cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

config.c (4530B)

      1/*
      2 *  arch/m68k/mvme147/config.c
      3 *
      4 *  Copyright (C) 1996 Dave Frascone [chaos@mindspring.com]
      5 *  Cloned from        Richard Hirst [richard@sleepie.demon.co.uk]
      6 *
      7 * Based on:
      8 *
      9 *  Copyright (C) 1993 Hamish Macdonald
     10 *
     11 * This file is subject to the terms and conditions of the GNU General Public
     12 * License.  See the file README.legal in the main directory of this archive
     13 * for more details.
     14 */
     15
     16#include <linux/types.h>
     17#include <linux/kernel.h>
     18#include <linux/mm.h>
     19#include <linux/tty.h>
     20#include <linux/clocksource.h>
     21#include <linux/console.h>
     22#include <linux/linkage.h>
     23#include <linux/init.h>
     24#include <linux/major.h>
     25#include <linux/rtc.h>
     26#include <linux/interrupt.h>
     27
     28#include <asm/bootinfo.h>
     29#include <asm/bootinfo-vme.h>
     30#include <asm/byteorder.h>
     31#include <asm/setup.h>
     32#include <asm/irq.h>
     33#include <asm/traps.h>
     34#include <asm/machdep.h>
     35#include <asm/mvme147hw.h>
     36#include <asm/config.h>
     37
     38
     39static void mvme147_get_model(char *model);
     40extern void mvme147_sched_init(void);
     41extern int mvme147_hwclk (int, struct rtc_time *);
     42extern void mvme147_reset (void);
     43
     44
     45static int bcd2int (unsigned char b);
     46
     47
     48int __init mvme147_parse_bootinfo(const struct bi_record *bi)
     49{
     50	uint16_t tag = be16_to_cpu(bi->tag);
     51	if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
     52		return 0;
     53	else
     54		return 1;
     55}
     56
     57void mvme147_reset(void)
     58{
     59	pr_info("\r\n\nCalled mvme147_reset\r\n");
     60	m147_pcc->watchdog = 0x0a;	/* Clear timer */
     61	m147_pcc->watchdog = 0xa5;	/* Enable watchdog - 100ms to reset */
     62	while (1)
     63		;
     64}
     65
     66static void mvme147_get_model(char *model)
     67{
     68	sprintf(model, "Motorola MVME147");
     69}
     70
     71/*
     72 * This function is called during kernel startup to initialize
     73 * the mvme147 IRQ handling routines.
     74 */
     75
     76void __init mvme147_init_IRQ(void)
     77{
     78	m68k_setup_user_interrupt(VEC_USER, 192);
     79}
     80
     81void __init config_mvme147(void)
     82{
     83	mach_sched_init		= mvme147_sched_init;
     84	mach_init_IRQ		= mvme147_init_IRQ;
     85	mach_hwclk		= mvme147_hwclk;
     86	mach_reset		= mvme147_reset;
     87	mach_get_model		= mvme147_get_model;
     88
     89	/* Board type is only set by newer versions of vmelilo/tftplilo */
     90	if (!vme_brdtype)
     91		vme_brdtype = VME_TYPE_MVME147;
     92}
     93
     94static u64 mvme147_read_clk(struct clocksource *cs);
     95
     96static struct clocksource mvme147_clk = {
     97	.name   = "pcc",
     98	.rating = 250,
     99	.read   = mvme147_read_clk,
    100	.mask   = CLOCKSOURCE_MASK(32),
    101	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,
    102};
    103
    104static u32 clk_total;
    105
    106#define PCC_TIMER_CLOCK_FREQ 160000
    107#define PCC_TIMER_CYCLES     (PCC_TIMER_CLOCK_FREQ / HZ)
    108#define PCC_TIMER_PRELOAD    (0x10000 - PCC_TIMER_CYCLES)
    109
    110/* Using pcc tick timer 1 */
    111
    112static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
    113{
    114	unsigned long flags;
    115
    116	local_irq_save(flags);
    117	m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
    118			     PCC_TIMER_TIC_EN;
    119	m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
    120				 PCC_LEVEL_TIMER1;
    121	clk_total += PCC_TIMER_CYCLES;
    122	legacy_timer_tick(1);
    123	local_irq_restore(flags);
    124
    125	return IRQ_HANDLED;
    126}
    127
    128
    129void mvme147_sched_init (void)
    130{
    131	if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
    132			"timer 1", NULL))
    133		pr_err("Couldn't register timer interrupt\n");
    134
    135	/* Init the clock with a value */
    136	/* The clock counter increments until 0xFFFF then reloads */
    137	m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
    138	m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
    139			     PCC_TIMER_TIC_EN;
    140	m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
    141				 PCC_LEVEL_TIMER1;
    142
    143	clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
    144}
    145
    146static u64 mvme147_read_clk(struct clocksource *cs)
    147{
    148	unsigned long flags;
    149	u8 overflow, tmp;
    150	u16 count;
    151	u32 ticks;
    152
    153	local_irq_save(flags);
    154	tmp = m147_pcc->t1_cntrl >> 4;
    155	count = m147_pcc->t1_count;
    156	overflow = m147_pcc->t1_cntrl >> 4;
    157	if (overflow != tmp)
    158		count = m147_pcc->t1_count;
    159	count -= PCC_TIMER_PRELOAD;
    160	ticks = count + overflow * PCC_TIMER_CYCLES;
    161	ticks += clk_total;
    162	local_irq_restore(flags);
    163
    164	return ticks;
    165}
    166
    167static int bcd2int (unsigned char b)
    168{
    169	return ((b>>4)*10 + (b&15));
    170}
    171
    172int mvme147_hwclk(int op, struct rtc_time *t)
    173{
    174	if (!op) {
    175		m147_rtc->ctrl = RTC_READ;
    176		t->tm_year = bcd2int (m147_rtc->bcd_year);
    177		t->tm_mon  = bcd2int(m147_rtc->bcd_mth) - 1;
    178		t->tm_mday = bcd2int (m147_rtc->bcd_dom);
    179		t->tm_hour = bcd2int (m147_rtc->bcd_hr);
    180		t->tm_min  = bcd2int (m147_rtc->bcd_min);
    181		t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
    182		m147_rtc->ctrl = 0;
    183		if (t->tm_year < 70)
    184			t->tm_year += 100;
    185	} else {
    186		/* FIXME Setting the time is not yet supported */
    187		return -EOPNOTSUPP;
    188	}
    189	return 0;
    190}