xref: /openbmc/linux/arch/mips/pci/pci-rt3883.c (revision 9c99b488)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Ralink RT3662/RT3883 SoC PCI support
4  *
5  *  Copyright (C) 2011-2013 Gabor Juhos <juhosg@openwrt.org>
6  *
7  *  Parts of this file are based on Ralink's 2.6.21 BSP
8  */
9 
10 #include <linux/types.h>
11 #include <linux/pci.h>
12 #include <linux/io.h>
13 #include <linux/init.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/irqdomain.h>
17 #include <linux/of.h>
18 #include <linux/of_irq.h>
19 #include <linux/of_pci.h>
20 #include <linux/platform_device.h>
21 
22 #include <asm/mach-ralink/rt3883.h>
23 #include <asm/mach-ralink/ralink_regs.h>
24 
25 #define RT3883_MEMORY_BASE		0x00000000
26 #define RT3883_MEMORY_SIZE		0x02000000
27 
28 #define RT3883_PCI_REG_PCICFG		0x00
29 #define   RT3883_PCICFG_P2P_BR_DEVNUM_M 0xf
30 #define   RT3883_PCICFG_P2P_BR_DEVNUM_S 16
31 #define   RT3883_PCICFG_PCIRST		BIT(1)
32 #define RT3883_PCI_REG_PCIRAW		0x04
33 #define RT3883_PCI_REG_PCIINT		0x08
34 #define RT3883_PCI_REG_PCIENA		0x0c
35 
36 #define RT3883_PCI_REG_CFGADDR		0x20
37 #define RT3883_PCI_REG_CFGDATA		0x24
38 #define RT3883_PCI_REG_MEMBASE		0x28
39 #define RT3883_PCI_REG_IOBASE		0x2c
40 #define RT3883_PCI_REG_ARBCTL		0x80
41 
42 #define RT3883_PCI_REG_BASE(_x)		(0x1000 + (_x) * 0x1000)
43 #define RT3883_PCI_REG_BAR0SETUP(_x)	(RT3883_PCI_REG_BASE((_x)) + 0x10)
44 #define RT3883_PCI_REG_IMBASEBAR0(_x)	(RT3883_PCI_REG_BASE((_x)) + 0x18)
45 #define RT3883_PCI_REG_ID(_x)		(RT3883_PCI_REG_BASE((_x)) + 0x30)
46 #define RT3883_PCI_REG_CLASS(_x)	(RT3883_PCI_REG_BASE((_x)) + 0x34)
47 #define RT3883_PCI_REG_SUBID(_x)	(RT3883_PCI_REG_BASE((_x)) + 0x38)
48 #define RT3883_PCI_REG_STATUS(_x)	(RT3883_PCI_REG_BASE((_x)) + 0x50)
49 
50 #define RT3883_PCI_MODE_NONE	0
51 #define RT3883_PCI_MODE_PCI	BIT(0)
52 #define RT3883_PCI_MODE_PCIE	BIT(1)
53 #define RT3883_PCI_MODE_BOTH	(RT3883_PCI_MODE_PCI | RT3883_PCI_MODE_PCIE)
54 
55 #define RT3883_PCI_IRQ_COUNT	32
56 
57 #define RT3883_P2P_BR_DEVNUM	1
58 
59 struct rt3883_pci_controller {
60 	void __iomem *base;
61 
62 	struct device_node *intc_of_node;
63 	struct irq_domain *irq_domain;
64 
65 	struct pci_controller pci_controller;
66 	struct resource io_res;
67 	struct resource mem_res;
68 
69 	bool pcie_ready;
70 };
71 
72 static inline struct rt3883_pci_controller *
pci_bus_to_rt3883_controller(struct pci_bus * bus)73 pci_bus_to_rt3883_controller(struct pci_bus *bus)
74 {
75 	struct pci_controller *hose;
76 
77 	hose = (struct pci_controller *) bus->sysdata;
78 	return container_of(hose, struct rt3883_pci_controller, pci_controller);
79 }
80 
rt3883_pci_r32(struct rt3883_pci_controller * rpc,unsigned reg)81 static inline u32 rt3883_pci_r32(struct rt3883_pci_controller *rpc,
82 				 unsigned reg)
83 {
84 	return ioread32(rpc->base + reg);
85 }
86 
rt3883_pci_w32(struct rt3883_pci_controller * rpc,u32 val,unsigned reg)87 static inline void rt3883_pci_w32(struct rt3883_pci_controller *rpc,
88 				  u32 val, unsigned reg)
89 {
90 	iowrite32(val, rpc->base + reg);
