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linux/drivers/net/declance.c
Maciej W. Rozycki 963267bc5d declance: Restore tx descriptor ring locking 
A driver overhaul on 29 Feb 2000 (!) broke locking around fiddling with 
the tx descriptor ring in start_xmit(); a follow-on "fix" removed the 
broken remnants altogether.  Here's a patch to restore proper locking in 
the function -- the complement in the interrupt handler has been correct 
all the time.

 This *may* have been the reason for the occasional confusion of the chip 
-- triggering a tx timeout followed by a chip reset sequence -- seen on 
R4k-based DECstations with the onboard Ethernet interface.  Another theory 
is the confusion is due to an unindentified problem -- perhaps a silicon 
erratum -- associated with the variation of the MT ASIC used to interface 
the R4k CPU to the rest of the system on these computers; with its 
aggressive write-back buffering the design is particularly weakly ordered 
when it comes to MMIO (in the absence of ordering barriers uncached reads 
are allowed to bypass earlier uncached writes, even if to the same 
location), which may trigger all kinds of corner cases in peripheral 
hardware as well as software.

Either way this piece of code is buggy.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-08 02:42:35 -07:00

1387 lines
35 KiB
C
Raw Blame History

/*
* Lance ethernet driver for the MIPS processor based
* DECstation family
*
*
* adopted from sunlance.c by Richard van den Berg
*
* Copyright (C) 2002, 2003, 2005, 2006 Maciej W. Rozycki
*
* additional sources:
* - PMAD-AA TURBOchannel Ethernet Module Functional Specification,
* Revision 1.2
*
* History:
*
* v0.001: The kernel accepts the code and it shows the hardware address.
*
* v0.002: Removed most sparc stuff, left only some module and dma stuff.
*
* v0.003: Enhanced base address calculation from proposals by
* Harald Koerfgen and Thomas Riemer.
*
* v0.004: lance-regs is pointing at the right addresses, added prom
* check. First start of address mapping and DMA.
*
* v0.005: started to play around with LANCE-DMA. This driver will not
* work for non IOASIC lances. HK
*
* v0.006: added pointer arrays to lance_private and setup routine for
* them in dec_lance_init. HK
*
* v0.007: Big shit. The LANCE seems to use a different DMA mechanism to
* access the init block. This looks like one (short) word at a
* time, but the smallest amount the IOASIC can transfer is a
* (long) word. So we have a 2-2 padding here. Changed
* lance_init_block accordingly. The 16-16 padding for the buffers
* seems to be correct. HK
*
* v0.008: mods to make PMAX_LANCE work. 01/09/1999 triemer
*
* v0.009: Module support fixes, multiple interfaces support, various
* bits. macro
*
* v0.010: Fixes for the PMAD mapping of the LANCE buffer and for the
* PMAX requirement to only use halfword accesses to the
* buffer. macro
*
* v0.011: Converted the PMAD to the driver model. macro
*/
#include <linux/crc32.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/tc.h>
#include <linux/types.h>
#include <asm/addrspace.h>
#include <asm/system.h>
#include <asm/dec/interrupts.h>
#include <asm/dec/ioasic.h>
#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/kn01.h>
#include <asm/dec/machtype.h>
#include <asm/dec/system.h>
static char version[] __devinitdata =
"declance.c: v0.011 by Linux MIPS DECstation task force\n";
MODULE_AUTHOR("Linux MIPS DECstation task force");
MODULE_DESCRIPTION("DEC LANCE (DECstation onboard, PMAD-xx) driver");
MODULE_LICENSE("GPL");
#define __unused __attribute__ ((unused))
/*
* card types
*/
#define ASIC_LANCE 1
#define PMAD_LANCE 2
#define PMAX_LANCE 3
#define LE_CSR0 0
#define LE_CSR1 1
#define LE_CSR2 2
#define LE_CSR3 3
#define LE_MO_PROM 0x8000 /* Enable promiscuous mode */
#define LE_C0_ERR 0x8000 /* Error: set if BAB, SQE, MISS or ME is set */
#define LE_C0_BABL 0x4000 /* BAB: Babble: tx timeout. */
#define LE_C0_CERR 0x2000 /* SQE: Signal quality error */
#define LE_C0_MISS 0x1000 /* MISS: Missed a packet */
#define LE_C0_MERR 0x0800 /* ME: Memory error */
#define LE_C0_RINT 0x0400 /* Received interrupt */
#define LE_C0_TINT 0x0200 /* Transmitter Interrupt */
#define LE_C0_IDON 0x0100 /* IFIN: Init finished. */
#define LE_C0_INTR 0x0080 /* Interrupt or error */
#define LE_C0_INEA 0x0040 /* Interrupt enable */
#define LE_C0_RXON 0x0020 /* Receiver on */
#define LE_C0_TXON 0x0010 /* Transmitter on */
#define LE_C0_TDMD 0x0008 /* Transmitter demand */
#define LE_C0_STOP 0x0004 /* Stop the card */
#define LE_C0_STRT 0x0002 /* Start the card */
#define LE_C0_INIT 0x0001 /* Init the card */
#define LE_C3_BSWP 0x4 /* SWAP */
#define LE_C3_ACON 0x2 /* ALE Control */
#define LE_C3_BCON 0x1 /* Byte control */
/* Receive message descriptor 1 */
#define LE_R1_OWN 0x8000 /* Who owns the entry */
#define LE_R1_ERR 0x4000 /* Error: if FRA, OFL, CRC or BUF is set */
