1 | /* ictrl.c |
---|
2 | * |
---|
3 | * This routine installs and handles external interrupt vectors for |
---|
4 | * PowerPC 403 CPU built-in external interrupt controller |
---|
5 | * |
---|
6 | * Author: Thomas Doerfler <td@imd.m.isar.de> |
---|
7 | * |
---|
8 | * COPYRIGHT (c) 1998 by IMD, Puchheim, Germany |
---|
9 | * |
---|
10 | * To anyone who acknowledges that this file is provided "AS IS" |
---|
11 | * without any express or implied warranty: |
---|
12 | * permission to use, copy, modify, and distribute this file |
---|
13 | * for any purpose is hereby granted without fee, provided that |
---|
14 | * the above copyright notice and this notice appears in all |
---|
15 | * copies, and that the name of IMD not be used in |
---|
16 | * advertising or publicity pertaining to distribution of the |
---|
17 | * software without specific, written prior permission. |
---|
18 | * IMD makes no representations about the suitability |
---|
19 | * of this software for any purpose. |
---|
20 | * |
---|
21 | */ |
---|
22 | |
---|
23 | #include "ictrl.h" |
---|
24 | #include <rtems.h> |
---|
25 | #include <rtems/libio.h> |
---|
26 | |
---|
27 | #include <stdlib.h> /* for atexit() */ |
---|
28 | |
---|
29 | /* |
---|
30 | * ISR vector table to dispatch external interrupts |
---|
31 | */ |
---|
32 | |
---|
33 | rtems_isr_entry ictrl_vector_table[PPC_IRQ_EXT_MAX]; |
---|
34 | |
---|
35 | /* |
---|
36 | * |
---|
37 | * some utilities to access the EXI* registers |
---|
38 | * |
---|
39 | */ |
---|
40 | |
---|
41 | /* |
---|
42 | * clear bits in EXISR that have a bit set in mask |
---|
43 | */ |
---|
44 | RTEMS_INLINE_ROUTINE void |
---|
45 | clr_exisr(unsigned32 mask) |
---|
46 | { |
---|
47 | asm volatile ("mtdcr 0x40,%0"::"r" (mask));/*EXISR*/ |
---|
48 | } |
---|
49 | |
---|
50 | /* |
---|
51 | * get value of EXISR |
---|
52 | */ |
---|
53 | RTEMS_INLINE_ROUTINE unsigned32 |
---|
54 | get_exisr(void) |
---|
55 | { |
---|
56 | unsigned32 val; |
---|
57 | |
---|
58 | asm volatile ("mfdcr %0,0x40":"=r" (val));/*EXISR*/ |
---|
59 | return val; |
---|
60 | } |
---|
61 | |
---|
62 | /* |
---|
63 | * get value of EXIER |
---|
64 | */ |
---|
65 | RTEMS_INLINE_ROUTINE unsigned32 |
---|
66 | get_exier(void) |
---|
67 | { |
---|
68 | unsigned32 val; |
---|
69 | asm volatile ("mfdcr %0,0x42":"=r" (val));/*EXIER*/ |
---|
70 | return val; |
---|
71 | } |
---|
72 | |
---|
73 | /* |
---|
74 | * set value of EXIER |
---|
75 | */ |
---|
76 | RTEMS_INLINE_ROUTINE void |
---|
77 | set_exier(unsigned32 val) |
---|
78 | { |
---|
79 | asm volatile ("mtdcr 0x42,%0"::"r" (val));/*EXIER*/ |
---|
80 | } |
---|
81 | |
---|
82 | /* |
---|
83 | * enable an external interrupt, make this interrupt consistent |
---|
84 | */ |
---|
85 | RTEMS_INLINE_ROUTINE void |
---|
86 | enable_ext_irq( unsigned32 mask) |
---|
87 | { |
---|
88 | unsigned32 isrlvl; |
---|
89 | _CPU_ISR_Disable(isrlvl); |
---|
90 | set_exier(get_exier() | ((mask)&PPC_EXI_MASK)); |
---|
91 | _CPU_ISR_Enable(isrlvl); |
---|
92 | } |
---|
93 | |
---|
94 | /* |
---|
95 | * disable an external interrupt, make this interrupt consistent |
---|
96 | */ |
---|
97 | RTEMS_INLINE_ROUTINE void |
---|
98 | disable_ext_irq( unsigned32 mask) |
---|
99 | { |
---|
100 | unsigned32 isrlvl; |
---|
101 | _CPU_ISR_Disable(isrlvl); |
---|
102 | set_exier(get_exier() & ~(mask) & PPC_EXI_MASK); |
---|
103 | _CPU_ISR_Enable(isrlvl); |
---|
104 | } |
---|
105 | |
---|
106 | /* |
---|
107 | * |
---|
108 | * this function is called, when a external interrupt is present and |
---|
109 | * enabled but there is no handler installed. It will clear |
---|
110 | * the corresponding enable bits and call the spurious handler |
---|
111 | * present in the CPU Configuration Table, if any. |
---|
112 | * |
---|
113 | */ |
---|
114 | void |
---|
115 | ictrl_spurious_handler(unsigned32 spurious_mask, |
---|
116 | CPU_Interrupt_frame *cpu_frame) |
---|
117 | { |
---|
118 | int v; |
---|
119 | |
---|
120 | for (v=0; v < PPC_IRQ_EXT_MAX; v++) { |
---|
121 | if (VEC_TO_EXMSK(v) & spurious_mask) { |
---|
122 | clr_exisr(VEC_TO_EXMSK(v)); |
---|
123 | disable_ext_irq(VEC_TO_EXMSK(v)); |
---|
