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/module.h>
18 #include <linux/msi.h>
19 #include <linux/of_address.h>
20 #include <linux/of_pci.h>
21 #include <linux/pci.h>
22 #include <linux/pci_regs.h>
23 #include <linux/platform_device.h>
24 #include <linux/types.h>
25
26 #include "pcie-designware.h"
27
28 /* Synopsis specific PCIE configuration registers */
29 #define PCIE_PORT_LINK_CONTROL 0x710
30 #define PORT_LINK_MODE_MASK (0x3f << 16)
31 #define PORT_LINK_MODE_1_LANES (0x1 << 16)
32 #define PORT_LINK_MODE_2_LANES (0x3 << 16)
33 #define PORT_LINK_MODE_4_LANES (0x7 << 16)
34 #define PORT_LINK_MODE_8_LANES (0xf << 16)
35
36 #define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
37 #define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
38 #define PORT_LOGIC_LINK_WIDTH_MASK (0x1f << 8)
39 #define PORT_LOGIC_LINK_WIDTH_1_LANES (0x1 << 8)
40 #define PORT_LOGIC_LINK_WIDTH_2_LANES (0x2 << 8)
41 #define PORT_LOGIC_LINK_WIDTH_4_LANES (0x4 << 8)
42 #define PORT_LOGIC_LINK_WIDTH_8_LANES (0x8 << 8)
43
44 #define PCIE_MSI_ADDR_LO 0x820
45 #define PCIE_MSI_ADDR_HI 0x824
46 #define PCIE_MSI_INTR0_ENABLE 0x828
47 #define PCIE_MSI_INTR0_MASK 0x82C
48 #define PCIE_MSI_INTR0_STATUS 0x830
49
50 #define PCIE_ATU_VIEWPORT 0x900
51 #define PCIE_ATU_REGION_INBOUND (0x1 << 31)
52 #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
53 #define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
54 #define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
55 #define PCIE_ATU_CR1 0x904
56 #define PCIE_ATU_TYPE_MEM (0x0 << 0)
57 #define PCIE_ATU_TYPE_IO (0x2 << 0)
58 #define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
59 #define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
60 #define PCIE_ATU_CR2 0x908
61 #define PCIE_ATU_ENABLE (0x1 << 31)
62 #define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
63 #define PCIE_ATU_LOWER_BASE 0x90C
64 #define PCIE_ATU_UPPER_BASE 0x910
65 #define PCIE_ATU_LIMIT 0x914
66 #define PCIE_ATU_LOWER_TARGET 0x918
67 #define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
68 #define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
69 #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
70 #define PCIE_ATU_UPPER_TARGET 0x91C
71
72 static struct pci_ops dw_pcie_ops;
73
dw_pcie_cfg_read(void __iomem * addr,int size,u32 * val)74 int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val)
75 {
76 if ((uintptr_t)addr & (size - 1)) {
77 *val = 0;
78 return PCIBIOS_BAD_REGISTER_NUMBER;
79 }
80
81 if (size == 4)
82 *val = readl(addr);
83 else if (size == 2)
84 *val = readw(addr);
85 else if (size == 1)
86 *val = readb(addr);
87 else {
88 *val = 0;
89 return PCIBIOS_BAD_REGISTER_NUMBER;
90 }
91
92 return PCIBIOS_SUCCESSFUL;
93 }
94
dw_pcie_cfg_write(void __iomem * addr,int size,u32 val)95 int dw_pcie_cfg_write(void __iomem *addr, int size, u32 val)
96 {
97 if ((uintptr_t)addr & (size - 1))
98 return PCIBIOS_BAD_REGISTER_NUMBER;
99
100 if (size == 4)
101 writel(val, addr);
102 else if (size == 2)
103 writew(val, addr);
104 else if (size == 1)
105 writeb(val, addr);
106 else
107 return PCIBIOS_BAD_REGISTER_NUMBER;
108
109 return PCIBIOS_SUCCESSFUL;
110 }
111
