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Subject[PATCH 2/4] net: macb: add support for sgmii MAC-PHY interface
Date
This patch add support for SGMII interface and
2.5Gbps MAC in Cadence ethernet controller driver.

Signed-off-by: Milind Parab <mparab@cadence.com>
---
drivers/net/ethernet/cadence/macb.h | 42 ++++++++++++++++++++---------
drivers/net/ethernet/cadence/macb_main.c | 28 +++++++++++++++++++-
2 files changed, 56 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index a400705..5e2957d 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -77,6 +77,7 @@
#define MACB_RBQPH 0x04D4

/* GEM register offsets. */
+#define GEM_NCR 0x0000 /* Network Control */
#define GEM_NCFGR 0x0004 /* Network Config */
#define GEM_USRIO 0x000c /* User IO */
#define GEM_DMACFG 0x0010 /* DMA Configuration */
@@ -156,6 +157,7 @@
#define GEM_PEFTN 0x01f4 /* PTP Peer Event Frame Tx Ns */
#define GEM_PEFRSL 0x01f8 /* PTP Peer Event Frame Rx Sec Low */
#define GEM_PEFRN 0x01fc /* PTP Peer Event Frame Rx Ns */
+#define GEM_PCS_CTRL 0x0200 /* PCS Control */
#define GEM_DCFG1 0x0280 /* Design Config 1 */
#define GEM_DCFG2 0x0284 /* Design Config 2 */
#define GEM_DCFG3 0x0288 /* Design Config 3 */
@@ -271,6 +273,10 @@
#define MACB_IRXFCS_OFFSET 19
#define MACB_IRXFCS_SIZE 1

+/* GEM specific NCR bitfields. */
+#define GEM_TWO_PT_FIVE_GIG_OFFSET 29
+#define GEM_TWO_PT_FIVE_GIG_SIZE 1
+
/* GEM specific NCFGR bitfields. */
#define GEM_GBE_OFFSET 10 /* Gigabit mode enable */
#define GEM_GBE_SIZE 1
@@ -323,6 +329,9 @@
#define MACB_MDIO_SIZE 1
#define MACB_IDLE_OFFSET 2 /* The PHY management logic is idle */
#define MACB_IDLE_SIZE 1
+#define MACB_DUPLEX_OFFSET 3
+#define MACB_DUPLEX_SIZE 1
+

/* Bitfields in TSR */
#define MACB_UBR_OFFSET 0 /* Used bit read */
@@ -456,11 +465,17 @@
#define MACB_REV_OFFSET 0
#define MACB_REV_SIZE 16

+/* Bitfields in PCS_CONTROL. */
+#define GEM_PCS_CTRL_RST_OFFSET 15
+#define GEM_PCS_CTRL_RST_SIZE 1
+
/* Bitfields in DCFG1. */
#define GEM_IRQCOR_OFFSET 23
#define GEM_IRQCOR_SIZE 1
#define GEM_DBWDEF_OFFSET 25
#define GEM_DBWDEF_SIZE 3
+#define GEM_NO_PCS_OFFSET 0
+#define GEM_NO_PCS_SIZE 1

/* Bitfields in DCFG2. */
#define GEM_RX_PKT_BUFF_OFFSET 20
@@ -637,19 +652,20 @@
#define MACB_MAN_CODE 2

