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aha/drivers/net/arm/ks8695net.c
zeal 5c427ff9e4 KS8695: fix ks8695_rx() unreasonable action. 
ks8695_rx() will call refill_buffers() for every incoming packet.
Its not necessary. We just need do it after finishing receiving thing.
And the 'RX dma engine' is in the same situation.
This blocks our user space application. The following patch may fix it.

Signed-off-by: zeal <zealcook@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-11-16 23:51:47 -08:00

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/*
* Micrel KS8695 (Centaur) Ethernet.
*
* This program 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.
*
* This program 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.
*
* Copyright 2008 Simtec Electronics
* Daniel Silverstone <dsilvers@simtec.co.uk>
* Vincent Sanders <vince@simtec.co.uk>
*/
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/crc32.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <mach/regs-switch.h>
#include <mach/regs-misc.h>
#include <asm/mach/irq.h>
#include <mach/regs-irq.h>
#include "ks8695net.h"
#define MODULENAME "ks8695_ether"
#define MODULEVERSION "1.02"
/*
* Transmit and device reset timeout, default 5 seconds.
*/
static int watchdog = 5000;
/* Hardware structures */
/**
* struct rx_ring_desc - Receive descriptor ring element
* @status: The status of the descriptor element (E.g. who owns it)
* @length: The number of bytes in the block pointed to by data_ptr
* @data_ptr: The physical address of the data block to receive into
* @next_desc: The physical address of the next descriptor element.
*/
struct rx_ring_desc {
__le32 status;
__le32 length;
__le32 data_ptr;
__le32 next_desc;
};
/**
* struct tx_ring_desc - Transmit descriptor ring element
* @owner: Who owns the descriptor
* @status: The number of bytes in the block pointed to by data_ptr
* @data_ptr: The physical address of the data block to receive into
* @next_desc: The physical address of the next descriptor element.
*/
struct tx_ring_desc {
__le32 owner;
__le32 status;
__le32 data_ptr;
__le32 next_desc;
};
/**
* struct ks8695_skbuff - sk_buff wrapper for rx/tx rings.
* @skb: The buffer in the ring
* @dma_ptr: The mapped DMA pointer of the buffer
* @length: The number of bytes mapped to dma_ptr
*/
struct ks8695_skbuff {
struct sk_buff *skb;
dma_addr_t dma_ptr;
u32 length;
};
/* Private device structure */
#define MAX_TX_DESC 8
#define MAX_TX_DESC_MASK 0x7
#define MAX_RX_DESC 16
#define MAX_RX_DESC_MASK 0xf
/*napi_weight have better more than rx DMA buffers*/
#define NAPI_WEIGHT 64
#define MAX_RXBUF_SIZE 0x700
#define TX_RING_DMA_SIZE (sizeof(struct tx_ring_desc) * MAX_TX_DESC)
#define RX_RING_DMA_SIZE (sizeof(struct rx_ring_desc) * MAX_RX_DESC)
#define RING_DMA_SIZE (TX_RING_DMA_SIZE + RX_RING_DMA_SIZE)
/**
* enum ks8695_dtype - Device type
* @KS8695_DTYPE_WAN: This device is a WAN interface
* @KS8695_DTYPE_LAN: This device is a LAN interface
* @KS8695_DTYPE_HPNA: This device is an HPNA interface
*/
enum ks8695_dtype {
KS8695_DTYPE_WAN,
KS8695_DTYPE_LAN,
KS8695_DTYPE_HPNA,
};
/**
* struct ks8695_priv - Private data for the KS8695 Ethernet
* @in_suspend: Flag to indicate if we're suspending/resuming
* @ndev: The net_device for this interface
* @dev: The platform device object for this interface
* @dtype: The type of this device
* @io_regs: The ioremapped registers for this interface
* @napi : Add support NAPI for Rx
* @rx_irq_name: The textual name of the RX IRQ from the platform data
* @tx_irq_name: The textual name of the TX IRQ from the platform data
* @link_irq_name: The textual name of the link IRQ from the
* platform data if available
