mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-17 07:54:54 +08:00
54095a6ec7
The following problem was found by Giovambattista Pulcini <gpulcini@swintel.it>, who also provided a partial patch, and this has been verified by our time guru Gabriel Paubert <paubert@iram.es>. The problem is that in do_settimeofday() we always set time_state to TIME_ERROR and except on two platforms, never re-set it. This meant that ntp_gettime() and ntp_adjtime() always returned TIME_ERROR, incorrectly. Based on Gabriel's analysis, time_state is used for leap-second processing, and ppc shouldn't be mucking with it. Signed-off-by: Tom Rini <trini@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
582 lines
13 KiB
C
582 lines
13 KiB
C
/*
|
|
* arch/ppc/platforms/gemini_setup.c
|
|
*
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
* Adapted from 'alpha' version by Gary Thomas
|
|
* Modified by Cort Dougan (cort@cs.nmt.edu)
|
|
* Synergy Microsystems board support by Dan Cox (dan@synergymicro.com)
|
|
*
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/time.h>
|
|
#include <linux/kdev_t.h>
|
|
#include <linux/types.h>
|
|
#include <linux/major.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/console.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/root_dev.h>
|
|
#include <linux/bcd.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/page.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/io.h>
|
|
#include <asm/m48t35.h>
|
|
#include <platforms/gemini.h>
|
|
#include <asm/time.h>
|
|
#include <asm/open_pic.h>
|
|
#include <asm/bootinfo.h>
|
|
|
|
void gemini_find_bridges(void);
|
|
static int gemini_get_clock_speed(void);
|
|
extern void gemini_pcibios_fixup(void);
|
|
|
|
static char *gemini_board_families[] = {
|
|
"VGM", "VSS", "KGM", "VGR", "VCM", "VCS", "KCM", "VCR"
|
|
};
|
|
static int gemini_board_count = sizeof(gemini_board_families) /
|
|
sizeof(gemini_board_families[0]);
|
|
|
|
static unsigned int cpu_7xx[16] = {
|
|
0, 15, 14, 0, 0, 13, 5, 9, 6, 11, 8, 10, 16, 12, 7, 0
|
|
};
|
|
static unsigned int cpu_6xx[16] = {
|
|
0, 0, 14, 0, 0, 13, 5, 9, 6, 11, 8, 10, 0, 12, 7, 0
|
|
};
|
|
|
|
/*
|
|
* prom_init is the Gemini version of prom.c:prom_init. We only need
|
|
* the BSS clearing code, so I copied that out of prom.c. This is a
|
|
* lot simpler than hacking prom.c so it will build with Gemini. -VAL
|
|
*/
|
|
|
|
#define PTRRELOC(x) ((typeof(x))((unsigned long)(x) + offset))
|
|
|
|
unsigned long
|
|
prom_init(void)
|
|
{
|
|
unsigned long offset = reloc_offset();
|
|
unsigned long phys;
|
|
extern char __bss_start, _end;
|
|
|
|
/* First zero the BSS -- use memset, some arches don't have
|
|
* caches on yet */
|
|
memset_io(PTRRELOC(&__bss_start),0 , &_end - &__bss_start);
|
|
|
|
/* Default */
|
|
phys = offset + KERNELBASE;
|
|
|
|
gemini_prom_init();
|
|
|
|
return phys;
|
|
}
|
|
|
|
int
|
|
gemini_show_cpuinfo(struct seq_file *m)
|
|
{
|
|
unsigned char reg, rev;
|
|
char *family;
