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Subject[PATCH v1 4/4] net: dsa: add support for Atheros AR9331 build-in switch
Date
Provide basic support for Atheros AR9331 build-in switch. So far it
works as port multiplexer without any hardware offloading support.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
drivers/net/dsa/Kconfig | 2 +
drivers/net/dsa/Makefile | 1 +
drivers/net/dsa/qca/Kconfig | 11 +
drivers/net/dsa/qca/Makefile | 2 +
drivers/net/dsa/qca/ar9331.c | 822 +++++++++++++++++++++++++++++++++++
include/net/dsa.h | 2 +
net/dsa/Kconfig | 6 +
net/dsa/Makefile | 1 +
net/dsa/tag_ar9331.c | 97 +++++
9 files changed, 944 insertions(+)
create mode 100644 drivers/net/dsa/qca/Kconfig
create mode 100644 drivers/net/dsa/qca/Makefile
create mode 100644 drivers/net/dsa/qca/ar9331.c
create mode 100644 net/dsa/tag_ar9331.c

diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig
index f6232ce8481f..de9610a3dd5c 100644
--- a/drivers/net/dsa/Kconfig
+++ b/drivers/net/dsa/Kconfig
@@ -52,6 +52,8 @@ source "drivers/net/dsa/microchip/Kconfig"

source "drivers/net/dsa/mv88e6xxx/Kconfig"

+source "drivers/net/dsa/qca/Kconfig"
+
source "drivers/net/dsa/sja1105/Kconfig"

config NET_DSA_QCA8K
diff --git a/drivers/net/dsa/Makefile b/drivers/net/dsa/Makefile
index ae70b79628d6..90e5b1ed69c5 100644
--- a/drivers/net/dsa/Makefile
+++ b/drivers/net/dsa/Makefile
@@ -20,4 +20,5 @@ obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX_SPI) += vitesse-vsc73xx-spi.o
obj-y += b53/
obj-y += microchip/
obj-y += mv88e6xxx/
+obj-y += qca/
obj-y += sja1105/
diff --git a/drivers/net/dsa/qca/Kconfig b/drivers/net/dsa/qca/Kconfig
new file mode 100644
index 000000000000..7e4978f46642
--- /dev/null
+++ b/drivers/net/dsa/qca/Kconfig
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config NET_DSA_AR9331
+ tristate "Atheros AR9331 Ethernet switch support"
+ depends on NET_DSA
+ select NET_DSA_TAG_AR9331
+ select REGMAP
+ ---help---
+ This enables support for the Atheros AR9331 build-in Ethernet
+ switch.
+
+
diff --git a/drivers/net/dsa/qca/Makefile b/drivers/net/dsa/qca/Makefile
new file mode 100644
index 000000000000..274022319066
--- /dev/null
+++ b/drivers/net/dsa/qca/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_NET_DSA_AR9331) += ar9331.o
diff --git a/drivers/net/dsa/qca/ar9331.c b/drivers/net/dsa/qca/ar9331.c
new file mode 100644
index 000000000000..62537fef59a7
--- /dev/null
+++ b/drivers/net/dsa/qca/ar9331.c
@@ -0,0 +1,822 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2019 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
+
+#include <linux/bitfield.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/of_mdio.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <net/dsa.h>
+
+#define AR9331_SW_NAME "ar9331_switch"
+#define AR9331_SW_PORTS 6
+
+/* dummy reg to change page */
+#define AR9331_SW_REG_PAGE BIT(18)
+
+/* Global Interrupt */
+#define AR9331_SW_REG_GINT 0x10
+#define AR9331_SW_REG_GINT_MASK 0x14
+#define AR9331_SW_GINT_PHY_INT BIT(2)
+
+#define AR9331_SW_REG_FLOOD_MASK 0x2c
+#define AR9331_SW_FLOOD_MASK_BROAD_TO_CPU BIT(26)
+
+#define AR9331_SW_REG_GLOBAL_CTRL 0x30
+#define AR9331_SW_GLOBAL_CTRL_MFS_M GENMASK(13, 0)
+
+#define AR9331_SW_REG_MDIO_CTRL 0x98
+#define AR9331_SW_MDIO_CTRL_BUSY BIT(31)
+#define AR9331_SW_MDIO_CTRL_MASTER_EN BIT(30)
+#define AR9331_SW_MDIO_CTRL_CMD_READ BIT(27)
+#define AR9331_SW_MDIO_CTRL_PHY_ADDR_M GENMASK(25, 21)
+#define AR9331_SW_MDIO_CTRL_REG_ADDR_M GENMASK(20, 16)
+#define AR9331_SW_MDIO_CTRL_DATA_M GENMASK(16, 0)
+
+#define AR9331_SW_REG_PORT_STATUS(_port) (0x100 + (_port) * 0x100)
+
+/* FLOW_LINK_EN - enable mac flow control config auto-neg with phy.
+ * If not set, mac can be config by software.
