misc.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:16k
- /*
- * Miscellaneous Mac68K-specific stuff
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <linux/miscdevice.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/sched.h>
- #include <linux/slab.h>
- #include <linux/time.h>
- #include <linux/rtc.h>
- #include <linux/mm.h>
- #include <linux/adb.h>
- #include <linux/cuda.h>
- #include <linux/pmu.h>
- #include <asm/uaccess.h>
- #include <asm/io.h>
- #include <asm/rtc.h>
- #include <asm/system.h>
- #include <asm/segment.h>
- #include <asm/setup.h>
- #include <asm/macintosh.h>
- #include <asm/mac_via.h>
- #include <asm/mac_oss.h>
- #define BOOTINFO_COMPAT_1_0
- #include <asm/bootinfo.h>
- #include <asm/machdep.h>
- /* Offset between Unix time (1970-based) and Mac time (1904-based) */
- #define RTC_OFFSET 2082844800
- extern struct mac_booter_data mac_bi_data;
- static void (*rom_reset)(void);
- /*
- * Return the current time as the number of seconds since January 1, 1904.
- */
- static long adb_read_time(void)
- {
- volatile struct adb_request req;
- long time;
- adb_request((struct adb_request *) &req, NULL,
- ADBREQ_RAW|ADBREQ_SYNC,
- 2, CUDA_PACKET, CUDA_GET_TIME);
- time = (req.reply[3] << 24) | (req.reply[4] << 16)
- | (req.reply[5] << 8) | req.reply[6];
- return time - RTC_OFFSET;
- }
- /*
- * Set the current system time
- */
- static void adb_write_time(long data)
- {
- volatile struct adb_request req;
- data += RTC_OFFSET;
-
- adb_request((struct adb_request *) &req, NULL,
- ADBREQ_RAW|ADBREQ_SYNC,
- 6, CUDA_PACKET, CUDA_SET_TIME,
- (data >> 24) & 0xFF, (data >> 16) & 0xFF,
- (data >> 8) & 0xFF, data & 0xFF);
- }
- /*
- * Get a byte from the NVRAM
- */
- static __u8 adb_read_pram(int offset)
- {
- volatile struct adb_request req;
- adb_request((struct adb_request *) &req, NULL,
- ADBREQ_RAW|ADBREQ_SYNC,
- 4, CUDA_PACKET, CUDA_GET_PRAM,
- (offset >> 8) & 0xFF, offset & 0xFF);
- return req.reply[3];
- }
- /*
- * Write a byte to the NVRAM
- */
- static void adb_write_pram(int offset, __u8 data)
- {
- volatile struct adb_request req;
- adb_request((struct adb_request *) &req, NULL,
- ADBREQ_RAW|ADBREQ_SYNC,
- 5, CUDA_PACKET, CUDA_SET_PRAM,
- (offset >> 8) & 0xFF, offset & 0xFF,
- data);
- }
- /*
- * VIA PRAM/RTC access routines
- *
- * Must be called with interrupts disabled and
- * the RTC should be enabled.
- */
- static __u8 via_pram_readbyte(void)
- {
- int i,reg;
- __u8 data;
- reg = via1[vBufB] & ~VIA1B_vRTCClk;
- /* Set the RTC data line to be an input. */
- via1[vDirB] &= ~VIA1B_vRTCData;
- /* The bits of the byte come out in MSB order */
- data = 0;
- for (i = 0 ; i < 8 ; i++) {
- via1[vBufB] = reg;
- via1[vBufB] = reg | VIA1B_vRTCClk;
- data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
- }
- /* Return RTC data line to output state */
- via1[vDirB] |= VIA1B_vRTCData;
- return data;
- }
- static void via_pram_writebyte(__u8 data)
- {
- int i,reg,bit;
- reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);
- /* The bits of the byte go in in MSB order */
- for (i = 0 ; i < 8 ; i++) {
- bit = data & 0x80? 1 : 0;
- data <<= 1;
- via1[vBufB] = reg | bit;
- via1[vBufB] = reg | bit | VIA1B_vRTCClk;
- }
- }
- /*
- * Execute a VIA PRAM/RTC command. For read commands
- * data should point to a one-byte buffer for the
- * resulting data. For write commands it should point
- * to the data byte to for the command.
