mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
320 lines
8.1 KiB
C
320 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Cristian Birsan <cristian.birsan@microchip.com>
|
|
* Joshua Henderson <joshua.henderson@microchip.com>
|
|
* Copyright (C) 2016 Microchip Technology Inc. All rights reserved.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/io.h>
|
|
#include <linux/irqchip.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/irq.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/mach-pic32/pic32.h>
|
|
|
|
#define REG_INTCON 0x0000
|
|
#define REG_INTSTAT 0x0020
|
|
#define REG_IFS_OFFSET 0x0040
|
|
#define REG_IEC_OFFSET 0x00C0
|
|
#define REG_IPC_OFFSET 0x0140
|
|
#define REG_OFF_OFFSET 0x0540
|
|
|
|
#define MAJPRI_MASK 0x07
|
|
#define SUBPRI_MASK 0x03
|
|
#define PRIORITY_MASK 0x1F
|
|
|
|
#define PIC32_INT_PRI(pri, subpri) \
|
|
((((pri) & MAJPRI_MASK) << 2) | ((subpri) & SUBPRI_MASK))
|
|
|
|
struct evic_chip_data {
|
|
u32 irq_types[NR_IRQS];
|
|
u32 ext_irqs[8];
|
|
};
|
|
|
|
static struct irq_domain *evic_irq_domain;
|
|
static void __iomem *evic_base;
|
|
|
|
asmlinkage void __weak plat_irq_dispatch(void)
|
|
{
|
|
unsigned int irq, hwirq;
|
|
|
|
hwirq = readl(evic_base + REG_INTSTAT) & 0xFF;
|
|
irq = irq_linear_revmap(evic_irq_domain, hwirq);
|
|
do_IRQ(irq);
|
|
}
|
|
|
|
static struct evic_chip_data *irqd_to_priv(struct irq_data *data)
|
|
{
|
|
return (struct evic_chip_data *)data->domain->host_data;
|
|
}
|
|
|
|
static int pic32_set_ext_polarity(int bit, u32 type)
|
|
{
|
|
/*
|
|
* External interrupts can be either edge rising or edge falling,
|
|
* but not both.
|
|
*/
|
|
switch (type) {
|
|
case IRQ_TYPE_EDGE_RISING:
|
|
writel(BIT(bit), evic_base + PIC32_SET(REG_INTCON));
|
|
break;
|
|
case IRQ_TYPE_EDGE_FALLING:
|
|
writel(BIT(bit), evic_base + PIC32_CLR(REG_INTCON));
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pic32_set_type_edge(struct irq_data *data,
|
|
unsigned int flow_type)
|
|
{
|
|
struct evic_chip_data *priv = irqd_to_priv(data);
|
|
int ret;
|
|
int i;
|
|
|
|
if (!(flow_type & IRQ_TYPE_EDGE_BOTH))
|
|
return -EBADR;
|
|
|
|
/* set polarity for external interrupts only */
|
|
for (i = 0; i < ARRAY_SIZE(priv->ext_irqs); i++) {
|
|
if (priv->ext_irqs[i] == data->hwirq) {
|
|
ret = pic32_set_ext_polarity(i, flow_type);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
irqd_set_trigger_type(data, flow_type);
|
|
|
|
return IRQ_SET_MASK_OK;
|
|
}
|
|
|
|
static void pic32_bind_evic_interrupt(int irq, int set)
|
|
{
|
|
writel(set, evic_base + REG_OFF_OFFSET + irq * 4);
|
|
}
|
|
|
|
static void pic32_set_irq_priority(int irq, int priority)
|
|
{
|
|
u32 reg, shift;
|
|
|
|
reg = irq / 4;
|
|
shift = (irq % 4) * 8;
|
|
|
|
writel(PRIORITY_MASK << shift,
|
|
evic_base + PIC32_CLR(REG_IPC_OFFSET + reg * 0x10));
|
|
writel(priority << shift,
|
|
evic_base + PIC32_SET(REG_IPC_OFFSET + reg * 0x10));
|
|
}
|
|
|
|
#define IRQ_REG_MASK(_hwirq, _reg, _mask) \
|
|
do { \
|
|
_reg = _hwirq / 32; \
|
|
_mask = 1 << (_hwirq % 32); \
|
|
} while (0)
|
|
|
|
static int pic32_irq_domain_map(struct irq_domain *d, unsigned int virq,
|
|
irq_hw_number_t hw)
|
|
{
|
|
struct evic_chip_data *priv = d->host_data;
|
|
struct irq_data *data;
|
|
int ret;
|
|
u32 iecclr, ifsclr;
|
|
u32 reg, mask;
|
|
|
|
ret = irq_map_generic_chip(d, virq, hw);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Piggyback on xlate function to move to an alternate chip as necessary
|
|
* at time of mapping instead of allowing the flow handler/chip to be
|
|
* changed later. This requires all interrupts to be configured through
|
|
* DT.
