1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Rockchip AXI PCIe host controller driver
4 *
5 * Copyright (c) 2016 Rockchip, Inc.
6 *
7 * Author: Shawn Lin <shawn.lin@rock-chips.com>
8 * Wenrui Li <wenrui.li@rock-chips.com>
9 *
10 * Bits taken from Synopsys DesignWare Host controller driver and
11 * ARM PCI Host generic driver.
12 */
13
14 #include <linux/bitrev.h>
15 #include <linux/clk.h>
16 #include <linux/delay.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/iopoll.h>
21 #include <linux/irq.h>
22 #include <linux/irqchip/chained_irq.h>
23 #include <linux/irqdomain.h>
24 #include <linux/kernel.h>
25 #include <linux/mfd/syscon.h>
26 #include <linux/module.h>
27 #include <linux/of_address.h>
28 #include <linux/of_device.h>
29 #include <linux/of_pci.h>
30 #include <linux/of_platform.h>
31 #include <linux/of_irq.h>
32 #include <linux/pci.h>
33 #include <linux/pci_ids.h>
34 #include <linux/phy/phy.h>
35 #include <linux/platform_device.h>
36 #include <linux/reset.h>
37 #include <linux/regmap.h>
38
39 #include "../pci.h"
40 #include "pcie-rockchip.h"
41
rockchip_pcie_enable_bw_int(struct rockchip_pcie * rockchip)42 static void rockchip_pcie_enable_bw_int(struct rockchip_pcie *rockchip)
43 {
44 u32 status;
45
46 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
47 status |= (PCI_EXP_LNKCTL_LBMIE | PCI_EXP_LNKCTL_LABIE);
48 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
49 }
50
rockchip_pcie_clr_bw_int(struct rockchip_pcie * rockchip)51 static void rockchip_pcie_clr_bw_int(struct rockchip_pcie *rockchip)
52 {
53 u32 status;
54
55 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
56 status |= (PCI_EXP_LNKSTA_LBMS | PCI_EXP_LNKSTA_LABS) << 16;
57 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
58 }
59
rockchip_pcie_update_txcredit_mui(struct rockchip_pcie * rockchip)60 static void rockchip_pcie_update_txcredit_mui(struct rockchip_pcie *rockchip)
61 {
62 u32 val;
63
64 /* Update Tx credit maximum update interval */
65 val = rockchip_pcie_read(rockchip, PCIE_CORE_TXCREDIT_CFG1);
66 val &= ~PCIE_CORE_TXCREDIT_CFG1_MUI_MASK;
67 val |= PCIE_CORE_TXCREDIT_CFG1_MUI_ENCODE(24000); /* ns */
68 rockchip_pcie_write(rockchip, val, PCIE_CORE_TXCREDIT_CFG1);
69 }
70
rockchip_pcie_valid_device(struct rockchip_pcie * rockchip,struct pci_bus * bus,int dev)71 static int rockchip_pcie_valid_device(struct rockchip_pcie *rockchip,
72 struct pci_bus *bus, int dev)
73 {
74 /*
75 * Access only one slot on each root port.
76 * Do not read more than one device on the bus directly attached
77 * to RC's downstream side.
78 */
79 if (pci_is_root_bus(bus) || pci_is_root_bus(bus->parent))
80 return dev == 0;
81
82 return 1;
83 }
84
rockchip_pcie_lane_map(struct rockchip_pcie * rockchip)85 static u8 rockchip_pcie_lane_map(struct rockchip_pcie *rockchip)
86 {
87 u32 val;
88 u8 map;
89
90 if (rockchip->legacy_phy)
91 return GENMASK(MAX_LANE_NUM - 1, 0);
92
93 val = rockchip_pcie_read(rockchip, PCIE_CORE_LANE_MAP);
94 map = val & PCIE_CORE_LANE_MAP_MASK;
95
96 /* The link may be using a reverse-indexed mapping. */
97 if (val & PCIE_CORE_LANE_MAP_REVERSE)
98 map = bitrev8(map) >> 4;
99
100 return map;
101 }
102
rockchip_pcie_rd_own_conf(struct rockchip_pcie * rockchip,int where,int size,u32 * val)103 static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip,
104 int where, int size, u32 *val)
105 {
106 void __iomem *addr;
107
108 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + where;
109
110 if (!IS_ALIGNED((uintptr_t)addr, size)) {
111 *val = 0;
112 return PCIBIOS_BAD_REGISTER_NUMBER;
113 }
114
115 if (size == 4) {
116 *val = readl(addr);
117 } else if (size == 2) {
118 *val = readw(addr);
119 } else if (size == 1) {
120 *val = readb(addr);
121 } else {
122 *val = 0;
123 return PCIBIOS_BAD_REGISTER_NUMBER;
124 }
125 return PCIBIOS_SUCCESSFUL;
126 }
127
rockchip_pcie_wr_own_conf(struct rockchip_pcie * rockchip,int where,int size,u32 val)128 static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip,
129 int where, int size, u32 val)
130 {
131 u32 mask, tmp, offset;
132 void __iomem *addr;
133
134 offset = where & ~0x3;
135 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + offset;
136
137 if (size == 4) {
138 writel(val, addr);
139 return PCIBIOS_SUCCESSFUL;
140 }
141
142 mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));
143
144 /*
145 * N.B. This read/modify/write isn't safe in general because it can
146 * corrupt RW1C bits in adjacent registers. But the hardware
147 * doesn't support smaller writes.
