tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Synopsys Designware PCIe host controller driver
3 *
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
6 *
7 * Author: Jingoo Han <jg1.han@samsung.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/irq.h>
15#include <linux/irqdomain.h>
16#include <linux/kernel.h>
17#include <linux/msi.h>
18#include <linux/of_address.h>
19#include <linux/of_pci.h>
20#include <linux/pci.h>
21#include <linux/pci_regs.h>
22#include <linux/platform_device.h>
23#include <linux/types.h>
24#include <linux/delay.h>
25
26#include "pcie-designware.h"
27
28/* Parameters for the waiting for link up routine */
29#define LINK_WAIT_MAX_RETRIES 10
30#define LINK_WAIT_USLEEP_MIN 90000
31#define LINK_WAIT_USLEEP_MAX 100000
32
33/* Parameters for the waiting for iATU enabled routine */
34#define LINK_WAIT_MAX_IATU_RETRIES 5
35#define LINK_WAIT_IATU_MIN 9000
36#define LINK_WAIT_IATU_MAX 10000
37
38/* Synopsys-specific PCIe configuration registers */
39#define PCIE_PORT_LINK_CONTROL 0x710
40#define PORT_LINK_MODE_MASK (0x3f << 16)
41#define PORT_LINK_MODE_1_LANES (0x1 << 16)
42#define PORT_LINK_MODE_2_LANES (0x3 << 16)
43#define PORT_LINK_MODE_4_LANES (0x7 << 16)
44#define PORT_LINK_MODE_8_LANES (0xf << 16)
45
46#define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
47#define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
48#define PORT_LOGIC_LINK_WIDTH_MASK (0x1f << 8)
49#define PORT_LOGIC_LINK_WIDTH_1_LANES (0x1 << 8)
50#define PORT_LOGIC_LINK_WIDTH_2_LANES (0x2 << 8)
51#define PORT_LOGIC_LINK_WIDTH_4_LANES (0x4 << 8)
52#define PORT_LOGIC_LINK_WIDTH_8_LANES (0x8 << 8)
53
54#define PCIE_MSI_ADDR_LO 0x820
55#define PCIE_MSI_ADDR_HI 0x824
56#define PCIE_MSI_INTR0_ENABLE 0x828
57#define PCIE_MSI_INTR0_MASK 0x82C
58#define PCIE_MSI_INTR0_STATUS 0x830
59
60#define PCIE_ATU_VIEWPORT 0x900
61#define PCIE_ATU_REGION_INBOUND (0x1 << 31)
62#define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
63#define PCIE_ATU_REGION_INDEX2 (0x2 << 0)
64#define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
65#define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
66#define PCIE_ATU_CR1 0x904
67#define PCIE_ATU_TYPE_MEM (0x0 << 0)
68#define PCIE_ATU_TYPE_IO (0x2 << 0)
69#define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
70#define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
71#define PCIE_ATU_CR2 0x908
72#define PCIE_ATU_ENABLE (0x1 << 31)
73#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
74#define PCIE_ATU_LOWER_BASE 0x90C
75#define PCIE_ATU_UPPER_BASE 0x910
76#define PCIE_ATU_LIMIT 0x914
77#define PCIE_ATU_LOWER_TARGET 0x918
78#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
79#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
80#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
81#define PCIE_ATU_UPPER_TARGET 0x91C
82
83/*
84 * iATU Unroll-specific register definitions
85 * From 4.80 core version the address translation will be made by unroll
86 */
87#define PCIE_ATU_UNR_REGION_CTRL1 0x00
88#define PCIE_ATU_UNR_REGION_CTRL2 0x04
89#define PCIE_ATU_UNR_LOWER_BASE 0x08
90#define PCIE_ATU_UNR_UPPER_BASE 0x0C
91#define PCIE_ATU_UNR_LIMIT 0x10
92#define PCIE_ATU_UNR_LOWER_TARGET 0x14
