[PATCH v6 4/4] net: macb: add support for high speed interface

Parshuram Thombare
2019-07-10T14:39:38Z

This patch add support for high speed USXGMII PCS and 10G
speed in Cadence ethernet controller driver.

Signed-off-by: Parshuram Thombare <pthombar@cadence.com>
---
drivers/net/ethernet/cadence/macb.h | 43 ++++++++
drivers/net/ethernet/cadence/macb_main.c | 132 +++++++++++++++++++++--
2 files changed, 165 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index 3ed5bffb735b..e3ec224ffc2a 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -82,6 +82,7 @@
#define GEM_USRIO 0x000c /* User IO */
#define GEM_DMACFG 0x0010 /* DMA Configuration */
#define GEM_JML 0x0048 /* Jumbo Max Length */
+#define GEM_HS_MAC_CONFIG 0x0050 /* GEM high speed config */
#define GEM_HRB 0x0080 /* Hash Bottom */
#define GEM_HRT 0x0084 /* Hash Top */
#define GEM_SA1B 0x0088 /* Specific1 Bottom */
@@ -166,7 +167,13 @@
#define GEM_DCFG6 0x0294 /* Design Config 6 */
#define GEM_DCFG7 0x0298 /* Design Config 7 */
#define GEM_DCFG8 0x029C /* Design Config 8 */
+#define GEM_DCFG9 0x02A0 /* Design Config 9 */
#define GEM_DCFG10 0x02A4 /* Design Config 10 */
+#define GEM_DCFG11 0x02A8 /* Design Config 11 */
+#define GEM_DCFG12 0x02AC /* Design Config 12 */
+#define GEM_DCFG13 0x02B0 /* Design Config 13 */
+#define GEM_USX_CONTROL 0x0A80 /* USXGMII control register */
+#define GEM_USX_STATUS 0x0A88 /* USXGMII status register */

#define GEM_TXBDCTRL 0x04cc /* TX Buffer Descriptor control register */
#define GEM_RXBDCTRL 0x04d0 /* RX Buffer Descriptor control register */
@@ -274,6 +281,8 @@
#define MACB_IRXFCS_SIZE 1

/* GEM specific NCR bitfields. */
+#define GEM_ENABLE_HS_MAC_OFFSET 31
+#define GEM_ENABLE_HS_MAC_SIZE 1
#define GEM_TWO_PT_FIVE_GIG_OFFSET 29
#define GEM_TWO_PT_FIVE_GIG_SIZE 1

@@ -465,6 +474,10 @@
#define MACB_REV_OFFSET 0
#define MACB_REV_SIZE 16

+/* Bitfield in HS_MAC_CONFIG */
+#define GEM_HS_MAC_SPEED_OFFSET 0
+#define GEM_HS_MAC_SPEED_SIZE 3
+
/* Bitfields in PCS_CONTROL. */
#define GEM_PCS_CTRL_RST_OFFSET 15
#define GEM_PCS_CTRL_RST_SIZE 1
@@ -510,6 +523,34 @@
#define GEM_RXBD_RDBUFF_OFFSET 8
#define GEM_RXBD_RDBUFF_SIZE 4

+/* Bitfields in DCFG12. */
+#define GEM_HIGH_SPEED_OFFSET 26
+#define GEM_HIGH_SPEED_SIZE 1
+
+/* Bitfields in USX_CONTROL. */
+#define GEM_USX_CTRL_SPEED_OFFSET 14
+#define GEM_USX_CTRL_SPEED_SIZE 3
+#define GEM_SERDES_RATE_OFFSET 12
+#define GEM_SERDES_RATE_SIZE 2
+#define GEM_RX_SCR_BYPASS_OFFSET 9
+#define GEM_RX_SCR_BYPASS_SIZE 1
+#define GEM_TX_SCR_BYPASS_OFFSET 8
+#define GEM_TX_SCR_BYPASS_SIZE 1
+#define GEM_RX_SYNC_RESET_OFFSET 2
+#define GEM_RX_SYNC_RESET_SIZE 1
+#define GEM_TX_EN_OFFSET 1
+#define GEM_TX_EN_SIZE 1
+#define GEM_SIGNAL_OK_OFFSET 0
+#define GEM_SIGNAL_OK_SIZE 1
+
+/* Bitfields in USX_STATUS. */
+#define GEM_USX_TX_FAULT_OFFSET 28
+#define GEM_USX_TX_FAULT_SIZE 1
+#define GEM_USX_RX_FAULT_OFFSET 27
+#define GEM_USX_RX_FAULT_SIZE 1
+#define GEM_USX_BLOCK_LOCK_OFFSET 0
+#define GEM_USX_BLOCK_LOCK_SIZE 1
+
/* Bitfields in TISUBN */
#define GEM_SUBNSINCR_OFFSET 0
#define GEM_SUBNSINCRL_OFFSET 24
@@ -674,6 +715,7 @@
#define MACB_CAPS_MACB_IS_GEM BIT(31)
#define MACB_CAPS_PCS BIT(24)
#define MACB_CAPS_MACB_IS_GEM_GXL BIT(25)
+#define MACB_CAPS_HIGH_SPEED BIT(26)