148 */
149 tmp = readl(addr) & mask;
150 tmp |= val << ((where & 0x3) * 8);
151 writel(tmp, addr);
152
153 return PCIBIOS_SUCCESSFUL;
154 }
155
rockchip_pcie_rd_other_conf(struct rockchip_pcie * rockchip,struct pci_bus * bus,u32 devfn,int where,int size,u32 * val)156 static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip,
157 struct pci_bus *bus, u32 devfn,
158 int where, int size, u32 *val)
159 {
160 void __iomem *addr;
161
162 addr = rockchip->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
163
164 if (!IS_ALIGNED((uintptr_t)addr, size)) {
165 *val = 0;
166 return PCIBIOS_BAD_REGISTER_NUMBER;
167 }
168
169 if (pci_is_root_bus(bus->parent))
170 rockchip_pcie_cfg_configuration_accesses(rockchip,
171 AXI_WRAPPER_TYPE0_CFG);
172 else
173 rockchip_pcie_cfg_configuration_accesses(rockchip,
174 AXI_WRAPPER_TYPE1_CFG);
175
176 if (size == 4) {
177 *val = readl(addr);
178 } else if (size == 2) {
179 *val = readw(addr);
180 } else if (size == 1) {
181 *val = readb(addr);
182 } else {
183 *val = 0;
184 return PCIBIOS_BAD_REGISTER_NUMBER;
185 }
186 return PCIBIOS_SUCCESSFUL;
187 }
188
rockchip_pcie_wr_other_conf(struct rockchip_pcie * rockchip,struct pci_bus * bus,u32 devfn,int where,int size,u32 val)189 static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip,
190 struct pci_bus *bus, u32 devfn,
191 int where, int size, u32 val)
192 {
193 void __iomem *addr;
194
195 addr = rockchip->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
196
197 if (!IS_ALIGNED((uintptr_t)addr, size))
198 return PCIBIOS_BAD_REGISTER_NUMBER;
199
200 if (pci_is_root_bus(bus->parent))
201 rockchip_pcie_cfg_configuration_accesses(rockchip,
202 AXI_WRAPPER_TYPE0_CFG);
203 else
204 rockchip_pcie_cfg_configuration_accesses(rockchip,
205 AXI_WRAPPER_TYPE1_CFG);
206
207 if (size == 4)
208 writel(val, addr);
209 else if (size == 2)
210 writew(val, addr);
211 else if (size == 1)
212 writeb(val, addr);
213 else
214 return PCIBIOS_BAD_REGISTER_NUMBER;
215
216 return PCIBIOS_SUCCESSFUL;
217 }
218
rockchip_pcie_rd_conf(struct pci_bus * bus,u32 devfn,int where,int size,u32 * val)219 static int rockchip_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
220 int size, u32 *val)
221 {
222 struct rockchip_pcie *rockchip = bus->sysdata;
223
224 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn)))
225 return PCIBIOS_DEVICE_NOT_FOUND;
226
227 if (pci_is_root_bus(bus))
228 return rockchip_pcie_rd_own_conf(rockchip, where, size, val);
229
230 return rockchip_pcie_rd_other_conf(rockchip, bus, devfn, where, size,
231 val);
232 }
233
rockchip_pcie_wr_conf(struct pci_bus * bus,u32 devfn,int where,int size,u32 val)234 static int rockchip_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
235 int where, int size, u32 val)
236 {
237 struct rockchip_pcie *rockchip = bus->sysdata;
238
239 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn)))
240 return PCIBIOS_DEVICE_NOT_FOUND;
241
242 if (pci_is_root_bus(bus))
243 return rockchip_pcie_wr_own_conf(rockchip, where, size, val);
244
245 return rockchip_pcie_wr_other_conf(rockchip, bus, devfn, where, size,
246 val);
247 }
248
249 static struct pci_ops rockchip_pcie_ops = {
250 .read = rockchip_pcie_rd_conf,
251 .write = rockchip_pcie_wr_conf,
252 };
253
rockchip_pcie_set_power_limit(struct rockchip_pcie * rockchip)254 static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
255 {
256 int curr;
257 u32 status, scale, power;
258
259 if (IS_ERR(rockchip->vpcie3v3))
260 return;
261
262 /*
263 * Set RC's captured slot power limit and scale if
264 * vpcie3v3 available. The default values are both zero
265 * which means the software should set these two according
266 * to the actual power supply.
