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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/msi.h>
18#include <linux/module.h>
19#include <linux/of_address.h>
20#include <linux/of_pci.h>
21#include <linux/of_platform.h>
22#include <linux/pci.h>
23#include <linux/phy/phy.h>
24#include <linux/platform_device.h>
25#include <linux/pm_runtime.h>
26#include <linux/reset.h>
27
28#include "../pci.h"
29
30/* PCIe shared registers */
31#define PCIE_SYS_CFG 0x00
32#define PCIE_INT_ENABLE 0x0c
33#define PCIE_CFG_ADDR 0x20
34#define PCIE_CFG_DATA 0x24
35
36/* PCIe per port registers */
37#define PCIE_BAR0_SETUP 0x10
38#define PCIE_CLASS 0x34
39#define PCIE_LINK_STATUS 0x50
40
41#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
42#define PCIE_PORT_PERST(x) BIT(1 + (x))
43#define PCIE_PORT_LINKUP BIT(0)
44#define PCIE_BAR_MAP_MAX GENMASK(31, 16)
45
46#define PCIE_BAR_ENABLE BIT(0)
47#define PCIE_REVISION_ID BIT(0)
48#define PCIE_CLASS_CODE (0x60400 << 8)
49#define PCIE_CONF_REG(regn) (((regn) & GENMASK(7, 2)) | \
50 ((((regn) >> 8) & GENMASK(3, 0)) << 24))
51#define PCIE_CONF_FUN(fun) (((fun) << 8) & GENMASK(10, 8))
52#define PCIE_CONF_DEV(dev) (((dev) << 11) & GENMASK(15, 11))
53#define PCIE_CONF_BUS(bus) (((bus) << 16) & GENMASK(23, 16))
54#define PCIE_CONF_ADDR(regn, fun, dev, bus) \
55 (PCIE_CONF_REG(regn) | PCIE_CONF_FUN(fun) | \
56 PCIE_CONF_DEV(dev) | PCIE_CONF_BUS(bus))
57
58/* MediaTek specific configuration registers */
59#define PCIE_FTS_NUM 0x70c
60#define PCIE_FTS_NUM_MASK GENMASK(15, 8)
61#define PCIE_FTS_NUM_L0(x) ((x) & 0xff << 8)
62
63#define PCIE_FC_CREDIT 0x73c
64#define PCIE_FC_CREDIT_MASK (GENMASK(31, 31) | GENMASK(28, 16))
65#define PCIE_FC_CREDIT_VAL(x) ((x) << 16)
66
67/* PCIe V2 share registers */
68#define PCIE_SYS_CFG_V2 0x0
69#define PCIE_CSR_LTSSM_EN(x) BIT(0 + (x) * 8)
70#define PCIE_CSR_ASPM_L1_EN(x) BIT(1 + (x) * 8)
71
72/* PCIe V2 per-port registers */
73#define PCIE_MSI_VECTOR 0x0c0
74
75#define PCIE_CONF_VEND_ID 0x100
76#define PCIE_CONF_DEVICE_ID 0x102
77#define PCIE_CONF_CLASS_ID 0x106
78
79#define PCIE_INT_MASK 0x420
80#define INTX_MASK GENMASK(19, 16)
81#define INTX_SHIFT 16
82#define PCIE_INT_STATUS 0x424
83#define MSI_STATUS BIT(23)
84#define PCIE_IMSI_STATUS 0x42c
85#define PCIE_IMSI_ADDR 0x430
86#define MSI_MASK BIT(23)
87#define MTK_MSI_IRQS_NUM 32
88
89#define PCIE_AHB_TRANS_BASE0_L 0x438
90#define PCIE_AHB_TRANS_BASE0_H 0x43c
91#define AHB2PCIE_SIZE(x) ((x) & GENMASK(4, 0))
92#define PCIE_AXI_WINDOW0 0x448
93#define WIN_ENABLE BIT(7)
94/*
95 * Define PCIe to AHB window size as 2^33 to support max 8GB address space
96 * translate, support least 4GB DRAM size access from EP DMA(physical DRAM
97 * start from 0x40000000).
98 */
99#define PCIE2AHB_SIZE 0x21
100
101/* PCIe V2 configuration transaction header */
102#define PCIE_CFG_HEADER0 0x460
103#define PCIE_CFG_HEADER1 0x464
104#define PCIE_CFG_HEADER2 0x468
105#define PCIE_CFG_WDATA 0x470
106#define PCIE_APP_TLP_REQ 0x488
107#define PCIE_CFG_RDATA 0x48c
108#define APP_CFG_REQ BIT(0)
109#define APP_CPL_STATUS GENMASK(7, 5)
110
111#define CFG_WRRD_TYPE_0 4
112#define CFG_WR_FMT 2
113#define CFG_RD_FMT 0
114
115#define CFG_DW0_LENGTH(length) ((length) & GENMASK(9, 0))
116#define CFG_DW0_TYPE(type) (((type) << 24) & GENMASK(28, 24))
117#define CFG_DW0_FMT(fmt) (((fmt) << 29) & GENMASK(31, 29))
118#define CFG_DW2_REGN(regn) ((regn) & GENMASK(11, 2))
119#define CFG_DW2_FUN(fun) (((fun) << 16) & GENMASK(18, 16))
120#define CFG_DW2_DEV(dev) (((dev) << 19) & GENMASK(23, 19))
121#define CFG_DW2_BUS(bus) (((bus) << 24) & GENMASK(31, 24))
122#define CFG_HEADER_DW0(type, fmt) \
123 (CFG_DW0_LENGTH(1) | CFG_DW0_TYPE(type) | CFG_DW0_FMT(fmt))
124#define CFG_HEADER_DW1(where, size) \
125 (GENMASK(((size) - 1), 0) << ((where) & 0x3))
126#define CFG_HEADER_DW2(regn, fun, dev, bus) \
127 (CFG_DW2_REGN(regn) | CFG_DW2_FUN(fun) | \
128 CFG_DW2_DEV(dev) | CFG_DW2_BUS(bus))
129
130#define PCIE_RST_CTRL 0x510
131#define PCIE_PHY_RSTB BIT(0)
132#define PCIE_PIPE_SRSTB BIT(1)
133#define PCIE_MAC_SRSTB BIT(2)
134#define PCIE_CRSTB BIT(3)
135#define PCIE_PERSTB BIT(8)
136#define PCIE_LINKDOWN_RST_EN GENMASK(15, 13)
137#define PCIE_LINK_STATUS_V2 0x804
138#define PCIE_PORT_LINKUP_V2 BIT(10)
139
140struct mtk_pcie_port;
141
142/**
143 * struct mtk_pcie_soc - differentiate between host generations
144 * @need_fix_class_id: whether this host's class ID needed to be fixed or not
145 * @need_fix_device_id: whether this host's device ID needed to be fixed or not
146 * @device_id: device ID which this host need to be fixed
147 * @ops: pointer to configuration access functions
148 * @startup: pointer to controller setting functions
149 * @setup_irq: pointer to initialize IRQ functions
150 */
151struct mtk_pcie_soc {
152 bool need_fix_class_id;
153 bool need_fix_device_id;
154 unsigned int device_id;
155 struct pci_ops *ops;
156 int (*startup)(struct mtk_pcie_port *port);
157 int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node);
158};
159
160/**
161 * struct mtk_pcie_port - PCIe port information
162 * @base: IO mapped register base
163 * @list: port list
164 * @pcie: pointer to PCIe host info
165 * @reset: pointer to port reset control
166 * @sys_ck: pointer to transaction/data link layer clock
167 * @ahb_ck: pointer to AHB slave interface operating clock for CSR access
168 * and RC initiated MMIO access
169 * @axi_ck: pointer to application layer MMIO channel operating clock
170 * @aux_ck: pointer to pe2_mac_bridge and pe2_mac_core operating clock
171 * when pcie_mac_ck/pcie_pipe_ck is turned off
172 * @obff_ck: pointer to OBFF functional block operating clock
173 * @pipe_ck: pointer to LTSSM and PHY/MAC layer operating clock
174 * @phy: pointer to PHY control block
175 * @slot: port slot
176 * @irq: GIC irq
177 * @irq_domain: legacy INTx IRQ domain
178 * @inner_domain: inner IRQ domain
179 * @msi_domain: MSI IRQ domain
180 * @lock: protect the msi_irq_in_use bitmap
181 * @msi_irq_in_use: bit map for assigned MSI IRQ
182 */
183struct mtk_pcie_port {
184 void __iomem *base;
185 struct list_head list;
186 struct mtk_pcie *pcie;
187 struct reset_control *reset;
188 struct clk *sys_ck;
189 struct clk *ahb_ck;
190 struct clk *axi_ck;
191 struct clk *aux_ck;
192 struct clk *obff_ck;
193 struct clk *pipe_ck;
194 struct phy *phy;
195 u32 slot;
196 int irq;
197 struct irq_domain *irq_domain;
198 struct irq_domain *inner_domain;
199 struct irq_domain *msi_domain;
200 struct mutex lock;
201 DECLARE_BITMAP(msi_irq_in_use, MTK_MSI_IRQS_NUM);
202};
203
204/**
205 * struct mtk_pcie - PCIe host information
206 * @dev: pointer to PCIe device
207 * @base: IO mapped register base
208 * @free_ck: free-run reference clock
209 * @mem: non-prefetchable memory resource
210 * @ports: pointer to PCIe port information
211 * @soc: pointer to SoC-dependent operations
212 */
213struct mtk_pcie {
214 struct device *dev;
215 void __iomem *base;
216 struct clk *free_ck;
217
218 struct list_head ports;
219 const struct mtk_pcie_soc *soc;
220};
221
222static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie)
223{
224 struct device *dev = pcie->dev;
225
226 clk_disable_unprepare(pcie->free_ck);
227
228 pm_runtime_put_sync(dev);
229 pm_runtime_disable(dev);
230}
231
232static void mtk_pcie_port_free(struct mtk_pcie_port *port)
233{
234 struct mtk_pcie *pcie = port->pcie;
235 struct device *dev = pcie->dev;
236
237 devm_iounmap(dev, port->base);
238 list_del(&port->list);
239 devm_kfree(dev, port);
240}
241
242static void mtk_pcie_put_resources(struct mtk_pcie *pcie)
243{
244 struct mtk_pcie_port *port, *tmp;
245
246 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
247 phy_power_off(port->phy);
248 phy_exit(port->phy);
249 clk_disable_unprepare(port->pipe_ck);
250 clk_disable_unprepare(port->obff_ck);
251 clk_disable_unprepare(port->axi_ck);
252 clk_disable_unprepare(port->aux_ck);
253 clk_disable_unprepare(port->ahb_ck);
254 clk_disable_unprepare(port->sys_ck);
255 mtk_pcie_port_free(port);
256 }
257
258 mtk_pcie_subsys_powerdown(pcie);
259}
260
261static int mtk_pcie_check_cfg_cpld(struct mtk_pcie_port *port)
262{
263 u32 val;
264 int err;
265
266 err = readl_poll_timeout_atomic(port->base + PCIE_APP_TLP_REQ, val,
267 !(val & APP_CFG_REQ), 10,
268 100 * USEC_PER_MSEC);
269 if (err)
270 return PCIBIOS_SET_FAILED;
271
272 if (readl(port->base + PCIE_APP_TLP_REQ) & APP_CPL_STATUS)
273 return PCIBIOS_SET_FAILED;
274
275 return PCIBIOS_SUCCESSFUL;
276}
277
278static int mtk_pcie_hw_rd_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
279 int where, int size, u32 *val)
280{
281 u32 tmp;
282
283 /* Write PCIe configuration transaction header for Cfgrd */
284 writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_RD_FMT),
285 port->base + PCIE_CFG_HEADER0);
286 writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
287 writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_SLOT(devfn), bus),
288 port->base + PCIE_CFG_HEADER2);
289
290 /* Trigger h/w to transmit Cfgrd TLP */
291 tmp = readl(port->base + PCIE_APP_TLP_REQ);
292 tmp |= APP_CFG_REQ;
293 writel(tmp, port->base + PCIE_APP_TLP_REQ);
294
295 /* Check completion status */
296 if (mtk_pcie_check_cfg_cpld(port))
297 return PCIBIOS_SET_FAILED;
298
299 /* Read cpld payload of Cfgrd */
300 *val = readl(port->base + PCIE_CFG_RDATA);
301
302 if (size == 1)
303 *val = (*val >> (8 * (where & 3))) & 0xff;
304 else if (size == 2)
305 *val = (*val >> (8 * (where & 3))) & 0xffff;
306
307 return PCIBIOS_SUCCESSFUL;
308}
309
310static int mtk_pcie_hw_wr_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
311 int where, int size, u32 val)
312{
313 /* Write PCIe configuration transaction header for Cfgwr */
314 writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_WR_FMT),
315 port->base + PCIE_CFG_HEADER0);
316 writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
317 writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_SLOT(devfn), bus),
318 port->base + PCIE_CFG_HEADER2);
319
320 /* Write Cfgwr data */
321 val = val << 8 * (where & 3);
322 writel(val, port->base + PCIE_CFG_WDATA);
323
324 /* Trigger h/w to transmit Cfgwr TLP */
325 val = readl(port->base + PCIE_APP_TLP_REQ);
326 val |= APP_CFG_REQ;
327 writel(val, port->base + PCIE_APP_TLP_REQ);
328
329 /* Check completion status */
330 return mtk_pcie_check_cfg_cpld(port);
331}
332
333static struct mtk_pcie_port *mtk_pcie_find_port(struct pci_bus *bus,
334 unsigned int devfn)
335{
336 struct mtk_pcie *pcie = bus->sysdata;
337 struct mtk_pcie_port *port;
338 struct pci_dev *dev = NULL;
339
340 /*
341 * Walk the bus hierarchy to get the devfn value
342 * of the port in the root bus.
