config.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:13k
- /*
- * arch/m68k/bvme6000/config.c
- *
- * Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
- *
- * Based on:
- *
- * linux/amiga/config.c
- *
- * Copyright (C) 1993 Hamish Macdonald
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file README.legal in the main directory of this archive
- * for more details.
- */
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/tty.h>
- #include <linux/console.h>
- #include <linux/linkage.h>
- #include <linux/init.h>
- #include <linux/major.h>
- #include <asm/bootinfo.h>
- #include <asm/system.h>
- #include <asm/pgtable.h>
- #include <asm/setup.h>
- #include <asm/irq.h>
- #include <asm/traps.h>
- #include <asm/rtc.h>
- #include <asm/machdep.h>
- #include <asm/bvme6000hw.h>
- extern void bvme6000_process_int (int level, struct pt_regs *regs);
- extern void bvme6000_init_IRQ (void);
- extern void bvme6000_free_irq (unsigned int, void *);
- extern int bvme6000_get_irq_list (char *);
- extern void bvme6000_enable_irq (unsigned int);
- extern void bvme6000_disable_irq (unsigned int);
- static void bvme6000_get_model(char *model);
- static int bvme6000_get_hardware_list(char *buffer);
- extern int bvme6000_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
- extern void bvme6000_sched_init(void (*handler)(int, void *, struct pt_regs *));
- extern int bvme6000_keyb_init(void);
- extern int bvme6000_kbdrate (struct kbd_repeat *);
- extern unsigned long bvme6000_gettimeoffset (void);
- extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour,
- int *min, int *sec);
- extern int bvme6000_hwclk (int, struct hwclk_time *);
- extern int bvme6000_set_clock_mmss (unsigned long);
- extern void bvme6000_check_partition (struct gendisk *hd, unsigned int dev);
- extern void bvme6000_mksound( unsigned int count, unsigned int ticks );
- extern void bvme6000_reset (void);
- extern void bvme6000_waitbut(void);
- void bvme6000_set_vectors (void);
- static unsigned char bcd2bin (unsigned char b);
- static unsigned char bin2bcd (unsigned char b);
- /* Save tick handler routine pointer, will point to do_timer() in
- * kernel/sched.c, called via bvme6000_process_int() */
- static void (*tick_handler)(int, void *, struct pt_regs *);
- int bvme6000_parse_bootinfo(const struct bi_record *bi)
- {
- if (bi->tag == BI_VME_TYPE)
- return 0;
- else
- return 1;
- }
- int bvme6000_kbdrate (struct kbd_repeat *k)
- {
- return 0;
- }
- void bvme6000_mksound( unsigned int count, unsigned int ticks )
- {
- }
- void bvme6000_reset()
- {
- volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
- printk ("rnnCalled bvme6000_resetrn"
- "rrrrrrrrrrrrrrrrrr");
- /* The string of returns is to delay the reset until the whole
- * message is output. */
- /* Enable the watchdog, via PIT port C bit 4 */
- pit->pcddr |= 0x10; /* WDOG enable */
- while(1)
- ;
- }
- static void bvme6000_get_model(char *model)
- {
- sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
- }
- /* No hardware options on BVME6000? */
- static int bvme6000_get_hardware_list(char *buffer)
- {
- *buffer = ' ';
- return 0;
- }
- void __init config_bvme6000(void)
- {
- volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
- /* Board type is only set by newer versions of vmelilo/tftplilo */
- if (!vme_brdtype) {
- if (m68k_cputype == CPU_68060)
- vme_brdtype = VME_TYPE_BVME6000;
- else
- vme_brdtype = VME_TYPE_BVME4000;
- }
- #if 0
- /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
- * debugger. Note trap_init() will splat the abort vector, but
- * bvme6000_init_IRQ() will put it back again. Hopefully. */
- bvme6000_set_vectors();
- #endif
- mach_max_dma_address = 0xffffffff;
- mach_sched_init = bvme6000_sched_init;
- mach_keyb_init = bvme6000_keyb_init;
- mach_kbdrate = bvme6000_kbdrate;
- mach_init_IRQ = bvme6000_init_IRQ;
- mach_gettimeoffset = bvme6000_gettimeoffset;
- mach_gettod = bvme6000_gettod;
- mach_hwclk = bvme6000_hwclk;
- mach_set_clock_mmss = bvme6000_set_clock_mmss;
- /* mach_mksound = bvme6000_mksound; */
- mach_reset = bvme6000_reset;
- mach_free_irq = bvme6000_free_irq;
- mach_process_int = bvme6000_process_int;
- mach_get_irq_list = bvme6000_get_irq_list;
- mach_request_irq = bvme6000_request_irq;
- enable_irq = bvme6000_enable_irq;
- disable_irq = bvme6000_disable_irq;
- mach_get_model = bvme6000_get_model;
- mach_get_hardware_list = bvme6000_get_hardware_list;
- printk ("Board is %sconfigured as a System Controllern",
- *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
- /* Now do the PIT configuration */
- pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */
- pit->psrr = 0x18; /* PIACK and PIRQ fucntions enabled */
- pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */
- pit->padr = 0x00; /* Just to be tidy! */
- pit->paddr = 0x00; /* All inputs for now (safest) */
- pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */
- pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
- /* PRI, SYSCON?, Level3, SCC clks from xtal */
- pit->pbddr = 0xf3; /* Mostly outputs */
- pit->pcdr = 0x01; /* PA transceiver disabled */
- pit->pcddr = 0x03; /* WDOG disable */
- /* Disable snooping for Ethernet and VME accesses */
- bvme_acr_addrctl = 0;
- }
- void bvme6000_abort_int (int irq, void *dev_id, struct pt_regs *fp)
- {
- unsigned long *new = (unsigned long *)vectors;
- unsigned long *old = (unsigned long *)0xf8000000;
- /* Wait for button release */
- while (*config_reg_ptr & BVME_ABORT_STATUS)
- ;
- *(new+4) = *(old+4); /* Illegal instruction */
- *(new+9) = *(old+9); /* Trace */
- *(new+47) = *(old+47); /* Trap #15 */
- *(new+0x1f) = *(old+0x1f); /* ABORT switch */
- }
- static void bvme6000_timer_int (int irq, void *dev_id, struct pt_regs *fp)
- {
- volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
- unsigned char msr = rtc->msr & 0xc0;
- rtc->msr = msr | 0x20; /* Ack the interrupt */
- tick_handler(irq, dev_id, fp);
- }
- /*
- * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
- * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low.
- * So, when reading the elapsed time, you should read timer1,
- * subtract it from 39999, and then add 40000 if T1 is high.
- * That gives you the number of 125ns ticks in to the 10ms period,
- * so divide by 8 to get the microsecond result.
- */
- void bvme6000_sched_init (void (*timer_routine)(int, void *, struct pt_regs *))
- {
- volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
- unsigned char msr = rtc->msr & 0xc0;
- rtc->msr = 0; /* Ensure timer registers accessible */
- tick_handler = timer_routine;
- if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
- "timer", bvme6000_timer_int))
- panic ("Couldn't register timer int");
- rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */
- rtc->t1msb = 39999 >> 8;
- rtc->t1lsb = 39999 & 0xff;
- rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */
- rtc->msr = 0x40; /* Access int.cntrl, etc */
- rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */
- rtc->irr_icr1 = 0;
- rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */
- rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */
- rtc->msr = 0; /* Access timer 1 control */
- rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */
- rtc->msr = msr;
- if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
- "abort", bvme6000_abort_int))
- panic ("Couldn't register abort int");
- }
- /* This is always executed with interrupts disabled. */
- /*
- * NOTE: Don't accept any readings within 5us of rollover, as
- * the T1INT bit may be a little slow getting set. There is also
- * a fault in the chip, meaning that reads may produce invalid
- * results...
- */
- unsigned long bvme6000_gettimeoffset (void)
- {
- volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
- volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
- unsigned char msr = rtc->msr & 0xc0;
- unsigned char t1int, t1op;
- unsigned long v = 800000, ov;
- rtc->msr = 0; /* Ensure timer registers accessible */
- do {
- ov = v;
- t1int = rtc->msr & 0x20;
- t1op = pit->pcdr & 0x04;
- rtc->t1cr_omr |= 0x40; /* Latch timer1 */
- v = rtc->t1msb << 8; /* Read timer1 */
- v |= rtc->t1lsb; /* Read timer1 */
- } while (t1int != (rtc->msr & 0x20) ||
- t1op != (pit->pcdr & 0x04) ||
- abs(ov-v) > 80 ||
- v > 39960);
- v = 39999 - v;
- if (!t1op) /* If in second half cycle.. */
- v += 40000;
- v /= 8; /* Convert ticks to microseconds */
- if (t1int)
- v += 10000; /* Int pending, + 10ms */
- rtc->msr = msr;
- return v;
- }
- extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour,
- int *min, int *sec)
- {
- volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
- unsigned char msr = rtc->msr & 0xc0;
- rtc->msr = 0; /* Ensure clock accessible */
- do { /* Loop until we get a reading with a stable seconds field */
- *sec = bcd2bin (rtc->bcd_sec);
- *min = bcd2bin (rtc->bcd_min);
- *hour = bcd2bin (rtc->bcd_hr);
- *day = bcd2bin (rtc->bcd_dom);
- *mon = bcd2bin (rtc->bcd_mth);
- *year = bcd2bin (rtc->bcd_year);
- } while (bcd2bin (rtc->bcd_sec) != *sec);
- rtc->msr = msr;
- }
- static unsigned char bcd2bin (unsigned char b)
- {
- return ((b>>4)*10 + (b&15));
- }
- static unsigned char bin2bcd (unsigned char b)
- {
- return (((b/10)*16) + (b%10));
- }
- /*
- * Looks like op is non-zero for setting the clock, and zero for
- * reading the clock.
