1 // SPDX-License-Identifier: GPL-2.0+
3 * PCIe host controller driver for NWL PCIe Bridge
4 * Based on pcie-xilinx.c, pci-tegra.c
6 * (C) Copyright 2014 - 2015, Xilinx, Inc.
9 #include <linux/delay.h>
10 #include <linux/interrupt.h>
11 #include <linux/irq.h>
12 #include <linux/irqdomain.h>
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/msi.h>
16 #include <linux/of_address.h>
17 #include <linux/of_pci.h>
18 #include <linux/of_platform.h>
19 #include <linux/of_irq.h>
20 #include <linux/pci.h>
21 #include <linux/pci-ecam.h>
22 #include <linux/platform_device.h>
23 #include <linux/irqchip/chained_irq.h>
27 /* Bridge core config registers */
28 #define BRCFG_PCIE_RX0 0x00000000
29 #define BRCFG_INTERRUPT 0x00000010
30 #define BRCFG_PCIE_RX_MSG_FILTER 0x00000020
32 /* Egress - Bridge translation registers */
33 #define E_BREG_CAPABILITIES 0x00000200
34 #define E_BREG_CONTROL 0x00000208
35 #define E_BREG_BASE_LO 0x00000210
36 #define E_BREG_BASE_HI 0x00000214
37 #define E_ECAM_CAPABILITIES 0x00000220
38 #define E_ECAM_CONTROL 0x00000228
39 #define E_ECAM_BASE_LO 0x00000230
40 #define E_ECAM_BASE_HI 0x00000234
42 /* Ingress - address translations */
43 #define I_MSII_CAPABILITIES 0x00000300
44 #define I_MSII_CONTROL 0x00000308
45 #define I_MSII_BASE_LO 0x00000310
46 #define I_MSII_BASE_HI 0x00000314
48 #define I_ISUB_CONTROL 0x000003E8
49 #define SET_ISUB_CONTROL BIT(0)
50 /* Rxed msg fifo - Interrupt status registers */
51 #define MSGF_MISC_STATUS 0x00000400
52 #define MSGF_MISC_MASK 0x00000404
53 #define MSGF_LEG_STATUS 0x00000420
54 #define MSGF_LEG_MASK 0x00000424
55 #define MSGF_MSI_STATUS_LO 0x00000440
56 #define MSGF_MSI_STATUS_HI 0x00000444
57 #define MSGF_MSI_MASK_LO 0x00000448
58 #define MSGF_MSI_MASK_HI 0x0000044C
60 /* Msg filter mask bits */
61 #define CFG_ENABLE_PM_MSG_FWD BIT(1)
62 #define CFG_ENABLE_INT_MSG_FWD BIT(2)
63 #define CFG_ENABLE_ERR_MSG_FWD BIT(3)
64 #define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \
65 CFG_ENABLE_INT_MSG_FWD | \
66 CFG_ENABLE_ERR_MSG_FWD)
68 /* Misc interrupt status mask bits */
69 #define MSGF_MISC_SR_RXMSG_AVAIL BIT(0)
70 #define MSGF_MISC_SR_RXMSG_OVER BIT(1)
71 #define MSGF_MISC_SR_SLAVE_ERR BIT(4)
72 #define MSGF_MISC_SR_MASTER_ERR BIT(5)
73 #define MSGF_MISC_SR_I_ADDR_ERR BIT(6)
74 #define MSGF_MISC_SR_E_ADDR_ERR BIT(7)
75 #define MSGF_MISC_SR_FATAL_AER BIT(16)
76 #define MSGF_MISC_SR_NON_FATAL_AER BIT(17)
77 #define MSGF_MISC_SR_CORR_AER BIT(18)
78 #define MSGF_MISC_SR_UR_DETECT BIT(20)
79 #define MSGF_MISC_SR_NON_FATAL_DEV BIT(22)
80 #define MSGF_MISC_SR_FATAL_DEV BIT(23)
81 #define MSGF_MISC_SR_LINK_DOWN BIT(24)
82 #define MSGF_MSIC_SR_LINK_AUTO_BWIDTH BIT(25)
83 #define MSGF_MSIC_SR_LINK_BWIDTH BIT(26)
85 #define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \
86 MSGF_MISC_SR_RXMSG_OVER | \
87 MSGF_MISC_SR_SLAVE_ERR | \
88 MSGF_MISC_SR_MASTER_ERR | \
89 MSGF_MISC_SR_I_ADDR_ERR | \
90 MSGF_MISC_SR_E_ADDR_ERR | \
91 MSGF_MISC_SR_FATAL_AER | \
92 MSGF_MISC_SR_NON_FATAL_AER | \
93 MSGF_MISC_SR_CORR_AER | \
94 MSGF_MISC_SR_UR_DETECT | \
95 MSGF_MISC_SR_NON_FATAL_DEV | \
96 MSGF_MISC_SR_FATAL_DEV | \
97 MSGF_MISC_SR_LINK_DOWN | \
98 MSGF_MSIC_SR_LINK_AUTO_BWIDTH | \
99 MSGF_MSIC_SR_LINK_BWIDTH)
101 /* Legacy interrupt status mask bits */
102 #define MSGF_LEG_SR_INTA BIT(0)
103 #define MSGF_LEG_SR_INTB BIT(1)
104 #define MSGF_LEG_SR_INTC BIT(2)
105 #define MSGF_LEG_SR_INTD BIT(3)
106 #define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \
107 MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD)
109 /* MSI interrupt status mask bits */
110 #define MSGF_MSI_SR_LO_MASK GENMASK(31, 0)
111 #define MSGF_MSI_SR_HI_MASK GENMASK(31, 0)