267 */
268 curr = regulator_get_current_limit(rockchip->vpcie3v3);
269 if (curr <= 0)
270 return;
271
272 scale = 3; /* 0.001x */
273 curr = curr / 1000; /* convert to mA */
274 power = (curr * 3300) / 1000; /* milliwatt */
275 while (power > PCIE_RC_CONFIG_DCR_CSPL_LIMIT) {
276 if (!scale) {
277 dev_warn(rockchip->dev, "invalid power supply\n");
278 return;
279 }
280 scale--;
281 power = power / 10;
282 }
283
284 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCR);
285 status |= (power << PCIE_RC_CONFIG_DCR_CSPL_SHIFT) |
286 (scale << PCIE_RC_CONFIG_DCR_CPLS_SHIFT);
287 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR);
288 }
289
290 /**
291 * rockchip_pcie_host_init_port - Initialize hardware
292 * @rockchip: PCIe port information
293 */
rockchip_pcie_host_init_port(struct rockchip_pcie * rockchip)294 static int rockchip_pcie_host_init_port(struct rockchip_pcie *rockchip)
295 {
296 struct device *dev = rockchip->dev;
297 int err, i = MAX_LANE_NUM;
298 u32 status;
299
300 gpiod_set_value_cansleep(rockchip->ep_gpio, 0);
301
302 err = rockchip_pcie_init_port(rockchip);
303 if (err)
304 return err;
305
306 /* Fix the transmitted FTS count desired to exit from L0s. */
307 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1);
308 status = (status & ~PCIE_CORE_CTRL_PLC1_FTS_MASK) |
309 (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT);
310 rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1);
311
312 rockchip_pcie_set_power_limit(rockchip);
313
314 /* Set RC's clock architecture as common clock */
315 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
316 status |= PCI_EXP_LNKSTA_SLC << 16;
317 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
318
319 /* Set RC's RCB to 128 */
320 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
321 status |= PCI_EXP_LNKCTL_RCB;
322 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
323
324 /* Enable Gen1 training */
325 rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE,
326 PCIE_CLIENT_CONFIG);
327
328 gpiod_set_value_cansleep(rockchip->ep_gpio, 1);
329
330 /* 500ms timeout value should be enough for Gen1/2 training */
331 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_BASIC_STATUS1,
332 status, PCIE_LINK_UP(status), 20,
333 500 * USEC_PER_MSEC);
334 if (err) {
335 dev_err(dev, "PCIe link training gen1 timeout!\n");
336 goto err_power_off_phy;
337 }
338
339 if (rockchip->link_gen == 2) {
340 /*
341 * Enable retrain for gen2. This should be configured only after
342 * gen1 finished.
343 */
344 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
345 status |= PCI_EXP_LNKCTL_RL;
346 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
347
348 err = readl_poll_timeout(rockchip->apb_base + PCIE_CORE_CTRL,
349 status, PCIE_LINK_IS_GEN2(status), 20,
350 500 * USEC_PER_MSEC);
351 if (err)
352 dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n");
353 }
354
355 /* Check the final link width from negotiated lane counter from MGMT */
356 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL);
357 status = 0x1 << ((status & PCIE_CORE_PL_CONF_LANE_MASK) >>
358 PCIE_CORE_PL_CONF_LANE_SHIFT);
359 dev_dbg(dev, "current link width is x%d\n", status);
360
361 /* Power off unused lane(s) */
362 rockchip->lanes_map = rockchip_pcie_lane_map(rockchip);
363 for (i = 0; i < MAX_LANE_NUM; i++) {
364 if (!(rockchip->lanes_map & BIT(i))) {
365 dev_dbg(dev, "idling lane %d\n", i);
366 phy_power_off(rockchip->phys[i]);
367 }
368 }
369
370 rockchip_pcie_write(rockchip, ROCKCHIP_VENDOR_ID,
371 PCIE_CORE_CONFIG_VENDOR);
372 rockchip_pcie_write(rockchip,
373 PCI_CLASS_BRIDGE_PCI_NORMAL << 8,
374 PCIE_RC_CONFIG_RID_CCR);
375
376 /* Clear THP cap's next cap pointer to remove L1 substate cap */
377 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_THP_CAP);
378 status &= ~PCIE_RC_CONFIG_THP_CAP_NEXT_MASK;
379 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_THP_CAP);
380
381 /* Clear L0s from RC's link cap */
382 if (of_property_read_bool(dev->of_node, "aspm-no-l0s")) {
383 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LINK_CAP);
