1 | /* |
---|
2 | * This file contains the implementation of the function described in irq.h |
---|
3 | */ |
---|
4 | |
---|
5 | /* |
---|
6 | * Copyright (c) 2009 embedded brains GmbH |
---|
7 | * Copyright (C) 1998 valette@crf.canon.fr |
---|
8 | * |
---|
9 | * The license and distribution terms for this file may be |
---|
10 | * found in the file LICENSE in this distribution or at |
---|
11 | * http://www.rtems.org/license/LICENSE. |
---|
12 | */ |
---|
13 | |
---|
14 | #include <bsp.h> |
---|
15 | #include <bsp/irq.h> |
---|
16 | #include <bsp/irq-generic.h> |
---|
17 | |
---|
18 | #include <stdlib.h> |
---|
19 | #include <stdio.h> |
---|
20 | #include <inttypes.h> |
---|
21 | |
---|
22 | /* |
---|
23 | * pointer to the mask representing the additionnal irq vectors |
---|
24 | * that must be disabled when a particular entry is activated. |
---|
25 | * They will be dynamically computed from teh prioruty table given |
---|
26 | * in BSP_rtems_irq_mngt_set(); |
---|
27 | * CAUTION : this table is accessed directly by interrupt routine |
---|
28 | * prologue. |
---|
29 | */ |
---|
30 | rtems_i8259_masks irq_mask_or_tbl[BSP_IRQ_LINES_NUMBER]; |
---|
31 | |
---|
32 | uint32_t irq_count[BSP_IRQ_LINES_NUMBER] = {0}; |
---|
33 | |
---|
34 | uint32_t |
---|
35 | BSP_irq_count_dump(FILE *f) |
---|
36 | { |
---|
37 | uint32_t tot = 0; |
---|
38 | int i; |
---|
39 | if ( !f ) |
---|
40 | f = stdout; |
---|
41 | for ( i=0; i<BSP_IRQ_LINES_NUMBER; i++ ) { |
---|
42 | tot += irq_count[i]; |
---|
43 | fprintf(f,"IRQ %2u: %9"PRIu32"\n", i, irq_count[i]); |
---|
44 | } |
---|
45 | return tot; |
---|
46 | } |
---|
47 | |
---|
48 | /*-------------------------------------------------------------------------+ |
---|
49 | | Cache for 1st and 2nd PIC IRQ line's status (enabled or disabled) register. |
---|
50 | +--------------------------------------------------------------------------*/ |
---|
51 | /* |
---|
52 | * lower byte is interrupt mask on the master PIC. |
---|
53 | * while upper bits are interrupt on the slave PIC. |
---|
54 | * This cache is initialized in ldseg.s |
---|
55 | */ |
---|
56 | rtems_i8259_masks i8259s_cache = 0xFFFB; |
---|
57 | rtems_i8259_masks i8259s_super_imr = 0xFFFB; |
---|
58 | |
---|
59 | /*-------------------------------------------------------------------------+ |
---|
60 | | Function: BSP_irq_disable_at_i8259s |
---|
61 | | Description: Mask IRQ line in appropriate PIC chip. |
---|
62 | | Global Variables: i8259s_cache |
---|
63 | | Arguments: vector_offset - number of IRQ line to mask. |
---|
64 | | Returns: Nothing. |
---|
65 | +--------------------------------------------------------------------------*/ |
---|
66 | int BSP_irq_disable_at_i8259s (const rtems_irq_number irqLine) |
---|
67 | { |
---|
68 | unsigned short mask; |
---|
69 | rtems_interrupt_level level; |
---|
70 | |
---|
71 | if ( ((int)irqLine < BSP_LOWEST_OFFSET) || |
---|
72 | ((int)irqLine > BSP_MAX_ON_i8259S ) |
---|
