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 39 extern irqreturn_t bvme6000_process_int (int level, struct pt_regs *regs); 40 extern void bvme6000_init_IRQ (void); 41 extern void bvme6000_free_irq (unsigned int, void *); 42 extern int show_bvme6000_interrupts(struct seq_file *, void *); 43 extern void bvme6000_enable_irq (unsigned int); 44 extern void bvme6000_disable_irq (unsigned int); 45 static void bvme6000_get_model(char *model); 46 static int bvme6000_get_hardware_list(char *buffer); 47 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); 48 extern void bvme6000_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *)); 49 extern unsigned long bvme6000_gettimeoffset (void); 50 extern int bvme6000_hwclk (int, struct rtc_time *); 51 extern int bvme6000_set_clock_mmss (unsigned long); 52 extern void bvme6000_reset (void); 53 extern void bvme6000_waitbut(void); 54 void bvme6000_set_vectors (void); 55 56 static unsigned char bcd2bin (unsigned char b); 57 static unsigned char bin2bcd (unsigned char b); 58 59 /* Save tick handler routine pointer, will point to do_timer() in 60 * kernel/sched.c, called via bvme6000_process_int() */ 61 62 static irqreturn_t (*tick_handler)(int, void *, struct pt_regs *); 63 64 65 int bvme6000_parse_bootinfo(const struct bi_record *bi) 66 { 67 if (bi->tag == BI_VME_TYPE) 68 return 0; 69 else 70 return 1; 71 } 72 73 void bvme6000_reset(void) 74 { 75 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 76 77 printk ("\r\n\nCalled bvme6000_reset\r\n" 78 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r"); 79 /* The string of returns is to delay the reset until the whole 80 * message is output. */ 81 /* Enable the watchdog, via PIT port C bit 4 */ 82 83 pit->pcddr |= 0x10; /* WDOG enable */ 84 85 while(1) 86 ; 87 } 88 89 static void bvme6000_get_model(char *model) 90 { 91 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4); 92 } 93 94 95 /* No hardware options on BVME6000? */ 96 97 static int bvme6000_get_hardware_list(char *buffer) 98 { 99 *buffer = '\0'; 100 return 0; 101 } 102 103 104 void __init config_bvme6000(void) 105 { 106 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 107 108 /* Board type is only set by newer versions of vmelilo/tftplilo */ 109 if (!vme_brdtype) { 110 if (m68k_cputype == CPU_68060) 111 vme_brdtype = VME_TYPE_BVME6000; 112 else 113 vme_brdtype = VME_TYPE_BVME4000; 114 } 115 #if 0 116 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug 117 * debugger. Note trap_init() will splat the abort vector, but 118 * bvme6000_init_IRQ() will put it back again. Hopefully. */ 119 120 bvme6000_set_vectors(); 121 #endif 122 123 mach_max_dma_address = 0xffffffff; 124 mach_sched_init = bvme6000_sched_init; 125 mach_init_IRQ = bvme6000_init_IRQ; 126 mach_gettimeoffset = bvme6000_gettimeoffset; 127 mach_hwclk = bvme6000_hwclk; 128 mach_set_clock_mmss = bvme6000_set_clock_mmss; 129 mach_reset = bvme6000_reset; 130 mach_free_irq = bvme6000_free_irq; 131 mach_process_int = bvme6000_process_int; 132 mach_get_irq_list = show_bvme6000_interrupts; 133 mach_request_irq = bvme6000_request_irq; 134 enable_irq = bvme6000_enable_irq; 135 disable_irq = bvme6000_disable_irq; 136 mach_get_model = bvme6000_get_model; 137 mach_get_hardware_list = bvme6000_get_hardware_list; 138 139 printk ("Board is %sconfigured as a System Controller\n", 140 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not "); 141 142 /* Now do the PIT configuration */ 143 144 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */ 145 pit->psrr = 0x18; /* PIACK