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kernel/drivers/net/dsa/qca/ar9331.c

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// SPDX-License-Identifier: GPL-2.0-only
// Copyright (c) 2019 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
/*
* +----------------------+
* GMAC1----RGMII----|--MAC0 |
* \---MDIO1----|--REGs |----MDIO3----\
* | | | +------+
* | | +--| |
* | MAC1-|----RMII--M-----| PHY0 |-o P0
* | | | | +------+
* | | | +--| |
* | MAC2-|----RMII--------| PHY1 |-o P1
* | | | | +------+
* | | | +--| |
* | MAC3-|----RMII--------| PHY2 |-o P2
* | | | | +------+
* | | | +--| |
* | MAC4-|----RMII--------| PHY3 |-o P3
* | | | | +------+
* | | | +--| |
* | MAC5-|--+-RMII--M-----|-PHY4-|-o P4
* | | | | +------+
* +----------------------+ | \--CFG_SW_PHY_SWAP
* GMAC0---------------RMII--------------------/ \-CFG_SW_PHY_ADDR_SWAP
* \---MDIO0--NC
*
* GMAC0 and MAC5 are connected together and use same PHY. Depending on
* configuration it can be PHY4 (default) or PHY0. Only GMAC0 or MAC5 can be
* used at same time. If GMAC0 is used (default) then MAC5 should be disabled.
*
* CFG_SW_PHY_SWAP - swap connections of PHY0 and PHY4. If this bit is not set
* PHY4 is connected to GMAC0/MAC5 bundle and PHY0 is connected to MAC1. If this
* bit is set, PHY4 is connected to MAC1 and PHY0 is connected to GMAC0/MAC5
* bundle.
*
* CFG_SW_PHY_ADDR_SWAP - swap addresses of PHY0 and PHY4
*
* CFG_SW_PHY_SWAP and CFG_SW_PHY_ADDR_SWAP are part of SoC specific register
* set and not related to switch internal registers.
*/
#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 0x40000
/* 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_DUPLEX_MODE | \
AR9331_SW_PORT_STATUS_RX_FLOW_EN | AR9331_SW_PORT_STATUS_TX_FLOW_EN | \
AR9331_SW_PORT_STATUS_SPEED_M)
#define AR9331_SW_REG_PORT_CTRL(_port) (0x104 + (_port) * 0x100)
#define AR9331_SW_PORT_CTRL_HEAD_EN BIT(11)
#define AR9331_SW_PORT_CTRL_PORT_STATE GENMASK(2, 0)
#define AR9331_SW_PORT_CTRL_PORT_STATE_DISABLED 0
#define AR9331_SW_PORT_CTRL_PORT_STATE_BLOCKING 1
#define AR9331_SW_PORT_CTRL_PORT_STATE_LISTENING 2
#define AR9331_SW_PORT_CTRL_PORT_STATE_LEARNING 3
#define AR9331_SW_PORT_CTRL_PORT_STATE_FORWARD 4
#define AR9331_SW_REG_PORT_VLAN(_port) (0x108 + (_port) * 0x100)
#define AR9331_SW_PORT_VLAN_8021Q_MODE GENMASK(31, 30)
#define AR9331_SW_8021Q_MODE_SECURE 3
#define AR9331_SW_8021Q_MODE_CHECK 2
#define AR9331_SW_8021Q_MODE_FALLBACK 1
#define AR9331_SW_8021Q_MODE_NONE 0
#define AR9331_SW_PORT_VLAN_PORT_VID_MEMBER GENMASK(25, 16)
/* MIB registers */
#define AR9331_MIB_COUNTER(x) (0x20000 + ((x) * 0x100))
/* 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
/* The interval should be small enough to avoid overflow of 32bit MIBs */
/*
* FIXME: until we can read MIBs from stats64 call directly (i.e. sleep
* there), we have to poll stats more frequently then it is actually needed.
* For overflow protection, normally, 100 sec interval should have been OK.
