| Linus Walleij | b84ccd7 | 2010-09-27 22:10:55 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson SA 2010 |
| 3 | * Author: Stefan Nilsson <stefan.xk.nilsson@stericsson.com> for ST-Ericsson. |
| 4 | * Author: Martin Persson <martin.persson@stericsson.com> for ST-Ericsson. |
| 5 | * License terms: GNU General Public License (GPL), version 2. |
| 6 | */ |
| 7 | |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/irq.h> |
| 11 | #include <linux/interrupt.h> |
| 12 | #include <linux/io.h> |
| 13 | #include <linux/slab.h> |
| 14 | |
| 15 | #define MODEM_INTCON_BASE_ADDR 0xBFFD3000 |
| 16 | #define MODEM_INTCON_SIZE 0xFFF |
| 17 | |
| 18 | #define DEST_IRQ41_OFFSET 0x2A4 |
| 19 | #define DEST_IRQ43_OFFSET 0x2AC |
| 20 | #define DEST_IRQ45_OFFSET 0x2B4 |
| 21 | |
| 22 | #define PRIO_IRQ41_OFFSET 0x6A4 |
| 23 | #define PRIO_IRQ43_OFFSET 0x6AC |
| 24 | #define PRIO_IRQ45_OFFSET 0x6B4 |
| 25 | |
| 26 | #define ALLOW_IRQ_OFFSET 0x104 |
| 27 | |
| 28 | #define MODEM_INTCON_CPU_NBR 0x1 |
| 29 | #define MODEM_INTCON_PRIO_HIGH 0x0 |
| 30 | |
| 31 | #define MODEM_INTCON_ALLOW_IRQ41 0x0200 |
| 32 | #define MODEM_INTCON_ALLOW_IRQ43 0x0800 |
| 33 | #define MODEM_INTCON_ALLOW_IRQ45 0x2000 |
| 34 | |
| 35 | #define MODEM_IRQ_REG_OFFSET 0x4 |
| 36 | |
| 37 | struct modem_irq { |
| 38 | void __iomem *modem_intcon_base; |
| 39 | }; |
| 40 | |
| 41 | |
| 42 | static void setup_modem_intcon(void __iomem *modem_intcon_base) |
| 43 | { |
| 44 | /* IC_DESTINATION_BASE_ARRAY - Which CPU to receive the IRQ */ |
| 45 | writel(MODEM_INTCON_CPU_NBR, modem_intcon_base + DEST_IRQ41_OFFSET); |
| 46 | writel(MODEM_INTCON_CPU_NBR, modem_intcon_base + DEST_IRQ43_OFFSET); |
| 47 | writel(MODEM_INTCON_CPU_NBR, modem_intcon_base + DEST_IRQ45_OFFSET); |
| 48 | |
| 49 | /* IC_PRIORITY_BASE_ARRAY - IRQ priority in modem IRQ controller */ |
| 50 | writel(MODEM_INTCON_PRIO_HIGH, modem_intcon_base + PRIO_IRQ41_OFFSET); |
| 51 | writel(MODEM_INTCON_PRIO_HIGH, modem_intcon_base + PRIO_IRQ43_OFFSET); |
| 52 | writel(MODEM_INTCON_PRIO_HIGH, modem_intcon_base + PRIO_IRQ45_OFFSET); |
| 53 | |
| 54 | /* IC_ALLOW_ARRAY - IRQ enable */ |
| 55 | writel(MODEM_INTCON_ALLOW_IRQ41 | |
| 56 | MODEM_INTCON_ALLOW_IRQ43 | |
| 57 | MODEM_INTCON_ALLOW_IRQ45, |
| 58 | modem_intcon_base + ALLOW_IRQ_OFFSET); |
| 59 | } |
| 60 | |
| 61 | static irqreturn_t modem_cpu_irq_handler(int irq, void *data) |
| 62 | { |
| 63 | int real_irq; |
| 64 | int virt_irq; |
| 65 | struct modem_irq *mi = (struct modem_irq *)data; |
| 66 | |
| 67 | /* Read modem side IRQ number from modem IRQ controller */ |
