tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * arch/sh/boards/superh/microdev/irq.c
3 *
4 * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
5 *
6 * SuperH SH4-202 MicroDev board support.
7 *
8 * May be copied or modified under the terms of the GNU General Public
9 * License. See linux/COPYING for more information.
10 */
11
12#include <linux/init.h>
13#include <linux/irq.h>
14#include <linux/interrupt.h>
15#include <asm/system.h>
16#include <asm/io.h>
17#include <mach/microdev.h>
18
19#define NUM_EXTERNAL_IRQS 16 /* IRL0 .. IRL15 */
20
21static const struct {
22 unsigned char fpgaIrq;
23 unsigned char mapped;
24 const char *name;
25} fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
26 { 0, 0, "unused" }, /* IRQ #0 IRL=15 0x200 */
27 { MICRODEV_FPGA_IRQ_KEYBOARD, 1, "keyboard" }, /* IRQ #1 IRL=14 0x220 */
28 { MICRODEV_FPGA_IRQ_SERIAL1, 1, "Serial #1"}, /* IRQ #2 IRL=13 0x240 */
29 { MICRODEV_FPGA_IRQ_ETHERNET, 1, "Ethernet" }, /* IRQ #3 IRL=12 0x260 */
30 { MICRODEV_FPGA_IRQ_SERIAL2, 0, "Serial #2"}, /* IRQ #4 IRL=11 0x280 */
31 { 0, 0, "unused" }, /* IRQ #5 IRL=10 0x2a0 */
32 { 0, 0, "unused" }, /* IRQ #6 IRL=9 0x2c0 */
33 { MICRODEV_FPGA_IRQ_USB_HC, 1, "USB" }, /* IRQ #7 IRL=8 0x2e0 */
34 { MICRODEV_IRQ_PCI_INTA, 1, "PCI INTA" }, /* IRQ #8 IRL=7 0x300 */
35 { MICRODEV_IRQ_PCI_INTB, 1, "PCI INTB" }, /* IRQ #9 IRL=6 0x320 */
36 { MICRODEV_IRQ_PCI_INTC, 1, "PCI INTC" }, /* IRQ #10 IRL=5 0x340 */
37 { MICRODEV_IRQ_PCI_INTD, 1, "PCI INTD" }, /* IRQ #11 IRL=4 0x360 */
38 { MICRODEV_FPGA_IRQ_MOUSE, 1, "mouse" }, /* IRQ #12 IRL=3 0x380 */
39 { MICRODEV_FPGA_IRQ_IDE2, 1, "IDE #2" }, /* IRQ #13 IRL=2 0x3a0 */
40 { MICRODEV_FPGA_IRQ_IDE1, 1, "IDE #1" }, /* IRQ #14 IRL=1 0x3c0 */
41 { 0, 0, "unused" }, /* IRQ #15 IRL=0 0x3e0 */
42};
43
44#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
45# error Inconsistancy in defining the IRQ# for Keyboard!
46#endif
47
48#if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
49# error Inconsistancy in defining the IRQ# for Ethernet!
50#endif
51
52#if (MICRODEV_LINUX_IRQ_USB_HC != 7)
53# error Inconsistancy in defining the IRQ# for USB!
54#endif
55
56#if (MICRODEV_LINUX_IRQ_MOUSE != 12)
57# error Inconsistancy in defining the IRQ# for PS/2 Mouse!
58#endif
59
60#if (MICRODEV_LINUX_IRQ_IDE2 != 13)
61# error Inconsistancy in defining the IRQ# for secondary IDE!
62#endif
63
64#if (MICRODEV_LINUX_IRQ_IDE1 != 14)
65# error Inconsistancy in defining the IRQ# for primary IDE!
66#endif
67
68static void disable_microdev_irq(struct irq_data *data)
69{
70 unsigned int irq = data->irq;
71 unsigned int fpgaIrq;
72
73 if (irq >= NUM_EXTERNAL_IRQS)
74 return;
75 if (!fpgaIrqTable[irq].mapped)
76 return;
77
78 fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
79
80 /* disable interrupts on the FPGA INTC register */
81 __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
82}
83
84static void enable_microdev_irq(struct irq_data *data)
85{
86 unsigned int irq = data->irq;
87 unsigned long priorityReg, priorities, pri;
88 unsigned int fpgaIrq;
89
90 if (unlikely(irq >= NUM_EXTERNAL_IRQS))
91 return;
92 if (unlikely(!fpgaIrqTable[irq].mapped))
93 return;
94
95 pri = 15 - irq;
96
97 fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
98 priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
99
100 /* set priority for the interrupt */
101 priorities = __raw_readl(priorityReg);
102 priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
103 priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
104 __raw_writel(priorities, priorityReg);
105
106 /* enable interrupts on the FPGA INTC register */
107 __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
108}
109
110static struct irq_chip microdev_irq_type = {
111 .name = "MicroDev-IRQ",
112 .irq_unmask = enable_microdev_irq,
113 .irq_mask = disable_microdev_irq,
114};
115
116/* This function sets the desired irq handler to be a MicroDev type */
117static void __init make_microdev_irq(unsigned int irq)
118{
119 disable_irq_nosync(irq);
120 irq_set_chip_and_handler(irq, µdev_irq_type, handle_level_irq);
121 disable_microdev_irq(irq_get_irq_data(irq));
122}
123
124extern void __init init_microdev_irq(void)
125{
126 int i;
127
128 /* disable interrupts on the FPGA INTC register */
129 __raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);
130
131 for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
132 make_microdev_irq(i);
133}
134
135extern void microdev_print_fpga_intc_status(void)
136{
137 volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
138 volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
139 volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
140 volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
141 volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
142 volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
143 volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
144 volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
145
146 printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
147 printk("FPGA_INTENB = 0x%08x\n", *intenb);
148 printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
149 printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
150 printk("FPGA_INTREQ = 0x%08x\n", *intreq);
151 printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
152 printk("-------------------------------------------------------------------------------\n");
153}