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/kernel.h>
15#include <linux/module.h>
16#include <linux/of_address.h>
17#include <linux/pci.h>
18#include <linux/pci_regs.h>
19#include <linux/types.h>
20
21#include "pcie-designware.h"
22
23/* Synopsis specific PCIE configuration registers */
24#define PCIE_PORT_LINK_CONTROL 0x710
25#define PORT_LINK_MODE_MASK (0x3f << 16)
26#define PORT_LINK_MODE_1_LANES (0x1 << 16)
27#define PORT_LINK_MODE_2_LANES (0x3 << 16)
28#define PORT_LINK_MODE_4_LANES (0x7 << 16)
29
30#define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
31#define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
32#define PORT_LOGIC_LINK_WIDTH_MASK (0x1ff << 8)
33#define PORT_LOGIC_LINK_WIDTH_1_LANES (0x1 << 8)
34#define PORT_LOGIC_LINK_WIDTH_2_LANES (0x2 << 8)
35#define PORT_LOGIC_LINK_WIDTH_4_LANES (0x4 << 8)
36
37#define PCIE_MSI_ADDR_LO 0x820
38#define PCIE_MSI_ADDR_HI 0x824
39#define PCIE_MSI_INTR0_ENABLE 0x828
40#define PCIE_MSI_INTR0_MASK 0x82C
41#define PCIE_MSI_INTR0_STATUS 0x830
42
43#define PCIE_ATU_VIEWPORT 0x900
44#define PCIE_ATU_REGION_INBOUND (0x1 << 31)
45#define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
46#define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
47#define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
48#define PCIE_ATU_CR1 0x904
49#define PCIE_ATU_TYPE_MEM (0x0 << 0)
50#define PCIE_ATU_TYPE_IO (0x2 << 0)
51#define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
52#define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
53#define PCIE_ATU_CR2 0x908
54#define PCIE_ATU_ENABLE (0x1 << 31)
55#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
56#define PCIE_ATU_LOWER_BASE 0x90C
57#define PCIE_ATU_UPPER_BASE 0x910
58#define PCIE_ATU_LIMIT 0x914
59#define PCIE_ATU_LOWER_TARGET 0x918
60#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
61#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
62#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
63#define PCIE_ATU_UPPER_TARGET 0x91C
64
65static struct hw_pci dw_pci;
66
67unsigned long global_io_offset;
68
69static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
70{
71 return sys->private_data;
72}
73
74int cfg_read(void __iomem *addr, int where, int size, u32 *val)
75{
76 *val = readl(addr);
77
78 if (size == 1)
79 *val = (*val >> (8 * (where & 3))) & 0xff;
80 else if (size == 2)
81 *val = (*val >> (8 * (where & 3))) & 0xffff;
82 else if (size != 4)
83 return PCIBIOS_BAD_REGISTER_NUMBER;
84
85 return PCIBIOS_SUCCESSFUL;
86}
87
88int cfg_write(void __iomem *addr, int where, int size, u32 val)
89{
90 if (size == 4)
91 writel(val, addr);
92 else if (size == 2)
93 writew(val, addr + (where & 2));
94 else if (size == 1)
95 writeb(val, addr + (where & 3));
96 else
97 return PCIBIOS_BAD_REGISTER_NUMBER;
98
99 return PCIBIOS_SUCCESSFUL;
100}
101
102static inline void dw_pcie_readl_rc(struct pcie_port *pp, u32 reg, u32 *val)
103{
104 if (pp->ops->readl_rc)
105 pp->ops->readl_rc(pp, pp->dbi_base + reg, val);
106 else
107 *val = readl(pp->dbi_base + reg);
108}
109
110static inline void dw_pcie_writel_rc(struct pcie_port *pp, u32 val, u32 reg)
111{
112 if (pp->ops->writel_rc)
113 pp->ops->writel_rc(pp, val, pp->dbi_base + reg);
114 else
115 writel(val, pp->dbi_base + reg);
116}
117
118int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
119 u32 *val)
120{
121 int ret;
122
123 if (pp->ops->rd_own_conf)
124 ret = pp->ops->rd_own_conf(pp, where, size, val);
125 else
126 ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
127
128 return ret;
129}
130
131int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
132 u32 val)
133{
134 int ret;
135
136 if (pp->ops->wr_own_conf)
137 ret = pp->ops->wr_own_conf(pp, where, size, val);
138 else
139 ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size,
140 val);
141
142 return ret;
143}
144
