static void imx_gpt_write(void *opaque, hwaddr offset, uint64_t value, unsigned size) { IMXGPTState *s = IMX_GPT(opaque); uint32_t oldreg; uint32_t reg = offset >> 2; DPRINTF("(%s, value = 0x%08x)\n", imx_gpt_reg_name(reg), (uint32_t)value); switch (reg) { case 0: oldreg = s->cr; s->cr = value & ~0x7c14; if (s->cr & GPT_CR_SWR) { /* force reset */ /* handle the reset */ imx_gpt_reset(DEVICE(s)); } else { /* set our freq, as the source might have changed */ imx_gpt_set_freq(s); if ((oldreg ^ s->cr) & GPT_CR_EN) { if (s->cr & GPT_CR_EN) { if (s->cr & GPT_CR_ENMOD) { s->next_timeout = TIMER_MAX; ptimer_set_count(s->timer, TIMER_MAX); imx_gpt_compute_next_timeout(s, false); } ptimer_run(s->timer, 1); } else { /* stop timer */ ptimer_stop(s->timer); } } } break; case 1: /* Prescaler */ s->pr = value & 0xfff; imx_gpt_set_freq(s); break; case 2: /* SR */ s->sr &= ~(value & 0x3f); imx_gpt_update_int(s); break; case 3: /* IR -- interrupt register */ s->ir = value & 0x3f; imx_gpt_update_int(s); imx_gpt_compute_next_timeout(s, false); break; case 4: /* OCR1 -- output compare register */ s->ocr1 = value; /* In non-freerun mode, reset count when this register is written */ if (!(s->cr & GPT_CR_FRR)) { s->next_timeout = TIMER_MAX; ptimer_set_limit(s->timer, TIMER_MAX, 1); } /* compute the new timeout */ imx_gpt_compute_next_timeout(s, false); break; case 5: /* OCR2 -- output compare register */ s->ocr2 = value; /* compute the new timeout */ imx_gpt_compute_next_timeout(s, false); break; case 6: /* OCR3 -- output compare register */ s->ocr3 = value; /* compute the new timeout */ imx_gpt_compute_next_timeout(s, false); break; default: IPRINTF("Bad offset %x\n", reg); break; } }