linux/drivers/irqchip/irq-clps711x.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
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>
2019-05-30 11:26:32 -07:00

235 lines
6.0 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* CLPS711X IRQ driver
*
* Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
*/
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <asm/exception.h>
#include <asm/mach/irq.h>
#define CLPS711X_INTSR1 (0x0240)
#define CLPS711X_INTMR1 (0x0280)
#define CLPS711X_BLEOI (0x0600)
#define CLPS711X_MCEOI (0x0640)
#define CLPS711X_TEOI (0x0680)
#define CLPS711X_TC1EOI (0x06c0)
#define CLPS711X_TC2EOI (0x0700)
#define CLPS711X_RTCEOI (0x0740)
#define CLPS711X_UMSEOI (0x0780)
#define CLPS711X_COEOI (0x07c0)
#define CLPS711X_INTSR2 (0x1240)
#define CLPS711X_INTMR2 (0x1280)
#define CLPS711X_SRXEOF (0x1600)
#define CLPS711X_KBDEOI (0x1700)
#define CLPS711X_INTSR3 (0x2240)
#define CLPS711X_INTMR3 (0x2280)
static const struct {
#define CLPS711X_FLAG_EN (1 << 0)
#define CLPS711X_FLAG_FIQ (1 << 1)
unsigned int flags;
phys_addr_t eoi;
} clps711x_irqs[] = {
[1] = { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, },
[3] = { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, },
[4] = { CLPS711X_FLAG_EN, CLPS711X_COEOI, },
[5] = { CLPS711X_FLAG_EN, },
[6] = { CLPS711X_FLAG_EN, },
[7] = { CLPS711X_FLAG_EN, },
[8] = { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, },
[9] = { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, },
[10] = { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, },
[11] = { CLPS711X_FLAG_EN, CLPS711X_TEOI, },
[12] = { CLPS711X_FLAG_EN, },
[13] = { CLPS711X_FLAG_EN, },
[14] = { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, },
[15] = { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, },
[16] = { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, },
[17] = { CLPS711X_FLAG_EN, },
[18] = { CLPS711X_FLAG_EN, },
[28] = { CLPS711X_FLAG_EN, },
[29] = { CLPS711X_FLAG_EN, },
[32] = { CLPS711X_FLAG_FIQ, },
};
static struct {
void __iomem *base;
void __iomem *intmr[3];
void __iomem *intsr[3];
struct irq_domain *domain;
struct irq_domain_ops ops;
} *clps711x_intc;
static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs)
{
u32 irqstat;
do {
irqstat = readw_relaxed(clps711x_intc->intmr[0]) &
readw_relaxed(clps711x_intc->intsr[0]);
if (irqstat)
handle_domain_irq(clps711x_intc->domain,
fls(irqstat) - 1, regs);
irqstat = readw_relaxed(clps711x_intc->intmr[1]) &
readw_relaxed(clps711x_intc->intsr[1]);
if (irqstat)
handle_domain_irq(clps711x_intc->domain,
fls(irqstat) - 1 + 16, regs);
} while (irqstat);
}
static void clps711x_intc_eoi(struct irq_data *d)
{
irq_hw_number_t hwirq = irqd_to_hwirq(d);
writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi);
}
static void clps711x_intc_mask(struct irq_data *d)
{
irq_hw_number_t hwirq = irqd_to_hwirq(d);
void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
u32 tmp;
tmp = readl_relaxed(intmr);
tmp &= ~(1 << (hwirq % 16));
writel_relaxed(tmp, intmr);
}
static void clps711x_intc_unmask(struct irq_data *d)
{
irq_hw_number_t hwirq = irqd_to_hwirq(d);
void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
u32 tmp;
tmp = readl_relaxed(intmr);
tmp |= 1 << (hwirq % 16);
writel_relaxed(tmp, intmr);
}
static struct irq_chip clps711x_intc_chip = {
.name = "clps711x-intc",
.irq_eoi = clps711x_intc_eoi,
.irq_mask = clps711x_intc_mask,
.irq_unmask = clps711x_intc_unmask,
};
static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
irq_flow_handler_t handler = handle_level_irq;
unsigned int flags = 0;
if (!clps711x_irqs[hw].flags)
return 0;
if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) {
handler = handle_bad_irq;
flags |= IRQ_NOAUTOEN;
} else if (clps711x_irqs[hw].eoi) {
handler = handle_fasteoi_irq;
}
/* Clear down pending interrupt */
if (clps711x_irqs[hw].eoi)
writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi);
irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler);
irq_modify_status(virq, IRQ_NOPROBE, flags);
return 0;
}
static int __init _clps711x_intc_init(struct device_node *np,
phys_addr_t base, resource_size_t size)
{
int err;
clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL);
if (!clps711x_intc)
return -ENOMEM;
clps711x_intc->base = ioremap(base, size);
if (!clps711x_intc->base) {
err = -ENOMEM;
goto out_kfree;
}
clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1;
clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1;
clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2;
clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2;
clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3;
clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3;
/* Mask all interrupts */
writel_relaxed(0, clps711x_intc->intmr[0]);
writel_relaxed(0, clps711x_intc->intmr[1]);
writel_relaxed(0, clps711x_intc->intmr[2]);
err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id());
if (err < 0)
goto out_iounmap;
clps711x_intc->ops.map = clps711x_intc_irq_map;
clps711x_intc->ops.xlate = irq_domain_xlate_onecell;
clps711x_intc->domain =
irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs),
0, 0, &clps711x_intc->ops, NULL);
if (!clps711x_intc->domain) {
err = -ENOMEM;
goto out_irqfree;
}
irq_set_default_host(clps711x_intc->domain);
set_handle_irq(clps711x_irqh);
#ifdef CONFIG_FIQ
init_FIQ(0);
#endif
return 0;
out_irqfree:
irq_free_descs(0, ARRAY_SIZE(clps711x_irqs));
out_iounmap:
iounmap(clps711x_intc->base);
out_kfree:
kfree(clps711x_intc);
return err;
}
void __init clps711x_intc_init(phys_addr_t base, resource_size_t size)
{
BUG_ON(_clps711x_intc_init(NULL, base, size));
}
#ifdef CONFIG_IRQCHIP
static int __init clps711x_intc_init_dt(struct device_node *np,
struct device_node *parent)
{
struct resource res;
int err;
err = of_address_to_resource(np, 0, &res);
if (err)
return err;
return _clps711x_intc_init(np, res.start, resource_size(&res));
}
IRQCHIP_DECLARE(clps711x, "cirrus,ep7209-intc", clps711x_intc_init_dt);
#endif