- *
- * This function disables all interrupts while running.
- */
- static void via_pram_command(int command, __u8 *data)
- {
- unsigned long cpu_flags;
- int is_read;
- save_flags(cpu_flags);
- cli();
- /* Enable the RTC and make sure the strobe line is high */
- via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;
- if (command & 0xFF00) { /* extended (two-byte) command */
- via_pram_writebyte((command & 0xFF00) >> 8);
- via_pram_writebyte(command & 0xFF);
- is_read = command & 0x8000;
- } else { /* one-byte command */
- via_pram_writebyte(command);
- is_read = command & 0x80;
- }
- if (is_read) {
- *data = via_pram_readbyte();
- } else {
- via_pram_writebyte(*data);
- }
- /* All done, disable the RTC */
- via1[vBufB] |= VIA1B_vRTCEnb;
- restore_flags(cpu_flags);
- }
- static __u8 via_read_pram(int offset)
- {
- return 0;
- }
- static void via_write_pram(int offset, __u8 data)
- {
- }
- /*
- * Return the current time in seconds since January 1, 1904.
- *
- * This only works on machines with the VIA-based PRAM/RTC, which
- * is basically any machine with Mac II-style ADB.
- */
- static long via_read_time(void)
- {
- union {
- __u8 cdata[4];
- long idata;
- } result, last_result;
- int ct;
- /*
- * The NetBSD guys say to loop until you get the same reading
- * twice in a row.
- */
- ct = 0;
- do {
- if (++ct > 10) {
- printk("via_read_time: couldn't get valid time, "
- "last read = 0x%08lx and 0x%08lxn",
- last_result.idata, result.idata);
- break;
- }
- last_result.idata = result.idata;
- result.idata = 0;
- via_pram_command(0x81, &result.cdata[3]);
- via_pram_command(0x85, &result.cdata[2]);
- via_pram_command(0x89, &result.cdata[1]);
- via_pram_command(0x8D, &result.cdata[0]);
- } while (result.idata != last_result.idata);
- return result.idata - RTC_OFFSET;
- }
- /*
- * Set the current time to a number of seconds since January 1, 1904.
- *
- * This only works on machines with the VIA-based PRAM/RTC, which
- * is basically any machine with Mac II-style ADB.
- */
- static void via_write_time(long time)
- {
- union {
- __u8 cdata[4];
- long idata;
- } data;
- __u8 temp;
- /* Clear the write protect bit */
- temp = 0x55;
- via_pram_command(0x35, &temp);
- data.idata = time + RTC_OFFSET;
- via_pram_command(0x01, &data.cdata[3]);
- via_pram_command(0x05, &data.cdata[2]);
- via_pram_command(0x09, &data.cdata[1]);
- via_pram_command(0x0D, &data.cdata[0]);
- /* Set the write protect bit */
- temp = 0xD5;
- via_pram_command(0x35, &temp);
- }
- static void via_shutdown(void)
- {
- if (rbv_present) {
- via2[rBufB] &= ~0x04;
- } else {
- /* Direction of vDirB is output */
- via2[vDirB] |= 0x04;
- /* Send a value of 0 on that line */
- via2[vBufB] &= ~0x04;
- mdelay(1000);
- }
- }
- /*
- * FIXME: not sure how this is supposed to work exactly...
