mirror of https://gitee.com/openkylin/linux.git
251 lines
5.9 KiB
C
251 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com>
|
|
* Loongson PCH MSI support
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "pch-msi: " fmt
|
|
|
|
#include <linux/irqchip.h>
|
|
#include <linux/msi.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/of_pci.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct pch_msi_data {
|
|
struct mutex msi_map_lock;
|
|
phys_addr_t doorbell;
|
|
u32 irq_first; /* The vector number that MSIs starts */
|
|
u32 num_irqs; /* The number of vectors for MSIs */
|
|
unsigned long *msi_map;
|
|
};
|
|
|
|
static void pch_msi_mask_msi_irq(struct irq_data *d)
|
|
{
|
|
pci_msi_mask_irq(d);
|
|
irq_chip_mask_parent(d);
|
|
}
|
|
|
|
static void pch_msi_unmask_msi_irq(struct irq_data *d)
|
|
{
|
|
irq_chip_unmask_parent(d);
|
|
pci_msi_unmask_irq(d);
|
|
}
|
|
|
|
static struct irq_chip pch_msi_irq_chip = {
|
|
.name = "PCH PCI MSI",
|
|
.irq_mask = pch_msi_mask_msi_irq,
|
|
.irq_unmask = pch_msi_unmask_msi_irq,
|
|
.irq_ack = irq_chip_ack_parent,
|
|
.irq_set_affinity = irq_chip_set_affinity_parent,
|
|
};
|
|
|
|
static int pch_msi_allocate_hwirq(struct pch_msi_data *priv, int num_req)
|
|
{
|
|
int first;
|
|
|
|
mutex_lock(&priv->msi_map_lock);
|
|
|
|
first = bitmap_find_free_region(priv->msi_map, priv->num_irqs,
|
|
get_count_order(num_req));
|
|
if (first < 0) {
|
|
mutex_unlock(&priv->msi_map_lock);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
mutex_unlock(&priv->msi_map_lock);
|
|
|
|
return priv->irq_first + first;
|
|
}
|
|
|
|
static void pch_msi_free_hwirq(struct pch_msi_data *priv,
|
|
int hwirq, int num_req)
|
|
{
|
|
int first = hwirq - priv->irq_first;
|
|
|
|
mutex_lock(&priv->msi_map_lock);
|
|
bitmap_release_region(priv->msi_map, first, get_count_order(num_req));
|
|
mutex_unlock(&priv->msi_map_lock);
|
|
}
|
|
|
|
static void pch_msi_compose_msi_msg(struct irq_data *data,
|
|
struct msi_msg *msg)
|
|
{
|
|
struct pch_msi_data *priv = irq_data_get_irq_chip_data(data);
|
|
|
|
msg->address_hi = upper_32_bits(priv->doorbell);
|
|
msg->address_lo = lower_32_bits(priv->doorbell);
|
|
msg->data = data->hwirq;
|
|
}
|
|
|
|
static struct msi_domain_info pch_msi_domain_info = {
|
|
.flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
|
|
MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
|
|
.chip = &pch_msi_irq_chip,
|
|
};
|
|
|
|
static struct irq_chip middle_irq_chip = {
|
|
.name = "PCH MSI",
|
|
.irq_mask = irq_chip_mask_parent,
|
|
.irq_unmask = irq_chip_unmask_parent,
|
|
.irq_ack = irq_chip_ack_parent,
|
|
.irq_set_affinity = irq_chip_set_affinity_parent,
|
|
.irq_compose_msi_msg = pch_msi_compose_msi_msg,
|
|
};
|
|
|
|
static int pch_msi_parent_domain_alloc(struct irq_domain *domain,
|
|
unsigned int virq, int hwirq)
|
|
{
|
|
struct irq_fwspec fwspec;
|
|
|
|
fwspec.fwnode = domain->parent->fwnode;
|
|
fwspec.param_count = 1;
|
|
fwspec.param[0] = hwirq;
|
|
|
|
return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
|
|
}
|
|
|
|
static int pch_msi_middle_domain_alloc(struct irq_domain *domain,
|
|
unsigned int virq,
|
|
unsigned int nr_irqs, void *args)
|
|
{
|
|
struct pch_msi_data *priv = domain->host_data;
|
|
int hwirq, err, i;
|
|
|
|
