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1/*
2 * Ralink RT3662/RT3883 SoC PCI support
3 *
4 * Copyright (C) 2011-2013 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * Parts of this file are based on Ralink's 2.6.21 BSP
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 */
12
13#include <linux/types.h>
14#include <linux/pci.h>
15#include <linux/io.h>
16#include <linux/init.h>
17#include <linux/delay.h>
18#include <linux/interrupt.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/of_irq.h>
22#include <linux/of_pci.h>
23#include <linux/platform_device.h>
24
25#include <asm/mach-ralink/rt3883.h>
26#include <asm/mach-ralink/ralink_regs.h>
27
28#define RT3883_MEMORY_BASE 0x00000000
29#define RT3883_MEMORY_SIZE 0x02000000
30
31#define RT3883_PCI_REG_PCICFG 0x00
32#define RT3883_PCICFG_P2P_BR_DEVNUM_M 0xf
33#define RT3883_PCICFG_P2P_BR_DEVNUM_S 16
34#define RT3883_PCICFG_PCIRST BIT(1)
35#define RT3883_PCI_REG_PCIRAW 0x04
36#define RT3883_PCI_REG_PCIINT 0x08
37#define RT3883_PCI_REG_PCIENA 0x0c
38
39#define RT3883_PCI_REG_CFGADDR 0x20
40#define RT3883_PCI_REG_CFGDATA 0x24
41#define RT3883_PCI_REG_MEMBASE 0x28
42#define RT3883_PCI_REG_IOBASE 0x2c
43#define RT3883_PCI_REG_ARBCTL 0x80
44
45#define RT3883_PCI_REG_BASE(_x) (0x1000 + (_x) * 0x1000)
46#define RT3883_PCI_REG_BAR0SETUP(_x) (RT3883_PCI_REG_BASE((_x)) + 0x10)
47#define RT3883_PCI_REG_IMBASEBAR0(_x) (RT3883_PCI_REG_BASE((_x)) + 0x18)
48#define RT3883_PCI_REG_ID(_x) (RT3883_PCI_REG_BASE((_x)) + 0x30)
49#define RT3883_PCI_REG_CLASS(_x) (RT3883_PCI_REG_BASE((_x)) + 0x34)
50#define RT3883_PCI_REG_SUBID(_x) (RT3883_PCI_REG_BASE((_x)) + 0x38)
51#define RT3883_PCI_REG_STATUS(_x) (RT3883_PCI_REG_BASE((_x)) + 0x50)
52
53#define RT3883_PCI_MODE_NONE 0
54#define RT3883_PCI_MODE_PCI BIT(0)
55#define RT3883_PCI_MODE_PCIE BIT(1)
56#define RT3883_PCI_MODE_BOTH (RT3883_PCI_MODE_PCI | RT3883_PCI_MODE_PCIE)
57
58#define RT3883_PCI_IRQ_COUNT 32
59
60#define RT3883_P2P_BR_DEVNUM 1
61
62struct rt3883_pci_controller {
63 void __iomem *base;
64
65 struct device_node *intc_of_node;
66 struct irq_domain *irq_domain;
67
68 struct pci_controller pci_controller;
69 struct resource io_res;
70 struct resource mem_res;
71
72 bool pcie_ready;
73};
74
75static inline struct rt3883_pci_controller *
76pci_bus_to_rt3883_controller(struct pci_bus *bus)
77{
78 struct pci_controller *hose;
79
80 hose = (struct pci_controller *) bus->sysdata;
81 return container_of(hose, struct rt3883_pci_controller, pci_controller);
82}
83
84static inline u32 rt3883_pci_r32(struct rt3883_pci_controller *rpc,
85 unsigned reg)
86{
87 return ioread32(rpc->base + reg);
88}
89
90static inline void rt3883_pci_w32(struct rt3883_pci_controller *rpc,
91 u32 val, unsigned reg)
92{
93 iowrite32(val, rpc->base + reg);
94}
95
96static inline u32 rt3883_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
97 unsigned int func, unsigned int where)
98{
99 return (bus << 16) | (slot << 11) | (func << 8) | (where & 0xfc) |
100 0x80000000;
101}
102
103static u32 rt3883_pci_read_cfg32(struct rt3883_pci_controller *rpc,
104 unsigned bus, unsigned slot,
105 unsigned func, unsigned reg)
106{
107 unsigned long flags;
108 u32 address;
109 u32 ret;
110
111 address = rt3883_pci_get_cfgaddr(bus, slot, func, reg);
112
113 rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