/* Capability mask bits */
-#define MACB_CAPS_ISR_CLEAR_ON_WRITE 0x00000001
-#define MACB_CAPS_USRIO_HAS_CLKEN 0x00000002
-#define MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII 0x00000004
-#define MACB_CAPS_NO_GIGABIT_HALF 0x00000008
-#define MACB_CAPS_USRIO_DISABLED 0x00000010
-#define MACB_CAPS_JUMBO 0x00000020
-#define MACB_CAPS_GEM_HAS_PTP 0x00000040
-#define MACB_CAPS_BD_RD_PREFETCH 0x00000080
-#define MACB_CAPS_NEEDS_RSTONUBR 0x00000100
-#define MACB_CAPS_FIFO_MODE 0x10000000
-#define MACB_CAPS_GIGABIT_MODE_AVAILABLE 0x20000000
-#define MACB_CAPS_SG_DISABLED 0x40000000
-#define MACB_CAPS_MACB_IS_GEM 0x80000000
+#define MACB_CAPS_ISR_CLEAR_ON_WRITE BIT(0)
+#define MACB_CAPS_USRIO_HAS_CLKEN BIT(1)
+#define MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII BIT(2)
+#define MACB_CAPS_NO_GIGABIT_HALF BIT(3)
+#define MACB_CAPS_USRIO_DISABLED BIT(4)
+#define MACB_CAPS_JUMBO BIT(5)
+#define MACB_CAPS_GEM_HAS_PTP BIT(6)
+#define MACB_CAPS_BD_RD_PREFETCH BIT(7)
+#define MACB_CAPS_NEEDS_RSTONUBR BIT(8)
+#define MACB_CAPS_FIFO_MODE BIT(28)
+#define MACB_CAPS_GIGABIT_MODE_AVAILABLE BIT(29)
+#define MACB_CAPS_SG_DISABLED BIT(30)
+#define MACB_CAPS_MACB_IS_GEM BIT(31)
+#define MACB_CAPS_PCS BIT(24)

/* LSO settings */
#define MACB_LSO_UFO_ENABLE 0x01
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 15016ff..8269d7a 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -441,6 +441,10 @@ static void gem_phylink_validate(struct phylink_config *pl_config,
__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };

switch (state->interface) {
+ case PHY_INTERFACE_MODE_SGMII:
+ if (!(bp->caps & MACB_CAPS_PCS))
+ goto empty_set;
+ break;
case PHY_INTERFACE_MODE_GMII:
case PHY_INTERFACE_MODE_RGMII:
if (!macb_is_gem(bp))
@@ -451,6 +455,8 @@ static void gem_phylink_validate(struct phylink_config *pl_config,
}

switch (state->interface) {
+ case PHY_INTERFACE_MODE_NA:
+ case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_GMII:
case PHY_INTERFACE_MODE_RGMII:
if (bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) {
@@ -495,8 +501,26 @@ static void gem_mac_config(struct phylink_config *pl_config, unsigned int mode,

spin_lock_irqsave(&bp->lock, flags);

- if (change_interface)
+ if (change_interface) {
bp->phy_interface = state->interface;
+ /* 2.5G mode not supported */
+ gem_writel(bp, NCR, ~GEM_BIT(TWO_PT_FIVE_GIG) &
+ gem_readl(bp, NCR));
+
+ if (state->interface == PHY_INTERFACE_MODE_SGMII) {
+ gem_writel(bp, NCFGR, GEM_BIT(SGMIIEN) |
+ GEM_BIT(PCSSEL) |
+ gem_readl(bp, NCFGR));
+ } else {
+ /* Disable SGMII mode and PCS */
+ gem_writel(bp, NCFGR, ~(GEM_BIT(SGMIIEN) |
+ GEM_BIT(PCSSEL)) &
+ gem_readl(bp, NCFGR));
+ /* Reset PCS */
+ gem_writel(bp, PCS_CTRL, gem_readl(bp, PCS_CTRL) |
+ GEM_BIT(PCS_CTRL_RST));
+ }
+ }

if (!phylink_autoneg_inband(mode) &&
(bp->speed != state->speed ||
@@ -3354,6 +3378,8 @@ static void macb_configure_caps(struct macb *bp,
dcfg = gem_readl(bp, DCFG1);
if (GEM_BFEXT(IRQCOR, dcfg) == 0)
bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
+ if (GEM_BFEXT(NO_PCS, dcfg) == 0)
+ bp->caps |= MACB_CAPS_PCS;
dcfg = gem_readl(bp, DCFG2);
if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
bp->caps |= MACB_CAPS_FIFO_MODE;
--
1.7.1
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