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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>
master
Rafał Miłecki 2021-02-07 23:26:32 +01:00 committed by David S. Miller
parent 387d1c1819
commit 4feffeadbc
5 changed files with 790 additions and 0 deletions
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9
MAINTAINERS
View File

@ -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>

8
drivers/net/ethernet/broadcom/Kconfig
View File

@ -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

1
drivers/net/ethernet/broadcom/Makefile
View File

@ -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

676
drivers/net/ethernet/broadcom/bcm4908enet.c 100644
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@ -0,0 +1,676 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
*/
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "bcm4908enet.h"
#include "unimac.h"
#define ENET_DMA_CH_RX_CFG ENET_DMA_CH0_CFG
#define ENET_DMA_CH_TX_CFG ENET_DMA_CH1_CFG
#define ENET_DMA_CH_RX_STATE_RAM ENET_DMA_CH0_STATE_RAM
#define ENET_DMA_CH_TX_STATE_RAM ENET_DMA_CH1_STATE_RAM
#define ENET_TX_BDS_NUM 200
#define ENET_RX_BDS_NUM 200
#define ENET_RX_BDS_NUM_MAX 8192
#define ENET_DMA_INT_DEFAULTS (ENET_DMA_CH_CFG_INT_DONE | \
ENET_DMA_CH_CFG_INT_NO_DESC | \
ENET_DMA_CH_CFG_INT_BUFF_DONE)
#define ENET_DMA_MAX_BURST_LEN 8 /* in 64 bit words */
#define ENET_MTU_MIN 60
#define ENET_MTU_MAX 1500 /* Is it possible to support 2044? */
#define ENET_MTU_MAX_EXTRA_SIZE 32 /* L2 */
struct bcm4908enet_dma_ring_bd {
__le32 ctl;
__le32 addr;
} __packed;
struct bcm4908enet_dma_ring_slot {
struct sk_buff *skb;
unsigned int len;
dma_addr_t dma_addr;
};
struct bcm4908enet_dma_ring {
int is_tx;
int read_idx;
int write_idx;
int length;
u16 cfg_block;
u16 st_ram_block;
union {
void *cpu_addr;
struct bcm4908enet_dma_ring_bd *buf_desc;
};
dma_addr_t dma_addr;
struct bcm4908enet_dma_ring_slot *slots;
};
struct bcm4908enet {
struct device *dev;
struct net_device *netdev;
struct napi_struct napi;
void __iomem *base;
struct bcm4908enet_dma_ring tx_ring;
struct bcm4908enet_dma_ring rx_ring;
};
/***
* R/W ops
*/
static inline u32 enet_read(struct bcm4908enet *enet, u16 offset)
{
return readl(enet->base + offset);
}
static inline void enet_write(struct bcm4908enet *enet, u16 offset, u32 value)
{
writel(value, enet->base + offset);
}
static inline void enet_maskset(struct bcm4908enet *enet, u16 offset, u32 mask, u32 set)
{
u32 val;
WARN_ON(set & ~mask);
val = enet_read(enet, offset);
val = (val & ~mask) | (set & mask);
enet_write(enet, offset, val);
}
static inline void enet_set(struct bcm4908enet *enet, u16 offset, u32 set)
{
enet_maskset(enet, offset, set, set);
}
static inline u32 enet_umac_read(struct bcm4908enet *enet, u16 offset)
{
return enet_read(enet, ENET_UNIMAC + offset);
}
static inline void enet_umac_write(struct bcm4908enet *enet, u16 offset, u32 value)
{
enet_write(enet, ENET_UNIMAC + offset, value);
}
