diff options
Diffstat (limited to 'hw/ppc/pnv_lpc.c')
| -rw-r--r-- | hw/ppc/pnv_lpc.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/hw/ppc/pnv_lpc.c b/hw/ppc/pnv_lpc.c index d692858bee..7d26b29487 100644 --- a/hw/ppc/pnv_lpc.c +++ b/hw/ppc/pnv_lpc.c @@ -505,7 +505,14 @@ static void lpc_hc_write(void *opaque, hwaddr addr, uint64_t val, pnv_lpc_eval_irqs(lpc); break; case LPC_HC_IRQSTAT: - lpc->lpc_hc_irqstat &= ~val; + /* + * This register is write-to-clear for the IRQSER (LPC device IRQ) + * status. However if the device has not de-asserted its interrupt + * that will just raise this IRQ status bit again. Model this by + * keeping track of the inputs and only clearing if the inputs are + * deasserted. + */ + lpc->lpc_hc_irqstat &= ~(val & ~lpc->lpc_hc_irq_inputs); pnv_lpc_eval_irqs(lpc); break; case LPC_HC_ERROR_ADDRESS: @@ -803,11 +810,20 @@ static void pnv_lpc_isa_irq_handler_cpld(void *opaque, int n, int level) static void pnv_lpc_isa_irq_handler(void *opaque, int n, int level) { PnvLpcController *lpc = PNV_LPC(opaque); + uint32_t irq_bit = LPC_HC_IRQ_SERIRQ0 >> n; - /* The Naples HW latches the 1 levels, clearing is done by SW */ if (level) { - lpc->lpc_hc_irqstat |= LPC_HC_IRQ_SERIRQ0 >> n; + lpc->lpc_hc_irq_inputs |= irq_bit; + + /* + * The LPC HC in Naples and later latches LPC IRQ into a bit field in + * the IRQSTAT register, and that drives the PSI IRQ to the IC. + * Software clears this bit manually (see LPC_HC_IRQSTAT handler). + */ + lpc->lpc_hc_irqstat |= irq_bit; pnv_lpc_eval_irqs(lpc); + } else { + lpc->lpc_hc_irq_inputs &= ~irq_bit; } } |