2 * arch/sh/kernel/cpu/irq/intc-sh5.c
4 * Interrupt Controller support for SH5 INTC.
6 * Copyright (C) 2000, 2001 Paolo Alberelli
7 * Copyright (C) 2003 Paul Mundt
9 * Per-interrupt selective. IRLM=0 (Fixed priority) is not
10 * supported being useless without a cascaded interrupt
13 * This file is subject to the terms and conditions of the GNU General Public
14 * License. See the file "COPYING" in the main directory of this archive
17 #include <linux/init.h>
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
21 #include <linux/kernel.h>
22 #include <linux/bitops.h>
27 * Maybe the generic Peripheral block could move to a more
28 * generic include file. INTC Block will be defined here
29 * and only here to make INTC self-contained in a single
32 #define INTC_BLOCK_OFFSET 0x01000000
35 #define INTC_BASE PHYS_PERIPHERAL_BLOCK + \
39 #define INTC_ICR_SET (intc_virt + 0x0)
40 #define INTC_ICR_CLEAR (intc_virt + 0x8)
41 #define INTC_INTPRI_0 (intc_virt + 0x10)
42 #define INTC_INTSRC_0 (intc_virt + 0x50)
43 #define INTC_INTSRC_1 (intc_virt + 0x58)
44 #define INTC_INTREQ_0 (intc_virt + 0x60)
45 #define INTC_INTREQ_1 (intc_virt + 0x68)
46 #define INTC_INTENB_0 (intc_virt + 0x70)
47 #define INTC_INTENB_1 (intc_virt + 0x78)
48 #define INTC_INTDSB_0 (intc_virt + 0x80)
49 #define INTC_INTDSB_1 (intc_virt + 0x88)
51 #define INTC_ICR_IRLM 0x1
52 #define INTC_INTPRI_PREGS 8 /* 8 Priority Registers */
53 #define INTC_INTPRI_PPREG 8 /* 8 Priorities per Register */
57 * Mapper between the vector ordinal and the IRQ number
58 * passed to kernel/device drivers.
60 int intc_evt_to_irq[(0xE20/0x20)+1] = {
61 -1, -1, -1, -1, -1, -1, -1, -1, /* 0x000 - 0x0E0 */
62 -1, -1, -1, -1, -1, -1, -1, -1, /* 0x100 - 0x1E0 */
63 0, 0, 0, 0, 0, 1, 0, 0, /* 0x200 - 0x2E0 */
64 2, 0, 0, 3, 0, 0, 0, -1, /* 0x300 - 0x3E0 */
65 32, 33, 34, 35, 36, 37, 38, -1, /* 0x400 - 0x4E0 */
66 -1, -1, -1, 63, -1, -1, -1, -1, /* 0x500 - 0x5E0 */
67 -1, -1, 18, 19, 20, 21, 22, -1, /* 0x600 - 0x6E0 */
68 39, 40, 41, 42, -1, -1, -1, -1, /* 0x700 - 0x7E0 */
69 4, 5, 6, 7, -1, -1, -1, -1, /* 0x800 - 0x8E0 */
70 -1, -1, -1, -1, -1, -1, -1, -1, /* 0x900 - 0x9E0 */
71 12, 13, 14, 15, 16, 17, -1, -1, /* 0xA00 - 0xAE0 */
72 -1, -1, -1, -1, -1, -1, -1, -1, /* 0xB00 - 0xBE0 */
73 -1, -1, -1, -1, -1, -1, -1, -1, /* 0xC00 - 0xCE0 */
74 -1, -1, -1, -1, -1, -1, -1, -1, /* 0xD00 - 0xDE0 */
75 -1, -1 /* 0xE00 - 0xE20 */
78 static unsigned long intc_virt;
80 static unsigned int startup_intc_irq(unsigned int irq);
81 static void shutdown_intc_irq(unsigned int irq);
82 static void enable_intc_irq(unsigned int irq);
83 static void disable_intc_irq(unsigned int irq);
84 static void mask_and_ack_intc(unsigned int);
85 static void end_intc_irq(unsigned int irq);
87 static struct hw_interrupt_type intc_irq_type = {
89 .startup = startup_intc_irq,
90 .shutdown = shutdown_intc_irq,
91 .enable = enable_intc_irq,
92 .disable = disable_intc_irq,
93 .ack = mask_and_ack_intc,
97 static int irlm; /* IRL mode */
99 static unsigned int startup_intc_irq(unsigned int irq)
101 enable_intc_irq(irq);
102 return 0; /* never anything pending */
