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/clocksource.h> 22 #include <linux/console.h> 23 #include <linux/linkage.h> 24 #include <linux/init.h> 25 #include <linux/major.h> 26 #include <linux/genhd.h> 27 #include <linux/rtc.h> 28 #include <linux/interrupt.h> 29 #include <linux/bcd.h> 30 31 #include <asm/bootinfo.h> 32 #include <asm/bootinfo-vme.h> 33 #include <asm/byteorder.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 int bvme6000_hwclk (int, struct rtc_time *); 43 extern void bvme6000_reset (void); 44 void bvme6000_set_vectors (void); 45 46 47 int __init bvme6000_parse_bootinfo(const struct bi_record *bi) 48 { 49 if (be16_to_cpu(bi->tag) == BI_VME_TYPE) 50 return 0; 51 else 52 return 1; 53 } 54 55 void bvme6000_reset(void) 56 { 57 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 58 59 pr_info("\r\n\nCalled bvme6000_reset\r\n" 60 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r"); 61 /* The string of returns is to delay the reset until the whole 62 * message is output. */ 63 /* Enable the watchdog, via PIT port C bit 4 */ 64 65 pit->pcddr |= 0x10; /* WDOG enable */ 66 67 while(1) 68 ; 69 } 70 71 static void bvme6000_get_model(char *model) 72 { 73 sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4); 74 } 75 76 /* 77 * This function is called during kernel startup to initialize 78 * the bvme6000 IRQ handling routines. 79 */ 80 static void __init bvme6000_init_IRQ(void) 81 { 82 m68k_setup_user_interrupt(VEC_USER, 192); 83 } 84 85 void __init config_bvme6000(void) 86 { 87 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 88 89 /* Board type is only set by newer versions of vmelilo/tftplilo */ 90 if (!vme_brdtype) { 91 if (m68k_cputype == CPU_68060) 92 vme_brdtype = VME_TYPE_BVME6000; 93 else 94 vme_brdtype = VME_TYPE_BVME4000; 95 } 96 #if 0 97 /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug 98 * debugger. Note trap_init() will splat the abort vector, but 99 * bvme6000_init_IRQ() will put it back again. Hopefully. */ 100 101 bvme6000_set_vectors(); 102 #endif 103 104 mach_max_dma_address = 0xffffffff; 105 mach_sched_init = bvme6000_sched_init; 106 mach_init_IRQ = bvme6000_init_IRQ; 107 mach_hwclk = bvme6000_hwclk; 108 mach_reset = bvme6000_reset; 109 mach_get_model = bvme6000_get_model; 110 111 pr_info("Board is %sconfigured as a System Controller\n", 112 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not "); 113 114 /* Now do the PIT configuration */ 115 116 pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */ 117 pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */ 118 pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */ 119 pit->padr = 0x00; /* Just to be tidy! */ 120 pit->paddr = 0x00; /* All inputs for now (safest) */ 121 pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */ 122 pit->pbdr = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40); 123 /* PRI, SYSCON?, Level3, SCC clks from xtal */ 124 pit->pbddr = 0xf3; /* Mostly outputs */ 125 pit->pcdr = 0x01; /* PA transceiver disabled */ 126 pit->pcddr = 0x03; /* WDOG disable */ 127 128 /* Disable snooping for Ethernet and VME accesses */ 129 130 bvme_acr_addrctl = 0; 131 } 132 133 134 irqreturn_t bvme6000_abort_int (int irq, void *dev_id) 135 { 136 unsigned long *new = (unsigned long *)vectors; 137 unsigned long *old = (unsigned long *)0xf8000000; 138 139 /* Wait for button release */ 140 while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS) 141 ; 142 143 *(new+4) = *(old+4); /* Illegal instruction */ 144 *(new+9) = *(old+9); /* Trace */ 145 *(new+47) = *(old+47); /* Trap #15 */ 146 *(new+0x1f) = *(old+0x1f); /* ABORT switch */ 147 return IRQ_HANDLED; 148 } 149 150 static u64 bvme6000_read_clk(struct clocksource *cs); 151 152 static struct clocksource bvme6000_clk = { 153 .name = "rtc", 154 .rating = 250, 155 .read = bvme6000_read_clk, 156 .mask = CLOCKSOURCE_MASK(32), 157 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 158 }; 159 160 static u32 clk_total, clk_offset; 161 162 #define RTC_TIMER_CLOCK_FREQ 8000000 163 #define RTC_TIMER_CYCLES (RTC_TIMER_CLOCK_FREQ / HZ) 164 #define RTC_TIMER_COUNT ((RTC_TIMER_CYCLES / 2) - 1) 165 166 static irqreturn_t bvme6000_timer_int (int irq, void *dev_id) 167 { 168 irq_handler_t timer_routine = dev_id; 169 unsigned long flags; 170 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 171 unsigned char msr; 172 173 local_irq_save(flags); 174 msr = rtc->msr & 0xc0; 175 rtc->msr = msr | 0x20; /* Ack the interrupt */ 176 clk_total += RTC_TIMER_CYCLES; 177 clk_offset = 0; 178 timer_routine(0, NULL); 179 local_irq_restore(flags); 180 181 return IRQ_HANDLED; 182 } 183 184 /* 185 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms 186 * (40000 x 125ns). It will interrupt every 10ms, when T1 goes low. 187 * So, when reading the elapsed time, you should read timer1, 188 * subtract it from 39999, and then add 40000 if T1 is high. 189 * That gives you the number of 125ns ticks in to the 10ms period, 190 * so divide by 8 to get the microsecond result. 