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26bf7dec AL |
1 | /* |
2 | * U-boot - interrupts.c Interrupt related routines | |
3 | * | |
155fd766 | 4 | * Copyright (c) 2005-2007 Analog Devices Inc. |
26bf7dec AL |
5 | * |
6 | * This file is based on interrupts.c | |
7 | * Copyright 1996 Roman Zippel | |
8 | * Copyright 1999 D. Jeff Dionne <jeff@uclinux.org> | |
9 | * Copyright 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca> | |
10 | * Copyright 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca> | |
11 | * Copyright 2003 Metrowerks/Motorola | |
12 | * Copyright 2003 Bas Vermeulen <bas@buyways.nl>, | |
13 | * BuyWays B.V. (www.buyways.nl) | |
14 | * | |
15 | * (C) Copyright 2000-2004 | |
16 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
17 | ||
18 | * See file CREDITS for list of people who contributed to this | |
19 | * project. | |
20 | * | |
21 | * This program is free software; you can redistribute it and/or | |
22 | * modify it under the terms of the GNU General Public License as | |
23 | * published by the Free Software Foundation; either version 2 of | |
24 | * the License, or (at your option) any later version. | |
25 | * | |
26 | * This program is distributed in the hope that it will be useful, | |
27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29 | * GNU General Public License for more details. | |
30 | * | |
31 | * You should have received a copy of the GNU General Public License | |
32 | * along with this program; if not, write to the Free Software | |
155fd766 AL |
33 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
34 | * MA 02110-1301 USA | |
26bf7dec AL |
35 | */ |
36 | ||
37 | #include <common.h> | |
38 | #include <asm/machdep.h> | |
39 | #include <asm/irq.h> | |
40 | #include <config.h> | |
41 | #include <asm/blackfin.h> | |
42 | #include "cpu.h" | |
43 | ||
44 | static ulong timestamp; | |
45 | static ulong last_time; | |
46 | static int int_flag; | |
47 | ||
48 | int irq_flags; /* needed by asm-blackfin/system.h */ | |
49 | ||
50 | /* Functions just to satisfy the linker */ | |
51 | ||
52 | /* | |
53 | * This function is derived from PowerPC code (read timebase as long long). | |
54 | * On BF533 it just returns the timer value. | |
55 | */ | |
56 | unsigned long long get_ticks(void) | |
57 | { | |
58 | return get_timer(0); | |
59 | } | |
60 | ||
61 | /* | |
62 | * This function is derived from PowerPC code (timebase clock frequency). | |
63 | * On BF533 it returns the number of timer ticks per second. | |
64 | */ | |
65 | ulong get_tbclk (void) | |
66 | { | |
67 | ulong tbclk; | |
68 | ||
69 | tbclk = CFG_HZ; | |
70 | return tbclk; | |
71 | } | |
72 | ||
73 | void enable_interrupts(void) | |
74 | { | |
75 | restore_flags(int_flag); | |
76 | } | |
77 | ||
78 | int disable_interrupts(void) | |
79 | { | |
80 | save_and_cli(int_flag); | |
81 | return 1; | |
82 | } | |
83 | ||
84 | int interrupt_init(void) | |
85 | { | |
86 | return (0); | |
87 | } | |
88 | ||
89 | void udelay(unsigned long usec) | |
90 | { | |
91 | unsigned long delay, start, stop; | |
92 | unsigned long cclk; | |
93 | cclk = (CONFIG_CCLK_HZ); | |
94 | ||
95 | while (usec > 1) { | |
96 | /* | |
97 | * how many clock ticks to delay? | |
98 | * - request(in useconds) * clock_ticks(Hz) / useconds/second | |
99 | */ | |
100 | if (usec < 1000) { | |
101 | delay = (usec * (cclk / 244)) >> 12; | |
102 | usec = 0; | |
103 | } else { | |
104 | delay = (1000 * (cclk / 244)) >> 12; | |
105 | usec -= 1000; | |
106 | } | |
107 | ||
108 | asm volatile (" %0 = CYCLES;":"=r" (start)); | |
109 | do { | |
110 | asm volatile (" %0 = CYCLES; ":"=r" (stop)); | |
111 | } while (stop - start < delay); | |
112 | } | |
113 | ||
114 | return; | |
115 | } | |
116 | ||
117 | void timer_init(void) | |
118 | { | |
119 | *pTCNTL = 0x1; | |
120 | *pTSCALE = 0x0; | |
121 | *pTCOUNT = MAX_TIM_LOAD; | |
122 | *pTPERIOD = MAX_TIM_LOAD; | |
123 | *pTCNTL = 0x7; | |
124 | asm("CSYNC;"); | |
125 | ||
126 | timestamp = 0; | |
127 | last_time = 0; | |
128 | } | |
129 | ||
130 | /* Any network command or flash | |
131 | * command is started get_timer shall | |
132 | * be called before TCOUNT gets reset, | |
133 | * to implement the accurate timeouts. | |
134 | * | |
135 | * How ever milliconds doesn't return | |
136 | * the number that has been elapsed from | |
137 | * the last reset. | |
138 | * | |
139 | * As get_timer is used in the u-boot | |
140 | * only for timeouts this should be | |
141 | * sufficient | |
142 | */ | |
143 | ulong get_timer(ulong base) | |
144 | { | |
145 | ulong milisec; | |
146 | ||
147 | /* Number of clocks elapsed */ | |
148 | ulong clocks = (MAX_TIM_LOAD - (*pTCOUNT)); | |
149 | ||
150 | /** | |
151 | * Find if the TCOUNT is reset | |
152 | * timestamp gives the number of times | |
153 | * TCOUNT got reset | |
154 | */ | |
155 | if (clocks < last_time) | |
156 | timestamp++; | |
157 | last_time = clocks; | |
158 | ||
159 | /* Get the number of milliseconds */ | |
160 | milisec = clocks / (CONFIG_CCLK_HZ / 1000); | |
161 | ||
162 | /** | |
163 | * Find the number of millisonds | |
164 | * that got elapsed before this TCOUNT cycle | |
165 | */ | |
166 | milisec += timestamp * (MAX_TIM_LOAD / (CONFIG_CCLK_HZ / 1000)); | |
167 | ||
168 | return (milisec - base); | |
169 | } | |
170 | ||
171 | void reset_timer (void) | |
172 | { | |
173 | timestamp = 0; | |
174 | } |