384 status &= ~PCIE_RC_CONFIG_LINK_CAP_L0S;
385 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LINK_CAP);
386 }
387
388 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCSR);
389 status &= ~PCIE_RC_CONFIG_DCSR_MPS_MASK;
390 status |= PCIE_RC_CONFIG_DCSR_MPS_256;
391 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCSR);
392
393 return 0;
394 err_power_off_phy:
395 while (i--)
396 phy_power_off(rockchip->phys[i]);
397 i = MAX_LANE_NUM;
398 while (i--)
399 phy_exit(rockchip->phys[i]);
400 return err;
401 }
402
rockchip_pcie_subsys_irq_handler(int irq,void * arg)403 static irqreturn_t rockchip_pcie_subsys_irq_handler(int irq, void *arg)
404 {
405 struct rockchip_pcie *rockchip = arg;
406 struct device *dev = rockchip->dev;
407 u32 reg;
408 u32 sub_reg;
409
410 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
411 if (reg & PCIE_CLIENT_INT_LOCAL) {
412 dev_dbg(dev, "local interrupt received\n");
413 sub_reg = rockchip_pcie_read(rockchip, PCIE_CORE_INT_STATUS);
414 if (sub_reg & PCIE_CORE_INT_PRFPE)
415 dev_dbg(dev, "parity error detected while reading from the PNP receive FIFO RAM\n");
416
417 if (sub_reg & PCIE_CORE_INT_CRFPE)
418 dev_dbg(dev, "parity error detected while reading from the Completion Receive FIFO RAM\n");
419
420 if (sub_reg & PCIE_CORE_INT_RRPE)
421 dev_dbg(dev, "parity error detected while reading from replay buffer RAM\n");
422
423 if (sub_reg & PCIE_CORE_INT_PRFO)
424 dev_dbg(dev, "overflow occurred in the PNP receive FIFO\n");
425
426 if (sub_reg & PCIE_CORE_INT_CRFO)
427 dev_dbg(dev, "overflow occurred in the completion receive FIFO\n");
428
429 if (sub_reg & PCIE_CORE_INT_RT)
430 dev_dbg(dev, "replay timer timed out\n");
431
432 if (sub_reg & PCIE_CORE_INT_RTR)
433 dev_dbg(dev, "replay timer rolled over after 4 transmissions of the same TLP\n");
434
435 if (sub_reg & PCIE_CORE_INT_PE)
436 dev_dbg(dev, "phy error detected on receive side\n");
437
438 if (sub_reg & PCIE_CORE_INT_MTR)
439 dev_dbg(dev, "malformed TLP received from the link\n");
440
441 if (sub_reg & PCIE_CORE_INT_UCR)
442 dev_dbg(dev, "malformed TLP received from the link\n");
443
444 if (sub_reg & PCIE_CORE_INT_FCE)
445 dev_dbg(dev, "an error was observed in the flow control advertisements from the other side\n");
446
447 if (sub_reg & PCIE_CORE_INT_CT)
448 dev_dbg(dev, "a request timed out waiting for completion\n");
449
450 if (sub_reg & PCIE_CORE_INT_UTC)
451 dev_dbg(dev, "unmapped TC error\n");
452
453 if (sub_reg & PCIE_CORE_INT_MMVC)
454 dev_dbg(dev, "MSI mask register changes\n");
455
456 rockchip_pcie_write(rockchip, sub_reg, PCIE_CORE_INT_STATUS);
457 } else if (reg & PCIE_CLIENT_INT_PHY) {
458 dev_dbg(dev, "phy link changes\n");
459 rockchip_pcie_update_txcredit_mui(rockchip);
460 rockchip_pcie_clr_bw_int(rockchip);
461 }
462
463 rockchip_pcie_write(rockchip, reg & PCIE_CLIENT_INT_LOCAL,
464 PCIE_CLIENT_INT_STATUS);
465
466 return IRQ_HANDLED;
467 }
468
rockchip_pcie_client_irq_handler(int irq,void * arg)469 static irqreturn_t rockchip_pcie_client_irq_handler(int irq, void *arg)
470 {
471 struct rockchip_pcie *rockchip = arg;
472 struct device *dev = rockchip->dev;
473 u32 reg;
474
475 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
476 if (reg & PCIE_CLIENT_INT_LEGACY_DONE)
477 dev_dbg(dev, "legacy done interrupt received\n");
478
479 if (reg & PCIE_CLIENT_INT_MSG)
480 dev_dbg(dev, "message done interrupt received\n");
481
482 if (reg & PCIE_CLIENT_INT_HOT_RST)
483 dev_dbg(dev, "hot reset interrupt received\n");
484
485 if (reg & PCIE_CLIENT_INT_DPA)
486 dev_dbg(dev, "dpa interrupt received\n");
487
488 if (reg & PCIE_CLIENT_INT_FATAL_ERR)
489 dev_dbg(dev, "fatal error interrupt received\n");
490
491 if (reg & PCIE_CLIENT_INT_NFATAL_ERR)
492 dev_dbg(dev, "no fatal error interrupt received\n");
493
494 if (reg & PCIE_CLIENT_INT_CORR_ERR)
495 dev_dbg(dev, "correctable error interrupt received\n");
496
497 if (reg & PCIE_CLIENT_INT_PHY)
498 dev_dbg(dev, "phy interrupt received\n");
499
500 rockchip_pcie_write(rockchip, reg & (PCIE_CLIENT_INT_LEGACY_DONE |
501 PCIE_CLIENT_INT_MSG | PCIE_CLIENT_INT_HOT_RST |