#define LE_R1_FRA 0x2000 /* FRA: Frame error */
#define LE_R1_OFL 0x1000 /* OFL: Frame overflow */
#define LE_R1_CRC 0x0800 /* CRC error */
#define LE_R1_BUF 0x0400 /* BUF: Buffer error */
#define LE_R1_SOP 0x0200 /* Start of packet */
#define LE_R1_EOP 0x0100 /* End of packet */
#define LE_R1_POK 0x0300 /* Packet is complete: SOP + EOP */
/* Transmit message descriptor 1 */
#define LE_T1_OWN 0x8000 /* Lance owns the packet */
#define LE_T1_ERR 0x4000 /* Error summary */
#define LE_T1_EMORE 0x1000 /* Error: more than one retry needed */
#define LE_T1_EONE 0x0800 /* Error: one retry needed */
#define LE_T1_EDEF 0x0400 /* Error: deferred */
#define LE_T1_SOP 0x0200 /* Start of packet */
#define LE_T1_EOP 0x0100 /* End of packet */
#define LE_T1_POK 0x0300 /* Packet is complete: SOP + EOP */
#define LE_T3_BUF 0x8000 /* Buffer error */
#define LE_T3_UFL 0x4000 /* Error underflow */
#define LE_T3_LCOL 0x1000 /* Error late collision */
#define LE_T3_CLOS 0x0800 /* Error carrier loss */
#define LE_T3_RTY 0x0400 /* Error retry */
#define LE_T3_TDR 0x03ff /* Time Domain Reflectometry counter */
/* Define: 2^4 Tx buffers and 2^4 Rx buffers */
#ifndef LANCE_LOG_TX_BUFFERS
#define LANCE_LOG_TX_BUFFERS 4
#define LANCE_LOG_RX_BUFFERS 4
#endif
#define TX_RING_SIZE (1 << (LANCE_LOG_TX_BUFFERS))
#define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
#define RX_RING_SIZE (1 << (LANCE_LOG_RX_BUFFERS))
#define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
#define PKT_BUF_SZ 1536
#define RX_BUFF_SIZE PKT_BUF_SZ
#define TX_BUFF_SIZE PKT_BUF_SZ
#undef TEST_HITS
#define ZERO 0
/*
* The DS2100/3100 have a linear 64 kB buffer which supports halfword
* accesses only. Each halfword of the buffer is word-aligned in the
* CPU address space.
*
* The PMAD-AA has a 128 kB buffer on-board.
*
* The IOASIC LANCE devices use a shared memory region. This region
* as seen from the CPU is (max) 128 kB long and has to be on an 128 kB
* boundary. The LANCE sees this as a 64 kB long continuous memory
* region.
*
* The LANCE's DMA address is used as an index in this buffer and DMA
* takes place in bursts of eight 16-bit words which are packed into
* four 32-bit words by the IOASIC. This leads to a strange padding:
* 16 bytes of valid data followed by a 16 byte gap :-(.
*/
struct lance_rx_desc {
unsigned short rmd0; /* low address of packet */
unsigned short rmd1; /* high address of packet
and descriptor bits */
short length; /* 2s complement (negative!)
of buffer length */
unsigned short mblength; /* actual number of bytes received */
};
struct lance_tx_desc {
unsigned short tmd0; /* low address of packet */
unsigned short tmd1; /* high address of packet
and descriptor bits */
short length; /* 2s complement (negative!)
of buffer length */
unsigned short misc;
};
/* First part of the LANCE initialization block, described in databook. */
struct lance_init_block {
unsigned short mode; /* pre-set mode (reg. 15) */
unsigned short phys_addr[3]; /* physical ethernet address */
unsigned short filter[4]; /* multicast filter */
/* Receive and transmit ring base, along with extra bits. */
unsigned short rx_ptr; /* receive descriptor addr */
unsigned short rx_len; /* receive len and high addr */
unsigned short tx_ptr; /* transmit descriptor addr */
unsigned short tx_len; /* transmit len and high addr */
short gap[4];
/* The buffer descriptors */
struct lance_rx_desc brx_ring[RX_RING_SIZE];
struct lance_tx_desc btx_ring[TX_RING_SIZE];
};
#define BUF_OFFSET_CPU sizeof(struct lance_init_block)
#define BUF_OFFSET_LNC sizeof(struct lance_init_block)
#define shift_off(off, type) \
(type == ASIC_LANCE || type == PMAX_LANCE ? off << 1 : off)
#define lib_off(rt, type) \
shift_off(offsetof(struct lance_init_block, rt), type)
#define lib_ptr(ib, rt, type) \
((volatile u16 *)((u8 *)(ib) + lib_off(rt, type)))
#define rds_off(rt, type) \
shift_off(offsetof(struct lance_rx_desc, rt), type)
#define rds_ptr(rd, rt, type) \
((volatile u16 *)((u8 *)(rd) + rds_off(rt, type)))
#define tds_off(rt, type) \
shift_off(offsetof(struct lance_tx_desc, rt), type)
#define tds_ptr(td, rt, type) \
((volatile u16 *)((u8 *)(td) + tds_off(rt, type)))
struct lance_private {
struct net_device *next;
int type;
int dma_irq;
volatile struct lance_regs *ll;
spinlock_t lock;
int rx_new, tx_new;
int rx_old, tx_old;
unsigned short busmaster_regval;
struct timer_list multicast_timer;
/* Pointers to the ring buffers as seen from the CPU */
char *rx_buf_ptr_cpu[RX_RING_SIZE];
char *tx_buf_ptr_cpu[TX_RING_SIZE];
/* Pointers to the ring buffers as seen from the LANCE */
uint rx_buf_ptr_lnc[RX_RING_SIZE];
uint tx_buf_ptr_lnc[TX_RING_SIZE];
};
#define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
lp->tx_old+TX_RING_MOD_MASK-lp->tx_new:\
lp->tx_old - lp->tx_new-1)
/* The lance control ports are at an absolute address, machine and tc-slot
* dependent.
