+++ /dev/null
-/*
- * Freescale Management Complex (MC) bus driver MSI support
- *
- * Copyright (C) 2015 Freescale Semiconductor, Inc.
- * Author: German Rivera <German.Rivera@freescale.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- */
-
-#include "../include/mc-private.h"
-#include <linux/of_device.h>
-#include <linux/of_address.h>
-#include <linux/irqchip/arm-gic-v3.h>
-#include <linux/of_irq.h>
-#include <linux/irq.h>
-#include <linux/irqdomain.h>
-#include <linux/msi.h>
-#include "../include/mc-sys.h"
-#include "dprc-cmd.h"
-
-/*
- * Generate a unique ID identifying the interrupt (only used within the MSI
- * irqdomain. Combine the icid with the interrupt index.
- */
-static irq_hw_number_t fsl_mc_domain_calc_hwirq(struct fsl_mc_device *dev,
- struct msi_desc *desc)
-{
- /*
- * Make the base hwirq value for ICID*10000 so it is readable
- * as a decimal value in /proc/interrupts.
- */
- return (irq_hw_number_t)(desc->fsl_mc.msi_index + (dev->icid * 10000));
-}
-
-static void fsl_mc_msi_set_desc(msi_alloc_info_t *arg,
- struct msi_desc *desc)
-{
- arg->desc = desc;
- arg->hwirq = fsl_mc_domain_calc_hwirq(to_fsl_mc_device(desc->dev),
- desc);
-}
-
-static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info)
-{
- struct msi_domain_ops *ops = info->ops;
-
- if (WARN_ON(!ops))
- return;
-
- /*
- * set_desc should not be set by the caller
- */
- if (ops->set_desc == NULL)
- ops->set_desc = fsl_mc_msi_set_desc;
-}
-
-static void __fsl_mc_msi_write_msg(struct fsl_mc_device *mc_bus_dev,
- struct fsl_mc_device_irq *mc_dev_irq)
-{
- int error;
- struct fsl_mc_device *owner_mc_dev = mc_dev_irq->mc_dev;
- struct msi_desc *msi_desc = mc_dev_irq->msi_desc;
- struct dprc_irq_cfg irq_cfg;
-
- /*
- * msi_desc->msg.address is 0x0 when this function is invoked in
- * the free_irq() code path. In this case, for the MC, we don't
- * really need to "unprogram" the MSI, so we just return.
- */
- if (msi_desc->msg.address_lo == 0x0 && msi_desc->msg.address_hi == 0x0)
- return;
-
- if (WARN_ON(!owner_mc_dev))
- return;
-
- irq_cfg.paddr = ((u64)msi_desc->msg.address_hi << 32) |
- msi_desc->msg.address_lo;
- irq_cfg.val = msi_desc->msg.data;
- irq_cfg.irq_num = msi_desc->irq;
-
- if (owner_mc_dev == mc_bus_dev) {
- /*
- * IRQ is for the mc_bus_dev's DPRC itself
- */
- error = dprc_set_irq(mc_bus_dev->mc_io,
- MC_CMD_FLAG_INTR_DIS | MC_CMD_FLAG_PRI,
- mc_bus_dev->mc_handle,
- mc_dev_irq->dev_irq_index,
- &irq_cfg);
- if (error < 0) {
- dev_err(&owner_mc_dev->dev,
- "dprc_set_irq() failed: %d\n", error);
- }
- } else {
- /*
- * IRQ is for for a child device of mc_bus_dev
- */
- error = dprc_set_obj_irq(mc_bus_dev->mc_io,
- MC_CMD_FLAG_INTR_DIS | MC_CMD_FLAG_PRI,
- mc_bus_dev->mc_handle,
- owner_mc_dev->obj_desc.type,
- owner_mc_dev->obj_desc.id,
- mc_dev_irq->dev_irq_index,
- &irq_cfg);
- if (error < 0) {
- dev_err(&owner_mc_dev->dev,
- "dprc_obj_set_irq() failed: %d\n", error);
- }
- }
-}
-
-/*
- * NOTE: This function is invoked with interrupts disabled
- */
-static void fsl_mc_msi_write_msg(struct irq_data *irq_data,
- struct msi_msg *msg)
-{
- struct msi_desc *msi_desc = irq_data_get_msi_desc(irq_data);
- struct fsl_mc_device *mc_bus_dev = to_fsl_mc_device(msi_desc->dev);
- struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
- struct fsl_mc_device_irq *mc_dev_irq =
- &mc_bus->irq_resources[msi_desc->fsl_mc.msi_index];
-
- WARN_ON(mc_dev_irq->msi_desc != msi_desc);
- msi_desc->msg = *msg;
-
- /*
- * Program the MSI (paddr, value) pair in the device:
- */
- __fsl_mc_msi_write_msg(mc_bus_dev, mc_dev_irq);
-}
-
-static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)
-{
- struct irq_chip *chip = info->chip;
-
- if (WARN_ON((!chip)))
- return;
-
- /*
- * irq_write_msi_msg should not be set by the caller
- */
- if (chip->irq_write_msi_msg == NULL)
- chip->irq_write_msi_msg = fsl_mc_msi_write_msg;
-}
-
-/**
- * fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain
- * @np: Optional device-tree node of the interrupt controller
- * @info: MSI domain info
- * @parent: Parent irq domain
- *
- * Updates the domain and chip ops and creates a fsl-mc MSI
- * interrupt domain.