502 PCIE_CLIENT_INT_DPA | PCIE_CLIENT_INT_FATAL_ERR |
503 PCIE_CLIENT_INT_NFATAL_ERR |
504 PCIE_CLIENT_INT_CORR_ERR |
505 PCIE_CLIENT_INT_PHY),
506 PCIE_CLIENT_INT_STATUS);
507
508 return IRQ_HANDLED;
509 }
510
rockchip_pcie_legacy_int_handler(struct irq_desc * desc)511 static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
512 {
513 struct irq_chip *chip = irq_desc_get_chip(desc);
514 struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc);
515 struct device *dev = rockchip->dev;
516 u32 reg;
517 u32 hwirq;
518 int ret;
519
520 chained_irq_enter(chip, desc);
521
522 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
523 reg = (reg & PCIE_CLIENT_INTR_MASK) >> PCIE_CLIENT_INTR_SHIFT;
524
525 while (reg) {
526 hwirq = ffs(reg) - 1;
527 reg &= ~BIT(hwirq);
528
529 ret = generic_handle_domain_irq(rockchip->irq_domain, hwirq);
530 if (ret)
531 dev_err(dev, "unexpected IRQ, INT%d\n", hwirq);
532 }
533
534 chained_irq_exit(chip, desc);
535 }
536
rockchip_pcie_setup_irq(struct rockchip_pcie * rockchip)537 static int rockchip_pcie_setup_irq(struct rockchip_pcie *rockchip)
538 {
539 int irq, err;
540 struct device *dev = rockchip->dev;
541 struct platform_device *pdev = to_platform_device(dev);
542
543 irq = platform_get_irq_byname(pdev, "sys");
544 if (irq < 0)
545 return irq;
546
547 err = devm_request_irq(dev, irq, rockchip_pcie_subsys_irq_handler,
548 IRQF_SHARED, "pcie-sys", rockchip);
549 if (err) {
550 dev_err(dev, "failed to request PCIe subsystem IRQ\n");
551 return err;
552 }
553
554 irq = platform_get_irq_byname(pdev, "legacy");
555 if (irq < 0)
556 return irq;
557
558 irq_set_chained_handler_and_data(irq,
559 rockchip_pcie_legacy_int_handler,
560 rockchip);
561
562 irq = platform_get_irq_byname(pdev, "client");
563 if (irq < 0)
564 return irq;
565
566 err = devm_request_irq(dev, irq, rockchip_pcie_client_irq_handler,
567 IRQF_SHARED, "pcie-client", rockchip);
568 if (err) {
569 dev_err(dev, "failed to request PCIe client IRQ\n");
570 return err;
571 }
572
573 return 0;
574 }
575
576 /**
577 * rockchip_pcie_parse_host_dt - Parse Device Tree
578 * @rockchip: PCIe port information
579 *
580 * Return: '0' on success and error value on failure
581 */
rockchip_pcie_parse_host_dt(struct rockchip_pcie * rockchip)582 static int rockchip_pcie_parse_host_dt(struct rockchip_pcie *rockchip)
583 {
584 struct device *dev = rockchip->dev;
585 int err;
586
587 err = rockchip_pcie_parse_dt(rockchip);
588 if (err)
589 return err;
590
591 rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v");
592 if (IS_ERR(rockchip->vpcie12v)) {
593 if (PTR_ERR(rockchip->vpcie12v) != -ENODEV)
594 return PTR_ERR(rockchip->vpcie12v);
595 dev_info(dev, "no vpcie12v regulator found\n");
596 }
597
598 rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
599 if (IS_ERR(rockchip->vpcie3v3)) {
600 if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
601 return PTR_ERR(rockchip->vpcie3v3);
602 dev_info(dev, "no vpcie3v3 regulator found\n");
603 }
604
605 rockchip->vpcie1v8 = devm_regulator_get(dev, "vpcie1v8");
606 if (IS_ERR(rockchip->vpcie1v8))
607 return PTR_ERR(rockchip->vpcie1v8);
608
609 rockchip->vpcie0v9 = devm_regulator_get(dev, "vpcie0v9");
610 if (IS_ERR(rockchip->vpcie0v9))
611 return PTR_ERR(rockchip->vpcie0v9);
612
613 return 0;
614 }
615
rockchip_pcie_set_vpcie(struct rockchip_pcie * rockchip)616 static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
617 {
618 struct device *dev = rockchip->dev;
619 int err;
620
621 if (!IS_ERR(rockchip->vpcie12v)) {
622 err = regulator_enable(rockchip->vpcie12v);
623 if (err) {
624 dev_err(dev, "fail to enable vpcie12v regulator\n");
625 goto err_out;
626 }
627 }
628
629 if (!IS_ERR(rockchip->vpcie3v3)) {
630 err = regulator_enable(rockchip->vpcie3v3);
631 if (err) {
632 dev_err(dev, "fail to enable vpcie3v3 regulator\n");
633 goto err_disable_12v;
634 }
635 }
636
637 err = regulator_enable(rockchip->vpcie1v8);
638 if (err) {
639 dev_err(dev, "fail to enable vpcie1v8 regulator\n");
640 goto err_disable_3v3;
641 }
642
643 err = regulator_enable(rockchip->vpcie0v9);
644 if (err) {
