patch-2.1.106 linux/arch/m68k/bvme6000/config.c

• Lines: 454
• Date: Sat Jun 13 13:14:31 1998
• Orig file: v2.1.105/linux/arch/m68k/bvme6000/config.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.105/linux/arch/m68k/bvme6000/config.c linux/arch/m68k/bvme6000/config.c
@@ -0,0 +1,453 @@
+/*
+ *  arch/m68k/bvme6000/config.c
+ *
+ *  Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
+ *
+ * Based on:
+ *
+ *  linux/amiga/config.c
+ *
+ *  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 <stdarg.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/kd.h>
+#include <linux/tty.h>
+#include <linux/console.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <linux/major.h>
+
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/bvme6000hw.h>
+
+extern void bvme6000_process_int (int level, struct pt_regs *regs);
+extern void bvme6000_init_IRQ (void);
+extern void bvme6000_free_irq (unsigned int, void *);
+extern int  bvme6000_get_irq_list (char *);
+extern void bvme6000_enable_irq (unsigned int);
+extern void bvme6000_disable_irq (unsigned int);
+static void bvme6000_get_model(char *model);
+static int  bvme6000_get_hardware_list(char *buffer);
+extern int  bvme6000_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
+extern void bvme6000_sched_init(void (*handler)(int, void *, struct pt_regs *));
+extern int  bvme6000_keyb_init(void);
+extern int  bvme6000_kbdrate (struct kbd_repeat *);
+extern unsigned long bvme6000_gettimeoffset (void);
+extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour,
+                           int *min, int *sec);
+extern int bvme6000_hwclk (int, struct hwclk_time *);
+extern int bvme6000_set_clock_mmss (unsigned long);
+extern void bvme6000_check_partition (struct gendisk *hd, unsigned int dev);
+extern void bvme6000_mksound( unsigned int count, unsigned int ticks );
+extern void bvme6000_reset (void);
+extern void bvme6000_waitbut(void);
+void bvme6000_set_vectors (void);
+
+static unsigned char bcd2bin (unsigned char b);
+static unsigned char bin2bcd (unsigned char b);
+
+/* Save tick handler routine pointer, will point to do_timer() in
+ * kernel/sched.c, called via bvme6000_process_int() */
+
+static void (*tick_handler)(int, void *, struct pt_regs *);
+
+int bvme6000_kbdrate (struct kbd_repeat *k)
+{
+	return 0;
+}
+
+void bvme6000_mksound( unsigned int count, unsigned int ticks )
+{
+}
+
+void bvme6000_reset()
+{
+	volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+
+	printk ("\r\n\nCalled bvme6000_reset\r\n"
+			"\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
+	/* The string of returns is to delay the reset until the whole
+	 * message is output. */
+	/* Enable the watchdog, via PIT port C bit 4 */
+
+	pit->pcddr	|= 0x10;	/* WDOG enable */
+
+	while(1)
+		;
+}
+
+static void bvme6000_get_model(char *model)
+{
+    /* XXX Need to detect if BVME4000 or BVME6000 */
+    sprintf(model, "BVME6000");
+}
+
+
+/* No hardware options on BVME6000? */
+
+static int bvme6000_get_hardware_list(char *buffer)
+{
+    *buffer = '\0';
+    return 0;
+}
+
+
+__initfunc(void config_bvme6000(void))
+{
