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/bootinfo-vme.h> 32 #include <asm/byteorder.h> 33 #include <asm/pgtable.h> 34 #include <asm/setup.h> 35 #include <asm/irq.h> 36 #include <asm/traps.h> 37 #include <asm/machdep.h> 38 #include <asm/bvme6000hw.h> 39 40 static void bvme6000_get_model(char *model); 41 extern void bvme6000_sched_init(irq_handler_t handler); 42 extern u32 bvme6000_gettimeoffset(void); 43 extern int bvme6000_hwclk (int, struct rtc_time *); 44 extern int bvme6000_set_clock_mmss (unsigned long); 45 extern void bvme6000_reset (void); 46 void bvme6000_set_vectors (void); 47 48 /* Save tick handler routine pointer, will point to xtime_update() in 49 * kernel/timer/timekeeping.c, called via bvme6000_process_int() */ 50 51 static irq_handler_t tick_handler; 52 53 54 int __init bvme6000_parse_bootinfo(const struct bi_record *bi) 55 { 56 if (be16_to_cpu(bi->tag) == BI_VME_TYPE) 57 return 0; 58 else 59 return 1; 60 } 61 62 void 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 78 static 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 */ 87 static void __init bvme6000_init_IRQ(void) 88 { 89 m68k_setup_user_interrupt(VEC_USER, 192); 90 } 91 92 void __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 #if 0 104 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug 105 * debugger. Note trap_init() will splat the abort vector, but 106 * bvme6000_init_IRQ() will put it back again. Hopefully. */ 107 108 bvme6000_set_vectors(); 109 #endif 110 111 mach_max_dma_address = 0xffffffff; 112 mach_sched_init = bvme6000_sched_init; 113 mach_init_IRQ = bvme6000_init_IRQ; 114 arch_gettimeoffset = bvme6000_gettimeoffset; 115 mach_hwclk = bvme6000_hwclk; 116 mach_set_clock_mmss = bvme6000_set_clock_mmss; 117 mach_reset = bvme6000_reset; 118 mach_get_model = bvme6000_get_model; 119 120 printk ("Board is %sconfigured as a System Controller\n", 121 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not "); 122 123 /* Now do the PIT configuration */ 124 125 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */ 126 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */ 127 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */ 128 pit->padr = 0x00; /* Just to be tidy! */ 129 pit->paddr = 0x00; /* All inputs for now (safest) */ 130 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */ 131 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40); 132 /* PRI, SYSCON?, Level3, SCC clks from xtal */ 133 pit->pbddr = 0xf3; /* Mostly outputs */ 134 pit->pcdr = 0x01; /* PA transceiver disabled */ 135 pit->pcddr = 0x03; /* WDOG disable */ 136 137 /* Disable snooping for Ethernet and VME accesses */ 138 139 bvme_acr_addrctl = 0; 140 } 141 142 143 irqreturn_t bvme6000_abort_int (int irq, void *dev_id) 144 { 145 unsigned long *new = (unsigned long *)vectors; 146 unsigned long *old = (unsigned long *)0xf8000000; 147 148 /* Wait for button release */ 149 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS) 150 ; 151 152 *(new+4) = *(old+4); /* Illegal instruction */ 153 *(new+9) = *(old+9); /* Trace */ 154 *(new+47) = *(old+47); /* Trap #15 */ 155 *(new+0x1f) = *(old+0x1f); /* ABORT switch */ 156 return IRQ_HANDLED; 157 } 158 159 160 static irqreturn_t bvme6000_timer_int (int irq, void *dev_id) 161 { 162 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 163 unsigned char msr = rtc->msr & 0xc0; 164 165 rtc->msr = msr | 0x20; /* Ack the interrupt */ 166 167 return tick_handler(irq, dev_id); 168 } 169 170 /* 171 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms 172 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low. 173 * So, when reading the elapsed time, you should read timer1, 174 * subtract it from 39999, and then add 40000 if T1 is high. 175 * That gives you the number of 125ns ticks in to the 10ms period, 176 * so divide by 8 to get the microsecond result. 