1 // SPDX-License-Identifier: GPL-2.0+
3 * Rockchip AXI PCIe host controller driver
5 * Copyright (c) 2016 Rockchip, Inc.
7 * Author: Shawn Lin <shawn.lin@rock-chips.com>
8 * Wenrui Li <wenrui.li@rock-chips.com>
10 * Bits taken from Synopsys DesignWare Host controller driver and
11 * ARM PCI Host generic driver.
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>
40 #include "pcie-rockchip.h"
42 static void rockchip_pcie_enable_bw_int(struct rockchip_pcie *rockchip)
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);
51 static void rockchip_pcie_clr_bw_int(struct rockchip_pcie *rockchip)
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);
60 static void rockchip_pcie_update_txcredit_mui(struct rockchip_pcie *rockchip)
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);
71 static int rockchip_pcie_valid_device(struct rockchip_pcie *rockchip,
72 struct pci_bus *bus, int dev)
74 /* access only one slot on each root port */
75 if (bus->number == rockchip->root_bus_nr && dev > 0)
79 * do not read more than one device on the bus directly attached
80 * to RC's downstream side.
82 if (bus->primary == rockchip->root_bus_nr && dev > 0)
88 static u8 rockchip_pcie_lane_map(struct rockchip_pcie *rockchip)
93 if (rockchip->legacy_phy)
94 return GENMASK(MAX_LANE_NUM - 1, 0);
96 val = rockchip_pcie_read(rockchip, PCIE_CORE_LANE_MAP);
97 map = val & PCIE_CORE_LANE_MAP_MASK;
99 /* The link may be using a reverse-indexed mapping. */
100 if (val & PCIE_CORE_LANE_MAP_REVERSE)
101 map = bitrev8(map) >> 4;
106 static int rockchip_pcie_rd_own_conf(struct rockchip_pcie *rockchip,
107 int where, int size, u32 *val)
111 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + where;
113 if (!IS_ALIGNED((uintptr_t)addr, size)) {
115 return PCIBIOS_BAD_REGISTER_NUMBER;
120 } else if (size == 2) {
122 } else if (size == 1) {
126 return PCIBIOS_BAD_REGISTER_NUMBER;
128 return PCIBIOS_SUCCESSFUL;
131 static int rockchip_pcie_wr_own_conf(struct rockchip_pcie *rockchip,
132 int where, int size, u32 val)
134 u32 mask, tmp, offset;
137 offset = where & ~0x3;
138 addr = rockchip->apb_base + PCIE_RC_CONFIG_NORMAL_BASE + offset;
142 return PCIBIOS_SUCCESSFUL;
145 mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));
148 * N.B. This read/modify/write isn't safe in general because it can
149 * corrupt RW1C bits in adjacent registers. But the hardware
150 * doesn't support smaller writes.
152 tmp = readl(addr) & mask;
153 tmp |= val << ((where & 0x3) * 8);
156 return PCIBIOS_SUCCESSFUL;
159 static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip,
160 struct pci_bus *bus, u32 devfn,
161 int where, int size, u32 *val)
165 busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
166 PCI_FUNC(devfn), where);
168 if (!IS_ALIGNED(busdev, size)) {
170 return PCIBIOS_BAD_REGISTER_NUMBER;
173 if (bus->parent->number == rockchip->root_bus_nr)
174 rockchip_pcie_cfg_configuration_accesses(rockchip,
175 AXI_WRAPPER_TYPE0_CFG);
177 rockchip_pcie_cfg_configuration_accesses(rockchip,
178 AXI_WRAPPER_TYPE1_CFG);
181 *val = readl(rockchip->reg_base + busdev);
182 } else if (size == 2) {
183 *val = readw(rockchip->reg_base + busdev);
184 } else if (size == 1) {
185 *val = readb(rockchip->reg_base + busdev);
188 return PCIBIOS_BAD_REGISTER_NUMBER;
190 return PCIBIOS_SUCCESSFUL;
