ppc4xx: Add MII mode support to the EMAC RGMII Bridge

This patch adds support for placing the RGMII bridge on the
PPC405EX(r) into MII/GMII mode and allows a board-specific
configuration to specify the bridge mode at compile-time.

Signed-off-by: Grant Erickson <gerickson@nuovations.com>
Signed-off-by: Stefan Roese <sr@denx.de>

4 files changed, 86 insertions, 12 deletions

diff --git a/cpu/ppc4xx/4xx_enet.c b/cpu/ppc4xx/4xx_enet.c
index 4e863dc9118..26d74d258d0 100644
--- a/cpu/ppc4xx/4xx_enet.c
+++ b/cpu/ppc4xx/4xx_enet.c
@@ -465,30 +465,88 @@ int ppc_4xx_eth_setup_bridge(int devnum, bd_t * bis)
 #if defined(CONFIG_405EX)
 int ppc_4xx_eth_setup_bridge(int devnum, bd_t * bis)
 {
-	u32 gmiifer = 0;
+	u32 rgmiifer = 0;
 
 	/*
-	 * Right now only 2*RGMII is supported. Please extend when needed.
-	 * sr - 2007-09-19
+	 * The 405EX(r)'s RGMII bridge can operate in one of several
+	 * modes, only one of which (2 x RGMII) allows the
+	 * simultaneous use of both EMACs on the 405EX.
 	 */
-	switch (1) {
-	case 1:
+
+	switch (CONFIG_EMAC_PHY_MODE) {
+
+	case EMAC_PHY_MODE_NONE:
+		/* No ports */
+		rgmiifer |= RGMII_FER_DIS	<< 0;
+		rgmiifer |= RGMII_FER_DIS	<< 4;
+		out_be32((void *)RGMII_FER, rgmiifer);
+		bis->bi_phymode[0] = BI_PHYMODE_NONE;
+		bis->bi_phymode[1] = BI_PHYMODE_NONE;
+		break;
+	case EMAC_PHY_MODE_NONE_RGMII:
+		/* 1 x RGMII port on channel 0 */
+		rgmiifer |= RGMII_FER_RGMII	<< 0;
+		rgmiifer |= RGMII_FER_DIS	<< 4;
+		out_be32((void *)RGMII_FER, rgmiifer);
+		bis->bi_phymode[0] = BI_PHYMODE_RGMII;
+		bis->bi_phymode[1] = BI_PHYMODE_NONE;
+		break;
+	case EMAC_PHY_MODE_RGMII_NONE:
+		/* 1 x RGMII port on channel 1 */
+		rgmiifer |= RGMII_FER_DIS	<< 0;
+		rgmiifer |= RGMII_FER_RGMII	<< 4;
+		out_be32((void *)RGMII_FER, rgmiifer);
+		bis->bi_phymode[0] = BI_PHYMODE_NONE;
+		bis->bi_phymode[1] = BI_PHYMODE_RGMII;
+		break;
+	case EMAC_PHY_MODE_RGMII_RGMII:
 		/* 2 x RGMII ports */
-		out_be32((void *)RGMII_FER, 0x00000055);
+		rgmiifer |= RGMII_FER_RGMII	<< 0;
+		rgmiifer |= RGMII_FER_RGMII	<< 4;
+		out_be32((void *)RGMII_FER, rgmiifer);
 		bis->bi_phymode[0] = BI_PHYMODE_RGMII;
 		bis->bi_phymode[1] = BI_PHYMODE_RGMII;
 		break;
-	case 2:
-		/* 2 x SMII ports */
+	case EMAC_PHY_MODE_NONE_GMII:
+		/* 1 x GMII port on channel 0 */
+		rgmiifer |= RGMII_FER_GMII	<< 0;
+		rgmiifer |= RGMII_FER_DIS	<< 4;
+		out_be32((void *)RGMII_FER, rgmiifer);
+		bis->bi_phymode[0] = BI_PHYMODE_GMII;
+		bis->bi_phymode[1] = BI_PHYMODE_NONE;
+		break;
+	case EMAC_PHY_MODE_NONE_MII:
+		/* 1 x MII port on channel 0 */
+		rgmiifer |= RGMII_FER_MII	<< 0;
+		rgmiifer |= RGMII_FER_DIS	<< 4;
+		out_be32((void *)RGMII_FER, rgmiifer);
+		bis->bi_phymode[0] = BI_PHYMODE_MII;
+		bis->bi_phymode[1] = BI_PHYMODE_NONE;
+		break;
+	case EMAC_PHY_MODE_GMII_NONE:
+		/* 1 x GMII port on channel 1 */
+		rgmiifer |= RGMII_FER_DIS	<< 0;
+		rgmiifer |= RGMII_FER_GMII	<< 4;
+		out_be32((void *)RGMII_FER, rgmiifer);
+		bis->bi_phymode[0] = BI_PHYMODE_NONE;
+		bis->bi_phymode[1] = BI_PHYMODE_GMII;
+		break;
+	case EMAC_PHY_MODE_MII_NONE:
+		/* 1 x MII port on channel 1 */
+		rgmiifer |= RGMII_FER_DIS	<< 0;
+		rgmiifer |= RGMII_FER_MII	<< 4;
+		out_be32((void *)RGMII_FER, rgmiifer);
+		bis->bi_phymode[0] = BI_PHYMODE_NONE;
+		bis->bi_phymode[1] = BI_PHYMODE_MII;
 		break;
 	default:
 		break;
 	}
 