hwirq = pch_msi_allocate_hwirq(priv, nr_irqs);
|
|
if (hwirq < 0)
|
|
return hwirq;
|
|
|
|
for (i = 0; i < nr_irqs; i++) {
|
|
err = pch_msi_parent_domain_alloc(domain, virq + i, hwirq + i);
|
|
if (err)
|
|
goto err_hwirq;
|
|
|
|
irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
|
|
&middle_irq_chip, priv);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_hwirq:
|
|
pch_msi_free_hwirq(priv, hwirq, nr_irqs);
|
|
irq_domain_free_irqs_parent(domain, virq, i - 1);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void pch_msi_middle_domain_free(struct irq_domain *domain,
|
|
unsigned int virq,
|
|
unsigned int nr_irqs)
|
|
{
|
|
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
|
|
struct pch_msi_data *priv = irq_data_get_irq_chip_data(d);
|
|
|
|
irq_domain_free_irqs_parent(domain, virq, nr_irqs);
|
|
pch_msi_free_hwirq(priv, d->hwirq, nr_irqs);
|
|
}
|
|
|
|
static const struct irq_domain_ops pch_msi_middle_domain_ops = {
|
|
.alloc = pch_msi_middle_domain_alloc,
|
|
.free = pch_msi_middle_domain_free,
|
|
};
|
|
|
|
static int pch_msi_init_domains(struct pch_msi_data *priv,
|
|
struct device_node *node,
|
|
struct irq_domain *parent)
|
|
{
|
|
struct irq_domain *middle_domain, *msi_domain;
|
|
|
|
middle_domain = irq_domain_create_linear(of_node_to_fwnode(node),
|
|
priv->num_irqs,
|
|
&pch_msi_middle_domain_ops,
|
|
priv);
|
|
if (!middle_domain) {
|
|
pr_err("Failed to create the MSI middle domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
middle_domain->parent = parent;
|
|
irq_domain_update_bus_token(middle_domain, DOMAIN_BUS_NEXUS);
|
|
|
|
msi_domain = pci_msi_create_irq_domain(of_node_to_fwnode(node),
|
|
&pch_msi_domain_info,
|
|
middle_domain);
|
|
if (!msi_domain) {
|
|
pr_err("Failed to create PCI MSI domain\n");
|
|
irq_domain_remove(middle_domain);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pch_msi_init(struct device_node *node,
|
|
struct device_node *parent)
|
|
{
|
|
struct pch_msi_data *priv;
|
|
struct irq_domain *parent_domain;
|
|
struct resource res;
|
|
int ret;
|
|
|
|
parent_domain = irq_find_host(parent);
|
|
if (!parent_domain) {
|
|
pr_err("Failed to find the parent domain\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&priv->msi_map_lock);
|
|
|
|
ret = of_address_to_resource(node, 0, &res);
|
|
if (ret) {
|
|
pr_err("Failed to allocate resource\n");
|
|
goto err_priv;
|
|
}
|
|
|
|
priv->doorbell = res.start;
|
|
|
|
if (of_property_read_u32(node, "loongson,msi-base-vec",
|
|
&priv->irq_first)) {
|
|
pr_err("Unable to parse MSI vec base\n");
|
|
ret = -EINVAL;
|
|
goto err_priv;
|
|
}
|
|
|
|
if (of_property_read_u32(node, "loongson,msi-num-vecs",
|
|
&priv->num_irqs)) {
|
|
pr_err("Unable to parse MSI vec number\n");
|
|
ret = -EINVAL;
|
|
goto err_priv;
|
|
}
|
|
|
|
priv->msi_map = bitmap_alloc(priv->num_irqs, GFP_KERNEL);
|
|
if (!priv->msi_map) {
|
|
ret = -ENOMEM;
|
|
goto err_priv;
|
|
}
|
|
|
|
pr_debug("Registering %d MSIs, starting at %d\n",
|
|
priv->num_irqs, priv->irq_first);
|
|
|
|
ret = pch_msi_init_domains(priv, node, parent_domain);
|
|
if (ret)
|
|
goto err_map;
|
|
|
|
return 0;
|
|
|
|
err_map:
|
|
kfree(priv->msi_map);
|
|
err_priv:
|
|
kfree(priv);
|
|
return ret;
|
|
}
|
|
|
|
IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_init);
|