1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2007-2011 Freescale Semiconductor, Inc.
5 * Author: Tony Li <tony.li@freescale.com>
6 * Jason Jin <Jason.jin@freescale.com>
8 * The hwirq alloc and free code reuse from sysdev/mpic_msi.c
10 #include <linux/irq.h>
11 #include <linux/msi.h>
12 #include <linux/pci.h>
13 #include <linux/slab.h>
15 #include <linux/of_address.h>
16 #include <linux/of_irq.h>
17 #include <linux/platform_device.h>
18 #include <linux/property.h>
19 #include <linux/interrupt.h>
20 #include <linux/irqdomain.h>
21 #include <linux/seq_file.h>
22 #include <sysdev/fsl_soc.h>
23 #include <asm/hw_irq.h>
24 #include <asm/ppc-pci.h>
26 #include <asm/fsl_hcalls.h>
31 #define MSIIR_OFFSET_MASK 0xfffff
32 #define MSIIR_IBS_SHIFT 0
33 #define MSIIR_SRS_SHIFT 5
34 #define MSIIR1_IBS_SHIFT 4
35 #define MSIIR1_SRS_SHIFT 0
36 #define MSI_SRS_MASK 0xf
37 #define MSI_IBS_MASK 0x1f
39 #define msi_hwirq(msi, msir_index, intr_index) \
40 ((msir_index) << (msi)->srs_shift | \
41 ((intr_index) << (msi)->ibs_shift))
43 static LIST_HEAD(msi_head);
45 struct fsl_msi_feature {
47 u32 msiir_offset; /* Offset of MSIIR, relative to start of MSIR bank */
50 struct fsl_msi_cascade_data {
51 struct fsl_msi *msi_data;
56 static inline u32 fsl_msi_read(u32 __iomem *base, unsigned int reg)
58 return in_be32(base + (reg >> 2));
62 * We do not need this actually. The MSIR register has been read once
63 * in the cascade interrupt. So, this MSI interrupt has been acked
65 static void fsl_msi_end_irq(struct irq_data *d)
69 static void fsl_msi_print_chip(struct irq_data *irqd, struct seq_file *p)
71 struct fsl_msi *msi_data = irqd->domain->host_data;
72 irq_hw_number_t hwirq = irqd_to_hwirq(irqd);
73 int cascade_virq, srs;
75 srs = (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK;
76 cascade_virq = msi_data->cascade_array[srs]->virq;
78 seq_printf(p, " fsl-msi-%d", cascade_virq);
82 static struct irq_chip fsl_msi_chip = {
83 .irq_mask = pci_msi_mask_irq,
84 .irq_unmask = pci_msi_unmask_irq,
85 .irq_ack = fsl_msi_end_irq,
86 .irq_print_chip = fsl_msi_print_chip,
89 static int fsl_msi_host_map(struct irq_domain *h, unsigned int virq,
92 struct fsl_msi *msi_data = h->host_data;
93 struct irq_chip *chip = &fsl_msi_chip;
95 irq_set_status_flags(virq, IRQ_TYPE_EDGE_FALLING);
97 irq_set_chip_data(virq, msi_data);
98 irq_set_chip_and_handler(virq, chip, handle_edge_irq);
103 static const struct irq_domain_ops fsl_msi_host_ops = {
104 .map = fsl_msi_host_map,
107 static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
111 rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS_MAX,
112 irq_domain_get_of_node(msi_data->irqhost));
117 * Reserve all the hwirqs
118 * The available hwirqs will be released in fsl_msi_setup_hwirq()
120 for (hwirq = 0; hwirq < NR_MSI_IRQS_MAX; hwirq++)
121 msi_bitmap_reserve_hwirq(&msi_data->bitmap, hwirq);
126 static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
128 struct msi_desc *entry;
129 struct fsl_msi *msi_data;
130 irq_hw_number_t hwirq;
132 msi_for_each_desc(entry, &pdev->dev, MSI_DESC_ASSOCIATED) {
133 hwirq = virq_to_hw(entry->irq);
134 msi_data = irq_get_chip_data(entry->irq);
135 irq_set_msi_desc(entry->irq, NULL);
136 irq_dispose_mapping(entry->irq);
138 msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
142 static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
144 struct fsl_msi *fsl_msi_data)
146 struct fsl_msi *msi_data = fsl_msi_data;
147 struct pci_controller *hose = pci_bus_to_host(pdev->bus);
148 u64 address; /* Physical address of the MSIIR */
152 /* If the msi-address-64 property exists, then use it */
153 reg = of_get_property(hose->dn, "msi-address-64", &len);
154 if (reg && (len == sizeof(u64)))
155 address = be64_to_cpup(reg);
157 address = fsl_pci_immrbar_base(hose) + msi_data->msiir_offset;
159 msg->address_lo = lower_32_bits(address);
160 msg->address_hi = upper_32_bits(address);
163 * MPIC version 2.0 has erratum PIC1. It causes
164 * that neither MSI nor MSI-X can work fine.