191 */ 192 193 void bvme6000_sched_init (irq_handler_t timer_routine) 194 { 195 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 196 unsigned char msr = rtc->msr & 0xc0; 197 198 rtc->msr = 0; /* Ensure timer registers accessible */ 199 200 if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, IRQF_TIMER, "timer", 201 timer_routine)) 202 panic ("Couldn't register timer int"); 203 204 rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */ 205 rtc->t1msb = RTC_TIMER_COUNT >> 8; 206 rtc->t1lsb = RTC_TIMER_COUNT & 0xff; 207 rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */ 208 rtc->msr = 0x40; /* Access int.cntrl, etc */ 209 rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */ 210 rtc->irr_icr1 = 0; 211 rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */ 212 rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */ 213 rtc->msr = 0; /* Access timer 1 control */ 214 rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */ 215 216 rtc->msr = msr; 217 218 clocksource_register_hz(&bvme6000_clk, RTC_TIMER_CLOCK_FREQ); 219 220 if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0, 221 "abort", bvme6000_abort_int)) 222 panic ("Couldn't register abort int"); 223 } 224 225 226 /* 227 * NOTE: Don't accept any readings within 5us of rollover, as 228 * the T1INT bit may be a little slow getting set. There is also 229 * a fault in the chip, meaning that reads may produce invalid 230 * results... 231 */ 232 233 static u64 bvme6000_read_clk(struct clocksource *cs) 234 { 235 unsigned long flags; 236 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 237 volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE; 238 unsigned char msr, msb; 239 unsigned char t1int, t1op; 240 u32 v = 800000, ov; 241 242 local_irq_save(flags); 243 244 msr = rtc->msr & 0xc0; 245 rtc->msr = 0; /* Ensure timer registers accessible */ 246 247 do { 248 ov = v; 249 t1int = rtc->msr & 0x20; 250 t1op = pit->pcdr & 0x04; 251 rtc->t1cr_omr |= 0x40; /* Latch timer1 */ 252 msb = rtc->t1msb; /* Read timer1 */ 253 v = (msb << 8) | rtc->t1lsb; /* Read timer1 */ 254 } while (t1int != (rtc->msr & 0x20) || 255 t1op != (pit->pcdr & 0x04) || 256 abs(ov-v) > 80 || 257 v > RTC_TIMER_COUNT - (RTC_TIMER_COUNT / 100)); 258 259 v = RTC_TIMER_COUNT - v; 260 if (!t1op) /* If in second half cycle.. */ 261 v += RTC_TIMER_CYCLES / 2; 262 if (msb > 0 && t1int) 263 clk_offset = RTC_TIMER_CYCLES; 264 rtc->msr = msr; 265 266 v += clk_offset + clk_total; 267 268 local_irq_restore(flags); 269 270 return v; 271 } 272 273 /* 274 * Looks like op is non-zero for setting the clock, and zero for 275 * reading the clock. 276 * 277 * struct hwclk_time { 278 * unsigned sec; 0..59 279 * unsigned min; 0..59 280 * unsigned hour; 0..23 281 * unsigned day; 1..31 282 * unsigned mon; 0..11 283 * unsigned year; 00... 284 * int wday; 0..6, 0 is Sunday, -1 means unknown/don't set 285 * }; 286 */ 287 288 int bvme6000_hwclk(int op, struct rtc_time *t) 289 { 290 volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE; 291 unsigned char msr = rtc->msr & 0xc0; 292 293 rtc->msr = 0x40; /* Ensure clock and real-time-mode-register 294 * are accessible */ 295 if (op) 296 { /* Write.... */ 297 rtc->t0cr_rtmr = t->tm_year%4; 298 rtc->bcd_tenms = 0; 299 rtc->bcd_sec = bin2bcd(t->tm_sec); 300 rtc->bcd_min = bin2bcd(t->tm_min); 301 rtc->bcd_hr = bin2bcd(t->tm_hour); 302 rtc->bcd_dom = bin2bcd(t->tm_mday); 303 rtc->bcd_mth = bin2bcd(t->tm_mon + 1); 304 rtc->bcd_year = bin2bcd(t->tm_year%100); 305 if (t->tm_wday >= 0) 306 rtc->bcd_dow = bin2bcd(t->tm_wday+1); 307 rtc->t0cr_rtmr = t->tm_year%4 | 0x08; 308 } 309 else 310 { /* Read.... */ 311 do { 312 t->tm_sec = bcd2bin(rtc->bcd_sec); 313 t->tm_min = bcd2bin(rtc->bcd_min); 314 t->tm_hour = bcd2bin(rtc->bcd_hr); 315 t->tm_mday = bcd2bin(rtc->bcd_dom); 316 t->tm_mon = bcd2bin(rtc->bcd_mth)-1; 317 t->tm_year = bcd2bin(rtc->bcd_year); 318 if (t->tm_year < 70) 319 t->tm_year += 100; 320 t->tm_wday = bcd2bin(rtc->bcd_dow)-1; 321 } while (t->tm_sec != bcd2bin(rtc->bcd_sec)); 322 } 323 324 rtc->msr = msr; 325 326 return 0; 327 } 328