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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCIe host controller driver for NWL PCIe Bridge
4 * Based on pcie-xilinx.c, pci-tegra.c
5 *
6 * (C) Copyright 2014 - 2015, Xilinx, Inc.
7 */
8
9#include <linux/delay.h>
10#include <linux/interrupt.h>
11#include <linux/irq.h>
12#include <linux/irqdomain.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/msi.h>
16#include <linux/of_address.h>
17#include <linux/of_pci.h>
18#include <linux/of_platform.h>
19#include <linux/of_irq.h>
20#include <linux/pci.h>
21#include <linux/platform_device.h>
22#include <linux/irqchip/chained_irq.h>
23
24#include "../pci.h"
25
26/* Bridge core config registers */
27#define BRCFG_PCIE_RX0 0x00000000
28#define BRCFG_INTERRUPT 0x00000010
29#define BRCFG_PCIE_RX_MSG_FILTER 0x00000020
30
31/* Egress - Bridge translation registers */
32#define E_BREG_CAPABILITIES 0x00000200
33#define E_BREG_CONTROL 0x00000208
34#define E_BREG_BASE_LO 0x00000210
35#define E_BREG_BASE_HI 0x00000214
36#define E_ECAM_CAPABILITIES 0x00000220
37#define E_ECAM_CONTROL 0x00000228
38#define E_ECAM_BASE_LO 0x00000230
39#define E_ECAM_BASE_HI 0x00000234
40
41/* Ingress - address translations */
42#define I_MSII_CAPABILITIES 0x00000300
43#define I_MSII_CONTROL 0x00000308
44#define I_MSII_BASE_LO 0x00000310
45#define I_MSII_BASE_HI 0x00000314
46
47#define I_ISUB_CONTROL 0x000003E8
48#define SET_ISUB_CONTROL BIT(0)
49/* Rxed msg fifo - Interrupt status registers */
50#define MSGF_MISC_STATUS 0x00000400
51#define MSGF_MISC_MASK 0x00000404
52#define MSGF_LEG_STATUS 0x00000420
53#define MSGF_LEG_MASK 0x00000424
54#define MSGF_MSI_STATUS_LO 0x00000440
55#define MSGF_MSI_STATUS_HI 0x00000444
56#define MSGF_MSI_MASK_LO 0x00000448
57#define MSGF_MSI_MASK_HI 0x0000044C
58
59/* Msg filter mask bits */
60#define CFG_ENABLE_PM_MSG_FWD BIT(1)
61#define CFG_ENABLE_INT_MSG_FWD BIT(2)
62#define CFG_ENABLE_ERR_MSG_FWD BIT(3)
63#define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \
64 CFG_ENABLE_INT_MSG_FWD | \
65 CFG_ENABLE_ERR_MSG_FWD)
66
67/* Misc interrupt status mask bits */
68#define MSGF_MISC_SR_RXMSG_AVAIL BIT(0)
69#define MSGF_MISC_SR_RXMSG_OVER BIT(1)
70#define MSGF_MISC_SR_SLAVE_ERR BIT(4)
71#define MSGF_MISC_SR_MASTER_ERR BIT(5)
72#define MSGF_MISC_SR_I_ADDR_ERR BIT(6)
73#define MSGF_MISC_SR_E_ADDR_ERR BIT(7)
74#define MSGF_MISC_SR_FATAL_AER BIT(16)
75#define MSGF_MISC_SR_NON_FATAL_AER BIT(17)
76#define MSGF_MISC_SR_CORR_AER BIT(18)
77#define MSGF_MISC_SR_UR_DETECT BIT(20)
78#define MSGF_MISC_SR_NON_FATAL_DEV BIT(22)
79#define MSGF_MISC_SR_FATAL_DEV BIT(23)
80#define MSGF_MISC_SR_LINK_DOWN BIT(24)
81#define MSGF_MSIC_SR_LINK_AUTO_BWIDTH BIT(25)
82#define MSGF_MSIC_SR_LINK_BWIDTH BIT(26)
83
84#define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \
85 MSGF_MISC_SR_RXMSG_OVER | \
86 MSGF_MISC_SR_SLAVE_ERR | \
87 MSGF_MISC_SR_MASTER_ERR | \
88 MSGF_MISC_SR_I_ADDR_ERR | \
89 MSGF_MISC_SR_E_ADDR_ERR | \
90 MSGF_MISC_SR_FATAL_AER | \
91 MSGF_MISC_SR_NON_FATAL_AER | \
92 MSGF_MISC_SR_CORR_AER | \
93 MSGF_MISC_SR_UR_DETECT | \
94 MSGF_MISC_SR_NON_FATAL_DEV | \
95 MSGF_MISC_SR_FATAL_DEV | \
96 MSGF_MISC_SR_LINK_DOWN | \
97 MSGF_MSIC_SR_LINK_AUTO_BWIDTH | \
98 MSGF_MSIC_SR_LINK_BWIDTH)
99
100/* Legacy interrupt status mask bits */
101#define MSGF_LEG_SR_INTA BIT(0)
102#define MSGF_LEG_SR_INTB BIT(1)
103#define MSGF_LEG_SR_INTC BIT(2)
104#define MSGF_LEG_SR_INTD BIT(3)
105#define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \
106 MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD)
107
108/* MSI interrupt status mask bits */
109#define MSGF_MSI_SR_LO_MASK GENMASK(31, 0)
110#define MSGF_MSI_SR_HI_MASK GENMASK(31, 0)
111
112#define MSII_PRESENT BIT(0)
113#define MSII_ENABLE BIT(0)
114#define MSII_STATUS_ENABLE BIT(15)
115
116/* Bridge config interrupt mask */
117#define BRCFG_INTERRUPT_MASK BIT(0)
118#define BREG_PRESENT BIT(0)
119#define BREG_ENABLE BIT(0)
120#define BREG_ENABLE_FORCE BIT(1)
121
122/* E_ECAM status mask bits */
123#define E_ECAM_PRESENT BIT(0)
124#define E_ECAM_CR_ENABLE BIT(0)
125#define E_ECAM_SIZE_LOC GENMASK(20, 16)
126#define E_ECAM_SIZE_SHIFT 16
127#define ECAM_BUS_LOC_SHIFT 20
128#define ECAM_DEV_LOC_SHIFT 12
129#define NWL_ECAM_VALUE_DEFAULT 12
130
131#define CFG_DMA_REG_BAR GENMASK(2, 0)
132
133#define INT_PCI_MSI_NR (2 * 32)
134
135/* Readin the PS_LINKUP */
136#define PS_LINKUP_OFFSET 0x00000238
137#define PCIE_PHY_LINKUP_BIT BIT(0)
138#define PHY_RDY_LINKUP_BIT BIT(1)
139
140/* Parameters for the waiting for link up routine */
141#define LINK_WAIT_MAX_RETRIES 10
142#define LINK_WAIT_USLEEP_MIN 90000
143#define LINK_WAIT_USLEEP_MAX 100000
144
145struct nwl_msi { /* MSI information */
146 struct irq_domain *msi_domain;
147 unsigned long *bitmap;
148 struct irq_domain *dev_domain;
149 struct mutex lock; /* protect bitmap variable */
150 int irq_msi0;
151 int irq_msi1;
152};
153
154struct nwl_pcie {
155 struct device *dev;
156 void __iomem *breg_base;
157 void __iomem *pcireg_base;
158 void __iomem *ecam_base;
159 phys_addr_t phys_breg_base; /* Physical Bridge Register Base */
160 phys_addr_t phys_pcie_reg_base; /* Physical PCIe Controller Base */
161 phys_addr_t phys_ecam_base; /* Physical Configuration Base */
162 u32 breg_size;
163 u32 pcie_reg_size;
164 u32 ecam_size;
165 int irq_intx;
166 int irq_misc;
167 u32 ecam_value;
168 u8 last_busno;
169 struct nwl_msi msi;
170 struct irq_domain *legacy_irq_domain;
171 raw_spinlock_t leg_mask_lock;
172};
173
174static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off)
175{
176 return readl(pcie->breg_base + off);
177}
178
179static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off)
180{
181 writel(val, pcie->breg_base + off);
182}
183
184static bool nwl_pcie_link_up(struct nwl_pcie *pcie)
185{
186 if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PCIE_PHY_LINKUP_BIT)
187 return true;
188 return false;
189}
190
191static bool nwl_phy_link_up(struct nwl_pcie *pcie)
192{
193 if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PHY_RDY_LINKUP_BIT)
194 return true;
195 return false;
196}
197
198static int nwl_wait_for_link(struct nwl_pcie *pcie)
199{
200 struct device *dev = pcie->dev;
201 int retries;
202
203 /* check if the link is up or not */
204 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
205 if (nwl_phy_link_up(pcie))
206 return 0;