dw_pcie_readl_rc(struct pcie_port * pp,u32 reg,u32 * val)112 static inline void dw_pcie_readl_rc(struct pcie_port *pp, u32 reg, u32 *val)
113 {
114 if (pp->ops->readl_rc)
115 pp->ops->readl_rc(pp, pp->dbi_base + reg, val);
116 else
117 *val = readl(pp->dbi_base + reg);
118 }
119
dw_pcie_writel_rc(struct pcie_port * pp,u32 val,u32 reg)120 static inline void dw_pcie_writel_rc(struct pcie_port *pp, u32 val, u32 reg)
121 {
122 if (pp->ops->writel_rc)
123 pp->ops->writel_rc(pp, val, pp->dbi_base + reg);
124 else
125 writel(val, pp->dbi_base + reg);
126 }
127
dw_pcie_rd_own_conf(struct pcie_port * pp,int where,int size,u32 * val)128 static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
129 u32 *val)
130 {
131 int ret;
132
133 if (pp->ops->rd_own_conf)
134 ret = pp->ops->rd_own_conf(pp, where, size, val);
135 else
136 ret = dw_pcie_cfg_read(pp->dbi_base + where, size, val);
137
138 return ret;
139 }
140
dw_pcie_wr_own_conf(struct pcie_port * pp,int where,int size,u32 val)141 static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
142 u32 val)
143 {
144 int ret;
145
146 if (pp->ops->wr_own_conf)
147 ret = pp->ops->wr_own_conf(pp, where, size, val);
148 else
149 ret = dw_pcie_cfg_write(pp->dbi_base + where, size, val);
150
151 return ret;
152 }
153
dw_pcie_prog_outbound_atu(struct pcie_port * pp,int index,int type,u64 cpu_addr,u64 pci_addr,u32 size)154 static void dw_pcie_prog_outbound_atu(struct pcie_port *pp, int index,
155 int type, u64 cpu_addr, u64 pci_addr, u32 size)
156 {
157 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | index,
158 PCIE_ATU_VIEWPORT);
159 dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr), PCIE_ATU_LOWER_BASE);
160 dw_pcie_writel_rc(pp, upper_32_bits(cpu_addr), PCIE_ATU_UPPER_BASE);
161 dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr + size - 1),
162 PCIE_ATU_LIMIT);
163 dw_pcie_writel_rc(pp, lower_32_bits(pci_addr), PCIE_ATU_LOWER_TARGET);
164 dw_pcie_writel_rc(pp, upper_32_bits(pci_addr), PCIE_ATU_UPPER_TARGET);
165 dw_pcie_writel_rc(pp, type, PCIE_ATU_CR1);
166 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
167 }
168
169 static struct irq_chip dw_msi_irq_chip = {
170 .name = "PCI-MSI",
171 .irq_enable = pci_msi_unmask_irq,
172 .irq_disable = pci_msi_mask_irq,
173 .irq_mask = pci_msi_mask_irq,
174 .irq_unmask = pci_msi_unmask_irq,
175 };
176
177 /* MSI int handler */
dw_handle_msi_irq(struct pcie_port * pp)178 irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
179 {
180 unsigned long val;
181 int i, pos, irq;
182 irqreturn_t ret = IRQ_NONE;
183
184 for (i = 0; i < MAX_MSI_CTRLS; i++) {
185 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
186 (u32 *)&val);
187 if (val) {
188 ret = IRQ_HANDLED;
189 pos = 0;
190 while ((pos = find_next_bit(&val, 32, pos)) != 32) {
191 irq = irq_find_mapping(pp->irq_domain,
192 i * 32 + pos);
193 dw_pcie_wr_own_conf(pp,
194 PCIE_MSI_INTR0_STATUS + i * 12,
195 4, 1 << pos);
196 generic_handle_irq(irq);
197 pos++;
198 }
199 }
200 }
201
202 return ret;
203 }
204
dw_pcie_msi_init(struct pcie_port * pp)205 void dw_pcie_msi_init(struct pcie_port *pp)
206 {
207 u64 msi_target;
208
209 pp->msi_data = __get_free_pages(GFP_KERNEL, 0);
210 msi_target = virt_to_phys((void *)pp->msi_data);
211
212 /* program the msi_data */
