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// SPDX-License-Identifier: GPL-2.0
/*
* Freescale Management Complex (MC) bus driver MSI support
*
* Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
* Author: German Rivera <German.Rivera@freescale.com>
*
*/
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
#include <linux/acpi_iort.h>
#include "fsl-mc-private.h"
#ifdef GENERIC_MSI_DOMAIN_OPS
/*
* 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->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);
}
#else
#define fsl_mc_msi_set_desc NULL
#endif
static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info)
{
struct msi_domain_ops *ops = info->ops;
if (!ops)
return;
/*
* set_desc should not be set by the caller
*/
if (!ops->set_desc)
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,
struct msi_desc *msi_desc)
{
int error;
struct fsl_mc_device *owner_mc_dev = mc_dev_irq->mc_dev;
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 (!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->msi_index];
msi_desc->msg = *msg;
/*
* Program the MSI (paddr, value) pair in the device:
*/
__fsl_mc_msi_write_msg(mc_bus_dev, mc_dev_irq, msi_desc);
}
static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)
{
struct irq_chip *chip = info->chip;
if (!chip)
return;
/*
* irq_write_msi_msg should not be set by the caller
*/
if (!chip->irq_write_msi_msg)
chip->irq_write_msi_msg = fsl_mc_msi_write_msg;
}
/**
* fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain
* @fwnode: Optional firmware 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 (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE)))
info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
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);
info->flags |= MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;
domain = msi_create_irq_domain(fwnode, info, parent);
if (domain)
irq_domain_update_bus_token(domain, DOMAIN_BUS_FSL_MC_MSI);
return domain;
}
struct irq_domain *fsl_mc_find_msi_domain(struct device *dev)
{
struct device *root_dprc_dev;
struct device *bus_dev;
struct irq_domain *msi_domain;
struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
fsl_mc_get_root_dprc(dev, &root_dprc_dev);
bus_dev = root_dprc_dev->parent;
if (bus_dev->of_node) {
msi_domain = of_msi_map_get_device_domain(dev,
mc_dev->icid,
DOMAIN_BUS_FSL_MC_MSI);
/*
* if the msi-map property is missing assume that all the
* child containers inherit the domain from the parent
*/
if (!msi_domain)
msi_domain = of_msi_get_domain(bus_dev,
bus_dev->of_node,
DOMAIN_BUS_FSL_MC_MSI);
} else {
msi_domain = iort_get_device_domain(dev, mc_dev->icid,
DOMAIN_BUS_FSL_MC_MSI);
}
return msi_domain;
}
int fsl_mc_msi_domain_alloc_irqs(struct device *dev, unsigned int irq_count)
{
struct irq_domain *msi_domain;
int error;
msi_domain = dev_get_msi_domain(dev);
if (!msi_domain)
return -EINVAL;
error = msi_setup_device_data(dev);
if (error)
return error;
if (msi_first_desc(dev, MSI_DESC_ALL))
return -EINVAL;
/*
* 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");
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 (!msi_domain)
return;
msi_domain_free_irqs(msi_domain, dev);
}
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