207 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
208 }
209
210 dev_err(dev, "PHY link never came up\n");
211 return -ETIMEDOUT;
212}
213
214static bool nwl_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
215{
216 struct nwl_pcie *pcie = bus->sysdata;
217
218 /* Check link before accessing downstream ports */
219 if (!pci_is_root_bus(bus)) {
220 if (!nwl_pcie_link_up(pcie))
221 return false;
222 } else if (devfn > 0)
223 /* Only one device down on each root port */
224 return false;
225
226 return true;
227}
228
229/**
230 * nwl_pcie_map_bus - Get configuration base
231 *
232 * @bus: Bus structure of current bus
233 * @devfn: Device/function
234 * @where: Offset from base
235 *
236 * Return: Base address of the configuration space needed to be
237 * accessed.
238 */
239static void __iomem *nwl_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
240 int where)
241{
242 struct nwl_pcie *pcie = bus->sysdata;
243 int relbus;
244
245 if (!nwl_pcie_valid_device(bus, devfn))
246 return NULL;
247
248 relbus = (bus->number << ECAM_BUS_LOC_SHIFT) |
249 (devfn << ECAM_DEV_LOC_SHIFT);
250
251 return pcie->ecam_base + relbus + where;
252}
253
254/* PCIe operations */
255static struct pci_ops nwl_pcie_ops = {
256 .map_bus = nwl_pcie_map_bus,
257 .read = pci_generic_config_read,
258 .write = pci_generic_config_write,
259};
260
261static irqreturn_t nwl_pcie_misc_handler(int irq, void *data)
262{
263 struct nwl_pcie *pcie = data;
264 struct device *dev = pcie->dev;
265 u32 misc_stat;
266
267 /* Checking for misc interrupts */
268 misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
269 MSGF_MISC_SR_MASKALL;
270 if (!misc_stat)
271 return IRQ_NONE;
272
273 if (misc_stat & MSGF_MISC_SR_RXMSG_OVER)
274 dev_err(dev, "Received Message FIFO Overflow\n");
275
276 if (misc_stat & MSGF_MISC_SR_SLAVE_ERR)
277 dev_err(dev, "Slave error\n");
278
279 if (misc_stat & MSGF_MISC_SR_MASTER_ERR)
280 dev_err(dev, "Master error\n");
281
282 if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR)
283 dev_err(dev, "In Misc Ingress address translation error\n");
284
285 if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR)
286 dev_err(dev, "In Misc Egress address translation error\n");
287
288 if (misc_stat & MSGF_MISC_SR_FATAL_AER)
289 dev_err(dev, "Fatal Error in AER Capability\n");
290
291 if (misc_stat & MSGF_MISC_SR_NON_FATAL_AER)
292 dev_err(dev, "Non-Fatal Error in AER Capability\n");
293
294 if (misc_stat & MSGF_MISC_SR_CORR_AER)
295 dev_err(dev, "Correctable Error in AER Capability\n");
296
297 if (misc_stat & MSGF_MISC_SR_UR_DETECT)
298 dev_err(dev, "Unsupported request Detected\n");
299
300 if (misc_stat & MSGF_MISC_SR_NON_FATAL_DEV)
301 dev_err(dev, "Non-Fatal Error Detected\n");
302
303 if (misc_stat & MSGF_MISC_SR_FATAL_DEV)
304 dev_err(dev, "Fatal Error Detected\n");
305
306 if (misc_stat & MSGF_MSIC_SR_LINK_AUTO_BWIDTH)
307 dev_info(dev, "Link Autonomous Bandwidth Management Status bit set\n");
308
309 if (misc_stat & MSGF_MSIC_SR_LINK_BWIDTH)
310 dev_info(dev, "Link Bandwidth Management Status bit set\n");
311
312 /* Clear misc interrupt status */
313 nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS);
314
315 return IRQ_HANDLED;
316}
317
318static void nwl_pcie_leg_handler(struct irq_desc *desc)
319{
320 struct irq_chip *chip = irq_desc_get_chip(desc);
321 struct nwl_pcie *pcie;
322 unsigned long status;
323 u32 bit;
324 u32 virq;
325
326 chained_irq_enter(chip, desc);
327 pcie = irq_desc_get_handler_data(desc);
328
329 while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
330 MSGF_LEG_SR_MASKALL) != 0) {
331 for_each_set_bit(bit, &status, PCI_NUM_INTX) {
332 virq = irq_find_mapping(pcie->legacy_irq_domain, bit);
333 if (virq)
334 generic_handle_irq(virq);
335 }
336 }
337
338 chained_irq_exit(chip, desc);
339}
340
341static void nwl_pcie_handle_msi_irq(struct nwl_pcie *pcie, u32 status_reg)
342{
343 struct nwl_msi *msi;
344 unsigned long status;
345 u32 bit;
346 u32 virq;
347
348 msi = &pcie->msi;
349
350 while ((status = nwl_bridge_readl(pcie, status_reg)) != 0) {
351 for_each_set_bit(bit, &status, 32) {
352 nwl_bridge_writel(pcie, 1 << bit, status_reg);
353 virq = irq_find_mapping(msi->dev_domain, bit);
354 if (virq)
355 generic_handle_irq(virq);
356 }
357 }
358}
359
360static void nwl_pcie_msi_handler_high(struct irq_desc *desc)
361{
362 struct irq_chip *chip = irq_desc_get_chip(desc);
363 struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
364
365 chained_irq_enter(chip, desc);
366 nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_HI);
367 chained_irq_exit(chip, desc);
368}
369
370static void nwl_pcie_msi_handler_low(struct irq_desc *desc)
371{
372 struct irq_chip *chip = irq_desc_get_chip(desc);
373 struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
374
375 chained_irq_enter(chip, desc);
376 nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_LO);
377 chained_irq_exit(chip, desc);
378}
379
380static void nwl_mask_leg_irq(struct irq_data *data)
381{
382 struct irq_desc *desc = irq_to_desc(data->irq);
383 struct nwl_pcie *pcie;
384 unsigned long flags;
385 u32 mask;
386 u32 val;
387
388 pcie = irq_desc_get_chip_data(desc);
389 mask = 1 << (data->hwirq - 1);
390 raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
391 val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
392 nwl_bridge_writel(pcie, (val & (~mask)), MSGF_LEG_MASK);
393 raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
394}
395
396static void nwl_unmask_leg_irq(struct irq_data *data)
397{
398 struct irq_desc *desc = irq_to_desc(data->irq);
399 struct nwl_pcie *pcie;
400 unsigned long flags;
401 u32 mask;
402 u32 val;
403
404 pcie = irq_desc_get_chip_data(desc);
405 mask = 1 << (data->hwirq - 1);
406 raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
407 val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
408 nwl_bridge_writel(pcie, (val | mask), MSGF_LEG_MASK);
409 raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
410}
411
412static struct irq_chip nwl_leg_irq_chip = {
413 .name = "nwl_pcie:legacy",
414 .irq_enable = nwl_unmask_leg_irq,
415 .irq_disable = nwl_mask_leg_irq,
416 .irq_mask = nwl_mask_leg_irq,
417 .irq_unmask = nwl_unmask_leg_irq,
418};
419
420static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq,
421 irq_hw_number_t hwirq)
422{
423 irq_set_chip_and_handler(irq, &nwl_leg_irq_chip, handle_level_irq);
