184 строки
4.5 KiB
C
184 строки
4.5 KiB
C
/*
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* config.c - non-mmu 68360 platform initialization code
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*
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* Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
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* Copyright (C) 1993 Hamish Macdonald
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* Copyright (C) 1999 D. Jeff Dionne <jeff@uclinux.org>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <stdarg.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <asm/setup.h>
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#include <asm/pgtable.h>
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#include <asm/machdep.h>
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#include <asm/m68360.h>
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#ifdef CONFIG_UCQUICC
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#include <asm/bootstd.h>
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#endif
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extern void m360_cpm_reset(void);
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// Mask to select if the PLL prescaler is enabled.
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#define MCU_PREEN ((unsigned short)(0x0001 << 13))
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#if defined(CONFIG_UCQUICC)
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#define OSCILLATOR (unsigned long int)33000000
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#endif
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static irq_handler_t timer_interrupt;
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unsigned long int system_clock;
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extern QUICC *pquicc;
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/* TODO DON"T Hard Code this */
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/* calculate properly using the right PLL and prescaller */
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// unsigned int system_clock = 33000000l;
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extern unsigned long int system_clock; //In kernel setup.c
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static irqreturn_t hw_tick(int irq, void *dummy)
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{
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/* Reset Timer1 */
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/* TSTAT &= 0; */
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pquicc->timer_ter1 = 0x0002; /* clear timer event */
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return timer_interrupt(irq, dummy);
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}
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static struct irqaction m68360_timer_irq = {
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.name = "timer",
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.flags = IRQF_TIMER,
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.handler = hw_tick,
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};
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void hw_timer_init(irq_handler_t handler)
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{
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unsigned char prescaler;
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unsigned short tgcr_save;
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#if 0
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/* Restart mode, Enable int, 32KHz, Enable timer */
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TCTL = TCTL_OM | TCTL_IRQEN | TCTL_CLKSOURCE_32KHZ | TCTL_TEN;
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/* Set prescaler (Divide 32KHz by 32)*/
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TPRER = 31;
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/* Set compare register 32Khz / 32 / 10 = 100 */
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TCMP = 10;
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request_irq(IRQ_MACHSPEC | 1, timer_routine, 0, "timer", NULL);
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#endif
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/* General purpose quicc timers: MC68360UM p7-20 */
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/* Set up timer 1 (in [1..4]) to do 100Hz */
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tgcr_save = pquicc->timer_tgcr & 0xfff0;
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pquicc->timer_tgcr = tgcr_save; /* stop and reset timer 1 */
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/* pquicc->timer_tgcr |= 0x4444; */ /* halt timers when FREEZE (ie bdm freeze) */
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prescaler = 8;
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pquicc->timer_tmr1 = 0x001a | /* or=1, frr=1, iclk=01b */
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(unsigned short)((prescaler - 1) << 8);
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pquicc->timer_tcn1 = 0x0000; /* initial count */
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/* calculate interval for 100Hz based on the _system_clock: */
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pquicc->timer_trr1 = (system_clock/ prescaler) / HZ; /* reference count */
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pquicc->timer_ter1 = 0x0003; /* clear timer events */
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timer_interrupt = handler;
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/* enable timer 1 interrupt in CIMR */
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setup_irq(CPMVEC_TIMER1, &m68360_timer_irq);
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/* Start timer 1: */
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tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001;
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pquicc->timer_tgcr = tgcr_save;
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}
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int BSP_set_clock_mmss(unsigned long nowtime)
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{
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#if 0
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short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
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tod->second1 = real_seconds / 10;
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tod->second2 = real_seconds % 10;
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tod->minute1 = real_minutes / 10;
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tod->minute2 = real_minutes % 10;
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#endif
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return 0;
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}
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void BSP_reset (void)
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{
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local_irq_disable();
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asm volatile (
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"moveal #_start, %a0;\n"
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"moveb #0, 0xFFFFF300;\n"
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"moveal 0(%a0), %sp;\n"
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"moveal 4(%a0), %a0;\n"
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"jmp (%a0);\n"
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);
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}
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unsigned char *scc1_hwaddr;
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static int errno;
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#if defined (CONFIG_UCQUICC)
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_bsc0(char *, getserialnum)
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_bsc1(unsigned char *, gethwaddr, int, a)
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_bsc1(char *, getbenv, char *, a)
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#endif
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void __init config_BSP(char *command, int len)
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{
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unsigned char *p;
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m360_cpm_reset();
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/* Calculate the real system clock value. */
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{
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unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr);
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if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128
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{
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int mf = (int)(pquicc->sim_pllcr & 0x0fff);
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system_clock = (OSCILLATOR / 128) * (mf + 1);
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}
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else
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{
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int mf = (int)(pquicc->sim_pllcr & 0x0fff);
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system_clock = (OSCILLATOR) * (mf + 1);
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}
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}
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printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n");
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#if defined(CONFIG_UCQUICC) && 0
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printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum());
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p = scc1_hwaddr = gethwaddr(0);
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printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
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p[0], p[1], p[2], p[3], p[4], p[5]);
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p = getbenv("APPEND");
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if (p)
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strcpy(p,command);
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else
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command[0] = 0;
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#else
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scc1_hwaddr = "\00\01\02\03\04\05";
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#endif
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mach_reset = BSP_reset;
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}
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