// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/* Copyright (c) 2016-2019 Mellanox Technologies. All rights reserved */
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/types.h>
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#include "core.h"
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#include "core_env.h"
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#include "i2c.h"
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static const char mlxsw_m_driver_name[] = "mlxsw_minimal";
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#define MLXSW_M_FWREV_MINOR 2000
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#define MLXSW_M_FWREV_SUBMINOR 1886
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static const struct mlxsw_fw_rev mlxsw_m_fw_rev = {
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.minor = MLXSW_M_FWREV_MINOR,
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.subminor = MLXSW_M_FWREV_SUBMINOR,
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};
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struct mlxsw_m_port;
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struct mlxsw_m {
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struct mlxsw_m_port **ports;
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int *module_to_port;
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struct mlxsw_core *core;
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const struct mlxsw_bus_info *bus_info;
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u8 base_mac[ETH_ALEN];
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u8 max_ports;
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};
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struct mlxsw_m_port {
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struct net_device *dev;
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struct mlxsw_m *mlxsw_m;
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u8 local_port;
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u8 module;
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};
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static int mlxsw_m_base_mac_get(struct mlxsw_m *mlxsw_m)
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{
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char spad_pl[MLXSW_REG_SPAD_LEN] = {0};
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int err;
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err = mlxsw_reg_query(mlxsw_m->core, MLXSW_REG(spad), spad_pl);
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if (err)
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return err;
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mlxsw_reg_spad_base_mac_memcpy_from(spad_pl, mlxsw_m->base_mac);
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return 0;
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}
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static int mlxsw_m_port_dummy_open_stop(struct net_device *dev)
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{
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return 0;
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}
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static struct devlink_port *
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mlxsw_m_port_get_devlink_port(struct net_device *dev)
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{
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struct mlxsw_m_port *mlxsw_m_port = netdev_priv(dev);
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struct mlxsw_m *mlxsw_m = mlxsw_m_port->mlxsw_m;
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return mlxsw_core_port_devlink_port_get(mlxsw_m->core,
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mlxsw_m_port->local_port);
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}
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static const struct net_device_ops mlxsw_m_port_netdev_ops = {
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.ndo_open = mlxsw_m_port_dummy_open_stop,
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.ndo_stop = mlxsw_m_port_dummy_open_stop,
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.ndo_get_devlink_port = mlxsw_m_port_get_devlink_port,
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};
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static void mlxsw_m_module_get_drvinfo(struct net_device *dev,
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struct ethtool_drvinfo *drvinfo)
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{
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struct mlxsw_m_port *mlxsw_m_port = netdev_priv(dev);
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struct mlxsw_m *mlxsw_m = mlxsw_m_port->mlxsw_m;
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strlcpy(drvinfo->driver, mlxsw_m->bus_info->device_kind,
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sizeof(drvinfo->driver));
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snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
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"%d.%d.%d",
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mlxsw_m->bus_info->fw_rev.major,
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mlxsw_m->bus_info->fw_rev.minor,
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mlxsw_m->bus_info->fw_rev.subminor);
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strlcpy(drvinfo->bus_info, mlxsw_m->bus_info->device_name,
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sizeof(drvinfo->bus_info));
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}
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static int mlxsw_m_get_module_info(struct net_device *netdev,
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struct ethtool_modinfo *modinfo)
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{
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struct mlxsw_m_port *mlxsw_m_port = netdev_priv(netdev);
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struct mlxsw_core *core = mlxsw_m_port->mlxsw_m->core;
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return mlxsw_env_get_module_info(core, mlxsw_m_port->module, modinfo);
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}
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static int
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mlxsw_m_get_module_eeprom(struct net_device *netdev, struct ethtool_eeprom *ee,
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u8 *data)
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{
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struct mlxsw_m_port *mlxsw_m_port = netdev_priv(netdev);
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struct mlxsw_core *core = mlxsw_m_port->mlxsw_m->core;
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return mlxsw_env_get_module_eeprom(netdev, core, mlxsw_m_port->module,
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ee, data);
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}
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static const struct ethtool_ops mlxsw_m_port_ethtool_ops = {
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.get_drvinfo = mlxsw_m_module_get_drvinfo,
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.get_module_info = mlxsw_m_get_module_info,
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.get_module_eeprom = mlxsw_m_get_module_eeprom,
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};
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static int