- *
- * struct hwclk_time {
- * unsigned sec; 0..59
- * unsigned min; 0..59
- * unsigned hour; 0..23
- * unsigned day; 1..31
- * unsigned mon; 0..11
- * unsigned year; 00...
- * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set
- * };
- */
- int bvme6000_hwclk(int op, struct hwclk_time *t)
- {
- volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
- unsigned char msr = rtc->msr & 0xc0;
- rtc->msr = 0x40; /* Ensure clock and real-time-mode-register
- * are accessible */
- if (op)
- { /* Write.... */
- rtc->t0cr_rtmr = t->year%4;
- rtc->bcd_tenms = 0;
- rtc->bcd_sec = bin2bcd(t->sec);
- rtc->bcd_min = bin2bcd(t->min);
- rtc->bcd_hr = bin2bcd(t->hour);
- rtc->bcd_dom = bin2bcd(t->day);
- rtc->bcd_mth = bin2bcd(t->mon + 1);
- rtc->bcd_year = bin2bcd(t->year%100);
- if (t->wday >= 0)
- rtc->bcd_dow = bin2bcd(t->wday+1);
- rtc->t0cr_rtmr = t->year%4 | 0x08;
- }
- else
- { /* Read.... */
- do {
- t->sec = bcd2bin(rtc->bcd_sec);
- t->min = bcd2bin(rtc->bcd_min);
- t->hour = bcd2bin(rtc->bcd_hr);
- t->day = bcd2bin(rtc->bcd_dom);
- t->mon = bcd2bin(rtc->bcd_mth)-1;
- t->year = bcd2bin(rtc->bcd_year);
- if (t->year < 70)
- t->year += 100;
- t->wday = bcd2bin(rtc->bcd_dow)-1;
- } while (t->sec != bcd2bin(rtc->bcd_sec));
- }
- rtc->msr = msr;
- return 0;
- }
- /*
- * Set the minutes and seconds from seconds value 'nowtime'. Fail if
- * clock is out by > 30 minutes. Logic lifted from atari code.
- * Algorithm is to wait for the 10ms register to change, and then to
- * wait a short while, and then set it.
- */
- int bvme6000_set_clock_mmss (unsigned long nowtime)
- {
- int retval = 0;
- short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
- unsigned char rtc_minutes, rtc_tenms;
- volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
- unsigned char msr = rtc->msr & 0xc0;
- unsigned long flags;
- volatile int i;
- rtc->msr = 0; /* Ensure clock accessible */
- rtc_minutes = bcd2bin (rtc->bcd_min);
- if ((rtc_minutes < real_minutes
- ? real_minutes - rtc_minutes
- : rtc_minutes - real_minutes) < 30)
- {
- save_flags(flags);
- cli();
- rtc_tenms = rtc->bcd_tenms;
- while (rtc_tenms == rtc->bcd_tenms)
- ;
- for (i = 0; i < 1000; i++)
- ;
- rtc->bcd_min = bin2bcd(real_minutes);
- rtc->bcd_sec = bin2bcd(real_seconds);
- restore_flags(flags);
- }
- else
- retval = -1;
- rtc->msr = msr;
- return retval;
- }
- int bvme6000_keyb_init (void)
- {
- return 0;
- }
- /*------------------- Serial console stuff ------------------------*/
- static void bvme_scc_write(struct console *co, const char *str, unsigned cnt);
- void bvme6000_init_console_port (struct console *co, int cflag)
- {
- co->write = bvme_scc_write;
- }
- static void scc_delay (void)
- {
- int n;
- volatile int trash;
- for (n = 0; n < 20; n++)
- trash = n;
- }
- static void scc_write (char ch)
- {
- volatile char *p = (volatile char *)BVME_SCC_A_ADDR;
- do {
- scc_delay();
- }
- while (!(*p & 4));
- scc_delay();
- *p = 8;
- scc_delay();
- *p = ch;
- }
- static void bvme_scc_write (struct console *co, const char *str, unsigned count)
- {
- unsigned long flags;
- save_flags(flags);
- cli();
- while (count--)
- {
- if (*str == 'n')
- scc_write ('r');
- scc_write (*str++);
- }
- restore_flags(flags);
- }