![Eric Dumazet](/assets/img/avatar_default.png)
Now that core network takes care of trans_start updates, dont do it in drivers themselves, if possible. Drivers can avoid one cache miss (on dev->trans_start) in their start_xmit() handler. Exceptions are NETIF_F_LLTX drivers Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1752 lines
45 KiB
C
1752 lines
45 KiB
C
/*
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* Micrel KS8695 (Centaur) Ethernet.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* Copyright 2008 Simtec Electronics
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* Daniel Silverstone <dsilvers@simtec.co.uk>
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* Vincent Sanders <vince@simtec.co.uk>
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*/
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/crc32.h>
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#include <linux/mii.h>
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#include <linux/ethtool.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <asm/irq.h>
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#include <mach/regs-switch.h>
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#include <mach/regs-misc.h>
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#include <asm/mach/irq.h>
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#include <mach/regs-irq.h>
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#include "ks8695net.h"
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#define MODULENAME "ks8695_ether"
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#define MODULEVERSION "1.02"
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/*
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* Transmit and device reset timeout, default 5 seconds.
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*/
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static int watchdog = 5000;
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/* Hardware structures */
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/**
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* struct rx_ring_desc - Receive descriptor ring element
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* @status: The status of the descriptor element (E.g. who owns it)
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* @length: The number of bytes in the block pointed to by data_ptr
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* @data_ptr: The physical address of the data block to receive into
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* @next_desc: The physical address of the next descriptor element.
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*/
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struct rx_ring_desc {
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__le32 status;
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__le32 length;
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__le32 data_ptr;
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__le32 next_desc;
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};
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/**
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* struct tx_ring_desc - Transmit descriptor ring element
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* @owner: Who owns the descriptor
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* @status: The number of bytes in the block pointed to by data_ptr
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* @data_ptr: The physical address of the data block to receive into
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* @next_desc: The physical address of the next descriptor element.
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*/
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struct tx_ring_desc {
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__le32 owner;
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__le32 status;
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__le32 data_ptr;
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__le32 next_desc;
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};
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/**
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* struct ks8695_skbuff - sk_buff wrapper for rx/tx rings.
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* @skb: The buffer in the ring
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* @dma_ptr: The mapped DMA pointer of the buffer
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* @length: The number of bytes mapped to dma_ptr
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*/
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struct ks8695_skbuff {
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struct sk_buff *skb;
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dma_addr_t dma_ptr;
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u32 length;
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};
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/* Private device structure */
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#define MAX_TX_DESC 8
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#define MAX_TX_DESC_MASK 0x7
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#define MAX_RX_DESC 16
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#define MAX_RX_DESC_MASK 0xf
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/*napi_weight have better more than rx DMA buffers*/
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#define NAPI_WEIGHT 64
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#define MAX_RXBUF_SIZE 0x700
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#define TX_RING_DMA_SIZE (sizeof(struct tx_ring_desc) * MAX_TX_DESC)
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#define RX_RING_DMA_SIZE (sizeof(struct rx_ring_desc) * MAX_RX_DESC)
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#define RING_DMA_SIZE (TX_RING_DMA_SIZE + RX_RING_DMA_SIZE)
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/**
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* enum ks8695_dtype - Device type
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* @KS8695_DTYPE_WAN: This device is a WAN interface
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* @KS8695_DTYPE_LAN: This device is a LAN interface
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* @KS8695_DTYPE_HPNA: This device is an HPNA interface
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*/
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enum ks8695_dtype {
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KS8695_DTYPE_WAN,
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KS8695_DTYPE_LAN,
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KS8695_DTYPE_HPNA,
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};
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/**
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* struct ks8695_priv - Private data for the KS8695 Ethernet
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* @in_suspend: Flag to indicate if we're suspending/resuming
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* @ndev: The net_device for this interface
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* @dev: The platform device object for this interface
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* @dtype: The type of this device
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* @io_regs: The ioremapped registers for this interface
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* @napi : Add support NAPI for Rx
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* @rx_irq_name: The textual name of the RX IRQ from the platform data
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* @tx_irq_name: The textual name of the TX IRQ from the platform data
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* @link_irq_name: The textual name of the link IRQ from the
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* platform data if available
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* @rx_irq: The IRQ number for the RX IRQ
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* @tx_irq: The IRQ number for the TX IRQ
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* @link_irq: The IRQ number for the link IRQ if available
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* @regs_req: The resource request for the registers region
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* @phyiface_req: The resource request for the phy/switch region
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* if available
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* @phyiface_regs: The ioremapped registers for the phy/switch if available
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* @ring_base: The base pointer of the dma coherent memory for the rings
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* @ring_base_dma: The DMA mapped equivalent of ring_base
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* @tx_ring: The pointer in ring_base of the TX ring
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* @tx_ring_used: The number of slots in the TX ring which are occupied
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* @tx_ring_next_slot: The next slot to fill in the TX ring
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* @tx_ring_dma: The DMA mapped equivalent of tx_ring
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* @tx_buffers: The sk_buff mappings for the TX ring
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* @txq_lock: A lock to protect the tx_buffers tx_ring_used etc variables
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* @rx_ring: The pointer in ring_base of the RX ring
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* @rx_ring_dma: The DMA mapped equivalent of rx_ring
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* @rx_buffers: The sk_buff mappings for the RX ring
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* @next_rx_desc_read: The next RX descriptor to read from on IRQ
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* @rx_lock: A lock to protect Rx irq function
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* @msg_enable: The flags for which messages to emit
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*/
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struct ks8695_priv {
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int in_suspend;
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struct net_device *ndev;
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struct device *dev;
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enum ks8695_dtype dtype;
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void __iomem *io_regs;
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struct napi_struct napi;
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const char *rx_irq_name, *tx_irq_name, *link_irq_name;
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int rx_irq, tx_irq, link_irq;
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struct resource *regs_req, *phyiface_req;
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void __iomem *phyiface_regs;
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void *ring_base;
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dma_addr_t ring_base_dma;
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struct tx_ring_desc *tx_ring;
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int tx_ring_used;
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int tx_ring_next_slot;
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dma_addr_t tx_ring_dma;
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struct ks8695_skbuff tx_buffers[MAX_TX_DESC];
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spinlock_t txq_lock;
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struct rx_ring_desc *rx_ring;
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dma_addr_t rx_ring_dma;
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struct ks8695_skbuff rx_buffers[MAX_RX_DESC];
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int next_rx_desc_read;
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spinlock_t rx_lock;
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int msg_enable;
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};
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/* Register access */
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/**
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* ks8695_readreg - Read from a KS8695 ethernet register
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* @ksp: The device to read from
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* @reg: The register to read
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*/
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static inline u32
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ks8695_readreg(struct ks8695_priv *ksp, int reg)
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{
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return readl(ksp->io_regs + reg);
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}
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/**
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* ks8695_writereg - Write to a KS8695 ethernet register
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* @ksp: The device to write to
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* @reg: The register to write
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* @value: The value to write to the register
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*/
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static inline void
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ks8695_writereg(struct ks8695_priv *ksp, int reg, u32 value)
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{
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writel(value, ksp->io_regs + reg);
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}
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/* Utility functions */
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/**
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* ks8695_port_type - Retrieve port-type as user-friendly string
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* @ksp: The device to return the type for
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*
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* Returns a string indicating which of the WAN, LAN or HPNA
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* ports this device is likely to represent.
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*/
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static const char *
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ks8695_port_type(struct ks8695_priv *ksp)
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{
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switch (ksp->dtype) {
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case KS8695_DTYPE_LAN:
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return "LAN";
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case KS8695_DTYPE_WAN:
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return "WAN";
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case KS8695_DTYPE_HPNA:
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return "HPNA";
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}
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return "UNKNOWN";
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}
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/**
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* ks8695_update_mac - Update the MAC registers in the device
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* @ksp: The device to update
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*
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* Updates the MAC registers in the KS8695 device from the address in the
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* net_device structure associated with this interface.
