[PATCH net-next v2 3/5] net: stmmac: add xpcs function hooks into main driver and ethtool

Voon Weifeng
2019-05-23T07:32:28Z

From: Ong Boon Leong <boon.leong.ong@intel.com>

With xPCS functions now ready, we add them into the main driver and
ethtool logics. To differentiate from EQoS MAC PCS and DWC Ethernet
xPCS, we introduce 'has_xpcs' in platform data as a mean to indicate
whether GBE controller includes xPCS or not.

To support platform-specific C37 AN PCS mode selection for MII MMD,
we introduce 'pcs_mode' in platform data.

The basic framework for xPCS interrupt handling is implemented too.

Reviewed-by: Chuah Kim Tatt <kim.tatt.chuah@intel.com>
Reviewed-by: Voon Weifeng <weifeng.voon@intel.com>
Reviewed-by: Kweh Hock Leong <hock.leong.kweh@intel.com>
Reviewed-by: Baoli Zhang <baoli.zhang@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 2 +
.../net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 50 +++++--
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 152 ++++++++++++++++-----
include/linux/stmmac.h | 2 +
4 files changed, 158 insertions(+), 48 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index dd95d959c1ce..0b8460a4a220 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -36,6 +36,7 @@ struct stmmac_resources {
const char *mac;
int wol_irq;
int lpi_irq;
+ int xpcs_irq;
int irq;
};

@@ -168,6 +169,7 @@ struct stmmac_priv {
int clk_csr;
struct timer_list eee_ctrl_timer;
int lpi_irq;
+ int xpcs_irq;
int eee_enabled;
int eee_active;
int tx_lpi_timer;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index e09522c5509a..f0815d196147 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -28,6 +28,7 @@

#include "stmmac.h"
#include "dwmac_dma.h"
+#include "dwxpcs.h"

#define REG_SPACE_SIZE 0x1060
#define MAC100_ETHTOOL_NAME "st_mac100"
@@ -277,7 +278,8 @@ static int stmmac_ethtool_get_link_ksettings(struct net_device *dev,
struct phy_device *phy = dev->phydev;

if (priv->hw->pcs & STMMAC_PCS_RGMII ||
- priv->hw->pcs & STMMAC_PCS_SGMII) {
+ priv->hw->pcs & STMMAC_PCS_SGMII ||
+ priv->plat->pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX) {
struct rgmii_adv adv;
u32 supported, advertising, lp_advertising;

@@ -294,6 +296,11 @@ static int stmmac_ethtool_get_link_ksettings(struct net_device *dev,
if (stmmac_pcs_get_adv_lp(priv, priv->ioaddr, &adv))
return -EOPNOTSUPP; /* should never happen indeed */

+ /* Get ADV & LPA is only application for 1000BASE-X C37.
+ * For MAC side SGMII AN, get ADV & LPA from PHY.
+ */
+ stmmac_xpcs_get_adv_lp(priv, dev, &adv, priv->plat->pcs_mode);
+
/* Encoding of PSE bits is defined in 802.3z, 37.2.1.4 */

ethtool_convert_link_mode_to_legacy_u32(
@@ -376,22 +383,23 @@ static int stmmac_ethtool_get_link_ksettings(struct net_device *dev,
int rc;

if (priv->hw->pcs & STMMAC_PCS_RGMII ||
- priv->hw->pcs & STMMAC_PCS_SGMII) {
- u32 mask = ADVERTISED_Autoneg | ADVERTISED_Pause;
-
+ priv->hw->pcs & STMMAC_PCS_SGMII ||
+ priv->plat->pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX) {
/* Only support ANE */
if (cmd->base.autoneg != AUTONEG_ENABLE)
return -EINVAL;

- mask &= (ADVERTISED_1000baseT_Half |
- ADVERTISED_1000baseT_Full |
- ADVERTISED_100baseT_Half |
- ADVERTISED_100baseT_Full |
- ADVERTISED_10baseT_Half |
- ADVERTISED_10baseT_Full);
-
mutex_lock(&priv->lock);
stmmac_pcs_ctrl_ane(priv, priv->ioaddr, 1, priv->hw->ps, 0);
+
+ /* For 1000BASE-X C37 AN, it is always 1000Mbps. And, we only
+ * support FD which is set by default in SR_MII_AN_ADV
+ * during XPCS init. So, we don't need to set FD again.
+ * For SGMII C37 AN, we let user to change link settings
+ * through PHY since it is MAC side SGMII.
+ */
+ stmmac_xpcs_ctrl_ane(priv, dev, 1, 0);
+
mutex_unlock(&priv->lock);

