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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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
*/
#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 <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/mvme147hw.h>
#include <asm/config.h>
#include "mvme147.h"
static void mvme147_get_model(char *model);
static void __init mvme147_sched_init(void);
extern int mvme147_hwclk (int, struct rtc_time *);
extern void mvme147_reset (void);
static int bcd2int (unsigned char b);
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)
{
pr_info("\r\n\nCalled mvme147_reset\r\n");
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.
*/
static void __init mvme147_init_IRQ(void)
{
m68k_setup_user_interrupt(VEC_USER, 192);
}
void __init config_mvme147(void)
{
mach_sched_init = mvme147_sched_init;
mach_init_IRQ = mvme147_init_IRQ;
mach_hwclk = mvme147_hwclk;
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;
}
static u64 mvme147_read_clk(struct clocksource *cs);
static struct clocksource mvme147_clk = {
.name = "pcc",
.rating = 250,
.read = mvme147_read_clk,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static u32 clk_total;
#define PCC_TIMER_CLOCK_FREQ 160000
#define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ)
#define PCC_TIMER_PRELOAD (0x10000 - PCC_TIMER_CYCLES)
/* Using pcc tick timer 1 */
static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
{
unsigned long flags;
local_irq_save(flags);
m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
PCC_TIMER_TIC_EN;
m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
PCC_LEVEL_TIMER1;
clk_total += PCC_TIMER_CYCLES;
legacy_timer_tick(1);
local_irq_restore(flags);
return IRQ_HANDLED;
}
static void __init mvme147_sched_init(void)
{
if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
"timer 1", NULL))
pr_err("Couldn't register timer interrupt\n");
/* Init the clock with a value */
/* The clock counter increments until 0xFFFF then reloads */
m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
PCC_TIMER_TIC_EN;
m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
PCC_LEVEL_TIMER1;
clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
}
static u64 mvme147_read_clk(struct clocksource *cs)
{
unsigned long flags;
u8 overflow, tmp;
u16 count;
u32 ticks;
local_irq_save(flags);
tmp = m147_pcc->t1_cntrl >> 4;
count = m147_pcc->t1_count;
overflow = m147_pcc->t1_cntrl >> 4;
if (overflow != tmp)
count = m147_pcc->t1_count;
count -= PCC_TIMER_PRELOAD;
ticks = count + overflow * PCC_TIMER_CYCLES;
ticks += clk_total;
local_irq_restore(flags);
return ticks;
}
static int bcd2int (unsigned char b)
{
return ((b>>4)*10 + (b&15));
}
int mvme147_hwclk(int op, struct rtc_time *t)
{
if (!op) {
m147_rtc->ctrl = RTC_READ;
t->tm_year = bcd2int (m147_rtc->bcd_year);
t->tm_mon = bcd2int(m147_rtc->bcd_mth) - 1;
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;
if (t->tm_year < 70)
t->tm_year += 100;
} else {
/* FIXME Setting the time is not yet supported */
return -EOPNOTSUPP;
}
return 0;
}
static void scc_delay(void)
{
__asm__ __volatile__ ("nop; nop;");
}
static void scc_write(char ch)
{
do {
scc_delay();
} while (!(in_8(M147_SCC_A_ADDR) & BIT(2)));
scc_delay();
out_8(M147_SCC_A_ADDR, 8);
scc_delay();
out_8(M147_SCC_A_ADDR, ch);
}
void mvme147_scc_write(struct console *co, const char *str, unsigned int count)
{
unsigned long flags;
local_irq_save(flags);
while (count--) {
if (*str == '\n')
scc_write('\r');
scc_write(*str++);
}
local_irq_restore(flags);
}
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