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Date: Wed, 6 Apr 2022 16:13:32 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Puranjay Mohan <p-mohan@...com>
Cc: linux-kernel@...r.kernel.org, bjorn.andersson@...aro.org,
mathieu.poirier@...aro.org, krzysztof.kozlowski+dt@...aro.org,
linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
nm@...com, ssantosh@...nel.org, s-anna@...com,
linux-arm-kernel@...ts.infradead.org, davem@...emloft.net,
kuba@...nel.org, netdev@...r.kernel.org, vigneshr@...com,
kishon@...com
Subject: Re: [RFC 13/13] net: ti: icssg-prueth: Add ICSSG ethernet driver
> +static int emac_set_link_ksettings(struct net_device *ndev,
> + const struct ethtool_link_ksettings *ecmd)
> +{
> + struct prueth_emac *emac = netdev_priv(ndev);
> +
> + if (!emac->phydev || phy_is_pseudo_fixed_link(emac->phydev))
> + return -EOPNOTSUPP;
> +
> + return phy_ethtool_ksettings_set(emac->phydev, ecmd);
> +}
> +
> +static int emac_get_eee(struct net_device *ndev, struct ethtool_eee *edata)
> +{
> + struct prueth_emac *emac = netdev_priv(ndev);
> +
> + if (!emac->phydev || phy_is_pseudo_fixed_link(emac->phydev))
> + return -EOPNOTSUPP;
> +
> + return phy_ethtool_get_eee(emac->phydev, edata);
> +}
Why do you need the phy_is_pseudo_fixed_link() calls here?
> +/* called back by PHY layer if there is change in link state of hw port*/
> +static void emac_adjust_link(struct net_device *ndev)
> +{
...
> + if (emac->link) {
> + /* link ON */
> + netif_carrier_on(ndev);
> + /* reactivate the transmit queue */
> + netif_tx_wake_all_queues(ndev);
> + } else {
> + /* link OFF */
> + netif_carrier_off(ndev);
> + netif_tx_stop_all_queues(ndev);
> + }
phylib should of set the carrier for you.
> + * emac_ndo_open - EMAC device open
> + * @ndev: network adapter device
> + *
> + * Called when system wants to start the interface.
> + *
> + * Returns 0 for a successful open, or appropriate error code
> + */
> +static int emac_ndo_open(struct net_device *ndev)
> +{
> + struct prueth_emac *emac = netdev_priv(ndev);
> + int ret, i, num_data_chn = emac->tx_ch_num;
> + struct prueth *prueth = emac->prueth;
> + int slice = prueth_emac_slice(emac);
> + struct device *dev = prueth->dev;
> + int max_rx_flows;
> + int rx_flow;
> +
> + /* clear SMEM and MSMC settings for all slices */
> + if (!prueth->emacs_initialized) {
> + memset_io(prueth->msmcram.va, 0, prueth->msmcram.size);
> + memset_io(prueth->shram.va, 0, ICSSG_CONFIG_OFFSET_SLICE1 * PRUETH_NUM_MACS);
> + }
> +
> + /* set h/w MAC as user might have re-configured */
> + ether_addr_copy(emac->mac_addr, ndev->dev_addr);
> +
> + icssg_class_set_mac_addr(prueth->miig_rt, slice, emac->mac_addr);
> + icssg_ft1_set_mac_addr(prueth->miig_rt, slice, emac->mac_addr);
> +
> + icssg_class_default(prueth->miig_rt, slice, 0);
> +
> + netif_carrier_off(ndev);
phylib should take care of this.
> +
> + /* Notify the stack of the actual queue counts. */
> + ret = netif_set_real_num_tx_queues(ndev, num_data_chn);
> + if (ret) {
> + dev_err(dev, "cannot set real number of tx queues\n");
> + return ret;
> + }
> +
> + init_completion(&emac->cmd_complete);
> + ret = prueth_init_tx_chns(emac);
> + if (ret) {
> + dev_err(dev, "failed to init tx channel: %d\n", ret);
> + return ret;
> + }
> +
> + max_rx_flows = PRUETH_MAX_RX_FLOWS;
> + ret = prueth_init_rx_chns(emac, &emac->rx_chns, "rx",
> + max_rx_flows, PRUETH_MAX_RX_DESC);
> + if (ret) {
> + dev_err(dev, "failed to init rx channel: %d\n", ret);
> + goto cleanup_tx;
> + }
> +
> + ret = prueth_ndev_add_tx_napi(emac);
> + if (ret)
> + goto cleanup_rx;
> +
> + /* we use only the highest priority flow for now i.e. @irq[3] */
> + rx_flow = PRUETH_RX_FLOW_DATA;
> + ret = request_irq(emac->rx_chns.irq[rx_flow], prueth_rx_irq,
> + IRQF_TRIGGER_HIGH, dev_name(dev), emac);
> + if (ret) {
> + dev_err(dev, "unable to request RX IRQ\n");
> + goto cleanup_napi;
> + }
> +
> + /* reset and start PRU firmware */
> + ret = prueth_emac_start(prueth, emac);
> + if (ret)
> + goto free_rx_irq;
> +
> + /* Prepare RX */
> + ret = prueth_prepare_rx_chan(emac, &emac->rx_chns, PRUETH_MAX_PKT_SIZE);
> + if (ret)
> + goto stop;
> +
> + ret = k3_udma_glue_enable_rx_chn(emac->rx_chns.rx_chn);
> + if (ret)
> + goto reset_rx_chn;
> +
> + for (i = 0; i < emac->tx_ch_num; i++) {
> + ret = k3_udma_glue_enable_tx_chn(emac->tx_chns[i].tx_chn);
> + if (ret)
> + goto reset_tx_chan;
> + }
> +
> + /* Enable NAPI in Tx and Rx direction */
> + for (i = 0; i < emac->tx_ch_num; i++)
> + napi_enable(&emac->tx_chns[i].napi_tx);
> + napi_enable(&emac->napi_rx);
> +
> + emac_phy_connect(emac);
Why don't you check the error code?
> +static int prueth_config_rgmiidelay(struct prueth *prueth,
> + struct device_node *eth_np,
> + phy_interface_t phy_if)
> +{
> + struct device *dev = prueth->dev;
> + struct regmap *ctrl_mmr;
> + u32 rgmii_tx_id = 0;
> + u32 icssgctrl_reg;
> +
> + if (!phy_interface_mode_is_rgmii(phy_if))
> + return 0;
> +
> + ctrl_mmr = syscon_regmap_lookup_by_phandle(eth_np, "ti,syscon-rgmii-delay");
> + if (IS_ERR(ctrl_mmr)) {
> + dev_err(dev, "couldn't get ti,syscon-rgmii-delay\n");
> + return -ENODEV;
> + }
> +
> + if (of_property_read_u32_index(eth_np, "ti,syscon-rgmii-delay", 1,
> + &icssgctrl_reg)) {
> + dev_err(dev, "couldn't get ti,rgmii-delay reg. offset\n");
> + return -ENODEV;
> + }
> +
> + if (phy_if == PHY_INTERFACE_MODE_RGMII_ID ||
> + phy_if == PHY_INTERFACE_MODE_RGMII_TXID)
> + rgmii_tx_id |= ICSSG_CTRL_RGMII_ID_MODE;
> +
> + regmap_update_bits(ctrl_mmr, icssgctrl_reg, ICSSG_CTRL_RGMII_ID_MODE, rgmii_tx_id);
Do you need to do a units conversion here, or does the register
already take pico seconds?
Andrew
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