113 #define MSII_PRESENT BIT(0)
114 #define MSII_ENABLE BIT(0)
115 #define MSII_STATUS_ENABLE BIT(15)
117 /* Bridge config interrupt mask */
118 #define BRCFG_INTERRUPT_MASK BIT(0)
119 #define BREG_PRESENT BIT(0)
120 #define BREG_ENABLE BIT(0)
121 #define BREG_ENABLE_FORCE BIT(1)
123 /* E_ECAM status mask bits */
124 #define E_ECAM_PRESENT BIT(0)
125 #define E_ECAM_CR_ENABLE BIT(0)
126 #define E_ECAM_SIZE_LOC GENMASK(20, 16)
127 #define E_ECAM_SIZE_SHIFT 16
128 #define NWL_ECAM_VALUE_DEFAULT 12
130 #define CFG_DMA_REG_BAR GENMASK(2, 0)
132 #define INT_PCI_MSI_NR (2 * 32)
134 /* Readin the PS_LINKUP */
135 #define PS_LINKUP_OFFSET 0x00000238
136 #define PCIE_PHY_LINKUP_BIT BIT(0)
137 #define PHY_RDY_LINKUP_BIT BIT(1)
139 /* Parameters for the waiting for link up routine */
140 #define LINK_WAIT_MAX_RETRIES 10
141 #define LINK_WAIT_USLEEP_MIN 90000
142 #define LINK_WAIT_USLEEP_MAX 100000
144 struct nwl_msi { /* MSI information */
145 struct irq_domain *msi_domain;
146 unsigned long *bitmap;
147 struct irq_domain *dev_domain;
148 struct mutex lock; /* protect bitmap variable */
155 void __iomem *breg_base;
156 void __iomem *pcireg_base;
157 void __iomem *ecam_base;
158 phys_addr_t phys_breg_base; /* Physical Bridge Register Base */
159 phys_addr_t phys_pcie_reg_base; /* Physical PCIe Controller Base */
160 phys_addr_t phys_ecam_base; /* Physical Configuration Base */
169 struct irq_domain *legacy_irq_domain;
170 raw_spinlock_t leg_mask_lock;
173 static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off)
175 return readl(pcie->breg_base + off);
178 static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off)
180 writel(val, pcie->breg_base + off);
183 static bool nwl_pcie_link_up(struct nwl_pcie *pcie)
185 if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PCIE_PHY_LINKUP_BIT)
190 static bool nwl_phy_link_up(struct nwl_pcie *pcie)
192 if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PHY_RDY_LINKUP_BIT)
197 static int nwl_wait_for_link(struct nwl_pcie *pcie)
199 struct device *dev = pcie->dev;
202 /* check if the link is up or not */
203 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
204 if (nwl_phy_link_up(pcie))
206 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
209 dev_err(dev, "PHY link never came up\n");
213 static bool nwl_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
215 struct nwl_pcie *pcie = bus->sysdata;
217 /* Check link before accessing downstream ports */
218 if (!pci_is_root_bus(bus)) {
219 if (!nwl_pcie_link_up(pcie))
221 } else if (devfn > 0)
222 /* Only one device down on each root port */
229 * nwl_pcie_map_bus - Get configuration base
231 * @bus: Bus structure of current bus
232 * @devfn: Device/function
233 * @where: Offset from base
235 * Return: Base address of the configuration space needed to be
238 static void __iomem *nwl_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
241 struct nwl_pcie *pcie = bus->sysdata;
243 if (!nwl_pcie_valid_device(bus, devfn))
246 return pcie->ecam_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
249 /* PCIe operations */
250 static struct pci_ops nwl_pcie_ops = {
251 .map_bus = nwl_pcie_map_bus,
252 .read = pci_generic_config_read,
253 .write = pci_generic_config_write,
256 static irqreturn_t nwl_pcie_misc_handler(int irq, void *data)
258 struct nwl_pcie *pcie = data;
259 struct device *dev = pcie->dev;
262 /* Checking for misc interrupts */
263 misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
264 MSGF_MISC_SR_MASKALL;
268 if (misc_stat & MSGF_MISC_SR_RXMSG_OVER)
269 dev_err(dev, "Received Message FIFO Overflow\n");
271 if (misc_stat & MSGF_MISC_SR_SLAVE_ERR)
272 dev_err(dev, "Slave error\n");