- */
- static void oss_shutdown(void)
- {
- oss->rom_ctrl = OSS_POWEROFF;
- }
- #ifdef CONFIG_ADB_CUDA
- static void cuda_restart(void)
- {
- adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
- 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
- }
- static void cuda_shutdown(void)
- {
- adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
- 2, CUDA_PACKET, CUDA_POWERDOWN);
- }
- #endif /* CONFIG_ADB_CUDA */
- #ifdef CONFIG_ADB_PMU
- void pmu_restart(void)
- {
- adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
- 3, PMU_PACKET, PMU_SET_INTR_MASK,
- PMU_INT_ADB|PMU_INT_TICK);
-
- adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
- 2, PMU_PACKET, PMU_RESET);
- }
- void pmu_shutdown(void)
- {
- adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
- 3, PMU_PACKET, PMU_SET_INTR_MASK,
- PMU_INT_ADB|PMU_INT_TICK);
- adb_request(NULL, NULL, ADBREQ_RAW|ADBREQ_SYNC,
- 6, PMU_PACKET, PMU_SHUTDOWN,
- 'M', 'A', 'T', 'T');
- }
- #endif /* CONFIG_ADB_PMU */
- /*
- *-------------------------------------------------------------------
- * Below this point are the generic routines; they'll dispatch to the
- * correct routine for the hardware on which we're running.
- *-------------------------------------------------------------------
- */
- void mac_pram_read(int offset, __u8 *buffer, int len)
- {
- __u8 (*func)(int) = NULL;
- int i;
- if (macintosh_config->adb_type == MAC_ADB_IISI ||
- macintosh_config->adb_type == MAC_ADB_PB1 ||
- macintosh_config->adb_type == MAC_ADB_PB2 ||
- macintosh_config->adb_type == MAC_ADB_CUDA) {
- func = adb_read_pram;
- } else {
- func = via_read_pram;
- }
- for (i = 0 ; i < len ; i++) {
- buffer[i] = (*func)(offset++);
- }
- }
- void mac_pram_write(int offset, __u8 *buffer, int len)
- {
- void (*func)(int, __u8) = NULL;
- int i;
- if (macintosh_config->adb_type == MAC_ADB_IISI ||
- macintosh_config->adb_type == MAC_ADB_PB1 ||
- macintosh_config->adb_type == MAC_ADB_PB2 ||
- macintosh_config->adb_type == MAC_ADB_CUDA) {
- func = adb_write_pram;
- } else {
- func = via_write_pram;
- }
- for (i = 0 ; i < len ; i++) {
- (*func)(offset++, buffer[i]);
- }
- }
- void mac_poweroff(void)
- {
- /*
- * MAC_ADB_IISI may need to be moved up here if it doesn't actually
- * work using the ADB packet method. --David Kilzer
- */
- if (oss_present) {
- oss_shutdown();
- } else if (macintosh_config->adb_type == MAC_ADB_II) {
- via_shutdown();
- #ifdef CONFIG_ADB_CUDA
- } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
- cuda_shutdown();
- #endif
- #ifdef CONFIG_ADB_PMU
- } else if (macintosh_config->adb_type == MAC_ADB_PB1
- || macintosh_config->adb_type == MAC_ADB_PB2) {
- pmu_shutdown();
- #endif
- }
- sti();
- printk("It is now safe to turn off your Macintosh.n");
- while(1);
- }
- void mac_reset(void)
- {
- if (macintosh_config->adb_type == MAC_ADB_II) {
- unsigned long cpu_flags;
- /* need ROMBASE in booter */
- /* indeed, plus need to MAP THE ROM !! */
- if (mac_bi_data.rombase == 0)
- mac_bi_data.rombase = 0x40800000;
- /* works on some */
- rom_reset = (void *) (mac_bi_data.rombase + 0xa);
- if (macintosh_config->ident == MAC_MODEL_SE30) {
- /*
- * MSch: Machines known to crash on ROM reset ...
