[RFC PATCH v6 2/2] net: ti: icssg-prueth: Add ICSSG ethernet driver
Simon Horman
simon.horman at corigine.com
Wed Apr 26 12:09:34 PDT 2023
On Mon, Apr 24, 2023 at 11:02:33AM +0530, MD Danish Anwar wrote:
> From: Roger Quadros <rogerq at ti.com>
>
> This is the Ethernet driver for TI AM654 Silicon rev. 2
> with the ICSSG PRU Sub-system running dual-EMAC firmware.
>
> The Programmable Real-time Unit and Industrial Communication Subsystem
> Gigabit (PRU_ICSSG) is a low-latency microcontroller subsystem in the TI
> SoCs. This subsystem is provided for the use cases like implementation of
> custom peripheral interfaces, offloading of tasks from the other
> processor cores of the SoC, etc.
>
> Every ICSSG core has two Programmable Real-Time Unit(PRUs),
> two auxiliary Real-Time Transfer Unit (RT_PRUs), and
> two Transmit Real-Time Transfer Units (TX_PRUs). Each one of these runs
> its own firmware. Every ICSSG core has two MII ports connect to these
> PRUs and also a MDIO port.
>
> The cores can run different firmwares to support different protocols and
> features like switch-dev, timestamping, etc.
>
> It uses System DMA to transfer and receive packets and
> shared memory register emulation between the firmware and
> driver for control and configuration.
>
> This patch adds support for basic EMAC functionality with 1Gbps
> and 100Mbps link speed. 10M and half duplex mode are not supported
> currently as they require IEP, the support for which will be added later.
> Support for switch-dev, timestamp, etc. will be added later
> by subsequent patch series.
>
> Signed-off-by: Roger Quadros <rogerq at ti.com>
> [Vignesh Raghavendra: add 10M full duplex support]
> Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
> [Grygorii Strashko: add support for half duplex operation]
> Signed-off-by: Grygorii Strashko <grygorii.strashko at ti.com>
> Signed-off-by: Puranjay Mohan <p-mohan at ti.com>
> Signed-off-by: MD Danish Anwar <danishanwar at ti.com>
> Reviewed-by: Andrew Lunn <andrew at lunn.ch>
Hi MD,
Thanks for your patch, some review from my side.
...
> index 000000000000..27bd92ea8200
> --- /dev/null
> +++ b/drivers/net/ethernet/ti/icssg_config.c
...
> +static void icssg_config_mii_init(struct prueth_emac *emac)
> +{
> + struct prueth *prueth = emac->prueth;
> + struct regmap *mii_rt = prueth->mii_rt;
> + int slice = prueth_emac_slice(emac);
I think you need to check the return value of prueth_emac_slice for errors.
Or can that never happen?
> + u32 rxcfg_reg, txcfg_reg, pcnt_reg;
> + u32 rxcfg, txcfg;
For networking code, please arrange local variables in reverse xmas tree
order - longest line to shortest. In this case I think that would mean
something like:
u32 rxcfg, txcfg, rxcfg_reg, txcfg_reg, pcnt_reg;
struct prueth *prueth = emac->prueth;
int slice = prueth_emac_slice(emac);
struct regmap *mii_rt;
mii_rt = prueth->mii_rt;
You can check this using https://github.com/ecree-solarflare/xmastree
> +
> + rxcfg_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_RXCFG0 :
> + PRUSS_MII_RT_RXCFG1;
> + txcfg_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_TXCFG0 :
> + PRUSS_MII_RT_TXCFG1;
> + pcnt_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_RX_PCNT0 :
> + PRUSS_MII_RT_RX_PCNT1;
> +
> + rxcfg = MII_RXCFG_DEFAULT;
> + txcfg = MII_TXCFG_DEFAULT;
> +
> + if (slice == ICSS_MII1)
> + rxcfg |= PRUSS_MII_RT_RXCFG_RX_MUX_SEL;
> +
> + /* In MII mode TX lines swapped inside ICSSG, so TX_MUX_SEL cfg need
> + * to be swapped also comparing to RGMII mode.
