net: broadcom: bcm4908enet: add BCM4908 controller driver

BCM4908 SoCs family uses Ethernel controller that includes UniMAC but
uses different DMA engine (than other controllers) and requires
different programming.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -3445,6 +3445,15 @@ F:	Documentation/devicetree/bindings/mips/brcm/
 F:	arch/mips/bcm47xx/*
 F:	arch/mips/include/asm/mach-bcm47xx/*
 
+BROADCOM BCM4908 ETHERNET DRIVER
+M:	Rafał Miłecki <rafal@milecki.pl>
+M:	bcm-kernel-feedback-list@broadcom.com
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/net/brcm,bcm4908enet.yaml
+F:	drivers/net/ethernet/broadcom/bcm4908enet.*
+F:	drivers/net/ethernet/broadcom/unimac.h
+
 BROADCOM BCM5301X ARM ARCHITECTURE
 M:	Hauke Mehrtens <hauke@hauke-m.de>
 M:	Rafał Miłecki <zajec5@gmail.com>

drivers/net/ethernet/broadcom/Kconfig

@@ -51,6 +51,14 @@ config B44_PCI
 	depends on B44_PCI_AUTOSELECT && B44_PCICORE_AUTOSELECT
 	default y
 
+config BCM4908ENET
+	tristate "Broadcom BCM4908 internal mac support"
+	depends on ARCH_BCM4908 || COMPILE_TEST
+	default y
+	help
+	  This driver supports Ethernet controller integrated into Broadcom
+	  BCM4908 family SoCs.
+
 config BCM63XX_ENET
 	tristate "Broadcom 63xx internal mac support"
 	depends on BCM63XX

drivers/net/ethernet/broadcom/Makefile

@@ -4,6 +4,7 @@
 #
 
 obj-$(CONFIG_B44) += b44.o
+obj-$(CONFIG_BCM4908ENET) += bcm4908enet.o
 obj-$(CONFIG_BCM63XX_ENET) += bcm63xx_enet.o
 obj-$(CONFIG_BCMGENET) += genet/
 obj-$(CONFIG_BNX2) += bnx2.o