|
|
unsigned int type;
|
|
|
|
reg = readb(GEMINI_FEAT);
|
|
family = gemini_board_families[((reg>>4) & 0xf)];
|
|
if (((reg>>4) & 0xf) > gemini_board_count)
|
|
printk(KERN_ERR "cpuinfo(): unable to determine board family\n");
|
|
|
|
reg = readb(GEMINI_BREV);
|
|
type = (reg>>4) & 0xf;
|
|
rev = reg & 0xf;
|
|
|
|
reg = readb(GEMINI_BECO);
|
|
|
|
seq_printf(m, "machine\t\t: Gemini %s%d, rev %c, eco %d\n",
|
|
family, type, (rev + 'A'), (reg & 0xf));
|
|
|
|
seq_printf(m, "board\t\t: Gemini %s", family);
|
|
if (type > 9)
|
|
seq_printf(m, "%c", (type - 10) + 'A');
|
|
else
|
|
seq_printf(m, "%d", type);
|
|
|
|
seq_printf(m, ", rev %c, eco %d\n", (rev + 'A'), (reg & 0xf));
|
|
|
|
seq_printf(m, "clock\t\t: %dMhz\n", gemini_get_clock_speed());
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u_char gemini_openpic_initsenses[] = {
|
|
1,
|
|
1,
|
|
1,
|
|
1,
|
|
0,
|
|
0,
|
|
1, /* remainder are level-triggered */
|
|
};
|
|
|
|
#define GEMINI_MPIC_ADDR (0xfcfc0000)
|
|
#define GEMINI_MPIC_PCI_CFG (0x80005800)
|
|
|
|
void __init gemini_openpic_init(void)
|
|
{
|
|
|
|
OpenPIC_Addr = (volatile struct OpenPIC *)
|
|
grackle_read(GEMINI_MPIC_PCI_CFG + 0x10);
|
|
OpenPIC_InitSenses = gemini_openpic_initsenses;
|
|
OpenPIC_NumInitSenses = sizeof( gemini_openpic_initsenses );
|
|
|
|
ioremap( GEMINI_MPIC_ADDR, OPENPIC_SIZE);
|
|
}
|
|
|
|
|
|
extern unsigned long loops_per_jiffy;
|
|
extern int root_mountflags;
|
|
extern char cmd_line[];
|
|
|
|
void
|
|
gemini_heartbeat(void)
|
|
{
|
|
static unsigned long led = GEMINI_LEDBASE+(4*8);
|
|
static char direction = 8;
|
|
|
|
|
|
/* We only want to do this on 1 CPU */
|
|
if (smp_processor_id())
|
|
return;
|
|
*(char *)led = 0;
|
|
if ( (led + direction) > (GEMINI_LEDBASE+(7*8)) ||
|
|
(led + direction) < (GEMINI_LEDBASE+(4*8)) )
|
|
direction *= -1;
|
|
led += direction;
|
|
*(char *)led = 0xff;
|
|
ppc_md.heartbeat_count = ppc_md.heartbeat_reset;
|
|
}
|
|
|
|
void __init gemini_setup_arch(void)
|
|
{
|
|
extern char cmd_line[];
|
|
|
|
|
|
loops_per_jiffy = 50000000/HZ;
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/* bootable off CDROM */
|
|
if (initrd_start)
|
|
ROOT_DEV = Root_SR0;
|
|
else
|
|
#endif
|
|
ROOT_DEV = Root_SDA1;
|
|
|
|
/* nothing but serial consoles... */
|
|
sprintf(cmd_line, "%s console=ttyS0", cmd_line);
|
|
|
|
printk("Boot arguments: %s\n", cmd_line);
|
|
|
|
ppc_md.heartbeat = gemini_heartbeat;
|
|
ppc_md.heartbeat_reset = HZ/8;
|
|
ppc_md.heartbeat_count = 1;
|
|
|
|
/* Lookup PCI hosts */
|
|
gemini_find_bridges();
|
|
/* take special pains to map the MPIC, since it isn't mapped yet */
|
|
gemini_openpic_init();
|
|
/* start the L2 */
|
|
gemini_init_l2();
|
|
}
|
|
|
|
|
|
int
|
|
gemini_get_clock_speed(void)
|
|
{
|
|
unsigned long hid1, pvr;
|
|
int clock;
|
|
|
|
pvr = mfspr(SPRN_PVR);
|
|
hid1 = (mfspr(SPRN_HID1) >> 28) & 0xf;
|
|
if (PVR_VER(pvr) == 8 ||
|
|
PVR_VER(pvr) == 12)
|
|
hid1 = cpu_7xx[hid1];
|
|
else
|
|