114 ret = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA);
115
116 return ret;
117}
118
119static void rt3883_pci_write_cfg32(struct rt3883_pci_controller *rpc,
120 unsigned bus, unsigned slot,
121 unsigned func, unsigned reg, u32 val)
122{
123 unsigned long flags;
124 u32 address;
125
126 address = rt3883_pci_get_cfgaddr(bus, slot, func, reg);
127
128 rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
129 rt3883_pci_w32(rpc, val, RT3883_PCI_REG_CFGDATA);
130}
131
132static void rt3883_pci_irq_handler(struct irq_desc *desc)
133{
134 struct rt3883_pci_controller *rpc;
135 u32 pending;
136
137 rpc = irq_desc_get_handler_data(desc);
138
139 pending = rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIINT) &
140 rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
141
142 if (!pending) {
143 spurious_interrupt();
144 return;
145 }
146
147 while (pending) {
148 unsigned irq, bit = __ffs(pending);
149
150 irq = irq_find_mapping(rpc->irq_domain, bit);
151 generic_handle_irq(irq);
152
153 pending &= ~BIT(bit);
154 }
155}
156
157static void rt3883_pci_irq_unmask(struct irq_data *d)
158{
159 struct rt3883_pci_controller *rpc;
160 u32 t;
161
162 rpc = irq_data_get_irq_chip_data(d);
163
164 t = rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
165 rt3883_pci_w32(rpc, t | BIT(d->hwirq), RT3883_PCI_REG_PCIENA);
166 /* flush write */
167 rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
168}
169
170static void rt3883_pci_irq_mask(struct irq_data *d)
171{
172 struct rt3883_pci_controller *rpc;
173 u32 t;
174
175 rpc = irq_data_get_irq_chip_data(d);
176
177 t = rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
178 rt3883_pci_w32(rpc, t & ~BIT(d->hwirq), RT3883_PCI_REG_PCIENA);
179 /* flush write */
180 rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
181}
182
183static struct irq_chip rt3883_pci_irq_chip = {
184 .name = "RT3883 PCI",
185 .irq_mask = rt3883_pci_irq_mask,
186 .irq_unmask = rt3883_pci_irq_unmask,
187 .irq_mask_ack = rt3883_pci_irq_mask,
188};
189
190static int rt3883_pci_irq_map(struct irq_domain *d, unsigned int irq,
191 irq_hw_number_t hw)
192{
193 irq_set_chip_and_handler(irq, &rt3883_pci_irq_chip, handle_level_irq);
194 irq_set_chip_data(irq, d->host_data);
195
196 return 0;
197}
198
199static const struct irq_domain_ops rt3883_pci_irq_domain_ops = {
200 .map = rt3883_pci_irq_map,
201 .xlate = irq_domain_xlate_onecell,
202};
203
204static int rt3883_pci_irq_init(struct device *dev,
205 struct rt3883_pci_controller *rpc)
206{
207 int irq;
208
209 irq = irq_of_parse_and_map(rpc->intc_of_node, 0);
210 if (irq == 0) {
211 dev_err(dev, "%s has no IRQ",
212 of_node_full_name(rpc->intc_of_node));
213 return -EINVAL;
214 }
215
216 /* disable all interrupts */
217 rt3883_pci_w32(rpc, 0, RT3883_PCI_REG_PCIENA);
218
219 rpc->irq_domain =
220 irq_domain_add_linear(rpc->intc_of_node, RT3883_PCI_IRQ_COUNT,
221 &rt3883_pci_irq_domain_ops,
222 rpc);
223 if (!rpc->irq_domain) {
224 dev_err(dev, "unable to add IRQ domain\n");
225 return -ENODEV;
226 }
227
228 irq_set_chained_handler_and_data(irq, rt3883_pci_irq_handler, rpc);
229
230 return 0;
231}
232
233static int rt3883_pci_config_read(struct pci_bus *bus, unsigned int devfn,
234 int where, int size, u32 *val)
235{
236 struct rt3883_pci_controller *rpc;
237 unsigned long flags;
238 u32 address;
239 u32 data;
240
241 rpc = pci_bus_to_rt3883_controller(bus);