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*/
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static void
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ks8695_update_mac(struct ks8695_priv *ksp)
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{
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/* Update the HW with the MAC from the net_device */
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struct net_device *ndev = ksp->ndev;
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u32 machigh, maclow;
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maclow = ((ndev->dev_addr[2] << 24) | (ndev->dev_addr[3] << 16) |
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(ndev->dev_addr[4] << 8) | (ndev->dev_addr[5] << 0));
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machigh = ((ndev->dev_addr[0] << 8) | (ndev->dev_addr[1] << 0));
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ks8695_writereg(ksp, KS8695_MAL, maclow);
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ks8695_writereg(ksp, KS8695_MAH, machigh);
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}
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/**
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* ks8695_refill_rxbuffers - Re-fill the RX buffer ring
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* @ksp: The device to refill
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*
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* Iterates the RX ring of the device looking for empty slots.
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* For each empty slot, we allocate and map a new SKB and give it
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* to the hardware.
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* This can be called from interrupt context safely.
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*/
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static void
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ks8695_refill_rxbuffers(struct ks8695_priv *ksp)
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{
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/* Run around the RX ring, filling in any missing sk_buff's */
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int buff_n;
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for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) {
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if (!ksp->rx_buffers[buff_n].skb) {
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struct sk_buff *skb = dev_alloc_skb(MAX_RXBUF_SIZE);
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dma_addr_t mapping;
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ksp->rx_buffers[buff_n].skb = skb;
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if (skb == NULL) {
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/* Failed to allocate one, perhaps
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* we'll try again later.
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*/
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break;
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}
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mapping = dma_map_single(ksp->dev, skb->data,
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MAX_RXBUF_SIZE,
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DMA_FROM_DEVICE);
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if (unlikely(dma_mapping_error(ksp->dev, mapping))) {
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/* Failed to DMA map this SKB, try later */
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dev_kfree_skb_irq(skb);
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ksp->rx_buffers[buff_n].skb = NULL;
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break;
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}
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ksp->rx_buffers[buff_n].dma_ptr = mapping;
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skb->dev = ksp->ndev;
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ksp->rx_buffers[buff_n].length = MAX_RXBUF_SIZE;
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/* Record this into the DMA ring */
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ksp->rx_ring[buff_n].data_ptr = cpu_to_le32(mapping);
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ksp->rx_ring[buff_n].length =
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cpu_to_le32(MAX_RXBUF_SIZE);
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wmb();
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/* And give ownership over to the hardware */
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ksp->rx_ring[buff_n].status = cpu_to_le32(RDES_OWN);
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}
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}
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}
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/* Maximum number of multicast addresses which the KS8695 HW supports */
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#define KS8695_NR_ADDRESSES 16
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/**
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* ks8695_init_partial_multicast - Init the mcast addr registers
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* @ksp: The device to initialise
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* @addr: The multicast address list to use
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* @nr_addr: The number of addresses in the list
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*
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* This routine is a helper for ks8695_set_multicast - it writes
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* the additional-address registers in the KS8695 ethernet device
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* and cleans up any others left behind.
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*/
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static void
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ks8695_init_partial_multicast(struct ks8695_priv *ksp,
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struct net_device *ndev)
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{
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u32 low, high;
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int i;
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struct netdev_hw_addr *ha;
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i = 0;
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netdev_for_each_mc_addr(ha, ndev) {
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/* Ran out of space in chip? */
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BUG_ON(i == KS8695_NR_ADDRESSES);
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low = (ha->addr[2] << 24) | (ha->addr[3] << 16) |
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(ha->addr[4] << 8) | (ha->addr[5]);
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high = (ha->addr[0] << 8) | (ha->addr[1]);
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ks8695_writereg(ksp, KS8695_AAL_(i), low);
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ks8695_writereg(ksp, KS8695_AAH_(i), AAH_E | high);
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i++;
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}
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/* Clear the remaining Additional Station Addresses */
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for (; i < KS8695_NR_ADDRESSES; i++) {
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ks8695_writereg(ksp, KS8695_AAL_(i), 0);
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ks8695_writereg(ksp, KS8695_AAH_(i), 0);
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}
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}
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/* Interrupt handling */
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/**
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* ks8695_tx_irq - Transmit IRQ handler
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* @irq: The IRQ which went off (ignored)
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* @dev_id: The net_device for the interrupt
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*
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* Process the TX ring, clearing out any transmitted slots.
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* Allows the net_device to pass us new packets once slots are
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* freed.
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*/
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static irqreturn_t
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ks8695_tx_irq(int irq, void *dev_id)
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{
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struct net_device *ndev = (struct net_device *)dev_id;
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struct ks8695_priv *ksp = netdev_priv(ndev);
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int buff_n;
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for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) {
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if (ksp->tx_buffers[buff_n].skb &&
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!(ksp->tx_ring[buff_n].owner & cpu_to_le32(TDES_OWN))) {
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rmb();
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/* An SKB which is not owned by HW is present */
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/* Update the stats for the net_device */
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ndev->stats.tx_packets++;
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ndev->stats.tx_bytes += ksp->tx_buffers[buff_n].length;
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/* Free the packet from the ring */
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ksp->tx_ring[buff_n].data_ptr = 0;
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/* Free the sk_buff */
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dma_unmap_single(ksp->dev,
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ksp->tx_buffers[buff_n].dma_ptr,
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ksp->tx_buffers[buff_n].length,
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DMA_TO_DEVICE);
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dev_kfree_skb_irq(ksp->tx_buffers[buff_n].skb);
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ksp->tx_buffers[buff_n].skb = NULL;
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ksp->tx_ring_used--;
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}
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}
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netif_wake_queue(ndev);
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return IRQ_HANDLED;
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}
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/**
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* ks8695_get_rx_enable_bit - Get rx interrupt enable/status bit
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* @ksp: Private data for the KS8695 Ethernet
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*
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* For KS8695 document:
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* Interrupt Enable Register (offset 0xE204)
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* Bit29 : WAN MAC Receive Interrupt Enable
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* Bit16 : LAN MAC Receive Interrupt Enable
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* Interrupt Status Register (Offset 0xF208)
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* Bit29: WAN MAC Receive Status
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* Bit16: LAN MAC Receive Status
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* So, this Rx interrrupt enable/status bit number is equal
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* as Rx IRQ number.