*/
#define STATS_INTERVAL_JIFFIES (3 * HZ)
struct ar9331_sw_stats_raw {
u32 rxbroad; /* 0x00 */
u32 rxpause; /* 0x04 */
u32 rxmulti; /* 0x08 */
u32 rxfcserr; /* 0x0c */
u32 rxalignerr; /* 0x10 */
u32 rxrunt; /* 0x14 */
u32 rxfragment; /* 0x18 */
u32 rx64byte; /* 0x1c */
u32 rx128byte; /* 0x20 */
u32 rx256byte; /* 0x24 */
u32 rx512byte; /* 0x28 */
u32 rx1024byte; /* 0x2c */
u32 rx1518byte; /* 0x30 */
u32 rxmaxbyte; /* 0x34 */
u32 rxtoolong; /* 0x38 */
u32 rxgoodbyte; /* 0x3c */
u32 rxgoodbyte_hi;
u32 rxbadbyte; /* 0x44 */
u32 rxbadbyte_hi;
u32 rxoverflow; /* 0x4c */
u32 filtered; /* 0x50 */
u32 txbroad; /* 0x54 */
u32 txpause; /* 0x58 */
u32 txmulti; /* 0x5c */
u32 txunderrun; /* 0x60 */
u32 tx64byte; /* 0x64 */
u32 tx128byte; /* 0x68 */
u32 tx256byte; /* 0x6c */
u32 tx512byte; /* 0x70 */
u32 tx1024byte; /* 0x74 */
u32 tx1518byte; /* 0x78 */
u32 txmaxbyte; /* 0x7c */
u32 txoversize; /* 0x80 */
u32 txbyte; /* 0x84 */
u32 txbyte_hi;
u32 txcollision; /* 0x8c */
u32 txabortcol; /* 0x90 */
u32 txmulticol; /* 0x94 */
u32 txsinglecol; /* 0x98 */
u32 txexcdefer; /* 0x9c */
u32 txdefer; /* 0xa0 */
u32 txlatecol; /* 0xa4 */
};
struct ar9331_sw_port {
int idx;
struct delayed_work mib_read;
struct rtnl_link_stats64 stats;
struct spinlock stats_lock;
};
struct ar9331_sw_priv {
struct device *dev;
struct dsa_switch ds;
struct dsa_switch_ops ops;
struct irq_domain *irqdomain;
u32 irq_mask;
struct mutex lock_irq;
struct mii_bus *mbus; /* mdio master */
struct mii_bus *sbus; /* mdio slave */
struct regmap *regmap;
struct reset_control *sw_reset;
struct ar9331_sw_port port[AR9331_SW_PORTS];
};
static struct ar9331_sw_priv *ar9331_sw_port_to_priv(struct ar9331_sw_port *port)
{
struct ar9331_sw_port *p = port - port->idx;
return (struct ar9331_sw_priv *)((void *)p -
offsetof(struct ar9331_sw_priv, port));
}
/* 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;
/* There is no information on how long should we wait after reset.
* AR8136 has an EEPROM and there is an Interrupt for EEPROM load
* status. AR9331 has no EEPROM support.
* For now, do not wait. In case AR8136 will be needed, the after
* reset delay can be added as well.
*/
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;
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");
if (!mnp)
return -ENODEV;
ret = of_mdiobus_register(mbus, mnp);
of_node_put(mnp);
if (ret)
return ret;
priv->mbus = mbus;
return 0;
}
static int ar9331_sw_setup_port(struct dsa_switch *ds, int port)
{
struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
struct regmap *regmap = priv->regmap;
u32 port_mask, port_ctrl, val;
int ret;
/* Generate default port settings */
port_ctrl = FIELD_PREP(AR9331_SW_PORT_CTRL_PORT_STATE,
AR9331_SW_PORT_CTRL_PORT_STATE_FORWARD);
if (dsa_is_cpu_port(ds, port)) {
/* CPU port should be allowed to communicate with all user
* ports.
*/
port_mask = dsa_user_ports(ds);
/* Enable Atheros header on CPU port. This will allow us
* communicate with each port separately
*/
port_ctrl |= AR9331_SW_PORT_CTRL_HEAD_EN;
} else if (dsa_is_user_port(ds, port)) {
/* User ports should communicate only with the CPU port.