424 irq_set_chip_data(irq, domain->host_data);
425 irq_set_status_flags(irq, IRQ_LEVEL);
426
427 return 0;
428}
429
430static const struct irq_domain_ops legacy_domain_ops = {
431 .map = nwl_legacy_map,
432 .xlate = pci_irqd_intx_xlate,
433};
434
435#ifdef CONFIG_PCI_MSI
436static struct irq_chip nwl_msi_irq_chip = {
437 .name = "nwl_pcie:msi",
438 .irq_enable = pci_msi_unmask_irq,
439 .irq_disable = pci_msi_mask_irq,
440 .irq_mask = pci_msi_mask_irq,
441 .irq_unmask = pci_msi_unmask_irq,
442};
443
444static struct msi_domain_info nwl_msi_domain_info = {
445 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
446 MSI_FLAG_MULTI_PCI_MSI),
447 .chip = &nwl_msi_irq_chip,
448};
449#endif
450
451static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
452{
453 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
454 phys_addr_t msi_addr = pcie->phys_pcie_reg_base;
455
456 msg->address_lo = lower_32_bits(msi_addr);
457 msg->address_hi = upper_32_bits(msi_addr);
458 msg->data = data->hwirq;
459}
460
461static int nwl_msi_set_affinity(struct irq_data *irq_data,
462 const struct cpumask *mask, bool force)
463{
464 return -EINVAL;
465}
466
467static struct irq_chip nwl_irq_chip = {
468 .name = "Xilinx MSI",
469 .irq_compose_msi_msg = nwl_compose_msi_msg,
470 .irq_set_affinity = nwl_msi_set_affinity,
471};
472
473static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
474 unsigned int nr_irqs, void *args)
475{
476 struct nwl_pcie *pcie = domain->host_data;
477 struct nwl_msi *msi = &pcie->msi;
478 int bit;
479 int i;
480
481 mutex_lock(&msi->lock);
482 bit = bitmap_find_free_region(msi->bitmap, INT_PCI_MSI_NR,
483 get_count_order(nr_irqs));
484 if (bit < 0) {
485 mutex_unlock(&msi->lock);
486 return -ENOSPC;
487 }
488
489 for (i = 0; i < nr_irqs; i++) {
490 irq_domain_set_info(domain, virq + i, bit + i, &nwl_irq_chip,
491 domain->host_data, handle_simple_irq,
492 NULL, NULL);
493 }
494 mutex_unlock(&msi->lock);
495 return 0;
496}
497
498static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq,
499 unsigned int nr_irqs)
500{
501 struct irq_data *data = irq_domain_get_irq_data(domain, virq);
502 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
503 struct nwl_msi *msi = &pcie->msi;
504
505 mutex_lock(&msi->lock);
506 bitmap_release_region(msi->bitmap, data->hwirq,
507 get_count_order(nr_irqs));
508 mutex_unlock(&msi->lock);
509}
510
511static const struct irq_domain_ops dev_msi_domain_ops = {
512 .alloc = nwl_irq_domain_alloc,
513 .free = nwl_irq_domain_free,
514};
515
516static int nwl_pcie_init_msi_irq_domain(struct nwl_pcie *pcie)
517{
518#ifdef CONFIG_PCI_MSI
519 struct device *dev = pcie->dev;
520 struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
521 struct nwl_msi *msi = &pcie->msi;
522
523 msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR,
524 &dev_msi_domain_ops, pcie);
525 if (!msi->dev_domain) {
526 dev_err(dev, "failed to create dev IRQ domain\n");
527 return -ENOMEM;
528 }
529 msi->msi_domain = pci_msi_create_irq_domain(fwnode,
530 &nwl_msi_domain_info,
531 msi->dev_domain);
532 if (!msi->msi_domain) {
533 dev_err(dev, "failed to create msi IRQ domain\n");
534 irq_domain_remove(msi->dev_domain);
535 return -ENOMEM;
536 }
537#endif
538 return 0;
539}
540
541static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie)
542{
543 struct device *dev = pcie->dev;
544 struct device_node *node = dev->of_node;
545 struct device_node *legacy_intc_node;
546
547 legacy_intc_node = of_get_next_child(node, NULL);
548 if (!legacy_intc_node) {
549 dev_err(dev, "No legacy intc node found\n");
550 return -EINVAL;
551 }
552
553 pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node,
554 PCI_NUM_INTX,
555 &legacy_domain_ops,
556 pcie);
557 of_node_put(legacy_intc_node);
558 if (!pcie->legacy_irq_domain) {
559 dev_err(dev, "failed to create IRQ domain\n");
560 return -ENOMEM;
561 }
562
563 raw_spin_lock_init(&pcie->leg_mask_lock);
564 nwl_pcie_init_msi_irq_domain(pcie);
565 return 0;
566}
567
568static int nwl_pcie_enable_msi(struct nwl_pcie *pcie)
569{
570 struct device *dev = pcie->dev;
571 struct platform_device *pdev = to_platform_device(dev);
572 struct nwl_msi *msi = &pcie->msi;
573 unsigned long base;
574 int ret;
575 int size = BITS_TO_LONGS(INT_PCI_MSI_NR) * sizeof(long);
576
577 mutex_init(&msi->lock);
578
579 msi->bitmap = kzalloc(size, GFP_KERNEL);
580 if (!msi->bitmap)
581 return -ENOMEM;
582
583 /* Get msi_1 IRQ number */
584 msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1");
585 if (msi->irq_msi1 < 0) {
586 ret = -EINVAL;
587 goto err;
588 }
589
590 irq_set_chained_handler_and_data(msi->irq_msi1,
591 nwl_pcie_msi_handler_high, pcie);
592
593 /* Get msi_0 IRQ number */
594 msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0");
595 if (msi->irq_msi0 < 0) {
596 ret = -EINVAL;
597 goto err;
598 }
599
600 irq_set_chained_handler_and_data(msi->irq_msi0,
601 nwl_pcie_msi_handler_low, pcie);
602
603 /* Check for msii_present bit */
604 ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT;
605 if (!ret) {
606 dev_err(dev, "MSI not present\n");
607 ret = -EIO;
608 goto err;
609 }
610
611 /* Enable MSII */
612 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
613 MSII_ENABLE, I_MSII_CONTROL);
614
615 /* Enable MSII status */
616 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
617 MSII_STATUS_ENABLE, I_MSII_CONTROL);
618
619 /* setup AFI/FPCI range */
620 base = pcie->phys_pcie_reg_base;
621 nwl_bridge_writel(pcie, lower_32_bits(base), I_MSII_BASE_LO);
622 nwl_bridge_writel(pcie, upper_32_bits(base), I_MSII_BASE_HI);
623
624 /*
625 * For high range MSI interrupts: disable, clear any pending,
626 * and enable
627 */
628 nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_HI);
629
630 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) &
631 MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI);
632
633 nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI);
634
635 /*
636 * For low range MSI interrupts: disable, clear any pending,
637 * and enable
638 */
639 nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_LO);
640
641 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) &
642 MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO);
643
644 nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO);
645
646 return 0;
647err:
648 kfree(msi->bitmap);
649 msi->bitmap = NULL;
650 return ret;
651}
652
