1 /* arch/arm/mach-lh7a40x/irq-lpd7a40x.c
3 * Copyright (C) 2004 Coastal Environmental Systems
4 * Copyright (C) 2004 Logic Product Development
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/ptrace.h>
17 #include <asm/hardware.h>
19 #include <asm/mach/irq.h>
20 #include <asm/arch/irqs.h>
24 static void lh7a40x_ack_cpld_irq (u32 irq)
26 /* CPLD doesn't have ack capability */
29 static void lh7a40x_mask_cpld_irq (u32 irq)
32 case IRQ_LPD7A40X_ETH_INT:
33 CPLD_INTERRUPTS = CPLD_INTERRUPTS | 0x4;
36 CPLD_INTERRUPTS = CPLD_INTERRUPTS | 0x8;
41 static void lh7a40x_unmask_cpld_irq (u32 irq)
44 case IRQ_LPD7A40X_ETH_INT:
45 CPLD_INTERRUPTS = CPLD_INTERRUPTS & ~ 0x4;
48 CPLD_INTERRUPTS = CPLD_INTERRUPTS & ~ 0x8;
53 static struct irq_chip lh7a40x_cpld_chip = {
55 .ack = lh7a40x_ack_cpld_irq,
56 .mask = lh7a40x_mask_cpld_irq,
57 .unmask = lh7a40x_unmask_cpld_irq,
60 static void lh7a40x_cpld_handler (unsigned int irq, struct irqdesc *desc)
62 unsigned int mask = CPLD_INTERRUPTS;
64 desc->chip->ack (irq);
66 if ((mask & 0x1) == 0) /* WLAN */
67 IRQ_DISPATCH (IRQ_LPD7A40X_ETH_INT);
69 if ((mask & 0x2) == 0) /* Touch */
70 IRQ_DISPATCH (IRQ_LPD7A400_TS);
72 desc->chip->unmask (irq); /* Level-triggered need this */
76 /* IRQ initialization */
78 void __init lh7a40x_init_board_irq (void)
82 /* Rev A (v2.8): PF0, PF1, PF2, and PF3 are available IRQs.
83 PF7 supports the CPLD.
84 Rev B (v3.4): PF0, PF1, and PF2 are available IRQs.
85 PF3 supports the CPLD.
86 (Some) LPD7A404 prerelease boards report a version
87 number of 0x16, but we force an override since the
88 hardware is of the newer variety.
91 unsigned char cpld_version = CPLD_REVISION;
94 #if defined CONFIG_MACH_LPD7A404
95 cpld_version = 0x34; /* Override, for now */
97 pinCPLD = (cpld_version == 0x28) ? 7 : 3;
99 /* First, configure user controlled GPIOF interrupts */
101 GPIO_PFDD &= ~0x0f; /* PF0-3 are inputs */
102 GPIO_INTTYPE1 &= ~0x0f; /* PF0-3 are level triggered */
103 GPIO_INTTYPE2 &= ~0x0f; /* PF0-3 are active low */
105 GPIO_GPIOFINTEN |= 0x0f; /* Enable PF0, PF1, PF2, and PF3 IRQs */
107 /* Then, configure CPLD interrupt */
109 CPLD_INTERRUPTS = 0x0c; /* Disable all CPLD interrupts */
110 GPIO_PFDD &= ~(1 << pinCPLD); /* Make input */
111 GPIO_INTTYPE1 |= (1 << pinCPLD); /* Edge triggered */
112 GPIO_INTTYPE2 &= ~(1 << pinCPLD); /* Active low */
114 GPIO_GPIOFINTEN |= (1 << pinCPLD); /* Enable */
116 /* Cascade CPLD interrupts */
118 for (irq = IRQ_BOARD_START;
119 irq < IRQ_BOARD_START + NR_IRQ_BOARD; ++irq) {
120 set_irq_chip (irq, &lh7a40x_cpld_chip);
121 set_irq_handler (irq, do_edge_IRQ);
122 set_irq_flags (irq, IRQF_VALID);
125 set_irq_chained_handler ((cpld_version == 0x28)
128 lh7a40x_cpld_handler);