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kernel-fxtec-pro1x/drivers/net/sb1250-mac.c
David S. Miller 689be43945 [NET]: Remove gratuitous use of skb->tail in network drivers. 
Many drivers use skb->tail unnecessarily.

In these situations, the code roughly looks like:

	dev = dev_alloc_skb(...);

	[optional] skb_reserve(skb, ...);

	... skb->tail ...

But even if the skb_reserve() happens, skb->data equals
skb->tail.  So it doesn't make any sense to use anything
other than skb->data in these cases.

Another case was the s2io.c driver directly mucking with
the skb->data and skb->tail pointers.  It really just wanted
to do an skb_reserve(), so that's what the code was changed
to do instead.

Another reason I'm making this change as it allows some SKB
cleanups I have planned simpler to merge.  In those cleanups,
skb->head, skb->tail, and skb->end pointers are removed, and
replaced with skb->head_room and skb->tail_room integers.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
2005-06-28 15:25:31 -07:00

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/*
* Copyright (C) 2001,2002,2003 Broadcom Corporation
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*
* This driver is designed for the Broadcom SiByte SOC built-in
* Ethernet controllers. Written by Mitch Lichtenberg at Broadcom Corp.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/config.h>
#include <linux/bitops.h>
#include <asm/processor.h> /* Processor type for cache alignment. */
#include <asm/io.h>
#include <asm/cache.h>
/* This is only here until the firmware is ready. In that case,
the firmware leaves the ethernet address in the register for us. */
#ifdef CONFIG_SIBYTE_STANDALONE
#define SBMAC_ETH0_HWADDR "40:00:00:00:01:00"
#define SBMAC_ETH1_HWADDR "40:00:00:00:01:01"
#define SBMAC_ETH2_HWADDR "40:00:00:00:01:02"
#endif
/* These identify the driver base version and may not be removed. */
#if 0
static char version1[] __devinitdata =
"sb1250-mac.c:1.00 1/11/2001 Written by Mitch Lichtenberg\n";
#endif
/* Operational parameters that usually are not changed. */
#define CONFIG_SBMAC_COALESCE
#define MAX_UNITS 3 /* More are supported, limit only on options */
/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT (2*HZ)
MODULE_AUTHOR("Mitch Lichtenberg (Broadcom Corp.)");
MODULE_DESCRIPTION("Broadcom SiByte SOC GB Ethernet driver");
/* A few user-configurable values which may be modified when a driver
module is loaded. */
/* 1 normal messages, 0 quiet .. 7 verbose. */
static int debug = 1;
module_param(debug, int, S_IRUGO);
MODULE_PARM_DESC(debug, "Debug messages");
/* mii status msgs */
static int noisy_mii = 1;
module_param(noisy_mii, int, S_IRUGO);
MODULE_PARM_DESC(noisy_mii, "MII status messages");
/* Used to pass the media type, etc.
Both 'options[]' and 'full_duplex[]' should exist for driver
interoperability.
The media type is usually passed in 'options[]'.
*/
#ifdef MODULE
static int options[MAX_UNITS] = {-1, -1, -1};
module_param_array(options, int, NULL, S_IRUGO);
MODULE_PARM_DESC(options, "1-" __MODULE_STRING(MAX_UNITS));
static int full_duplex[MAX_UNITS] = {-1, -1, -1};
module_param_array(full_duplex, int, NULL, S_IRUGO);
MODULE_PARM_DESC(full_duplex, "1-" __MODULE_STRING(MAX_UNITS));
#endif
#ifdef CONFIG_SBMAC_COALESCE
static int int_pktcnt = 0;
module_param(int_pktcnt, int, S_IRUGO);
MODULE_PARM_DESC(int_pktcnt, "Packet count");
static int int_timeout = 0;
module_param(int_timeout, int, S_IRUGO);
MODULE_PARM_DESC(int_timeout, "Timeout value");
#endif
#include <asm/sibyte/sb1250.h>
#include <asm/sibyte/sb1250_defs.h>
#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/sb1250_mac.h>
#include <asm/sibyte/sb1250_dma.h>
#include <asm/sibyte/sb1250_int.h>
#include <asm/sibyte/sb1250_scd.h>
/**********************************************************************
* Simple types
********************************************************************* */
typedef unsigned long sbmac_port_t;
typedef enum { sbmac_speed_auto, sbmac_speed_10,
sbmac_speed_100, sbmac_speed_1000 } sbmac_speed_t;
typedef enum { sbmac_duplex_auto, sbmac_duplex_half,
sbmac_duplex_full } sbmac_duplex_t;
typedef enum { sbmac_fc_auto, sbmac_fc_disabled, sbmac_fc_frame,
sbmac_fc_collision, sbmac_fc_carrier } sbmac_fc_t;
typedef enum { sbmac_state_uninit, sbmac_state_off, sbmac_state_on,
sbmac_state_broken } sbmac_state_t;
/**********************************************************************
* Macros
********************************************************************* */
#define SBDMA_NEXTBUF(d,f) ((((d)->f+1) == (d)->sbdma_dscrtable_end) ? \
(d)->sbdma_dscrtable : (d)->f+1)
#define NUMCACHEBLKS(x) (((x)+SMP_CACHE_BYTES-1)/SMP_CACHE_BYTES)
#define SBMAC_READCSR(t) __raw_readq((unsigned long)t)
#define SBMAC_WRITECSR(t,v) __raw_writeq(v, (unsigned long)t)
#define SBMAC_MAX_TXDESCR 32
#define SBMAC_MAX_RXDESCR 32
#define ETHER_ALIGN 2
#define ETHER_ADDR_LEN 6
#define ENET_PACKET_SIZE 1518
/*#define ENET_PACKET_SIZE 9216 */
/**********************************************************************
* DMA Descriptor structure
********************************************************************* */
typedef struct sbdmadscr_s {
uint64_t dscr_a;
uint64_t dscr_b;
} sbdmadscr_t;
typedef unsigned long paddr_t;
/**********************************************************************
* DMA Controller structure
********************************************************************* */
typedef struct sbmacdma_s {
/*
* This stuff is used to identify the channel and the registers
* associated with it.
*/
struct sbmac_softc *sbdma_eth; /* back pointer to associated MAC */
int sbdma_channel; /* channel number */
int sbdma_txdir; /* direction (1=transmit) */
int sbdma_maxdescr; /* total # of descriptors in ring */
#ifdef CONFIG_SBMAC_COALESCE
int sbdma_int_pktcnt; /* # descriptors rx/tx before interrupt*/
int sbdma_int_timeout; /* # usec rx/tx interrupt */
#endif
sbmac_port_t sbdma_config0; /* DMA config register 0 */
sbmac_port_t sbdma_config1; /* DMA config register 1 */
sbmac_port_t sbdma_dscrbase; /* Descriptor base address */
sbmac_port_t sbdma_dscrcnt; /* Descriptor count register */
sbmac_port_t sbdma_curdscr; /* current descriptor address */
/*
* This stuff is for maintenance of the ring
*/
sbdmadscr_t *sbdma_dscrtable; /* base of descriptor table */
sbdmadscr_t *sbdma_dscrtable_end; /* end of descriptor table */
struct sk_buff **sbdma_ctxtable; /* context table, one per descr */
paddr_t sbdma_dscrtable_phys; /* and also the phys addr */
sbdmadscr_t *sbdma_addptr; /* next dscr for sw to add */
sbdmadscr_t *sbdma_remptr; /* next dscr for sw to remove */
} sbmacdma_t;
/**********************************************************************
* Ethernet softc structure
********************************************************************* */
struct sbmac_softc {
/*
* Linux-specific things
*/
struct net_device *sbm_dev; /* pointer to linux device */
spinlock_t sbm_lock; /* spin lock */
struct timer_list sbm_timer; /* for monitoring MII */
struct net_device_stats sbm_stats;
int sbm_devflags; /* current device flags */
int sbm_phy_oldbmsr;
int sbm_phy_oldanlpar;
int sbm_phy_oldk1stsr;
int sbm_phy_oldlinkstat;
int sbm_buffersize;
unsigned char sbm_phys[2];
/*
* Controller-specific things
*/
unsigned long sbm_base; /* MAC's base address */
sbmac_state_t sbm_state; /* current state */
sbmac_port_t sbm_macenable; /* MAC Enable Register */
sbmac_port_t sbm_maccfg; /* MAC Configuration Register */
sbmac_port_t sbm_fifocfg; /* FIFO configuration register */
sbmac_port_t sbm_framecfg; /* Frame configuration register */
sbmac_port_t sbm_rxfilter; /* receive filter register */
sbmac_port_t sbm_isr; /* Interrupt status register */
sbmac_port_t sbm_imr; /* Interrupt mask register */
sbmac_port_t sbm_mdio; /* MDIO register */
sbmac_speed_t sbm_speed; /* current speed */
sbmac_duplex_t sbm_duplex; /* current duplex */
sbmac_fc_t sbm_fc; /* current flow control setting */
unsigned char sbm_hwaddr[ETHER_ADDR_LEN];
sbmacdma_t sbm_txdma; /* for now, only use channel 0 */
sbmacdma_t sbm_rxdma;
int rx_hw_checksum;
int sbe_idx;
};
/**********************************************************************
* Externs
********************************************************************* */
/**********************************************************************
* Prototypes
********************************************************************* */
static void sbdma_initctx(sbmacdma_t *d,