*/
port_mask = BIT(dsa_upstream_port(ds, port));
} else {
/* Other ports do not need to communicate at all */
port_mask = 0;
}
val = FIELD_PREP(AR9331_SW_PORT_VLAN_8021Q_MODE,
AR9331_SW_8021Q_MODE_NONE) |
FIELD_PREP(AR9331_SW_PORT_VLAN_PORT_VID_MEMBER, port_mask);
ret = regmap_write(regmap, AR9331_SW_REG_PORT_VLAN(port), val);
if (ret)
goto error;
ret = regmap_write(regmap, AR9331_SW_REG_PORT_CTRL(port), port_ctrl);
if (ret)
goto error;
return 0;
error:
dev_err(priv->dev, "%s: error: %i\n", __func__, ret);
return ret;
}
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, i;
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;
/* Set max frame size to the maximum supported value */
ret = regmap_write_bits(regmap, AR9331_SW_REG_GLOBAL_CTRL,
AR9331_SW_GLOBAL_CTRL_MFS_M,
AR9331_SW_GLOBAL_CTRL_MFS_M);
if (ret)
goto error;
for (i = 0; i < ds->num_ports; i++) {
ret = ar9331_sw_setup_port(ds, i);
if (ret)
goto error;
}
ds->configure_vlan_while_not_filtering = false;
return 0;
error:
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,
enum dsa_tag_protocol m)
{
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;
ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_STATUS(port),
AR9331_SW_PORT_STATUS_LINK_EN |
AR9331_SW_PORT_STATUS_FLOW_LINK_EN, 0);
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 ar9331_sw_port *p = &priv->port[port];
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);
cancel_delayed_work_sync(&p->mib_read);
}
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,
int speed, int duplex,
bool tx_pause, bool rx_pause)
{
struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
struct ar9331_sw_port *p = &priv->port[port];
struct regmap *regmap = priv->regmap;
u32 val;
int ret;
schedule_delayed_work(&p->mib_read, 0);
val = AR9331_SW_PORT_STATUS_MAC_MASK;
switch (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 (duplex)
val |= AR9331_SW_PORT_STATUS_DUPLEX_MODE;
if (tx_pause)
val |= AR9331_SW_PORT_STATUS_TX_FLOW_EN;
if (rx_pause)
val |= AR9331_SW_PORT_STATUS_RX_FLOW_EN;
ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_STATUS(port),
AR9331_SW_PORT_STATUS_MAC_MASK |
AR9331_SW_PORT_STATUS_LINK_MASK,
val);
if (ret)
dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
}
static void ar9331_read_stats(struct ar9331_sw_port *port)
{
struct ar9331_sw_priv *priv = ar9331_sw_port_to_priv(port);
struct rtnl_link_stats64 *stats = &port->stats;
struct ar9331_sw_stats_raw raw;
int ret;
/* Do the slowest part first, to avoid needless locking for long time */
ret = regmap_bulk_read(priv->regmap, AR9331_MIB_COUNTER(port->idx),
&raw, sizeof(raw) / sizeof(u32));
if (ret) {
dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
return;
}
/* All MIB counters are cleared automatically on read */
spin_lock(&port->stats_lock);
stats->rx_bytes += raw.rxgoodbyte;
stats->tx_bytes += raw.txbyte;
stats->rx_packets += raw.rx64byte + raw.rx128byte + raw.rx256byte +
raw.rx512byte + raw.rx1024byte + raw.rx1518byte + raw.rxmaxbyte;
stats->tx_packets += raw.tx64byte + raw.tx128byte + raw.tx256byte +
raw.tx512byte + raw.tx1024byte + raw.tx1518byte + raw.txmaxbyte;
stats->rx_length_errors += raw.rxrunt + raw.rxfragment + raw.rxtoolong;
stats->rx_crc_errors += raw.rxfcserr;
stats->rx_frame_errors += raw.rxalignerr;
stats->rx_missed_errors += raw.rxoverflow;
stats->rx_dropped += raw.filtered;
stats->rx_errors += raw.rxfcserr + raw.rxalignerr + raw.rxrunt +
raw.rxfragment + raw.rxoverflow + raw.rxtoolong;
stats->tx_window_errors += raw.txlatecol;
stats->tx_fifo_errors += raw.txunderrun;
stats->tx_aborted_errors += raw.txabortcol;
