Add DSA based port multiplexing functionality for barebox. With this framework we will be able to use different ports of as switch separately. Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx> --- drivers/net/Kconfig | 4 + drivers/net/Makefile | 1 + drivers/net/dsa.c | 460 +++++++++++++++++++++++++++++++++++++++++++ include/dsa.h | 90 +++++++++ 4 files changed, 555 insertions(+) create mode 100644 drivers/net/dsa.c create mode 100644 include/dsa.h diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 65c93bbe84..8d76fe66f2 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -17,6 +17,10 @@ config HAS_MACB config PHYLIB bool +config DSA + bool + select PHYLIB + menu "Network drivers" depends on NET diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 40045bab04..406e13f1a0 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_DSA) += dsa.o obj-$(CONFIG_PHYLIB) += phy/ obj-$(CONFIG_NET_USB) += usb/ diff --git a/drivers/net/dsa.c b/drivers/net/dsa.c new file mode 100644 index 0000000000..2a93f0cd9f --- /dev/null +++ b/drivers/net/dsa.c @@ -0,0 +1,460 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <common.h> +#include <dma.h> +#include <dsa.h> +#include <of_net.h> + +u32 dsa_user_ports(struct dsa_switch *ds) +{ + u32 mask = 0; + int i; + + for (i = 0; i < ds->num_ports; i++) { + if (ds->dp[i]) + mask |= BIT(ds->dp[i]->index); + } + + return mask; +} + +static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg) +{ + struct dsa_switch *ds = bus->priv; + + if (ds->phys_mii_mask & BIT(addr)) + return ds->ops->phy_read(ds, addr, reg); + + return 0xffff; +} + +static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val) +{ + struct dsa_switch *ds = bus->priv; + + if (ds->phys_mii_mask & BIT(addr)) + return ds->ops->phy_write(ds, addr, reg, val); + + return 0; +} + +static int dsa_slave_mii_bus_init(struct dsa_switch *ds) +{ + ds->slave_mii_bus = xzalloc(sizeof(*ds->slave_mii_bus)); + ds->slave_mii_bus->priv = (void *)ds; + ds->slave_mii_bus->read = dsa_slave_phy_read; + ds->slave_mii_bus->write = dsa_slave_phy_write; + ds->slave_mii_bus->parent = ds->dev; + ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask; + + return mdiobus_register(ds->slave_mii_bus); +} + +static int dsa_port_probe(struct eth_device *edev) +{ + struct dsa_port *dp = edev->priv; + struct dsa_switch *ds = dp->ds; + const struct dsa_ops *ops = ds->ops; + phy_interface_t interface; + int ret; + + if (ops->port_probe) { + interface = of_get_phy_mode(dp->dev.device_node); + ret = ops->port_probe(dp, dp->index, interface); + if (ret) + return ret; + } + + return 0; +} + +static void dsa_port_set_ethaddr(struct eth_device *edev) +{ + struct dsa_port *dp = edev->priv; + struct dsa_switch *ds = dp->ds; + + if (is_valid_ether_addr(edev->ethaddr)) + return; + + if (!is_valid_ether_addr(ds->edev_master->ethaddr)) + return; + + eth_set_ethaddr(edev, ds->edev_master->ethaddr); +} + +static int dsa_port_start(struct eth_device *edev) +{ + struct dsa_port *dp = edev->priv; + struct dsa_switch *ds = dp->ds; + const struct dsa_ops *ops = ds->ops; + phy_interface_t interface; + int ret; + + if (dp->enabled) + return -EBUSY; + + interface = of_get_phy_mode(dp->dev.device_node); + + if (ops->port_pre_enable) { + /* In case of RMII interface we need to enable RMII clock + * before talking to the PHY. + */ + ret = ops->port_pre_enable(dp, dp->index, interface); + if (ret) + return ret; + } + + ret = phy_device_connect(edev, ds->slave_mii_bus, dp->index, NULL, 0, + interface); + if (ret) + return ret; + + dsa_port_set_ethaddr(edev); + + if (ops->port_enable) { + ret = ops->port_enable(dp, dp->index, dp->edev.phydev); + if (ret) + return ret; + } + + dp->enabled = true; + + if (!ds->cpu_port_users) { + struct dsa_port *dpc = ds->dp[ds->cpu_port]; + + ret = ops->port_enable(dpc, ds->cpu_port, + ds->cpu_port_fixed_phy); + if (ret) + return ret; + eth_open(ds->edev_master); + ds->cpu_port_users++; + } + + return 0; +} + +/* Stop the desired port, the CPU port and the master Eth interface */ +static void dsa_port_stop(struct eth_device *edev) +{ + struct dsa_port *dp = edev->priv; + struct dsa_switch *ds = dp->ds; + const struct dsa_ops *ops = ds->ops; + + if (!dp->enabled) + return; + + if (ops->port_disable) + ops->port_disable(dp, dp->index, dp->edev.phydev); + + dp->enabled = false; + ds->cpu_port_users--; + + if (!ds->cpu_port_users) { + struct dsa_port *dpc = ds->dp[ds->cpu_port]; + + ops->port_disable(dpc, ds->cpu_port, ds->cpu_port_fixed_phy); + eth_close(ds->edev_master); + } +} + +static int dsa_port_send(struct eth_device *edev, void *packet, int length) +{ + struct dsa_port *dp = edev->priv; + struct dsa_switch *ds = dp->ds; + struct eth_device *edev_master; + const struct dsa_ops *ops = ds->ops; + void *tx_buf = ds->tx_buf; + size_t full_length, stuff = 0; + int ret; + + if (length < 64) + stuff = 64 - length; + + full_length = length + ds->needed_headroom + ds->needed_tx_tailroom + + stuff; + + if (full_length > DSA_PKTSIZE) + return -ENOMEM; + + memset(tx_buf + full_length - stuff, 0, stuff); + memcpy(tx_buf + ds->needed_headroom, packet, length); + ret = ops->xmit(dp, dp->index, tx_buf, full_length); + if (ret) + return ret; + + edev_master = ds->edev_master; + + return eth_send_raw(edev_master, tx_buf, full_length); +} + +static int dsa_port_recv(struct eth_device *edev) +{ + struct dsa_port *dp = edev->priv; + int length; + + if (!dp->rx_buf_length) + return 0; + + net_receive(edev, dp->rx_buf, dp->rx_buf_length); + length = dp->rx_buf_length; + dp->rx_buf_length = 0; + + return length; +} + +static int dsa_ether_set_ethaddr(struct eth_device *edev, + const unsigned char *adr) +{ + struct dsa_port *dp = edev->priv; + struct dsa_switch *ds = dp->ds; + struct eth_device *edev_master; + + edev_master = ds->edev_master; + + return edev_master->set_ethaddr(edev_master, adr); +} + +static int dsa_ether_get_ethaddr(struct eth_device *edev, unsigned char *adr) +{ + struct dsa_port *dp = edev->priv; + struct dsa_switch *ds = dp->ds; + struct eth_device *edev_master; + + edev_master = ds->edev_master; + + return edev_master->get_ethaddr(edev_master, adr); +} + +static int dsa_switch_regiser_edev(struct dsa_switch *ds, + struct device_node *dn, int port) +{ + struct eth_device *edev; + struct device_d *dev; + struct dsa_port *dp; + int ret; + + ds->dp[port] = xzalloc(sizeof(*dp)); + + dp = ds->dp[port]; + dev = &dp->dev; + + dev_set_name(dev, "dsa_port"); + dev->id = DEVICE_ID_DYNAMIC; + dev->parent = ds->dev; + dev->device_node = dn; + + ret = register_device(dev); + if (ret) + return ret; + + dp->rx_buf = xmalloc(DSA_PKTSIZE); + dp->ds = ds; + dp->index = port; + + edev = &dp->edev; + edev->priv = dp; + edev->parent = dev; + edev->init = dsa_port_probe; + edev->open = dsa_port_start; + edev->send = dsa_port_send; + edev->recv = dsa_port_recv; + edev->halt = dsa_port_stop; + edev->get_ethaddr = dsa_ether_get_ethaddr; + edev->set_ethaddr = dsa_ether_set_ethaddr; + + return eth_register(edev); +} + +static int dsa_rx_preprocessor(struct