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 29#include <asm/bootinfo.h> 30#include <asm/system.h> 31#include <asm/pgtable.h> 32#include <asm/setup.h> 33#include <asm/irq.h> 34#include <asm/traps.h> 35#include <asm/rtc.h> 36#include <asm/machdep.h> 37#include <asm/bvme6000hw.h> 38 39static void bvme6000_get_model(char *model); 40static int bvme6000_get_hardware_list(char *buffer); 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); 46extern void bvme6000_waitbut(void); 47void bvme6000_set_vectors (void); 48 49static unsigned char bcd2bin (unsigned char b); 50static unsigned char bin2bcd (unsigned char b); 51 52/* Save tick handler routine pointer, will point to do_timer() in 53 * kernel/sched.c, called via bvme6000_process_int() */ 54 55static irq_handler_t tick_handler; 56 57 58int bvme6000_parse_bootinfo(const struct bi_record *bi) 59{ 60 if (bi->tag == BI_VME_TYPE) 61 return 0; 62 else 63 return 1; 64} 65 66void bvme6000_reset(void) 67{ 68 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 69 70 printk ("\r\n\nCalled bvme6000_reset\r\n" 71 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r"); 72 /* The string of returns is to delay the reset until the whole 73 * message is output. */ 74 /* Enable the watchdog, via PIT port C bit 4 */ 75 76 pit->pcddr |= 0x10; /* WDOG enable */ 77 78 while(1) 79 ; 80} 81 82static void bvme6000_get_model(char *model) 83{ 84 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4); 85} 86 87 88/* No hardware options on BVME6000? */ 89 90static int bvme6000_get_hardware_list(char *buffer) 91{ 92 *buffer = '\0'; 93 return 0; 94} 95 96/* 97 * This function is called during kernel startup to initialize 98 * the bvme6000 IRQ handling routines. 99 */ 100static void bvme6000_init_IRQ(void) 101{ 102 m68k_setup_user_interrupt(VEC_USER, 192, NULL); 103} 104 105void __init config_bvme6000(void) 106{ 107 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 108 109 /* Board type is only set by newer versions of vmelilo/tftplilo */ 110 if (!vme_brdtype) { 111 if (m68k_cputype == CPU_68060) 112 vme_brdtype = VME_TYPE_BVME6000; 113 else 114 vme_brdtype = VME_TYPE_BVME4000; 115 } 116 117 mach_max_dma_address = 0xffffffff; 118 mach_sched_init = bvme6000_sched_init; 119 mach_init_IRQ = bvme6000_init_IRQ; 120 mach_gettimeoffset = bvme6000_gettimeoffset; 121 mach_hwclk = bvme6000_hwclk; 122 mach_set_clock_mmss = bvme6000_set_clock_mmss; 123 mach_reset = bvme6000_reset; 124 mach_get_model = bvme6000_get_model; 125 mach_get_hardware_list = bvme6000_get_hardware_list; 126 127 printk ("Board is %sconfigured as a System Controller\n", 128 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not "); 129 130 /* Now do the PIT configuration */ 131 132 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */ 133 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */ 134 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */ 135 pit->padr = 0x00; /* Just to be tidy! */ 136 pit->paddr = 0x00; /* All inputs for now (safest) */ 137 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */ 138 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40); 139 /* PRI, SYSCON?, Level3, SCC clks from xtal */ 140 pit->pbddr = 0xf3; /* Mostly outputs */ 141 pit->pcdr = 0x01; /* PA transceiver disabled */ 142 pit->pcddr = 0x03; /* WDOG disable */ 143 144 /* Disable snooping for Ethernet and VME accesses */ 145 146 bvme_acr_addrctl = 0; 147} 148 149 150irqreturn_t bvme6000_abort_int (int irq, void *dev_id) 151{ 152 unsigned long *new = (unsigned long *)vectors; 153 unsigned long *old = (unsigned long *)0xf8000000; 154 155 /* Wait for button release */ 156 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS) 157 ; 158 159 *(new+4) = *(old+4); /* Illegal instruction */ 160 *(new+9) = *(old+9); /* Trace */ 161 *(new+47) = *(old+47); /* Trap #15 */ 162 *(new+0x1f) = *(old+0x1f); /* ABORT switch */ 163 return IRQ_HANDLED; 164} 165 166 167static irqreturn_t bvme6000_timer_int (int irq, void *dev_id) 168{ 169 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 170 unsigned char msr = rtc->msr & 0xc0; 171 172 rtc->msr = msr | 0x20; /* Ack the interrupt */ 173 174 return tick_handler(irq, dev_id); 175} 176 177/* 178 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms 179 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low. 180 * So, when reading the elapsed time, you should read timer1, 181 * subtract it from 39999, and then add 40000 if T1 is high. 182 * That gives you the number of 125ns ticks in to the 10ms period, 183 * so divide by 8 to get the microsecond result. 