1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * MediaTek PCIe host controller driver.
4  *
5  * Copyright (c) 2017 MediaTek Inc.
6  * Author: Ryder Lee <ryder.lee@mediatek.com>
7  *	   Honghui Zhang <honghui.zhang@mediatek.com>
8  */
9 
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/iopoll.h>
13 #include <linux/irq.h>
14 #include <linux/irqchip/chained_irq.h>
15 #include <linux/irqdomain.h>
16 #include <linux/kernel.h>
17 #include <linux/mfd/syscon.h>
18 #include <linux/msi.h>
19 #include <linux/module.h>
20 #include <linux/of_address.h>
21 #include <linux/of_pci.h>
22 #include <linux/of_platform.h>
23 #include <linux/pci.h>
24 #include <linux/phy/phy.h>
25 #include <linux/platform_device.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/regmap.h>
28 #include <linux/reset.h>
29 
30 #include "../pci.h"
31 
32 /* PCIe shared registers */
33 #define PCIE_SYS_CFG		0x00
34 #define PCIE_INT_ENABLE		0x0c
35 #define PCIE_CFG_ADDR		0x20
36 #define PCIE_CFG_DATA		0x24
37 
38 /* PCIe per port registers */
39 #define PCIE_BAR0_SETUP		0x10
40 #define PCIE_CLASS		0x34
41 #define PCIE_LINK_STATUS	0x50
42 
43 #define PCIE_PORT_INT_EN(x)	BIT(20 + (x))
44 #define PCIE_PORT_PERST(x)	BIT(1 + (x))
45 #define PCIE_PORT_LINKUP	BIT(0)
46 #define PCIE_BAR_MAP_MAX	GENMASK(31, 16)
47 
48 #define PCIE_BAR_ENABLE		BIT(0)
49 #define PCIE_REVISION_ID	BIT(0)
50 #define PCIE_CLASS_CODE		(0x60400 << 8)
51 #define PCIE_CONF_REG(regn)	(((regn) & GENMASK(7, 2)) | \
52 				((((regn) >> 8) & GENMASK(3, 0)) << 24))
53 #define PCIE_CONF_FUN(fun)	(((fun) << 8) & GENMASK(10, 8))
54 #define PCIE_CONF_DEV(dev)	(((dev) << 11) & GENMASK(15, 11))
55 #define PCIE_CONF_BUS(bus)	(((bus) << 16) & GENMASK(23, 16))
56 #define PCIE_CONF_ADDR(regn, fun, dev, bus) \
57 	(PCIE_CONF_REG(regn) | PCIE_CONF_FUN(fun) | \
58 	 PCIE_CONF_DEV(dev) | PCIE_CONF_BUS(bus))
59 
60 /* MediaTek specific configuration registers */
61 #define PCIE_FTS_NUM		0x70c
62 #define PCIE_FTS_NUM_MASK	GENMASK(15, 8)
63 #define PCIE_FTS_NUM_L0(x)	((x) & 0xff << 8)
64 
65 #define PCIE_FC_CREDIT		0x73c
66 #define PCIE_FC_CREDIT_MASK	(GENMASK(31, 31) | GENMASK(28, 16))
67 #define PCIE_FC_CREDIT_VAL(x)	((x) << 16)
68 
69 /* PCIe V2 share registers */
70 #define PCIE_SYS_CFG_V2		0x0
71 #define PCIE_CSR_LTSSM_EN(x)	BIT(0 + (x) * 8)
72 #define PCIE_CSR_ASPM_L1_EN(x)	BIT(1 + (x) * 8)
73 
74 /* PCIe V2 per-port registers */
75 #define PCIE_MSI_VECTOR		0x0c0
76 
77 #define PCIE_CONF_VEND_ID	0x100
78 #define PCIE_CONF_DEVICE_ID	0x102
79 #define PCIE_CONF_CLASS_ID	0x106
80 
81 #define PCIE_INT_MASK		0x420
82 #define INTX_MASK		GENMASK(19, 16)
83 #define INTX_SHIFT		16
84 #define PCIE_INT_STATUS		0x424
85 #define MSI_STATUS		BIT(23)
86 #define PCIE_IMSI_STATUS	0x42c
87 #define PCIE_IMSI_ADDR		0x430
88 #define MSI_MASK		BIT(23)
89 #define MTK_MSI_IRQS_NUM	32
90 
91 #define PCIE_AHB_TRANS_BASE0_L	0x438
92 #define PCIE_AHB_TRANS_BASE0_H	0x43c
93 #define AHB2PCIE_SIZE(x)	((x) & GENMASK(4, 0))
94 #define PCIE_AXI_WINDOW0	0x448
95 #define WIN_ENABLE		BIT(7)
96 /*
97  * Define PCIe to AHB window size as 2^33 to support max 8GB address space
98  * translate, support least 4GB DRAM size access from EP DMA(physical DRAM
99  * start from 0x40000000).