193 static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip,
194 struct pci_bus *bus, u32 devfn,
195 int where, int size, u32 val)
199 busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
200 PCI_FUNC(devfn), where);
201 if (!IS_ALIGNED(busdev, size))
202 return PCIBIOS_BAD_REGISTER_NUMBER;
204 if (bus->parent->number == rockchip->root_bus_nr)
205 rockchip_pcie_cfg_configuration_accesses(rockchip,
206 AXI_WRAPPER_TYPE0_CFG);
208 rockchip_pcie_cfg_configuration_accesses(rockchip,
209 AXI_WRAPPER_TYPE1_CFG);
212 writel(val, rockchip->reg_base + busdev);
214 writew(val, rockchip->reg_base + busdev);
216 writeb(val, rockchip->reg_base + busdev);
218 return PCIBIOS_BAD_REGISTER_NUMBER;
220 return PCIBIOS_SUCCESSFUL;
223 static int rockchip_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
226 struct rockchip_pcie *rockchip = bus->sysdata;
228 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn))) {
230 return PCIBIOS_DEVICE_NOT_FOUND;
233 if (bus->number == rockchip->root_bus_nr)
234 return rockchip_pcie_rd_own_conf(rockchip, where, size, val);
236 return rockchip_pcie_rd_other_conf(rockchip, bus, devfn, where, size,
240 static int rockchip_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
241 int where, int size, u32 val)
243 struct rockchip_pcie *rockchip = bus->sysdata;
245 if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn)))
246 return PCIBIOS_DEVICE_NOT_FOUND;
248 if (bus->number == rockchip->root_bus_nr)
249 return rockchip_pcie_wr_own_conf(rockchip, where, size, val);
251 return rockchip_pcie_wr_other_conf(rockchip, bus, devfn, where, size,
255 static struct pci_ops rockchip_pcie_ops = {
256 .read = rockchip_pcie_rd_conf,
257 .write = rockchip_pcie_wr_conf,
260 static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
263 u32 status, scale, power;
265 if (IS_ERR(rockchip->vpcie3v3))
269 * Set RC's captured slot power limit and scale if
270 * vpcie3v3 available. The default values are both zero
271 * which means the software should set these two according
272 * to the actual power supply.
274 curr = regulator_get_current_limit(rockchip->vpcie3v3);
278 scale = 3; /* 0.001x */
279 curr = curr / 1000; /* convert to mA */
280 power = (curr * 3300) / 1000; /* milliwatt */
281 while (power > PCIE_RC_CONFIG_DCR_CSPL_LIMIT) {
283 dev_warn(rockchip->dev, "invalid power supply\n");
290 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCR);
291 status |= (power << PCIE_RC_CONFIG_DCR_CSPL_SHIFT) |
292 (scale << PCIE_RC_CONFIG_DCR_CPLS_SHIFT);
293 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR);
297 * rockchip_pcie_host_init_port - Initialize hardware
298 * @rockchip: PCIe port information
300 static int rockchip_pcie_host_init_port(struct rockchip_pcie *rockchip)
302 struct device *dev = rockchip->dev;
303 int err, i = MAX_LANE_NUM;
306 gpiod_set_value_cansleep(rockchip->ep_gpio, 0);
308 err = rockchip_pcie_init_port(rockchip);
312 /* Fix the transmitted FTS count desired to exit from L0s. */
313 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1);
314 status = (status & ~PCIE_CORE_CTRL_PLC1_FTS_MASK) |
315 (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT);
316 rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1);
318 rockchip_pcie_set_power_limit(rockchip);
320 /* Set RC's clock architecture as common clock */
