1 // SPDX-License-Identifier: GPL-2.0
3 * Freescale Management Complex (MC) bus driver MSI support
5 * Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
6 * Author: German Rivera <German.Rivera@freescale.com>
10 #include <linux/of_device.h>
11 #include <linux/of_address.h>
12 #include <linux/of_irq.h>
13 #include <linux/irq.h>
14 #include <linux/irqdomain.h>
15 #include <linux/msi.h>
16 #include <linux/acpi_iort.h>
18 #include "fsl-mc-private.h"
20 #ifdef GENERIC_MSI_DOMAIN_OPS
22 * Generate a unique ID identifying the interrupt (only used within the MSI
23 * irqdomain. Combine the icid with the interrupt index.
25 static irq_hw_number_t fsl_mc_domain_calc_hwirq(struct fsl_mc_device *dev,
26 struct msi_desc *desc)
29 * Make the base hwirq value for ICID*10000 so it is readable
30 * as a decimal value in /proc/interrupts.
32 return (irq_hw_number_t)(desc->msi_index + (dev->icid * 10000));
35 static void fsl_mc_msi_set_desc(msi_alloc_info_t *arg,
36 struct msi_desc *desc)
39 arg->hwirq = fsl_mc_domain_calc_hwirq(to_fsl_mc_device(desc->dev),
43 #define fsl_mc_msi_set_desc NULL
46 static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info)
48 struct msi_domain_ops *ops = info->ops;
54 * set_desc should not be set by the caller
57 ops->set_desc = fsl_mc_msi_set_desc;
60 static void __fsl_mc_msi_write_msg(struct fsl_mc_device *mc_bus_dev,
61 struct fsl_mc_device_irq *mc_dev_irq,
62 struct msi_desc *msi_desc)
65 struct fsl_mc_device *owner_mc_dev = mc_dev_irq->mc_dev;
66 struct dprc_irq_cfg irq_cfg;
69 * msi_desc->msg.address is 0x0 when this function is invoked in
70 * the free_irq() code path. In this case, for the MC, we don't
71 * really need to "unprogram" the MSI, so we just return.
73 if (msi_desc->msg.address_lo == 0x0 && msi_desc->msg.address_hi == 0x0)
79 irq_cfg.paddr = ((u64)msi_desc->msg.address_hi << 32) |
80 msi_desc->msg.address_lo;
81 irq_cfg.val = msi_desc->msg.data;
82 irq_cfg.irq_num = msi_desc->irq;
84 if (owner_mc_dev == mc_bus_dev) {
86 * IRQ is for the mc_bus_dev's DPRC itself
88 error = dprc_set_irq(mc_bus_dev->mc_io,
89 MC_CMD_FLAG_INTR_DIS | MC_CMD_FLAG_PRI,
90 mc_bus_dev->mc_handle,
91 mc_dev_irq->dev_irq_index,
94 dev_err(&owner_mc_dev->dev,
95 "dprc_set_irq() failed: %d\n", error);
99 * IRQ is for for a child device of mc_bus_dev
101 error = dprc_set_obj_irq(mc_bus_dev->mc_io,
102 MC_CMD_FLAG_INTR_DIS | MC_CMD_FLAG_PRI,
103 mc_bus_dev->mc_handle,
104 owner_mc_dev->obj_desc.type,
105 owner_mc_dev->obj_desc.id,
106 mc_dev_irq->dev_irq_index,
109 dev_err(&owner_mc_dev->dev,
110 "dprc_obj_set_irq() failed: %d\n", error);
116 * NOTE: This function is invoked with interrupts disabled
118 static void fsl_mc_msi_write_msg(struct irq_data *irq_data,
121 struct msi_desc *msi_desc = irq_data_get_msi_desc(irq_data);
122 struct fsl_mc_device *mc_bus_dev = to_fsl_mc_device(msi_desc->dev);
123 struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
124 struct fsl_mc_device_irq *mc_dev_irq =
125 &mc_bus->irq_resources[msi_desc->msi_index];
127 msi_desc->msg = *msg;
130 * Program the MSI (paddr, value) pair in the device:
132 __fsl_mc_msi_write_msg(mc_bus_dev, mc_dev_irq, msi_desc);
135 static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)
137 struct irq_chip *chip = info->chip;
143 * irq_write_msi_msg should not be set by the caller
145 if (!chip->irq_write_msi_msg)
146 chip->irq_write_msi_msg = fsl_mc_msi_write_msg;
150 * fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain
151 * @fwnode: Optional firmware 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
159 * A domain pointer or NULL in case of failure.
161 struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
162 struct msi_domain_info *info,
163 struct irq_domain *parent)
165 struct irq_domain *domain;
167 if (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE)))
168 info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
169 if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
170 fsl_mc_msi_update_dom_ops(info);
171 if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
172 fsl_mc_msi_update_chip_ops(info);
173 info->flags |= MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;
175 domain = msi_create_irq_domain(fwnode, info, parent);
177 irq_domain_update_bus_token(domain, DOMAIN_BUS_FSL_MC_MSI);
182 struct irq_domain *fsl_mc_find_msi_domain(struct device *dev)
184 struct device *root_dprc_dev;
185 struct device *bus_dev;
186 struct irq_domain *msi_domain;
187 struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
189 fsl_mc_get_root_dprc(dev, &root_dprc_dev);
190 bus_dev = root_dprc_dev->parent;
192 if (bus_dev->of_node) {
193 msi_domain = of_msi_map_get_device_domain(dev,
195 DOMAIN_BUS_FSL_MC_MSI);
198 * if the msi-map property is missing assume that all the
199 * child containers inherit the domain from the parent
203 msi_domain = of_msi_get_domain(bus_dev,
205 DOMAIN_BUS_FSL_MC_MSI);
207 msi_domain = iort_get_device_domain(dev, mc_dev->icid,
208 DOMAIN_BUS_FSL_MC_MSI);
214 int fsl_mc_msi_domain_alloc_irqs(struct device *dev, unsigned int irq_count)
216 struct irq_domain *msi_domain;
219 msi_domain = dev_get_msi_domain(dev);
223 error = msi_setup_device_data(dev);
228 if (msi_first_desc(dev, MSI_DESC_ALL))
230 msi_unlock_descs(dev);
235 * NOTE: Calling this function will trigger the invocation of the
236 * its_fsl_mc_msi_prepare() callback
238 error = msi_domain_alloc_irqs(msi_domain, dev, irq_count);
241 dev_err(dev, "Failed to allocate IRQs\n");
245 void fsl_mc_msi_domain_free_irqs(struct device *dev)
247 struct irq_domain *msi_domain;
249 msi_domain = dev_get_msi_domain(dev);
253 msi_domain_free_irqs(msi_domain, dev);