Pull ec into release branch
[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 extern void set_debug_traps(void);
66 extern void mips_timer_interrupt(int irq, struct pt_regs *regs);
67
68 struct it8172_intc_regs volatile *it8172_hw0_icregs =
69         (struct it8172_intc_regs volatile *)(KSEG1ADDR(IT8172_PCI_IO_BASE + IT_INTC_BASE));
70
71 static void disable_it8172_irq(unsigned int irq_nr)
72 {
73         if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
74                 /* LPC interrupt */
75                 it8172_hw0_icregs->lpc_mask |=
76                         (1 << (irq_nr - IT8172_LPC_IRQ_BASE));
77         } else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
78                 /* Local Bus interrupt */
79                 it8172_hw0_icregs->lb_mask |=
80                         (1 << (irq_nr - IT8172_LB_IRQ_BASE));
81         } else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
82                 /* PCI and other interrupts */
83                 it8172_hw0_icregs->pci_mask |=
84                         (1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
85         } else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
86                 /* NMI interrupts */
87                 it8172_hw0_icregs->nmi_mask |=
88                         (1 << (irq_nr - IT8172_NMI_IRQ_BASE));
89         } else {
90                 panic("disable_it8172_irq: bad irq %d", irq_nr);
91         }
92 }
93
94 static void enable_it8172_irq(unsigned int irq_nr)
95 {
96         if ( (irq_nr >= IT8172_LPC_IRQ_BASE) && (irq_nr <= IT8172_SERIRQ_15)) {
97                 /* LPC interrupt */
98                 it8172_hw0_icregs->lpc_mask &=
99                         ~(1 << (irq_nr - IT8172_LPC_IRQ_BASE));
100         }
101         else if ( (irq_nr >= IT8172_LB_IRQ_BASE) && (irq_nr <= IT8172_IOCHK_IRQ)) {
102                 /* Local Bus interrupt */
103                 it8172_hw0_icregs->lb_mask &=
104                         ~(1 << (irq_nr - IT8172_LB_IRQ_BASE));
105         }
106         else if ( (irq_nr >= IT8172_PCI_DEV_IRQ_BASE) && (irq_nr <= IT8172_DMA_IRQ)) {
107                 /* PCI and other interrupts */
108                 it8172_hw0_icregs->pci_mask &=
109                         ~(1 << (irq_nr - IT8172_PCI_DEV_IRQ_BASE));
110         }
111         else if ( (irq_nr >= IT8172_NMI_IRQ_BASE) && (irq_nr <= IT8172_POWER_NMI_IRQ)) {
112                 /* NMI interrupts */
113                 it8172_hw0_icregs->nmi_mask &=
114                         ~(1 << (irq_nr - IT8172_NMI_IRQ_BASE));
115         }
116         else {
117                 panic("enable_it8172_irq: bad irq %d", irq_nr);
118         }
119 }
120
121 static unsigned int startup_ite_irq(unsigned int irq)
122 {
123         enable_it8172_irq(irq);
124         return 0;
125 }
126
127 #define shutdown_ite_irq        disable_it8172_irq
128 #define mask_and_ack_ite_irq    disable_it8172_irq
129
130 static void end_ite_irq(unsigned int irq)
131 {
132         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
133                 enable_it8172_irq(irq);
134 }
135
136 static struct hw_interrupt_type it8172_irq_type = {
137         .typename = "ITE8172",
138         .startup = startup_ite_irq,
139         .shutdown = shutdown_ite_irq,
140         .enable = enable_it8172_irq,
141         .disable = disable_it8172_irq,
142         .ack = mask_and_ack_ite_irq,
143         .end = end_ite_irq,
144 };
145
146
147 static void enable_none(unsigned int irq) { }
148 static unsigned int startup_none(unsigned int irq) { return 0; }
149 static void disable_none(unsigned int irq) { }
150 static void ack_none(unsigned int irq) { }
151
152 /* startup is the same as "enable", shutdown is same as "disable" */
153 #define shutdown_none   disable_none
154 #define end_none        enable_none
155
156 static struct hw_interrupt_type cp0_irq_type = {
157         .typename = "CP0 Count",
158         .startup = startup_none,
159         .shutdown = shutdown_none,
160         .enable = enable_none,
161         .disable = disable_none,
162         .ack = ack_none,
163         .end = end_none
164 };
165
166 void enable_cpu_timer(void)
167 {
168         unsigned long flags;
169
170         local_irq_save(flags);
171         set_c0_status(0x100 << EXT_IRQ5_TO_IP);
172         local_irq_restore(flags);
173 }
174
175 void __init arch_init_irq(void)
176 {
177         int i;
178         unsigned long flags;
179
180         /* mask all interrupts */
181         it8172_hw0_icregs->lb_mask  = 0xffff;
182         it8172_hw0_icregs->lpc_mask = 0xffff;
183         it8172_hw0_icregs->pci_mask = 0xffff;
184         it8172_hw0_icregs->nmi_mask = 0xffff;
185
186         /* make all interrupts level triggered */
187         it8172_hw0_icregs->lb_trigger  = 0;
188         it8172_hw0_icregs->lpc_trigger = 0;
189         it8172_hw0_icregs->pci_trigger = 0;
190         it8172_hw0_icregs->nmi_trigger = 0;
191
192         /* active level setting */
193         /* uart, keyboard, and mouse are active high */
194         it8172_hw0_icregs->lpc_level = (0x10 | 0x2 | 0x1000);
195         it8172_hw0_icregs->lb_level |= 0x20;
196
197         /* keyboard and mouse are edge triggered */
198         it8172_hw0_icregs->lpc_trigger |= (0x2 | 0x1000);
199
200
201 #if 0
202         // Enable this piece of code to make internal USB interrupt
203         // edge triggered.
