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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, "%pOF has no IRQ", rpc->intc_of_node);
211 return -EINVAL;
212 }
213
214 /* disable all interrupts */
215 rt3883_pci_w32(rpc, 0, RT3883_PCI_REG_PCIENA);
216
217 rpc->irq_domain =
218 irq_domain_add_linear(rpc->intc_of_node, RT3883_PCI_IRQ_COUNT,
219 &rt3883_pci_irq_domain_ops,
220 rpc);
221 if (!rpc->irq_domain) {
222 dev_err(dev, "unable to add IRQ domain\n");
223 return -ENODEV;
224 }
225
226 irq_set_chained_handler_and_data(irq, rt3883_pci_irq_handler, rpc);
227
228 return 0;
229}
230
231static int rt3883_pci_config_read(struct pci_bus *bus, unsigned int devfn,
232 int where, int size, u32 *val)
233{
234 struct rt3883_pci_controller *rpc;
235 unsigned long flags;
236 u32 address;
237 u32 data;
238
239 rpc = pci_bus_to_rt3883_controller(bus);
240
241 if (!rpc->pcie_ready && bus->number == 1)
242 return PCIBIOS_DEVICE_NOT_FOUND;
243
244 address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
245 PCI_FUNC(devfn), where);
246
247 rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
248 data = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA);
249
250 switch (size) {
251 case 1:
252 *val = (data >> ((where & 3) << 3)) & 0xff;
253 break;
254 case 2:
255 *val = (data >> ((where & 3) << 3)) & 0xffff;
256 break;
257 case 4:
258 *val = data;
259 break;
260 }
261
262 return PCIBIOS_SUCCESSFUL;
263}
264
265static int rt3883_pci_config_write(struct pci_bus *bus, unsigned int devfn,
266 int where, int size, u32 val)
267{
268 struct rt3883_pci_controller *rpc;
269 unsigned long flags;
270 u32 address;
271 u32 data;
272
273 rpc = pci_bus_to_rt3883_controller(bus);
274
275 if (!rpc->pcie_ready && bus->number == 1)
276 return PCIBIOS_DEVICE_NOT_FOUND;
277
278 address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
279 PCI_FUNC(devfn), where);
280
281 rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
282 data = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA);
283
284 switch (size) {
285 case 1:
286 data = (data & ~(0xff << ((where & 3) << 3))) |
287 (val << ((where & 3) << 3));
288 break;
289 case 2:
290 data = (data & ~(0xffff << ((where & 3) << 3))) |
291 (val << ((where & 3) << 3));
292 break;
293 case 4:
294 data = val;
295 break;
296 }
297
298 rt3883_pci_w32(rpc, data, RT3883_PCI_REG_CFGDATA);
299
300 return PCIBIOS_SUCCESSFUL;
301}
302
303static struct pci_ops rt3883_pci_ops = {
304 .read = rt3883_pci_config_read,
305 .write = rt3883_pci_config_write,
306};
307
308static void rt3883_pci_preinit(struct rt3883_pci_controller *rpc, unsigned mode)
309{
310 u32 syscfg1;
311 u32 rstctrl;
312 u32 clkcfg1;
313 u32 t;
314
315 rstctrl = rt_sysc_r32(RT3883_SYSC_REG_RSTCTRL);
316 syscfg1 = rt_sysc_r32(RT3883_SYSC_REG_SYSCFG1);
317 clkcfg1 = rt_sysc_r32(RT3883_SYSC_REG_CLKCFG1);
318
319 if (mode & RT3883_PCI_MODE_PCIE) {
320 rstctrl |= RT3883_RSTCTRL_PCIE;
321 rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
322
323 /* setup PCI PAD drive mode */
324 syscfg1 &= ~(0x30);
325 syscfg1 |= (2 << 4);
326 rt_sysc_w32(syscfg1, RT3883_SYSC_REG_SYSCFG1);
327
328 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
329 t &= ~BIT(31);
330 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
331
332 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN1);
333 t &= 0x80ffffff;
334 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN1);
335
336 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN1);
337 t |= 0xa << 24;
338 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN1);
339
340 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
