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/rtc.h> 26 27#include <asm/bootinfo.h> 28#include <asm/system.h> 29#include <asm/pgtable.h> 30#include <asm/setup.h> 31#include <asm/irq.h> 32#include <asm/traps.h> 33#include <asm/rtc.h> 34#include <asm/machdep.h> 35#include <asm/bvme6000hw.h> 36 37extern void bvme6000_process_int (int level, struct pt_regs *regs); 38extern void bvme6000_init_IRQ (void); 39extern void bvme6000_free_irq (unsigned int, void *); 40extern int bvme6000_get_irq_list (char *); 41extern void bvme6000_enable_irq (unsigned int); 42extern void bvme6000_disable_irq (unsigned int); 43static void bvme6000_get_model(char *model); 44static int bvme6000_get_hardware_list(char *buffer); 45extern int bvme6000_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id); 46extern void bvme6000_sched_init(void (*handler)(int, void *, struct pt_regs *)); 47extern int bvme6000_keyb_init(void); 48extern int bvme6000_kbdrate (struct kbd_repeat *); 49extern unsigned long bvme6000_gettimeoffset (void); 50extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour, 51 int *min, int *sec); 52extern int bvme6000_hwclk (int, struct rtc_time *); 53extern int bvme6000_set_clock_mmss (unsigned long); 54extern void bvme6000_check_partition (struct gendisk *hd, unsigned int dev); 55extern void bvme6000_mksound( unsigned int count, unsigned int ticks ); 56extern void bvme6000_reset (void); 57extern void bvme6000_waitbut(void); 58void bvme6000_set_vectors (void); 59 60static unsigned char bcd2bin (unsigned char b); 61static unsigned char bin2bcd (unsigned char b); 62 63/* Save tick handler routine pointer, will point to do_timer() in 64 * kernel/sched.c, called via bvme6000_process_int() */ 65 66static void (*tick_handler)(int, void *, struct pt_regs *); 67 68 69int bvme6000_parse_bootinfo(const struct bi_record *bi) 70{ 71 if (bi->tag == BI_VME_TYPE) 72 return 0; 73 else 74 return 1; 75} 76 77int bvme6000_kbdrate (struct kbd_repeat *k) 78{ 79 return 0; 80} 81 82void bvme6000_mksound( unsigned int count, unsigned int ticks ) 83{ 84} 85 86void bvme6000_reset() 87{ 88 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 89 90 printk ("\r\n\nCalled bvme6000_reset\r\n" 91 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r"); 92 /* The string of returns is to delay the reset until the whole 93 * message is output. */ 94 /* Enable the watchdog, via PIT port C bit 4 */ 95 96 pit->pcddr |= 0x10; /* WDOG enable */ 97 98 while(1) 99 ; 100} 101 102static void bvme6000_get_model(char *model) 103{ 104 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4); 105} 106 107 108/* No hardware options on BVME6000? */ 109 110static int bvme6000_get_hardware_list(char *buffer) 111{ 112 *buffer = '\0'; 113 return 0; 114} 115 116 117void __init config_bvme6000(void) 118{ 119 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 120 121 /* Board type is only set by newer versions of vmelilo/tftplilo */ 122 if (!vme_brdtype) { 123 if (m68k_cputype == CPU_68060) 124 vme_brdtype = VME_TYPE_BVME6000; 125 else 126 vme_brdtype = VME_TYPE_BVME4000; 127 } 128 129 mach_max_dma_address = 0xffffffff; 130 mach_sched_init = bvme6000_sched_init; 131#ifdef CONFIG_VT 132 mach_keyb_init = bvme6000_keyb_init; 133 mach_kbdrate = bvme6000_kbdrate; 134#endif 135 mach_init_IRQ = bvme6000_init_IRQ; 136 mach_gettimeoffset = bvme6000_gettimeoffset; 137 mach_gettod = bvme6000_gettod; 138 mach_hwclk = bvme6000_hwclk; 139 mach_set_clock_mmss = bvme6000_set_clock_mmss; 140/* mach_mksound = bvme6000_mksound; */ 141 mach_reset = bvme6000_reset; 142 mach_free_irq = bvme6000_free_irq; 143 mach_process_int = bvme6000_process_int; 144 mach_get_irq_list = bvme6000_get_irq_list; 145 mach_request_irq = bvme6000_request_irq; 146 enable_irq = bvme6000_enable_irq; 147 disable_irq = bvme6000_disable_irq; 148 mach_get_model = bvme6000_get_model; 149 mach_get_hardware_list = bvme6000_get_hardware_list; 150 151 printk ("Board is %sconfigured as a