config.c 4.4 KB

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  1. /*
  2. * arch/m68k/mvme147/config.c
  3. *
  4. * Copyright (C) 1996 Dave Frascone [[email protected]]
  5. * Cloned from Richard Hirst [[email protected]]
  6. *
  7. * Based on:
  8. *
  9. * Copyright (C) 1993 Hamish Macdonald
  10. *
  11. * This file is subject to the terms and conditions of the GNU General Public
  12. * License. See the file README.legal in the main directory of this archive
  13. * for more details.
  14. */
  15. #include <linux/types.h>
  16. #include <linux/kernel.h>
  17. #include <linux/mm.h>
  18. #include <linux/tty.h>
  19. #include <linux/clocksource.h>
  20. #include <linux/console.h>
  21. #include <linux/linkage.h>
  22. #include <linux/init.h>
  23. #include <linux/major.h>
  24. #include <linux/rtc.h>
  25. #include <linux/interrupt.h>
  26. #include <asm/bootinfo.h>
  27. #include <asm/bootinfo-vme.h>
  28. #include <asm/byteorder.h>
  29. #include <asm/setup.h>
  30. #include <asm/irq.h>
  31. #include <asm/traps.h>
  32. #include <asm/machdep.h>
  33. #include <asm/mvme147hw.h>
  34. #include <asm/config.h>
  35. static void mvme147_get_model(char *model);
  36. extern void mvme147_sched_init(void);
  37. extern int mvme147_hwclk (int, struct rtc_time *);
  38. extern void mvme147_reset (void);
  39. static int bcd2int (unsigned char b);
  40. int __init mvme147_parse_bootinfo(const struct bi_record *bi)
  41. {
  42. uint16_t tag = be16_to_cpu(bi->tag);
  43. if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
  44. return 0;
  45. else
  46. return 1;
  47. }
  48. void mvme147_reset(void)
  49. {
  50. pr_info("\r\n\nCalled mvme147_reset\r\n");
  51. m147_pcc->watchdog = 0x0a; /* Clear timer */
  52. m147_pcc->watchdog = 0xa5; /* Enable watchdog - 100ms to reset */
  53. while (1)
  54. ;
  55. }
  56. static void mvme147_get_model(char *model)
  57. {
  58. sprintf(model, "Motorola MVME147");
  59. }
  60. /*
  61. * This function is called during kernel startup to initialize
  62. * the mvme147 IRQ handling routines.
  63. */
  64. void __init mvme147_init_IRQ(void)
  65. {
  66. m68k_setup_user_interrupt(VEC_USER, 192);
  67. }
  68. void __init config_mvme147(void)
  69. {
  70. mach_sched_init = mvme147_sched_init;
  71. mach_init_IRQ = mvme147_init_IRQ;
  72. mach_hwclk = mvme147_hwclk;
  73. mach_reset = mvme147_reset;
  74. mach_get_model = mvme147_get_model;
  75. /* Board type is only set by newer versions of vmelilo/tftplilo */
  76. if (!vme_brdtype)
  77. vme_brdtype = VME_TYPE_MVME147;
  78. }
  79. static u64 mvme147_read_clk(struct clocksource *cs);
  80. static struct clocksource mvme147_clk = {
  81. .name = "pcc",
  82. .rating = 250,
  83. .read = mvme147_read_clk,
  84. .mask = CLOCKSOURCE_MASK(32),
  85. .flags = CLOCK_SOURCE_IS_CONTINUOUS,
  86. };
  87. static u32 clk_total;
  88. #define PCC_TIMER_CLOCK_FREQ 160000
  89. #define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ)
  90. #define PCC_TIMER_PRELOAD (0x10000 - PCC_TIMER_CYCLES)
  91. /* Using pcc tick timer 1 */
  92. static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
  93. {
  94. unsigned long flags;
  95. local_irq_save(flags);
  96. m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
  97. PCC_TIMER_TIC_EN;
  98. m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
  99. PCC_LEVEL_TIMER1;
  100. clk_total += PCC_TIMER_CYCLES;
  101. legacy_timer_tick(1);
  102. local_irq_restore(flags);
  103. return IRQ_HANDLED;
  104. }
  105. void mvme147_sched_init (void)
  106. {
  107. if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
  108. "timer 1", NULL))
  109. pr_err("Couldn't register timer interrupt\n");
  110. /* Init the clock with a value */
  111. /* The clock counter increments until 0xFFFF then reloads */
  112. m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
  113. m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
  114. PCC_TIMER_TIC_EN;
  115. m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
  116. PCC_LEVEL_TIMER1;
  117. clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
  118. }
  119. static u64 mvme147_read_clk(struct clocksource *cs)
  120. {
  121. unsigned long flags;
  122. u8 overflow, tmp;
  123. u16 count;
  124. u32 ticks;
  125. local_irq_save(flags);
  126. tmp = m147_pcc->t1_cntrl >> 4;
  127. count = m147_pcc->t1_count;
  128. overflow = m147_pcc->t1_cntrl >> 4;
  129. if (overflow != tmp)
  130. count = m147_pcc->t1_count;
  131. count -= PCC_TIMER_PRELOAD;
  132. ticks = count + overflow * PCC_TIMER_CYCLES;
  133. ticks += clk_total;
  134. local_irq_restore(flags);
  135. return ticks;
  136. }
  137. static int bcd2int (unsigned char b)
  138. {
  139. return ((b>>4)*10 + (b&15));
  140. }
  141. int mvme147_hwclk(int op, struct rtc_time *t)
  142. {
  143. if (!op) {
  144. m147_rtc->ctrl = RTC_READ;
  145. t->tm_year = bcd2int (m147_rtc->bcd_year);
  146. t->tm_mon = bcd2int(m147_rtc->bcd_mth) - 1;
  147. t->tm_mday = bcd2int (m147_rtc->bcd_dom);
  148. t->tm_hour = bcd2int (m147_rtc->bcd_hr);
  149. t->tm_min = bcd2int (m147_rtc->bcd_min);
  150. t->tm_sec = bcd2int (m147_rtc->bcd_sec);
  151. m147_rtc->ctrl = 0;
  152. if (t->tm_year < 70)
  153. t->tm_year += 100;
  154. } else {
  155. /* FIXME Setting the time is not yet supported */
  156. return -EOPNOTSUPP;
  157. }
  158. return 0;
  159. }