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ARM: 6414/1: ux500: DB5500 generic modem IRQ handler

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This is a (threaded) IRQ handler for the modems that appear from the
modem part of the DB5500 ASIC.

Signed-off-by: Stefan Nilsson XK <stefan.xk.nilsson@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij 2010-09-27 22:10:55 +01:00 committed by Russell King
parent 4d4a4b037c
commit b84ccd776f
1 changed files with 139 additions and 0 deletions
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139
arch/arm/mach-ux500/modem_irq.c Normal file
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/*
* Copyright (C) ST-Ericsson SA 2010
* Author: Stefan Nilsson <stefan.xk.nilsson@stericsson.com> for ST-Ericsson.
* Author: Martin Persson <martin.persson@stericsson.com> for ST-Ericsson.
* License terms: GNU General Public License (GPL), version 2.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>
#define MODEM_INTCON_BASE_ADDR 0xBFFD3000
#define MODEM_INTCON_SIZE 0xFFF
#define DEST_IRQ41_OFFSET 0x2A4
#define DEST_IRQ43_OFFSET 0x2AC
#define DEST_IRQ45_OFFSET 0x2B4
#define PRIO_IRQ41_OFFSET 0x6A4
#define PRIO_IRQ43_OFFSET 0x6AC
#define PRIO_IRQ45_OFFSET 0x6B4
#define ALLOW_IRQ_OFFSET 0x104
#define MODEM_INTCON_CPU_NBR 0x1
#define MODEM_INTCON_PRIO_HIGH 0x0
#define MODEM_INTCON_ALLOW_IRQ41 0x0200
#define MODEM_INTCON_ALLOW_IRQ43 0x0800
#define MODEM_INTCON_ALLOW_IRQ45 0x2000
#define MODEM_IRQ_REG_OFFSET 0x4
struct modem_irq {
void __iomem *modem_intcon_base;
};
static void setup_modem_intcon(void __iomem *modem_intcon_base)
{
/* IC_DESTINATION_BASE_ARRAY - Which CPU to receive the IRQ */
writel(MODEM_INTCON_CPU_NBR, modem_intcon_base + DEST_IRQ41_OFFSET);
writel(MODEM_INTCON_CPU_NBR, modem_intcon_base + DEST_IRQ43_OFFSET);
writel(MODEM_INTCON_CPU_NBR, modem_intcon_base + DEST_IRQ45_OFFSET);
/* IC_PRIORITY_BASE_ARRAY - IRQ priority in modem IRQ controller */
writel(MODEM_INTCON_PRIO_HIGH, modem_intcon_base + PRIO_IRQ41_OFFSET);
writel(MODEM_INTCON_PRIO_HIGH, modem_intcon_base + PRIO_IRQ43_OFFSET);
writel(MODEM_INTCON_PRIO_HIGH, modem_intcon_base + PRIO_IRQ45_OFFSET);
/* IC_ALLOW_ARRAY - IRQ enable */
writel(MODEM_INTCON_ALLOW_IRQ41 |
MODEM_INTCON_ALLOW_IRQ43 |
MODEM_INTCON_ALLOW_IRQ45,
modem_intcon_base + ALLOW_IRQ_OFFSET);
}
static irqreturn_t modem_cpu_irq_handler(int irq, void *data)
{
int real_irq;
int virt_irq;
struct modem_irq *mi = (struct modem_irq *)data;
/* Read modem side IRQ number from modem IRQ controller */
real_irq = readl(mi->modem_intcon_base + MODEM_IRQ_REG_OFFSET) & 0xFF;
virt_irq = IRQ_MODEM_EVENTS_BASE + real_irq;
pr_debug("modem_irq: Worker read addr 0x%X and got value 0x%X "
"which will be 0x%X (%d) which translates to "
"virtual IRQ 0x%X (%d)!\n",
(u32)mi->modem_intcon_base + MODEM_IRQ_REG_OFFSET,
real_irq,
real_irq & 0xFF,
real_irq & 0xFF,
virt_irq,
virt_irq);
if (virt_irq != 0)
generic_handle_irq(virt_irq);
pr_debug("modem_irq: Done handling virtual IRQ %d!\n", virt_irq);
return IRQ_HANDLED;
}
static void create_virtual_irq(int irq, struct irq_chip *modem_irq_chip)
{
set_irq_chip(irq, modem_irq_chip);
set_irq_handler(irq, handle_simple_irq);
set_irq_flags(irq, IRQF_VALID);
pr_debug("modem_irq: Created virtual IRQ %d\n", irq);
}
static int modem_irq_init(void)
{
int err;
static struct irq_chip modem_irq_chip;
struct modem_irq *mi;
pr_info("modem_irq: Set up IRQ handler for incoming modem IRQ %d\n",
IRQ_DB5500_MODEM);
mi = kmalloc(sizeof(struct modem_irq), GFP_KERNEL);
if (!mi) {
pr_err("modem_irq: Could not allocate device\n");
return -ENOMEM;
}
mi->modem_intcon_base =
ioremap(MODEM_INTCON_BASE_ADDR, MODEM_INTCON_SIZE);
pr_debug("modem_irq: ioremapped modem_intcon_base from "
"phy 0x%x to virt 0x%x\n", MODEM_INTCON_BASE_ADDR,
(u32)mi->modem_intcon_base);
setup_modem_intcon(mi->modem_intcon_base);
modem_irq_chip = dummy_irq_chip;
modem_irq_chip.name = "modem_irq";
/* Create the virtual IRQ:s needed */
create_virtual_irq(MBOX_PAIR0_VIRT_IRQ, &modem_irq_chip);
create_virtual_irq(MBOX_PAIR1_VIRT_IRQ, &modem_irq_chip);
create_virtual_irq(MBOX_PAIR2_VIRT_IRQ, &modem_irq_chip);
err = request_threaded_irq(IRQ_DB5500_MODEM, NULL,
modem_cpu_irq_handler, IRQF_ONESHOT,
"modem_irq", mi);
if (err)
pr_err("modem_irq: Could not register IRQ %d\n",
IRQ_DB5500_MODEM);
return 0;
}
arch_initcall(modem_irq_init);