274 if (misc_stat & MSGF_MISC_SR_MASTER_ERR)
275 dev_err(dev, "Master error\n");
277 if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR)
278 dev_err(dev, "In Misc Ingress address translation error\n");
280 if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR)
281 dev_err(dev, "In Misc Egress address translation error\n");
283 if (misc_stat & MSGF_MISC_SR_FATAL_AER)
284 dev_err(dev, "Fatal Error in AER Capability\n");
286 if (misc_stat & MSGF_MISC_SR_NON_FATAL_AER)
287 dev_err(dev, "Non-Fatal Error in AER Capability\n");
289 if (misc_stat & MSGF_MISC_SR_CORR_AER)
290 dev_err(dev, "Correctable Error in AER Capability\n");
292 if (misc_stat & MSGF_MISC_SR_UR_DETECT)
293 dev_err(dev, "Unsupported request Detected\n");
295 if (misc_stat & MSGF_MISC_SR_NON_FATAL_DEV)
296 dev_err(dev, "Non-Fatal Error Detected\n");
298 if (misc_stat & MSGF_MISC_SR_FATAL_DEV)
299 dev_err(dev, "Fatal Error Detected\n");
301 if (misc_stat & MSGF_MSIC_SR_LINK_AUTO_BWIDTH)
302 dev_info(dev, "Link Autonomous Bandwidth Management Status bit set\n");
304 if (misc_stat & MSGF_MSIC_SR_LINK_BWIDTH)
305 dev_info(dev, "Link Bandwidth Management Status bit set\n");
307 /* Clear misc interrupt status */
308 nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS);
313 static void nwl_pcie_leg_handler(struct irq_desc *desc)
315 struct irq_chip *chip = irq_desc_get_chip(desc);
316 struct nwl_pcie *pcie;
317 unsigned long status;
321 chained_irq_enter(chip, desc);
322 pcie = irq_desc_get_handler_data(desc);
324 while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
325 MSGF_LEG_SR_MASKALL) != 0) {
326 for_each_set_bit(bit, &status, PCI_NUM_INTX) {
327 virq = irq_find_mapping(pcie->legacy_irq_domain, bit);
329 generic_handle_irq(virq);
333 chained_irq_exit(chip, desc);
336 static void nwl_pcie_handle_msi_irq(struct nwl_pcie *pcie, u32 status_reg)
339 unsigned long status;
345 while ((status = nwl_bridge_readl(pcie, status_reg)) != 0) {
346 for_each_set_bit(bit, &status, 32) {
347 nwl_bridge_writel(pcie, 1 << bit, status_reg);
348 virq = irq_find_mapping(msi->dev_domain, bit);
350 generic_handle_irq(virq);
355 static void nwl_pcie_msi_handler_high(struct irq_desc *desc)
357 struct irq_chip *chip = irq_desc_get_chip(desc);
358 struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
360 chained_irq_enter(chip, desc);
361 nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_HI);
362 chained_irq_exit(chip, desc);
365 static void nwl_pcie_msi_handler_low(struct irq_desc *desc)
367 struct irq_chip *chip = irq_desc_get_chip(desc);
368 struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
370 chained_irq_enter(chip, desc);
371 nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_LO);
372 chained_irq_exit(chip, desc);
375 static void nwl_mask_leg_irq(struct irq_data *data)
377 struct irq_desc *desc = irq_to_desc(data->irq);
378 struct nwl_pcie *pcie;
383 pcie = irq_desc_get_chip_data(desc);
384 mask = 1 << (data->hwirq - 1);
385 raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
386 val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
387 nwl_bridge_writel(pcie, (val & (~mask)), MSGF_LEG_MASK);
388 raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
391 static void nwl_unmask_leg_irq(struct irq_data *data)
393 struct irq_desc *desc = irq_to_desc(data->irq);
394 struct nwl_pcie *pcie;
399 pcie = irq_desc_get_chip_data(desc);
400 mask = 1 << (data->hwirq - 1);
401 raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
402 val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
403 nwl_bridge_writel(pcie, (val | mask), MSGF_LEG_MASK);
404 raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
407 static struct irq_chip nwl_leg_irq_chip = {