struct sbmac_softc *s,
int chan,
int txrx,
int maxdescr);
static void sbdma_channel_start(sbmacdma_t *d, int rxtx);
static int sbdma_add_rcvbuffer(sbmacdma_t *d,struct sk_buff *m);
static int sbdma_add_txbuffer(sbmacdma_t *d,struct sk_buff *m);
static void sbdma_emptyring(sbmacdma_t *d);
static void sbdma_fillring(sbmacdma_t *d);
static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d);
static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d);
static int sbmac_initctx(struct sbmac_softc *s);
static void sbmac_channel_start(struct sbmac_softc *s);
static void sbmac_channel_stop(struct sbmac_softc *s);
static sbmac_state_t sbmac_set_channel_state(struct sbmac_softc *,sbmac_state_t);
static void sbmac_promiscuous_mode(struct sbmac_softc *sc,int onoff);
static uint64_t sbmac_addr2reg(unsigned char *ptr);
static irqreturn_t sbmac_intr(int irq,void *dev_instance,struct pt_regs *rgs);
static int sbmac_start_tx(struct sk_buff *skb, struct net_device *dev);
static void sbmac_setmulti(struct sbmac_softc *sc);
static int sbmac_init(struct net_device *dev, int idx);
static int sbmac_set_speed(struct sbmac_softc *s,sbmac_speed_t speed);
static int sbmac_set_duplex(struct sbmac_softc *s,sbmac_duplex_t duplex,sbmac_fc_t fc);
static int sbmac_open(struct net_device *dev);
static void sbmac_timer(unsigned long data);
static void sbmac_tx_timeout (struct net_device *dev);
static struct net_device_stats *sbmac_get_stats(struct net_device *dev);
static void sbmac_set_rx_mode(struct net_device *dev);
static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static int sbmac_close(struct net_device *dev);
static int sbmac_mii_poll(struct sbmac_softc *s,int noisy);
static void sbmac_mii_sync(struct sbmac_softc *s);
static void sbmac_mii_senddata(struct sbmac_softc *s,unsigned int data, int bitcnt);
static unsigned int sbmac_mii_read(struct sbmac_softc *s,int phyaddr,int regidx);
static void sbmac_mii_write(struct sbmac_softc *s,int phyaddr,int regidx,
unsigned int regval);
/**********************************************************************
* Globals
********************************************************************* */
static uint64_t sbmac_orig_hwaddr[MAX_UNITS];
/**********************************************************************
* MDIO constants
********************************************************************* */
#define MII_COMMAND_START 0x01
#define MII_COMMAND_READ 0x02
#define MII_COMMAND_WRITE 0x01
#define MII_COMMAND_ACK 0x02
#define BMCR_RESET 0x8000
#define BMCR_LOOPBACK 0x4000
#define BMCR_SPEED0 0x2000
#define BMCR_ANENABLE 0x1000
#define BMCR_POWERDOWN 0x0800
#define BMCR_ISOLATE 0x0400
#define BMCR_RESTARTAN 0x0200
#define BMCR_DUPLEX 0x0100
#define BMCR_COLTEST 0x0080
#define BMCR_SPEED1 0x0040
#define BMCR_SPEED1000 BMCR_SPEED1
#define BMCR_SPEED100 BMCR_SPEED0
#define BMCR_SPEED10 0
#define BMSR_100BT4 0x8000
#define BMSR_100BT_FDX 0x4000
#define BMSR_100BT_HDX 0x2000
#define BMSR_10BT_FDX 0x1000
#define BMSR_10BT_HDX 0x0800
#define BMSR_100BT2_FDX 0x0400
#define BMSR_100BT2_HDX 0x0200
#define BMSR_1000BT_XSR 0x0100
#define BMSR_PRESUP 0x0040
#define BMSR_ANCOMPLT 0x0020
#define BMSR_REMFAULT 0x0010
#define BMSR_AUTONEG 0x0008
#define BMSR_LINKSTAT 0x0004
#define BMSR_JABDETECT 0x0002
#define BMSR_EXTCAPAB 0x0001
#define PHYIDR1 0x2000
#define PHYIDR2 0x5C60
#define ANAR_NP 0x8000
#define ANAR_RF 0x2000
#define ANAR_ASYPAUSE 0x0800
#define ANAR_PAUSE 0x0400
#define ANAR_T4 0x0200
#define ANAR_TXFD 0x0100
#define ANAR_TXHD 0x0080
#define ANAR_10FD 0x0040
#define ANAR_10HD 0x0020
#define ANAR_PSB 0x0001
#define ANLPAR_NP 0x8000
#define ANLPAR_ACK 0x4000
#define ANLPAR_RF 0x2000
#define ANLPAR_ASYPAUSE 0x0800
#define ANLPAR_PAUSE 0x0400
#define ANLPAR_T4 0x0200
#define ANLPAR_TXFD 0x0100
#define ANLPAR_TXHD 0x0080
#define ANLPAR_10FD 0x0040
#define ANLPAR_10HD 0x0020
#define ANLPAR_PSB 0x0001 /* 802.3 */
#define ANER_PDF 0x0010
#define ANER_LPNPABLE 0x0008
#define ANER_NPABLE 0x0004
#define ANER_PAGERX 0x0002
#define ANER_LPANABLE 0x0001
#define ANNPTR_NP 0x8000
#define ANNPTR_MP 0x2000
#define ANNPTR_ACK2 0x1000
#define ANNPTR_TOGTX 0x0800
#define ANNPTR_CODE 0x0008
#define ANNPRR_NP 0x8000
#define ANNPRR_MP 0x2000
#define ANNPRR_ACK3 0x1000
#define ANNPRR_TOGTX 0x0800
#define ANNPRR_CODE 0x0008
#define K1TCR_TESTMODE 0x0000
#define K1TCR_MSMCE 0x1000
#define K1TCR_MSCV 0x0800
#define K1TCR_RPTR 0x0400
#define K1TCR_1000BT_FDX 0x200
#define K1TCR_1000BT_HDX 0x100
#define K1STSR_MSMCFLT 0x8000
#define K1STSR_MSCFGRES 0x4000
#define K1STSR_LRSTAT 0x2000
#define K1STSR_RRSTAT 0x1000
#define K1STSR_LP1KFD 0x0800
#define K1STSR_LP1KHD 0x0400
#define K1STSR_LPASMDIR 0x0200
#define K1SCR_1KX_FDX 0x8000
#define K1SCR_1KX_HDX 0x4000
#define K1SCR_1KT_FDX 0x2000
#define K1SCR_1KT_HDX 0x1000
#define STRAP_PHY1 0x0800
#define STRAP_NCMODE 0x0400
#define STRAP_MANMSCFG 0x0200
#define STRAP_ANENABLE 0x0100
#define STRAP_MSVAL 0x0080
#define STRAP_1KHDXADV 0x0010
#define STRAP_1KFDXADV 0x0008
#define STRAP_100ADV 0x0004
#define STRAP_SPEEDSEL 0x0000
#define STRAP_SPEED100 0x0001
#define PHYSUP_SPEED1000 0x10
#define PHYSUP_SPEED100 0x08
#define PHYSUP_SPEED10 0x00
#define PHYSUP_LINKUP 0x04
#define PHYSUP_FDX 0x02
#define MII_BMCR 0x00 /* Basic mode control register (rw) */
#define MII_BMSR 0x01 /* Basic mode status register (ro) */
#define MII_K1STSR 0x0A /* 1K Status Register (ro) */
#define MII_ANLPAR 0x05 /* Autonegotiation lnk partner abilities (rw) */
#define M_MAC_MDIO_DIR_OUTPUT 0 /* for clarity */
#define ENABLE 1
#define DISABLE 0
/**********************************************************************
* SBMAC_MII_SYNC(s)
*
* Synchronize with the MII - send a pattern of bits to the MII
* that will guarantee that it is ready to accept a command.
*
* Input parameters:
* s - sbmac structure
*
* Return value:
* nothing
********************************************************************* */
static void sbmac_mii_sync(struct sbmac_softc *s)
{
int cnt;
uint64_t bits;
int mac_mdio_genc;
mac_mdio_genc = SBMAC_READCSR(s->sbm_mdio) & M_MAC_GENC;
bits = M_MAC_MDIO_DIR_OUTPUT | M_MAC_MDIO_OUT;
SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
for (cnt = 0; cnt < 32; cnt++) {
SBMAC_WRITECSR(s->sbm_mdio,bits | M_MAC_MDC | mac_mdio_genc);
SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
}
}
/**********************************************************************
* SBMAC_MII_SENDDATA(s,data,bitcnt)
*
* Send some bits to the MII. The bits to be sent are right-
* justified in the 'data' parameter.
*
* Input parameters:
* s - sbmac structure
* data - data to send
* bitcnt - number of bits to send
********************************************************************* */
static void sbmac_mii_senddata(struct sbmac_softc *s,unsigned int data, int bitcnt)
{
int i;
uint64_t bits;
unsigned int curmask;
int mac_mdio_genc;
mac_mdio_genc = SBMAC_READCSR(s->sbm_mdio) & M_MAC_GENC;
bits = M_MAC_MDIO_DIR_OUTPUT;
SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
curmask = 1 << (bitcnt - 1);
for (i = 0; i < bitcnt; i++) {
if (data & curmask)
bits |= M_MAC_MDIO_OUT;
else bits &= ~M_MAC_MDIO_OUT;
SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
SBMAC_WRITECSR(s->sbm_mdio,bits | M_MAC_MDC | mac_mdio_genc);
SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
curmask >>= 1;
}
}
/**********************************************************************
* SBMAC_MII_READ(s,phyaddr,regidx)
*
* Read a PHY register.
*
* Input parameters:
* s - sbmac structure
* phyaddr - PHY's address
* regidx = index of register to read
*
* Return value:
* value read, or 0 if an error occurred.
********************************************************************* */
static unsigned int sbmac_mii_read(struct sbmac_softc *s,int phyaddr,int regidx)
{
int idx;
int error;
int regval;
int mac_mdio_genc;
/*
* Synchronize ourselves so that the PHY knows the next
* thing coming down is a command
*/
sbmac_mii_sync(s);
/*
* Send the data to the PHY. The sequence is
* a "start" command (2 bits)
* a "read" command (2 bits)
* the PHY addr (5 bits)
* the register index (5 bits)
*/
sbmac_mii_senddata(s,MII_COMMAND_START, 2);
sbmac_mii_senddata(s,MII_COMMAND_READ, 2);
sbmac_mii_senddata(s,phyaddr, 5);
sbmac_mii_senddata(s,regidx, 5);
mac_mdio_genc = SBMAC_READCSR(s->sbm_mdio) & M_MAC_GENC;
/*
* Switch the port around without a clock transition.