System Controller\n", 152 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not "); 153 154 /* Now do the PIT configuration */ 155 156 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */ 157 pit->psrr = 0x18; /* PIACK and PIRQ fucntions enabled */ 158 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */ 159 pit->padr = 0x00; /* Just to be tidy! */ 160 pit->paddr = 0x00; /* All inputs for now (safest) */ 161 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */ 162 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40); 163 /* PRI, SYSCON?, Level3, SCC clks from xtal */ 164 pit->pbddr = 0xf3; /* Mostly outputs */ 165 pit->pcdr = 0x01; /* PA transceiver disabled */ 166 pit->pcddr = 0x03; /* WDOG disable */ 167 168 /* Disable snooping for Ethernet and VME accesses */ 169 170 bvme_acr_addrctl = 0; 171} 172 173 174void bvme6000_abort_int (int irq, void *dev_id, struct pt_regs *fp) 175{ 176 unsigned long *new = (unsigned long *)vectors; 177 unsigned long *old = (unsigned long *)0xf8000000; 178 179 /* Wait for button release */ 180 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS) 181 ; 182 183 *(new+4) = *(old+4); /* Illegal instruction */ 184 *(new+9) = *(old+9); /* Trace */ 185 *(new+47) = *(old+47); /* Trap #15 */ 186 *(new+0x1f) = *(old+0x1f); /* ABORT switch */ 187} 188 189 190static void bvme6000_timer_int (int irq, void *dev_id, struct pt_regs *fp) 191{ 192 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 193 unsigned char msr = rtc->msr & 0xc0; 194 195 rtc->msr = msr | 0x20; /* Ack the interrupt */ 196 197 tick_handler(irq, dev_id, fp); 198} 199 200/* 201 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms 202 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low. 203 * So, when reading the elapsed time, you should read timer1, 204 * subtract it from 39999, and then add 40000 if T1 is high. 205 * That gives you the number of 125ns ticks in to the 10ms period, 206 * so divide by 8 to get the microsecond result. 207 */ 208 209void bvme6000_sched_init (void (*timer_routine)(int, void *, struct pt_regs *)) 210{ 211 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 212 unsigned char msr = rtc->msr & 0xc0; 213 214 rtc->msr = 0; /* Ensure timer registers accessible */ 215 216 tick_handler = timer_routine; 217 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0, 218 "timer", bvme6000_timer_int)) 219 panic ("Couldn't register timer int"); 220 221 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */ 222 rtc->t1msb = 39999 >> 8; 223 rtc->t1lsb = 39999 & 0xff; 224 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */ 225 rtc->msr = 0x40; /* Access int.cntrl, etc */ 226 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */ 227 rtc->irr_icr1 = 0; 228 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */ 229 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */ 230 rtc->msr = 0; /* Access timer 1 control */ 231 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */ 232 233 rtc->msr = msr; 234 235 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0, 236 "abort", bvme6000_abort_int)) 237 panic ("Couldn't register abort int"); 238} 239 240 241/* This is always executed with interrupts disabled. */ 242 243/* 244 * NOTE: Don't accept any readings within 5us of rollover, as 245 * the T1INT bit may be a little slow getting set. There is also 246 * a fault in the chip, meaning that reads may produce invalid 247 * results... 