* DECstations do only 32-bit access and the LANCE uses 16 bit addresses,
* so we have to give the structure an extra member making rap pointing
* at the right address
*/
struct lance_regs {
volatile unsigned short rdp; /* register data port */
unsigned short pad;
volatile unsigned short rap; /* register address port */
};
int dec_lance_debug = 2;
static struct tc_driver dec_lance_tc_driver;
static struct net_device *root_lance_dev;
static inline void writereg(volatile unsigned short *regptr, short value)
{
*regptr = value;
iob();
}
/* Load the CSR registers */
static void load_csrs(struct lance_private *lp)
{
volatile struct lance_regs *ll = lp->ll;
uint leptr;
/* The address space as seen from the LANCE
* begins at address 0. HK
*/
leptr = 0;
writereg(&ll->rap, LE_CSR1);
writereg(&ll->rdp, (leptr & 0xFFFF));
writereg(&ll->rap, LE_CSR2);
writereg(&ll->rdp, leptr >> 16);
writereg(&ll->rap, LE_CSR3);
writereg(&ll->rdp, lp->busmaster_regval);
/* Point back to csr0 */
writereg(&ll->rap, LE_CSR0);
}
/*
* Our specialized copy routines
*
*/
static void cp_to_buf(const int type, void *to, const void *from, int len)
{
unsigned short *tp, *fp, clen;
unsigned char *rtp, *rfp;
if (type == PMAD_LANCE) {
memcpy(to, from, len);
} else if (type == PMAX_LANCE) {
clen = len >> 1;
tp = (unsigned short *) to;
fp = (unsigned short *) from;
while (clen--) {
*tp++ = *fp++;
tp++;
}
clen = len & 1;
rtp = (unsigned char *) tp;
rfp = (unsigned char *) fp;
while (clen--) {
*rtp++ = *rfp++;
}
} else {
/*
* copy 16 Byte chunks
*/
clen = len >> 4;
tp = (unsigned short *) to;
fp = (unsigned short *) from;
while (clen--) {
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
tp += 8;
}
/*
* do the rest, if any.
*/
clen = len & 15;
rtp = (unsigned char *) tp;
rfp = (unsigned char *) fp;
while (clen--) {
*rtp++ = *rfp++;
}
}
iob();
}
static void cp_from_buf(const int type, void *to, const void *from, int len)
{
unsigned short *tp, *fp, clen;
unsigned char *rtp, *rfp;
if (type == PMAD_LANCE) {
memcpy(to, from, len);
} else if (type == PMAX_LANCE) {
clen = len >> 1;
tp = (unsigned short *) to;
fp = (unsigned short *) from;
while (clen--) {
*tp++ = *fp++;
fp++;
}
clen = len & 1;
rtp = (unsigned char *) tp;
rfp = (unsigned char *) fp;
while (clen--) {
*rtp++ = *rfp++;
}
} else {
/*
* copy 16 Byte chunks
*/
clen = len >> 4;
tp = (unsigned short *) to;
fp = (unsigned short *) from;
while (clen--) {
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
*tp++ = *fp++;
fp += 8;
}
/*
* do the rest, if any.
*/
clen = len & 15;
rtp = (unsigned char *) tp;
rfp = (unsigned char *) fp;
while (clen--) {
*rtp++ = *rfp++;
}
}
}
/* Setup the Lance Rx and Tx rings */
static void lance_init_ring(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile u16 *ib = (volatile u16 *)dev->mem_start;
uint leptr;
int i;
/* Lock out other processes while setting up hardware */
netif_stop_queue(dev);
lp->rx_new = lp->tx_new = 0;
lp->rx_old = lp->tx_old = 0;
/* Copy the ethernet address to the lance init block.