+ */
+#define AR9331_SW_PORT_STATUS_FLOW_LINK_EN BIT(12)
+
+/* LINK_EN - If set, MAC is configured from PHY link status.
+ * If not set, MAC should be configured by software.
+ */
+#define AR9331_SW_PORT_STATUS_LINK_EN BIT(9)
+#define AR9331_SW_PORT_STATUS_DUPLEX_MODE BIT(6)
+#define AR9331_SW_PORT_STATUS_RX_FLOW_EN BIT(5)
+#define AR9331_SW_PORT_STATUS_TX_FLOW_EN BIT(4)
+#define AR9331_SW_PORT_STATUS_RXMAC BIT(3)
+#define AR9331_SW_PORT_STATUS_TXMAC BIT(2)
+#define AR9331_SW_PORT_STATUS_SPEED_M GENMASK(1, 0)
+#define AR9331_SW_PORT_STATUS_SPEED_1000 2
+#define AR9331_SW_PORT_STATUS_SPEED_100 1
+#define AR9331_SW_PORT_STATUS_SPEED_10 0
+
+#define AR9331_SW_PORT_STATUS_MAC_MASK \
+ (AR9331_SW_PORT_STATUS_TXMAC | AR9331_SW_PORT_STATUS_RXMAC)
+
+#define AR9331_SW_PORT_STATUS_LINK_MASK \
+ (AR9331_SW_PORT_STATUS_LINK_EN | AR9331_SW_PORT_STATUS_FLOW_LINK_EN | \
+ AR9331_SW_PORT_STATUS_DUPLEX_MODE | \
+ AR9331_SW_PORT_STATUS_RX_FLOW_EN | AR9331_SW_PORT_STATUS_TX_FLOW_EN | \
+ AR9331_SW_PORT_STATUS_SPEED_M)
+
+/* Phy bypass mode
+ * ------------------------------------------------------------------------
+ * Bit: | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 |11 |12 |13 |14 |15 |
+ *
+ * real | start | OP | PhyAddr | Reg Addr | TA |
+ * atheros| start | OP | 2'b00 |PhyAdd[2:0]| Reg Addr[4:0] | TA |
+ *
+ *
+ * Bit: |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |28 |29 |30 |31 |
+ * real | Data |
+ * atheros| Data |
+ *
+ * ------------------------------------------------------------------------
+ * Page address mode
+ * ------------------------------------------------------------------------
+ * Bit: | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 |11 |12 |13 |14 |15 |
+ * real | start | OP | PhyAddr | Reg Addr | TA |
+ * atheros| start | OP | 2'b11 | 8'b0 | TA |
+ *
+ * Bit: |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |28 |29 |30 |31 |
+ * real | Data |
+ * atheros| | Page [9:0] |
+ */
+/* In case of Page Address mode, Bit[18:9] of 32 bit register address should be
+ * written to bits[9:0] of mdio data register.
+ */
+#define AR9331_SW_ADDR_PAGE GENMASK(18, 9)
+
+/* ------------------------------------------------------------------------
+ * Normal register access mode
+ * ------------------------------------------------------------------------
+ * Bit: | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 |11 |12 |13 |14 |15 |
+ * real | start | OP | PhyAddr | Reg Addr | TA |
+ * atheros| start | OP | 2'b10 | low_addr[7:0] | TA |
+ *
+ * Bit: |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |28 |29 |30 |31 |
+ * real | Data |
+ * atheros| Data |
+ * ------------------------------------------------------------------------
+ */
+#define AR9331_SW_LOW_ADDR_PHY GENMASK(8, 6)
+#define AR9331_SW_LOW_ADDR_REG GENMASK(5, 1)
+
+#define AR9331_SW_MDIO_PHY_MODE_M GENMASK(4, 3)
+#define AR9331_SW_MDIO_PHY_MODE_PAGE 3
+#define AR9331_SW_MDIO_PHY_MODE_REG 2
+#define AR9331_SW_MDIO_PHY_MODE_BYPASS 0
+#define AR9331_SW_MDIO_PHY_ADDR_M GENMASK(2, 0)
+
+/* Empirical determined values */
+#define AR9331_SW_MDIO_POLL_SLEEP_US 1
+#define AR9331_SW_MDIO_POLL_TIMEOUT_US 20
+
+struct ar9331_sw_priv {
+ struct device *dev;
+ struct dsa_switch *ds;
+ struct dsa_switch_ops ops;
+ struct irq_domain *irqdomain;
+ struct mii_bus *mbus; /* mdio master */
+ struct mii_bus *sbus; /* mdio slave */
+ struct regmap *regmap;
+ struct reset_control *sw_reset;
+};
+
+/* Warning: switch reset will reset last AR9331_SW_MDIO_PHY_MODE_PAGE request
+ * If some kind of optimization is used, the request should be repeated.