165 * This is a workaround to allow MSI-X to function
166 * properly. It only works for MSI-X, we prevent
167 * MSI on buggy chips in fsl_setup_msi_irqs().
169 if (msi_data->feature & MSI_HW_ERRATA_ENDIAN)
170 msg->data = __swab32(hwirq);
174 pr_debug("%s: allocated srs: %d, ibs: %d\n", __func__,
175 (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK,
176 (hwirq >> msi_data->ibs_shift) & MSI_IBS_MASK);
179 static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
181 struct pci_controller *hose = pci_bus_to_host(pdev->bus);
182 struct device_node *np;
184 int rc, hwirq = -ENOMEM;
186 struct msi_desc *entry;
188 struct fsl_msi *msi_data;
190 if (type == PCI_CAP_ID_MSI) {
192 * MPIC version 2.0 has erratum PIC1. For now MSI
193 * could not work. So check to prevent MSI from
194 * being used on the board with this erratum.
196 list_for_each_entry(msi_data, &msi_head, list)
197 if (msi_data->feature & MSI_HW_ERRATA_ENDIAN)
202 * If the PCI node has an fsl,msi property, then we need to use it
203 * to find the specific MSI.
205 np = of_parse_phandle(hose->dn, "fsl,msi", 0);
207 if (of_device_is_compatible(np, "fsl,mpic-msi") ||
208 of_device_is_compatible(np, "fsl,vmpic-msi") ||
209 of_device_is_compatible(np, "fsl,vmpic-msi-v4.3"))
210 phandle = np->phandle;
213 "node %pOF has an invalid fsl,msi phandle %u\n",
214 hose->dn, np->phandle);
221 msi_for_each_desc(entry, &pdev->dev, MSI_DESC_NOTASSOCIATED) {
223 * Loop over all the MSI devices until we find one that has an
224 * available interrupt.
226 list_for_each_entry(msi_data, &msi_head, list) {
228 * If the PCI node has an fsl,msi property, then we
229 * restrict our search to the corresponding MSI node.
230 * The simplest way is to skip over MSI nodes with the
231 * wrong phandle. Under the Freescale hypervisor, this
232 * has the additional benefit of skipping over MSI
233 * nodes that are not mapped in the PAMU.
235 if (phandle && (phandle != msi_data->phandle))
238 hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
245 dev_err(&pdev->dev, "could not allocate MSI interrupt\n");
249 virq = irq_create_mapping(msi_data->irqhost, hwirq);
252 dev_err(&pdev->dev, "fail mapping hwirq %i\n", hwirq);
253 msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
257 /* chip_data is msi_data via host->hostdata in host->map() */
258 irq_set_msi_desc(virq, entry);
260 fsl_compose_msi_msg(pdev, hwirq, &msg, msi_data);
261 pci_write_msi_msg(virq, &msg);
266 /* free by the caller of this function */
270 static irqreturn_t fsl_msi_cascade(int irq, void *data)
272 struct fsl_msi *msi_data;
277 struct fsl_msi_cascade_data *cascade_data = data;
278 irqreturn_t ret = IRQ_NONE;
280 msi_data = cascade_data->msi_data;
282 msir_index = cascade_data->index;
284 switch (msi_data->feature & FSL_PIC_IP_MASK) {
285 case FSL_PIC_IP_MPIC:
286 msir_value = fsl_msi_read(msi_data->msi_regs,
289 case FSL_PIC_IP_IPIC:
290 msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4);
292 #ifdef CONFIG_EPAPR_PARAVIRT
293 case FSL_PIC_IP_VMPIC: {
295 ret = fh_vmpic_get_msir(virq_to_hw(irq), &msir_value);
297 pr_err("fsl-msi: fh_vmpic_get_msir() failed for "
298 "irq %u (ret=%u)\n", irq, ret);
308 intr_index = ffs(msir_value) - 1;
310 err = generic_handle_domain_irq(msi_data->irqhost,
311 msi_hwirq(msi_data, msir_index,
312 intr_index + have_shift));
316 have_shift += intr_index + 1;
317 msir_value = msir_value >> (intr_index + 1);
323 static int fsl_of_msi_remove(struct platform_device *ofdev)
325 struct fsl_msi *msi = platform_get_drvdata(ofdev);
