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-rw-r--r--arch/m68k/bvme6000/Makefile6
-rw-r--r--arch/m68k/bvme6000/config.c325
-rw-r--r--arch/m68k/bvme6000/rtc.c175
3 files changed, 506 insertions, 0 deletions
diff --git a/arch/m68k/bvme6000/Makefile b/arch/m68k/bvme6000/Makefile
new file mode 100644
index 000000000..41bd4fad3
--- /dev/null
+++ b/arch/m68k/bvme6000/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for Linux arch/m68k/bvme6000 source directory
+#
+
+obj-y := config.o rtc.o
diff --git a/arch/m68k/bvme6000/config.c b/arch/m68k/bvme6000/config.c
new file mode 100644
index 000000000..3a1d90e39
--- /dev/null
+++ b/arch/m68k/bvme6000/config.c
@@ -0,0 +1,325 @@
+/*
+ * 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/clocksource.h>
+#include <linux/console.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <linux/major.h>
+#include <linux/rtc.h>
+#include <linux/interrupt.h>
+#include <linux/bcd.h>
+
+#include <asm/bootinfo.h>
+#include <asm/bootinfo-vme.h>
+#include <asm/byteorder.h>
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/bvme6000hw.h>
+#include <asm/config.h>
+
+static void bvme6000_get_model(char *model);
+extern void bvme6000_sched_init(void);
+extern int bvme6000_hwclk (int, struct rtc_time *);
+extern void bvme6000_reset (void);
+void bvme6000_set_vectors (void);
+
+
+int __init bvme6000_parse_bootinfo(const struct bi_record *bi)
+{
+ if (be16_to_cpu(bi->tag) == BI_VME_TYPE)
+ return 0;
+ else
+ return 1;
+}
+
+void bvme6000_reset(void)
+{
+ volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+
+ pr_info("\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);
+}
+
+/*
+ * This function is called during kernel startup to initialize
+ * the bvme6000 IRQ handling routines.
+ */
+static void __init bvme6000_init_IRQ(void)
+{
+ m68k_setup_user_interrupt(VEC_USER, 192);
+}
+
+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_sched_init = bvme6000_sched_init;
+ mach_init_IRQ = bvme6000_init_IRQ;
+ mach_hwclk = bvme6000_hwclk;
+ mach_reset = bvme6000_reset;
+ mach_get_model = bvme6000_get_model;
+
+ pr_info("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 functions 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)
+{
+ 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 u64 bvme6000_read_clk(struct clocksource *cs);
+
+static struct clocksource bvme6000_clk = {
+ .name = "rtc",
+ .rating = 250,
+ .read = bvme6000_read_clk,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u32 clk_total, clk_offset;
+
+#define RTC_TIMER_CLOCK_FREQ 8000000
+#define RTC_TIMER_CYCLES (RTC_TIMER_CLOCK_FREQ / HZ)
+#define RTC_TIMER_COUNT ((RTC_TIMER_CYCLES / 2) - 1)
+
+static irqreturn_t bvme6000_timer_int (int irq, void *dev_id)
+{
+ unsigned long flags;
+ volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+ unsigned char msr;
+
+ local_irq_save(flags);
+ msr = rtc->msr & 0xc0;
+ rtc->msr = msr | 0x20; /* Ack the interrupt */
+ clk_total += RTC_TIMER_CYCLES;
+ clk_offset = 0;
+ legacy_timer_tick(1);
+ local_irq_restore(flags);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * 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)
+{
+ volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+ unsigned char msr = rtc->msr & 0xc0;
+
+ rtc->msr = 0; /* Ensure timer registers accessible */
+
+ if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, IRQF_TIMER, "timer",
+ NULL))
+ panic ("Couldn't register timer int");
+
+ rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */
+ rtc->t1msb = RTC_TIMER_COUNT >> 8;
+ rtc->t1lsb = RTC_TIMER_COUNT & 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;
+
+ clocksource_register_hz(&bvme6000_clk, RTC_TIMER_CLOCK_FREQ);
+
+ if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
+ "abort", bvme6000_abort_int))
+ panic ("Couldn't register abort int");
+}
+
+
+/*
+ * 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...
+ */
+
+static u64 bvme6000_read_clk(struct clocksource *cs)
+{
+ unsigned long flags;
+ volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+ volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+ unsigned char msr, msb;
+ unsigned char t1int, t1op;
+ u32 v = 800000, ov;
+
+ local_irq_save(flags);
+
+ msr = rtc->msr & 0xc0;
+ rtc->msr = 0; /* Ensure timer registers accessible */
+
+ do {
+ ov = v;
+ t1int = rtc->msr & 0x20;
+ t1op = pit->pcdr & 0x04;
+ rtc->t1cr_omr |= 0x40; /* Latch timer1 */
+ msb = rtc->t1msb; /* Read timer1 */
+ v = (msb << 8) | rtc->t1lsb; /* Read timer1 */
+ } while (t1int != (rtc->msr & 0x20) ||
+ t1op != (pit->pcdr & 0x04) ||
+ abs(ov-v) > 80 ||
+ v > RTC_TIMER_COUNT - (RTC_TIMER_COUNT / 100));
+
+ v = RTC_TIMER_COUNT - v;
+ if (!t1op) /* If in second half cycle.. */
+ v += RTC_TIMER_CYCLES / 2;
+ if (msb > 0 && t1int)
+ clk_offset = RTC_TIMER_CYCLES;
+ rtc->msr = msr;
+
+ v += clk_offset + clk_total;
+
+ local_irq_restore(flags);
+
+ return v;
+}
+
+/*
+ * 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;
+}
diff --git a/arch/m68k/bvme6000/rtc.c b/arch/m68k/bvme6000/rtc.c
new file mode 100644
index 000000000..b43eeef09
--- /dev/null
+++ b/arch/m68k/bvme6000/rtc.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Real Time Clock interface for Linux on the BVME6000
+ *
+ * Based on the PC driver by Paul Gortmaker.