100  */
101 #define PCIE2AHB_SIZE	0x21
102 
103 /* PCIe V2 configuration transaction header */
104 #define PCIE_CFG_HEADER0	0x460
105 #define PCIE_CFG_HEADER1	0x464
106 #define PCIE_CFG_HEADER2	0x468
107 #define PCIE_CFG_WDATA		0x470
108 #define PCIE_APP_TLP_REQ	0x488
109 #define PCIE_CFG_RDATA		0x48c
110 #define APP_CFG_REQ		BIT(0)
111 #define APP_CPL_STATUS		GENMASK(7, 5)
112 
113 #define CFG_WRRD_TYPE_0		4
114 #define CFG_WR_FMT		2
115 #define CFG_RD_FMT		0
116 
117 #define CFG_DW0_LENGTH(length)	((length) & GENMASK(9, 0))
118 #define CFG_DW0_TYPE(type)	(((type) << 24) & GENMASK(28, 24))
119 #define CFG_DW0_FMT(fmt)	(((fmt) << 29) & GENMASK(31, 29))
120 #define CFG_DW2_REGN(regn)	((regn) & GENMASK(11, 2))
121 #define CFG_DW2_FUN(fun)	(((fun) << 16) & GENMASK(18, 16))
122 #define CFG_DW2_DEV(dev)	(((dev) << 19) & GENMASK(23, 19))
123 #define CFG_DW2_BUS(bus)	(((bus) << 24) & GENMASK(31, 24))
124 #define CFG_HEADER_DW0(type, fmt) \
125 	(CFG_DW0_LENGTH(1) | CFG_DW0_TYPE(type) | CFG_DW0_FMT(fmt))
126 #define CFG_HEADER_DW1(where, size) \
127 	(GENMASK(((size) - 1), 0) << ((where) & 0x3))
128 #define CFG_HEADER_DW2(regn, fun, dev, bus) \
129 	(CFG_DW2_REGN(regn) | CFG_DW2_FUN(fun) | \
130 	CFG_DW2_DEV(dev) | CFG_DW2_BUS(bus))
131 
132 #define PCIE_RST_CTRL		0x510
133 #define PCIE_PHY_RSTB		BIT(0)
134 #define PCIE_PIPE_SRSTB		BIT(1)
135 #define PCIE_MAC_SRSTB		BIT(2)
136 #define PCIE_CRSTB		BIT(3)
137 #define PCIE_PERSTB		BIT(8)
138 #define PCIE_LINKDOWN_RST_EN	GENMASK(15, 13)
139 #define PCIE_LINK_STATUS_V2	0x804
140 #define PCIE_PORT_LINKUP_V2	BIT(10)
141 
142 struct mtk_pcie_port;
143 
144 /**
145  * struct mtk_pcie_soc - differentiate between host generations
146  * @need_fix_class_id: whether this host's class ID needed to be fixed or not
147  * @need_fix_device_id: whether this host's device ID needed to be fixed or not
148  * @no_msi: Bridge has no MSI support, and relies on an external block
149  * @device_id: device ID which this host need to be fixed
150  * @ops: pointer to configuration access functions
151  * @startup: pointer to controller setting functions
152  * @setup_irq: pointer to initialize IRQ functions
153  */
154 struct mtk_pcie_soc {
155 	bool need_fix_class_id;
156 	bool need_fix_device_id;
157 	bool no_msi;
158 	unsigned int device_id;
159 	struct pci_ops *ops;
160 	int (*startup)(struct mtk_pcie_port *port);
161 	int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node);
162 };
163 
164 /**
165  * struct mtk_pcie_port - PCIe port information
166  * @base: IO mapped register base
167  * @list: port list
168  * @pcie: pointer to PCIe host info
169  * @reset: pointer to port reset control
170  * @sys_ck: pointer to transaction/data link layer clock
171  * @ahb_ck: pointer to AHB slave interface operating clock for CSR access
172  *          and RC initiated MMIO access
173  * @axi_ck: pointer to application layer MMIO channel operating clock
174  * @aux_ck: pointer to pe2_mac_bridge and pe2_mac_core operating clock
175  *          when pcie_mac_ck/pcie_pipe_ck is turned off
176  * @obff_ck: pointer to OBFF functional block operating clock
177  * @pipe_ck: pointer to LTSSM and PHY/MAC layer operating clock
178  * @phy: pointer to PHY control block
179  * @slot: port slot
180  * @irq: GIC irq
181  * @irq_domain: legacy INTx IRQ domain
182  * @inner_domain: inner IRQ domain
183  * @msi_domain: MSI IRQ domain
184  * @lock: protect the msi_irq_in_use bitmap
185  * @msi_irq_in_use: bit map for assigned MSI IRQ
186  */
187 struct mtk_pcie_port {
188 	void __iomem *base;
189 	struct list_head list;
190 	struct mtk_pcie *pcie;
191 	struct reset_control *reset;
192 	struct clk *sys_ck;
193 	struct clk *ahb_ck;
194 	struct clk *axi_ck;
195 	struct clk *aux_ck;
196 	struct clk *obff_ck;
197 	struct clk *pipe_ck;
198 	struct phy *phy;
199 	u32 slot;
200 	int irq;
201 	struct irq_domain *irq_domain;
202 	struct irq_domain *inner_domain;
203 	struct irq_domain *msi_domain;
204 	struct mutex lock;
205 	DECLARE_BITMAP(msi_irq_in_use, MTK_MSI_IRQS_NUM);
206 };
207 
208 /**
209  * struct mtk_pcie - PCIe host information
210  * @dev: pointer to PCIe device
211  * @base: IO mapped register base
212  * @cfg: IO mapped register map for PCIe config
213  * @free_ck: free-run reference clock
214  * @mem: non-prefetchable memory resource
215  * @ports: pointer to PCIe port information
216  * @soc: pointer to SoC-dependent operations
217  */
218 struct mtk_pcie {
219 	struct device *dev;
220 	void __iomem *base;
221 	struct regmap *cfg;
222 	struct clk *free_ck;
223 
224 	struct list_head ports;
225 	const struct mtk_pcie_soc *soc;
226 };
227 
228 static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie)
229 {
230 	struct device *dev = pcie->dev;
231 
232 	clk_disable_unprepare(pcie->free_ck);
233 
234 	pm_runtime_put_sync(dev);
235 	pm_runtime_disable(dev);
236 }
237 
238 static void mtk_pcie_port_free(struct mtk_pcie_port *port)
239 {
240 	struct mtk_pcie *pcie = port->pcie;
241 	struct device *dev = pcie->dev;
242 
243 	devm_iounmap(dev, port->base);
