171 строка
4.3 KiB
C
171 строка
4.3 KiB
C
/*
|
|
* config.c - non-mmu 68360 platform initialization code
|
|
*
|
|
* Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
|
|
* Copyright (C) 1993 Hamish Macdonald
|
|
* Copyright (C) 1999 D. Jeff Dionne <jeff@uclinux.org>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <stdarg.h>
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/m68360.h>
|
|
|
|
#ifdef CONFIG_UCQUICC
|
|
#include <asm/bootstd.h>
|
|
#endif
|
|
|
|
extern void m360_cpm_reset(void);
|
|
|
|
// Mask to select if the PLL prescaler is enabled.
|
|
#define MCU_PREEN ((unsigned short)(0x0001 << 13))
|
|
|
|
#if defined(CONFIG_UCQUICC)
|
|
#define OSCILLATOR (unsigned long int)33000000
|
|
#endif
|
|
|
|
static irq_handler_t timer_interrupt;
|
|
unsigned long int system_clock;
|
|
|
|
extern QUICC *pquicc;
|
|
|
|
/* TODO DON"T Hard Code this */
|
|
/* calculate properly using the right PLL and prescaller */
|
|
// unsigned int system_clock = 33000000l;
|
|
extern unsigned long int system_clock; //In kernel setup.c
|
|
|
|
|
|
static irqreturn_t hw_tick(int irq, void *dummy)
|
|
{
|
|
/* Reset Timer1 */
|
|
/* TSTAT &= 0; */
|
|
|
|
pquicc->timer_ter1 = 0x0002; /* clear timer event */
|
|
|
|
return timer_interrupt(irq, dummy);
|
|
}
|
|
|
|
static struct irqaction m68360_timer_irq = {
|
|
.name = "timer",
|
|
.flags = IRQF_TIMER,
|
|
.handler = hw_tick,
|
|
};
|
|
|
|
void hw_timer_init(irq_handler_t handler)
|
|
{
|
|
unsigned char prescaler;
|
|
unsigned short tgcr_save;
|
|
|
|
#if 0
|
|
/* Restart mode, Enable int, 32KHz, Enable timer */
|
|
TCTL = TCTL_OM | TCTL_IRQEN | TCTL_CLKSOURCE_32KHZ | TCTL_TEN;
|
|
/* Set prescaler (Divide 32KHz by 32)*/
|
|
TPRER = 31;
|
|
/* Set compare register 32Khz / 32 / 10 = 100 */
|
|
TCMP = 10;
|
|
|
|
request_irq(IRQ_MACHSPEC | 1, timer_routine, 0, "timer", NULL);
|
|
#endif
|
|
|
|
/* General purpose quicc timers: MC68360UM p7-20 */
|
|
|
|
/* Set up timer 1 (in [1..4]) to do 100Hz */
|
|
tgcr_save = pquicc->timer_tgcr & 0xfff0;
|
|
pquicc->timer_tgcr = tgcr_save; /* stop and reset timer 1 */
|
|
/* pquicc->timer_tgcr |= 0x4444; */ /* halt timers when FREEZE (ie bdm freeze) */
|
|
|
|
prescaler = 8;
|
|
pquicc->timer_tmr1 = 0x001a | /* or=1, frr=1, iclk=01b */
|
|
(unsigned short)((prescaler - 1) << 8);
|
|
|
|
pquicc->timer_tcn1 = 0x0000; /* initial count */
|
|
/* calculate interval for 100Hz based on the _system_clock: */
|
|
pquicc->timer_trr1 = (system_clock/ prescaler) / HZ; /* reference count */
|
|
|
|
pquicc->timer_ter1 = 0x0003; /* clear timer events */
|
|
|
|
timer_interrupt = handler;
|
|
|
|
/* enable timer 1 interrupt in CIMR */
|
|
setup_irq(CPMVEC_TIMER1, &m68360_timer_irq);
|
|
|
|
/* Start timer 1: */
|
|
tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001;
|
|
pquicc->timer_tgcr = tgcr_save;
|
|
}
|
|
|
|
void BSP_reset (void)
|
|
{
|
|
local_irq_disable();
|
|
asm volatile (
|
|
"moveal #_start, %a0;\n"
|
|
"moveb #0, 0xFFFFF300;\n"
|
|
"moveal 0(%a0), %sp;\n"
|
|
"moveal 4(%a0), %a0;\n"
|
|
"jmp (%a0);\n"
|
|
);
|
|
}
|
|
|
|
unsigned char *scc1_hwaddr;
|
|
static int errno;
|
|
|
|
#if defined (CONFIG_UCQUICC)
|
|
_bsc0(char *, getserialnum)
|
|
_bsc1(unsigned char *, gethwaddr, int, a)
|
|
_bsc1(char *, getbenv, char *, a)
|
|
#endif
|
|
|
|
|
|
void __init config_BSP(char *command, int len)
|
|
{
|
|
unsigned char *p;
|
|
|
|
m360_cpm_reset();
|
|
|
|
/* Calculate the real system clock value. */
|
|
{
|
|
unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr);
|
|
if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128
|
|
{
|
|
int mf = (int)(pquicc->sim_pllcr & 0x0fff);
|
|
system_clock = (OSCILLATOR / 128) * (mf + 1);
|
|
}
|
|
else
|
|
{
|
|
int mf = (int)(pquicc->sim_pllcr & 0x0fff);
|
|
system_clock = (OSCILLATOR) * (mf + 1);
|
|
}
|
|
}
|
|
|
|
printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n");
|
|
|
|
#if defined(CONFIG_UCQUICC) && 0
|
|
printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum());
|
|
p = scc1_hwaddr = gethwaddr(0);
|
|
printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
|
|
p[0], p[1], p[2], p[3], p[4], p[5]);
|
|
|
|
p = getbenv("APPEND");
|
|
if (p)
|
|
strcpy(p,command);
|
|
else
|
|
command[0] = 0;
|
|
#else
|
|
scc1_hwaddr = "\00\01\02\03\04\05";
|
|
#endif
|
|
|
|
mach_reset = BSP_reset;
|
|
}
|