93#define PCIE_ATU_UNR_UPPER_TARGET 0x18
94
95/* Register address builder */
96#define PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(region) ((0x3 << 20) | (region << 9))
97
98/* PCIe Port Logic registers */
99#define PLR_OFFSET 0x700
100#define PCIE_PHY_DEBUG_R1 (PLR_OFFSET + 0x2c)
101#define PCIE_PHY_DEBUG_R1_LINK_UP (0x1 << 4)
102#define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (0x1 << 29)
103
104static struct pci_ops dw_pcie_ops;
105
106int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val)
107{
108 if ((uintptr_t)addr & (size - 1)) {
109 *val = 0;
110 return PCIBIOS_BAD_REGISTER_NUMBER;
111 }
112
113 if (size == 4)
114 *val = readl(addr);
115 else if (size == 2)
116 *val = readw(addr);
117 else if (size == 1)
118 *val = readb(addr);
119 else {
120 *val = 0;
121 return PCIBIOS_BAD_REGISTER_NUMBER;
122 }
123
124 return PCIBIOS_SUCCESSFUL;
125}
126
127int dw_pcie_cfg_write(void __iomem *addr, int size, u32 val)
128{
129 if ((uintptr_t)addr & (size - 1))
130 return PCIBIOS_BAD_REGISTER_NUMBER;
131
132 if (size == 4)
133 writel(val, addr);
134 else if (size == 2)
135 writew(val, addr);
136 else if (size == 1)
137 writeb(val, addr);
138 else
139 return PCIBIOS_BAD_REGISTER_NUMBER;
140
141 return PCIBIOS_SUCCESSFUL;
142}
143
144u32 dw_pcie_readl_rc(struct pcie_port *pp, u32 reg)
145{
146 if (pp->ops->readl_rc)
147 return pp->ops->readl_rc(pp, reg);
148
149 return readl(pp->dbi_base + reg);
150}
151
152void dw_pcie_writel_rc(struct pcie_port *pp, u32 reg, u32 val)
153{
154 if (pp->ops->writel_rc)
155 pp->ops->writel_rc(pp, reg, val);
156 else
157 writel(val, pp->dbi_base + reg);
158}
159
160static u32 dw_pcie_readl_unroll(struct pcie_port *pp, u32 index, u32 reg)
161{
162 u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
163
164 return dw_pcie_readl_rc(pp, offset + reg);
165}
166
167static void dw_pcie_writel_unroll(struct pcie_port *pp, u32 index, u32 reg,
168 u32 val)
169{
170 u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
171
172 dw_pcie_writel_rc(pp, offset + reg, val);
173}
174
175static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
176 u32 *val)
177{
178 if (pp->ops->rd_own_conf)
179 return pp->ops->rd_own_conf(pp, where, size, val);
180
181 return dw_pcie_cfg_read(pp->dbi_base + where, size, val);
182}
183
184static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
185 u32 val)
186{
187 if (pp->ops->wr_own_conf)
188 return pp->ops->wr_own_conf(pp, where, size, val);
189
190 return dw_pcie_cfg_write(pp->dbi_base + where, size, val);
191}
192
193static void dw_pcie_prog_outbound_atu(struct pcie_port *pp, int index,
194 int type, u64 cpu_addr, u64 pci_addr, u32 size)
195{
196 u32 retries, val;
197
198 if (pp->iatu_unroll_enabled) {
199 dw_pcie_writel_unroll(pp, index, PCIE_ATU_UNR_LOWER_BASE,
200 lower_32_bits(cpu_addr));
201 dw_pcie_writel_unroll(pp, index, PCIE_ATU_UNR_UPPER_BASE,
202 upper_32_bits(cpu_addr));
203 dw_pcie_writel_unroll(pp, index, PCIE_ATU_UNR_LIMIT,
204 lower_32_bits(cpu_addr + size - 1));
205 dw_pcie_writel_unroll(pp, index, PCIE_ATU_UNR_LOWER_TARGET,
206 lower_32_bits(pci_addr));
207 dw_pcie_writel_unroll(pp, index, PCIE_ATU_UNR_UPPER_TARGET,
