From 9d61d138ab30bbfe4a8609853c81e881c4054a0b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Thu, 11 Feb 2021 13:12:34 +0100 Subject: [PATCH] net: broadcom: rename BCM4908 driver & update DT binding MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit compatible string was updated to match normal naming convention so update driver as well Signed-off-by: Rafał Miłecki Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- MAINTAINERS | 2 +- drivers/net/ethernet/broadcom/Kconfig | 2 +- drivers/net/ethernet/broadcom/Makefile | 2 +- .../{bcm4908enet.c => bcm4908_enet.c} | 215 +++++++++--------- .../{bcm4908enet.h => bcm4908_enet.h} | 4 +- 5 files changed, 113 insertions(+), 112 deletions(-) rename drivers/net/ethernet/broadcom/{bcm4908enet.c => bcm4908_enet.c} (68%) rename drivers/net/ethernet/broadcom/{bcm4908enet.h => bcm4908_enet.h} (98%) --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3433,7 +3433,7 @@ M: bcm-kernel-feedback-list@broadcom.com L: netdev@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/net/brcm,bcm4908-enet.yaml -F: drivers/net/ethernet/broadcom/bcm4908enet.* +F: drivers/net/ethernet/broadcom/bcm4908_enet.* F: drivers/net/ethernet/broadcom/unimac.h BROADCOM BCM5301X ARM ARCHITECTURE --- a/drivers/net/ethernet/broadcom/Kconfig +++ b/drivers/net/ethernet/broadcom/Kconfig @@ -51,7 +51,7 @@ config B44_PCI depends on B44_PCI_AUTOSELECT && B44_PCICORE_AUTOSELECT default y -config BCM4908ENET +config BCM4908_ENET tristate "Broadcom BCM4908 internal mac support" depends on ARCH_BCM4908 || COMPILE_TEST default y --- a/drivers/net/ethernet/broadcom/Makefile +++ b/drivers/net/ethernet/broadcom/Makefile @@ -4,7 +4,7 @@ # obj-$(CONFIG_B44) += b44.o -obj-$(CONFIG_BCM4908ENET) += bcm4908enet.o +obj-$(CONFIG_BCM4908_ENET) += bcm4908_enet.o obj-$(CONFIG_BCM63XX_ENET) += bcm63xx_enet.o obj-$(CONFIG_BCMGENET) += genet/ obj-$(CONFIG_BNX2) += bnx2.o --- a/drivers/net/ethernet/broadcom/bcm4908enet.c +++ /dev/null @@ -1,676 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2021 Rafał Miłecki - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -#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); --- /dev/null +++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c @@ -0,0 +1,677 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021 Rafał Miłecki + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "bcm4908_enet.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 bcm4908_enet_dma_ring_bd { + __le32 ctl; + __le32 addr; +} __packed; + +struct bcm4908_enet_dma_ring_slot { + struct sk_buff *skb; + unsigned int len; + dma_addr_t dma_addr; +}; + +struct bcm4908_enet_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 bcm4908_enet_dma_ring_bd *buf_desc; + }; + dma_addr_t dma_addr; + + struct bcm4908_enet_dma_ring_slot *slots; +}; + +struct bcm4908_enet { + struct device *dev; + struct net_device *netdev; + struct napi_struct napi; + void __iomem *base; + + struct bcm4908_enet_dma_ring tx_ring; + struct bcm4908_enet_dma_ring rx_ring; +}; + +/*** + * R/W ops + */ + +static inline u32 enet_read(struct bcm4908_enet *enet, u16 offset) +{ + return readl(enet->base + offset); +} + +static inline void enet_write(struct bcm4908_enet *enet, u16 offset, u32 value) +{ + writel(value, enet->base + offset); +} + +static inline void enet_maskset(struct bcm4908_enet *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 bcm4908_enet *enet, u16 offset, u32 set) +{ + enet_maskset(enet, offset, set, set); +} + +static inline u32 enet_umac_read(struct bcm4908_enet *enet, u16 offset) +{ + return enet_read(enet, ENET_UNIMAC + offset); +} + +static inline void enet_umac_write(struct bcm4908_enet *enet, u16 offset, u32 value) +{ + enet_write(enet, ENET_UNIMAC + offset, value); +} + +static inline void enet_umac_maskset(struct bcm4908_enet *enet, u16 offset, u32 mask, u32 set) +{ + enet_maskset(enet, ENET_UNIMAC + offset, mask, set); +} + +static inline void enet_umac_set(struct bcm4908_enet *enet, u16 offset, u32 set) +{ + enet_set(enet, ENET_UNIMAC + offset, set); +} + +/*** + * Helpers + */ + +static void bcm4908_enet_intrs_on(struct bcm4908_enet *enet) +{ + enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_MASK, ENET_DMA_INT_DEFAULTS); +} + +static void bcm4908_enet_intrs_off(struct bcm4908_enet *enet) +{ + enet_write(enet, ENET_DMA_CH_RX_CFG + ENET_DMA_CH_CFG_INT_MASK, 0); +} + +static void bcm4908_enet_intrs_ack(struct bcm4908_enet *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 bcm4908_enet *enet, + struct bcm4908_enet_dma_ring *ring) +{ + int size = ring->length * sizeof(struct bcm4908_enet_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 bcm4908_enet_dma_free(struct bcm4908_enet *enet) +{ + struct bcm4908_enet_dma_ring *tx_ring = &enet->tx_ring; + struct bcm4908_enet_dma_ring *rx_ring = &enet->rx_ring; + struct device *dev = enet->dev; + int size; + + size = rx_ring->length * sizeof(struct bcm4908_enet_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 bcm4908_enet_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 bcm4908_enet_dma_alloc(struct bcm4908_enet *enet) +{ + struct bcm4908_enet_dma_ring *tx_ring = &enet->tx_ring; + struct bcm4908_enet_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); + bcm4908_enet_dma_free(enet); + return err; + } + + return 0; +} + +static void bcm4908_enet_dma_reset(struct bcm4908_enet *enet) +{ + struct bcm4908_enet_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 bcm4908_enet_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 bcm4908_enet_dma_alloc_rx_buf(struct bcm4908_enet *enet, unsigned int idx) +{ + struct bcm4908_enet_dma_ring_bd *buf_desc = &enet->rx_ring.buf_desc[idx]; + struct bcm4908_enet_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 bcm4908_enet_dma_ring_init(struct bcm4908_enet *enet, + struct bcm4908_enet_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 bcm4908_enet_dma_uninit(struct bcm4908_enet *enet) +{ + struct bcm4908_enet_dma_ring *rx_ring = &enet->rx_ring; + struct bcm4908_enet_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 bcm4908_enet_dma_init(struct bcm4908_enet *enet) +{ + struct bcm4908_enet_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 = bcm4908_enet_dma_alloc_rx_buf(enet, i); + if (err) { + dev_err(dev, "Failed to alloc RX buffer: %d\n", err); + bcm4908_enet_dma_uninit(enet); + return err; + } + } + + bcm4908_enet_dma_ring_init(enet, &enet->tx_ring); + bcm4908_enet_dma_ring_init(enet, &enet->rx_ring); + + return 0; +} + +static void bcm4908_enet_dma_tx_ring_ensable(struct bcm4908_enet *enet, + struct bcm4908_enet_dma_ring *ring) +{ + enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG, ENET_DMA_CH_CFG_ENABLE); +} + +static void bcm4908_enet_dma_tx_ring_disable(struct bcm4908_enet *enet, + struct bcm4908_enet_dma_ring *ring) +{ + enet_write(enet, ring->cfg_block + ENET_DMA_CH_CFG, 0); +} + +static void bcm4908_enet_dma_rx_ring_enable(struct bcm4908_enet *enet, + struct bcm4908_enet_dma_ring *ring) +{ + enet_set(enet, ring->cfg_block + ENET_DMA_CH_CFG, ENET_DMA_CH_CFG_ENABLE); +} + +static void bcm4908_enet_dma_rx_ring_disable(struct bcm4908_enet *enet, + struct bcm4908_enet_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 bcm4908_enet_gmac_init(struct bcm4908_enet *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 bcm4908_enet_irq_handler(int irq, void *dev_id) +{ + struct bcm4908_enet *enet = dev_id; + + bcm4908_enet_intrs_off(enet); + bcm4908_enet_intrs_ack(enet); + + napi_schedule(&enet->napi); + + return