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*/
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static inline u32 ks8695_get_rx_enable_bit(struct ks8695_priv *ksp)
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{
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return ksp->rx_irq;
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}
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/**
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* ks8695_rx_irq - Receive IRQ handler
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* @irq: The IRQ which went off (ignored)
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* @dev_id: The net_device for the interrupt
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*
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* Inform NAPI that packet reception needs to be scheduled
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*/
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static irqreturn_t
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ks8695_rx_irq(int irq, void *dev_id)
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{
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struct net_device *ndev = (struct net_device *)dev_id;
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struct ks8695_priv *ksp = netdev_priv(ndev);
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spin_lock(&ksp->rx_lock);
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if (napi_schedule_prep(&ksp->napi)) {
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unsigned long status = readl(KS8695_IRQ_VA + KS8695_INTEN);
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unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
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/*disable rx interrupt*/
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status &= ~mask_bit;
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writel(status , KS8695_IRQ_VA + KS8695_INTEN);
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__napi_schedule(&ksp->napi);
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}
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spin_unlock(&ksp->rx_lock);
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return IRQ_HANDLED;
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}
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/**
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* ks8695_rx - Receive packets called by NAPI poll method
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* @ksp: Private data for the KS8695 Ethernet
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* @budget: Number of packets allowed to process
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*/
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static int ks8695_rx(struct ks8695_priv *ksp, int budget)
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{
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struct net_device *ndev = ksp->ndev;
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struct sk_buff *skb;
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int buff_n;
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u32 flags;
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int pktlen;
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int received = 0;
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buff_n = ksp->next_rx_desc_read;
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while (received < budget
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&& ksp->rx_buffers[buff_n].skb
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&& (!(ksp->rx_ring[buff_n].status &
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cpu_to_le32(RDES_OWN)))) {
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rmb();
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flags = le32_to_cpu(ksp->rx_ring[buff_n].status);
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/* Found an SKB which we own, this means we
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* received a packet
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*/
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if ((flags & (RDES_FS | RDES_LS)) !=
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(RDES_FS | RDES_LS)) {
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/* This packet is not the first and
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* the last segment. Therefore it is
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* a "spanning" packet and we can't
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* handle it
|
|
*/
|
|
goto rx_failure;
|
|
}
|
|
|
|
if (flags & (RDES_ES | RDES_RE)) {
|
|
/* It's an error packet */
|
|
ndev->stats.rx_errors++;
|
|
if (flags & RDES_TL)
|
|
ndev->stats.rx_length_errors++;
|
|
if (flags & RDES_RF)
|
|
ndev->stats.rx_length_errors++;
|
|
if (flags & RDES_CE)
|
|
ndev->stats.rx_crc_errors++;
|
|
if (flags & RDES_RE)
|
|
ndev->stats.rx_missed_errors++;
|
|
|
|
goto rx_failure;
|
|
}
|
|
|
|
pktlen = flags & RDES_FLEN;
|
|
pktlen -= 4; /* Drop the CRC */
|
|
|
|
/* Retrieve the sk_buff */
|
|
skb = ksp->rx_buffers[buff_n].skb;
|
|
|
|
/* Clear it from the ring */
|
|
ksp->rx_buffers[buff_n].skb = NULL;
|
|
ksp->rx_ring[buff_n].data_ptr = 0;
|
|
|
|
/* Unmap the SKB */
|
|
dma_unmap_single(ksp->dev,
|
|
ksp->rx_buffers[buff_n].dma_ptr,
|
|
ksp->rx_buffers[buff_n].length,
|
|
DMA_FROM_DEVICE);
|
|
|
|
/* Relinquish the SKB to the network layer */
|
|
skb_put(skb, pktlen);
|
|
skb->protocol = eth_type_trans(skb, ndev);
|
|
netif_receive_skb(skb);
|
|
|
|
/* Record stats */
|
|
ndev->stats.rx_packets++;
|
|
ndev->stats.rx_bytes += pktlen;
|
|
goto rx_finished;
|
|
|
|
rx_failure:
|
|
/* This ring entry is an error, but we can
|
|
* re-use the skb
|
|
*/
|
|
/* Give the ring entry back to the hardware */
|
|
ksp->rx_ring[buff_n].status = cpu_to_le32(RDES_OWN);
|
|
rx_finished:
|
|
received++;
|
|
buff_n = (buff_n + 1) & MAX_RX_DESC_MASK;
|
|
}
|
|
|
|
/* And note which RX descriptor we last did */
|
|
ksp->next_rx_desc_read = buff_n;
|
|
|
|
/* And refill the buffers */
|
|
ks8695_refill_rxbuffers(ksp);
|
|
|
|
/* Kick the RX DMA engine, in case it became suspended */
|
|
ks8695_writereg(ksp, KS8695_DRSC, 0);
|
|
|
|
return received;
|
|
}
|
|
|
|
|
|
/**
|
|
* ks8695_poll - Receive packet by NAPI poll method
|
|
* @ksp: Private data for the KS8695 Ethernet
|
|
* @budget: The remaining number packets for network subsystem
|
|
*
|
|
* Invoked by the network core when it requests for new
|
|
* packets from the driver
|
|
*/
|
|
static int ks8695_poll(struct napi_struct *napi, int budget)
|
|
{
|
|
struct ks8695_priv *ksp = container_of(napi, struct ks8695_priv, napi);
|
|
unsigned long work_done;
|
|
|
|
unsigned long isr = readl(KS8695_IRQ_VA + KS8695_INTEN);
|
|
unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
|
|
|
|
work_done = ks8695_rx(ksp, budget);
|
|
|
|
if (work_done < budget) {
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&ksp->rx_lock, flags);
|
|
__napi_complete(napi);
|
|
/*enable rx interrupt*/
|
|
writel(isr | mask_bit, KS8695_IRQ_VA + KS8695_INTEN);
|
|
spin_unlock_irqrestore(&ksp->rx_lock, flags);
|
|
}
|
|
return work_done;
|
|
}
|
|
|
|
/**
|
|
* ks8695_link_irq - Link change IRQ handler
|
|
* @irq: The IRQ which went off (ignored)
|
|
* @dev_id: The net_device for the interrupt
|
|
*
|
|
* The WAN interface can generate an IRQ when the link changes,
|
|
* report this to the net layer and the user.
|
|
*/
|
|
static irqreturn_t
|
|
ks8695_link_irq(int irq, void *dev_id)
|
|
{
|
|
struct net_device *ndev = (struct net_device *)dev_id;
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
u32 ctrl;
|
|
|
|
ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
|
|
if (ctrl & WMC_WLS) {
|
|
netif_carrier_on(ndev);
|
|
if (netif_msg_link(ksp))
|
|
dev_info(ksp->dev,
|
|
"%s: Link is now up (10%sMbps/%s-duplex)\n",
|
|
ndev->name,
|
|
(ctrl & WMC_WSS) ? "0" : "",
|
|
(ctrl & WMC_WDS) ? "Full" : "Half");
|
|
} else {
|
|
netif_carrier_off(ndev);
|
|
if (netif_msg_link(ksp))
|
|
dev_info(ksp->dev, "%s: Link is now down.\n",
|
|
ndev->name);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
/* KS8695 Device functions */
|
|
|
|
/**
|
|
* ks8695_reset - Reset a KS8695 ethernet interface
|
|
* @ksp: The interface to reset
|
|
*
|
|
* Perform an engine reset of the interface and re-program it
|
|
* with sensible defaults.
|
|
*/
|
|
static void
|
|
ks8695_reset(struct ks8695_priv *ksp)
|
|
{
|
|
int reset_timeout = watchdog;
|
|
/* Issue the reset via the TX DMA control register */
|
|
ks8695_writereg(ksp, KS8695_DTXC, DTXC_TRST);
|
|
while (reset_timeout--) {
|
|
if (!(ks8695_readreg(ksp, KS8695_DTXC) & DTXC_TRST))
|
|
break;
|
|
msleep(1);
|
|
}
|
|
|
|
if (reset_timeout < 0) {
|
|
dev_crit(ksp->dev,
|
|
"Timeout waiting for DMA engines to reset\n");
|
|
/* And blithely carry on */
|
|
}
|
|
|
|
/* Definitely wait long enough before attempting to program
|
|
* the engines
|
|
*/
|
|
msleep(10);
|
|
|
|
/* RX: unicast and broadcast */
|
|
ks8695_writereg(ksp, KS8695_DRXC, DRXC_RU | DRXC_RB);
|
|
/* TX: pad and add CRC */
|
|
ks8695_writereg(ksp, KS8695_DTXC, DTXC_TEP | DTXC_TAC);
|
|
}
|
|
|
|
/**
|
|
* ks8695_shutdown - Shut down a KS8695 ethernet interface
|
|
* @ksp: The interface to shut down
|
|
*
|
|
* This disables packet RX/TX, cleans up IRQs, drains the rings,
|
|
* and basically places the interface into a clean shutdown
|
|
* state.