653static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
654{
655 struct device *dev = pcie->dev;
656 struct platform_device *pdev = to_platform_device(dev);
657 u32 breg_val, ecam_val, first_busno = 0;
658 int err;
659
660 breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT;
661 if (!breg_val) {
662 dev_err(dev, "BREG is not present\n");
663 return breg_val;
664 }
665
666 /* Write bridge_off to breg base */
667 nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_breg_base),
668 E_BREG_BASE_LO);
669 nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_breg_base),
670 E_BREG_BASE_HI);
671
672 /* Enable BREG */
673 nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE,
674 E_BREG_CONTROL);
675
676 /* Disable DMA channel registers */
677 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) |
678 CFG_DMA_REG_BAR, BRCFG_PCIE_RX0);
679
680 /* Enable Ingress subtractive decode translation */
681 nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL);
682
683 /* Enable msg filtering details */
684 nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK,
685 BRCFG_PCIE_RX_MSG_FILTER);
686
687 err = nwl_wait_for_link(pcie);
688 if (err)
689 return err;
690
691 ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT;
692 if (!ecam_val) {
693 dev_err(dev, "ECAM is not present\n");
694 return ecam_val;
695 }
696
697 /* Enable ECAM */
698 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
699 E_ECAM_CR_ENABLE, E_ECAM_CONTROL);
700
701 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
702 (pcie->ecam_value << E_ECAM_SIZE_SHIFT),
703 E_ECAM_CONTROL);
704
705 nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_ecam_base),
706 E_ECAM_BASE_LO);
707 nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_ecam_base),
708 E_ECAM_BASE_HI);
709
710 /* Get bus range */
711 ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL);
712 pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT;
713 /* Write primary, secondary and subordinate bus numbers */
714 ecam_val = first_busno;
715 ecam_val |= (first_busno + 1) << 8;
716 ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT);
717 writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS));
718
719 if (nwl_pcie_link_up(pcie))
720 dev_info(dev, "Link is UP\n");
721 else
722 dev_info(dev, "Link is DOWN\n");
723
724 /* Get misc IRQ number */
725 pcie->irq_misc = platform_get_irq_byname(pdev, "misc");
726 if (pcie->irq_misc < 0)
727 return -EINVAL;
728
729 err = devm_request_irq(dev, pcie->irq_misc,
730 nwl_pcie_misc_handler, IRQF_SHARED,
731 "nwl_pcie:misc", pcie);
732 if (err) {
733 dev_err(dev, "fail to register misc IRQ#%d\n",
734 pcie->irq_misc);
735 return err;
736 }
737
738 /* Disable all misc interrupts */
739 nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
740
741 /* Clear pending misc interrupts */
742 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
743 MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS);
744
745 /* Enable all misc interrupts */
746 nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
747
748
749 /* Disable all legacy interrupts */
750 nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
751
752 /* Clear pending legacy interrupts */
753 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
754 MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS);
755
756 /* Enable all legacy interrupts */
757 nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
758
759 /* Enable the bridge config interrupt */
760 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) |
761 BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT);
762
763 return 0;
764}
765
766static int nwl_pcie_parse_dt(struct nwl_pcie *pcie,
767 struct platform_device *pdev)
768{
769 struct device *dev = pcie->dev;
770 struct resource *res;
771
772 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
773 pcie->breg_base = devm_ioremap_resource(dev, res);
774 if (IS_ERR(pcie->breg_base))
775 return PTR_ERR(pcie->breg_base);
776 pcie->phys_breg_base = res->start;
777
778 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg");
779 pcie->pcireg_base = devm_ioremap_resource(dev, res);
780 if (IS_ERR(pcie->pcireg_base))
781 return PTR_ERR(pcie->pcireg_base);
782 pcie->phys_pcie_reg_base = res->start;
783
784 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
785 pcie->ecam_base = devm_pci_remap_cfg_resource(dev, res);
786 if (IS_ERR(pcie->ecam_base))
787 return PTR_ERR(pcie->ecam_base);
788 pcie->phys_ecam_base = res->start;
789
790 /* Get intx IRQ number */
791 pcie->irq_intx = platform_get_irq_byname(pdev, "intx");
792 if (pcie->irq_intx < 0)
793 return pcie->irq_intx;
794
795 irq_set_chained_handler_and_data(pcie->irq_intx,
796 nwl_pcie_leg_handler, pcie);
797
798 return 0;
799}
800
801static const struct of_device_id nwl_pcie_of_match[] = {
802 { .compatible = "xlnx,nwl-pcie-2.11", },
803 {}
804};
805
806static int nwl_pcie_probe(struct platform_device *pdev)
807{
808 struct device *dev = &pdev->dev;
809 struct nwl_pcie *pcie;
810 struct pci_host_bridge *bridge;
811 int err;
812
813 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
814 if (!bridge)
815 return -ENODEV;
816
817 pcie = pci_host_bridge_priv(bridge);
818
819 pcie->dev = dev;
820 pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT;
821
822 err = nwl_pcie_parse_dt(pcie, pdev);
823 if (err) {
824 dev_err(dev, "Parsing DT failed\n");
825 return err;
826 }
827
828 err = nwl_pcie_bridge_init(pcie);
829 if (err) {
830 dev_err(dev, "HW Initialization failed\n");
831 return err;
832 }
833
834 err = nwl_pcie_init_irq_domain(pcie);
835 if (err) {
836 dev_err(dev, "Failed creating IRQ Domain\n");
837 return err;
838 }
839
840 bridge->sysdata = pcie;
841 bridge->ops = &nwl_pcie_ops;
842
843 if (IS_ENABLED(CONFIG_PCI_MSI)) {
844 err = nwl_pcie_enable_msi(pcie);
845 if (err < 0) {
846 dev_err(dev, "failed to enable MSI support: %d\n", err);
847 return err;
848 }
849 }
850
851 return pci_host_probe(bridge);
852}
853
854static struct platform_driver nwl_pcie_driver = {
855 .driver = {
856 .name = "nwl-pcie",
857 .suppress_bind_attrs = true,
858 .of_match_table = nwl_pcie_of_match,
859 },
860 .probe = nwl_pcie_probe,
861};
862builtin_platform_driver(nwl_pcie_driver);
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCIe host controller driver for NWL PCIe Bridge
4 * Based on pcie-xilinx.c, pci-tegra.c
5 *
6 * (C) Copyright 2014 - 2015, Xilinx, Inc.
