escc: reset register values to zero in escc_reset()
This is to ensure that a device reset always returns the ESCC to a known state. Note that this is currently redundant with the same code in escc_reset_chn() but that will change shortly. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <20210903113223.19551-3-mark.cave-ayland@ilande.co.uk> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
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@ -300,9 +300,24 @@ static void escc_reset_chn(ESCCChannelState *s)
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static void escc_reset(DeviceState *d)
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static void escc_reset(DeviceState *d)
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{
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{
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ESCCState *s = ESCC(d);
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ESCCState *s = ESCC(d);
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int i, j;
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escc_reset_chn(&s->chn[0]);
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for (i = 0; i < 2; i++) {
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escc_reset_chn(&s->chn[1]);
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ESCCChannelState *cs = &s->chn[i];
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/*
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* According to the ESCC datasheet "Miscellaneous Questions" section
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* on page 384, the values of the ESCC registers are not guaranteed on
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* power-on until an explicit hardware or software reset has been
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* issued. For now we zero the registers so that a device reset always
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* returns the emulated device to a fixed state.
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*/
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for (j = 0; j < ESCC_SERIAL_REGS; j++) {
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cs->rregs[j] = 0;
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cs->wregs[j] = 0;
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}
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escc_reset_chn(cs);
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}
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}
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}
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static inline void set_rxint(ESCCChannelState *s)
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static inline void set_rxint(ESCCChannelState *s)
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