408 .name = "nwl_pcie:legacy",
409 .irq_enable = nwl_unmask_leg_irq,
410 .irq_disable = nwl_mask_leg_irq,
411 .irq_mask = nwl_mask_leg_irq,
412 .irq_unmask = nwl_unmask_leg_irq,
415 static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq,
416 irq_hw_number_t hwirq)
418 irq_set_chip_and_handler(irq, &nwl_leg_irq_chip, handle_level_irq);
419 irq_set_chip_data(irq, domain->host_data);
420 irq_set_status_flags(irq, IRQ_LEVEL);
425 static const struct irq_domain_ops legacy_domain_ops = {
426 .map = nwl_legacy_map,
427 .xlate = pci_irqd_intx_xlate,
430 #ifdef CONFIG_PCI_MSI
431 static struct irq_chip nwl_msi_irq_chip = {
432 .name = "nwl_pcie:msi",
433 .irq_enable = pci_msi_unmask_irq,
434 .irq_disable = pci_msi_mask_irq,
435 .irq_mask = pci_msi_mask_irq,
436 .irq_unmask = pci_msi_unmask_irq,
439 static struct msi_domain_info nwl_msi_domain_info = {
440 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
441 MSI_FLAG_MULTI_PCI_MSI),
442 .chip = &nwl_msi_irq_chip,
446 static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
448 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
449 phys_addr_t msi_addr = pcie->phys_pcie_reg_base;
451 msg->address_lo = lower_32_bits(msi_addr);
452 msg->address_hi = upper_32_bits(msi_addr);
453 msg->data = data->hwirq;
456 static int nwl_msi_set_affinity(struct irq_data *irq_data,
457 const struct cpumask *mask, bool force)
462 static struct irq_chip nwl_irq_chip = {
463 .name = "Xilinx MSI",
464 .irq_compose_msi_msg = nwl_compose_msi_msg,
465 .irq_set_affinity = nwl_msi_set_affinity,
468 static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
469 unsigned int nr_irqs, void *args)
471 struct nwl_pcie *pcie = domain->host_data;
472 struct nwl_msi *msi = &pcie->msi;
476 mutex_lock(&msi->lock);
477 bit = bitmap_find_free_region(msi->bitmap, INT_PCI_MSI_NR,
478 get_count_order(nr_irqs));
480 mutex_unlock(&msi->lock);
484 for (i = 0; i < nr_irqs; i++) {
485 irq_domain_set_info(domain, virq + i, bit + i, &nwl_irq_chip,
486 domain->host_data, handle_simple_irq,
489 mutex_unlock(&msi->lock);
493 static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq,
494 unsigned int nr_irqs)
496 struct irq_data *data = irq_domain_get_irq_data(domain, virq);
497 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
498 struct nwl_msi *msi = &pcie->msi;
500 mutex_lock(&msi->lock);
501 bitmap_release_region(msi->bitmap, data->hwirq,
502 get_count_order(nr_irqs));
503 mutex_unlock(&msi->lock);
506 static const struct irq_domain_ops dev_msi_domain_ops = {
507 .alloc = nwl_irq_domain_alloc,
508 .free = nwl_irq_domain_free,
511 static int nwl_pcie_init_msi_irq_domain(struct nwl_pcie *pcie)
513 #ifdef CONFIG_PCI_MSI
514 struct device *dev = pcie->dev;
515 struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
516 struct nwl_msi *msi = &pcie->msi;
518 msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR,
519 &dev_msi_domain_ops, pcie);
520 if (!msi->dev_domain) {
521 dev_err(dev, "failed to create dev IRQ domain\n");
524 msi->msi_domain = pci_msi_create_irq_domain(fwnode,
525 &nwl_msi_domain_info,
527 if (!msi->msi_domain) {
528 dev_err(dev, "failed to create msi IRQ domain\n");
529 irq_domain_remove(msi->dev_domain);
536 static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie)
538 struct device *dev = pcie->dev;
539 struct device_node *node = dev->of_node;
540 struct device_node *legacy_intc_node;
542 legacy_intc_node = of_get_next_child(node, NULL);
543 if (!legacy_intc_node) {
544 dev_err(dev, "No legacy intc node found\n");
548 pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node,
552 of_node_put(legacy_intc_node);
553 if (!pcie->legacy_irq_domain) {