321 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
322 status |= PCI_EXP_LNKSTA_SLC << 16;
323 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
325 /* Set RC's RCB to 128 */
326 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
327 status |= PCI_EXP_LNKCTL_RCB;
328 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
330 /* Enable Gen1 training */
331 rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE,
334 gpiod_set_value_cansleep(rockchip->ep_gpio, 1);
336 /* 500ms timeout value should be enough for Gen1/2 training */
337 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_BASIC_STATUS1,
338 status, PCIE_LINK_UP(status), 20,
339 500 * USEC_PER_MSEC);
341 dev_err(dev, "PCIe link training gen1 timeout!\n");
342 goto err_power_off_phy;
345 if (rockchip->link_gen == 2) {
347 * Enable retrain for gen2. This should be configured only after
350 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
351 status |= PCI_EXP_LNKCTL_RL;
352 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
354 err = readl_poll_timeout(rockchip->apb_base + PCIE_CORE_CTRL,
355 status, PCIE_LINK_IS_GEN2(status), 20,
356 500 * USEC_PER_MSEC);
358 dev_dbg(dev, "PCIe link training gen2 timeout, fall back to gen1!\n");
361 /* Check the final link width from negotiated lane counter from MGMT */
362 status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL);
363 status = 0x1 << ((status & PCIE_CORE_PL_CONF_LANE_MASK) >>
364 PCIE_CORE_PL_CONF_LANE_SHIFT);
365 dev_dbg(dev, "current link width is x%d\n", status);
367 /* Power off unused lane(s) */
368 rockchip->lanes_map = rockchip_pcie_lane_map(rockchip);
369 for (i = 0; i < MAX_LANE_NUM; i++) {
370 if (!(rockchip->lanes_map & BIT(i))) {
371 dev_dbg(dev, "idling lane %d\n", i);
372 phy_power_off(rockchip->phys[i]);
376 rockchip_pcie_write(rockchip, ROCKCHIP_VENDOR_ID,
377 PCIE_CORE_CONFIG_VENDOR);
378 rockchip_pcie_write(rockchip,
379 PCI_CLASS_BRIDGE_PCI << PCIE_RC_CONFIG_SCC_SHIFT,
380 PCIE_RC_CONFIG_RID_CCR);
382 /* Clear THP cap's next cap pointer to remove L1 substate cap */
383 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_THP_CAP);
384 status &= ~PCIE_RC_CONFIG_THP_CAP_NEXT_MASK;
385 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_THP_CAP);
387 /* Clear L0s from RC's link cap */
388 if (of_property_read_bool(dev->of_node, "aspm-no-l0s")) {
389 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LINK_CAP);
390 status &= ~PCIE_RC_CONFIG_LINK_CAP_L0S;
391 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LINK_CAP);
394 status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCSR);
395 status &= ~PCIE_RC_CONFIG_DCSR_MPS_MASK;
396 status |= PCIE_RC_CONFIG_DCSR_MPS_256;
397 rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCSR);
402 phy_power_off(rockchip->phys[i]);
405 phy_exit(rockchip->phys[i]);
409 static irqreturn_t rockchip_pcie_subsys_irq_handler(int irq, void *arg)
411 struct rockchip_pcie *rockchip = arg;
412 struct device *dev = rockchip->dev;
416 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
417 if (reg & PCIE_CLIENT_INT_LOCAL) {
418 dev_dbg(dev, "local interrupt received\n");
419 sub_reg = rockchip_pcie_read(rockchip, PCIE_CORE_INT_STATUS);
420 if (sub_reg & PCIE_CORE_INT_PRFPE)
421 dev_dbg(dev, "parity error detected while reading from the PNP receive FIFO RAM\n");
423 if (sub_reg & PCIE_CORE_INT_CRFPE)
