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net: bcmgenet: add support for new GENET PHY revision scheme

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Starting with GPHY revision G0, the GENET register layout has changed to
use the same numbering scheme as the Starfighter 2 switch. This means
that GPHY major revision is in bits 15:12, minor in bits 11:8 and patch
level is in bits 7:4.

Introduce a small heuristic which checks for the old scheme first, tests
for the new scheme and finally attempts to catch reserved values and
aborts.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2014-12-03 09:56:59 -08:00 committed by David S. Miller
parent 6db70e3e1d
commit b04a2f5b9f
1 changed files with 23 additions and 1 deletions
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24
drivers/net/ethernet/broadcom/genet/bcmgenet.c
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@ -2504,6 +2504,7 @@ static void bcmgenet_set_hw_params(struct bcmgenet_priv *priv)
struct bcmgenet_hw_params *params;
u32 reg;
u8 major;
u16 gphy_rev;
if (GENET_IS_V4(priv)) {
bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
@ -2552,8 +2553,29 @@ static void bcmgenet_set_hw_params(struct bcmgenet_priv *priv)
* to pass this information to the PHY driver. The PHY driver expects
* to find the PHY major revision in bits 15:8 while the GENET register
* stores that information in bits 7:0, account for that.
*
* On newer chips, starting with PHY revision G0, a new scheme is
* deployed similar to the Starfighter 2 switch with GPHY major
* revision in bits 15:8 and patch level in bits 7:0. Major revision 0
* is reserved as well as special value 0x01ff, we have a small
* heuristic to check for the new GPHY revision and re-arrange things
* so the GPHY driver is happy.
*/
priv->gphy_rev = (reg & 0xffff) << 8;
gphy_rev = reg & 0xffff;
/* This is the good old scheme, just GPHY major, no minor nor patch */
if ((gphy_rev & 0xf0) != 0)
priv->gphy_rev = gphy_rev << 8;
/* This is the new scheme, GPHY major rolls over with 0x10 = rev G0 */
else if ((gphy_rev & 0xff00) != 0)
priv->gphy_rev = gphy_rev;
/* This is reserved so should require special treatment */
else if (gphy_rev == 0 || gphy_rev == 0x01ff) {
pr_warn("Invalid GPHY revision detected: 0x%04x\n", gphy_rev);
return;
}
#ifdef CONFIG_PHYS_ADDR_T_64BIT
if (!(params->flags & GENET_HAS_40BITS))