freebsd-skq/sys/mips/malta/malta_machdep.c

359 lines
7.9 KiB
C

/*-
* Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/imgact.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/cons.h>
#include <sys/exec.h>
#include <sys/ucontext.h>
#include <sys/proc.h>
#include <sys/kdb.h>
#include <sys/ptrace.h>
#include <sys/reboot.h>
#include <sys/signalvar.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/user.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <machine/clock.h>
#include <machine/cpu.h>
#include <machine/cpuregs.h>
#include <machine/hwfunc.h>
#include <machine/md_var.h>
#include <machine/pmap.h>
#include <machine/trap.h>
#ifdef TICK_USE_YAMON_FREQ
#include <mips/malta/yamon.h>
#endif
#ifdef TICK_USE_MALTA_RTC
#include <mips/mips4k/malta/maltareg.h>
#include <dev/mc146818/mc146818reg.h>
#include <isa/rtc.h>
#endif
#include <mips/malta/maltareg.h>
extern int *edata;
extern int *end;
void lcd_init(void);
void lcd_puts(char *);
void malta_reset(void);
/*
* Temporary boot environment used at startup.
*/
static char boot1_env[4096];
/*
* Offsets to MALTA LCD characters.
*/
static int malta_lcd_offs[] = {
MALTA_ASCIIPOS0,
MALTA_ASCIIPOS1,
MALTA_ASCIIPOS2,
MALTA_ASCIIPOS3,
MALTA_ASCIIPOS4,
MALTA_ASCIIPOS5,
MALTA_ASCIIPOS6,
MALTA_ASCIIPOS7
};
void
platform_cpu_init()
{
/* Nothing special */
}
/*
* Put character to Malta LCD at given position.
*/
static void
malta_lcd_putc(int pos, char c)
{
void *addr;
char *ch;
if (pos < 0 || pos > 7)
return;
addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
*ch = c;
}
/*
* Print given string on LCD.
*/
static void
malta_lcd_print(char *str)
{
int i;
if (str == NULL)
return;
for (i = 0; *str != '\0'; i++, str++)
malta_lcd_putc(i, *str);
}
void
lcd_init(void)
{
malta_lcd_print("FreeBSD_");
}
void
lcd_puts(char *s)
{
malta_lcd_print(s);
}
#ifdef TICK_USE_MALTA_RTC
static __inline uint8_t
rtcin(uint8_t addr)
{
*((volatile uint8_t *)
MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
return (*((volatile uint8_t *)
MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
}
static __inline void
writertc(uint8_t addr, uint8_t val)
{
*((volatile uint8_t *)
MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
*((volatile uint8_t *)
MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
}
#endif
static void
mips_init(unsigned long memsize, uint64_t ememsize)
{
int i;
for (i = 0; i < PHYS_AVAIL_ENTRIES; i++) {
phys_avail[i] = 0;
}
/*
* memsize is the amount of RAM available below 256MB.
* ememsize is the total amount of RAM available.
*
* The second bank starts at 0x90000000.
*/
/* phys_avail regions are in bytes */
phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
phys_avail[1] = memsize;
dump_avail[0] = phys_avail[0];
dump_avail[1] = phys_avail[1];
/* Only specify the extended region if it's set */
if (ememsize > memsize) {
phys_avail[2] = 0x90000000;
phys_avail[3] = 0x90000000 + (ememsize - memsize);
dump_avail[2] = phys_avail[2];
dump_avail[3] = phys_avail[3];
}
/* XXX realmem assigned in the caller of mips_init() */
physmem = realmem;
init_param1();
init_param2(physmem);
mips_cpu_init();
pmap_bootstrap();
mips_proc0_init();
mutex_init();
kdb_init();
#ifdef KDB
if (boothowto & RB_KDB)
kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
#endif
}
/*
* Perform a board-level soft-reset.
* Note that this is not emulated by gxemul.
*/
void
platform_reset(void)
{
char *c;
c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
*c = MALTA_GORESET;
}
static uint64_t
malta_cpu_freq(void)
{
uint64_t platform_counter_freq = 0;
#if defined(TICK_USE_YAMON_FREQ)
/*
* If we are running on a board which uses YAMON firmware,
* then query CPU pipeline clock from the syscon object.
* If unsuccessful, use hard-coded default.
*/
platform_counter_freq = yamon_getcpufreq();
#elif defined(TICK_USE_MALTA_RTC)
/*
* If we are running on a board with the MC146818 RTC,
* use it to determine CPU pipeline clock frequency.
*/
u_int64_t counterval[2];
/* Set RTC to binary mode. */
writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
/* Busy-wait for falling edge of RTC update. */
while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
;
while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
;
counterval[0] = mips_rd_count();
/* Busy-wait for falling edge of RTC update. */
while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
;
while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
;
counterval[1] = mips_rd_count();
platform_counter_freq = counterval[1] - counterval[0];
#endif
if (platform_counter_freq == 0)
platform_counter_freq = MIPS_DEFAULT_HZ;
return (platform_counter_freq);
}
void
platform_start(__register_t a0, __register_t a1, __register_t a2,
__register_t a3)
{
vm_offset_t kernend;
uint64_t platform_counter_freq;
int argc = a0;
int32_t *argv = (int32_t*)a1;
int32_t *envp = (int32_t*)a2;
unsigned int memsize = a3;
uint64_t ememsize = 0;
int i;
/* clear the BSS and SBSS segments */
kernend = (vm_offset_t)&end;
memset(&edata, 0, kernend - (vm_offset_t)(&edata));
mips_postboot_fixup();
mips_pcpu0_init();
platform_counter_freq = malta_cpu_freq();
mips_timer_early_init(platform_counter_freq);
init_static_kenv(boot1_env, sizeof(boot1_env));
cninit();
printf("entry: platform_start()\n");
bootverbose = 1;
/*
* YAMON uses 32bit pointers to strings so
* convert them to proper type manually
*/
if (bootverbose) {
printf("cmd line: ");
for (i = 0; i < argc; i++)
printf("%s ", (char*)(intptr_t)argv[i]);
printf("\n");
}
if (bootverbose)
printf("envp:\n");
/*
* Parse the environment for things like ememsize.
*/
for (i = 0; envp[i]; i += 2) {
const char *a, *v;
a = (char *)(intptr_t)envp[i];
v = (char *)(intptr_t)envp[i+1];
if (bootverbose)
printf("\t%s = %s\n", a, v);
if (strcmp(a, "ememsize") == 0) {
ememsize = strtoul(v, NULL, 0);
}
}
if (bootverbose) {
printf("memsize = %llu (0x%08x)\n",
(unsigned long long) memsize, memsize);
printf("ememsize = %llu\n", (unsigned long long) ememsize);
}
/*
* For <= 256MB RAM amounts, ememsize should equal memsize.
* For > 256MB RAM amounts it's the total RAM available;
* split between two banks.
*
* XXX TODO: just push realmem assignment into mips_init() ?
*/
realmem = btoc(ememsize);
mips_init(memsize, ememsize);
mips_timer_init_params(platform_counter_freq, 0);
}