pmu: add adb_autopoll_block() and adb_autopoll_unblock() functions
Ensure that the PMU buffer is protected from autopoll requests overwriting its contents whilst existing PMU requests are in progress. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Tested-by: Finn Thain <fthain@telegraphics.com.au> Acked-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20200623204936.24064-18-mark.cave-ayland@ilande.co.uk>
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@ -517,6 +517,7 @@ static void pmu_update(PMUState *s)
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{
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MOS6522PMUState *mps = &s->mos6522_pmu;
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MOS6522State *ms = MOS6522(mps);
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ADBBusState *adb_bus = &s->adb_bus;
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/* Only react to changes in reg B */
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if (ms->b == s->last_b) {
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@ -578,6 +579,7 @@ static void pmu_update(PMUState *s)
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s->cmd_rsp_pos = 0;
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s->cmd_state = pmu_state_cmd;
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adb_autopoll_block(adb_bus);
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trace_pmu_debug_protocol_cmd(s->cmd, s->cmdlen, s->rsplen);
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break;
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@ -636,6 +638,7 @@ static void pmu_update(PMUState *s)
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if (s->cmd_state == pmu_state_rsp && s->rsplen == s->cmd_rsp_pos) {
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trace_pmu_debug_protocol_cmd_resp_complete(ms->ier);
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adb_autopoll_unblock(adb_bus);
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s->cmd_state = pmu_state_idle;
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}
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}
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