RE: [PATCH net-next v10 2/2] net: ethernet: Add driver for Sunplus SP7021

From: Wells Lu 呂芳騰
Date: Thu May 05 2022 - 23:01:17 EST

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In reply to: Paolo Abeni: "Re: [PATCH net-next v10 2/2] net: ethernet: Add driver for Sunplus SP7021"
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Hi Paolo,

> On Mon, 2022-05-02 at 21:23 +0800, Wells Lu wrote:
> > Add driver for Sunplus SP7021 SoC.
> >
> > Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
> > Signed-off-by: Wells Lu <wellslutw@xxxxxxxxx>
> > ---
> > Changes in v10
> > - Addressed comments of Mr. Stephen Hemminger.
> > - Use define NAPI_POLL_WEIGHT.
> > - Return amount of processed packets in spl2sw_tx_poll() and spl2sw_rx_poll().
> > - Addressed comments of Mr. Francois Romien.
> > - Added spin locks for "read-modify-write of int-mask register".
> >
> > MAINTAINERS | 1 +
> > drivers/net/ethernet/Kconfig | 1 +
> > drivers/net/ethernet/Makefile | 1 +
> > drivers/net/ethernet/sunplus/Kconfig | 35 ++
> > drivers/net/ethernet/sunplus/Makefile | 6 +
> > drivers/net/ethernet/sunplus/spl2sw_define.h | 270 ++++++++
> > drivers/net/ethernet/sunplus/spl2sw_desc.c | 228 +++++++
> > drivers/net/ethernet/sunplus/spl2sw_desc.h | 19 +
> > drivers/net/ethernet/sunplus/spl2sw_driver.c | 578 ++++++++++++++++++
> > drivers/net/ethernet/sunplus/spl2sw_int.c | 273 +++++++++
> > drivers/net/ethernet/sunplus/spl2sw_int.h | 13 +
> > drivers/net/ethernet/sunplus/spl2sw_mac.c | 274 +++++++++
> > drivers/net/ethernet/sunplus/spl2sw_mac.h | 18 +
> > drivers/net/ethernet/sunplus/spl2sw_mdio.c | 126 ++++
> > drivers/net/ethernet/sunplus/spl2sw_mdio.h | 12 +
> > drivers/net/ethernet/sunplus/spl2sw_phy.c | 92 +++
> > drivers/net/ethernet/sunplus/spl2sw_phy.h | 12 +
> > .../net/ethernet/sunplus/spl2sw_register.h | 86 +++
> > 18 files changed, 2045 insertions(+)
> > create mode 100644 drivers/net/ethernet/sunplus/Kconfig
> > create mode 100644 drivers/net/ethernet/sunplus/Makefile
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_define.h
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_desc.c
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_desc.h
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_driver.c
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_int.c
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_int.h
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_mac.c
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_mac.h
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_mdio.c
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_mdio.h
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_phy.c
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_phy.h
> > create mode 100644 drivers/net/ethernet/sunplus/spl2sw_register.h
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS index 22a2f9699..11a062c42
> > 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -18890,6 +18890,7 @@ L: netdev@xxxxxxxxxxxxxxx
> > S: Maintained
> > W: https://sunplus.atlassian.net/wiki/spaces/doc/overview
> > F: Documentation/devicetree/bindings/net/sunplus,sp7021-emac.yaml
> > +F: drivers/net/ethernet/sunplus/
> >
> > SUNPLUS OCOTP DRIVER
> > M: Vincent Shih <vincent.sunplus@xxxxxxxxx>
> > diff --git a/drivers/net/ethernet/Kconfig
> > b/drivers/net/ethernet/Kconfig index 827993022..955abbc54 100644
> > --- a/drivers/net/ethernet/Kconfig
> > +++ b/drivers/net/ethernet/Kconfig
> > @@ -179,6 +179,7 @@ source "drivers/net/ethernet/smsc/Kconfig"
> > source "drivers/net/ethernet/socionext/Kconfig"
> > source "drivers/net/ethernet/stmicro/Kconfig"
> > source "drivers/net/ethernet/sun/Kconfig"
> > +source "drivers/net/ethernet/sunplus/Kconfig"
> > source "drivers/net/ethernet/synopsys/Kconfig"
> > source "drivers/net/ethernet/tehuti/Kconfig"
> > source "drivers/net/ethernet/ti/Kconfig"
> > diff --git a/drivers/net/ethernet/Makefile
> > b/drivers/net/ethernet/Makefile index 8ef43e0c3..9eb011699 100644
> > --- a/drivers/net/ethernet/Makefile
> > +++ b/drivers/net/ethernet/Makefile
> > @@ -90,6 +90,7 @@ obj-$(CONFIG_NET_VENDOR_SMSC) += smsc/
> > obj-$(CONFIG_NET_VENDOR_SOCIONEXT) += socionext/
> > obj-$(CONFIG_NET_VENDOR_STMICRO) += stmicro/
> > obj-$(CONFIG_NET_VENDOR_SUN) += sun/
> > +obj-$(CONFIG_NET_VENDOR_SUNPLUS) += sunplus/
> > obj-$(CONFIG_NET_VENDOR_TEHUTI) += tehuti/
> > obj-$(CONFIG_NET_VENDOR_TI) += ti/
> > obj-$(CONFIG_NET_VENDOR_TOSHIBA) += toshiba/ diff --git
> > a/drivers/net/ethernet/sunplus/Kconfig
> > b/drivers/net/ethernet/sunplus/Kconfig
> > new file mode 100644
> > index 000000000..d0144a2ab
> > --- /dev/null
> > +++ b/drivers/net/ethernet/sunplus/Kconfig
> > @@ -0,0 +1,35 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +#
> > +# Sunplus network device configuration #
> > +
> > +config NET_VENDOR_SUNPLUS
> > + bool "Sunplus devices"
> > + default y
> > + depends on ARCH_SUNPLUS || COMPILE_TEST
> > + help
> > + If you have a network (Ethernet) card belonging to this
> > + class, say Y here.
> > +
> > + Note that the answer to this question doesn't directly
> > + affect the kernel: saying N will just cause the configurator
> > + to skip all the questions about Sunplus cards. If you say Y,
> > + you will be asked for your specific card in the following
> > + questions.
> > +
> > +if NET_VENDOR_SUNPLUS
> > +
> > +config SP7021_EMAC
> > + tristate "Sunplus Dual 10M/100M Ethernet devices"
> > + depends on SOC_SP7021 || COMPILE_TEST
> > + select PHYLIB
> > + select COMMON_CLK_SP7021
> > + select RESET_SUNPLUS
> > + select NVMEM_SUNPLUS_OCOTP
> > + help
> > + If you have Sunplus dual 10M/100M Ethernet devices, say Y.
> > + The network device creates two net-device interfaces.
> > + To compile this driver as a module, choose M here. The
> > + module will be called sp7021_emac.
> > +
> > +endif # NET_VENDOR_SUNPLUS
> > diff --git a/drivers/net/ethernet/sunplus/Makefile
> > b/drivers/net/ethernet/sunplus/Makefile
> > new file mode 100644
> > index 000000000..ef7d7d0a7
> > --- /dev/null
> > +++ b/drivers/net/ethernet/sunplus/Makefile
> > @@ -0,0 +1,6 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +#
> > +# Makefile for the Sunplus network device drivers.
> > +#
> > +obj-$(CONFIG_SP7021_EMAC) += sp7021_emac.o sp7021_emac-objs :=
> > +spl2sw_driver.o spl2sw_int.o spl2sw_desc.o spl2sw_mac.o spl2sw_mdio.o
> > +spl2sw_phy.o
> > diff --git a/drivers/net/ethernet/sunplus/spl2sw_define.h
> > b/drivers/net/ethernet/sunplus/spl2sw_define.h
> > new file mode 100644
> > index 000000000..acc6c1228
> > --- /dev/null
> > +++ b/drivers/net/ethernet/sunplus/spl2sw_define.h
> > @@ -0,0 +1,270 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/* Copyright Sunplus Technology Co., Ltd.
> > + * All rights reserved.