91 }
92 
rt3883_pci_get_cfgaddr(unsigned int bus,unsigned int slot,unsigned int func,unsigned int where)93 static inline u32 rt3883_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
94 					 unsigned int func, unsigned int where)
95 {
96 	return (bus << 16) | (slot << 11) | (func << 8) | (where & 0xfc) |
97 	       0x80000000;
98 }
99 
rt3883_pci_read_cfg32(struct rt3883_pci_controller * rpc,unsigned bus,unsigned slot,unsigned func,unsigned reg)100 static u32 rt3883_pci_read_cfg32(struct rt3883_pci_controller *rpc,
101 			       unsigned bus, unsigned slot,
102 			       unsigned func, unsigned reg)
103 {
104 	u32 address;
105 
106 	address = rt3883_pci_get_cfgaddr(bus, slot, func, reg);
107 
108 	rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
109 
110 	return rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA);
111 }
112 
rt3883_pci_write_cfg32(struct rt3883_pci_controller * rpc,unsigned bus,unsigned slot,unsigned func,unsigned reg,u32 val)113 static void rt3883_pci_write_cfg32(struct rt3883_pci_controller *rpc,
114 				 unsigned bus, unsigned slot,
115 				 unsigned func, unsigned reg, u32 val)
116 {
117 	u32 address;
118 
119 	address = rt3883_pci_get_cfgaddr(bus, slot, func, reg);
120 
121 	rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
122 	rt3883_pci_w32(rpc, val, RT3883_PCI_REG_CFGDATA);
123 }
124 
rt3883_pci_irq_handler(struct irq_desc * desc)125 static void rt3883_pci_irq_handler(struct irq_desc *desc)
126 {
127 	struct rt3883_pci_controller *rpc;
128 	u32 pending;
129 
130 	rpc = irq_desc_get_handler_data(desc);
131 
132 	pending = rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIINT) &
133 		  rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
134 
135 	if (!pending) {
136 		spurious_interrupt();
137 		return;
138 	}
139 
140 	while (pending) {
141 		unsigned bit = __ffs(pending);
142 
143 		generic_handle_domain_irq(rpc->irq_domain, bit);
144 
145 		pending &= ~BIT(bit);
146 	}
147 }
148 
rt3883_pci_irq_unmask(struct irq_data * d)149 static void rt3883_pci_irq_unmask(struct irq_data *d)
150 {
151 	struct rt3883_pci_controller *rpc;
152 	u32 t;
153 
154 	rpc = irq_data_get_irq_chip_data(d);
155 
156 	t = rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
157 	rt3883_pci_w32(rpc, t | BIT(d->hwirq), RT3883_PCI_REG_PCIENA);
158 	/* flush write */
159 	rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
160 }
161 
rt3883_pci_irq_mask(struct irq_data * d)162 static void rt3883_pci_irq_mask(struct irq_data *d)
163 {
164 	struct rt3883_pci_controller *rpc;
165 	u32 t;
166 
167 	rpc = irq_data_get_irq_chip_data(d);
168 
169 	t = rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
170 	rt3883_pci_w32(rpc, t & ~BIT(d->hwirq), RT3883_PCI_REG_PCIENA);
171 	/* flush write */
172 	rt3883_pci_r32(rpc, RT3883_PCI_REG_PCIENA);
173 }
174 
175 static struct irq_chip rt3883_pci_irq_chip = {
176 	.name		= "RT3883 PCI",
177 	.irq_mask	= rt3883_pci_irq_mask,
178 	.irq_unmask	= rt3883_pci_irq_unmask,
179 	.irq_mask_ack	= rt3883_pci_irq_mask,
180 };
181 