* @rx_irq: The IRQ number for the RX IRQ
* @tx_irq: The IRQ number for the TX IRQ
* @link_irq: The IRQ number for the link IRQ if available
* @regs_req: The resource request for the registers region
* @phyiface_req: The resource request for the phy/switch region
* if available
* @phyiface_regs: The ioremapped registers for the phy/switch if available
* @ring_base: The base pointer of the dma coherent memory for the rings
* @ring_base_dma: The DMA mapped equivalent of ring_base
* @tx_ring: The pointer in ring_base of the TX ring
* @tx_ring_used: The number of slots in the TX ring which are occupied
* @tx_ring_next_slot: The next slot to fill in the TX ring
* @tx_ring_dma: The DMA mapped equivalent of tx_ring
* @tx_buffers: The sk_buff mappings for the TX ring
* @txq_lock: A lock to protect the tx_buffers tx_ring_used etc variables
* @rx_ring: The pointer in ring_base of the RX ring
* @rx_ring_dma: The DMA mapped equivalent of rx_ring
* @rx_buffers: The sk_buff mappings for the RX ring
* @next_rx_desc_read: The next RX descriptor to read from on IRQ
* @rx_lock: A lock to protect Rx irq function
* @msg_enable: The flags for which messages to emit
*/
struct ks8695_priv {
int in_suspend;
struct net_device *ndev;
struct device *dev;
enum ks8695_dtype dtype;
void __iomem *io_regs;
struct napi_struct napi;
const char *rx_irq_name, *tx_irq_name, *link_irq_name;
int rx_irq, tx_irq, link_irq;
struct resource *regs_req, *phyiface_req;
void __iomem *phyiface_regs;
void *ring_base;
dma_addr_t ring_base_dma;
struct tx_ring_desc *tx_ring;
int tx_ring_used;
int tx_ring_next_slot;
dma_addr_t tx_ring_dma;
struct ks8695_skbuff tx_buffers[MAX_TX_DESC];
spinlock_t txq_lock;
struct rx_ring_desc *rx_ring;
dma_addr_t rx_ring_dma;
struct ks8695_skbuff rx_buffers[MAX_RX_DESC];
int next_rx_desc_read;
spinlock_t rx_lock;
int msg_enable;
};
/* Register access */
/**
* ks8695_readreg - Read from a KS8695 ethernet register
* @ksp: The device to read from
* @reg: The register to read
*/
static inline u32
ks8695_readreg(struct ks8695_priv *ksp, int reg)
{
return readl(ksp->io_regs + reg);
}
/**
* ks8695_writereg - Write to a KS8695 ethernet register
* @ksp: The device to write to
* @reg: The register to write
* @value: The value to write to the register
*/
static inline void
ks8695_writereg(struct ks8695_priv *ksp, int reg, u32 value)
{
writel(value, ksp->io_regs + reg);
}
/* Utility functions */
/**
* ks8695_port_type - Retrieve port-type as user-friendly string
* @ksp: The device to return the type for
*
* Returns a string indicating which of the WAN, LAN or HPNA
* ports this device is likely to represent.
*/
static const char *
ks8695_port_type(struct ks8695_priv *ksp)
{
switch (ksp->dtype) {
case KS8695_DTYPE_LAN:
return "LAN";
case KS8695_DTYPE_WAN:
return "WAN";
case KS8695_DTYPE_HPNA:
return "HPNA";
}
return "UNKNOWN";
}
/**
* ks8695_update_mac - Update the MAC registers in the device
* @ksp: The device to update
*
* Updates the MAC registers in the KS8695 device from the address in the
* net_device structure associated with this interface.
*/
static void
ks8695_update_mac(struct ks8695_priv *ksp)
{
/* Update the HW with the MAC from the net_device */
struct net_device *ndev = ksp->ndev;
u32 machigh, maclow;
maclow = ((ndev->dev_addr[2] << 24) | (ndev->dev_addr[3] << 16) |
(ndev->dev_addr[4] << 8) | (ndev->dev_addr[5] << 0));
machigh = ((ndev->dev_addr[0] << 8) | (ndev->dev_addr[1] << 0));
ks8695_writereg(ksp, KS8695_MAL, maclow);
ks8695_writereg(ksp, KS8695_MAH, machigh);
}
/**
* ks8695_refill_rxbuffers - Re-fill the RX buffer ring
* @ksp: The device to refill
*
* Iterates the RX ring of the device looking for empty slots.