424 dev_dbg(dev, "parity error detected while reading from the Completion Receive FIFO RAM\n");
426 if (sub_reg & PCIE_CORE_INT_RRPE)
427 dev_dbg(dev, "parity error detected while reading from replay buffer RAM\n");
429 if (sub_reg & PCIE_CORE_INT_PRFO)
430 dev_dbg(dev, "overflow occurred in the PNP receive FIFO\n");
432 if (sub_reg & PCIE_CORE_INT_CRFO)
433 dev_dbg(dev, "overflow occurred in the completion receive FIFO\n");
435 if (sub_reg & PCIE_CORE_INT_RT)
436 dev_dbg(dev, "replay timer timed out\n");
438 if (sub_reg & PCIE_CORE_INT_RTR)
439 dev_dbg(dev, "replay timer rolled over after 4 transmissions of the same TLP\n");
441 if (sub_reg & PCIE_CORE_INT_PE)
442 dev_dbg(dev, "phy error detected on receive side\n");
444 if (sub_reg & PCIE_CORE_INT_MTR)
445 dev_dbg(dev, "malformed TLP received from the link\n");
447 if (sub_reg & PCIE_CORE_INT_UCR)
448 dev_dbg(dev, "malformed TLP received from the link\n");
450 if (sub_reg & PCIE_CORE_INT_FCE)
451 dev_dbg(dev, "an error was observed in the flow control advertisements from the other side\n");
453 if (sub_reg & PCIE_CORE_INT_CT)
454 dev_dbg(dev, "a request timed out waiting for completion\n");
456 if (sub_reg & PCIE_CORE_INT_UTC)
457 dev_dbg(dev, "unmapped TC error\n");
459 if (sub_reg & PCIE_CORE_INT_MMVC)
460 dev_dbg(dev, "MSI mask register changes\n");
462 rockchip_pcie_write(rockchip, sub_reg, PCIE_CORE_INT_STATUS);
463 } else if (reg & PCIE_CLIENT_INT_PHY) {
464 dev_dbg(dev, "phy link changes\n");
465 rockchip_pcie_update_txcredit_mui(rockchip);
466 rockchip_pcie_clr_bw_int(rockchip);
469 rockchip_pcie_write(rockchip, reg & PCIE_CLIENT_INT_LOCAL,
470 PCIE_CLIENT_INT_STATUS);
475 static irqreturn_t rockchip_pcie_client_irq_handler(int irq, void *arg)
477 struct rockchip_pcie *rockchip = arg;
478 struct device *dev = rockchip->dev;
481 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
482 if (reg & PCIE_CLIENT_INT_LEGACY_DONE)
483 dev_dbg(dev, "legacy done interrupt received\n");
485 if (reg & PCIE_CLIENT_INT_MSG)
486 dev_dbg(dev, "message done interrupt received\n");
488 if (reg & PCIE_CLIENT_INT_HOT_RST)
489 dev_dbg(dev, "hot reset interrupt received\n");
491 if (reg & PCIE_CLIENT_INT_DPA)
492 dev_dbg(dev, "dpa interrupt received\n");
494 if (reg & PCIE_CLIENT_INT_FATAL_ERR)
495 dev_dbg(dev, "fatal error interrupt received\n");
497 if (reg & PCIE_CLIENT_INT_NFATAL_ERR)
498 dev_dbg(dev, "no fatal error interrupt received\n");
500 if (reg & PCIE_CLIENT_INT_CORR_ERR)
501 dev_dbg(dev, "correctable error interrupt received\n");
503 if (reg & PCIE_CLIENT_INT_PHY)
504 dev_dbg(dev, "phy interrupt received\n");
506 rockchip_pcie_write(rockchip, reg & (PCIE_CLIENT_INT_LEGACY_DONE |
507 PCIE_CLIENT_INT_MSG | PCIE_CLIENT_INT_HOT_RST |
508 PCIE_CLIENT_INT_DPA | PCIE_CLIENT_INT_FATAL_ERR |
509 PCIE_CLIENT_INT_NFATAL_ERR |
510 PCIE_CLIENT_INT_CORR_ERR |
511 PCIE_CLIENT_INT_PHY),
512 PCIE_CLIENT_INT_STATUS);
517 static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
519 struct irq_chip *chip = irq_desc_get_chip(desc);
520 struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc);
521 struct device *dev = rockchip->dev;
526 chained_irq_enter(chip, desc);
528 reg = rockchip_pcie_read(rockchip, PCIE_CLIENT_INT_STATUS);
529 reg = (reg & PCIE_CLIENT_INTR_MASK) >> PCIE_CLIENT_INTR_SHIFT;
532 hwirq = ffs(reg) - 1;
