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kernel/linux-imx6_3.14.28/arch/m68k/mvme147/config.c 4.8 KB
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  /*
   *  arch/m68k/mvme147/config.c
   *
   *  Copyright (C) 1996 Dave Frascone [chaos@mindspring.com]
   *  Cloned from        Richard Hirst [richard@sleepie.demon.co.uk]
   *
   * Based on:
   *
   *  Copyright (C) 1993 Hamish Macdonald
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file README.legal in the main directory of this archive
   * for more details.
   */
  
  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/mm.h>
  #include <linux/tty.h>
  #include <linux/console.h>
  #include <linux/linkage.h>
  #include <linux/init.h>
  #include <linux/major.h>
  #include <linux/genhd.h>
  #include <linux/rtc.h>
  #include <linux/interrupt.h>
  
  #include <asm/bootinfo.h>
  #include <asm/bootinfo-vme.h>
  #include <asm/byteorder.h>
  #include <asm/pgtable.h>
  #include <asm/setup.h>
  #include <asm/irq.h>
  #include <asm/traps.h>
  #include <asm/rtc.h>
  #include <asm/machdep.h>
  #include <asm/mvme147hw.h>
  
  
  static void mvme147_get_model(char *model);
  extern void mvme147_sched_init(irq_handler_t handler);
  extern u32 mvme147_gettimeoffset(void);
  extern int mvme147_hwclk (int, struct rtc_time *);
  extern int mvme147_set_clock_mmss (unsigned long);
  extern void mvme147_reset (void);
  
  
  static int bcd2int (unsigned char b);
  
  /* Save tick handler routine pointer, will point to xtime_update() in
   * kernel/time/timekeeping.c, called via mvme147_process_int() */
  
  irq_handler_t tick_handler;
  
  
  int __init mvme147_parse_bootinfo(const struct bi_record *bi)
  {
  	uint16_t tag = be16_to_cpu(bi->tag);
  	if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
  		return 0;
  	else
  		return 1;
  }
  
  void mvme147_reset(void)
  {
  	printk ("\r
  
  Called mvme147_reset\r
  ");
  	m147_pcc->watchdog = 0x0a;	/* Clear timer */
  	m147_pcc->watchdog = 0xa5;	/* Enable watchdog - 100ms to reset */
  	while (1)
  		;
  }
  
  static void mvme147_get_model(char *model)
  {
  	sprintf(model, "Motorola MVME147");
  }
  
  /*
   * This function is called during kernel startup to initialize
   * the mvme147 IRQ handling routines.
   */
  
  void __init mvme147_init_IRQ(void)
  {
  	m68k_setup_user_interrupt(VEC_USER, 192);
  }
  
  void __init config_mvme147(void)
  {
  	mach_max_dma_address	= 0x01000000;
  	mach_sched_init		= mvme147_sched_init;
  	mach_init_IRQ		= mvme147_init_IRQ;
  	arch_gettimeoffset	= mvme147_gettimeoffset;
  	mach_hwclk		= mvme147_hwclk;
  	mach_set_clock_mmss	= mvme147_set_clock_mmss;
  	mach_reset		= mvme147_reset;
  	mach_get_model		= mvme147_get_model;
  
  	/* Board type is only set by newer versions of vmelilo/tftplilo */
  	if (!vme_brdtype)
  		vme_brdtype = VME_TYPE_MVME147;
  }
  
  
  /* Using pcc tick timer 1 */
  
  static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
  {
  	m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
  	m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
  	return tick_handler(irq, dev_id);
  }
  
  
  void mvme147_sched_init (irq_handler_t timer_routine)
  {
  	tick_handler = timer_routine;
  	if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL))
  		pr_err("Couldn't register timer interrupt
  ");
  
  	/* Init the clock with a value */
  	/* our clock goes off every 6.25us */
  	m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
  	m147_pcc->t1_cntrl = 0x0;	/* clear timer */
  	m147_pcc->t1_cntrl = 0x3;	/* start timer */
  	m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
  	m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
  }
  
  /* This is always executed with interrupts disabled.  */
  /* XXX There are race hazards in this code XXX */
  u32 mvme147_gettimeoffset(void)
  {
  	volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
  	unsigned short n;
  
  	n = *cp;
  	while (n != *cp)
  		n = *cp;
  
  	n -= PCC_TIMER_PRELOAD;
  	return ((unsigned long)n * 25 / 4) * 1000;
  }
  
  static int bcd2int (unsigned char b)
  {
  	return ((b>>4)*10 + (b&15));
  }
  
  int mvme147_hwclk(int op, struct rtc_time *t)
  {
  #warning check me!
  	if (!op) {
  		m147_rtc->ctrl = RTC_READ;
  		t->tm_year = bcd2int (m147_rtc->bcd_year);
  		t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
  		t->tm_mday = bcd2int (m147_rtc->bcd_dom);
  		t->tm_hour = bcd2int (m147_rtc->bcd_hr);
  		t->tm_min  = bcd2int (m147_rtc->bcd_min);
  		t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
  		m147_rtc->ctrl = 0;
  	}
  	return 0;
  }
  
  int mvme147_set_clock_mmss (unsigned long nowtime)
  {
  	return 0;
  }
  
  /*-------------------  Serial console stuff ------------------------*/
  
  static void scc_delay (void)
  {
  	int n;
  	volatile int trash;
  
  	for (n = 0; n < 20; n++)
  		trash = n;
  }
  
  static void scc_write (char ch)
  {
  	volatile char *p = (volatile char *)M147_SCC_A_ADDR;
  
  	do {
  		scc_delay();
  	}
  	while (!(*p & 4));
  	scc_delay();
  	*p = 8;
  	scc_delay();
  	*p = ch;
  }
  
  
  void m147_scc_write (struct console *co, const char *str, unsigned count)
  {
  	unsigned long flags;
  
  	local_irq_save(flags);
  
  	while (count--)
  	{
  		if (*str == '
  ')
  			scc_write ('\r');
  		scc_write (*str++);
  	}
  	local_irq_restore(flags);
  }
  
  void mvme147_init_console_port (struct console *co, int cflag)
  {
  	co->write    = m147_scc_write;
  }