328 if (msi->list.prev != NULL)
329 list_del(&msi->list);
330 for (i = 0; i < NR_MSI_REG_MAX; i++) {
331 if (msi->cascade_array[i]) {
332 virq = msi->cascade_array[i]->virq;
336 free_irq(virq, msi->cascade_array[i]);
337 kfree(msi->cascade_array[i]);
338 irq_dispose_mapping(virq);
341 if (msi->bitmap.bitmap)
342 msi_bitmap_free(&msi->bitmap);
343 if ((msi->feature & FSL_PIC_IP_MASK) != FSL_PIC_IP_VMPIC)
344 iounmap(msi->msi_regs);
350 static struct lock_class_key fsl_msi_irq_class;
351 static struct lock_class_key fsl_msi_irq_request_class;
353 static int fsl_msi_setup_hwirq(struct fsl_msi *msi, struct platform_device *dev,
354 int offset, int irq_index)
356 struct fsl_msi_cascade_data *cascade_data = NULL;
357 int virt_msir, i, ret;
359 virt_msir = irq_of_parse_and_map(dev->dev.of_node, irq_index);
361 dev_err(&dev->dev, "%s: Cannot translate IRQ index %d\n",
362 __func__, irq_index);
366 cascade_data = kzalloc(sizeof(struct fsl_msi_cascade_data), GFP_KERNEL);
368 dev_err(&dev->dev, "No memory for MSI cascade data\n");
371 irq_set_lockdep_class(virt_msir, &fsl_msi_irq_class,
372 &fsl_msi_irq_request_class);
373 cascade_data->index = offset;
374 cascade_data->msi_data = msi;
375 cascade_data->virq = virt_msir;
376 msi->cascade_array[irq_index] = cascade_data;
378 ret = request_irq(virt_msir, fsl_msi_cascade, IRQF_NO_THREAD,
379 "fsl-msi-cascade", cascade_data);
381 dev_err(&dev->dev, "failed to request_irq(%d), ret = %d\n",
386 /* Release the hwirqs corresponding to this MSI register */
387 for (i = 0; i < IRQS_PER_MSI_REG; i++)
388 msi_bitmap_free_hwirqs(&msi->bitmap,
389 msi_hwirq(msi, offset, i), 1);
394 static const struct of_device_id fsl_of_msi_ids[];
395 static int fsl_of_msi_probe(struct platform_device *dev)
398 struct resource res, msiir;
399 int err, i, j, irq_index, count;
401 const struct fsl_msi_feature *features;
404 struct pci_controller *phb;
406 features = device_get_match_data(&dev->dev);
408 printk(KERN_DEBUG "Setting up Freescale MSI support\n");
410 msi = kzalloc(sizeof(struct fsl_msi), GFP_KERNEL);
412 dev_err(&dev->dev, "No memory for MSI structure\n");
415 platform_set_drvdata(dev, msi);
417 msi->irqhost = irq_domain_add_linear(dev->dev.of_node,
418 NR_MSI_IRQS_MAX, &fsl_msi_host_ops, msi);
420 if (msi->irqhost == NULL) {
421 dev_err(&dev->dev, "No memory for MSI irqhost\n");
427 * Under the Freescale hypervisor, the msi nodes don't have a 'reg'
428 * property. Instead, we use hypercalls to access the MSI.
430 if ((features->fsl_pic_ip & FSL_PIC_IP_MASK) != FSL_PIC_IP_VMPIC) {
431 err = of_address_to_resource(dev->dev.of_node, 0, &res);
433 dev_err(&dev->dev, "invalid resource for node %pOF\n",
438 msi->msi_regs = ioremap(res.start, resource_size(&res));
439 if (!msi->msi_regs) {
441 dev_err(&dev->dev, "could not map node %pOF\n",
446 features->msiir_offset + (res.start & 0xfffff);
449 * First read the MSIIR/MSIIR1 offset from dts
450 * On failure use the hardcode MSIIR offset
452 if (of_address_to_resource(dev->dev.of_node, 1, &msiir))
453 msi->msiir_offset = features->msiir_offset +
454 (res.start & MSIIR_OFFSET_MASK);
456 msi->msiir_offset = msiir.start & MSIIR_OFFSET_MASK;
459 msi->feature = features->fsl_pic_ip;
461 /* For erratum PIC1 on MPIC version 2.0*/
462 if ((features->fsl_pic_ip & FSL_PIC_IP_MASK) == FSL_PIC_IP_MPIC
463 && (fsl_mpic_primary_get_version() == 0x0200))
464 msi->feature |= MSI_HW_ERRATA_ENDIAN;
467 * Remember the phandle, so that we can match with any PCI nodes
468 * that have an "fsl,msi" property.