+    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+
+#if 0
+    /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
+     * debugger.  Note trap_init() will splat the abort vector, but
+     * bvme6000_init_IRQ() will put it back again.  Hopefully. */
+
+    bvme6000_set_vectors();
+#endif
+
+    mach_sched_init      = bvme6000_sched_init;
+    mach_keyb_init       = bvme6000_keyb_init;
+    mach_kbdrate         = bvme6000_kbdrate;
+    mach_init_IRQ        = bvme6000_init_IRQ;
+    mach_gettimeoffset   = bvme6000_gettimeoffset;
+    mach_gettod  	 = bvme6000_gettod;
+    mach_hwclk           = bvme6000_hwclk;
+    mach_set_clock_mmss	 = bvme6000_set_clock_mmss;
+/*  mach_mksound         = bvme6000_mksound; */
+    mach_reset		 = bvme6000_reset;
+    mach_free_irq	 = bvme6000_free_irq;
+    mach_process_int	 = bvme6000_process_int;
+    mach_get_irq_list	 = bvme6000_get_irq_list;
+    mach_request_irq	 = bvme6000_request_irq;
+    enable_irq		 = bvme6000_enable_irq;
+    disable_irq          = bvme6000_disable_irq;
+    mach_get_model       = bvme6000_get_model;
+    mach_get_hardware_list = bvme6000_get_hardware_list;
+
+    printk ("Board is %sconfigured as a System Controller\n",
+		*config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
+
+    /* Now do the PIT configuration */
+
+    pit->pgcr	= 0x00;	/* Unidirectional 8 bit, no handshake for now */
+    pit->psrr	= 0x18;	/* PIACK and PIRQ fucntions enabled */
+    pit->pacr	= 0x00;	/* Sub Mode 00, H2 i/p, no DMA */
+    pit->padr	= 0x00;	/* Just to be tidy! */
+    pit->paddr	= 0x00;	/* All inputs for now (safest) */
+    pit->pbcr	= 0x80;	/* Sub Mode 1x, H4 i/p, no DMA */
+    pit->pbdr	= 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
+			/* PRI, SYSCON?, Level3, SCC clks from xtal */
+    pit->pbddr	= 0xf3;	/* Mostly outputs */
+    pit->pcdr	= 0x01;	/* PA transceiver disabled */
+    pit->pcddr	= 0x03;	/* WDOG disable */
+}
+
+
+void bvme6000_abort_int (int irq, void *dev_id, struct pt_regs *fp)
+{
+        unsigned long *new = (unsigned long *)vectors;
+        unsigned long *old = (unsigned long *)0xf8000000;;
+
+        /* Wait for button release */
+	while (*config_reg_ptr & BVME_ABORT_STATUS)
+		;
+
+        *(new+4) = *(old+4);            /* Illegal instruction */
+        *(new+9) = *(old+9);            /* Trace */
+        *(new+47) = *(old+47);          /* Trap #15 */
+        *(new+0x1f) = *(old+0x1f);      /* ABORT switch */
+}
+
+
+static void bvme6000_timer_int (int irq, void *dev_id, struct pt_regs *fp)
+{
+    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+    unsigned char msr = rtc->msr & 0xc0;
+
+    rtc->msr = msr | 0x20;		/* Ack the interrupt */
+
+    tick_handler(irq, dev_id, fp);
+}
+
+/*
+ * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
+ * (40000 x 125ns).  It will interrupt every 10ms, when T1 goes low.
+ * So, when reading the elapsed time, you should read timer1,
+ * subtract it from 39999, and then add 40000 if T1 is high.
+ * That gives you the number of 125ns ticks in to the 10ms period,
+ * so divide by 8 to get the microsecond result.