145int dw_pcie_link_up(struct pcie_port *pp)
146{
147 if (pp->ops->link_up)
148 return pp->ops->link_up(pp);
149 else
150 return 0;
151}
152
153int __init dw_pcie_host_init(struct pcie_port *pp)
154{
155 struct device_node *np = pp->dev->of_node;
156 struct of_pci_range range;
157 struct of_pci_range_parser parser;
158 u32 val;
159
160 if (of_pci_range_parser_init(&parser, np)) {
161 dev_err(pp->dev, "missing ranges property\n");
162 return -EINVAL;
163 }
164
165 /* Get the I/O and memory ranges from DT */
166 for_each_of_pci_range(&parser, &range) {
167 unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
168 if (restype == IORESOURCE_IO) {
169 of_pci_range_to_resource(&range, np, &pp->io);
170 pp->io.name = "I/O";
171 pp->io.start = max_t(resource_size_t,
172 PCIBIOS_MIN_IO,
173 range.pci_addr + global_io_offset);
174 pp->io.end = min_t(resource_size_t,
175 IO_SPACE_LIMIT,
176 range.pci_addr + range.size
177 + global_io_offset);
178 pp->config.io_size = resource_size(&pp->io);
179 pp->config.io_bus_addr = range.pci_addr;
180 }
181 if (restype == IORESOURCE_MEM) {
182 of_pci_range_to_resource(&range, np, &pp->mem);
183 pp->mem.name = "MEM";
184 pp->config.mem_size = resource_size(&pp->mem);
185 pp->config.mem_bus_addr = range.pci_addr;
186 }
187 if (restype == 0) {
188 of_pci_range_to_resource(&range, np, &pp->cfg);
189 pp->config.cfg0_size = resource_size(&pp->cfg)/2;
190 pp->config.cfg1_size = resource_size(&pp->cfg)/2;
191 }
192 }
193
194 if (!pp->dbi_base) {
195 pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
196 resource_size(&pp->cfg));
197 if (!pp->dbi_base) {
198 dev_err(pp->dev, "error with ioremap\n");
199 return -ENOMEM;
200 }
201 }
202
203 pp->cfg0_base = pp->cfg.start;
204 pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
205 pp->io_base = pp->io.start;
206 pp->mem_base = pp->mem.start;
207
208 pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
209 pp->config.cfg0_size);
210 if (!pp->va_cfg0_base) {
211 dev_err(pp->dev, "error with ioremap in function\n");
212 return -ENOMEM;
213 }
214 pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
215 pp->config.cfg1_size);
216 if (!pp->va_cfg1_base) {
217 dev_err(pp->dev, "error with ioremap\n");
218 return -ENOMEM;
219 }
220
221 if (of_property_read_u32(np, "num-lanes", &pp->lanes)) {
222 dev_err(pp->dev, "Failed to parse the number of lanes\n");
223 return -EINVAL;
224 }
225
226 if (pp->ops->host_init)
227 pp->ops->host_init(pp);
228
229 dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
230
231 /* program correct class for RC */
232 dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
233
234 dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
235 val |= PORT_LOGIC_SPEED_CHANGE;
236 dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
237
238 dw_pci.nr_controllers = 1;
239 dw_pci.private_data = (void **)&pp;
240
241 pci_common_init(&dw_pci);
242 pci_assign_unassigned_resources();
243#ifdef CONFIG_PCI_DOMAINS
244 dw_pci.domain++;
245#endif
246
247 return 0;
248}
249
250static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
251{
252 /* Program viewport 0 : OUTBOUND : CFG0 */
253 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
254 PCIE_ATU_VIEWPORT);
255 dw_pcie_writel_rc(pp, pp->cfg0_base, PCIE_ATU_LOWER_BASE);
256 dw_pcie_writel_rc(pp, (pp->cfg0_base >> 32), PCIE_ATU_UPPER_BASE);
257 dw_pcie_writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1,
258 PCIE_ATU_LIMIT);
259 dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET);
260 dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET);
261 dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG0, PCIE_ATU_CR1);
262 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
263}
264
265static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
266{
267 /* Program viewport 1 : OUTBOUND : CFG1 */
268 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
