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/rtc.h> 38 #include <asm/machdep.h> 39 #include <asm/bvme6000hw.h> 40 41 static void bvme6000_get_model(char *model); 42 extern void bvme6000_sched_init(irq_handler_t handler); 43 extern u32 bvme6000_gettimeoffset(void); 44 extern int bvme6000_hwclk (int, struct rtc_time *); 45 extern int bvme6000_set_clock_mmss (unsigned long); 46 extern void bvme6000_reset (void); 47 void bvme6000_set_vectors (void); 48 49 /* Save tick handler routine pointer, will point to xtime_update() in 50 * kernel/timer/timekeeping.c, called via bvme6000_process_int() */ 51 52 static irq_handler_t tick_handler; 53 54 55 int __init bvme6000_parse_bootinfo(const struct bi_record *bi) 56 { 57 if (be16_to_cpu(bi->tag) == BI_VME_TYPE) 58 return 0; 59 else 60 return 1; 61 } 62 63 void bvme6000_reset(void) 64 { 65 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 66 67 printk ("\r\n\nCalled bvme6000_reset\r\n" 68 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r"); 69 /* The string of returns is to delay the reset until the whole 70 * message is output. */ 71 /* Enable the watchdog, via PIT port C bit 4 */ 72 73 pit->pcddr |= 0x10; /* WDOG enable */ 74 75 while(1) 76 ; 77 } 78 79 static void bvme6000_get_model(char *model) 80 { 81 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4); 82 } 83 84 /* 85 * This function is called during kernel startup to initialize 86 * the bvme6000 IRQ handling routines. 87 */ 88 static void __init bvme6000_init_IRQ(void) 89 { 90 m68k_setup_user_interrupt(VEC_USER, 192); 91 } 92 93 void __init config_bvme6000(void) 94 { 95 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 96 97 /* Board type is only set by newer versions of vmelilo/tftplilo */ 98 if (!vme_brdtype) { 99 if (m68k_cputype == CPU_68060) 100 vme_brdtype = VME_TYPE_BVME6000; 101 else 102 vme_brdtype = VME_TYPE_BVME4000; 103 } 104 #if 0 105 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug 106 * debugger. Note trap_init() will splat the abort vector, but 107 * bvme6000_init_IRQ() will put it back again. Hopefully. */ 108 109 bvme6000_set_vectors(); 110 #endif 111 112 mach_max_dma_address = 0xffffffff; 113 mach_sched_init = bvme6000_sched_init; 114 mach_init_IRQ = bvme6000_init_IRQ; 115 arch_gettimeoffset = bvme6000_gettimeoffset; 116 mach_hwclk = bvme6000_hwclk; 117 mach_set_clock_mmss = bvme6000_set_clock_mmss; 118 mach_reset = bvme6000_reset; 119 mach_get_model = bvme6000_get_model; 120 121 printk ("Board is %sconfigured as a System Controller\n", 122 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not "); 123 124 /* Now do the PIT configuration */ 125 126 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */ 127 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */ 128 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */ 129 pit->padr = 0x00; /* Just to be tidy! */ 130 pit->paddr = 0x00; /* All inputs for now (safest) */ 131 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */ 132 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40); 133 /* PRI, SYSCON?, Level3, SCC clks from xtal */ 134 pit->pbddr = 0xf3; /* Mostly outputs */ 135 pit->pcdr = 0x01; /* PA transceiver disabled */ 136 pit->pcddr = 0x03; /* WDOG disable */ 137 138 /* Disable snooping for Ethernet and VME accesses */ 139 140 bvme_acr_addrctl = 0; 141 } 142 143 144 irqreturn_t bvme6000_abort_int (int irq, void *dev_id) 145 { 146 unsigned long *new = (unsigned long *)vectors; 147 unsigned long *old = (unsigned long *)0xf8000000; 148 149 /* Wait for button release */ 150 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS) 151 ; 152 153 *(new+4) = *(old+4); /* Illegal instruction */ 154 *(new+9) = *(old+9); /* Trace */ 155 *(new+47) = *(old+47); /* Trap #15 */ 156 *(new+0x1f) = *(old+0x1f); /* ABORT switch */ 157 return IRQ_HANDLED; 158 } 159 160 161 static irqreturn_t bvme6000_timer_int (int irq, void *dev_id) 162 { 163 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 164 unsigned char msr = rtc->msr & 0xc0; 165 166 rtc->msr = msr | 0x20; /* Ack the interrupt */ 167 168 return tick_handler(irq, dev_id); 169 } 170 171 /* 172 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms 173 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low. 174 * So, when reading the elapsed time, you should read timer1, 175 * subtract it from 39999, and then add 40000 if T1 is high. 176 * That gives you the number of 125ns ticks in to the 10ms period, 177 * so divide by 8 to get the microsecond result. 