Linux Kernel  3.7.1
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ints.c
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1 /*
2  * linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License. See the file COPYING in the main directory of this archive
6  * for more details.
7  *
8  * Copyright (c) 2000 Michael Leslie <[email protected]>
9  * Copyright (c) 1996 Roman Zippel
10  * Copyright (c) 1999 D. Jeff Dionne <[email protected]>
11  */
12 
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <asm/traps.h>
19 #include <asm/machdep.h>
20 #include <asm/m68360.h>
21 
22 /* from quicc/commproc.c: */
23 extern QUICC *pquicc;
24 extern void cpm_interrupt_init(void);
25 
26 #define INTERNAL_IRQS (96)
27 
28 /* assembler routines */
29 asmlinkage void system_call(void);
30 asmlinkage void buserr(void);
31 asmlinkage void trap(void);
32 asmlinkage void bad_interrupt(void);
33 asmlinkage void inthandler(void);
34 
35 static void intc_irq_unmask(struct irq_data *d)
36 {
37  pquicc->intr_cimr |= (1 << d->irq);
38 }
39 
40 static void intc_irq_mask(struct irq_data *d)
41 {
42  pquicc->intr_cimr &= ~(1 << d->irq);
43 }
44 
45 static void intc_irq_ack(struct irq_data *d)
46 {
47  pquicc->intr_cisr = (1 << d->irq);
48 }
49 
50 static struct irq_chip intc_irq_chip = {
51  .name = "M68K-INTC",
52  .irq_mask = intc_irq_mask,
53  .irq_unmask = intc_irq_unmask,
54  .irq_ack = intc_irq_ack,
55 };
56 
57 /*
58  * This function should be called during kernel startup to initialize
59  * the vector table.
60  */
61 void __init trap_init(void)
62 {
63  int vba = (CPM_VECTOR_BASE<<4);
64 
65  /* set up the vectors */
66  _ramvec[2] = buserr;
67  _ramvec[3] = trap;
68  _ramvec[4] = trap;
69  _ramvec[5] = trap;
70  _ramvec[6] = trap;
71  _ramvec[7] = trap;
72  _ramvec[8] = trap;
73  _ramvec[9] = trap;
74  _ramvec[10] = trap;
75  _ramvec[11] = trap;
76  _ramvec[12] = trap;
77  _ramvec[13] = trap;
78  _ramvec[14] = trap;
79  _ramvec[15] = trap;
80 
81  _ramvec[32] = system_call;
82  _ramvec[33] = trap;
83 
84  cpm_interrupt_init();
85 
86  /* set up CICR for vector base address and irq level */
87  /* irl = 4, hp = 1f - see MC68360UM p 7-377 */
88  pquicc->intr_cicr = 0x00e49f00 | vba;
89 
90  /* CPM interrupt vectors: (p 7-376) */
91  _ramvec[vba+CPMVEC_ERROR] = bad_interrupt; /* Error */
92  _ramvec[vba+CPMVEC_PIO_PC11] = inthandler; /* pio - pc11 */
93  _ramvec[vba+CPMVEC_PIO_PC10] = inthandler; /* pio - pc10 */
94  _ramvec[vba+CPMVEC_SMC2] = inthandler; /* smc2/pip */
95  _ramvec[vba+CPMVEC_SMC1] = inthandler; /* smc1 */
96  _ramvec[vba+CPMVEC_SPI] = inthandler; /* spi */
97  _ramvec[vba+CPMVEC_PIO_PC9] = inthandler; /* pio - pc9 */
98  _ramvec[vba+CPMVEC_TIMER4] = inthandler; /* timer 4 */
99  _ramvec[vba+CPMVEC_RESERVED1] = inthandler; /* reserved */
100  _ramvec[vba+CPMVEC_PIO_PC8] = inthandler; /* pio - pc8 */
101  _ramvec[vba+CPMVEC_PIO_PC7] = inthandler; /* pio - pc7 */
102  _ramvec[vba+CPMVEC_PIO_PC6] = inthandler; /* pio - pc6 */
103  _ramvec[vba+CPMVEC_TIMER3] = inthandler; /* timer 3 */
104  _ramvec[vba+CPMVEC_PIO_PC5] = inthandler; /* pio - pc5 */
105  _ramvec[vba+CPMVEC_PIO_PC4] = inthandler; /* pio - pc4 */
106  _ramvec[vba+CPMVEC_RESERVED2] = inthandler; /* reserved */
107  _ramvec[vba+CPMVEC_RISCTIMER] = inthandler; /* timer table */
108  _ramvec[vba+CPMVEC_TIMER2] = inthandler; /* timer 2 */
109  _ramvec[vba+CPMVEC_RESERVED3] = inthandler; /* reserved */
110  _ramvec[vba+CPMVEC_IDMA2] = inthandler; /* idma 2 */
111  _ramvec[vba+CPMVEC_IDMA1] = inthandler; /* idma 1 */
112  _ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler; /* sdma channel bus error */
113  _ramvec[vba+CPMVEC_PIO_PC3] = inthandler; /* pio - pc3 */
114  _ramvec[vba+CPMVEC_PIO_PC2] = inthandler; /* pio - pc2 */
115  /* _ramvec[vba+CPMVEC_TIMER1] = cpm_isr_timer1; */ /* timer 1 */
116  _ramvec[vba+CPMVEC_TIMER1] = inthandler; /* timer 1 */
117  _ramvec[vba+CPMVEC_PIO_PC1] = inthandler; /* pio - pc1 */
118  _ramvec[vba+CPMVEC_SCC4] = inthandler; /* scc 4 */
119  _ramvec[vba+CPMVEC_SCC3] = inthandler; /* scc 3 */
120  _ramvec[vba+CPMVEC_SCC2] = inthandler; /* scc 2 */
121  _ramvec[vba+CPMVEC_SCC1] = inthandler; /* scc 1 */
122  _ramvec[vba+CPMVEC_PIO_PC0] = inthandler; /* pio - pc0 */
123 
124 
125  /* turn off all CPM interrupts */
126  pquicc->intr_cimr = 0x00000000;
127 }
128 
129 void init_IRQ(void)
130 {
131  int i;
132 
133  for (i = 0; (i < NR_IRQS); i++) {
134  irq_set_chip(i, &intc_irq_chip);
135  irq_set_handler(i, handle_level_irq);
136  }
137 }
138 
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