269 PCIE_ATU_VIEWPORT);
270 dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1);
271 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
272 dw_pcie_writel_rc(pp, pp->cfg1_base, PCIE_ATU_LOWER_BASE);
273 dw_pcie_writel_rc(pp, (pp->cfg1_base >> 32), PCIE_ATU_UPPER_BASE);
274 dw_pcie_writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1,
275 PCIE_ATU_LIMIT);
276 dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET);
277 dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET);
278}
279
280static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
281{
282 /* Program viewport 0 : OUTBOUND : MEM */
283 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
284 PCIE_ATU_VIEWPORT);
285 dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, PCIE_ATU_CR1);
286 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
287 dw_pcie_writel_rc(pp, pp->mem_base, PCIE_ATU_LOWER_BASE);
288 dw_pcie_writel_rc(pp, (pp->mem_base >> 32), PCIE_ATU_UPPER_BASE);
289 dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
290 PCIE_ATU_LIMIT);
291 dw_pcie_writel_rc(pp, pp->config.mem_bus_addr, PCIE_ATU_LOWER_TARGET);
292 dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
293 PCIE_ATU_UPPER_TARGET);
294}
295
296static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
297{
298 /* Program viewport 1 : OUTBOUND : IO */
299 dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
300 PCIE_ATU_VIEWPORT);
301 dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, PCIE_ATU_CR1);
302 dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
303 dw_pcie_writel_rc(pp, pp->io_base, PCIE_ATU_LOWER_BASE);
304 dw_pcie_writel_rc(pp, (pp->io_base >> 32), PCIE_ATU_UPPER_BASE);
305 dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1,
306 PCIE_ATU_LIMIT);
307 dw_pcie_writel_rc(pp, pp->config.io_bus_addr, PCIE_ATU_LOWER_TARGET);
308 dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
309 PCIE_ATU_UPPER_TARGET);
310}
311
312static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
313 u32 devfn, int where, int size, u32 *val)
314{
315 int ret = PCIBIOS_SUCCESSFUL;
316 u32 address, busdev;
317
318 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
319 PCIE_ATU_FUNC(PCI_FUNC(devfn));
320 address = where & ~0x3;
321
322 if (bus->parent->number == pp->root_bus_nr) {
323 dw_pcie_prog_viewport_cfg0(pp, busdev);
324 ret = cfg_read(pp->va_cfg0_base + address, where, size, val);
325 dw_pcie_prog_viewport_mem_outbound(pp);
326 } else {
327 dw_pcie_prog_viewport_cfg1(pp, busdev);
328 ret = cfg_read(pp->va_cfg1_base + address, where, size, val);
329 dw_pcie_prog_viewport_io_outbound(pp);
330 }
331
332 return ret;
333}
334
335static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
336 u32 devfn, int where, int size, u32 val)
337{
338 int ret = PCIBIOS_SUCCESSFUL;
339 u32 address, busdev;
340
341 busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
342 PCIE_ATU_FUNC(PCI_FUNC(devfn));
343 address = where & ~0x3;
344
345 if (bus->parent->number == pp->root_bus_nr) {
346 dw_pcie_prog_viewport_cfg0(pp, busdev);
347 ret = cfg_write(pp->va_cfg0_base + address, where, size, val);
348 dw_pcie_prog_viewport_mem_outbound(pp);
349 } else {
350 dw_pcie_prog_viewport_cfg1(pp, busdev);
351 ret = cfg_write(pp->va_cfg1_base + address, where, size, val);
352 dw_pcie_prog_viewport_io_outbound(pp);
353 }
354
355 return ret;
356}
357
358
359static int dw_pcie_valid_config(struct pcie_port *pp,
360 struct pci_bus *bus, int dev)
361{
362 /* If there is no link, then there is no device */
363 if (bus->number != pp->root_bus_nr) {
364 if (!dw_pcie_link_up(pp))
365 return 0;
366 }
367
368 /* access only one slot on each root port */
369 if (bus->number == pp->root_bus_nr && dev > 0)
370 return 0;
371
372 /*
373 * do not read more than one device on the bus directly attached
374 * to RC's (Virtual Bridge's) DS side.