73 | ) |
---|
74 | return 1; |
---|
75 | |
---|
76 | rtems_interrupt_disable(level); |
---|
77 | |
---|
78 | mask = 1 << irqLine; |
---|
79 | i8259s_cache |= mask; |
---|
80 | i8259s_super_imr |= mask; |
---|
81 | |
---|
82 | if (irqLine < 8) |
---|
83 | { |
---|
84 | outport_byte(PIC_MASTER_IMR_IO_PORT, i8259s_cache & 0xff); |
---|
85 | } |
---|
86 | else |
---|
87 | { |
---|
88 | outport_byte(PIC_SLAVE_IMR_IO_PORT, ((i8259s_cache & 0xff00) >> 8)); |
---|
89 | } |
---|
90 | rtems_interrupt_enable(level); |
---|
91 | |
---|
92 | return 0; |
---|
93 | } |
---|
94 | |
---|
95 | /*-------------------------------------------------------------------------+ |
---|
96 | | Function: BSP_irq_enable_at_i8259s |
---|
97 | | Description: Unmask IRQ line in appropriate PIC chip. |
---|
98 | | Global Variables: i8259s_cache |
---|
99 | | Arguments: irqLine - number of IRQ line to mask. |
---|
100 | | Returns: Nothing. |
---|
101 | +--------------------------------------------------------------------------*/ |
---|
102 | int BSP_irq_enable_at_i8259s (const rtems_irq_number irqLine) |
---|
103 | { |
---|
104 | unsigned short mask; |
---|
105 | rtems_interrupt_level level; |
---|
106 | |
---|
107 | if ( ((int)irqLine < BSP_LOWEST_OFFSET) || |
---|
108 | ((int)irqLine > BSP_MAX_ON_i8259S ) |
---|
109 | ) |
---|
110 | return 1; |
---|
111 | |
---|
112 | rtems_interrupt_disable(level); |
---|
113 | |
---|
114 | mask = ~(1 << irqLine); |
---|
115 | i8259s_cache &= mask; |
---|
116 | i8259s_super_imr &= mask; |
---|
117 | |
---|
118 | if (irqLine < 8) |
---|
119 | { |
---|
120 | outport_byte(PIC_MASTER_IMR_IO_PORT, i8259s_cache & 0xff); |
---|
121 | } |
---|
122 | else |
---|
123 | { |
---|
124 | outport_byte(PIC_SLAVE_IMR_IO_PORT, ((i8259s_cache & 0xff00) >> 8)); |
---|
125 | } |
---|
126 | rtems_interrupt_enable(level); |
---|
127 | |
---|
128 | return 0; |
---|
129 | } /* mask_irq */ |
---|
130 | |
---|
131 | int BSP_irq_enabled_at_i8259s (const rtems_irq_number irqLine) |
---|
132 | { |
---|
133 | unsigned short mask; |
---|
134 | |
---|
135 | if ( ((int)irqLine < BSP_LOWEST_OFFSET) || |
---|
136 | ((int)irqLine > BSP_MAX_ON_i8259S ) |
---|
137 | ) |
---|
138 | return 1; |
---|
139 | |
---|
140 | mask = (1 << irqLine); |
---|
141 | return (~(i8259s_cache & mask)); |
---|
142 | } |
---|
143 | |
---|
144 | /*-------------------------------------------------------------------------+ |
---|
145 | | Function: BSP_irq_ack_at_i8259s |
---|
146 | | Description: Signal generic End Of Interrupt (EOI) to appropriate PIC. |
---|
147 | | Global Variables: None. |
---|
148 | | Arguments: irqLine - number of IRQ line to acknowledge. |
---|
149 | | Returns: Nothing. |
---|
150 | +--------------------------------------------------------------------------*/ |
---|
151 | int BSP_irq_ack_at_i8259s (const rtems_irq_number irqLine) |
---|
152 | { |
---|
153 | if ( ((int)irqLine < BSP_LOWEST_OFFSET) || |
---|
154 | ((int)irqLine > BSP_MAX_ON_i8259S ) |