hid1 = cpu_6xx[hid1];
|
|
|
|
switch((readb(GEMINI_BSTAT) & 0xc) >> 2) {
|
|
|
|
case 0:
|
|
default:
|
|
clock = (hid1*100)/3;
|
|
break;
|
|
|
|
case 1:
|
|
clock = (hid1*125)/3;
|
|
break;
|
|
|
|
case 2:
|
|
clock = (hid1*50);
|
|
break;
|
|
}
|
|
|
|
return clock;
|
|
}
|
|
|
|
void __init gemini_init_l2(void)
|
|
{
|
|
unsigned char reg, brev, fam, creg;
|
|
unsigned long cache;
|
|
unsigned long pvr;
|
|
|
|
reg = readb(GEMINI_L2CFG);
|
|
brev = readb(GEMINI_BREV);
|
|
fam = readb(GEMINI_FEAT);
|
|
pvr = mfspr(SPRN_PVR);
|
|
|
|
switch(PVR_VER(pvr)) {
|
|
|
|
case 8:
|
|
if (reg & 0xc0)
|
|
cache = (((reg >> 6) & 0x3) << 28);
|
|
else
|
|
cache = 0x3 << 28;
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Pre-3.0 processor revs had snooping errata. Leave
|
|
their L2's disabled with SMP. -- Dan */
|
|
if (PVR_CFG(pvr) < 3) {
|
|
printk("Pre-3.0 750; L2 left disabled!\n");
|
|
return;
|
|
}
|
|
#endif /* CONFIG_SMP */
|
|
|
|
/* Special case: VGM5-B's came before L2 ratios were set on
|
|
the board. Processor speed shouldn't be too high, so
|
|
set L2 ratio to 1:1.5. */
|
|
if ((brev == 0x51) && ((fam & 0xa0) >> 4) == 0)
|
|
reg |= 1;
|
|
|
|
/* determine best cache ratio based upon what the board
|
|
tells us (which sometimes _may_ not be true) and
|
|
the processor speed. */
|
|
else {
|
|
if (gemini_get_clock_speed() > 250)
|
|
reg = 2;
|
|
}
|
|
break;
|
|
case 12:
|
|
{
|
|
static unsigned long l2_size_val = 0;
|
|
|
|
if (!l2_size_val)
|
|
l2_size_val = _get_L2CR();
|
|
cache = l2_size_val;
|
|
break;
|
|
}
|
|
case 4:
|
|
case 9:
|
|
creg = readb(GEMINI_CPUSTAT);
|
|
if (((creg & 0xc) >> 2) != 1)
|
|
printk("Dual-604 boards don't support the use of L2\n");
|
|
else
|
|
writeb(1, GEMINI_L2CFG);
|
|
return;
|
|
default:
|
|
printk("Unknown processor; L2 left disabled\n");
|
|
return;
|
|
}
|
|
|
|
cache |= ((1<<reg) << 25);
|
|
cache |= (L2CR_L2RAM_MASK|L2CR_L2CTL|L2CR_L2DO);
|
|
_set_L2CR(0);
|
|
_set_L2CR(cache | L2CR_L2E);
|
|
|
|
}
|
|
|
|
void
|
|
gemini_restart(char *cmd)
|
|
{
|
|
local_irq_disable();
|
|
/* make a clean restart, not via the MPIC */
|
|
_gemini_reboot();
|
|
for(;;);
|
|
}
|
|
|
|
void
|
|
gemini_power_off(void)
|
|
{
|
|
for(;;);
|
|
}
|
|
|
|
void
|
|
gemini_halt(void)
|
|
{
|
|
gemini_restart(NULL);
|
|
}
|
|
|
|
void __init gemini_init_IRQ(void)
|
|
{
|
|
/* gemini has no 8259 */
|
|
openpic_init(1, 0, 0, -1);
|
|
}
|
|
|
|
#define gemini_rtc_read(x) (readb(GEMINI_RTC+(x)))
|
|
#define gemini_rtc_write(val,x) (writeb((val),(GEMINI_RTC+(x))))
|
|
|
|
/* ensure that the RTC is up and running */
|
|
long __init gemini_time_init(void)
|
|
{
|
|
unsigned char reg;
|
|
|
|
reg = gemini_rtc_read(M48T35_RTC_CONTROL);
|
|
|
|
if ( reg & M48T35_RTC_STOPPED ) {
|
|
printk(KERN_INFO "M48T35 real-time-clock was stopped. Now starting...\n");
|
|
gemini_rtc_write((reg & ~(M48T35_RTC_STOPPED)), M48T35_RTC_CONTROL);
|
|
gemini_rtc_write((reg | M48T35_RTC_SET), M48T35_RTC_CONTROL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#undef DEBUG_RTC
