| /* |
| * 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 <linux/genhd.h> |
| #include <linux/rtc.h> |
| #include <linux/interrupt.h> |
| #include <linux/bcd.h> |
| |
| #include <asm/bootinfo.h> |
| #include <asm/bootinfo-vme.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> |
| |
| static void bvme6000_get_model(char *model); |
| extern void bvme6000_sched_init(irq_handler_t handler); |
| extern u32 bvme6000_gettimeoffset(void); |
| extern int bvme6000_hwclk (int, struct rtc_time *); |
| extern int bvme6000_set_clock_mmss (unsigned long); |
| extern void bvme6000_reset (void); |
| void bvme6000_set_vectors (void); |
| |
| /* Save tick handler routine pointer, will point to xtime_update() in |
| * kernel/timer/timekeeping.c, called via bvme6000_process_int() */ |
| |
| static irq_handler_t tick_handler; |
| |
| |
| int __init 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); |
| } |
| |
| /* |
| * This function is called during kernel startup to initialize |
| * the bvme6000 IRQ handling routines. |
| */ |
| static void __init bvme6000_init_IRQ(void) |
| { |
| m68k_setup_user_interrupt(VEC_USER, 192); |
| } |
| |
| 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; |
| arch_gettimeoffset = bvme6000_gettimeoffset; |
| mach_hwclk = bvme6000_hwclk; |
| mach_set_clock_mmss = bvme6000_set_clock_mmss; |
| mach_reset = bvme6000_reset; |
| mach_get_model = bvme6000_get_model; |
| |
| 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) |
| { |
| 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) |
| { |
| 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); |
| } |
| |
| /* |
| * 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 (irq_handler_t timer_routine) |
| { |
| 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... |
| */ |
| |
| u32 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; |
| u32 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 * 1000; |
| } |
| |
| /* |
| * 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; |
| } |
| |