124 | #if 0 |
---|
125 | printf("spurious external interrupt: %d at pc 0x%x; disabling\n", |
---|
126 | vector, cpu_frame->Interrupt.pcoqfront); |
---|
127 | #endif |
---|
128 | if (rtems_cpu_configuration_get_spurious_handler()) { |
---|
129 | rtems_cpu_configuration_get_spurious_handler()(v + PPC_IRQ_EXT_BASE,cpu_frame); |
---|
130 | } |
---|
131 | } |
---|
132 | } |
---|
133 | } |
---|
134 | |
---|
135 | |
---|
136 | /* |
---|
137 | * ISR Handler: this is called from the primary exception dispatcher |
---|
138 | */ |
---|
139 | |
---|
140 | void |
---|
141 | ictrl_isr(rtems_vector_number vector,CPU_Interrupt_frame *cpu_frame) |
---|
142 | { |
---|
143 | unsigned32 istat, |
---|
144 | mask, |
---|
145 | global_vec; |
---|
146 | int exvec; |
---|
147 | rtems_isr_entry handler; |
---|
148 | |
---|
149 | istat = get_exisr() & get_exier() & PPC_EXI_MASK; |
---|
150 | |
---|
151 | /* FIXME: this may be speeded up using cntlzw instruction */ |
---|
152 | for (exvec = 0;exvec < PPC_IRQ_EXT_MAX;exvec++) { |
---|
153 | mask = VEC_TO_EXMSK(exvec); |
---|
154 | if (0 != (istat & mask)) { |
---|
155 | clr_exisr(mask); |
---|
156 | handler = ictrl_vector_table[exvec]; |
---|
157 | if (handler) { |
---|
158 | istat &= ~mask; |
---|
159 | global_vec = exvec + PPC_IRQ_EXT_BASE; |
---|
160 | (handler)(global_vec); |
---|
161 | } |
---|
162 | } |
---|
163 | } |
---|
164 | if (istat != 0) { /* anything left? then we have a spurious interrupt */ |
---|
165 | ictrl_spurious_handler(istat,cpu_frame); |
---|
166 | } |
---|
167 | } |
---|
168 | |
---|
169 | /* |
---|
170 | * |
---|
171 | * the following functions form the user interface |
---|
172 | * |
---|
173 | */ |
---|
174 | |
---|
175 | /* |
---|
176 | * |
---|
177 | * install a user vector for one of the external interrupt sources |
---|
178 | * |
---|
179 | */ |
---|
180 | rtems_status_code |
---|
181 | ictrl_set_vector(rtems_isr_entry new_handler, |
---|
182 | unsigned32 vector, |
---|
183 | rtems_isr_entry *old_handler |
---|
184 | ) |
---|
185 | { |
---|
186 | /* |
---|
187 | * We put the actual user ISR address in 'ictrl_vector_table'. This will |
---|
188 | * be used by the _ictrl_isr so the user gets control. |
---|
189 | */ |
---|
190 | |
---|
191 | /* check for valid vector range */ |
---|
192 | if ((vector >= PPC_IRQ_EXT_BASE) && |
---|
193 | (vector < PPC_IRQ_EXT_BASE + PPC_IRQ_EXT_MAX)) { |
---|
194 | |
---|
195 | /* return old handler entry */ |
---|
196 | *old_handler = ictrl_vector_table[vector - PPC_IRQ_EXT_BASE]; |
---|
197 | |
---|
198 | if (new_handler != NULL) { |
---|
199 | /* store handler function... */ |
---|
200 | ictrl_vector_table[vector - PPC_IRQ_EXT_BASE] = new_handler; |
---|
201 | /* then enable it in EXIER register */ |
---|
202 | enable_ext_irq(VEC_TO_EXMSK(vector - PPC_IRQ_EXT_BASE)); |
---|
203 | } |
---|
204 | else { /* new_handler == NULL */ |
---|
205 | /* then disable it in EXIER register */ |
---|
206 | disable_ext_irq(VEC_TO_EXMSK(vector - PPC_IRQ_EXT_BASE)); |
---|
207 | ictrl_vector_table[vector - PPC_IRQ_EXT_BASE] = NULL; |
---|
208 | } |
---|
209 | return RTEMS_SUCCESSFUL; |
---|
210 | } |
---|
211 | else { |
---|
212 | return RTEMS_INVALID_NUMBER; |
---|
213 | } |
---|
214 | } |
---|
215 | |
---|
216 | /* |
---|
217 | * Called via atexit() |
---|
218 | * deactivate the interrupt controller |
---|
219 | */ |
---|
220 | |
---|
221 | void |
---|
222 | ictrl_exit(void) |
---|
223 | { |
---|
224 | /* mark them all unused */ |
---|
225 | disable_ext_irq(~0); |
---|
226 | clr_exisr(~0); |
---|
227 | |
---|
228 | } |
---|
229 | |
---|
230 | /* |
---|
231 | * activate the interrupt controller |
---|
232 | */ |
---|
233 | |
---|
234 | rtems_status_code |
---|
235 | ictrl_init(void) |
---|
236 | { |
---|
237 | proc_ptr dummy; |
---|
238 | |
---|
239 | /* mark them all unused */ |
---|
240 | disable_ext_irq(~0); |
---|
241 | clr_exisr(~0); |
---|
242 | |
---|
243 | /* install the external interrupt handler */ |
---|
244 | _CPU_ISR_install_vector(PPC_IRQ_EXTERNAL, |
---|
245 | ictrl_isr, |
---|
246 | &dummy); |
---|
247 | atexit(ictrl_exit); |
---|
248 | return RTEMS_SUCCESSFUL; |
---|
249 | } |
---|
250 | |
---|