+ */
+static int ar9331_sw_reset(struct ar9331_sw_priv *priv)
+{
+ int ret;
+
+ ret = reset_control_assert(priv->sw_reset);
+ if (ret)
+ goto error;
+
+ /* AR9331 doc do not provide any information about proper reset
+ * sequence. The AR8136 (the closes switch to the AR9331) doc says:
+ * reset duration should be greater than 10ms. So, let's use this value
+ * for now.
+ */
+ usleep_range(10000, 15000);
+ ret = reset_control_deassert(priv->sw_reset);
+ if (ret)
+ goto error;
+
+ return 0;
+error:
+ dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
+ return ret;
+}
+
+static int ar9331_sw_mbus_write(struct mii_bus *mbus, int port, int regnum,
+ u16 data)
+{
+ struct ar9331_sw_priv *priv = mbus->priv;
+ struct regmap *regmap = priv->regmap;
+ u32 val;
+ int ret;
+
+ ret = regmap_write(regmap, AR9331_SW_REG_MDIO_CTRL,
+ AR9331_SW_MDIO_CTRL_BUSY |
+ AR9331_SW_MDIO_CTRL_MASTER_EN |
+ FIELD_PREP(AR9331_SW_MDIO_CTRL_PHY_ADDR_M, port) |
+ FIELD_PREP(AR9331_SW_MDIO_CTRL_REG_ADDR_M, regnum) |
+ FIELD_PREP(AR9331_SW_MDIO_CTRL_DATA_M, data));
+ if (ret)
+ goto error;
+
+ ret = regmap_read_poll_timeout(regmap, AR9331_SW_REG_MDIO_CTRL, val,
+ !(val & AR9331_SW_MDIO_CTRL_BUSY),
+ AR9331_SW_MDIO_POLL_SLEEP_US,
+ AR9331_SW_MDIO_POLL_TIMEOUT_US);
+ if (ret)
+ goto error;
+
+ return 0;
+error:
+ dev_err_ratelimited(priv->dev, "PHY write error: %i\n", ret);
+ return ret;
+}
+
+static int ar9331_sw_mbus_read(struct mii_bus *mbus, int port, int regnum)
+{
+ struct ar9331_sw_priv *priv = mbus->priv;
+ struct regmap *regmap = priv->regmap;
+ u32 val;
+ int ret;
+
+ ret = regmap_write(regmap, AR9331_SW_REG_MDIO_CTRL,
+ AR9331_SW_MDIO_CTRL_BUSY |
+ AR9331_SW_MDIO_CTRL_MASTER_EN |
+ AR9331_SW_MDIO_CTRL_CMD_READ |
+ FIELD_PREP(AR9331_SW_MDIO_CTRL_PHY_ADDR_M, port) |
+ FIELD_PREP(AR9331_SW_MDIO_CTRL_REG_ADDR_M, regnum));
+ if (ret)
+ goto error;
+
+ ret = regmap_read_poll_timeout(regmap, AR9331_SW_REG_MDIO_CTRL, val,
+ !(val & AR9331_SW_MDIO_CTRL_BUSY),
+ AR9331_SW_MDIO_POLL_SLEEP_US,
+ AR9331_SW_MDIO_POLL_TIMEOUT_US);
+ if (ret)
+ goto error;
+
+ ret = regmap_read(regmap, AR9331_SW_REG_MDIO_CTRL, &val);
+ if (ret)
+ goto error;
+
+ return FIELD_GET(AR9331_SW_MDIO_CTRL_DATA_M, val);
+
+error:
+ dev_err_ratelimited(priv->dev, "PHY read error: %i\n", ret);
+ return ret;
+}
+
+static int ar9331_sw_mbus_init(struct ar9331_sw_priv *priv)
+{
+ struct device *dev = priv->dev;
+ static struct mii_bus *mbus;
+ struct device_node *np, *mnp;
+ int ret;
+
+ np = dev->of_node;
+
+ mbus = devm_mdiobus_alloc(dev);
+ if (!mbus)
+ return -ENOMEM;
+
+ mbus->name = np->full_name;
+ snprintf(mbus->id, MII_BUS_ID_SIZE, "%pOF", np);
+
+ mbus->read = ar9331_sw_mbus_read;
+ mbus->write = ar9331_sw_mbus_write;
+ mbus->priv = priv;
+ mbus->parent = dev;
+
+ mnp = of_get_child_by_name(np, "mdio");
+ ret = of_mdiobus_register(mbus, mnp);
+ of_node_put(mnp);
+ if (ret)
+ return ret;
+
+ priv->mbus = mbus;
+
+ return 0;
+}
+
+static int ar9331_sw_setup(struct dsa_switch *ds)
+{
+ struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
+ struct regmap *regmap = priv->regmap;
+ int ret;
+
+ ret = ar9331_sw_reset(priv);
+ if (ret)
+ return ret;
+
+ /* Reset will set proper defaults. CPU - Port0 will be enabled and
+ * configured. All other ports (ports 1 - 5) are disabled
+ */
+ ret = ar9331_sw_mbus_init(priv);
+ if (ret)
+ return ret;
+
+ /* Do not drop broadcast frames */
+ ret = regmap_write_bits(regmap, AR9331_SW_REG_FLOOD_MASK,
+ AR9331_SW_FLOOD_MASK_BROAD_TO_CPU,
+ AR9331_SW_FLOOD_MASK_BROAD_TO_CPU);
+ if (ret)
+ goto error;
+
+ /* Sync max frame size with value used in
+ * drivers/net/ethernet/atheros/ag71xx.c for ar9330 SoC.