343 */
344 while (bus && bus->number) {
345 dev = bus->self;
346 bus = dev->bus;
347 devfn = dev->devfn;
348 }
349
350 list_for_each_entry(port, &pcie->ports, list)
351 if (port->slot == PCI_SLOT(devfn))
352 return port;
353
354 return NULL;
355}
356
357static int mtk_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
358 int where, int size, u32 *val)
359{
360 struct mtk_pcie_port *port;
361 u32 bn = bus->number;
362 int ret;
363
364 port = mtk_pcie_find_port(bus, devfn);
365 if (!port) {
366 *val = ~0;
367 return PCIBIOS_DEVICE_NOT_FOUND;
368 }
369
370 ret = mtk_pcie_hw_rd_cfg(port, bn, devfn, where, size, val);
371 if (ret)
372 *val = ~0;
373
374 return ret;
375}
376
377static int mtk_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
378 int where, int size, u32 val)
379{
380 struct mtk_pcie_port *port;
381 u32 bn = bus->number;
382
383 port = mtk_pcie_find_port(bus, devfn);
384 if (!port)
385 return PCIBIOS_DEVICE_NOT_FOUND;
386
387 return mtk_pcie_hw_wr_cfg(port, bn, devfn, where, size, val);
388}
389
390static struct pci_ops mtk_pcie_ops_v2 = {
391 .read = mtk_pcie_config_read,
392 .write = mtk_pcie_config_write,
393};
394
395static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
396{
397 struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
398 phys_addr_t addr;
399
400 /* MT2712/MT7622 only support 32-bit MSI addresses */
401 addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
402 msg->address_hi = 0;
403 msg->address_lo = lower_32_bits(addr);
404
405 msg->data = data->hwirq;
406
407 dev_dbg(port->pcie->dev, "msi#%d address_hi %#x address_lo %#x\n",
408 (int)data->hwirq, msg->address_hi, msg->address_lo);
409}
410
411static int mtk_msi_set_affinity(struct irq_data *irq_data,
412 const struct cpumask *mask, bool force)
413{
414 return -EINVAL;
415}
416
417static void mtk_msi_ack_irq(struct irq_data *data)
418{
419 struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
420 u32 hwirq = data->hwirq;
421
422 writel(1 << hwirq, port->base + PCIE_IMSI_STATUS);
423}
424
425static struct irq_chip mtk_msi_bottom_irq_chip = {
426 .name = "MTK MSI",
427 .irq_compose_msi_msg = mtk_compose_msi_msg,
428 .irq_set_affinity = mtk_msi_set_affinity,
429 .irq_ack = mtk_msi_ack_irq,
430};
431
432static int mtk_pcie_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
433 unsigned int nr_irqs, void *args)
434{
435 struct mtk_pcie_port *port = domain->host_data;
436 unsigned long bit;
437
438 WARN_ON(nr_irqs != 1);
439 mutex_lock(&port->lock);
440
441 bit = find_first_zero_bit(port->msi_irq_in_use, MTK_MSI_IRQS_NUM);
442 if (bit >= MTK_MSI_IRQS_NUM) {
443 mutex_unlock(&port->lock);
444 return -ENOSPC;
445 }
446
447 __set_bit(bit, port->msi_irq_in_use);
448
449 mutex_unlock(&port->lock);
450
451 irq_domain_set_info(domain, virq, bit, &mtk_msi_bottom_irq_chip,
452 domain->host_data, handle_edge_irq,
453 NULL, NULL);
454
455 return 0;
456}
457
458static void mtk_pcie_irq_domain_free(struct irq_domain *domain,
459 unsigned int virq, unsigned int nr_irqs)
460{
461 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
462 struct mtk_pcie_port *port = irq_data_get_irq_chip_data(d);
463
464 mutex_lock(&port->lock);
465
466 if (!test_bit(d->hwirq, port->msi_irq_in_use))
467 dev_err(port->pcie->dev, "trying to free unused MSI#%lu\n",
468 d->hwirq);
469 else
470 __clear_bit(d->hwirq, port->msi_irq_in_use);
471
472 mutex_unlock(&port->lock);
473
474 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
475}
476
477static const struct irq_domain_ops msi_domain_ops = {
478 .alloc = mtk_pcie_irq_domain_alloc,
479 .free = mtk_pcie_irq_domain_free,
480};
481
482static struct irq_chip mtk_msi_irq_chip = {
483 .name = "MTK PCIe MSI",
484 .irq_ack = irq_chip_ack_parent,
485 .irq_mask = pci_msi_mask_irq,
486 .irq_unmask = pci_msi_unmask_irq,
487};
488
489static struct msi_domain_info mtk_msi_domain_info = {
490 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
491 MSI_FLAG_PCI_MSIX),
492 .chip = &mtk_msi_irq_chip,
493};
494
495static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
496{
497 struct fwnode_handle *fwnode = of_node_to_fwnode(port->pcie->dev->of_node);
498
499 mutex_init(&port->lock);
500
501 port->inner_domain = irq_domain_create_linear(fwnode, MTK_MSI_IRQS_NUM,
502 &msi_domain_ops, port);
503 if (!port->inner_domain) {
504 dev_err(port->pcie->dev, "failed to create IRQ domain\n");
505 return -ENOMEM;
506 }
507
508 port->msi_domain = pci_msi_create_irq_domain(fwnode, &mtk_msi_domain_info,
509 port->inner_domain);
510 if (!port->msi_domain) {
511 dev_err(port->pcie->dev, "failed to create MSI domain\n");
512 irq_domain_remove(port->inner_domain);
513 return -ENOMEM;
514 }
515
516 return 0;
517}
518
519static void mtk_pcie_enable_msi(struct mtk_pcie_port *port)
520{
521 u32 val;
522 phys_addr_t msg_addr;
523
524 msg_addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
525 val = lower_32_bits(msg_addr);
526 writel(val, port->base + PCIE_IMSI_ADDR);
527
528 val = readl(port->base + PCIE_INT_MASK);
529 val &= ~MSI_MASK;
530 writel(val, port->base + PCIE_INT_MASK);
531}
532
533static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
534{
535 struct mtk_pcie_port *port, *tmp;
536
537 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
538 irq_set_chained_handler_and_data(port->irq, NULL, NULL);
539
540 if (port->irq_domain)
541 irq_domain_remove(port->irq_domain);
542
543 if (IS_ENABLED(CONFIG_PCI_MSI)) {
544 if (port->msi_domain)
545 irq_domain_remove(port->msi_domain);
546 if (port->inner_domain)
547 irq_domain_remove(port->inner_domain);
548 }
549
550 irq_dispose_mapping(port->irq);
551 }
552}
553
554static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
555 irq_hw_number_t hwirq)
556{
557 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
558 irq_set_chip_data(irq, domain->host_data);
559
560 return 0;
561}
562
563static const struct irq_domain_ops intx_domain_ops = {
564 .map = mtk_pcie_intx_map,
565};
566
567static int mtk_pcie_init_irq_domain(struct mtk_pcie_port *port,
568 struct device_node *node)
569{
570 struct device *dev = port->pcie->dev;
571 struct device_node *pcie_intc_node;
572 int ret;
573
574 /* Setup INTx */
575 pcie_intc_node = of_get_next_child(node, NULL);
576 if (!pcie_intc_node) {
577 dev_err(dev, "no PCIe Intc node found\n");
578 return -ENODEV;
579 }
580
581 port->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
582 &intx_domain_ops, port);
583 of_node_put(pcie_intc_node);
584 if (!port->irq_domain) {
585 dev_err(dev, "failed to get INTx IRQ domain\n");
586 return -ENODEV;
587 }
588
589 if (IS_ENABLED(CONFIG_PCI_MSI)) {
590 ret = mtk_pcie_allocate_msi_domains(port);
591 if (ret)
592 return ret;
593 }
594
595 return 0;
596}
597
598static void mtk_pcie_intr_handler(struct irq_desc *desc)
599{
600 struct mtk_pcie_port *port = irq_desc_get_handler_data(desc);
601 struct irq_chip *irqchip = irq_desc_get_chip(desc);
602 unsigned long status;
603 u32 virq;
604 u32 bit = INTX_SHIFT;
605
606 chained_irq_enter(irqchip, desc);
607
608 status = readl(port->base + PCIE_INT_STATUS);
609 if (status & INTX_MASK) {
610 for_each_set_bit_from(bit, &status, PCI_NUM_INTX + INTX_SHIFT) {
611 /* Clear the INTx */
612 writel(1 << bit, port->base + PCIE_INT_STATUS);
613 virq = irq_find_mapping(port->irq_domain,
614 bit - INTX_SHIFT);
615 generic_handle_irq(virq);
616 }
617 }
618
619 if (IS_ENABLED(CONFIG_PCI_MSI)) {
620 if (status & MSI_STATUS){
621 unsigned long imsi_status;
622
623 while ((imsi_status = readl(port->base + PCIE_IMSI_STATUS))) {
624 for_each_set_bit(bit, &imsi_status, MTK_MSI_IRQS_NUM) {
625 virq = irq_find_mapping(port->inner_domain, bit);
626 generic_handle_irq(virq);
627 }
628 }
629 /* Clear MSI interrupt status */
630 writel(MSI_STATUS, port->base + PCIE_INT_STATUS);
631 }
632 }
633
634 chained_irq_exit(irqchip, desc);
635}
636
637static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
638 struct device_node *node)
639{
640 struct mtk_pcie *pcie = port->pcie;
641 struct device *dev = pcie->dev;
642 struct platform_device *pdev = to_platform_device(dev);
643 int err;
644
645 err = mtk_pcie_init_irq_domain(port, node);
646 if (err) {
647 dev_err(dev, "failed to init PCIe IRQ domain\n");
648 return err;
649 }
650
651 port->irq = platform_get_irq(pdev, port->slot);
652 if (port->irq < 0)
653 return port->irq;
654
655 irq_set_chained_handler_and_data(port->irq,
656 mtk_pcie_intr_handler, port);
657
658 return 0;
659}
660
661static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
662{
663 struct mtk_pcie *pcie = port->pcie;
664 struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
665 struct resource *mem = NULL;
666 struct resource_entry *entry;
667 const struct mtk_pcie_soc *soc = port->pcie->soc;
668 u32 val;
669 int err;
670
671 entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
672 if (entry)
673 mem = entry->res;
674 if (!mem)
675 return -EINVAL;
676
677 /* MT7622 platforms need to enable LTSSM and ASPM from PCIe subsys */
678 if (pcie->base) {
679 val = readl(pcie->base + PCIE_SYS_CFG_V2);
680 val |= PCIE_CSR_LTSSM_EN(port->slot) |
681 PCIE_CSR_ASPM_L1_EN(port->slot);
682 writel(val, pcie->base + PCIE_SYS_CFG_V2);
683 }
684
685 /* Assert all reset signals */
686 writel(0, port->base + PCIE_RST_CTRL);
687
688 /*
689 * Enable PCIe link down reset, if link status changed from link up to
690 * link down, this will reset MAC control registers and configuration
691 * space.