*/
SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_INPUT | mac_mdio_genc);
/*
* Send out a clock pulse to signal we want the status
*/
SBMAC_WRITECSR(s->sbm_mdio,
M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc);
SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_INPUT | mac_mdio_genc);
/*
* If an error occurred, the PHY will signal '1' back
*/
error = SBMAC_READCSR(s->sbm_mdio) & M_MAC_MDIO_IN;
/*
* Issue an 'idle' clock pulse, but keep the direction
* the same.
*/
SBMAC_WRITECSR(s->sbm_mdio,
M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc);
SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_INPUT | mac_mdio_genc);
regval = 0;
for (idx = 0; idx < 16; idx++) {
regval <<= 1;
if (error == 0) {
if (SBMAC_READCSR(s->sbm_mdio) & M_MAC_MDIO_IN)
regval |= 1;
}
SBMAC_WRITECSR(s->sbm_mdio,
M_MAC_MDIO_DIR_INPUT|M_MAC_MDC | mac_mdio_genc);
SBMAC_WRITECSR(s->sbm_mdio,
M_MAC_MDIO_DIR_INPUT | mac_mdio_genc);
}
/* Switch back to output */
SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc);
if (error == 0)
return regval;
return 0;
}
/**********************************************************************
* SBMAC_MII_WRITE(s,phyaddr,regidx,regval)
*
* Write a value to a PHY register.
*
* Input parameters:
* s - sbmac structure
* phyaddr - PHY to use
* regidx - register within the PHY
* regval - data to write to register
*
* Return value:
* nothing
********************************************************************* */
static void sbmac_mii_write(struct sbmac_softc *s,int phyaddr,int regidx,
unsigned int regval)
{
int mac_mdio_genc;
sbmac_mii_sync(s);
sbmac_mii_senddata(s,MII_COMMAND_START,2);
sbmac_mii_senddata(s,MII_COMMAND_WRITE,2);
sbmac_mii_senddata(s,phyaddr, 5);
sbmac_mii_senddata(s,regidx, 5);
sbmac_mii_senddata(s,MII_COMMAND_ACK,2);
sbmac_mii_senddata(s,regval,16);
mac_mdio_genc = SBMAC_READCSR(s->sbm_mdio) & M_MAC_GENC;
SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc);
}
/**********************************************************************
* SBDMA_INITCTX(d,s,chan,txrx,maxdescr)
*
* Initialize a DMA channel context. Since there are potentially
* eight DMA channels per MAC, it's nice to do this in a standard
* way.
*
* Input parameters:
* d - sbmacdma_t structure (DMA channel context)
* s - sbmac_softc structure (pointer to a MAC)
* chan - channel number (0..1 right now)
* txrx - Identifies DMA_TX or DMA_RX for channel direction
* maxdescr - number of descriptors
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_initctx(sbmacdma_t *d,
struct sbmac_softc *s,
int chan,
int txrx,
int maxdescr)
{
/*
* Save away interesting stuff in the structure
*/
d->sbdma_eth = s;
d->sbdma_channel = chan;
d->sbdma_txdir = txrx;
#if 0
/* RMON clearing */
s->sbe_idx =(s->sbm_base - A_MAC_BASE_0)/MAC_SPACING;
#endif
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_BYTES)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_COLLISIONS)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_LATE_COL)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_EX_COL)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_FCS_ERROR)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_ABORT)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_BAD)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_GOOD)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_RUNT)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_OVERSIZE)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_BYTES)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_MCAST)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_BCAST)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_BAD)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_GOOD)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_RUNT)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_OVERSIZE)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_FCS_ERROR)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_LENGTH_ERROR)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_CODE_ERROR)), 0);
SBMAC_WRITECSR(IOADDR(
A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_ALIGN_ERROR)), 0);
/*
* initialize register pointers
*/
d->sbdma_config0 =
s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CONFIG0);
d->sbdma_config1 =
s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CONFIG1);
d->sbdma_dscrbase =
s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_BASE);
d->sbdma_dscrcnt =
s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_CNT);
d->sbdma_curdscr =
s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CUR_DSCRADDR);
/*
* Allocate memory for the ring
*/
d->sbdma_maxdescr = maxdescr;
d->sbdma_dscrtable = (sbdmadscr_t *)
kmalloc(d->sbdma_maxdescr*sizeof(sbdmadscr_t), GFP_KERNEL);
memset(d->sbdma_dscrtable,0,d->sbdma_maxdescr*sizeof(sbdmadscr_t));
d->sbdma_dscrtable_end = d->sbdma_dscrtable + d->sbdma_maxdescr;
d->sbdma_dscrtable_phys = virt_to_phys(d->sbdma_dscrtable);
/*
* And context table
*/
d->sbdma_ctxtable = (struct sk_buff **)
kmalloc(d->sbdma_maxdescr*sizeof(struct sk_buff *), GFP_KERNEL);
memset(d->sbdma_ctxtable,0,d->sbdma_maxdescr*sizeof(struct sk_buff *));
#ifdef CONFIG_SBMAC_COALESCE
/*
* Setup Rx/Tx DMA coalescing defaults
*/
if ( int_pktcnt ) {
d->sbdma_int_pktcnt = int_pktcnt;
} else {
d->sbdma_int_pktcnt = 1;
}
if ( int_timeout ) {
d->sbdma_int_timeout = int_timeout;
} else {
d->sbdma_int_timeout = 0;
}
#endif
}
/**********************************************************************
* SBDMA_CHANNEL_START(d)
*
* Initialize the hardware registers for a DMA channel.
*
* Input parameters:
* d - DMA channel to init (context must be previously init'd
* rxtx - DMA_RX or DMA_TX depending on what type of channel
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_channel_start(sbmacdma_t *d, int rxtx )
{
/*
* Turn on the DMA channel
*/
#ifdef CONFIG_SBMAC_COALESCE
SBMAC_WRITECSR(d->sbdma_config1,
V_DMA_INT_TIMEOUT(d->sbdma_int_timeout) |
0);
SBMAC_WRITECSR(d->sbdma_config0,
M_DMA_EOP_INT_EN |
V_DMA_RINGSZ(d->sbdma_maxdescr) |
V_DMA_INT_PKTCNT(d->sbdma_int_pktcnt) |
0);
#else
SBMAC_WRITECSR(d->sbdma_config1,0);
SBMAC_WRITECSR(d->sbdma_config0,
V_DMA_RINGSZ(d->sbdma_maxdescr) |
0);
#endif
SBMAC_WRITECSR(d->sbdma_dscrbase,d->sbdma_dscrtable_phys);
/*
* Initialize ring pointers
*/
d->sbdma_addptr = d->sbdma_dscrtable;
d->sbdma_remptr = d->sbdma_dscrtable;
}
/**********************************************************************
* SBDMA_CHANNEL_STOP(d)
*
* Initialize the hardware registers for a DMA channel.
*
* Input parameters:
* d - DMA channel to init (context must be previously init'd
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_channel_stop(sbmacdma_t *d)
{
/*
* Turn off the DMA channel
*/
SBMAC_WRITECSR(d->sbdma_config1,0);
SBMAC_WRITECSR(d->sbdma_dscrbase,0);
SBMAC_WRITECSR(d->sbdma_config0,0);
/*
* Zero ring pointers
*/
d->sbdma_addptr = 0;
d->sbdma_remptr = 0;
}
static void sbdma_align_skb(struct sk_buff *skb,int power2,int offset)
{
unsigned long addr;
unsigned long newaddr;
addr = (unsigned long) skb->data;
newaddr = (addr + power2 - 1) & ~(power2 - 1);
skb_reserve(skb,newaddr-addr+offset);
}
/**********************************************************************
* SBDMA_ADD_RCVBUFFER(d,sb)
*
* Add a buffer to the specified DMA channel. For receive channels,
* this queues a buffer for inbound packets.
*
* Input parameters:
* d - DMA channel descriptor
* sb - sk_buff to add, or NULL if we should allocate one
*
* Return value:
* 0 if buffer could not be added (ring is full)
* 1 if buffer added successfully
********************************************************************* */
static int sbdma_add_rcvbuffer(sbmacdma_t *d,struct sk_buff *sb)
{
sbdmadscr_t *dsc;
sbdmadscr_t *nextdsc;
struct sk_buff *sb_new = NULL;
int pktsize = ENET_PACKET_SIZE;
/* get pointer to our current place in the ring */
dsc = d->sbdma_addptr;
nextdsc = SBDMA_NEXTBUF(d,sbdma_addptr);
/*
* figure out if the ring is full - if the next descriptor
* is the same as the one that we're going to remove from
* the ring, the ring is full
*/
if (nextdsc == d->sbdma_remptr) {
return -ENOSPC;
}
/*
* Allocate a sk_buff if we don't already have one.
* If we do have an sk_buff, reset it so that it's empty.
*
* Note: sk_buffs don't seem to be guaranteed to have any sort
* of alignment when they are allocated. Therefore, allocate enough
* extra space to make sure that:
*
* 1. the data does not start in the middle of a cache line.
* 2. The data does not end in the middle of a cache line
* 3. The buffer can be aligned such that the IP addresses are
* naturally aligned.
*
* Remember, the SOCs MAC writes whole cache lines at a time,
* without reading the old contents first. So, if the sk_buff's
* data portion starts in the middle of a cache line, the SOC
* DMA will trash the beginning (and ending) portions.
*/
if (sb == NULL) {
sb_new = dev_alloc_skb(ENET_PACKET_SIZE + SMP_CACHE_BYTES * 2 + ETHER_ALIGN);
if (sb_new == NULL) {
printk(KERN_INFO "%s: sk_buff allocation failed\n",
d->sbdma_eth->sbm_dev->name);
return -ENOBUFS;
}
sbdma_align_skb(sb_new, SMP_CACHE_BYTES, ETHER_ALIGN);
/* mark skbuff owned by our device */
sb_new->dev = d->sbdma_eth->sbm_dev;
}
else {
sb_new = sb;
/*
* nothing special to reinit buffer, it's already aligned
* and sb->data already points to a good place.
*/
}
/*
* fill in the descriptor
*/
#ifdef CONFIG_SBMAC_COALESCE
/*
* Do not interrupt per DMA transfer.