+ * TODO: In both drivers this value seems to be not real maximal size
+ * The switch is able to configure 0x3fff and ethernet controller
+ * 0xffff. Are there any better way to sync this values?
+ */
+ ret = regmap_write_bits(regmap, AR9331_SW_REG_GLOBAL_CTRL,
+ AR9331_SW_GLOBAL_CTRL_MFS_M,
+ FIELD_PREP(AR9331_SW_GLOBAL_CTRL_MFS_M, 1540));
+ if (ret)
+ goto error;
+
+ return 0;
+error:
+ dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
+ return ret;
+}
+
+static int ar9331_sw_port_enable(struct dsa_switch *ds, int port,
+ struct phy_device *phy)
+{
+ struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
+ struct regmap *regmap = priv->regmap;
+ int ret;
+
+ /* nothing to enable. Just set link to initial state */
+ ret = regmap_write(regmap, AR9331_SW_REG_PORT_STATUS(port), 0);
+ if (ret)
+ dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
+
+ return ret;
+}
+
+static void ar9331_sw_port_disable(struct dsa_switch *ds, int port)
+{
+ struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
+ struct regmap *regmap = priv->regmap;
+ int ret;
+
+ ret = regmap_write(regmap, AR9331_SW_REG_PORT_STATUS(port), 0);
+ if (ret)
+ dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
+}
+
+static enum dsa_tag_protocol ar9331_sw_get_tag_protocol(struct dsa_switch *ds,
+ int port)
+{
+ return DSA_TAG_PROTO_AR9331;
+}
+
+static void ar9331_sw_phylink_validate(struct dsa_switch *ds, int port,
+ unsigned long *supported,
+ struct phylink_link_state *state)
+{
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
+
+ switch (port) {
+ case 0:
+ if (state->interface != PHY_INTERFACE_MODE_GMII)
+ goto unsupported;
+
+ phylink_set(mask, 1000baseT_Full);
+ phylink_set(mask, 1000baseT_Half);
+ break;
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ if (state->interface != PHY_INTERFACE_MODE_INTERNAL)
+ goto unsupported;
+ break;
+ default:
+ bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
+ dev_err(ds->dev, "Unsupported port: %i\n", port);
+ return;
+ }
+
+ phylink_set_port_modes(mask);
+ phylink_set(mask, Pause);
+ phylink_set(mask, Asym_Pause);
+
+ phylink_set(mask, 10baseT_Half);
+ phylink_set(mask, 10baseT_Full);
+ phylink_set(mask, 100baseT_Half);
+ phylink_set(mask, 100baseT_Full);
+
+ bitmap_and(supported, supported, mask,
+ __ETHTOOL_LINK_MODE_MASK_NBITS);
+ bitmap_and(state->advertising, state->advertising, mask,
+ __ETHTOOL_LINK_MODE_MASK_NBITS);
+
+ return;
+
+unsupported:
+ bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
+ dev_err(ds->dev, "Unsupported interface: %d, port: %d\n",
+ state->interface, port);
+}
+
+static void ar9331_sw_phylink_mac_config(struct dsa_switch *ds, int port,
+ unsigned int mode,
+ const struct phylink_link_state *state)
+{
+ struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
+ struct regmap *regmap = priv->regmap;
+ int ret;
+ u32 val;
+
+ switch (state->speed) {
+ case SPEED_1000:
+ val = AR9331_SW_PORT_STATUS_SPEED_1000;
+ break;
+ case SPEED_100:
+ val = AR9331_SW_PORT_STATUS_SPEED_100;
+ break;
+ case SPEED_10:
+ val = AR9331_SW_PORT_STATUS_SPEED_10;
+ break;
+ default:
+ return;
+ }
+
+ if (state->duplex)
+ val |= AR9331_SW_PORT_STATUS_DUPLEX_MODE;
+
+ if (state->pause & MLO_PAUSE_TX)
+ val |= AR9331_SW_PORT_STATUS_TX_FLOW_EN;
+
+ if (state->pause & MLO_PAUSE_RX)
+ val |= AR9331_SW_PORT_STATUS_RX_FLOW_EN;
+
+ ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_STATUS(port),
+ AR9331_SW_PORT_STATUS_LINK_MASK, val);
+ if (ret)
+ dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
+}
+
+static void ar9331_sw_phylink_mac_link_down(struct dsa_switch *ds, int port,
+ unsigned int mode,
+ phy_interface_t interface)
+{
+ struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
+ struct regmap *regmap = priv->regmap;