692 */
693 writel(PCIE_LINKDOWN_RST_EN, port->base + PCIE_RST_CTRL);
694
695 /* De-assert PHY, PE, PIPE, MAC and configuration reset */
696 val = readl(port->base + PCIE_RST_CTRL);
697 val |= PCIE_PHY_RSTB | PCIE_PERSTB | PCIE_PIPE_SRSTB |
698 PCIE_MAC_SRSTB | PCIE_CRSTB;
699 writel(val, port->base + PCIE_RST_CTRL);
700
701 /* Set up vendor ID and class code */
702 if (soc->need_fix_class_id) {
703 val = PCI_VENDOR_ID_MEDIATEK;
704 writew(val, port->base + PCIE_CONF_VEND_ID);
705
706 val = PCI_CLASS_BRIDGE_PCI;
707 writew(val, port->base + PCIE_CONF_CLASS_ID);
708 }
709
710 if (soc->need_fix_device_id)
711 writew(soc->device_id, port->base + PCIE_CONF_DEVICE_ID);
712
713 /* 100ms timeout value should be enough for Gen1/2 training */
714 err = readl_poll_timeout(port->base + PCIE_LINK_STATUS_V2, val,
715 !!(val & PCIE_PORT_LINKUP_V2), 20,
716 100 * USEC_PER_MSEC);
717 if (err)
718 return -ETIMEDOUT;
719
720 /* Set INTx mask */
721 val = readl(port->base + PCIE_INT_MASK);
722 val &= ~INTX_MASK;
723 writel(val, port->base + PCIE_INT_MASK);
724
725 if (IS_ENABLED(CONFIG_PCI_MSI))
726 mtk_pcie_enable_msi(port);
727
728 /* Set AHB to PCIe translation windows */
729 val = lower_32_bits(mem->start) |
730 AHB2PCIE_SIZE(fls(resource_size(mem)));
731 writel(val, port->base + PCIE_AHB_TRANS_BASE0_L);
732
733 val = upper_32_bits(mem->start);
734 writel(val, port->base + PCIE_AHB_TRANS_BASE0_H);
735
736 /* Set PCIe to AXI translation memory space.*/
737 val = PCIE2AHB_SIZE | WIN_ENABLE;
738 writel(val, port->base + PCIE_AXI_WINDOW0);
739
740 return 0;
741}
742
743static void __iomem *mtk_pcie_map_bus(struct pci_bus *bus,
744 unsigned int devfn, int where)
745{
746 struct mtk_pcie *pcie = bus->sysdata;
747
748 writel(PCIE_CONF_ADDR(where, PCI_FUNC(devfn), PCI_SLOT(devfn),
749 bus->number), pcie->base + PCIE_CFG_ADDR);
750
751 return pcie->base + PCIE_CFG_DATA + (where & 3);
752}
753
754static struct pci_ops mtk_pcie_ops = {
755 .map_bus = mtk_pcie_map_bus,
756 .read = pci_generic_config_read,
757 .write = pci_generic_config_write,
758};
759
760static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
761{
762 struct mtk_pcie *pcie = port->pcie;
763 u32 func = PCI_FUNC(port->slot << 3);
764 u32 slot = PCI_SLOT(port->slot << 3);
765 u32 val;
766 int err;
767
768 /* assert port PERST_N */
769 val = readl(pcie->base + PCIE_SYS_CFG);
770 val |= PCIE_PORT_PERST(port->slot);
771 writel(val, pcie->base + PCIE_SYS_CFG);
772
773 /* de-assert port PERST_N */
774 val = readl(pcie->base + PCIE_SYS_CFG);
775 val &= ~PCIE_PORT_PERST(port->slot);
776 writel(val, pcie->base + PCIE_SYS_CFG);
777
778 /* 100ms timeout value should be enough for Gen1/2 training */
779 err = readl_poll_timeout(port->base + PCIE_LINK_STATUS, val,
780 !!(val & PCIE_PORT_LINKUP), 20,
781 100 * USEC_PER_MSEC);
782 if (err)
783 return -ETIMEDOUT;
784
785 /* enable interrupt */
786 val = readl(pcie->base + PCIE_INT_ENABLE);
787 val |= PCIE_PORT_INT_EN(port->slot);
788 writel(val, pcie->base + PCIE_INT_ENABLE);
789
790 /* map to all DDR region. We need to set it before cfg operation. */
791 writel(PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
792 port->base + PCIE_BAR0_SETUP);
793
794 /* configure class code and revision ID */
795 writel(PCIE_CLASS_CODE | PCIE_REVISION_ID, port->base + PCIE_CLASS);
796
797 /* configure FC credit */
798 writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
799 pcie->base + PCIE_CFG_ADDR);
800 val = readl(pcie->base + PCIE_CFG_DATA);
801 val &= ~PCIE_FC_CREDIT_MASK;
802 val |= PCIE_FC_CREDIT_VAL(0x806c);
803 writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
804 pcie->base + PCIE_CFG_ADDR);
805 writel(val, pcie->base + PCIE_CFG_DATA);
806
807 /* configure RC FTS number to 250 when it leaves L0s */
808 writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
809 pcie->base + PCIE_CFG_ADDR);
810 val = readl(pcie->base + PCIE_CFG_DATA);
811 val &= ~PCIE_FTS_NUM_MASK;
812 val |= PCIE_FTS_NUM_L0(0x50);
813 writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
814 pcie->base + PCIE_CFG_ADDR);
815 writel(val, pcie->base + PCIE_CFG_DATA);
816
817 return 0;
818}
819
820static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
821{
822 struct mtk_pcie *pcie = port->pcie;
823 struct device *dev = pcie->dev;
824 int err;
825
826 err = clk_prepare_enable(port->sys_ck);
827 if (err) {
828 dev_err(dev, "failed to enable sys_ck%d clock\n", port->slot);
829 goto err_sys_clk;
830 }
831
832 err = clk_prepare_enable(port->ahb_ck);
833 if (err) {
834 dev_err(dev, "failed to enable ahb_ck%d\n", port->slot);
835 goto err_ahb_clk;
836 }
837
838 err = clk_prepare_enable(port->aux_ck);
839 if (err) {
840 dev_err(dev, "failed to enable aux_ck%d\n", port->slot);
841 goto err_aux_clk;
842 }
843
844 err = clk_prepare_enable(port->axi_ck);
845 if (err) {
846 dev_err(dev, "failed to enable axi_ck%d\n", port->slot);
847 goto err_axi_clk;
848 }
849
850 err = clk_prepare_enable(port->obff_ck);
851 if (err) {
852 dev_err(dev, "failed to enable obff_ck%d\n", port->slot);
853 goto err_obff_clk;
854 }
855
856 err = clk_prepare_enable(port->pipe_ck);
857 if (err) {
858 dev_err(dev, "failed to enable pipe_ck%d\n", port->slot);
859 goto err_pipe_clk;
860 }
861
862 reset_control_assert(port->reset);
863 reset_control_deassert(port->reset);
864
865 err = phy_init(port->phy);
866 if (err) {
867 dev_err(dev, "failed to initialize port%d phy\n", port->slot);
868 goto err_phy_init;
869 }
870
871 err = phy_power_on(port->phy);
872 if (err) {
873 dev_err(dev, "failed to power on port%d phy\n", port->slot);
874 goto err_phy_on;
875 }
876
877 if (!pcie->soc->startup(port))
878 return;
879
880 dev_info(dev, "Port%d link down\n", port->slot);
881
882 phy_power_off(port->phy);
883err_phy_on:
884 phy_exit(port->phy);
885err_phy_init:
886 clk_disable_unprepare(port->pipe_ck);
887err_pipe_clk:
888 clk_disable_unprepare(port->obff_ck);
889err_obff_clk:
890 clk_disable_unprepare(port->axi_ck);
891err_axi_clk:
892 clk_disable_unprepare(port->aux_ck);
893err_aux_clk:
894 clk_disable_unprepare(port->ahb_ck);
895err_ahb_clk:
896 clk_disable_unprepare(port->sys_ck);
897err_sys_clk:
898 mtk_pcie_port_free(port);
899}
900
901static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
902 struct device_node *node,
903 int slot)
904{
905 struct mtk_pcie_port *port;
906 struct device *dev = pcie->dev;
907 struct platform_device *pdev = to_platform_device(dev);
908 char name[10];
909 int err;
910
911 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
912 if (!port)
913 return -ENOMEM;
914
915 snprintf(name, sizeof(name), "port%d", slot);
916 port->base = devm_platform_ioremap_resource_byname(pdev, name);
917 if (IS_ERR(port->base)) {
918 dev_err(dev, "failed to map port%d base\n", slot);
919 return PTR_ERR(port->base);
920 }
921
922 snprintf(name, sizeof(name), "sys_ck%d", slot);
923 port->sys_ck = devm_clk_get(dev, name);
924 if (IS_ERR(port->sys_ck)) {
925 dev_err(dev, "failed to get sys_ck%d clock\n", slot);
926 return PTR_ERR(port->sys_ck);
927 }
928
929 /* sys_ck might be divided into the following parts in some chips */
930 snprintf(name, sizeof(name), "ahb_ck%d", slot);
931 port->ahb_ck = devm_clk_get_optional(dev, name);
932 if (IS_ERR(port->ahb_ck))
933 return PTR_ERR(port->ahb_ck);
934
935 snprintf(name, sizeof(name), "axi_ck%d", slot);
936 port->axi_ck = devm_clk_get_optional(dev, name);
937 if (IS_ERR(port->axi_ck))
938 return PTR_ERR(port->axi_ck);
939
940 snprintf(name, sizeof(name), "aux_ck%d", slot);
941 port->aux_ck = devm_clk_get_optional(dev, name);
942 if (IS_ERR(port->aux_ck))
943 return PTR_ERR(port->aux_ck);
944
945 snprintf(name, sizeof(name), "obff_ck%d", slot);
946 port->obff_ck = devm_clk_get_optional(dev, name);
947 if (IS_ERR(port->obff_ck))
948 return PTR_ERR(port->obff_ck);
949
950 snprintf(name, sizeof(name), "pipe_ck%d", slot);
951 port->pipe_ck = devm_clk_get_optional(dev, name);
952 if (IS_ERR(port->pipe_ck))
953 return PTR_ERR(port->pipe_ck);
954
955 snprintf(name, sizeof(name), "pcie-rst%d", slot);
956 port->reset = devm_reset_control_get_optional_exclusive(dev, name);
957 if (PTR_ERR(port->reset) == -EPROBE_DEFER)
958 return PTR_ERR(port->reset);
959
960 /* some platforms may use default PHY setting */
961 snprintf(name, sizeof(name), "pcie-phy%d", slot);
962 port->phy = devm_phy_optional_get(dev, name);
963 if (IS_ERR(port->phy))
964 return PTR_ERR(port->phy);
965
966 port->slot = slot;
967 port->pcie = pcie;
968
969 if (pcie->soc->setup_irq) {
970 err = pcie->soc->setup_irq(port, node);
971 if (err)
972 return err;
973 }
974
975 INIT_LIST_HEAD(&port->list);
976 list_add_tail(&port->list, &pcie->ports);
977
978 return 0;
979}
980
981static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
982{
983 struct device *dev = pcie->dev;
984 struct platform_device *pdev = to_platform_device(dev);
985 struct resource *regs;
986 int err;
987
988 /* get shared registers, which are optional */