static inline void enet_umac_maskset(struct bcm4908enet *enet, u16 offset, u32 mask, u32 set)
{
enet_maskset(enet, ENET_UNIMAC + offset, mask, set);
}
static inline void enet_umac_set(struct bcm4908enet *enet, u16 offset, u32 set)
{
enet_set(enet, ENET_UNIMAC + offset, set);
}
/***
* Helpers
*/
static void bcm4908enet_intrs_on(struct bcm4908enet *enet)
{
enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_MASK, ENET_DMA_INT_DEFAULTS);
}
static void bcm4908enet_intrs_off(struct bcm4908enet *enet)
{
enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_MASK, 0);
}
static void bcm4908enet_intrs_ack(struct bcm4908enet *enet)
{
enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_STAT, ENET_DMA_INT_DEFAULTS);
}
/***
* DMA
*/
static int bcm4908_dma_alloc_buf_descs(struct bcm4908enet *enet, struct bcm4908enet_dma_ring *ring)
{
int size = ring->length * sizeof(struct bcm4908enet_dma_ring_bd);
struct device *dev = enet->dev;
ring->cpu_addr = dma_alloc_coherent(dev, size, &ring->dma_addr, GFP_KERNEL);
if (!ring->cpu_addr)
return -ENOMEM;
if (((uintptr_t)ring->cpu_addr) & (0x40 - 1)) {
dev_err(dev, "Invalid DMA ring alignment\n");
goto err_free_buf_descs;
}
ring->slots = kzalloc(ring->length * sizeof(*ring->slots), GFP_KERNEL);
if (!ring->slots)
goto err_free_buf_descs;
memset(ring->cpu_addr, 0, size);
ring->read_idx = 0;
ring->write_idx = 0;
return 0;
err_free_buf_descs:
dma_free_coherent(dev, size, ring->cpu_addr, ring->dma_addr);
return -ENOMEM;
}
static void bcm4908enet_dma_free(struct bcm4908enet *enet)
{
struct bcm4908enet_dma_ring *tx_ring = &enet->tx_ring;
struct bcm4908enet_dma_ring *rx_ring = &enet->rx_ring;
struct device *dev = enet->dev;
int size;
size = rx_ring->length * sizeof(struct bcm4908enet_dma_ring_bd);
if (rx_ring->cpu_addr)
dma_free_coherent(dev, size, rx_ring->cpu_addr, rx_ring->dma_addr);
kfree(rx_ring->slots);
size = tx_ring->length * sizeof(struct bcm4908enet_dma_ring_bd);
if (tx_ring->cpu_addr)
dma_free_coherent(dev, size, tx_ring->cpu_addr, tx_ring->dma_addr);
kfree(tx_ring->slots);
}
static int bcm4908enet_dma_alloc(struct bcm4908enet *enet)
{
struct bcm4908enet_dma_ring *tx_ring = &enet->tx_ring;
struct bcm4908enet_dma_ring *rx_ring = &enet->rx_ring;
struct device *dev = enet->dev;
int err;
tx_ring->length = ENET_TX_BDS_NUM;
tx_ring->is_tx = 1;
tx_ring->cfg_block = ENET_DMA_CH_TX_CFG;
tx_ring->st_ram_block = ENET_DMA_CH_TX_STATE_RAM;
err = bcm4908_dma_alloc_buf_descs(enet, tx_ring);
if (err) {
dev_err(dev, "Failed to alloc TX buf descriptors: %d\n", err);
return err;
}
rx_ring->length = ENET_RX_BDS_NUM;
rx_ring->is_tx = 0;
rx_ring->cfg_block = ENET_DMA_CH_RX_CFG;
rx_ring->st_ram_block = ENET_DMA_CH_RX_STATE_RAM;
err = bcm4908_dma_alloc_buf_descs(enet, rx_ring);
if (err) {
dev_err(dev, "Failed to alloc RX buf descriptors: %d\n", err);
bcm4908enet_dma_free(enet);
return err;
}
return 0;
}
static void bcm4908enet_dma_reset(struct bcm4908enet *enet)
{
struct bcm4908enet_dma_ring *rings[] = { &enet->rx_ring, &enet->tx_ring };
int i;