*/
dsc->dscr_a = virt_to_phys(sb_new->data) |
V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize+ETHER_ALIGN)) |
0;
#else
dsc->dscr_a = virt_to_phys(sb_new->data) |
V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize+ETHER_ALIGN)) |
M_DMA_DSCRA_INTERRUPT;
#endif
/* receiving: no options */
dsc->dscr_b = 0;
/*
* fill in the context
*/
d->sbdma_ctxtable[dsc-d->sbdma_dscrtable] = sb_new;
/*
* point at next packet
*/
d->sbdma_addptr = nextdsc;
/*
* Give the buffer to the DMA engine.
*/
SBMAC_WRITECSR(d->sbdma_dscrcnt,1);
return 0; /* we did it */
}
/**********************************************************************
* SBDMA_ADD_TXBUFFER(d,sb)
*
* Add a transmit buffer to the specified DMA channel, causing a
* transmit to start.
*
* Input parameters:
* d - DMA channel descriptor
* sb - sk_buff to add
*
* Return value:
* 0 transmit queued successfully
* otherwise error code
********************************************************************* */
static int sbdma_add_txbuffer(sbmacdma_t *d,struct sk_buff *sb)
{
sbdmadscr_t *dsc;
sbdmadscr_t *nextdsc;
uint64_t phys;
uint64_t ncb;
int length;
/* get pointer to our current place in the ring */
dsc = d->sbdma_addptr;
nextdsc = SBDMA_NEXTBUF(d,sbdma_addptr);
/*
* figure out if the ring is full - if the next descriptor
* is the same as the one that we're going to remove from
* the ring, the ring is full
*/
if (nextdsc == d->sbdma_remptr) {
return -ENOSPC;
}
/*
* Under Linux, it's not necessary to copy/coalesce buffers
* like it is on NetBSD. We think they're all contiguous,
* but that may not be true for GBE.
*/
length = sb->len;
/*
* fill in the descriptor. Note that the number of cache
* blocks in the descriptor is the number of blocks
* *spanned*, so we need to add in the offset (if any)
* while doing the calculation.
*/
phys = virt_to_phys(sb->data);
ncb = NUMCACHEBLKS(length+(phys & (SMP_CACHE_BYTES - 1)));
dsc->dscr_a = phys |
V_DMA_DSCRA_A_SIZE(ncb) |
#ifndef CONFIG_SBMAC_COALESCE
M_DMA_DSCRA_INTERRUPT |
#endif
M_DMA_ETHTX_SOP;
/* transmitting: set outbound options and length */
dsc->dscr_b = V_DMA_DSCRB_OPTIONS(K_DMA_ETHTX_APPENDCRC_APPENDPAD) |
V_DMA_DSCRB_PKT_SIZE(length);
/*
* fill in the context
*/
d->sbdma_ctxtable[dsc-d->sbdma_dscrtable] = sb;
/*
* point at next packet
*/
d->sbdma_addptr = nextdsc;
/*
* Give the buffer to the DMA engine.
*/
SBMAC_WRITECSR(d->sbdma_dscrcnt,1);
return 0; /* we did it */
}
/**********************************************************************
* SBDMA_EMPTYRING(d)
*
* Free all allocated sk_buffs on the specified DMA channel;
*
* Input parameters:
* d - DMA channel
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_emptyring(sbmacdma_t *d)
{
int idx;
struct sk_buff *sb;
for (idx = 0; idx < d->sbdma_maxdescr; idx++) {
sb = d->sbdma_ctxtable[idx];
if (sb) {
dev_kfree_skb(sb);
d->sbdma_ctxtable[idx] = NULL;
}
}
}
/**********************************************************************
* SBDMA_FILLRING(d)
*
* Fill the specified DMA channel (must be receive channel)
* with sk_buffs
*
* Input parameters:
* d - DMA channel
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_fillring(sbmacdma_t *d)
{
int idx;
for (idx = 0; idx < SBMAC_MAX_RXDESCR-1; idx++) {
if (sbdma_add_rcvbuffer(d,NULL) != 0)
break;
}
}
/**********************************************************************
* SBDMA_RX_PROCESS(sc,d)
*
* Process "completed" receive buffers on the specified DMA channel.
* Note that this isn't really ideal for priority channels, since
* it processes all of the packets on a given channel before
* returning.
*
* Input parameters:
* sc - softc structure
* d - DMA channel context
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
{
int curidx;
int hwidx;
sbdmadscr_t *dsc;
struct sk_buff *sb;
int len;
for (;;) {
/*
* figure out where we are (as an index) and where
* the hardware is (also as an index)
*
* This could be done faster if (for example) the
* descriptor table was page-aligned and contiguous in
* both virtual and physical memory -- you could then
* just compare the low-order bits of the virtual address
* (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
*/
curidx = d->sbdma_remptr - d->sbdma_dscrtable;
hwidx = (int) (((SBMAC_READCSR(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));
/*
* If they're the same, that means we've processed all
* of the descriptors up to (but not including) the one that
* the hardware is working on right now.
*/
if (curidx == hwidx)
break;
/*
* Otherwise, get the packet's sk_buff ptr back
*/
dsc = &(d->sbdma_dscrtable[curidx]);
sb = d->sbdma_ctxtable[curidx];
d->sbdma_ctxtable[curidx] = NULL;
len = (int)G_DMA_DSCRB_PKT_SIZE(dsc->dscr_b) - 4;
/*
* Check packet status. If good, process it.
* If not, silently drop it and put it back on the
* receive ring.
*/
if (!(dsc->dscr_a & M_DMA_ETHRX_BAD)) {
/*
* Add a new buffer to replace the old one. If we fail
* to allocate a buffer, we're going to drop this
* packet and put it right back on the receive ring.
*/
if (sbdma_add_rcvbuffer(d,NULL) == -ENOBUFS) {
sc->sbm_stats.rx_dropped++;
sbdma_add_rcvbuffer(d,sb); /* re-add old buffer */
} else {
/*
* Set length into the packet
*/
skb_put(sb,len);
/*
* Buffer has been replaced on the
* receive ring. Pass the buffer to
* the kernel
*/
sc->sbm_stats.rx_bytes += len;
sc->sbm_stats.rx_packets++;
sb->protocol = eth_type_trans(sb,d->sbdma_eth->sbm_dev);
/* Check hw IPv4/TCP checksum if supported */
if (sc->rx_hw_checksum == ENABLE) {
if (!((dsc->dscr_a) & M_DMA_ETHRX_BADIP4CS) &&
!((dsc->dscr_a) & M_DMA_ETHRX_BADTCPCS)) {
sb->ip_summed = CHECKSUM_UNNECESSARY;
/* don't need to set sb->csum */
} else {
sb->ip_summed = CHECKSUM_NONE;
}
}
netif_rx(sb);
}
} else {
/*
* Packet was mangled somehow. Just drop it and
* put it back on the receive ring.
*/
sc->sbm_stats.rx_errors++;
sbdma_add_rcvbuffer(d,sb);
}
/*
* .. and advance to the next buffer.
*/
d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
}
}
/**********************************************************************
* SBDMA_TX_PROCESS(sc,d)
*
* Process "completed" transmit buffers on the specified DMA channel.
* This is normally called within the interrupt service routine.
* Note that this isn't really ideal for priority channels, since
* it processes all of the packets on a given channel before
* returning.
*
* Input parameters:
* sc - softc structure
* d - DMA channel context
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d)
{
int curidx;
int hwidx;
sbdmadscr_t *dsc;
struct sk_buff *sb;
unsigned long flags;
spin_lock_irqsave(&(sc->sbm_lock), flags);
for (;;) {
/*
* figure out where we are (as an index) and where
* the hardware is (also as an index)
*
* This could be done faster if (for example) the
* descriptor table was page-aligned and contiguous in
* both virtual and physical memory -- you could then
* just compare the low-order bits of the virtual address
* (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
*/
curidx = d->sbdma_remptr - d->sbdma_dscrtable;
hwidx = (int) (((SBMAC_READCSR(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));
/*
* If they're the same, that means we've processed all
* of the descriptors up to (but not including) the one that
* the hardware is working on right now.
*/
if (curidx == hwidx)
break;
/*
* Otherwise, get the packet's sk_buff ptr back
*/
dsc = &(d->sbdma_dscrtable[curidx]);
sb = d->sbdma_ctxtable[curidx];
d->sbdma_ctxtable[curidx] = NULL;
/*
* Stats
*/
sc->sbm_stats.tx_bytes += sb->len;
sc->sbm_stats.tx_packets++;
/*
* for transmits, we just free buffers.
*/
dev_kfree_skb_irq(sb);
/*
* .. and advance to the next buffer.
*/
d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
}
/*
* Decide if we should wake up the protocol or not.
* Other drivers seem to do this when we reach a low
* watermark on the transmit queue.
*/
netif_wake_queue(d->sbdma_eth->sbm_dev);
spin_unlock_irqrestore(&(sc->sbm_lock), flags);
}
/**********************************************************************
* SBMAC_INITCTX(s)
*
* Initialize an Ethernet context structure - this is called
* once per MAC on the 1250. Memory is allocated here, so don't
* call it again from inside the ioctl routines that bring the
* interface up/down
*
* Input parameters:
* s - sbmac context structure
*
* Return value:
* 0
********************************************************************* */
static int sbmac_initctx(struct sbmac_softc *s)
{
/*
* figure out the addresses of some ports
*/
s->sbm_macenable = s->sbm_base + R_MAC_ENABLE;
s->sbm_maccfg = s->sbm_base + R_MAC_CFG;
s->sbm_fifocfg = s->sbm_base + R_MAC_THRSH_CFG;
s->sbm_framecfg = s->sbm_base + R_MAC_FRAMECFG;
s->sbm_rxfilter = s->sbm_base + R_MAC_ADFILTER_CFG;
s->sbm_isr = s->sbm_base + R_MAC_STATUS;
s->sbm_imr = s->sbm_base + R_MAC_INT_MASK;
s->sbm_mdio = s->sbm_base + R_MAC_MDIO;
s->sbm_phys[0] = 1;
s->sbm_phys[1] = 0;
s->sbm_phy_oldbmsr = 0;
s->sbm_phy_oldanlpar = 0;
s->sbm_phy_oldk1stsr = 0;
s->sbm_phy_oldlinkstat = 0;
/*
* Initialize the DMA channels. Right now, only one per MAC is used
* Note: Only do this _once_, as it allocates memory from the kernel!
