1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2007-2011 Freescale Semiconductor, Inc.
11 #include <linux/msi.h>
22 #include <asm/ppc-pci.h>
37 #define msi_hwirq(msi, msir_index, intr_index) \  argument
38 		((msir_index) << (msi)->srs_shift | \
39 		 ((intr_index) << (msi)->ibs_shift))
61  * in the cascade interrupt. So, this MSI interrupt has been acked
69 	struct fsl_msi *msi_data = irqd->domain->host_data;  in fsl_msi_print_chip()
73 	srs = (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK;  in fsl_msi_print_chip()
74 	cascade_virq = msi_data->cascade_array[srs]->virq;  in fsl_msi_print_chip()
76 	seq_printf(p, " fsl-msi-%d", cascade_virq);  in fsl_msi_print_chip()
90 	struct fsl_msi *msi_data = h->host_data;  in fsl_msi_host_map()
102 	.map = fsl_msi_host_map,
109 	rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS_MAX,  in fsl_msi_init_allocator()
110 			      irq_domain_get_of_node(msi_data->irqhost));  in fsl_msi_init_allocator()
119 		msi_bitmap_reserve_hwirq(&msi_data->bitmap, hwirq);  in fsl_msi_init_allocator()
130 	msi_for_each_desc(entry, &pdev->dev, MSI_DESC_ASSOCIATED) {  in fsl_teardown_msi_irqs()
131 		hwirq = virq_to_hw(entry->irq);  in fsl_teardown_msi_irqs()
132 		msi_data = irq_get_chip_data(entry->irq);  in fsl_teardown_msi_irqs()
133 		irq_set_msi_desc(entry->irq, NULL);  in fsl_teardown_msi_irqs()
134 		irq_dispose_mapping(entry->irq);  in fsl_teardown_msi_irqs()
135 		msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);  in fsl_teardown_msi_irqs()
144 	struct pci_controller *hose = pci_bus_to_host(pdev->bus);  in fsl_compose_msi_msg()
149 	/* If the msi-address-64 property exists, then use it */  in fsl_compose_msi_msg()
150 	reg = of_get_property(hose->dn, "msi-address-64", &len);  in fsl_compose_msi_msg()
154 		address = fsl_pci_immrbar_base(hose) + msi_data->msiir_offset;  in fsl_compose_msi_msg()
156 	msg->address_lo = lower_32_bits(address);  in fsl_compose_msi_msg()
157 	msg->address_hi = upper_32_bits(address);  in fsl_compose_msi_msg()
161 	 * that neither MSI nor MSI-X can work fine.  in fsl_compose_msi_msg()
162 	 * This is a workaround to allow MSI-X to function  in fsl_compose_msi_msg()
163 	 * properly. It only works for MSI-X, we prevent  in fsl_compose_msi_msg()
164 	 * MSI on buggy chips in fsl_setup_msi_irqs().  in fsl_compose_msi_msg()
166 	if (msi_data->feature & MSI_HW_ERRATA_ENDIAN)  in fsl_compose_msi_msg()
167 		msg->data = __swab32(hwirq);  in fsl_compose_msi_msg()
169 		msg->data = hwirq;  in fsl_compose_msi_msg()
172 		 (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK,  in fsl_compose_msi_msg()
173 		 (hwirq >> msi_data->ibs_shift) & MSI_IBS_MASK);  in fsl_compose_msi_msg()
178 	struct pci_controller *hose = pci_bus_to_host(pdev->bus);  in fsl_setup_msi_irqs()
181 	int rc, hwirq = -ENOMEM;  in fsl_setup_msi_irqs()
189 		 * MPIC version 2.0 has erratum PIC1. For now MSI  in fsl_setup_msi_irqs()
190 		 * could not work. So check to prevent MSI from  in fsl_setup_msi_irqs()
194 			if (msi_data->feature & MSI_HW_ERRATA_ENDIAN)  in fsl_setup_msi_irqs()