drivers/net/ethernet/broadcom/bcm4908enet.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __BCM4908ENET_H
+#define __BCM4908ENET_H
+
+#define ENET_CONTROL					0x000
+#define ENET_MIB_CTRL					0x004
+#define  ENET_MIB_CTRL_CLR_MIB				0x00000001
+#define ENET_RX_ERR_MASK				0x008
+#define ENET_MIB_MAX_PKT_SIZE				0x00C
+#define  ENET_MIB_MAX_PKT_SIZE_VAL			0x00003fff
+#define ENET_DIAG_OUT					0x01c
+#define ENET_ENABLE_DROP_PKT				0x020
+#define ENET_IRQ_ENABLE					0x024
+#define  ENET_IRQ_ENABLE_OVFL				0x00000001
+#define ENET_GMAC_STATUS				0x028
+#define  ENET_GMAC_STATUS_ETH_SPEED_MASK		0x00000003
+#define  ENET_GMAC_STATUS_ETH_SPEED_10			0x00000000
+#define  ENET_GMAC_STATUS_ETH_SPEED_100			0x00000001
+#define  ENET_GMAC_STATUS_ETH_SPEED_1000		0x00000002
+#define  ENET_GMAC_STATUS_HD				0x00000004
+#define  ENET_GMAC_STATUS_AUTO_CFG_EN			0x00000008
+#define  ENET_GMAC_STATUS_LINK_UP			0x00000010
+#define ENET_IRQ_STATUS					0x02c
+#define  ENET_IRQ_STATUS_OVFL				0x00000001
+#define ENET_OVERFLOW_COUNTER				0x030
+#define ENET_FLUSH					0x034
+#define  ENET_FLUSH_RXFIFO_FLUSH			0x00000001
+#define  ENET_FLUSH_TXFIFO_FLUSH			0x00000002
+#define ENET_RSV_SELECT					0x038
+#define ENET_BP_FORCE					0x03c
+#define  ENET_BP_FORCE_FORCE				0x00000001
+#define ENET_DMA_RX_OK_TO_SEND_COUNT			0x040
+#define  ENET_DMA_RX_OK_TO_SEND_COUNT_VAL		0x0000000f
+#define ENET_TX_CRC_CTRL				0x044
+#define ENET_MIB					0x200
+#define ENET_UNIMAC					0x400
+#define ENET_DMA					0x800
+#define ENET_DMA_CONTROLLER_CFG				0x800
+#define  ENET_DMA_CTRL_CFG_MASTER_EN			0x00000001
+#define  ENET_DMA_CTRL_CFG_FLOWC_CH1_EN			0x00000002
+#define  ENET_DMA_CTRL_CFG_FLOWC_CH3_EN			0x00000004
+#define ENET_DMA_FLOWCTL_CH1_THRESH_LO			0x804
+#define ENET_DMA_FLOWCTL_CH1_THRESH_HI			0x808
+#define ENET_DMA_FLOWCTL_CH1_ALLOC			0x80c
+#define  ENET_DMA_FLOWCTL_CH1_ALLOC_FORCE		0x80000000
+#define ENET_DMA_FLOWCTL_CH3_THRESH_LO			0x810
+#define ENET_DMA_FLOWCTL_CH3_THRESH_HI			0x814
+#define ENET_DMA_FLOWCTL_CH3_ALLOC			0x818
+#define ENET_DMA_FLOWCTL_CH5_THRESH_LO			0x81C
+#define ENET_DMA_FLOWCTL_CH5_THRESH_HI			0x820
+#define ENET_DMA_FLOWCTL_CH5_ALLOC			0x824
+#define ENET_DMA_FLOWCTL_CH7_THRESH_LO			0x828
+#define ENET_DMA_FLOWCTL_CH7_THRESH_HI			0x82C
+#define ENET_DMA_FLOWCTL_CH7_ALLOC			0x830
+#define ENET_DMA_CTRL_CHANNEL_RESET			0x834
+#define ENET_DMA_CTRL_CHANNEL_DEBUG			0x838
+#define ENET_DMA_CTRL_GLOBAL_INTERRUPT_STATUS		0x840
+#define ENET_DMA_CTRL_GLOBAL_INTERRUPT_MASK		0x844
+#define ENET_DMA_CH0_CFG				0xa00		/* RX */
+#define ENET_DMA_CH1_CFG				0xa10		/* TX */
+#define ENET_DMA_CH0_STATE_RAM				0xc00		/* RX */
+#define ENET_DMA_CH1_STATE_RAM				0xc10		/* TX */
+
+#define ENET_DMA_CH_CFG					0x00		/* assorted configuration */
+#define  ENET_DMA_CH_CFG_ENABLE				0x00000001	/* set to enable channel */
+#define  ENET_DMA_CH_CFG_PKT_HALT			0x00000002	/* idle after an EOP flag is detected */
+#define  ENET_DMA_CH_CFG_BURST_HALT			0x00000004	/* idle after finish current memory burst */
+#define ENET_DMA_CH_CFG_INT_STAT			0x04		/* interrupts control and status */
+#define ENET_DMA_CH_CFG_INT_MASK			0x08		/* interrupts mask */
+#define  ENET_DMA_CH_CFG_INT_BUFF_DONE			0x00000001	/* buffer done */
+#define  ENET_DMA_CH_CFG_INT_DONE			0x00000002	/* packet xfer complete */
+#define  ENET_DMA_CH_CFG_INT_NO_DESC			0x00000004	/* no valid descriptors */
+#define  ENET_DMA_CH_CFG_INT_RX_ERROR			0x00000008	/* rxdma detect client protocol error */
+#define ENET_DMA_CH_CFG_MAX_BURST			0x0c		/* max burst length permitted */
+#define  ENET_DMA_CH_CFG_MAX_BURST_DESCSIZE_SEL		0x00040000	/* DMA Descriptor Size Selection */
+#define ENET_DMA_CH_CFG_SIZE				0x10
+
+#define ENET_DMA_CH_STATE_RAM_BASE_DESC_PTR		0x00		/* descriptor ring start address */
+#define ENET_DMA_CH_STATE_RAM_STATE_DATA		0x04		/* state/bytes done/ring offset */
+#define ENET_DMA_CH_STATE_RAM_DESC_LEN_STATUS		0x08		/* buffer descriptor status and len */
+#define ENET_DMA_CH_STATE_RAM_DESC_BASE_BUFPTR		0x0c		/* buffer descrpitor current processing */
+#define ENET_DMA_CH_STATE_RAM_SIZE			0x10
+
+#define DMA_CTL_STATUS_APPEND_CRC			0x00000100
+#define DMA_CTL_STATUS_APPEND_BRCM_TAG			0x00000200
+#define DMA_CTL_STATUS_PRIO				0x00000C00  /* Prio for Tx */
+#define DMA_CTL_STATUS_WRAP				0x00001000  /* */
+#define DMA_CTL_STATUS_SOP				0x00002000  /* first buffer in packet */
+#define DMA_CTL_STATUS_EOP				0x00004000  /* last buffer in packet */
+#define DMA_CTL_STATUS_OWN				0x00008000  /* cleared by DMA, set by SW */
+#define DMA_CTL_LEN_DESC_BUFLENGTH			0x0fff0000
+#define DMA_CTL_LEN_DESC_BUFLENGTH_SHIFT		16
+#define DMA_CTL_LEN_DESC_MULTICAST			0x40000000
+#define DMA_CTL_LEN_DESC_USEFPM				0x80000000
+
+#endif