| 68 | real_irq = readl(mi->modem_intcon_base + MODEM_IRQ_REG_OFFSET) & 0xFF; |
| 69 | virt_irq = IRQ_MODEM_EVENTS_BASE + real_irq; |
| 70 | |
| 71 | pr_debug("modem_irq: Worker read addr 0x%X and got value 0x%X " |
| 72 | "which will be 0x%X (%d) which translates to " |
| 73 | "virtual IRQ 0x%X (%d)!\n", |
| 74 | (u32)mi->modem_intcon_base + MODEM_IRQ_REG_OFFSET, |
| 75 | real_irq, |
| 76 | real_irq & 0xFF, |
| 77 | real_irq & 0xFF, |
| 78 | virt_irq, |
| 79 | virt_irq); |
| 80 | |
| 81 | if (virt_irq != 0) |
| 82 | generic_handle_irq(virt_irq); |
| 83 | |
| 84 | pr_debug("modem_irq: Done handling virtual IRQ %d!\n", virt_irq); |
| 85 | |
| 86 | return IRQ_HANDLED; |
| 87 | } |
| 88 | |
| 89 | static void create_virtual_irq(int irq, struct irq_chip *modem_irq_chip) |
| 90 | { |
| 91 | set_irq_chip(irq, modem_irq_chip); |
| 92 | set_irq_handler(irq, handle_simple_irq); |
| 93 | set_irq_flags(irq, IRQF_VALID); |
| 94 | |
| 95 | pr_debug("modem_irq: Created virtual IRQ %d\n", irq); |
| 96 | } |
| 97 | |
| 98 | static int modem_irq_init(void) |
| 99 | { |
| 100 | int err; |
| 101 | static struct irq_chip modem_irq_chip; |
| 102 | struct modem_irq *mi; |
| 103 | |
| 104 | pr_info("modem_irq: Set up IRQ handler for incoming modem IRQ %d\n", |
| 105 | IRQ_DB5500_MODEM); |
| 106 | |
| 107 | mi = kmalloc(sizeof(struct modem_irq), GFP_KERNEL); |
| 108 | if (!mi) { |
| 109 | pr_err("modem_irq: Could not allocate device\n"); |
| 110 | return -ENOMEM; |
| 111 | } |
| 112 | |
| 113 | mi->modem_intcon_base = |
| 114 | ioremap(MODEM_INTCON_BASE_ADDR, MODEM_INTCON_SIZE); |
| 115 | pr_debug("modem_irq: ioremapped modem_intcon_base from " |
| 116 | "phy 0x%x to virt 0x%x\n", MODEM_INTCON_BASE_ADDR, |
| 117 | (u32)mi->modem_intcon_base); |
| 118 | |
| 119 | setup_modem_intcon(mi->modem_intcon_base); |
| 120 | |
| 121 | modem_irq_chip = dummy_irq_chip; |
| 122 | modem_irq_chip.name = "modem_irq"; |
| 123 | |
| 124 | /* Create the virtual IRQ:s needed */ |
| 125 | create_virtual_irq(MBOX_PAIR0_VIRT_IRQ, &modem_irq_chip); |
| 126 | create_virtual_irq(MBOX_PAIR1_VIRT_IRQ, &modem_irq_chip); |
| 127 | create_virtual_irq(MBOX_PAIR2_VIRT_IRQ, &modem_irq_chip); |
| 128 | |
| 129 | err = request_threaded_irq(IRQ_DB5500_MODEM, NULL, |
| 130 | modem_cpu_irq_handler, IRQF_ONESHOT, |
| 131 | "modem_irq", mi); |
| 132 | if (err) |
| 133 | pr_err("modem_irq: Could not register IRQ %d\n", |
| 134 | IRQ_DB5500_MODEM); |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | arch_initcall(modem_irq_init); |