184 */ 185 186void bvme6000_sched_init (irq_handler_t timer_routine) 187{ 188 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 189 unsigned char msr = rtc->msr & 0xc0; 190 191 rtc->msr = 0; /* Ensure timer registers accessible */ 192 193 tick_handler = timer_routine; 194 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0, 195 "timer", bvme6000_timer_int)) 196 panic ("Couldn't register timer int"); 197 198 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */ 199 rtc->t1msb = 39999 >> 8; 200 rtc->t1lsb = 39999 & 0xff; 201 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */ 202 rtc->msr = 0x40; /* Access int.cntrl, etc */ 203 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */ 204 rtc->irr_icr1 = 0; 205 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */ 206 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */ 207 rtc->msr = 0; /* Access timer 1 control */ 208 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */ 209 210 rtc->msr = msr; 211 212 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0, 213 "abort", bvme6000_abort_int)) 214 panic ("Couldn't register abort int"); 215} 216 217 218/* This is always executed with interrupts disabled. */ 219 220/* 221 * NOTE: Don't accept any readings within 5us of rollover, as 222 * the T1INT bit may be a little slow getting set. There is also 223 * a fault in the chip, meaning that reads may produce invalid 224 * results... 225 */ 226 227unsigned long bvme6000_gettimeoffset (void) 228{ 229 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 230 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 231 unsigned char msr = rtc->msr & 0xc0; 232 unsigned char t1int, t1op; 233 unsigned long v = 800000, ov; 234 235 rtc->msr = 0; /* Ensure timer registers accessible */ 236 237 do { 238 ov = v; 239 t1int = rtc->msr & 0x20; 240 t1op = pit->pcdr & 0x04; 241 rtc->t1cr_omr |= 0x40; /* Latch timer1 */ 242 v = rtc->t1msb << 8; /* Read timer1 */ 243 v |= rtc->t1lsb; /* Read timer1 */ 244 } while (t1int != (rtc->msr & 0x20) || 245 t1op != (pit->pcdr & 0x04) || 246 abs(ov-v) > 80 || 247 v > 39960); 248 249 v = 39999 - v; 250 if (!t1op) /* If in second half cycle.. */ 251 v += 40000; 252 v /= 8; /* Convert ticks to microseconds */ 253 if (t1int) 254 v += 10000; /* Int pending, + 10ms */ 255 rtc->msr = msr; 256 257 return v; 258} 259 260static unsigned char bcd2bin (unsigned char b) 261{ 262 return ((b>>4)*10 + (b&15)); 263} 264 265static unsigned char bin2bcd (unsigned char b) 266{ 267 return (((b/10)*16) + (b%10)); 268} 269 270 271/* 272 * Looks like op is non-zero for setting the clock, and zero for 273 * reading the clock. 274 * 275 * struct hwclk_time { 276 * unsigned sec; 0..59 277 * unsigned min; 0..59 278 * unsigned hour; 0..23 279 * unsigned day; 1..31 280 * unsigned mon; 0..11 281 * unsigned year; 00... 282 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set 283 * }; 284 */ 285 286int bvme6000_hwclk(int op, struct rtc_time *t) 287{ 288 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 289 unsigned char msr = rtc->msr & 0xc0; 290 291 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register 292 * are accessible */ 293 if (op) 294 { /* Write.... */ 295 rtc->t0cr_rtmr = t->tm_year%4; 296 rtc->bcd_tenms = 0; 297 rtc->bcd_sec = bin2bcd(t->tm_sec); 298 rtc->bcd_min = bin2bcd(t->tm_min); 299 rtc->bcd_hr = bin2bcd(t->tm_hour); 300 rtc->bcd_dom = bin2bcd(t->tm_mday); 301 rtc->bcd_mth = bin2bcd(t->tm_mon + 1); 302 rtc->bcd_year = bin2bcd(t->tm_year%100); 303 if (t->tm_wday >= 0) 304 rtc->bcd_dow = bin2bcd(t->tm_wday+1); 305 rtc->t0cr_rtmr = t->tm_year%4 | 0x08; 306 } 307 else 308 { /* Read.... */ 309 do { 310 t->tm_sec = bcd2bin(rtc->bcd_sec); 311 t->tm_min = bcd2bin(rtc->bcd_min); 312 t->tm_hour = bcd2bin(rtc->bcd_hr); 313 t->tm_mday = bcd2bin(rtc->bcd_dom); 314 t->tm_mon = bcd2bin(rtc->bcd_mth)-1; 315 t->tm_year = bcd2bin(rtc->bcd_year); 316 if (t->tm_year < 70) 317 t->tm_year += 100; 318 t->tm_wday = bcd2bin(rtc->bcd_dow)-1; 319 } while (t->tm_sec != bcd2bin(rtc->bcd_sec)); 320 } 321 322 rtc->msr = msr; 323 324 return 0; 325} 326 327/* 328 * Set the minutes and seconds from seconds value 'nowtime'. Fail if 329 * clock is out by > 30 minutes. Logic lifted from atari code. 330 * Algorithm is to wait for the 10ms register to change, and then to 331 * wait a short while, and then set it. 332 */ 333 334int bvme6000_set_clock_mmss (unsigned long nowtime) 335{ 336 int retval = 0; 337 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60; 338 unsigned char rtc_minutes, rtc_tenms; 339 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 340 unsigned char msr = rtc->msr & 0xc0; 341 unsigned long flags; 342 volatile int i; 343 344 rtc->msr = 0; /* Ensure clock accessible */ 345 rtc_minutes = bcd2bin (rtc->bcd_min); 346 347 if ((rtc_minutes < real_minutes 348 ? real_minutes - rtc_minutes 349 : rtc_minutes - real_minutes) < 30) 350 { 351 local_irq_save(flags); 352 rtc_tenms = rtc->bcd_tenms; 353 while (rtc_tenms == rtc->bcd_tenms) 354 ; 355 for (i = 0; i < 1000; i++) 356 ; 357 rtc->bcd_min = bin2bcd(real_minutes); 358 rtc->bcd_sec = bin2bcd(real_seconds); 359 local_irq_restore(flags); 360 } 361 else 362 retval = -1; 363 364 rtc->msr = msr; 365 366 return retval; 367} 368