208 upper_32_bits(pci_addr));
209 dw_pcie_writel_unroll(pp, index, PCIE_ATU_UNR_REGION_CTRL1,
210 type);
211 dw_pcie_writel_unroll(pp, index, PCIE_ATU_UNR_REGION_CTRL2,
212 PCIE_ATU_ENABLE);
213 } else {
214 dw_pcie_writel_rc(pp, PCIE_ATU_VIEWPORT,
215 PCIE_ATU_REGION_OUTBOUND | index);
216 dw_pcie_writel_rc(pp, PCIE_ATU_LOWER_BASE,
217 lower_32_bits(cpu_addr));
218 dw_pcie_writel_rc(pp, PCIE_ATU_UPPER_BASE,
219 upper_32_bits(cpu_addr));
220 dw_pcie_writel_rc(pp, PCIE_ATU_LIMIT,
221 lower_32_bits(cpu_addr + size - 1));
222 dw_pcie_writel_rc(pp, PCIE_ATU_LOWER_TARGET,
223 lower_32_bits(pci_addr));
224 dw_pcie_writel_rc(pp, PCIE_ATU_UPPER_TARGET,
225 upper_32_bits(pci_addr));
226 dw_pcie_writel_rc(pp, PCIE_ATU_CR1, type);
227 dw_pcie_writel_rc(pp, PCIE_ATU_CR2, PCIE_ATU_ENABLE);
228 }
229
230 /*
231 * Make sure ATU enable takes effect before any subsequent config
232 * and I/O accesses.
233 */
234 for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
235 if (pp->iatu_unroll_enabled)
236 val = dw_pcie_readl_unroll(pp, index,
237 PCIE_ATU_UNR_REGION_CTRL2);
238 else
239 val = dw_pcie_readl_rc(pp, PCIE_ATU_CR2);
240
241 if (val == PCIE_ATU_ENABLE)
242 return;
243
244 usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
245 }
246 dev_err(pp->dev, "iATU is not being enabled\n");
247}
248
249static struct irq_chip dw_msi_irq_chip = {
250 .name = "PCI-MSI",
251 .irq_enable = pci_msi_unmask_irq,
252 .irq_disable = pci_msi_mask_irq,
253 .irq_mask = pci_msi_mask_irq,
254 .irq_unmask = pci_msi_unmask_irq,
255};
256
257/* MSI int handler */
258irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
259{
260 unsigned long val;
261 int i, pos, irq;
262 irqreturn_t ret = IRQ_NONE;
263
264 for (i = 0; i < MAX_MSI_CTRLS; i++) {
265 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
266 (u32 *)&val);
267 if (val) {
268 ret = IRQ_HANDLED;
269 pos = 0;
270 while ((pos = find_next_bit(&val, 32, pos)) != 32) {
271 irq = irq_find_mapping(pp->irq_domain,
272 i * 32 + pos);
273 dw_pcie_wr_own_conf(pp,
274 PCIE_MSI_INTR0_STATUS + i * 12,
275 4, 1 << pos);
276 generic_handle_irq(irq);
277 pos++;
278 }
279 }
280 }
281
282 return ret;
283}
284
285void dw_pcie_msi_init(struct pcie_port *pp)
286{
287 u64 msi_target;
288
289 pp->msi_data = __get_free_pages(GFP_KERNEL, 0);
290 msi_target = virt_to_phys((void *)pp->msi_data);
291
292 /* program the msi_data */
293 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
294 (u32)(msi_target & 0xffffffff));
295 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
296 (u32)(msi_target >> 32 & 0xffffffff));
297}
298
299static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
300{
301 unsigned int res, bit, val;
302
303 res = (irq / 32) * 12;
304 bit = irq % 32;
305 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
306 val &= ~(1 << bit);
307 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
308}
309
310static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
311 unsigned int nvec, unsigned int pos)
312{
313 unsigned int i;
314
315 for (i = 0; i < nvec; i++) {
316 irq_set_msi_desc_off(irq_base, i, NULL);
317 /* Disable corresponding interrupt on MSI controller */
318 if (pp->ops->msi_clear_irq)
