_CHANGE) {
307 dev_err(dev, "Speed change already in progress\n");
308 return;
309 }
310
311 macsr = rcar_pci_read_reg(pcie, MACSR);
312 if ((macsr & LINK_SPEED) == LINK_SPEED_5_0GTS)
313 goto done;
314
315 /* Set target link speed to 5.0 GT/s */
316 rcar_rmw32(pcie, EXPCAP(12), PCI_EXP_LNKSTA_CLS,
317 PCI_EXP_LNKSTA_CLS_5_0GB);
318
319 /* Set speed change reason as intentional factor */
320 rcar_rmw32(pcie, MACCGSPSETR, SPCNGRSN, 0);
321
322 /* Clear SPCHGFIN, SPCHGSUC, and SPCHGFAIL */
323 if (macsr & (SPCHGFIN | SPCHGSUC | SPCHGFAIL))
324 rcar_pci_write_reg(pcie, macsr, MACSR);
325
326 /* Start link speed change */
327 rcar_rmw32(pcie, MACCTLR, SPEED_CHANGE, SPEED_CHANGE);
328
329 while (timeout--) {
330 macsr = rcar_pci_read_reg(pcie, MACSR);
331 if (macsr & SPCHGFIN) {
332 /* Clear the interrupt bits */
333 rcar_pci_write_reg(pcie, macsr, MACSR);
334
335 if (macsr & SPCHGFAIL)
336 dev_err(dev, "Speed change failed\n");
337
338 goto done;
339 }
340
341 msleep(1);
342 }
343
344 dev_err(dev, "Speed change timed out\n");
345
346done:
347 dev_info(dev, "Current link speed is %s GT/s\n",
348 (macsr & LINK_SPEED) == LINK_SPEED_5_0GTS ? "5" : "2.5");
349}
350
351static void rcar_pcie_hw_enable(struct rcar_pcie_host *host)
352{
353 struct rcar_pcie *pcie = &host->pcie;
354 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
355 struct resource_entry *win;
356 LIST_HEAD(res);
357 int i = 0;
358
359 /* Try setting 5 GT/s link speed */
360 rcar_pcie_force_speedup(pcie);
361
362 /* Setup PCI resources */
363 resource_list_for_each_entry(win, &bridge->windows) {
364 struct resource *res = win->res;
365
366 if (!res->flags)
367 continue;
368
369 switch (resource_type(res)) {
370 case IORESOURCE_IO:
371 case IORESOURCE_MEM:
372 rcar_pcie_set_outbound(pcie, i, win);
373 i++;
374 break;
375 }
376 }
377}
378
379static int rcar_pcie_enable(struct rcar_pcie_host *host)
380{
381 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
382
383 rcar_pcie_hw_enable(host);
384
385 pci_add_flags(PCI_REASSIGN_ALL_BUS);
386
387 bridge->sysdata = host;
388 bridge->ops = &rcar_pcie_ops;
389
390 return pci_host_probe(bridge);
391}
392
393static int phy_wait_for_ack(struct rcar_pcie *pcie)
394{
395 struct device *dev = pcie->dev;
396 unsigned int timeout = 100;
397
398 while (timeout--) {
399 if (rcar_pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
400 return 0;
401
402 udelay(100);
403 }
404
405 dev_err(dev, "Access to PCIe phy timed out\n");
406
407 return -ETIMEDOUT;
408}
409
410static void phy_write_reg(struct rcar_pcie *pcie,
411 unsigned int rate, u32 addr,
412 unsigned int lane, u32 data)
413{
414 u32 phyaddr;
415
416 phyaddr = WRITE_CMD |
417 ((rate & 1) << RATE_POS) |
418 ((lane & 0xf) << LANE_POS) |
419 ((addr & 0xff) << ADR_POS);
420
421 /* Set write data */
422 rcar_pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
423 rcar_pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR);
424
425 /* Ignore errors as they will be dealt with if the data link is down */
426 phy_wait_for_ack(pcie);
427
428 /* Clear command */
429 rcar_pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
430 rcar_pci_write_reg(pcie, 0, H1_PCIEPHYADRR);
431
432 /* Ignore errors as they will be dealt with if the data link is down */
433 phy_wait_for_ack(pcie);
434}
435
436static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
437{
438 int err;
439
440 /* Begin initialization */
441 rcar_pci_write_reg(pcie, 0, PCIETCTLR);
442
443 /* Set mode */
444 rcar_pci_write_reg(pcie, 1, PCIEMSR);
445
446 err = rcar_pcie_wait_for_phyrdy(pcie);
447 if (err)
448 return err;
449
450 /*
451 * Initial header for port config space is type 1, set the device
452 * class to match. Hardware takes care of propagating the IDSETR
453 * settings, so there is no need to bother with a quirk.