* XXX bit 0 of the physical address registers has to be zero
*/
*lib_ptr(ib, phys_addr[0], lp->type) = (dev->dev_addr[1] << 8) |
dev->dev_addr[0];
*lib_ptr(ib, phys_addr[1], lp->type) = (dev->dev_addr[3] << 8) |
dev->dev_addr[2];
*lib_ptr(ib, phys_addr[2], lp->type) = (dev->dev_addr[5] << 8) |
dev->dev_addr[4];
/* Setup the initialization block */
/* Setup rx descriptor pointer */
leptr = offsetof(struct lance_init_block, brx_ring);
*lib_ptr(ib, rx_len, lp->type) = (LANCE_LOG_RX_BUFFERS << 13) |
(leptr >> 16);
*lib_ptr(ib, rx_ptr, lp->type) = leptr;
if (ZERO)
printk("RX ptr: %8.8x(%8.8x)\n",
leptr, lib_off(brx_ring, lp->type));
/* Setup tx descriptor pointer */
leptr = offsetof(struct lance_init_block, btx_ring);
*lib_ptr(ib, tx_len, lp->type) = (LANCE_LOG_TX_BUFFERS << 13) |
(leptr >> 16);
*lib_ptr(ib, tx_ptr, lp->type) = leptr;
if (ZERO)
printk("TX ptr: %8.8x(%8.8x)\n",
leptr, lib_off(btx_ring, lp->type));
if (ZERO)
printk("TX rings:\n");
/* Setup the Tx ring entries */
for (i = 0; i < TX_RING_SIZE; i++) {
leptr = lp->tx_buf_ptr_lnc[i];
*lib_ptr(ib, btx_ring[i].tmd0, lp->type) = leptr;
*lib_ptr(ib, btx_ring[i].tmd1, lp->type) = (leptr >> 16) &
0xff;
*lib_ptr(ib, btx_ring[i].length, lp->type) = 0xf000;
/* The ones required by tmd2 */
*lib_ptr(ib, btx_ring[i].misc, lp->type) = 0;
if (i < 3 && ZERO)
printk("%d: 0x%8.8x(0x%8.8x)\n",
i, leptr, (uint)lp->tx_buf_ptr_cpu[i]);
}
/* Setup the Rx ring entries */
if (ZERO)
printk("RX rings:\n");
for (i = 0; i < RX_RING_SIZE; i++) {
leptr = lp->rx_buf_ptr_lnc[i];
*lib_ptr(ib, brx_ring[i].rmd0, lp->type) = leptr;
*lib_ptr(ib, brx_ring[i].rmd1, lp->type) = ((leptr >> 16) &
0xff) |
LE_R1_OWN;
*lib_ptr(ib, brx_ring[i].length, lp->type) = -RX_BUFF_SIZE |
0xf000;
*lib_ptr(ib, brx_ring[i].mblength, lp->type) = 0;
if (i < 3 && ZERO)
printk("%d: 0x%8.8x(0x%8.8x)\n",
i, leptr, (uint)lp->rx_buf_ptr_cpu[i]);
}
iob();
}
static int init_restart_lance(struct lance_private *lp)
{
volatile struct lance_regs *ll = lp->ll;
int i;
writereg(&ll->rap, LE_CSR0);
writereg(&ll->rdp, LE_C0_INIT);
/* Wait for the lance to complete initialization */
for (i = 0; (i < 100) && !(ll->rdp & LE_C0_IDON); i++) {
udelay(10);
}
if ((i == 100) || (ll->rdp & LE_C0_ERR)) {
printk("LANCE unopened after %d ticks, csr0=%4.4x.\n",
i, ll->rdp);
return -1;
}
if ((ll->rdp & LE_C0_ERR)) {
printk("LANCE unopened after %d ticks, csr0=%4.4x.\n",
i, ll->rdp);
return -1;
}
writereg(&ll->rdp, LE_C0_IDON);
writereg(&ll->rdp, LE_C0_STRT);
writereg(&ll->rdp, LE_C0_INEA);
return 0;
}
static int lance_rx(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile u16 *ib = (volatile u16 *)dev->mem_start;
volatile u16 *rd;
unsigned short bits;
int entry, len;
struct sk_buff *skb;
#ifdef TEST_HITS
{
int i;
printk("[");
for (i = 0; i < RX_RING_SIZE; i++) {
if (i == lp->rx_new)
printk("%s", *lib_ptr(ib, brx_ring[i].rmd1,
lp->type) &
LE_R1_OWN ? "_" : "X");
else
printk("%s", *lib_ptr(ib, brx_ring[i].rmd1,
lp->type) &
LE_R1_OWN ? "." : "1");
}
printk("]");
}
#endif
for (rd = lib_ptr(ib, brx_ring[lp->rx_new], lp->type);
!((bits = *rds_ptr(rd, rmd1, lp->type)) & LE_R1_OWN);
rd = lib_ptr(ib, brx_ring[lp->rx_new], lp->type)) {
entry = lp->rx_new;
/* We got an incomplete frame? */
if ((bits & LE_R1_POK) != LE_R1_POK) {
dev->stats.rx_over_errors++;
dev->stats.rx_errors++;
} else if (bits & LE_R1_ERR) {
/* Count only the end frame as a rx error,
* not the beginning
*/
if (bits & LE_R1_BUF)
dev->stats.rx_fifo_errors++;
if (bits & LE_R1_CRC)
dev->stats.rx_crc_errors++;
if (bits & LE_R1_OFL)
dev->stats.rx_over_errors++;
if (bits & LE_R1_FRA)
dev->stats.rx_frame_errors++;
if (bits & LE_R1_EOP)
dev->stats.rx_errors++;
} else {
len = (*rds_ptr(rd, mblength, lp->type) & 0xfff) - 4;
skb = dev_alloc_skb(len + 2);
if (skb == 0) {
printk("%s: Memory squeeze, deferring packet.\n",
dev->name);
dev->stats.rx_dropped++;
*rds_ptr(rd, mblength, lp->type) = 0;
*rds_ptr(rd, rmd1, lp->type) =
((lp->rx_buf_ptr_lnc[entry] >> 16) &
0xff) | LE_R1_OWN;
lp->rx_new = (entry + 1) & RX_RING_MOD_MASK;
return 0;
}
dev->stats.rx_bytes += len;
skb_reserve(skb, 2); /* 16 byte align */
skb_put(skb, len); /* make room */
cp_from_buf(lp->type, skb->data,
(char *)lp->rx_buf_ptr_cpu[entry], len);
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
dev->stats.rx_packets++;
}
/* Return the packet to the pool */
*rds_ptr(rd, mblength, lp->type) = 0;
*rds_ptr(rd, length, lp->type) = -RX_BUFF_SIZE | 0xf000;
*rds_ptr(rd, rmd1, lp->type) =
((lp->rx_buf_ptr_lnc[entry] >> 16) & 0xff) | LE_R1_OWN;
lp->rx_new = (entry + 1) & RX_RING_MOD_MASK;
}
return 0;
}
static void lance_tx(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile u16 *ib = (volatile u16 *)dev->mem_start;
volatile struct lance_regs *ll = lp->ll;
volatile u16 *td;
int i, j;
int status;
j = lp->tx_old;
spin_lock(&lp->lock);
for (i = j; i != lp->tx_new; i = j) {
td = lib_ptr(ib, btx_ring[i], lp->type);
/* If we hit a packet not owned by us, stop */
if (*tds_ptr(td, tmd1, lp->type) & LE_T1_OWN)
break;
if (*tds_ptr(td, tmd1, lp->type) & LE_T1_ERR) {
status = *tds_ptr(td, misc, lp->type);
dev->stats.tx_errors++;
if (status & LE_T3_RTY)
dev->stats.tx_aborted_errors++;
if (status & LE_T3_LCOL)
dev->stats.tx_window_errors++;
if (status & LE_T3_CLOS) {
dev->stats.tx_carrier_errors++;
printk("%s: Carrier Lost\n", dev->name);
/* Stop the lance */
writereg(&ll->rap, LE_CSR0);
writereg(&ll->rdp, LE_C0_STOP);
lance_init_ring(dev);
load_csrs(lp);
init_restart_lance(lp);
goto out;
}
/* Buffer errors and underflows turn off the
* transmitter, restart the adapter.
