/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern irqreturn_t 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 show_bvme6000_interrupts(struct seq_file *, void *); 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, irqreturn_t (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id); extern void bvme6000_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *)); extern unsigned long bvme6000_gettimeoffset (void); extern int bvme6000_hwclk (int, struct rtc_time *); extern int bvme6000_set_clock_mmss (unsigned long); 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 irqreturn_t (*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; } void bvme6000_reset(void) { volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; printk ("\r\n\nCalled bvme6000_reset\r\n" "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r"); /* 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 = '\0'; 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_init_IRQ = bvme6000_init_IRQ; mach_gettimeoffset = bvme6000_gettimeoffset; mach_hwclk = bvme6000_hwclk; mach_set_clock_mmss = bvme6000_set_clock_mmss; mach_reset = bvme6000_reset; mach_free_irq = bvme6000_free_irq; mach_process_int = bvme6000_process_int; mach_get_irq_list = show_bvme6000_interrupts; 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 Controller\n", *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 functions 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; } irqreturn_t 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 (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & 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 */ return IRQ_HANDLED; } static irqreturn_t 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 */ return 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 (irqreturn_t (*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; } 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 rtc_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->tm_year%4; rtc->bcd_tenms = 0; rtc->bcd_sec = bin2bcd(t->tm_sec); rtc->bcd_min = bin2bcd(t->tm_min); rtc->bcd_hr = bin2bcd(t->tm_hour); rtc->bcd_dom = bin2bcd(t->tm_mday); rtc->bcd_mth = bin2bcd(t->tm_mon + 1); rtc->bcd_year = bin2bcd(t->tm_year%100); if (t->tm_wday >= 0) rtc->bcd_dow = bin2bcd(t->tm_wday+1); rtc->t0cr_rtmr = t->tm_year%4 | 0x08; } else { /* Read.... */ do { t->tm_sec = bcd2bin(rtc->bcd_sec); t->tm_min = bcd2bin(rtc->bcd_min); t->tm_hour = bcd2bin(rtc->bcd_hr); t->tm_mday = bcd2bin(rtc->bcd_dom); t->tm_mon = bcd2bin(rtc->bcd_mth)-1; t->tm_year = bcd2bin(rtc->bcd_year); if (t->tm_year < 70) t->tm_year += 100; t->tm_wday = bcd2bin(rtc->bcd_dow)-1; } while (t->tm_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) { local_irq_save(flags); 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); local_irq_restore(flags); } else retval = -1; rtc->msr = msr; return retval; }