+ int ret;
+
+ ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_STATUS(port),
+ AR9331_SW_PORT_STATUS_MAC_MASK, 0);
+ if (ret)
+ dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
+}
+
+static void ar9331_sw_phylink_mac_link_up(struct dsa_switch *ds, int port,
+ unsigned int mode,
+ phy_interface_t interface,
+ struct phy_device *phydev)
+{
+ struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
+ struct regmap *regmap = priv->regmap;
+ int ret;
+
+ ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_STATUS(port),
+ AR9331_SW_PORT_STATUS_MAC_MASK,
+ AR9331_SW_PORT_STATUS_MAC_MASK);
+ if (ret)
+ dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
+}
+
+static const struct dsa_switch_ops ar9331_sw_ops = {
+ .get_tag_protocol = ar9331_sw_get_tag_protocol,
+ .setup = ar9331_sw_setup,
+ .port_enable = ar9331_sw_port_enable,
+ .port_disable = ar9331_sw_port_disable,
+ .phylink_validate = ar9331_sw_phylink_validate,
+ .phylink_mac_config = ar9331_sw_phylink_mac_config,
+ .phylink_mac_link_down = ar9331_sw_phylink_mac_link_down,
+ .phylink_mac_link_up = ar9331_sw_phylink_mac_link_up,
+};
+
+static irqreturn_t ar9331_sw_irq(int irq, void *data)
+{
+ struct ar9331_sw_priv *priv = data;
+ struct regmap *regmap = priv->regmap;
+ u32 stat;
+ int ret;
+
+ ret = regmap_read(regmap, AR9331_SW_REG_GINT, &stat);
+ if (ret) {
+ dev_err(priv->dev, "can't read interrupt status\n");
+ return IRQ_NONE;
+ }
+
+ if (!stat)
+ return IRQ_NONE;
+
+ if (stat & AR9331_SW_GINT_PHY_INT) {
+ int child_irq;
+
+ child_irq = irq_find_mapping(priv->irqdomain, 0);
+ handle_nested_irq(child_irq);
+ }
+
+ ret = regmap_write(regmap, AR9331_SW_REG_GINT, stat);
+ if (ret) {
+ dev_err(priv->dev, "can't write interrupt status\n");
+ return IRQ_NONE;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void ar9331_sw_mask_irq(struct irq_data *d)
+{
+ struct ar9331_sw_priv *priv = irq_data_get_irq_chip_data(d);
+ struct regmap *regmap = priv->regmap;
+ int ret;
+
+ ret = regmap_update_bits(regmap, AR9331_SW_REG_GINT_MASK,
+ AR9331_SW_GINT_PHY_INT, 0);
+ if (ret)
+ dev_err(priv->dev, "could not mask IRQ\n");
+}
+
+static void ar9331_sw_unmask_irq(struct irq_data *d)
+{
+ struct ar9331_sw_priv *priv = irq_data_get_irq_chip_data(d);
+ struct regmap *regmap = priv->regmap;
+ int ret;
+
+ ret = regmap_update_bits(regmap, AR9331_SW_REG_GINT_MASK,
+ AR9331_SW_GINT_PHY_INT,
+ AR9331_SW_GINT_PHY_INT);
+ if (ret)
+ dev_err(priv->dev, "could not unmask IRQ\n");
+}
+
+static struct irq_chip ar9331_sw_irq_chip = {
+ .name = AR9331_SW_NAME,
+ .irq_mask = ar9331_sw_mask_irq,
+ .irq_unmask = ar9331_sw_unmask_irq,
+};
+
+static int ar9331_sw_irq_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_data(irq, domain->host_data);
+ irq_set_chip_and_handler(irq, &ar9331_sw_irq_chip, handle_simple_irq);
+ irq_set_nested_thread(irq, 1);
+ irq_set_noprobe(irq);
+
+ return 0;
+}
+
+static void ar9331_sw_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+ irq_set_nested_thread(irq, 0);
+ irq_set_chip_and_handler(irq, NULL, NULL);
+ irq_set_chip_data(irq, NULL);
+}
+
+static const struct irq_domain_ops ar9331_sw_irqdomain_ops = {
+ .map = ar9331_sw_irq_map,
+ .unmap = ar9331_sw_irq_unmap,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static int ar9331_sw_irq_init(struct ar9331_sw_priv *priv)
+{
+ struct device_node *np = priv->dev->of_node;
+ struct device *dev = priv->dev;
+ int ret, irq;
+
+ irq = of_irq_get(np, 0);
+ if (irq <= 0) {
+ dev_err(dev, "failed to get parent IRQ\n");
+ return irq ? irq : -EINVAL;
+ }
+
+ ret = devm_request_threaded_irq(dev, irq, NULL, ar9331_sw_irq,
+ IRQF_ONESHOT, AR9331_SW_NAME, priv);
+ if (ret) {
+ dev_err(dev, "unable to request irq: %d\n", ret);
+ return ret;
+ }
+