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mlxsw_m_port_module_info_get(struct mlxsw_m *mlxsw_m, u8 local_port,
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u8 *p_module, u8 *p_width)
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{
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char pmlp_pl[MLXSW_REG_PMLP_LEN];
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int err;
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mlxsw_reg_pmlp_pack(pmlp_pl, local_port);
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err = mlxsw_reg_query(mlxsw_m->core, MLXSW_REG(pmlp), pmlp_pl);
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if (err)
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return err;
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*p_module = mlxsw_reg_pmlp_module_get(pmlp_pl, 0);
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*p_width = mlxsw_reg_pmlp_width_get(pmlp_pl);
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return 0;
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}
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static int
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mlxsw_m_port_dev_addr_get(struct mlxsw_m_port *mlxsw_m_port)
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{
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struct mlxsw_m *mlxsw_m = mlxsw_m_port->mlxsw_m;
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struct net_device *dev = mlxsw_m_port->dev;
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char ppad_pl[MLXSW_REG_PPAD_LEN];
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int err;
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mlxsw_reg_ppad_pack(ppad_pl, false, 0);
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err = mlxsw_reg_query(mlxsw_m->core, MLXSW_REG(ppad), ppad_pl);
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if (err)
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return err;
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mlxsw_reg_ppad_mac_memcpy_from(ppad_pl, dev->dev_addr);
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/* The last byte value in base mac address is guaranteed
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* to be such it does not overflow when adding local_port
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* value.
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*/
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dev->dev_addr[ETH_ALEN - 1] += mlxsw_m_port->module + 1;
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return 0;
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}
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static int
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mlxsw_m_port_create(struct mlxsw_m *mlxsw_m, u8 local_port, u8 module)
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{
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struct mlxsw_m_port *mlxsw_m_port;
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struct net_device *dev;
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int err;
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err = mlxsw_core_port_init(mlxsw_m->core, local_port,
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module + 1, false, 0, false,
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0, mlxsw_m->base_mac,
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sizeof(mlxsw_m->base_mac));
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if (err) {
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dev_err(mlxsw_m->bus_info->dev, "Port %d: Failed to init core port\n",
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local_port);
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return err;
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}
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dev = alloc_etherdev(sizeof(struct mlxsw_m_port));
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if (!dev) {
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err = -ENOMEM;
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goto err_alloc_etherdev;
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}
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SET_NETDEV_DEV(dev, mlxsw_m->bus_info->dev);
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dev_net_set(dev, mlxsw_core_net(mlxsw_m->core));
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mlxsw_m_port = netdev_priv(dev);
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mlxsw_m_port->dev = dev;
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mlxsw_m_port->mlxsw_m = mlxsw_m;
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mlxsw_m_port->local_port = local_port;
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mlxsw_m_port->module = module;
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dev->netdev_ops = &mlxsw_m_port_netdev_ops;
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dev->ethtool_ops = &mlxsw_m_port_ethtool_ops;
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err = mlxsw_m_port_dev_addr_get(mlxsw_m_port);
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if (err) {
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dev_err(mlxsw_m->bus_info->dev, "Port %d: Unable to get port mac address\n",
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mlxsw_m_port->local_port);
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goto err_dev_addr_get;
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}
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netif_carrier_off(dev);
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mlxsw_m->ports[local_port] = mlxsw_m_port;
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err = register_netdev(dev);
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if (err) {
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dev_err(mlxsw_m->bus_info->dev, "Port %d: Failed to register netdev\n",
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mlxsw_m_port->local_port);
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goto err_register_netdev;
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}
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mlxsw_core_port_eth_set(mlxsw_m->core, mlxsw_m_port->local_port,
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mlxsw_m_port, dev);
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return 0;
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err_register_netdev:
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mlxsw_m->ports[local_port] = NULL;
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err_dev_addr_get:
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free_netdev(dev);
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err_alloc_etherdev:
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mlxsw_core_port_fini(mlxsw_m->core, local_port);
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return err;
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}
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static void mlxsw_m_port_remove(struct mlxsw_m *mlxsw_m, u8 local_port)
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{
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struct mlxsw_m_port *mlxsw_m_port = mlxsw_m->ports[local_port];
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mlxsw_core_port_clear(mlxsw_m->core, local_port, mlxsw_m);
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unregister_netdev(mlxsw_m_port->dev); /* This calls ndo_stop */
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mlxsw_m->ports[local_port] = NULL;