244 	list_del(&port->list);
245 	devm_kfree(dev, port);
246 }
247 
248 static void mtk_pcie_put_resources(struct mtk_pcie *pcie)
249 {
250 	struct mtk_pcie_port *port, *tmp;
251 
252 	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
253 		phy_power_off(port->phy);
254 		phy_exit(port->phy);
255 		clk_disable_unprepare(port->pipe_ck);
256 		clk_disable_unprepare(port->obff_ck);
257 		clk_disable_unprepare(port->axi_ck);
258 		clk_disable_unprepare(port->aux_ck);
259 		clk_disable_unprepare(port->ahb_ck);
260 		clk_disable_unprepare(port->sys_ck);
261 		mtk_pcie_port_free(port);
262 	}
263 
264 	mtk_pcie_subsys_powerdown(pcie);
265 }
266 
267 static int mtk_pcie_check_cfg_cpld(struct mtk_pcie_port *port)
268 {
269 	u32 val;
270 	int err;
271 
272 	err = readl_poll_timeout_atomic(port->base + PCIE_APP_TLP_REQ, val,
273 					!(val & APP_CFG_REQ), 10,
274 					100 * USEC_PER_MSEC);
275 	if (err)
276 		return PCIBIOS_SET_FAILED;
277 
278 	if (readl(port->base + PCIE_APP_TLP_REQ) & APP_CPL_STATUS)
279 		return PCIBIOS_SET_FAILED;
280 
281 	return PCIBIOS_SUCCESSFUL;
282 }
283 
284 static int mtk_pcie_hw_rd_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
285 			      int where, int size, u32 *val)
286 {
287 	u32 tmp;
288 
289 	/* Write PCIe configuration transaction header for Cfgrd */
290 	writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_RD_FMT),
291 	       port->base + PCIE_CFG_HEADER0);
292 	writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
293 	writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_SLOT(devfn), bus),
294 	       port->base + PCIE_CFG_HEADER2);
295 
296 	/* Trigger h/w to transmit Cfgrd TLP */
297 	tmp = readl(port->base + PCIE_APP_TLP_REQ);
298 	tmp |= APP_CFG_REQ;
299 	writel(tmp, port->base + PCIE_APP_TLP_REQ);
300 
301 	/* Check completion status */
302 	if (mtk_pcie_check_cfg_cpld(port))
303 		return PCIBIOS_SET_FAILED;
304 
305 	/* Read cpld payload of Cfgrd */
306 	*val = readl(port->base + PCIE_CFG_RDATA);
307 
308 	if (size == 1)
309 		*val = (*val >> (8 * (where & 3))) & 0xff;
310 	else if (size == 2)
311 		*val = (*val >> (8 * (where & 3))) & 0xffff;
312 
313 	return PCIBIOS_SUCCESSFUL;
314 }
315 
316 static int mtk_pcie_hw_wr_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
317 			      int where, int size, u32 val)
318 {
319 	/* Write PCIe configuration transaction header for Cfgwr */
320 	writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_WR_FMT),
321 	       port->base + PCIE_CFG_HEADER0);
322 	writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
323 	writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_SLOT(devfn), bus),
324 	       port->base + PCIE_CFG_HEADER2);
325 
326 	/* Write Cfgwr data */
327 	val = val << 8 * (where & 3);
328 	writel(val, port->base + PCIE_CFG_WDATA);
329 
330 	/* Trigger h/w to transmit Cfgwr TLP */
331 	val = readl(port->base + PCIE_APP_TLP_REQ);
332 	val |= APP_CFG_REQ;
333 	writel(val, port->base + PCIE_APP_TLP_REQ);
334 
335 	/* Check completion status */
336 	return mtk_pcie_check_cfg_cpld(port);
337 }
338 
339 static struct mtk_pcie_port *mtk_pcie_find_port(struct pci_bus *bus,
340 						unsigned int devfn)
341 {
342 	struct mtk_pcie *pcie = bus->sysdata;
343 	struct mtk_pcie_port *port;
344 	struct pci_dev *dev = NULL;
345 
346 	/*
347 	 * Walk the bus hierarchy to get the devfn value
348 	 * of the port in the root bus.
349 	 */
350 	while (bus && bus->number) {
351 		dev = bus->self;
352 		bus = dev->bus;
353 		devfn = dev->devfn;
354 	}
355 
356 	list_for_each_entry(port, &pcie->ports, list)
357 		if (port->slot == PCI_SLOT(devfn))
358 			return port;
359 
360 	return NULL;
361 }
362 
363 static int mtk_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
364 				int where, int size, u32 *val)
365 {
366 	struct mtk_pcie_port *port;
367 	u32 bn = bus->number;
368 
369 	port = mtk_pcie_find_port(bus, devfn);
370 	if (!port)
371 		return PCIBIOS_DEVICE_NOT_FOUND;
372 
373 	return mtk_pcie_hw_rd_cfg(port, bn, devfn, where, size, val);
374 }
375 
376 static int mtk_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
377 				 int where, int size, u32 val)
378 {
379 	struct mtk_pcie_port *port;
380 	u32 bn = bus->number;
381 
382 	port = mtk_pcie_find_port(bus, devfn);
383 	if (!port)
384 		return PCIBIOS_DEVICE_NOT_FOUND;
385 
386 	return mtk_pcie_hw_wr_cfg(port, bn, devfn, where, size, val);
387 }
388 
389 static struct pci_ops mtk_pcie_ops_v2 = {
390 	.read  = mtk_pcie_config_read,
391 	.write = mtk_pcie_config_write,
392 };
393 
394 static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
395 {
396 	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
397 	phys_addr_t addr;
398 
399 	/* MT2712/MT7622 only support 32-bit MSI addresses */
400 	addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
401 	msg->address_hi = 0;
402 	msg->address_lo = lower_32_bits(addr);
403 
404 	msg->data = data->hwirq;
405 
406 	dev_dbg(port->pcie->dev, "msi#%d address_hi %#x address_lo %#x\n",
407 		(int)data->hwirq, msg->address_hi, msg->address_lo);
408 }
409 
