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/*
* CLPS711X IRQ driver
*
* Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
*
* 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.
*/
#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 = IRQF_VALID | IRQF_PROBE;
if (!clps711x_irqs[hw].flags)
return 0;
if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) {
handler = handle_bad_irq;
flags |= IRQF_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);
set_irq_flags(virq, 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 (IS_ERR_VALUE(err))
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,clps711x-intc", clps711x_intc_init_dt);
#endif
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