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free_netdev(mlxsw_m_port->dev);
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mlxsw_core_port_fini(mlxsw_m->core, local_port);
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}
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static int mlxsw_m_port_module_map(struct mlxsw_m *mlxsw_m, u8 local_port,
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u8 *last_module)
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{
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unsigned int max_ports = mlxsw_core_max_ports(mlxsw_m->core);
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u8 module, width;
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int err;
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/* Fill out to local port mapping array */
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err = mlxsw_m_port_module_info_get(mlxsw_m, local_port, &module,
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&width);
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if (err)
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return err;
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if (!width)
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return 0;
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/* Skip, if port belongs to the cluster */
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if (module == *last_module)
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return 0;
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*last_module = module;
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if (WARN_ON_ONCE(module >= max_ports))
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return -EINVAL;
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mlxsw_m->module_to_port[module] = ++mlxsw_m->max_ports;
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return 0;
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}
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static void mlxsw_m_port_module_unmap(struct mlxsw_m *mlxsw_m, u8 module)
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{
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mlxsw_m->module_to_port[module] = -1;
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}
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static int mlxsw_m_ports_create(struct mlxsw_m *mlxsw_m)
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{
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unsigned int max_ports = mlxsw_core_max_ports(mlxsw_m->core);
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u8 last_module = max_ports;
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int i;
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int err;
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mlxsw_m->ports = kcalloc(max_ports, sizeof(*mlxsw_m->ports),
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GFP_KERNEL);
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if (!mlxsw_m->ports)
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return -ENOMEM;
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mlxsw_m->module_to_port = kmalloc_array(max_ports, sizeof(int),
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GFP_KERNEL);
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if (!mlxsw_m->module_to_port) {
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err = -ENOMEM;
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goto err_module_to_port_alloc;
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}
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/* Invalidate the entries of module to local port mapping array */
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for (i = 0; i < max_ports; i++)
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mlxsw_m->module_to_port[i] = -1;
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/* Fill out module to local port mapping array */
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for (i = 1; i < max_ports; i++) {
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err = mlxsw_m_port_module_map(mlxsw_m, i, &last_module);
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if (err)
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goto err_module_to_port_map;
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}
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/* Create port objects for each valid entry */
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for (i = 0; i < mlxsw_m->max_ports; i++) {
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if (mlxsw_m->module_to_port[i] > 0) {
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err = mlxsw_m_port_create(mlxsw_m,
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mlxsw_m->module_to_port[i],
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i);
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if (err)
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goto err_module_to_port_create;
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}
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}
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return 0;
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err_module_to_port_create:
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for (i--; i >= 0; i--) {
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if (mlxsw_m->module_to_port[i] > 0)
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mlxsw_m_port_remove(mlxsw_m,
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mlxsw_m->module_to_port[i]);
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}
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i = max_ports;
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err_module_to_port_map:
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for (i--; i > 0; i--)
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mlxsw_m_port_module_unmap(mlxsw_m, i);
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kfree(mlxsw_m->module_to_port);
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err_module_to_port_alloc:
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kfree(mlxsw_m->ports);
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return err;
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}
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static void mlxsw_m_ports_remove(struct mlxsw_m *mlxsw_m)
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{
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int i;
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for (i = 0; i < mlxsw_m->max_ports; i++) {
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if (mlxsw_m->module_to_port[i] > 0) {
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mlxsw_m_port_remove(mlxsw_m,
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mlxsw_m->module_to_port[i]);
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mlxsw_m_port_module_unmap(mlxsw_m, i);
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}
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}
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kfree(mlxsw_m->module_to_port);
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kfree(mlxsw_m->ports);
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}
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static int mlxsw_m_fw_rev_validate(struct mlxsw_m *mlxsw_m)
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{
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const struct mlxsw_fw_rev *rev = &mlxsw_m->bus_info->fw_rev;
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/* Validate driver and FW are compatible.