> > + */
> > +
> > +#ifndef __SPL2SW_DEFINE_H__
> > +#define __SPL2SW_DEFINE_H__
> > +
> > +#define MAX_NETDEV_NUM 2 /* Maximum # of net-device */
> > +
> > +/* Interrupt status */
> > +#define MAC_INT_DAISY_MODE_CHG BIT(31) /* Daisy Mode Change */
> > +#define MAC_INT_IP_CHKSUM_ERR BIT(23) /* IP Checksum Append Error */
> > +#define MAC_INT_WDOG_TIMER1_EXP BIT(22) /* Watchdog Timer1 Expired */
> > +#define MAC_INT_WDOG_TIMER0_EXP BIT(21) /* Watchdog Timer0 Expired */
> > +#define MAC_INT_INTRUDER_ALERT BIT(20) /* Atruder Alert */
> > +#define MAC_INT_PORT_ST_CHG BIT(19) /* Port Status Change */
> > +#define MAC_INT_BC_STORM BIT(18) /* Broad Cast Storm */
> > +#define MAC_INT_MUST_DROP_LAN BIT(17) /* Global Queue Exhausted */
> > +#define MAC_INT_GLOBAL_QUE_FULL BIT(16) /* Global Queue Full */
> > +#define MAC_INT_TX_SOC_PAUSE_ON BIT(15) /* Soc Port TX Pause On */
> > +#define MAC_INT_RX_SOC_QUE_FULL BIT(14) /* Soc Port Out Queue Full */
> > +#define MAC_INT_TX_LAN1_QUE_FULL BIT(9) /* Port 1 Out Queue Full */
> > +#define MAC_INT_TX_LAN0_QUE_FULL BIT(8) /* Port 0 Out Queue Full */
> > +#define MAC_INT_RX_L_DESCF BIT(7) /* Low Priority Descriptor Full */
> > +#define MAC_INT_RX_H_DESCF BIT(6) /* High Priority Descriptor Full */
> > +#define MAC_INT_RX_DONE_L BIT(5) /* RX Low Priority Done */
> > +#define MAC_INT_RX_DONE_H BIT(4) /* RX High Priority Done */
> > +#define MAC_INT_TX_DONE_L BIT(3) /* TX Low Priority Done */
> > +#define MAC_INT_TX_DONE_H BIT(2) /* TX High Priority Done */
> > +#define MAC_INT_TX_DES_ERR BIT(1) /* TX Descriptor Error */
> > +#define MAC_INT_RX_DES_ERR BIT(0) /* Rx Descriptor Error */
> > +
> > +#define MAC_INT_RX (MAC_INT_RX_DONE_H | MAC_INT_RX_DONE_L | \
> > + MAC_INT_RX_DES_ERR)
> > +#define MAC_INT_TX (MAC_INT_TX_DONE_L | MAC_INT_TX_DONE_H | \
> > + MAC_INT_TX_DES_ERR)
> > +#define MAC_INT_MASK_DEF (MAC_INT_DAISY_MODE_CHG | MAC_INT_IP_CHKSUM_ERR | \
> > + MAC_INT_WDOG_TIMER1_EXP | MAC_INT_WDOG_TIMER0_EXP | \
> > + MAC_INT_INTRUDER_ALERT | MAC_INT_PORT_ST_CHG | \
> > + MAC_INT_BC_STORM | MAC_INT_MUST_DROP_LAN | \
> > + MAC_INT_GLOBAL_QUE_FULL | MAC_INT_TX_SOC_PAUSE_ON | \
> > + MAC_INT_RX_SOC_QUE_FULL | MAC_INT_TX_LAN1_QUE_FULL | \
> > + MAC_INT_TX_LAN0_QUE_FULL | MAC_INT_RX_L_DESCF | \
> > + MAC_INT_RX_H_DESCF)
> > +
> > +/* Address table search */
> > +#define MAC_ADDR_LOOKUP_IDLE BIT(2)
> > +#define MAC_SEARCH_NEXT_ADDR BIT(1)
> > +#define MAC_BEGIN_SEARCH_ADDR BIT(0)
> > +
> > +/* Address table status */
> > +#define MAC_HASH_LOOKUP_ADDR GENMASK(31, 22)
> > +#define MAC_R_PORT_MAP GENMASK(13, 12)
> > +#define MAC_R_CPU_PORT GENMASK(11, 10)
> > +#define MAC_R_VID GENMASK(9, 7)
> > +#define MAC_R_AGE GENMASK(6, 4)
> > +#define MAC_R_PROXY BIT(3)
> > +#define MAC_R_MC_INGRESS BIT(2)
> > +#define MAC_AT_TABLE_END BIT(1)
> > +#define MAC_AT_DATA_READY BIT(0)
> > +
> > +/* Wt mac ad0 */
> > +#define MAC_W_PORT_MAP GENMASK(13, 12)
> > +#define MAC_W_LAN_PORT_1 BIT(13)
> > +#define MAC_W_LAN_PORT_0 BIT(12)
> > +#define MAC_W_CPU_PORT GENMASK(11, 10)
> > +#define MAC_W_CPU_PORT_1 BIT(11)
> > +#define MAC_W_CPU_PORT_0 BIT(10)
> > +#define MAC_W_VID GENMASK(9, 7)
> > +#define MAC_W_AGE GENMASK(6, 4)
> > +#define MAC_W_PROXY BIT(3)
> > +#define MAC_W_MC_INGRESS BIT(2)
> > +#define MAC_W_MAC_DONE BIT(1)
> > +#define MAC_W_MAC_CMD BIT(0)
> > +
> > +/* W mac 15_0 bus */
> > +#define MAC_W_MAC_15_0 GENMASK(15, 0)
> > +
> > +/* W mac 47_16 bus */
> > +#define MAC_W_MAC_47_16 GENMASK(31, 0)
> > +
> > +/* PVID config 0 */
> > +#define MAC_P1_PVID GENMASK(6, 4)
> > +#define MAC_P0_PVID GENMASK(2, 0)
> > +
> > +/* VLAN member config 0 */
> > +#define MAC_VLAN_MEMSET_3 GENMASK(27, 24)
> > +#define MAC_VLAN_MEMSET_2 GENMASK(19, 16)
> > +#define MAC_VLAN_MEMSET_1 GENMASK(11, 8)
> > +#define MAC_VLAN_MEMSET_0 GENMASK(3, 0)
> > +
> > +/* VLAN member config 1 */
> > +#define MAC_VLAN_MEMSET_5 GENMASK(11, 8)
> > +#define MAC_VLAN_MEMSET_4 GENMASK(3, 0)
> > +
> > +/* Port ability */
> > +#define MAC_PORT_ABILITY_LINK_ST GENMASK(25, 24)
> > +
> > +/* CPU control */
> > +#define MAC_EN_SOC1_AGING BIT(15)
> > +#define MAC_EN_SOC0_AGING BIT(14)
> > +#define MAC_DIS_LRN_SOC1 BIT(13)
> > +#define MAC_DIS_LRN_SOC0 BIT(12)
> > +#define MAC_EN_CRC_SOC1 BIT(9)
> > +#define MAC_EN_CRC_SOC0 BIT(8)
> > +#define MAC_DIS_SOC1_CPU BIT(7)
> > +#define MAC_DIS_SOC0_CPU BIT(6)
> > +#define MAC_DIS_BC2CPU_P1 BIT(5)
> > +#define MAC_DIS_BC2CPU_P0 BIT(4)
> > +#define MAC_DIS_MC2CPU GENMASK(3, 2)
> > +#define MAC_DIS_MC2CPU_P1 BIT(3)
> > +#define MAC_DIS_MC2CPU_P0 BIT(2)
> > +#define MAC_DIS_UN2CPU GENMASK(1, 0)
> > +
> > +/* Port control 0 */
> > +#define MAC_DIS_PORT GENMASK(25, 24)
> > +#define MAC_DIS_PORT1 BIT(25)
> > +#define MAC_DIS_PORT0 BIT(24)
> > +#define MAC_DIS_RMC2CPU_P1 BIT(17)
> > +#define MAC_DIS_RMC2CPU_P0 BIT(16)
> > +#define MAC_EN_FLOW_CTL_P1 BIT(9)
> > +#define MAC_EN_FLOW_CTL_P0 BIT(8)
> > +#define MAC_EN_BACK_PRESS_P1 BIT(1)
> > +#define MAC_EN_BACK_PRESS_P0 BIT(0)
> > +
> > +/* Port control 1 */
> > +#define MAC_DIS_SA_LRN_P1 BIT(9)
> > +#define MAC_DIS_SA_LRN_P0 BIT(8)
> > +
> > +/* Port control 2 */
> > +#define MAC_EN_AGING_P1 BIT(9)
> > +#define MAC_EN_AGING_P0 BIT(8)
> > +
> > +/* Switch Global control */