989 regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "subsys");
990 if (regs) {
991 pcie->base = devm_ioremap_resource(dev, regs);
992 if (IS_ERR(pcie->base)) {
993 dev_err(dev, "failed to map shared register\n");
994 return PTR_ERR(pcie->base);
995 }
996 }
997
998 pcie->free_ck = devm_clk_get(dev, "free_ck");
999 if (IS_ERR(pcie->free_ck)) {
1000 if (PTR_ERR(pcie->free_ck) == -EPROBE_DEFER)
1001 return -EPROBE_DEFER;
1002
1003 pcie->free_ck = NULL;
1004 }
1005
1006 pm_runtime_enable(dev);
1007 pm_runtime_get_sync(dev);
1008
1009 /* enable top level clock */
1010 err = clk_prepare_enable(pcie->free_ck);
1011 if (err) {
1012 dev_err(dev, "failed to enable free_ck\n");
1013 goto err_free_ck;
1014 }
1015
1016 return 0;
1017
1018err_free_ck:
1019 pm_runtime_put_sync(dev);
1020 pm_runtime_disable(dev);
1021
1022 return err;
1023}
1024
1025static int mtk_pcie_setup(struct mtk_pcie *pcie)
1026{
1027 struct device *dev = pcie->dev;
1028 struct device_node *node = dev->of_node, *child;
1029 struct mtk_pcie_port *port, *tmp;
1030 int err;
1031
1032 for_each_available_child_of_node(node, child) {
1033 int slot;
1034
1035 err = of_pci_get_devfn(child);
1036 if (err < 0) {
1037 dev_err(dev, "failed to parse devfn: %d\n", err);
1038 return err;
1039 }
1040
1041 slot = PCI_SLOT(err);
1042
1043 err = mtk_pcie_parse_port(pcie, child, slot);
1044 if (err)
1045 return err;
1046 }
1047
1048 err = mtk_pcie_subsys_powerup(pcie);
1049 if (err)
1050 return err;
1051
1052 /* enable each port, and then check link status */
1053 list_for_each_entry_safe(port, tmp, &pcie->ports, list)
1054 mtk_pcie_enable_port(port);
1055
1056 /* power down PCIe subsys if slots are all empty (link down) */
1057 if (list_empty(&pcie->ports))
1058 mtk_pcie_subsys_powerdown(pcie);
1059
1060 return 0;
1061}
1062
1063static int mtk_pcie_probe(struct platform_device *pdev)
1064{
1065 struct device *dev = &pdev->dev;
1066 struct mtk_pcie *pcie;
1067 struct pci_host_bridge *host;
1068 int err;
1069
1070 host = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
1071 if (!host)
1072 return -ENOMEM;
1073
1074 pcie = pci_host_bridge_priv(host);
1075
1076 pcie->dev = dev;
1077 pcie->soc = of_device_get_match_data(dev);
1078 platform_set_drvdata(pdev, pcie);
1079 INIT_LIST_HEAD(&pcie->ports);
1080
1081 err = mtk_pcie_setup(pcie);
1082 if (err)
1083 return err;
1084
1085 host->ops = pcie->soc->ops;
1086 host->sysdata = pcie;
1087
1088 err = pci_host_probe(host);
1089 if (err)
1090 goto put_resources;
1091
1092 return 0;
1093
1094put_resources:
1095 if (!list_empty(&pcie->ports))
1096 mtk_pcie_put_resources(pcie);
1097
1098 return err;
1099}
1100
1101
1102static void mtk_pcie_free_resources(struct mtk_pcie *pcie)
1103{
1104 struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
1105 struct list_head *windows = &host->windows;
1106
1107 pci_free_resource_list(windows);
1108}
1109
1110static int mtk_pcie_remove(struct platform_device *pdev)
1111{
1112 struct mtk_pcie *pcie = platform_get_drvdata(pdev);
1113 struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
1114
1115 pci_stop_root_bus(host->bus);
1116 pci_remove_root_bus(host->bus);
1117 mtk_pcie_free_resources(pcie);
1118
1119 mtk_pcie_irq_teardown(pcie);
1120
1121 mtk_pcie_put_resources(pcie);
1122
1123 return 0;
1124}
1125
1126static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev)
1127{
1128 struct mtk_pcie *pcie = dev_get_drvdata(dev);
1129 struct mtk_pcie_port *port;
1130
1131 if (list_empty(&pcie->ports))
1132 return 0;
1133
1134 list_for_each_entry(port, &pcie->ports, list) {
1135 clk_disable_unprepare(port->pipe_ck);
1136 clk_disable_unprepare(port->obff_ck);
1137 clk_disable_unprepare(port->axi_ck);
1138 clk_disable_unprepare(port->aux_ck);
1139 clk_disable_unprepare(port->ahb_ck);
1140 clk_disable_unprepare(port->sys_ck);
1141 phy_power_off(port->phy);
1142 phy_exit(port->phy);
1143 }
1144
1145 clk_disable_unprepare(pcie->free_ck);
1146
1147 return 0;
1148}
1149
1150static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
1151{
1152 struct mtk_pcie *pcie = dev_get_drvdata(dev);
1153 struct mtk_pcie_port *port, *tmp;
1154
1155 if (list_empty(&pcie->ports))
1156 return 0;
1157
1158 clk_prepare_enable(pcie->free_ck);
1159
1160 list_for_each_entry_safe(port, tmp, &pcie->ports, list)
1161 mtk_pcie_enable_port(port);
1162
1163 /* In case of EP was removed while system suspend. */
1164 if (list_empty(&pcie->ports))
1165 clk_disable_unprepare(pcie->free_ck);
1166
1167 return 0;
1168}
1169
1170static const struct dev_pm_ops mtk_pcie_pm_ops = {
1171 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq,
1172 mtk_pcie_resume_noirq)
1173};
1174
1175static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
1176 .ops = &mtk_pcie_ops,
1177 .startup = mtk_pcie_startup_port,
1178};
1179
1180static const struct mtk_pcie_soc mtk_pcie_soc_mt2712 = {
1181 .ops = &mtk_pcie_ops_v2,
1182 .startup = mtk_pcie_startup_port_v2,
1183 .setup_irq = mtk_pcie_setup_irq,
1184};
1185
1186static const struct mtk_pcie_soc mtk_pcie_soc_mt7622 = {
1187 .need_fix_class_id = true,
1188 .ops = &mtk_pcie_ops_v2,
1189 .startup = mtk_pcie_startup_port_v2,
1190 .setup_irq = mtk_pcie_setup_irq,
1191};
1192
1193static const struct mtk_pcie_soc mtk_pcie_soc_mt7629 = {
1194 .need_fix_class_id = true,
1195 .need_fix_device_id = true,
1196 .device_id = PCI_DEVICE_ID_MEDIATEK_7629,
1197 .ops = &mtk_pcie_ops_v2,
1198 .startup = mtk_pcie_startup_port_v2,
1199 .setup_irq = mtk_pcie_setup_irq,
1200};
1201
1202static const struct of_device_id mtk_pcie_ids[] = {
1203 { .compatible = "mediatek,mt2701-pcie", .data = &mtk_pcie_soc_v1 },
1204 { .compatible = "mediatek,mt7623-pcie", .data = &mtk_pcie_soc_v1 },
1205 { .compatible = "mediatek,mt2712-pcie", .data = &mtk_pcie_soc_mt2712 },
1206 { .compatible = "mediatek,mt7622-pcie", .data = &mtk_pcie_soc_mt7622 },
1207 { .compatible = "mediatek,mt7629-pcie", .data = &mtk_pcie_soc_mt7629 },
1208 {},
1209};
1210
1211static struct platform_driver mtk_pcie_driver = {
1212 .probe = mtk_pcie_probe,
1213 .remove = mtk_pcie_remove,
1214 .driver = {
1215 .name = "mtk-pcie",
1216 .of_match_table = mtk_pcie_ids,
1217 .suppress_bind_attrs = true,
1218 .pm = &mtk_pcie_pm_ops,
1219 },
1220};
1221module_platform_driver(mtk_pcie_driver);
1222MODULE_LICENSE("GPL v2");
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/msi.h>
18#include <linux/module.h>
19#include <linux/of_address.h>
20#include <linux/of_pci.h>
21#include <linux/of_platform.h>
22#include <linux/pci.h>
23#include <linux/phy/phy.h>
24#include <linux/platform_device.h>
25#include <linux/pm_runtime.h>
26#include <linux/reset.h>
27
28#include "../pci.h"
29
30/* PCIe shared registers */
31#define PCIE_SYS_CFG 0x00
32#define PCIE_INT_ENABLE 0x0c
33#define PCIE_CFG_ADDR 0x20
34#define PCIE_CFG_DATA 0x24
35
36/* PCIe per port registers */
37#define PCIE_BAR0_SETUP 0x10
38#define PCIE_CLASS 0x34
39#define PCIE_LINK_STATUS 0x50
40
41#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
42#define PCIE_PORT_PERST(x) BIT(1 + (x))
43#define PCIE_PORT_LINKUP BIT(0)
44#define PCIE_BAR_MAP_MAX GENMASK(31, 16)
45
46#define PCIE_BAR_ENABLE BIT(0)
47#define PCIE_REVISION_ID BIT(0)
48#define PCIE_CLASS_CODE (0x60400 << 8)
49#define PCIE_CONF_REG(regn) (((regn) & GENMASK(7, 2)) | \
50 ((((regn) >> 8) & GENMASK(3, 0)) << 24))
51#define PCIE_CONF_FUN(fun) (((fun) << 8) & GENMASK(10, 8))
52#define PCIE_CONF_DEV(dev) (((dev) << 11) & GENMASK(15, 11))
53#define PCIE_CONF_BUS(bus) (((bus) << 16) & GENMASK(23, 16))
54#define PCIE_CONF_ADDR(regn, fun, dev, bus) \
55 (PCIE_CONF_REG(regn) | PCIE_CONF_FUN(fun) | \
56 PCIE_CONF_DEV(dev) | PCIE_CONF_BUS(bus))
57
58/* MediaTek specific configuration registers */
59#define PCIE_FTS_NUM 0x70c
60#define PCIE_FTS_NUM_MASK GENMASK(15, 8)
61#define PCIE_FTS_NUM_L0(x) ((x) & 0xff << 8)
62
63#define PCIE_FC_CREDIT 0x73c
64#define PCIE_FC_CREDIT_MASK (GENMASK(31, 31) | GENMASK(28, 16))
65#define PCIE_FC_CREDIT_VAL(x) ((x) << 16)
66
67/* PCIe V2 share registers */
68#define PCIE_SYS_CFG_V2 0x0
69#define PCIE_CSR_LTSSM_EN(x) BIT(0 + (x) * 8)
70#define PCIE_CSR_ASPM_L1_EN(x) BIT(1 + (x) * 8)
71
72/* PCIe V2 per-port registers */
73#define PCIE_MSI_VECTOR 0x0c0
74
75#define PCIE_CONF_VEND_ID 0x100
76#define PCIE_CONF_DEVICE_ID 0x102
77#define PCIE_CONF_CLASS_ID 0x106
78
79#define PCIE_INT_MASK 0x420
80#define INTX_MASK GENMASK(19, 16)
81#define INTX_SHIFT 16
82#define PCIE_INT_STATUS 0x424
83#define MSI_STATUS BIT(23)
84#define PCIE_IMSI_STATUS 0x42c
85#define PCIE_IMSI_ADDR 0x430
86#define MSI_MASK BIT(23)
87#define MTK_MSI_IRQS_NUM 32
88
89#define PCIE_AHB_TRANS_BASE0_L 0x438
90#define PCIE_AHB_TRANS_BASE0_H 0x43c
91#define AHB2PCIE_SIZE(x) ((x) & GENMASK(4, 0))
92#define PCIE_AXI_WINDOW0 0x448
93#define WIN_ENABLE BIT(7)
94/*
95 * Define PCIe to AHB window size as 2^33 to support max 8GB address space
96 * translate, support least 4GB DRAM size access from EP DMA(physical DRAM
97 * start from 0x40000000).
