1/* 2 * arch/m68k/bvme6000/config.c 3 * 4 * Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk] 5 * 6 * Based on: 7 * 8 * linux/amiga/config.c 9 * 10 * Copyright (C) 1993 Hamish Macdonald 11 * 12 * This file is subject to the terms and conditions of the GNU General Public 13 * License. See the file README.legal in the main directory of this archive 14 * for more details. 15 */ 16 17#include <linux/types.h> 18#include <linux/kernel.h> 19#include <linux/mm.h> 20#include <linux/tty.h> 21#include <linux/console.h> 22#include <linux/linkage.h> 23#include <linux/init.h> 24#include <linux/major.h> 25#include <linux/genhd.h> 26#include <linux/rtc.h> 27#include <linux/interrupt.h> 28#include <linux/bcd.h> 29 30#include <asm/bootinfo.h> 31#include <asm/system.h> 32#include <asm/pgtable.h> 33#include <asm/setup.h> 34#include <asm/irq.h> 35#include <asm/traps.h> 36#include <asm/rtc.h> 37#include <asm/machdep.h> 38#include <asm/bvme6000hw.h> 39 40static void bvme6000_get_model(char *model); 41extern void bvme6000_sched_init(irq_handler_t handler); 42extern unsigned long bvme6000_gettimeoffset (void); 43extern int bvme6000_hwclk (int, struct rtc_time *); 44extern int bvme6000_set_clock_mmss (unsigned long); 45extern void bvme6000_reset (void); 46void bvme6000_set_vectors (void); 47 48/* Save tick handler routine pointer, will point to do_timer() in 49 * kernel/sched.c, called via bvme6000_process_int() */ 50 51static irq_handler_t tick_handler; 52 53 54int bvme6000_parse_bootinfo(const struct bi_record *bi) 55{ 56 if (bi->tag == BI_VME_TYPE) 57 return 0; 58 else 59 return 1; 60} 61 62void bvme6000_reset(void) 63{ 64 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 65 66 printk ("\r\n\nCalled bvme6000_reset\r\n" 67 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r"); 68 /* The string of returns is to delay the reset until the whole 69 * message is output. */ 70 /* Enable the watchdog, via PIT port C bit 4 */ 71 72 pit->pcddr |= 0x10; /* WDOG enable */ 73 74 while(1) 75 ; 76} 77 78static void bvme6000_get_model(char *model) 79{ 80 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4); 81} 82 83/* 84 * This function is called during kernel startup to initialize 85 * the bvme6000 IRQ handling routines. 86 */ 87static void __init bvme6000_init_IRQ(void) 88{ 89 m68k_setup_user_interrupt(VEC_USER, 192, NULL); 90} 91 92void __init config_bvme6000(void) 93{ 94 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 95 96 /* Board type is only set by newer versions of vmelilo/tftplilo */ 97 if (!vme_brdtype) { 98 if (m68k_cputype == CPU_68060) 99 vme_brdtype = VME_TYPE_BVME6000; 100 else 101 vme_brdtype = VME_TYPE_BVME4000; 102 } 103 104 mach_max_dma_address = 0xffffffff; 105 mach_sched_init = bvme6000_sched_init; 106 mach_init_IRQ = bvme6000_init_IRQ; 107 mach_gettimeoffset = bvme6000_gettimeoffset; 108 mach_hwclk = bvme6000_hwclk; 109 mach_set_clock_mmss = bvme6000_set_clock_mmss; 110 mach_reset = bvme6000_reset; 111 mach_get_model = bvme6000_get_model; 112 113 printk ("Board is %sconfigured as a System Controller\n", 114 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not "); 115 116 /* Now do the PIT configuration */ 117 118 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */ 119 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */ 120 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */ 121 pit->padr = 0x00; /* Just to be tidy! */ 122 pit->paddr = 0x00; /* All inputs for now (safest) */ 123 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */ 124 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40); 125 /* PRI, SYSCON?, Level3, SCC clks from xtal */ 126 pit->pbddr = 0xf3; /* Mostly outputs */ 127 pit->pcdr = 0x01; /* PA transceiver disabled */ 128 pit->pcddr = 0x03; /* WDOG disable */ 129 130 /* Disable snooping for Ethernet and VME accesses */ 131 132 bvme_acr_addrctl = 0; 133} 134 135 136irqreturn_t bvme6000_abort_int (int irq, void *dev_id) 137{ 138 unsigned long *new = (unsigned long *)vectors; 139 unsigned long *old = (unsigned long *)0xf8000000; 140 141 /* Wait for button release */ 142 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS) 143 ; 144 145 *(new+4) = *(old+4); /* Illegal instruction */ 146 *(new+9) = *(old+9); /* Trace */ 147 *(new+47) = *(old+47); /* Trap #15 */ 148 *(new+0x1f) = *(old+0x1f); /* ABORT switch */ 149 return IRQ_HANDLED; 150} 151 152 153static irqreturn_t bvme6000_timer_int (int irq, void *dev_id) 154{ 155 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 156 unsigned char msr = rtc->msr & 0xc0; 157 158 rtc->msr = msr | 0x20; /* Ack the interrupt */ 159 160 return tick_handler(irq, dev_id); 161} 162 163/* 164 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms 165 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low. 166 * So, when reading the elapsed time, you should read timer1, 167 * subtract it from 39999, and then add 40000 if T1 is high. 168 * That gives you the number of 125ns ticks in to the 10ms period, 169 * so divide by 8 to get the microsecond result. 