> > +#define MAC_RMC_TB_FAULT_RULE GENMASK(26, 25)
> > +#define MAC_LED_FLASH_TIME GENMASK(24, 23)
> > +#define MAC_BC_STORM_PREV GENMASK(5, 4)
> > +
> > +/* LED port 0 */
> > +#define MAC_LED_ACT_HI BIT(28)
> > +
> > +/* PHY control register 0 */
> > +#define MAC_CPU_PHY_WT_DATA GENMASK(31, 16)
> > +#define MAC_CPU_PHY_CMD GENMASK(14, 13)
> > +#define MAC_CPU_PHY_REG_ADDR GENMASK(12, 8)
> > +#define MAC_CPU_PHY_ADDR GENMASK(4, 0)
> > +
> > +/* PHY control register 1 */
> > +#define MAC_CPU_PHY_RD_DATA GENMASK(31, 16)
> > +#define MAC_PHY_RD_RDY BIT(1)
> > +#define MAC_PHY_WT_DONE BIT(0)
> > +
> > +/* MAC force mode */
> > +#define MAC_EXT_PHY1_ADDR GENMASK(28, 24)
> > +#define MAC_EXT_PHY0_ADDR GENMASK(20, 16)
> > +#define MAC_FORCE_RMII_LINK GENMASK(9, 8)
> > +#define MAC_FORCE_RMII_EN_1 BIT(7)
> > +#define MAC_FORCE_RMII_EN_0 BIT(6)
> > +#define MAC_FORCE_RMII_FC GENMASK(5, 4)
> > +#define MAC_FORCE_RMII_DPX GENMASK(3, 2)
> > +#define MAC_FORCE_RMII_SPD GENMASK(1, 0)
> > +
> > +/* CPU transmit trigger */
> > +#define MAC_TRIG_L_SOC0 BIT(1)
> > +#define MAC_TRIG_H_SOC0 BIT(0)
> > +
> > +/* Config descriptor queue */
> > +#define TX_DESC_NUM 16 /* # of descriptors in TX queue */
> > +#define MAC_GUARD_DESC_NUM 2 /* # of descriptors of gap 0 */
> > +#define RX_QUEUE0_DESC_NUM 16 /* # of descriptors in RX queue 0 */
> > +#define RX_QUEUE1_DESC_NUM 16 /* # of descriptors in RX queue 1 */
> > +#define TX_DESC_QUEUE_NUM 1 /* # of TX queue */
> > +#define RX_DESC_QUEUE_NUM 2 /* # of RX queue */
> > +
> > +#define MAC_RX_LEN_MAX 2047 /* Size of RX buffer */
> > +
> > +/* Tx descriptor */
> > +/* cmd1 */
> > +#define TXD_OWN BIT(31)
> > +#define TXD_ERR_CODE GENMASK(29, 26)
> > +#define TXD_SOP BIT(25) /* start of a packet */
> > +#define TXD_EOP BIT(24) /* end of a packet */
> > +#define TXD_VLAN GENMASK(17, 12)
> > +#define TXD_PKT_LEN GENMASK(10, 0) /* packet length */
> > +/* cmd2 */
> > +#define TXD_EOR BIT(31) /* end of ring */
> > +#define TXD_BUF_LEN2 GENMASK(22, 12)
> > +#define TXD_BUF_LEN1 GENMASK(10, 0)
> > +
> > +/* Rx descriptor */
> > +/* cmd1 */
> > +#define RXD_OWN BIT(31)
> > +#define RXD_ERR_CODE GENMASK(29, 26)
> > +#define RXD_TCP_UDP_CHKSUM BIT(23)
> > +#define RXD_PROXY BIT(22)
> > +#define RXD_PROTOCOL GENMASK(21, 20)
> > +#define RXD_VLAN_TAG BIT(19)
> > +#define RXD_IP_CHKSUM BIT(18)
> > +#define RXD_ROUTE_TYPE GENMASK(17, 16)
> > +#define RXD_PKT_SP GENMASK(14, 12) /* packet source port */
> > +#define RXD_PKT_LEN GENMASK(10, 0) /* packet length */
> > +/* cmd2 */
> > +#define RXD_EOR BIT(31) /* end of ring */
> > +#define RXD_BUF_LEN2 GENMASK(22, 12)
> > +#define RXD_BUF_LEN1 GENMASK(10, 0)
> > +
> > +/* structure of descriptor */
> > +struct spl2sw_mac_desc {
> > + u32 cmd1;
> > + u32 cmd2;
> > + u32 addr1;
> > + u32 addr2;
> > +};
> > +
> > +struct spl2sw_skb_info {
> > + struct sk_buff *skb;
> > + u32 mapping;
> > + u32 len;
> > +};
> > +
> > +struct spl2sw_common {
> > + void __iomem *l2sw_reg_base;
> > +
> > + struct platform_device *pdev;
> > + struct reset_control *rstc;
> > + struct clk *clk;
> > +
> > + void *desc_base;
> > + dma_addr_t desc_dma;
> > + s32 desc_size;
> > + struct spl2sw_mac_desc *rx_desc[RX_DESC_QUEUE_NUM];
> > + struct spl2sw_skb_info *rx_skb_info[RX_DESC_QUEUE_NUM];
> > + u32 rx_pos[RX_DESC_QUEUE_NUM];
> > + u32 rx_desc_num[RX_DESC_QUEUE_NUM];
> > + u32 rx_desc_buff_size;
> > +
> > + struct spl2sw_mac_desc *tx_desc;
> > + struct spl2sw_skb_info tx_temp_skb_info[TX_DESC_NUM];
> > + u32 tx_done_pos;
> > + u32 tx_pos;
> > + u32 tx_desc_full;
> > +
> > + struct net_device *ndev[MAX_NETDEV_NUM];
> > + struct mii_bus *mii_bus;
> > +
> > + struct napi_struct rx_napi;
> > + struct napi_struct tx_napi;
> > +
> > + spinlock_t tx_lock; /* spinlock for accessing tx buffer */
> > + spinlock_t mdio_lock; /* spinlock for mdio commands */
> > + spinlock_t int_mask_lock; /* spinlock for accessing int mask reg. */
> > +
> > + u8 enable;
> > +};
> > +
> > +struct spl2sw_mac {
> > + struct net_device *ndev;
> > + struct spl2sw_common *comm;
> > +
> > + u8 mac_addr[ETH_ALEN];
> > + phy_interface_t phy_mode;
> > + struct device_node *phy_node;
> > +
> > + u8 lan_port;
> > + u8 to_vlan;
> > + u8 vlan_id;
> > +};
> > +
> > +#endif
> > diff --git a/drivers/net/ethernet/sunplus/spl2sw_desc.c
> > b/drivers/net/ethernet/sunplus/spl2sw_desc.c
> > new file mode 100644
> > index 000000000..3f0d9f78b
> > --- /dev/null
> > +++ b/drivers/net/ethernet/sunplus/spl2sw_desc.c
> > @@ -0,0 +1,228 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/* Copyright Sunplus Technology Co., Ltd.
> > + * All rights reserved.
> > + */
> > +
> > +#include <linux/platform_device.h>
> > +#include <linux/netdevice.h>
> > +#include <linux/of_mdio.h>
> > +
> > +#include "spl2sw_define.h"
> > +#include "spl2sw_desc.h"
> > +
> > +void spl2sw_rx_descs_flush(struct spl2sw_common *comm) {
> > + struct spl2sw_skb_info *rx_skbinfo;
> > + struct spl2sw_mac_desc *rx_desc;
> > + u32 i, j;
> > +
> > + for (i = 0; i < RX_DESC_QUEUE_NUM; i++) {
> > + rx_desc = comm->rx_desc[i];
> > + rx_skbinfo = comm->rx_skb_info[i];
> > + for (j = 0; j < comm->rx_desc_num[i]; j++) {
> > + rx_desc[j].addr1 = rx_skbinfo[j].mapping;
> > + rx_desc[j].cmd2 = (j == comm->rx_desc_num[i] - 1) ?