98 */
99#define PCIE2AHB_SIZE 0x21
100
101/* PCIe V2 configuration transaction header */
102#define PCIE_CFG_HEADER0 0x460
103#define PCIE_CFG_HEADER1 0x464
104#define PCIE_CFG_HEADER2 0x468
105#define PCIE_CFG_WDATA 0x470
106#define PCIE_APP_TLP_REQ 0x488
107#define PCIE_CFG_RDATA 0x48c
108#define APP_CFG_REQ BIT(0)
109#define APP_CPL_STATUS GENMASK(7, 5)
110
111#define CFG_WRRD_TYPE_0 4
112#define CFG_WR_FMT 2
113#define CFG_RD_FMT 0
114
115#define CFG_DW0_LENGTH(length) ((length) & GENMASK(9, 0))
116#define CFG_DW0_TYPE(type) (((type) << 24) & GENMASK(28, 24))
117#define CFG_DW0_FMT(fmt) (((fmt) << 29) & GENMASK(31, 29))
118#define CFG_DW2_REGN(regn) ((regn) & GENMASK(11, 2))
119#define CFG_DW2_FUN(fun) (((fun) << 16) & GENMASK(18, 16))
120#define CFG_DW2_DEV(dev) (((dev) << 19) & GENMASK(23, 19))
121#define CFG_DW2_BUS(bus) (((bus) << 24) & GENMASK(31, 24))
122#define CFG_HEADER_DW0(type, fmt) \
123 (CFG_DW0_LENGTH(1) | CFG_DW0_TYPE(type) | CFG_DW0_FMT(fmt))
124#define CFG_HEADER_DW1(where, size) \
125 (GENMASK(((size) - 1), 0) << ((where) & 0x3))
126#define CFG_HEADER_DW2(regn, fun, dev, bus) \
127 (CFG_DW2_REGN(regn) | CFG_DW2_FUN(fun) | \
128 CFG_DW2_DEV(dev) | CFG_DW2_BUS(bus))
129
130#define PCIE_RST_CTRL 0x510
131#define PCIE_PHY_RSTB BIT(0)
132#define PCIE_PIPE_SRSTB BIT(1)
133#define PCIE_MAC_SRSTB BIT(2)
134#define PCIE_CRSTB BIT(3)
135#define PCIE_PERSTB BIT(8)
136#define PCIE_LINKDOWN_RST_EN GENMASK(15, 13)
137#define PCIE_LINK_STATUS_V2 0x804
138#define PCIE_PORT_LINKUP_V2 BIT(10)
139
140struct mtk_pcie_port;
141
142/**
143 * struct mtk_pcie_soc - differentiate between host generations
144 * @need_fix_class_id: whether this host's class ID needed to be fixed or not
145 * @need_fix_device_id: whether this host's device ID needed to be fixed or not
146 * @device_id: device ID which this host need to be fixed
147 * @ops: pointer to configuration access functions
148 * @startup: pointer to controller setting functions
149 * @setup_irq: pointer to initialize IRQ functions
150 */
151struct mtk_pcie_soc {
152 bool need_fix_class_id;
153 bool need_fix_device_id;
154 unsigned int device_id;
155 struct pci_ops *ops;
156 int (*startup)(struct mtk_pcie_port *port);
157 int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node);
158};
159
160/**
161 * struct mtk_pcie_port - PCIe port information
162 * @base: IO mapped register base
163 * @list: port list
164 * @pcie: pointer to PCIe host info
165 * @reset: pointer to port reset control
166 * @sys_ck: pointer to transaction/data link layer clock
167 * @ahb_ck: pointer to AHB slave interface operating clock for CSR access
168 * and RC initiated MMIO access
169 * @axi_ck: pointer to application layer MMIO channel operating clock
170 * @aux_ck: pointer to pe2_mac_bridge and pe2_mac_core operating clock
171 * when pcie_mac_ck/pcie_pipe_ck is turned off
172 * @obff_ck: pointer to OBFF functional block operating clock
173 * @pipe_ck: pointer to LTSSM and PHY/MAC layer operating clock
174 * @phy: pointer to PHY control block
175 * @slot: port slot
176 * @irq: GIC irq
177 * @irq_domain: legacy INTx IRQ domain
178 * @inner_domain: inner IRQ domain
179 * @msi_domain: MSI IRQ domain
180 * @lock: protect the msi_irq_in_use bitmap
181 * @msi_irq_in_use: bit map for assigned MSI IRQ
182 */
183struct mtk_pcie_port {
184 void __iomem *base;
185 struct list_head list;
186 struct mtk_pcie *pcie;
187 struct reset_control *reset;
188 struct clk *sys_ck;
189 struct clk *ahb_ck;
190 struct clk *axi_ck;
191 struct clk *aux_ck;
192 struct clk *obff_ck;
193 struct clk *pipe_ck;
194 struct phy *phy;
195 u32 slot;
196 int irq;
197 struct irq_domain *irq_domain;
198 struct irq_domain *inner_domain;
199 struct irq_domain *msi_domain;
200 struct mutex lock;
201 DECLARE_BITMAP(msi_irq_in_use, MTK_MSI_IRQS_NUM);
202};
203
204/**
205 * struct mtk_pcie - PCIe host information
206 * @dev: pointer to PCIe device
207 * @base: IO mapped register base
208 * @free_ck: free-run reference clock
209 * @mem: non-prefetchable memory resource
210 * @ports: pointer to PCIe port information
211 * @soc: pointer to SoC-dependent operations
212 * @busnr: root bus number
213 */
214struct mtk_pcie {
215 struct device *dev;
216 void __iomem *base;
217 struct clk *free_ck;
218
219 struct resource mem;
220 struct list_head ports;
221 const struct mtk_pcie_soc *soc;
222 unsigned int busnr;
223};
224
225static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie)
226{
227 struct device *dev = pcie->dev;
228
229 clk_disable_unprepare(pcie->free_ck);
230
231 pm_runtime_put_sync(dev);
232 pm_runtime_disable(dev);
233}
234
235static void mtk_pcie_port_free(struct mtk_pcie_port *port)
236{
237 struct mtk_pcie *pcie = port->pcie;
238 struct device *dev = pcie->dev;
239
240 devm_iounmap(dev, port->base);
241 list_del(&port->list);
242 devm_kfree(dev, port);
243}
244
245static void mtk_pcie_put_resources(struct mtk_pcie *pcie)
246{
247 struct mtk_pcie_port *port, *tmp;
248
249 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
250 phy_power_off(port->phy);
251 phy_exit(port->phy);
252 clk_disable_unprepare(port->pipe_ck);
253 clk_disable_unprepare(port->obff_ck);
254 clk_disable_unprepare(port->axi_ck);
255 clk_disable_unprepare(port->aux_ck);
256 clk_disable_unprepare(port->ahb_ck);
257 clk_disable_unprepare(port->sys_ck);
258 mtk_pcie_port_free(port);
259 }
260
261 mtk_pcie_subsys_powerdown(pcie);
262}
263
264static int mtk_pcie_check_cfg_cpld(struct mtk_pcie_port *port)
265{
266 u32 val;
267 int err;
268
269 err = readl_poll_timeout_atomic(port->base + PCIE_APP_TLP_REQ, val,
270 !(val & APP_CFG_REQ), 10,
271 100 * USEC_PER_MSEC);
272 if (err)
273 return PCIBIOS_SET_FAILED;
274
275 if (readl(port->base + PCIE_APP_TLP_REQ) & APP_CPL_STATUS)
276 return PCIBIOS_SET_FAILED;
277
278 return PCIBIOS_SUCCESSFUL;
279}
280
281static int mtk_pcie_hw_rd_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
282 int where, int size, u32 *val)
283{
284 u32 tmp;
285
286 /* Write PCIe configuration transaction header for Cfgrd */
287 writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_RD_FMT),
288 port->base + PCIE_CFG_HEADER0);
289 writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
290 writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_SLOT(devfn), bus),
291 port->base + PCIE_CFG_HEADER2);
292
293 /* Trigger h/w to transmit Cfgrd TLP */
294 tmp = readl(port->base + PCIE_APP_TLP_REQ);
295 tmp |= APP_CFG_REQ;
296 writel(tmp, port->base + PCIE_APP_TLP_REQ);
297
298 /* Check completion status */
299 if (mtk_pcie_check_cfg_cpld(port))
300 return PCIBIOS_SET_FAILED;
301
302 /* Read cpld payload of Cfgrd */
303 *val = readl(port->base + PCIE_CFG_RDATA);
304
305 if (size == 1)
306 *val = (*val >> (8 * (where & 3))) & 0xff;
307 else if (size == 2)
308 *val = (*val >> (8 * (where & 3))) & 0xffff;
309
310 return PCIBIOS_SUCCESSFUL;
311}
312
313static int mtk_pcie_hw_wr_cfg(struct mtk_pcie_port *port, u32 bus, u32 devfn,
314 int where, int size, u32 val)
315{
316 /* Write PCIe configuration transaction header for Cfgwr */
317 writel(CFG_HEADER_DW0(CFG_WRRD_TYPE_0, CFG_WR_FMT),
318 port->base + PCIE_CFG_HEADER0);
319 writel(CFG_HEADER_DW1(where, size), port->base + PCIE_CFG_HEADER1);
320 writel(CFG_HEADER_DW2(where, PCI_FUNC(devfn), PCI_SLOT(devfn), bus),
321 port->base + PCIE_CFG_HEADER2);
322
323 /* Write Cfgwr data */
324 val = val << 8 * (where & 3);
325 writel(val, port->base + PCIE_CFG_WDATA);
326
327 /* Trigger h/w to transmit Cfgwr TLP */
328 val = readl(port->base + PCIE_APP_TLP_REQ);
329 val |= APP_CFG_REQ;
330 writel(val, port->base + PCIE_APP_TLP_REQ);
331
332 /* Check completion status */
333 return mtk_pcie_check_cfg_cpld(port);
334}
335
336static struct mtk_pcie_port *mtk_pcie_find_port(struct pci_bus *bus,
337 unsigned int devfn)
338{
339 struct mtk_pcie *pcie = bus->sysdata;
340 struct mtk_pcie_port *port;
341 struct pci_dev *dev = NULL;
342
343 /*
344 * Walk the bus hierarchy to get the devfn value
345 * of the port in the root bus.
