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