535 virq = irq_find_mapping(rockchip->irq_domain, hwirq);
537 generic_handle_irq(virq);
539 dev_err(dev, "unexpected IRQ, INT%d\n", hwirq);
542 chained_irq_exit(chip, desc);
545 static int rockchip_pcie_setup_irq(struct rockchip_pcie *rockchip)
548 struct device *dev = rockchip->dev;
549 struct platform_device *pdev = to_platform_device(dev);
551 irq = platform_get_irq_byname(pdev, "sys");
553 dev_err(dev, "missing sys IRQ resource\n");
557 err = devm_request_irq(dev, irq, rockchip_pcie_subsys_irq_handler,
558 IRQF_SHARED, "pcie-sys", rockchip);
560 dev_err(dev, "failed to request PCIe subsystem IRQ\n");
564 irq = platform_get_irq_byname(pdev, "legacy");
566 dev_err(dev, "missing legacy IRQ resource\n");
570 irq_set_chained_handler_and_data(irq,
571 rockchip_pcie_legacy_int_handler,
574 irq = platform_get_irq_byname(pdev, "client");
576 dev_err(dev, "missing client IRQ resource\n");
580 err = devm_request_irq(dev, irq, rockchip_pcie_client_irq_handler,
581 IRQF_SHARED, "pcie-client", rockchip);
583 dev_err(dev, "failed to request PCIe client IRQ\n");
591 * rockchip_pcie_parse_host_dt - Parse Device Tree
592 * @rockchip: PCIe port information
594 * Return: '0' on success and error value on failure
596 static int rockchip_pcie_parse_host_dt(struct rockchip_pcie *rockchip)
598 struct device *dev = rockchip->dev;
601 err = rockchip_pcie_parse_dt(rockchip);
605 err = rockchip_pcie_setup_irq(rockchip);
609 rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v");
610 if (IS_ERR(rockchip->vpcie12v)) {
611 if (PTR_ERR(rockchip->vpcie12v) == -EPROBE_DEFER)
612 return -EPROBE_DEFER;
613 dev_info(dev, "no vpcie12v regulator found\n");
616 rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
617 if (IS_ERR(rockchip->vpcie3v3)) {
618 if (PTR_ERR(rockchip->vpcie3v3) == -EPROBE_DEFER)
619 return -EPROBE_DEFER;
620 dev_info(dev, "no vpcie3v3 regulator found\n");
623 rockchip->vpcie1v8 = devm_regulator_get_optional(dev, "vpcie1v8");
624 if (IS_ERR(rockchip->vpcie1v8)) {
625 if (PTR_ERR(rockchip->vpcie1v8) == -EPROBE_DEFER)
626 return -EPROBE_DEFER;
627 dev_info(dev, "no vpcie1v8 regulator found\n");
630 rockchip->vpcie0v9 = devm_regulator_get_optional(dev, "vpcie0v9");
631 if (IS_ERR(rockchip->vpcie0v9)) {
632 if (PTR_ERR(rockchip->vpcie0v9) == -EPROBE_DEFER)
633 return -EPROBE_DEFER;
634 dev_info(dev, "no vpcie0v9 regulator found\n");
640 static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
642 struct device *dev = rockchip->dev;
645 if (!IS_ERR(rockchip->vpcie12v)) {
646 err = regulator_enable(rockchip->vpcie12v);
648 dev_err(dev, "fail to enable vpcie12v regulator\n");
653 if (!IS_ERR(rockchip->vpcie3v3)) {
654 err = regulator_enable(rockchip->vpcie3v3);
656 dev_err(dev, "fail to enable vpcie3v3 regulator\n");
657 goto err_disable_12v;
661 if (!IS_ERR(rockchip->vpcie1v8)) {
662 err = regulator_enable(rockchip->vpcie1v8);
664 dev_err(dev, "fail to enable vpcie1v8 regulator\n");
665 goto err_disable_3v3;
669 if (!IS_ERR(rockchip->vpcie0v9)) {
670 err = regulator_enable(rockchip->vpcie0v9);
672 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
673 goto err_disable_1v8;
680 if (!IS_ERR(rockchip->vpcie1v8))
681 regulator_disable(rockchip->vpcie1v8);
683 if (!IS_ERR(rockchip->vpcie3v3))
684 regulator_disable(rockchip->vpcie3v3);
686 if (!IS_ERR(rockchip->vpcie12v))