> + */
> + if (emac->phy_if == PHY_INTERFACE_MODE_MII && slice == ICSS_MII0)
> + txcfg |= PRUSS_MII_RT_TXCFG_TX_MUX_SEL;
> + else if (emac->phy_if != PHY_INTERFACE_MODE_MII && slice == ICSS_MII1)
> + txcfg |= PRUSS_MII_RT_TXCFG_TX_MUX_SEL;
> +
> + regmap_write(mii_rt, rxcfg_reg, rxcfg);
> + regmap_write(mii_rt, txcfg_reg, txcfg);
> + regmap_write(mii_rt, pcnt_reg, 0x1);
> +}
> +
> +static void icssg_miig_queues_init(struct prueth *prueth, int slice)
> +{
> + struct regmap *miig_rt = prueth->miig_rt;
> + void __iomem *smem = prueth->shram.va;
> + u8 pd[ICSSG_SPECIAL_PD_SIZE];
> + int queue = 0, i, j;
> + u32 *pdword;
> +
> + /* reset hwqueues */
> + if (slice)
> + queue = ICSSG_NUM_TX_QUEUES;
> +
> + for (i = 0; i < ICSSG_NUM_TX_QUEUES; i++) {
> + regmap_write(miig_rt, ICSSG_QUEUE_RESET_OFFSET, queue);
> + queue++;
> + }
> +
> + queue = slice ? RECYCLE_Q_SLICE1 : RECYCLE_Q_SLICE0;
> + regmap_write(miig_rt, ICSSG_QUEUE_RESET_OFFSET, queue);
> +
> + for (i = 0; i < ICSSG_NUM_OTHER_QUEUES; i++) {
> + regmap_write(miig_rt, ICSSG_QUEUE_RESET_OFFSET,
> + hwq_map[slice][i].queue);
> + }
> +
> + /* initialize packet descriptors in SMEM */
> + /* push pakcet descriptors to hwqueues */
> +
> + pdword = (u32 *)pd;
> + for (j = 0; j < ICSSG_NUM_OTHER_QUEUES; j++) {
> + struct map *mp;
> + int pd_size, num_pds;
> + u32 pdaddr;
> +
> + mp = &hwq_map[slice][j];
hwq_map is const, but mq is not.
clang-16 with W=1 tells me:
drivers/net/ethernet/ti/icssg_config.c:176:6: error: assigning to 'struct map *' from 'const struct map *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
mp = &hwq_map[slice][j];
> + if (mp->special) {
> + pd_size = ICSSG_SPECIAL_PD_SIZE;
> + num_pds = ICSSG_NUM_SPECIAL_PDS;
> + } else {
> + pd_size = ICSSG_NORMAL_PD_SIZE;
> + num_pds = ICSSG_NUM_NORMAL_PDS;
> + }
> +
> + for (i = 0; i < num_pds; i++) {
> + memset(pd, 0, pd_size);
> +
> + pdword[0] &= cpu_to_le32(ICSSG_FLAG_MASK);
> + pdword[0] |= cpu_to_le32(mp->flags);
> + pdaddr = mp->pd_addr_start + i * pd_size;
> +
> + memcpy_toio(smem + pdaddr, pd, pd_size);
> + queue = mp->queue;
> + regmap_write(miig_rt, ICSSG_QUEUE_OFFSET + 4 * queue,
> + pdaddr);
> + }
> + }
> +}
> +
> +void icssg_config_ipg(struct prueth_emac *emac)
> +{
> + struct prueth *prueth = emac->prueth;
> + int slice = prueth_emac_slice(emac);
> +
> + switch (emac->speed) {
> + case SPEED_1000:
> + icssg_mii_update_ipg(prueth->mii_rt, slice, MII_RT_TX_IPG_1G);
> + break;
> + case SPEED_100:
> + icssg_mii_update_ipg(prueth->mii_rt, slice, MII_RT_TX_IPG_100M);
> + break;
> + default:
> + /* Other links speeds not supported */
> + netdev_err(emac->ndev, "Unsupported link speed\n");
> + return;
Should this propagate an error to the caller?