*/
sbdma_initctx(&(s->sbm_txdma),s,0,DMA_TX,SBMAC_MAX_TXDESCR);
sbdma_initctx(&(s->sbm_rxdma),s,0,DMA_RX,SBMAC_MAX_RXDESCR);
/*
* initial state is OFF
*/
s->sbm_state = sbmac_state_off;
/*
* Initial speed is (XXX TEMP) 10MBit/s HDX no FC
*/
s->sbm_speed = sbmac_speed_10;
s->sbm_duplex = sbmac_duplex_half;
s->sbm_fc = sbmac_fc_disabled;
return 0;
}
static void sbdma_uninitctx(struct sbmacdma_s *d)
{
if (d->sbdma_dscrtable) {
kfree(d->sbdma_dscrtable);
d->sbdma_dscrtable = NULL;
}
if (d->sbdma_ctxtable) {
kfree(d->sbdma_ctxtable);
d->sbdma_ctxtable = NULL;
}
}
static void sbmac_uninitctx(struct sbmac_softc *sc)
{
sbdma_uninitctx(&(sc->sbm_txdma));
sbdma_uninitctx(&(sc->sbm_rxdma));
}
/**********************************************************************
* SBMAC_CHANNEL_START(s)
*
* Start packet processing on this MAC.
*
* Input parameters:
* s - sbmac structure
*
* Return value:
* nothing
********************************************************************* */
static void sbmac_channel_start(struct sbmac_softc *s)
{
uint64_t reg;
sbmac_port_t port;
uint64_t cfg,fifo,framecfg;
int idx, th_value;
/*
* Don't do this if running
*/
if (s->sbm_state == sbmac_state_on)
return;
/*
* Bring the controller out of reset, but leave it off.
*/
SBMAC_WRITECSR(s->sbm_macenable,0);
/*
* Ignore all received packets
*/
SBMAC_WRITECSR(s->sbm_rxfilter,0);
/*
* Calculate values for various control registers.
*/
cfg = M_MAC_RETRY_EN |
M_MAC_TX_HOLD_SOP_EN |
V_MAC_TX_PAUSE_CNT_16K |
M_MAC_AP_STAT_EN |
M_MAC_FAST_SYNC |
M_MAC_SS_EN |
0;
/*
* Be sure that RD_THRSH+WR_THRSH <= 32 for pass1 pars
* and make sure that RD_THRSH + WR_THRSH <=128 for pass2 and above
* Use a larger RD_THRSH for gigabit
*/
if (periph_rev >= 2)
th_value = 64;
else
th_value = 28;
fifo = V_MAC_TX_WR_THRSH(4) | /* Must be '4' or '8' */
((s->sbm_speed == sbmac_speed_1000)
? V_MAC_TX_RD_THRSH(th_value) : V_MAC_TX_RD_THRSH(4)) |
V_MAC_TX_RL_THRSH(4) |
V_MAC_RX_PL_THRSH(4) |
V_MAC_RX_RD_THRSH(4) | /* Must be '4' */
V_MAC_RX_PL_THRSH(4) |
V_MAC_RX_RL_THRSH(8) |
0;
framecfg = V_MAC_MIN_FRAMESZ_DEFAULT |
V_MAC_MAX_FRAMESZ_DEFAULT |
V_MAC_BACKOFF_SEL(1);
/*
* Clear out the hash address map
*/
port = s->sbm_base + R_MAC_HASH_BASE;
for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
SBMAC_WRITECSR(port,0);
port += sizeof(uint64_t);
}
/*
* Clear out the exact-match table
*/
port = s->sbm_base + R_MAC_ADDR_BASE;
for (idx = 0; idx < MAC_ADDR_COUNT; idx++) {
SBMAC_WRITECSR(port,0);
port += sizeof(uint64_t);
}
/*
* Clear out the DMA Channel mapping table registers
*/
port = s->sbm_base + R_MAC_CHUP0_BASE;
for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
SBMAC_WRITECSR(port,0);
port += sizeof(uint64_t);
}
port = s->sbm_base + R_MAC_CHLO0_BASE;
for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
SBMAC_WRITECSR(port,0);
port += sizeof(uint64_t);
}
/*
* Program the hardware address. It goes into the hardware-address
* register as well as the first filter register.
*/
reg = sbmac_addr2reg(s->sbm_hwaddr);
port = s->sbm_base + R_MAC_ADDR_BASE;
SBMAC_WRITECSR(port,reg);
port = s->sbm_base + R_MAC_ETHERNET_ADDR;
#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
/*
* Pass1 SOCs do not receive packets addressed to the
* destination address in the R_MAC_ETHERNET_ADDR register.
* Set the value to zero.
*/
SBMAC_WRITECSR(port,0);
#else
SBMAC_WRITECSR(port,reg);
#endif
/*
* Set the receive filter for no packets, and write values
* to the various config registers
*/
SBMAC_WRITECSR(s->sbm_rxfilter,0);
SBMAC_WRITECSR(s->sbm_imr,0);
SBMAC_WRITECSR(s->sbm_framecfg,framecfg);
SBMAC_WRITECSR(s->sbm_fifocfg,fifo);
SBMAC_WRITECSR(s->sbm_maccfg,cfg);
/*
* Initialize DMA channels (rings should be ok now)
*/
sbdma_channel_start(&(s->sbm_rxdma), DMA_RX);
sbdma_channel_start(&(s->sbm_txdma), DMA_TX);
/*
* Configure the speed, duplex, and flow control
*/
sbmac_set_speed(s,s->sbm_speed);
sbmac_set_duplex(s,s->sbm_duplex,s->sbm_fc);
/*
* Fill the receive ring
*/
sbdma_fillring(&(s->sbm_rxdma));
/*
* Turn on the rest of the bits in the enable register
*/
SBMAC_WRITECSR(s->sbm_macenable,
M_MAC_RXDMA_EN0 |
M_MAC_TXDMA_EN0 |
M_MAC_RX_ENABLE |
M_MAC_TX_ENABLE);
#ifdef CONFIG_SBMAC_COALESCE
/*
* Accept any TX interrupt and EOP count/timer RX interrupts on ch 0
*/
SBMAC_WRITECSR(s->sbm_imr,
((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0));
#else
/*
* Accept any kind of interrupt on TX and RX DMA channel 0
*/
SBMAC_WRITECSR(s->sbm_imr,
(M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
(M_MAC_INT_CHANNEL << S_MAC_RX_CH0));
#endif
/*
* Enable receiving unicasts and broadcasts
*/
SBMAC_WRITECSR(s->sbm_rxfilter,M_MAC_UCAST_EN | M_MAC_BCAST_EN);
/*
* we're running now.
*/
s->sbm_state = sbmac_state_on;
/*
* Program multicast addresses
*/
sbmac_setmulti(s);
/*
* If channel was in promiscuous mode before, turn that on
*/
if (s->sbm_devflags & IFF_PROMISC) {
sbmac_promiscuous_mode(s,1);
}
}
/**********************************************************************
* SBMAC_CHANNEL_STOP(s)
*
* Stop packet processing on this MAC.
*
* Input parameters:
* s - sbmac structure
*
* Return value:
* nothing
********************************************************************* */
static void sbmac_channel_stop(struct sbmac_softc *s)
{
/* don't do this if already stopped */
if (s->sbm_state == sbmac_state_off)
return;
/* don't accept any packets, disable all interrupts */
SBMAC_WRITECSR(s->sbm_rxfilter,0);
SBMAC_WRITECSR(s->sbm_imr,0);
/* Turn off ticker */
/* XXX */
/* turn off receiver and transmitter */
SBMAC_WRITECSR(s->sbm_macenable,0);
/* We're stopped now. */
s->sbm_state = sbmac_state_off;
/*
* Stop DMA channels (rings should be ok now)
*/
sbdma_channel_stop(&(s->sbm_rxdma));
sbdma_channel_stop(&(s->sbm_txdma));
/* Empty the receive and transmit rings */
sbdma_emptyring(&(s->sbm_rxdma));
sbdma_emptyring(&(s->sbm_txdma));
}
/**********************************************************************
* SBMAC_SET_CHANNEL_STATE(state)
*
* Set the channel's state ON or OFF
*
* Input parameters:
* state - new state
*
* Return value:
* old state
********************************************************************* */
static sbmac_state_t sbmac_set_channel_state(struct sbmac_softc *sc,
sbmac_state_t state)
{
sbmac_state_t oldstate = sc->sbm_state;
/*
* If same as previous state, return
*/
if (state == oldstate) {
return oldstate;
}
/*
* If new state is ON, turn channel on
*/
if (state == sbmac_state_on) {
sbmac_channel_start(sc);
}
else {
sbmac_channel_stop(sc);
}
/*
* Return previous state
*/
return oldstate;
}
/**********************************************************************
* SBMAC_PROMISCUOUS_MODE(sc,onoff)
*
* Turn on or off promiscuous mode
*
* Input parameters:
* sc - softc
* onoff - 1 to turn on, 0 to turn off
*
* Return value:
* nothing
********************************************************************* */
static void sbmac_promiscuous_mode(struct sbmac_softc *sc,int onoff)
{
uint64_t reg;
if (sc->sbm_state != sbmac_state_on)
return;
if (onoff) {
reg = SBMAC_READCSR(sc->sbm_rxfilter);
reg |= M_MAC_ALLPKT_EN;
SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
}
else {
reg = SBMAC_READCSR(sc->sbm_rxfilter);
reg &= ~M_MAC_ALLPKT_EN;
SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
}
}
/**********************************************************************
* SBMAC_SETIPHDR_OFFSET(sc,onoff)
*
* Set the iphdr offset as 15 assuming ethernet encapsulation
*
* Input parameters:
* sc - softc
*
* Return value:
* nothing
********************************************************************* */
static void sbmac_set_iphdr_offset(struct sbmac_softc *sc)
{
uint64_t reg;
/* Hard code the off set to 15 for now */
reg = SBMAC_READCSR(sc->sbm_rxfilter);
reg &= ~M_MAC_IPHDR_OFFSET | V_MAC_IPHDR_OFFSET(15);
SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
/* read system identification to determine revision */
if (periph_rev >= 2) {
sc->rx_hw_checksum = ENABLE;
} else {
sc->rx_hw_checksum = DISABLE;
}
}
/**********************************************************************
* SBMAC_ADDR2REG(ptr)
*
* Convert six bytes into the 64-bit register value that
* we typically write into the SBMAC's address/mcast registers
*
* Input parameters:
* ptr - pointer to 6 bytes
*
* Return value:
* register value
********************************************************************* */
static uint64_t sbmac_addr2reg(unsigned char *ptr)
{
uint64_t reg = 0;
ptr += 6;
reg |= (uint64_t) *(--ptr);
reg <<= 8;
reg |= (uint64_t) *(--ptr);
reg <<= 8;
reg |= (uint64_t) *(--ptr);
reg <<= 8;
reg |= (uint64_t) *(--ptr);
reg <<= 8;
reg |= (uint64_t) *(--ptr);
reg <<= 8;
reg |= (uint64_t) *(--ptr);
return reg;
}
/**********************************************************************
* SBMAC_SET_SPEED(s,speed)
*
* Configure LAN speed for the specified MAC.
