From bee68b89ef60aa40cbefe305c7f0c738cf3c2a9d Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sun, 22 Jun 2025 03:19:38 -0400
Subject: kernel: e1000: Grant NIC PCI MMIO/DMA capabilities

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/dev/phy/e1000.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'sys/dev')

diff --git a/sys/dev/phy/e1000.c b/sys/dev/phy/e1000.c
index ad20e52..c9782a5 100644
--- a/sys/dev/phy/e1000.c
+++ b/sys/dev/phy/e1000.c
@@ -100,6 +100,20 @@ e1000_chip_init(struct e1000_nic *np)
     return 0;
 }
 
+/*
+ * Enables PCI specific bits like bus mastering (for DMA)
+ * as well as MMIO.
+ */
+static void
+e1000_init_pci(void)
+{
+    uint32_t tmp;
+
+    tmp = pci_readl(e1000, PCIREG_CMDSTATUS);
+    tmp |= (PCI_BUS_MASTERING | PCI_MEM_SPACE);
+    pci_writel(e1000, PCIREG_CMDSTATUS, tmp);
+}
+
 static int
 e1000_init(void)
 {
@@ -124,6 +138,7 @@ e1000_init(void)
         return status;
     }
 
+    e1000_init_pci();
     e1000_chip_init(&nic);
     return 0;
 }
-- 
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