> + }
> +}
...
> +static int prueth_emac_buffer_setup(struct prueth_emac *emac)
> +{
> + struct icssg_buffer_pool_cfg *bpool_cfg;
> + struct prueth *prueth = emac->prueth;
> + int slice = prueth_emac_slice(emac);
> + struct icssg_rxq_ctx *rxq_ctx;
> + u32 addr;
> + int i;
> +
> + /* Layout to have 64KB aligned buffer pool
> + * |BPOOL0|BPOOL1|RX_CTX0|RX_CTX1|
> + */
> +
> + addr = lower_32_bits(prueth->msmcram.pa);
> + if (slice)
> + addr += PRUETH_NUM_BUF_POOLS * PRUETH_EMAC_BUF_POOL_SIZE;
> +
> + if (addr % SZ_64K) {
> + dev_warn(prueth->dev, "buffer pool needs to be 64KB aligned\n");
> + return -EINVAL;
> + }
> +
> + bpool_cfg = emac->dram.va + BUFFER_POOL_0_ADDR_OFFSET;
> + /* workaround for f/w bug. bpool 0 needs to be initilalized */
> + bpool_cfg[0].addr = cpu_to_le32(addr);
> + bpool_cfg[0].len = 0;
> +
> + for (i = PRUETH_EMAC_BUF_POOL_START;
> + i < (PRUETH_EMAC_BUF_POOL_START + PRUETH_NUM_BUF_POOLS);
nit: unnecessary parentheses
> + i++) {
> + bpool_cfg[i].addr = cpu_to_le32(addr);
> + bpool_cfg[i].len = cpu_to_le32(PRUETH_EMAC_BUF_POOL_SIZE);
> + addr += PRUETH_EMAC_BUF_POOL_SIZE;
> + }
> +
> + if (!slice)
> + addr += PRUETH_NUM_BUF_POOLS * PRUETH_EMAC_BUF_POOL_SIZE;
> + else
> + addr += PRUETH_EMAC_RX_CTX_BUF_SIZE * 2;
> +
> + /* Pre-emptible RX buffer queue */
> + rxq_ctx = emac->dram.va + HOST_RX_Q_PRE_CONTEXT_OFFSET;
> + for (i = 0; i < 3; i++)
> + rxq_ctx->start[i] = cpu_to_le32(addr);
> +
> + addr += PRUETH_EMAC_RX_CTX_BUF_SIZE;
> + rxq_ctx->end = cpu_to_le32(addr);
> +
> + /* Express RX buffer queue */
> + rxq_ctx = emac->dram.va + HOST_RX_Q_EXP_CONTEXT_OFFSET;
> + for (i = 0; i < 3; i++)
> + rxq_ctx->start[i] = cpu_to_le32(addr);
> +
> + addr += PRUETH_EMAC_RX_CTX_BUF_SIZE;
> + rxq_ctx->end = cpu_to_le32(addr);
> +
> + return 0;
> +}
...
> +void icssg_config_set_speed(struct prueth_emac *emac)
> +{
> + u8 fw_speed;
> +
> + switch (emac->speed) {
> + case SPEED_1000:
> + fw_speed = FW_LINK_SPEED_1G;
> + break;
> + case SPEED_100:
> + fw_speed = FW_LINK_SPEED_100M;
> + break;
> + default:
> + /* Other links speeds not supported */
> + netdev_err(emac->ndev, "Unsupported link speed\n");
> + return;
Should this propagate an error to the caller?
> + }
> +
> + writeb(fw_speed, emac->dram.va + PORT_LINK_SPEED_OFFSET);
> +}
...
> diff --git a/drivers/net/ethernet/ti/icssg_prueth.c b/drivers/net/ethernet/ti/icssg_prueth.c
...