195 				return -EINVAL;  in fsl_setup_msi_irqs()
199 	 * If the PCI node has an fsl,msi property, then we need to use it  in fsl_setup_msi_irqs()
200 	 * to find the specific MSI.  in fsl_setup_msi_irqs()
202 	np = of_parse_phandle(hose->dn, "fsl,msi", 0);  in fsl_setup_msi_irqs()
204 		if (of_device_is_compatible(np, "fsl,mpic-msi") ||  in fsl_setup_msi_irqs()
205 		    of_device_is_compatible(np, "fsl,vmpic-msi") ||  in fsl_setup_msi_irqs()
206 		    of_device_is_compatible(np, "fsl,vmpic-msi-v4.3"))  in fsl_setup_msi_irqs()
207 			phandle = np->phandle;  in fsl_setup_msi_irqs()
209 			dev_err(&pdev->dev,  in fsl_setup_msi_irqs()
210 				"node %pOF has an invalid fsl,msi phandle %u\n",  in fsl_setup_msi_irqs()
211 				hose->dn, np->phandle);  in fsl_setup_msi_irqs()
213 			return -EINVAL;  in fsl_setup_msi_irqs()
218 	msi_for_each_desc(entry, &pdev->dev, MSI_DESC_NOTASSOCIATED) {  in fsl_setup_msi_irqs()
220 		 * Loop over all the MSI devices until we find one that has an  in fsl_setup_msi_irqs()
225 			 * If the PCI node has an fsl,msi property, then we  in fsl_setup_msi_irqs()
226 			 * restrict our search to the corresponding MSI node.  in fsl_setup_msi_irqs()
227 			 * The simplest way is to skip over MSI nodes with the  in fsl_setup_msi_irqs()
229 			 * has the additional benefit of skipping over MSI  in fsl_setup_msi_irqs()
232 			if (phandle && (phandle != msi_data->phandle))  in fsl_setup_msi_irqs()
235 			hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);  in fsl_setup_msi_irqs()
242 			dev_err(&pdev->dev, "could not allocate MSI interrupt\n");  in fsl_setup_msi_irqs()
246 		virq = irq_create_mapping(msi_data->irqhost, hwirq);  in fsl_setup_msi_irqs()
249 			dev_err(&pdev->dev, "fail mapping hwirq %i\n", hwirq);  in fsl_setup_msi_irqs()
250 			msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);  in fsl_setup_msi_irqs()
251 			rc = -ENOSPC;  in fsl_setup_msi_irqs()
254 		/* chip_data is msi_data via host->hostdata in host->map() */  in fsl_setup_msi_irqs()
270 	int msir_index = -1;  in fsl_msi_cascade()
277 	msi_data = cascade_data->msi_data;  in fsl_msi_cascade()
279 	msir_index = cascade_data->index;  in fsl_msi_cascade()
281 	switch (msi_data->feature & FSL_PIC_IP_MASK) {  in fsl_msi_cascade()
283 		msir_value = fsl_msi_read(msi_data->msi_regs,  in fsl_msi_cascade()
287 		msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4);  in fsl_msi_cascade()
294 			pr_err("fsl-msi: fh_vmpic_get_msir() failed for "  in fsl_msi_cascade()
305 		intr_index = ffs(msir_value) - 1;  in fsl_msi_cascade()
307 		err = generic_handle_domain_irq(msi_data->irqhost,  in fsl_msi_cascade()
322 	struct fsl_msi *msi = platform_get_drvdata(ofdev);  in fsl_of_msi_remove()  local
325 	if (msi->list.prev != NULL)  in fsl_of_msi_remove()
326 		list_del(&msi->list);  in fsl_of_msi_remove()
328 		if (msi->cascade_array[i]) {  in fsl_of_msi_remove()
329 			virq = msi->cascade_array[i]->virq;  in fsl_of_msi_remove()
333 			free_irq(virq, msi->cascade_array[i]);  in fsl_of_msi_remove()