*/
if (status & (LE_T3_BUF | LE_T3_UFL)) {
dev->stats.tx_fifo_errors++;
printk("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
dev->name);
/* Stop the lance */
writereg(&ll->rap, LE_CSR0);
writereg(&ll->rdp, LE_C0_STOP);
lance_init_ring(dev);
load_csrs(lp);
init_restart_lance(lp);
goto out;
}
} else if ((*tds_ptr(td, tmd1, lp->type) & LE_T1_POK) ==
LE_T1_POK) {
/*
* So we don't count the packet more than once.
*/
*tds_ptr(td, tmd1, lp->type) &= ~(LE_T1_POK);
/* One collision before packet was sent. */
if (*tds_ptr(td, tmd1, lp->type) & LE_T1_EONE)
dev->stats.collisions++;
/* More than one collision, be optimistic. */
if (*tds_ptr(td, tmd1, lp->type) & LE_T1_EMORE)
dev->stats.collisions += 2;
dev->stats.tx_packets++;
}
j = (j + 1) & TX_RING_MOD_MASK;
}
lp->tx_old = j;
out:
if (netif_queue_stopped(dev) &&
TX_BUFFS_AVAIL > 0)
netif_wake_queue(dev);
spin_unlock(&lp->lock);
}
static irqreturn_t lance_dma_merr_int(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
printk(KERN_ERR "%s: DMA error\n", dev->name);
return IRQ_HANDLED;
}
static irqreturn_t lance_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_regs *ll = lp->ll;
int csr0;
writereg(&ll->rap, LE_CSR0);
csr0 = ll->rdp;
/* Acknowledge all the interrupt sources ASAP */
writereg(&ll->rdp, csr0 & (LE_C0_INTR | LE_C0_TINT | LE_C0_RINT));
if ((csr0 & LE_C0_ERR)) {
/* Clear the error condition */
writereg(&ll->rdp, LE_C0_BABL | LE_C0_ERR | LE_C0_MISS |
LE_C0_CERR | LE_C0_MERR);
}
if (csr0 & LE_C0_RINT)
lance_rx(dev);
if (csr0 & LE_C0_TINT)
lance_tx(dev);
if (csr0 & LE_C0_BABL)
dev->stats.tx_errors++;
if (csr0 & LE_C0_MISS)
dev->stats.rx_errors++;
if (csr0 & LE_C0_MERR) {
printk("%s: Memory error, status %04x\n", dev->name, csr0);
writereg(&ll->rdp, LE_C0_STOP);
lance_init_ring(dev);
load_csrs(lp);
init_restart_lance(lp);
netif_wake_queue(dev);
}
writereg(&ll->rdp, LE_C0_INEA);
writereg(&ll->rdp, LE_C0_INEA);
return IRQ_HANDLED;
}
static int lance_open(struct net_device *dev)
{
volatile u16 *ib = (volatile u16 *)dev->mem_start;
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_regs *ll = lp->ll;
int status = 0;
/* Stop the Lance */
writereg(&ll->rap, LE_CSR0);
writereg(&ll->rdp, LE_C0_STOP);
/* Set mode and clear multicast filter only at device open,
* so that lance_init_ring() called at any error will not
* forget multicast filters.
