bgmac: add support for new BGMAC_CMDCFG_SR position on core rev >= 4

The BGMAC_CMDCFG_SR register is at a different position on core rev >= 4
We do not know where this register is on a rev 5 or higher core, I have
newer seen such a core.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bgmac.c

@@ -768,13 +768,13 @@ static void bgmac_cmdcfg_maskset(struct bgmac *bgmac, u32 mask, u32 set,
 	u32 cmdcfg = bgmac_read(bgmac, BGMAC_CMDCFG);
 	u32 new_val = (cmdcfg & mask) | set;
 
-	bgmac_set(bgmac, BGMAC_CMDCFG, BGMAC_CMDCFG_SR);
+	bgmac_set(bgmac, BGMAC_CMDCFG, BGMAC_CMDCFG_SR(bgmac->core->id.rev));
 	udelay(2);
 
 	if (new_val != cmdcfg || force)
 		bgmac_write(bgmac, BGMAC_CMDCFG, new_val);
 
-	bgmac_mask(bgmac, BGMAC_CMDCFG, ~BGMAC_CMDCFG_SR);
+	bgmac_mask(bgmac, BGMAC_CMDCFG, ~BGMAC_CMDCFG_SR(bgmac->core->id.rev));
 	udelay(2);
 }
 
@@ -977,7 +977,7 @@ static void bgmac_chip_reset(struct bgmac *bgmac)
 			     BGMAC_CMDCFG_PROM |
 			     BGMAC_CMDCFG_NLC |
 			     BGMAC_CMDCFG_CFE |
-			     BGMAC_CMDCFG_SR,
+			     BGMAC_CMDCFG_SR(core->id.rev),
 			     false);
 	bgmac->mac_speed = SPEED_UNKNOWN;
 	bgmac->mac_duplex = DUPLEX_UNKNOWN;
@@ -1020,7 +1020,7 @@ static void bgmac_enable(struct bgmac *bgmac)
 
 	cmdcfg = bgmac_read(bgmac, BGMAC_CMDCFG);
 	bgmac_cmdcfg_maskset(bgmac, ~(BGMAC_CMDCFG_TE | BGMAC_CMDCFG_RE),
-			     BGMAC_CMDCFG_SR, true);
+			     BGMAC_CMDCFG_SR(bgmac->core->id.rev), true);
 	udelay(2);
 	cmdcfg |= BGMAC_CMDCFG_TE | BGMAC_CMDCFG_RE;
 	bgmac_write(bgmac, BGMAC_CMDCFG, cmdcfg);

drivers/net/ethernet/broadcom/bgmac.h

@@ -197,7 +197,9 @@
 #define  BGMAC_CMDCFG_TAI			0x00000200
 #define  BGMAC_CMDCFG_HD			0x00000400	/* Set if in half duplex mode */
 #define  BGMAC_CMDCFG_HD_SHIFT			10
-#define  BGMAC_CMDCFG_SR			0x00000800	/* Set to reset mode */
+#define  BGMAC_CMDCFG_SR_REV0			0x00000800	/* Set to reset mode, for other revs */
+#define  BGMAC_CMDCFG_SR_REV4			0x00002000	/* Set to reset mode, only for core rev 4 */
+#define  BGMAC_CMDCFG_SR(rev)  ((rev == 4) ? BGMAC_CMDCFG_SR_REV4 : BGMAC_CMDCFG_SR_REV0)
 #define  BGMAC_CMDCFG_ML			0x00008000	/* Set to activate mac loopback mode */
 #define  BGMAC_CMDCFG_AE			0x00400000
 #define  BGMAC_CMDCFG_CFE			0x00800000