346 */
347 while (bus && bus->number) {
348 dev = bus->self;
349 bus = dev->bus;
350 devfn = dev->devfn;
351 }
352
353 list_for_each_entry(port, &pcie->ports, list)
354 if (port->slot == PCI_SLOT(devfn))
355 return port;
356
357 return NULL;
358}
359
360static int mtk_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
361 int where, int size, u32 *val)
362{
363 struct mtk_pcie_port *port;
364 u32 bn = bus->number;
365 int ret;
366
367 port = mtk_pcie_find_port(bus, devfn);
368 if (!port) {
369 *val = ~0;
370 return PCIBIOS_DEVICE_NOT_FOUND;
371 }
372
373 ret = mtk_pcie_hw_rd_cfg(port, bn, devfn, where, size, val);
374 if (ret)
375 *val = ~0;
376
377 return ret;
378}
379
380static int mtk_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
381 int where, int size, u32 val)
382{
383 struct mtk_pcie_port *port;
384 u32 bn = bus->number;
385
386 port = mtk_pcie_find_port(bus, devfn);
387 if (!port)
388 return PCIBIOS_DEVICE_NOT_FOUND;
389
390 return mtk_pcie_hw_wr_cfg(port, bn, devfn, where, size, val);
391}
392
393static struct pci_ops mtk_pcie_ops_v2 = {
394 .read = mtk_pcie_config_read,
395 .write = mtk_pcie_config_write,
396};
397
398static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
399{
400 struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
401 phys_addr_t addr;
402
403 /* MT2712/MT7622 only support 32-bit MSI addresses */
404 addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
405 msg->address_hi = 0;
406 msg->address_lo = lower_32_bits(addr);
407
408 msg->data = data->hwirq;
409
410 dev_dbg(port->pcie->dev, "msi#%d address_hi %#x address_lo %#x\n",
411 (int)data->hwirq, msg->address_hi, msg->address_lo);
412}
413
414static int mtk_msi_set_affinity(struct irq_data *irq_data,
415 const struct cpumask *mask, bool force)
416{
417 return -EINVAL;
418}
419
420static void mtk_msi_ack_irq(struct irq_data *data)
421{
422 struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
423 u32 hwirq = data->hwirq;
424
425 writel(1 << hwirq, port->base + PCIE_IMSI_STATUS);
426}
427
428static struct irq_chip mtk_msi_bottom_irq_chip = {
429 .name = "MTK MSI",
430 .irq_compose_msi_msg = mtk_compose_msi_msg,
431 .irq_set_affinity = mtk_msi_set_affinity,
432 .irq_ack = mtk_msi_ack_irq,
433};
434
435static int mtk_pcie_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
436 unsigned int nr_irqs, void *args)
437{
438 struct mtk_pcie_port *port = domain->host_data;
439 unsigned long bit;
440
441 WARN_ON(nr_irqs != 1);
442 mutex_lock(&port->lock);
443
444 bit = find_first_zero_bit(port->msi_irq_in_use, MTK_MSI_IRQS_NUM);
445 if (bit >= MTK_MSI_IRQS_NUM) {
446 mutex_unlock(&port->lock);
447 return -ENOSPC;
448 }
449
450 __set_bit(bit, port->msi_irq_in_use);
451
452 mutex_unlock(&port->lock);
453
454 irq_domain_set_info(domain, virq, bit, &mtk_msi_bottom_irq_chip,
455 domain->host_data, handle_edge_irq,
456 NULL, NULL);
457
458 return 0;
459}
460
461static void mtk_pcie_irq_domain_free(struct irq_domain *domain,
462 unsigned int virq, unsigned int nr_irqs)
463{
464 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
465 struct mtk_pcie_port *port = irq_data_get_irq_chip_data(d);
466
467 mutex_lock(&port->lock);
468
469 if (!test_bit(d->hwirq, port->msi_irq_in_use))
470 dev_err(port->pcie->dev, "trying to free unused MSI#%lu\n",
471 d->hwirq);
472 else
473 __clear_bit(d->hwirq, port->msi_irq_in_use);
474
475 mutex_unlock(&port->lock);
476
477 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
478}
479
480static const struct irq_domain_ops msi_domain_ops = {
481 .alloc = mtk_pcie_irq_domain_alloc,
482 .free = mtk_pcie_irq_domain_free,
483};
484
485static struct irq_chip mtk_msi_irq_chip = {
486 .name = "MTK PCIe MSI",
487 .irq_ack = irq_chip_ack_parent,
488 .irq_mask = pci_msi_mask_irq,
489 .irq_unmask = pci_msi_unmask_irq,
490};
491
492static struct msi_domain_info mtk_msi_domain_info = {
493 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
494 MSI_FLAG_PCI_MSIX),
495 .chip = &mtk_msi_irq_chip,
496};
497
498static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
499{
500 struct fwnode_handle *fwnode = of_node_to_fwnode(port->pcie->dev->of_node);
501
502 mutex_init(&port->lock);
503
504 port->inner_domain = irq_domain_create_linear(fwnode, MTK_MSI_IRQS_NUM,
505 &msi_domain_ops, port);
506 if (!port->inner_domain) {
507 dev_err(port->pcie->dev, "failed to create IRQ domain\n");
508 return -ENOMEM;
509 }
510
511 port->msi_domain = pci_msi_create_irq_domain(fwnode, &mtk_msi_domain_info,
512 port->inner_domain);
513 if (!port->msi_domain) {
514 dev_err(port->pcie->dev, "failed to create MSI domain\n");
515 irq_domain_remove(port->inner_domain);
516 return -ENOMEM;
517 }
518
519 return 0;
520}
521
522static void mtk_pcie_enable_msi(struct mtk_pcie_port *port)
523{
524 u32 val;
525 phys_addr_t msg_addr;
526
527 msg_addr = virt_to_phys(port->base + PCIE_MSI_VECTOR);
528 val = lower_32_bits(msg_addr);
529 writel(val, port->base + PCIE_IMSI_ADDR);
530
531 val = readl(port->base + PCIE_INT_MASK);
532 val &= ~MSI_MASK;
533 writel(val, port->base + PCIE_INT_MASK);
534}
535
536static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
537{
538 struct mtk_pcie_port *port, *tmp;
539
540 list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
541 irq_set_chained_handler_and_data(port->irq, NULL, NULL);
542
543 if (port->irq_domain)
544 irq_domain_remove(port->irq_domain);
545
546 if (IS_ENABLED(CONFIG_PCI_MSI)) {
547 if (port->msi_domain)
548 irq_domain_remove(port->msi_domain);
549 if (port->inner_domain)
550 irq_domain_remove(port->inner_domain);
551 }
552
553 irq_dispose_mapping(port->irq);
554 }
555}
556
557static int mtk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
558 irq_hw_number_t hwirq)
559{
560 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
561 irq_set_chip_data(irq, domain->host_data);
562
563 return 0;
564}
565
566static const struct irq_domain_ops intx_domain_ops = {
567 .map = mtk_pcie_intx_map,
568};
569
570static int mtk_pcie_init_irq_domain(struct mtk_pcie_port *port,
571 struct device_node *node)
572{
573 struct device *dev = port->pcie->dev;
574 struct device_node *pcie_intc_node;
575 int ret;
576
577 /* Setup INTx */
578 pcie_intc_node = of_get_next_child(node, NULL);
579 if (!pcie_intc_node) {
580 dev_err(dev, "no PCIe Intc node found\n");
581 return -ENODEV;
582 }
583
584 port->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
585 &intx_domain_ops, port);
586 of_node_put(pcie_intc_node);
587 if (!port->irq_domain) {
588 dev_err(dev, "failed to get INTx IRQ domain\n");
589 return -ENODEV;
590 }
591
592 if (IS_ENABLED(CONFIG_PCI_MSI)) {
593 ret = mtk_pcie_allocate_msi_domains(port);
594 if (ret)
595 return ret;
596 }
597
598 return 0;
599}
600
601static void mtk_pcie_intr_handler(struct irq_desc *desc)
602{
603 struct mtk_pcie_port *port = irq_desc_get_handler_data(desc);
604 struct irq_chip *irqchip = irq_desc_get_chip(desc);
605 unsigned long status;
606 u32 virq;
607 u32 bit = INTX_SHIFT;
608
609 chained_irq_enter(irqchip, desc);
610
611 status = readl(port->base + PCIE_INT_STATUS);
612 if (status & INTX_MASK) {
613 for_each_set_bit_from(bit, &status, PCI_NUM_INTX + INTX_SHIFT) {
614 /* Clear the INTx */
615 writel(1 << bit, port->base + PCIE_INT_STATUS);
616 virq = irq_find_mapping(port->irq_domain,
617 bit - INTX_SHIFT);
618 generic_handle_irq(virq);
619 }
620 }
621
622 if (IS_ENABLED(CONFIG_PCI_MSI)) {
623 if (status & MSI_STATUS){
624 unsigned long imsi_status;
625
626 while ((imsi_status = readl(port->base + PCIE_IMSI_STATUS))) {
627 for_each_set_bit(bit, &imsi_status, MTK_MSI_IRQS_NUM) {
628 virq = irq_find_mapping(port->inner_domain, bit);
629 generic_handle_irq(virq);
630 }
631 }
632 /* Clear MSI interrupt status */
633 writel(MSI_STATUS, port->base + PCIE_INT_STATUS);
634 }
635 }
636
637 chained_irq_exit(irqchip, desc);
638}
639
640static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
641 struct device_node *node)
642{
643 struct mtk_pcie *pcie = port->pcie;
644 struct device *dev = pcie->dev;
645 struct platform_device *pdev = to_platform_device(dev);
646 int err;
647
648 err = mtk_pcie_init_irq_domain(port, node);
649 if (err) {
650 dev_err(dev, "failed to init PCIe IRQ domain\n");
651 return err;
652 }
653
654 port->irq = platform_get_irq(pdev, port->slot);
655 irq_set_chained_handler_and_data(port->irq,
656 mtk_pcie_intr_handler, port);
657
658 return 0;
659}
660
661static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
662{
663 struct mtk_pcie *pcie = port->pcie;
664 struct resource *mem = &pcie->mem;
665 const struct mtk_pcie_soc *soc = port->pcie->soc;
666 u32 val;
667 int err;
668
669 /* MT7622 platforms need to enable LTSSM and ASPM from PCIe subsys */
670 if (pcie->base) {
671 val = readl(pcie->base + PCIE_SYS_CFG_V2);
672 val |= PCIE_CSR_LTSSM_EN(port->slot) |
673 PCIE_CSR_ASPM_L1_EN(port->slot);
674 writel(val, pcie->base + PCIE_SYS_CFG_V2);
675 }
676
677 /* Assert all reset signals */
678 writel(0, port->base + PCIE_RST_CTRL);
679
680 /*
681 * Enable PCIe link down reset, if link status changed from link up to
682 * link down, this will reset MAC control registers and configuration
683 * space.