319 pp->ops->msi_clear_irq(pp, pos + i);
320 else
321 dw_pcie_msi_clear_irq(pp, pos + i);
322 }
323
324 bitmap_release_region(pp->msi_irq_in_use, pos, order_base_2(nvec));
325}
326
327static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
328{
329 unsigned int res, bit, val;
330
331 res = (irq / 32) * 12;
332 bit = irq % 32;
333 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
334 val |= 1 << bit;
335 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
336}
337
338static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
339{
340 int irq, pos0, i;
341 struct pcie_port *pp = (struct pcie_port *) msi_desc_to_pci_sysdata(desc);
342
343 pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
344 order_base_2(no_irqs));
345 if (pos0 < 0)
346 goto no_valid_irq;
347
348 irq = irq_find_mapping(pp->irq_domain, pos0);
349 if (!irq)
350 goto no_valid_irq;
351
352 /*
353 * irq_create_mapping (called from dw_pcie_host_init) pre-allocates
354 * descs so there is no need to allocate descs here. We can therefore
355 * assume that if irq_find_mapping above returns non-zero, then the
356 * descs are also successfully allocated.
357 */
358
359 for (i = 0; i < no_irqs; i++) {
360 if (irq_set_msi_desc_off(irq, i, desc) != 0) {
361 clear_irq_range(pp, irq, i, pos0);
362 goto no_valid_irq;
363 }
364 /*Enable corresponding interrupt in MSI interrupt controller */
365 if (pp->ops->msi_set_irq)
366 pp->ops->msi_set_irq(pp, pos0 + i);
367 else
368 dw_pcie_msi_set_irq(pp, pos0 + i);
369 }
370
371 *pos = pos0;
372 desc->nvec_used = no_irqs;
373 desc->msi_attrib.multiple = order_base_2(no_irqs);
374
375 return irq;
376
377no_valid_irq:
378 *pos = pos0;
379 return -ENOSPC;
380}
381
382static void dw_msi_setup_msg(struct pcie_port *pp, unsigned int irq, u32 pos)
383{
384 struct msi_msg msg;
385 u64 msi_target;
386
387 if (pp->ops->get_msi_addr)
388 msi_target = pp->ops->get_msi_addr(pp);
389 else
390 msi_target = virt_to_phys((void *)pp->msi_data);
391
392 msg.address_lo = (u32)(msi_target & 0xffffffff);
393 msg.address_hi = (u32)(msi_target >> 32 & 0xffffffff);
394
395 if (pp->ops->get_msi_data)
396 msg.data = pp->ops->get_msi_data(pp, pos);
397 else
398 msg.data = pos;
399
400 pci_write_msi_msg(irq, &msg);
401}
402
403static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
404 struct msi_desc *desc)
405{
406 int irq, pos;
407 struct pcie_port *pp = pdev->bus->sysdata;
408
409 if (desc->msi_attrib.is_msix)
410 return -EINVAL;
411
412 irq = assign_irq(1, desc, &pos);
413 if (irq < 0)
414 return irq;
415
416 dw_msi_setup_msg(pp, irq, pos);
417
418 return 0;
419}
420
421static int dw_msi_setup_irqs(struct msi_controller *chip, struct pci_dev *pdev,
422 int nvec, int type)
423{
424#ifdef CONFIG_PCI_MSI
425 int irq, pos;
426 struct msi_desc *desc;
427 struct pcie_port *pp = pdev->bus->sysdata;
428
429 /* MSI-X interrupts are not supported */
430 if (type == PCI_CAP_ID_MSIX)
431 return -EINVAL;
432
433 WARN_ON(!list_is_singular(&pdev->dev.msi_list));
434 desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
435
436 irq = assign_irq(nvec, desc, &pos);
437 if (irq < 0)
438 return irq;
439
440 dw_msi_setup_msg(pp, irq, pos);
441
442 return 0;
443#else