#define MACB_GEM7010_IDNUM 0x009
#define MACB_GEM7014_IDNU 0x107
@@ -753,6 +795,7 @@
})

#define MACB_READ_NSR(bp) macb_readl(bp, NSR)
+#define GEM_READ_USX_STATUS(bp) gem_readl(bp, USX_STATUS)

/* struct macb_dma_desc - Hardware DMA descriptor
* @addr: DMA address of data buffer
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 792073d1b5c3..6551c03e7628 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -82,6 +82,20 @@ struct sifive_fu540_macb_mgmt {
#define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 0)
#define MACB_WOL_ENABLED (0x1 << 1)

+enum {
+ HS_MAC_SPEED_100M,
+ HS_MAC_SPEED_1000M,
+ HS_MAC_SPEED_2500M,
+ HS_MAC_SPEED_5000M,
+ HS_MAC_SPEED_10000M,
+ HS_MAC_SPEED_25000M,
+};
+
+enum {
+ MACB_SERDES_RATE_5G,
+ MACB_SERDES_RATE_10G,
+};
+
/* Graceful stop timeouts in us. We should allow up to
* 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
*/
@@ -91,6 +105,8 @@ struct sifive_fu540_macb_mgmt {

#define MACB_MDIO_TIMEOUT 1000000 /* in usecs */

+#define MACB_USX_BLOCK_LOCK_TIMEOUT 1000000 /* in usecs */
+
/* DMA buffer descriptor might be different size
* depends on hardware configuration:
*
@@ -491,12 +507,32 @@ static void gem_phylink_validate(struct phylink_config *pl_config,
if (!macb_is_gem(bp))
goto empty_set;
break;
+ case PHY_INTERFACE_MODE_USXGMII:
+ if (!(bp->caps & MACB_CAPS_HIGH_SPEED &&
+ bp->caps & MACB_CAPS_PCS))
+ goto empty_set;
+ break;
default:
break;
}

switch (state->interface) {
case PHY_INTERFACE_MODE_NA:
+ case PHY_INTERFACE_MODE_USXGMII:
+ case PHY_INTERFACE_MODE_10GKR:
+ if (bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) {
+ phylink_set(mask, 10000baseCR_Full);
+ phylink_set(mask, 10000baseER_Full);
+ phylink_set(mask, 10000baseKR_Full);
+ phylink_set(mask, 10000baseLR_Full);
+ phylink_set(mask, 10000baseLRM_Full);
+ phylink_set(mask, 10000baseSR_Full);
+ phylink_set(mask, 10000baseT_Full);
+ phylink_set(mask, 5000baseT_Full);
+ phylink_set(mask, 2500baseX_Full);
+ phylink_set(mask, 1000baseX_Full);
+ }
+ /* fallthrough */
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_GMII:
case PHY_INTERFACE_MODE_RGMII:
@@ -532,6 +568,80 @@ static int gem_phylink_mac_link_state(struct phylink_config *pl_config,
return -EOPNOTSUPP;
}