684 */
685 writel(PCIE_LINKDOWN_RST_EN, port->base + PCIE_RST_CTRL);
686
687 /* De-assert PHY, PE, PIPE, MAC and configuration reset */
688 val = readl(port->base + PCIE_RST_CTRL);
689 val |= PCIE_PHY_RSTB | PCIE_PERSTB | PCIE_PIPE_SRSTB |
690 PCIE_MAC_SRSTB | PCIE_CRSTB;
691 writel(val, port->base + PCIE_RST_CTRL);
692
693 /* Set up vendor ID and class code */
694 if (soc->need_fix_class_id) {
695 val = PCI_VENDOR_ID_MEDIATEK;
696 writew(val, port->base + PCIE_CONF_VEND_ID);
697
698 val = PCI_CLASS_BRIDGE_PCI;
699 writew(val, port->base + PCIE_CONF_CLASS_ID);
700 }
701
702 if (soc->need_fix_device_id)
703 writew(soc->device_id, port->base + PCIE_CONF_DEVICE_ID);
704
705 /* 100ms timeout value should be enough for Gen1/2 training */
706 err = readl_poll_timeout(port->base + PCIE_LINK_STATUS_V2, val,
707 !!(val & PCIE_PORT_LINKUP_V2), 20,
708 100 * USEC_PER_MSEC);
709 if (err)
710 return -ETIMEDOUT;
711
712 /* Set INTx mask */
713 val = readl(port->base + PCIE_INT_MASK);
714 val &= ~INTX_MASK;
715 writel(val, port->base + PCIE_INT_MASK);
716
717 if (IS_ENABLED(CONFIG_PCI_MSI))
718 mtk_pcie_enable_msi(port);
719
720 /* Set AHB to PCIe translation windows */
721 val = lower_32_bits(mem->start) |
722 AHB2PCIE_SIZE(fls(resource_size(mem)));
723 writel(val, port->base + PCIE_AHB_TRANS_BASE0_L);
724
725 val = upper_32_bits(mem->start);
726 writel(val, port->base + PCIE_AHB_TRANS_BASE0_H);
727
728 /* Set PCIe to AXI translation memory space.*/
729 val = PCIE2AHB_SIZE | WIN_ENABLE;
730 writel(val, port->base + PCIE_AXI_WINDOW0);
731
732 return 0;
733}
734
735static void __iomem *mtk_pcie_map_bus(struct pci_bus *bus,
736 unsigned int devfn, int where)
737{
738 struct mtk_pcie *pcie = bus->sysdata;
739
740 writel(PCIE_CONF_ADDR(where, PCI_FUNC(devfn), PCI_SLOT(devfn),
741 bus->number), pcie->base + PCIE_CFG_ADDR);
742
743 return pcie->base + PCIE_CFG_DATA + (where & 3);
744}
745
746static struct pci_ops mtk_pcie_ops = {
747 .map_bus = mtk_pcie_map_bus,
748 .read = pci_generic_config_read,
749 .write = pci_generic_config_write,
750};
751
752static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
753{
754 struct mtk_pcie *pcie = port->pcie;
755 u32 func = PCI_FUNC(port->slot << 3);
756 u32 slot = PCI_SLOT(port->slot << 3);
757 u32 val;
758 int err;
759
760 /* assert port PERST_N */
761 val = readl(pcie->base + PCIE_SYS_CFG);
762 val |= PCIE_PORT_PERST(port->slot);
763 writel(val, pcie->base + PCIE_SYS_CFG);
764
765 /* de-assert port PERST_N */
766 val = readl(pcie->base + PCIE_SYS_CFG);
767 val &= ~PCIE_PORT_PERST(port->slot);
768 writel(val, pcie->base + PCIE_SYS_CFG);
769
770 /* 100ms timeout value should be enough for Gen1/2 training */
771 err = readl_poll_timeout(port->base + PCIE_LINK_STATUS, val,
772 !!(val & PCIE_PORT_LINKUP), 20,
773 100 * USEC_PER_MSEC);
774 if (err)
775 return -ETIMEDOUT;
776
777 /* enable interrupt */
778 val = readl(pcie->base + PCIE_INT_ENABLE);
779 val |= PCIE_PORT_INT_EN(port->slot);
780 writel(val, pcie->base + PCIE_INT_ENABLE);
781
782 /* map to all DDR region. We need to set it before cfg operation. */
783 writel(PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
784 port->base + PCIE_BAR0_SETUP);
785
786 /* configure class code and revision ID */
787 writel(PCIE_CLASS_CODE | PCIE_REVISION_ID, port->base + PCIE_CLASS);
788
789 /* configure FC credit */
790 writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
791 pcie->base + PCIE_CFG_ADDR);
792 val = readl(pcie->base + PCIE_CFG_DATA);
793 val &= ~PCIE_FC_CREDIT_MASK;
794 val |= PCIE_FC_CREDIT_VAL(0x806c);
795 writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
796 pcie->base + PCIE_CFG_ADDR);
797 writel(val, pcie->base + PCIE_CFG_DATA);
798
799 /* configure RC FTS number to 250 when it leaves L0s */
800 writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
801 pcie->base + PCIE_CFG_ADDR);
802 val = readl(pcie->base + PCIE_CFG_DATA);
803 val &= ~PCIE_FTS_NUM_MASK;
804 val |= PCIE_FTS_NUM_L0(0x50);
805 writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
806 pcie->base + PCIE_CFG_ADDR);
807 writel(val, pcie->base + PCIE_CFG_DATA);
808
809 return 0;
810}
811
812static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
813{
814 struct mtk_pcie *pcie = port->pcie;
815 struct device *dev = pcie->dev;
816 int err;
817
818 err = clk_prepare_enable(port->sys_ck);
819 if (err) {
820 dev_err(dev, "failed to enable sys_ck%d clock\n", port->slot);
821 goto err_sys_clk;
822 }
823
824 err = clk_prepare_enable(port->ahb_ck);
825 if (err) {
826 dev_err(dev, "failed to enable ahb_ck%d\n", port->slot);
827 goto err_ahb_clk;
828 }
829
830 err = clk_prepare_enable(port->aux_ck);
831 if (err) {
832 dev_err(dev, "failed to enable aux_ck%d\n", port->slot);
833 goto err_aux_clk;
834 }
835
836 err = clk_prepare_enable(port->axi_ck);
837 if (err) {
838 dev_err(dev, "failed to enable axi_ck%d\n", port->slot);
839 goto err_axi_clk;
840 }
841
842 err = clk_prepare_enable(port->obff_ck);
843 if (err) {
844 dev_err(dev, "failed to enable obff_ck%d\n", port->slot);
845 goto err_obff_clk;
846 }
847
848 err = clk_prepare_enable(port->pipe_ck);
849 if (err) {
850 dev_err(dev, "failed to enable pipe_ck%d\n", port->slot);
851 goto err_pipe_clk;
852 }
853
854 reset_control_assert(port->reset);
855 reset_control_deassert(port->reset);
856
857 err = phy_init(port->phy);
858 if (err) {
859 dev_err(dev, "failed to initialize port%d phy\n", port->slot);
860 goto err_phy_init;
861 }
862
863 err = phy_power_on(port->phy);
864 if (err) {
865 dev_err(dev, "failed to power on port%d phy\n", port->slot);
866 goto err_phy_on;
867 }
868
869 if (!pcie->soc->startup(port))
870 return;
871
872 dev_info(dev, "Port%d link down\n", port->slot);
873
874 phy_power_off(port->phy);
875err_phy_on:
876 phy_exit(port->phy);
877err_phy_init:
878 clk_disable_unprepare(port->pipe_ck);
879err_pipe_clk:
880 clk_disable_unprepare(port->obff_ck);
881err_obff_clk:
882 clk_disable_unprepare(port->axi_ck);
883err_axi_clk:
884 clk_disable_unprepare(port->aux_ck);
885err_aux_clk:
886 clk_disable_unprepare(port->ahb_ck);
887err_ahb_clk:
888 clk_disable_unprepare(port->sys_ck);
889err_sys_clk:
890 mtk_pcie_port_free(port);
891}
892
893static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
894 struct device_node *node,
895 int slot)
896{
897 struct mtk_pcie_port *port;
898 struct resource *regs;
899 struct device *dev = pcie->dev;
900 struct platform_device *pdev = to_platform_device(dev);
901 char name[10];
902 int err;
903
904 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
905 if (!port)
906 return -ENOMEM;
907
908 snprintf(name, sizeof(name), "port%d", slot);
909 regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
910 port->base = devm_ioremap_resource(dev, regs);
911 if (IS_ERR(port->base)) {
912 dev_err(dev, "failed to map port%d base\n", slot);
913 return PTR_ERR(port->base);
914 }
915
916 snprintf(name, sizeof(name), "sys_ck%d", slot);
917 port->sys_ck = devm_clk_get(dev, name);
918 if (IS_ERR(port->sys_ck)) {
919 dev_err(dev, "failed to get sys_ck%d clock\n", slot);
920 return PTR_ERR(port->sys_ck);
921 }
922
923 /* sys_ck might be divided into the following parts in some chips */
924 snprintf(name, sizeof(name), "ahb_ck%d", slot);
925 port->ahb_ck = devm_clk_get_optional(dev, name);
926 if (IS_ERR(port->ahb_ck))
927 return PTR_ERR(port->ahb_ck);
928
929 snprintf(name, sizeof(name), "axi_ck%d", slot);
930 port->axi_ck = devm_clk_get_optional(dev, name);
931 if (IS_ERR(port->axi_ck))
932 return PTR_ERR(port->axi_ck);
933
934 snprintf(name, sizeof(name), "aux_ck%d", slot);
935 port->aux_ck = devm_clk_get_optional(dev, name);
936 if (IS_ERR(port->aux_ck))
937 return PTR_ERR(port->aux_ck);
938
939 snprintf(name, sizeof(name), "obff_ck%d", slot);
940 port->obff_ck = devm_clk_get_optional(dev, name);
941 if (IS_ERR(port->obff_ck))
942 return PTR_ERR(port->obff_ck);
943
944 snprintf(name, sizeof(name), "pipe_ck%d", slot);
945 port->pipe_ck = devm_clk_get_optional(dev, name);
946 if (IS_ERR(port->pipe_ck))
947 return PTR_ERR(port->pipe_ck);
948
949 snprintf(name, sizeof(name), "pcie-rst%d", slot);
950 port->reset = devm_reset_control_get_optional_exclusive(dev, name);
951 if (PTR_ERR(port->reset) == -EPROBE_DEFER)
952 return PTR_ERR(port->reset);