*
* BTW it is common bug in all lance drivers! --ANK
*/
*lib_ptr(ib, mode, lp->type) = 0;
*lib_ptr(ib, filter[0], lp->type) = 0;
*lib_ptr(ib, filter[1], lp->type) = 0;
*lib_ptr(ib, filter[2], lp->type) = 0;
*lib_ptr(ib, filter[3], lp->type) = 0;
lance_init_ring(dev);
load_csrs(lp);
netif_start_queue(dev);
/* Associate IRQ with lance_interrupt */
if (request_irq(dev->irq, &lance_interrupt, 0, "lance", dev)) {
printk("%s: Can't get IRQ %d\n", dev->name, dev->irq);
return -EAGAIN;
}
if (lp->dma_irq >= 0) {
unsigned long flags;
if (request_irq(lp->dma_irq, &lance_dma_merr_int, 0,
"lance error", dev)) {
free_irq(dev->irq, dev);
printk("%s: Can't get DMA IRQ %d\n", dev->name,
lp->dma_irq);
return -EAGAIN;
}
spin_lock_irqsave(&ioasic_ssr_lock, flags);
fast_mb();
/* Enable I/O ASIC LANCE DMA. */
ioasic_write(IO_REG_SSR,
ioasic_read(IO_REG_SSR) | IO_SSR_LANCE_DMA_EN);
fast_mb();
spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
}
status = init_restart_lance(lp);
return status;
}
static int lance_close(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_regs *ll = lp->ll;
netif_stop_queue(dev);
del_timer_sync(&lp->multicast_timer);
/* Stop the card */
writereg(&ll->rap, LE_CSR0);
writereg(&ll->rdp, LE_C0_STOP);
if (lp->dma_irq >= 0) {
unsigned long flags;
spin_lock_irqsave(&ioasic_ssr_lock, flags);
fast_mb();
/* Disable I/O ASIC LANCE DMA. */
ioasic_write(IO_REG_SSR,
ioasic_read(IO_REG_SSR) & ~IO_SSR_LANCE_DMA_EN);
fast_iob();
spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
free_irq(lp->dma_irq, dev);
}
free_irq(dev->irq, dev);
return 0;
}
static inline int lance_reset(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_regs *ll = lp->ll;
int status;
/* Stop the lance */
writereg(&ll->rap, LE_CSR0);
writereg(&ll->rdp, LE_C0_STOP);
lance_init_ring(dev);
load_csrs(lp);
dev->trans_start = jiffies;
status = init_restart_lance(lp);
return status;
}
static void lance_tx_timeout(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_regs *ll = lp->ll;
printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
dev->name, ll->rdp);
lance_reset(dev);
netif_wake_queue(dev);
}
static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_regs *ll = lp->ll;
volatile u16 *ib = (volatile u16 *)dev->mem_start;
unsigned long flags;
int entry, len;
len = skb->len;
if (len < ETH_ZLEN) {
if (skb_padto(skb, ETH_ZLEN))
return 0;
len = ETH_ZLEN;
}
dev->stats.tx_bytes += len;
spin_lock_irqsave(&lp->lock, flags);
entry = lp->tx_new;
*lib_ptr(ib, btx_ring[entry].length, lp->type) = (-len);
*lib_ptr(ib, btx_ring[entry].misc, lp->type) = 0;
cp_to_buf(lp->type, (char *)lp->tx_buf_ptr_cpu[entry], skb->data, len);
/* Now, give the packet to the lance */
*lib_ptr(ib, btx_ring[entry].tmd1, lp->type) =
((lp->tx_buf_ptr_lnc[entry] >> 16) & 0xff) |
(LE_T1_POK | LE_T1_OWN);
lp->tx_new = (entry + 1) & TX_RING_MOD_MASK;
if (TX_BUFFS_AVAIL <= 0)
netif_stop_queue(dev);
/* Kick the lance: transmit now */
writereg(&ll->rdp, LE_C0_INEA | LE_C0_TDMD);
spin_unlock_irqrestore(&lp->lock, flags);
dev->trans_start = jiffies;
dev_kfree_skb(skb);
return 0;
}
static void lance_load_multicast(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile u16 *ib = (volatile u16 *)dev->mem_start;
struct dev_mc_list *dmi = dev->mc_list;
char *addrs;
int i;
u32 crc;
/* set all multicast bits */
if (dev->flags & IFF_ALLMULTI) {
*lib_ptr(ib, filter[0], lp->type) = 0xffff;
*lib_ptr(ib, filter[1], lp->type) = 0xffff;
*lib_ptr(ib, filter[2], lp->type) = 0xffff;
*lib_ptr(ib, filter[3], lp->type) = 0xffff;
return;
}
/* clear the multicast filter */
*lib_ptr(ib, filter[0], lp->type) = 0;
*lib_ptr(ib, filter[1], lp->type) = 0;
*lib_ptr(ib, filter[2], lp->type) = 0;
*lib_ptr(ib, filter[3], lp->type) = 0;
/* Add addresses */
for (i = 0; i < dev->mc_count; i++) {
addrs = dmi->dmi_addr;
dmi = dmi->next;
/* multicast address? */
if (!(*addrs & 1))
continue;
crc = ether_crc_le(ETH_ALEN, addrs);
crc = crc >> 26;
*lib_ptr(ib, filter[crc >> 4], lp->type) |= 1 << (crc & 0xf);
}
return;
}
static void lance_set_multicast(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile u16 *ib = (volatile u16 *)dev->mem_start;
volatile struct lance_regs *ll = lp->ll;
if (!netif_running(dev))
return;
if (lp->tx_old != lp->tx_new) {
mod_timer(&lp->multicast_timer, jiffies + 4 * HZ/100);
netif_wake_queue(dev);
return;
}
netif_stop_queue(dev);
writereg(&ll->rap, LE_CSR0);
writereg(&ll->rdp, LE_C0_STOP);
lance_init_ring(dev);
if (dev->flags & IFF_PROMISC) {
*lib_ptr(ib, mode, lp->type) |= LE_MO_PROM;
} else {
*lib_ptr(ib, mode, lp->type) &= ~LE_MO_PROM;
lance_load_multicast(dev);
}
load_csrs(lp);
init_restart_lance(lp);
netif_wake_queue(dev);
}
static void lance_set_multicast_retry(unsigned long _opaque)
{
struct net_device *dev = (struct net_device *) _opaque;
lance_set_multicast(dev);
}
static const struct net_device_ops lance_netdev_ops = {
.ndo_open = lance_open,
.ndo_stop = lance_close,
.ndo_start_xmit = lance_start_xmit,
.ndo_tx_timeout = lance_tx_timeout,
.ndo_set_multicast_list = lance_set_multicast,
.ndo_change_mtu = eth_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
};
static int __init dec_lance_probe(struct device *bdev, const int type)
{
static unsigned version_printed;
static const char fmt[] = "declance%d";
char name[10];
struct net_device *dev;
struct lance_private *lp;
volatile struct lance_regs *ll;
resource_size_t start = 0, len = 0;
int i, ret;
unsigned long esar_base;
unsigned char *esar;
if (dec_lance_debug && version_printed++ == 0)
printk(version);
if (bdev)
snprintf(name, sizeof(name), "%s", dev_name(bdev));
else {
i = 0;
dev = root_lance_dev;
while (dev) {
i++;
lp = netdev_priv(dev);
dev = lp->next;
}
snprintf(name, sizeof(name), fmt, i);
}
dev = alloc_etherdev(sizeof(struct lance_private));
if (!dev) {
printk(KERN_ERR "%s: Unable to allocate etherdev, aborting.\n",
name);
ret = -ENOMEM;
goto err_out;
}
/*
* alloc_etherdev ensures the data structures used by the LANCE
* are aligned.