+ priv->irqdomain = irq_domain_add_linear(np, 1, &ar9331_sw_irqdomain_ops,
+ priv);
+ if (!priv->irqdomain) {
+ dev_err(dev, "failed to create IRQ domain\n");
+ return -EINVAL;
+ }
+
+ irq_set_parent(irq_create_mapping(priv->irqdomain, 0), irq);
+
+ return 0;
+}
+
+static int __ar9331_mdio_write(struct mii_bus *sbus, u8 mode, u16 reg, u16 val)
+{
+ u8 r, p;
+
+ p = FIELD_PREP(AR9331_SW_MDIO_PHY_MODE_M, mode) |
+ FIELD_GET(AR9331_SW_LOW_ADDR_PHY, reg);
+ r = FIELD_GET(AR9331_SW_LOW_ADDR_REG, reg);
+
+ return sbus->write(sbus, p, r, val);
+}
+
+static int __ar9331_mdio_read(struct mii_bus *sbus, u16 reg)
+{
+ u8 r, p;
+
+ p = FIELD_PREP(AR9331_SW_MDIO_PHY_MODE_M, AR9331_SW_MDIO_PHY_MODE_REG) |
+ FIELD_GET(AR9331_SW_LOW_ADDR_PHY, reg);
+ r = FIELD_GET(AR9331_SW_LOW_ADDR_REG, reg);
+
+ return sbus->read(sbus, p, r);
+}
+
+static int ar9331_mdio_read(void *ctx, const void *reg_buf, size_t reg_len,
+ void *val_buf, size_t val_len)
+{
+ struct ar9331_sw_priv *priv = ctx;
+ struct mii_bus *sbus = priv->sbus;
+ u32 reg = *(u32 *)reg_buf;
+ int ret;
+
+ if (reg == AR9331_SW_REG_PAGE) {
+ /* We cannot read the page selector register from hardware and
+ * we cache its value in regmap. Return all bits set here,
+ * that regmap will always write the page on first use.
+ */
+ *(u32 *)val_buf = GENMASK(9, 0);
+ return 0;
+ }
+
+ ret = __ar9331_mdio_read(sbus, reg);
+ if (ret < 0)
+ goto error;
+
+ *(u32 *)val_buf = ret;
+ ret = __ar9331_mdio_read(sbus, reg + 2);
+ if (ret < 0)
+ goto error;
+
+ *(u32 *)val_buf |= ret << 16;
+
+ return 0;
+error:
+ dev_err_ratelimited(&sbus->dev, "Bus error. Failed to read register.\n");
+ return ret;
+}
+
+static int ar9331_mdio_write(void *ctx, u32 reg, u32 val)
+{
+ struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ctx;
+ struct mii_bus *sbus = priv->sbus;
+ int ret;
+
+ if (reg == AR9331_SW_REG_PAGE) {
+ ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_PAGE,
+ 0, val);
+ if (ret < 0)
+ goto error;
+
+ return 0;
+ }
+
+ ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_REG, reg, val);
+ if (ret < 0)
+ goto error;
+
+ ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_REG, reg + 2,
+ val >> 16);
+ if (ret < 0)
+ goto error;
+
+ return 0;
+error:
+ dev_err_ratelimited(&sbus->dev, "Bus error. Failed to write register.\n");
+ return ret;
+}
+
+static int ar9331_sw_bus_write(void *context, const void *data, size_t count)
+{
+ u32 reg = *(u32 *)data;
+ u32 val = *((u32 *)data + 1);
+
+ return ar9331_mdio_write(context, reg, val);
+}
+
+static const struct regmap_range ar9331_valid_regs[] = {
+ regmap_reg_range(0x0, 0x0),
+ regmap_reg_range(0x10, 0x14),
+ regmap_reg_range(0x20, 0x24),
+ regmap_reg_range(0x2c, 0x30),
+ regmap_reg_range(0x40, 0x44),
+ regmap_reg_range(0x50, 0x78),
+ regmap_reg_range(0x80, 0x98),
+
+ regmap_reg_range(0x100, 0x120),
+ regmap_reg_range(0x200, 0x220),
+ regmap_reg_range(0x300, 0x320),
+ regmap_reg_range(0x400, 0x420),
+ regmap_reg_range(0x500, 0x520),
+ regmap_reg_range(0x600, 0x620),
+
+ regmap_reg_range(0x20000, 0x200a4),
+ regmap_reg_range(0x20100, 0x201a4),
+ regmap_reg_range(0x20200, 0x202a4),
+ regmap_reg_range(0x20300, 0x203a4),
+ regmap_reg_range(0x20400, 0x204a4),
+ regmap_reg_range(0x20500, 0x205a4),
+
+ /* dummy page selector reg */
+ regmap_reg_range(AR9331_SW_REG_PAGE, AR9331_SW_REG_PAGE),
+};
+
+static const struct regmap_range ar9331_nonvolatile_regs[] = {
+ regmap_reg_range(AR9331_SW_REG_PAGE, AR9331_SW_REG_PAGE),
+};
+
+static const struct regmap_range_cfg ar9331_regmap_range[] = {
+ {
+ .selector_reg = AR9331_SW_REG_PAGE,
+ .selector_mask = GENMASK(9, 0),
+ .selector_shift = 0,
+
+ .window_start = 0,
+ .window_len = 512,
+
+ .range_min = 0,
+ .range_max = AR9331_SW_REG_PAGE - 4,
+ },
+};
+