* For each empty slot, we allocate and map a new SKB and give it
* to the hardware.
* This can be called from interrupt context safely.
*/
static void
ks8695_refill_rxbuffers(struct ks8695_priv *ksp)
{
/* Run around the RX ring, filling in any missing sk_buff's */
int buff_n;
for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) {
if (!ksp->rx_buffers[buff_n].skb) {
struct sk_buff *skb = dev_alloc_skb(MAX_RXBUF_SIZE);
dma_addr_t mapping;
ksp->rx_buffers[buff_n].skb = skb;
if (skb == NULL) {
/* Failed to allocate one, perhaps
* we'll try again later.
*/
break;
}
mapping = dma_map_single(ksp->dev, skb->data,
MAX_RXBUF_SIZE,
DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(ksp->dev, mapping))) {
/* Failed to DMA map this SKB, try later */
dev_kfree_skb_irq(skb);
ksp->rx_buffers[buff_n].skb = NULL;
break;
}
ksp->rx_buffers[buff_n].dma_ptr = mapping;
skb->dev = ksp->ndev;
ksp->rx_buffers[buff_n].length = MAX_RXBUF_SIZE;
/* Record this into the DMA ring */
ksp->rx_ring[buff_n].data_ptr = cpu_to_le32(mapping);
ksp->rx_ring[buff_n].length =
cpu_to_le32(MAX_RXBUF_SIZE);
wmb();
/* And give ownership over to the hardware */
ksp->rx_ring[buff_n].status = cpu_to_le32(RDES_OWN);
}
}
}
/* Maximum number of multicast addresses which the KS8695 HW supports */
#define KS8695_NR_ADDRESSES 16
/**
* ks8695_init_partial_multicast - Init the mcast addr registers
* @ksp: The device to initialise
* @addr: The multicast address list to use
* @nr_addr: The number of addresses in the list
*
* This routine is a helper for ks8695_set_multicast - it writes
* the additional-address registers in the KS8695 ethernet device
* and cleans up any others left behind.
*/
static void
ks8695_init_partial_multicast(struct ks8695_priv *ksp,
struct dev_mc_list *addr,
int nr_addr)
{
u32 low, high;
int i;
for (i = 0; i < nr_addr; i++, addr = addr->next) {
/* Ran out of addresses? */
if (!addr)
break;
/* Ran out of space in chip? */
BUG_ON(i == KS8695_NR_ADDRESSES);
low = (addr->dmi_addr[2] << 24) | (addr->dmi_addr[3] << 16) |
(addr->dmi_addr[4] << 8) | (addr->dmi_addr[5]);
high = (addr->dmi_addr[0] << 8) | (addr->dmi_addr[1]);
ks8695_writereg(ksp, KS8695_AAL_(i), low);
ks8695_writereg(ksp, KS8695_AAH_(i), AAH_E | high);
}
/* Clear the remaining Additional Station Addresses */
for (; i < KS8695_NR_ADDRESSES; i++) {
ks8695_writereg(ksp, KS8695_AAL_(i), 0);
ks8695_writereg(ksp, KS8695_AAH_(i), 0);
}
}
/* Interrupt handling */
/**
* ks8695_tx_irq - Transmit IRQ handler
* @irq: The IRQ which went off (ignored)
* @dev_id: The net_device for the interrupt
*
* Process the TX ring, clearing out any transmitted slots.
* Allows the net_device to pass us new packets once slots are
* freed.