|
|
*/
|
|
static void
|
|
ks8695_shutdown(struct ks8695_priv *ksp)
|
|
{
|
|
u32 ctrl;
|
|
int buff_n;
|
|
|
|
/* Disable packet transmission */
|
|
ctrl = ks8695_readreg(ksp, KS8695_DTXC);
|
|
ks8695_writereg(ksp, KS8695_DTXC, ctrl & ~DTXC_TE);
|
|
|
|
/* Disable packet reception */
|
|
ctrl = ks8695_readreg(ksp, KS8695_DRXC);
|
|
ks8695_writereg(ksp, KS8695_DRXC, ctrl & ~DRXC_RE);
|
|
|
|
/* Release the IRQs */
|
|
free_irq(ksp->rx_irq, ksp->ndev);
|
|
free_irq(ksp->tx_irq, ksp->ndev);
|
|
if (ksp->link_irq != -1)
|
|
free_irq(ksp->link_irq, ksp->ndev);
|
|
|
|
/* Throw away any pending TX packets */
|
|
for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) {
|
|
if (ksp->tx_buffers[buff_n].skb) {
|
|
/* Remove this SKB from the TX ring */
|
|
ksp->tx_ring[buff_n].owner = 0;
|
|
ksp->tx_ring[buff_n].status = 0;
|
|
ksp->tx_ring[buff_n].data_ptr = 0;
|
|
|
|
/* Unmap and bin this SKB */
|
|
dma_unmap_single(ksp->dev,
|
|
ksp->tx_buffers[buff_n].dma_ptr,
|
|
ksp->tx_buffers[buff_n].length,
|
|
DMA_TO_DEVICE);
|
|
dev_kfree_skb_irq(ksp->tx_buffers[buff_n].skb);
|
|
ksp->tx_buffers[buff_n].skb = NULL;
|
|
}
|
|
}
|
|
|
|
/* Purge the RX buffers */
|
|
for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) {
|
|
if (ksp->rx_buffers[buff_n].skb) {
|
|
/* Remove the SKB from the RX ring */
|
|
ksp->rx_ring[buff_n].status = 0;
|
|
ksp->rx_ring[buff_n].data_ptr = 0;
|
|
|
|
/* Unmap and bin the SKB */
|
|
dma_unmap_single(ksp->dev,
|
|
ksp->rx_buffers[buff_n].dma_ptr,
|
|
ksp->rx_buffers[buff_n].length,
|
|
DMA_FROM_DEVICE);
|
|
dev_kfree_skb_irq(ksp->rx_buffers[buff_n].skb);
|
|
ksp->rx_buffers[buff_n].skb = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* ks8695_setup_irq - IRQ setup helper function
|
|
* @irq: The IRQ number to claim
|
|
* @irq_name: The name to give the IRQ claimant
|
|
* @handler: The function to call to handle the IRQ
|
|
* @ndev: The net_device to pass in as the dev_id argument to the handler
|
|
*
|
|
* Return 0 on success.
|
|
*/
|
|
static int
|
|
ks8695_setup_irq(int irq, const char *irq_name,
|
|
irq_handler_t handler, struct net_device *ndev)
|
|
{
|
|
int ret;
|
|
|
|
ret = request_irq(irq, handler, IRQF_SHARED, irq_name, ndev);
|
|
|
|
if (ret) {
|
|
dev_err(&ndev->dev, "failure to request IRQ %d\n", irq);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_init_net - Initialise a KS8695 ethernet interface
|
|
* @ksp: The interface to initialise
|
|
*
|
|
* This routine fills the RX ring, initialises the DMA engines,
|
|
* allocates the IRQs and then starts the packet TX and RX
|
|
* engines.
|
|
*/
|
|
static int
|
|
ks8695_init_net(struct ks8695_priv *ksp)
|
|
{
|
|
int ret;
|
|
u32 ctrl;
|
|
|
|
ks8695_refill_rxbuffers(ksp);
|
|
|
|
/* Initialise the DMA engines */
|
|
ks8695_writereg(ksp, KS8695_RDLB, (u32) ksp->rx_ring_dma);
|
|
ks8695_writereg(ksp, KS8695_TDLB, (u32) ksp->tx_ring_dma);
|
|
|
|
/* Request the IRQs */
|
|
ret = ks8695_setup_irq(ksp->rx_irq, ksp->rx_irq_name,
|
|
ks8695_rx_irq, ksp->ndev);
|
|
if (ret)
|
|
return ret;
|
|
ret = ks8695_setup_irq(ksp->tx_irq, ksp->tx_irq_name,
|
|
ks8695_tx_irq, ksp->ndev);
|
|
if (ret)
|
|
return ret;
|
|
if (ksp->link_irq != -1) {
|
|
ret = ks8695_setup_irq(ksp->link_irq, ksp->link_irq_name,
|
|
ks8695_link_irq, ksp->ndev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* Set up the ring indices */
|
|
ksp->next_rx_desc_read = 0;
|
|
ksp->tx_ring_next_slot = 0;
|
|
ksp->tx_ring_used = 0;
|
|
|
|
/* Bring up transmission */
|
|
ctrl = ks8695_readreg(ksp, KS8695_DTXC);
|
|
/* Enable packet transmission */
|
|
ks8695_writereg(ksp, KS8695_DTXC, ctrl | DTXC_TE);
|
|
|
|
/* Bring up the reception */
|
|
ctrl = ks8695_readreg(ksp, KS8695_DRXC);
|
|
/* Enable packet reception */
|
|
ks8695_writereg(ksp, KS8695_DRXC, ctrl | DRXC_RE);
|
|
/* And start the DMA engine */
|
|
ks8695_writereg(ksp, KS8695_DRSC, 0);
|
|
|
|
/* All done */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_release_device - HW resource release for KS8695 e-net
|
|
* @ksp: The device to be freed
|
|
*
|
|
* This unallocates io memory regions, dma-coherent regions etc
|
|
* which were allocated in ks8695_probe.
|
|
*/
|
|
static void
|
|
ks8695_release_device(struct ks8695_priv *ksp)
|
|
{
|
|
/* Unmap the registers */
|
|
iounmap(ksp->io_regs);
|
|
if (ksp->phyiface_regs)
|
|
iounmap(ksp->phyiface_regs);
|
|
|
|
/* And release the request */
|
|
release_resource(ksp->regs_req);
|
|
kfree(ksp->regs_req);
|
|
if (ksp->phyiface_req) {
|
|
release_resource(ksp->phyiface_req);
|
|
kfree(ksp->phyiface_req);
|
|
}
|
|
|
|
/* Free the ring buffers */
|
|
dma_free_coherent(ksp->dev, RING_DMA_SIZE,
|
|
ksp->ring_base, ksp->ring_base_dma);
|
|
}
|
|
|
|
/* Ethtool support */
|
|
|
|
/**
|
|
* ks8695_get_msglevel - Get the messages enabled for emission
|
|
* @ndev: The network device to read from
|
|
*/
|
|
static u32
|
|
ks8695_get_msglevel(struct net_device *ndev)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
|
|
return ksp->msg_enable;
|
|
}
|
|
|
|
/**
|
|
* ks8695_set_msglevel - Set the messages enabled for emission
|
|
* @ndev: The network device to configure
|
|
* @value: The messages to set for emission
|
|
*/
|
|
static void
|
|
ks8695_set_msglevel(struct net_device *ndev, u32 value)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
|
|
ksp->msg_enable = value;
|
|
}
|
|
|
|
/**
|
|
* ks8695_get_settings - Get device-specific settings.
|
|
* @ndev: The network device to read settings from
|
|
* @cmd: The ethtool structure to read into
|
|
*/
|
|
static int
|
|
ks8695_get_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
u32 ctrl;
|
|
|
|
/* All ports on the KS8695 support these... */
|
|
cmd->supported = (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
|
|
SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
|
|
SUPPORTED_TP | SUPPORTED_MII);
|
|
cmd->transceiver = XCVR_INTERNAL;
|
|
|
|
/* Port specific extras */
|
|
switch (ksp->dtype) {
|
|
case KS8695_DTYPE_HPNA:
|
|
cmd->phy_address = 0;
|
|
/* not supported for HPNA */
|
|
cmd->autoneg = AUTONEG_DISABLE;
|
|
|
|
/* BUG: Erm, dtype hpna implies no phy regs */
|
|
/*
|
|
ctrl = readl(KS8695_MISC_VA + KS8695_HMC);
|
|
cmd->speed = (ctrl & HMC_HSS) ? SPEED_100 : SPEED_10;
|
|
cmd->duplex = (ctrl & HMC_HDS) ? DUPLEX_FULL : DUPLEX_HALF;
|
|
*/
|
|
return -EOPNOTSUPP;
|
|
case KS8695_DTYPE_WAN:
|
|
cmd->advertising = ADVERTISED_TP | ADVERTISED_MII;
|
|
cmd->port = PORT_MII;
|
|
cmd->supported |= (SUPPORTED_Autoneg | SUPPORTED_Pause);
|
|
cmd->phy_address = 0;
|
|
|
|
ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
|
|
if ((ctrl & WMC_WAND) == 0) {
|
|
/* auto-negotiation is enabled */
|
|
cmd->advertising |= ADVERTISED_Autoneg;
|
|
if (ctrl & WMC_WANA100F)
|
|
cmd->advertising |= ADVERTISED_100baseT_Full;
|
|
if (ctrl & WMC_WANA100H)
|
|
cmd->advertising |= ADVERTISED_100baseT_Half;
|
|
if (ctrl & WMC_WANA10F)
|
|
cmd->advertising |= ADVERTISED_10baseT_Full;
|
|
if (ctrl & WMC_WANA10H)
|
|
cmd->advertising |= ADVERTISED_10baseT_Half;
|
|
if (ctrl & WMC_WANAP)
|
|
cmd->advertising |= ADVERTISED_Pause;
|
|
cmd->autoneg = AUTONEG_ENABLE;
|
|
|
|
cmd->speed = (ctrl & WMC_WSS) ? SPEED_100 : SPEED_10;
|
|
cmd->duplex = (ctrl & WMC_WDS) ?