+static const struct regmap_access_table ar9331_register_set = {
+ .yes_ranges = ar9331_valid_regs,
+ .n_yes_ranges = ARRAY_SIZE(ar9331_valid_regs),
+};
+
+static const struct regmap_access_table ar9331_volatile_set = {
+ .no_ranges = ar9331_nonvolatile_regs,
+ .n_no_ranges = ARRAY_SIZE(ar9331_nonvolatile_regs),
+};
+
+static const struct regmap_config ar9331_mdio_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = AR9331_SW_REG_PAGE,
+
+ .ranges = ar9331_regmap_range,
+ .num_ranges = ARRAY_SIZE(ar9331_regmap_range),
+
+ .volatile_table = &ar9331_volatile_set,
+ .wr_table = &ar9331_register_set,
+ .rd_table = &ar9331_register_set,
+
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static struct regmap_bus ar9331_sw_bus = {
+ .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
+ .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+ .read = ar9331_mdio_read,
+ .write = ar9331_sw_bus_write,
+ .max_raw_read = 4,
+ .max_raw_write = 4,
+};
+
+static int ar9331_sw_probe(struct mdio_device *mdiodev)
+{
+ struct ar9331_sw_priv *priv;
+ int ret;
+
+ /* allocate the private data struct so that we can probe the switches
+ * ID register
+ */
+ priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->regmap = devm_regmap_init(&mdiodev->dev, &ar9331_sw_bus, priv,
+ &ar9331_mdio_regmap_config);
+ if (IS_ERR(priv->regmap)) {
+ ret = PTR_ERR(priv->regmap);
+ dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
+ return ret;
+ }
+
+ priv->sw_reset = devm_reset_control_get(&mdiodev->dev, "switch");
+ if (IS_ERR(priv->sw_reset)) {
+ dev_err(&mdiodev->dev, "missing switch reset\n");
+ return PTR_ERR(priv->sw_reset);
+ }
+
+ priv->sbus = mdiodev->bus;
+ priv->dev = &mdiodev->dev;
+
+ ret = ar9331_sw_irq_init(priv);
+ if (ret)
+ return ret;
+
+ priv->ds = dsa_switch_alloc(&mdiodev->dev, AR9331_SW_PORTS);
+ if (!priv->ds)
+ return -ENOMEM;
+
+ priv->ds->priv = priv;
+ priv->ops = ar9331_sw_ops;
+ priv->ds->ops = &priv->ops;
+ dev_set_drvdata(&mdiodev->dev, priv);
+
+ return dsa_register_switch(priv->ds);
+}
+
+static void ar9331_sw_remove(struct mdio_device *mdiodev)
+{
+ struct ar9331_sw_priv *priv = dev_get_drvdata(&mdiodev->dev);
+
+ mdiobus_unregister(priv->mbus);
+ dsa_unregister_switch(priv->ds);
+
+ reset_control_assert(priv->sw_reset);
+}
+
+static const struct of_device_id ar9331_sw_of_match[] = {
+ { .compatible = "qca,ar9331-switch" },
+ { },
+};
+
+static struct mdio_driver ar9331_sw_mdio_driver = {
+ .probe = ar9331_sw_probe,
+ .remove = ar9331_sw_remove,
+ .mdiodrv.driver = {
+ .name = AR9331_SW_NAME,
+ .of_match_table = ar9331_sw_of_match,
+ },
+};
+
+mdio_module_driver(ar9331_sw_mdio_driver);
+
+MODULE_AUTHOR("Oleksij Rempel <kernel@pengutronix.de>");
+MODULE_DESCRIPTION("Driver for Atheros AR9331 switch");
+MODULE_LICENSE("GPL v2");
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 541fb514e31d..89a334e68d42 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -42,6 +42,7 @@ struct phylink_link_state;
#define DSA_TAG_PROTO_8021Q_VALUE 12
#define DSA_TAG_PROTO_SJA1105_VALUE 13
#define DSA_TAG_PROTO_KSZ8795_VALUE 14
+#define DSA_TAG_PROTO_AR9331_VALUE 15

enum dsa_tag_protocol {
DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE,
@@ -59,6 +60,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_8021Q = DSA_TAG_PROTO_8021Q_VALUE,
DSA_TAG_PROTO_SJA1105 = DSA_TAG_PROTO_SJA1105_VALUE,
DSA_TAG_PROTO_KSZ8795 = DSA_TAG_PROTO_KSZ8795_VALUE,
+ DSA_TAG_PROTO_AR9331 = DSA_TAG_PROTO_AR9331_VALUE,
};

struct packet_type;
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 29e2bd5cc5af..6e015309a7fe 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -107,4 +107,10 @@ config NET_DSA_TAG_TRAILER
Say Y or M if you want to enable support for tagging frames at
with a trailed. e.g. Marvell 88E6060.