> > + RXD_EOR | comm->rx_desc_buff_size :
> > + comm->rx_desc_buff_size;
> > + wmb(); /* Set RXD_OWN after other fields are ready. */
> > + rx_desc[j].cmd1 = RXD_OWN;
> > + }
> > + }
> > +}
> > +
> > +void spl2sw_tx_descs_clean(struct spl2sw_common *comm) {
> > + u32 i;
> > +
> > + if (!comm->tx_desc)
> > + return;
> > +
> > + for (i = 0; i < TX_DESC_NUM; i++) {
> > + comm->tx_desc[i].cmd1 = 0;
> > + wmb(); /* Clear TXD_OWN and then set other fields. */
> > + comm->tx_desc[i].cmd2 = 0;
> > + comm->tx_desc[i].addr1 = 0;
> > + comm->tx_desc[i].addr2 = 0;
> > +
> > + if (comm->tx_temp_skb_info[i].mapping) {
> > + dma_unmap_single(&comm->pdev->dev, comm->tx_temp_skb_info[i].mapping,
> > + comm->tx_temp_skb_info[i].skb->len, DMA_TO_DEVICE);
> > + comm->tx_temp_skb_info[i].mapping = 0;
> > + }
> > +
> > + if (comm->tx_temp_skb_info[i].skb) {
> > + dev_kfree_skb_any(comm->tx_temp_skb_info[i].skb);
> > + comm->tx_temp_skb_info[i].skb = NULL;
> > + }
> > + }
> > +}
> > +
> > +void spl2sw_rx_descs_clean(struct spl2sw_common *comm) {
> > + struct spl2sw_skb_info *rx_skbinfo;
> > + struct spl2sw_mac_desc *rx_desc;
> > + u32 i, j;
> > +
> > + for (i = 0; i < RX_DESC_QUEUE_NUM; i++) {
> > + if (!comm->rx_skb_info[i])
> > + continue;
> > +
> > + rx_desc = comm->rx_desc[i];
> > + rx_skbinfo = comm->rx_skb_info[i];
> > + for (j = 0; j < comm->rx_desc_num[i]; j++) {
> > + rx_desc[j].cmd1 = 0;
> > + wmb(); /* Clear RXD_OWN and then set other fields. */
> > + rx_desc[j].cmd2 = 0;
> > + rx_desc[j].addr1 = 0;
> > +
> > + if (rx_skbinfo[j].skb) {
> > + dma_unmap_single(&comm->pdev->dev, rx_skbinfo[j].mapping,
> > + comm->rx_desc_buff_size, DMA_FROM_DEVICE);
> > + dev_kfree_skb_any(rx_skbinfo[j].skb);
> > + rx_skbinfo[j].skb = NULL;
> > + rx_skbinfo[j].mapping = 0;
> > + }
> > + }
> > +
> > + kfree(rx_skbinfo);
> > + comm->rx_skb_info[i] = NULL;
> > + }
> > +}
> > +
> > +void spl2sw_descs_clean(struct spl2sw_common *comm) {
> > + spl2sw_rx_descs_clean(comm);
> > + spl2sw_tx_descs_clean(comm);
> > +}
> > +
> > +void spl2sw_descs_free(struct spl2sw_common *comm) {
> > + u32 i;
> > +
> > + spl2sw_descs_clean(comm);
> > + comm->tx_desc = NULL;
> > + for (i = 0; i < RX_DESC_QUEUE_NUM; i++)
> > + comm->rx_desc[i] = NULL;
> > +
> > + /* Free descriptor area */
> > + if (comm->desc_base) {
> > + dma_free_coherent(&comm->pdev->dev, comm->desc_size, comm->desc_base,
> > + comm->desc_dma);
> > + comm->desc_base = NULL;
> > + comm->desc_dma = 0;
> > + comm->desc_size = 0;
> > + }
> > +}
> > +
> > +void spl2sw_tx_descs_init(struct spl2sw_common *comm) {
> > + memset(comm->tx_desc, '\0', sizeof(struct spl2sw_mac_desc) *
> > + (TX_DESC_NUM + MAC_GUARD_DESC_NUM)); }
> > +
> > +int spl2sw_rx_descs_init(struct spl2sw_common *comm) {
> > + struct spl2sw_skb_info *rx_skbinfo;
> > + struct spl2sw_mac_desc *rx_desc;
> > + struct sk_buff *skb;
> > + u32 mapping;
> > + u32 i, j;
> > +
> > + for (i = 0; i < RX_DESC_QUEUE_NUM; i++) {
> > + comm->rx_skb_info[i] = kcalloc(comm->rx_desc_num[i], sizeof(*rx_skbinfo),
> > + GFP_KERNEL | GFP_DMA);
> > + if (!comm->rx_skb_info[i])
> > + goto mem_alloc_fail;
> > +
> > + rx_skbinfo = comm->rx_skb_info[i];
> > + rx_desc = comm->rx_desc[i];
> > + for (j = 0; j < comm->rx_desc_num[i]; j++) {
> > + skb = netdev_alloc_skb(NULL, comm->rx_desc_buff_size);
> > + if (!skb)
> > + goto mem_alloc_fail;
> > +
> > + rx_skbinfo[j].skb = skb;
> > + mapping = dma_map_single(&comm->pdev->dev, skb->data,
> > + comm->rx_desc_buff_size,
> > + DMA_FROM_DEVICE);
> > + if (dma_mapping_error(&comm->pdev->dev, mapping))
> > + goto mem_alloc_fail;
> > +
> > + rx_skbinfo[j].mapping = mapping;
> > + rx_desc[j].addr1 = mapping;
> > + rx_desc[j].addr2 = 0;
> > + rx_desc[j].cmd2 = (j == comm->rx_desc_num[i] - 1) ?
> > + RXD_EOR | comm->rx_desc_buff_size :
> > + comm->rx_desc_buff_size;
> > + wmb(); /* Set RXD_OWN after other fields are effective. */
> > + rx_desc[j].cmd1 = RXD_OWN;
> > + }
> > + }
> > +
> > + return 0;
> > +
> > +mem_alloc_fail:
> > + spl2sw_rx_descs_clean(comm);
> > + return -ENOMEM;
> > +}
> > +
> > +int spl2sw_descs_alloc(struct spl2sw_common *comm) {
> > + s32 desc_size;
> > + u32 i;
> > +
> > + /* Alloc descriptor area */
> > + desc_size = (TX_DESC_NUM + MAC_GUARD_DESC_NUM) * sizeof(struct spl2sw_mac_desc);
> > + for (i = 0; i < RX_DESC_QUEUE_NUM; i++)
> > + desc_size += comm->rx_desc_num[i] * sizeof(struct spl2sw_mac_desc);
> > +
> > + comm->desc_base = dma_alloc_coherent(&comm->pdev->dev, desc_size,
> &comm->desc_dma,
> > + GFP_KERNEL);
> > + if (!comm->desc_base)
> > + return -ENOMEM;
> > +
> > + comm->desc_size = desc_size;
> > +
> > + /* Setup Tx descriptor */
> > + comm->tx_desc = comm->desc_base;
> > +
> > + /* Setup Rx descriptor */
> > + comm->rx_desc[0] = &comm->tx_desc[TX_DESC_NUM + MAC_GUARD_DESC_NUM];
> > + for (i = 1; i < RX_DESC_QUEUE_NUM; i++)
> > + comm->rx_desc[i] = comm->rx_desc[i - 1] + comm->rx_desc_num[i - 1];
> > +
> > + return 0;
> > +}
> > +
> > +int spl2sw_descs_init(struct spl2sw_common *comm) {
> > + u32 i, ret;
> > +
> > + /* Initialize rx descriptor's data */
> > + comm->rx_desc_num[0] = RX_QUEUE0_DESC_NUM;
> > + comm->rx_desc_num[1] = RX_QUEUE1_DESC_NUM;
> > +
> > + for (i = 0; i < RX_DESC_QUEUE_NUM; i++) {
> > + comm->rx_desc[i] = NULL;
> > + comm->rx_skb_info[i] = NULL;
> > + comm->rx_pos[i] = 0;
> > + }
> > + comm->rx_desc_buff_size = MAC_RX_LEN_MAX;
> > +
> > + /* Initialize tx descriptor's data */
> > + comm->tx_done_pos = 0;
> > + comm->tx_desc = NULL;
> > + comm->tx_pos = 0;
> > + comm->tx_desc_full = 0;
> > + for (i = 0; i < TX_DESC_NUM; i++)
> > + comm->tx_temp_skb_info[i].skb = NULL;
> > +
> > + /* Allocate tx & rx descriptors. */
> > + ret = spl2sw_descs_alloc(comm);
> > + if (ret)
> > + return ret;
> > +
> > + spl2sw_tx_descs_init(comm);
> > +
> > + return spl2sw_rx_descs_init(comm);
> > +}
> > diff --git a/drivers/net/ethernet/sunplus/spl2sw_desc.h
> > b/drivers/net/ethernet/sunplus/spl2sw_desc.h
> > new file mode 100644
> > index 000000000..f04e2d85c
> > --- /dev/null
> > +++ b/drivers/net/ethernet/sunplus/spl2sw_desc.h
> > @@ -0,0 +1,19 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/* Copyright Sunplus Technology Co., Ltd.
