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Daniel Hellstromb3309902008-03-28 10:00:33 +01001/* Initializes CPU and basic hardware such as memory
2 * controllers, IRQ controller and system timer 0.
3 *
4 * (C) Copyright 2007
5 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
6 *
7 * See file CREDITS for list of people who contributed to this
8 * project.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23 * MA 02111-1307 USA
24 *
25 */
26
27#include <common.h>
28#include <asm/asi.h>
29#include <asm/leon.h>
30
31#include <config.h>
32
33DECLARE_GLOBAL_DATA_PTR;
34
35/* reset CPU (jump to 0, without reset) */
36void start(void);
37
38struct {
39 gd_t gd_area;
40 bd_t bd;
41} global_data;
42
43/*
44 * Breath some life into the CPU...
45 *
46 * Set up the memory map,
47 * initialize a bunch of registers.
48 *
49 * Run from FLASH/PROM:
50 * - until memory controller is set up, only registers avaiable
51 * - no global variables available for writing
52 * - constants avaiable
53 */
54
55void cpu_init_f(void)
56{
57 LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
58
59 /* initialize the IRQMP */
60 leon2->Interrupt_Force = 0;
61 leon2->Interrupt_Pending = 0;
62 leon2->Interrupt_Clear = 0xfffe; /* clear all old pending interrupts */
63 leon2->Interrupt_Mask = 0xfffe0000; /* mask all IRQs */
64
65 /* cache */
66
67 /* I/O port setup */
68#ifdef LEON2_IO_PORT_DIR
69 leon2->PIO_Direction = LEON2_IO_PORT_DIR;
70#endif
71#ifdef LEON2_IO_PORT_DATA
72 leon2->PIO_Data = LEON2_IO_PORT_DATA;
73#endif
74#ifdef LEON2_IO_PORT_INT
75 leon2->PIO_Interrupt = LEON2_IO_PORT_INT;
76#else
77 leon2->PIO_Interrupt = 0;
78#endif
79}
80
81void cpu_init_f2(void)
82{
83
84}
85
86/*
87 * initialize higher level parts of CPU like time base and timers
88 */
89int cpu_init_r(void)
90{
91 LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
92
93 /* initialize prescaler common to all timers to 1MHz */
94 leon2->Scaler_Counter = leon2->Scaler_Reload =
95 (((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
96
97 return (0);
98}
99
100/* Uses Timer 0 to get accurate
101 * pauses. Max 2 raised to 32 ticks
102 *
103 */
104void cpu_wait_ticks(unsigned long ticks)
105{
106 unsigned long start = get_timer(0);
107 while (get_timer(start) < ticks) ;
108}
109
110/* initiate and setup timer0 interrupt to 1MHz
111 * Return irq number for timer int or a negative number for
112 * dealing with self
113 */
114int timer_interrupt_init_cpu(void)
115{
116 LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
117
118 /* 1ms ticks */
119 leon2->Timer_Counter_1 = 0;
120 leon2->Timer_Reload_1 = 999; /* (((1000000 / 100) - 1)) */
121 leon2->Timer_Control_1 =
122 (LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS | LEON2_TIMER_CTRL_LD);
123
124 return LEON2_TIMER1_IRQNO;
125}
126
127/*
128 * This function is intended for SHORT delays only.
129 */
130unsigned long cpu_usec2ticks(unsigned long usec)
131{
132 /* timer set to 1kHz ==> 1 clk tick = 1 msec */
133 if (usec < 1000)
134 return 1;
135 return (usec / 1000);
136}
137
138unsigned long cpu_ticks2usec(unsigned long ticks)
139{
140 /* 1tick = 1usec */
141 return ticks * 1000;
142}