687 regulator_disable(rockchip->vpcie12v);
692 static void rockchip_pcie_enable_interrupts(struct rockchip_pcie *rockchip)
694 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) &
695 (~PCIE_CLIENT_INT_CLI), PCIE_CLIENT_INT_MASK);
696 rockchip_pcie_write(rockchip, (u32)(~PCIE_CORE_INT),
699 rockchip_pcie_enable_bw_int(rockchip);
702 static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
703 irq_hw_number_t hwirq)
705 irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
706 irq_set_chip_data(irq, domain->host_data);
711 static const struct irq_domain_ops intx_domain_ops = {
712 .map = rockchip_pcie_intx_map,
715 static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip)
717 struct device *dev = rockchip->dev;
718 struct device_node *intc = of_get_next_child(dev->of_node, NULL);
721 dev_err(dev, "missing child interrupt-controller node\n");
725 rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX,
726 &intx_domain_ops, rockchip);
728 if (!rockchip->irq_domain) {
729 dev_err(dev, "failed to get a INTx IRQ domain\n");
736 static int rockchip_pcie_prog_ob_atu(struct rockchip_pcie *rockchip,
737 int region_no, int type, u8 num_pass_bits,
738 u32 lower_addr, u32 upper_addr)
745 if (region_no >= MAX_AXI_WRAPPER_REGION_NUM)
747 if (num_pass_bits + 1 < 8)
749 if (num_pass_bits > 63)
751 if (region_no == 0) {
752 if (AXI_REGION_0_SIZE < (2ULL << num_pass_bits))
755 if (region_no != 0) {
756 if (AXI_REGION_SIZE < (2ULL << num_pass_bits))
760 aw_offset = (region_no << OB_REG_SIZE_SHIFT);
762 ob_addr_0 = num_pass_bits & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS;
763 ob_addr_0 |= lower_addr & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR;
764 ob_addr_1 = upper_addr;
765 ob_desc_0 = (1 << 23 | type);
767 rockchip_pcie_write(rockchip, ob_addr_0,
768 PCIE_CORE_OB_REGION_ADDR0 + aw_offset);
769 rockchip_pcie_write(rockchip, ob_addr_1,
770 PCIE_CORE_OB_REGION_ADDR1 + aw_offset);
771 rockchip_pcie_write(rockchip, ob_desc_0,
772 PCIE_CORE_OB_REGION_DESC0 + aw_offset);
773 rockchip_pcie_write(rockchip, 0,
774 PCIE_CORE_OB_REGION_DESC1 + aw_offset);
779 static int rockchip_pcie_prog_ib_atu(struct rockchip_pcie *rockchip,
780 int region_no, u8 num_pass_bits,
781 u32 lower_addr, u32 upper_addr)
787 if (region_no > MAX_AXI_IB_ROOTPORT_REGION_NUM)
789 if (num_pass_bits + 1 < MIN_AXI_ADDR_BITS_PASSED)
791 if (num_pass_bits > 63)
794 aw_offset = (region_no << IB_ROOT_PORT_REG_SIZE_SHIFT);
796 ib_addr_0 = num_pass_bits & PCIE_CORE_IB_REGION_ADDR0_NUM_BITS;
797 ib_addr_0 |= (lower_addr << 8) & PCIE_CORE_IB_REGION_ADDR0_LO_ADDR;
798 ib_addr_1 = upper_addr;
800 rockchip_pcie_write(rockchip, ib_addr_0, PCIE_RP_IB_ADDR0 + aw_offset);
801 rockchip_pcie_write(rockchip, ib_addr_1, PCIE_RP_IB_ADDR1 + aw_offset);
806 static int rockchip_pcie_cfg_atu(struct rockchip_pcie *rockchip)
808 struct device *dev = rockchip->dev;
813 rockchip_pcie_cfg_configuration_accesses(rockchip,
814 AXI_WRAPPER_TYPE0_CFG);
816 for (reg_no = 0; reg_no < (rockchip->mem_size >> 20); reg_no++) {
817 err = rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1,
818 AXI_WRAPPER_MEM_WRITE,
820 rockchip->mem_bus_addr +
824 dev_err(dev, "program RC mem outbound ATU failed\n");
829 err = rockchip_pcie_prog_ib_atu(rockchip, 2, 32 - 1, 0x0, 0);
831 dev_err(dev, "program RC mem inbound ATU failed\n");