554 dev_err(dev, "failed to create IRQ domain\n");
558 raw_spin_lock_init(&pcie->leg_mask_lock);
559 nwl_pcie_init_msi_irq_domain(pcie);
563 static int nwl_pcie_enable_msi(struct nwl_pcie *pcie)
565 struct device *dev = pcie->dev;
566 struct platform_device *pdev = to_platform_device(dev);
567 struct nwl_msi *msi = &pcie->msi;
570 int size = BITS_TO_LONGS(INT_PCI_MSI_NR) * sizeof(long);
572 mutex_init(&msi->lock);
574 msi->bitmap = kzalloc(size, GFP_KERNEL);
578 /* Get msi_1 IRQ number */
579 msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1");
580 if (msi->irq_msi1 < 0) {
585 irq_set_chained_handler_and_data(msi->irq_msi1,
586 nwl_pcie_msi_handler_high, pcie);
588 /* Get msi_0 IRQ number */
589 msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0");
590 if (msi->irq_msi0 < 0) {
595 irq_set_chained_handler_and_data(msi->irq_msi0,
596 nwl_pcie_msi_handler_low, pcie);
598 /* Check for msii_present bit */
599 ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT;
601 dev_err(dev, "MSI not present\n");
607 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
608 MSII_ENABLE, I_MSII_CONTROL);
610 /* Enable MSII status */
611 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
612 MSII_STATUS_ENABLE, I_MSII_CONTROL);
614 /* setup AFI/FPCI range */
615 base = pcie->phys_pcie_reg_base;
616 nwl_bridge_writel(pcie, lower_32_bits(base), I_MSII_BASE_LO);
617 nwl_bridge_writel(pcie, upper_32_bits(base), I_MSII_BASE_HI);
620 * For high range MSI interrupts: disable, clear any pending,
623 nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_HI);
625 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) &
626 MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI);
628 nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI);
631 * For low range MSI interrupts: disable, clear any pending,
634 nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_LO);
636 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) &
637 MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO);
639 nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO);
648 static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
650 struct device *dev = pcie->dev;
651 struct platform_device *pdev = to_platform_device(dev);
652 u32 breg_val, ecam_val, first_busno = 0;
655 breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT;
657 dev_err(dev, "BREG is not present\n");
661 /* Write bridge_off to breg base */
662 nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_breg_base),
664 nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_breg_base),
668 nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE,
671 /* Disable DMA channel registers */
672 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) |
673 CFG_DMA_REG_BAR, BRCFG_PCIE_RX0);
675 /* Enable Ingress subtractive decode translation */
676 nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL);
678 /* Enable msg filtering details */
679 nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK,
680 BRCFG_PCIE_RX_MSG_FILTER);
682 err = nwl_wait_for_link(pcie);
686 ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT;
688 dev_err(dev, "ECAM is not present\n");
693 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
694 E_ECAM_CR_ENABLE, E_ECAM_CONTROL);
696 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
697 (pcie->ecam_value << E_ECAM_SIZE_SHIFT),
700 nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_ecam_base),
702 nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_ecam_base),
706 ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL);
707 pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT;
708 /* Write primary, secondary and subordinate bus numbers */