return 0;
@@ -457,6 +465,16 @@ static void stmmac_ethtool_gregs(struct net_device *dev,
pause->autoneg = 1;
if (!adv_lp.pause)
return;
+ } else if (priv->plat->pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX &&
+ !stmmac_xpcs_get_adv_lp(priv, netdev, &adv_lp,
+ priv->plat->pcs_mode)) {
+ /* DW xPCS 1000BASE-X C37 AN mode only because for MAC side
+ * SGMII C37 AN, xPCS AN ADV is not set. See more comment in
+ * dw_xpcs_init()
+ */
+ pause->autoneg = 1;
+ if (!adv_lp.pause)
+ return;
} else {
if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
netdev->phydev->supported) ||
@@ -488,6 +506,16 @@ static void stmmac_ethtool_gregs(struct net_device *dev,
pause->autoneg = 1;
if (!adv_lp.pause)
return -EOPNOTSUPP;
+ } else if (priv->plat->pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX &&
+ !stmmac_xpcs_get_adv_lp(priv, netdev, &adv_lp,
+ priv->plat->pcs_mode)) {
+ /* DW xPCS 1000BASE-X C37 AN mode only because for MAC side
+ * SGMII C37 AN, xPCS AN ADV is not set. See more comment in
+ * dw_xpcs_init()
+ */
+ pause->autoneg = 1;
+ if (!adv_lp.pause)
+ return -EOPNOTSUPP;
} else {
if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phy->supported) ||
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 2a1052704885..f6e3b1282079 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -112,6 +112,7 @@
MODULE_PARM_DESC(chain_mode, "To use chain instead of ring mode");

static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
+static irqreturn_t xpcs_interrupt(int irq, void *dev_id);

#ifdef CONFIG_DEBUG_FS
static int stmmac_init_fs(struct net_device *dev);
@@ -848,6 +849,55 @@ static void stmmac_mac_flow_ctrl(struct stmmac_priv *priv, u32 duplex)
priv->pause, tx_cnt);
}

+static bool mac_adjust_link(struct stmmac_priv *priv,
+ int *speed, int *duplex)
+{
+ bool new_state = false;
+
+ u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
+
+ /* Now we make sure that we can be in full duplex mode.
+ * If not, we operate in half-duplex mode.
+ */
+ if (*duplex != priv->oldduplex) {
+ new_state = true;
+ if (!*duplex)
+ ctrl &= ~priv->hw->link.duplex;
+ else
+ ctrl |= priv->hw->link.duplex;
+ priv->oldduplex = *duplex;
+ }
+
+ if (*speed != priv->speed) {
+ new_state = true;
+ ctrl &= ~priv->hw->link.speed_mask;
+ switch (*speed) {
+ case SPEED_1000:
+ ctrl |= priv->hw->link.speed1000;
+ break;
+ case SPEED_100:
+ ctrl |= priv->hw->link.speed100;
+ break;
+ case SPEED_10:
+ ctrl |= priv->hw->link.speed10;
+ break;
+ default:
+ netif_warn(priv, link, priv->dev,
+ "broken speed: %d\n", *speed);
+ *speed = SPEED_UNKNOWN;
+ break;
+ }
+ if (*speed != SPEED_UNKNOWN)
+ stmmac_hw_fix_mac_speed(priv);
+
+ priv->speed = *speed;
+ }
+
+ writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
+
+ return new_state;
+}
+
/**
* stmmac_adjust_link - adjusts the link parameters
* @dev: net device structure
@@ -869,47 +919,12 @@ static void stmmac_adjust_link(struct net_device *dev)
mutex_lock(&priv->lock);

if (phydev->link) {
- u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
-
- /* Now we make sure that we can be in full duplex mode.
- * If not, we operate in half-duplex mode. */
- if (phydev->duplex != priv->oldduplex) {
- new_state = true;
- if (!phydev->duplex)
- ctrl &= ~priv->hw->link.duplex;
- else
- ctrl |= priv->hw->link.duplex;
- priv->oldduplex = phydev->duplex;
- }
/* Flow Control operation */
if (phydev->pause)
stmmac_mac_flow_ctrl(priv, phydev->duplex);