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* Do not check major version, since it defines chip type, while
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* driver is supposed to support any type.
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*/
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if (mlxsw_core_fw_rev_minor_subminor_validate(rev, &mlxsw_m_fw_rev))
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return 0;
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dev_err(mlxsw_m->bus_info->dev, "The firmware version %d.%d.%d is incompatible with the driver (required >= %d.%d.%d)\n",
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rev->major, rev->minor, rev->subminor, rev->major,
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mlxsw_m_fw_rev.minor, mlxsw_m_fw_rev.subminor);
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return -EINVAL;
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}
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static int mlxsw_m_init(struct mlxsw_core *mlxsw_core,
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const struct mlxsw_bus_info *mlxsw_bus_info,
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struct netlink_ext_ack *extack)
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{
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struct mlxsw_m *mlxsw_m = mlxsw_core_driver_priv(mlxsw_core);
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int err;
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mlxsw_m->core = mlxsw_core;
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mlxsw_m->bus_info = mlxsw_bus_info;
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err = mlxsw_m_fw_rev_validate(mlxsw_m);
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if (err)
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return err;
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err = mlxsw_m_base_mac_get(mlxsw_m);
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if (err) {
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dev_err(mlxsw_m->bus_info->dev, "Failed to get base mac\n");
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return err;
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}
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err = mlxsw_m_ports_create(mlxsw_m);
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if (err) {
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dev_err(mlxsw_m->bus_info->dev, "Failed to create ports\n");
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return err;
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}
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return 0;
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}
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static void mlxsw_m_fini(struct mlxsw_core *mlxsw_core)
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{
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struct mlxsw_m *mlxsw_m = mlxsw_core_driver_priv(mlxsw_core);
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mlxsw_m_ports_remove(mlxsw_m);
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}
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static const struct mlxsw_config_profile mlxsw_m_config_profile;
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static struct mlxsw_driver mlxsw_m_driver = {
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.kind = mlxsw_m_driver_name,
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.priv_size = sizeof(struct mlxsw_m),
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.init = mlxsw_m_init,
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.fini = mlxsw_m_fini,
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.profile = &mlxsw_m_config_profile,
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.res_query_enabled = true,
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};
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static const struct i2c_device_id mlxsw_m_i2c_id[] = {
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{ "mlxsw_minimal", 0},
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{ },
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};
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static struct i2c_driver mlxsw_m_i2c_driver = {
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.driver.name = "mlxsw_minimal",
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.class = I2C_CLASS_HWMON,
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.id_table = mlxsw_m_i2c_id,
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};
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static int __init mlxsw_m_module_init(void)
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{
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int err;
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err = mlxsw_core_driver_register(&mlxsw_m_driver);
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if (err)
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return err;
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err = mlxsw_i2c_driver_register(&mlxsw_m_i2c_driver);
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if (err)
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goto err_i2c_driver_register;
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return 0;
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err_i2c_driver_register:
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mlxsw_core_driver_unregister(&mlxsw_m_driver);
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return err;
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}
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static void __exit mlxsw_m_module_exit(void)
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{
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mlxsw_i2c_driver_unregister(&mlxsw_m_i2c_driver);
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mlxsw_core_driver_unregister(&mlxsw_m_driver);
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}
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module_init(mlxsw_m_module_init);
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module_exit(mlxsw_m_module_exit);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
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MODULE_DESCRIPTION("Mellanox minimal driver");
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MODULE_DEVICE_TABLE(i2c, mlxsw_m_i2c_id);
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