341 t |= BIT(31);
342 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
343
344 msleep(50);
345
346 rstctrl &= ~RT3883_RSTCTRL_PCIE;
347 rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
348 }
349
350 syscfg1 |= (RT3883_SYSCFG1_PCIE_RC_MODE | RT3883_SYSCFG1_PCI_HOST_MODE);
351
352 clkcfg1 &= ~(RT3883_CLKCFG1_PCI_CLK_EN | RT3883_CLKCFG1_PCIE_CLK_EN);
353
354 if (mode & RT3883_PCI_MODE_PCI) {
355 clkcfg1 |= RT3883_CLKCFG1_PCI_CLK_EN;
356 rstctrl &= ~RT3883_RSTCTRL_PCI;
357 }
358
359 if (mode & RT3883_PCI_MODE_PCIE) {
360 clkcfg1 |= RT3883_CLKCFG1_PCIE_CLK_EN;
361 rstctrl &= ~RT3883_RSTCTRL_PCIE;
362 }
363
364 rt_sysc_w32(syscfg1, RT3883_SYSC_REG_SYSCFG1);
365 rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
366 rt_sysc_w32(clkcfg1, RT3883_SYSC_REG_CLKCFG1);
367
368 msleep(500);
369
370 /*
371 * setup the device number of the P2P bridge
372 * and de-assert the reset line
373 */
374 t = (RT3883_P2P_BR_DEVNUM << RT3883_PCICFG_P2P_BR_DEVNUM_S);
375 rt3883_pci_w32(rpc, t, RT3883_PCI_REG_PCICFG);
376
377 /* flush write */
378 rt3883_pci_r32(rpc, RT3883_PCI_REG_PCICFG);
379 msleep(500);
380
381 if (mode & RT3883_PCI_MODE_PCIE) {
382 msleep(500);
383
384 t = rt3883_pci_r32(rpc, RT3883_PCI_REG_STATUS(1));
385
386 rpc->pcie_ready = t & BIT(0);
387
388 if (!rpc->pcie_ready) {
389 /* reset the PCIe block */
390 t = rt_sysc_r32(RT3883_SYSC_REG_RSTCTRL);
391 t |= RT3883_RSTCTRL_PCIE;
392 rt_sysc_w32(t, RT3883_SYSC_REG_RSTCTRL);
393 t &= ~RT3883_RSTCTRL_PCIE;
394 rt_sysc_w32(t, RT3883_SYSC_REG_RSTCTRL);
395
396 /* turn off PCIe clock */
397 t = rt_sysc_r32(RT3883_SYSC_REG_CLKCFG1);
398 t &= ~RT3883_CLKCFG1_PCIE_CLK_EN;
399 rt_sysc_w32(t, RT3883_SYSC_REG_CLKCFG1);
400
401 t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
402 t &= ~0xf000c080;
403 rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
404 }
405 }
406
407 /* enable PCI arbiter */
408 rt3883_pci_w32(rpc, 0x79, RT3883_PCI_REG_ARBCTL);
409}
410
411static int rt3883_pci_probe(struct platform_device *pdev)
412{
413 struct rt3883_pci_controller *rpc;
414 struct device *dev = &pdev->dev;
415 struct device_node *np = dev->of_node;
416 struct resource *res;
417 struct device_node *child;
418 u32 val;
419 int err;
420 int mode;
421
422 rpc = devm_kzalloc(dev, sizeof(*rpc), GFP_KERNEL);
423 if (!rpc)
424 return -ENOMEM;
425
426 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
427 rpc->base = devm_ioremap_resource(dev, res);
428 if (IS_ERR(rpc->base))
429 return PTR_ERR(rpc->base);
430
431 /* find the interrupt controller child node */
432 for_each_child_of_node(np, child) {
433 if (of_get_property(child, "interrupt-controller", NULL)) {
434 rpc->intc_of_node = child;
435 break;
436 }
437 }
438
439 if (!rpc->intc_of_node) {
440 dev_err(dev, "%pOF has no %s child node",
441 rpc->intc_of_node,
442 "interrupt controller");
443 return -EINVAL;
444 }
445
446 /* find the PCI host bridge child node */
447 for_each_child_of_node(np, child) {
448 if (child->type &&
449 of_node_cmp(child->type, "pci") == 0) {
450 rpc->pci_controller.of_node = child;
451 break;
452 }
453 }
454
455 if (!rpc->pci_controller.of_node) {
456 dev_err(dev, "%pOF has no %s child node",
457 rpc->intc_of_node,
458 "PCI host bridge");
459 err = -EINVAL;
460 goto err_put_intc_node;
461 }
462
463 mode = RT3883_PCI_MODE_NONE;
464 for_each_available_child_of_node(rpc->pci_controller.of_node, child) {
465 int devfn;
466
467 if (!child->type ||
468 of_node_cmp(child->type, "pci") != 0)
469 continue;
470
471 devfn = of_pci_get_devfn(child);
472 if (devfn < 0)
473 continue;
474
475 switch (PCI_SLOT(devfn)) {
476 case 1:
477 mode |= RT3883_PCI_MODE_PCIE;
478 break;
479
480 case 17:
481 case 18:
482 mode |= RT3883_PCI_MODE_PCI;
483 break;
484 }
485 }
486
487 if (mode == RT3883_PCI_MODE_NONE) {
488 dev_err(dev, "unable to determine PCI mode\n");
489 err = -EINVAL;
490 goto err_put_hb_node;
491 }
492
493 dev_info(dev, "mode:%s%s\n",
494 (mode & RT3883_PCI_MODE_PCI) ? " PCI" : "",
495 (mode & RT3883_PCI_MODE_PCIE) ? " PCIe" : "");
496
497 rt3883_pci_preinit(rpc, mode);
498
499 rpc->pci_controller.pci_ops = &rt3883_pci_ops;
500 rpc->pci_controller.io_resource = &rpc->io_res;
501 rpc->pci_controller.mem_resource = &rpc->mem_res;
502
503 /* Load PCI I/O and memory resources from DT */
504 pci_load_of_ranges(&rpc->pci_controller,
505 rpc->pci_controller.of_node);
506
507 rt3883_pci_w32(rpc, rpc->mem_res.start, RT3883_PCI_REG_MEMBASE);
508 rt3883_pci_w32(rpc, rpc->io_res.start, RT3883_PCI_REG_IOBASE);
509
510 ioport_resource.start = rpc->io_res.start;
511 ioport_resource.end = rpc->io_res.end;
512
513 /* PCI */
514 rt3883_pci_w32(rpc, 0x03ff0000, RT3883_PCI_REG_BAR0SETUP(0));
515 rt3883_pci_w32(rpc, RT3883_MEMORY_BASE, RT3883_PCI_REG_IMBASEBAR0(0));
516 rt3883_pci_w32(rpc, 0x08021814, RT3883_PCI_REG_ID(0));
517 rt3883_pci_w32(rpc, 0x00800001, RT3883_PCI_REG_CLASS(0));
518 rt3883_pci_w32(rpc, 0x28801814, RT3883_PCI_REG_SUBID(0));
519
520 /* PCIe */
521 rt3883_pci_w32(rpc, 0x03ff0000, RT3883_PCI_REG_BAR0SETUP(1));
522 rt3883_pci_w32(rpc, RT3883_MEMORY_BASE, RT3883_PCI_REG_IMBASEBAR0(1));
523 rt3883_pci_w32(rpc, 0x08021814, RT3883_PCI_REG_ID(1));
524 rt3883_pci_w32(rpc, 0x06040001, RT3883_PCI_REG_CLASS(1));
525 rt3883_pci_w32(rpc, 0x28801814, RT3883_PCI_REG_SUBID(1));
526
527 err = rt3883_pci_irq_init(dev, rpc);
528 if (err)
529 goto err_put_hb_node;
530
531 /* PCIe */
532 val = rt3883_pci_read_cfg32(rpc, 0, 0x01, 0, PCI_COMMAND);
533 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
534 rt3883_pci_write_cfg32(rpc, 0, 0x01, 0, PCI_COMMAND, val);
535
536 /* PCI */
537 val = rt3883_pci_read_cfg32(rpc, 0, 0x00, 0, PCI_COMMAND);
538 val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
539 rt3883_pci_write_cfg32(rpc, 0, 0x00, 0, PCI_COMMAND, val);
540
541 if (mode == RT3883_PCI_MODE_PCIE) {
542 rt3883_pci_w32(rpc, 0x03ff0001, RT3883_PCI_REG_BAR0SETUP(0));
543 rt3883_pci_w32(rpc, 0x03ff0001, RT3883_PCI_REG_BAR0SETUP(1));
544
545 rt3883_pci_write_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
546 PCI_BASE_ADDRESS_0,
547 RT3883_MEMORY_BASE);
548 /* flush write */
549 rt3883_pci_read_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
550 PCI_BASE_ADDRESS_0);
551 } else {
552 rt3883_pci_write_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
553 PCI_IO_BASE, 0x00000101);
554 }
555
556 register_pci_controller(&rpc->pci_controller);
557
558 return 0;
559
560err_put_hb_node:
561 of_node_put(rpc->pci_controller.of_node);
562err_put_intc_node:
563 of_node_put(rpc->intc_of_node);
564 return err;
565}
566
567int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
568{
569 return of_irq_parse_and_map_pci(dev, slot, pin);
570}
571
572int pcibios_plat_dev_init(struct pci_dev *dev)
573{
574 return 0;
575}
576
577static const struct of_device_id rt3883_pci_ids[] = {
578 { .compatible = "ralink,rt3883-pci" },
579 {},
580};
581
582static struct platform_driver rt3883_pci_driver = {
583 .probe = rt3883_pci_probe,
584 .driver = {
585 .name = "rt3883-pci",
586 .of_match_table = of_match_ptr(rt3883_pci_ids),
587 },
588};
589
590static int __init rt3883_pci_init(void)
591{
592 return platform_driver_register(&rt3883_pci_driver);
593}
594
595postcore_initcall(rt3883_pci_init);