|
|
DUPLEX_FULL : DUPLEX_HALF;
|
|
} else {
|
|
/* auto-negotiation is disabled */
|
|
cmd->autoneg = AUTONEG_DISABLE;
|
|
|
|
cmd->speed = (ctrl & WMC_WANF100) ?
|
|
SPEED_100 : SPEED_10;
|
|
cmd->duplex = (ctrl & WMC_WANFF) ?
|
|
DUPLEX_FULL : DUPLEX_HALF;
|
|
}
|
|
break;
|
|
case KS8695_DTYPE_LAN:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_set_settings - Set device-specific settings.
|
|
* @ndev: The network device to configure
|
|
* @cmd: The settings to configure
|
|
*/
|
|
static int
|
|
ks8695_set_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
u32 ctrl;
|
|
|
|
if ((cmd->speed != SPEED_10) && (cmd->speed != SPEED_100))
|
|
return -EINVAL;
|
|
if ((cmd->duplex != DUPLEX_HALF) && (cmd->duplex != DUPLEX_FULL))
|
|
return -EINVAL;
|
|
if (cmd->port != PORT_MII)
|
|
return -EINVAL;
|
|
if (cmd->transceiver != XCVR_INTERNAL)
|
|
return -EINVAL;
|
|
if ((cmd->autoneg != AUTONEG_DISABLE) &&
|
|
(cmd->autoneg != AUTONEG_ENABLE))
|
|
return -EINVAL;
|
|
|
|
if (cmd->autoneg == AUTONEG_ENABLE) {
|
|
if ((cmd->advertising & (ADVERTISED_10baseT_Half |
|
|
ADVERTISED_10baseT_Full |
|
|
ADVERTISED_100baseT_Half |
|
|
ADVERTISED_100baseT_Full)) == 0)
|
|
return -EINVAL;
|
|
|
|
switch (ksp->dtype) {
|
|
case KS8695_DTYPE_HPNA:
|
|
/* HPNA does not support auto-negotiation. */
|
|
return -EINVAL;
|
|
case KS8695_DTYPE_WAN:
|
|
ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
|
|
|
|
ctrl &= ~(WMC_WAND | WMC_WANA100F | WMC_WANA100H |
|
|
WMC_WANA10F | WMC_WANA10H);
|
|
if (cmd->advertising & ADVERTISED_100baseT_Full)
|
|
ctrl |= WMC_WANA100F;
|
|
if (cmd->advertising & ADVERTISED_100baseT_Half)
|
|
ctrl |= WMC_WANA100H;
|
|
if (cmd->advertising & ADVERTISED_10baseT_Full)
|
|
ctrl |= WMC_WANA10F;
|
|
if (cmd->advertising & ADVERTISED_10baseT_Half)
|
|
ctrl |= WMC_WANA10H;
|
|
|
|
/* force a re-negotiation */
|
|
ctrl |= WMC_WANR;
|
|
writel(ctrl, ksp->phyiface_regs + KS8695_WMC);
|
|
break;
|
|
case KS8695_DTYPE_LAN:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
} else {
|
|
switch (ksp->dtype) {
|
|
case KS8695_DTYPE_HPNA:
|
|
/* BUG: dtype_hpna implies no phy registers */
|
|
/*
|
|
ctrl = __raw_readl(KS8695_MISC_VA + KS8695_HMC);
|
|
|
|
ctrl &= ~(HMC_HSS | HMC_HDS);
|
|
if (cmd->speed == SPEED_100)
|
|
ctrl |= HMC_HSS;
|
|
if (cmd->duplex == DUPLEX_FULL)
|
|
ctrl |= HMC_HDS;
|
|
|
|
__raw_writel(ctrl, KS8695_MISC_VA + KS8695_HMC);
|
|
*/
|
|
return -EOPNOTSUPP;
|
|
case KS8695_DTYPE_WAN:
|
|
ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
|
|
|
|
/* disable auto-negotiation */
|
|
ctrl |= WMC_WAND;
|
|
ctrl &= ~(WMC_WANF100 | WMC_WANFF);
|
|
|
|
if (cmd->speed == SPEED_100)
|
|
ctrl |= WMC_WANF100;
|
|
if (cmd->duplex == DUPLEX_FULL)
|
|
ctrl |= WMC_WANFF;
|
|
|
|
writel(ctrl, ksp->phyiface_regs + KS8695_WMC);
|
|
break;
|
|
case KS8695_DTYPE_LAN:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_nwayreset - Restart the autonegotiation on the port.
|
|
* @ndev: The network device to restart autoneotiation on
|
|
*/
|
|
static int
|
|
ks8695_nwayreset(struct net_device *ndev)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
u32 ctrl;
|
|
|
|
switch (ksp->dtype) {
|
|
case KS8695_DTYPE_HPNA:
|
|
/* No phy means no autonegotiation on hpna */
|
|
return -EINVAL;
|
|
case KS8695_DTYPE_WAN:
|
|
ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
|
|
|
|
if ((ctrl & WMC_WAND) == 0)
|
|
writel(ctrl | WMC_WANR,
|
|
ksp->phyiface_regs + KS8695_WMC);
|
|
else
|
|
/* auto-negotiation not enabled */
|
|
return -EINVAL;
|
|
break;
|
|
case KS8695_DTYPE_LAN:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_get_link - Retrieve link status of network interface
|
|
* @ndev: The network interface to retrive the link status of.
|
|
*/
|
|
static u32
|
|
ks8695_get_link(struct net_device *ndev)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
u32 ctrl;
|
|
|
|
switch (ksp->dtype) {
|
|
case KS8695_DTYPE_HPNA:
|
|
/* HPNA always has link */
|
|
return 1;
|
|
case KS8695_DTYPE_WAN:
|
|
/* WAN we can read the PHY for */
|
|
ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
|
|
return ctrl & WMC_WLS;
|
|
case KS8695_DTYPE_LAN:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_get_pause - Retrieve network pause/flow-control advertising
|
|
* @ndev: The device to retrieve settings from
|
|
* @param: The structure to fill out with the information
|
|
*/
|
|
static void
|
|
ks8695_get_pause(struct net_device *ndev, struct ethtool_pauseparam *param)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
u32 ctrl;
|
|
|
|
switch (ksp->dtype) {
|
|
case KS8695_DTYPE_HPNA:
|
|
/* No phy link on hpna to configure */
|
|
return;
|
|
case KS8695_DTYPE_WAN:
|
|
ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
|
|
|
|
/* advertise Pause */
|
|
param->autoneg = (ctrl & WMC_WANAP);
|
|
|
|
/* current Rx Flow-control */
|
|
ctrl = ks8695_readreg(ksp, KS8695_DRXC);
|
|
param->rx_pause = (ctrl & DRXC_RFCE);
|
|
|
|
/* current Tx Flow-control */
|
|
ctrl = ks8695_readreg(ksp, KS8695_DTXC);
|
|
param->tx_pause = (ctrl & DTXC_TFCE);
|
|
break;
|
|
case KS8695_DTYPE_LAN:
|
|
/* The LAN's "phy" is a direct-attached switch */
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ks8695_set_pause - Configure pause/flow-control
|
|
* @ndev: The device to configure
|
|
* @param: The pause parameters to set
|
|
*
|
|
* TODO: Implement this
|
|
*/
|
|
static int
|
|
ks8695_set_pause(struct net_device *ndev, struct ethtool_pauseparam *param)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/**
|
|
* ks8695_get_drvinfo - Retrieve driver information
|
|
* @ndev: The network device to retrieve info about
|
|
* @info: The info structure to fill out.