444 return -EINVAL;
445#endif
446}
447
448static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
449{
450 struct irq_data *data = irq_get_irq_data(irq);
451 struct msi_desc *msi = irq_data_get_msi_desc(data);
452 struct pcie_port *pp = (struct pcie_port *) msi_desc_to_pci_sysdata(msi);
453
454 clear_irq_range(pp, irq, 1, data->hwirq);
455}
456
457static struct msi_controller dw_pcie_msi_chip = {
458 .setup_irq = dw_msi_setup_irq,
459 .setup_irqs = dw_msi_setup_irqs,
460 .teardown_irq = dw_msi_teardown_irq,
461};
462
463int dw_pcie_wait_for_link(struct pcie_port *pp)
464{
465 int retries;
466
467 /* check if the link is up or not */
468 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
469 if (dw_pcie_link_up(pp)) {
470 dev_info(pp->dev, "link up\n");
471 return 0;
472 }
473 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
474 }
475
476 dev_err(pp->dev, "phy link never came up\n");
477
478 return -ETIMEDOUT;
479}
480
481int dw_pcie_link_up(struct pcie_port *pp)
482{
483 u32 val;
484
485 if (pp->ops->link_up)
486 return pp->ops->link_up(pp);
487
488 val = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1);
489 return ((val & PCIE_PHY_DEBUG_R1_LINK_UP) &&
490 (!(val & PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING)));
491}
492
493static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
494 irq_hw_number_t hwirq)
495{
496 irq_set_chip_and_handler(irq, &dw_msi_irq_chip, handle_simple_irq);
497 irq_set_chip_data(irq, domain->host_data);
498
499 return 0;
500}
501
502static const struct irq_domain_ops msi_domain_ops = {
503 .map = dw_pcie_msi_map,
504};
505
506static u8 dw_pcie_iatu_unroll_enabled(struct pcie_port *pp)
507{
508 u32 val;
509
510 val = dw_pcie_readl_rc(pp, PCIE_ATU_VIEWPORT);
511 if (val == 0xffffffff)
512 return 1;
513
514 return 0;
515}
516
517int dw_pcie_host_init(struct pcie_port *pp)
518{
519 struct device_node *np = pp->dev->of_node;
520 struct platform_device *pdev = to_platform_device(pp->dev);
521 struct pci_bus *bus, *child;
522 struct resource *cfg_res;
523 int i, ret;
524 LIST_HEAD(res);
525 struct resource_entry *win, *tmp;
526
527 cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
528 if (cfg_res) {
529 pp->cfg0_size = resource_size(cfg_res)/2;
530 pp->cfg1_size = resource_size(cfg_res)/2;
531 pp->cfg0_base = cfg_res->start;
532 pp->cfg1_base = cfg_res->start + pp->cfg0_size;
533 } else if (!pp->va_cfg0_base) {
534 dev_err(pp->dev, "missing *config* reg space\n");
535 }
536
537 ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &pp->io_base);
538 if (ret)
539 return ret;
540
541 ret = devm_request_pci_bus_resources(&pdev->dev, &res);
542 if (ret)
543 goto error;
544
545 /* Get the I/O and memory ranges from DT */
546 resource_list_for_each_entry_safe(win, tmp, &res) {
547 switch (resource_type(win->res)) {
548 case IORESOURCE_IO:
549 ret = pci_remap_iospace(win->res, pp->io_base);
550 if (ret) {
551 dev_warn(pp->dev, "error %d: failed to map resource %pR\n",
552 ret, win->res);
553 resource_list_destroy_entry(win);
554 } else {
555 pp->io = win->res;
556 pp->io->name = "I/O";
557 pp->io_size = resource_size(pp->io);
558 pp->io_bus_addr = pp->io->start - win->offset;
559 }
