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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); |
140 |
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