1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * MSI support for PPC4xx SoCs using High Speed Transfer Assist (HSTA) for
11 #include <linux/msi.h>
18 #include <asm/ppc-pci.h>
23 	/* The ioremapped HSTA MSI IO space */
26 	/* Physical address of HSTA MSI IO space */
45 	/* We don't support MSI-X */  in hsta_setup_msi_irqs()
47 		pr_debug("%s: MSI-X not supported.\n", __func__);  in hsta_setup_msi_irqs()
48 		return -EINVAL;  in hsta_setup_msi_irqs()
51 	msi_for_each_desc(entry, &dev->dev, MSI_DESC_NOTASSOCIATED) {  in hsta_setup_msi_irqs()
54 			pr_debug("%s: Failed to allocate msi interrupt\n",  in hsta_setup_msi_irqs()
62 			return -EINVAL;  in hsta_setup_msi_irqs()
66 		 * HSTA generates interrupts on writes to 128-bit aligned  in hsta_setup_msi_irqs()
84 			return -EINVAL;  in hsta_setup_msi_irqs()
101 	return -EINVAL;  in hsta_find_hwirq_offset()
109 	msi_for_each_desc(entry, &dev->dev, MSI_DESC_ASSOCIATED) {  in hsta_teardown_msi_irqs()
110 		irq = hsta_find_hwirq_offset(entry->irq);  in hsta_teardown_msi_irqs()
112 		/* entry->irq should always be in irq_map */  in hsta_teardown_msi_irqs()
114 		irq_set_msi_desc(entry->irq, NULL);  in hsta_teardown_msi_irqs()
117 			 entry->irq, irq);  in hsta_teardown_msi_irqs()
123 	struct device *dev = &pdev->dev;  in hsta_msi_probe()
131 		return -EINVAL;  in hsta_msi_probe()
134 	irq_count = of_irq_count(dev->of_node);  in hsta_msi_probe()
137 		return -EINVAL;  in hsta_msi_probe()
141 	ppc4xx_hsta_msi.address = mem->start;  in hsta_msi_probe()
142 	ppc4xx_hsta_msi.data = ioremap(mem->start, resource_size(mem));  in hsta_msi_probe()
145 		dev_err(dev, "Unable to map memory\n");  in hsta_msi_probe()
146 		return -ENOMEM;  in hsta_msi_probe()
149 	ret = msi_bitmap_alloc(&ppc4xx_hsta_msi.bmp, irq_count, dev->of_node);  in hsta_msi_probe()
156 		ret = -ENOMEM;  in hsta_msi_probe()
163 			irq_of_parse_and_map(dev->of_node, irq);  in hsta_msi_probe()
165 			dev_err(dev, "Unable to map IRQ\n");  in hsta_msi_probe()
166 			ret = -EINVAL;  in hsta_msi_probe()
172 		phb->controller_ops.setup_msi_irqs = hsta_setup_msi_irqs;  in hsta_msi_probe()
173 		phb->controller_ops.teardown_msi_irqs = hsta_teardown_msi_irqs;  in hsta_msi_probe()
190 		.compatible = "ibm,hsta-msi",
198 		.name = "hsta-msi",