[RFC net-next 8/8] net: stmmac: Integrate it with DesignWare XPCS

Jose Abreu
2020-01-27T11:16:44Z

Adds all the necessary logic so that stmmac can be used with Synopsys
DesignWare XPCS.

Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Jose Abreu <joabreu@synopsys.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Cc: netdev@vger.kernel.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 1 +
drivers/net/ethernet/stmicro/stmmac/common.h | 3 +++
drivers/net/ethernet/stmicro/stmmac/hwif.h | 12 ++++++++++
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 16 +++++++++++++-
drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 27 +++++++++++++++++++++++
include/linux/stmmac.h | 1 +
6 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 338e25a6374e..9ad927f646e8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -3,6 +3,7 @@ config STMMAC_ETH
tristate "STMicroelectronics Multi-Gigabit Ethernet driver"
depends on HAS_IOMEM && HAS_DMA
select MII
+ select MDIO_XPCS
select PAGE_POOL
select PHYLINK
select CRC32
diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 487099092693..9bdbf589d93f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -15,6 +15,7 @@
#include <linux/netdevice.h>
#include <linux/stmmac.h>
#include <linux/phy.h>
+#include <linux/mdio-xpcs.h>
#include <linux/module.h>
#if IS_ENABLED(CONFIG_VLAN_8021Q)
#define STMMAC_VLAN_TAG_USED
@@ -446,6 +447,8 @@ struct mac_device_info {
const struct stmmac_hwtimestamp *ptp;
const struct stmmac_tc_ops *tc;
const struct stmmac_mmc_ops *mmc;
+ const struct mdio_xpcs_ops *xpcs;
+ struct mdio_xpcs_args xpcs_args;
struct mii_regs mii; /* MII register Addresses */
struct mac_link link;
void __iomem *pcsr; /* vpointer to device CSRs */
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index df63b0367aff..c71dd99c8abf 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -577,6 +577,18 @@ struct stmmac_mmc_ops {
#define stmmac_mmc_read(__priv, __args...) \
stmmac_do_void_callback(__priv, mmc, read, __args)

+/* XPCS callbacks */
+#define stmmac_xpcs_validate(__priv, __args...) \
+ stmmac_do_callback(__priv, xpcs, validate, __args)
+#define stmmac_xpcs_config(__priv, __args...) \
+ stmmac_do_callback(__priv, xpcs, config, __args)
+#define stmmac_xpcs_get_state(__priv, __args...) \
+ stmmac_do_callback(__priv, xpcs, get_state, __args)
+#define stmmac_xpcs_link_up(__priv, __args...) \
+ stmmac_do_callback(__priv, xpcs, link_up, __args)
+#define stmmac_xpcs_probe(__priv, __args...) \
+ stmmac_do_callback(__priv, xpcs, probe, __args)
+
struct stmmac_regs_off {
u32 ptp_off;
u32 mmc_off;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index eaedea4b353e..19084b10f3c2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -863,12 +863,18 @@ static void stmmac_validate(struct phylink_config *config,

phylink_and(state->advertising, mac_supported);
phylink_andnot(state->advertising, mask);
+
+ /* If PCS is supported, check which modes it supports */
+ stmmac_xpcs_validate(priv, &priv->hw->xpcs_args, supported, state);
}

static void stmmac_mac_pcs_get_state(struct phylink_config *config,
struct phylink_link_state *state)
{
+ struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
+
state->link = 0;
+ stmmac_xpcs_get_state(priv, &priv->hw->xpcs_args, state);
}

static void stmmac_mac_config(struct phylink_config *config, unsigned int mode,
@@ -877,6 +883,11 @@ static void stmmac_mac_config(struct phylink_config *config, unsigned int mode,
struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
u32 ctrl;

+ if (priv->hw->xpcs && !state->an_complete) {
+ stmmac_xpcs_config(priv, &priv->hw->xpcs_args, state);
+ return;
+ }
+
ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
ctrl &= ~priv->hw->link.speed_mask;

@@ -952,6 +963,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
{
struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));

+ stmmac_xpcs_link_up(priv, &priv->hw->xpcs_args, priv->speed, interface);
stmmac_mac_set(priv, priv->ioaddr, true);
if (phy && priv->dma_cap.eee) {
priv->eee_active = phy_init_eee(phy, 1) >= 0;
@@ -1040,6 +1052,7 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)

priv->phylink_config.dev = &priv->dev->dev;
priv->phylink_config.type = PHYLINK_NETDEV;
+ priv->phylink_config.pcs_poll = true;

if (!fwnode)
fwnode = dev_fwnode(priv->device);
@@ -2687,7 +2700,8 @@ static int stmmac_open(struct net_device *dev)
int ret;

if (priv->hw->pcs != STMMAC_PCS_TBI &&
- priv->hw->pcs != STMMAC_PCS_RTBI) {
+ priv->hw->pcs != STMMAC_PCS_RTBI &&
+ priv->hw->xpcs == NULL) {
ret = stmmac_init_phy(dev);
if (ret) {
netdev_err(priv->dev,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index cfe5d8b73142..b2a707e2ef43 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -382,6 +382,14 @@ int stmmac_mdio_register(struct net_device *ndev)
max_addr = PHY_MAX_ADDR;
}

+ if (mdio_bus_data->has_xpcs) {
+ priv->hw->xpcs = mdio_xpcs_get_ops();
+ if (!priv->hw->xpcs) {
+ err = -ENODEV;
+ goto bus_register_fail;
+ }
+ }
+
if (mdio_bus_data->needs_reset)
new_bus->reset = &stmmac_mdio_reset;

@@ -433,6 +441,25 @@ int stmmac_mdio_register(struct net_device *ndev)
found = 1;
}

+ /* Try to probe the XPCS by scanning all addresses. */
+ if (priv->hw->xpcs) {
+ struct mdio_xpcs_args *xpcs = &priv->hw->xpcs_args;
+ int ret, mode = priv->plat->phy_interface;
+ max_addr = PHY_MAX_ADDR;
+
+ xpcs->bus = new_bus;
+
+ for (addr = 0; addr < max_addr; addr++) {
+ xpcs->addr = addr;
+
+ ret = stmmac_xpcs_probe(priv, xpcs, mode);
+ if (!ret) {
+ found = 1;
+ break;
+ }
+ }
+ }
+
if (!found && !mdio_node) {
dev_warn(dev, "No PHY found\n");
mdiobus_unregister(new_bus);
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 19190c609282..fbafb353e9be 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -80,6 +80,7 @@

struct stmmac_mdio_bus_data {
unsigned int phy_mask;
+ unsigned int has_xpcs;
int *irqs;
int probed_phy_irq;
bool needs_reset;
--
2.7.4