|
|
|
|
unsigned long
|
|
gemini_get_rtc_time(void)
|
|
{
|
|
unsigned int year, mon, day, hour, min, sec;
|
|
unsigned char reg;
|
|
|
|
reg = gemini_rtc_read(M48T35_RTC_CONTROL);
|
|
gemini_rtc_write((reg|M48T35_RTC_READ), M48T35_RTC_CONTROL);
|
|
#ifdef DEBUG_RTC
|
|
printk("get rtc: reg = %x\n", reg);
|
|
#endif
|
|
|
|
do {
|
|
sec = gemini_rtc_read(M48T35_RTC_SECONDS);
|
|
min = gemini_rtc_read(M48T35_RTC_MINUTES);
|
|
hour = gemini_rtc_read(M48T35_RTC_HOURS);
|
|
day = gemini_rtc_read(M48T35_RTC_DOM);
|
|
mon = gemini_rtc_read(M48T35_RTC_MONTH);
|
|
year = gemini_rtc_read(M48T35_RTC_YEAR);
|
|
} while( sec != gemini_rtc_read(M48T35_RTC_SECONDS));
|
|
#ifdef DEBUG_RTC
|
|
printk("get rtc: sec=%x, min=%x, hour=%x, day=%x, mon=%x, year=%x\n",
|
|
sec, min, hour, day, mon, year);
|
|
#endif
|
|
|
|
gemini_rtc_write(reg, M48T35_RTC_CONTROL);
|
|
|
|
BCD_TO_BIN(sec);
|
|
BCD_TO_BIN(min);
|
|
BCD_TO_BIN(hour);
|
|
BCD_TO_BIN(day);
|
|
BCD_TO_BIN(mon);
|
|
BCD_TO_BIN(year);
|
|
|
|
if ((year += 1900) < 1970)
|
|
year += 100;
|
|
#ifdef DEBUG_RTC
|
|
printk("get rtc: sec=%x, min=%x, hour=%x, day=%x, mon=%x, year=%x\n",
|
|
sec, min, hour, day, mon, year);
|
|
#endif
|
|
|
|
return mktime( year, mon, day, hour, min, sec );
|
|
}
|
|
|
|
|
|
int
|
|
gemini_set_rtc_time( unsigned long now )
|
|
{
|
|
unsigned char reg;
|
|
struct rtc_time tm;
|
|
|
|
to_tm( now, &tm );
|
|
|
|
reg = gemini_rtc_read(M48T35_RTC_CONTROL);
|
|
#ifdef DEBUG_RTC
|
|
printk("set rtc: reg = %x\n", reg);
|
|
#endif
|
|
|
|
gemini_rtc_write((reg|M48T35_RTC_SET), M48T35_RTC_CONTROL);
|
|
#ifdef DEBUG_RTC
|
|
printk("set rtc: tm vals - sec=%x, min=%x, hour=%x, mon=%x, mday=%x, year=%x\n",
|
|
tm.tm_sec, tm.tm_min, tm.tm_hour, tm.tm_mon, tm.tm_mday, tm.tm_year);
|
|
#endif
|
|
|
|
tm.tm_year -= 1900;
|
|
BIN_TO_BCD(tm.tm_sec);
|
|
BIN_TO_BCD(tm.tm_min);
|
|
BIN_TO_BCD(tm.tm_hour);
|
|
BIN_TO_BCD(tm.tm_mon);
|
|
BIN_TO_BCD(tm.tm_mday);
|
|
BIN_TO_BCD(tm.tm_year);
|
|
#ifdef DEBUG_RTC
|
|
printk("set rtc: tm vals - sec=%x, min=%x, hour=%x, mon=%x, mday=%x, year=%x\n",
|
|
tm.tm_sec, tm.tm_min, tm.tm_hour, tm.tm_mon, tm.tm_mday, tm.tm_year);
|
|
#endif
|
|
|
|
gemini_rtc_write(tm.tm_sec, M48T35_RTC_SECONDS);
|
|
gemini_rtc_write(tm.tm_min, M48T35_RTC_MINUTES);
|
|
gemini_rtc_write(tm.tm_hour, M48T35_RTC_HOURS);
|
|
gemini_rtc_write(tm.tm_mday, M48T35_RTC_DOM);
|
|
gemini_rtc_write(tm.tm_mon, M48T35_RTC_MONTH);
|
|
gemini_rtc_write(tm.tm_year, M48T35_RTC_YEAR);
|
|
|
|
/* done writing */
|
|
gemini_rtc_write(reg, M48T35_RTC_CONTROL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* use the RTC to determine the decrementer count */
|
|
void __init gemini_calibrate_decr(void)
|
|
{
|
|
int freq, divisor;
|
|
unsigned char reg;
|
|
|
|
/* determine processor bus speed */
|
|
reg = readb(GEMINI_BSTAT);
|
|
|
|
switch(((reg & 0x0c)>>2)&0x3) {
|
|
case 0:
|
|
default:
|
|
freq = 66667;
|
|
break;
|
