rtl8139: enable bus mastering if needed

This resolves #2.

Change-Id: Ie6736f0d5a713025f09c18de7042ba44fbb1b2f8

diff --git a/minix/drivers/net/rtl8139/rtl8139.c b/minix/drivers/net/rtl8139/rtl8139.c
index a71f460908eb9dfc6ce09b6bf81c74e19007352b..6318d2fd9c1ac45f469532c08cbd37422c3f947c 100644 (file)
--- a/minix/drivers/net/rtl8139/rtl8139.c
+++ b/minix/drivers/net/rtl8139/rtl8139.c
@@ -411,7 +411,7 @@ re_t *rep;
 int skip;
 {
        int r, devind;
-       u16_t vid, did;
+       u16_t cr, vid, did;
        u32_t bar;
        u8_t ilr;
 #if VERBOSE
@@ -437,7 +437,13 @@ int skip;
        printf("%s (%x/%x) at %s\n", dname, vid, did, pci_slot_name(devind));
 #endif
        pci_reserve(devind);
-       /* printf("cr = 0x%x\n", pci_attr_r16(devind, PCI_CR)); */
+
+       /* Enable bus mastering if necessary. */
+       cr = pci_attr_r16(devind, PCI_CR);
+       /* printf("cr = 0x%x\n", cr); */
+       if (!(cr & PCI_CR_MAST_EN))
+               pci_attr_w16(devind, PCI_CR, cr | PCI_CR_MAST_EN);
+
        bar= pci_attr_r32(devind, PCI_BAR) & 0xffffffe0;
        if (bar < 0x400) {
                panic("base address is not properly configured");