2 * $Id: intc.c,v 1.6 2006-06-15 10:27:10 nkeynes Exp $
4 * SH4 onboard interrupt controller (INTC) implementation
6 * Copyright (c) 2005 Nathan Keynes.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
24 struct intc_sources_t {
27 } intc_sources[INT_NUM_SOURCES] = {
28 { "IRQ0", 0x200 }, { "IRQ1", 0x220 }, { "IRQ2", 0x240 },
29 { "IRQ3", 0x260 }, { "IRQ4", 0x280 }, { "IRQ5", 0x2A0 },
30 { "IRQ6", 0x2C0 }, { "IRQ7", 0x2E0 }, { "IRQ8", 0x300 },
31 { "IRQ9", 0x320 }, { "IRQ10",0x340 }, { "IRQ11",0x360 },
32 { "IRQ12",0x380 }, { "IRQ13",0x3A0 }, { "IRQ14",0x3C0 },
33 { "NMI", 0x1C0 }, { "H-UDI",0x600 }, { "GPIOI",0x620 },
34 { "DMTE0",0x640 }, { "DMTE1",0x660 }, { "DMTE2",0x680 },
35 { "DMTE3",0x6A0 }, { "DMTAE",0x6C0 }, { "TUNI0",0x400 },
36 { "TUNI1",0x420 }, { "TUNI2",0x440 }, { "TICPI2",0x460 },
37 { "RTC_ATI",0x480 },{ "RTC_PRI",0x4A0 },{ "RTC_CUI",0x4C0 },
38 { "SCI_ERI",0x4E0 },{ "SCI_RXI",0x500 },{ "SCI_TXI",0x520 },
40 { "SCIF_ERI",0x700 },{ "SCIF_RXI",0x720, 0 },{ "SCIF_BRI",0x740 },
42 { "WDT_ITI",0x560 },{ "RCMI",0x580 }, { "ROVI",0x5A0 } };
44 static int intc_default_priority[INT_NUM_SOURCES] = { 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 16 };
46 #define PRIORITY(which) intc_state.priority[which]
47 #define INTCODE(which) intc_sources[which].code
49 static struct intc_state {
51 int pending[INT_NUM_SOURCES];
52 int priority[INT_NUM_SOURCES];
55 void mmio_region_INTC_write( uint32_t reg, uint32_t val )
57 /* Well it saves having to use an intermediate table... */
59 case ICR: /* care about this later */
62 PRIORITY(INT_TMU_TUNI0) = (val>>12)&0x000F;
63 PRIORITY(INT_TMU_TUNI1) = (val>>8)&0x000F;
64 PRIORITY(INT_TMU_TUNI2) =
65 PRIORITY(INT_TMU_TICPI2) = (val>>4)&0x000F;
66 PRIORITY(INT_RTC_ATI) =
67 PRIORITY(INT_RTC_PRI) =
68 PRIORITY(INT_RTC_CUI) = val&0x000F;
71 PRIORITY(INT_WDT_ITI) = (val>>12)&0x000F;
72 PRIORITY(INT_REF_RCMI) =
73 PRIORITY(INT_REF_ROVI) = (val>>8)&0x000F;
74 PRIORITY(INT_SCI_ERI) =
75 PRIORITY(INT_SCI_RXI) =
76 PRIORITY(INT_SCI_TXI) =
77 PRIORITY(INT_SCI_TEI) = (val>>4)&0x000F;
78 /* Bits 0-3 reserved */
81 PRIORITY(INT_GPIO) = (val>>12)&0x000F;
82 PRIORITY(INT_DMA_DMTE0) =
83 PRIORITY(INT_DMA_DMTE1) =
84 PRIORITY(INT_DMA_DMTE2) =
85 PRIORITY(INT_DMA_DMTE3) =
86 PRIORITY(INT_DMA_DMAE) = (val>>8)&0x000F;
87 PRIORITY(INT_SCIF_ERI) =
88 PRIORITY(INT_SCIF_RXI) =
89 PRIORITY(INT_SCIF_BRI) =
90 PRIORITY(INT_SCIF_TXI) = (val>>4)&0x000F;
91 PRIORITY(INT_HUDI) = val&0x000F;
94 MMIO_WRITE( INTC, reg, val );
97 int32_t mmio_region_INTC_read( uint32_t reg )
99 return MMIO_READ( INTC, reg );
106 intc_state.num_pending = 0;
107 for( i=0; i<INT_NUM_SOURCES; i++ )
108 intc_state.priority[i] = intc_default_priority[i];
109 sh4r.int_pending = 0;
113 void INTC_save_state( FILE *f )
115 fwrite( &intc_state, sizeof(intc_state), 1, f );
118 int INTC_load_state( FILE *f )
120 if( fread(&intc_state, sizeof(intc_state), 1, f) != 1 )
125 /* We basically maintain a priority queue here, raise_interrupt adds an entry,
126 * accept_interrupt takes it off. At the moment this is does as a simple
127 * ordered array, on the basis that in practice there's unlikely to be more
128 * than one at a time. There are lots of ways to optimize this if it turns out
129 * to be necessary, but I'd doubt it will be...
132 void intc_raise_interrupt( int which )
136 pri = PRIORITY(which);
137 if( pri == 0 ) return; /* masked off */
139 for( i=0; i<intc_state.num_pending; i++ ) {
140 if( intc_state.pending[i] == which ) return; /* Don't queue more than once */
141 if( PRIORITY(intc_state.pending[i]) > pri ||
142 (PRIORITY(intc_state.pending[i]) == pri &&
143 intc_state.pending[i] < which))
146 /* i == insertion point */
147 for( j=intc_state.num_pending; j > i; j-- )
148 intc_state.pending[j] = intc_state.pending[j-1];
149 intc_state.pending[i] = which;
151 if( i == intc_state.num_pending && (sh4r.sr&SR_BL)==0 && SH4_INTMASK() < pri )
152 sh4r.int_pending = 1;
154 intc_state.num_pending++;
157 void intc_clear_interrupt( int which )
160 for( i=intc_state.num_pending-1; i>=0; i-- ) {
161 if( intc_state.pending[i] == which ) {
162 /* Shift array contents down */
163 while( i < intc_state.num_pending-1 ) {
164 intc_state.pending[i] = intc_state.pending[++i];
166 intc_state.num_pending--;
174 uint32_t intc_accept_interrupt( void )
176 assert(intc_state.num_pending > 0);
177 return INTCODE(intc_state.pending[intc_state.num_pending-1]);
180 void intc_mask_changed( void )
182 if( intc_state.num_pending > 0 && (sh4r.sr&SR_BL)==0 &&
183 SH4_INTMASK() < PRIORITY(intc_state.pending[intc_state.num_pending-1]) )
184 sh4r.int_pending = 1;
185 else sh4r.int_pending = 0;
189 char *intc_get_interrupt_name( int code )
191 return intc_sources[code].name;
.