410 static int mtk_msi_set_affinity(struct irq_data *irq_data,
411 				const struct cpumask *mask, bool force)
412 {
413 	 return -EINVAL;
414 }
415 
416 static void mtk_msi_ack_irq(struct irq_data *data)
417 {
418 	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
419 	u32 hwirq = data->hwirq;
420 
421 	writel(1 << hwirq, port->base + PCIE_IMSI_STATUS);
422 }
423 
424 static struct irq_chip mtk_msi_bottom_irq_chip = {
425 	.name			= "MTK MSI",
426 	.irq_compose_msi_msg	= mtk_compose_msi_msg,
427 	.irq_set_affinity	= mtk_msi_set_affinity,
428 	.irq_ack		= mtk_msi_ack_irq,
429 };
430 
431 static int mtk_pcie_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
432 				     unsigned int nr_irqs, void *args)
433 {
434 	struct mtk_pcie_port *port = domain->host_data;
435 	unsigned long bit;
436 
437 	WARN_ON(nr_irqs != 1);
438 	mutex_lock(&port->lock);
439 
440 	bit = find_first_zero_bit(port->msi_irq_in_use, MTK_MSI_IRQS_NUM);
441 	if (bit >= MTK_MSI_IRQS_NUM) {
442 		mutex_unlock(&port->lock);
443 		return -ENOSPC;
444 	}
445 
446 	__set_bit(bit, port->msi_irq_in_use);
447 
448 	mutex_unlock(&port->lock);
449 
450 	irq_domain_set_info(domain, virq, bit, &mtk_msi_bottom_irq_chip,
451 			    domain->host_data, handle_edge_irq,
452 			    NULL, NULL);
453 
454 	return 0;
455 }
456 
457 static void mtk_pcie_irq_domain_free(struct irq_domain *domain,
458 				     unsigned int virq, unsigned int nr_irqs)
459 {
460 	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
461 	struct mtk_pcie_port *port = irq_data_get_irq_chip_data(d);
462 
463 	mutex_lock(&port->lock);
464 
465 	if (!test_bit(d->hwirq, port->msi_irq_in_use))
466 		dev_err(port->pcie->dev, "trying to free unused MSI#%lu\n",
467 			d->hwirq);
468 	else
469 		__clear_bit(d->hwirq, port->msi_irq_in_use);
470 
471 	mutex_unlock(&port->lock);
472 
473 	irq_domain_free_irqs_parent(domain, virq, nr_irqs);
474 }
475 
476 static const struct irq_domain_ops msi_domain_ops = {
477 	.alloc	= mtk_pcie_irq_domain_alloc,
478 	.free	= mtk_pcie_irq_domain_free,
479 };
480 
481 static struct irq_chip mtk_msi_irq_chip = {
482 	.name		= "MTK PCIe MSI",
483 	.irq_ack	= irq_chip_ack_parent,
484 	.irq_mask	= pci_msi_mask_irq,
485 	.irq_unmask	= pci_msi_unmask_irq,
486 };
487 
488 static struct msi_domain_info mtk_msi_domain_info = {
489 	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
490 		   MSI_FLAG_PCI_MSIX),
491 	.chip	= &mtk_msi_irq_chip,
492 };
493 
494 static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
495 {
496 	struct fwnode_handle *fwnode = of_node_to_fwnode(port->pcie->dev->of_node);
497 
498 	mutex_init(&port->lock);
499 
500 	port->inner_domain = irq_domain_create_linear(fwnode, MTK_MSI_IRQS_NUM,
501 						      &msi_domain_ops, port);
502 	if (!port->inner_domain) {
503 		dev_err(port->pcie->dev, "failed to create IRQ domain\n");
504 		return -ENOMEM;
505 	}
506 
507 	port->msi_domain = pci_msi_create_irq_domain(fwnode, &mtk_msi_domain_info,
508 						     port->inner_domain);
509 	if (!port->msi_domain) {
510 		dev_err(port->pcie->dev, "failed to create MSI domain\n");
511 		irq_domain_remove(port->inner_domain);
512 		return -ENOMEM;
513 	}
514 
515 	return 0;
516 }
517 
518 static void mtk_pcie_enable_msi(struct mtk_pcie_port *port)
519 {
520 	u32 val;
521 	phys_addr_t msg_addr;
522 
523 	msg_addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
524 	val = lower_32_bits(msg_addr);
525 	writel(val, port->base + PCIE_IMSI_ADDR);
526 
527 	val = readl(port->base + PCIE_INT_MASK);
528 	val &= ~MSI_MASK;
529 	writel(val, port->base + PCIE_INT_MASK);
530 }
531 
532 static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
533 {
534 	struct mtk_pcie_port *port, *tmp;
535 
536 	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
537 		irq_set_chained_handler_and_data(port->irq, NULL, NULL);
538 
539 		if (port->irq_domain)
540 			irq_domain_remove(port->irq_domain);
541 
542 		if (IS_ENABLED(CONFIG_PCI_MSI)) {
543 			if (port->msi_domain)
544 				irq_domain_remove(port->msi_domain);
545 			if (port->inner_domain)
546 				irq_domain_remove(port->inner_domain);
547 		}
548 
549 		irq_dispose_mapping(port->irq);
550 	}
551 }
552 
553 static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
554 			     irq_hw_number_t hwirq)
555 {
556 	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
557 	irq_set_chip_data(irq, domain->host_data);
558 
559 	return 0;
560 }
561 
562 static const struct irq_domain_ops intx_domain_ops = {
563 	.map = mtk_pcie_intx_map,
564 };
565 
566 static int mtk_pcie_init_irq_domain(struct mtk_pcie_port *port,
567 				    struct device_node *node)
568 {
569 	struct device *dev = port->pcie->dev;
570 	struct device_node *pcie_intc_node;
571 	int ret;
572 
573 	/* Setup INTx */
574 	pcie_intc_node = of_get_next_child(node, NULL);
575 	if (!pcie_intc_node) {
576 		dev_err(dev, "no PCIe Intc node found\n");
577 		return -ENODEV;
578 	}
579 
580 	port->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
581 						 &intx_domain_ops, port);
582 	of_node_put(pcie_intc_node);