213 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
214 (u32)(msi_target & 0xffffffff));
215 dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
216 (u32)(msi_target >> 32 & 0xffffffff));
217 }
218
dw_pcie_msi_clear_irq(struct pcie_port * pp,int irq)219 static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
220 {
221 unsigned int res, bit, val;
222
223 res = (irq / 32) * 12;
224 bit = irq % 32;
225 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
226 val &= ~(1 << bit);
227 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
228 }
229
clear_irq_range(struct pcie_port * pp,unsigned int irq_base,unsigned int nvec,unsigned int pos)230 static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
231 unsigned int nvec, unsigned int pos)
232 {
233 unsigned int i;
234
235 for (i = 0; i < nvec; i++) {
236 irq_set_msi_desc_off(irq_base, i, NULL);
237 /* Disable corresponding interrupt on MSI controller */
238 if (pp->ops->msi_clear_irq)
239 pp->ops->msi_clear_irq(pp, pos + i);
240 else
241 dw_pcie_msi_clear_irq(pp, pos + i);
242 }
243
244 bitmap_release_region(pp->msi_irq_in_use, pos, order_base_2(nvec));
245 }
246
dw_pcie_msi_set_irq(struct pcie_port * pp,int irq)247 static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
248 {
249 unsigned int res, bit, val;
250
251 res = (irq / 32) * 12;
252 bit = irq % 32;
253 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
254 val |= 1 << bit;
255 dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
256 }
257
assign_irq(int no_irqs,struct msi_desc * desc,int * pos)258 static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
259 {
260 int irq, pos0, i;
261 struct pcie_port *pp = (struct pcie_port *) msi_desc_to_pci_sysdata(desc);
262
263 pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
264 order_base_2(no_irqs));
265 if (pos0 < 0)
266 goto no_valid_irq;
267
268 irq = irq_find_mapping(pp->irq_domain, pos0);
269 if (!irq)
270 goto no_valid_irq;
271
272 /*
273 * irq_create_mapping (called from dw_pcie_host_init) pre-allocates
274 * descs so there is no need to allocate descs here. We can therefore
275 * assume that if irq_find_mapping above returns non-zero, then the
276 * descs are also successfully allocated.
277 */
278
279 for (i = 0; i < no_irqs; i++) {
280 if (irq_set_msi_desc_off(irq, i, desc) != 0) {
281 clear_irq_range(pp, irq, i, pos0);
282 goto no_valid_irq;
283 }
284 /*Enable corresponding interrupt in MSI interrupt controller */
285 if (pp->ops->msi_set_irq)
286 pp->ops->msi_set_irq(pp, pos0 + i);
287 else
288 dw_pcie_msi_set_irq(pp, pos0 + i);
289 }
290
291 *pos = pos0;
292 desc->nvec_used = no_irqs;
293 desc->msi_attrib.multiple = order_base_2(no_irqs);
294
295 return irq;
296
297 no_valid_irq:
298 *pos = pos0;
299 return -ENOSPC;
300 }
301
dw_msi_setup_msg(struct pcie_port * pp,unsigned int irq,u32 pos)302 static void dw_msi_setup_msg(struct pcie_port *pp, unsigned int irq, u32 pos)
303 {
304 struct msi_msg msg;
305 u64 msi_target;
306
307 if (pp->ops->get_msi_addr)
308 msi_target = pp->ops->get_msi_addr(pp);
309 else
310 msi_target = virt_to_phys((void *)pp->msi_data);
311
312 msg.address_lo = (u32)(msi_target & 0xffffffff);
313 msg.address_hi = (u32)(msi_target >> 32 & 0xffffffff);
314