7 */
8
9#include <linux/clk.h>
10#include <linux/delay.h>
11#include <linux/interrupt.h>
12#include <linux/irq.h>
13#include <linux/irqdomain.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/msi.h>
17#include <linux/of_address.h>
18#include <linux/of_pci.h>
19#include <linux/of_platform.h>
20#include <linux/pci.h>
21#include <linux/pci-ecam.h>
22#include <linux/platform_device.h>
23#include <linux/irqchip/chained_irq.h>
24
25#include "../pci.h"
26
27/* Bridge core config registers */
28#define BRCFG_PCIE_RX0 0x00000000
29#define BRCFG_PCIE_RX1 0x00000004
30#define BRCFG_INTERRUPT 0x00000010
31#define BRCFG_PCIE_RX_MSG_FILTER 0x00000020
32
33/* Egress - Bridge translation registers */
34#define E_BREG_CAPABILITIES 0x00000200
35#define E_BREG_CONTROL 0x00000208
36#define E_BREG_BASE_LO 0x00000210
37#define E_BREG_BASE_HI 0x00000214
38#define E_ECAM_CAPABILITIES 0x00000220
39#define E_ECAM_CONTROL 0x00000228
40#define E_ECAM_BASE_LO 0x00000230
41#define E_ECAM_BASE_HI 0x00000234
42
43/* Ingress - address translations */
44#define I_MSII_CAPABILITIES 0x00000300
45#define I_MSII_CONTROL 0x00000308
46#define I_MSII_BASE_LO 0x00000310
47#define I_MSII_BASE_HI 0x00000314
48
49#define I_ISUB_CONTROL 0x000003E8
50#define SET_ISUB_CONTROL BIT(0)
51/* Rxed msg fifo - Interrupt status registers */
52#define MSGF_MISC_STATUS 0x00000400
53#define MSGF_MISC_MASK 0x00000404
54#define MSGF_LEG_STATUS 0x00000420
55#define MSGF_LEG_MASK 0x00000424
56#define MSGF_MSI_STATUS_LO 0x00000440
57#define MSGF_MSI_STATUS_HI 0x00000444
58#define MSGF_MSI_MASK_LO 0x00000448
59#define MSGF_MSI_MASK_HI 0x0000044C
60
61/* Msg filter mask bits */
62#define CFG_ENABLE_PM_MSG_FWD BIT(1)
63#define CFG_ENABLE_INT_MSG_FWD BIT(2)
64#define CFG_ENABLE_ERR_MSG_FWD BIT(3)
65#define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \
66 CFG_ENABLE_INT_MSG_FWD | \
67 CFG_ENABLE_ERR_MSG_FWD)
68
69/* Misc interrupt status mask bits */
70#define MSGF_MISC_SR_RXMSG_AVAIL BIT(0)
71#define MSGF_MISC_SR_RXMSG_OVER BIT(1)
72#define MSGF_MISC_SR_SLAVE_ERR BIT(4)
73#define MSGF_MISC_SR_MASTER_ERR BIT(5)
74#define MSGF_MISC_SR_I_ADDR_ERR BIT(6)
75#define MSGF_MISC_SR_E_ADDR_ERR BIT(7)
76#define MSGF_MISC_SR_FATAL_AER BIT(16)
77#define MSGF_MISC_SR_NON_FATAL_AER BIT(17)
78#define MSGF_MISC_SR_CORR_AER BIT(18)
79#define MSGF_MISC_SR_UR_DETECT BIT(20)
80#define MSGF_MISC_SR_NON_FATAL_DEV BIT(22)
81#define MSGF_MISC_SR_FATAL_DEV BIT(23)
82#define MSGF_MISC_SR_LINK_DOWN BIT(24)
83#define MSGF_MSIC_SR_LINK_AUTO_BWIDTH BIT(25)
84#define MSGF_MSIC_SR_LINK_BWIDTH BIT(26)
85
86#define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \
87 MSGF_MISC_SR_RXMSG_OVER | \
88 MSGF_MISC_SR_SLAVE_ERR | \
89 MSGF_MISC_SR_MASTER_ERR | \
90 MSGF_MISC_SR_I_ADDR_ERR | \
91 MSGF_MISC_SR_E_ADDR_ERR | \
92 MSGF_MISC_SR_FATAL_AER | \
93 MSGF_MISC_SR_NON_FATAL_AER | \
94 MSGF_MISC_SR_CORR_AER | \
95 MSGF_MISC_SR_UR_DETECT | \
96 MSGF_MISC_SR_NON_FATAL_DEV | \
97 MSGF_MISC_SR_FATAL_DEV | \
98 MSGF_MISC_SR_LINK_DOWN | \
99 MSGF_MSIC_SR_LINK_AUTO_BWIDTH | \
100 MSGF_MSIC_SR_LINK_BWIDTH)
101
102/* Legacy interrupt status mask bits */
103#define MSGF_LEG_SR_INTA BIT(0)
104#define MSGF_LEG_SR_INTB BIT(1)
105#define MSGF_LEG_SR_INTC BIT(2)
106#define MSGF_LEG_SR_INTD BIT(3)
107#define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \
108 MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD)
109
110/* MSI interrupt status mask bits */
111#define MSGF_MSI_SR_LO_MASK GENMASK(31, 0)
112#define MSGF_MSI_SR_HI_MASK GENMASK(31, 0)
113
114#define MSII_PRESENT BIT(0)
115#define MSII_ENABLE BIT(0)
116#define MSII_STATUS_ENABLE BIT(15)
117
118/* Bridge config interrupt mask */
119#define BRCFG_INTERRUPT_MASK BIT(0)
120#define BREG_PRESENT BIT(0)
121#define BREG_ENABLE BIT(0)
122#define BREG_ENABLE_FORCE BIT(1)
123
124/* E_ECAM status mask bits */
125#define E_ECAM_PRESENT BIT(0)
126#define E_ECAM_CR_ENABLE BIT(0)
127#define E_ECAM_SIZE_LOC GENMASK(20, 16)
128#define E_ECAM_SIZE_SHIFT 16
129#define NWL_ECAM_VALUE_DEFAULT 12
130
131#define CFG_DMA_REG_BAR GENMASK(2, 0)
132#define CFG_PCIE_CACHE GENMASK(7, 0)
133
134#define INT_PCI_MSI_NR (2 * 32)
135
136/* Readin the PS_LINKUP */
137#define PS_LINKUP_OFFSET 0x00000238
138#define PCIE_PHY_LINKUP_BIT BIT(0)
139#define PHY_RDY_LINKUP_BIT BIT(1)
140
141/* Parameters for the waiting for link up routine */
142#define LINK_WAIT_MAX_RETRIES 10
143#define LINK_WAIT_USLEEP_MIN 90000
144#define LINK_WAIT_USLEEP_MAX 100000
145
146struct nwl_msi { /* MSI information */
147 struct irq_domain *msi_domain;
148 DECLARE_BITMAP(bitmap, INT_PCI_MSI_NR);
149 struct irq_domain *dev_domain;
150 struct mutex lock; /* protect bitmap variable */
151 int irq_msi0;
152 int irq_msi1;
153};
154
155struct nwl_pcie {
156 struct device *dev;
157 void __iomem *breg_base;
158 void __iomem *pcireg_base;
159 void __iomem *ecam_base;
160 phys_addr_t phys_breg_base; /* Physical Bridge Register Base */
161 phys_addr_t phys_pcie_reg_base; /* Physical PCIe Controller Base */
162 phys_addr_t phys_ecam_base; /* Physical Configuration Base */
163 u32 breg_size;
164 u32 pcie_reg_size;
165 u32 ecam_size;
166 int irq_intx;
167 int irq_misc;
168 u32 ecam_value;
169 u8 last_busno;
170 struct nwl_msi msi;
171 struct irq_domain *legacy_irq_domain;
172 struct clk *clk;
173 raw_spinlock_t leg_mask_lock;
174};
175
176static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off)
177{
178 return readl(pcie->breg_base + off);
179}
180
181static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off)
182{
183 writel(val, pcie->breg_base + off);
184}
185
186static bool nwl_pcie_link_up(struct nwl_pcie *pcie)
187{
188 if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PCIE_PHY_LINKUP_BIT)
189 return true;
190 return false;
191}
192
193static bool nwl_phy_link_up(struct nwl_pcie *pcie)
194{
195 if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PHY_RDY_LINKUP_BIT)
196 return true;
197 return false;
198}
199
200static int nwl_wait_for_link(struct nwl_pcie *pcie)
201{
202 struct device *dev = pcie->dev;
203 int retries;
204
205 /* check if the link is up or not */
206 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
207 if (nwl_phy_link_up(pcie))
208 return 0;
209 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