242
243 if (!rpc->pcie_ready && bus->number == 1)
244 return PCIBIOS_DEVICE_NOT_FOUND;
245
246 address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
247 PCI_FUNC(devfn), where);
248
249 rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
250 data = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA);
251
252 switch (size) {
253 case 1:
254 *val = (data >> ((where & 3) << 3)) & 0xff;
255 break;
256 case 2:
257 *val = (data >> ((where & 3) << 3)) & 0xffff;
258 break;
259 case 4:
260 *val = data;
261 break;
262 }
263
264 return PCIBIOS_SUCCESSFUL;
265}
266
267static int rt3883_pci_config_write(struct pci_bus *bus, unsigned int devfn,
268 int where, int size, u32 val)
269{
270 struct rt3883_pci_controller *rpc;
271 unsigned long flags;
272 u32 address;
273 u32 data;
274
275 rpc = pci_bus_to_rt3883_controller(bus);
276
277 if (!rpc->pcie_ready && bus->number == 1)
278 return PCIBIOS_DEVICE_NOT_FOUND;
279
280 address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
281 PCI_FUNC(devfn), where);
282
283 rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
284 data = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA);
285
286 switch (size) {
287 case 1:
288 data = (data & ~(0xff << ((where & 3) << 3))) |
289 (val << ((where & 3) << 3));
290 break;
291 case 2:
292 data = (data & ~(0xffff << ((where & 3) << 3))) |
293 (val << ((where & 3) << 3));
294 break;
295 case 4:
296 data = val;
297 break;
298 }
299
300 rt3883_pci_w32(rpc, data, RT3883_PCI_REG_CFGDATA);
301
302 return PCIBIOS_SUCCESSFUL;
303}
304
305static struct pci_ops rt3883_pci_ops = {
306 .read = rt3883_pci_config_read,
307 .write = rt3883_pci_config_write,
308};
309
310static void rt3883_pci_preinit(struct rt3883_pci_controller *rpc, unsigned mode)
311{
312 u32 syscfg1;
313 u32 rstctrl;
314 u32 clkcfg1;
315 u32 t;
316
317 rstctrl = rt_sysc_r32(RT3883_SYSC_REG_RSTCTRL);
318 syscfg1 = rt_sysc_r32(RT3883_SYSC_REG_SYSCFG1);
319 clkcfg1 = rt_sysc_r32(RT3883_SYSC_REG_CLKCFG1);
320
321 if (mode & RT3883_PCI_MODE_PCIE) {
322 rstctrl |= RT3883_RSTCTRL_PCIE;
323 rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
324
325 /* setup PCI PAD drive mode */
326 syscfg1 &= ~(0x30);
327 syscfg1 |= (2 << 4);
328 rt_sysc_w32(syscfg1, RT3883_SYSC_REG_SYSCFG1);
329
330 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
331 t &= ~BIT(31);
332 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
333
334 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN1);
335 t &= 0x80ffffff;
336 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN1);
337
338 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN1);
339 t |= 0xa << 24;
340 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN1);
341
342 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
343 t |= BIT(31);
344 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
345
346 msleep(50);
347
348 rstctrl &= ~RT3883_RSTCTRL_PCIE;
349 rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
350 }
351
352 syscfg1 |= (RT3883_SYSCFG1_PCIE_RC_MODE | RT3883_SYSCFG1_PCI_HOST_MODE);
353
354 clkcfg1 &= ~(RT3883_CLKCFG1_PCI_CLK_EN | RT3883_CLKCFG1_PCIE_CLK_EN);
355
356 if (mode & RT3883_PCI_MODE_PCI) {
357 clkcfg1 |= RT3883_CLKCFG1_PCI_CLK_EN;
358 rstctrl &= ~RT3883_RSTCTRL_PCI;
359 }
360
361 if (mode & RT3883_PCI_MODE_PCIE) {
362 clkcfg1 |= RT3883_CLKCFG1_PCIE_CLK_EN;