|
|
*/
|
|
static void
|
|
ks8695_get_drvinfo(struct net_device *ndev, struct ethtool_drvinfo *info)
|
|
{
|
|
strlcpy(info->driver, MODULENAME, sizeof(info->driver));
|
|
strlcpy(info->version, MODULEVERSION, sizeof(info->version));
|
|
strlcpy(info->bus_info, dev_name(ndev->dev.parent),
|
|
sizeof(info->bus_info));
|
|
}
|
|
|
|
static const struct ethtool_ops ks8695_ethtool_ops = {
|
|
.get_msglevel = ks8695_get_msglevel,
|
|
.set_msglevel = ks8695_set_msglevel,
|
|
.get_settings = ks8695_get_settings,
|
|
.set_settings = ks8695_set_settings,
|
|
.nway_reset = ks8695_nwayreset,
|
|
.get_link = ks8695_get_link,
|
|
.get_pauseparam = ks8695_get_pause,
|
|
.set_pauseparam = ks8695_set_pause,
|
|
.get_drvinfo = ks8695_get_drvinfo,
|
|
};
|
|
|
|
/* Network device interface functions */
|
|
|
|
/**
|
|
* ks8695_set_mac - Update MAC in net dev and HW
|
|
* @ndev: The network device to update
|
|
* @addr: The new MAC address to set
|
|
*/
|
|
static int
|
|
ks8695_set_mac(struct net_device *ndev, void *addr)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
struct sockaddr *address = addr;
|
|
|
|
if (!is_valid_ether_addr(address->sa_data))
|
|
return -EADDRNOTAVAIL;
|
|
|
|
memcpy(ndev->dev_addr, address->sa_data, ndev->addr_len);
|
|
|
|
ks8695_update_mac(ksp);
|
|
|
|
dev_dbg(ksp->dev, "%s: Updated MAC address to %pM\n",
|
|
ndev->name, ndev->dev_addr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_set_multicast - Set up the multicast behaviour of the interface
|
|
* @ndev: The net_device to configure
|
|
*
|
|
* This routine, called by the net layer, configures promiscuity
|
|
* and multicast reception behaviour for the interface.
|
|
*/
|
|
static void
|
|
ks8695_set_multicast(struct net_device *ndev)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
u32 ctrl;
|
|
|
|
ctrl = ks8695_readreg(ksp, KS8695_DRXC);
|
|
|
|
if (ndev->flags & IFF_PROMISC) {
|
|
/* enable promiscuous mode */
|
|
ctrl |= DRXC_RA;
|
|
} else if (ndev->flags & ~IFF_PROMISC) {
|
|
/* disable promiscuous mode */
|
|
ctrl &= ~DRXC_RA;
|
|
}
|
|
|
|
if (ndev->flags & IFF_ALLMULTI) {
|
|
/* enable all multicast mode */
|
|
ctrl |= DRXC_RM;
|
|
} else if (netdev_mc_count(ndev) > KS8695_NR_ADDRESSES) {
|
|
/* more specific multicast addresses than can be
|
|
* handled in hardware
|
|
*/
|
|
ctrl |= DRXC_RM;
|
|
} else {
|
|
/* enable specific multicasts */
|
|
ctrl &= ~DRXC_RM;
|
|
ks8695_init_partial_multicast(ksp, ndev);
|
|
}
|
|
|
|
ks8695_writereg(ksp, KS8695_DRXC, ctrl);
|
|
}
|
|
|
|
/**
|
|
* ks8695_timeout - Handle a network tx/rx timeout.
|
|
* @ndev: The net_device which timed out.
|
|
*
|
|
* A network transaction timed out, reset the device.
|
|
*/
|
|
static void
|
|
ks8695_timeout(struct net_device *ndev)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
|
|
netif_stop_queue(ndev);
|
|
ks8695_shutdown(ksp);
|
|
|
|
ks8695_reset(ksp);
|
|
|
|
ks8695_update_mac(ksp);
|
|
|
|
/* We ignore the return from this since it managed to init
|
|
* before it probably will be okay to init again.
|
|
*/
|
|
ks8695_init_net(ksp);
|
|
|
|
/* Reconfigure promiscuity etc */
|
|
ks8695_set_multicast(ndev);
|
|
|
|
/* And start the TX queue once more */
|
|
netif_start_queue(ndev);
|
|
}
|
|
|
|
/**
|
|
* ks8695_start_xmit - Start a packet transmission
|
|
* @skb: The packet to transmit
|
|
* @ndev: The network device to send the packet on
|
|
*
|
|
* This routine, called by the net layer, takes ownership of the
|
|
* sk_buff and adds it to the TX ring. It then kicks the TX DMA
|
|
* engine to ensure transmission begins.
|
|
*/
|
|
static int
|
|
ks8695_start_xmit(struct sk_buff *skb, struct net_device *ndev)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
int buff_n;
|
|
dma_addr_t dmap;
|
|
|
|
spin_lock_irq(&ksp->txq_lock);
|
|
|
|
if (ksp->tx_ring_used == MAX_TX_DESC) {
|
|
/* Somehow we got entered when we have no room */
|
|
spin_unlock_irq(&ksp->txq_lock);
|
|
return NETDEV_TX_BUSY;
|
|
}
|
|
|
|
buff_n = ksp->tx_ring_next_slot;
|
|
|
|
BUG_ON(ksp->tx_buffers[buff_n].skb);
|
|
|
|
dmap = dma_map_single(ksp->dev, skb->data, skb->len, DMA_TO_DEVICE);
|
|
if (unlikely(dma_mapping_error(ksp->dev, dmap))) {
|
|
/* Failed to DMA map this SKB, give it back for now */
|
|
spin_unlock_irq(&ksp->txq_lock);
|
|
dev_dbg(ksp->dev, "%s: Could not map DMA memory for "\
|
|
"transmission, trying later\n", ndev->name);
|
|
return NETDEV_TX_BUSY;
|
|
}
|
|
|
|
ksp->tx_buffers[buff_n].dma_ptr = dmap;
|
|
/* Mapped okay, store the buffer pointer and length for later */
|
|
ksp->tx_buffers[buff_n].skb = skb;
|
|
ksp->tx_buffers[buff_n].length = skb->len;
|
|
|
|
/* Fill out the TX descriptor */
|
|
ksp->tx_ring[buff_n].data_ptr =
|
|
cpu_to_le32(ksp->tx_buffers[buff_n].dma_ptr);
|
|
ksp->tx_ring[buff_n].status =
|
|
cpu_to_le32(TDES_IC | TDES_FS | TDES_LS |
|
|
(skb->len & TDES_TBS));
|
|
|
|
wmb();
|
|
|
|
/* Hand it over to the hardware */
|
|
ksp->tx_ring[buff_n].owner = cpu_to_le32(TDES_OWN);
|
|
|
|
if (++ksp->tx_ring_used == MAX_TX_DESC)
|
|
netif_stop_queue(ndev);
|
|
|
|
/* Kick the TX DMA in case it decided to go IDLE */
|
|
ks8695_writereg(ksp, KS8695_DTSC, 0);
|
|
|
|
/* And update the next ring slot */
|
|
ksp->tx_ring_next_slot = (buff_n + 1) & MAX_TX_DESC_MASK;
|
|
|
|
spin_unlock_irq(&ksp->txq_lock);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/**
|
|
* ks8695_stop - Stop (shutdown) a KS8695 ethernet interface
|
|
* @ndev: The net_device to stop
|
|
*
|
|
* This disables the TX queue and cleans up a KS8695 ethernet
|
|
* device.