470 msi->phandle = dev->dev.of_node->phandle;
472 err = fsl_msi_init_allocator(msi);
474 dev_err(&dev->dev, "Error allocating MSI bitmap\n");
478 p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len);
480 if (of_device_is_compatible(dev->dev.of_node, "fsl,mpic-msi-v4.3") ||
481 of_device_is_compatible(dev->dev.of_node, "fsl,vmpic-msi-v4.3")) {
482 msi->srs_shift = MSIIR1_SRS_SHIFT;
483 msi->ibs_shift = MSIIR1_IBS_SHIFT;
485 dev_warn(&dev->dev, "%s: dose not support msi-available-ranges property\n",
488 for (irq_index = 0; irq_index < NR_MSI_REG_MSIIR1;
490 err = fsl_msi_setup_hwirq(msi, dev,
491 irq_index, irq_index);
496 static const u32 all_avail[] =
497 { 0, NR_MSI_REG_MSIIR * IRQS_PER_MSI_REG };
499 msi->srs_shift = MSIIR_SRS_SHIFT;
500 msi->ibs_shift = MSIIR_IBS_SHIFT;
502 if (p && len % (2 * sizeof(u32)) != 0) {
503 dev_err(&dev->dev, "%s: Malformed msi-available-ranges property\n",
511 len = sizeof(all_avail);
514 for (irq_index = 0, i = 0; i < len / (2 * sizeof(u32)); i++) {
515 if (p[i * 2] % IRQS_PER_MSI_REG ||
516 p[i * 2 + 1] % IRQS_PER_MSI_REG) {
517 pr_warn("%s: %pOF: msi available range of %u at %u is not IRQ-aligned\n",
518 __func__, dev->dev.of_node,
519 p[i * 2 + 1], p[i * 2]);
524 offset = p[i * 2] / IRQS_PER_MSI_REG;
525 count = p[i * 2 + 1] / IRQS_PER_MSI_REG;
527 for (j = 0; j < count; j++, irq_index++) {
528 err = fsl_msi_setup_hwirq(msi, dev, offset + j,
536 list_add_tail(&msi->list, &msi_head);
539 * Apply the MSI ops to all the controllers.
540 * It doesn't hurt to reassign the same ops,
541 * but bail out if we find another MSI driver.
543 list_for_each_entry(phb, &hose_list, list_node) {
544 if (!phb->controller_ops.setup_msi_irqs) {
545 phb->controller_ops.setup_msi_irqs = fsl_setup_msi_irqs;
546 phb->controller_ops.teardown_msi_irqs = fsl_teardown_msi_irqs;
547 } else if (phb->controller_ops.setup_msi_irqs != fsl_setup_msi_irqs) {
548 dev_err(&dev->dev, "Different MSI driver already installed!\n");
555 fsl_of_msi_remove(dev);
559 static const struct fsl_msi_feature mpic_msi_feature = {
560 .fsl_pic_ip = FSL_PIC_IP_MPIC,
561 .msiir_offset = 0x140,
564 static const struct fsl_msi_feature ipic_msi_feature = {
565 .fsl_pic_ip = FSL_PIC_IP_IPIC,
566 .msiir_offset = 0x38,
569 static const struct fsl_msi_feature vmpic_msi_feature = {
570 .fsl_pic_ip = FSL_PIC_IP_VMPIC,
574 static const struct of_device_id fsl_of_msi_ids[] = {
576 .compatible = "fsl,mpic-msi",
577 .data = &mpic_msi_feature,
580 .compatible = "fsl,mpic-msi-v4.3",
581 .data = &mpic_msi_feature,
584 .compatible = "fsl,ipic-msi",
585 .data = &ipic_msi_feature,
587 #ifdef CONFIG_EPAPR_PARAVIRT
589 .compatible = "fsl,vmpic-msi",
590 .data = &vmpic_msi_feature,
593 .compatible = "fsl,vmpic-msi-v4.3",
594 .data = &vmpic_msi_feature,
600 static struct platform_driver fsl_of_msi_driver = {
603 .of_match_table = fsl_of_msi_ids,
605 .probe = fsl_of_msi_probe,
606 .remove = fsl_of_msi_remove,
609 static __init int fsl_of_msi_init(void)
611 return platform_driver_register(&fsl_of_msi_driver);
614 subsys_initcall(fsl_of_msi_init);