> +static int prueth_init_rx_chns(struct prueth_emac *emac,
> + struct prueth_rx_chn *rx_chn,
> + char *name, u32 max_rflows,
> + u32 max_desc_num)
> +{
> + struct net_device *ndev = emac->ndev;
> + struct device *dev = emac->prueth->dev;
> + struct k3_udma_glue_rx_channel_cfg rx_cfg;
> + u32 fdqring_id;
> + u32 hdesc_size;
> + int i, ret = 0, slice;
> +
> + slice = prueth_emac_slice(emac);
> + if (slice < 0)
> + return slice;
> +
> + /* To differentiate channels for SLICE0 vs SLICE1 */
> + snprintf(rx_chn->name, sizeof(rx_chn->name), "%s%d", name, slice);
> +
> + hdesc_size = cppi5_hdesc_calc_size(true, PRUETH_NAV_PS_DATA_SIZE,
> + PRUETH_NAV_SW_DATA_SIZE);
> + memset(&rx_cfg, 0, sizeof(rx_cfg));
> + rx_cfg.swdata_size = PRUETH_NAV_SW_DATA_SIZE;
> + rx_cfg.flow_id_num = max_rflows;
> + rx_cfg.flow_id_base = -1; /* udmax will auto select flow id base */
> +
> + /* init all flows */
> + rx_chn->dev = dev;
> + rx_chn->descs_num = max_desc_num;
> +
> + rx_chn->rx_chn = k3_udma_glue_request_rx_chn(dev, rx_chn->name,
> + &rx_cfg);
> + if (IS_ERR(rx_chn->rx_chn)) {
> + ret = PTR_ERR(rx_chn->rx_chn);
> + rx_chn->rx_chn = NULL;
> + netdev_err(ndev, "Failed to request rx dma ch: %d\n", ret);
> + goto fail;
> + }
> +
> + rx_chn->dma_dev = k3_udma_glue_rx_get_dma_device(rx_chn->rx_chn);
> + rx_chn->desc_pool = k3_cppi_desc_pool_create_name(rx_chn->dma_dev,
> + rx_chn->descs_num,
> + hdesc_size,
> + rx_chn->name);
> + if (IS_ERR(rx_chn->desc_pool)) {
> + ret = PTR_ERR(rx_chn->desc_pool);
> + rx_chn->desc_pool = NULL;
> + netdev_err(ndev, "Failed to create rx pool: %d\n", ret);
> + goto fail;
> + }
> +
> + emac->rx_flow_id_base = k3_udma_glue_rx_get_flow_id_base(rx_chn->rx_chn);
> + netdev_dbg(ndev, "flow id base = %d\n", emac->rx_flow_id_base);
> +
> + fdqring_id = K3_RINGACC_RING_ID_ANY;
> + for (i = 0; i < rx_cfg.flow_id_num; i++) {
> + struct k3_ring_cfg rxring_cfg = {
> + .elm_size = K3_RINGACC_RING_ELSIZE_8,
> + .mode = K3_RINGACC_RING_MODE_RING,
> + .flags = 0,
> + };
> + struct k3_ring_cfg fdqring_cfg = {
> + .elm_size = K3_RINGACC_RING_ELSIZE_8,
> + .flags = K3_RINGACC_RING_SHARED,
> + };
> + struct k3_udma_glue_rx_flow_cfg rx_flow_cfg = {
> + .rx_cfg = rxring_cfg,
> + .rxfdq_cfg = fdqring_cfg,
> + .ring_rxq_id = K3_RINGACC_RING_ID_ANY,
> + .src_tag_lo_sel =
> + K3_UDMA_GLUE_SRC_TAG_LO_USE_REMOTE_SRC_TAG,
> + };
> +
> + rx_flow_cfg.ring_rxfdq0_id = fdqring_id;
> + rx_flow_cfg.rx_cfg.size = max_desc_num;
> + rx_flow_cfg.rxfdq_cfg.size = max_desc_num;
> + rx_flow_cfg.rxfdq_cfg.mode = emac->prueth->pdata.fdqring_mode;
> +
> + ret = k3_udma_glue_rx_flow_init(rx_chn->rx_chn,
> + i, &rx_flow_cfg);
> + if (ret) {
> + netdev_err(ndev, "Failed to init rx flow%d %d\n",
> + i, ret);
> + goto fail;
> + }
> + if (!i)
> + fdqring_id = k3_udma_glue_rx_flow_get_fdq_id(rx_chn->rx_chn,
> + i);
> + rx_chn->irq[i] = k3_udma_glue_rx_get_irq(rx_chn->rx_chn, i);
> + if (rx_chn->irq[i] <= 0) {
I think ret needs to be set to an error value here here.