204         it8172_hw0_icregs->pci_trigger |=
205                 (1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
206         it8172_hw0_icregs->pci_level &=
207                 ~(1 << (IT8172_USB_IRQ - IT8172_PCI_DEV_IRQ_BASE));
208 #endif
209
210         for (i = 0; i <= IT8172_LAST_IRQ; i++) {
211                 irq_desc[i].handler = &it8172_irq_type;
212                 spin_lock_init(&irq_desc[i].lock);
213         }
214         irq_desc[MIPS_CPU_TIMER_IRQ].handler = &cp0_irq_type;
215         set_c0_status(ALLINTS_NOTIMER);
216 }
217
218 void mips_spurious_interrupt(struct pt_regs *regs)
219 {
220 #if 1
221         return;
222 #else
223         unsigned long status, cause;
224
225         printk("got spurious interrupt\n");
226         status = read_c0_status();
227         cause = read_c0_cause();
228         printk("status %x cause %x\n", status, cause);
229         printk("epc %x badvaddr %x \n", regs->cp0_epc, regs->cp0_badvaddr);
230 #endif
231 }
232
233 void it8172_hw0_irqdispatch(struct pt_regs *regs)
234 {
235         int irq;
236         unsigned short intstatus = 0, status = 0;
237
238         intstatus = it8172_hw0_icregs->intstatus;
239         if (intstatus & 0x8) {
240                 panic("Got NMI interrupt");
241         } else if (intstatus & 0x4) {
242                 /* PCI interrupt */
243                 irq = 0;
244                 status |= it8172_hw0_icregs->pci_req;
245                 while (!(status & 0x1)) {
246                         irq++;
247                         status >>= 1;
248                 }
249                 irq += IT8172_PCI_DEV_IRQ_BASE;
250         } else if (intstatus & 0x1) {
251                 /* Local Bus interrupt */
252                 irq = 0;
253                 status |= it8172_hw0_icregs->lb_req;
254                 while (!(status & 0x1)) {
255                         irq++;
256                         status >>= 1;
257                 }
258                 irq += IT8172_LB_IRQ_BASE;
259         } else if (intstatus & 0x2) {
260                 /* LPC interrupt */
261                 /* Since some lpc interrupts are edge triggered,
262                  * we could lose an interrupt this way because
263                  * we acknowledge all ints at onces. Revisit.
264                  */
265                 status |= it8172_hw0_icregs->lpc_req;
266                 it8172_hw0_icregs->lpc_req = 0; /* acknowledge ints */
267                 irq = 0;
268                 while (!(status & 0x1)) {
269                         irq++;
270                         status >>= 1;
271                 }
272                 irq += IT8172_LPC_IRQ_BASE;
273         } else
274                 return;
275
276         do_IRQ(irq, regs);
277 }
278
279 asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
280 {
281         unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
282
283         if (!pending)
284                 mips_spurious_interrupt(regs);
285         else if (pending & CAUSEF_IP7)
286                 ll_timer_interrupt(127, regs);
287         else if (pending & CAUSEF_IP2)
288                 it8172_hw0_irqdispatch(regs);
289 }
290
291 void show_pending_irqs(void)
292 {
293         fputs("intstatus:  ");
294         put32(it8172_hw0_icregs->intstatus);
295         puts("");
296
297         fputs("pci_req:  ");
298         put32(it8172_hw0_icregs->pci_req);
299         puts("");
300
301         fputs("lb_req:  ");
302         put32(it8172_hw0_icregs->lb_req);
303         puts("");
304
305         fputs("lpc_req:  ");
306         put32(it8172_hw0_icregs->lpc_req);
307         puts("");
308 }