From: Benjamin Herrenschmidt <b...@kernel.crashing.org>
It adds the Naples chip which supports proper LPC interrupts via the
LPC controller rather than via an external CPLD.
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
[clg: - updated for qemu-2.7
- ported on latest PowerNV patchset (v3) ]
Signed-off-by: Cédric Le Goater <c...@kaod.org>
---
Changes since v4:
- remove test on ISA_NUM_IRQS
hw/ppc/pnv.c | 15 ++++++++++++++-
hw/ppc/pnv_lpc.c | 47 +++++++++++++++++++++++++++++++++++++++++++++--
include/hw/ppc/pnv_lpc.h | 9 +++++++++
3 files changed, 68 insertions(+), 3 deletions(-)
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index ddbf7510424c..4ef80b5b4110 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -336,7 +336,14 @@ 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)
{
- /* XXX TODO */
+ PnvChip *chip = opaque;
+ PnvLpcController *lpc = &chip->lpc;
+
+ /* The Naples HW latches the 1 levels, clearing is done by SW */
+ if (level) {
+ lpc->lpc_hc_irqstat |= LPC_HC_IRQ_SERIRQ0 >> n;
+ pnv_lpc_eval_irqs(lpc);
+ }
}
static ISABus *pnv_isa_create(PnvChip *chip)
@@ -659,6 +666,12 @@ static void pnv_chip_init(Object *obj)
object_property_add_child(obj, "occ", OBJECT(&chip->occ), NULL);
object_property_add_const_link(OBJECT(&chip->occ), "psi",
OBJECT(&chip->psi), &error_abort);
+
+ /*
+ * The LPC controller needs PSI to generate interrupts
+ */
+ object_property_add_const_link(OBJECT(&chip->lpc), "psi",
+ OBJECT(&chip->psi), &error_abort);
}
static void pnv_chip_realize(DeviceState *dev, Error **errp)
diff --git a/hw/ppc/pnv_lpc.c b/hw/ppc/pnv_lpc.c
index 00dbd8b07b38..91e966565694 100644
--- a/hw/ppc/pnv_lpc.c
+++ b/hw/ppc/pnv_lpc.c
@@ -249,6 +249,34 @@ static const MemoryRegionOps pnv_lpc_xscom_ops = {
.endianness = DEVICE_BIG_ENDIAN,
};
+void pnv_lpc_eval_irqs(PnvLpcController *lpc)
+{
+ bool lpc_to_opb_irq = false;
+
+ /* Update LPC controller to OPB line */
+ if (lpc->lpc_hc_irqser_ctrl & LPC_HC_IRQSER_EN) {
+ uint32_t irqs;
+
+ irqs = lpc->lpc_hc_irqstat & lpc->lpc_hc_irqmask;
+ lpc_to_opb_irq = (irqs != 0);
+ }
+
+ /* We don't honor the polarity register, it's pointless and unused
+ * anyway
+ */
+ if (lpc_to_opb_irq) {
+ lpc->opb_irq_input |= OPB_MASTER_IRQ_LPC;
+ } else {
+ lpc->opb_irq_input &= ~OPB_MASTER_IRQ_LPC;
+ }
+
+ /* Update OPB internal latch */
+ lpc->opb_irq_stat |= lpc->opb_irq_input & lpc->opb_irq_mask;
+
+ /* Reflect the interrupt */
+ pnv_psi_irq_set(lpc->psi, PSIHB_IRQ_LPC_I2C, lpc->opb_irq_stat != 0);
+}
+
static uint64_t lpc_hc_read(void *opaque, hwaddr addr, unsigned size)
{
PnvLpcController *lpc = opaque;
@@ -299,12 +327,15 @@ static void lpc_hc_write(void *opaque, hwaddr addr,
uint64_t val,
break;
case LPC_HC_IRQSER_CTRL:
lpc->lpc_hc_irqser_ctrl = val;
+ pnv_lpc_eval_irqs(lpc);
break;
case LPC_HC_IRQMASK:
lpc->lpc_hc_irqmask = val;
+ pnv_lpc_eval_irqs(lpc);
break;
case LPC_HC_IRQSTAT:
lpc->lpc_hc_irqstat &= ~val;
+ pnv_lpc_eval_irqs(lpc);
break;
case LPC_HC_ERROR_ADDRESS:
break;
@@ -362,14 +393,15 @@ static void opb_master_write(void *opaque, hwaddr addr,
switch (addr) {
case OPB_MASTER_LS_IRQ_STAT:
lpc->opb_irq_stat &= ~val;
+ pnv_lpc_eval_irqs(lpc);
break;
case OPB_MASTER_LS_IRQ_MASK:
- /* XXX Filter out reserved bits */
lpc->opb_irq_mask = val;
+ pnv_lpc_eval_irqs(lpc);
break;
case OPB_MASTER_LS_IRQ_POL:
- /* XXX Filter out reserved bits */
lpc->opb_irq_pol = val;
+ pnv_lpc_eval_irqs(lpc);
break;
case OPB_MASTER_LS_IRQ_INPUT:
/* Read only */
@@ -397,6 +429,8 @@ static const MemoryRegionOps opb_master_ops = {
static void pnv_lpc_realize(DeviceState *dev, Error **errp)
{
PnvLpcController *lpc = PNV_LPC(dev);
+ Object *obj;
+ Error *error = NULL;
/* Reg inits */
lpc->lpc_hc_fw_rd_acc_size = LPC_HC_FW_RD_4B;
@@ -440,6 +474,15 @@ static void pnv_lpc_realize(DeviceState *dev, Error **errp)
pnv_xscom_region_init(&lpc->xscom_regs, OBJECT(dev),
&pnv_lpc_xscom_ops, lpc, "xscom-lpc",
PNV_XSCOM_LPC_SIZE);
+
+ /* get PSI object from chip */
+ obj = object_property_get_link(OBJECT(dev), "psi", &error);
+ if (!obj) {
+ error_setg(errp, "%s: required link 'psi' not found: %s",
+ __func__, error_get_pretty(error));
+ return;
+ }
+ lpc->psi = PNV_PSI(obj);
}
static void pnv_lpc_class_init(ObjectClass *klass, void *data)
diff --git a/include/hw/ppc/pnv_lpc.h b/include/hw/ppc/pnv_lpc.h
index 38e5506975aa..3ed7dafc799d 100644
--- a/include/hw/ppc/pnv_lpc.h
+++ b/include/hw/ppc/pnv_lpc.h
@@ -23,6 +23,8 @@
#define PNV_LPC(obj) \
OBJECT_CHECK(PnvLpcController, (obj), TYPE_PNV_LPC)
+typedef struct PnvPsiController PnvPsiController;
+
typedef struct PnvLpcController {
DeviceState parent;
@@ -62,6 +64,13 @@ typedef struct PnvLpcController {
/* XSCOM registers */
MemoryRegion xscom_regs;
+
+ /* PSI to generate interrupts */
+ PnvPsiController *psi;
} PnvLpcController;
+#define LPC_HC_IRQ_SERIRQ0 0x80000000 /* all bits down to ... */
+
+void pnv_lpc_eval_irqs(PnvLpcController *lpc);
+
#endif /* _PPC_PNV_LPC_H */
--
2.7.4