953
954 /* some platforms may use default PHY setting */
955 snprintf(name, sizeof(name), "pcie-phy%d", slot);
956 port->phy = devm_phy_optional_get(dev, name);
957 if (IS_ERR(port->phy))
958 return PTR_ERR(port->phy);
959
960 port->slot = slot;
961 port->pcie = pcie;
962
963 if (pcie->soc->setup_irq) {
964 err = pcie->soc->setup_irq(port, node);
965 if (err)
966 return err;
967 }
968
969 INIT_LIST_HEAD(&port->list);
970 list_add_tail(&port->list, &pcie->ports);
971
972 return 0;
973}
974
975static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
976{
977 struct device *dev = pcie->dev;
978 struct platform_device *pdev = to_platform_device(dev);
979 struct resource *regs;
980 int err;
981
982 /* get shared registers, which are optional */
983 regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "subsys");
984 if (regs) {
985 pcie->base = devm_ioremap_resource(dev, regs);
986 if (IS_ERR(pcie->base)) {
987 dev_err(dev, "failed to map shared register\n");
988 return PTR_ERR(pcie->base);
989 }
990 }
991
992 pcie->free_ck = devm_clk_get(dev, "free_ck");
993 if (IS_ERR(pcie->free_ck)) {
994 if (PTR_ERR(pcie->free_ck) == -EPROBE_DEFER)
995 return -EPROBE_DEFER;
996
997 pcie->free_ck = NULL;
998 }
999
1000 pm_runtime_enable(dev);
1001 pm_runtime_get_sync(dev);
1002
1003 /* enable top level clock */
1004 err = clk_prepare_enable(pcie->free_ck);
1005 if (err) {
1006 dev_err(dev, "failed to enable free_ck\n");
1007 goto err_free_ck;
1008 }
1009
1010 return 0;
1011
1012err_free_ck:
1013 pm_runtime_put_sync(dev);
1014 pm_runtime_disable(dev);
1015
1016 return err;
1017}
1018
1019static int mtk_pcie_setup(struct mtk_pcie *pcie)
1020{
1021 struct device *dev = pcie->dev;
1022 struct device_node *node = dev->of_node, *child;
1023 struct mtk_pcie_port *port, *tmp;
1024 struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
1025 struct list_head *windows = &host->windows;
1026 struct resource_entry *win, *tmp_win;
1027 resource_size_t io_base;
1028 int err;
1029
1030 err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
1031 windows, &io_base);
1032 if (err)
1033 return err;
1034
1035 err = devm_request_pci_bus_resources(dev, windows);
1036 if (err < 0)
1037 return err;
1038
1039 /* Get the I/O and memory ranges from DT */
1040 resource_list_for_each_entry_safe(win, tmp_win, windows) {
1041 switch (resource_type(win->res)) {
1042 case IORESOURCE_IO:
1043 err = devm_pci_remap_iospace(dev, win->res, io_base);
1044 if (err) {
1045 dev_warn(dev, "error %d: failed to map resource %pR\n",
1046 err, win->res);
1047 resource_list_destroy_entry(win);
1048 }
1049 break;
1050 case IORESOURCE_MEM:
1051 memcpy(&pcie->mem, win->res, sizeof(*win->res));
1052 pcie->mem.name = "non-prefetchable";
1053 break;
1054 case IORESOURCE_BUS:
1055 pcie->busnr = win->res->start;
1056 break;
1057 }
1058 }
1059
1060 for_each_available_child_of_node(node, child) {
1061 int slot;
1062
1063 err = of_pci_get_devfn(child);
1064 if (err < 0) {
1065 dev_err(dev, "failed to parse devfn: %d\n", err);
1066 return err;
1067 }
1068
1069 slot = PCI_SLOT(err);
1070
1071 err = mtk_pcie_parse_port(pcie, child, slot);
1072 if (err)
1073 return err;
1074 }
1075
1076 err = mtk_pcie_subsys_powerup(pcie);
1077 if (err)
1078 return err;
1079
1080 /* enable each port, and then check link status */
1081 list_for_each_entry_safe(port, tmp, &pcie->ports, list)
1082 mtk_pcie_enable_port(port);
1083
1084 /* power down PCIe subsys if slots are all empty (link down) */
1085 if (list_empty(&pcie->ports))
1086 mtk_pcie_subsys_powerdown(pcie);
1087
1088 return 0;
1089}
1090
1091static int mtk_pcie_probe(struct platform_device *pdev)
1092{
1093 struct device *dev = &pdev->dev;
1094 struct mtk_pcie *pcie;
1095 struct pci_host_bridge *host;
1096 int err;
1097
1098 host = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
1099 if (!host)
1100 return -ENOMEM;
1101
1102 pcie = pci_host_bridge_priv(host);
1103
1104 pcie->dev = dev;
1105 pcie->soc = of_device_get_match_data(dev);
1106 platform_set_drvdata(pdev, pcie);
1107 INIT_LIST_HEAD(&pcie->ports);
1108
1109 err = mtk_pcie_setup(pcie);
1110 if (err)
1111 return err;
1112
1113 host->busnr = pcie->busnr;
1114 host->dev.parent = pcie->dev;
1115 host->ops = pcie->soc->ops;
1116 host->map_irq = of_irq_parse_and_map_pci;
1117 host->swizzle_irq = pci_common_swizzle;
1118 host->sysdata = pcie;
1119
1120 err = pci_host_probe(host);
1121 if (err)
1122 goto put_resources;
1123
1124 return 0;
1125
1126put_resources:
1127 if (!list_empty(&pcie->ports))
1128 mtk_pcie_put_resources(pcie);
1129
1130 return err;
1131}
1132
1133
1134static void mtk_pcie_free_resources(struct mtk_pcie *pcie)
1135{
1136 struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
1137 struct list_head *windows = &host->windows;
1138
1139 pci_free_resource_list(windows);
1140}
1141
1142static int mtk_pcie_remove(struct platform_device *pdev)
1143{
1144 struct mtk_pcie *pcie = platform_get_drvdata(pdev);
1145 struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
1146
1147 pci_stop_root_bus(host->bus);
1148 pci_remove_root_bus(host->bus);
1149 mtk_pcie_free_resources(pcie);
1150
1151 mtk_pcie_irq_teardown(pcie);
1152
1153 mtk_pcie_put_resources(pcie);
1154
1155 return 0;
1156}
1157
1158static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev)
1159{
1160 struct mtk_pcie *pcie = dev_get_drvdata(dev);
1161 struct mtk_pcie_port *port;
1162
1163 if (list_empty(&pcie->ports))
1164 return 0;
1165
1166 list_for_each_entry(port, &pcie->ports, list) {
1167 clk_disable_unprepare(port->pipe_ck);
1168 clk_disable_unprepare(port->obff_ck);
1169 clk_disable_unprepare(port->axi_ck);
1170 clk_disable_unprepare(port->aux_ck);
1171 clk_disable_unprepare(port->ahb_ck);
1172 clk_disable_unprepare(port->sys_ck);
1173 phy_power_off(port->phy);
1174 phy_exit(port->phy);
1175 }
1176
1177 clk_disable_unprepare(pcie->free_ck);
1178
1179 return 0;
1180}
1181
1182static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
1183{
1184 struct mtk_pcie *pcie = dev_get_drvdata(dev);
1185 struct mtk_pcie_port *port, *tmp;
1186
1187 if (list_empty(&pcie->ports))
1188 return 0;
1189
1190 clk_prepare_enable(pcie->free_ck);
1191
1192 list_for_each_entry_safe(port, tmp, &pcie->ports, list)
1193 mtk_pcie_enable_port(port);
1194
1195 /* In case of EP was removed while system suspend. */
1196 if (list_empty(&pcie->ports))
1197 clk_disable_unprepare(pcie->free_ck);
1198
1199 return 0;
1200}
1201
1202static const struct dev_pm_ops mtk_pcie_pm_ops = {
1203 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq,
1204 mtk_pcie_resume_noirq)
1205};
1206
1207static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
1208 .ops = &mtk_pcie_ops,
1209 .startup = mtk_pcie_startup_port,
1210};
1211
1212static const struct mtk_pcie_soc mtk_pcie_soc_mt2712 = {
1213 .ops = &mtk_pcie_ops_v2,
1214 .startup = mtk_pcie_startup_port_v2,
1215 .setup_irq = mtk_pcie_setup_irq,
1216};
1217
1218static const struct mtk_pcie_soc mtk_pcie_soc_mt7622 = {
1219 .need_fix_class_id = true,
1220 .ops = &mtk_pcie_ops_v2,
1221 .startup = mtk_pcie_startup_port_v2,
1222 .setup_irq = mtk_pcie_setup_irq,
1223};
1224
1225static const struct mtk_pcie_soc mtk_pcie_soc_mt7629 = {
1226 .need_fix_class_id = true,
1227 .need_fix_device_id = true,
1228 .device_id = PCI_DEVICE_ID_MEDIATEK_7629,
1229 .ops = &mtk_pcie_ops_v2,
1230 .startup = mtk_pcie_startup_port_v2,
1231 .setup_irq = mtk_pcie_setup_irq,
1232};
1233
1234static const struct of_device_id mtk_pcie_ids[] = {
1235 { .compatible = "mediatek,mt2701-pcie", .data = &mtk_pcie_soc_v1 },
1236 { .compatible = "mediatek,mt7623-pcie", .data = &mtk_pcie_soc_v1 },
1237 { .compatible = "mediatek,mt2712-pcie", .data = &mtk_pcie_soc_mt2712 },
1238 { .compatible = "mediatek,mt7622-pcie", .data = &mtk_pcie_soc_mt7622 },
1239 { .compatible = "mediatek,mt7629-pcie", .data = &mtk_pcie_soc_mt7629 },
1240 {},
1241};
1242
1243static struct platform_driver mtk_pcie_driver = {
1244 .probe = mtk_pcie_probe,
1245 .remove = mtk_pcie_remove,
1246 .driver = {
1247 .name = "mtk-pcie",
1248 .of_match_table = mtk_pcie_ids,
1249 .suppress_bind_attrs = true,
1250 .pm = &mtk_pcie_pm_ops,
1251 },
1252};
1253module_platform_driver(mtk_pcie_driver);
1254MODULE_LICENSE("GPL v2");