rt3883_pci_irq_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)182 static int rt3883_pci_irq_map(struct irq_domain *d, unsigned int irq,
183 			      irq_hw_number_t hw)
184 {
185 	irq_set_chip_and_handler(irq, &rt3883_pci_irq_chip, handle_level_irq);
186 	irq_set_chip_data(irq, d->host_data);
187 
188 	return 0;
189 }
190 
191 static const struct irq_domain_ops rt3883_pci_irq_domain_ops = {
192 	.map = rt3883_pci_irq_map,
193 	.xlate = irq_domain_xlate_onecell,
194 };
195 
rt3883_pci_irq_init(struct device * dev,struct rt3883_pci_controller * rpc)196 static int rt3883_pci_irq_init(struct device *dev,
197 			       struct rt3883_pci_controller *rpc)
198 {
199 	int irq;
200 
201 	irq = irq_of_parse_and_map(rpc->intc_of_node, 0);
202 	if (irq == 0) {
203 		dev_err(dev, "%pOF has no IRQ", rpc->intc_of_node);
204 		return -EINVAL;
205 	}
206 
207 	/* disable all interrupts */
208 	rt3883_pci_w32(rpc, 0, RT3883_PCI_REG_PCIENA);
209 
210 	rpc->irq_domain =
211 		irq_domain_add_linear(rpc->intc_of_node, RT3883_PCI_IRQ_COUNT,
212 				      &rt3883_pci_irq_domain_ops,
213 				      rpc);
214 	if (!rpc->irq_domain) {
215 		dev_err(dev, "unable to add IRQ domain\n");
216 		return -ENODEV;
217 	}
218 
219 	irq_set_chained_handler_and_data(irq, rt3883_pci_irq_handler, rpc);
220 
221 	return 0;
222 }
223 
rt3883_pci_config_read(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)224 static int rt3883_pci_config_read(struct pci_bus *bus, unsigned int devfn,
225 				  int where, int size, u32 *val)
226 {
227 	struct rt3883_pci_controller *rpc;
228 	u32 address;
229 	u32 data;
230 
231 	rpc = pci_bus_to_rt3883_controller(bus);
232 
233 	if (!rpc->pcie_ready && bus->number == 1)
234 		return PCIBIOS_DEVICE_NOT_FOUND;
235 
236 	address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
237 					 PCI_FUNC(devfn), where);
238 
239 	rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
240 	data = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA);
241 
242 	switch (size) {
243 	case 1:
244 		*val = (data >> ((where & 3) << 3)) & 0xff;
245 		break;
246 	case 2:
247 		*val = (data >> ((where & 3) << 3)) & 0xffff;
248 		break;
249 	case 4:
250 		*val = data;
251 		break;
252 	}
253 
254 	return PCIBIOS_SUCCESSFUL;
255 }
256 
rt3883_pci_config_write(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)257 static int rt3883_pci_config_write(struct pci_bus *bus, unsigned int devfn,
258 				   int where, int size, u32 val)
259 {
260 	struct rt3883_pci_controller *rpc;
261 	u32 address;
262 	u32 data;
263 
264 	rpc = pci_bus_to_rt3883_controller(bus);
265 
266 	if (!rpc->pcie_ready && bus->number == 1)
267 		return PCIBIOS_DEVICE_NOT_FOUND;
268 
269 	address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
270 					 PCI_FUNC(devfn), where);
271 
272 	rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR);
273 	data = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA);
274 
275 	switch (size) {
276 	case 1:
277 		data = (data & ~(0xff << ((where & 3) << 3))) |
278 		       (val << ((where & 3) << 3));
279 		break;
280 	case 2:
281 		data = (data & ~(0xffff << ((where & 3) << 3))) |
282 		       (val << ((where & 3) << 3));
283 		break;
284 	case 4:
285 		data = val;
286 		break;
287 	}
288 
289 	rt3883_pci_w32(rpc, data, RT3883_PCI_REG_CFGDATA);
290 
291 	return PCIBIOS_SUCCESSFUL;
292 }
293 
294 static struct pci_ops rt3883_pci_ops = {
295 	.read	= rt3883_pci_config_read,
296 	.write	= rt3883_pci_config_write,
297 };
298 
rt3883_pci_preinit(struct rt3883_pci_controller * rpc,unsigned mode)299 static void rt3883_pci_preinit(struct rt3883_pci_controller *rpc, unsigned mode)
300 {
301 	u32 syscfg1;
302 	u32 rstctrl;
303 	u32 clkcfg1;
304 	u32 t;
305 
306 	rstctrl = rt_sysc_r32(RT3883_SYSC_REG_RSTCTRL);
307 	syscfg1 = rt_sysc_r32(RT3883_SYSC_REG_SYSCFG1);
308 	clkcfg1 = rt_sysc_r32(RT3883_SYSC_REG_CLKCFG1);
309 
310 	if (mode & RT3883_PCI_MODE_PCIE) {
311 		rstctrl |= RT3883_RSTCTRL_PCIE;
312 		rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
313 
314 		/* setup PCI PAD drive mode */
315 		syscfg1 &= ~(0x30);
316 		syscfg1 |= (2 << 4);
317 		rt_sysc_w32(syscfg1, RT3883_SYSC_REG_SYSCFG1);
318 
319 		t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
320 		t &= ~BIT(31);
321 		rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
322 
323 		t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN1);
324 		t &= 0x80ffffff;
325 		rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN1);
326 
327 		t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN1);
328 		t |= 0xa << 24;
329 		rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN1);
330 
331 		t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
332 		t |= BIT(31);
333 		rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
334 
335 		msleep(50);
336 
337 		rstctrl &= ~RT3883_RSTCTRL_PCIE;
338 		rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
339 	}
340 
341 	syscfg1 |= (RT3883_SYSCFG1_PCIE_RC_MODE | RT3883_SYSCFG1_PCI_HOST_MODE);
342 
343 	clkcfg1 &= ~(RT3883_CLKCFG1_PCI_CLK_EN | RT3883_CLKCFG1_PCIE_CLK_EN);
344 
345 	if (mode & RT3883_PCI_MODE_PCI) {
346 		clkcfg1 |= RT3883_CLKCFG1_PCI_CLK_EN;
347 		rstctrl &= ~RT3883_RSTCTRL_PCI;
348 	}
349 
350 	if (mode & RT3883_PCI_MODE_PCIE) {
351 		clkcfg1 |= RT3883_CLKCFG1_PCIE_CLK_EN;
352 		rstctrl &= ~RT3883_RSTCTRL_PCIE;
353 	}
354 
355 	rt_sysc_w32(syscfg1, RT3883_SYSC_REG_SYSCFG1);
356 	rt_sysc_w32(rstctrl, RT3883_SYSC_REG_RSTCTRL);
357 	rt_sysc_w32(clkcfg1, RT3883_SYSC_REG_CLKCFG1);
358 
359 	msleep(500);
360 
361 	/*
362 	 * setup the device number of the P2P bridge
363 	 * and de-assert the reset line
364 	 */
365 	t = (RT3883_P2P_BR_DEVNUM << RT3883_PCICFG_P2P_BR_DEVNUM_S);
366 	rt3883_pci_w32(rpc, t, RT3883_PCI_REG_PCICFG);
367 
368 	/* flush write */
369 	rt3883_pci_r32(rpc, RT3883_PCI_REG_PCICFG);
370 	msleep(500);
371 
372 	if (mode & RT3883_PCI_MODE_PCIE) {
373 		msleep(500);
374 
375 		t = rt3883_pci_r32(rpc, RT3883_PCI_REG_STATUS(1));
376 
377 		rpc->pcie_ready = t & BIT(0);
378 
379 		if (!rpc->pcie_ready) {
380 			/* reset the PCIe block */
381 			t = rt_sysc_r32(RT3883_SYSC_REG_RSTCTRL);