|
|
*/
|
|
static int
|
|
ks8695_stop(struct net_device *ndev)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
|
|
netif_stop_queue(ndev);
|
|
napi_disable(&ksp->napi);
|
|
|
|
ks8695_shutdown(ksp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_open - Open (bring up) a KS8695 ethernet interface
|
|
* @ndev: The net_device to open
|
|
*
|
|
* This resets, configures the MAC, initialises the RX ring and
|
|
* DMA engines and starts the TX queue for a KS8695 ethernet
|
|
* device.
|
|
*/
|
|
static int
|
|
ks8695_open(struct net_device *ndev)
|
|
{
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
int ret;
|
|
|
|
if (!is_valid_ether_addr(ndev->dev_addr))
|
|
return -EADDRNOTAVAIL;
|
|
|
|
ks8695_reset(ksp);
|
|
|
|
ks8695_update_mac(ksp);
|
|
|
|
ret = ks8695_init_net(ksp);
|
|
if (ret) {
|
|
ks8695_shutdown(ksp);
|
|
return ret;
|
|
}
|
|
|
|
napi_enable(&ksp->napi);
|
|
netif_start_queue(ndev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Platform device driver */
|
|
|
|
/**
|
|
* ks8695_init_switch - Init LAN switch to known good defaults.
|
|
* @ksp: The device to initialise
|
|
*
|
|
* This initialises the LAN switch in the KS8695 to a known-good
|
|
* set of defaults.
|
|
*/
|
|
static void __devinit
|
|
ks8695_init_switch(struct ks8695_priv *ksp)
|
|
{
|
|
u32 ctrl;
|
|
|
|
/* Default value for SEC0 according to datasheet */
|
|
ctrl = 0x40819e00;
|
|
|
|
/* LED0 = Speed LED1 = Link/Activity */
|
|
ctrl &= ~(SEC0_LLED1S | SEC0_LLED0S);
|
|
ctrl |= (LLED0S_LINK | LLED1S_LINK_ACTIVITY);
|
|
|
|
/* Enable Switch */
|
|
ctrl |= SEC0_ENABLE;
|
|
|
|
writel(ctrl, ksp->phyiface_regs + KS8695_SEC0);
|
|
|
|
/* Defaults for SEC1 */
|
|
writel(0x9400100, ksp->phyiface_regs + KS8695_SEC1);
|
|
}
|
|
|
|
/**
|
|
* ks8695_init_wan_phy - Initialise the WAN PHY to sensible defaults
|
|
* @ksp: The device to initialise
|
|
*
|
|
* This initialises a KS8695's WAN phy to sensible values for
|
|
* autonegotiation etc.
|
|
*/
|
|
static void __devinit
|
|
ks8695_init_wan_phy(struct ks8695_priv *ksp)
|
|
{
|
|
u32 ctrl;
|
|
|
|
/* Support auto-negotiation */
|
|
ctrl = (WMC_WANAP | WMC_WANA100F | WMC_WANA100H |
|
|
WMC_WANA10F | WMC_WANA10H);
|
|
|
|
/* LED0 = Activity , LED1 = Link */
|
|
ctrl |= (WLED0S_ACTIVITY | WLED1S_LINK);
|
|
|
|
/* Restart Auto-negotiation */
|
|
ctrl |= WMC_WANR;
|
|
|
|
writel(ctrl, ksp->phyiface_regs + KS8695_WMC);
|
|
|
|
writel(0, ksp->phyiface_regs + KS8695_WPPM);
|
|
writel(0, ksp->phyiface_regs + KS8695_PPS);
|
|
}
|
|
|
|
static const struct net_device_ops ks8695_netdev_ops = {
|
|
.ndo_open = ks8695_open,
|
|
.ndo_stop = ks8695_stop,
|
|
.ndo_start_xmit = ks8695_start_xmit,
|
|
.ndo_tx_timeout = ks8695_timeout,
|
|
.ndo_set_mac_address = ks8695_set_mac,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
.ndo_set_multicast_list = ks8695_set_multicast,
|
|
};
|
|
|
|
/**
|
|
* ks8695_probe - Probe and initialise a KS8695 ethernet interface
|
|
* @pdev: The platform device to probe
|
|
*
|
|
* Initialise a KS8695 ethernet device from platform data.
|
|
*
|
|
* This driver requires at least one IORESOURCE_MEM for the
|
|
* registers and two IORESOURCE_IRQ for the RX and TX IRQs
|
|
* respectively. It can optionally take an additional
|
|
* IORESOURCE_MEM for the switch or phy in the case of the lan or
|
|
* wan ports, and an IORESOURCE_IRQ for the link IRQ for the wan
|
|
* port.
|
|
*/
|
|
static int __devinit
|
|
ks8695_probe(struct platform_device *pdev)
|
|
{
|
|
struct ks8695_priv *ksp;
|
|
struct net_device *ndev;
|
|
struct resource *regs_res, *phyiface_res;
|
|
struct resource *rxirq_res, *txirq_res, *linkirq_res;
|
|
int ret = 0;
|
|
int buff_n;
|
|
u32 machigh, maclow;
|
|
|
|
/* Initialise a net_device */
|
|
ndev = alloc_etherdev(sizeof(struct ks8695_priv));
|
|
if (!ndev) {
|
|
dev_err(&pdev->dev, "could not allocate device.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
SET_NETDEV_DEV(ndev, &pdev->dev);
|
|
|
|
dev_dbg(&pdev->dev, "ks8695_probe() called\n");
|
|
|
|
/* Configure our private structure a little */
|
|
ksp = netdev_priv(ndev);
|
|
|
|
ksp->dev = &pdev->dev;
|
|
ksp->ndev = ndev;
|
|
ksp->msg_enable = NETIF_MSG_LINK;
|
|
|
|
/* Retrieve resources */
|
|
regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
phyiface_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
|
|
rxirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
txirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
|
|
linkirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 2);
|
|
|
|
if (!(regs_res && rxirq_res && txirq_res)) {
|
|
dev_err(ksp->dev, "insufficient resources\n");
|
|
ret = -ENOENT;
|
|
goto failure;
|
|
}
|
|
|
|
ksp->regs_req = request_mem_region(regs_res->start,
|
|
resource_size(regs_res),
|
|
pdev->name);
|
|
|
|
if (!ksp->regs_req) {
|
|
dev_err(ksp->dev, "cannot claim register space\n");
|
|
ret = -EIO;
|
|
goto failure;
|
|
}
|
|
|
|
ksp->io_regs = ioremap(regs_res->start, resource_size(regs_res));
|
|
|
|
if (!ksp->io_regs) {
|
|
dev_err(ksp->dev, "failed to ioremap registers\n");
|
|
ret = -EINVAL;
|
|
goto failure;
|
|
}
|
|
|
|
if (phyiface_res) {
|
|
ksp->phyiface_req =
|
|
request_mem_region(phyiface_res->start,
|
|
resource_size(phyiface_res),
|
|
phyiface_res->name);
|
|
|
|
if (!ksp->phyiface_req) {
|
|
dev_err(ksp->dev,
|
|
"cannot claim switch register space\n");
|
|
ret = -EIO;
|
|
goto failure;
|
|
}
|
|
|
|
ksp->phyiface_regs = ioremap(phyiface_res->start,
|
|
resource_size(phyiface_res));
|
|
|
|
if (!ksp->phyiface_regs) {
|
|
dev_err(ksp->dev,
|
|
"failed to ioremap switch registers\n");
|
|
ret = -EINVAL;
|
|
goto failure;
|
|
}
|
|
}
|
|
|
|
ksp->rx_irq = rxirq_res->start;
|
|
ksp->rx_irq_name = rxirq_res->name ? rxirq_res->name : "Ethernet RX";
|
|
ksp->tx_irq = txirq_res->start;
|
|
ksp->tx_irq_name = txirq_res->name ? txirq_res->name : "Ethernet TX";
|
|
ksp->link_irq = (linkirq_res ? linkirq_res->start : -1);
|
|
ksp->link_irq_name = (linkirq_res && linkirq_res->name) ?