stats->tx_errors += raw.txoversize + raw.txabortcol + raw.txunderrun +
raw.txlatecol;
stats->multicast += raw.rxmulti;
stats->collisions += raw.txcollision;
spin_unlock(&port->stats_lock);
}
static void ar9331_do_stats_poll(struct work_struct *work)
{
struct ar9331_sw_port *port = container_of(work, struct ar9331_sw_port,
mib_read.work);
ar9331_read_stats(port);
schedule_delayed_work(&port->mib_read, STATS_INTERVAL_JIFFIES);
}
static void ar9331_get_stats64(struct dsa_switch *ds, int port,
struct rtnl_link_stats64 *s)
{
struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
struct ar9331_sw_port *p = &priv->port[port];
spin_lock(&p->stats_lock);
memcpy(s, &p->stats, sizeof(*s));
spin_unlock(&p->stats_lock);
}
static const struct dsa_switch_ops ar9331_sw_ops = {
.get_tag_protocol = ar9331_sw_get_tag_protocol,
.setup = ar9331_sw_setup,
.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,
.get_stats64 = ar9331_get_stats64,
};
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);
priv->irq_mask = 0;
}
static void ar9331_sw_unmask_irq(struct irq_data *d)
{
struct ar9331_sw_priv *priv = irq_data_get_irq_chip_data(d);
priv->irq_mask = AR9331_SW_GINT_PHY_INT;
}
static void ar9331_sw_irq_bus_lock(struct irq_data *d)
{
struct ar9331_sw_priv *priv = irq_data_get_irq_chip_data(d);
mutex_lock(&priv->lock_irq);
}
static void ar9331_sw_irq_bus_sync_unlock(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, priv->irq_mask);
if (ret)
dev_err(priv->dev, "failed to change IRQ mask\n");
mutex_unlock(&priv->lock_irq);
}
static struct irq_chip ar9331_sw_irq_chip = {
.name = AR9331_SW_NAME,
.irq_mask = ar9331_sw_mask_irq,
.irq_unmask = ar9331_sw_unmask_irq,
.irq_bus_lock = ar9331_sw_irq_bus_lock,
.irq_bus_sync_unlock = ar9331_sw_irq_bus_sync_unlock,
};
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;
}
mutex_init(&priv->lock_irq);
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 mdiobus_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 mdiobus_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;
}
/* In case of this switch we work with 32bit registers on top of 16bit
* bus. Some registers (for example access to forwarding database) have
* trigger bit on the first 16bit half of request, the result and
* configuration of request in the second half.
* To make it work properly, we should do the second part of transfer
* before the first one is done.
*/
ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_REG, reg + 2,
val >> 16);
if (ret < 0)
goto error;
ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_REG, reg, val);
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;
struct dsa_switch *ds;
int ret, i;
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;
ds = &priv->ds;
ds->dev = &mdiodev->dev;
ds->num_ports = AR9331_SW_PORTS;
ds->priv = priv;
priv->ops = ar9331_sw_ops;
ds->ops = &priv->ops;
dev_set_drvdata(&mdiodev->dev, priv);
for (i = 0; i < ARRAY_SIZE(priv->port); i++) {
struct ar9331_sw_port *port = &priv->port[i];
port->idx = i;
spin_lock_init(&port->stats_lock);
INIT_DELAYED_WORK(&port->mib_read, ar9331_do_stats_poll);
}
ret = dsa_register_switch(ds);
if (ret)
goto err_remove_irq;
return 0;
err_remove_irq:
irq_domain_remove(priv->irqdomain);
return ret;
}
static void ar9331_sw_remove(struct mdio_device *mdiodev)
{
struct ar9331_sw_priv *priv = dev_get_drvdata(&mdiodev->dev);
unsigned int i;
for (i = 0; i < ARRAY_SIZE(priv->port); i++) {
struct ar9331_sw_port *port = &priv->port[i];
cancel_delayed_work_sync(&port->mib_read);
}
irq_domain_remove(priv->irqdomain);
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");
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