> > + * All rights reserved.
> > + */
> > +
> > +#ifndef __SPL2SW_DESC_H__
> > +#define __SPL2SW_DESC_H__
> > +
> > +void spl2sw_rx_descs_flush(struct spl2sw_common *comm); void
> > +spl2sw_tx_descs_clean(struct spl2sw_common *comm); void
> > +spl2sw_rx_descs_clean(struct spl2sw_common *comm); void
> > +spl2sw_descs_clean(struct spl2sw_common *comm); void
> > +spl2sw_descs_free(struct spl2sw_common *comm); void
> > +spl2sw_tx_descs_init(struct spl2sw_common *comm); int
> > +spl2sw_rx_descs_init(struct spl2sw_common *comm); int
> > +spl2sw_descs_alloc(struct spl2sw_common *comm); int
> > +spl2sw_descs_init(struct spl2sw_common *comm);
> > +
> > +#endif
> > diff --git a/drivers/net/ethernet/sunplus/spl2sw_driver.c
> > b/drivers/net/ethernet/sunplus/spl2sw_driver.c
> > new file mode 100644
> > index 000000000..8320fa833
> > --- /dev/null
> > +++ b/drivers/net/ethernet/sunplus/spl2sw_driver.c
> > @@ -0,0 +1,578 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/* Copyright Sunplus Technology Co., Ltd.
> > + * All rights reserved.
> > + */
> > +
> > +#include <linux/platform_device.h>
> > +#include <linux/nvmem-consumer.h>
> > +#include <linux/etherdevice.h>
> > +#include <linux/netdevice.h>
> > +#include <linux/spinlock.h>
> > +#include <linux/of_net.h>
> > +#include <linux/reset.h>
> > +#include <linux/clk.h>
> > +#include <linux/of.h>
> > +
> > +#include "spl2sw_register.h"
> > +#include "spl2sw_define.h"
> > +#include "spl2sw_desc.h"
> > +#include "spl2sw_mdio.h"
> > +#include "spl2sw_phy.h"
> > +#include "spl2sw_int.h"
> > +#include "spl2sw_mac.h"
> > +
> > +/* net device operations */
> > +static int spl2sw_ethernet_open(struct net_device *ndev) {
> > + struct spl2sw_mac *mac = netdev_priv(ndev);
> > + struct spl2sw_common *comm = mac->comm;
> > + u32 mask;
> > +
> > + netdev_dbg(ndev, "Open port = %x\n", mac->lan_port);
> > +
> > + comm->enable |= mac->lan_port;
> > +
> > + spl2sw_mac_hw_start(comm);
> > +
> > + /* Enable TX and RX interrupts */
> > + mask = readl(comm->l2sw_reg_base + L2SW_SW_INT_MASK_0);
> > + mask &= ~(MAC_INT_TX | MAC_INT_RX);
> > + writel(mask, comm->l2sw_reg_base + L2SW_SW_INT_MASK_0);
> > +
> > + phy_start(ndev->phydev);
> > +
> > + netif_start_queue(ndev);
> > +
> > + return 0;
> > +}
> > +
> > +static int spl2sw_ethernet_stop(struct net_device *ndev) {
> > + struct spl2sw_mac *mac = netdev_priv(ndev);
> > + struct spl2sw_common *comm = mac->comm;
> > +
> > + netif_stop_queue(ndev);
> > +
> > + comm->enable &= ~mac->lan_port;
> > +
> > + phy_stop(ndev->phydev);
> > +
> > + spl2sw_mac_hw_stop(comm);
> > +
> > + return 0;
> > +}
> > +
> > +static int spl2sw_ethernet_start_xmit(struct sk_buff *skb, struct
> > +net_device *ndev) {
> > + struct spl2sw_mac *mac = netdev_priv(ndev);
> > + struct spl2sw_common *comm = mac->comm;
> > + struct spl2sw_skb_info *skbinfo;
> > + struct spl2sw_mac_desc *txdesc;
> > + unsigned long flags;
> > + u32 mapping;
> > + u32 tx_pos;
> > + u32 cmd1;
> > + u32 cmd2;
> > +
> > + if (unlikely(comm->tx_desc_full == 1)) {
> > + /* No TX descriptors left. Wait for tx interrupt. */
> > + netdev_dbg(ndev, "TX descriptor queue full when xmit!\n");
> > + return NETDEV_TX_BUSY;
> > + }
> > +
> > + /* If skb size is shorter than ETH_ZLEN (60), pad it with 0. */
> > + if (unlikely(skb->len < ETH_ZLEN)) {
> > + if (skb_padto(skb, ETH_ZLEN))
> > + return NETDEV_TX_OK;
> > +
> > + skb_put(skb, ETH_ZLEN - skb->len);
> > + }
> > +
> > + mapping = dma_map_single(&comm->pdev->dev, skb->data,
> > + skb->len, DMA_TO_DEVICE);
> > + if (dma_mapping_error(&comm->pdev->dev, mapping)) {
> > + ndev->stats.tx_errors++;
> > + dev_kfree_skb(skb);
> > + return NETDEV_TX_OK;
> > + }
> > +
> > + spin_lock_irqsave(&comm->tx_lock, flags);
> > +
> > + tx_pos = comm->tx_pos;
> > + txdesc = &comm->tx_desc[tx_pos];
> > + skbinfo = &comm->tx_temp_skb_info[tx_pos];
> > + skbinfo->mapping = mapping;
> > + skbinfo->len = skb->len;
> > + skbinfo->skb = skb;
> > +
> > + /* Set up a TX descriptor */
> > + cmd1 = TXD_OWN | TXD_SOP | TXD_EOP | (mac->to_vlan << 12) |
> > + (skb->len & TXD_PKT_LEN);
> > + cmd2 = skb->len & TXD_BUF_LEN1;
> > +
> > + if (tx_pos == (TX_DESC_NUM - 1))
> > + cmd2 |= TXD_EOR;
> > +
> > + txdesc->addr1 = skbinfo->mapping;
> > + txdesc->cmd2 = cmd2;
> > + wmb(); /* Set TXD_OWN after other fields are effective. */
> > + txdesc->cmd1 = cmd1;
> > +
> > + /* Move tx_pos to next position */
> > + tx_pos = ((tx_pos + 1) == TX_DESC_NUM) ? 0 : tx_pos + 1;
> > +
> > + if (unlikely(tx_pos == comm->tx_done_pos)) {
> > + netif_stop_queue(ndev);
> > + comm->tx_desc_full = 1;
> > + }
> > + comm->tx_pos = tx_pos;
> > + wmb(); /* make sure settings are effective. */
> > +
> > + /* Trigger mac to transmit */
> > + writel(MAC_TRIG_L_SOC0, comm->l2sw_reg_base + L2SW_CPU_TX_TRIG);
> > +
> > + spin_unlock_irqrestore(&comm->tx_lock, flags);
> > + return NETDEV_TX_OK;
> > +}
> > +
> > +static void spl2sw_ethernet_set_rx_mode(struct net_device *ndev) {
> > + struct spl2sw_mac *mac = netdev_priv(ndev);
> > +
> > + spl2sw_mac_rx_mode_set(mac);
> > +}
> > +
> > +static int spl2sw_ethernet_set_mac_address(struct net_device *ndev,
> > +void *addr) {
> > + struct spl2sw_mac *mac = netdev_priv(ndev);
> > + int err;
> > +
> > + err = eth_mac_addr(ndev, addr);
> > + if (err)
> > + return err;
> > +
> > + /* Delete the old MAC address */
> > + netdev_dbg(ndev, "Old Ethernet (MAC) address = %pM\n", mac->mac_addr);
> > + if (is_valid_ether_addr(mac->mac_addr)) {
> > + err = spl2sw_mac_addr_del(mac);
> > + if (err)
> > + return err;
> > + }
> > +
> > + /* Set the MAC address */
> > + ether_addr_copy(mac->mac_addr, ndev->dev_addr);
> > + return spl2sw_mac_addr_add(mac);
> > +}
> > +
> > +static void spl2sw_ethernet_tx_timeout(struct net_device *ndev,
> > +unsigned int txqueue) {
> > + struct spl2sw_mac *mac = netdev_priv(ndev);
> > + struct spl2sw_common *comm = mac->comm;
> > + unsigned long flags;
> > + int i;
> > +
> > + netdev_err(ndev, "TX timed out!\n");
> > + ndev->stats.tx_errors++;
> > +
> > + spin_lock_irqsave(&comm->tx_lock, flags);
> > +
> > + for (i = 0; i < MAX_NETDEV_NUM; i++)
> > + if (comm->ndev[i])
> > + netif_stop_queue(comm->ndev[i]);
> > +
> > + spl2sw_mac_soft_reset(comm);
> > +
> > + /* Accept TX packets again. */
> > + for (i = 0; i < MAX_NETDEV_NUM; i++)
> > + if (comm->ndev[i]) {
> > + netif_trans_update(comm->ndev[i]);
> > + netif_wake_queue(comm->ndev[i]);
> > + }
> > +
> > + spin_unlock_irqrestore(&comm->tx_lock, flags); }
> > +
> > +static const struct net_device_ops netdev_ops = {
> > + .ndo_open = spl2sw_ethernet_open,
> > + .ndo_stop = spl2sw_ethernet_stop,
> > + .ndo_start_xmit = spl2sw_ethernet_start_xmit,
> > + .ndo_set_rx_mode = spl2sw_ethernet_set_rx_mode,
> > + .ndo_set_mac_address = spl2sw_ethernet_set_mac_address,
> > + .ndo_do_ioctl = phy_do_ioctl,
> > + .ndo_tx_timeout = spl2sw_ethernet_tx_timeout, };
> > +
> > +static void spl2sw_check_mac_vendor_id_and_convert(u8 *mac_addr) {
> > + u8 tmp;
> > +
> > + /* Byte order of MAC address of some samples are reversed.
