From: Nabih Estefan Diaz <nabihestefan@google.com>

Implemented GMAC IRQ Handling and added relevant trace-events

Change-Id: I7a2d3cd3f493278bcd0cf483233c1e05c37488b7
Signed-off-by: Nabih Estefan <nabihestefan@google.com>
Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
---
 hw/net/npcm_gmac.c  | 40 ++++++++++++++++++++++++++++++++++++++++
 hw/net/trace-events |  1 +
 2 files changed, 41 insertions(+)

diff --git a/hw/net/npcm_gmac.c b/hw/net/npcm_gmac.c
index 98b3c33c94..44c4ffaff4 100644
--- a/hw/net/npcm_gmac.c
+++ b/hw/net/npcm_gmac.c
@@ -149,6 +149,46 @@ static bool gmac_can_receive(NetClientState *nc)
     return true;
 }
 
+/*
+ * Function that updates the GMAC IRQ
+ * It find the logical OR of the enabled bits for NIS (if enabled)
+ * It find the logical OR of the enabled bits for AIS (if enabled)
+ */
+static void gmac_update_irq(NPCMGMACState *gmac)
+{
+    /*
+     * Check if the normal interrupts summary is enabled
+     * if so, add the bits for the summary that are enabled
+     */
+    if (gmac->regs[R_NPCM_DMA_INTR_ENA] & gmac->regs[R_NPCM_DMA_STATUS] &
+        (NPCM_DMA_INTR_ENAB_NIE_BITS)) {
+        gmac->regs[R_NPCM_DMA_STATUS] |=  NPCM_DMA_STATUS_NIS;
+    }
+    /*
+     * Check if the abnormal interrupts summary is enabled
+     * if so, add the bits for the summary that are enabled
+     */
+    if (gmac->regs[R_NPCM_DMA_INTR_ENA] & gmac->regs[R_NPCM_DMA_STATUS] &
+        (NPCM_DMA_INTR_ENAB_AIE_BITS)) {
+        gmac->regs[R_NPCM_DMA_STATUS] |=  NPCM_DMA_STATUS_AIS;
+    }
+
+    /* Get the logical OR of both normal and abnormal interrupts */
+    int level = !!((gmac->regs[R_NPCM_DMA_STATUS] &
+                    gmac->regs[R_NPCM_DMA_INTR_ENA] &
+                    NPCM_DMA_STATUS_NIS) |
+                   (gmac->regs[R_NPCM_DMA_STATUS] &
+                   gmac->regs[R_NPCM_DMA_INTR_ENA] &
+                   NPCM_DMA_STATUS_AIS));
+
+    /* Set the IRQ */
+    trace_npcm_gmac_update_irq(DEVICE(gmac)->canonical_path,
+                               gmac->regs[R_NPCM_DMA_STATUS],
+                               gmac->regs[R_NPCM_DMA_INTR_ENA],
+                               level);
+    qemu_set_irq(gmac->irq, level);
+}
+
 static ssize_t gmac_receive(NetClientState *nc, const uint8_t *buf, size_t len)
 {
     /* Placeholder. Function will be filled in following patches */
diff --git a/hw/net/trace-events b/hw/net/trace-events
index 33514548b8..56057de47f 100644
--- a/hw/net/trace-events
+++ b/hw/net/trace-events
@@ -473,6 +473,7 @@ npcm_gmac_reg_write(const char *name, uint64_t offset, uint32_t value) "%s: offs
 npcm_gmac_mdio_access(const char *name, uint8_t is_write, uint8_t pa, uint8_t gr, uint16_t val) "%s: is_write: %" PRIu8 " pa: %" PRIu8 " gr: %" PRIu8 " val: 0x%04" PRIx16
 npcm_gmac_reset(const char *name, uint16_t value) "%s: phy_regs[0][1]: 0x%04" PRIx16
 npcm_gmac_set_link(bool active) "Set link: active=%u"
+npcm_gmac_update_irq(const char *name, uint32_t status, uint32_t intr_en, int level) "%s: Status Reg: 0x%04" PRIX32 " Interrupt Enable Reg: 0x%04" PRIX32 " IRQ Set: %d"
 
 # npcm_pcs.c
 npcm_pcs_reg_read(const char *name, uint16_t indirect_access_baes, uint64_t offset, uint16_t value) "%s: IND: 0x%02" PRIx16 " offset: 0x%04" PRIx64 " value: 0x%04" PRIx16
-- 
2.43.0.275.g3460e3d667-goog