*/
lp = netdev_priv(dev);
spin_lock_init(&lp->lock);
lp->type = type;
switch (type) {
case ASIC_LANCE:
dev->base_addr = CKSEG1ADDR(dec_kn_slot_base + IOASIC_LANCE);
/* buffer space for the on-board LANCE shared memory */
/*
* FIXME: ugly hack!
*/
dev->mem_start = CKSEG1ADDR(0x00020000);
dev->mem_end = dev->mem_start + 0x00020000;
dev->irq = dec_interrupt[DEC_IRQ_LANCE];
esar_base = CKSEG1ADDR(dec_kn_slot_base + IOASIC_ESAR);
/* Workaround crash with booting KN04 2.1k from Disk */
memset((void *)dev->mem_start, 0,
dev->mem_end - dev->mem_start);
/*
* setup the pointer arrays, this sucks [tm] :-(
*/
for (i = 0; i < RX_RING_SIZE; i++) {
lp->rx_buf_ptr_cpu[i] =
(char *)(dev->mem_start + 2 * BUF_OFFSET_CPU +
2 * i * RX_BUFF_SIZE);
lp->rx_buf_ptr_lnc[i] =
(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
}
for (i = 0; i < TX_RING_SIZE; i++) {
lp->tx_buf_ptr_cpu[i] =
(char *)(dev->mem_start + 2 * BUF_OFFSET_CPU +
2 * RX_RING_SIZE * RX_BUFF_SIZE +
2 * i * TX_BUFF_SIZE);
lp->tx_buf_ptr_lnc[i] =
(BUF_OFFSET_LNC +
RX_RING_SIZE * RX_BUFF_SIZE +
i * TX_BUFF_SIZE);
}
/* Setup I/O ASIC LANCE DMA. */
lp->dma_irq = dec_interrupt[DEC_IRQ_LANCE_MERR];
ioasic_write(IO_REG_LANCE_DMA_P,
CPHYSADDR(dev->mem_start) << 3);
break;
#ifdef CONFIG_TC
case PMAD_LANCE:
dev_set_drvdata(bdev, dev);
start = to_tc_dev(bdev)->resource.start;
len = to_tc_dev(bdev)->resource.end - start + 1;
if (!request_mem_region(start, len, dev_name(bdev))) {
printk(KERN_ERR
"%s: Unable to reserve MMIO resource\n",
dev_name(bdev));
ret = -EBUSY;
goto err_out_dev;
}
dev->mem_start = CKSEG1ADDR(start);
dev->mem_end = dev->mem_start + 0x100000;
dev->base_addr = dev->mem_start + 0x100000;
dev->irq = to_tc_dev(bdev)->interrupt;
esar_base = dev->mem_start + 0x1c0002;
lp->dma_irq = -1;
for (i = 0; i < RX_RING_SIZE; i++) {
lp->rx_buf_ptr_cpu[i] =
(char *)(dev->mem_start + BUF_OFFSET_CPU +
i * RX_BUFF_SIZE);
lp->rx_buf_ptr_lnc[i] =
(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
}
for (i = 0; i < TX_RING_SIZE; i++) {
lp->tx_buf_ptr_cpu[i] =
(char *)(dev->mem_start + BUF_OFFSET_CPU +
RX_RING_SIZE * RX_BUFF_SIZE +
i * TX_BUFF_SIZE);
lp->tx_buf_ptr_lnc[i] =
(BUF_OFFSET_LNC +
RX_RING_SIZE * RX_BUFF_SIZE +
i * TX_BUFF_SIZE);
}
break;
#endif
case PMAX_LANCE:
dev->irq = dec_interrupt[DEC_IRQ_LANCE];
dev->base_addr = CKSEG1ADDR(KN01_SLOT_BASE + KN01_LANCE);
dev->mem_start = CKSEG1ADDR(KN01_SLOT_BASE + KN01_LANCE_MEM);
dev->mem_end = dev->mem_start + KN01_SLOT_SIZE;
esar_base = CKSEG1ADDR(KN01_SLOT_BASE + KN01_ESAR + 1);
lp->dma_irq = -1;
/*
* setup the pointer arrays, this sucks [tm] :-(
*/
for (i = 0; i < RX_RING_SIZE; i++) {
lp->rx_buf_ptr_cpu[i] =
(char *)(dev->mem_start + 2 * BUF_OFFSET_CPU +
2 * i * RX_BUFF_SIZE);
lp->rx_buf_ptr_lnc[i] =
(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
}
for (i = 0; i < TX_RING_SIZE; i++) {
lp->tx_buf_ptr_cpu[i] =
(char *)(dev->mem_start + 2 * BUF_OFFSET_CPU +
2 * RX_RING_SIZE * RX_BUFF_SIZE +
2 * i * TX_BUFF_SIZE);
lp->tx_buf_ptr_lnc[i] =
(BUF_OFFSET_LNC +
RX_RING_SIZE * RX_BUFF_SIZE +
i * TX_BUFF_SIZE);
}
break;
default:
printk(KERN_ERR "%s: declance_init called with unknown type\n",
name);
ret = -ENODEV;
goto err_out_dev;
}
ll = (struct lance_regs *) dev->base_addr;
esar = (unsigned char *) esar_base;
/* prom checks */
/* First, check for test pattern */
if (esar[0x60] != 0xff && esar[0x64] != 0x00 &&
esar[0x68] != 0x55 && esar[0x6c] != 0xaa) {
printk(KERN_ERR
"%s: Ethernet station address prom not found!\n",
name);
ret = -ENODEV;
goto err_out_resource;
}
/* Check the prom contents */
for (i = 0; i < 8; i++) {
if (esar[i * 4] != esar[0x3c - i * 4] &&
esar[i * 4] != esar[0x40 + i * 4] &&
esar[0x3c - i * 4] != esar[0x40 + i * 4]) {
printk(KERN_ERR "%s: Something is wrong with the "
"ethernet station address prom!\n", name);
ret = -ENODEV;
goto err_out_resource;
}
}
/* Copy the ethernet address to the device structure, later to the
* lance initialization block so the lance gets it every time it's
* (re)initialized.