454 */
455 rcar_pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI_NORMAL << 8, IDSETR1);
456
457 /*
458 * Setup Secondary Bus Number & Subordinate Bus Number, even though
459 * they aren't used, to avoid bridge being detected as broken.
460 */
461 rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
462 rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
463
464 /* Initialize default capabilities. */
465 rcar_rmw32(pcie, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
466 rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS),
467 PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
468 rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), PCI_HEADER_TYPE_MASK,
469 PCI_HEADER_TYPE_BRIDGE);
470
471 /* Enable data link layer active state reporting */
472 rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), PCI_EXP_LNKCAP_DLLLARC,
473 PCI_EXP_LNKCAP_DLLLARC);
474
475 /* Write out the physical slot number = 0 */
476 rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0);
477
478 /* Set the completion timer timeout to the maximum 50ms. */
479 rcar_rmw32(pcie, TLCTLR + 1, 0x3f, 50);
480
481 /* Terminate list of capabilities (Next Capability Offset=0) */
482 rcar_rmw32(pcie, RVCCAP(0), 0xfff00000, 0);
483
484 /* Enable MSI */
485 if (IS_ENABLED(CONFIG_PCI_MSI))
486 rcar_pci_write_reg(pcie, 0x801f0000, PCIEMSITXR);
487
488 rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR);
489
490 /* Finish initialization - establish a PCI Express link */
491 rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
492
493 /* This will timeout if we don't have a link. */
494 err = rcar_pcie_wait_for_dl(pcie);
495 if (err)
496 return err;
497
498 /* Enable INTx interrupts */
499 rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8);
500
501 wmb();
502
503 return 0;
504}
505
506static int rcar_pcie_phy_init_h1(struct rcar_pcie_host *host)
507{
508 struct rcar_pcie *pcie = &host->pcie;
509
510 /* Initialize the phy */
511 phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191);
512 phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180);
513 phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188);
514 phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188);
515 phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014);
516 phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014);
517 phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0);
518 phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB);
519 phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062);
520 phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000);
521 phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000);
522 phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806);
523
524 phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5);
525 phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F);
526 phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000);
527
528 return 0;
529}
530
531static int rcar_pcie_phy_init_gen2(struct rcar_pcie_host *host)
532{
533 struct rcar_pcie *pcie = &host->pcie;
534
535 /*
536 * These settings come from the R-Car Series, 2nd Generation User's
537 * Manual, section 50.3.1 (2) Initialization of the physical layer.
