1 // SPDX-License-Identifier: GPL-2.0
3  * Freescale Management Complex (MC) bus driver MSI support
5  * Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
15 #include <linux/msi.h>
18 #include "fsl-mc-private.h"
22  * Generate a unique ID identifying the interrupt (only used within the MSI
32 	return (irq_hw_number_t)(desc->fsl_mc.msi_index + (dev->icid * 10000));  in fsl_mc_domain_calc_hwirq()
38 	arg->desc = desc;  in fsl_mc_msi_set_desc()
39 	arg->hwirq = fsl_mc_domain_calc_hwirq(to_fsl_mc_device(desc->dev),  in fsl_mc_msi_set_desc()
48 	struct msi_domain_ops *ops = info->ops;  in fsl_mc_msi_update_dom_ops()
56 	if (!ops->set_desc)  in fsl_mc_msi_update_dom_ops()
57 		ops->set_desc = fsl_mc_msi_set_desc;  in fsl_mc_msi_update_dom_ops()
64 	struct fsl_mc_device *owner_mc_dev = mc_dev_irq->mc_dev;  in __fsl_mc_msi_write_msg()
65 	struct msi_desc *msi_desc = mc_dev_irq->msi_desc;  in __fsl_mc_msi_write_msg()
69 	 * msi_desc->msg.address is 0x0 when this function is invoked in  in __fsl_mc_msi_write_msg()
71 	 * really need to "unprogram" the MSI, so we just return.  in __fsl_mc_msi_write_msg()
73 	if (msi_desc->msg.address_lo == 0x0 && msi_desc->msg.address_hi == 0x0)  in __fsl_mc_msi_write_msg()
79 	irq_cfg.paddr = ((u64)msi_desc->msg.address_hi << 32) |  in __fsl_mc_msi_write_msg()
80 			msi_desc->msg.address_lo;  in __fsl_mc_msi_write_msg()
81 	irq_cfg.val = msi_desc->msg.data;  in __fsl_mc_msi_write_msg()
82 	irq_cfg.irq_num = msi_desc->irq;  in __fsl_mc_msi_write_msg()
88 		error = dprc_set_irq(mc_bus_dev->mc_io,  in __fsl_mc_msi_write_msg()
90 				     mc_bus_dev->mc_handle,  in __fsl_mc_msi_write_msg()
91 				     mc_dev_irq->dev_irq_index,  in __fsl_mc_msi_write_msg()
94 			dev_err(&owner_mc_dev->dev,  in __fsl_mc_msi_write_msg()
101 		error = dprc_set_obj_irq(mc_bus_dev->mc_io,  in __fsl_mc_msi_write_msg()
103 					 mc_bus_dev->mc_handle,  in __fsl_mc_msi_write_msg()
104 					 owner_mc_dev->obj_desc.type,  in __fsl_mc_msi_write_msg()
105 					 owner_mc_dev->obj_desc.id,  in __fsl_mc_msi_write_msg()
106 					 mc_dev_irq->dev_irq_index,  in __fsl_mc_msi_write_msg()
109 			dev_err(&owner_mc_dev->dev,  in __fsl_mc_msi_write_msg()
122 	struct fsl_mc_device *mc_bus_dev = to_fsl_mc_device(msi_desc->dev);  in fsl_mc_msi_write_msg()
125 		&mc_bus->irq_resources[msi_desc->fsl_mc.msi_index];  in fsl_mc_msi_write_msg()
127 	msi_desc->msg = *msg;  in fsl_mc_msi_write_msg()
130 	 * Program the MSI (paddr, value) pair in the device:  in fsl_mc_msi_write_msg()
137 	struct irq_chip *chip = info->chip;  in fsl_mc_msi_update_chip_ops()
145 	if (!chip->irq_write_msi_msg)  in fsl_mc_msi_update_chip_ops()
146 		chip->irq_write_msi_msg = fsl_mc_msi_write_msg;  in fsl_mc_msi_update_chip_ops()
150  * fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain
151  * @np:		Optional device-tree node of the interrupt controller
152  * @info:	MSI domain info
153  * @parent:	Parent irq domain
155  * Updates the domain and chip ops and creates a fsl-mc MSI
163 						struct irq_domain *parent)  in fsl_mc_msi_create_irq_domain()  argument
167 	if (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE)))  in fsl_mc_msi_create_irq_domain()
168 		info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;  in fsl_mc_msi_create_irq_domain()
169 	if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)  in fsl_mc_msi_create_irq_domain()
171 	if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)  in fsl_mc_msi_create_irq_domain()
174 	domain = msi_create_irq_domain(fwnode, info, parent);  in fsl_mc_msi_create_irq_domain()
189 	bus_dev = root_dprc_dev->parent;  in fsl_mc_find_msi_domain()
191 	if (bus_dev->of_node) {  in fsl_mc_find_msi_domain()
193 						  mc_dev->icid,  in fsl_mc_find_msi_domain()
197 		 * if the msi-map property is missing assume that all the  in fsl_mc_find_msi_domain()
198 		 * child containers inherit the domain from the parent  in fsl_mc_find_msi_domain()
203 						bus_dev->of_node,  in fsl_mc_find_msi_domain()
206 		msi_domain = iort_get_device_domain(dev, mc_dev->icid,  in fsl_mc_find_msi_domain()
218 		list_del(&desc->list);  in fsl_mc_msi_free_descs()
233 			dev_err(dev, "Failed to allocate msi entry\n");  in fsl_mc_msi_alloc_descs()
234 			error = -ENOMEM;  in fsl_mc_msi_alloc_descs()
238 		msi_desc->fsl_mc.msi_index = i;  in fsl_mc_msi_alloc_descs()
239 		INIT_LIST_HEAD(&msi_desc->list);  in fsl_mc_msi_alloc_descs()
240 		list_add_tail(&msi_desc->list, dev_to_msi_list(dev));  in fsl_mc_msi_alloc_descs()
257 		return -EINVAL;  in fsl_mc_msi_domain_alloc_irqs()
265 		error = -EINVAL;  in fsl_mc_msi_domain_alloc_irqs()