Re: [PATCH net-next v12 2/5] net: ti: prueth: Adds ICSSM Ethernet driver

From: Parvathi Pudi
Date: Thu Jul 31 2025 - 10:16:24 EST

Hi,

> On 7/24/2025 12:53 PM, Parvathi Pudi wrote:
>> From: Roger Quadros <rogerq@xxxxxx>
>>
>> Updates Kernel configuration to enable PRUETH driver and its dependencies
>> along with makefile changes to add the new PRUETH driver.
>>
>> Changes includes init and deinit of ICSSM PRU Ethernet driver including
>> net dev registration and firmware loading for DUAL-MAC mode running on
>> PRU-ICSS2 instance.
>>
>> Changes also includes link handling, PRU booting, default firmware loading
>> and PRU stopping using existing remoteproc driver APIs.
>>
>> Signed-off-by: Roger Quadros <rogerq@xxxxxx>
>> Signed-off-by: Andrew F. Davis <afd@xxxxxx>
>> Signed-off-by: Basharath Hussain Khaja <basharath@xxxxxxxxxxx>
>> Signed-off-by: Parvathi Pudi <parvathi@xxxxxxxxxxx>
>> ---
>> drivers/net/ethernet/ti/Kconfig | 12 +
>> drivers/net/ethernet/ti/Makefile | 3 +
>> drivers/net/ethernet/ti/icssm/icssm_prueth.c | 610 +++++++++++++++++++
>> drivers/net/ethernet/ti/icssm/icssm_prueth.h | 100 +++
>> 4 files changed, 725 insertions(+)
>> create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth.c
>> create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth.h
>>
>> diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
>> index a07c910c497a..ab20f22524cb 100644
>> --- a/drivers/net/ethernet/ti/Kconfig
>> +++ b/drivers/net/ethernet/ti/Kconfig
>> @@ -229,4 +229,16 @@ config TI_ICSS_IEP
>> To compile this driver as a module, choose M here. The module
>> will be called icss_iep.
>>
>> +config TI_PRUETH
>> + tristate "TI PRU Ethernet EMAC driver"
>> + depends on PRU_REMOTEPROC
>> + depends on NET_SWITCHDEV
>> + select TI_ICSS_IEP
>> + imply PTP_1588_CLOCK
>> + help
>> + Some TI SoCs has Programmable Realtime Units (PRUs) cores which can
>
> Some TI SoCs have Programmable Realtime Unit (PRU)
>

Sure, We will address this.

>> + support Single or Dual Ethernet ports with help of firmware code running
>
> with the help of firmware code running
>

Sure, We will address this.

>> + on PRU cores. This driver supports remoteproc based communication to
>> + PRU firmware to expose ethernet interface to Linux.
>
> ethernet -> Ethernet
>

Sure, We will address this.