---|
155 | ) |
---|
156 | return 1; |
---|
157 | |
---|
158 | if (irqLine >= 8) { |
---|
159 | outport_byte(PIC_SLAVE_COMMAND_IO_PORT, PIC_EOI); |
---|
160 | } |
---|
161 | outport_byte(PIC_MASTER_COMMAND_IO_PORT, PIC_EOI); |
---|
162 | |
---|
163 | return 0; |
---|
164 | |
---|
165 | } /* ackIRQ */ |
---|
166 | |
---|
167 | /* |
---|
168 | * ------------------------ RTEMS Irq helper functions ---------------- |
---|
169 | */ |
---|
170 | |
---|
171 | static rtems_irq_prio irqPrioTable[BSP_IRQ_LINES_NUMBER]={ |
---|
172 | /* |
---|
173 | * actual priorities for each interrupt source: |
---|
174 | * 0 means that only current interrupt is masked |
---|
175 | * 255 means all other interrupts are masked |
---|
176 | * The second entry has a priority of 255 because |
---|
177 | * it is the slave pic entry and is should always remain |
---|
178 | * unmasked. |
---|
179 | */ |
---|
180 | 0,0, |
---|
181 | 255, |
---|
182 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
---|
183 | }; |
---|
184 | |
---|
185 | static void compute_i8259_masks_from_prio (void) |
---|
186 | { |
---|
187 | rtems_interrupt_level level; |
---|
188 | unsigned int i; |
---|
189 | unsigned int j; |
---|
190 | |
---|
191 | rtems_interrupt_disable(level); |
---|
192 | |
---|
193 | /* |
---|
194 | * Always mask at least current interrupt to prevent re-entrance |
---|
195 | */ |
---|
196 | for (i=0; i < BSP_IRQ_LINES_NUMBER; i++) { |
---|
197 | * ((unsigned short*) &irq_mask_or_tbl[i]) = (1 << i); |
---|
198 | for (j = 0; j < BSP_IRQ_LINES_NUMBER; j++) { |
---|
199 | /* |
---|
200 | * Mask interrupts at i8259 level that have a lower priority |
---|
201 | */ |
---|
202 | if (irqPrioTable [i] > irqPrioTable [j]) { |
---|
203 | * ((unsigned short*) &irq_mask_or_tbl[i]) |= (1 << j); |
---|
204 | } |
---|
205 | } |
---|
206 | } |
---|
207 | |
---|
208 | rtems_interrupt_enable(level); |
---|
209 | } |
---|
210 | |
---|
211 | rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector) |
---|
212 | { |
---|
213 | BSP_irq_enable_at_i8259s(vector); |
---|
214 | |
---|
215 | return RTEMS_SUCCESSFUL; |
---|
216 | } |
---|
217 | |
---|
218 | rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector) |
---|
219 | { |
---|
220 | BSP_irq_disable_at_i8259s(vector); |
---|
221 | |
---|
222 | return RTEMS_SUCCESSFUL; |
---|
223 | } |
---|
224 | |
---|
225 | rtems_status_code bsp_interrupt_facility_initialize(void) |
---|
226 | { |
---|
227 | /* |
---|
228 | * set up internal tables used by rtems interrupt prologue |
---|
229 | */ |
---|
230 | compute_i8259_masks_from_prio(); |
---|
231 | |
---|
232 | /* |
---|
233 | * must enable slave pic anyway |
---|
234 | */ |
---|
235 | BSP_irq_enable_at_i8259s(2); |
---|
236 | |
---|
237 | return RTEMS_SUCCESSFUL; |
---|
238 | } |
---|
239 | |
---|
240 | void C_dispatch_isr(int vector) |
---|
241 | { |
---|
242 | irq_count[vector]++; |
---|
243 | bsp_interrupt_handler_dispatch(vector); |
---|
244 | } |
---|