1 /* Initializes CPU and basic hardware such as memory
2 * controllers, IRQ controller and system timer 0.
4 * (C) Copyright 2007, 2015
5 * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com
7 * SPDX-License-Identifier: GPL-2.0+
17 DECLARE_GLOBAL_DATA_PTR;
20 * Breath some life into the CPU...
22 * Set up the memory map,
23 * initialize a bunch of registers.
25 * Run from FLASH/PROM:
26 * - until memory controller is set up, only registers available
27 * - no global variables available for writing
28 * - constants available
33 LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
35 /* initialize the IRQMP */
36 leon2->Interrupt_Force = 0;
37 leon2->Interrupt_Pending = 0;
38 leon2->Interrupt_Clear = 0xfffe; /* clear all old pending interrupts */
39 leon2->Interrupt_Mask = 0xfffe0000; /* mask all IRQs */
44 #ifdef LEON2_IO_PORT_DIR
45 leon2->PIO_Direction = LEON2_IO_PORT_DIR;
47 #ifdef LEON2_IO_PORT_DATA
48 leon2->PIO_Data = LEON2_IO_PORT_DATA;
50 #ifdef LEON2_IO_PORT_INT
51 leon2->PIO_Interrupt = LEON2_IO_PORT_INT;
53 leon2->PIO_Interrupt = 0;
57 leon2->Timer_Control_1 = leon2->Timer_Control_2 = 0;
60 int arch_cpu_init(void)
62 gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
63 gd->bus_clk = CONFIG_SYS_CLK_FREQ;
64 gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
70 * initialize higher level parts of CPU
77 /* initiate and setup timer0 to configured HZ. Base clock is 1MHz.
81 LEON2_regs *leon2 = (LEON2_regs *)LEON2_PREGS;
83 /* initialize prescaler common to all timers to 1MHz */
84 leon2->Scaler_Counter = leon2->Scaler_Reload =
85 (((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
87 /* SYS_HZ ticks per second */
88 leon2->Timer_Counter_1 = 0;
89 leon2->Timer_Reload_1 = (CONFIG_SYS_TIMER_RATE / CONFIG_SYS_HZ) - 1;
90 leon2->Timer_Control_1 = LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS |
93 CONFIG_SYS_TIMER_COUNTER = (void *)&leon2->Timer_Counter_1;