248 */ 249 250unsigned long bvme6000_gettimeoffset (void) 251{ 252 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 253 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 254 unsigned char msr = rtc->msr & 0xc0; 255 unsigned char t1int, t1op; 256 unsigned long v = 800000, ov; 257 258 rtc->msr = 0; /* Ensure timer registers accessible */ 259 260 do { 261 ov = v; 262 t1int = rtc->msr & 0x20; 263 t1op = pit->pcdr & 0x04; 264 rtc->t1cr_omr |= 0x40; /* Latch timer1 */ 265 v = rtc->t1msb << 8; /* Read timer1 */ 266 v |= rtc->t1lsb; /* Read timer1 */ 267 } while (t1int != (rtc->msr & 0x20) || 268 t1op != (pit->pcdr & 0x04) || 269 abs(ov-v) > 80 || 270 v > 39960); 271 272 v = 39999 - v; 273 if (!t1op) /* If in second half cycle.. */ 274 v += 40000; 275 v /= 8; /* Convert ticks to microseconds */ 276 if (t1int) 277 v += 10000; /* Int pending, + 10ms */ 278 rtc->msr = msr; 279 280 return v; 281} 282 283extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour, 284 int *min, int *sec) 285{ 286 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 287 unsigned char msr = rtc->msr & 0xc0; 288 289 rtc->msr = 0; /* Ensure clock accessible */ 290 291 do { /* Loop until we get a reading with a stable seconds field */ 292 *sec = bcd2bin (rtc->bcd_sec); 293 *min = bcd2bin (rtc->bcd_min); 294 *hour = bcd2bin (rtc->bcd_hr); 295 *day = bcd2bin (rtc->bcd_dom); 296 *mon = bcd2bin (rtc->bcd_mth); 297 *year = bcd2bin (rtc->bcd_year); 298 } while (bcd2bin (rtc->bcd_sec) != *sec); 299 300 rtc->msr = msr; 301} 302 303static unsigned char bcd2bin (unsigned char b) 304{ 305 return ((b>>4)*10 + (b&15)); 306} 307 308static unsigned char bin2bcd (unsigned char b) 309{ 310 return (((b/10)*16) + (b%10)); 311} 312 313 314/* 315 * Looks like op is non-zero for setting the clock, and zero for 316 * reading the clock. 317 * 318 * struct hwclk_time { 319 * unsigned sec; 0..59 320 * unsigned min; 0..59 321 * unsigned hour; 0..23 322 * unsigned day; 1..31 323 * unsigned mon; 0..11 324 * unsigned year; 00... 325 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set 326 * }; 327 */ 328 329int bvme6000_hwclk(int op, struct rtc_time *t) 330{ 331 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 332 unsigned char msr = rtc->msr & 0xc0; 333 334 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register 335 * are accessible */ 336 if (op) 337 { /* Write.... */ 338 rtc->t0cr_rtmr = t->tm_year%4; 339 rtc->bcd_tenms = 0; 340 rtc->bcd_sec = bin2bcd(t->tm_sec); 341 rtc->bcd_min = bin2bcd(t->tm_min); 342 rtc->bcd_hr = bin2bcd(t->tm_hour); 343 rtc->bcd_dom = bin2bcd(t->tm_mday); 344 rtc->bcd_mth = bin2bcd(t->tm_mon + 1); 345 rtc->bcd_year = bin2bcd(t->tm_year%100); 346 if (t->tm_wday >= 0) 347 rtc->bcd_dow = bin2bcd(t->tm_wday+1); 348 rtc->t0cr_rtmr = t->tm_year%4 | 0x08; 349 } 350 else 351 { /* Read.... */ 352 do { 353 t->tm_sec = bcd2bin(rtc->bcd_sec); 354 t->tm_min = bcd2bin(rtc->bcd_min); 355 t->tm_hour = bcd2bin(rtc->bcd_hr); 356 t->tm_mday = bcd2bin(rtc->bcd_dom); 357 t->tm_mon = bcd2bin(rtc->bcd_mth)-1; 358 t->tm_year = bcd2bin(rtc->bcd_year); 359 if (t->tm_year < 70) 360 t->tm_year += 100; 361 t->tm_wday = bcd2bin(rtc->bcd_dow)-1; 362 } while (t->tm_sec != bcd2bin(rtc->bcd_sec)); 363 } 364 365 rtc->msr = msr; 366 367 return 0; 368} 369 370/* 371 * Set the minutes and seconds from seconds value 'nowtime'. Fail if 372 * clock is out by > 30 minutes. Logic lifted from atari code. 373 * Algorithm is to wait for the 10ms register to change, and then to 374 * wait a short while, and then set it. 375 */ 376 377int bvme6000_set_clock_mmss (unsigned long nowtime) 378{ 379 int retval = 0; 380 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60; 381 unsigned char rtc_minutes, rtc_tenms; 382 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 383 unsigned char msr = rtc->msr & 0xc0; 384 unsigned long flags; 385 volatile int i; 386 387 rtc->msr = 0; /* Ensure clock accessible */ 388 rtc_minutes = bcd2bin (rtc->bcd_min); 389 390 if ((rtc_minutes < real_minutes 391 ? real_minutes - rtc_minutes 392 : rtc_minutes - real_minutes) < 30) 393 { 394 save_flags(flags); 395 cli(); 396 rtc_tenms = rtc->bcd_tenms; 397 while (rtc_tenms == rtc->bcd_tenms) 398 ; 399 for (i = 0; i < 1000; i++) 400 ; 401 rtc->bcd_min = bin2bcd(real_minutes); 402 rtc->bcd_sec = bin2bcd(real_seconds); 403 restore_flags(flags); 404 } 405 else 406 retval = -1; 407 408 rtc->msr = msr; 409 410 return retval; 411} 412 413 414int bvme6000_keyb_init (void) 415{ 416 return 0; 417} 418