382 			t |= RT3883_RSTCTRL_PCIE;
383 			rt_sysc_w32(t, RT3883_SYSC_REG_RSTCTRL);
384 			t &= ~RT3883_RSTCTRL_PCIE;
385 			rt_sysc_w32(t, RT3883_SYSC_REG_RSTCTRL);
386 
387 			/* turn off PCIe clock */
388 			t = rt_sysc_r32(RT3883_SYSC_REG_CLKCFG1);
389 			t &= ~RT3883_CLKCFG1_PCIE_CLK_EN;
390 			rt_sysc_w32(t, RT3883_SYSC_REG_CLKCFG1);
391 
392 			t = rt_sysc_r32(RT3883_SYSC_REG_PCIE_CLK_GEN0);
393 			t &= ~0xf000c080;
394 			rt_sysc_w32(t, RT3883_SYSC_REG_PCIE_CLK_GEN0);
395 		}
396 	}
397 
398 	/* enable PCI arbiter */
399 	rt3883_pci_w32(rpc, 0x79, RT3883_PCI_REG_ARBCTL);
400 }
401 
rt3883_pci_probe(struct platform_device * pdev)402 static int rt3883_pci_probe(struct platform_device *pdev)
403 {
404 	struct rt3883_pci_controller *rpc;
405 	struct device *dev = &pdev->dev;
406 	struct device_node *np = dev->of_node;
407 	struct device_node *child;
408 	u32 val;
409 	int err;
410 	int mode;
411 
412 	rpc = devm_kzalloc(dev, sizeof(*rpc), GFP_KERNEL);
413 	if (!rpc)
414 		return -ENOMEM;
415 
416 	rpc->base = devm_platform_ioremap_resource(pdev, 0);
417 	if (IS_ERR(rpc->base))
418 		return PTR_ERR(rpc->base);
419 
420 	/* find the interrupt controller child node */
421 	for_each_child_of_node(np, child) {
422 		if (of_property_read_bool(child, "interrupt-controller")) {
423 			rpc->intc_of_node = child;
424 			break;
425 		}
426 	}
427 
428 	if (!rpc->intc_of_node) {
429 		dev_err(dev, "%pOF has no %s child node",
430 			np, "interrupt controller");
431 		return -EINVAL;
432 	}
433 
434 	/* find the PCI host bridge child node */
435 	for_each_child_of_node(np, child) {
436 		if (of_node_is_type(child, "pci")) {
437 			rpc->pci_controller.of_node = child;
438 			break;
439 		}
440 	}
441 
442 	if (!rpc->pci_controller.of_node) {
443 		dev_err(dev, "%pOF has no %s child node",
444 			np, "PCI host bridge");
445 		err = -EINVAL;
446 		goto err_put_intc_node;
447 	}
448 
449 	mode = RT3883_PCI_MODE_NONE;
450 	for_each_available_child_of_node(rpc->pci_controller.of_node, child) {
451 		int devfn;
452 
453 		if (!of_node_is_type(child, "pci"))
454 			continue;
455 
456 		devfn = of_pci_get_devfn(child);
457 		if (devfn < 0)
458 			continue;
459 
460 		switch (PCI_SLOT(devfn)) {
461 		case 1:
462 			mode |= RT3883_PCI_MODE_PCIE;
463 			break;
464 
465 		case 17:
466 		case 18:
467 			mode |= RT3883_PCI_MODE_PCI;
468 			break;
469 		}
470 	}
471 
472 	if (mode == RT3883_PCI_MODE_NONE) {
473 		dev_err(dev, "unable to determine PCI mode\n");
474 		err = -EINVAL;
475 		goto err_put_hb_node;
476 	}
477 
478 	dev_info(dev, "mode:%s%s\n",
479 		 (mode & RT3883_PCI_MODE_PCI) ? " PCI" : "",
480 		 (mode & RT3883_PCI_MODE_PCIE) ? " PCIe" : "");
481 
482 	rt3883_pci_preinit(rpc, mode);
483 
484 	rpc->pci_controller.pci_ops = &rt3883_pci_ops;
485 	rpc->pci_controller.io_resource = &rpc->io_res;
486 	rpc->pci_controller.mem_resource = &rpc->mem_res;
487 
488 	/* Load PCI I/O and memory resources from DT */
489 	pci_load_of_ranges(&rpc->pci_controller,
490 			   rpc->pci_controller.of_node);
491 
492 	rt3883_pci_w32(rpc, rpc->mem_res.start, RT3883_PCI_REG_MEMBASE);