* Warning: must be called when MAC is off!
*
* Input parameters:
* s - sbmac structure
* speed - speed to set MAC to (see sbmac_speed_t enum)
*
* Return value:
* 1 if successful
* 0 indicates invalid parameters
********************************************************************* */
static int sbmac_set_speed(struct sbmac_softc *s,sbmac_speed_t speed)
{
uint64_t cfg;
uint64_t framecfg;
/*
* Save new current values
*/
s->sbm_speed = speed;
if (s->sbm_state == sbmac_state_on)
return 0; /* save for next restart */
/*
* Read current register values
*/
cfg = SBMAC_READCSR(s->sbm_maccfg);
framecfg = SBMAC_READCSR(s->sbm_framecfg);
/*
* Mask out the stuff we want to change
*/
cfg &= ~(M_MAC_BURST_EN | M_MAC_SPEED_SEL);
framecfg &= ~(M_MAC_IFG_RX | M_MAC_IFG_TX | M_MAC_IFG_THRSH |
M_MAC_SLOT_SIZE);
/*
* Now add in the new bits
*/
switch (speed) {
case sbmac_speed_10:
framecfg |= V_MAC_IFG_RX_10 |
V_MAC_IFG_TX_10 |
K_MAC_IFG_THRSH_10 |
V_MAC_SLOT_SIZE_10;
cfg |= V_MAC_SPEED_SEL_10MBPS;
break;
case sbmac_speed_100:
framecfg |= V_MAC_IFG_RX_100 |
V_MAC_IFG_TX_100 |
V_MAC_IFG_THRSH_100 |
V_MAC_SLOT_SIZE_100;
cfg |= V_MAC_SPEED_SEL_100MBPS ;
break;
case sbmac_speed_1000:
framecfg |= V_MAC_IFG_RX_1000 |
V_MAC_IFG_TX_1000 |
V_MAC_IFG_THRSH_1000 |
V_MAC_SLOT_SIZE_1000;
cfg |= V_MAC_SPEED_SEL_1000MBPS | M_MAC_BURST_EN;
break;
case sbmac_speed_auto: /* XXX not implemented */
/* fall through */
default:
return 0;
}
/*
* Send the bits back to the hardware
*/
SBMAC_WRITECSR(s->sbm_framecfg,framecfg);
SBMAC_WRITECSR(s->sbm_maccfg,cfg);
return 1;
}
/**********************************************************************
* SBMAC_SET_DUPLEX(s,duplex,fc)
*
* Set Ethernet duplex and flow control options for this MAC
* Warning: must be called when MAC is off!
*
* Input parameters:
* s - sbmac structure
* duplex - duplex setting (see sbmac_duplex_t)
* fc - flow control setting (see sbmac_fc_t)
*
* Return value:
* 1 if ok
* 0 if an invalid parameter combination was specified
********************************************************************* */
static int sbmac_set_duplex(struct sbmac_softc *s,sbmac_duplex_t duplex,sbmac_fc_t fc)
{
uint64_t cfg;
/*
* Save new current values
*/
s->sbm_duplex = duplex;
s->sbm_fc = fc;
if (s->sbm_state == sbmac_state_on)
return 0; /* save for next restart */
/*
* Read current register values
*/
cfg = SBMAC_READCSR(s->sbm_maccfg);
/*
* Mask off the stuff we're about to change
*/
cfg &= ~(M_MAC_FC_SEL | M_MAC_FC_CMD | M_MAC_HDX_EN);
switch (duplex) {
case sbmac_duplex_half:
switch (fc) {
case sbmac_fc_disabled:
cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_DISABLED;
break;
case sbmac_fc_collision:
cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_ENABLED;
break;
case sbmac_fc_carrier:
cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_ENAB_FALSECARR;
break;
case sbmac_fc_auto: /* XXX not implemented */
/* fall through */
case sbmac_fc_frame: /* not valid in half duplex */
default: /* invalid selection */
return 0;
}
break;
case sbmac_duplex_full:
switch (fc) {
case sbmac_fc_disabled:
cfg |= V_MAC_FC_CMD_DISABLED;
break;
case sbmac_fc_frame:
cfg |= V_MAC_FC_CMD_ENABLED;
break;
case sbmac_fc_collision: /* not valid in full duplex */
case sbmac_fc_carrier: /* not valid in full duplex */
case sbmac_fc_auto: /* XXX not implemented */
/* fall through */
default:
return 0;
}
break;
case sbmac_duplex_auto:
/* XXX not implemented */
break;
}
/*
* Send the bits back to the hardware
*/
SBMAC_WRITECSR(s->sbm_maccfg,cfg);
return 1;
}
/**********************************************************************
* SBMAC_INTR()
*
* Interrupt handler for MAC interrupts
*
* Input parameters:
* MAC structure
*
* Return value:
* nothing
********************************************************************* */
static irqreturn_t sbmac_intr(int irq,void *dev_instance,struct pt_regs *rgs)
{
struct net_device *dev = (struct net_device *) dev_instance;
struct sbmac_softc *sc = netdev_priv(dev);
uint64_t isr;
int handled = 0;
for (;;) {
/*
* Read the ISR (this clears the bits in the real
* register, except for counter addr)
*/
isr = SBMAC_READCSR(sc->sbm_isr) & ~M_MAC_COUNTER_ADDR;
if (isr == 0)
break;
handled = 1;
/*
* Transmits on channel 0
*/
if (isr & (M_MAC_INT_CHANNEL << S_MAC_TX_CH0)) {
sbdma_tx_process(sc,&(sc->sbm_txdma));
}
/*
* Receives on channel 0
*/
/*
* It's important to test all the bits (or at least the
* EOP_SEEN bit) when deciding to do the RX process
* particularly when coalescing, to make sure we
* take care of the following:
*
* If you have some packets waiting (have been received
* but no interrupt) and get a TX interrupt before
* the RX timer or counter expires, reading the ISR
* above will clear the timer and counter, and you
* won't get another interrupt until a packet shows
* up to start the timer again. Testing
* EOP_SEEN here takes care of this case.
* (EOP_SEEN is part of M_MAC_INT_CHANNEL << S_MAC_RX_CH0)
*/
if (isr & (M_MAC_INT_CHANNEL << S_MAC_RX_CH0)) {
sbdma_rx_process(sc,&(sc->sbm_rxdma));
}
}
return IRQ_RETVAL(handled);
}
/**********************************************************************
* SBMAC_START_TX(skb,dev)
*
* Start output on the specified interface. Basically, we
* queue as many buffers as we can until the ring fills up, or
* we run off the end of the queue, whichever comes first.
*
* Input parameters:
*
*
* Return value:
* nothing
********************************************************************* */
static int sbmac_start_tx(struct sk_buff *skb, struct net_device *dev)
{
struct sbmac_softc *sc = netdev_priv(dev);
/* lock eth irq */
spin_lock_irq (&sc->sbm_lock);
/*
* Put the buffer on the transmit ring. If we
* don't have room, stop the queue.
*/
if (sbdma_add_txbuffer(&(sc->sbm_txdma),skb)) {
/* XXX save skb that we could not send */
netif_stop_queue(dev);
spin_unlock_irq(&sc->sbm_lock);
return 1;
}
dev->trans_start = jiffies;
spin_unlock_irq (&sc->sbm_lock);
return 0;
}
/**********************************************************************
* SBMAC_SETMULTI(sc)
*
* Reprogram the multicast table into the hardware, given
* the list of multicasts associated with the interface
* structure.
*
* Input parameters:
* sc - softc
*
* Return value:
* nothing
********************************************************************* */
static void sbmac_setmulti(struct sbmac_softc *sc)
{
uint64_t reg;
sbmac_port_t port;
int idx;
struct dev_mc_list *mclist;
struct net_device *dev = sc->sbm_dev;
/*
* Clear out entire multicast table. We do this by nuking
* the entire hash table and all the direct matches except
* the first one, which is used for our station address
*/
for (idx = 1; idx < MAC_ADDR_COUNT; idx++) {
port = sc->sbm_base + R_MAC_ADDR_BASE+(idx*sizeof(uint64_t));
SBMAC_WRITECSR(port,0);
}
for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
port = sc->sbm_base + R_MAC_HASH_BASE+(idx*sizeof(uint64_t));
SBMAC_WRITECSR(port,0);
}
/*
* Clear the filter to say we don't want any multicasts.
*/
reg = SBMAC_READCSR(sc->sbm_rxfilter);
reg &= ~(M_MAC_MCAST_INV | M_MAC_MCAST_EN);
SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
if (dev->flags & IFF_ALLMULTI) {
/*
* Enable ALL multicasts. Do this by inverting the
* multicast enable bit.
