1 // SPDX-License-Identifier: GPL-2.0
4  *  Loongson PCH MSI support
7 #define pr_fmt(fmt) "pch-msi: " fmt
10 #include <linux/msi.h>
39 	.name			= "PCH PCI MSI",
50 	mutex_lock(&priv->msi_map_lock);  in pch_msi_allocate_hwirq()
52 	first = bitmap_find_free_region(priv->msi_map, priv->num_irqs,  in pch_msi_allocate_hwirq()
55 		mutex_unlock(&priv->msi_map_lock);  in pch_msi_allocate_hwirq()
56 		return -ENOSPC;  in pch_msi_allocate_hwirq()
59 	mutex_unlock(&priv->msi_map_lock);  in pch_msi_allocate_hwirq()
61 	return priv->irq_first + first;  in pch_msi_allocate_hwirq()
67 	int first = hwirq - priv->irq_first;  in pch_msi_free_hwirq()
69 	mutex_lock(&priv->msi_map_lock);  in pch_msi_free_hwirq()
70 	bitmap_release_region(priv->msi_map, first, get_count_order(num_req));  in pch_msi_free_hwirq()
71 	mutex_unlock(&priv->msi_map_lock);  in pch_msi_free_hwirq()
79 	msg->address_hi = upper_32_bits(priv->doorbell);  in pch_msi_compose_msi_msg()
80 	msg->address_lo = lower_32_bits(priv->doorbell);  in pch_msi_compose_msi_msg()
81 	msg->data = data->hwirq;  in pch_msi_compose_msi_msg()
91 	.name			= "PCH MSI",
104 	fwspec.fwnode = domain->parent->fwnode;  in pch_msi_parent_domain_alloc()
115 	struct pch_msi_data *priv = domain->host_data;  in pch_msi_middle_domain_alloc()
135 	irq_domain_free_irqs_parent(domain, virq, i - 1);  in pch_msi_middle_domain_alloc()
148 	pch_msi_free_hwirq(priv, d->hwirq, nr_irqs);  in pch_msi_middle_domain_free()
163 						priv->num_irqs,  in pch_msi_init_domains()
167 		pr_err("Failed to create the MSI middle domain\n");  in pch_msi_init_domains()
168 		return -ENOMEM;  in pch_msi_init_domains()
171 	middle_domain->parent = parent;  in pch_msi_init_domains()
178 		pr_err("Failed to create PCI MSI domain\n");  in pch_msi_init_domains()
180 		return -ENOMEM;  in pch_msi_init_domains()
197 		return -ENXIO;  in pch_msi_init()
202 		return -ENOMEM;  in pch_msi_init()
204 	mutex_init(&priv->msi_map_lock);  in pch_msi_init()
212 	priv->doorbell = res.start;  in pch_msi_init()
214 	if (of_property_read_u32(node, "loongson,msi-base-vec",  in pch_msi_init()
215 				&priv->irq_first)) {  in pch_msi_init()
216 		pr_err("Unable to parse MSI vec base\n");  in pch_msi_init()
217 		ret = -EINVAL;  in pch_msi_init()
221 	if (of_property_read_u32(node, "loongson,msi-num-vecs",  in pch_msi_init()
222 				&priv->num_irqs)) {  in pch_msi_init()
223 		pr_err("Unable to parse MSI vec number\n");  in pch_msi_init()
224 		ret = -EINVAL;  in pch_msi_init()
228 	priv->msi_map = bitmap_alloc(priv->num_irqs, GFP_KERNEL);  in pch_msi_init()
229 	if (!priv->msi_map) {  in pch_msi_init()
230 		ret = -ENOMEM;  in pch_msi_init()
235 		 priv->num_irqs, priv->irq_first);  in pch_msi_init()
244 	kfree(priv->msi_map);  in pch_msi_init()
250 IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_init);