363 rstctrl &= ~RT3883_RSTCTRL_PCIE;
364 }
365
366 rt_sysc_w32(syscfg1, RT3883_SYSC_REG_SYSCFG1);
367 rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
368 rt_sysc_w32(clkcfg1, RT3883_SYSC_REG_CLKCFG1);
369
370 msleep(500);
371
372 /*
373 * setup the device number of the P2P bridge
374 * and de-assert the reset line
375 */
376 t = (RT3883_P2P_BR_DEVNUM << RT3883_PCICFG_P2P_BR_DEVNUM_S);
377 rt3883_pci_w32(rpc, t, RT3883_PCI_REG_PCICFG);
378
379 /* flush write */
380 rt3883_pci_r32(rpc, RT3883_PCI_REG_PCICFG);
381 msleep(500);
382
383 if (mode & RT3883_PCI_MODE_PCIE) {
384 msleep(500);
385
386 t = rt3883_pci_r32(rpc, RT3883_PCI_REG_STATUS(1));
387
388 rpc->pcie_ready = t & BIT(0);
389
390 if (!rpc->pcie_ready) {
391 /* reset the PCIe block */
392 t = rt_sysc_r32(RT3883_SYSC_REG_RSTCTRL);
393 t |= RT3883_RSTCTRL_PCIE;
394 rt_sysc_w32(t, RT3883_SYSC_REG_RSTCTRL);
395 t &= ~RT3883_RSTCTRL_PCIE;
396 rt_sysc_w32(t, RT3883_SYSC_REG_RSTCTRL);
397
398 /* turn off PCIe clock */
399 t = rt_sysc_r32(RT3883_SYSC_REG_CLKCFG1);
400 t &= ~RT3883_CLKCFG1_PCIE_CLK_EN;
401 rt_sysc_w32(t, RT3883_SYSC_REG_CLKCFG1);
402
403 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
404 t &= ~0xf000c080;
405 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
406 }
407 }
408
409 /* enable PCI arbiter */
410 rt3883_pci_w32(rpc, 0x79, RT3883_PCI_REG_ARBCTL);
411}
412
413static int rt3883_pci_probe(struct platform_device *pdev)
414{
415 struct rt3883_pci_controller *rpc;
416 struct device *dev = &pdev->dev;
417 struct device_node *np = dev->of_node;
418 struct resource *res;
419 struct device_node *child;
420 u32 val;
421 int err;
422 int mode;
423
424 rpc = devm_kzalloc(dev, sizeof(*rpc), GFP_KERNEL);
425 if (!rpc)
426 return -ENOMEM;
427
428 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
429 rpc->base = devm_ioremap_resource(dev, res);
430 if (IS_ERR(rpc->base))
431 return PTR_ERR(rpc->base);
432
433 /* find the interrupt controller child node */
434 for_each_child_of_node(np, child) {
435 if (of_get_property(child, "interrupt-controller", NULL)) {
436 rpc->intc_of_node = child;
437 break;
438 }
439 }
440
441 if (!rpc->intc_of_node) {
442 dev_err(dev, "%s has no %s child node",
443 of_node_full_name(rpc->intc_of_node),
444 "interrupt controller");
445 return -EINVAL;
446 }
447
448 /* find the PCI host bridge child node */
449 for_each_child_of_node(np, child) {
450 if (child->type &&
451 of_node_cmp(child->type, "pci") == 0) {
452 rpc->pci_controller.of_node = child;
453 break;
454 }
455 }
456
457 if (!rpc->pci_controller.of_node) {
458 dev_err(dev, "%s has no %s child node",
459 of_node_full_name(rpc->intc_of_node),
460 "PCI host bridge");
461 err = -EINVAL;
462 goto err_put_intc_node;
463 }
464
465 mode = RT3883_PCI_MODE_NONE;
466 for_each_available_child_of_node(rpc->pci_controller.of_node, child) {
467 int devfn;
468
469 if (!child->type ||
470 of_node_cmp(child->type, "pci") != 0)
471 continue;
472
473 devfn = of_pci_get_devfn(child);
474 if (devfn < 0)
475 continue;
476
477 switch (PCI_SLOT(devfn)) {
478 case 1:
479 mode |= RT3883_PCI_MODE_PCIE;
480 break;
481
482 case 17:
483 case 18:
484 mode |= RT3883_PCI_MODE_PCI;
485 break;
486 }
487 }
488
489 if (mode == RT3883_PCI_MODE_NONE) {
490 dev_err(dev, "unable to determine PCI mode\n");
491 err = -EINVAL;
492 goto err_put_hb_node;
493 }
494