105 static void shutdown_intc_irq(unsigned int irq)
107 disable_intc_irq(irq);
110 static void enable_intc_irq(unsigned int irq)
113 unsigned long bitmask;
115 if ((irq <= IRQ_IRL3) && (irlm == NO_PRIORITY))
116 printk("Trying to use straight IRL0-3 with an encoding platform.\n");
123 bitmask = 1 << (irq - 32);
126 ctrl_outl(bitmask, reg);
129 static void disable_intc_irq(unsigned int irq)
132 unsigned long bitmask;
139 bitmask = 1 << (irq - 32);
142 ctrl_outl(bitmask, reg);
145 static void mask_and_ack_intc(unsigned int irq)
147 disable_intc_irq(irq);
150 static void end_intc_irq(unsigned int irq)
152 enable_intc_irq(irq);
155 /* For future use, if we ever support IRLM=0) */
156 void make_intc_irq(unsigned int irq)
158 disable_irq_nosync(irq);
159 irq_desc[irq].chip = &intc_irq_type;
160 disable_intc_irq(irq);
163 #if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL)
164 static int IRQ_to_vectorN[NR_INTC_IRQS] = {
165 0x12, 0x15, 0x18, 0x1B, 0x40, 0x41, 0x42, 0x43, /* 0- 7 */
166 -1, -1, -1, -1, 0x50, 0x51, 0x52, 0x53, /* 8-15 */
167 0x54, 0x55, 0x32, 0x33, 0x34, 0x35, 0x36, -1, /* 16-23 */
168 -1, -1, -1, -1, -1, -1, -1, -1, /* 24-31 */
169 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x38, /* 32-39 */
170 0x39, 0x3A, 0x3B, -1, -1, -1, -1, -1, /* 40-47 */
171 -1, -1, -1, -1, -1, -1, -1, -1, /* 48-55 */
172 -1, -1, -1, -1, -1, -1, -1, 0x2B, /* 56-63 */
176 int intc_irq_describe(char* p, int irq)
178 if (irq < NR_INTC_IRQS)
179 return sprintf(p, "(0x%3x)", IRQ_to_vectorN[irq]*0x20);
185 void __init plat_irq_setup(void)
187 unsigned long long __dummy0, __dummy1=~0x00000000100000f0;
191 intc_virt = onchip_remap(INTC_BASE, 1024, "INTC");
193 panic("Unable to remap INTC\n");
197 /* Set default: per-line enable/disable, priority driven ack/eoi */
198 for (i = 0; i < NR_INTC_IRQS; i++)
199 irq_desc[i].chip = &intc_irq_type;
202 /* Disable all interrupts and set all priorities to 0 to avoid trouble */
203 ctrl_outl(-1, INTC_INTDSB_0);
204 ctrl_outl(-1, INTC_INTDSB_1);
206 for (reg = INTC_INTPRI_0, i = 0; i < INTC_INTPRI_PREGS; i++, reg += 8)
207 ctrl_outl( NO_PRIORITY, reg);
210 #ifdef CONFIG_SH_CAYMAN
215 /* If all the priorities are set to 'no priority', then
216 * assume we are using encoded mode.
218 irlm = platform_int_priority[IRQ_IRL0] +
219 platform_int_priority[IRQ_IRL1] +
220 platform_int_priority[IRQ_IRL2] +
221 platform_int_priority[IRQ_IRL3];
222 if (irlm == NO_PRIORITY) {
224 reg = INTC_ICR_CLEAR;
226 printk("Trying to use encoded IRL0-3. IRLs unsupported.\n");
232 ctrl_outl(INTC_ICR_IRLM, reg);
234 /* Set interrupt priorities according to platform description */
235 for (data = 0, reg = INTC_INTPRI_0; i < NR_INTC_IRQS; i++) {
236 data |= platform_int_priority[i] <<
237 ((i % INTC_INTPRI_PPREG) * 4);
238 if ((i % INTC_INTPRI_PPREG) == (INTC_INTPRI_PPREG - 1)) {
239 /* Upon the 7th, set Priority Register */
240 ctrl_outl(data, reg);
249 * And now let interrupts come in.
250 * sti() is not enough, we need to
251 * lower priority, too.
253 __asm__ __volatile__("getcon " __SR ", %0\n\t"
255 "putcon %0, " __SR "\n\t"