+ */
+
+void bvme6000_sched_init (void (*timer_routine)(int, void *, struct pt_regs *))
+{
+    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+    unsigned char msr = rtc->msr & 0xc0;
+
+    rtc->msr = 0;	/* Ensure timer registers accessible */
+
+    tick_handler = timer_routine;
+    if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
+				"timer", bvme6000_timer_int))
+	panic ("Couldn't register timer int");
+
+    rtc->t1cr_omr = 0x04;	/* Mode 2, ext clk */
+    rtc->t1msb = 39999 >> 8;
+    rtc->t1lsb = 39999 & 0xff;
+    rtc->irr_icr1 &= 0xef;	/* Route timer 1 to INTR pin */
+    rtc->msr = 0x40;		/* Access int.cntrl, etc */
+    rtc->pfr_icr0 = 0x80;	/* Just timer 1 ints enabled */
+    rtc->irr_icr1 = 0;
+    rtc->t1cr_omr = 0x0a;	/* INTR+T1 active lo, push-pull */
+    rtc->t0cr_rtmr &= 0xdf;	/* Stop timers in standby */
+    rtc->msr = 0;		/* Access timer 1 control */
+    rtc->t1cr_omr = 0x05;	/* Mode 2, ext clk, GO */
+
+    rtc->msr = msr;
+
+    if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
+				"abort", bvme6000_abort_int))
+	panic ("Couldn't register abort int");
+}
+
+
+/* This is always executed with interrupts disabled.  */
+
+/*
+ * NOTE:  Don't accept any readings within 5us of rollover, as
+ * the T1INT bit may be a little slow getting set.  There is also
+ * a fault in the chip, meaning that reads may produce invalid
+ * results...
+ */
+
+unsigned long bvme6000_gettimeoffset (void)
+{
+    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+    unsigned char msr = rtc->msr & 0xc0;
+    unsigned char t1int, t1op;
+    unsigned long v = 800000, ov;
+
+    rtc->msr = 0;	/* Ensure timer registers accessible */
+
+    do {
+	ov = v;
+	t1int = rtc->msr & 0x20;
+	t1op  = pit->pcdr & 0x04;
+	rtc->t1cr_omr |= 0x40;		/* Latch timer1 */
+	v = rtc->t1msb << 8;		/* Read timer1 */
+	v |= rtc->t1lsb;		/* Read timer1 */
+    } while (t1int != (rtc->msr & 0x20) ||
+		t1op != (pit->pcdr & 0x04) ||
+			abs(ov-v) > 80 ||
+				v > 39960);
+
+    v = 39999 - v;
+    if (!t1op)				/* If in second half cycle.. */
+	v += 40000;
+    v /= 8;				/* Convert ticks to microseconds */
+    if (t1int)
+	v += 10000;			/* Int pending, + 10ms */
+    rtc->msr = msr;
+
+    return v;
+}
+
+extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour,
+                           int *min, int *sec)
+{
+	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+	unsigned char msr = rtc->msr & 0xc0;
+
+	rtc->msr = 0;		/* Ensure clock accessible */
+
+	do {	/* Loop until we get a reading with a stable seconds field */
+		*sec = bcd2bin (rtc->bcd_sec);
+		*min = bcd2bin (rtc->bcd_min);
+		*hour = bcd2bin (rtc->bcd_hr);
+		*day = bcd2bin (rtc->bcd_dom);
+		*mon = bcd2bin (rtc->bcd_mth);
+		*year = bcd2bin (rtc->bcd_year);
+	} while (bcd2bin (rtc->bcd_sec) != *sec);
+
+	rtc->msr = msr;
+}
+
+static unsigned char bcd2bin (unsigned char b)
+{
+	return ((b>>4)*10 + (b&15));
+}
+
+static unsigned char bin2bcd (unsigned char b)
+{
+	return (((b/10)*16) + (b%10));
+}
+
+
+/*
+ * Looks like op is non-zero for setting the clock, and zero for
+ * reading the clock.
+ *
+ *  struct hwclk_time {
+ *         unsigned        sec;       0..59
+ *         unsigned        min;       0..59
+ *         unsigned        hour;      0..23
+ *         unsigned        day;       1..31
+ *         unsigned        mon;       0..11
+ *         unsigned        year;      00...