334 			kfree(msi->cascade_array[i]);  in fsl_of_msi_remove()
338 	if (msi->bitmap.bitmap)  in fsl_of_msi_remove()
339 		msi_bitmap_free(&msi->bitmap);  in fsl_of_msi_remove()
340 	if ((msi->feature & FSL_PIC_IP_MASK) != FSL_PIC_IP_VMPIC)  in fsl_of_msi_remove()
341 		iounmap(msi->msi_regs);  in fsl_of_msi_remove()
342 	kfree(msi);  in fsl_of_msi_remove()
350 static int fsl_msi_setup_hwirq(struct fsl_msi *msi, struct platform_device *dev,  in fsl_msi_setup_hwirq()  argument
356 	virt_msir = irq_of_parse_and_map(dev->dev.of_node, irq_index);  in fsl_msi_setup_hwirq()
358 		dev_err(&dev->dev, "%s: Cannot translate IRQ index %d\n",  in fsl_msi_setup_hwirq()
365 		dev_err(&dev->dev, "No memory for MSI cascade data\n");  in fsl_msi_setup_hwirq()
366 		return -ENOMEM;  in fsl_msi_setup_hwirq()
370 	cascade_data->index = offset;  in fsl_msi_setup_hwirq()
371 	cascade_data->msi_data = msi;  in fsl_msi_setup_hwirq()
372 	cascade_data->virq = virt_msir;  in fsl_msi_setup_hwirq()
373 	msi->cascade_array[irq_index] = cascade_data;  in fsl_msi_setup_hwirq()
376 			  "fsl-msi-cascade", cascade_data);  in fsl_msi_setup_hwirq()
378 		dev_err(&dev->dev, "failed to request_irq(%d), ret = %d\n",  in fsl_msi_setup_hwirq()
383 	/* Release the hwirqs corresponding to this MSI register */  in fsl_msi_setup_hwirq()
385 		msi_bitmap_free_hwirqs(&msi->bitmap,  in fsl_msi_setup_hwirq()
386 				       msi_hwirq(msi, offset, i), 1);  in fsl_msi_setup_hwirq()
395 	struct fsl_msi *msi;  in fsl_of_msi_probe()  local
404 	match = of_match_device(fsl_of_msi_ids, &dev->dev);  in fsl_of_msi_probe()
406 		return -EINVAL;  in fsl_of_msi_probe()
407 	features = match->data;  in fsl_of_msi_probe()
409 	printk(KERN_DEBUG "Setting up Freescale MSI support\n");  in fsl_of_msi_probe()
411 	msi = kzalloc(sizeof(struct fsl_msi), GFP_KERNEL);  in fsl_of_msi_probe()
412 	if (!msi) {  in fsl_of_msi_probe()
413 		dev_err(&dev->dev, "No memory for MSI structure\n");  in fsl_of_msi_probe()
414 		return -ENOMEM;  in fsl_of_msi_probe()
416 	platform_set_drvdata(dev, msi);  in fsl_of_msi_probe()
418 	msi->irqhost = irq_domain_add_linear(dev->dev.of_node,  in fsl_of_msi_probe()
419 				      NR_MSI_IRQS_MAX, &fsl_msi_host_ops, msi);  in fsl_of_msi_probe()
421 	if (msi->irqhost == NULL) {  in fsl_of_msi_probe()
422 		dev_err(&dev->dev, "No memory for MSI irqhost\n");  in fsl_of_msi_probe()
423 		err = -ENOMEM;  in fsl_of_msi_probe()
428 	 * Under the Freescale hypervisor, the msi nodes don't have a 'reg'  in fsl_of_msi_probe()
429 	 * property.  Instead, we use hypercalls to access the MSI.  in fsl_of_msi_probe()
431 	if ((features->fsl_pic_ip & FSL_PIC_IP_MASK) != FSL_PIC_IP_VMPIC) {  in fsl_of_msi_probe()
432 		err = of_address_to_resource(dev->dev.of_node, 0, &res);  in fsl_of_msi_probe()
434 			dev_err(&dev->dev, "invalid resource for node %pOF\n",  in fsl_of_msi_probe()
435 				dev->dev.of_node);  in fsl_of_msi_probe()
439 		msi->msi_regs = ioremap(res.start, resource_size(&res));  in fsl_of_msi_probe()
440 		if (!msi->msi_regs) {  in fsl_of_msi_probe()
441 			err = -ENOMEM;  in fsl_of_msi_probe()