210 }
211
212 dev_err(dev, "PHY link never came up\n");
213 return -ETIMEDOUT;
214}
215
216static bool nwl_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
217{
218 struct nwl_pcie *pcie = bus->sysdata;
219
220 /* Check link before accessing downstream ports */
221 if (!pci_is_root_bus(bus)) {
222 if (!nwl_pcie_link_up(pcie))
223 return false;
224 } else if (devfn > 0)
225 /* Only one device down on each root port */
226 return false;
227
228 return true;
229}
230
231/**
232 * nwl_pcie_map_bus - Get configuration base
233 *
234 * @bus: Bus structure of current bus
235 * @devfn: Device/function
236 * @where: Offset from base
237 *
238 * Return: Base address of the configuration space needed to be
239 * accessed.
240 */
241static void __iomem *nwl_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
242 int where)
243{
244 struct nwl_pcie *pcie = bus->sysdata;
245
246 if (!nwl_pcie_valid_device(bus, devfn))
247 return NULL;
248
249 return pcie->ecam_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
250}
251
252/* PCIe operations */
253static struct pci_ops nwl_pcie_ops = {
254 .map_bus = nwl_pcie_map_bus,
255 .read = pci_generic_config_read,
256 .write = pci_generic_config_write,
257};
258
259static irqreturn_t nwl_pcie_misc_handler(int irq, void *data)
260{
261 struct nwl_pcie *pcie = data;
262 struct device *dev = pcie->dev;
263 u32 misc_stat;
264
265 /* Checking for misc interrupts */
266 misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
267 MSGF_MISC_SR_MASKALL;
268 if (!misc_stat)
269 return IRQ_NONE;
270
271 if (misc_stat & MSGF_MISC_SR_RXMSG_OVER)
272 dev_err(dev, "Received Message FIFO Overflow\n");
273
274 if (misc_stat & MSGF_MISC_SR_SLAVE_ERR)
275 dev_err(dev, "Slave error\n");
276
277 if (misc_stat & MSGF_MISC_SR_MASTER_ERR)
278 dev_err(dev, "Master error\n");
279
280 if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR)
281 dev_err(dev, "In Misc Ingress address translation error\n");
282
283 if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR)
284 dev_err(dev, "In Misc Egress address translation error\n");
285
286 if (misc_stat & MSGF_MISC_SR_FATAL_AER)
287 dev_err(dev, "Fatal Error in AER Capability\n");
288
289 if (misc_stat & MSGF_MISC_SR_NON_FATAL_AER)
290 dev_err(dev, "Non-Fatal Error in AER Capability\n");
291
292 if (misc_stat & MSGF_MISC_SR_CORR_AER)
293 dev_err(dev, "Correctable Error in AER Capability\n");
294
295 if (misc_stat & MSGF_MISC_SR_UR_DETECT)
296 dev_err(dev, "Unsupported request Detected\n");
297
298 if (misc_stat & MSGF_MISC_SR_NON_FATAL_DEV)
299 dev_err(dev, "Non-Fatal Error Detected\n");
300
301 if (misc_stat & MSGF_MISC_SR_FATAL_DEV)
302 dev_err(dev, "Fatal Error Detected\n");
303
304 if (misc_stat & MSGF_MSIC_SR_LINK_AUTO_BWIDTH)
305 dev_info(dev, "Link Autonomous Bandwidth Management Status bit set\n");
306
307 if (misc_stat & MSGF_MSIC_SR_LINK_BWIDTH)
308 dev_info(dev, "Link Bandwidth Management Status bit set\n");
309
310 /* Clear misc interrupt status */
311 nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS);
312
313 return IRQ_HANDLED;
314}
315
316static void nwl_pcie_leg_handler(struct irq_desc *desc)
317{
318 struct irq_chip *chip = irq_desc_get_chip(desc);
319 struct nwl_pcie *pcie;
320 unsigned long status;
321 u32 bit;
322
323 chained_irq_enter(chip, desc);
324 pcie = irq_desc_get_handler_data(desc);
325
326 while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
327 MSGF_LEG_SR_MASKALL) != 0) {
328 for_each_set_bit(bit, &status, PCI_NUM_INTX)
329 generic_handle_domain_irq(pcie->legacy_irq_domain, bit);
330 }
331
332 chained_irq_exit(chip, desc);
333}
334
335static void nwl_pcie_handle_msi_irq(struct nwl_pcie *pcie, u32 status_reg)
336{
337 struct nwl_msi *msi = &pcie->msi;
338 unsigned long status;
339 u32 bit;
340
341 while ((status = nwl_bridge_readl(pcie, status_reg)) != 0) {
342 for_each_set_bit(bit, &status, 32) {
343 nwl_bridge_writel(pcie, 1 << bit, status_reg);
344 generic_handle_domain_irq(msi->dev_domain, bit);
345 }
346 }
347}
348
349static void nwl_pcie_msi_handler_high(struct irq_desc *desc)
350{
351 struct irq_chip *chip = irq_desc_get_chip(desc);
352 struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
353
354 chained_irq_enter(chip, desc);
355 nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_HI);
356 chained_irq_exit(chip, desc);
357}
358
359static void nwl_pcie_msi_handler_low(struct irq_desc *desc)
360{
361 struct irq_chip *chip = irq_desc_get_chip(desc);
362 struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
363
364 chained_irq_enter(chip, desc);
365 nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_LO);
366 chained_irq_exit(chip, desc);
367}
368
369static void nwl_mask_leg_irq(struct irq_data *data)
370{
371 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
372 unsigned long flags;
373 u32 mask;
374 u32 val;
375
376 mask = 1 << (data->hwirq - 1);
377 raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
378 val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
379 nwl_bridge_writel(pcie, (val & (~mask)), MSGF_LEG_MASK);
380 raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
381}
382
383static void nwl_unmask_leg_irq(struct irq_data *data)
384{
385 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
386 unsigned long flags;
387 u32 mask;
388 u32 val;
389
390 mask = 1 << (data->hwirq - 1);
391 raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
392 val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
393 nwl_bridge_writel(pcie, (val | mask), MSGF_LEG_MASK);
394 raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
395}
396
397static struct irq_chip nwl_leg_irq_chip = {
398 .name = "nwl_pcie:legacy",
399 .irq_enable = nwl_unmask_leg_irq,
400 .irq_disable = nwl_mask_leg_irq,
401 .irq_mask = nwl_mask_leg_irq,
402 .irq_unmask = nwl_unmask_leg_irq,
403};
404
405static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq,
406 irq_hw_number_t hwirq)
407{
408 irq_set_chip_and_handler(irq, &nwl_leg_irq_chip, handle_level_irq);
409 irq_set_chip_data(irq, domain->host_data);
410 irq_set_status_flags(irq, IRQ_LEVEL);
411
412 return 0;
413}
414
415static const struct irq_domain_ops legacy_domain_ops = {
416 .map = nwl_legacy_map,
417 .xlate = pci_irqd_intx_xlate,
418};
419
