[PATCH v9 07/10] include/hw/net: General GMAC Implementation

[Nabih Estefan]

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

Implemented Classes and Masks for GMAC Descriptors
 - Implemeted classes for GMAC Receive and Transmit Descriptors
 - Implemented Masks for said descriptors

- General GMAC Register handling
- GMAC IRQ Handling

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 |  8 ++++++++
 2 files changed, 48 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..78efa2ec2c 100644
--- a/hw/net/trace-events
+++ b/hw/net/trace-events
@@ -473,6 +473,14 @@ 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_gmac_packet_desc_read(const char* name, uint32_t desc_addr) "%s: 
attempting to read descriptor @0x%04" PRIX32
+npcm_gmac_packet_receive(const char* name, uint32_t len) "%s: RX packet 
length: 0x%04" PRIX32
+npcm_gmac_packet_receiving_buffer(const char* name, uint32_t buf_len, uint32_t 
rx_buf_addr) "%s: Receiving into Buffer size: 0x%04" PRIX32 " at address 0x%04" 
PRIX32
+npcm_gmac_packet_received(const char* name, uint32_t len) "%s: Reception 
finished, packet left: 0x%04" PRIX32
+npcm_gmac_packet_sent(const char* name, uint16_t len) "%s: TX packet sent!, 
length: 0x%04" PRIX16
+npcm_gmac_debug_desc_data(const char* name, void* addr, uint32_t des0, 
uint32_t des1, uint32_t des2, uint32_t des3)"%s: Address: %p Descriptor 0: 
0x%04" PRIX32 " Descriptor 1: 0x%04" PRIX32 "Descriptor 2: 0x%04" PRIX32 " 
Descriptor 3: 0x%04" PRIX32
+npcm_gmac_packet_tx_desc_data(const char* name, uint32_t tdes0, uint32_t 
tdes1) "%s: Tdes0: 0x%04" PRIX32 " Tdes1: 0x%04" PRIX32
 
 # 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
-- 
2.43.0.472.g3155946c3a-goog