/*
* Atmel AT91 common AIC (Advanced Interrupt Controller) code shared by
* irq-atmel-aic and irq-atmel-aic5 drivers
*
* Copyright (C) 2004 SAN People
* Copyright (C) 2004 ATMEL
* Copyright (C) Rick Bronson
* Copyright (C) 2014 Free Electrons
*
* Author: Boris BREZILLON <boris.brezillon@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.
*/
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include "irq-atmel-aic-common.h"
#define AT91_AIC_PRIOR GENMASK(2, 0)
#define AT91_AIC_IRQ_MIN_PRIORITY 0
#define AT91_AIC_IRQ_MAX_PRIORITY 7
#define AT91_AIC_SRCTYPE GENMASK(6, 5)
#define AT91_AIC_SRCTYPE_LOW (0 << 5)
#define AT91_AIC_SRCTYPE_FALLING (1 << 5)
#define AT91_AIC_SRCTYPE_HIGH (2 << 5)
#define AT91_AIC_SRCTYPE_RISING (3 << 5)
struct aic_chip_data {
u32 ext_irqs;
};
static void aic_common_shutdown(struct irq_data *d)
{
struct irq_chip_type *ct = irq_data_get_chip_type(d);
ct->chip.irq_mask(d);
}
int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct aic_chip_data *aic = gc->private;
unsigned aic_type;
switch (type) {
case IRQ_TYPE_LEVEL_HIGH:
aic_type = AT91_AIC_SRCTYPE_HIGH;
break;
case IRQ_TYPE_EDGE_RISING:
aic_type = AT91_AIC_SRCTYPE_RISING;
break;
case IRQ_TYPE_LEVEL_LOW:
if (!(d->mask & aic->ext_irqs))
return -EINVAL;
aic_type = AT91_AIC_SRCTYPE_LOW;
break;
case IRQ_TYPE_EDGE_FALLING:
if (!(d->mask & aic->ext_irqs))
return -EINVAL;
aic_type = AT91_AIC_SRCTYPE_FALLING;
break;
default:
return -EINVAL;
}
*val &= ~AT91_AIC_SRCTYPE;
*val |= aic_type;
return 0;
}
void aic_common_set_priority(int priority, unsigned *val)
{
*val &= ~AT91_AIC_PRIOR;
*val |= priority;
}
int aic_common_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)
{
if (WARN_ON(intsize < 3))
return -EINVAL;
if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) ||
(intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY)))
return -EINVAL;
*out_hwirq = intspec[0];
*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
return 0;
}
static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
{
struct device_node *node = irq_domain_get_of_node(domain);
struct irq_chip_generic *gc;
struct aic_chip_data *aic;
struct property *prop;
const __be32 *p;
u32 hwirq;
gc = irq_get_domain_generic_chip(domain, 0);
aic = gc->private;
aic->ext_irqs |= 1;
of_property_for_each_u32(node, "atmel,external-irqs", prop, p, hwirq) {
gc = irq_get_domain_generic_chip(domain, hwirq);
if (!gc) {
pr_warn("AIC: external irq %d >= %d skip it\n",
hwirq, domain->revmap_size);
continue;
}
aic = gc->private;
aic->ext_irqs |= (1 << (hwirq % 32));
}
}
#define AT91_RTC_IDR 0x24
#define AT91_RTC_IMR 0x28
#define AT91_RTC_IRQ_MASK 0x1f
void __init aic_common_rtc_irq_fixup(void)
{
struct device_node *np;
void __iomem *regs;
np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-rtc");
if (!np)
np = of_find_compatible_node(NULL, NULL,
"atmel,at91sam9x5-rtc");
if (!np)
return;
regs = of_iomap(np, 0);
of_node_put(np);
if (!regs)
return;
writel(AT91_RTC_IRQ_MASK, regs + AT91_RTC_IDR);
iounmap(regs);
}
#define AT91_RTT_MR 0x00 /* Real-time Mode Register */
#define AT91_RTT_ALMIEN (1 << 16) /* Alarm Interrupt Enable */
#define AT91_RTT_RTTINCIEN (1 << 17) /* Real Time Timer Increment Interrupt Enable */
void __init aic_common_rtt_irq_fixup(void)
{
struct device_node *np;
void __iomem *regs;
/*
* The at91sam9263 SoC has 2 instances of the RTT block, hence we
* iterate over the DT to find each occurrence.
*/
for_each_compatible_node(np, NULL, "atmel,at91sam9260-rtt") {
regs = of_iomap(np, 0);
if (!regs)
continue;
writel(readl(regs + AT91_RTT_MR) &
~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN),
regs + AT91_RTT_MR);
iounmap(regs);
}
}
static void __init aic_common_irq_fixup(const struct of_device_id *matches)
{
struct device_node *root = of_find_node_by_path("/");
const struct of_device_id *match;
if (!root)
return;
match = of_match_node(matches, root);
if (match) {
void (*fixup)(void) = match->data;
fixup();
}
of_node_put(root);
}
struct irq_domain *__init aic_common_of_init(struct device_node *node,
const struct irq_domain_ops *ops,
const char *name, int nirqs,
const struct of_device_id *matches)
{
struct irq_chip_generic *gc;
struct irq_domain *domain;
struct aic_chip_data *aic;
void __iomem *reg_base;
int nchips;
int ret;
int i;
nchips = DIV_ROUND_UP(nirqs, 32);
reg_base = of_iomap(node, 0);
if (!reg_base)
return ERR_PTR(-ENOMEM);
aic = kcalloc(nchips, sizeof(*aic), GFP_KERNEL);
if (!aic) {
ret = -ENOMEM;
goto err_iounmap;
}
domain = irq_domain_add_linear(node, nchips * 32, ops, aic);
if (!domain) {
ret = -ENOMEM;
goto err_free_aic;
}
ret = irq_alloc_domain_generic_chips(domain, 32, 1, name,
handle_fasteoi_irq,
IRQ_NOREQUEST | IRQ_NOPROBE |
IRQ_NOAUTOEN, 0, 0);
if (ret)
goto err_domain_remove;
for (i = 0; i < nchips; i++) {
gc = irq_get_domain_generic_chip(domain, i * 32);
gc->reg_base = reg_base;
gc->unused = 0;
gc->wake_enabled = ~0;
gc->chip_types[0].type = IRQ_TYPE_SENSE_MASK;
gc->chip_types[0].chip.irq_eoi = irq_gc_eoi;
gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
gc->chip_types[0].chip.irq_shutdown = aic_common_shutdown;
gc->private = &aic[i];
}
aic_common_ext_irq_of_init(domain);
aic_common_irq_fixup(matches);
return domain;
err_domain_remove:
irq_domain_remove(domain);
err_free_aic:
kfree(aic);
err_iounmap:
iounmap(reg_base);
return ERR_PTR(ret);
}
