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680 lines
22 KiB
680 lines
22 KiB
/*
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* 7990.c -- LANCE ethernet IC generic routines.
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* This is an attempt to separate out the bits of various ethernet
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* drivers that are common because they all use the AMD 7990 LANCE
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* (Local Area Network Controller for Ethernet) chip.
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*
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* Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
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*
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* Most of this stuff was obtained by looking at other LANCE drivers,
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* in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
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* NB: this was made easy by the fact that Jes Sorensen had cleaned up
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* most of a2025 and sunlance with the aim of merging them, so the
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* common code was pretty obvious.
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*/
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#include <linux/crc32.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/in.h>
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#include <linux/route.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <asm/irq.h>
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/* Used for the temporal inet entries and routing */
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#include <linux/socket.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/pgtable.h>
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#ifdef CONFIG_HP300
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#include <asm/blinken.h>
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#endif
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#include "7990.h"
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#define WRITERAP(lp,x) out_be16(lp->base + LANCE_RAP, (x))
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#define WRITERDP(lp,x) out_be16(lp->base + LANCE_RDP, (x))
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#define READRDP(lp) in_be16(lp->base + LANCE_RDP)
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#if defined(CONFIG_HPLANCE) || defined(CONFIG_HPLANCE_MODULE)
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#include "hplance.h"
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#undef WRITERAP
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#undef WRITERDP
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#undef READRDP
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#if defined(CONFIG_MVME147_NET) || defined(CONFIG_MVME147_NET_MODULE)
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/* Lossage Factor Nine, Mr Sulu. */
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#define WRITERAP(lp,x) (lp->writerap(lp,x))
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#define WRITERDP(lp,x) (lp->writerdp(lp,x))
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#define READRDP(lp) (lp->readrdp(lp))
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#else
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/* These inlines can be used if only CONFIG_HPLANCE is defined */
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static inline void WRITERAP(struct lance_private *lp, __u16 value)
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{
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do {
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out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
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} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
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}
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static inline void WRITERDP(struct lance_private *lp, __u16 value)
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{
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do {
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out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
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} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
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}
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static inline __u16 READRDP(struct lance_private *lp)
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{
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__u16 value;
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do {
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value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
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} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
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return value;
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}
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#endif
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#endif /* CONFIG_HPLANCE || CONFIG_HPLANCE_MODULE */
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/* debugging output macros, various flavours */
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/* #define TEST_HITS */
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#ifdef UNDEF
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#define PRINT_RINGS() \
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do { \
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int t; \
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for (t=0; t < RX_RING_SIZE; t++) { \
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printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02X\n",\
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t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0,\
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ib->brx_ring[t].length,\
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ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits);\
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}\
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for (t=0; t < TX_RING_SIZE; t++) { \
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printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02X\n",\
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t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0,\
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ib->btx_ring[t].length,\
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ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits);\
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}\
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} while (0)
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#else
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#define PRINT_RINGS()
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#endif
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/* Load the CSR registers. The LANCE has to be STOPped when we do this! */
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static void load_csrs (struct lance_private *lp)
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{
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volatile struct lance_init_block *aib = lp->lance_init_block;
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int leptr;
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leptr = LANCE_ADDR (aib);
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WRITERAP(lp, LE_CSR1); /* load address of init block */
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WRITERDP(lp, leptr & 0xFFFF);
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WRITERAP(lp, LE_CSR2);
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WRITERDP(lp, leptr >> 16);
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WRITERAP(lp, LE_CSR3);
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WRITERDP(lp, lp->busmaster_regval); /* set byteswap/ALEctrl/byte ctrl */
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/* Point back to csr0 */
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WRITERAP(lp, LE_CSR0);
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}
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/* #define to 0 or 1 appropriately */
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#define DEBUG_IRING 0
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/* Set up the Lance Rx and Tx rings and the init block */
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static void lance_init_ring (struct net_device *dev)
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{
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struct lance_private *lp = netdev_priv(dev);
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volatile struct lance_init_block *ib = lp->init_block;
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volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */
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int leptr;
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int i;
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aib = lp->lance_init_block;
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lp->rx_new = lp->tx_new = 0;
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lp->rx_old = lp->tx_old = 0;
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ib->mode = LE_MO_PROM; /* normal, enable Tx & Rx */
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/* Copy the ethernet address to the lance init block
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* Notice that we do a byteswap if we're big endian.
