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/*
* Copyright (C) 2016 Marvell
*
* Thomas Petazzoni <thomas.petazzoni@free-electrons.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.
*/
#define pr_fmt(fmt) "GIC-ODMI: " fmt
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#define GICP_ODMIN_SET 0x40
#define GICP_ODMI_INT_NUM_SHIFT 12
#define GICP_ODMIN_GM_EP_R0 0x110
#define GICP_ODMIN_GM_EP_R1 0x114
#define GICP_ODMIN_GM_EA_R0 0x108
#define GICP_ODMIN_GM_EA_R1 0x118
/*
* We don't support the group events, so we simply have 8 interrupts
* per frame.
*/
#define NODMIS_SHIFT 3
#define NODMIS_PER_FRAME (1 << NODMIS_SHIFT)
#define NODMIS_MASK (NODMIS_PER_FRAME - 1)
struct odmi_data {
struct resource res;
void __iomem *base;
unsigned int spi_base;
};
static struct odmi_data *odmis;
static unsigned long *odmis_bm;
static unsigned int odmis_count;
/* Protects odmis_bm */
static DEFINE_SPINLOCK(odmis_bm_lock);
static void odmi_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
{
struct odmi_data *odmi;
phys_addr_t addr;
unsigned int odmin;
if (WARN_ON(d->hwirq >= odmis_count * NODMIS_PER_FRAME))
return;
odmi = &odmis[d->hwirq >> NODMIS_SHIFT];
odmin = d->hwirq & NODMIS_MASK;
addr = odmi->res.start + GICP_ODMIN_SET;
msg->address_hi = upper_32_bits(addr);
msg->address_lo = lower_32_bits(addr);
msg->data = odmin << GICP_ODMI_INT_NUM_SHIFT;
}
static struct irq_chip odmi_irq_chip = {
.name = "ODMI",
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_eoi = irq_chip_eoi_parent,
.irq_set_affinity = irq_chip_set_affinity_parent,
.irq_compose_msi_msg = odmi_compose_msi_msg,
};
static int odmi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *args)
{
struct odmi_data *odmi = NULL;
struct irq_fwspec fwspec;
struct irq_data *d;
unsigned int hwirq, odmin;
int ret;
spin_lock(&odmis_bm_lock);
hwirq = find_first_zero_bit(odmis_bm, NODMIS_PER_FRAME * odmis_count);
if (hwirq >= NODMIS_PER_FRAME * odmis_count) {
spin_unlock(&odmis_bm_lock);
return -ENOSPC;
}
__set_bit(hwirq, odmis_bm);
spin_unlock(&odmis_bm_lock);
odmi = &odmis[hwirq >> NODMIS_SHIFT];
odmin = hwirq & NODMIS_MASK;
fwspec.fwnode = domain->parent->fwnode;
fwspec.param_count = 3;
fwspec.param[0] = GIC_SPI;
fwspec.param[1] = odmi->spi_base - 32 + odmin;
fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
if (ret) {
pr_err("Cannot allocate parent IRQ\n");
spin_lock(&odmis_bm_lock);
__clear_bit(odmin, odmis_bm);
spin_unlock(&odmis_bm_lock);
return ret;
}
/* Configure the interrupt line to be edge */
d = irq_domain_get_irq_data(domain->parent, virq);
d->chip->irq_set_type(d, IRQ_TYPE_EDGE_RISING);
irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
&odmi_irq_chip, NULL);
return 0;
}
static void odmi_irq_domain_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
if (d->hwirq >= odmis_count * NODMIS_PER_FRAME) {
pr_err("Failed to teardown msi. Invalid hwirq %lu\n", d->hwirq);
return;
}
irq_domain_free_irqs_parent(domain, virq, nr_irqs);
/* Actually free the MSI */
spin_lock(&odmis_bm_lock);
__clear_bit(d->hwirq, odmis_bm);
spin_unlock(&odmis_bm_lock);
}
static const struct irq_domain_ops odmi_domain_ops = {
.alloc = odmi_irq_domain_alloc,
.free = odmi_irq_domain_free,
};
static struct irq_chip odmi_msi_irq_chip = {
.name = "ODMI",
};
static struct msi_domain_ops odmi_msi_ops = {
};
static struct msi_domain_info odmi_msi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
.ops = &odmi_msi_ops,
.chip = &odmi_msi_irq_chip,
};
static int __init mvebu_odmi_init(struct device_node *node,
struct device_node *parent)
{
struct irq_domain *inner_domain, *plat_domain;
int ret, i;
if (of_property_read_u32(node, "marvell,odmi-frames", &odmis_count))
return -EINVAL;
odmis = kcalloc(odmis_count, sizeof(struct odmi_data), GFP_KERNEL);
if (!odmis)
return -ENOMEM;
odmis_bm = bitmap_zalloc(odmis_count * NODMIS_PER_FRAME, GFP_KERNEL);
if (!odmis_bm) {
ret = -ENOMEM;
goto err_alloc;
}
for (i = 0; i < odmis_count; i++) {
struct odmi_data *odmi = &odmis[i];
ret = of_address_to_resource(node, i, &odmi->res);
if (ret)
goto err_unmap;
odmi->base = of_io_request_and_map(node, i, "odmi");
if (IS_ERR(odmi->base)) {
ret = PTR_ERR(odmi->base);
goto err_unmap;
}
if (of_property_read_u32_index(node, "marvell,spi-base",
i, &odmi->spi_base)) {
ret = -EINVAL;
goto err_unmap;
}
}
inner_domain = irq_domain_create_linear(of_node_to_fwnode(node),
odmis_count * NODMIS_PER_FRAME,
&odmi_domain_ops, NULL);
if (!inner_domain) {
ret = -ENOMEM;
goto err_unmap;
}
inner_domain->parent = irq_find_host(parent);
plat_domain = platform_msi_create_irq_domain(of_node_to_fwnode(node),
&odmi_msi_domain_info,
inner_domain);
if (!plat_domain) {
ret = -ENOMEM;
goto err_remove_inner;
}
return 0;
err_remove_inner:
irq_domain_remove(inner_domain);
err_unmap:
for (i = 0; i < odmis_count; i++) {
struct odmi_data *odmi = &odmis[i];
if (odmi->base && !IS_ERR(odmi->base))
iounmap(odmis[i].base);
}
bitmap_free(odmis_bm);
err_alloc:
kfree(odmis);
return ret;
}
IRQCHIP_DECLARE(mvebu_odmi, "marvell,odmi-controller", mvebu_odmi_init);
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