*/
switch (type) {
case ASIC_LANCE:
printk("%s: IOASIC onboard LANCE", name);
break;
case PMAD_LANCE:
printk("%s: PMAD-AA", name);
break;
case PMAX_LANCE:
printk("%s: PMAX onboard LANCE", name);
break;
}
for (i = 0; i < 6; i++)
dev->dev_addr[i] = esar[i * 4];
printk(", addr = %pM, irq = %d\n", dev->dev_addr, dev->irq);
dev->netdev_ops = &lance_netdev_ops;
dev->watchdog_timeo = 5*HZ;
/* lp->ll is the location of the registers for lance card */
lp->ll = ll;
/* busmaster_regval (CSR3) should be zero according to the PMAD-AA
* specification.
*/
lp->busmaster_regval = 0;
dev->dma = 0;
/* We cannot sleep if the chip is busy during a
* multicast list update event, because such events
* can occur from interrupts (ex. IPv6). So we
* use a timer to try again later when necessary. -DaveM
*/
init_timer(&lp->multicast_timer);
lp->multicast_timer.data = (unsigned long) dev;
lp->multicast_timer.function = &lance_set_multicast_retry;
ret = register_netdev(dev);
if (ret) {
printk(KERN_ERR
"%s: Unable to register netdev, aborting.\n", name);
goto err_out_resource;
}
if (!bdev) {
lp->next = root_lance_dev;
root_lance_dev = dev;
}
printk("%s: registered as %s.\n", name, dev->name);
return 0;
err_out_resource:
if (bdev)
release_mem_region(start, len);
err_out_dev:
free_netdev(dev);
err_out:
return ret;
}
static void __exit dec_lance_remove(struct device *bdev)
{
struct net_device *dev = dev_get_drvdata(bdev);
resource_size_t start, len;
unregister_netdev(dev);
start = to_tc_dev(bdev)->resource.start;
len = to_tc_dev(bdev)->resource.end - start + 1;
release_mem_region(start, len);
free_netdev(dev);
}
/* Find all the lance cards on the system and initialize them */
static int __init dec_lance_platform_probe(void)
{
int count = 0;
if (dec_interrupt[DEC_IRQ_LANCE] >= 0) {
if (dec_interrupt[DEC_IRQ_LANCE_MERR] >= 0) {
if (dec_lance_probe(NULL, ASIC_LANCE) >= 0)
count++;
} else if (!TURBOCHANNEL) {
if (dec_lance_probe(NULL, PMAX_LANCE) >= 0)
count++;
}
}
return (count > 0) ? 0 : -ENODEV;
}
static void __exit dec_lance_platform_remove(void)
{
while (root_lance_dev) {
struct net_device *dev = root_lance_dev;
struct lance_private *lp = netdev_priv(dev);
unregister_netdev(dev);
root_lance_dev = lp->next;
free_netdev(dev);
}
}
#ifdef CONFIG_TC
static int __init dec_lance_tc_probe(struct device *dev);
static int __exit dec_lance_tc_remove(struct device *dev);
static const struct tc_device_id dec_lance_tc_table[] = {
{ "DEC ", "PMAD-AA " },
{ }
};
MODULE_DEVICE_TABLE(tc, dec_lance_tc_table);
static struct tc_driver dec_lance_tc_driver = {
.id_table = dec_lance_tc_table,
.driver = {
.name = "declance",
.bus = &tc_bus_type,
.probe = dec_lance_tc_probe,
.remove = __exit_p(dec_lance_tc_remove),
},
};
static int __init dec_lance_tc_probe(struct device *dev)
{
int status = dec_lance_probe(dev, PMAD_LANCE);
if (!status)
get_device(dev);
return status;
}
static int __exit dec_lance_tc_remove(struct device *dev)
{
put_device(dev);
dec_lance_remove(dev);
return 0;
}
#endif
static int __init dec_lance_init(void)
{
int status;
status = tc_register_driver(&dec_lance_tc_driver);
if (!status)
dec_lance_platform_probe();
return status;
}
static void __exit dec_lance_exit(void)
{
dec_lance_platform_remove();
tc_unregister_driver(&dec_lance_tc_driver);
}
module_init(dec_lance_init);
module_exit(dec_lance_exit);
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