and PIRQ fucntions enabled */ 146 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */ 147 pit->padr = 0x00; /* Just to be tidy! */ 148 pit->paddr = 0x00; /* All inputs for now (safest) */ 149 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */ 150 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40); 151 /* PRI, SYSCON?, Level3, SCC clks from xtal */ 152 pit->pbddr = 0xf3; /* Mostly outputs */ 153 pit->pcdr = 0x01; /* PA transceiver disabled */ 154 pit->pcddr = 0x03; /* WDOG disable */ 155 156 /* Disable snooping for Ethernet and VME accesses */ 157 158 bvme_acr_addrctl = 0; 159 } 160 161 162 irqreturn_t bvme6000_abort_int (int irq, void *dev_id, struct pt_regs *fp) 163 { 164 unsigned long *new = (unsigned long *)vectors; 165 unsigned long *old = (unsigned long *)0xf8000000; 166 167 /* Wait for button release */ 168 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS) 169 ; 170 171 *(new+4) = *(old+4); /* Illegal instruction */ 172 *(new+9) = *(old+9); /* Trace */ 173 *(new+47) = *(old+47); /* Trap #15 */ 174 *(new+0x1f) = *(old+0x1f); /* ABORT switch */ 175 return IRQ_HANDLED; 176 } 177 178 179 static irqreturn_t bvme6000_timer_int (int irq, void *dev_id, struct pt_regs *fp) 180 { 181 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 182 unsigned char msr = rtc->msr & 0xc0; 183 184 rtc->msr = msr | 0x20; /* Ack the interrupt */ 185 186 return tick_handler(irq, dev_id, fp); 187 } 188 189 /* 190 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms 191 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low. 192 * So, when reading the elapsed time, you should read timer1, 193 * subtract it from 39999, and then add 40000 if T1 is high. 194 * That gives you the number of 125ns ticks in to the 10ms period, 195 * so divide by 8 to get the microsecond result. 196 */ 197 198 void bvme6000_sched_init (irqreturn_t (*timer_routine)(int, void *, struct pt_regs *)) 199 { 200 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 201 unsigned char msr = rtc->msr & 0xc0; 202 203 rtc->msr = 0; /* Ensure timer registers accessible */ 204 205 tick_handler = timer_routine; 206 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0, 207 "timer", bvme6000_timer_int)) 208 panic ("Couldn't register timer int"); 209 210 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */ 211 rtc->t1msb = 39999 >> 8; 212 rtc->t1lsb = 39999 & 0xff; 213 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */ 214 rtc->msr = 0x40; /* Access int.cntrl, etc */ 215 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */ 216 rtc->irr_icr1 = 0; 217 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */ 218 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */ 219 rtc->msr = 0; /* Access timer 1 control */ 220 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */ 221 222 rtc->msr = msr; 223 224 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0, 225 "abort", bvme6000_abort_int)) 226 panic ("Couldn't register abort int"); 227 } 228 229 230 /* This is always executed with interrupts disabled. */ 231 232 /* 233 * NOTE: Don't accept any readings within 5us of rollover, as 234 * the T1INT bit may be a little slow getting set. There is also 235 * a fault in the chip, meaning that reads may produce invalid 236 * results... 