- */
- } else {
- save_flags(cpu_flags);
- cli();
- rom_reset();
- restore_flags(cpu_flags);
- }
- #ifdef CONFIG_ADB_CUDA
- } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
- cuda_restart();
- #endif
- #ifdef CONFIG_ADB_PMU
- } else if (macintosh_config->adb_type == MAC_ADB_PB1
- || macintosh_config->adb_type == MAC_ADB_PB2) {
- pmu_restart();
- #endif
- } else if (CPU_IS_030) {
- /* 030-specific reset routine. The idea is general, but the
- * specific registers to reset are '030-specific. Until I
- * have a non-030 machine, I can't test anything else.
- * -- C. Scott Ananian <cananian@alumni.princeton.edu>
- */
- unsigned long rombase = 0x40000000;
- /* make a 1-to-1 mapping, using the transparent tran. reg. */
- unsigned long virt = (unsigned long) mac_reset;
- unsigned long phys = virt_to_phys(mac_reset);
- unsigned long offset = phys-virt;
- cli(); /* lets not screw this up, ok? */
- __asm__ __volatile__(".chip 68030nt"
- "pmove %0,%/tt0nt"
- ".chip 68k"
- : : "m" ((phys&0xFF000000)|0x8777));
- /* Now jump to physical address so we can disable MMU */
- __asm__ __volatile__(
- ".chip 68030nt"
- "lea %/pc@(1f),%/a0nt"
- "addl %0,%/a0nt"/* fixup target address and stack ptr */
- "addl %0,%/spnt"
- "pflushant"
- "jmp %/a0@nt" /* jump into physical memory */
- "0:.long 0nt" /* a constant zero. */
- /* OK. Now reset everything and jump to reset vector. */
- "1:nt"
- "lea %/pc@(0b),%/a0nt"
- "pmove %/a0@, %/tcnt" /* disable mmu */
- "pmove %/a0@, %/tt0nt" /* disable tt0 */
- "pmove %/a0@, %/tt1nt" /* disable tt1 */
- "movel #0, %/a0nt"
- "movec %/a0, %/vbrnt" /* clear vector base register */
- "movec %/a0, %/cacrnt" /* disable caches */
- "movel #0x0808,%/a0nt"
- "movec %/a0, %/cacrnt" /* flush i&d caches */
- "movew #0x2700,%/srnt" /* set up status register */
- "movel %1@(0x0),%/a0nt"/* load interrupt stack pointer */
- "movec %/a0, %/ispnt"
- "movel %1@(0x4),%/a0nt" /* load reset vector */
- "resetnt" /* reset external devices */
- "jmp %/a0@nt" /* jump to the reset vector */
- ".chip 68k"
- : : "r" (offset), "a" (rombase) : "a0");
- }
- /* should never get here */
- sti();
- printk ("Restart failed. Please restart manually.n");
- while(1);
- }
- /*
- * This function translates seconds since 1970 into a proper date.
- *
- * Algorithm cribbed from glibc2.1, __offtime().
- */
- #define SECS_PER_MINUTE (60)
- #define SECS_PER_HOUR (SECS_PER_MINUTE * 60)
- #define SECS_PER_DAY (SECS_PER_HOUR * 24)
- static void unmktime(unsigned long time, long offset,
- int *yearp, int *monp, int *dayp,
- int *hourp, int *minp, int *secp)
- {
- /* How many days come before each month (0-12). */
- static const unsigned short int __mon_yday[2][13] =
- {
- /* Normal years. */
- { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
- /* Leap years. */
- { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
- };
- long int days, rem, y, wday, yday;
- const unsigned short int *ip;
- days = time / SECS_PER_DAY;
- rem = time % SECS_PER_DAY;
- rem += offset;
- while (rem < 0) {
- rem += SECS_PER_DAY;
- --days;
- }
- while (rem >= SECS_PER_DAY) {
- rem -= SECS_PER_DAY;
- ++days;
- }
- *hourp = rem / SECS_PER_HOUR;
- rem %= SECS_PER_HOUR;
- *minp = rem / SECS_PER_MINUTE;
- *secp = rem % SECS_PER_MINUTE;
- /* January 1, 1970 was a Thursday. */
- wday = (4 + days) % 7; /* Day in the week. Not currently used */
- if (wday < 0) wday += 7;
- y = 1970;
- #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
- #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
- #define __isleap(year)
- ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
- while (days < 0 || days >= (__isleap (y) ? 366 : 365))
- {
- /* Guess a corrected year, assuming 365 days per year. */
- long int yg = y + days / 365 - (days % 365 < 0);
- /* Adjust DAYS and Y to match the guessed year. */
- days -= ((yg - y) * 365
- + LEAPS_THRU_END_OF (yg - 1)
- - LEAPS_THRU_END_OF (y - 1));
- y = yg;
- }
- *yearp = y - 1900;
- yday = days; /* day in the year. Not currently used. */
- ip = __mon_yday[__isleap(y)];
- for (y = 11; days < (long int) ip[y]; --y)
- continue;
- days -= ip[y];
- *monp = y;
- *dayp = days + 1; /* day in the month */
- return;
- }
- /*
- * Return the boot time for use in initializing the kernel clock.
