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/*
* drivers/net/ubi32-eth.h
* Ubicom32 ethernet TIO interface driver definitions.
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#ifndef _UBI32_ETH_H
#define _UBI32_ETH_H
#include <asm/devtree.h>
#define UBI32_ETH_NUM_OF_DEVICES 2
/*
* Number of bytes trashed beyond the packet data.
*/
#define UBI32_ETH_TRASHED_MEMORY (CACHE_LINE_SIZE + ETH_HLEN - 1)
/*
* Linux already reserves NET_SKB_PAD bytes of headroom in each sk_buff.
* We want to be able to reserve at least one cache line to align Ethernet
* and IP header to cache line.
* Note that the TIO expects a CACHE_LINE_SIZE - ETH_HLEN aligned Ethernet
* header, while satisfies NET_IP_ALIGN (= 2) automatically.
* (NET_SKB_PAD is 16, NET_IP_ALIGN is 2, CACHE_LINE_SIZE is 32).
* You can add more space by making UBI32_ETH_RESERVE_EXTRA != 0.
*/
#define UBI32_ETH_RESERVE_EXTRA (1 * CACHE_LINE_SIZE)
#define UBI32_ETH_RESERVE_SPACE (UBI32_ETH_RESERVE_EXTRA + CACHE_LINE_SIZE)
struct ubi32_eth_dma_desc {
volatile void *data_pointer; /* pointer to the buffer */
volatile u16 buffer_len; /* the buffer size */
volatile u16 data_len; /* actual frame length */
volatile u32 status; /* bit0: status to be update by VP; bit[31:1] time stamp */
};
#define TX_DMA_RING_SIZE (1<<8)
#define TX_DMA_RING_MASK (TX_DMA_RING_SIZE - 1)
#define RX_DMA_RING_SIZE (1<<8)
#define RX_DMA_RING_MASK (RX_DMA_RING_SIZE - 1)
#define RX_DMA_MAX_QUEUE_SIZE (RX_DMA_RING_SIZE - 1) /* no more than (RX_DMA_RING_SIZE - 1) */
#define RX_MAX_PKT_SIZE (ETH_DATA_LEN + ETH_HLEN + VLAN_HLEN)
#define RX_MIN_PKT_SIZE ETH_ZLEN
#define RX_BUF_SIZE (RX_MAX_PKT_SIZE + VLAN_HLEN) /* allow double VLAN tag */
#define UBI32_ETH_VP_TX_TIMEOUT (10*HZ)
struct ubi32_eth_vp_stats {
u32 rx_alloc_err;
u32 tx_q_full_cnt;
u32 rx_q_full_cnt;
u32 rx_throttle;
};
struct ubi32_eth_private {
struct net_device *dev;
struct ubi32_eth_vp_stats vp_stats;
spinlock_t lock;
#ifdef UBICOM32_USE_NAPI
struct napi_struct napi;
#else
struct tasklet_struct tsk;
#endif
struct ethtionode *regs;
u16 rx_tail;
u16 tx_tail;
u32 vp_int_bit;
};
struct ethtionode {
struct devtree_node dn;
volatile u16 command;
volatile u16 status;
volatile u16 int_mask; /* interrupt mask */
volatile u16 int_status; /* interrupt mask */
volatile u16 tx_in; /* owned by driver */
volatile u16 tx_out; /* owned by vp */
volatile u16 rx_in; /* owned by driver */
volatile u16 rx_out; /* owned by vp */
u16 tx_sz; /* owned by driver */
u16 rx_sz; /* owned by driver */
struct ubi32_eth_dma_desc **tx_dma_ring;
struct ubi32_eth_dma_desc **rx_dma_ring;
};
#define UBI32_ETH_VP_STATUS_LINK (1<<0)
#define UBI32_ETH_VP_STATUS_SPEED100 (0x1<<1)
#define UBI32_ETH_VP_STATUS_SPEED1000 (0x1<<2)
#define UBI32_ETH_VP_STATUS_DUPLEX (0x1<<3)
#define UBI32_ETH_VP_STATUS_FLOW_CTRL (0x1<<4)
#define UBI32_ETH_VP_STATUS_RX_STATE (0x1<<5)
#define UBI32_ETH_VP_STATUS_TX_STATE (0x1<<6)
#define UBI32_ETH_VP_STATUS_TX_Q_FULL (1<<8)
#define UBI32_ETH_VP_INT_RX (1<<0)
#define UBI32_ETH_VP_INT_TX (1<<1)
#define UBI32_ETH_VP_CMD_RX_ENABLE (1<<0)
#define UBI32_ETH_VP_CMD_TX_ENABLE (1<<1)
#define UBI32_ETH_VP_RX_OK (1<<0)
#define UBI32_ETH_VP_TX_OK (1<<1)
#define UBI32_TX_BOUND TX_DMA_RING_SIZE
#define UBI32_RX_BOUND 64
#define UBI32_ETH_NAPI_WEIGHT 64 /* for GigE */
#endif
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