> > + * Check vendor id and convert byte order if it is wrong.
> > + * OUI of Sunplus: fc:4b:bc
> > + */
> > + if (mac_addr[5] == 0xfc && mac_addr[4] == 0x4b && mac_addr[3] == 0xbc &&
> > + (mac_addr[0] != 0xfc || mac_addr[1] != 0x4b || mac_addr[2] != 0xbc)) {
> > + /* Swap mac_addr[0] and mac_addr[5] */
> > + tmp = mac_addr[0];
> > + mac_addr[0] = mac_addr[5];
> > + mac_addr[5] = tmp;
> > +
> > + /* Swap mac_addr[1] and mac_addr[4] */
> > + tmp = mac_addr[1];
> > + mac_addr[1] = mac_addr[4];
> > + mac_addr[4] = tmp;
> > +
> > + /* Swap mac_addr[2] and mac_addr[3] */
> > + tmp = mac_addr[2];
> > + mac_addr[2] = mac_addr[3];
> > + mac_addr[3] = tmp;
> > + }
> > +}
> > +
> > +static int spl2sw_nvmem_get_mac_address(struct device *dev, struct device_node *np,
> > + void *addrbuf)
> > +{
> > + struct nvmem_cell *cell;
> > + ssize_t len;
> > + u8 *mac;
> > +
> > + /* Get nvmem cell of mac-address from dts. */
> > + cell = of_nvmem_cell_get(np, "mac-address");
> > + if (IS_ERR(cell))
> > + return PTR_ERR(cell);
> > +
> > + /* Read mac address from nvmem cell. */
> > + mac = nvmem_cell_read(cell, &len);
> > + nvmem_cell_put(cell);
> > + if (IS_ERR(mac))
> > + return PTR_ERR(mac);
> > +
> > + if (len != ETH_ALEN) {
> > + kfree(mac);
> > + dev_info(dev, "Invalid length of mac address in nvmem!\n");
> > + return -EINVAL;
> > + }
> > +
> > + /* Byte order of some samples are reversed.
> > + * Convert byte order here.
> > + */
> > + spl2sw_check_mac_vendor_id_and_convert(mac);
> > +
> > + /* Check if mac address is valid */
> > + if (!is_valid_ether_addr(mac)) {
> > + kfree(mac);
> > + dev_info(dev, "Invalid mac address in nvmem (%pM)!\n", mac);
> > + return -EINVAL;
> > + }
> > +
> > + ether_addr_copy(addrbuf, mac);
> > + kfree(mac);
> > + return 0;
> > +}
> > +
> > +static u32 spl2sw_init_netdev(struct platform_device *pdev, u8 *mac_addr,
> > + struct net_device **r_ndev)
> > +{
> > + struct net_device *ndev;
> > + struct spl2sw_mac *mac;
> > + int ret;
> > +
> > + /* Allocate the devices, and also allocate spl2sw_mac,
> > + * we can get it by netdev_priv().
> > + */
> > + ndev = devm_alloc_etherdev(&pdev->dev, sizeof(*mac));
> > + if (!ndev) {
> > + *r_ndev = NULL;
> > + return -ENOMEM;
> > + }
> > + SET_NETDEV_DEV(ndev, &pdev->dev);
> > + ndev->netdev_ops = &netdev_ops;
> > + mac = netdev_priv(ndev);
> > + mac->ndev = ndev;
> > + ether_addr_copy(mac->mac_addr, mac_addr);
> > +
> > + eth_hw_addr_set(ndev, mac_addr);
> > + dev_info(&pdev->dev, "Ethernet (MAC) address = %pM\n", mac_addr);
> > +
> > + ret = register_netdev(ndev);
> > + if (ret) {
> > + dev_err(&pdev->dev, "Failed to register net device \"%s\"!\n",
> > + ndev->name);
> > + free_netdev(ndev);
> > + *r_ndev = NULL;
> > + return ret;
> > + }
> > + netdev_dbg(ndev, "Registered net device \"%s\" successfully.\n",
> > +ndev->name);
> > +
> > + *r_ndev = ndev;
> > + return 0;
> > +}
> > +
> > +static struct device_node *spl2sw_get_eth_child_node(struct
> > +device_node *ether_np, int id) {
> > + struct device_node *port_np;
> > + int port_id;
> > +
> > + for_each_child_of_node(ether_np, port_np) {
> > + /* It is not a 'port' node, continue. */
> > + if (strcmp(port_np->name, "port"))
> > + continue;
> > +
> > + if (of_property_read_u32(port_np, "reg", &port_id) < 0)
> > + continue;
> > +
> > + if (port_id == id)
> > + return port_np;
> > + }
> > +
> > + /* Not found! */
> > + return NULL;
> > +}
> > +
> > +static int spl2sw_probe(struct platform_device *pdev) {
> > + struct device_node *eth_ports_np;
> > + struct device_node *port_np;
> > + struct spl2sw_common *comm;
> > + struct device_node *phy_np;
> > + phy_interface_t phy_mode;
> > + struct net_device *ndev;
> > + struct spl2sw_mac *mac;
> > + u8 mac_addr[ETH_ALEN];
> > + int irq, i, ret;
> > +
> > + if (platform_get_drvdata(pdev))
> > + return -ENODEV;
> > +
> > + /* Allocate memory for 'spl2sw_common' area. */
> > + comm = devm_kzalloc(&pdev->dev, sizeof(*comm), GFP_KERNEL);
> > + if (!comm)
> > + return -ENOMEM;
> > +
> > + comm->pdev = pdev;
> > + platform_set_drvdata(pdev, comm);
> > +
> > + spin_lock_init(&comm->tx_lock);
> > + spin_lock_init(&comm->mdio_lock);
> > + spin_lock_init(&comm->int_mask_lock);
> > +
> > + /* Get memory resource 0 from dts. */
> > + comm->l2sw_reg_base = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(comm->l2sw_reg_base))
> > + return PTR_ERR(comm->l2sw_reg_base);
> > +
> > + /* Get irq resource from dts. */
> > + ret = platform_get_irq(pdev, 0);
> > + if (ret < 0)
> > + return ret;
> > + irq = ret;
> > +
> > + /* Get clock controller. */
> > + comm->clk = devm_clk_get(&pdev->dev, NULL);
> > + if (IS_ERR(comm->clk)) {
> > + dev_err_probe(&pdev->dev, PTR_ERR(comm->clk),
> > + "Failed to retrieve clock controller!\n");
> > + return PTR_ERR(comm->clk);
> > + }
> > +
> > + /* Get reset controller. */
> > + comm->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
> > + if (IS_ERR(comm->rstc)) {
> > + dev_err_probe(&pdev->dev, PTR_ERR(comm->rstc),
> > + "Failed to retrieve reset controller!\n");
> > + return PTR_ERR(comm->rstc);
> > + }
> > +
> > + /* Enable clock. */
> > + ret = clk_prepare_enable(comm->clk);
> > + if (ret)
> > + return ret;
> > + udelay(1);
> > +
> > + /* Reset MAC */
> > + reset_control_assert(comm->rstc);
> > + udelay(1);
> > + reset_control_deassert(comm->rstc);
> > + usleep_range(1000, 2000);
> > +
> > + /* Request irq. */
