2 * Freescale Management Complex (MC) bus driver MSI support
4 * Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
5 * Author: German Rivera <German.Rivera@freescale.com>
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
12 #include <linux/of_device.h>
13 #include <linux/of_address.h>
14 #include <linux/of_irq.h>
15 #include <linux/irq.h>
16 #include <linux/irqdomain.h>
17 #include <linux/msi.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->fsl_mc.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)
64 struct fsl_mc_device *owner_mc_dev = mc_dev_irq->mc_dev;
65 struct msi_desc *msi_desc = mc_dev_irq->msi_desc;
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)
76 if (WARN_ON(!owner_mc_dev))
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->fsl_mc.msi_index];
127 WARN_ON(mc_dev_irq->msi_desc != msi_desc);
128 msi_desc->msg = *msg;
131 * Program the MSI (paddr, value) pair in the device:
133 __fsl_mc_msi_write_msg(mc_bus_dev, mc_dev_irq);
136 static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)
138 struct irq_chip *chip = info->chip;
140 if (WARN_ON((!chip)))
144 * irq_write_msi_msg should not be set by the caller
146 if (!chip->irq_write_msi_msg)
147 chip->irq_write_msi_msg = fsl_mc_msi_write_msg;
151 * fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain
152 * @np: Optional device-tree node of the interrupt controller
153 * @info: MSI domain info
154 * @parent: Parent irq domain
156 * Updates the domain and chip ops and creates a fsl-mc MSI
160 * A domain pointer or NULL in case of failure.
162 struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
163 struct msi_domain_info *info,
164 struct irq_domain *parent)
166 struct irq_domain *domain;
168 if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
169 fsl_mc_msi_update_dom_ops(info);
170 if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
171 fsl_mc_msi_update_chip_ops(info);
173 domain = msi_create_irq_domain(fwnode, info, parent);
175 irq_domain_update_bus_token(domain, DOMAIN_BUS_FSL_MC_MSI);
180 int fsl_mc_find_msi_domain(struct device *mc_platform_dev,
181 struct irq_domain **mc_msi_domain)
183 struct irq_domain *msi_domain;
184 struct device_node *mc_of_node = mc_platform_dev->of_node;
186 msi_domain = of_msi_get_domain(mc_platform_dev, mc_of_node,
187 DOMAIN_BUS_FSL_MC_MSI);
189 pr_err("Unable to find fsl-mc MSI domain for %pOF\n",
195 *mc_msi_domain = msi_domain;
199 static void fsl_mc_msi_free_descs(struct device *dev)
201 struct msi_desc *desc, *tmp;
203 list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
204 list_del(&desc->list);
205 free_msi_entry(desc);
209 static int fsl_mc_msi_alloc_descs(struct device *dev, unsigned int irq_count)
214 struct msi_desc *msi_desc;
216 for (i = 0; i < irq_count; i++) {
217 msi_desc = alloc_msi_entry(dev, 1, NULL);
219 dev_err(dev, "Failed to allocate msi entry\n");
221 goto cleanup_msi_descs;
224 msi_desc->fsl_mc.msi_index = i;
225 INIT_LIST_HEAD(&msi_desc->list);
226 list_add_tail(&msi_desc->list, dev_to_msi_list(dev));
232 fsl_mc_msi_free_descs(dev);
236 int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
237 unsigned int irq_count)
239 struct irq_domain *msi_domain;
242 if (WARN_ON(!list_empty(dev_to_msi_list(dev))))
245 error = fsl_mc_msi_alloc_descs(dev, irq_count);
249 msi_domain = dev_get_msi_domain(dev);
250 if (WARN_ON(!msi_domain)) {
252 goto cleanup_msi_descs;
256 * NOTE: Calling this function will trigger the invocation of the
257 * its_fsl_mc_msi_prepare() callback
259 error = msi_domain_alloc_irqs(msi_domain, dev, irq_count);
262 dev_err(dev, "Failed to allocate IRQs\n");
263 goto cleanup_msi_descs;
269 fsl_mc_msi_free_descs(dev);
273 void fsl_mc_msi_domain_free_irqs(struct device *dev)
275 struct irq_domain *msi_domain;
277 msi_domain = dev_get_msi_domain(dev);
278 if (WARN_ON(!msi_domain))
281 msi_domain_free_irqs(msi_domain, dev);
283 if (WARN_ON(list_empty(dev_to_msi_list(dev))))
286 fsl_mc_msi_free_descs(dev);