|
|
linkirq_res->name : "Ethernet Link";
|
|
|
|
/* driver system setup */
|
|
ndev->netdev_ops = &ks8695_netdev_ops;
|
|
SET_ETHTOOL_OPS(ndev, &ks8695_ethtool_ops);
|
|
ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
|
|
|
|
netif_napi_add(ndev, &ksp->napi, ks8695_poll, NAPI_WEIGHT);
|
|
|
|
/* Retrieve the default MAC addr from the chip. */
|
|
/* The bootloader should have left it in there for us. */
|
|
|
|
machigh = ks8695_readreg(ksp, KS8695_MAH);
|
|
maclow = ks8695_readreg(ksp, KS8695_MAL);
|
|
|
|
ndev->dev_addr[0] = (machigh >> 8) & 0xFF;
|
|
ndev->dev_addr[1] = machigh & 0xFF;
|
|
ndev->dev_addr[2] = (maclow >> 24) & 0xFF;
|
|
ndev->dev_addr[3] = (maclow >> 16) & 0xFF;
|
|
ndev->dev_addr[4] = (maclow >> 8) & 0xFF;
|
|
ndev->dev_addr[5] = maclow & 0xFF;
|
|
|
|
if (!is_valid_ether_addr(ndev->dev_addr))
|
|
dev_warn(ksp->dev, "%s: Invalid ethernet MAC address. Please "
|
|
"set using ifconfig\n", ndev->name);
|
|
|
|
/* In order to be efficient memory-wise, we allocate both
|
|
* rings in one go.
|
|
*/
|
|
ksp->ring_base = dma_alloc_coherent(&pdev->dev, RING_DMA_SIZE,
|
|
&ksp->ring_base_dma, GFP_KERNEL);
|
|
if (!ksp->ring_base) {
|
|
ret = -ENOMEM;
|
|
goto failure;
|
|
}
|
|
|
|
/* Specify the TX DMA ring buffer */
|
|
ksp->tx_ring = ksp->ring_base;
|
|
ksp->tx_ring_dma = ksp->ring_base_dma;
|
|
|
|
/* And initialise the queue's lock */
|
|
spin_lock_init(&ksp->txq_lock);
|
|
spin_lock_init(&ksp->rx_lock);
|
|
|
|
/* Specify the RX DMA ring buffer */
|
|
ksp->rx_ring = ksp->ring_base + TX_RING_DMA_SIZE;
|
|
ksp->rx_ring_dma = ksp->ring_base_dma + TX_RING_DMA_SIZE;
|
|
|
|
/* Zero the descriptor rings */
|
|
memset(ksp->tx_ring, 0, TX_RING_DMA_SIZE);
|
|
memset(ksp->rx_ring, 0, RX_RING_DMA_SIZE);
|
|
|
|
/* Build the rings */
|
|
for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) {
|
|
ksp->tx_ring[buff_n].next_desc =
|
|
cpu_to_le32(ksp->tx_ring_dma +
|
|
(sizeof(struct tx_ring_desc) *
|
|
((buff_n + 1) & MAX_TX_DESC_MASK)));
|
|
}
|
|
|
|
for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) {
|
|
ksp->rx_ring[buff_n].next_desc =
|
|
cpu_to_le32(ksp->rx_ring_dma +
|
|
(sizeof(struct rx_ring_desc) *
|
|
((buff_n + 1) & MAX_RX_DESC_MASK)));
|
|
}
|
|
|
|
/* Initialise the port (physically) */
|
|
if (ksp->phyiface_regs && ksp->link_irq == -1) {
|
|
ks8695_init_switch(ksp);
|
|
ksp->dtype = KS8695_DTYPE_LAN;
|
|
} else if (ksp->phyiface_regs && ksp->link_irq != -1) {
|
|
ks8695_init_wan_phy(ksp);
|
|
ksp->dtype = KS8695_DTYPE_WAN;
|
|
} else {
|
|
/* No initialisation since HPNA does not have a PHY */
|
|
ksp->dtype = KS8695_DTYPE_HPNA;
|
|
}
|
|
|
|
/* And bring up the net_device with the net core */
|
|
platform_set_drvdata(pdev, ndev);
|
|
ret = register_netdev(ndev);
|
|
|
|
if (ret == 0) {
|
|
dev_info(ksp->dev, "ks8695 ethernet (%s) MAC: %pM\n",
|
|
ks8695_port_type(ksp), ndev->dev_addr);
|
|
} else {
|
|
/* Report the failure to register the net_device */
|
|
dev_err(ksp->dev, "ks8695net: failed to register netdev.\n");
|
|
goto failure;
|
|
}
|
|
|
|
/* All is well */
|
|
return 0;
|
|
|
|
/* Error exit path */
|
|
failure:
|
|
ks8695_release_device(ksp);
|
|
free_netdev(ndev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ks8695_drv_suspend - Suspend a KS8695 ethernet platform device.
|
|
* @pdev: The device to suspend
|
|
* @state: The suspend state
|
|
*
|
|
* This routine detaches and shuts down a KS8695 ethernet device.
|
|
*/
|
|
static int
|
|
ks8695_drv_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct net_device *ndev = platform_get_drvdata(pdev);
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
|
|
ksp->in_suspend = 1;
|
|
|
|
if (netif_running(ndev)) {
|
|
netif_device_detach(ndev);
|
|
ks8695_shutdown(ksp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_drv_resume - Resume a KS8695 ethernet platform device.
|
|
* @pdev: The device to resume
|
|
*
|
|
* This routine re-initialises and re-attaches a KS8695 ethernet
|
|
* device.
|
|
*/
|
|
static int
|
|
ks8695_drv_resume(struct platform_device *pdev)
|
|
{
|
|
struct net_device *ndev = platform_get_drvdata(pdev);
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
|
|
if (netif_running(ndev)) {
|
|
ks8695_reset(ksp);
|
|
ks8695_init_net(ksp);
|
|
ks8695_set_multicast(ndev);
|
|
netif_device_attach(ndev);
|
|
}
|
|
|
|
ksp->in_suspend = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ks8695_drv_remove - Remove a KS8695 net device on driver unload.
|
|
* @pdev: The platform device to remove
|
|
*
|
|
* This unregisters and releases a KS8695 ethernet device.
|
|
*/
|
|
static int __devexit
|
|
ks8695_drv_remove(struct platform_device *pdev)
|
|
{
|
|
struct net_device *ndev = platform_get_drvdata(pdev);
|
|
struct ks8695_priv *ksp = netdev_priv(ndev);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
netif_napi_del(&ksp->napi);
|
|
|
|
unregister_netdev(ndev);
|
|
ks8695_release_device(ksp);
|
|
free_netdev(ndev);
|
|
|
|
dev_dbg(&pdev->dev, "released and freed device\n");
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ks8695_driver = {
|
|
.driver = {
|
|
.name = MODULENAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ks8695_probe,
|
|
.remove = __devexit_p(ks8695_drv_remove),
|
|
.suspend = ks8695_drv_suspend,
|
|
.resume = ks8695_drv_resume,
|
|
};
|
|
|
|
/* Module interface */
|
|
|
|
static int __init
|
|
ks8695_init(void)
|
|
{
|
|
printk(KERN_INFO "%s Ethernet driver, V%s\n",
|
|
MODULENAME, MODULEVERSION);
|
|
|
|
return platform_driver_register(&ks8695_driver);
|
|
}
|
|
|
|
static void __exit
|
|
ks8695_cleanup(void)
|
|
{
|
|
platform_driver_unregister(&ks8695_driver);
|
|
}
|
|
|
|
module_init(ks8695_init);
|
|
module_exit(ks8695_cleanup);
|
|
|
|
MODULE_AUTHOR("Simtec Electronics")
|
|
MODULE_DESCRIPTION("Micrel KS8695 (Centaur) Ethernet driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" MODULENAME);
|
|
|
|
module_param(watchdog, int, 0400);
|
|
MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");
|