> > + ret = devm_request_irq(&pdev->dev, irq, spl2sw_ethernet_interrupt, 0,
> > + dev_name(&pdev->dev), comm);
> > + if (ret) {
> > + dev_err(&pdev->dev, "Failed to request irq #%d!\n", irq);
> > + goto out_clk_disable;
> > + }
> > +
> > + /* Initialize TX and RX descriptors. */
> > + ret = spl2sw_descs_init(comm);
> > + if (ret) {
> > + dev_err(&pdev->dev, "Fail to initialize mac descriptors!\n");
> > + spl2sw_descs_free(comm);
> > + goto out_clk_disable;
> > + }
> > +
> > + /* Initialize MAC. */
> > + spl2sw_mac_init(comm);
> > +
> > + /* Initialize mdio bus */
> > + ret = spl2sw_mdio_init(comm);
> > + if (ret) {
> > + dev_err(&pdev->dev, "Failed to initialize mdio bus!\n");
> > + goto out_clk_disable;
> > + }
> > +
> > + /* Get child node ethernet-ports. */
> > + eth_ports_np = of_get_child_by_name(pdev->dev.of_node, "ethernet-ports");
> > + if (!eth_ports_np) {
> > + dev_err(&pdev->dev, "No ethernet-ports child node found!\n");
> > + ret = -ENODEV;
> > + goto out_free_mdio;
> > + }
> > +
> > + for (i = 0; i < MAX_NETDEV_NUM; i++) {
> > + /* Get port@i of node ethernet-ports. */
> > + port_np = spl2sw_get_eth_child_node(eth_ports_np, i);
> > + if (!port_np)
> > + continue;
> > +
> > + /* Get phy-mode. */
> > + if (of_get_phy_mode(port_np, &phy_mode)) {
> > + dev_err(&pdev->dev, "Failed to get phy-mode property of port@%d!\n",
> > + i);
> > + continue;
> > + }
> > +
> > + /* Get phy-handle. */
> > + phy_np = of_parse_phandle(port_np, "phy-handle", 0);
> > + if (!phy_np) {
> > + dev_err(&pdev->dev, "Failed to get phy-handle property of port@%d!\n",
> > + i);
> > + continue;
> > + }
> > +
> > + /* Get mac-address from nvmem. */
> > + ret = spl2sw_nvmem_get_mac_address(&pdev->dev, port_np, mac_addr);
> > + if (ret == -EPROBE_DEFER) {
> > + goto out_unregister_dev;
> > + } else if (ret) {
> > + dev_info(&pdev->dev, "Generate a random mac address!\n");
> > + eth_random_addr(mac_addr);
> > + }
> > +
> > + /* Initialize the net device. */
> > + ret = spl2sw_init_netdev(pdev, mac_addr, &ndev);
> > + if (ret)
> > + goto out_unregister_dev;
> > +
> > + ndev->irq = irq;
> > + comm->ndev[i] = ndev;
> > + mac = netdev_priv(ndev);
> > + mac->phy_node = phy_np;
> > + mac->phy_mode = phy_mode;
> > + mac->comm = comm;
> > +
> > + mac->lan_port = 0x1 << i; /* forward to port i */
> > + mac->to_vlan = 0x1 << i; /* vlan group: i */
> > + mac->vlan_id = i; /* vlan group: i */
> > +
> > + /* Set MAC address */
> > + ret = spl2sw_mac_addr_add(mac);
> > + if (ret)
> > + goto out_unregister_dev;
> > +
> > + spl2sw_mac_rx_mode_set(mac);
> > + }
> > +
> > + /* Find first valid net device. */
> > + for (i = 0; i < MAX_NETDEV_NUM; i++) {
> > + if (comm->ndev[i])
> > + break;
> > + }
> > + if (i >= MAX_NETDEV_NUM) {
> > + dev_err(&pdev->dev, "No valid ethernet port!\n");
> > + ret = -ENODEV;
> > + goto out_free_mdio;
> > + }
> > +
> > + /* Save first valid net device */
> > + ndev = comm->ndev[i];
> > +
> > + ret = spl2sw_phy_connect(comm);
> > + if (ret) {
> > + netdev_err(ndev, "Failed to connect phy!\n");
> > + goto out_unregister_dev;
> > + }
> > +
> > + /* Add and enable napi. */
> > + netif_napi_add(ndev, &comm->rx_napi, spl2sw_rx_poll, NAPI_POLL_WEIGHT);
> > + napi_enable(&comm->rx_napi);
> > + netif_napi_add(ndev, &comm->tx_napi, spl2sw_tx_poll, NAPI_POLL_WEIGHT);
> > + napi_enable(&comm->tx_napi);
> > + return 0;
> > +
> > +out_unregister_dev:
> > + for (i = 0; i < MAX_NETDEV_NUM; i++)
> > + if (comm->ndev[i])
> > + unregister_netdev(comm->ndev[i]);
> > +
> > +out_free_mdio:
> > + spl2sw_mdio_remove(comm);
> > +
> > +out_clk_disable:
> > + clk_disable_unprepare(comm->clk);
> > + return ret;
> > +}
> > +
> > +static int spl2sw_remove(struct platform_device *pdev) {
> > + struct spl2sw_common *comm;
> > + int i;
> > +
> > + comm = platform_get_drvdata(pdev);
> > +
> > + spl2sw_phy_remove(comm);
> > +
> > + /* Unregister and free net device. */
> > + for (i = 0; i < MAX_NETDEV_NUM; i++)
> > + if (comm->ndev[i])
> > + unregister_netdev(comm->ndev[i]);
> > +
> > + comm->enable = 0;
> > + spl2sw_mac_hw_stop(comm);
> > + spl2sw_descs_free(comm);
> > +
> > + /* Disable and delete napi. */
> > + napi_disable(&comm->rx_napi);
> > + netif_napi_del(&comm->rx_napi);
> > + napi_disable(&comm->tx_napi);
> > + netif_napi_del(&comm->tx_napi);
> > +
> > + spl2sw_mdio_remove(comm);
> > +
> > + clk_disable_unprepare(comm->clk);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id spl2sw_of_match[] = {
> > + {.compatible = "sunplus,sp7021-emac"},
> > + { /* sentinel */ }
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, spl2sw_of_match);
> > +
> > +static struct platform_driver spl2sw_driver = {
> > + .probe = spl2sw_probe,
> > + .remove = spl2sw_remove,
> > + .driver = {
> > + .name = "sp7021_emac",
> > + .owner = THIS_MODULE,
> > + .of_match_table = spl2sw_of_match,
> > + },
> > +};
> > +
> > +module_platform_driver(spl2sw_driver);
> > +
> > +MODULE_AUTHOR("Wells Lu <wellslutw@xxxxxxxxx>");
> > +MODULE_DESCRIPTION("Sunplus Dual 10M/100M Ethernet driver");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/net/ethernet/sunplus/spl2sw_int.c
> > b/drivers/net/ethernet/sunplus/spl2sw_int.c
> > new file mode 100644
> > index 000000000..e8eb30c44
> > --- /dev/null
> > +++ b/drivers/net/ethernet/sunplus/spl2sw_int.c
> > @@ -0,0 +1,273 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/* Copyright Sunplus Technology Co., Ltd.
> > + * All rights reserved.