> + netdev_err(ndev, "Failed to get rx dma irq");
> + goto fail;
> + }
> + }
> +
> + return 0;
> +
> +fail:
> + prueth_cleanup_rx_chns(emac, rx_chn, max_rflows);
> + return ret;
> +}
...
> +static void prueth_emac_stop(struct prueth_emac *emac)
> +{
> + struct prueth *prueth = emac->prueth;
> + int slice;
> +
> + switch (emac->port_id) {
> + case PRUETH_PORT_MII0:
> + slice = ICSS_SLICE0;
> + break;
> + case PRUETH_PORT_MII1:
> + slice = ICSS_SLICE1;
> + break;
> + default:
> + netdev_err(emac->ndev, "invalid port\n");
> + return;
> + }
> +
> + emac->fw_running = 0;
fw_running won't be cleared if port_id is unknon. Is that ok?
Also, it's not obvious to me that fw_running used for anything.
> + rproc_shutdown(prueth->txpru[slice]);
> + rproc_shutdown(prueth->rtu[slice]);
> + rproc_shutdown(prueth->pru[slice]);
> +}
...
> +static int prueth_netdev_init(struct prueth *prueth,
> + struct device_node *eth_node)
> +{
> + int ret, num_tx_chn = PRUETH_MAX_TX_QUEUES;
> + struct prueth_emac *emac;
> + struct net_device *ndev;
> + enum prueth_port port;
> + enum prueth_mac mac;
> +
> + port = prueth_node_port(eth_node);
> + if (port < 0)
> + return -EINVAL;
> +
> + mac = prueth_node_mac(eth_node);
> + if (mac < 0)
> + return -EINVAL;
> +
> + ndev = alloc_etherdev_mq(sizeof(*emac), num_tx_chn);
> + if (!ndev)
> + return -ENOMEM;
> +
> + emac = netdev_priv(ndev);
> + prueth->emac[mac] = emac;
> + emac->prueth = prueth;
> + emac->ndev = ndev;
> + emac->port_id = port;
> + emac->cmd_wq = create_singlethread_workqueue("icssg_cmd_wq");
> + if (!emac->cmd_wq) {
> + ret = -ENOMEM;
> + goto free_ndev;
> + }
> + INIT_WORK(&emac->rx_mode_work, emac_ndo_set_rx_mode_work);
> +
> + ret = pruss_request_mem_region(prueth->pruss,
> + port == PRUETH_PORT_MII0 ?
> + PRUSS_MEM_DRAM0 : PRUSS_MEM_DRAM1,
> + &emac->dram);
> + if (ret) {
> + dev_err(prueth->dev, "unable to get DRAM: %d\n", ret);
> + ret = -ENOMEM;
> + goto free_wq;
> + }
> +
> + emac->tx_ch_num = 1;
> +
> + SET_NETDEV_DEV(ndev, prueth->dev);
> + spin_lock_init(&emac->lock);
> + mutex_init(&emac->cmd_lock);
> +
> + emac->phy_node = of_parse_phandle(eth_node, "phy-handle", 0);
> + if (!emac->phy_node && !of_phy_is_fixed_link(eth_node)) {
> + dev_err(prueth->dev, "couldn't find phy-handle\n");
> + ret = -ENODEV;
> + goto free;
> + } else if (of_phy_is_fixed_link(eth_node)) {
> + ret = of_phy_register_fixed_link(eth_node);
> + if (ret) {
> + ret = dev_err_probe(prueth->dev, ret,
> + "failed to register fixed-link phy\n");
> + goto free;
> + }
> +
> + emac->phy_node = eth_node;
> + }
> +
> + ret = of_get_phy_mode(eth_node, &emac->phy_if);
> + if (ret) {
> + dev_err(prueth->dev, "could not get phy-mode property\n");
> + goto free;
> + }
> +
> + if (emac->phy_if != PHY_INTERFACE_MODE_MII &&
> + !phy_interface_mode_is_rgmii(emac->phy_if)) {
I think ret needs to be set to an error value here.