583 	if (!port->irq_domain) {
584 		dev_err(dev, "failed to get INTx IRQ domain\n");
585 		return -ENODEV;
586 	}
587 
588 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
589 		ret = mtk_pcie_allocate_msi_domains(port);
590 		if (ret)
591 			return ret;
592 	}
593 
594 	return 0;
595 }
596 
597 static void mtk_pcie_intr_handler(struct irq_desc *desc)
598 {
599 	struct mtk_pcie_port *port = irq_desc_get_handler_data(desc);
600 	struct irq_chip *irqchip = irq_desc_get_chip(desc);
601 	unsigned long status;
602 	u32 bit = INTX_SHIFT;
603 
604 	chained_irq_enter(irqchip, desc);
605 
606 	status = readl(port->base + PCIE_INT_STATUS);
607 	if (status & INTX_MASK) {
608 		for_each_set_bit_from(bit, &status, PCI_NUM_INTX + INTX_SHIFT) {
609 			/* Clear the INTx */
610 			writel(1 << bit, port->base + PCIE_INT_STATUS);
611 			generic_handle_domain_irq(port->irq_domain,
612 						  bit - INTX_SHIFT);
613 		}
614 	}
615 
616 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
617 		if (status & MSI_STATUS){
618 			unsigned long imsi_status;
619 
620 			while ((imsi_status = readl(port->base + PCIE_IMSI_STATUS))) {
621 				for_each_set_bit(bit, &imsi_status, MTK_MSI_IRQS_NUM)
622 					generic_handle_domain_irq(port->inner_domain, bit);
623 			}
624 			/* Clear MSI interrupt status */
625 			writel(MSI_STATUS, port->base + PCIE_INT_STATUS);
626 		}
627 	}
628 
629 	chained_irq_exit(irqchip, desc);
630 }
631 
632 static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
633 			      struct device_node *node)
634 {
635 	struct mtk_pcie *pcie = port->pcie;
636 	struct device *dev = pcie->dev;
637 	struct platform_device *pdev = to_platform_device(dev);
638 	int err;
639 
640 	err = mtk_pcie_init_irq_domain(port, node);
641 	if (err) {
642 		dev_err(dev, "failed to init PCIe IRQ domain\n");
643 		return err;
644 	}
645 
646 	if (of_property_present(dev->of_node, "interrupt-names"))
647 		port->irq = platform_get_irq_byname(pdev, "pcie_irq");
648 	else
649 		port->irq = platform_get_irq(pdev, port->slot);
650 
651 	if (port->irq < 0)
652 		return port->irq;
653 
654 	irq_set_chained_handler_and_data(port->irq,
655 					 mtk_pcie_intr_handler, port);
656 
657 	return 0;
658 }
659 
660 static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
661 {
662 	struct mtk_pcie *pcie = port->pcie;
663 	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
664 	struct resource *mem = NULL;
665 	struct resource_entry *entry;
666 	const struct mtk_pcie_soc *soc = port->pcie->soc;
667 	u32 val;
668 	int err;
669 
670 	entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
671 	if (entry)
672 		mem = entry->res;
673 	if (!mem)
674 		return -EINVAL;
675 
676 	/* MT7622 platforms need to enable LTSSM and ASPM from PCIe subsys */
677 	if (pcie->base) {
678 		val = readl(pcie->base + PCIE_SYS_CFG_V2);
679 		val |= PCIE_CSR_LTSSM_EN(port->slot) |
680 		       PCIE_CSR_ASPM_L1_EN(port->slot);
681 		writel(val, pcie->base + PCIE_SYS_CFG_V2);
682 	} else if (pcie->cfg) {
683 		val = PCIE_CSR_LTSSM_EN(port->slot) |
684 		      PCIE_CSR_ASPM_L1_EN(port->slot);
685 		regmap_update_bits(pcie->cfg, PCIE_SYS_CFG_V2, val, val);
686 	}
687 
688 	/* Assert all reset signals */
689 	writel(0, port->base + PCIE_RST_CTRL);
690 
691 	/*
692 	 * Enable PCIe link down reset, if link status changed from link up to
693 	 * link down, this will reset MAC control registers and configuration
694 	 * space.
695 	 */
696 	writel(PCIE_LINKDOWN_RST_EN, port->base + PCIE_RST_CTRL);
697 
698 	/*
699 	 * Described in PCIe CEM specification sections 2.2 (PERST# Signal) and
700 	 * 2.2.1 (Initial Power-Up (G3 to S0)). The deassertion of PERST# should
701 	 * be delayed 100ms (TPVPERL) for the power and clock to become stable.
702 	 */
703 	msleep(100);
704 
705 	/* De-assert PHY, PE, PIPE, MAC and configuration reset	*/
706 	val = readl(port->base + PCIE_RST_CTRL);
707 	val |= PCIE_PHY_RSTB | PCIE_PERSTB | PCIE_PIPE_SRSTB |
708 	       PCIE_MAC_SRSTB | PCIE_CRSTB;
709 	writel(val, port->base + PCIE_RST_CTRL);
710 
711 	/* Set up vendor ID and class code */
712 	if (soc->need_fix_class_id) {
713 		val = PCI_VENDOR_ID_MEDIATEK;
714 		writew(val, port->base + PCIE_CONF_VEND_ID);
715 
716 		val = PCI_CLASS_BRIDGE_PCI;
717 		writew(val, port->base + PCIE_CONF_CLASS_ID);
718 	}
719 
720 	if (soc->need_fix_device_id)
721 		writew(soc->device_id, port->base + PCIE_CONF_DEVICE_ID);
722 
723 	/* 100ms timeout value should be enough for Gen1/2 training */
724 	err = readl_poll_timeout(port->base + PCIE_LINK_STATUS_V2, val,
725 				 !!(val & PCIE_PORT_LINKUP_V2), 20,
726 				 100 * USEC_PER_MSEC);
727 	if (err)
728 		return -ETIMEDOUT;
729 
730 	/* Set INTx mask */
731 	val = readl(port->base + PCIE_INT_MASK);
732 	val &= ~INTX_MASK;
733 	writel(val, port->base + PCIE_INT_MASK);
734 
735 	if (IS_ENABLED(CONFIG_PCI_MSI))
736 		mtk_pcie_enable_msi(port);
737 
738 	/* Set AHB to PCIe translation windows */
739 	val = lower_32_bits(mem->start) |
740 	      AHB2PCIE_SIZE(fls(resource_size(mem)));
741 	writel(val, port->base + PCIE_AHB_TRANS_BASE0_L);