709 ecam_val = first_busno;
710 ecam_val |= (first_busno + 1) << 8;
711 ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT);
712 writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS));
714 if (nwl_pcie_link_up(pcie))
715 dev_info(dev, "Link is UP\n");
717 dev_info(dev, "Link is DOWN\n");
719 /* Get misc IRQ number */
720 pcie->irq_misc = platform_get_irq_byname(pdev, "misc");
721 if (pcie->irq_misc < 0)
724 err = devm_request_irq(dev, pcie->irq_misc,
725 nwl_pcie_misc_handler, IRQF_SHARED,
726 "nwl_pcie:misc", pcie);
728 dev_err(dev, "fail to register misc IRQ#%d\n",
733 /* Disable all misc interrupts */
734 nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
736 /* Clear pending misc interrupts */
737 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
738 MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS);
740 /* Enable all misc interrupts */
741 nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
744 /* Disable all legacy interrupts */
745 nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
747 /* Clear pending legacy interrupts */
748 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
749 MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS);
751 /* Enable all legacy interrupts */
752 nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
754 /* Enable the bridge config interrupt */
755 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) |
756 BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT);
761 static int nwl_pcie_parse_dt(struct nwl_pcie *pcie,
762 struct platform_device *pdev)
764 struct device *dev = pcie->dev;
765 struct resource *res;
767 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
768 pcie->breg_base = devm_ioremap_resource(dev, res);
769 if (IS_ERR(pcie->breg_base))
770 return PTR_ERR(pcie->breg_base);
771 pcie->phys_breg_base = res->start;
773 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg");
774 pcie->pcireg_base = devm_ioremap_resource(dev, res);
775 if (IS_ERR(pcie->pcireg_base))
776 return PTR_ERR(pcie->pcireg_base);
777 pcie->phys_pcie_reg_base = res->start;
779 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
780 pcie->ecam_base = devm_pci_remap_cfg_resource(dev, res);
781 if (IS_ERR(pcie->ecam_base))
782 return PTR_ERR(pcie->ecam_base);
783 pcie->phys_ecam_base = res->start;
785 /* Get intx IRQ number */
786 pcie->irq_intx = platform_get_irq_byname(pdev, "intx");
787 if (pcie->irq_intx < 0)
788 return pcie->irq_intx;
790 irq_set_chained_handler_and_data(pcie->irq_intx,
791 nwl_pcie_leg_handler, pcie);
796 static const struct of_device_id nwl_pcie_of_match[] = {
797 { .compatible = "xlnx,nwl-pcie-2.11", },
801 static int nwl_pcie_probe(struct platform_device *pdev)
803 struct device *dev = &pdev->dev;
804 struct nwl_pcie *pcie;
805 struct pci_host_bridge *bridge;
808 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
812 pcie = pci_host_bridge_priv(bridge);
815 pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT;
817 err = nwl_pcie_parse_dt(pcie, pdev);
819 dev_err(dev, "Parsing DT failed\n");
823 err = nwl_pcie_bridge_init(pcie);
825 dev_err(dev, "HW Initialization failed\n");
829 err = nwl_pcie_init_irq_domain(pcie);
831 dev_err(dev, "Failed creating IRQ Domain\n");
835 bridge->sysdata = pcie;
836 bridge->ops = &nwl_pcie_ops;
838 if (IS_ENABLED(CONFIG_PCI_MSI)) {
839 err = nwl_pcie_enable_msi(pcie);
841 dev_err(dev, "failed to enable MSI support: %d\n", err);
846 return pci_host_probe(bridge);
849 static struct platform_driver nwl_pcie_driver = {
852 .suppress_bind_attrs = true,
853 .of_match_table = nwl_pcie_of_match,
855 .probe = nwl_pcie_probe,
857 builtin_platform_driver(nwl_pcie_driver);