170 */ 171 172void bvme6000_sched_init (irq_handler_t timer_routine) 173{ 174 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 175 unsigned char msr = rtc->msr & 0xc0; 176 177 rtc->msr = 0; /* Ensure timer registers accessible */ 178 179 tick_handler = timer_routine; 180 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0, 181 "timer", bvme6000_timer_int)) 182 panic ("Couldn't register timer int"); 183 184 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */ 185 rtc->t1msb = 39999 >> 8; 186 rtc->t1lsb = 39999 & 0xff; 187 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */ 188 rtc->msr = 0x40; /* Access int.cntrl, etc */ 189 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */ 190 rtc->irr_icr1 = 0; 191 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */ 192 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */ 193 rtc->msr = 0; /* Access timer 1 control */ 194 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */ 195 196 rtc->msr = msr; 197 198 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0, 199 "abort", bvme6000_abort_int)) 200 panic ("Couldn't register abort int"); 201} 202 203 204/* This is always executed with interrupts disabled. */ 205 206/* 207 * NOTE: Don't accept any readings within 5us of rollover, as 208 * the T1INT bit may be a little slow getting set. There is also 209 * a fault in the chip, meaning that reads may produce invalid 210 * results... 211 */ 212 213unsigned long bvme6000_gettimeoffset (void) 214{ 215 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 216 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 217 unsigned char msr = rtc->msr & 0xc0; 218 unsigned char t1int, t1op; 219 unsigned long v = 800000, ov; 220 221 rtc->msr = 0; /* Ensure timer registers accessible */ 222 223 do { 224 ov = v; 225 t1int = rtc->msr & 0x20; 226 t1op = pit->pcdr & 0x04; 227 rtc->t1cr_omr |= 0x40; /* Latch timer1 */ 228 v = rtc->t1msb << 8; /* Read timer1 */ 229 v |= rtc->t1lsb; /* Read timer1 */ 230 } while (t1int != (rtc->msr & 0x20) || 231 t1op != (pit->pcdr & 0x04) || 232 abs(ov-v) > 80 || 233 v > 39960); 234 235 v = 39999 - v; 236 if (!t1op) /* If in second half cycle.. */ 237 v += 40000; 238 v /= 8; /* Convert ticks to microseconds */ 239 if (t1int) 240 v += 10000; /* Int pending, + 10ms */ 241 rtc->msr = msr; 242 243 return v; 244} 245 246/* 247 * Looks like op is non-zero for setting the clock, and zero for 248 * reading the clock. 249 * 250 * struct hwclk_time { 251 * unsigned sec; 0..59 252 * unsigned min; 0..59 253 * unsigned hour; 0..23 254 * unsigned day; 1..31 255 * unsigned mon; 0..11 256 * unsigned year; 00... 257 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set 258 * }; 259 */ 260 261int bvme6000_hwclk(int op, struct rtc_time *t) 262{ 263 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 264 unsigned char msr = rtc->msr & 0xc0; 265 266 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register 267 * are accessible */ 268 if (op) 269 { /* Write.... */ 270 rtc->t0cr_rtmr = t->tm_year%4; 271 rtc->bcd_tenms = 0; 272 rtc->bcd_sec = bin2bcd(t->tm_sec); 273 rtc->bcd_min = bin2bcd(t->tm_min); 274 rtc->bcd_hr = bin2bcd(t->tm_hour); 275 rtc->bcd_dom = bin2bcd(t->tm_mday); 276 rtc->bcd_mth = bin2bcd(t->tm_mon + 1); 277 rtc->bcd_year = bin2bcd(t->tm_year%100); 278 if (t->tm_wday >= 0) 279 rtc->bcd_dow = bin2bcd(t->tm_wday+1); 280 rtc->t0cr_rtmr = t->tm_year%4 | 0x08; 281 } 282 else 283 { /* Read.... */ 284 do { 285 t->tm_sec = bcd2bin(rtc->bcd_sec); 286 t->tm_min = bcd2bin(rtc->bcd_min); 287 t->tm_hour = bcd2bin(rtc->bcd_hr); 288 t->tm_mday = bcd2bin(rtc->bcd_dom); 289 t->tm_mon = bcd2bin(rtc->bcd_mth)-1; 290 t->tm_year = bcd2bin(rtc->bcd_year); 291 if (t->tm_year < 70) 292 t->tm_year += 100; 293 t->tm_wday = bcd2bin(rtc->bcd_dow)-1; 294 } while (t->tm_sec != bcd2bin(rtc->bcd_sec)); 295 } 296 297 rtc->msr = msr; 298 299 return 0; 300} 301 302/* 303 * Set the minutes and seconds from seconds value 'nowtime'. Fail if 304 * clock is out by > 30 minutes. Logic lifted from atari code. 305 * Algorithm is to wait for the 10ms register to change, and then to 306 * wait a short while, and then set it. 307 */ 308 309int bvme6000_set_clock_mmss (unsigned long nowtime) 310{ 311 int retval = 0; 312 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60; 313 unsigned char rtc_minutes, rtc_tenms; 314 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 315 unsigned char msr = rtc->msr & 0xc0; 316 unsigned long flags; 317 volatile int i; 318 319 rtc->msr = 0; /* Ensure clock accessible */ 320 rtc_minutes = bcd2bin (rtc->bcd_min); 321 322 if ((rtc_minutes < real_minutes 323 ? real_minutes - rtc_minutes 324 : rtc_minutes - real_minutes) < 30) 325 { 326 local_irq_save(flags); 327 rtc_tenms = rtc->bcd_tenms; 328 while (rtc_tenms == rtc->bcd_tenms) 329 ; 330 for (i = 0; i < 1000; i++) 331 ; 332 rtc->bcd_min = bin2bcd(real_minutes); 333 rtc->bcd_sec = bin2bcd(real_seconds); 334 local_irq_restore(flags); 335 } 336 else 337 retval = -1; 338 339 rtc->msr = msr; 340 341 return retval; 342} 343