+config NET_DSA_TAG_AR9331
+ tristate "Tag driver for Atheros AR9331 SoC with build-in switch"
+ help
+ Say Y or M if you want to enable support for tagging frames for
+ the Atheros AR9331 SoC with build-in switch.
+
endif
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 2c6d286f0511..67caebf602be 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -15,3 +15,4 @@ obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o
obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
+obj-$(CONFIG_NET_DSA_TAG_AR9331) += tag_ar9331.o
diff --git a/net/dsa/tag_ar9331.c b/net/dsa/tag_ar9331.c
new file mode 100644
index 000000000000..b32a8d3d48b9
--- /dev/null
+++ b/net/dsa/tag_ar9331.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
+ */
+
+
+#include <linux/bitfield.h>
+#include <linux/etherdevice.h>
+
+#include "dsa_priv.h"
+
+#define AR9331_HDR_LEN 2
+#define AR9331_HDR_VERSION 1
+
+#define AR9331_HDR_VERSION_MASK GENMASK(15, 14)
+#define AR9331_HDR_PRIORITY_MASK GENMASK(13, 12)
+#define AR9331_HDR_TYPE_MASK GENMASK(10, 8)
+#define AR9331_HDR_BROADCAST BIT(7)
+#define AR9331_HDR_FROM_CPU BIT(6)
+/* AR9331_HDR_RESERVED - not used or may be version filed.
+ * According to the AR8216 doc it should 0b10. On AR9331 it is 0b11 on RX path
+ * and should be set to 0b11 to make it work.
+ */
+#define AR9331_HDR_RESERVED_MASK GENMASK(5, 4)
+#define AR9331_HDR_PORT_NUM_MASK GENMASK(3, 0)
+
+static struct sk_buff *ar9331_tag_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct dsa_port *dp = dsa_slave_to_port(dev);
+ __le16 *phdr;
+ u16 hdr;
+
+ if (skb_cow_head(skb, 0) < 0)
+ return NULL;
+
+ phdr = skb_push(skb, AR9331_HDR_LEN);
+
+ hdr = FIELD_PREP(AR9331_HDR_VERSION_MASK, AR9331_HDR_VERSION);
+ hdr |= AR9331_HDR_FROM_CPU | dp->index;
+ /* 0b10 for AR8216 and 0b11 for AR9331 */
+ hdr |= AR9331_HDR_RESERVED_MASK;
+
+ phdr[0] = cpu_to_le16(hdr);
+
+ return skb;
+}
+
+static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb,
+ struct net_device *ndev,
+ struct packet_type *pt)
+{
+ u8 ver, port;
+ u16 hdr;
+
+ if (unlikely(!pskb_may_pull(skb, AR9331_HDR_LEN)))
+ return NULL;
+
+ hdr = le16_to_cpu(*(__le16 *)skb_mac_header(skb));
+
+ ver = FIELD_GET(AR9331_HDR_VERSION_MASK, hdr);
+ if (unlikely(ver != AR9331_HDR_VERSION)) {
+ netdev_warn(ndev, "%s:%i wrong header version 0x%2x\n",
+ __func__, __LINE__, hdr);
+ return NULL;
+ }
+
+ if (unlikely(hdr & AR9331_HDR_FROM_CPU)) {
+ netdev_warn(ndev, "%s:%i packet should not be from cpu 0x%2x\n",
+ __func__, __LINE__, hdr);
+ return NULL;
+ }
+
+ skb_pull(skb, AR9331_HDR_LEN);
+ skb_set_mac_header(skb, -ETH_HLEN);
+
+ /* Get source port information */
+ port = FIELD_GET(AR9331_HDR_PORT_NUM_MASK, hdr);
+
+ skb->dev = dsa_master_find_slave(ndev, 0, port);
+ if (!skb->dev)
+ return NULL;
+
+ return skb;
+}
+
+static const struct dsa_device_ops ar9331_netdev_ops = {
+ .name = "ar9331",
+ .proto = DSA_TAG_PROTO_AR9331,
+ .xmit = ar9331_tag_xmit,
+ .rcv = ar9331_tag_rcv,
+ .overhead = AR9331_HDR_LEN,
+};
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_AR9331);
+module_dsa_tag_driver(ar9331_netdev_ops);
--
2.23.0
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