1 /*
2 * linux/arch/h8300/platform/h8s/ints_h8s.c
3 * Interrupt handling CPU variants
4 *
5 * Yoshinori Sato <ysato@users.sourceforge.jp>
6 *
7 */
8
9 #include <linux/init.h>
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
12
13 #include <asm/ptrace.h>
14 #include <asm/traps.h>
15 #include <asm/irq.h>
16 #include <asm/io.h>
17 #include <asm/gpio-internal.h>
18 #include <asm/regs267x.h>
19
20 /* saved vector list */
21 const int __initdata h8300_saved_vectors[]={
22 #if defined(CONFIG_GDB_DEBUG)
23 TRACE_VEC,
24 TRAP3_VEC,
25 #endif
26 -1
27 };
28
29 /* trap entry table */
30 const H8300_VECTOR __initdata h8300_trap_table[] = {
31 0,0,0,0,0,
32 trace_break, /* TRACE */
33 0,0,
34 system_call, /* TRAPA #0 */
35 0,0,0,0,0,0,0
36 };
37
38 /* IRQ pin assignment */
39 struct irq_pins {
40 unsigned char port_no;
41 unsigned char bit_no;
42 } __attribute__((aligned(1),packed));
43 /* ISTR = 0 */
44 static const struct irq_pins irq_assign_table0[16]={
45 {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
46 {H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
47 {H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
48 {H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
49 {H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
50 {H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
51 {H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
52 {H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
53 };
54 /* ISTR = 1 */
55 static const struct irq_pins irq_assign_table1[16]={
56 {H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
57 {H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
58 {H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
59 {H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
60 {H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
61 {H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
62 {H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
63 {H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
64 };
65
66 /* IRQ to GPIO pin translation */
67 #define IRQ_GPIO_MAP(irqbit,irq,port,bit) \
68 do { \
69 if (*(volatile unsigned short *)ITSR & irqbit) { \
70 port = irq_assign_table1[irq - EXT_IRQ0].port_no; \
71 bit = irq_assign_table1[irq - EXT_IRQ0].bit_no; \
72 } else { \
73 port = irq_assign_table0[irq - EXT_IRQ0].port_no; \
74 bit = irq_assign_table0[irq - EXT_IRQ0].bit_no; \
75 } \
76 } while(0)
77
h8300_enable_irq_pin(unsigned int irq)78 int h8300_enable_irq_pin(unsigned int irq)
79 {
80 if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
81 unsigned short ptn = 1 << (irq - EXT_IRQ0);
82 unsigned int port_no,bit_no;
83 IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
84 if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
85 return -EBUSY; /* pin already use */
86 H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
87 *(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
88 }
89
90 return 0;
91 }
92
h8300_disable_irq_pin(unsigned int irq)93 void h8300_disable_irq_pin(unsigned int irq)
94 {
95 if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
96 /* disable interrupt & release IRQ pin */
97 unsigned short ptn = 1 << (irq - EXT_IRQ0);
98 unsigned short port_no,bit_no;
99 *(volatile unsigned short *)ISR &= ~ptn;
100 *(volatile unsigned short *)IER &= ~ptn;
101 IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
102 H8300_GPIO_FREE(port_no, bit_no);
103 }
104 }
105