1 /* Initializes CPU and basic hardware such as memory
2 * controllers, IRQ controller and system timer 0.
5 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
7 * See file CREDITS for list of people who contributed to this
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.
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.
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,
33 DECLARE_GLOBAL_DATA_PTR;
35 /* reset CPU (jump to 0, without reset) */
44 * Breath some life into the CPU...
46 * Set up the memory map,
47 * initialize a bunch of registers.
49 * Run from FLASH/PROM:
50 * - until memory controller is set up, only registers available
51 * - no global variables available for writing
52 * - constants available
57 LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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 */
68 #ifdef LEON2_IO_PORT_DIR
69 leon2->PIO_Direction = LEON2_IO_PORT_DIR;
71 #ifdef LEON2_IO_PORT_DATA
72 leon2->PIO_Data = LEON2_IO_PORT_DATA;
74 #ifdef LEON2_IO_PORT_INT
75 leon2->PIO_Interrupt = LEON2_IO_PORT_INT;
77 leon2->PIO_Interrupt = 0;
81 void cpu_init_f2(void)
87 * initialize higher level parts of CPU like time base and timers
91 LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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;
100 /* Uses Timer 0 to get accurate
101 * pauses. Max 2 raised to 32 ticks
104 void cpu_wait_ticks(unsigned long ticks)
106 unsigned long start = get_timer(0);
107 while (get_timer(start) < ticks) ;
110 /* initiate and setup timer0 interrupt to 1MHz
111 * Return irq number for timer int or a negative number for
114 int timer_interrupt_init_cpu(void)
116 LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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);
124 return LEON2_TIMER1_IRQNO;
128 * This function is intended for SHORT delays only.
130 unsigned long cpu_usec2ticks(unsigned long usec)
132 /* timer set to 1kHz ==> 1 clk tick = 1 msec */
135 return (usec / 1000);
138 unsigned long cpu_ticks2usec(unsigned long ticks)