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hw/net: add simple phy support to mcf_fec driver 

The Linux fec driver needs at least basic phy support to probe and work.
The current qemu mcf_fec emulation has no support for the reading or
writing of the MDIO lines to access an attached phy.

This code adds a very simple set of register results for a fixed phy
setup - very similar to that used on an m5208evb board. This is enough
to probe and identify an emulated attached phy.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1435296436-12152-4-git-send-email-gerg@uclinux.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Greg Ungerer 2015-06-26 15:27:15 +10:00 committed by Stefan Hajnoczi
parent 3634869b27
commit 299f7bec5a
2 changed files with 53 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
hw/net/mcf_fec.c
View File

@ -8,6 +8,7 @@
#include "hw/hw.h"
#include "net/net.h"
#include "hw/m68k/mcf.h"
#include "hw/net/mii.h"
/* For crc32 */
#include <zlib.h>
#include "exec/address-spaces.h"
@ -216,6 +217,51 @@ static void mcf_fec_reset(mcf_fec_state *s)
s->rfsr = 0x500;
}
#define MMFR_WRITE_OP (1 << 28)
#define MMFR_READ_OP (2 << 28)
#define MMFR_PHYADDR(v) (((v) >> 23) & 0x1f)
#define MMFR_REGNUM(v) (((v) >> 18) & 0x1f)
static uint64_t mcf_fec_read_mdio(mcf_fec_state *s)
{
uint64_t v;
if (s->mmfr & MMFR_WRITE_OP)
return s->mmfr;
if (MMFR_PHYADDR(s->mmfr) != 1)
return s->mmfr |= 0xffff;
switch (MMFR_REGNUM(s->mmfr)) {
case MII_BMCR:
v = MII_BMCR_SPEED | MII_BMCR_AUTOEN | MII_BMCR_FD;
break;
case MII_BMSR:
v = MII_BMSR_100TX_FD | MII_BMSR_100TX_HD | MII_BMSR_10T_FD |
MII_BMSR_10T_HD | MII_BMSR_MFPS | MII_BMSR_AN_COMP |
MII_BMSR_AUTONEG | MII_BMSR_LINK_ST;
break;
case MII_PHYID1:
v = DP83848_PHYID1;
break;
case MII_PHYID2:
v = DP83848_PHYID2;
break;
case MII_ANAR:
v = MII_ANAR_TXFD | MII_ANAR_TX | MII_ANAR_10FD |
MII_ANAR_10 | MII_ANAR_CSMACD;
break;
case MII_ANLPAR:
v = MII_ANLPAR_ACK | MII_ANLPAR_TXFD | MII_ANLPAR_TX |
MII_ANLPAR_10FD | MII_ANLPAR_10 | MII_ANLPAR_CSMACD;
break;
default:
v = 0xffff;
break;
}
s->mmfr = (s->mmfr & ~0xffff) | v;
return s->mmfr;
}
static uint64_t mcf_fec_read(void *opaque, hwaddr addr,
unsigned size)
{
@ -226,7 +272,7 @@ static uint64_t mcf_fec_read(void *opaque, hwaddr addr,
case 0x010: return s->rx_enabled ? (1 << 24) : 0; /* RDAR */
case 0x014: return 0; /* TDAR */
case 0x024: return s->ecr;
case 0x040: return s->mmfr;
case 0x040: return mcf_fec_read_mdio(s);
case 0x044: return s->mscr;
case 0x064: return 0; /* MIBC */
case 0x084: return s->rcr;
@ -287,8 +333,8 @@ static void mcf_fec_write(void *opaque, hwaddr addr,
}
break;
case 0x040:
/* TODO: Implement MII. */
s->mmfr = value;
s->eir |= FEC_INT_MII;
break;
case 0x044:
s->mscr = value & 0xfe;

5
include/hw/net/mii.h
View File

@ -65,7 +65,12 @@
#define MII_ANLPAR_CSMACD (1 << 0)
/* List of vendor identifiers */
/* RealTek 8201 */
#define RTL8201CP_PHYID1 0x0000
#define RTL8201CP_PHYID2 0x8201
/* National Semiconductor DP83848 */
#define DP83848_PHYID1 0x2000
#define DP83848_PHYID2 0x5c90
#endif /* MII_H */