*/
static irqreturn_t
ks8695_tx_irq(int irq, void *dev_id)
{
struct net_device *ndev = (struct net_device *)dev_id;
struct ks8695_priv *ksp = netdev_priv(ndev);
int buff_n;
for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) {
if (ksp->tx_buffers[buff_n].skb &&
!(ksp->tx_ring[buff_n].owner & cpu_to_le32(TDES_OWN))) {
rmb();
/* An SKB which is not owned by HW is present */
/* Update the stats for the net_device */
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += ksp->tx_buffers[buff_n].length;
/* Free the packet from the ring */
ksp->tx_ring[buff_n].data_ptr = 0;
/* Free the sk_buff */
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;
ksp->tx_ring_used--;
}
}
netif_wake_queue(ndev);
return IRQ_HANDLED;
}
/**
* ks8695_get_rx_enable_bit - Get rx interrupt enable/status bit
* @ksp: Private data for the KS8695 Ethernet
*
* For KS8695 document:
* Interrupt Enable Register (offset 0xE204)
* Bit29 : WAN MAC Receive Interrupt Enable
* Bit16 : LAN MAC Receive Interrupt Enable
* Interrupt Status Register (Offset 0xF208)
* Bit29: WAN MAC Receive Status
* Bit16: LAN MAC Receive Status
* So, this Rx interrrupt enable/status bit number is equal
* as Rx IRQ number.
*/
static inline u32 ks8695_get_rx_enable_bit(struct ks8695_priv *ksp)
{
return ksp->rx_irq;
}
/**
* ks8695_rx_irq - Receive IRQ handler
* @irq: The IRQ which went off (ignored)
* @dev_id: The net_device for the interrupt
*
* Inform NAPI that packet reception needs to be scheduled
*/
static irqreturn_t
ks8695_rx_irq(int irq, void *dev_id)
{
struct net_device *ndev = (struct net_device *)dev_id;
struct ks8695_priv *ksp = netdev_priv(ndev);
spin_lock(&ksp->rx_lock);
if (napi_schedule_prep(&ksp->napi)) {
unsigned long status = readl(KS8695_IRQ_VA + KS8695_INTEN);
unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
/*disable rx interrupt*/
status &= ~mask_bit;
writel(status , KS8695_IRQ_VA + KS8695_INTEN);
__napi_schedule(&ksp->napi);
}
spin_unlock(&ksp->rx_lock);
return IRQ_HANDLED;
}
/**
* ks8695_rx - Receive packets called by NAPI poll method
* @ksp: Private data for the KS8695 Ethernet
* @budget: The max packets would be receive
*/
static int ks8695_rx(struct ks8695_priv *ksp, int budget)
{
struct net_device *ndev = ksp->ndev;
struct sk_buff *skb;
int buff_n;
u32 flags;
int pktlen;
int last_rx_processed = -1;
int received = 0;
buff_n = ksp->next_rx_desc_read;
while (received < budget
&& ksp->rx_buffers[buff_n].skb
&& (!(ksp->rx_ring[buff_n].status &
cpu_to_le32(RDES_OWN)))) {
rmb();
flags = le32_to_cpu(ksp->rx_ring[buff_n].status);
/* Found an SKB which we own, this means we
* received a packet
*/
if ((flags & (RDES_FS | RDES_LS)) !=
(RDES_FS | RDES_LS)) {
/* This packet is not the first and
* the last segment. Therefore it is
* a "spanning" packet and we can't
* 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++;
/* And note this as processed so we can start
* from here next time
*/
last_rx_processed = buff_n;
buff_n = (buff_n + 1) & MAX_RX_DESC_MASK;
/*And note which RX descriptor we last did */
if (likely(last_rx_processed != -1))
ksp->next_rx_desc_read =
(last_rx_processed + 1) &
MAX_RX_DESC_MASK;
}
/* 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);
/*enable rx interrupt*/
writel(isr | mask_bit, KS8695_IRQ_VA + KS8695_INTEN);
__napi_complete(napi);
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 (ndev->mc_count > 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->mc_list,
ndev->mc_count);
}
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);
ndev->trans_start = jiffies;
/* 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);
netif_carrier_off(ndev);
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);
memset(ksp, 0, sizeof(struct ks8695_priv));
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");
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