420#ifdef CONFIG_PCI_MSI
421static struct irq_chip nwl_msi_irq_chip = {
422 .name = "nwl_pcie:msi",
423 .irq_enable = pci_msi_unmask_irq,
424 .irq_disable = pci_msi_mask_irq,
425 .irq_mask = pci_msi_mask_irq,
426 .irq_unmask = pci_msi_unmask_irq,
427};
428
429static struct msi_domain_info nwl_msi_domain_info = {
430 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
431 MSI_FLAG_MULTI_PCI_MSI),
432 .chip = &nwl_msi_irq_chip,
433};
434#endif
435
436static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
437{
438 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
439 phys_addr_t msi_addr = pcie->phys_pcie_reg_base;
440
441 msg->address_lo = lower_32_bits(msi_addr);
442 msg->address_hi = upper_32_bits(msi_addr);
443 msg->data = data->hwirq;
444}
445
446static int nwl_msi_set_affinity(struct irq_data *irq_data,
447 const struct cpumask *mask, bool force)
448{
449 return -EINVAL;
450}
451
452static struct irq_chip nwl_irq_chip = {
453 .name = "Xilinx MSI",
454 .irq_compose_msi_msg = nwl_compose_msi_msg,
455 .irq_set_affinity = nwl_msi_set_affinity,
456};
457
458static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
459 unsigned int nr_irqs, void *args)
460{
461 struct nwl_pcie *pcie = domain->host_data;
462 struct nwl_msi *msi = &pcie->msi;
463 int bit;
464 int i;
465
466 mutex_lock(&msi->lock);
467 bit = bitmap_find_free_region(msi->bitmap, INT_PCI_MSI_NR,
468 get_count_order(nr_irqs));
469 if (bit < 0) {
470 mutex_unlock(&msi->lock);
471 return -ENOSPC;
472 }
473
474 for (i = 0; i < nr_irqs; i++) {
475 irq_domain_set_info(domain, virq + i, bit + i, &nwl_irq_chip,
476 domain->host_data, handle_simple_irq,
477 NULL, NULL);
478 }
479 mutex_unlock(&msi->lock);
480 return 0;
481}
482
483static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq,
484 unsigned int nr_irqs)
485{
486 struct irq_data *data = irq_domain_get_irq_data(domain, virq);
487 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
488 struct nwl_msi *msi = &pcie->msi;
489
490 mutex_lock(&msi->lock);
491 bitmap_release_region(msi->bitmap, data->hwirq,
492 get_count_order(nr_irqs));
493 mutex_unlock(&msi->lock);
494}
495
496static const struct irq_domain_ops dev_msi_domain_ops = {
497 .alloc = nwl_irq_domain_alloc,
498 .free = nwl_irq_domain_free,
499};
500
501static int nwl_pcie_init_msi_irq_domain(struct nwl_pcie *pcie)
502{
503#ifdef CONFIG_PCI_MSI
504 struct device *dev = pcie->dev;
505 struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
506 struct nwl_msi *msi = &pcie->msi;
507
508 msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR,
509 &dev_msi_domain_ops, pcie);
510 if (!msi->dev_domain) {
511 dev_err(dev, "failed to create dev IRQ domain\n");
512 return -ENOMEM;
513 }
514 msi->msi_domain = pci_msi_create_irq_domain(fwnode,
515 &nwl_msi_domain_info,
516 msi->dev_domain);
517 if (!msi->msi_domain) {
518 dev_err(dev, "failed to create msi IRQ domain\n");
519 irq_domain_remove(msi->dev_domain);
520 return -ENOMEM;
521 }
522#endif
523 return 0;
524}
525
526static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie)
527{
528 struct device *dev = pcie->dev;
529 struct device_node *node = dev->of_node;
530 struct device_node *legacy_intc_node;
531
532 legacy_intc_node = of_get_next_child(node, NULL);
533 if (!legacy_intc_node) {
534 dev_err(dev, "No legacy intc node found\n");
535 return -EINVAL;
536 }
537
538 pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node,
539 PCI_NUM_INTX,
540 &legacy_domain_ops,
541 pcie);
542 of_node_put(legacy_intc_node);
543 if (!pcie->legacy_irq_domain) {
544 dev_err(dev, "failed to create IRQ domain\n");
545 return -ENOMEM;
546 }
547
548 raw_spin_lock_init(&pcie->leg_mask_lock);
549 nwl_pcie_init_msi_irq_domain(pcie);
550 return 0;
551}
552
553static int nwl_pcie_enable_msi(struct nwl_pcie *pcie)
554{
555 struct device *dev = pcie->dev;
556 struct platform_device *pdev = to_platform_device(dev);
557 struct nwl_msi *msi = &pcie->msi;
558 unsigned long base;
559 int ret;
560
561 mutex_init(&msi->lock);
562
563 /* Get msi_1 IRQ number */
564 msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1");
565 if (msi->irq_msi1 < 0)
566 return -EINVAL;
567
568 irq_set_chained_handler_and_data(msi->irq_msi1,
569 nwl_pcie_msi_handler_high, pcie);
570
571 /* Get msi_0 IRQ number */
572 msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0");
573 if (msi->irq_msi0 < 0)
574 return -EINVAL;
575
576 irq_set_chained_handler_and_data(msi->irq_msi0,
577 nwl_pcie_msi_handler_low, pcie);
578
579 /* Check for msii_present bit */
580 ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT;
581 if (!ret) {
582 dev_err(dev, "MSI not present\n");
583 return -EIO;
584 }
585
586 /* Enable MSII */
587 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
588 MSII_ENABLE, I_MSII_CONTROL);
589
590 /* Enable MSII status */
591 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
592 MSII_STATUS_ENABLE, I_MSII_CONTROL);
593
594 /* setup AFI/FPCI range */
595 base = pcie->phys_pcie_reg_base;
596 nwl_bridge_writel(pcie, lower_32_bits(base), I_MSII_BASE_LO);
597 nwl_bridge_writel(pcie, upper_32_bits(base), I_MSII_BASE_HI);
598
599 /*
600 * For high range MSI interrupts: disable, clear any pending,
601 * and enable
602 */
603 nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_HI);
604
605 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) &
606 MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI);
607
608 nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI);
609
610 /*
611 * For low range MSI interrupts: disable, clear any pending,
612 * and enable
613 */
614 nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_LO);
615
616 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) &
617 MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO);
618
619 nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO);
620
621 return 0;
622}
623
624static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
625{
626 struct device *dev = pcie->dev;
627 struct platform_device *pdev = to_platform_device(dev);
628 u32 breg_val, ecam_val, first_busno = 0;
629 int err;
630
631 breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT;
632 if (!breg_val) {
633 dev_err(dev, "BREG is not present\n");
634 return breg_val;
635 }
636