- if (phydev->speed != priv->speed) {
- new_state = true;
- ctrl &= ~priv->hw->link.speed_mask;
- switch (phydev->speed) {
- case SPEED_1000:
- ctrl |= priv->hw->link.speed1000;
- break;
- case SPEED_100:
- ctrl |= priv->hw->link.speed100;
- break;
- case SPEED_10:
- ctrl |= priv->hw->link.speed10;
- break;
- default:
- netif_warn(priv, link, priv->dev,
- "broken speed: %d\n", phydev->speed);
- phydev->speed = SPEED_UNKNOWN;
- break;
- }
- if (phydev->speed != SPEED_UNKNOWN)
- stmmac_hw_fix_mac_speed(priv);
- priv->speed = phydev->speed;
- }
-
- writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
+ new_state = mac_adjust_link(priv, &phydev->speed,
+ &phydev->duplex);

if (!priv->oldlink) {
new_state = true;
@@ -2538,6 +2553,9 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
/* Initialize MTL*/
stmmac_mtl_configuration(priv);

+ /* Initialize the xPCS PHY */
+ stmmac_xpcs_init(priv, dev, priv->plat->pcs_mode);
+
/* Initialize Safety Features */
stmmac_safety_feat_configuration(priv);

@@ -2579,6 +2597,8 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
if (priv->hw->pcs)
stmmac_pcs_ctrl_ane(priv, priv->hw, 1, priv->hw->ps, 0);

+ stmmac_xpcs_ctrl_ane(priv, dev, 1, 0);
+
/* set TX and RX rings length */
stmmac_set_rings_length(priv);

@@ -2694,11 +2714,27 @@ static int stmmac_open(struct net_device *dev)
}
}

+ /* xPCS IRQ line */
+ if (priv->xpcs_irq > 0) {
+ ret = request_irq(priv->xpcs_irq, xpcs_interrupt, IRQF_SHARED,
+ dev->name, dev);
+ if (unlikely(ret < 0)) {
+ netdev_err(priv->dev,
+ "%s: ERROR: allocating the xPCS IRQ %d (%d)\n",
+ __func__, priv->xpcs_irq, ret);
+ goto xpcsirq_error;
+ }
+ }
+
stmmac_enable_all_queues(priv);
stmmac_start_all_queues(priv);

return 0;

+xpcsirq_error:
+ if (priv->lpi_irq > 0)
+ free_irq(priv->lpi_irq, dev);
+
lpiirq_error:
if (priv->wol_irq != dev->irq)
free_irq(priv->wol_irq, dev);
@@ -3772,6 +3808,47 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}

+/**
+ * xPCS_interrupt - xPCS ISR
+ * @irq: interrupt number.
+ * @dev_id: to pass the net device pointer.
+ * Description: this is the xPCS interrupt service routine.
+ */
+static irqreturn_t xpcs_interrupt(int irq, void *dev_id)
+{
+ irqreturn_t ret = IRQ_NONE;
+ struct net_device *ndev = (struct net_device *)dev_id;
+ struct stmmac_priv *priv = netdev_priv(ndev);
+
+ if (unlikely(!ndev)) {
+ netdev_err(priv->dev, "%s: invalid dev pointer\n",
+ __func__);
+ return ret;
+ }
+
+ /* To handle xPCS interrupts */
+ ret = stmmac_xpcs_irq_status(priv, ndev, &priv->xstats,
+ priv->plat->pcs_mode);
+
+ if (ret == IRQ_HANDLED) {
+ /* Keep the MAC's speed & duplex consistent with DW xPCS
+ * because AN in DW xPCS does not update DW EQoS MAC
+ * directly.
+ */
+ int speed = (int)priv->xstats.pcs_speed;
+ int duplex = (int)priv->xstats.pcs_speed;
+
+ mac_adjust_link(priv, &speed, &duplex);
+
+ if (priv->xstats.pcs_link)
+ netif_carrier_on(ndev);
+ else
+ netif_carrier_off(ndev);
+ }
+
+ return ret;
+}
+
#ifdef CONFIG_NET_POLL_CONTROLLER
/* Polling receive - used by NETCONSOLE and other diagnostic tools
* to allow network I/O with interrupts disabled.
@@ -4261,6 +4338,7 @@ int stmmac_dvr_probe(struct device *device,
priv->dev->irq = res->irq;
priv->wol_irq = res->wol_irq;
priv->lpi_irq = res->lpi_irq;
+ priv->xpcs_irq = res->xpcs_irq;

if (!IS_ERR_OR_NULL(res->mac))
memcpy(priv->dev->dev_addr, res->mac, ETH_ALEN);
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index b00e7951a66d..c6778abd41c5 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -189,6 +189,8 @@ struct plat_stmmacenet_data {
struct reset_control *stmmac_rst;
struct stmmac_axi *axi;
int has_gmac4;
+ bool has_xpcs;
+ int pcs_mode;
bool has_sun8i;
bool tso_en;
int mac_port_sel_speed;
--
1.9.1