>> +
>> endif # NET_VENDOR_TI
>> diff --git a/drivers/net/ethernet/ti/Makefile b/drivers/net/ethernet/ti/Makefile
>> index cbcf44806924..93c0a4d0e33a 100644
>> --- a/drivers/net/ethernet/ti/Makefile
>> +++ b/drivers/net/ethernet/ti/Makefile
>> @@ -3,6 +3,9 @@
>> # Makefile for the TI network device drivers.
>> #
>>
>> +obj-$(CONFIG_TI_PRUETH) += icssm-prueth.o
>> +icssm-prueth-y := icssm/icssm_prueth.o
>> +
>> obj-$(CONFIG_TI_CPSW) += cpsw-common.o
>> obj-$(CONFIG_TI_DAVINCI_EMAC) += cpsw-common.o
>> obj-$(CONFIG_TI_CPSW_SWITCHDEV) += cpsw-common.o
>> diff --git a/drivers/net/ethernet/ti/icssm/icssm_prueth.c
>> b/drivers/net/ethernet/ti/icssm/icssm_prueth.c
>> new file mode 100644
>> index 000000000000..375fd636684d
>> --- /dev/null
>> +++ b/drivers/net/ethernet/ti/icssm/icssm_prueth.c
>> @@ -0,0 +1,610 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +
>> +/* Texas Instruments ICSSM Ethernet Driver
>> + *
>> + * Copyright (C) 2018-2022 Texas Instruments Incorporated -
>> https://urldefense.com/v3/__https://www.ti.com/__;!!ACWV5N9M2RV99hQ!KJSw49T9tFMkKlUCkufdpPMrYbxZqO8afwgd1oNYrR_r0dienongkVB3K8jc1UDBehhE_eMQGHAGYrvO9wPpJQ$
>> + *
>> + */
>> +
>> +#include <linux/etherdevice.h>
>> +#include <linux/genalloc.h>
>> +#include <linux/if_bridge.h>
>> +#include <linux/if_hsr.h>
>> +#include <linux/if_vlan.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/kernel.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/module.h>
>> +#include <linux/net_tstamp.h>
>> +#include <linux/of.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/of_mdio.h>
>> +#include <linux/of_net.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/phy.h>
>> +#include <linux/remoteproc/pruss.h>
>> +#include <linux/ptp_classify.h>
>> +#include <linux/regmap.h>
>> +#include <linux/remoteproc.h>
>> +#include <net/pkt_cls.h>
>> +
>> +#include "icssm_prueth.h"
>> +
>> +/* called back by PHY layer if there is change in link state of hw port*/
>> +static void icssm_emac_adjust_link(struct net_device *ndev)
>> +{
>> + struct prueth_emac *emac = netdev_priv(ndev);
>> + struct phy_device *phydev = emac->phydev;
>> + bool new_state = false;
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&emac->lock, flags);
>> +
>> + if (phydev->link) {
>> + /* check the mode of operation */
>> + if (phydev->duplex != emac->duplex) {
>> + new_state = true;
>> + emac->duplex = phydev->duplex;
>> + }
>> + if (phydev->speed != emac->speed) {
>> + new_state = true;
>> + emac->speed = phydev->speed;
>> + }
>> + if (!emac->link) {
>> + new_state = true;
>> + emac->link = 1;
>> + }
>> + } else if (emac->link) {
>> + new_state = true;
>> + emac->link = 0;
>> + }
>> +
>> + if (new_state)
>> + phy_print_status(phydev);
>> +
>> + if (emac->link) {
>> + /* reactivate the transmit queue if it is stopped */
>> + if (netif_running(ndev) && netif_queue_stopped(ndev))
>> + netif_wake_queue(ndev);
>> + } else {
>> + if (!netif_queue_stopped(ndev))
>> + netif_stop_queue(ndev);
>> + }
>> +
>> + spin_unlock_irqrestore(&emac->lock, flags);
>> +}
>> +
>> +static int icssm_emac_set_boot_pru(struct prueth_emac *emac,
>> + struct net_device *ndev)
>> +{
>> + const struct prueth_firmware *pru_firmwares;
>> + struct prueth *prueth = emac->prueth;
>> + const char *fw_name;
>> + int ret;
>> +
>> + pru_firmwares = &prueth->fw_data->fw_pru[emac->port_id - 1];
>
> If emac->port_id == 0, this will index at -1
>

We will enter this API for emac->port_id as 1 or 2 always due to the
reason that the physical port indexes are 1 for MII0 and 2 for MII1
which are nothing but PRU0 and PRU1 respectively. Zero is for HOST port
which is a virtual port no PRU core associated to it but it is the ARM
core which is initializing the PRU’s.

>> + fw_name = pru_firmwares->fw_name[prueth->eth_type];
>> + if (!fw_name) {
>> + netdev_err(ndev, "eth_type %d not supported\n",
>> + prueth->eth_type);
>> + return -ENODEV;
>> + }
>> +
>> + ret = rproc_set_firmware(emac->pru, fw_name);
>> + if (ret) {
>> + netdev_err(ndev, "failed to set PRU0 firmware %s: %d\n",
>
> Hardcoded PRU0 in Logs, what if PRU1
>

Sure, We will address this.

We will post the next version soon after net-next is open.


Thanks and Regards,
Parvathi.