/* Disable the DMA controller and channel */
for (i = 0; i < ARRAY_SIZE(rings); i++)
enet_write(enet, rings[i]->cfg_block + ENET_DMA_CH_CFG, 0);
enet_maskset(enet, ENET_DMA_CONTROLLER_CFG, ENET_DMA_CTRL_CFG_MASTER_EN, 0);
/* Reset channels state */
for (i = 0; i < ARRAY_SIZE(rings); i++) {
struct bcm4908enet_dma_ring *ring = rings[i];
enet_write(enet, ring->st_ram_block + ENET_DMA_CH_STATE_RAM_BASE_DESC_PTR, 0);
enet_write(enet, ring->st_ram_block + ENET_DMA_CH_STATE_RAM_STATE_DATA, 0);
enet_write(enet, ring->st_ram_block + ENET_DMA_CH_STATE_RAM_DESC_LEN_STATUS, 0);
enet_write(enet, ring->st_ram_block + ENET_DMA_CH_STATE_RAM_DESC_BASE_BUFPTR, 0);
}
}
static int bcm4908enet_dma_alloc_rx_buf(struct bcm4908enet *enet, unsigned int idx)
{
struct bcm4908enet_dma_ring_bd *buf_desc = &enet->rx_ring.buf_desc[idx];
struct bcm4908enet_dma_ring_slot *slot = &enet->rx_ring.slots[idx];
struct device *dev = enet->dev;
u32 tmp;
int err;
slot->len = ENET_MTU_MAX + ENET_MTU_MAX_EXTRA_SIZE;
slot->skb = netdev_alloc_skb(enet->netdev, slot->len);
if (!slot->skb)
return -ENOMEM;
slot->dma_addr = dma_map_single(dev, slot->skb->data, slot->len, DMA_FROM_DEVICE);
err = dma_mapping_error(dev, slot->dma_addr);
if (err) {
dev_err(dev, "Failed to map DMA buffer: %d\n", err);
kfree_skb(slot->skb);
slot->skb = NULL;
return err;
}
tmp = slot->len << DMA_CTL_LEN_DESC_BUFLENGTH_SHIFT;
tmp |= DMA_CTL_STATUS_OWN;
if (idx == enet->rx_ring.length - 1)
tmp |= DMA_CTL_STATUS_WRAP;
buf_desc->ctl = cpu_to_le32(tmp);
buf_desc->addr = cpu_to_le32(slot->dma_addr);
return 0;
}
static void bcm4908enet_dma_ring_init(struct bcm4908enet *enet,
struct bcm4908enet_dma_ring *ring)
{
int reset_channel = 0; /* We support only 1 main channel (with TX and RX) */
int reset_subch = ring->is_tx ? 1 : 0;
/* Reset the DMA channel */
enet_write(enet, ENET_DMA_CTRL_CHANNEL_RESET, BIT(reset_channel * 2 + reset_subch));
enet_write(enet, ENET_DMA_CTRL_CHANNEL_RESET, 0);
enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG, 0);
enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG_MAX_BURST, ENET_DMA_MAX_BURST_LEN);
enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG_INT_MASK, 0);
enet_write(enet, ring->st_ram_block + ENET_DMA_CH_STATE_RAM_BASE_DESC_PTR,
(uint32_t)ring->dma_addr);
}
static void bcm4908enet_dma_uninit(struct bcm4908enet *enet)
{
struct bcm4908enet_dma_ring *rx_ring = &enet->rx_ring;
struct bcm4908enet_dma_ring_slot *slot;
struct device *dev = enet->dev;
int i;
for (i = rx_ring->length - 1; i >= 0; i--) {
slot = &rx_ring->slots[i];
if (!slot->skb)
continue;
dma_unmap_single(dev, slot->dma_addr, slot->len, DMA_FROM_DEVICE);
kfree_skb(slot->skb);
slot->skb = NULL;
}
}
static int bcm4908enet_dma_init(struct bcm4908enet *enet)
{
struct bcm4908enet_dma_ring *rx_ring = &enet->rx_ring;
struct device *dev = enet->dev;
int err;
int i;
for (i = 0; i < rx_ring->length; i++) {
err = bcm4908enet_dma_alloc_rx_buf(enet, i);
if (err) {
dev_err(dev, "Failed to alloc RX buffer: %d\n", err);