560 break;
561 case IORESOURCE_MEM:
562 pp->mem = win->res;
563 pp->mem->name = "MEM";
564 pp->mem_size = resource_size(pp->mem);
565 pp->mem_bus_addr = pp->mem->start - win->offset;
566 break;
567 case 0:
568 pp->cfg = win->res;
569 pp->cfg0_size = resource_size(pp->cfg)/2;
570 pp->cfg1_size = resource_size(pp->cfg)/2;
571 pp->cfg0_base = pp->cfg->start;
572 pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
573 break;
574 case IORESOURCE_BUS:
575 pp->busn = win->res;
576 break;
577 }
578 }
579
580 if (!pp->dbi_base) {
581 pp->dbi_base = devm_ioremap(pp->dev, pp->cfg->start,
582 resource_size(pp->cfg));
583 if (!pp->dbi_base) {
584 dev_err(pp->dev, "error with ioremap\n");
585 ret = -ENOMEM;
586 goto error;
587 }
588 }
589
590 pp->mem_base = pp->mem->start;
591
592 if (!pp->va_cfg0_base) {
593 pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
594 pp->cfg0_size);
595 if (!pp->va_cfg0_base) {
596 dev_err(pp->dev, "error with ioremap in function\n");
597 ret = -ENOMEM;
598 goto error;
599 }
600 }
601
602 if (!pp->va_cfg1_base) {
603 pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
604 pp->cfg1_size);
605 if (!pp->va_cfg1_base) {
606 dev_err(pp->dev, "error with ioremap\n");
607 ret = -ENOMEM;
608 goto error;
609 }
610 }
611
612 ret = of_property_read_u32(np, "num-lanes", &pp->lanes);
613 if (ret)
614 pp->lanes = 0;
615
616 ret = of_property_read_u32(np, "num-viewport", &pp->num_viewport);
617 if (ret)
618 pp->num_viewport = 2;
619
620 if (IS_ENABLED(CONFIG_PCI_MSI)) {
621 if (!pp->ops->msi_host_init) {
622 pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
623 MAX_MSI_IRQS, &msi_domain_ops,
624 &dw_pcie_msi_chip);
625 if (!pp->irq_domain) {
626 dev_err(pp->dev, "irq domain init failed\n");
627 ret = -ENXIO;
628 goto error;
629 }
630
631 for (i = 0; i < MAX_MSI_IRQS; i++)
632 irq_create_mapping(pp->irq_domain, i);
633 } else {
634 ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip);
635 if (ret < 0)
636 goto error;
637 }
638 }
639
640 if (pp->ops->host_init)
641 pp->ops->host_init(pp);
642
643 pp->root_bus_nr = pp->busn->start;
644 if (IS_ENABLED(CONFIG_PCI_MSI)) {
645 bus = pci_scan_root_bus_msi(pp->dev, pp->root_bus_nr,
646 &dw_pcie_ops, pp, &res,
647 &dw_pcie_msi_chip);
648 dw_pcie_msi_chip.dev = pp->dev;
649 } else
650 bus = pci_scan_root_bus(pp->dev, pp->root_bus_nr, &dw_pcie_ops,
651 pp, &res);
652 if (!bus) {
653 ret = -ENOMEM;
654 goto error;
655 }
656
657 if (pp->ops->scan_bus)
658 pp->ops->scan_bus(pp);
659
660#ifdef CONFIG_ARM
661 /* support old dtbs that incorrectly describe IRQs */
662 pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
663#endif
664
665 pci_bus_size_bridges(bus);
666 pci_bus_assign_resources(bus);
667
668 list_for_each_entry(child, &bus->children, node)
669 pcie_bus_configure_settings(child);
670
671 pci_bus_add_devices(bus);
672 return 0;
673
674error:
675 pci_free_resource_list(&res);
676 return ret;
677}
678
679static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
680 u32 devfn, int where, int size, u32 *val)
681{
682 int ret, type;
683 u32 busdev, cfg_size;
684 u64 cpu_addr;
685 void __iomem *va_cfg_base;
686
687 if (pp->ops->rd_other_conf)