637 /* Write bridge_off to breg base */
638 nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_breg_base),
639 E_BREG_BASE_LO);
640 nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_breg_base),
641 E_BREG_BASE_HI);
642
643 /* Enable BREG */
644 nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE,
645 E_BREG_CONTROL);
646
647 /* Disable DMA channel registers */
648 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) |
649 CFG_DMA_REG_BAR, BRCFG_PCIE_RX0);
650
651 /* Enable Ingress subtractive decode translation */
652 nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL);
653
654 /* Enable msg filtering details */
655 nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK,
656 BRCFG_PCIE_RX_MSG_FILTER);
657
658 /* This routes the PCIe DMA traffic to go through CCI path */
659 if (of_dma_is_coherent(dev->of_node))
660 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX1) |
661 CFG_PCIE_CACHE, BRCFG_PCIE_RX1);
662
663 err = nwl_wait_for_link(pcie);
664 if (err)
665 return err;
666
667 ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT;
668 if (!ecam_val) {
669 dev_err(dev, "ECAM is not present\n");
670 return ecam_val;
671 }
672
673 /* Enable ECAM */
674 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
675 E_ECAM_CR_ENABLE, E_ECAM_CONTROL);
676
677 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
678 (pcie->ecam_value << E_ECAM_SIZE_SHIFT),
679 E_ECAM_CONTROL);
680
681 nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_ecam_base),
682 E_ECAM_BASE_LO);
683 nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_ecam_base),
684 E_ECAM_BASE_HI);
685
686 /* Get bus range */
687 ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL);
688 pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT;
689 /* Write primary, secondary and subordinate bus numbers */
690 ecam_val = first_busno;
691 ecam_val |= (first_busno + 1) << 8;
692 ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT);
693 writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS));
694
695 if (nwl_pcie_link_up(pcie))
696 dev_info(dev, "Link is UP\n");
697 else
698 dev_info(dev, "Link is DOWN\n");
699
700 /* Get misc IRQ number */
701 pcie->irq_misc = platform_get_irq_byname(pdev, "misc");
702 if (pcie->irq_misc < 0)
703 return -EINVAL;
704
705 err = devm_request_irq(dev, pcie->irq_misc,
706 nwl_pcie_misc_handler, IRQF_SHARED,
707 "nwl_pcie:misc", pcie);
708 if (err) {
709 dev_err(dev, "fail to register misc IRQ#%d\n",
710 pcie->irq_misc);
711 return err;
712 }
713
714 /* Disable all misc interrupts */
715 nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
716
717 /* Clear pending misc interrupts */
718 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
719 MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS);
720
721 /* Enable all misc interrupts */
722 nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
723
724 /* Disable all legacy interrupts */
725 nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
726
727 /* Clear pending legacy interrupts */
728 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
729 MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS);
730
731 /* Enable all legacy interrupts */
732 nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
733
734 /* Enable the bridge config interrupt */
735 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) |
736 BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT);
737
738 return 0;
739}
740
741static int nwl_pcie_parse_dt(struct nwl_pcie *pcie,
742 struct platform_device *pdev)
743{
744 struct device *dev = pcie->dev;
745 struct resource *res;
746
747 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
748 pcie->breg_base = devm_ioremap_resource(dev, res);
749 if (IS_ERR(pcie->breg_base))
750 return PTR_ERR(pcie->breg_base);
751 pcie->phys_breg_base = res->start;
752
753 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg");
754 pcie->pcireg_base = devm_ioremap_resource(dev, res);
755 if (IS_ERR(pcie->pcireg_base))
756 return PTR_ERR(pcie->pcireg_base);
757 pcie->phys_pcie_reg_base = res->start;
758
759 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
760 pcie->ecam_base = devm_pci_remap_cfg_resource(dev, res);
761 if (IS_ERR(pcie->ecam_base))
762 return PTR_ERR(pcie->ecam_base);
763 pcie->phys_ecam_base = res->start;
764
765 /* Get intx IRQ number */
766 pcie->irq_intx = platform_get_irq_byname(pdev, "intx");
767 if (pcie->irq_intx < 0)
768 return pcie->irq_intx;
769
770 irq_set_chained_handler_and_data(pcie->irq_intx,
771 nwl_pcie_leg_handler, pcie);
772
773 return 0;
774}
775
776static const struct of_device_id nwl_pcie_of_match[] = {
777 { .compatible = "xlnx,nwl-pcie-2.11", },
778 {}
779};
780
781static int nwl_pcie_probe(struct platform_device *pdev)
782{
783 struct device *dev = &pdev->dev;
784 struct nwl_pcie *pcie;
785 struct pci_host_bridge *bridge;
786 int err;
787
788 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
789 if (!bridge)
790 return -ENODEV;
791
792 pcie = pci_host_bridge_priv(bridge);
793
794 pcie->dev = dev;
795 pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT;
796
797 err = nwl_pcie_parse_dt(pcie, pdev);
798 if (err) {
799 dev_err(dev, "Parsing DT failed\n");
800 return err;
801 }
802
803 pcie->clk = devm_clk_get(dev, NULL);
804 if (IS_ERR(pcie->clk))
805 return PTR_ERR(pcie->clk);
806
807 err = clk_prepare_enable(pcie->clk);
808 if (err) {
809 dev_err(dev, "can't enable PCIe ref clock\n");
810 return err;
811 }
812
813 err = nwl_pcie_bridge_init(pcie);
814 if (err) {
815 dev_err(dev, "HW Initialization failed\n");
816 return err;
817 }
818
819 err = nwl_pcie_init_irq_domain(pcie);
820 if (err) {
821 dev_err(dev, "Failed creating IRQ Domain\n");
822 return err;
823 }
824
825 bridge->sysdata = pcie;
826 bridge->ops = &nwl_pcie_ops;
827
828 if (IS_ENABLED(CONFIG_PCI_MSI)) {
829 err = nwl_pcie_enable_msi(pcie);
830 if (err < 0) {
831 dev_err(dev, "failed to enable MSI support: %d\n", err);
832 return err;
833 }
834 }
835
836 return pci_host_probe(bridge);
837}
838
839static struct platform_driver nwl_pcie_driver = {
840 .driver = {
841 .name = "nwl-pcie",
842 .suppress_bind_attrs = true,
843 .of_match_table = nwl_pcie_of_match,
844 },
845 .probe = nwl_pcie_probe,
846};
847builtin_platform_driver(nwl_pcie_driver);