Merge branch 'atmel'
[linux-2.6] / arch / mips / ite-boards / generic / irq.c
1 /*
2  * BRIEF MODULE DESCRIPTION
3  *      ITE 8172G interrupt/setup routines.
4  *
5  * Copyright 2000,2001 MontaVista Software Inc.
6  * Author: MontaVista Software, Inc.
7  *              ppopov@mvista.com or source@mvista.com
8  *
9  * Part of this file was derived from Carsten Langgaard's
10  * arch/mips/mips-boards/atlas/atlas_int.c.
11  *
12  * Carsten Langgaard, carstenl@mips.com
13  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
14  *
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.
19  *
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.
30  *
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.
34  */
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>
50
51 #include <asm/bootinfo.h>
52 #include <asm/io.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>
58
59 /* revisit */
60 #define EXT_IRQ0_TO_IP 2 /* IP 2 */
61 #define EXT_IRQ5_TO_IP 7 /* IP 7 */
62
63 #define ALLINTS_NOTIMER (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4)
64
65 void disable_it8172_irq(unsigned int irq_nr);
66 void enable_it8172_irq(unsigned int irq_nr);
67
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);
71
72 struct it8172_intc_regs volatile *it8172_hw0_icregs =
73         (struct it8172_intc_regs volatile *)(KSEG1ADDR(IT8172_PCI_IO_BASE + IT_INTC_BASE));
74
75 static void disable_it8172_irq(unsigned int irq_nr)
76 {
77         if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
78                 /* LPC interrupt */
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)) {
90                 /* NMI interrupts */
91                 it8172_hw0_icregs->nmi_mask |=
92                         (1 << (irq_nr - IT8172_NMI_IRQ_BASE));
93         } else {
94                 panic("disable_it8172_irq: bad irq %d", irq_nr);
95         }
96 }
97
98 static void enable_it8172_irq(unsigned int irq_nr)
99 {
100         if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
101                 /* LPC interrupt */
102                 it8172_hw0_icregs->lpc_mask &=
103                         ~(1 << (irq_nr - IT8172_LPC_IRQ_BASE));
104         }
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));
109         }
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));
114         }
115         else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
116                 /* NMI interrupts */
117                 it8172_hw0_icregs->nmi_mask &=
118                         ~(1 << (irq_nr - IT8172_NMI_IRQ_BASE));
119         }
120         else {
121                 panic("enable_it8172_irq: bad irq %d", irq_nr);
122         }
123 }
124
125 static unsigned int startup_ite_irq(unsigned int irq)
126 {
127         enable_it8172_irq(irq);
128         return 0;
129 }
130
131 #define shutdown_ite_irq        disable_it8172_irq
132 #define mask_and_ack_ite_irq    disable_it8172_irq
133
134 static void end_ite_irq(unsigned int irq)
135 {
136         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
137                 enable_it8172_irq(irq);
138 }
139
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,
147         .end = end_ite_irq,
148 };
149
150
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) { }
155
156 /* startup is the same as "enable", shutdown is same as "disable" */
157 #define shutdown_none   disable_none
158 #define end_none        enable_none
159
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,
166         .ack = ack_none,
167         .end = end_none
168 };
169
170 void enable_cpu_timer(void)
171 {
172         unsigned long flags;
173
174         local_irq_save(flags);
175         set_c0_status(0x100 << EXT_IRQ5_TO_IP);
176         local_irq_restore(flags);
177 }
178
179 void __init arch_init_irq(void)
180 {
181         int i;
182         unsigned long flags;
183
184         set_except_vector(0, it8172_IRQ);
185
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;
191
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;
197
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;
202
203         /* keyboard and mouse are edge triggered */
204         it8172_hw0_icregs->lpc_trigger |= (0x2 | 0x1000);
205
206
207 #if 0
208         // Enable this piece of code to make internal USB interrupt
209         // edge triggered.
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));
214 #endif
215
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);
219         }
220         irq_desc[MIPS_CPU_TIMER_IRQ].handler = &cp0_irq_type;
221         set_c0_status(ALLINTS_NOTIMER);
222 }
223
224 void mips_spurious_interrupt(struct pt_regs *regs)
225 {
226 #if 1
227         return;
228 #else
229         unsigned long status, cause;
230
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);
236 #endif
237 }
238
239 void it8172_hw0_irqdispatch(struct pt_regs *regs)
240 {
241         int irq;
242         unsigned short intstatus = 0, status = 0;
243
244         intstatus = it8172_hw0_icregs->intstatus;
245         if (intstatus & 0x8) {
246                 panic("Got NMI interrupt");
247         } else if (intstatus & 0x4) {
248                 /* PCI interrupt */
249                 irq = 0;
250                 status |= it8172_hw0_icregs->pci_req;
251                 while (!(status & 0x1)) {
252                         irq++;
253                         status >>= 1;
254                 }
255                 irq += IT8172_PCI_DEV_IRQ_BASE;
256         } else if (intstatus & 0x1) {
257                 /* Local Bus interrupt */
258                 irq = 0;
259                 status |= it8172_hw0_icregs->lb_req;
260                 while (!(status & 0x1)) {
261                         irq++;
262                         status >>= 1;
263                 }
264                 irq += IT8172_LB_IRQ_BASE;
265         } else if (intstatus & 0x2) {
266                 /* LPC interrupt */
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.
270                  */
271                 status |= it8172_hw0_icregs->lpc_req;
272                 it8172_hw0_icregs->lpc_req = 0; /* acknowledge ints */
273                 irq = 0;
274                 while (!(status & 0x1)) {
275                         irq++;
276                         status >>= 1;
277                 }
278                 irq += IT8172_LPC_IRQ_BASE;
279         } else
280                 return;
281
282         do_IRQ(irq, regs);
283 }
284
285 void show_pending_irqs(void)
286 {
287         fputs("intstatus:  ");
288         put32(it8172_hw0_icregs->intstatus);
289         puts("");
290
291         fputs("pci_req:  ");
292         put32(it8172_hw0_icregs->pci_req);
293         puts("");
294
295         fputs("lb_req:  ");
296         put32(it8172_hw0_icregs->lb_req);
297         puts("");
298
299         fputs("lpc_req:  ");
300         put32(it8172_hw0_icregs->lpc_req);
301         puts("");
302 }