645 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
646 goto err_disable_1v8;
647 }
648
649 return 0;
650
651 err_disable_1v8:
652 regulator_disable(rockchip->vpcie1v8);
653 err_disable_3v3:
654 if (!IS_ERR(rockchip->vpcie3v3))
655 regulator_disable(rockchip->vpcie3v3);
656 err_disable_12v:
657 if (!IS_ERR(rockchip->vpcie12v))
658 regulator_disable(rockchip->vpcie12v);
659 err_out:
660 return err;
661 }
662
rockchip_pcie_enable_interrupts(struct rockchip_pcie * rockchip)663 static void rockchip_pcie_enable_interrupts(struct rockchip_pcie *rockchip)
664 {
665 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) &
666 (~PCIE_CLIENT_INT_CLI), PCIE_CLIENT_INT_MASK);
667 rockchip_pcie_write(rockchip, (u32)(~PCIE_CORE_INT),
668 PCIE_CORE_INT_MASK);
669
670 rockchip_pcie_enable_bw_int(rockchip);
671 }
672
rockchip_pcie_intx_map(struct irq_domain * domain,unsigned int irq,irq_hw_number_t hwirq)673 static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
674 irq_hw_number_t hwirq)
675 {
676 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
677 irq_set_chip_data(irq, domain->host_data);
678
679 return 0;
680 }
681
682 static const struct irq_domain_ops intx_domain_ops = {
683 .map = rockchip_pcie_intx_map,
684 };
685
rockchip_pcie_init_irq_domain(struct rockchip_pcie * rockchip)686 static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
687 {
688 struct device *dev = rockchip->dev;
689 struct device_node *intc = of_get_next_child(dev->of_node, NULL);
690
691 if (!intc) {
692 dev_err(dev, "missing child interrupt-controller node\n");
693 return -EINVAL;
694 }
695
696 rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
697 &intx_domain_ops, rockchip);
698 of_node_put(intc);
699 if (!rockchip->irq_domain) {
700 dev_err(dev, "failed to get a INTx IRQ domain\n");
701 return -EINVAL;
702 }
703
704 return 0;
705 }
706
rockchip_pcie_prog_ob_atu(struct rockchip_pcie * rockchip,int region_no,int type,u8 num_pass_bits,u32 lower_addr,u32 upper_addr)707 static int rockchip_pcie_prog_ob_atu(struct rockchip_pcie *rockchip,
708 int region_no, int type, u8 num_pass_bits,
709 u32 lower_addr, u32 upper_addr)
710 {
711 u32 ob_addr_0;
712 u32 ob_addr_1;
713 u32 ob_desc_0;
714 u32 aw_offset;
715
716 if (region_no >= MAX_AXI_WRAPPER_REGION_NUM)
717 return -EINVAL;
718 if (num_pass_bits + 1 < 8)
719 return -EINVAL;
720 if (num_pass_bits > 63)
721 return -EINVAL;
722 if (region_no == 0) {
723 if (AXI_REGION_0_SIZE < (2ULL << num_pass_bits))
724 return -EINVAL;
725 }
726 if (region_no != 0) {
727 if (AXI_REGION_SIZE < (2ULL << num_pass_bits))
728 return -EINVAL;
729 }
730
731 aw_offset = (region_no << OB_REG_SIZE_SHIFT);
732
733 ob_addr_0 = num_pass_bits & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS;
734 ob_addr_0 |= lower_addr & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR;
735 ob_addr_1 = upper_addr;
736 ob_desc_0 = (1 << 23 | type);
737
738 rockchip_pcie_write(rockchip, ob_addr_0,
739 PCIE_CORE_OB_REGION_ADDR0 + aw_offset);
740 rockchip_pcie_write(rockchip, ob_addr_1,
741 PCIE_CORE_OB_REGION_ADDR1 + aw_offset);
742 rockchip_pcie_write(rockchip, ob_desc_0,
743 PCIE_CORE_OB_REGION_DESC0 + aw_offset);
744 rockchip_pcie_write(rockchip, 0,
745 PCIE_CORE_OB_REGION_DESC1 + aw_offset);
746
747 return 0;
748 }
749
rockchip_pcie_prog_ib_atu(struct rockchip_pcie * rockchip,int region_no,u8 num_pass_bits,u32 lower_addr,u32 upper_addr)750 static int rockchip_pcie_prog_ib_atu(struct rockchip_pcie *rockchip,
751 int region_no, u8 num_pass_bits,
752 u32 lower_addr, u32 upper_addr)
753 {
754 u32 ib_addr_0;
755 u32 ib_addr_1;
756 u32 aw_offset;
757
758 if (region_no > MAX_AXI_IB_ROOTPORT_REGION_NUM)
759 return -EINVAL;
760 if (num_pass_bits + 1 < MIN_AXI_ADDR_BITS_PASSED)
761 return -EINVAL;
762 if (num_pass_bits > 63)
763 return -EINVAL;
764
765 aw_offset = (region_no << IB_ROOT_PORT_REG_SIZE_SHIFT);
766
767 ib_addr_0 = num_pass_bits & PCIE_CORE_IB_REGION_ADDR0_NUM_BITS;
768 ib_addr_0 |= (lower_addr << 8) & PCIE_CORE_IB_REGION_ADDR0_LO_ADDR;
769 ib_addr_1 = upper_addr;
770
771 rockchip_pcie_write(rockchip, ib_addr_0, PCIE_RP_IB_ADDR0 + aw_offset);