|
case 1:
|
|
freq = 83000;
|
|
break;
|
|
case 2:
|
|
freq = 100000;
|
|
break;
|
|
}
|
|
|
|
freq *= 1000;
|
|
divisor = 4;
|
|
tb_ticks_per_jiffy = freq / HZ / divisor;
|
|
tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
|
|
}
|
|
|
|
unsigned long __init gemini_find_end_of_memory(void)
|
|
{
|
|
unsigned long total;
|
|
unsigned char reg;
|
|
|
|
reg = readb(GEMINI_MEMCFG);
|
|
total = ((1<<((reg & 0x7) - 1)) *
|
|
(8<<((reg >> 3) & 0x7)));
|
|
total *= (1024*1024);
|
|
return total;
|
|
}
|
|
|
|
static void __init
|
|
gemini_map_io(void)
|
|
{
|
|
io_block_mapping(0xf0000000, 0xf0000000, 0x10000000, _PAGE_IO);
|
|
io_block_mapping(0x80000000, 0x80000000, 0x10000000, _PAGE_IO);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int
|
|
smp_gemini_probe(void)
|
|
{
|
|
int i, nr;
|
|
|
|
nr = (readb(GEMINI_CPUSTAT) & GEMINI_CPU_COUNT_MASK) >> 2;
|
|
if (nr == 0)
|
|
nr = 4;
|
|
|
|
if (nr > 1) {
|
|
openpic_request_IPIs();
|
|
for (i = 1; i < nr; ++i)
|
|
smp_hw_index[i] = i;
|
|
}
|
|
|
|
return nr;
|
|
}
|
|
|
|
static void
|
|
smp_gemini_kick_cpu(int nr)
|
|
{
|
|
openpic_reset_processor_phys(1 << nr);
|
|
openpic_reset_processor_phys(0);
|
|
}
|
|
|
|
static void
|
|
smp_gemini_setup_cpu(int cpu_nr)
|
|
{
|
|
if (OpenPIC_Addr)
|
|
do_openpic_setup_cpu();
|
|
if (cpu_nr > 0)
|
|
gemini_init_l2();
|
|
}
|
|
|
|
static struct smp_ops_t gemini_smp_ops = {
|
|
smp_openpic_message_pass,
|
|
smp_gemini_probe,
|
|
smp_gemini_kick_cpu,
|
|
smp_gemini_setup_cpu,
|
|
.give_timebase = smp_generic_give_timebase,
|
|
.take_timebase = smp_generic_take_timebase,
|
|
};
|
|
#endif /* CONFIG_SMP */
|
|
|
|
void __init platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7)
|
|
{
|
|
int i;
|
|
|
|
/* Restore BATs for now */
|
|
mtspr(SPRN_DBAT3U, 0xf0001fff);
|
|
mtspr(SPRN_DBAT3L, 0xf000002a);
|
|
|
|
parse_bootinfo(find_bootinfo());
|
|
|
|
for(i = 0; i < GEMINI_LEDS; i++)
|
|
gemini_led_off(i);
|
|
|
|
ISA_DMA_THRESHOLD = 0;
|
|
DMA_MODE_READ = 0;
|
|
DMA_MODE_WRITE = 0;
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if ( r4 )
|
|
{
|
|
initrd_start = r4 + KERNELBASE;
|
|
initrd_end = r5 + KERNELBASE;
|
|
}
|
|
#endif
|
|
|
|
ppc_md.setup_arch = gemini_setup_arch;
|
|
ppc_md.show_cpuinfo = gemini_show_cpuinfo;
|
|
ppc_md.irq_canonicalize = NULL;
|
|
ppc_md.init_IRQ = gemini_init_IRQ;
|
|
ppc_md.get_irq = openpic_get_irq;
|
|
ppc_md.init = NULL;
|
|
|
|
ppc_md.restart = gemini_restart;
|
|
ppc_md.power_off = gemini_power_off;
|
|
ppc_md.halt = gemini_halt;
|
|
|
|
ppc_md.time_init = gemini_time_init;
|
|
ppc_md.set_rtc_time = gemini_set_rtc_time;
|
|
ppc_md.get_rtc_time = gemini_get_rtc_time;
|
|
ppc_md.calibrate_decr = gemini_calibrate_decr;
|
|
|
|
ppc_md.find_end_of_memory = gemini_find_end_of_memory;
|
|
ppc_md.setup_io_mappings = gemini_map_io;
|
|
|
|
ppc_md.pcibios_fixup_bus = gemini_pcibios_fixup;
|
|
|
|
#ifdef CONFIG_SMP
|
|
ppc_md.smp_ops = &gemini_smp_ops;
|
|
#endif /* CONFIG_SMP */
|
|
}
|