bcm4908enet_dma_uninit(enet);
return err;
}
}
bcm4908enet_dma_ring_init(enet, &enet->tx_ring);
bcm4908enet_dma_ring_init(enet, &enet->rx_ring);
return 0;
}
static void bcm4908enet_dma_tx_ring_ensable(struct bcm4908enet *enet,
struct bcm4908enet_dma_ring *ring)
{
enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG, ENET_DMA_CH_CFG_ENABLE);
}
static void bcm4908enet_dma_tx_ring_disable(struct bcm4908enet *enet,
struct bcm4908enet_dma_ring *ring)
{
enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG, 0);
}
static void bcm4908enet_dma_rx_ring_enable(struct bcm4908enet *enet,
struct bcm4908enet_dma_ring *ring)
{
enet_set(enet, ring->cfg_block + ENET_DMA_CH_CFG, ENET_DMA_CH_CFG_ENABLE);
}
static void bcm4908enet_dma_rx_ring_disable(struct bcm4908enet *enet,
struct bcm4908enet_dma_ring *ring)
{
unsigned long deadline;
u32 tmp;
enet_maskset(enet, ring->cfg_block + ENET_DMA_CH_CFG, ENET_DMA_CH_CFG_ENABLE, 0);
deadline = jiffies + usecs_to_jiffies(2000);
do {
tmp = enet_read(enet, ring->cfg_block + ENET_DMA_CH_CFG);
if (!(tmp & ENET_DMA_CH_CFG_ENABLE))
return;
enet_maskset(enet, ring->cfg_block + ENET_DMA_CH_CFG, ENET_DMA_CH_CFG_ENABLE, 0);
usleep_range(10, 30);
} while (!time_after_eq(jiffies, deadline));
dev_warn(enet->dev, "Timeout waiting for DMA TX stop\n");
}
/***
* Ethernet driver
*/
static void bcm4908enet_gmac_init(struct bcm4908enet *enet)
{
u32 cmd;
cmd = enet_umac_read(enet, UMAC_CMD);
enet_umac_write(enet, UMAC_CMD, cmd | CMD_SW_RESET);
enet_umac_write(enet, UMAC_CMD, cmd & ~CMD_SW_RESET);
enet_set(enet, ENET_FLUSH, ENET_FLUSH_RXFIFO_FLUSH | ENET_FLUSH_TXFIFO_FLUSH);
enet_maskset(enet, ENET_FLUSH, ENET_FLUSH_RXFIFO_FLUSH | ENET_FLUSH_TXFIFO_FLUSH, 0);
enet_set(enet, ENET_MIB_CTRL, ENET_MIB_CTRL_CLR_MIB);
enet_maskset(enet, ENET_MIB_CTRL, ENET_MIB_CTRL_CLR_MIB, 0);
cmd = enet_umac_read(enet, UMAC_CMD);
cmd &= ~(CMD_SPEED_MASK << CMD_SPEED_SHIFT);
cmd &= ~CMD_TX_EN;
cmd &= ~CMD_RX_EN;
cmd |= CMD_SPEED_1000 << CMD_SPEED_SHIFT;
enet_umac_write(enet, UMAC_CMD, cmd);
enet_maskset(enet, ENET_GMAC_STATUS,
ENET_GMAC_STATUS_ETH_SPEED_MASK |
ENET_GMAC_STATUS_HD |
ENET_GMAC_STATUS_AUTO_CFG_EN |
ENET_GMAC_STATUS_LINK_UP,
ENET_GMAC_STATUS_ETH_SPEED_1000 |
ENET_GMAC_STATUS_AUTO_CFG_EN |
ENET_GMAC_STATUS_LINK_UP);
}
static irqreturn_t bcm4908enet_irq_handler(int irq, void *dev_id)
{
struct bcm4908enet *enet = dev_id;
bcm4908enet_intrs_off(enet);
bcm4908enet_intrs_ack(enet);
napi_schedule(&enet->napi);
return IRQ_HANDLED;
}
static int bcm4908enet_open(struct net_device *netdev)
{
struct bcm4908enet *enet = netdev_priv(netdev);
struct device *dev = enet->dev;
int err;
err = request_irq(netdev->irq, bcm4908enet_irq_handler, 0, "enet", enet);
if (err) {
dev_err(dev, "Failed to request IRQ %d: %d\n", netdev->irq, err);
return err;
}
bcm4908enet_gmac_init(enet);
bcm4908enet_dma_reset(enet);
bcm4908enet_dma_init(enet);
enet_umac_set(enet, UMAC_CMD, CMD_TX_EN | CMD_RX_EN);
enet_set(enet, ENET_DMA_CONTROLLER_CFG, ENET_DMA_CTRL_CFG_MASTER_EN);