772 rockchip_pcie_write(rockchip, ib_addr_1, PCIE_RP_IB_ADDR1 + aw_offset);
773
774 return 0;
775 }
776
rockchip_pcie_cfg_atu(struct rockchip_pcie * rockchip)777 static int rockchip_pcie_cfg_atu(struct rockchip_pcie *rockchip)
778 {
779 struct device *dev = rockchip->dev;
780 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rockchip);
781 struct resource_entry *entry;
782 u64 pci_addr, size;
783 int offset;
784 int err;
785 int reg_no;
786
787 rockchip_pcie_cfg_configuration_accesses(rockchip,
788 AXI_WRAPPER_TYPE0_CFG);
789 entry = resource_list_first_type(&bridge->windows, IORESOURCE_MEM);
790 if (!entry)
791 return -ENODEV;
792
793 size = resource_size(entry->res);
794 pci_addr = entry->res->start - entry->offset;
795 rockchip->msg_bus_addr = pci_addr;
796
797 for (reg_no = 0; reg_no < (size >> 20); reg_no++) {
798 err = rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1,
799 AXI_WRAPPER_MEM_WRITE,
800 20 - 1,
801 pci_addr + (reg_no << 20),
802 0);
803 if (err) {
804 dev_err(dev, "program RC mem outbound ATU failed\n");
805 return err;
806 }
807 }
808
809 err = rockchip_pcie_prog_ib_atu(rockchip, 2, 32 - 1, 0x0, 0);
810 if (err) {
811 dev_err(dev, "program RC mem inbound ATU failed\n");
812 return err;
813 }
814
815 entry = resource_list_first_type(&bridge->windows, IORESOURCE_IO);
816 if (!entry)
817 return -ENODEV;
818
819 /* store the register number offset to program RC io outbound ATU */
820 offset = size >> 20;
821
822 size = resource_size(entry->res);
823 pci_addr = entry->res->start - entry->offset;
824
825 for (reg_no = 0; reg_no < (size >> 20); reg_no++) {
826 err = rockchip_pcie_prog_ob_atu(rockchip,
827 reg_no + 1 + offset,
828 AXI_WRAPPER_IO_WRITE,
829 20 - 1,
830 pci_addr + (reg_no << 20),
831 0);
832 if (err) {
833 dev_err(dev, "program RC io outbound ATU failed\n");
834 return err;
835 }
836 }
837
838 /* assign message regions */
839 rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1 + offset,
840 AXI_WRAPPER_NOR_MSG,
841 20 - 1, 0, 0);
842
843 rockchip->msg_bus_addr += ((reg_no + offset) << 20);
844 return err;
845 }
846
rockchip_pcie_wait_l2(struct rockchip_pcie * rockchip)847 static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip)
848 {
849 u32 value;
850 int err;
851
852 /* send PME_TURN_OFF message */
853 writel(0x0, rockchip->msg_region + PCIE_RC_SEND_PME_OFF);
854
855 /* read LTSSM and wait for falling into L2 link state */
856 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_DEBUG_OUT_0,
857 value, PCIE_LINK_IS_L2(value), 20,
858 jiffies_to_usecs(5 * HZ));
859 if (err) {
860 dev_err(rockchip->dev, "PCIe link enter L2 timeout!\n");
861 return err;
862 }
863
864 return 0;
865 }
866
rockchip_pcie_suspend_noirq(struct device * dev)867 static int rockchip_pcie_suspend_noirq(struct device *dev)
868 {
869 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
870 int ret;
871
872 /* disable core and cli int since we don't need to ack PME_ACK */
873 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
874 PCIE_CLIENT_INT_CLI, PCIE_CLIENT_INT_MASK);
875 rockchip_pcie_write(rockchip, (u32)PCIE_CORE_INT, PCIE_CORE_INT_MASK);
876
877 ret = rockchip_pcie_wait_l2(rockchip);
878 if (ret) {
879 rockchip_pcie_enable_interrupts(rockchip);
880 return ret;
881 }
882
883 rockchip_pcie_deinit_phys(rockchip);
884
885 rockchip_pcie_disable_clocks(rockchip);
886
887 regulator_disable(rockchip->vpcie0v9);
888
889 return ret;
890 }
891
rockchip_pcie_resume_noirq(struct device * dev)892 static int rockchip_pcie_resume_noirq(struct device *dev)
893 {
894 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
895 int err;
896
897 err = regulator_enable(rockchip->vpcie0v9);
898 if (err) {
899 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
900 return err;
901 }
902
903 err = rockchip_pcie_enable_clocks(rockchip);
904 if (err)
905 goto err_disable_0v9;
906
907 err = rockchip_pcie_host_init_port(rockchip);
908 if (err)
909 goto err_pcie_resume;
910
911 err = rockchip_pcie_cfg_atu(rockchip);
912 if (err)
913 goto err_err_deinit_port;
914
915 /* Need this to enter L1 again */