493 	rt3883_pci_w32(rpc, rpc->io_res.start, RT3883_PCI_REG_IOBASE);
494 
495 	ioport_resource.start = rpc->io_res.start;
496 	ioport_resource.end = rpc->io_res.end;
497 
498 	/* PCI */
499 	rt3883_pci_w32(rpc, 0x03ff0000, RT3883_PCI_REG_BAR0SETUP(0));
500 	rt3883_pci_w32(rpc, RT3883_MEMORY_BASE, RT3883_PCI_REG_IMBASEBAR0(0));
501 	rt3883_pci_w32(rpc, 0x08021814, RT3883_PCI_REG_ID(0));
502 	rt3883_pci_w32(rpc, 0x00800001, RT3883_PCI_REG_CLASS(0));
503 	rt3883_pci_w32(rpc, 0x28801814, RT3883_PCI_REG_SUBID(0));
504 
505 	/* PCIe */
506 	rt3883_pci_w32(rpc, 0x03ff0000, RT3883_PCI_REG_BAR0SETUP(1));
507 	rt3883_pci_w32(rpc, RT3883_MEMORY_BASE, RT3883_PCI_REG_IMBASEBAR0(1));
508 	rt3883_pci_w32(rpc, 0x08021814, RT3883_PCI_REG_ID(1));
509 	rt3883_pci_w32(rpc, 0x06040001, RT3883_PCI_REG_CLASS(1));
510 	rt3883_pci_w32(rpc, 0x28801814, RT3883_PCI_REG_SUBID(1));
511 
512 	err = rt3883_pci_irq_init(dev, rpc);
513 	if (err)
514 		goto err_put_hb_node;
515 
516 	/* PCIe */
517 	val = rt3883_pci_read_cfg32(rpc, 0, 0x01, 0, PCI_COMMAND);
518 	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
519 	rt3883_pci_write_cfg32(rpc, 0, 0x01, 0, PCI_COMMAND, val);
520 
521 	/* PCI */
522 	val = rt3883_pci_read_cfg32(rpc, 0, 0x00, 0, PCI_COMMAND);
523 	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
524 	rt3883_pci_write_cfg32(rpc, 0, 0x00, 0, PCI_COMMAND, val);
525 
526 	if (mode == RT3883_PCI_MODE_PCIE) {
527 		rt3883_pci_w32(rpc, 0x03ff0001, RT3883_PCI_REG_BAR0SETUP(0));
528 		rt3883_pci_w32(rpc, 0x03ff0001, RT3883_PCI_REG_BAR0SETUP(1));
529 
530 		rt3883_pci_write_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
531 				       PCI_BASE_ADDRESS_0,
532 				       RT3883_MEMORY_BASE);
533 		/* flush write */
534 		rt3883_pci_read_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
535 				      PCI_BASE_ADDRESS_0);
536 	} else {
537 		rt3883_pci_write_cfg32(rpc, 0, RT3883_P2P_BR_DEVNUM, 0,
538 				       PCI_IO_BASE, 0x00000101);
539 	}
540 
541 	register_pci_controller(&rpc->pci_controller);
542 
543 	return 0;
544 
545 err_put_hb_node:
546 	of_node_put(rpc->pci_controller.of_node);
547 err_put_intc_node:
548 	of_node_put(rpc->intc_of_node);
549 	return err;
550 }
551 
pcibios_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)552 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
553 {
554 	return of_irq_parse_and_map_pci(dev, slot, pin);
555 }
556 
pcibios_plat_dev_init(struct pci_dev * dev)557 int pcibios_plat_dev_init(struct pci_dev *dev)
558 {
559 	return 0;
560 }
561 
562 static const struct of_device_id rt3883_pci_ids[] = {
563 	{ .compatible = "ralink,rt3883-pci" },
564 	{},
565 };
566 
567 static struct platform_driver rt3883_pci_driver = {
568 	.probe = rt3883_pci_probe,
569 	.driver = {
570 		.name = "rt3883-pci",
571 		.of_match_table = of_match_ptr(rt3883_pci_ids),
572 	},
573 };
574 
rt3883_pci_init(void)575 static int __init rt3883_pci_init(void)
576 {
577 	return platform_driver_register(&rt3883_pci_driver);
578 }
579 
580 postcore_initcall(rt3883_pci_init);
581