538 */
539 rcar_pci_write_reg(pcie, 0x000f0030, GEN2_PCIEPHYADDR);
540 rcar_pci_write_reg(pcie, 0x00381203, GEN2_PCIEPHYDATA);
541 rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
542 rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
543
544 rcar_pci_write_reg(pcie, 0x000f0054, GEN2_PCIEPHYADDR);
545 /* The following value is for DC connection, no termination resistor */
546 rcar_pci_write_reg(pcie, 0x13802007, GEN2_PCIEPHYDATA);
547 rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
548 rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
549
550 return 0;
551}
552
553static int rcar_pcie_phy_init_gen3(struct rcar_pcie_host *host)
554{
555 int err;
556
557 err = phy_init(host->phy);
558 if (err)
559 return err;
560
561 err = phy_power_on(host->phy);
562 if (err)
563 phy_exit(host->phy);
564
565 return err;
566}
567
568static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
569{
570 struct rcar_pcie_host *host = data;
571 struct rcar_pcie *pcie = &host->pcie;
572 struct rcar_msi *msi = &host->msi;
573 struct device *dev = pcie->dev;
574 unsigned long reg;
575
576 reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
577
578 /* MSI & INTx share an interrupt - we only handle MSI here */
579 if (!reg)
580 return IRQ_NONE;
581
582 while (reg) {
583 unsigned int index = find_first_bit(®, 32);
584 int ret;
585
586 ret = generic_handle_domain_irq(msi->domain->parent, index);
587 if (ret) {
588 /* Unknown MSI, just clear it */
589 dev_dbg(dev, "unexpected MSI\n");
590 rcar_pci_write_reg(pcie, BIT(index), PCIEMSIFR);
591 }
592
593 /* see if there's any more pending in this vector */
594 reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
595 }
596
597 return IRQ_HANDLED;
598}
599
600static void rcar_msi_top_irq_ack(struct irq_data *d)
601{
602 irq_chip_ack_parent(d);
603}
604
605static void rcar_msi_top_irq_mask(struct irq_data *d)
606{
607 pci_msi_mask_irq(d);
608 irq_chip_mask_parent(d);
609}
610
611static void rcar_msi_top_irq_unmask(struct irq_data *d)
612{
613 pci_msi_unmask_irq(d);
614 irq_chip_unmask_parent(d);
615}
616
617static struct irq_chip rcar_msi_top_chip = {
618 .name = "PCIe MSI",
619 .irq_ack = rcar_msi_top_irq_ack,
620 .irq_mask = rcar_msi_top_irq_mask,
621 .irq_unmask = rcar_msi_top_irq_unmask,
622};
623
624static void rcar_msi_irq_ack(struct irq_data *d)
625{
626 struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
627 struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
628
629 /* clear the interrupt */
630 rcar_pci_write_reg(pcie, BIT(d->hwirq), PCIEMSIFR);
631}
632
633static void rcar_msi_irq_mask(struct irq_data *d)
634{
635 struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
636 struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
637 unsigned long flags;
638 u32 value;
639
640 spin_lock_irqsave(&msi->mask_lock, flags);
641 value = rcar_pci_read_reg(pcie, PCIEMSIIER);
642 value &= ~BIT(d->hwirq);
643 rcar_pci_write_reg(pcie, value, PCIEMSIIER);
644 spin_unlock_irqrestore(&msi->mask_lock, flags);
645}
646
647static void rcar_msi_irq_unmask(struct irq_data *d)
648{
649 struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
650 struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
651 unsigned long flags;
652 u32 value;
653
654 spin_lock_irqsave(&msi->mask_lock, flags);
655 value = rcar_pci_read_reg(pcie, PCIEMSIIER);
656 value |= BIT(d->hwirq);
657 rcar_pci_write_reg(pcie, value, PCIEMSIIER);
658 spin_unlock_irqrestore(&msi->mask_lock, flags);
659}
660
661static void rcar_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
662{
663 struct rcar_msi *msi = irq_data_get_irq_chip_data(data);
664 struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
665
666 msg->address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