495 dev_info(dev, "mode:%s%s\n",
496 (mode & RT3883_PCI_MODE_PCI) ? " PCI" : "",
497 (mode & RT3883_PCI_MODE_PCIE) ? " PCIe" : "");
498
499 rt3883_pci_preinit(rpc, mode);
500
501 rpc->pci_controller.pci_ops = &rt3883_pci_ops;
502 rpc->pci_controller.io_resource = &rpc->io_res;
503 rpc->pci_controller.mem_resource = &rpc->mem_res;
504
505 /* Load PCI I/O and memory resources from DT */
506 pci_load_of_ranges(&rpc->pci_controller,
507 rpc->pci_controller.of_node);
508
509 rt3883_pci_w32(rpc, rpc->mem_res.start, RT3883_PCI_REG_MEMBASE);
510 rt3883_pci_w32(rpc, rpc->io_res.start, RT3883_PCI_REG_IOBASE);
511
512 ioport_resource.start = rpc->io_res.start;
513 ioport_resource.end = rpc->io_res.end;
514
515 /* PCI */
516 rt3883_pci_w32(rpc, 0x03ff0000, RT3883_PCI_REG_BAR0SETUP(0));
517 rt3883_pci_w32(rpc, RT3883_MEMORY_BASE, RT3883_PCI_REG_IMBASEBAR0(0));
518 rt3883_pci_w32(rpc, 0x08021814, RT3883_PCI_REG_ID(0));
519 rt3883_pci_w32(rpc, 0x00800001, RT3883_PCI_REG_CLASS(0));
520 rt3883_pci_w32(rpc, 0x28801814, RT3883_PCI_REG_SUBID(0));
521
522 /* PCIe */
523 rt3883_pci_w32(rpc, 0x03ff0000, RT3883_PCI_REG_BAR0SETUP(1));
524 rt3883_pci_w32(rpc, RT3883_MEMORY_BASE, RT3883_PCI_REG_IMBASEBAR0(1));
525 rt3883_pci_w32(rpc, 0x08021814, RT3883_PCI_REG_ID(1));
526 rt3883_pci_w32(rpc, 0x06040001, RT3883_PCI_REG_CLASS(1));
527 rt3883_pci_w32(rpc, 0x28801814, RT3883_PCI_REG_SUBID(1));
528
529 err = rt3883_pci_irq_init(dev, rpc);
530 if (err)
531 goto err_put_hb_node;
532
533 /* PCIe */
534 val = rt3883_pci_read_cfg32(rpc, 0, 0x01, 0, PCI_COMMAND);
535 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
536 rt3883_pci_write_cfg32(rpc, 0, 0x01, 0, PCI_COMMAND, val);
537
538 /* PCI */
539 val = rt3883_pci_read_cfg32(rpc, 0, 0x00, 0, PCI_COMMAND);
540 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
541 rt3883_pci_write_cfg32(rpc, 0, 0x00, 0, PCI_COMMAND, val);
542
543 if (mode == RT3883_PCI_MODE_PCIE) {
544 rt3883_pci_w32(rpc, 0x03ff0001, RT3883_PCI_REG_BAR0SETUP(0));
545 rt3883_pci_w32(rpc, 0x03ff0001, RT3883_PCI_REG_BAR0SETUP(1));
546
547 rt3883_pci_write_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
548 PCI_BASE_ADDRESS_0,
549 RT3883_MEMORY_BASE);
550 /* flush write */
551 rt3883_pci_read_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
552 PCI_BASE_ADDRESS_0);
553 } else {
554 rt3883_pci_write_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
555 PCI_IO_BASE, 0x00000101);
556 }
557
558 register_pci_controller(&rpc->pci_controller);
559
560 return 0;
561
562err_put_hb_node:
563 of_node_put(rpc->pci_controller.of_node);
564err_put_intc_node:
565 of_node_put(rpc->intc_of_node);
566 return err;
567}
568
569int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
570{
571 return of_irq_parse_and_map_pci(dev, slot, pin);
572}
573
574int pcibios_plat_dev_init(struct pci_dev *dev)
575{
576 return 0;
577}
578
579static const struct of_device_id rt3883_pci_ids[] = {
580 { .compatible = "ralink,rt3883-pci" },
581 {},
582};
583MODULE_DEVICE_TABLE(of, rt3883_pci_ids);
584
585static struct platform_driver rt3883_pci_driver = {
586 .probe = rt3883_pci_probe,
587 .driver = {
588 .name = "rt3883-pci",
589 .of_match_table = of_match_ptr(rt3883_pci_ids),
590 },
591};
592
593static int __init rt3883_pci_init(void)
594{
595 return platform_driver_register(&rt3883_pci_driver);
596}
597
598postcore_initcall(rt3883_pci_init);