- *
- * I'd like to read the hardware clock here but many machines read
- * the PRAM through ADB, and interrupts aren't initialized when this
- * is called so ADB obviously won't work.
- */
- void mac_gettod(int *yearp, int *monp, int *dayp,
- int *hourp, int *minp, int *secp)
- {
- /* Yes the GMT bias is backwards. It looks like Penguin is
- screwing up the boottime it gives us... This works for me
- in Canada/Eastern but it might be wrong everywhere else. */
- unmktime(mac_bi_data.boottime, -mac_bi_data.gmtbias * 60,
- yearp, monp, dayp, hourp, minp, secp);
- /* For some reason this is off by one */
- *monp = *monp + 1;
- }
- /*
- * Read/write the hardware clock.
- */
- int mac_hwclk(int op, struct rtc_time *t)
- {
- unsigned long now;
- if (!op) { /* read */
- if (macintosh_config->adb_type == MAC_ADB_II) {
- now = via_read_time();
- } else if ((macintosh_config->adb_type == MAC_ADB_IISI) ||
- (macintosh_config->adb_type == MAC_ADB_PB1) ||
- (macintosh_config->adb_type == MAC_ADB_PB2) ||
- (macintosh_config->adb_type == MAC_ADB_CUDA)) {
- now = adb_read_time();
- } else if (macintosh_config->adb_type == MAC_ADB_IOP) {
- now = via_read_time();
- } else {
- now = 0;
- }
- t->tm_wday = 0;
- unmktime(now, 0,
- &t->tm_year, &t->tm_mon, &t->tm_mday,
- &t->tm_hour, &t->tm_min, &t->tm_sec);
- printk("mac_hwclk: read %04d-%02d-%-2d %02d:%02d:%02dn",
- t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
- } else { /* write */
- printk("mac_hwclk: tried to write %04d-%02d-%-2d %02d:%02d:%02dn",
- t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
- #if 0 /* it trashes my rtc */
- now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
- t->tm_hour, t->tm_min, t->tm_sec);
- if (macintosh_config->adb_type == MAC_ADB_II) {
- via_write_time(now);
- } else if ((macintosh_config->adb_type == MAC_ADB_IISI) ||
- (macintosh_config->adb_type == MAC_ADB_PB1) ||
- (macintosh_config->adb_type == MAC_ADB_PB2) ||
- (macintosh_config->adb_type == MAC_ADB_CUDA)) {
- adb_write_time(now);
- } else if (macintosh_config->adb_type == MAC_ADB_IOP) {
- via_write_time(now);
- }
- #endif
- }
- return 0;
- }
- /*
- * Set minutes/seconds in the hardware clock
- */
- int mac_set_clock_mmss (unsigned long nowtime)
- {
- struct rtc_time now;
- mac_hwclk(0, &now);
- now.tm_sec = nowtime % 60;
- now.tm_min = (nowtime / 60) % 60;
- mac_hwclk(1, &now);
- return 0;
- }