177 */ 178 179 void bvme6000_sched_init (irq_handler_t timer_routine) 180 { 181 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 182 unsigned char msr = rtc->msr & 0xc0; 183 184 rtc->msr = 0; /* Ensure timer registers accessible */ 185 186 tick_handler = timer_routine; 187 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0, 188 "timer", bvme6000_timer_int)) 189 panic ("Couldn't register timer int"); 190 191 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */ 192 rtc->t1msb = 39999 >> 8; 193 rtc->t1lsb = 39999 & 0xff; 194 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */ 195 rtc->msr = 0x40; /* Access int.cntrl, etc */ 196 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */ 197 rtc->irr_icr1 = 0; 198 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */ 199 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */ 200 rtc->msr = 0; /* Access timer 1 control */ 201 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */ 202 203 rtc->msr = msr; 204 205 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0, 206 "abort", bvme6000_abort_int)) 207 panic ("Couldn't register abort int"); 208 } 209 210 211 /* This is always executed with interrupts disabled. */ 212 213 /* 214 * NOTE: Don't accept any readings within 5us of rollover, as 215 * the T1INT bit may be a little slow getting set. There is also 216 * a fault in the chip, meaning that reads may produce invalid 217 * results... 218 */ 219 220 u32 bvme6000_gettimeoffset(void) 221 { 222 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 223 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 224 unsigned char msr = rtc->msr & 0xc0; 225 unsigned char t1int, t1op; 226 u32 v = 800000, ov; 227 228 rtc->msr = 0; /* Ensure timer registers accessible */ 229 230 do { 231 ov = v; 232 t1int = rtc->msr & 0x20; 233 t1op = pit->pcdr & 0x04; 234 rtc->t1cr_omr |= 0x40; /* Latch timer1 */ 235 v = rtc->t1msb << 8; /* Read timer1 */ 236 v |= rtc->t1lsb; /* Read timer1 */ 237 } while (t1int != (rtc->msr & 0x20) || 238 t1op != (pit->pcdr & 0x04) || 239 abs(ov-v) > 80 || 240 v > 39960); 241 242 v = 39999 - v; 243 if (!t1op) /* If in second half cycle.. */ 244 v += 40000; 245 v /= 8; /* Convert ticks to microseconds */ 246 if (t1int) 247 v += 10000; /* Int pending, + 10ms */ 248 rtc->msr = msr; 249 250 return v * 1000; 251 } 252 253 /* 254 * Looks like op is non-zero for setting the clock, and zero for 255 * reading the clock. 256 * 257 * struct hwclk_time { 258 * unsigned sec; 0..59 259 * unsigned min; 0..59 260 * unsigned hour; 0..23 261 * unsigned day; 1..31 262 * unsigned mon; 0..11 263 * unsigned year; 00... 264 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set 265 * }; 266 */ 267 268 int bvme6000_hwclk(int op, struct rtc_time *t) 269 { 270 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 271 unsigned char msr = rtc->msr & 0xc0; 272 273 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register 274 * are accessible */ 275 if (op) 276 { /* Write.... */ 277 rtc->t0cr_rtmr = t->tm_year%4; 278 rtc->bcd_tenms = 0; 279 rtc->bcd_sec = bin2bcd(t->tm_sec); 280 rtc->bcd_min = bin2bcd(t->tm_min); 281 rtc->bcd_hr = bin2bcd(t->tm_hour); 282 rtc->bcd_dom = bin2bcd(t->tm_mday); 283 rtc->bcd_mth = bin2bcd(t->tm_mon + 1); 284 rtc->bcd_year = bin2bcd(t->tm_year%100); 285 if (t->tm_wday >= 0) 286 rtc->bcd_dow = bin2bcd(t->tm_wday+1); 287 rtc->t0cr_rtmr = t->tm_year%4 | 0x08; 288 } 289 else 290 { /* Read.... */ 291 do { 292 t->tm_sec = bcd2bin(rtc->bcd_sec); 293 t->tm_min = bcd2bin(rtc->bcd_min); 294 t->tm_hour = bcd2bin(rtc->bcd_hr); 295 t->tm_mday = bcd2bin(rtc->bcd_dom); 296 t->tm_mon = bcd2bin(rtc->bcd_mth)-1; 297 t->tm_year = bcd2bin(rtc->bcd_year); 298 if (t->tm_year < 70) 299 t->tm_year += 100; 300 t->tm_wday = bcd2bin(rtc->bcd_dow)-1; 301 } while (t->tm_sec != bcd2bin(rtc->bcd_sec)); 302 } 303 304 rtc->msr = msr; 305 306 return 0; 307 } 308 309 /* 310 * Set the minutes and seconds from seconds value 'nowtime'. Fail if 311 * clock is out by > 30 minutes. Logic lifted from atari code. 312 * Algorithm is to wait for the 10ms register to change, and then to 313 * wait a short while, and then set it. 314 */ 315 316 int bvme6000_set_clock_mmss (unsigned long nowtime) 317 { 318 int retval = 0; 319 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60; 320 unsigned char rtc_minutes, rtc_tenms; 321 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 322 unsigned char msr = rtc->msr & 0xc0; 323 unsigned long flags; 324 volatile int i; 325 326 rtc->msr = 0; /* Ensure clock accessible */ 327 rtc_minutes = bcd2bin (rtc->bcd_min); 328 329 if ((rtc_minutes < real_minutes 330 ? real_minutes - rtc_minutes 331 : rtc_minutes - real_minutes) < 30) 332 { 333 local_irq_save(flags); 334 rtc_tenms = rtc->bcd_tenms; 335 while (rtc_tenms == rtc->bcd_tenms) 336 ; 337 for (i = 0; i < 1000; i++) 338 ; 339 rtc->bcd_min = bin2bcd(real_minutes); 340 rtc->bcd_sec = bin2bcd(real_seconds); 341 local_irq_restore(flags); 342 } 343 else 344 retval = -1; 345 346 rtc->msr = msr; 347 348 return retval; 349 } 350 351