315 if (pp->ops->get_msi_data)
316 msg.data = pp->ops->get_msi_data(pp, pos);
317 else
318 msg.data = pos;
319
320 pci_write_msi_msg(irq, &msg);
321 }
322
dw_msi_setup_irq(struct msi_controller * chip,struct pci_dev * pdev,struct msi_desc * desc)323 static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
324 struct msi_desc *desc)
325 {
326 int irq, pos;
327 struct pcie_port *pp = pdev->bus->sysdata;
328
329 if (desc->msi_attrib.is_msix)
330 return -EINVAL;
331
332 irq = assign_irq(1, desc, &pos);
333 if (irq < 0)
334 return irq;
335
336 dw_msi_setup_msg(pp, irq, pos);
337
338 return 0;
339 }
340
dw_msi_setup_irqs(struct msi_controller * chip,struct pci_dev * pdev,int nvec,int type)341 static int dw_msi_setup_irqs(struct msi_controller *chip, struct pci_dev *pdev,
342 int nvec, int type)
343 {
344 #ifdef CONFIG_PCI_MSI
345 int irq, pos;
346 struct msi_desc *desc;
347 struct pcie_port *pp = pdev->bus->sysdata;
348
349 /* MSI-X interrupts are not supported */
350 if (type == PCI_CAP_ID_MSIX)
351 return -EINVAL;
352
353 WARN_ON(!list_is_singular(&pdev->dev.msi_list));
354 desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
355
356 irq = assign_irq(nvec, desc, &pos);
357 if (irq < 0)
358 return irq;
359
360 dw_msi_setup_msg(pp, irq, pos);
361
362 return 0;
363 #else
364 return -EINVAL;
365 #endif
366 }
367
dw_msi_teardown_irq(struct msi_controller * chip,unsigned int irq)368 static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
369 {
370 struct irq_data *data = irq_get_irq_data(irq);
371 struct msi_desc *msi = irq_data_get_msi_desc(data);
372 struct pcie_port *pp = (struct pcie_port *) msi_desc_to_pci_sysdata(msi);
373
374 clear_irq_range(pp, irq, 1, data->hwirq);
375 }
376
377 static struct msi_controller dw_pcie_msi_chip = {
378 .setup_irq = dw_msi_setup_irq,
379 .setup_irqs = dw_msi_setup_irqs,
380 .teardown_irq = dw_msi_teardown_irq,
381 };
382
dw_pcie_link_up(struct pcie_port * pp)383 int dw_pcie_link_up(struct pcie_port *pp)
384 {
385 if (pp->ops->link_up)
386 return pp->ops->link_up(pp);
387 else
388 return 0;
389 }
390
dw_pcie_msi_map(struct irq_domain * domain,unsigned int irq,irq_hw_number_t hwirq)391 static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
392 irq_hw_number_t hwirq)
393 {
394 irq_set_chip_and_handler(irq, &dw_msi_irq_chip, handle_simple_irq);
395 irq_set_chip_data(irq, domain->host_data);
396
397 return 0;
398 }
399
400 static const struct irq_domain_ops msi_domain_ops = {
401 .map = dw_pcie_msi_map,
402 };
403
dw_pcie_host_init(struct pcie_port * pp)404 int dw_pcie_host_init(struct pcie_port *pp)
405 {
406 struct device_node *np = pp->dev->of_node;
407 struct platform_device *pdev = to_platform_device(pp->dev);
408 struct pci_bus *bus, *child;
409 struct resource *cfg_res;
410 u32 val;
411 int i, ret;
412 LIST_HEAD(res);
413 struct resource_entry *win;
414
415 cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
416 if (cfg_res) {
417 pp->cfg0_size = resource_size(cfg_res)/2;
418 pp->cfg1_size = resource_size(cfg_res)/2;
419 pp->cfg0_base = cfg_res->start;
420 pp->cfg1_base = cfg_res->start + pp->cfg0_size;
421 } else if (!pp->va_cfg0_base) {
422 dev_err(pp->dev, "missing *config* reg space\n");
423 }
424
425 ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &pp->io_base);
426 if (ret)
427 return ret;
428
429 /* Get the I/O and memory ranges from DT */
430 resource_list_for_each_entry(win, &res) {
431 switch (resource_type(win->res)) {
432 case IORESOURCE_IO:
433 pp->io = win->res;
434 pp->io->name = "I/O";
435 pp->io_size = resource_size(pp->io);
436 pp->io_bus_addr = pp->io->start - win->offset;
437 ret = pci_remap_iospace(pp->io, pp->io_base);
438 if (ret) {
439 dev_warn(pp->dev, "error %d: failed to map resource %pR\n",
440 ret, pp->io);
441 continue;
442 }
443 break;
444 case IORESOURCE_MEM:
445 pp->mem = win->res;
446 pp->mem->name = "MEM";
447 pp->mem_size = resource_size(pp->mem);
448 pp->mem_bus_addr = pp->mem->start - win->offset;
449 break;
450 case 0:
451 pp->cfg = win->res;
452 pp->cfg0_size = resource_size(pp->cfg)/2;
453 pp->cfg1_size = resource_size(pp->cfg)/2;
454 pp->cfg0_base = pp->cfg->start;
455 pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
456 break;
457 case IORESOURCE_BUS:
458 pp->busn = win->res;
459 break;
460 default:
461 continue;
462 }
463 }
464
465 if (!pp->dbi_base) {
466 pp->dbi_base = devm_ioremap(pp->dev, pp->cfg->start,
467 resource_size(pp->cfg));
468 if (!pp->dbi_base) {
469 dev_err(pp->dev, "error with ioremap\n");
470 return -ENOMEM;
471 }
472 }
473
474 pp->mem_base = pp->mem->start;
475
476 if (!pp->va_cfg0_base) {
477 pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
478 pp->cfg0_size);
479 if (!pp->va_cfg0_base) {
480 dev_err(pp->dev, "error with ioremap in function\n");
481 return -ENOMEM;
482 }
483 }
484
485 if (!pp->va_cfg1_base) {
486 pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
487 pp->cfg1_size);
488 if (!pp->va_cfg1_base) {
489 dev_err(pp->dev, "error with ioremap\n");
490 return -ENOMEM;
491 }
492 }
493
494 ret = of_property_read_u32(np, "num-lanes", &pp->lanes);
495 if (ret)
496 pp->lanes = 0;
497
498 if (IS_ENABLED(CONFIG_PCI_MSI)) {
499 if (!pp->ops->msi_host_init) {
500 pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
501 MAX_MSI_IRQS, &msi_domain_ops,
502 &dw_pcie_msi_chip);
503 if (!pp->irq_domain) {
504 dev_err(pp->dev, "irq domain init failed\n");
505 return -ENXIO;
506 }
507
508 for (i = 0; i < MAX_MSI_IRQS; i++)
509 irq_create_mapping(pp->irq_domain, i);
510 } else {
511 ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip);
512 if (ret < 0)
513 return ret;
514 }
515 }
516
517 if (pp->ops->host_init)
518 pp->ops->host_init(pp);
519
520 if (!pp->ops->rd_other_conf)
521 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
522 PCIE_ATU_TYPE_MEM, pp->mem_base,
523 pp->mem_bus_addr, pp->mem_size);
524
525 dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
526
527 /* program correct class for RC */
528 dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
529
530 dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
531 val |= PORT_LOGIC_SPEED_CHANGE;
532 dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
533
534 pp->root_bus_nr = pp->busn->start;
535 if (IS_ENABLED(CONFIG_PCI_MSI)) {
536 bus = pci_scan_root_bus_msi(pp->dev, pp->root_bus_nr,
537 &dw_pcie_ops, pp, &res,
538 &dw_pcie_msi_chip);
539 dw_pcie_msi_chip.dev = pp->dev;
540 } else
541 bus = pci_scan_root_bus(pp->dev, pp->root_bus_nr, &dw_pcie_ops,
542 pp, &res);
543 if (!bus)
544 return -ENOMEM;
545
546 if (pp->ops->scan_bus)
547 pp->ops->scan_bus(pp);
548
549 #ifdef CONFIG_ARM
550 /* support old dtbs that incorrectly describe IRQs */
551 pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
552 #endif
553
554 if (!pci_has_flag(PCI_PROBE_ONLY)) {
555 pci_bus_size_bridges(bus);
556 pci_bus_assign_resources(bus);
557
558 list_for_each_entry(child, &bus->children, node)
559 pcie_bus_configure_settings(child);
560 }
561
562 pci_bus_add_devices(bus);
563 return 0;
564 }
565
dw_pcie_rd_other_conf(struct pcie_port * pp,struct pci_bus * bus,u32 devfn,int where,int size,u32 * val)566 static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
567 u32 devfn, int where, int size, u32 *val)
568 {
569 int ret, type;
570 u32 busdev, cfg_size;
571 u64 cpu_addr;
572 void __iomem *va_cfg_base;
573
574 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
575 PCIE_ATU_FUNC(PCI_FUNC(devfn));
576
577 if (bus->parent->number == pp->root_bus_nr) {
578 type = PCIE_ATU_TYPE_CFG0;
579 cpu_addr = pp->cfg0_base;
580 cfg_size = pp->cfg0_size;
581 va_cfg_base = pp->va_cfg0_base;
582 } else {
583 type = PCIE_ATU_TYPE_CFG1;
584 cpu_addr = pp->cfg1_base;
585 cfg_size = pp->cfg1_size;
586 va_cfg_base = pp->va_cfg1_base;
587 }
588
589 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
590 type, cpu_addr,
591 busdev, cfg_size);
592 ret = dw_pcie_cfg_read(va_cfg_base + where, size, val);
593 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
594 PCIE_ATU_TYPE_IO, pp->io_base,
595 pp->io_bus_addr, pp->io_size);
596
597 return ret;
598 }
599
dw_pcie_wr_other_conf(struct pcie_port * pp,struct pci_bus * bus,u32 devfn,int where,int size,u32 val)600 static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
601 u32 devfn, int where, int size, u32 val)
602 {
603 int ret, type;
604 u32 busdev, cfg_size;
605 u64 cpu_addr;
606 void __iomem *va_cfg_base;
607
608 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
609 PCIE_ATU_FUNC(PCI_FUNC(devfn));
610
611 if (bus->parent->number == pp->root_bus_nr) {
612 type = PCIE_ATU_TYPE_CFG0;
613 cpu_addr = pp->cfg0_base;
614 cfg_size = pp->cfg0_size;
615 va_cfg_base = pp->va_cfg0_base;
616 } else {
617 type = PCIE_ATU_TYPE_CFG1;
618 cpu_addr = pp->cfg1_base;
619 cfg_size = pp->cfg1_size;
620 va_cfg_base = pp->va_cfg1_base;
621 }
622
623 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
624 type, cpu_addr,
625 busdev, cfg_size);
626 ret = dw_pcie_cfg_write(va_cfg_base + where, size, val);
627 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
628 PCIE_ATU_TYPE_IO, pp->io_base,
629 pp->io_bus_addr, pp->io_size);
630
631 return ret;
632 }
633
dw_pcie_valid_config(struct pcie_port * pp,struct pci_bus * bus,int dev)634 static int dw_pcie_valid_config(struct pcie_port *pp,
635 struct pci_bus *bus, int dev)
636 {
637 /* If there is no link, then there is no device */
638 if (bus->number != pp->root_bus_nr) {
639 if (!dw_pcie_link_up(pp))
640 return 0;
641 }
642
643 /* access only one slot on each root port */
644 if (bus->number == pp->root_bus_nr && dev > 0)
645 return 0;
646
647 /*
648 * do not read more than one device on the bus directly attached
649 * to RC's (Virtual Bridge's) DS side.
