summaryrefslogtreecommitdiffstats
path: root/arch/m68k/bvme6000/config.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m68k/bvme6000/config.c')
-rw-r--r--arch/m68k/bvme6000/config.c380
1 files changed, 380 insertions, 0 deletions
diff --git a/arch/m68k/bvme6000/config.c b/arch/m68k/bvme6000/config.c
new file mode 100644
index 000000000000..3ffc84f9c291
--- /dev/null
+++ b/arch/m68k/bvme6000/config.c
@@ -0,0 +1,380 @@
+/*
+ * 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 <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/system.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/bvme6000hw.h>
+
+extern irqreturn_t 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 show_bvme6000_interrupts(struct seq_file *, void *);
+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, irqreturn_t (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
+extern void bvme6000_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *));
+extern unsigned long bvme6000_gettimeoffset (void);
+extern int bvme6000_hwclk (int, struct rtc_time *);
+extern int bvme6000_set_clock_mmss (unsigned long);
+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 irqreturn_t (*tick_handler)(int, void *, struct pt_regs *);
+
+
+int bvme6000_parse_bootinfo(const struct bi_record *bi)
+{
+ if (bi->tag == BI_VME_TYPE)
+ return 0;
+ else
+ return 1;
+}
+
+void bvme6000_reset(void)
+{
+ 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)
+{
+ sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
+}
+
+
+/* No hardware options on BVME6000? */
+
+static int bvme6000_get_hardware_list(char *buffer)
+{
+ *buffer = '\0';
+ return 0;
+}
+
+
+void __init config_bvme6000(void)
+{
+ volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+
+ /* Board type is only set by newer versions of vmelilo/tftplilo */
+ if (!vme_brdtype) {
+ if (m68k_cputype == CPU_68060)
+ vme_brdtype = VME_TYPE_BVME6000;
+ else
+ vme_brdtype = VME_TYPE_BVME4000;
+ }
+#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_max_dma_address = 0xffffffff;
+ mach_sched_init = bvme6000_sched_init;
+ mach_init_IRQ = bvme6000_init_IRQ;
+ mach_gettimeoffset = bvme6000_gettimeoffset;
+ mach_hwclk = bvme6000_hwclk;
+ mach_set_clock_mmss = bvme6000_set_clock_mmss;
+ mach_reset = bvme6000_reset;
+ mach_free_irq = bvme6000_free_irq;
+ mach_process_int = bvme6000_process_int;
+ mach_get_irq_list = show_bvme6000_interrupts;
+ 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 */
+
+ /* Disable snooping for Ethernet and VME accesses */
+
+ bvme_acr_addrctl = 0;
+}
+
+
+irqreturn_t 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 (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & 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 */
+ return IRQ_HANDLED;
+}
+
+
+static irqreturn_t 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 */
+
+ return 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 (irqreturn_t (*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;
+}
+
+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 rtc_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->tm_year%4;
+ rtc->bcd_tenms = 0;
+ rtc->bcd_sec = bin2bcd(t->tm_sec);
+ rtc->bcd_min = bin2bcd(t->tm_min);
+ rtc->bcd_hr = bin2bcd(t->tm_hour);
+ rtc->bcd_dom = bin2bcd(t->tm_mday);
+ rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
+ rtc->bcd_year = bin2bcd(t->tm_year%100);
+ if (t->tm_wday >= 0)
+ rtc->bcd_dow = bin2bcd(t->tm_wday+1);
+ rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
+ }
+ else
+ { /* Read.... */
+ do {
+ t->tm_sec = bcd2bin(rtc->bcd_sec);
+ t->tm_min = bcd2bin(rtc->bcd_min);
+ t->tm_hour = bcd2bin(rtc->bcd_hr);
+ t->tm_mday = bcd2bin(rtc->bcd_dom);
+ t->tm_mon = bcd2bin(rtc->bcd_mth)-1;
+ t->tm_year = bcd2bin(rtc->bcd_year);
+ if (t->tm_year < 70)
+ t->tm_year += 100;
+ t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
+ } while (t->tm_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)
+ {
+ local_irq_save(flags);
+ 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);
+ local_irq_restore(flags);
+ }
+ else
+ retval = -1;
+
+ rtc->msr = msr;
+
+ return retval;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 11:17:12 +0100