742 
743 	val = upper_32_bits(mem->start);
744 	writel(val, port->base + PCIE_AHB_TRANS_BASE0_H);
745 
746 	/* Set PCIe to AXI translation memory space.*/
747 	val = PCIE2AHB_SIZE | WIN_ENABLE;
748 	writel(val, port->base + PCIE_AXI_WINDOW0);
749 
750 	return 0;
751 }
752 
753 static void __iomem *mtk_pcie_map_bus(struct pci_bus *bus,
754 				      unsigned int devfn, int where)
755 {
756 	struct mtk_pcie *pcie = bus->sysdata;
757 
758 	writel(PCIE_CONF_ADDR(where, PCI_FUNC(devfn), PCI_SLOT(devfn),
759 			      bus->number), pcie->base + PCIE_CFG_ADDR);
760 
761 	return pcie->base + PCIE_CFG_DATA + (where & 3);
762 }
763 
764 static struct pci_ops mtk_pcie_ops = {
765 	.map_bus = mtk_pcie_map_bus,
766 	.read  = pci_generic_config_read,
767 	.write = pci_generic_config_write,
768 };
769 
770 static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
771 {
772 	struct mtk_pcie *pcie = port->pcie;
773 	u32 func = PCI_FUNC(port->slot);
774 	u32 slot = PCI_SLOT(port->slot << 3);
775 	u32 val;
776 	int err;
777 
778 	/* assert port PERST_N */
779 	val = readl(pcie->base + PCIE_SYS_CFG);
780 	val |= PCIE_PORT_PERST(port->slot);
781 	writel(val, pcie->base + PCIE_SYS_CFG);
782 
783 	/* de-assert port PERST_N */
784 	val = readl(pcie->base + PCIE_SYS_CFG);
785 	val &= ~PCIE_PORT_PERST(port->slot);
786 	writel(val, pcie->base + PCIE_SYS_CFG);
787 
788 	/* 100ms timeout value should be enough for Gen1/2 training */
789 	err = readl_poll_timeout(port->base + PCIE_LINK_STATUS, val,
790 				 !!(val & PCIE_PORT_LINKUP), 20,
791 				 100 * USEC_PER_MSEC);
792 	if (err)
793 		return -ETIMEDOUT;
794 
795 	/* enable interrupt */
796 	val = readl(pcie->base + PCIE_INT_ENABLE);
797 	val |= PCIE_PORT_INT_EN(port->slot);
798 	writel(val, pcie->base + PCIE_INT_ENABLE);
799 
800 	/* map to all DDR region. We need to set it before cfg operation. */
801 	writel(PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
802 	       port->base + PCIE_BAR0_SETUP);
803 
804 	/* configure class code and revision ID */
805 	writel(PCIE_CLASS_CODE | PCIE_REVISION_ID, port->base + PCIE_CLASS);
806 
807 	/* configure FC credit */
808 	writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
809 	       pcie->base + PCIE_CFG_ADDR);
810 	val = readl(pcie->base + PCIE_CFG_DATA);
811 	val &= ~PCIE_FC_CREDIT_MASK;
812 	val |= PCIE_FC_CREDIT_VAL(0x806c);
813 	writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
814 	       pcie->base + PCIE_CFG_ADDR);
815 	writel(val, pcie->base + PCIE_CFG_DATA);
816 
817 	/* configure RC FTS number to 250 when it leaves L0s */
818 	writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
819 	       pcie->base + PCIE_CFG_ADDR);
820 	val = readl(pcie->base + PCIE_CFG_DATA);
821 	val &= ~PCIE_FTS_NUM_MASK;
822 	val |= PCIE_FTS_NUM_L0(0x50);
823 	writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
824 	       pcie->base + PCIE_CFG_ADDR);
825 	writel(val, pcie->base + PCIE_CFG_DATA);
826 
827 	return 0;
828 }
829 
830 static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
831 {
832 	struct mtk_pcie *pcie = port->pcie;
833 	struct device *dev = pcie->dev;
834 	int err;
835 
836 	err = clk_prepare_enable(port->sys_ck);
837 	if (err) {
838 		dev_err(dev, "failed to enable sys_ck%d clock\n", port->slot);
839 		goto err_sys_clk;
840 	}
841 
842 	err = clk_prepare_enable(port->ahb_ck);
843 	if (err) {
844 		dev_err(dev, "failed to enable ahb_ck%d\n", port->slot);
845 		goto err_ahb_clk;
846 	}
847 
848 	err = clk_prepare_enable(port->aux_ck);
849 	if (err) {
850 		dev_err(dev, "failed to enable aux_ck%d\n", port->slot);
851 		goto err_aux_clk;
852 	}
853 
854 	err = clk_prepare_enable(port->axi_ck);
855 	if (err) {
856 		dev_err(dev, "failed to enable axi_ck%d\n", port->slot);
857 		goto err_axi_clk;
858 	}
859 
860 	err = clk_prepare_enable(port->obff_ck);
861 	if (err) {
862 		dev_err(dev, "failed to enable obff_ck%d\n", port->slot);
863 		goto err_obff_clk;
864 	}
865 
866 	err = clk_prepare_enable(port->pipe_ck);
867 	if (err) {
868 		dev_err(dev, "failed to enable pipe_ck%d\n", port->slot);
869 		goto err_pipe_clk;
870 	}
871 
872 	reset_control_assert(port->reset);
873 	reset_control_deassert(port->reset);
874 
875 	err = phy_init(port->phy);
876 	if (err) {
877 		dev_err(dev, "failed to initialize port%d phy\n", port->slot);
878 		goto err_phy_init;
879 	}
880 
881 	err = phy_power_on(port->phy);
882 	if (err) {
883 		dev_err(dev, "failed to power on port%d phy\n", port->slot);
884 		goto err_phy_on;
885 	}
886 
887 	if (!pcie->soc->startup(port))
888 		return;
889 
890 	dev_info(dev, "Port%d link down\n", port->slot);
891 
892 	phy_power_off(port->phy);
893 err_phy_on:
894 	phy_exit(port->phy);
895 err_phy_init:
896 	clk_disable_unprepare(port->pipe_ck);
897 err_pipe_clk:
898 	clk_disable_unprepare(port->obff_ck);
899 err_obff_clk:
900 	clk_disable_unprepare(port->axi_ck);
901 err_axi_clk:
902 	clk_disable_unprepare(port->aux_ck);
903 err_aux_clk:
904 	clk_disable_unprepare(port->ahb_ck);
905 err_ahb_clk:
906 	clk_disable_unprepare(port->sys_ck);