+ *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
+ * };
+ */
+
+int bvme6000_hwclk(int op, struct hwclk_time *t)
+{
+	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+	unsigned char msr = rtc->msr & 0xc0;
+
+	rtc->msr = 0x40;	/* Ensure clock and real-time-mode-register
+				 * are accessible */
+	if (op)
+	{	/* Write.... */
+		rtc->t0cr_rtmr = t->year%4;
+		rtc->bcd_tenms = 0;
+		rtc->bcd_sec = bin2bcd(t->sec);
+		rtc->bcd_min = bin2bcd(t->min);
+		rtc->bcd_hr  = bin2bcd(t->hour);
+		rtc->bcd_dom = bin2bcd(t->day);
+		rtc->bcd_mth = bin2bcd(t->mon + 1);
+		rtc->bcd_year = bin2bcd(t->year%100);
+		if (t->wday >= 0)
+			rtc->bcd_dow = bin2bcd(t->wday+1);
+		rtc->t0cr_rtmr = t->year%4 | 0x08;
+	}
+	else
+	{	/* Read....  */
+		do {
+			t->sec =  bcd2bin(rtc->bcd_sec);
+			t->min =  bcd2bin(rtc->bcd_min);
+			t->hour = bcd2bin(rtc->bcd_hr);
+			t->day =  bcd2bin(rtc->bcd_dom);
+			t->mon =  bcd2bin(rtc->bcd_mth)-1;
+			t->year = bcd2bin(rtc->bcd_year);
+			if (t->year < 70)
+				t->year += 100;
+			t->wday = bcd2bin(rtc->bcd_dow)-1;
+		} while (t->sec != bcd2bin(rtc->bcd_sec));
+	}
+
+	rtc->msr = msr;
+
+	return 0;
+}
+
+/*
+ * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
+ * clock is out by > 30 minutes.  Logic lifted from atari code.
+ * Algorithm is to wait for the 10ms register to change, and then to
+ * wait a short while, and then set it.
+ */
+
+int bvme6000_set_clock_mmss (unsigned long nowtime)
+{
+	int retval = 0;
+	short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
+	unsigned char rtc_minutes, rtc_tenms;
+	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+	unsigned char msr = rtc->msr & 0xc0;
+	unsigned long flags;
+	volatile int i;
+
+	rtc->msr = 0;		/* Ensure clock accessible */
+	rtc_minutes = bcd2bin (rtc->bcd_min);
+
+	if ((rtc_minutes < real_minutes
+		? real_minutes - rtc_minutes
+			: rtc_minutes - real_minutes) < 30)
+	{
+		save_flags(flags);
+		cli();
+		rtc_tenms = rtc->bcd_tenms;
+		while (rtc_tenms == rtc->bcd_tenms)
+			;
+		for (i = 0; i < 1000; i++)
+			;
+		rtc->bcd_min = bin2bcd(real_minutes);
+		rtc->bcd_sec = bin2bcd(real_seconds);
+		restore_flags(flags);
+	}
+	else
+		retval = -1;
+
+	rtc->msr = msr;
+
+	return retval;
+}
+
+
+int bvme6000_keyb_init (void)
+{
+	return 0;
+}
+
+/*-------------------  Serial console stuff ------------------------*/
+
+static void bvme_scc_write(struct console *co, const char *str, unsigned cnt);
+
+
+void bvme6000_init_console_port (struct console *co, int cflag)
+{
+        co->write = bvme_scc_write;
+}
+
+
+static void scc_delay (void)
+{
+        int n;
+        char i;
+
+        for (n = 0; n < 20; n++)
+                i = *(volatile char *)0;
+}
+
+static void scc_write (char ch)
+{
+        volatile char *p = (volatile char *)BVME_SCC_A_ADDR;
+
+        do {
+                scc_delay();
+        }
+        while (!(*p & 4));
+        scc_delay();
+        *p = 8;
+        scc_delay();
+        *p = ch;
+}
+
+
+static void bvme_scc_write (struct console *co, const char *str, unsigned count)
+{
+        unsigned long   flags;
+
+        save_flags(flags);
+        cli();
+
+        while (count--)
+        {
+                if (*str == '\n')
+                        scc_write ('\r');
+                scc_write (*str++);
+        }
+        restore_flags(flags);
+}
+