> + dev_err(prueth->dev, "PHY mode unsupported %s\n", phy_modes(emac->phy_if));
> + goto free;
> + }
> +
> + /* AM65 SR2.0 has TX Internal delay always enabled by hardware
> + * and it is not possible to disable TX Internal delay. The below
> + * switch case block describes how we handle different phy modes
> + * based on hardware restriction.
> + */
> + switch (emac->phy_if) {
> + case PHY_INTERFACE_MODE_RGMII_ID:
> + emac->phy_if = PHY_INTERFACE_MODE_RGMII_RXID;
> + break;
> + case PHY_INTERFACE_MODE_RGMII_TXID:
> + emac->phy_if = PHY_INTERFACE_MODE_RGMII;
> + break;
> + case PHY_INTERFACE_MODE_RGMII:
> + case PHY_INTERFACE_MODE_RGMII_RXID:
> + dev_err(prueth->dev, "RGMII mode without TX delay is not supported");
> + return -EINVAL;
> + default:
Shoud this be an error condition?
> + break;
> + }
> +
> + /* get mac address from DT and set private and netdev addr */
> + ret = of_get_ethdev_address(eth_node, ndev);
> + if (!is_valid_ether_addr(ndev->dev_addr)) {
> + eth_hw_addr_random(ndev);
> + dev_warn(prueth->dev, "port %d: using random MAC addr: %pM\n",
> + port, ndev->dev_addr);
> + }
> + ether_addr_copy(emac->mac_addr, ndev->dev_addr);
> +
> + ndev->netdev_ops = &emac_netdev_ops;
> + ndev->ethtool_ops = &icssg_ethtool_ops;
> + ndev->hw_features = NETIF_F_SG;
> + ndev->features = ndev->hw_features;
> +
> + netif_napi_add(ndev, &emac->napi_rx,
> + emac_napi_rx_poll);
> +
> + return 0;
> +
> +free:
> + pruss_release_mem_region(prueth->pruss, &emac->dram);
> +free_wq:
> + destroy_workqueue(emac->cmd_wq);
> +free_ndev:
> + free_netdev(ndev);
> + prueth->emac[mac] = NULL;
> +
> + return ret;
> +}
...
> +static int prueth_probe(struct platform_device *pdev)
> +{
> + struct prueth *prueth;
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *eth_ports_node;
> + struct device_node *eth_node;
> + struct device_node *eth0_node, *eth1_node;
> + const struct of_device_id *match;
> + struct pruss *pruss;
> + int i, ret;
> + u32 msmc_ram_size;
> + struct genpool_data_align gp_data = {
> + .align = SZ_64K,
> + };
> +
> + match = of_match_device(prueth_dt_match, dev);
> + if (!match)
> + return -ENODEV;
> +
> + prueth = devm_kzalloc(dev, sizeof(*prueth), GFP_KERNEL);
> + if (!prueth)
> + return -ENOMEM;
> +
> + dev_set_drvdata(dev, prueth);
> + prueth->pdev = pdev;
> + prueth->pdata = *(const struct prueth_pdata *)match->data;
> +
> + prueth->dev = dev;
> + eth_ports_node = of_get_child_by_name(np, "ethernet-ports");
> + if (!eth_ports_node)
> + return -ENOENT;
> +
> + for_each_child_of_node(eth_ports_node, eth_node) {
> + u32 reg;
> +
> + if (strcmp(eth_node->name, "port"))
> + continue;
> + ret = of_property_read_u32(eth_node, "reg", ®);
> + if (ret < 0) {
> + dev_err(dev, "%pOF error reading port_id %d\n",
> + eth_node, ret);
> + }
> +
> + of_node_get(eth_node);
> +
> + if (reg == 0)
> + eth0_node = eth_node;
> + else if (reg == 1)
> + eth1_node = eth_node;
> + else
> + dev_err(dev, "port reg should be 0 or 1\n");
> + }
> +
> + of_node_put(eth_ports_node);
> +
> + /* At least one node must be present and available else we fail */
> + if (!eth0_node && !eth1_node) {
Are eth0_node and eth1_node always initialised in the loop above?