650 */
651 if (bus->primary == pp->root_bus_nr && dev > 0)
652 return 0;
653
654 return 1;
655 }
656
dw_pcie_rd_conf(struct pci_bus * bus,u32 devfn,int where,int size,u32 * val)657 static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
658 int size, u32 *val)
659 {
660 struct pcie_port *pp = bus->sysdata;
661 int ret;
662
663 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
664 *val = 0xffffffff;
665 return PCIBIOS_DEVICE_NOT_FOUND;
666 }
667
668 if (bus->number != pp->root_bus_nr)
669 if (pp->ops->rd_other_conf)
670 ret = pp->ops->rd_other_conf(pp, bus, devfn,
671 where, size, val);
672 else
673 ret = dw_pcie_rd_other_conf(pp, bus, devfn,
674 where, size, val);
675 else
676 ret = dw_pcie_rd_own_conf(pp, where, size, val);
677
678 return ret;
679 }
680
dw_pcie_wr_conf(struct pci_bus * bus,u32 devfn,int where,int size,u32 val)681 static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
682 int where, int size, u32 val)
683 {
684 struct pcie_port *pp = bus->sysdata;
685 int ret;
686
687 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
688 return PCIBIOS_DEVICE_NOT_FOUND;
689
690 if (bus->number != pp->root_bus_nr)
691 if (pp->ops->wr_other_conf)
692 ret = pp->ops->wr_other_conf(pp, bus, devfn,
693 where, size, val);
694 else
695 ret = dw_pcie_wr_other_conf(pp, bus, devfn,
696 where, size, val);
697 else
698 ret = dw_pcie_wr_own_conf(pp, where, size, val);
699
700 return ret;
701 }
702
703 static struct pci_ops dw_pcie_ops = {
704 .read = dw_pcie_rd_conf,
705 .write = dw_pcie_wr_conf,
706 };
707
dw_pcie_setup_rc(struct pcie_port * pp)708 void dw_pcie_setup_rc(struct pcie_port *pp)
709 {
710 u32 val;
711 u32 membase;
712 u32 memlimit;
713
714 /* set the number of lanes */
715 dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL, &val);
716 val &= ~PORT_LINK_MODE_MASK;
717 switch (pp->lanes) {
718 case 1:
719 val |= PORT_LINK_MODE_1_LANES;
720 break;
721 case 2:
722 val |= PORT_LINK_MODE_2_LANES;
723 break;
724 case 4:
725 val |= PORT_LINK_MODE_4_LANES;
726 break;
727 case 8:
728 val |= PORT_LINK_MODE_8_LANES;
729 break;
730 default:
731 dev_err(pp->dev, "num-lanes %u: invalid value\n", pp->lanes);
732 return;
733 }
734 dw_pcie_writel_rc(pp, val, PCIE_PORT_LINK_CONTROL);
735
736 /* set link width speed control register */
737 dw_pcie_readl_rc(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
738 val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
739 switch (pp->lanes) {
740 case 1:
741 val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
742 break;
743 case 2:
744 val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
745 break;
746 case 4:
747 val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
748 break;
749 case 8:
750 val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
751 break;
752 }
753 dw_pcie_writel_rc(pp, val, PCIE_LINK_WIDTH_SPEED_CONTROL);
754
755 /* setup RC BARs */
756 dw_pcie_writel_rc(pp, 0x00000004, PCI_BASE_ADDRESS_0);
757 dw_pcie_writel_rc(pp, 0x00000000, PCI_BASE_ADDRESS_1);
758
759 /* setup interrupt pins */
760 dw_pcie_readl_rc(pp, PCI_INTERRUPT_LINE, &val);
761 val &= 0xffff00ff;
762 val |= 0x00000100;
763 dw_pcie_writel_rc(pp, val, PCI_INTERRUPT_LINE);
764
765 /* setup bus numbers */
766 dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS, &val);
767 val &= 0xff000000;
768 val |= 0x00010100;
769 dw_pcie_writel_rc(pp, val, PCI_PRIMARY_BUS);
770
771 /* setup memory base, memory limit */
772 membase = ((u32)pp->mem_base & 0xfff00000) >> 16;
773 memlimit = (pp->mem_size + (u32)pp->mem_base) & 0xfff00000;
774 val = memlimit | membase;
775 dw_pcie_writel_rc(pp, val, PCI_MEMORY_BASE);
776
777 /* setup command register */
778 dw_pcie_readl_rc(pp, PCI_COMMAND, &val);
779 val &= 0xffff0000;
780 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
781 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
782 dw_pcie_writel_rc(pp, val, PCI_COMMAND);
783 }
784
785 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
786 MODULE_DESCRIPTION("Designware PCIe host controller driver");
787 MODULE_LICENSE("GPL v2");
788