*/
reg = SBMAC_READCSR(sc->sbm_rxfilter);
reg |= (M_MAC_MCAST_INV | M_MAC_MCAST_EN);
SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
return;
}
/*
* Progam new multicast entries. For now, only use the
* perfect filter. In the future we'll need to use the
* hash filter if the perfect filter overflows
*/
/* XXX only using perfect filter for now, need to use hash
* XXX if the table overflows */
idx = 1; /* skip station address */
mclist = dev->mc_list;
while (mclist && (idx < MAC_ADDR_COUNT)) {
reg = sbmac_addr2reg(mclist->dmi_addr);
port = sc->sbm_base + R_MAC_ADDR_BASE+(idx * sizeof(uint64_t));
SBMAC_WRITECSR(port,reg);
idx++;
mclist = mclist->next;
}
/*
* Enable the "accept multicast bits" if we programmed at least one
* multicast.
*/
if (idx > 1) {
reg = SBMAC_READCSR(sc->sbm_rxfilter);
reg |= M_MAC_MCAST_EN;
SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
}
}
#if defined(SBMAC_ETH0_HWADDR) || defined(SBMAC_ETH1_HWADDR) || defined(SBMAC_ETH2_HWADDR)
/**********************************************************************
* SBMAC_PARSE_XDIGIT(str)
*
* Parse a hex digit, returning its value
*
* Input parameters:
* str - character
*
* Return value:
* hex value, or -1 if invalid
********************************************************************* */
static int sbmac_parse_xdigit(char str)
{
int digit;
if ((str >= '0') && (str <= '9'))
digit = str - '0';
else if ((str >= 'a') && (str <= 'f'))
digit = str - 'a' + 10;
else if ((str >= 'A') && (str <= 'F'))
digit = str - 'A' + 10;
else
return -1;
return digit;
}
/**********************************************************************
* SBMAC_PARSE_HWADDR(str,hwaddr)
*
* Convert a string in the form xx:xx:xx:xx:xx:xx into a 6-byte
* Ethernet address.
*
* Input parameters:
* str - string
* hwaddr - pointer to hardware address
*
* Return value:
* 0 if ok, else -1
********************************************************************* */
static int sbmac_parse_hwaddr(char *str, unsigned char *hwaddr)
{
int digit1,digit2;
int idx = 6;
while (*str && (idx > 0)) {
digit1 = sbmac_parse_xdigit(*str);
if (digit1 < 0)
return -1;
str++;
if (!*str)
return -1;
if ((*str == ':') || (*str == '-')) {
digit2 = digit1;
digit1 = 0;
}
else {
digit2 = sbmac_parse_xdigit(*str);
if (digit2 < 0)
return -1;
str++;
}
*hwaddr++ = (digit1 << 4) | digit2;
idx--;
if (*str == '-')
str++;
if (*str == ':')
str++;
}
return 0;
}
#endif
static int sb1250_change_mtu(struct net_device *_dev, int new_mtu)
{
if (new_mtu > ENET_PACKET_SIZE)
return -EINVAL;
_dev->mtu = new_mtu;
printk(KERN_INFO "changing the mtu to %d\n", new_mtu);
return 0;
}
/**********************************************************************
* SBMAC_INIT(dev)
*
* Attach routine - init hardware and hook ourselves into linux
*
* Input parameters:
* dev - net_device structure
*
* Return value:
* status
********************************************************************* */
static int sbmac_init(struct net_device *dev, int idx)
{
struct sbmac_softc *sc;
unsigned char *eaddr;
uint64_t ea_reg;
int i;
int err;
sc = netdev_priv(dev);
/* Determine controller base address */
sc->sbm_base = IOADDR(dev->base_addr);
sc->sbm_dev = dev;
sc->sbe_idx = idx;
eaddr = sc->sbm_hwaddr;
/*
* Read the ethernet address. The firwmare left this programmed
* for us in the ethernet address register for each mac.
*/
ea_reg = SBMAC_READCSR(sc->sbm_base + R_MAC_ETHERNET_ADDR);
SBMAC_WRITECSR(sc->sbm_base + R_MAC_ETHERNET_ADDR, 0);
for (i = 0; i < 6; i++) {
eaddr[i] = (uint8_t) (ea_reg & 0xFF);
ea_reg >>= 8;
}
for (i = 0; i < 6; i++) {
dev->dev_addr[i] = eaddr[i];
}
/*
* Init packet size
*/
sc->sbm_buffersize = ENET_PACKET_SIZE + SMP_CACHE_BYTES * 2 + ETHER_ALIGN;
/*
* Initialize context (get pointers to registers and stuff), then
* allocate the memory for the descriptor tables.
*/
sbmac_initctx(sc);
/*
* Set up Linux device callins
*/
spin_lock_init(&(sc->sbm_lock));
dev->open = sbmac_open;
dev->hard_start_xmit = sbmac_start_tx;
dev->stop = sbmac_close;
dev->get_stats = sbmac_get_stats;
dev->set_multicast_list = sbmac_set_rx_mode;
dev->do_ioctl = sbmac_mii_ioctl;
dev->tx_timeout = sbmac_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
dev->change_mtu = sb1250_change_mtu;
/* This is needed for PASS2 for Rx H/W checksum feature */
sbmac_set_iphdr_offset(sc);
err = register_netdev(dev);
if (err)
goto out_uninit;
if (periph_rev >= 2) {
printk(KERN_INFO "%s: enabling TCP rcv checksum\n",
sc->sbm_dev->name);
}
/*
* Display Ethernet address (this is called during the config
* process so we need to finish off the config message that
* was being displayed)
*/
printk(KERN_INFO
"%s: SiByte Ethernet at 0x%08lX, address: %02X:%02X:%02X:%02X:%02X:%02X\n",
dev->name, dev->base_addr,
eaddr[0],eaddr[1],eaddr[2],eaddr[3],eaddr[4],eaddr[5]);
return 0;
out_uninit:
sbmac_uninitctx(sc);
return err;
}
static int sbmac_open(struct net_device *dev)
{
struct sbmac_softc *sc = netdev_priv(dev);
if (debug > 1) {
printk(KERN_DEBUG "%s: sbmac_open() irq %d.\n", dev->name, dev->irq);
}
/*
* map/route interrupt (clear status first, in case something
* weird is pending; we haven't initialized the mac registers
* yet)
*/
SBMAC_READCSR(sc->sbm_isr);
if (request_irq(dev->irq, &sbmac_intr, SA_SHIRQ, dev->name, dev))
return -EBUSY;
/*
* Configure default speed
*/
sbmac_mii_poll(sc,noisy_mii);
/*
* Turn on the channel
*/
sbmac_set_channel_state(sc,sbmac_state_on);
/*
* XXX Station address is in dev->dev_addr
*/
if (dev->if_port == 0)
dev->if_port = 0;
netif_start_queue(dev);
sbmac_set_rx_mode(dev);
/* Set the timer to check for link beat. */
init_timer(&sc->sbm_timer);
sc->sbm_timer.expires = jiffies + 2 * HZ/100;
sc->sbm_timer.data = (unsigned long)dev;
sc->sbm_timer.function = &sbmac_timer;
add_timer(&sc->sbm_timer);
return 0;
}
static int sbmac_mii_poll(struct sbmac_softc *s,int noisy)
{
int bmsr,bmcr,k1stsr,anlpar;
int chg;
char buffer[100];
char *p = buffer;
/* Read the mode status and mode control registers. */
bmsr = sbmac_mii_read(s,s->sbm_phys[0],MII_BMSR);
bmcr = sbmac_mii_read(s,s->sbm_phys[0],MII_BMCR);
/* get the link partner status */
anlpar = sbmac_mii_read(s,s->sbm_phys[0],MII_ANLPAR);
/* if supported, read the 1000baseT register */
if (bmsr & BMSR_1000BT_XSR) {
k1stsr = sbmac_mii_read(s,s->sbm_phys[0],MII_K1STSR);
}
else {
k1stsr = 0;
}
chg = 0;
if ((bmsr & BMSR_LINKSTAT) == 0) {
/*
* If link status is down, clear out old info so that when
* it comes back up it will force us to reconfigure speed
*/
s->sbm_phy_oldbmsr = 0;
s->sbm_phy_oldanlpar = 0;
s->sbm_phy_oldk1stsr = 0;
return 0;
}
if ((s->sbm_phy_oldbmsr != bmsr) ||
(s->sbm_phy_oldanlpar != anlpar) ||
(s->sbm_phy_oldk1stsr != k1stsr)) {
if (debug > 1) {
printk(KERN_DEBUG "%s: bmsr:%x/%x anlpar:%x/%x k1stsr:%x/%x\n",
s->sbm_dev->name,
s->sbm_phy_oldbmsr,bmsr,
s->sbm_phy_oldanlpar,anlpar,
s->sbm_phy_oldk1stsr,k1stsr);
}
s->sbm_phy_oldbmsr = bmsr;
s->sbm_phy_oldanlpar = anlpar;
s->sbm_phy_oldk1stsr = k1stsr;
chg = 1;
}
if (chg == 0)
return 0;
p += sprintf(p,"Link speed: ");
if (k1stsr & K1STSR_LP1KFD) {
s->sbm_speed = sbmac_speed_1000;
s->sbm_duplex = sbmac_duplex_full;
s->sbm_fc = sbmac_fc_frame;
p += sprintf(p,"1000BaseT FDX");
}
else if (k1stsr & K1STSR_LP1KHD) {
s->sbm_speed = sbmac_speed_1000;
s->sbm_duplex = sbmac_duplex_half;