+ */
+
+#define RTC_VERSION "1.00"
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/ioport.h>
+#include <linux/capability.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/module.h>
+#include <linux/rtc.h> /* For struct rtc_time and ioctls, etc */
+#include <linux/bcd.h>
+#include <asm/bvme6000hw.h>
+
+#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <asm/setup.h>
+
+/*
+ * We sponge a minor off of the misc major. No need slurping
+ * up another valuable major dev number for this. If you add
+ * an ioctl, make sure you don't conflict with SPARC's RTC
+ * ioctls.
+ */
+
+static unsigned char days_in_mo[] =
+{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+static atomic_t rtc_status = ATOMIC_INIT(1);
+
+static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+ unsigned char msr;
+ unsigned long flags;
+ struct rtc_time wtime;
+ void __user *argp = (void __user *)arg;
+
+ switch (cmd) {
+ case RTC_RD_TIME: /* Read the time/date from RTC */
+ {
+ local_irq_save(flags);
+ /* Ensure clock and real-time-mode-register are accessible */
+ msr = rtc->msr & 0xc0;
+ rtc->msr = 0x40;
+ memset(&wtime, 0, sizeof(struct rtc_time));
+ do {
+ wtime.tm_sec = bcd2bin(rtc->bcd_sec);
+ wtime.tm_min = bcd2bin(rtc->bcd_min);
+ wtime.tm_hour = bcd2bin(rtc->bcd_hr);
+ wtime.tm_mday = bcd2bin(rtc->bcd_dom);
+ wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1;
+ wtime.tm_year = bcd2bin(rtc->bcd_year);
+ if (wtime.tm_year < 70)
+ wtime.tm_year += 100;
+ wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
+ } while (wtime.tm_sec != bcd2bin(rtc->bcd_sec));
+ rtc->msr = msr;
+ local_irq_restore(flags);
+ return copy_to_user(argp, &wtime, sizeof wtime) ?
+ -EFAULT : 0;
+ }
+ case RTC_SET_TIME: /* Set the RTC */
+ {
+ struct rtc_time rtc_tm;
+ unsigned char mon, day, hrs, min, sec, leap_yr;
+ unsigned int yrs;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
+ return -EFAULT;
+
+ yrs = rtc_tm.tm_year;
+ if (yrs < 1900)
+ yrs += 1900;
+ mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
+ day = rtc_tm.tm_mday;
+ hrs = rtc_tm.tm_hour;
+ min = rtc_tm.tm_min;
+ sec = rtc_tm.tm_sec;
+
+ leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
+
+ if ((mon > 12) || (mon < 1) || (day == 0))
+ return -EINVAL;
+
+ if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
+ return -EINVAL;
+
+ if ((hrs >= 24) || (min >= 60) || (sec >= 60))
+ return -EINVAL;
+
+ if (yrs >= 2070)
+ return -EINVAL;
+
+ local_irq_save(flags);
+ /* Ensure clock and real-time-mode-register are accessible */
+ msr = rtc->msr & 0xc0;
+ rtc->msr = 0x40;
+
+ rtc->t0cr_rtmr = yrs%4;
+ rtc->bcd_tenms = 0;
+ rtc->bcd_sec = bin2bcd(sec);
+ rtc->bcd_min = bin2bcd(min);
+ rtc->bcd_hr = bin2bcd(hrs);
+ rtc->bcd_dom = bin2bcd(day);
+ rtc->bcd_mth = bin2bcd(mon);
+ rtc->bcd_year = bin2bcd(yrs%100);
+ if (rtc_tm.tm_wday >= 0)
+ rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1);
+ rtc->t0cr_rtmr = yrs%4 | 0x08;
+
+ rtc->msr = msr;
+ local_irq_restore(flags);
+ return 0;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+/*
+ * We enforce only one user at a time here with the open/close.
+ */
+static int rtc_open(struct inode *inode, struct file *file)
+{
+ if (!atomic_dec_and_test(&rtc_status)) {
+ atomic_inc(&rtc_status);
+ return -EBUSY;
+ }
+ return 0;
+}
+
+static int rtc_release(struct inode *inode, struct file *file)
+{
+ atomic_inc(&rtc_status);
+ return 0;
+}
+
+/*
+ * The various file operations we support.
+ */
+
+static const struct file_operations rtc_fops = {
+ .unlocked_ioctl = rtc_ioctl,
+ .open = rtc_open,
+ .release = rtc_release,
+ .llseek = noop_llseek,
+};
+
+static struct miscdevice rtc_dev = {
+ .minor = RTC_MINOR,
+ .name = "rtc",
+ .fops = &rtc_fops
+};
+
+static int __init rtc_DP8570A_init(void)
+{
+ if (!MACH_IS_BVME6000)
+ return -ENODEV;
+
+ pr_info("DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
+ return misc_register(&rtc_dev);
+}
+module_init(rtc_DP8570A_init);
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