916 rockchip_pcie_update_txcredit_mui(rockchip);
917 rockchip_pcie_enable_interrupts(rockchip);
918
919 return 0;
920
921 err_err_deinit_port:
922 rockchip_pcie_deinit_phys(rockchip);
923 err_pcie_resume:
924 rockchip_pcie_disable_clocks(rockchip);
925 err_disable_0v9:
926 regulator_disable(rockchip->vpcie0v9);
927 return err;
928 }
929
rockchip_pcie_probe(struct platform_device * pdev)930 static int rockchip_pcie_probe(struct platform_device *pdev)
931 {
932 struct rockchip_pcie *rockchip;
933 struct device *dev = &pdev->dev;
934 struct pci_host_bridge *bridge;
935 int err;
936
937 if (!dev->of_node)
938 return -ENODEV;
939
940 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rockchip));
941 if (!bridge)
942 return -ENOMEM;
943
944 rockchip = pci_host_bridge_priv(bridge);
945
946 platform_set_drvdata(pdev, rockchip);
947 rockchip->dev = dev;
948 rockchip->is_rc = true;
949
950 err = rockchip_pcie_parse_host_dt(rockchip);
951 if (err)
952 return err;
953
954 err = rockchip_pcie_enable_clocks(rockchip);
955 if (err)
956 return err;
957
958 err = rockchip_pcie_set_vpcie(rockchip);
959 if (err) {
960 dev_err(dev, "failed to set vpcie regulator\n");
961 goto err_set_vpcie;
962 }
963
964 err = rockchip_pcie_host_init_port(rockchip);
965 if (err)
966 goto err_vpcie;
967
968 err = rockchip_pcie_init_irq_domain(rockchip);
969 if (err < 0)
970 goto err_deinit_port;
971
972 err = rockchip_pcie_cfg_atu(rockchip);
973 if (err)
974 goto err_remove_irq_domain;
975
976 rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M);
977 if (!rockchip->msg_region) {
978 err = -ENOMEM;
979 goto err_remove_irq_domain;
980 }
981
982 bridge->sysdata = rockchip;
983 bridge->ops = &rockchip_pcie_ops;
984
985 err = rockchip_pcie_setup_irq(rockchip);
986 if (err)
987 goto err_remove_irq_domain;
988
989 rockchip_pcie_enable_interrupts(rockchip);
990
991 err = pci_host_probe(bridge);
992 if (err < 0)
993 goto err_remove_irq_domain;
994
995 return 0;
996
997 err_remove_irq_domain:
998 irq_domain_remove(rockchip->irq_domain);
999 err_deinit_port:
1000 rockchip_pcie_deinit_phys(rockchip);
1001 err_vpcie:
1002 if (!IS_ERR(rockchip->vpcie12v))
1003 regulator_disable(rockchip->vpcie12v);
1004 if (!IS_ERR(rockchip->vpcie3v3))
1005 regulator_disable(rockchip->vpcie3v3);
1006 regulator_disable(rockchip->vpcie1v8);
1007 regulator_disable(rockchip->vpcie0v9);
1008 err_set_vpcie:
1009 rockchip_pcie_disable_clocks(rockchip);
1010 return err;
1011 }
1012
rockchip_pcie_remove(struct platform_device * pdev)1013 static int rockchip_pcie_remove(struct platform_device *pdev)
1014 {
1015 struct device *dev = &pdev->dev;
1016 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
1017 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(rockchip);
1018
1019 pci_stop_root_bus(bridge->bus);
1020 pci_remove_root_bus(bridge->bus);
1021 irq_domain_remove(rockchip->irq_domain);
1022
1023 rockchip_pcie_deinit_phys(rockchip);
1024
1025 rockchip_pcie_disable_clocks(rockchip);
1026
1027 if (!IS_ERR(rockchip->vpcie12v))
1028 regulator_disable(rockchip->vpcie12v);
1029 if (!IS_ERR(rockchip->vpcie3v3))
1030 regulator_disable(rockchip->vpcie3v3);
1031 regulator_disable(rockchip->vpcie1v8);
1032 regulator_disable(rockchip->vpcie0v9);
1033
1034 return 0;
1035 }
1036
1037 static const struct dev_pm_ops rockchip_pcie_pm_ops = {
1038 NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq,
1039 rockchip_pcie_resume_noirq)
1040 };
1041
1042 static const struct of_device_id rockchip_pcie_of_match[] = {
1043 { .compatible = "rockchip,rk3399-pcie", },
1044 {}
1045 };
1046 MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match);
1047
1048 static struct platform_driver rockchip_pcie_driver = {
1049 .driver = {
1050 .name = "rockchip-pcie",
1051 .of_match_table = rockchip_pcie_of_match,
1052 .pm = &rockchip_pcie_pm_ops,
1053 },
1054 .probe = rockchip_pcie_probe,
1055 .remove = rockchip_pcie_remove,
1056 };
1057 module_platform_driver(rockchip_pcie_driver);
1058
1059 MODULE_AUTHOR("Rockchip Inc");
1060 MODULE_DESCRIPTION("Rockchip AXI PCIe driver");
1061 MODULE_LICENSE("GPL v2");
1062