s->sbm_fc = sbmac_fc_disabled;
p += sprintf(p,"1000BaseT HDX");
}
else if (anlpar & ANLPAR_TXFD) {
s->sbm_speed = sbmac_speed_100;
s->sbm_duplex = sbmac_duplex_full;
s->sbm_fc = (anlpar & ANLPAR_PAUSE) ? sbmac_fc_frame : sbmac_fc_disabled;
p += sprintf(p,"100BaseT FDX");
}
else if (anlpar & ANLPAR_TXHD) {
s->sbm_speed = sbmac_speed_100;
s->sbm_duplex = sbmac_duplex_half;
s->sbm_fc = sbmac_fc_disabled;
p += sprintf(p,"100BaseT HDX");
}
else if (anlpar & ANLPAR_10FD) {
s->sbm_speed = sbmac_speed_10;
s->sbm_duplex = sbmac_duplex_full;
s->sbm_fc = sbmac_fc_frame;
p += sprintf(p,"10BaseT FDX");
}
else if (anlpar & ANLPAR_10HD) {
s->sbm_speed = sbmac_speed_10;
s->sbm_duplex = sbmac_duplex_half;
s->sbm_fc = sbmac_fc_collision;
p += sprintf(p,"10BaseT HDX");
}
else {
p += sprintf(p,"Unknown");
}
if (noisy) {
printk(KERN_INFO "%s: %s\n",s->sbm_dev->name,buffer);
}
return 1;
}
static void sbmac_timer(unsigned long data)
{
struct net_device *dev = (struct net_device *)data;
struct sbmac_softc *sc = netdev_priv(dev);
int next_tick = HZ;
int mii_status;
spin_lock_irq (&sc->sbm_lock);
/* make IFF_RUNNING follow the MII status bit "Link established" */
mii_status = sbmac_mii_read(sc, sc->sbm_phys[0], MII_BMSR);
if ( (mii_status & BMSR_LINKSTAT) != (sc->sbm_phy_oldlinkstat) ) {
sc->sbm_phy_oldlinkstat = mii_status & BMSR_LINKSTAT;
if (mii_status & BMSR_LINKSTAT) {
netif_carrier_on(dev);
}
else {
netif_carrier_off(dev);
}
}
/*
* Poll the PHY to see what speed we should be running at
*/
if (sbmac_mii_poll(sc,noisy_mii)) {
if (sc->sbm_state != sbmac_state_off) {
/*
* something changed, restart the channel
*/
if (debug > 1) {
printk("%s: restarting channel because speed changed\n",
sc->sbm_dev->name);
}
sbmac_channel_stop(sc);
sbmac_channel_start(sc);
}
}
spin_unlock_irq (&sc->sbm_lock);
sc->sbm_timer.expires = jiffies + next_tick;
add_timer(&sc->sbm_timer);
}
static void sbmac_tx_timeout (struct net_device *dev)
{
struct sbmac_softc *sc = netdev_priv(dev);
spin_lock_irq (&sc->sbm_lock);
dev->trans_start = jiffies;
sc->sbm_stats.tx_errors++;
spin_unlock_irq (&sc->sbm_lock);
printk (KERN_WARNING "%s: Transmit timed out\n",dev->name);
}
static struct net_device_stats *sbmac_get_stats(struct net_device *dev)
{
struct sbmac_softc *sc = netdev_priv(dev);
unsigned long flags;
spin_lock_irqsave(&sc->sbm_lock, flags);
/* XXX update other stats here */
spin_unlock_irqrestore(&sc->sbm_lock, flags);
return &sc->sbm_stats;
}
static void sbmac_set_rx_mode(struct net_device *dev)
{
unsigned long flags;
int msg_flag = 0;
struct sbmac_softc *sc = netdev_priv(dev);
spin_lock_irqsave(&sc->sbm_lock, flags);
if ((dev->flags ^ sc->sbm_devflags) & IFF_PROMISC) {
/*
* Promiscuous changed.
*/
if (dev->flags & IFF_PROMISC) {
/* Unconditionally log net taps. */
msg_flag = 1;
sbmac_promiscuous_mode(sc,1);
}
else {
msg_flag = 2;
sbmac_promiscuous_mode(sc,0);
}
}
spin_unlock_irqrestore(&sc->sbm_lock, flags);
if (msg_flag) {
printk(KERN_NOTICE "%s: Promiscuous mode %sabled.\n",
dev->name,(msg_flag==1)?"en":"dis");
}
/*
* Program the multicasts. Do this every time.
*/
sbmac_setmulti(sc);
}
static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct sbmac_softc *sc = netdev_priv(dev);
u16 *data = (u16 *)&rq->ifr_ifru;
unsigned long flags;
int retval;
spin_lock_irqsave(&sc->sbm_lock, flags);
retval = 0;
switch(cmd) {
case SIOCDEVPRIVATE: /* Get the address of the PHY in use. */
data[0] = sc->sbm_phys[0] & 0x1f;
/* Fall Through */
case SIOCDEVPRIVATE+1: /* Read the specified MII register. */
data[3] = sbmac_mii_read(sc, data[0] & 0x1f, data[1] & 0x1f);
break;
case SIOCDEVPRIVATE+2: /* Write the specified MII register */
if (!capable(CAP_NET_ADMIN)) {
retval = -EPERM;
break;
}
if (debug > 1) {
printk(KERN_DEBUG "%s: sbmac_mii_ioctl: write %02X %02X %02X\n",dev->name,
data[0],data[1],data[2]);
}
sbmac_mii_write(sc, data[0] & 0x1f, data[1] & 0x1f, data[2]);
break;
default:
retval = -EOPNOTSUPP;
}
spin_unlock_irqrestore(&sc->sbm_lock, flags);
return retval;
}
static int sbmac_close(struct net_device *dev)
{
struct sbmac_softc *sc = netdev_priv(dev);
unsigned long flags;
int irq;
sbmac_set_channel_state(sc,sbmac_state_off);
del_timer_sync(&sc->sbm_timer);
spin_lock_irqsave(&sc->sbm_lock, flags);
netif_stop_queue(dev);
if (debug > 1) {
printk(KERN_DEBUG "%s: Shutting down ethercard\n",dev->name);
}
spin_unlock_irqrestore(&sc->sbm_lock, flags);
irq = dev->irq;
synchronize_irq(irq);
free_irq(irq, dev);
sbdma_emptyring(&(sc->sbm_txdma));
sbdma_emptyring(&(sc->sbm_rxdma));
return 0;
}
#if defined(SBMAC_ETH0_HWADDR) || defined(SBMAC_ETH1_HWADDR) || defined(SBMAC_ETH2_HWADDR)
static void
sbmac_setup_hwaddr(int chan,char *addr)
{
uint8_t eaddr[6];
uint64_t val;
sbmac_port_t port;
port = A_MAC_CHANNEL_BASE(chan);
sbmac_parse_hwaddr(addr,eaddr);
val = sbmac_addr2reg(eaddr);
SBMAC_WRITECSR(IOADDR(port+R_MAC_ETHERNET_ADDR),val);
val = SBMAC_READCSR(IOADDR(port+R_MAC_ETHERNET_ADDR));
}
#endif
static struct net_device *dev_sbmac[MAX_UNITS];
static int __init
sbmac_init_module(void)
{
int idx;
struct net_device *dev;
sbmac_port_t port;
int chip_max_units;
/*
* For bringup when not using the firmware, we can pre-fill
* the MAC addresses using the environment variables
* specified in this file (or maybe from the config file?)
*/
#ifdef SBMAC_ETH0_HWADDR
sbmac_setup_hwaddr(0,SBMAC_ETH0_HWADDR);
#endif
#ifdef SBMAC_ETH1_HWADDR
sbmac_setup_hwaddr(1,SBMAC_ETH1_HWADDR);
#endif
#ifdef SBMAC_ETH2_HWADDR
sbmac_setup_hwaddr(2,SBMAC_ETH2_HWADDR);
#endif
/*
* Walk through the Ethernet controllers and find
* those who have their MAC addresses set.
*/
switch (soc_type) {
case K_SYS_SOC_TYPE_BCM1250:
case K_SYS_SOC_TYPE_BCM1250_ALT:
chip_max_units = 3;
break;
case K_SYS_SOC_TYPE_BCM1120:
case K_SYS_SOC_TYPE_BCM1125:
case K_SYS_SOC_TYPE_BCM1125H:
case K_SYS_SOC_TYPE_BCM1250_ALT2: /* Hybrid */
chip_max_units = 2;
break;
default:
chip_max_units = 0;
break;
}
if (chip_max_units > MAX_UNITS)
chip_max_units = MAX_UNITS;
for (idx = 0; idx < chip_max_units; idx++) {
/*
* This is the base address of the MAC.
*/
port = A_MAC_CHANNEL_BASE(idx);
/*
* The R_MAC_ETHERNET_ADDR register will be set to some nonzero
* value for us by the firmware if we're going to use this MAC.
* If we find a zero, skip this MAC.
*/
sbmac_orig_hwaddr[idx] = SBMAC_READCSR(IOADDR(port+R_MAC_ETHERNET_ADDR));
if (sbmac_orig_hwaddr[idx] == 0) {
printk(KERN_DEBUG "sbmac: not configuring MAC at "
"%lx\n", port);
continue;
}
/*
* Okay, cool. Initialize this MAC.
*/
dev = alloc_etherdev(sizeof(struct sbmac_softc));
if (!dev)
return -ENOMEM; /* return ENOMEM */
printk(KERN_DEBUG "sbmac: configuring MAC at %lx\n", port);
dev->irq = K_INT_MAC_0 + idx;
dev->base_addr = port;
dev->mem_end = 0;
if (sbmac_init(dev, idx)) {
port = A_MAC_CHANNEL_BASE(idx);
SBMAC_WRITECSR(IOADDR(port+R_MAC_ETHERNET_ADDR),
sbmac_orig_hwaddr[idx]);
free_netdev(dev);
continue;
}
dev_sbmac[idx] = dev;
}
return 0;
}
static void __exit
sbmac_cleanup_module(void)
{
struct net_device *dev;
int idx;
for (idx = 0; idx < MAX_UNITS; idx++) {
struct sbmac_softc *sc;
dev = dev_sbmac[idx];
if (!dev)
continue;
sc = netdev_priv(dev);
unregister_netdev(dev);
sbmac_uninitctx(sc);
free_netdev(dev);
}
}
module_init(sbmac_init_module);
module_exit(sbmac_cleanup_module);
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