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/*
* Conexant Digicolor SoCs IRQ chip driver
*
* Author: Baruch Siach <baruch@tkos.co.il>
*
* Copyright (C) 2014 Paradox Innovation Ltd.
*
* 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/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <asm/exception.h>
#define UC_IRQ_CONTROL 0x04
#define IC_FLAG_CLEAR_LO 0x00
#define IC_FLAG_CLEAR_XLO 0x04
#define IC_INT0ENABLE_LO 0x10
#define IC_INT0ENABLE_XLO 0x14
#define IC_INT0STATUS_LO 0x18
#define IC_INT0STATUS_XLO 0x1c
static struct irq_domain *digicolor_irq_domain;
static void __exception_irq_entry digicolor_handle_irq(struct pt_regs *regs)
{
struct irq_domain_chip_generic *dgc = digicolor_irq_domain->gc;
struct irq_chip_generic *gc = dgc->gc[0];
u32 status, hwirq;
do {
status = irq_reg_readl(gc, IC_INT0STATUS_LO);
if (status) {
hwirq = ffs(status) - 1;
} else {
status = irq_reg_readl(gc, IC_INT0STATUS_XLO);
if (status)
hwirq = ffs(status) - 1 + 32;
else
return;
}
generic_handle_domain_irq(digicolor_irq_domain, hwirq);
} while (1);
}
static void __init digicolor_set_gc(void __iomem *reg_base, unsigned irq_base,
unsigned en_reg, unsigned ack_reg)
{
struct irq_chip_generic *gc;
gc = irq_get_domain_generic_chip(digicolor_irq_domain, irq_base);
gc->reg_base = reg_base;
gc->chip_types[0].regs.ack = ack_reg;
gc->chip_types[0].regs.mask = en_reg;
gc->chip_types[0].chip.irq_ack = 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;
}
static int __init digicolor_of_init(struct device_node *node,
struct device_node *parent)
{
void __iomem *reg_base;
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
struct regmap *ucregs;
int ret;
reg_base = of_iomap(node, 0);
if (!reg_base) {
pr_err("%pOF: unable to map IC registers\n", node);
return -ENXIO;
}
/* disable all interrupts */
writel(0, reg_base + IC_INT0ENABLE_LO);
writel(0, reg_base + IC_INT0ENABLE_XLO);
ucregs = syscon_regmap_lookup_by_phandle(node, "syscon");
if (IS_ERR(ucregs)) {
pr_err("%pOF: unable to map UC registers\n", node);
return PTR_ERR(ucregs);
}
/* channel 1, regular IRQs */
regmap_write(ucregs, UC_IRQ_CONTROL, 1);
digicolor_irq_domain =
irq_domain_add_linear(node, 64, &irq_generic_chip_ops, NULL);
if (!digicolor_irq_domain) {
pr_err("%pOF: unable to create IRQ domain\n", node);
return -ENOMEM;
}
ret = irq_alloc_domain_generic_chips(digicolor_irq_domain, 32, 1,
"digicolor_irq", handle_level_irq,
clr, 0, 0);
if (ret) {
pr_err("%pOF: unable to allocate IRQ gc\n", node);
return ret;
}
digicolor_set_gc(reg_base, 0, IC_INT0ENABLE_LO, IC_FLAG_CLEAR_LO);
digicolor_set_gc(reg_base, 32, IC_INT0ENABLE_XLO, IC_FLAG_CLEAR_XLO);
set_handle_irq(digicolor_handle_irq);
return 0;
}
IRQCHIP_DECLARE(conexant_digicolor_ic, "cnxt,cx92755-ic", digicolor_of_init);
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