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