> > + */
> > +
> > +#include <linux/platform_device.h>
> > +#include <linux/etherdevice.h>
> > +#include <linux/netdevice.h>
> > +#include <linux/bitfield.h>
> > +#include <linux/spinlock.h>
> > +#include <linux/of_mdio.h>
> > +
> > +#include "spl2sw_register.h"
> > +#include "spl2sw_define.h"
> > +#include "spl2sw_int.h"
> > +
> > +int spl2sw_rx_poll(struct napi_struct *napi, int budget) {
> > + struct spl2sw_common *comm = container_of(napi, struct spl2sw_common, rx_napi);
> > + struct spl2sw_mac_desc *desc, *h_desc;
> > + struct net_device_stats *stats;
> > + struct sk_buff *skb, *new_skb;
> > + struct spl2sw_skb_info *sinfo;
> > + int budget_left = budget;
> > + unsigned long flags;
> > + u32 rx_pos, pkg_len;
> > + u32 num, rx_count;
> > + s32 queue;
> > + u32 mask;
> > + int port;
> > + u32 cmd;
> > +
> > + /* Process high-priority queue and then low-priority queue. */
> > + for (queue = 0; queue < RX_DESC_QUEUE_NUM; queue++) {
> > + rx_pos = comm->rx_pos[queue];
> > + rx_count = comm->rx_desc_num[queue];
> > +
> > + for (num = 0; num < rx_count && budget_left; num++) {
> > + sinfo = comm->rx_skb_info[queue] + rx_pos;
> > + desc = comm->rx_desc[queue] + rx_pos;
> > + cmd = desc->cmd1;
> > +
> > + if (cmd & RXD_OWN)
> > + break;
> > +
> > + port = FIELD_GET(RXD_PKT_SP, cmd);
> > + if (port < MAX_NETDEV_NUM && comm->ndev[port])
> > + stats = &comm->ndev[port]->stats;
> > + else
> > + goto spl2sw_rx_poll_rec_err;
> > +
> > + pkg_len = FIELD_GET(RXD_PKT_LEN, cmd);
> > + if (unlikely((cmd & RXD_ERR_CODE) || pkg_len < ETH_ZLEN + 4)) {
> > + stats->rx_length_errors++;
> > + stats->rx_dropped++;
> > + goto spl2sw_rx_poll_rec_err;
> > + }
> > +
> > + dma_unmap_single(&comm->pdev->dev, sinfo->mapping,
> > + comm->rx_desc_buff_size, DMA_FROM_DEVICE);
> > +
> > + skb = sinfo->skb;
> > + skb_put(skb, pkg_len - 4); /* Minus FCS */
> > + skb->ip_summed = CHECKSUM_NONE;
> > + skb->protocol = eth_type_trans(skb, comm->ndev[port]);
> > + netif_receive_skb(skb);
> > +
> > + stats->rx_packets++;
> > + stats->rx_bytes += skb->len;
> > +
> > + /* Allocate a new skb for receiving. */
> > + new_skb = netdev_alloc_skb(NULL, comm->rx_desc_buff_size);
> > + if (unlikely(!new_skb)) {
> > + desc->cmd2 = (rx_pos == comm->rx_desc_num[queue] - 1) ?
> > + RXD_EOR : 0;
> > + sinfo->skb = NULL;
> > + sinfo->mapping = 0;
> > + desc->addr1 = 0;
> > + goto spl2sw_rx_poll_alloc_err;
> > + }
> > +
> > + sinfo->mapping = dma_map_single(&comm->pdev->dev, new_skb->data,
> > + comm->rx_desc_buff_size,
> > + DMA_FROM_DEVICE);
> > + if (dma_mapping_error(&comm->pdev->dev, sinfo->mapping)) {
> > + dev_kfree_skb_irq(new_skb);
> > + desc->cmd2 = (rx_pos == comm->rx_desc_num[queue] - 1) ?
> > + RXD_EOR : 0;
> > + sinfo->skb = NULL;
> > + sinfo->mapping = 0;
> > + desc->addr1 = 0;
> > + goto spl2sw_rx_poll_alloc_err;
> > + }
> > +
> > + sinfo->skb = new_skb;
> > + desc->addr1 = sinfo->mapping;
> > +
> > +spl2sw_rx_poll_rec_err:
> > + desc->cmd2 = (rx_pos == comm->rx_desc_num[queue] - 1) ?
> > + RXD_EOR | comm->rx_desc_buff_size :
> > + comm->rx_desc_buff_size;
> > +
> > + wmb(); /* Set RXD_OWN after other fields are effective. */
> > + desc->cmd1 = RXD_OWN;
> > +
> > +spl2sw_rx_poll_alloc_err:
> > + /* Move rx_pos to next position */
> > + rx_pos = ((rx_pos + 1) == comm->rx_desc_num[queue]) ? 0 : rx_pos +
> > +1;
> > +
> > + budget_left--;
> > +
> > + /* If there are packets in high-priority queue,
> > + * stop processing low-priority queue.
> > + */
> > + if (queue == 1 && !(h_desc->cmd1 & RXD_OWN))
> > + break;
> > + }
> > +
> > + comm->rx_pos[queue] = rx_pos;
> > +
> > + /* Save pointer to last rx descriptor of high-priority queue. */
> > + if (queue == 0)
> > + h_desc = comm->rx_desc[queue] + rx_pos;
> > + }
> > +
> > + wmb(); /* make sure settings are effective. */
>
> It's unclear to me why a memory barrier is needed here. Which writes should be visibile
> before the following? Also the spin lock/unlock pair below implies a full memory barrier.
>
> > + spin_lock_irqsave(&comm->int_mask_lock, flags);
> > + mask = readl(comm->l2sw_reg_base + L2SW_SW_INT_MASK_0);
> > + mask &= ~MAC_INT_RX;
> > + writel(mask, comm->l2sw_reg_base + L2SW_SW_INT_MASK_0);
> > + spin_unlock_irqrestore(&comm->int_mask_lock, flags);
> > +
> > + napi_complete(napi);
> > + return budget - budget_left;
> > +}
> > +
> > +int spl2sw_tx_poll(struct napi_struct *napi, int budget) {
> > + struct spl2sw_common *comm = container_of(napi, struct spl2sw_common, tx_napi);
> > + struct spl2sw_skb_info *skbinfo;
> > + struct net_device_stats *stats;
> > + int budget_left = budget;
> > + unsigned long flags;
> > + u32 tx_done_pos;
> > + u32 mask;
> > + u32 cmd;
> > + int i;
> > +
> > + spin_lock(&comm->tx_lock);
> > +
> > + tx_done_pos = comm->tx_done_pos;
> > + while (((tx_done_pos != comm->tx_pos) || (comm->tx_desc_full == 1)) && budget_left)
> {
> > + cmd = comm->tx_desc[tx_done_pos].cmd1;
> > + if (cmd & TXD_OWN)
> > + break;
> > +
> > + skbinfo = &comm->tx_temp_skb_info[tx_done_pos];
> > + if (unlikely(!skbinfo->skb))
> > + goto spl2sw_tx_poll_next;
> > +
> > + i = ffs(FIELD_GET(TXD_VLAN, cmd)) - 1;
> > + if (i < MAX_NETDEV_NUM && comm->ndev[i])
> > + stats = &comm->ndev[i]->stats;
> > + else
> > + goto spl2sw_tx_poll_unmap;
> > +
> > + if (unlikely(cmd & (TXD_ERR_CODE))) {
> > + stats->tx_errors++;
> > + } else {
> > + stats->tx_packets++;
> > + stats->tx_bytes += skbinfo->len;
> > + }
> > +
> > +spl2sw_tx_poll_unmap:
> > + dma_unmap_single(&comm->pdev->dev, skbinfo->mapping, skbinfo->len,
> > + DMA_TO_DEVICE);
> > + skbinfo->mapping = 0;
> > + dev_kfree_skb_irq(skbinfo->skb);
> > + skbinfo->skb = NULL;
> > +
> > +spl2sw_tx_poll_next:
> > + /* Move tx_done_pos to next position */
> > + tx_done_pos = ((tx_done_pos + 1) == TX_DESC_NUM) ? 0 : tx_done_pos
> > ++ 1;
> > +
> > + if (comm->tx_desc_full == 1)
> > + comm->tx_desc_full = 0;
> > +
> > + budget_left--;
> > + }
> > +
> > + comm->tx_done_pos = tx_done_pos;
> > + if (!comm->tx_desc_full)
> > + for (i = 0; i < MAX_NETDEV_NUM; i++)
> > + if (comm->ndev[i])
> > + if (netif_queue_stopped(comm->ndev[i]))
> > + netif_wake_queue(comm->ndev[i]);
> > +
> > + spin_unlock(&comm->tx_lock);
> > +
> > + wmb(); /* make sure settings are effective. */
>
> Same here.
>
> Thanks,
>
> Paolo

I'll remove the unnecessary memory barriers.

Thank you for your review.

Best regards,
Wells

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