|
|
*/
|
|
if (priv->irq_types[hw] & IRQ_TYPE_SENSE_MASK) {
|
|
data = irq_domain_get_irq_data(d, virq);
|
|
irqd_set_trigger_type(data, priv->irq_types[hw]);
|
|
irq_setup_alt_chip(data, priv->irq_types[hw]);
|
|
}
|
|
|
|
IRQ_REG_MASK(hw, reg, mask);
|
|
|
|
iecclr = PIC32_CLR(REG_IEC_OFFSET + reg * 0x10);
|
|
ifsclr = PIC32_CLR(REG_IFS_OFFSET + reg * 0x10);
|
|
|
|
/* mask and clear flag */
|
|
writel(mask, evic_base + iecclr);
|
|
writel(mask, evic_base + ifsclr);
|
|
|
|
/* default priority is required */
|
|
pic32_set_irq_priority(hw, PIC32_INT_PRI(2, 0));
|
|
|
|
return ret;
|
|
}
|
|
|
|
int pic32_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
|
|
const u32 *intspec, unsigned int intsize,
|
|
irq_hw_number_t *out_hwirq, unsigned int *out_type)
|
|
{
|
|
struct evic_chip_data *priv = d->host_data;
|
|
|
|
if (WARN_ON(intsize < 2))
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON(intspec[0] >= NR_IRQS))
|
|
return -EINVAL;
|
|
|
|
*out_hwirq = intspec[0];
|
|
*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
|
|
|
|
priv->irq_types[intspec[0]] = intspec[1] & IRQ_TYPE_SENSE_MASK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops pic32_irq_domain_ops = {
|
|
.map = pic32_irq_domain_map,
|
|
.xlate = pic32_irq_domain_xlate,
|
|
};
|
|
|
|
static void __init pic32_ext_irq_of_init(struct irq_domain *domain)
|
|
{
|
|
struct device_node *node = irq_domain_get_of_node(domain);
|
|
struct evic_chip_data *priv = domain->host_data;
|
|
struct property *prop;
|
|
const __le32 *p;
|
|
u32 hwirq;
|
|
int i = 0;
|
|
const char *pname = "microchip,external-irqs";
|
|
|
|
of_property_for_each_u32(node, pname, prop, p, hwirq) {
|
|
if (i >= ARRAY_SIZE(priv->ext_irqs)) {
|
|
pr_warn("More than %d external irq, skip rest\n",
|
|
ARRAY_SIZE(priv->ext_irqs));
|
|
break;
|
|
}
|
|
|
|
priv->ext_irqs[i] = hwirq;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
static int __init pic32_of_init(struct device_node *node,
|
|
struct device_node *parent)
|
|
{
|
|
struct irq_chip_generic *gc;
|
|
struct evic_chip_data *priv;
|
|
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
|
|
int nchips, ret;
|
|
int i;
|
|
|
|
nchips = DIV_ROUND_UP(NR_IRQS, 32);
|
|
|
|
evic_base = of_iomap(node, 0);
|
|
if (!evic_base)
|
|
return -ENOMEM;
|
|
|
|
priv = kcalloc(nchips, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv) {
|
|
ret = -ENOMEM;
|
|
goto err_iounmap;
|
|
}
|
|
|
|
evic_irq_domain = irq_domain_add_linear(node, nchips * 32,
|
|
&pic32_irq_domain_ops,
|
|
priv);
|
|
if (!evic_irq_domain) {
|
|
ret = -ENOMEM;
|
|
goto err_free_priv;
|
|
}
|
|
|
|
/*
|
|
* The PIC32 EVIC has a linear list of irqs and the type of each
|
|
* irq is determined by the hardware peripheral the EVIC is arbitrating.
