1 // SPDX-License-Identifier: GPL-2.0
3  * AMD CDX bus driver MSI support
5  * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
14 #include <linux/msi.h>
22 	struct cdx_device *cdx_dev = to_cdx_device(msi_desc->dev);  in cdx_msi_write_msg()
27 	msi_desc->msg = *msg;  in cdx_msi_write_msg()
28 	cdx_dev->msi_write_pending = true;  in cdx_msi_write_msg()
34 	struct cdx_device *cdx_dev = to_cdx_device(msi_desc->dev);  in cdx_msi_write_irq_lock()
36 	mutex_lock(&cdx_dev->irqchip_lock);  in cdx_msi_write_irq_lock()
42 	struct cdx_device *cdx_dev = to_cdx_device(msi_desc->dev);  in cdx_msi_write_irq_unlock()
43 	struct cdx_controller *cdx = cdx_dev->cdx;  in cdx_msi_write_irq_unlock()
46 	if (!cdx_dev->msi_write_pending) {  in cdx_msi_write_irq_unlock()
47 		mutex_unlock(&cdx_dev->irqchip_lock);  in cdx_msi_write_irq_unlock()
51 	cdx_dev->msi_write_pending = false;  in cdx_msi_write_irq_unlock()
52 	mutex_unlock(&cdx_dev->irqchip_lock);  in cdx_msi_write_irq_unlock()
54 	dev_config.msi.msi_index = msi_desc->msi_index;  in cdx_msi_write_irq_unlock()
55 	dev_config.msi.data = msi_desc->msg.data;  in cdx_msi_write_irq_unlock()
56 	dev_config.msi.addr = ((u64)(msi_desc->msg.address_hi) << 32) | msi_desc->msg.address_lo;  in cdx_msi_write_irq_unlock()
64 	if (cdx->ops->dev_configure)  in cdx_msi_write_irq_unlock()
65 		cdx->ops->dev_configure(cdx, cdx_dev->bus_num, cdx_dev->dev_num, &dev_config);  in cdx_msi_write_irq_unlock()
70 	struct cdx_controller *cdx = cdx_dev->cdx;  in cdx_enable_msi()
75 	if (cdx->ops->dev_configure) {  in cdx_enable_msi()
76 		return cdx->ops->dev_configure(cdx, cdx_dev->bus_num, cdx_dev->dev_num,  in cdx_enable_msi()
80 	return -EOPNOTSUPP;  in cdx_enable_msi()
86 	struct cdx_controller *cdx = cdx_dev->cdx;  in cdx_disable_msi()
91 	if (cdx->ops->dev_configure)  in cdx_disable_msi()
92 		cdx->ops->dev_configure(cdx, cdx_dev->bus_num, cdx_dev->dev_num, &dev_config);  in cdx_disable_msi()
97 	.name			= "CDX-MSI",
111 	return ((irq_hw_number_t)dev->msi_dev_id << 10) | desc->msi_index;  in cdx_domain_calc_hwirq()
116 	arg->desc = desc;  in cdx_msi_set_desc()
117 	arg->hwirq = cdx_domain_calc_hwirq(to_cdx_device(desc->dev), desc);  in cdx_msi_set_desc()
125 	struct device *parent = cdx_dev->cdx->dev;  in cdx_msi_prepare()  local
130 	/* Retrieve device ID from requestor ID using parent device */  in cdx_msi_prepare()
131 	ret = of_map_id(parent->of_node, cdx_dev->msi_dev_id, "msi-map", "msi-map-mask",  in cdx_msi_prepare()
134 		dev_err(dev, "of_map_id failed for MSI: %d\n", ret);  in cdx_msi_prepare()
139 	/* Set the device Id to be passed to the GIC-ITS */  in cdx_msi_prepare()
140 	info->scratchpad[0].ul = dev_id;  in cdx_msi_prepare()
143 	msi_info = msi_get_domain_info(msi_domain->parent);  in cdx_msi_prepare()
145 	return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);  in cdx_msi_prepare()
162 	struct device_node *np = dev->of_node;  in cdx_msi_domain_init()
166 	struct irq_domain *parent;  in cdx_msi_domain_init()  local
170 	parent_node = of_parse_phandle(np, "msi-map", 1);  in cdx_msi_domain_init()
172 		dev_err(dev, "msi-map not present on cdx controller\n");  in cdx_msi_domain_init()
176 	parent = irq_find_matching_fwnode(of_node_to_fwnode(parent_node), DOMAIN_BUS_NEXUS);  in cdx_msi_domain_init()
177 	if (!parent || !msi_get_domain_info(parent)) {  in cdx_msi_domain_init()
182 	cdx_msi_domain = msi_create_irq_domain(fwnode_handle, &cdx_msi_domain_info, parent);  in cdx_msi_domain_init()
184 		dev_err(dev, "unable to create CDX-MSI domain\n");  in cdx_msi_domain_init()
188 	dev_dbg(dev, "CDX-MSI domain created\n");  in cdx_msi_domain_init()