667 msg->address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
668 msg->data = data->hwirq;
669}
670
671static struct irq_chip rcar_msi_bottom_chip = {
672 .name = "R-Car MSI",
673 .irq_ack = rcar_msi_irq_ack,
674 .irq_mask = rcar_msi_irq_mask,
675 .irq_unmask = rcar_msi_irq_unmask,
676 .irq_compose_msi_msg = rcar_compose_msi_msg,
677};
678
679static int rcar_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
680 unsigned int nr_irqs, void *args)
681{
682 struct rcar_msi *msi = domain->host_data;
683 unsigned int i;
684 int hwirq;
685
686 mutex_lock(&msi->map_lock);
687
688 hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs));
689
690 mutex_unlock(&msi->map_lock);
691
692 if (hwirq < 0)
693 return -ENOSPC;
694
695 for (i = 0; i < nr_irqs; i++)
696 irq_domain_set_info(domain, virq + i, hwirq + i,
697 &rcar_msi_bottom_chip, domain->host_data,
698 handle_edge_irq, NULL, NULL);
699
700 return 0;
701}
702
703static void rcar_msi_domain_free(struct irq_domain *domain, unsigned int virq,
704 unsigned int nr_irqs)
705{
706 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
707 struct rcar_msi *msi = domain->host_data;
708
709 mutex_lock(&msi->map_lock);
710
711 bitmap_release_region(msi->used, d->hwirq, order_base_2(nr_irqs));
712
713 mutex_unlock(&msi->map_lock);
714}
715
716static const struct irq_domain_ops rcar_msi_domain_ops = {
717 .alloc = rcar_msi_domain_alloc,
718 .free = rcar_msi_domain_free,
719};
720
721static struct msi_domain_info rcar_msi_info = {
722 .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
723 MSI_FLAG_NO_AFFINITY | MSI_FLAG_MULTI_PCI_MSI,
724 .chip = &rcar_msi_top_chip,
725};
726
727static int rcar_allocate_domains(struct rcar_msi *msi)
728{
729 struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
730 struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
731 struct irq_domain *parent;
732
733 parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR,
734 &rcar_msi_domain_ops, msi);
735 if (!parent) {
736 dev_err(pcie->dev, "failed to create IRQ domain\n");
737 return -ENOMEM;
738 }
739 irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
740
741 msi->domain = pci_msi_create_irq_domain(fwnode, &rcar_msi_info, parent);
742 if (!msi->domain) {
743 dev_err(pcie->dev, "failed to create MSI domain\n");
744 irq_domain_remove(parent);
745 return -ENOMEM;
746 }
747
748 return 0;
749}
750
751static void rcar_free_domains(struct rcar_msi *msi)
752{
753 struct irq_domain *parent = msi->domain->parent;
754
755 irq_domain_remove(msi->domain);
756 irq_domain_remove(parent);
757}
758
759static int rcar_pcie_enable_msi(struct rcar_pcie_host *host)
760{
761 struct rcar_pcie *pcie = &host->pcie;
762 struct device *dev = pcie->dev;
763 struct rcar_msi *msi = &host->msi;
764 struct resource res;
765 int err;
766
767 mutex_init(&msi->map_lock);
768 spin_lock_init(&msi->mask_lock);
769
770 err = of_address_to_resource(dev->of_node, 0, &res);
771 if (err)
772 return err;
773
774 err = rcar_allocate_domains(msi);
775 if (err)
776 return err;
777
778 /* Two irqs are for MSI, but they are also used for non-MSI irqs */
779 err = devm_request_irq(dev, msi->irq1, rcar_pcie_msi_irq,
780 IRQF_SHARED | IRQF_NO_THREAD,
781 rcar_msi_bottom_chip.name, host);
782 if (err < 0) {
783 dev_err(dev, "failed to request IRQ: %d\n", err);
784 goto err;
785 }
786
787 err = devm_request_irq(dev, msi->irq2, rcar_pcie_msi_irq,
788 IRQF_SHARED | IRQF_NO_THREAD,
789 rcar_msi_bottom_chip.name, host);
790 if (err < 0) {
791 dev_err(dev, "failed to request IRQ: %d\n", err);
792 goto err;
793 }
794
795 /* disable all MSIs */
796 rcar_pci_write_reg(pcie, 0, PCIEMSIIER);
797
798 /*
799 * Setup MSI data target using RC base address, which is guaranteed
800 * to be in the low 32bit range on any R-Car HW.