IRQ_HANDLED; +} + +static int bcm4908_enet_open(struct net_device *netdev) +{ + struct bcm4908_enet *enet = netdev_priv(netdev); + struct device *dev = enet->dev; + int err; + + err = request_irq(netdev->irq, bcm4908_enet_irq_handler, 0, "enet", enet); + if (err) { + dev_err(dev, "Failed to request IRQ %d: %d\n", netdev->irq, err); + return err; + } + + bcm4908_enet_gmac_init(enet); + bcm4908_enet_dma_reset(enet); + bcm4908_enet_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); + bcm4908_enet_dma_rx_ring_enable(enet, &enet->rx_ring); + + napi_enable(&enet->napi); + netif_carrier_on(netdev); + netif_start_queue(netdev); + + bcm4908_enet_intrs_ack(enet); + bcm4908_enet_intrs_on(enet); + + return 0; +} + +static int bcm4908_enet_stop(struct net_device *netdev) +{ + struct bcm4908_enet *enet = netdev_priv(netdev); + + netif_stop_queue(netdev); + netif_carrier_off(netdev); + napi_disable(&enet->napi); + + bcm4908_enet_dma_rx_ring_disable(enet, &enet->rx_ring); + bcm4908_enet_dma_tx_ring_disable(enet, &enet->tx_ring); + + bcm4908_enet_dma_uninit(enet); + + free_irq(enet->netdev->irq, enet); + + return 0; +} + +static int bcm4908_enet_start_xmit(struct sk_buff *skb, struct net_device *netdev) +{ + struct bcm4908_enet *enet = netdev_priv(netdev); + struct bcm4908_enet_dma_ring *ring = &enet->tx_ring; + struct bcm4908_enet_dma_ring_slot *slot; + struct device *dev = enet->dev; + struct bcm4908_enet_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); + + bcm4908_enet_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 bcm4908_enet_poll(struct napi_struct *napi, int weight) +{ + struct bcm4908_enet *enet = container_of(napi, struct bcm4908_enet, napi); + struct device *dev = enet->dev; + int handled = 0; + + while (handled < weight) { + struct bcm4908_enet_dma_ring_bd *buf_desc; + struct bcm4908_enet_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 = bcm4908_enet_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); + bcm4908_enet_intrs_on(enet); + } + + return handled; +} + +static const struct net_device_ops bcm96xx_netdev_ops = { + .ndo_open = bcm4908_enet_open, + .ndo_stop = bcm4908_enet_stop, + .ndo_start_xmit = bcm4908_enet_start_xmit, + .ndo_set_mac_address = eth_mac_addr, +}; + +static int bcm4908_enet_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct net_device *netdev; + struct bcm4908_enet *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 = bcm4908_enet_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, bcm4908_enet_poll, 64); + + err = register_netdev(netdev); + if (err) { + bcm4908_enet_dma_free(enet); + return err; + } + + platform_set_drvdata(pdev, enet); + + return 0; +} + +static int bcm4908_enet_remove(struct platform_device *pdev) +{ + struct bcm4908_enet *enet = platform_get_drvdata(pdev); + + unregister_netdev(enet->netdev); + netif_napi_del(&enet->napi); + bcm4908_enet_dma_free(enet); + + return 0; +} + +static const struct of_device_id bcm4908_enet_of_match[] = { + { .compatible = "brcm,bcm4908-enet"}, + {}, +}; + +static struct platform_driver bcm4908_enet_driver = { + .driver = { + .name = "bcm4908_enet", + .of_match_table = bcm4908_enet_of_match, + }, + .probe = bcm4908_enet_probe, + .remove = bcm4908_enet_remove, +}; +module_platform_driver(bcm4908_enet_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DEVICE_TABLE(of, bcm4908_enet_of_match); --- a/drivers/net/ethernet/broadcom/bcm4908enet.h +++ /dev/null @@ -1,96 +0,0 @@ -/* 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 --- /dev/null +++ b/drivers/net/ethernet/broadcom/bcm4908_enet.h @@ -0,0 +1,96 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __BCM4908_ENET_H +#define __BCM4908_ENET_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