688 return pp->ops->rd_other_conf(pp, bus, devfn, where, size, val);
689
690 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
691 PCIE_ATU_FUNC(PCI_FUNC(devfn));
692
693 if (bus->parent->number == pp->root_bus_nr) {
694 type = PCIE_ATU_TYPE_CFG0;
695 cpu_addr = pp->cfg0_base;
696 cfg_size = pp->cfg0_size;
697 va_cfg_base = pp->va_cfg0_base;
698 } else {
699 type = PCIE_ATU_TYPE_CFG1;
700 cpu_addr = pp->cfg1_base;
701 cfg_size = pp->cfg1_size;
702 va_cfg_base = pp->va_cfg1_base;
703 }
704
705 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
706 type, cpu_addr,
707 busdev, cfg_size);
708 ret = dw_pcie_cfg_read(va_cfg_base + where, size, val);
709 if (pp->num_viewport <= 2)
710 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
711 PCIE_ATU_TYPE_IO, pp->io_base,
712 pp->io_bus_addr, pp->io_size);
713
714 return ret;
715}
716
717static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
718 u32 devfn, int where, int size, u32 val)
719{
720 int ret, type;
721 u32 busdev, cfg_size;
722 u64 cpu_addr;
723 void __iomem *va_cfg_base;
724
725 if (pp->ops->wr_other_conf)
726 return pp->ops->wr_other_conf(pp, bus, devfn, where, size, val);
727
728 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
729 PCIE_ATU_FUNC(PCI_FUNC(devfn));
730
731 if (bus->parent->number == pp->root_bus_nr) {
732 type = PCIE_ATU_TYPE_CFG0;
733 cpu_addr = pp->cfg0_base;
734 cfg_size = pp->cfg0_size;
735 va_cfg_base = pp->va_cfg0_base;
736 } else {
737 type = PCIE_ATU_TYPE_CFG1;
738 cpu_addr = pp->cfg1_base;
739 cfg_size = pp->cfg1_size;
740 va_cfg_base = pp->va_cfg1_base;
741 }
742
743 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
744 type, cpu_addr,
745 busdev, cfg_size);
746 ret = dw_pcie_cfg_write(va_cfg_base + where, size, val);
747 if (pp->num_viewport <= 2)
748 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
749 PCIE_ATU_TYPE_IO, pp->io_base,
750 pp->io_bus_addr, pp->io_size);
751
752 return ret;
753}
754
755static int dw_pcie_valid_device(struct pcie_port *pp, struct pci_bus *bus,
756 int dev)
757{
758 /* If there is no link, then there is no device */
759 if (bus->number != pp->root_bus_nr) {
760 if (!dw_pcie_link_up(pp))
761 return 0;
762 }
763
764 /* access only one slot on each root port */
765 if (bus->number == pp->root_bus_nr && dev > 0)
766 return 0;
767
768 return 1;
769}
770
771static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
772 int size, u32 *val)
773{
774 struct pcie_port *pp = bus->sysdata;
775
776 if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn))) {
777 *val = 0xffffffff;
778 return PCIBIOS_DEVICE_NOT_FOUND;
779 }
780
781 if (bus->number == pp->root_bus_nr)
782 return dw_pcie_rd_own_conf(pp, where, size, val);
783
784 return dw_pcie_rd_other_conf(pp, bus, devfn, where, size, val);
785}
786
787static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
788 int where, int size, u32 val)
789{
790 struct pcie_port *pp = bus->sysdata;
791
792 if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn)))
793 return PCIBIOS_DEVICE_NOT_FOUND;
794
795 if (bus->number == pp->root_bus_nr)
796 return dw_pcie_wr_own_conf(pp, where, size, val);
797
798 return dw_pcie_wr_other_conf(pp, bus, devfn, where, size, val);
799}
800