835 offset = rockchip->mem_size >> 20;
836 for (reg_no = 0; reg_no < (rockchip->io_size >> 20); reg_no++) {
837 err = rockchip_pcie_prog_ob_atu(rockchip,
839 AXI_WRAPPER_IO_WRITE,
841 rockchip->io_bus_addr +
845 dev_err(dev, "program RC io outbound ATU failed\n");
850 /* assign message regions */
851 rockchip_pcie_prog_ob_atu(rockchip, reg_no + 1 + offset,
855 rockchip->msg_bus_addr = rockchip->mem_bus_addr +
856 ((reg_no + offset) << 20);
860 static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip)
865 /* send PME_TURN_OFF message */
866 writel(0x0, rockchip->msg_region + PCIE_RC_SEND_PME_OFF);
868 /* read LTSSM and wait for falling into L2 link state */
869 err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_DEBUG_OUT_0,
870 value, PCIE_LINK_IS_L2(value), 20,
871 jiffies_to_usecs(5 * HZ));
873 dev_err(rockchip->dev, "PCIe link enter L2 timeout!\n");
880 static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
882 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
885 /* disable core and cli int since we don't need to ack PME_ACK */
886 rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
887 PCIE_CLIENT_INT_CLI, PCIE_CLIENT_INT_MASK);
888 rockchip_pcie_write(rockchip, (u32)PCIE_CORE_INT, PCIE_CORE_INT_MASK);
890 ret = rockchip_pcie_wait_l2(rockchip);
892 rockchip_pcie_enable_interrupts(rockchip);
896 rockchip_pcie_deinit_phys(rockchip);
898 rockchip_pcie_disable_clocks(rockchip);
900 if (!IS_ERR(rockchip->vpcie0v9))
901 regulator_disable(rockchip->vpcie0v9);
906 static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev)
908 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
911 if (!IS_ERR(rockchip->vpcie0v9)) {
912 err = regulator_enable(rockchip->vpcie0v9);
914 dev_err(dev, "fail to enable vpcie0v9 regulator\n");
919 err = rockchip_pcie_enable_clocks(rockchip);
921 goto err_disable_0v9;
923 err = rockchip_pcie_host_init_port(rockchip);
925 goto err_pcie_resume;
927 err = rockchip_pcie_cfg_atu(rockchip);
929 goto err_err_deinit_port;
931 /* Need this to enter L1 again */
932 rockchip_pcie_update_txcredit_mui(rockchip);
933 rockchip_pcie_enable_interrupts(rockchip);
938 rockchip_pcie_deinit_phys(rockchip);
940 rockchip_pcie_disable_clocks(rockchip);
942 if (!IS_ERR(rockchip->vpcie0v9))
943 regulator_disable(rockchip->vpcie0v9);
947 static int rockchip_pcie_probe(struct platform_device *pdev)
949 struct rockchip_pcie *rockchip;
950 struct device *dev = &pdev->dev;
951 struct pci_bus *bus, *child;
952 struct pci_host_bridge *bridge;
953 struct resource_entry *win;
954 resource_size_t io_base;
955 struct resource *mem;
964 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rockchip));
968 rockchip = pci_host_bridge_priv(bridge);
970 platform_set_drvdata(pdev, rockchip);
972 rockchip->is_rc = true;
974 err = rockchip_pcie_parse_host_dt(rockchip);
978 err = rockchip_pcie_enable_clocks(rockchip);
982 err = rockchip_pcie_set_vpcie(rockchip);
984 dev_err(dev, "failed to set vpcie regulator\n");
988 err = rockchip_pcie_host_init_port(rockchip);
992 rockchip_pcie_enable_interrupts(rockchip);
994 err = rockchip_pcie_init_irq_domain(rockchip);
996 goto err_deinit_port;
998 err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
1001 goto err_remove_irq_domain;
1003 err = devm_request_pci_bus_resources(dev, &res);
1007 /* Get the I/O and memory ranges from DT */