- *
- * Returns:
- * A domain pointer or NULL in case of failure.
- */
-struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
- struct msi_domain_info *info,
- struct irq_domain *parent)
-{
- struct irq_domain *domain;
-
- if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
- fsl_mc_msi_update_dom_ops(info);
- if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
- fsl_mc_msi_update_chip_ops(info);
-
- domain = msi_create_irq_domain(fwnode, info, parent);
- if (domain)
- domain->bus_token = DOMAIN_BUS_FSL_MC_MSI;
-
- return domain;
-}
-
-int fsl_mc_find_msi_domain(struct device *mc_platform_dev,
- struct irq_domain **mc_msi_domain)
-{
- struct irq_domain *msi_domain;
- struct device_node *mc_of_node = mc_platform_dev->of_node;
-
- msi_domain = of_msi_get_domain(mc_platform_dev, mc_of_node,
- DOMAIN_BUS_FSL_MC_MSI);
- if (!msi_domain) {
- pr_err("Unable to find fsl-mc MSI domain for %s\n",
- mc_of_node->full_name);
-
- return -ENOENT;
- }
-
- *mc_msi_domain = msi_domain;
- return 0;
-}
-
-static void fsl_mc_msi_free_descs(struct device *dev)
-{
- struct msi_desc *desc, *tmp;
-
- list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
- list_del(&desc->list);
- free_msi_entry(desc);
- }
-}
-
-static int fsl_mc_msi_alloc_descs(struct device *dev, unsigned int irq_count)
-
-{
- unsigned int i;
- int error;
- struct msi_desc *msi_desc;
-
- for (i = 0; i < irq_count; i++) {
- msi_desc = alloc_msi_entry(dev);
- if (!msi_desc) {
- dev_err(dev, "Failed to allocate msi entry\n");
- error = -ENOMEM;
- goto cleanup_msi_descs;
- }
-
- msi_desc->fsl_mc.msi_index = i;
- msi_desc->nvec_used = 1;
- INIT_LIST_HEAD(&msi_desc->list);
- list_add_tail(&msi_desc->list, dev_to_msi_list(dev));
- }
-
- return 0;
-
-cleanup_msi_descs:
- fsl_mc_msi_free_descs(dev);
- return error;
-}
-
-int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
- unsigned int irq_count)
-{
- struct irq_domain *msi_domain;
- int error;
-
- if (WARN_ON(!list_empty(dev_to_msi_list(dev))))
- return -EINVAL;
-
- error = fsl_mc_msi_alloc_descs(dev, irq_count);
- if (error < 0)
- return error;
-
- msi_domain = dev_get_msi_domain(dev);
- if (WARN_ON(!msi_domain)) {
- error = -EINVAL;
- goto cleanup_msi_descs;
- }
-
- /*
- * NOTE: Calling this function will trigger the invocation of the
- * its_fsl_mc_msi_prepare() callback
- */
- error = msi_domain_alloc_irqs(msi_domain, dev, irq_count);
-
- if (error) {
- dev_err(dev, "Failed to allocate IRQs\n");
- goto cleanup_msi_descs;
- }
-
- return 0;
-
-cleanup_msi_descs:
- fsl_mc_msi_free_descs(dev);
- return error;
-}
-
-void fsl_mc_msi_domain_free_irqs(struct device *dev)
-{
- struct irq_domain *msi_domain;
-
- msi_domain = dev_get_msi_domain(dev);
- if (WARN_ON(!msi_domain))
- return;
-
- msi_domain_free_irqs(msi_domain, dev);
-
- if (WARN_ON(list_empty(dev_to_msi_list(dev))))
- return;
-
- fsl_mc_msi_free_descs(dev);
-}
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