> + dev_err(dev, "neither port0 nor port1 node available\n");
> + return -ENODEV;
> + }
> +
> + if (eth0_node == eth1_node) {
> + dev_err(dev, "port0 and port1 can't have same reg\n");
> + of_node_put(eth0_node);
> + return -ENODEV;
> + }
...
> +MODULE_AUTHOR("Roger Quadros <rogerq at ti.com>");
> +MODULE_AUTHOR("Puranjay Mohan <p-mohan at ti.com>");
> +MODULE_AUTHOR("Md Danish Anwar <danishanwar at ti.com>");
> +MODULE_DESCRIPTION("PRUSS ICSSG Ethernet Driver");
> +MODULE_LICENSE("GPL");
SPDK says GPL-2.0, so perhaps this should be "GPL v2" ?
> diff --git a/drivers/net/ethernet/ti/icssg_prueth.h b/drivers/net/ethernet/ti/icssg_prueth.h
...
> +/**
> + * struct prueth - PRUeth platform data
nit: s/prueth/prueth_pdata/
> + * @fdqring_mode: Free desc queue mode
> + * @quirk_10m_link_issue: 10M link detect errata
> + */
> +struct prueth_pdata {
> + enum k3_ring_mode fdqring_mode;
> + u32 quirk_10m_link_issue:1;
> +};
> +
> +/**
> + * struct prueth - PRUeth structure
> + * @dev: device
> + * @pruss: pruss handle
> + * @pru: rproc instances of PRUs
> + * @rtu: rproc instances of RTUs
> + * @rtu: rproc instances of TX_PRUs
nit: txpru is missing here.
> + * @shram: PRUSS shared RAM region
> + * @sram_pool: MSMC RAM pool for buffers
> + * @msmcram: MSMC RAM region
> + * @eth_node: DT node for the port
> + * @emac: private EMAC data structure
> + * @registered_netdevs: list of registered netdevs
> + * @fw_data: firmware names to be used with PRU remoteprocs
> + * @config: firmware load time configuration per slice
> + * @miig_rt: regmap to mii_g_rt block
nit: mii_rt is missing here.
> + * @pa_stats: regmap to pa_stats block
> + * @pru_id: ID for each of the PRUs
> + * @pdev: pointer to ICSSG platform device
> + * @pdata: pointer to platform data for ICSSG driver
> + * @icssg_hwcmdseq: seq counter or HWQ messages
> + * @emacs_initialized: num of EMACs/ext ports that are up/running
> + */
> +struct prueth {
> + struct device *dev;
> + struct pruss *pruss;
> + struct rproc *pru[PRUSS_NUM_PRUS];
> + struct rproc *rtu[PRUSS_NUM_PRUS];
> + struct rproc *txpru[PRUSS_NUM_PRUS];
> + struct pruss_mem_region shram;
> + struct gen_pool *sram_pool;
> + struct pruss_mem_region msmcram;
> +
> + struct device_node *eth_node[PRUETH_NUM_MACS];
> + struct prueth_emac *emac[PRUETH_NUM_MACS];
> + struct net_device *registered_netdevs[PRUETH_NUM_MACS];
> + const struct prueth_private_data *fw_data;
> + struct regmap *miig_rt;
> + struct regmap *mii_rt;
> + struct regmap *pa_stats;
> +
> + enum pruss_pru_id pru_id[PRUSS_NUM_PRUS];
> + struct platform_device *pdev;
> + struct prueth_pdata pdata;
> + u8 icssg_hwcmdseq;
> +
> + int emacs_initialized;
> +};
...
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