801 */
802 rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
803 rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR);
804
805 return 0;
806
807err:
808 rcar_free_domains(msi);
809 return err;
810}
811
812static void rcar_pcie_teardown_msi(struct rcar_pcie_host *host)
813{
814 struct rcar_pcie *pcie = &host->pcie;
815
816 /* Disable all MSI interrupts */
817 rcar_pci_write_reg(pcie, 0, PCIEMSIIER);
818
819 /* Disable address decoding of the MSI interrupt, MSIFE */
820 rcar_pci_write_reg(pcie, 0, PCIEMSIALR);
821
822 rcar_free_domains(&host->msi);
823}
824
825static int rcar_pcie_get_resources(struct rcar_pcie_host *host)
826{
827 struct rcar_pcie *pcie = &host->pcie;
828 struct device *dev = pcie->dev;
829 struct resource res;
830 int err, i;
831
832 host->phy = devm_phy_optional_get(dev, "pcie");
833 if (IS_ERR(host->phy))
834 return PTR_ERR(host->phy);
835
836 err = of_address_to_resource(dev->of_node, 0, &res);
837 if (err)
838 return err;
839
840 pcie->base = devm_ioremap_resource(dev, &res);
841 if (IS_ERR(pcie->base))
842 return PTR_ERR(pcie->base);
843
844 host->bus_clk = devm_clk_get(dev, "pcie_bus");
845 if (IS_ERR(host->bus_clk)) {
846 dev_err(dev, "cannot get pcie bus clock\n");
847 return PTR_ERR(host->bus_clk);
848 }
849
850 i = irq_of_parse_and_map(dev->of_node, 0);
851 if (!i) {
852 dev_err(dev, "cannot get platform resources for msi interrupt\n");
853 err = -ENOENT;
854 goto err_irq1;
855 }
856 host->msi.irq1 = i;
857
858 i = irq_of_parse_and_map(dev->of_node, 1);
859 if (!i) {
860 dev_err(dev, "cannot get platform resources for msi interrupt\n");
861 err = -ENOENT;
862 goto err_irq2;
863 }
864 host->msi.irq2 = i;
865
866 return 0;
867
868err_irq2:
869 irq_dispose_mapping(host->msi.irq1);
870err_irq1:
871 return err;
872}
873
874static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
875 struct resource_entry *entry,
876 int *index)
877{
878 u64 restype = entry->res->flags;
879 u64 cpu_addr = entry->res->start;
880 u64 cpu_end = entry->res->end;
881 u64 pci_addr = entry->res->start - entry->offset;
882 u32 flags = LAM_64BIT | LAR_ENABLE;
883 u64 mask;
884 u64 size = resource_size(entry->res);
885 int idx = *index;
886
887 if (restype & IORESOURCE_PREFETCH)
888 flags |= LAM_PREFETCH;
889
890 while (cpu_addr < cpu_end) {
891 if (idx >= MAX_NR_INBOUND_MAPS - 1) {
892 dev_err(pcie->dev, "Failed to map inbound regions!\n");
893 return -EINVAL;
894 }
895 /*
896 * If the size of the range is larger than the alignment of
897 * the start address, we have to use multiple entries to
898 * perform the mapping.
899 */
900 if (cpu_addr > 0) {
901 unsigned long nr_zeros = __ffs64(cpu_addr);
902 u64 alignment = 1ULL << nr_zeros;
903
904 size = min(size, alignment);
905 }
906 /* Hardware supports max 4GiB inbound region */
907 size = min(size, 1ULL << 32);
908
909 mask = roundup_pow_of_two(size) - 1;
910 mask &= ~0xf;
911
912 rcar_pcie_set_inbound(pcie, cpu_addr, pci_addr,
913 lower_32_bits(mask) | flags, idx, true);
914
915 pci_addr += size;
916 cpu_addr += size;
917 idx += 2;
918 }
919 *index = idx;
920
921 return 0;
922}
923
924static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie_host *host)
925{
926 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
927 struct resource_entry *entry;
928 int index = 0, err = 0;
929
930 resource_list_for_each_entry(entry, &bridge->dma_ranges) {
931 err = rcar_pcie_inbound_ranges(&host->pcie, entry, &index);
932 if (err)
933 break;
934 }
935
936 return err;
937}
938
939static const struct of_device_id rcar_pcie_of_match[] = {
940 { .compatible = "renesas,pcie-r8a7779",
941 .data = rcar_pcie_phy_init_h1 },
942 { .compatible = "renesas,pcie-r8a7790",
943 .data = rcar_pcie_phy_init_gen2 },
944 { .compatible = "renesas,pcie-r8a7791",
945 .data = rcar_pcie_phy_init_gen2 },
946 { .compatible = "renesas,pcie-rcar-gen2",
947 .data = rcar_pcie_phy_init_gen2 },
948 { .compatible = "renesas,pcie-r8a7795",
949 .data = rcar_pcie_phy_init_gen3 },
950 { .compatible = "renesas,pcie-rcar-gen3",
951 .data = rcar_pcie_phy_init_gen3 },
952 {},
953};
954
955/* Design note 346 from Linear Technology says order is not important. */
956static const char * const rcar_pcie_supplies[] = {
957 "vpcie1v5",
958 "vpcie3v3",
959 "vpcie12v",
960};
961
962static int rcar_pcie_probe(struct platform_device *pdev)
963{
964 struct device *dev = &pdev->dev;
965 struct pci_host_bridge *bridge;
966 struct rcar_pcie_host *host;
967 struct rcar_pcie *pcie;
968 unsigned int i;
969 u32 data;
970 int err;
971
972 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*host));
973 if (!bridge)
974 return -ENOMEM;
975
976 host = pci_host_bridge_priv(bridge);
977 pcie = &host->pcie;
978 pcie->dev = dev;
979 platform_set_drvdata(pdev, host);
980
981 for (i = 0; i < ARRAY_SIZE(rcar_pcie_supplies); i++) {
982 err = devm_regulator_get_enable_optional(dev, rcar_pcie_supplies[i]);
983 if (err < 0 && err != -ENODEV)
984 return dev_err_probe(dev, err, "failed to enable regulator: %s\n",
985 rcar_pcie_supplies[i]);
986 }
987
988 pm_runtime_enable(pcie->dev);
989 err = pm_runtime_get_sync(pcie->dev);
990 if (err < 0) {
991 dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
992 goto err_pm_put;
993 }
994
995 err = rcar_pcie_get_resources(host);
996 if (err < 0) {
997 dev_err(dev, "failed to request resources: %d\n", err);
998 goto err_pm_put;
999 }
1000
1001 err = clk_prepare_enable(host->bus_clk);
1002 if (err) {
1003 dev_err(dev, "failed to enable bus clock: %d\n", err);
1004 goto err_unmap_msi_irqs;
1005 }
1006
1007 err = rcar_pcie_parse_map_dma_ranges(host);
1008 if (err)
1009 goto err_clk_disable;
1010
1011 host->phy_init_fn = of_device_get_match_data(dev);
1012 err = host->phy_init_fn(host);
1013 if (err) {
1014 dev_err(dev, "failed to init PCIe PHY\n");
1015 goto err_clk_disable;
1016 }
1017
1018 /* Failure to get a link might just be that no cards are inserted */
1019 if (rcar_pcie_hw_init(pcie)) {
1020 dev_info(dev, "PCIe link down\n");
1021 err = -ENODEV;
1022 goto err_phy_shutdown;
1023 }
1024
1025 data = rcar_pci_read_reg(pcie, MACSR);
1026 dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
1027
1028 if (IS_ENABLED(CONFIG_PCI_MSI)) {
1029 err = rcar_pcie_enable_msi(host);
1030 if (err < 0) {
1031 dev_err(dev,
1032 "failed to enable MSI support: %d\n",
1033 err);
1034 goto err_phy_shutdown;
1035 }
1036 }
1037
1038 err = rcar_pcie_enable(host);
1039 if (err)
1040 goto err_msi_teardown;
1041
1042 return 0;
1043
1044err_msi_teardown:
1045 if (IS_ENABLED(CONFIG_PCI_MSI))
1046 rcar_pcie_teardown_msi(host);
1047
1048err_phy_shutdown:
1049 if (host->phy) {
1050 phy_power_off(host->phy);
1051 phy_exit(host->phy);
1052 }
1053
1054err_clk_disable:
1055 clk_disable_unprepare(host->bus_clk);
1056
1057err_unmap_msi_irqs:
1058 irq_dispose_mapping(host->msi.irq2);
1059 irq_dispose_mapping(host->msi.irq1);
1060
1061err_pm_put:
1062 pm_runtime_put(dev);
1063 pm_runtime_disable(dev);
1064
1065 return err;
1066}
1067
1068static int rcar_pcie_resume(struct device *dev)
1069{
1070 struct rcar_pcie_host *host = dev_get_drvdata(dev);
1071 struct rcar_pcie *pcie = &host->pcie;
1072 unsigned int data;
1073 int err;
1074
1075 err = rcar_pcie_parse_map_dma_ranges(host);
1076 if (err)
1077 return 0;
1078
1079 /* Failure to get a link might just be that no cards are inserted */
1080 err = host->phy_init_fn(host);
1081 if (err) {
1082 dev_info(dev, "PCIe link down\n");
1083 return 0;
1084 }
1085
1086 data = rcar_pci_read_reg(pcie, MACSR);
1087 dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
1088
1089 /* Enable MSI */
1090 if (IS_ENABLED(CONFIG_PCI_MSI)) {
1091 struct resource res;
1092 u32 val;
1093
1094 of_address_to_resource(dev->of_node, 0, &res);
1095 rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR);
1096 rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
1097
1098 bitmap_to_arr32(&val, host->msi.used, INT_PCI_MSI_NR);
1099 rcar_pci_write_reg(pcie, val, PCIEMSIIER);
1100 }
1101
1102 rcar_pcie_hw_enable(host);
1103
1104 return 0;
1105}
1106
1107static int rcar_pcie_resume_noirq(struct device *dev)
1108{
1109 struct rcar_pcie_host *host = dev_get_drvdata(dev);
1110 struct rcar_pcie *pcie = &host->pcie;
1111
1112 if (rcar_pci_read_reg(pcie, PMSR) &&
1113 !(rcar_pci_read_reg(pcie, PCIETCTLR) & DL_DOWN))
1114 return 0;
1115
1116 /* Re-establish the PCIe link */
1117 rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR);
1118 rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
1119 return rcar_pcie_wait_for_dl(pcie);
1120}
1121
1122static const struct dev_pm_ops rcar_pcie_pm_ops = {
1123 SYSTEM_SLEEP_PM_OPS(NULL, rcar_pcie_resume)
1124 .resume_noirq = rcar_pcie_resume_noirq,
1125};
1126
1127static struct platform_driver rcar_pcie_driver = {
1128 .driver = {
1129 .name = "rcar-pcie",
1130 .of_match_table = rcar_pcie_of_match,
1131 .pm = &rcar_pcie_pm_ops,
1132 .suppress_bind_attrs = true,
1133 },
1134 .probe = rcar_pcie_probe,
1135};
1136
1137#ifdef CONFIG_ARM
1138static int rcar_pcie_aarch32_abort_handler(unsigned long addr,
1139 unsigned int fsr, struct pt_regs *regs)
1140{
1141 return !fixup_exception(regs);
1142}
1143
1144static const struct of_device_id rcar_pcie_abort_handler_of_match[] __initconst = {
1145 { .compatible = "renesas,pcie-r8a7779" },
1146 { .compatible = "renesas,pcie-r8a7790" },
1147 { .compatible = "renesas,pcie-r8a7791" },
1148 { .compatible = "renesas,pcie-rcar-gen2" },
1149 {},
1150};
1151
1152static int __init rcar_pcie_init(void)
1153{
1154 if (of_find_matching_node(NULL, rcar_pcie_abort_handler_of_match)) {
1155#ifdef CONFIG_ARM_LPAE
1156 hook_fault_code(17, rcar_pcie_aarch32_abort_handler, SIGBUS, 0,
1157 "asynchronous external abort");
1158#else
1159 hook_fault_code(22, rcar_pcie_aarch32_abort_handler, SIGBUS, 0,
1160 "imprecise external abort");
1161#endif
1162 }
1163
1164 return platform_driver_register(&rcar_pcie_driver);
1165}
1166device_initcall(rcar_pcie_init);
1167#else
1168builtin_platform_driver(rcar_pcie_driver);
1169#endif