375 */
376 if (bus->primary == pp->root_bus_nr && dev > 0)
377 return 0;
378
379 return 1;
380}
381
382static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
383 int size, u32 *val)
384{
385 struct pcie_port *pp = sys_to_pcie(bus->sysdata);
386 unsigned long flags;
387 int ret;
388
389 if (!pp) {
390 BUG();
391 return -EINVAL;
392 }
393
394 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
395 *val = 0xffffffff;
396 return PCIBIOS_DEVICE_NOT_FOUND;
397 }
398
399 spin_lock_irqsave(&pp->conf_lock, flags);
400 if (bus->number != pp->root_bus_nr)
401 ret = dw_pcie_rd_other_conf(pp, bus, devfn,
402 where, size, val);
403 else
404 ret = dw_pcie_rd_own_conf(pp, where, size, val);
405 spin_unlock_irqrestore(&pp->conf_lock, flags);
406
407 return ret;
408}
409
410static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
411 int where, int size, u32 val)
412{
413 struct pcie_port *pp = sys_to_pcie(bus->sysdata);
414 unsigned long flags;
415 int ret;
416
417 if (!pp) {
418 BUG();
419 return -EINVAL;
420 }
421
422 if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
423 return PCIBIOS_DEVICE_NOT_FOUND;
424
425 spin_lock_irqsave(&pp->conf_lock, flags);
426 if (bus->number != pp->root_bus_nr)
427 ret = dw_pcie_wr_other_conf(pp, bus, devfn,
428 where, size, val);
429 else
430 ret = dw_pcie_wr_own_conf(pp, where, size, val);
431 spin_unlock_irqrestore(&pp->conf_lock, flags);
432
433 return ret;
434}
435
436static struct pci_ops dw_pcie_ops = {
437 .read = dw_pcie_rd_conf,
438 .write = dw_pcie_wr_conf,
439};
440
441int dw_pcie_setup(int nr, struct pci_sys_data *sys)
442{
443 struct pcie_port *pp;
444
445 pp = sys_to_pcie(sys);
446
447 if (!pp)
448 return 0;
449
450 if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
451 sys->io_offset = global_io_offset - pp->config.io_bus_addr;
452 pci_ioremap_io(sys->io_offset, pp->io.start);
453 global_io_offset += SZ_64K;
454 pci_add_resource_offset(&sys->resources, &pp->io,
455 sys->io_offset);
456 }
457
458 sys->mem_offset = pp->mem.start - pp->config.mem_bus_addr;
459 pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
460
461 return 1;
462}
463
464struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
465{
466 struct pci_bus *bus;
467 struct pcie_port *pp = sys_to_pcie(sys);
468
469 if (pp) {
470 pp->root_bus_nr = sys->busnr;
471 bus = pci_scan_root_bus(NULL, sys->busnr, &dw_pcie_ops,
472 sys, &sys->resources);
473 } else {
474 bus = NULL;
475 BUG();
476 }
477
478 return bus;
479}
480
481int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
482{
483 struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
484
485 return pp->irq;
486}
487
488static struct hw_pci dw_pci = {
489 .setup = dw_pcie_setup,
490 .scan = dw_pcie_scan_bus,
491 .map_irq = dw_pcie_map_irq,
492};
493
494void dw_pcie_setup_rc(struct pcie_port *pp)
495{
496 struct pcie_port_info *config = &pp->config;
497 u32 val;
498 u32 membase;
499 u32 memlimit;
500
501 /* set the number of lines as 4 */
502 dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL, &val);
503 val &= ~PORT_LINK_MODE_MASK;
504 switch (pp->lanes) {
505 case 1:
506 val |= PORT_LINK_MODE_1_LANES;
507 break;
508 case 2:
509 val |= PORT_LINK_MODE_2_LANES;
510 break;
511 case 4:
512 val |= PORT_LINK_MODE_4_LANES;
513 break;
514 }
515 dw_pcie_writel_rc(pp, val, PCIE_PORT_LINK_CONTROL);
516
517 /* set link width speed control register */
518 dw_pcie_readl_rc(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
519 val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
520 switch (pp->lanes) {
521 case 1:
522 val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
523 break;
524 case 2:
525 val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
526 break;
527 case 4:
528 val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
529 break;
530 }
531 dw_pcie_writel_rc(pp, val, PCIE_LINK_WIDTH_SPEED_CONTROL);
532
533 /* setup RC BARs */
534 dw_pcie_writel_rc(pp, 0x00000004, PCI_BASE_ADDRESS_0);
535 dw_pcie_writel_rc(pp, 0x00000004, PCI_BASE_ADDRESS_1);
536
537 /* setup interrupt pins */
538 dw_pcie_readl_rc(pp, PCI_INTERRUPT_LINE, &val);
539 val &= 0xffff00ff;
540 val |= 0x00000100;
541 dw_pcie_writel_rc(pp, val, PCI_INTERRUPT_LINE);
542
543 /* setup bus numbers */
544 dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS, &val);
545 val &= 0xff000000;
546 val |= 0x00010100;
547 dw_pcie_writel_rc(pp, val, PCI_PRIMARY_BUS);
548
549 /* setup memory base, memory limit */
550 membase = ((u32)pp->mem_base & 0xfff00000) >> 16;
551 memlimit = (config->mem_size + (u32)pp->mem_base) & 0xfff00000;
552 val = memlimit | membase;
553 dw_pcie_writel_rc(pp, val, PCI_MEMORY_BASE);
554
555 /* setup command register */
556 dw_pcie_readl_rc(pp, PCI_COMMAND, &val);
557 val &= 0xffff0000;
558 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
559 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
560 dw_pcie_writel_rc(pp, val, PCI_COMMAND);
561}
562
563MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
564MODULE_DESCRIPTION("Designware PCIe host controller driver");
565MODULE_LICENSE("GPL v2");