907 err_sys_clk:
908 	mtk_pcie_port_free(port);
909 }
910 
911 static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
912 			       struct device_node *node,
913 			       int slot)
914 {
915 	struct mtk_pcie_port *port;
916 	struct device *dev = pcie->dev;
917 	struct platform_device *pdev = to_platform_device(dev);
918 	char name[10];
919 	int err;
920 
921 	port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
922 	if (!port)
923 		return -ENOMEM;
924 
925 	snprintf(name, sizeof(name), "port%d", slot);
926 	port->base = devm_platform_ioremap_resource_byname(pdev, name);
927 	if (IS_ERR(port->base)) {
928 		dev_err(dev, "failed to map port%d base\n", slot);
929 		return PTR_ERR(port->base);
930 	}
931 
932 	snprintf(name, sizeof(name), "sys_ck%d", slot);
933 	port->sys_ck = devm_clk_get(dev, name);
934 	if (IS_ERR(port->sys_ck)) {
935 		dev_err(dev, "failed to get sys_ck%d clock\n", slot);
936 		return PTR_ERR(port->sys_ck);
937 	}
938 
939 	/* sys_ck might be divided into the following parts in some chips */
940 	snprintf(name, sizeof(name), "ahb_ck%d", slot);
941 	port->ahb_ck = devm_clk_get_optional(dev, name);
942 	if (IS_ERR(port->ahb_ck))
943 		return PTR_ERR(port->ahb_ck);
944 
945 	snprintf(name, sizeof(name), "axi_ck%d", slot);
946 	port->axi_ck = devm_clk_get_optional(dev, name);
947 	if (IS_ERR(port->axi_ck))
948 		return PTR_ERR(port->axi_ck);
949 
950 	snprintf(name, sizeof(name), "aux_ck%d", slot);
951 	port->aux_ck = devm_clk_get_optional(dev, name);
952 	if (IS_ERR(port->aux_ck))
953 		return PTR_ERR(port->aux_ck);
954 
955 	snprintf(name, sizeof(name), "obff_ck%d", slot);
956 	port->obff_ck = devm_clk_get_optional(dev, name);
957 	if (IS_ERR(port->obff_ck))
958 		return PTR_ERR(port->obff_ck);
959 
960 	snprintf(name, sizeof(name), "pipe_ck%d", slot);
961 	port->pipe_ck = devm_clk_get_optional(dev, name);
962 	if (IS_ERR(port->pipe_ck))
963 		return PTR_ERR(port->pipe_ck);
964 
965 	snprintf(name, sizeof(name), "pcie-rst%d", slot);
966 	port->reset = devm_reset_control_get_optional_exclusive(dev, name);
967 	if (PTR_ERR(port->reset) == -EPROBE_DEFER)
968 		return PTR_ERR(port->reset);
969 
970 	/* some platforms may use default PHY setting */
971 	snprintf(name, sizeof(name), "pcie-phy%d", slot);
972 	port->phy = devm_phy_optional_get(dev, name);
973 	if (IS_ERR(port->phy))
974 		return PTR_ERR(port->phy);
975 
976 	port->slot = slot;
977 	port->pcie = pcie;
978 
979 	if (pcie->soc->setup_irq) {
980 		err = pcie->soc->setup_irq(port, node);
981 		if (err)
982 			return err;
983 	}
984 
985 	INIT_LIST_HEAD(&port->list);
986 	list_add_tail(&port->list, &pcie->ports);
987 
988 	return 0;
989 }
990 
991 static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
992 {
993 	struct device *dev = pcie->dev;
994 	struct platform_device *pdev = to_platform_device(dev);
995 	struct resource *regs;
996 	struct device_node *cfg_node;
997 	int err;
998 
999 	/* get shared registers, which are optional */
1000 	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "subsys");
1001 	if (regs) {
1002 		pcie->base = devm_ioremap_resource(dev, regs);
1003 		if (IS_ERR(pcie->base))
1004 			return PTR_ERR(pcie->base);
1005 	}
1006 
1007 	cfg_node = of_find_compatible_node(NULL, NULL,
1008 					   "mediatek,generic-pciecfg");
1009 	if (cfg_node) {
1010 		pcie->cfg = syscon_node_to_regmap(cfg_node);
1011 		of_node_put(cfg_node);
1012 		if (IS_ERR(pcie->cfg))
1013 			return PTR_ERR(pcie->cfg);
1014 	}
1015 
1016 	pcie->free_ck = devm_clk_get(dev, "free_ck");
1017 	if (IS_ERR(pcie->free_ck)) {
1018 		if (PTR_ERR(pcie->free_ck) == -EPROBE_DEFER)
1019 			return -EPROBE_DEFER;
1020 
1021 		pcie->free_ck = NULL;
1022 	}
1023 
1024 	pm_runtime_enable(dev);
1025 	pm_runtime_get_sync(dev);
1026 
1027 	/* enable top level clock */
1028 	err = clk_prepare_enable(pcie->free_ck);
1029 	if (err) {
1030 		dev_err(dev, "failed to enable free_ck\n");
1031 		goto err_free_ck;
1032 	}
1033 
1034 	return 0;
1035 
1036 err_free_ck:
1037 	pm_runtime_put_sync(dev);
1038 	pm_runtime_disable(dev);
1039 
1040 	return err;
1041 }
1042 
1043 static int mtk_pcie_setup(struct mtk_pcie *pcie)
1044 {
1045 	struct device *dev = pcie->dev;
1046 	struct device_node *node = dev->of_node, *child;
1047 	struct mtk_pcie_port *port, *tmp;
1048 	int err, slot;
1049 
1050 	slot = of_get_pci_domain_nr(dev->of_node);
1051 	if (slot < 0) {
1052 		for_each_available_child_of_node(node, child) {
1053 			err = of_pci_get_devfn(child);
1054 			if (err < 0) {
1055 				dev_err(dev, "failed to get devfn: %d\n", err);
1056 				goto error_put_node;
1057 			}
1058 
1059 			slot = PCI_SLOT(err);
1060 
1061 			err = mtk_pcie_parse_port(pcie, child, slot);
1062 			if (err)
1063 				goto error_put_node;
1064 		}
1065 	} else {
1066 		err = mtk_pcie_parse_port(pcie, node, slot);
1067 		if (err)
1068 			return err;
1069 	}
1070 
1071 	err = mtk_pcie_subsys_powerup(pcie);
1072 	if (err)
1073 		return err;
1074 
1075 	/* enable each port, and then check link status */
1076 	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