1008 resource_list_for_each_entry(win, &res) {
1009 switch (resource_type(win->res)) {
1013 rockchip->io_size = resource_size(io);
1014 rockchip->io_bus_addr = io->start - win->offset;
1015 err = pci_remap_iospace(io, io_base);
1017 dev_warn(dev, "error %d: failed to map resource %pR\n",
1023 case IORESOURCE_MEM:
1026 rockchip->mem_size = resource_size(mem);
1027 rockchip->mem_bus_addr = mem->start - win->offset;
1029 case IORESOURCE_BUS:
1030 rockchip->root_bus_nr = win->res->start;
1037 err = rockchip_pcie_cfg_atu(rockchip);
1039 goto err_unmap_iospace;
1041 rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M);
1042 if (!rockchip->msg_region) {
1044 goto err_unmap_iospace;
1047 list_splice_init(&res, &bridge->windows);
1048 bridge->dev.parent = dev;
1049 bridge->sysdata = rockchip;
1051 bridge->ops = &rockchip_pcie_ops;
1052 bridge->map_irq = of_irq_parse_and_map_pci;
1053 bridge->swizzle_irq = pci_common_swizzle;
1055 err = pci_scan_root_bus_bridge(bridge);
1057 goto err_unmap_iospace;
1061 rockchip->root_bus = bus;
1063 pci_bus_size_bridges(bus);
1064 pci_bus_assign_resources(bus);
1065 list_for_each_entry(child, &bus->children, node)
1066 pcie_bus_configure_settings(child);
1068 pci_bus_add_devices(bus);
1072 pci_unmap_iospace(rockchip->io);
1074 pci_free_resource_list(&res);
1075 err_remove_irq_domain:
1076 irq_domain_remove(rockchip->irq_domain);
1078 rockchip_pcie_deinit_phys(rockchip);
1080 if (!IS_ERR(rockchip->vpcie12v))
1081 regulator_disable(rockchip->vpcie12v);
1082 if (!IS_ERR(rockchip->vpcie3v3))
1083 regulator_disable(rockchip->vpcie3v3);
1084 if (!IS_ERR(rockchip->vpcie1v8))
1085 regulator_disable(rockchip->vpcie1v8);
1086 if (!IS_ERR(rockchip->vpcie0v9))
1087 regulator_disable(rockchip->vpcie0v9);
1089 rockchip_pcie_disable_clocks(rockchip);
1093 static int rockchip_pcie_remove(struct platform_device *pdev)
1095 struct device *dev = &pdev->dev;
1096 struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
1098 pci_stop_root_bus(rockchip->root_bus);
1099 pci_remove_root_bus(rockchip->root_bus);
1100 pci_unmap_iospace(rockchip->io);
1101 irq_domain_remove(rockchip->irq_domain);
1103 rockchip_pcie_deinit_phys(rockchip);
1105 rockchip_pcie_disable_clocks(rockchip);
1107 if (!IS_ERR(rockchip->vpcie12v))
1108 regulator_disable(rockchip->vpcie12v);
1109 if (!IS_ERR(rockchip->vpcie3v3))
1110 regulator_disable(rockchip->vpcie3v3);
1111 if (!IS_ERR(rockchip->vpcie1v8))
1112 regulator_disable(rockchip->vpcie1v8);
1113 if (!IS_ERR(rockchip->vpcie0v9))
1114 regulator_disable(rockchip->vpcie0v9);
1119 static const struct dev_pm_ops rockchip_pcie_pm_ops = {
1120 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq,
1121 rockchip_pcie_resume_noirq)
1124 static const struct of_device_id rockchip_pcie_of_match[] = {
1125 { .compatible = "rockchip,rk3399-pcie", },
1128 MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match);
1130 static struct platform_driver rockchip_pcie_driver = {
1132 .name = "rockchip-pcie",
1133 .of_match_table = rockchip_pcie_of_match,
1134 .pm = &rockchip_pcie_pm_ops,
1136 .probe = rockchip_pcie_probe,
1137 .remove = rockchip_pcie_remove,
1139 module_platform_driver(rockchip_pcie_driver);
1141 MODULE_AUTHOR("Rockchip Inc");
1142 MODULE_DESCRIPTION("Rockchip AXI PCIe driver");
1143 MODULE_LICENSE("GPL v2");