eth_device *edev, unsigned char **packet, + int *length) +{ + struct dsa_switch *ds = edev->rx_preprocessor_priv; + const struct dsa_ops *ops = ds->ops; + struct dsa_port *dp; + int ret, port; + + ret = ops->rcv(ds, &port, *packet, *length); + if (ret) + return ret; + + *length -= ds->needed_headroom; + *packet += ds->needed_headroom; + *length -= ds->needed_rx_tailroom; + + if (port > DSA_MAX_PORTS) + return -ERANGE; + + dp = ds->dp[port]; + if (!dp) + return 0; + + if (*length > DSA_PKTSIZE) + return -ENOMEM; + + if (dp->rx_buf_length) + return -EIO; + + memcpy(dp->rx_buf, *packet, *length); + dp->rx_buf_length = *length; + + return -ENOMSG; +} + +static int dsa_switch_regiser_master(struct dsa_switch *ds, + struct device_node *np, + struct device_node *master, int port) +{ + struct device_node *phy_node; + struct phy_device *phydev; + struct dsa_port *dp; + int ret; + + of_device_ensure_probed(master); + + if (ds->edev_master) { + dev_err(ds->dev, "master was already registered!\n"); + return -EINVAL; + } + + ds->edev_master = of_find_eth_device_by_node(master); + if (!ds->edev_master) { + dev_err(ds->dev, "can't find ethernet master device\n"); + return -ENODEV; + } + + ds->edev_master->rx_preprocessor = dsa_rx_preprocessor; + ds->edev_master->rx_preprocessor_priv = ds; + + ret = dev_set_param(&ds->edev_master->dev, "mode", "disabled"); + if (ret) + dev_warn(ds->dev, "Can't set disable master Ethernet device\n"); + + phydev = phy_device_create(NULL, 0, 0); + + phydev->registered = 1; + phydev->link = 1; + + phy_node = of_get_child_by_name(np, "fixed-link"); + if (!phy_node) + return -ENODEV; + + if (of_property_read_u32(phy_node, "speed", &phydev->speed)) + return -ENODEV; + + phydev->duplex = of_property_read_bool(phy_node, "full-duplex"); + phydev->pause = of_property_read_bool(phy_node, "pause"); + phydev->asym_pause = of_property_read_bool(phy_node, "asym-pause"); + phydev->interface = of_get_phy_mode(np); + + ds->dp[port] = xzalloc(sizeof(*dp)); + dp = ds->dp[port]; + dp->ds = ds; + + ds->cpu_port = port; + ds->cpu_port_fixed_phy = phydev; + + return 0; +} + +static int dsa_switch_parse_ports_of(struct dsa_switch *ds, + struct device_node *dn) +{ + struct device_node *ports, *port; + int ret = 0; + u32 reg; + + ports = of_get_child_by_name(dn, "ports"); + if (!ports) { + /* The second possibility is "ethernet-ports" */ + ports = of_get_child_by_name(dn, "ethernet-ports"); + if (!ports) { + dev_err(ds->dev, "no ports child node found\n"); + return -EINVAL; + } + } + + for_each_available_child_of_node(ports, port) { + struct device_node *master; + + ret = of_property_read_u32(port, "reg", ®); + if (ret) { + dev_err(ds->dev, "No or too many ports are configured\n"); + goto out_put_node; + } + + if (reg >= ds->num_ports) { + dev_err(ds->dev, "port %pOF index %u exceeds num_ports (%u)\n", + port, reg, ds->num_ports); + ret = -EINVAL; + goto out_put_node; + } + + master = of_parse_phandle(port, "ethernet", 0); + if (master) + dsa_switch_regiser_master(ds, port, master, reg); + } + + for_each_available_child_of_node(ports, port) { + struct device_node *master; + + ret = of_property_read_u32(port, "reg", ®); + if (ret) { + dev_err(ds->dev, "No or too many ports are configured\n"); + goto out_put_node; + } + + if (reg >= ds->num_ports) { + dev_err(ds->dev, "port %pOF index %u exceeds num_ports (%u)\n", + port, reg, ds->num_ports); + ret = -EINVAL; + goto out_put_node; + } + + master = of_parse_phandle(port, "ethernet", 0); + if (!master) { + ret = dsa_switch_regiser_edev(ds, port, reg); + if (ret) { + dev_err(ds->dev, "Can't create edev for port %i\n", + reg); + return ret; + } + } + } + +out_put_node: + return ret; +} + +int dsa_register_switch(struct dsa_switch *ds) +{ + struct device_node *dn; + int ret; + + if (!ds->dev) { + pr_err("No dev is set\n"); + return -ENODEV; + } + + ds->tx_buf = dma_alloc(DSA_PKTSIZE); + dn = ds->dev->device_node; + + if (!ds->num_ports || ds->num_ports > DSA_MAX_PORTS) { + dev_err(ds->dev, "No or too many ports are configured\n"); + return -EINVAL; + } + + if (dn) + ret = dsa_switch_parse_ports_of(ds, dn); + else + ret = -ENODEV; + + if (ret) + return ret; + + if (!ds->slave_mii_bus && ds->ops->phy_read) + ret = dsa_slave_mii_bus_init(ds); + + return ret; +} +EXPORT_SYMBOL_GPL(dsa_register_switch); + diff --git a/include/dsa.h b/include/dsa.h new file mode 100644 index 0000000000..75a939f2cb --- /dev/null +++ b/include/dsa.h @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright 2019-2021 NXP + */ + +#ifndef __DSA_H__ +#define __DSA_H__ + +#include <linux/phy.h> +#include <net.h> + +/** + * DSA stands for Distributed Switch Architecture and it is infrastructure + * intended to support drivers for Switches that rely on an intermediary + * Ethernet device for I/O. These switches may support cascading allowing + * them to be arranged as a tree. + * DSA is documented in detail in the Linux kernel documentation under + * Documentation/networking/dsa/dsa.txt + * The network layout of such a switch is shown below: + * + * |------| + * | eth0 | <--- master eth device (regular eth driver) + * |------| + * ^ | + * tag added by switch -->| | + * | | + * | |<-- tag added by DSA driver + * | v + * |--------------------------------------| + * | | CPU port | | <-- DSA (switch) device + * | ------------ | (DSA driver) + * | _________ _________ _________ | + * | | port0 | | port1 | ... | portn | | <-- ports as eth devices + * |-+-------+--+-------+-------+-------+-| ('dsa-port' eth driver) + * + */ + +#define DSA_MAX_PORTS 12 +#define DSA_PKTSIZE 1538 + +struct dsa_port; +struct dsa_switch; + +struct dsa_ops { + int (*port_probe)(struct dsa_port *dp, int port, + phy_interface_t phy_mode); + int (*port_pre_enable)(struct dsa_port *dp, int port, + phy_interface_t phy_mode); + int (*port_enable)(struct dsa_port *dp, int port, + struct phy_device *phy); + void (*port_disable)(struct dsa_port *dp, int port, + struct phy_device *phy); + int (*xmit)(struct dsa_port *dp, int port, void *packet, int length); + int (*rcv)(struct dsa_switch *ds, int *portp, void *packet, int length); + + int (*phy_read)(struct dsa_switch *ds, int port, int regnum); + int (*phy_write)(struct dsa_switch *ds, int port, int regnum, u16 val); +}; + +struct dsa_port { + struct device_d dev; + struct dsa_switch *ds; + unsigned int index; + struct eth_device edev; + unsigned char *rx_buf; + size_t rx_buf_length; + bool enabled; +}; + +struct dsa_switch { + struct device_d *dev; + const struct dsa_ops *ops; + size_t num_ports; + u32 cpu_port; + int cpu_port_users; + struct eth_device *edev_master; + struct phy_device *cpu_port_fixed_phy; + struct dsa_port *dp[DSA_MAX_PORTS]; + size_t needed_headroom; + size_t needed_rx_tailroom; + size_t needed_tx_tailroom; + void *tx_buf; + struct mii_bus *slave_mii_bus; + u32 phys_mii_mask; +}; + +int dsa_register_switch(struct dsa_switch *ds); +u32 dsa_user_ports(struct dsa_switch *ds); + +#endif /* __DSA_H__ */ -- 2.30.2 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox