2 * BRIEF MODULE DESCRIPTION
3 * ITE 8172G interrupt/setup routines.
5 * Copyright 2000,2001 MontaVista Software Inc.
6 * Author: MontaVista Software, Inc.
7 * ppopov@mvista.com or source@mvista.com
9 * Part of this file was derived from Carsten Langgaard's
10 * arch/mips/mips-boards/atlas/atlas_int.c.
12 * Carsten Langgaard, carstenl@mips.com
13 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
20 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
21 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
23 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
26 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
27 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 * You should have received a copy of the GNU General Public License along
32 * with this program; if not, write to the Free Software Foundation, Inc.,
33 * 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/errno.h>
36 #include <linux/init.h>
37 #include <linux/irq.h>
38 #include <linux/kernel_stat.h>
39 #include <linux/module.h>
40 #include <linux/signal.h>
41 #include <linux/sched.h>
42 #include <linux/types.h>
43 #include <linux/interrupt.h>
44 #include <linux/ioport.h>
45 #include <linux/timex.h>
46 #include <linux/slab.h>
47 #include <linux/random.h>
48 #include <linux/serial_reg.h>
49 #include <linux/bitops.h>
51 #include <asm/bootinfo.h>
53 #include <asm/mipsregs.h>
54 #include <asm/system.h>
55 #include <asm/it8172/it8172.h>
56 #include <asm/it8172/it8172_int.h>
57 #include <asm/it8172/it8172_dbg.h>
60 #define EXT_IRQ0_TO_IP 2 /* IP 2 */
61 #define EXT_IRQ5_TO_IP 7 /* IP 7 */
63 #define ALLINTS_NOTIMER (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4)
65 void disable_it8172_irq(unsigned int irq_nr);
66 void enable_it8172_irq(unsigned int irq_nr);
68 extern void set_debug_traps(void);
69 extern void mips_timer_interrupt(int irq, struct pt_regs *regs);
70 extern asmlinkage void it8172_IRQ(void);
72 struct it8172_intc_regs volatile *it8172_hw0_icregs =
73 (struct it8172_intc_regs volatile *)(KSEG1ADDR(IT8172_PCI_IO_BASE + IT_INTC_BASE));
75 static void disable_it8172_irq(unsigned int irq_nr)
77 if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
79 it8172_hw0_icregs->lpc_mask |=
80 (1 << (irq_nr - IT8172_LPC_IRQ_BASE));
81 } else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
82 /* Local Bus interrupt */
83 it8172_hw0_icregs->lb_mask |=
84 (1 << (irq_nr - IT8172_LB_IRQ_BASE));
85 } else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
86 /* PCI and other interrupts */
87 it8172_hw0_icregs->pci_mask |=
88 (1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
89 } else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
91 it8172_hw0_icregs->nmi_mask |=
92 (1 << (irq_nr - IT8172_NMI_IRQ_BASE));
94 panic("disable_it8172_irq: bad irq %d", irq_nr);
98 static void enable_it8172_irq(unsigned int irq_nr)
100 if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
102 it8172_hw0_icregs->lpc_mask &=
103 ~(1 << (irq_nr - IT8172_LPC_IRQ_BASE));
105 else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
106 /* Local Bus interrupt */
107 it8172_hw0_icregs->lb_mask &=
108 ~(1 << (irq_nr - IT8172_LB_IRQ_BASE));
110 else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
111 /* PCI and other interrupts */
112 it8172_hw0_icregs->pci_mask &=
113 ~(1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
115 else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
117 it8172_hw0_icregs->nmi_mask &=
118 ~(1 << (irq_nr - IT8172_NMI_IRQ_BASE));
121 panic("enable_it8172_irq: bad irq %d", irq_nr);
125 static unsigned int startup_ite_irq(unsigned int irq)
127 enable_it8172_irq(irq);
131 #define shutdown_ite_irq disable_it8172_irq
132 #define mask_and_ack_ite_irq disable_it8172_irq
134 static void end_ite_irq(unsigned int irq)
136 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
137 enable_it8172_irq(irq);
140 static struct hw_interrupt_type it8172_irq_type = {
141 .typename = "ITE8172",
142 .startup = startup_ite_irq,
143 .shutdown = shutdown_ite_irq,
144 .enable = enable_it8172_irq,
145 .disable = disable_it8172_irq,
146 .ack = mask_and_ack_ite_irq,
151 static void enable_none(unsigned int irq) { }
152 static unsigned int startup_none(unsigned int irq) { return 0; }
153 static void disable_none(unsigned int irq) { }
154 static void ack_none(unsigned int irq) { }
156 /* startup is the same as "enable", shutdown is same as "disable" */
157 #define shutdown_none disable_none
158 #define end_none enable_none
160 static struct hw_interrupt_type cp0_irq_type = {
161 .typename = "CP0 Count",
162 .startup = startup_none,
163 .shutdown = shutdown_none,
164 .enable = enable_none,
165 .disable = disable_none,
170 void enable_cpu_timer(void)
174 local_irq_save(flags);
175 set_c0_status(0x100 << EXT_IRQ5_TO_IP);
176 local_irq_restore(flags);
179 void __init arch_init_irq(void)
184 set_except_vector(0, it8172_IRQ);
186 /* mask all interrupts */
187 it8172_hw0_icregs->lb_mask = 0xffff;
188 it8172_hw0_icregs->lpc_mask = 0xffff;
189 it8172_hw0_icregs->pci_mask = 0xffff;
190 it8172_hw0_icregs->nmi_mask = 0xffff;
192 /* make all interrupts level triggered */
193 it8172_hw0_icregs->lb_trigger = 0;
194 it8172_hw0_icregs->lpc_trigger = 0;
195 it8172_hw0_icregs->pci_trigger = 0;
196 it8172_hw0_icregs->nmi_trigger = 0;
198 /* active level setting */
199 /* uart, keyboard, and mouse are active high */
200 it8172_hw0_icregs->lpc_level = (0x10 | 0x2 | 0x1000);
201 it8172_hw0_icregs->lb_level |= 0x20;
203 /* keyboard and mouse are edge triggered */
204 it8172_hw0_icregs->lpc_trigger |= (0x2 | 0x1000);
208 // Enable this piece of code to make internal USB interrupt
210 it8172_hw0_icregs->pci_trigger |=
211 (1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
212 it8172_hw0_icregs->pci_level &=
213 ~(1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
216 for (i = 0; i <= IT8172_LAST_IRQ; i++) {
217 irq_desc[i].handler = &it8172_irq_type;
218 spin_lock_init(&irq_desc[i].lock);
220 irq_desc[MIPS_CPU_TIMER_IRQ].handler = &cp0_irq_type;
221 set_c0_status(ALLINTS_NOTIMER);
224 void mips_spurious_interrupt(struct pt_regs *regs)
229 unsigned long status, cause;
231 printk("got spurious interrupt\n");
232 status = read_c0_status();
233 cause = read_c0_cause();
234 printk("status %x cause %x\n", status, cause);
235 printk("epc %x badvaddr %x \n", regs->cp0_epc, regs->cp0_badvaddr);
239 void it8172_hw0_irqdispatch(struct pt_regs *regs)
242 unsigned short intstatus = 0, status = 0;
244 intstatus = it8172_hw0_icregs->intstatus;
245 if (intstatus & 0x8) {
246 panic("Got NMI interrupt");
247 } else if (intstatus & 0x4) {
250 status |= it8172_hw0_icregs->pci_req;
251 while (!(status & 0x1)) {
255 irq += IT8172_PCI_DEV_IRQ_BASE;
256 } else if (intstatus & 0x1) {
257 /* Local Bus interrupt */
259 status |= it8172_hw0_icregs->lb_req;
260 while (!(status & 0x1)) {
264 irq += IT8172_LB_IRQ_BASE;
265 } else if (intstatus & 0x2) {
267 /* Since some lpc interrupts are edge triggered,
268 * we could lose an interrupt this way because
269 * we acknowledge all ints at onces. Revisit.
271 status |= it8172_hw0_icregs->lpc_req;
272 it8172_hw0_icregs->lpc_req = 0; /* acknowledge ints */
274 while (!(status & 0x1)) {
278 irq += IT8172_LPC_IRQ_BASE;
285 void show_pending_irqs(void)
287 fputs("intstatus: ");
288 put32(it8172_hw0_icregs->intstatus);
292 put32(it8172_hw0_icregs->pci_req);
296 put32(it8172_hw0_icregs->lb_req);
300 put32(it8172_hw0_icregs->lpc_req);