enet_maskset(enet, ENET_DMA_CONTROLLER_CFG, ENET_DMA_CTRL_CFG_FLOWC_CH1_EN, 0);
bcm4908enet_dma_rx_ring_enable(enet, &enet->rx_ring);
napi_enable(&enet->napi);
netif_carrier_on(netdev);
netif_start_queue(netdev);
bcm4908enet_intrs_ack(enet);
bcm4908enet_intrs_on(enet);
return 0;
}
static int bcm4908enet_stop(struct net_device *netdev)
{
struct bcm4908enet *enet = netdev_priv(netdev);
netif_stop_queue(netdev);
netif_carrier_off(netdev);
napi_disable(&enet->napi);
bcm4908enet_dma_rx_ring_disable(enet, &enet->rx_ring);
bcm4908enet_dma_tx_ring_disable(enet, &enet->tx_ring);
bcm4908enet_dma_uninit(enet);
free_irq(enet->netdev->irq, enet);
return 0;
}
static int bcm4908enet_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct bcm4908enet *enet = netdev_priv(netdev);
struct bcm4908enet_dma_ring *ring = &enet->tx_ring;
struct bcm4908enet_dma_ring_slot *slot;
struct device *dev = enet->dev;
struct bcm4908enet_dma_ring_bd *buf_desc;
int free_buf_descs;
u32 tmp;
/* Free transmitted skbs */
while (ring->read_idx != ring->write_idx) {
buf_desc = &ring->buf_desc[ring->read_idx];
if (buf_desc->ctl & DMA_CTL_STATUS_OWN)
break;
slot = &ring->slots[ring->read_idx];
dma_unmap_single(dev, slot->dma_addr, slot->len, DMA_TO_DEVICE);
dev_kfree_skb(slot->skb);
if (++ring->read_idx == ring->length)
ring->read_idx = 0;
}
/* Don't use the last empty buf descriptor */
if (ring->read_idx <= ring->write_idx)
free_buf_descs = ring->read_idx - ring->write_idx + ring->length;
else
free_buf_descs = ring->read_idx - ring->write_idx;
if (free_buf_descs < 2)
return NETDEV_TX_BUSY;
/* Hardware removes OWN bit after sending data */
buf_desc = &ring->buf_desc[ring->write_idx];
if (unlikely(le32_to_cpu(buf_desc->ctl) & DMA_CTL_STATUS_OWN)) {
netif_stop_queue(netdev);
return NETDEV_TX_BUSY;
}
slot = &ring->slots[ring->write_idx];
slot->skb = skb;
slot->len = skb->len;
slot->dma_addr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(dev, slot->dma_addr)))
return NETDEV_TX_BUSY;
tmp = skb->len << DMA_CTL_LEN_DESC_BUFLENGTH_SHIFT;
tmp |= DMA_CTL_STATUS_OWN;
tmp |= DMA_CTL_STATUS_SOP;
tmp |= DMA_CTL_STATUS_EOP;
tmp |= DMA_CTL_STATUS_APPEND_CRC;
if (ring->write_idx + 1 == ring->length - 1)
tmp |= DMA_CTL_STATUS_WRAP;
buf_desc->addr = cpu_to_le32((uint32_t)slot->dma_addr);
buf_desc->ctl = cpu_to_le32(tmp);
bcm4908enet_dma_tx_ring_ensable(enet, &enet->tx_ring);
if (++ring->write_idx == ring->length - 1)
ring->write_idx = 0;
enet->netdev->stats.tx_bytes += skb->len;
enet->netdev->stats.tx_packets++;
return NETDEV_TX_OK;
}
static int bcm4908enet_poll(struct napi_struct *napi, int weight)
{
struct bcm4908enet *enet = container_of(napi, struct bcm4908enet, napi);
struct device *dev = enet->dev;
int handled = 0;
while (handled < weight) {
struct bcm4908enet_dma_ring_bd *buf_desc;
struct bcm4908enet_dma_ring_slot slot;
u32 ctl;
int len;
int err;
buf_desc = &enet->rx_ring.buf_desc[enet->rx_ring.read_idx];
ctl = le32_to_cpu(buf_desc->ctl);
if (ctl & DMA_CTL_STATUS_OWN)
