234 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Freescale Management Complex (MC) bus driver MSI support4 *5 * Copyright (C) 2015-2016 Freescale Semiconductor, Inc.6 * Author: German Rivera <German.Rivera@freescale.com>7 *8 */9 10#include <linux/of_irq.h>11#include <linux/irq.h>12#include <linux/irqdomain.h>13#include <linux/msi.h>14#include <linux/acpi_iort.h>15 16#include "fsl-mc-private.h"17 18#ifdef GENERIC_MSI_DOMAIN_OPS19/*20 * Generate a unique ID identifying the interrupt (only used within the MSI21 * irqdomain. Combine the icid with the interrupt index.22 */23static irq_hw_number_t fsl_mc_domain_calc_hwirq(struct fsl_mc_device *dev,24 struct msi_desc *desc)25{26 /*27 * Make the base hwirq value for ICID*10000 so it is readable28 * as a decimal value in /proc/interrupts.29 */30 return (irq_hw_number_t)(desc->msi_index + (dev->icid * 10000));31}32 33static void fsl_mc_msi_set_desc(msi_alloc_info_t *arg,34 struct msi_desc *desc)35{36 arg->desc = desc;37 arg->hwirq = fsl_mc_domain_calc_hwirq(to_fsl_mc_device(desc->dev),38 desc);39}40#else41#define fsl_mc_msi_set_desc NULL42#endif43 44static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info)45{46 struct msi_domain_ops *ops = info->ops;47 48 if (!ops)49 return;50 51 /*52 * set_desc should not be set by the caller53 */54 if (!ops->set_desc)55 ops->set_desc = fsl_mc_msi_set_desc;56}57 58static void __fsl_mc_msi_write_msg(struct fsl_mc_device *mc_bus_dev,59 struct fsl_mc_device_irq *mc_dev_irq,60 struct msi_desc *msi_desc)61{62 int error;63 struct fsl_mc_device *owner_mc_dev = mc_dev_irq->mc_dev;64 struct dprc_irq_cfg irq_cfg;65 66 /*67 * msi_desc->msg.address is 0x0 when this function is invoked in68 * the free_irq() code path. In this case, for the MC, we don't69 * really need to "unprogram" the MSI, so we just return.70 */71 if (msi_desc->msg.address_lo == 0x0 && msi_desc->msg.address_hi == 0x0)72 return;73 74 if (!owner_mc_dev)75 return;76 77 irq_cfg.paddr = ((u64)msi_desc->msg.address_hi << 32) |78 msi_desc->msg.address_lo;79 irq_cfg.val = msi_desc->msg.data;80 irq_cfg.irq_num = msi_desc->irq;81 82 if (owner_mc_dev == mc_bus_dev) {83 /*84 * IRQ is for the mc_bus_dev's DPRC itself85 */86 error = dprc_set_irq(mc_bus_dev->mc_io,87 MC_CMD_FLAG_INTR_DIS | MC_CMD_FLAG_PRI,88 mc_bus_dev->mc_handle,89 mc_dev_irq->dev_irq_index,90 &irq_cfg);91 if (error < 0) {92 dev_err(&owner_mc_dev->dev,93 "dprc_set_irq() failed: %d\n", error);94 }95 } else {96 /*97 * IRQ is for for a child device of mc_bus_dev98 */99 error = dprc_set_obj_irq(mc_bus_dev->mc_io,100 MC_CMD_FLAG_INTR_DIS | MC_CMD_FLAG_PRI,101 mc_bus_dev->mc_handle,102 owner_mc_dev->obj_desc.type,103 owner_mc_dev->obj_desc.id,104 mc_dev_irq->dev_irq_index,105 &irq_cfg);106 if (error < 0) {107 dev_err(&owner_mc_dev->dev,108 "dprc_obj_set_irq() failed: %d\n", error);109 }110 }111}112 113/*114 * NOTE: This function is invoked with interrupts disabled115 */116static void fsl_mc_msi_write_msg(struct irq_data *irq_data,117 struct msi_msg *msg)118{119 struct msi_desc *msi_desc = irq_data_get_msi_desc(irq_data);120 struct fsl_mc_device *mc_bus_dev = to_fsl_mc_device(msi_desc->dev);121 struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);122 struct fsl_mc_device_irq *mc_dev_irq =123 &mc_bus->irq_resources[msi_desc->msi_index];124 125 msi_desc->msg = *msg;126 127 /*128 * Program the MSI (paddr, value) pair in the device:129 */130 __fsl_mc_msi_write_msg(mc_bus_dev, mc_dev_irq, msi_desc);131}132 133static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)134{135 struct irq_chip *chip = info->chip;136 137 if (!chip)138 return;139 140 /*141 * irq_write_msi_msg should not be set by the caller142 */143 if (!chip->irq_write_msi_msg)144 chip->irq_write_msi_msg = fsl_mc_msi_write_msg;145}146 147/**148 * fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain149 * @fwnode: Optional firmware node of the interrupt controller150 * @info: MSI domain info151 * @parent: Parent irq domain152 *153 * Updates the domain and chip ops and creates a fsl-mc MSI154 * interrupt domain.155 *156 * Returns:157 * A domain pointer or NULL in case of failure.158 */159struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,160 struct msi_domain_info *info,161 struct irq_domain *parent)162{163 struct irq_domain *domain;164 165 if (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE)))166 info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;167 if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)168 fsl_mc_msi_update_dom_ops(info);169 if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)170 fsl_mc_msi_update_chip_ops(info);171 info->flags |= MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;172 173 domain = msi_create_irq_domain(fwnode, info, parent);174 if (domain)175 irq_domain_update_bus_token(domain, DOMAIN_BUS_FSL_MC_MSI);176 177 return domain;178}179 180struct irq_domain *fsl_mc_find_msi_domain(struct device *dev)181{182 struct device *root_dprc_dev;183 struct device *bus_dev;184 struct irq_domain *msi_domain;185 struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);186 187 fsl_mc_get_root_dprc(dev, &root_dprc_dev);188 bus_dev = root_dprc_dev->parent;189 190 if (bus_dev->of_node) {191 msi_domain = of_msi_map_get_device_domain(dev,192 mc_dev->icid,193 DOMAIN_BUS_FSL_MC_MSI);194 195 /*196 * if the msi-map property is missing assume that all the197 * child containers inherit the domain from the parent198 */199 if (!msi_domain)200 201 msi_domain = of_msi_get_domain(bus_dev,202 bus_dev->of_node,203 DOMAIN_BUS_FSL_MC_MSI);204 } else {205 msi_domain = iort_get_device_domain(dev, mc_dev->icid,206 DOMAIN_BUS_FSL_MC_MSI);207 }208 209 return msi_domain;210}211 212int fsl_mc_msi_domain_alloc_irqs(struct device *dev, unsigned int irq_count)213{214 int error = msi_setup_device_data(dev);215 216 if (error)217 return error;218 219 /*220 * NOTE: Calling this function will trigger the invocation of the221 * its_fsl_mc_msi_prepare() callback222 */223 error = msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0, irq_count - 1);224 225 if (error)226 dev_err(dev, "Failed to allocate IRQs\n");227 return error;228}229 230void fsl_mc_msi_domain_free_irqs(struct device *dev)231{232 msi_domain_free_irqs_all(dev, MSI_DEFAULT_DOMAIN);233}234