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>
43 	.name			= "PCH PCI MSI",
54 	mutex_lock(&priv->msi_map_lock);  in pch_msi_allocate_hwirq()
56 	first = bitmap_find_free_region(priv->msi_map, priv->num_irqs,  in pch_msi_allocate_hwirq()
59 		mutex_unlock(&priv->msi_map_lock);  in pch_msi_allocate_hwirq()
60 		return -ENOSPC;  in pch_msi_allocate_hwirq()
63 	mutex_unlock(&priv->msi_map_lock);  in pch_msi_allocate_hwirq()
65 	return priv->irq_first + first;  in pch_msi_allocate_hwirq()
71 	int first = hwirq - priv->irq_first;  in pch_msi_free_hwirq()
73 	mutex_lock(&priv->msi_map_lock);  in pch_msi_free_hwirq()
74 	bitmap_release_region(priv->msi_map, first, get_count_order(num_req));  in pch_msi_free_hwirq()
75 	mutex_unlock(&priv->msi_map_lock);  in pch_msi_free_hwirq()
83 	msg->address_hi = upper_32_bits(priv->doorbell);  in pch_msi_compose_msi_msg()
84 	msg->address_lo = lower_32_bits(priv->doorbell);  in pch_msi_compose_msi_msg()
85 	msg->data = data->hwirq;  in pch_msi_compose_msi_msg()
95 	.name			= "PCH MSI",
108 	fwspec.fwnode = domain->parent->fwnode;  in pch_msi_parent_domain_alloc()
119 	struct pch_msi_data *priv = domain->host_data;  in pch_msi_middle_domain_alloc()
152 	pch_msi_free_hwirq(priv, d->hwirq, nr_irqs);  in pch_msi_middle_domain_free()
161 				struct irq_domain *parent,  in pch_msi_init_domains()  argument
166 	middle_domain = irq_domain_create_hierarchy(parent, 0, priv->num_irqs,  in pch_msi_init_domains()
171 		pr_err("Failed to create the MSI middle domain\n");  in pch_msi_init_domains()
172 		return -ENOMEM;  in pch_msi_init_domains()
181 		pr_err("Failed to create PCI MSI domain\n");  in pch_msi_init_domains()
183 		return -ENOMEM;  in pch_msi_init_domains()
197 		return -ENOMEM;  in pch_msi_init()
199 	mutex_init(&priv->msi_map_lock);  in pch_msi_init()
201 	priv->doorbell = msg_address;  in pch_msi_init()
202 	priv->irq_first = irq_base;  in pch_msi_init()
203 	priv->num_irqs = irq_count;  in pch_msi_init()
205 	priv->msi_map = bitmap_zalloc(priv->num_irqs, GFP_KERNEL);  in pch_msi_init()
206 	if (!priv->msi_map)  in pch_msi_init()
210 		 priv->num_irqs, priv->irq_first);  in pch_msi_init()
220 	bitmap_free(priv->msi_map);  in pch_msi_init()
224 	return -EINVAL;  in pch_msi_init()
228 static int pch_msi_of_init(struct device_node *node, struct device_node *parent)  in pch_msi_of_init()  argument
235 	parent_domain = irq_find_host(parent);  in pch_msi_of_init()
237 		pr_err("Failed to find the parent domain\n");  in pch_msi_of_init()
238 		return -ENXIO;  in pch_msi_of_init()
243 		return -EINVAL;  in pch_msi_of_init()
246 	if (of_property_read_u32(node, "loongson,msi-base-vec", &irq_base)) {  in pch_msi_of_init()
247 		pr_err("Unable to parse MSI vec base\n");  in pch_msi_of_init()
248 		return -EINVAL;  in pch_msi_of_init()
251 	if (of_property_read_u32(node, "loongson,msi-num-vecs", &irq_count)) {  in pch_msi_of_init()
252 		pr_err("Unable to parse MSI vec number\n");  in pch_msi_of_init()
253 		return -EINVAL;  in pch_msi_of_init()
263 IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_of_init);
278 int __init pch_msi_acpi_init(struct irq_domain *parent,  in pch_msi_acpi_init()  argument
284 	domain_handle = irq_domain_alloc_fwnode(&acpi_pchmsi->msg_address);  in pch_msi_acpi_init()
285 	ret = pch_msi_init(acpi_pchmsi->msg_address, acpi_pchmsi->start,  in pch_msi_acpi_init()
286 				acpi_pchmsi->count, parent, domain_handle);  in pch_msi_acpi_init()