1077 		mtk_pcie_enable_port(port);
1078 
1079 	/* power down PCIe subsys if slots are all empty (link down) */
1080 	if (list_empty(&pcie->ports))
1081 		mtk_pcie_subsys_powerdown(pcie);
1082 
1083 	return 0;
1084 error_put_node:
1085 	of_node_put(child);
1086 	return err;
1087 }
1088 
1089 static int mtk_pcie_probe(struct platform_device *pdev)
1090 {
1091 	struct device *dev = &pdev->dev;
1092 	struct mtk_pcie *pcie;
1093 	struct pci_host_bridge *host;
1094 	int err;
1095 
1096 	host = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
1097 	if (!host)
1098 		return -ENOMEM;
1099 
1100 	pcie = pci_host_bridge_priv(host);
1101 
1102 	pcie->dev = dev;
1103 	pcie->soc = of_device_get_match_data(dev);
1104 	platform_set_drvdata(pdev, pcie);
1105 	INIT_LIST_HEAD(&pcie->ports);
1106 
1107 	err = mtk_pcie_setup(pcie);
1108 	if (err)
1109 		return err;
1110 
1111 	host->ops = pcie->soc->ops;
1112 	host->sysdata = pcie;
1113 	host->msi_domain = pcie->soc->no_msi;
1114 
1115 	err = pci_host_probe(host);
1116 	if (err)
1117 		goto put_resources;
1118 
1119 	return 0;
1120 
1121 put_resources:
1122 	if (!list_empty(&pcie->ports))
1123 		mtk_pcie_put_resources(pcie);
1124 
1125 	return err;
1126 }
1127 
1128 
1129 static void mtk_pcie_free_resources(struct mtk_pcie *pcie)
1130 {
1131 	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
1132 	struct list_head *windows = &host->windows;
1133 
1134 	pci_free_resource_list(windows);
1135 }
1136 
1137 static int mtk_pcie_remove(struct platform_device *pdev)
1138 {
1139 	struct mtk_pcie *pcie = platform_get_drvdata(pdev);
1140 	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
1141 
1142 	pci_stop_root_bus(host->bus);
1143 	pci_remove_root_bus(host->bus);
1144 	mtk_pcie_free_resources(pcie);
1145 
1146 	mtk_pcie_irq_teardown(pcie);
1147 
1148 	mtk_pcie_put_resources(pcie);
1149 
1150 	return 0;
1151 }
1152 
1153 static int mtk_pcie_suspend_noirq(struct device *dev)
1154 {
1155 	struct mtk_pcie *pcie = dev_get_drvdata(dev);
1156 	struct mtk_pcie_port *port;
1157 
1158 	if (list_empty(&pcie->ports))
1159 		return 0;
1160 
1161 	list_for_each_entry(port, &pcie->ports, list) {
1162 		clk_disable_unprepare(port->pipe_ck);
1163 		clk_disable_unprepare(port->obff_ck);
1164 		clk_disable_unprepare(port->axi_ck);
1165 		clk_disable_unprepare(port->aux_ck);
1166 		clk_disable_unprepare(port->ahb_ck);
1167 		clk_disable_unprepare(port->sys_ck);
1168 		phy_power_off(port->phy);
1169 		phy_exit(port->phy);
1170 	}
1171 
1172 	clk_disable_unprepare(pcie->free_ck);
1173 
1174 	return 0;
1175 }
1176 
1177 static int mtk_pcie_resume_noirq(struct device *dev)
1178 {
1179 	struct mtk_pcie *pcie = dev_get_drvdata(dev);
1180 	struct mtk_pcie_port *port, *tmp;
1181 
1182 	if (list_empty(&pcie->ports))
1183 		return 0;
1184 
1185 	clk_prepare_enable(pcie->free_ck);
1186 
1187 	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
1188 		mtk_pcie_enable_port(port);
1189 
1190 	/* In case of EP was removed while system suspend. */
1191 	if (list_empty(&pcie->ports))
1192 		clk_disable_unprepare(pcie->free_ck);
1193 
1194 	return 0;
1195 }
1196 
1197 static const struct dev_pm_ops mtk_pcie_pm_ops = {
1198 	NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq,
1199 				  mtk_pcie_resume_noirq)
1200 };
1201 
1202 static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
1203 	.no_msi = true,
1204 	.ops = &mtk_pcie_ops,
1205 	.startup = mtk_pcie_startup_port,
1206 };
1207 
1208 static const struct mtk_pcie_soc mtk_pcie_soc_mt2712 = {
1209 	.ops = &mtk_pcie_ops_v2,
1210 	.startup = mtk_pcie_startup_port_v2,
1211 	.setup_irq = mtk_pcie_setup_irq,
1212 };
1213 
1214 static const struct mtk_pcie_soc mtk_pcie_soc_mt7622 = {
1215 	.need_fix_class_id = true,
1216 	.ops = &mtk_pcie_ops_v2,
1217 	.startup = mtk_pcie_startup_port_v2,
1218 	.setup_irq = mtk_pcie_setup_irq,
1219 };
1220 
1221 static const struct mtk_pcie_soc mtk_pcie_soc_mt7629 = {
1222 	.need_fix_class_id = true,
1223 	.need_fix_device_id = true,
1224 	.device_id = PCI_DEVICE_ID_MEDIATEK_7629,
1225 	.ops = &mtk_pcie_ops_v2,
1226 	.startup = mtk_pcie_startup_port_v2,
1227 	.setup_irq = mtk_pcie_setup_irq,
1228 };
1229 
1230 static const struct of_device_id mtk_pcie_ids[] = {
1231 	{ .compatible = "mediatek,mt2701-pcie", .data = &mtk_pcie_soc_v1 },
1232 	{ .compatible = "mediatek,mt7623-pcie", .data = &mtk_pcie_soc_v1 },
1233 	{ .compatible = "mediatek,mt2712-pcie", .data = &mtk_pcie_soc_mt2712 },
1234 	{ .compatible = "mediatek,mt7622-pcie", .data = &mtk_pcie_soc_mt7622 },
1235 	{ .compatible = "mediatek,mt7629-pcie", .data = &mtk_pcie_soc_mt7629 },
1236 	{},
1237 };
1238 MODULE_DEVICE_TABLE(of, mtk_pcie_ids);
1239 
1240 static struct platform_driver mtk_pcie_driver = {
1241 	.probe = mtk_pcie_probe,
1242 	.remove = mtk_pcie_remove,
1243 	.driver = {
1244 		.name = "mtk-pcie",
1245 		.of_match_table = mtk_pcie_ids,
1246 		.suppress_bind_attrs = true,
1247 		.pm = &mtk_pcie_pm_ops,
1248 	},
1249 };
1250 module_platform_driver(mtk_pcie_driver);
1251 MODULE_LICENSE("GPL v2");
1252