|
|
* These irq types are defined in the datasheet as "persistent" and
|
|
* "non-persistent" which are mapped here to level and edge
|
|
* respectively. To manage the different flow handler requirements of
|
|
* each irq type, different chip_types are used.
|
|
*/
|
|
ret = irq_alloc_domain_generic_chips(evic_irq_domain, 32, 2,
|
|
"evic-level", handle_level_irq,
|
|
clr, 0, 0);
|
|
if (ret)
|
|
goto err_domain_remove;
|
|
|
|
board_bind_eic_interrupt = &pic32_bind_evic_interrupt;
|
|
|
|
for (i = 0; i < nchips; i++) {
|
|
u32 ifsclr = PIC32_CLR(REG_IFS_OFFSET + (i * 0x10));
|
|
u32 iec = REG_IEC_OFFSET + (i * 0x10);
|
|
|
|
gc = irq_get_domain_generic_chip(evic_irq_domain, i * 32);
|
|
|
|
gc->reg_base = evic_base;
|
|
gc->unused = 0;
|
|
|
|
/*
|
|
* Level/persistent interrupts have a special requirement that
|
|
* the condition generating the interrupt be cleared before the
|
|
* interrupt flag (ifs) can be cleared. chip.irq_eoi is used to
|
|
* complete the interrupt with an ack.
|
|
*/
|
|
gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
|
|
gc->chip_types[0].handler = handle_fasteoi_irq;
|
|
gc->chip_types[0].regs.ack = ifsclr;
|
|
gc->chip_types[0].regs.mask = iec;
|
|
gc->chip_types[0].chip.name = "evic-level";
|
|
gc->chip_types[0].chip.irq_eoi = irq_gc_ack_set_bit;
|
|
gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
|
|
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
|
|
gc->chip_types[0].chip.flags = IRQCHIP_SKIP_SET_WAKE;
|
|
|
|
/* Edge interrupts */
|
|
gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
|
|
gc->chip_types[1].handler = handle_edge_irq;
|
|
gc->chip_types[1].regs.ack = ifsclr;
|
|
gc->chip_types[1].regs.mask = iec;
|
|
gc->chip_types[1].chip.name = "evic-edge";
|
|
gc->chip_types[1].chip.irq_ack = irq_gc_ack_set_bit;
|
|
gc->chip_types[1].chip.irq_mask = irq_gc_mask_clr_bit;
|
|
gc->chip_types[1].chip.irq_unmask = irq_gc_mask_set_bit;
|
|
gc->chip_types[1].chip.irq_set_type = pic32_set_type_edge;
|
|
gc->chip_types[1].chip.flags = IRQCHIP_SKIP_SET_WAKE;
|
|
|
|
gc->private = &priv[i];
|
|
}
|
|
|
|
irq_set_default_host(evic_irq_domain);
|
|
|
|
/*
|
|
* External interrupts have software configurable edge polarity. These
|
|
* interrupts are defined in DT allowing polarity to be configured only
|
|
* for these interrupts when requested.
|
|
*/
|
|
pic32_ext_irq_of_init(evic_irq_domain);
|
|
|
|
return 0;
|
|
|
|
err_domain_remove:
|
|
irq_domain_remove(evic_irq_domain);
|
|
|
|
err_free_priv:
|
|
kfree(priv);
|
|
|
|
err_iounmap:
|
|
iounmap(evic_base);
|
|
|
|
return ret;
|
|
}
|
|
|
|
IRQCHIP_DECLARE(pic32_evic, "microchip,pic32mzda-evic", pic32_of_init);
|