801static struct pci_ops dw_pcie_ops = {
802 .read = dw_pcie_rd_conf,
803 .write = dw_pcie_wr_conf,
804};
805
806void dw_pcie_setup_rc(struct pcie_port *pp)
807{
808 u32 val;
809
810 /* set the number of lanes */
811 val = dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL);
812 val &= ~PORT_LINK_MODE_MASK;
813 switch (pp->lanes) {
814 case 1:
815 val |= PORT_LINK_MODE_1_LANES;
816 break;
817 case 2:
818 val |= PORT_LINK_MODE_2_LANES;
819 break;
820 case 4:
821 val |= PORT_LINK_MODE_4_LANES;
822 break;
823 case 8:
824 val |= PORT_LINK_MODE_8_LANES;
825 break;
826 default:
827 dev_err(pp->dev, "num-lanes %u: invalid value\n", pp->lanes);
828 return;
829 }
830 dw_pcie_writel_rc(pp, PCIE_PORT_LINK_CONTROL, val);
831
832 /* set link width speed control register */
833 val = dw_pcie_readl_rc(pp, PCIE_LINK_WIDTH_SPEED_CONTROL);
834 val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
835 switch (pp->lanes) {
836 case 1:
837 val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
838 break;
839 case 2:
840 val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
841 break;
842 case 4:
843 val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
844 break;
845 case 8:
846 val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
847 break;
848 }
849 dw_pcie_writel_rc(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
850
851 /* setup RC BARs */
852 dw_pcie_writel_rc(pp, PCI_BASE_ADDRESS_0, 0x00000004);
853 dw_pcie_writel_rc(pp, PCI_BASE_ADDRESS_1, 0x00000000);
854
855 /* setup interrupt pins */
856 val = dw_pcie_readl_rc(pp, PCI_INTERRUPT_LINE);
857 val &= 0xffff00ff;
858 val |= 0x00000100;
859 dw_pcie_writel_rc(pp, PCI_INTERRUPT_LINE, val);
860
861 /* setup bus numbers */
862 val = dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS);
863 val &= 0xff000000;
864 val |= 0x00010100;
865 dw_pcie_writel_rc(pp, PCI_PRIMARY_BUS, val);
866
867 /* setup command register */
868 val = dw_pcie_readl_rc(pp, PCI_COMMAND);
869 val &= 0xffff0000;
870 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
871 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
872 dw_pcie_writel_rc(pp, PCI_COMMAND, val);
873
874 /*
875 * If the platform provides ->rd_other_conf, it means the platform
876 * uses its own address translation component rather than ATU, so
877 * we should not program the ATU here.
878 */
879 if (!pp->ops->rd_other_conf) {
880 /* get iATU unroll support */
881 pp->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pp);
882 dev_dbg(pp->dev, "iATU unroll: %s\n",
883 pp->iatu_unroll_enabled ? "enabled" : "disabled");
884
885 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
886 PCIE_ATU_TYPE_MEM, pp->mem_base,
887 pp->mem_bus_addr, pp->mem_size);
888 if (pp->num_viewport > 2)
889 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX2,
890 PCIE_ATU_TYPE_IO, pp->io_base,
891 pp->io_bus_addr, pp->io_size);
892 }
893
894 dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
895
896 /* program correct class for RC */
897 dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
898
899 dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
900 val |= PORT_LOGIC_SPEED_CHANGE;
901 dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
902}