178 */ 179 180 void bvme6000_sched_init (irq_handler_t timer_routine) 181 { 182 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 183 unsigned char msr = rtc->msr & 0xc0; 184 185 rtc->msr = 0; /* Ensure timer registers accessible */ 186 187 tick_handler = timer_routine; 188 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0, 189 "timer", bvme6000_timer_int)) 190 panic ("Couldn't register timer int"); 191 192 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */ 193 rtc->t1msb = 39999 >> 8; 194 rtc->t1lsb = 39999 & 0xff; 195 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */ 196 rtc->msr = 0x40; /* Access int.cntrl, etc */ 197 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */ 198 rtc->irr_icr1 = 0; 199 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */ 200 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */ 201 rtc->msr = 0; /* Access timer 1 control */ 202 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */ 203 204 rtc->msr = msr; 205 206 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0, 207 "abort", bvme6000_abort_int)) 208 panic ("Couldn't register abort int"); 209 } 210 211 212 /* This is always executed with interrupts disabled. */ 213 214 /* 215 * NOTE: Don't accept any readings within 5us of rollover, as 216 * the T1INT bit may be a little slow getting set. There is also 217 * a fault in the chip, meaning that reads may produce invalid 218 * results... 219 */ 220 221 u32 bvme6000_gettimeoffset(void) 222 { 223 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 224 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 225 unsigned char msr = rtc->msr & 0xc0; 226 unsigned char t1int, t1op; 227 u32 v = 800000, ov; 228 229 rtc->msr = 0; /* Ensure timer registers accessible */ 230 231 do { 232 ov = v; 233 t1int = rtc->msr & 0x20; 234 t1op = pit->pcdr & 0x04; 235 rtc->t1cr_omr |= 0x40; /* Latch timer1 */ 236 v = rtc->t1msb << 8; /* Read timer1 */ 237 v |= rtc->t1lsb; /* Read timer1 */ 238 } while (t1int != (rtc->msr & 0x20) || 239 t1op != (pit->pcdr & 0x04) || 240 abs(ov-v) > 80 || 241 v > 39960); 242 243 v = 39999 - v; 244 if (!t1op) /* If in second half cycle.. */ 245 v += 40000; 246 v /= 8; /* Convert ticks to microseconds */ 247 if (t1int) 248 v += 10000; /* Int pending, + 10ms */ 249 rtc->msr = msr; 250 251 return v * 1000; 252 } 253 254 /* 255 * Looks like op is non-zero for setting the clock, and zero for 256 * reading the clock. 257 * 258 * struct hwclk_time { 259 * unsigned sec; 0..59 260 * unsigned min; 0..59 261 * unsigned hour; 0..23 262 * unsigned day; 1..31 263 * unsigned mon; 0..11 264 * unsigned year; 00... 265 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set 266 * }; 267 */ 268 269 int bvme6000_hwclk(int op, struct rtc_time *t) 270 { 271 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 272 unsigned char msr = rtc->msr & 0xc0; 273 274 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register 275 * are accessible */ 276 if (op) 277 { /* Write.... */ 278 rtc->t0cr_rtmr = t->tm_year%4; 279 rtc->bcd_tenms = 0; 280 rtc->bcd_sec = bin2bcd(t->tm_sec); 281 rtc->bcd_min = bin2bcd(t->tm_min); 282 rtc->bcd_hr = bin2bcd(t->tm_hour); 283 rtc->bcd_dom = bin2bcd(t->tm_mday); 284 rtc->bcd_mth = bin2bcd(t->tm_mon + 1); 285 rtc->bcd_year = bin2bcd(t->tm_year%100); 286 if (t->tm_wday >= 0) 287 rtc->bcd_dow = bin2bcd(t->tm_wday+1); 288 rtc->t0cr_rtmr = t->tm_year%4 | 0x08; 289 } 290 else 291 { /* Read.... */ 292 do { 293 t->tm_sec = bcd2bin(rtc->bcd_sec); 294 t->tm_min = bcd2bin(rtc->bcd_min); 295 t->tm_hour = bcd2bin(rtc->bcd_hr); 296 t->tm_mday = bcd2bin(rtc->bcd_dom); 297 t->tm_mon = bcd2bin(rtc->bcd_mth)-1; 298 t->tm_year = bcd2bin(rtc->bcd_year); 299 if (t->tm_year < 70) 300 t->tm_year += 100; 301 t->tm_wday = bcd2bin(rtc->bcd_dow)-1; 302 } while (t->tm_sec != bcd2bin(rtc->bcd_sec)); 303 } 304 305 rtc->msr = msr; 306 307 return 0; 308 } 309 310 /* 311 * Set the minutes and seconds from seconds value 'nowtime'. Fail if 312 * clock is out by > 30 minutes. Logic lifted from atari code. 313 * Algorithm is to wait for the 10ms register to change, and then to 314 * wait a short while, and then set it. 315 */ 316 317 int bvme6000_set_clock_mmss (unsigned long nowtime) 318 { 319 int retval = 0; 320 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60; 321 unsigned char rtc_minutes, rtc_tenms; 322 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 323 unsigned char msr = rtc->msr & 0xc0; 324 unsigned long flags; 325 volatile int i; 326 327 rtc->msr = 0; /* Ensure clock accessible */ 328 rtc_minutes = bcd2bin (rtc->bcd_min); 329 330 if ((rtc_minutes < real_minutes 331 ? real_minutes - rtc_minutes 332 : rtc_minutes - real_minutes) < 30) 333 { 334 local_irq_save(flags); 335 rtc_tenms = rtc->bcd_tenms; 336 while (rtc_tenms == rtc->bcd_tenms) 337 ; 338 for (i = 0; i < 1000; i++) 339 ; 340 rtc->bcd_min = bin2bcd(real_minutes); 341 rtc->bcd_sec = bin2bcd(real_seconds); 342 local_irq_restore(flags); 343 } 344 else 345 retval = -1; 346 347 rtc->msr = msr; 348 349 return retval; 350 } 351 352