442 			dev_err(&dev->dev, "could not map node %pOF\n",  in fsl_of_msi_probe()
443 				dev->dev.of_node);  in fsl_of_msi_probe()
446 		msi->msiir_offset =  in fsl_of_msi_probe()
447 			features->msiir_offset + (res.start & 0xfffff);  in fsl_of_msi_probe()
453 		if (of_address_to_resource(dev->dev.of_node, 1, &msiir))  in fsl_of_msi_probe()
454 			msi->msiir_offset = features->msiir_offset +  in fsl_of_msi_probe()
457 			msi->msiir_offset = msiir.start & MSIIR_OFFSET_MASK;  in fsl_of_msi_probe()
460 	msi->feature = features->fsl_pic_ip;  in fsl_of_msi_probe()
463 	if ((features->fsl_pic_ip & FSL_PIC_IP_MASK) == FSL_PIC_IP_MPIC  in fsl_of_msi_probe()
465 		msi->feature |= MSI_HW_ERRATA_ENDIAN;  in fsl_of_msi_probe()
469 	 * that have an "fsl,msi" property.  in fsl_of_msi_probe()
471 	msi->phandle = dev->dev.of_node->phandle;  in fsl_of_msi_probe()
473 	err = fsl_msi_init_allocator(msi);  in fsl_of_msi_probe()
475 		dev_err(&dev->dev, "Error allocating MSI bitmap\n");  in fsl_of_msi_probe()
479 	p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len);  in fsl_of_msi_probe()
481 	if (of_device_is_compatible(dev->dev.of_node, "fsl,mpic-msi-v4.3") ||  in fsl_of_msi_probe()
482 	    of_device_is_compatible(dev->dev.of_node, "fsl,vmpic-msi-v4.3")) {  in fsl_of_msi_probe()
483 		msi->srs_shift = MSIIR1_SRS_SHIFT;  in fsl_of_msi_probe()
484 		msi->ibs_shift = MSIIR1_IBS_SHIFT;  in fsl_of_msi_probe()
486 			dev_warn(&dev->dev, "%s: dose not support msi-available-ranges property\n",  in fsl_of_msi_probe()
491 			err = fsl_msi_setup_hwirq(msi, dev,  in fsl_of_msi_probe()
500 		msi->srs_shift = MSIIR_SRS_SHIFT;  in fsl_of_msi_probe()
501 		msi->ibs_shift = MSIIR_IBS_SHIFT;  in fsl_of_msi_probe()
504 			dev_err(&dev->dev, "%s: Malformed msi-available-ranges property\n",  in fsl_of_msi_probe()
506 			err = -EINVAL;  in fsl_of_msi_probe()
518 				pr_warn("%s: %pOF: msi available range of %u at %u is not IRQ-aligned\n",  in fsl_of_msi_probe()
519 				       __func__, dev->dev.of_node,  in fsl_of_msi_probe()
521 				err = -EINVAL;  in fsl_of_msi_probe()
529 				err = fsl_msi_setup_hwirq(msi, dev, offset + j,  in fsl_of_msi_probe()
537 	list_add_tail(&msi->list, &msi_head);  in fsl_of_msi_probe()
540 	 * Apply the MSI ops to all the controllers.  in fsl_of_msi_probe()
542 	 * but bail out if we find another MSI driver.  in fsl_of_msi_probe()
545 		if (!phb->controller_ops.setup_msi_irqs) {  in fsl_of_msi_probe()
546 			phb->controller_ops.setup_msi_irqs = fsl_setup_msi_irqs;  in fsl_of_msi_probe()
547 			phb->controller_ops.teardown_msi_irqs = fsl_teardown_msi_irqs;  in fsl_of_msi_probe()
548 		} else if (phb->controller_ops.setup_msi_irqs != fsl_setup_msi_irqs) {  in fsl_of_msi_probe()
549 			dev_err(&dev->dev, "Different MSI driver already installed!\n");  in fsl_of_msi_probe()
550 			err = -ENODEV;  in fsl_of_msi_probe()
577 		.compatible = "fsl,mpic-msi",
581 		.compatible = "fsl,mpic-msi-v4.3",
585 		.compatible = "fsl,ipic-msi",
590 		.compatible = "fsl,vmpic-msi",
594 		.compatible = "fsl,vmpic-msi-v4.3",
603 		.name = "fsl-msi",