237 */ 238 239 unsigned long bvme6000_gettimeoffset (void) 240 { 241 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 242 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 243 unsigned char msr = rtc->msr & 0xc0; 244 unsigned char t1int, t1op; 245 unsigned long v = 800000, ov; 246 247 rtc->msr = 0; /* Ensure timer registers accessible */ 248 249 do { 250 ov = v; 251 t1int = rtc->msr & 0x20; 252 t1op = pit->pcdr & 0x04; 253 rtc->t1cr_omr |= 0x40; /* Latch timer1 */ 254 v = rtc->t1msb << 8; /* Read timer1 */ 255 v |= rtc->t1lsb; /* Read timer1 */ 256 } while (t1int != (rtc->msr & 0x20) || 257 t1op != (pit->pcdr & 0x04) || 258 abs(ov-v) > 80 || 259 v > 39960); 260 261 v = 39999 - v; 262 if (!t1op) /* If in second half cycle.. */ 263 v += 40000; 264 v /= 8; /* Convert ticks to microseconds */ 265 if (t1int) 266 v += 10000; /* Int pending, + 10ms */ 267 rtc->msr = msr; 268 269 return v; 270 } 271 272 static unsigned char bcd2bin (unsigned char b) 273 { 274 return ((b>>4)*10 + (b&15)); 275 } 276 277 static unsigned char bin2bcd (unsigned char b) 278 { 279 return (((b/10)*16) + (b%10)); 280 } 281 282 283 /* 284 * Looks like op is non-zero for setting the clock, and zero for 285 * reading the clock. 286 * 287 * struct hwclk_time { 288 * unsigned sec; 0..59 289 * unsigned min; 0..59 290 * unsigned hour; 0..23 291 * unsigned day; 1..31 292 * unsigned mon; 0..11 293 * unsigned year; 00... 294 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set 295 * }; 296 */ 297 298 int bvme6000_hwclk(int op, struct rtc_time *t) 299 { 300 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 301 unsigned char msr = rtc->msr & 0xc0; 302 303 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register 304 * are accessible */ 305 if (op) 306 { /* Write.... */ 307 rtc->t0cr_rtmr = t->tm_year%4; 308 rtc->bcd_tenms = 0; 309 rtc->bcd_sec = bin2bcd(t->tm_sec); 310 rtc->bcd_min = bin2bcd(t->tm_min); 311 rtc->bcd_hr = bin2bcd(t->tm_hour); 312 rtc->bcd_dom = bin2bcd(t->tm_mday); 313 rtc->bcd_mth = bin2bcd(t->tm_mon + 1); 314 rtc->bcd_year = bin2bcd(t->tm_year%100); 315 if (t->tm_wday >= 0) 316 rtc->bcd_dow = bin2bcd(t->tm_wday+1); 317 rtc->t0cr_rtmr = t->tm_year%4 | 0x08; 318 } 319 else 320 { /* Read.... */ 321 do { 322 t->tm_sec = bcd2bin(rtc->bcd_sec); 323 t->tm_min = bcd2bin(rtc->bcd_min); 324 t->tm_hour = bcd2bin(rtc->bcd_hr); 325 t->tm_mday = bcd2bin(rtc->bcd_dom); 326 t->tm_mon = bcd2bin(rtc->bcd_mth)-1; 327 t->tm_year = bcd2bin(rtc->bcd_year); 328 if (t->tm_year < 70) 329 t->tm_year += 100; 330 t->tm_wday = bcd2bin(rtc->bcd_dow)-1; 331 } while (t->tm_sec != bcd2bin(rtc->bcd_sec)); 332 } 333 334 rtc->msr = msr; 335 336 return 0; 337 } 338 339 /* 340 * Set the minutes and seconds from seconds value 'nowtime'. Fail if 341 * clock is out by > 30 minutes. Logic lifted from atari code. 342 * Algorithm is to wait for the 10ms register to change, and then to 343 * wait a short while, and then set it. 344 */ 345 346 int bvme6000_set_clock_mmss (unsigned long nowtime) 347 { 348 int retval = 0; 349 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60; 350 unsigned char rtc_minutes, rtc_tenms; 351 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 352 unsigned char msr = rtc->msr & 0xc0; 353 unsigned long flags; 354 volatile int i; 355 356 rtc->msr = 0; /* Ensure clock accessible */ 357 rtc_minutes = bcd2bin (rtc->bcd_min); 358 359 if ((rtc_minutes < real_minutes 360 ? real_minutes - rtc_minutes 361 : rtc_minutes - real_minutes) < 30) 362 { 363 local_irq_save(flags); 364 rtc_tenms = rtc->bcd_tenms; 365 while (rtc_tenms == rtc->bcd_tenms) 366 ; 367 for (i = 0; i < 1000; i++) 368 ; 369 rtc->bcd_min = bin2bcd(real_minutes); 370 rtc->bcd_sec = bin2bcd(real_seconds); 371 local_irq_restore(flags); 372 } 373 else 374 retval = -1; 375 376 rtc->msr = msr; 377 378 return retval; 379 } 380 381