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* [I think this is the right criterion; at least, sunlance,
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* a2065 and atarilance do the byteswap and lance.c (PC) doesn't.
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* However, the datasheet says that the BSWAP bit doesn't affect
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* the init block, so surely it should be low byte first for
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* everybody? Um.]
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* We could define the ib->physaddr as three 16bit values and
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* use (addr[1] << 8) | addr[0] & co, but this is more efficient.
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*/
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#ifdef __BIG_ENDIAN
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ib->phys_addr [0] = dev->dev_addr [1];
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ib->phys_addr [1] = dev->dev_addr [0];
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ib->phys_addr [2] = dev->dev_addr [3];
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ib->phys_addr [3] = dev->dev_addr [2];
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ib->phys_addr [4] = dev->dev_addr [5];
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ib->phys_addr [5] = dev->dev_addr [4];
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#else
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for (i=0; i<6; i++)
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ib->phys_addr[i] = dev->dev_addr[i];
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#endif
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if (DEBUG_IRING)
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printk ("TX rings:\n");
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lp->tx_full = 0;
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/* Setup the Tx ring entries */
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for (i = 0; i < (1<<lp->lance_log_tx_bufs); i++) {
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leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
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ib->btx_ring [i].tmd0 = leptr;
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ib->btx_ring [i].tmd1_hadr = leptr >> 16;
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ib->btx_ring [i].tmd1_bits = 0;
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ib->btx_ring [i].length = 0xf000; /* The ones required by tmd2 */
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ib->btx_ring [i].misc = 0;
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if (DEBUG_IRING)
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printk ("%d: 0x%8.8x\n", i, leptr);
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}
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/* Setup the Rx ring entries */
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if (DEBUG_IRING)
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printk ("RX rings:\n");
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for (i = 0; i < (1<<lp->lance_log_rx_bufs); i++) {
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leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
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ib->brx_ring [i].rmd0 = leptr;
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ib->brx_ring [i].rmd1_hadr = leptr >> 16;
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ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
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/* 0xf000 == bits that must be one (reserved, presumably) */
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ib->brx_ring [i].length = -RX_BUFF_SIZE | 0xf000;
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ib->brx_ring [i].mblength = 0;
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if (DEBUG_IRING)
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printk ("%d: 0x%8.8x\n", i, leptr);
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}
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/* Setup the initialization block */
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/* Setup rx descriptor pointer */
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leptr = LANCE_ADDR(&aib->brx_ring);
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ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
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ib->rx_ptr = leptr;
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if (DEBUG_IRING)
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printk ("RX ptr: %8.8x\n", leptr);
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/* Setup tx descriptor pointer */
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leptr = LANCE_ADDR(&aib->btx_ring);
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ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
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ib->tx_ptr = leptr;
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if (DEBUG_IRING)
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printk ("TX ptr: %8.8x\n", leptr);
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/* Clear the multicast filter */
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ib->filter [0] = 0;
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ib->filter [1] = 0;
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PRINT_RINGS();
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}
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/* LANCE must be STOPped before we do this, too... */
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static int init_restart_lance (struct lance_private *lp)
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{
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int i;
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WRITERAP(lp, LE_CSR0);
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WRITERDP(lp, LE_C0_INIT);
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/* Need a hook here for sunlance ledma stuff */
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/* Wait for the lance to complete initialization */
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for (i = 0; (i < 100) && !(READRDP(lp) & (LE_C0_ERR | LE_C0_IDON)); i++)
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barrier();
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if ((i == 100) || (READRDP(lp) & LE_C0_ERR)) {
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printk ("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, READRDP(lp));
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return -1;
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}
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/* Clear IDON by writing a "1", enable interrupts and start lance */
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WRITERDP(lp, LE_C0_IDON);
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WRITERDP(lp, LE_C0_INEA | LE_C0_STRT);
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return 0;
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}
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static int lance_reset (struct net_device *dev)
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{
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struct lance_private *lp = netdev_priv(dev);
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int status;
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/* Stop the lance */
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WRITERAP(lp, LE_CSR0);
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WRITERDP(lp, LE_C0_STOP);
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load_csrs (lp);
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lance_init_ring (dev);
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dev->trans_start = jiffies;
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status = init_restart_lance (lp);
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#ifdef DEBUG_DRIVER