break;
slot = enet->rx_ring.slots[enet->rx_ring.read_idx];
/* Provide new buffer before unpinning the old one */
err = bcm4908enet_dma_alloc_rx_buf(enet, enet->rx_ring.read_idx);
if (err)
break;
if (++enet->rx_ring.read_idx == enet->rx_ring.length)
enet->rx_ring.read_idx = 0;
len = (ctl & DMA_CTL_LEN_DESC_BUFLENGTH) >> DMA_CTL_LEN_DESC_BUFLENGTH_SHIFT;
if (len < ENET_MTU_MIN ||
(ctl & (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) != (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) {
enet->netdev->stats.rx_dropped++;
break;
}
dma_unmap_single(dev, slot.dma_addr, slot.len, DMA_FROM_DEVICE);
skb_put(slot.skb, len - 4 + 2);
slot.skb->protocol = eth_type_trans(slot.skb, enet->netdev);
netif_receive_skb(slot.skb);
enet->netdev->stats.rx_packets++;
enet->netdev->stats.rx_bytes += len;
}
if (handled < weight) {
napi_complete_done(napi, handled);
bcm4908enet_intrs_on(enet);
}
return handled;
}
static const struct net_device_ops bcm96xx_netdev_ops = {
.ndo_open = bcm4908enet_open,
.ndo_stop = bcm4908enet_stop,
.ndo_start_xmit = bcm4908enet_start_xmit,
.ndo_set_mac_address = eth_mac_addr,
};
static int bcm4908enet_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct net_device *netdev;
struct bcm4908enet *enet;
int err;
netdev = devm_alloc_etherdev(dev, sizeof(*enet));
if (!netdev)
return -ENOMEM;
enet = netdev_priv(netdev);
enet->dev = dev;
enet->netdev = netdev;
enet->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(enet->base)) {
dev_err(dev, "Failed to map registers: %ld\n", PTR_ERR(enet->base));
return PTR_ERR(enet->base);
}
netdev->irq = platform_get_irq_byname(pdev, "rx");
if (netdev->irq < 0)
return netdev->irq;
dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
err = bcm4908enet_dma_alloc(enet);
if (err)
return err;
SET_NETDEV_DEV(netdev, &pdev->dev);
eth_hw_addr_random(netdev);
netdev->netdev_ops = &bcm96xx_netdev_ops;
netdev->min_mtu = ETH_ZLEN;
netdev->mtu = ENET_MTU_MAX;
netdev->max_mtu = ENET_MTU_MAX;
netif_napi_add(netdev, &enet->napi, bcm4908enet_poll, 64);
err = register_netdev(netdev);
if (err) {
bcm4908enet_dma_free(enet);
return err;
}
platform_set_drvdata(pdev, enet);
return 0;
}
static int bcm4908enet_remove(struct platform_device *pdev)
{
struct bcm4908enet *enet = platform_get_drvdata(pdev);
unregister_netdev(enet->netdev);
netif_napi_del(&enet->napi);
bcm4908enet_dma_free(enet);
return 0;
}
static const struct of_device_id bcm4908enet_of_match[] = {
{ .compatible = "brcm,bcm4908enet"},
{},
};
static struct platform_driver bcm4908enet_driver = {
.driver = {
.name = "bcm4908enet",
.of_match_table = bcm4908enet_of_match,
},
.probe = bcm4908enet_probe,
.remove = bcm4908enet_remove,
};
module_platform_driver(bcm4908enet_driver);
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, bcm4908enet_of_match);

96
drivers/net/ethernet/broadcom/bcm4908enet.h 100644
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@ -0,0 +1,96 @@
/* 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