mirror of https://gitee.com/openkylin/linux.git
144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/*
|
|
* 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>
|
|
|
|
#include <mach/id.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)
|
|
{
|
|
irq_set_chip_and_handler(irq, modem_irq_chip, 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;
|
|
|
|
if (!cpu_is_u5500())
|
|
return -ENODEV;
|
|
|
|
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);
|