irq-eznps.c
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/*
* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/irqchip.h>
#include <soc/nps/common.h>
#define NPS_NR_CPU_IRQS 8 /* number of interrupt lines of NPS400 CPU */
#define NPS_TIMER0_IRQ 3
/*
* NPS400 core includes an Interrupt Controller (IC) support.
* All cores can deactivate level irqs at first level control
* at cores mesh layer called MTM.
* For devices out side chip e.g. uart, network there is another
* level called Global Interrupt Manager (GIM).
* This second level can control level and edge interrupt.
*
* NOTE: AUX_IENABLE and CTOP_AUX_IACK are auxiliary registers
* with private HW copy per CPU.
*/
static void nps400_irq_mask(struct irq_data *irqd)
{
unsigned int ienb;
unsigned int irq = irqd_to_hwirq(irqd);
ienb = read_aux_reg(AUX_IENABLE);
ienb &= ~(1 << irq);
write_aux_reg(AUX_IENABLE, ienb);
}
static void nps400_irq_unmask(struct irq_data *irqd)
{
unsigned int ienb;
unsigned int irq = irqd_to_hwirq(irqd);
ienb = read_aux_reg(AUX_IENABLE);
ienb |= (1 << irq);
write_aux_reg(AUX_IENABLE, ienb);
}
static void nps400_irq_eoi_global(struct irq_data *irqd)
{
unsigned int __maybe_unused irq = irqd_to_hwirq(irqd);
write_aux_reg(CTOP_AUX_IACK, 1 << irq);
/* Don't ack GIC before all device access attempts are done */
mb();
nps_ack_gic();
}
static void nps400_irq_ack(struct irq_data *irqd)
{
unsigned int __maybe_unused irq = irqd_to_hwirq(irqd);
write_aux_reg(CTOP_AUX_IACK, 1 << irq);
}
static struct irq_chip nps400_irq_chip_fasteoi = {
.name = "NPS400 IC Global",
.irq_mask = nps400_irq_mask,
.irq_unmask = nps400_irq_unmask,
.irq_eoi = nps400_irq_eoi_global,
};
static struct irq_chip nps400_irq_chip_percpu = {
.name = "NPS400 IC",
.irq_mask = nps400_irq_mask,
.irq_unmask = nps400_irq_unmask,
.irq_ack = nps400_irq_ack,
};
static int nps400_irq_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw)
{
switch (hw) {
case NPS_TIMER0_IRQ:
#ifdef CONFIG_SMP
case NPS_IPI_IRQ:
#endif
irq_set_percpu_devid(virq);
irq_set_chip_and_handler(virq, &nps400_irq_chip_percpu,
handle_percpu_devid_irq);
break;
default:
irq_set_chip_and_handler(virq, &nps400_irq_chip_fasteoi,
handle_fasteoi_irq);
break;
}
return 0;
}
static const struct irq_domain_ops nps400_irq_ops = {
.xlate = irq_domain_xlate_onecell,
.map = nps400_irq_map,
};
static int __init nps400_of_init(struct device_node *node,
struct device_node *parent)
{
struct irq_domain *nps400_root_domain;
if (parent) {
pr_err("DeviceTree incore ic not a root irq controller\n");
return -EINVAL;
}
nps400_root_domain = irq_domain_add_linear(node, NPS_NR_CPU_IRQS,
&nps400_irq_ops, NULL);
if (!nps400_root_domain) {
pr_err("nps400 root irq domain not avail\n");
return -ENOMEM;
}
/*
* Needed for primary domain lookup to succeed
* This is a primary irqchip, and can never have a parent
*/
irq_set_default_host(nps400_root_domain);
#ifdef CONFIG_SMP
irq_create_mapping(nps400_root_domain, NPS_IPI_IRQ);
#endif
return 0;
}
IRQCHIP_DECLARE(ezchip_nps400_ic, "ezchip,nps400-ic", nps400_of_init);