 	/* Ensure we setup mdio for this devnum and ONLY this devnum */
-	gmiifer = in_be32((void *)RGMII_FER);
-	gmiifer |= (1 << (19-devnum));
-	out_be32((void *)RGMII_FER, gmiifer);
+	rgmiifer = in_be32((void *)RGMII_FER);
+	rgmiifer |= (1 << (19-devnum));
+	out_be32((void *)RGMII_FER, rgmiifer);
 
 	return ((int)0x0);
 }
diff --git a/include/configs/kilauea.h b/include/configs/kilauea.h
index f3d048cb7ed..dc246fd23e3 100644
--- a/include/configs/kilauea.h
+++ b/include/configs/kilauea.h
@@ -375,6 +375,7 @@
  *----------------------------------------------------------------------*/
 #define CONFIG_M88E1111_PHY	1
 #define CONFIG_IBM_EMAC4_V4	1
+#define CONFIG_EMAC_PHY_MODE	EMAC_PHY_MODE_RGMII_RGMII
 #define CONFIG_PHY_ADDR		1	/* PHY address, See schematics	*/
 
 #define CONFIG_PHY_RESET	1	/* reset phy upon startup	*/
diff --git a/include/configs/makalu.h b/include/configs/makalu.h
index 65b240e0f18..ab92ae488de 100644
--- a/include/configs/makalu.h
+++ b/include/configs/makalu.h
@@ -223,6 +223,7 @@
  *----------------------------------------------------------------------*/
 #define CONFIG_M88E1111_PHY	1
 #define CONFIG_IBM_EMAC4_V4	1
+#define CONFIG_EMAC_PHY_MODE	EMAC_PHY_MODE_RGMII_RGMII
 #define CONFIG_PHY_ADDR		6	/* PHY address, See schematics	*/
 
 #define CONFIG_PHY_RESET	1	/* reset phy upon startup	*/
diff --git a/include/ppc4xx_enet.h b/include/ppc4xx_enet.h
index 4c97b36c05b..b74c6fcafde 100644
--- a/include/ppc4xx_enet.h
+++ b/include/ppc4xx_enet.h
@@ -153,6 +153,20 @@ typedef struct emac_4xx_hw_st {
 #define SDR0_PFC1_EM_1000	(0x00200000)
 #endif
 
+/*
+ * XMII bridge configurations for those systems (e.g. 405EX(r)) that do
+ * not have a pin function control (PFC) register to otherwise determine
+ * the bridge configuration.
+ */
+#define EMAC_PHY_MODE_NONE		0
+#define EMAC_PHY_MODE_NONE_RGMII	1
+#define EMAC_PHY_MODE_RGMII_NONE	2
+#define EMAC_PHY_MODE_RGMII_RGMII	3
+#define EMAC_PHY_MODE_NONE_GMII		4
+#define EMAC_PHY_MODE_GMII_NONE		5
+#define EMAC_PHY_MODE_NONE_MII		6
+#define EMAC_PHY_MODE_MII_NONE		7
+
 /* ZMII Bridge Register addresses */
 #if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
     defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
@@ -218,12 +232,12 @@ typedef struct emac_4xx_hw_st {
 #endif
 
 /* RGMII Function Enable (FER) Register Bit Definitions */
-/* Note: for EMAC 2 and 3 only, 440GX only */
 #define RGMII_FER_DIS		(0x00)
 #define RGMII_FER_RTBI		(0x04)
 #define RGMII_FER_RGMII		(0x05)
 #define RGMII_FER_TBI		(0x06)
 #define RGMII_FER_GMII		(0x07)
+#define RGMII_FER_MII		(RGMII_FER_GMII)
 
 #define RGMII_FER_V(__x)	((__x - 2) * 4)