+static int macb_wait_for_usx_block_lock(struct macb *bp)
+{
+ u32 val;
+
+ return readx_poll_timeout(GEM_READ_USX_STATUS, bp, val,
+ val & GEM_BIT(USX_BLOCK_LOCK),
+ 1, MACB_USX_BLOCK_LOCK_TIMEOUT);
+}
+
+static inline int gem_mac_usx_configure(struct macb *bp, int spd)
+{
+ u32 speed, config;
+
+ gem_writel(bp, NCFGR, GEM_BIT(PCSSEL) |
+ (~GEM_BIT(SGMIIEN) & gem_readl(bp, NCFGR)));
+ gem_writel(bp, NCR, gem_readl(bp, NCR) |
+ GEM_BIT(ENABLE_HS_MAC));
+ gem_writel(bp, NCFGR, gem_readl(bp, NCFGR) |
+ MACB_BIT(FD));
+ config = gem_readl(bp, USX_CONTROL);
+ config = GEM_BFINS(SERDES_RATE, MACB_SERDES_RATE_10G, config);
+ config &= ~GEM_BIT(TX_SCR_BYPASS);
+ config &= ~GEM_BIT(RX_SCR_BYPASS);
+ gem_writel(bp, USX_CONTROL, config |
+ GEM_BIT(TX_EN));
+ config = gem_readl(bp, USX_CONTROL);
+ gem_writel(bp, USX_CONTROL, config | GEM_BIT(SIGNAL_OK));
+ if (macb_wait_for_usx_block_lock(bp) < 0) {
+ netdev_warn(bp->dev, "USXGMII block lock failed");
+ return -ETIMEDOUT;
+ }
+
+ switch (spd) {
+ case SPEED_10000:
+ speed = HS_MAC_SPEED_10000M;
+ break;
+ case SPEED_5000:
+ speed = HS_MAC_SPEED_5000M;
+ break;
+ case SPEED_2500:
+ speed = HS_MAC_SPEED_2500M;
+ break;
+ case SPEED_1000:
+ speed = HS_MAC_SPEED_1000M;
+ break;
+ default:
+ case SPEED_100:
+ speed = HS_MAC_SPEED_100M;
+ break;
+ }
+
+ gem_writel(bp, HS_MAC_CONFIG, GEM_BFINS(HS_MAC_SPEED, speed,
+ gem_readl(bp, HS_MAC_CONFIG)));
+ gem_writel(bp, USX_CONTROL, GEM_BFINS(USX_CTRL_SPEED, speed,
+ gem_readl(bp, USX_CONTROL)));
+ return 0;
+}
+
+static inline void gem_mac_configure(struct macb *bp, int speed)
+{
+ switch (speed) {
+ case SPEED_1000:
+ gem_writel(bp, NCFGR, GEM_BIT(GBE) |
+ gem_readl(bp, NCFGR));
+ break;
+ case SPEED_100:
+ macb_writel(bp, NCFGR, MACB_BIT(SPD) |
+ macb_readl(bp, NCFGR));
+ break;
+ default:
+ break;
+ }
+}
+
static void gem_mac_config(struct phylink_config *pl_config, unsigned int mode,
const struct phylink_link_state *state)
{
@@ -574,18 +684,17 @@ static void gem_mac_config(struct phylink_config *pl_config, unsigned int mode,
reg &= ~GEM_BIT(GBE);
if (state->duplex)
reg |= MACB_BIT(FD);
+ macb_or_gem_writel(bp, NCFGR, reg);

- switch (state->speed) {
- case SPEED_1000:
- reg |= GEM_BIT(GBE);
- break;
- case SPEED_100:
- reg |= MACB_BIT(SPD);
- break;
- default:
- break;
+ if (bp->phy_interface == PHY_INTERFACE_MODE_USXGMII) {
+ if (gem_mac_usx_configure(bp, state->speed) < 0) {
+ spin_unlock_irqrestore(&bp->lock, flags);
+ phylink_mac_change(bp->pl, false);
+ return;
+ }
+ } else {
+ gem_mac_configure(bp, state->speed);
}
- macb_or_gem_writel(bp, NCFGR, reg);

bp->speed = state->speed;
bp->duplex = state->duplex;
@@ -3435,6 +3544,9 @@ static void macb_configure_caps(struct macb *bp,
default:
break;
}
+ dcfg = gem_readl(bp, DCFG12);
+ if (GEM_BFEXT(HIGH_SPEED, dcfg) == 1)
+ bp->caps |= MACB_CAPS_HIGH_SPEED;
dcfg = gem_readl(bp, DCFG2);
if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
bp->caps |= MACB_CAPS_FIFO_MODE;
--
2.17.1