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printk ("Lance restart=%d\n", status);
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#endif
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return status;
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}
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static int lance_rx (struct net_device *dev)
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{
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struct lance_private *lp = netdev_priv(dev);
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volatile struct lance_init_block *ib = lp->init_block;
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volatile struct lance_rx_desc *rd;
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unsigned char bits;
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int len = 0; /* XXX shut up gcc warnings */
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struct sk_buff *skb = 0; /* XXX shut up gcc warnings */
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#ifdef TEST_HITS
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int i;
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#endif
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#ifdef TEST_HITS
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printk ("[");
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for (i = 0; i < RX_RING_SIZE; i++) {
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if (i == lp->rx_new)
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printk ("%s",
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ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "_" : "X");
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else
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printk ("%s",
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ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "." : "1");
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}
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printk ("]");
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#endif
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#ifdef CONFIG_HP300
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blinken_leds(0x40, 0);
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#endif
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WRITERDP(lp, LE_C0_RINT | LE_C0_INEA); /* ack Rx int, reenable ints */
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for (rd = &ib->brx_ring [lp->rx_new]; /* For each Rx ring we own... */
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!((bits = rd->rmd1_bits) & LE_R1_OWN);
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rd = &ib->brx_ring [lp->rx_new]) {
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/* We got an incomplete frame? */
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if ((bits & LE_R1_POK) != LE_R1_POK) {
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lp->stats.rx_over_errors++;
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lp->stats.rx_errors++;
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continue;
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} else if (bits & LE_R1_ERR) {
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/* Count only the end frame as a rx error,
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* not the beginning
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*/
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if (bits & LE_R1_BUF) lp->stats.rx_fifo_errors++;
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if (bits & LE_R1_CRC) lp->stats.rx_crc_errors++;
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if (bits & LE_R1_OFL) lp->stats.rx_over_errors++;
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if (bits & LE_R1_FRA) lp->stats.rx_frame_errors++;
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if (bits & LE_R1_EOP) lp->stats.rx_errors++;
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} else {
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len = (rd->mblength & 0xfff) - 4;
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skb = dev_alloc_skb (len+2);
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if (skb == 0) {
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printk ("%s: Memory squeeze, deferring packet.\n",
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dev->name);
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lp->stats.rx_dropped++;
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rd->mblength = 0;
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rd->rmd1_bits = LE_R1_OWN;
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lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
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return 0;
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}
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skb_reserve (skb, 2); /* 16 byte align */
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skb_put (skb, len); /* make room */
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eth_copy_and_sum(skb,
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(unsigned char *)&(ib->rx_buf [lp->rx_new][0]),
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len, 0);
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skb->protocol = eth_type_trans (skb, dev);
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netif_rx (skb);
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dev->last_rx = jiffies;
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lp->stats.rx_packets++;
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lp->stats.rx_bytes += len;
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}
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/* Return the packet to the pool */
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rd->mblength = 0;
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rd->rmd1_bits = LE_R1_OWN;
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lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
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}
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return 0;
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}
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static int lance_tx (struct net_device *dev)
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{
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struct lance_private *lp = netdev_priv(dev);
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volatile struct lance_init_block *ib = lp->init_block;
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volatile struct lance_tx_desc *td;
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int i, j;
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int status;
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#ifdef CONFIG_HP300
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blinken_leds(0x80, 0);
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#endif
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/* csr0 is 2f3 */
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WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
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/* csr0 is 73 */
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j = lp->tx_old;
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for (i = j; i != lp->tx_new; i = j) {
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td = &ib->btx_ring [i];
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/* If we hit a packet not owned by us, stop */
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if (td->tmd1_bits & LE_T1_OWN)
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break;
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if (td->tmd1_bits & LE_T1_ERR) {
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status = td->misc;
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lp->stats.tx_errors++;
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if (status & LE_T3_RTY) lp->stats.tx_aborted_errors++;
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if (status & LE_T3_LCOL) lp->stats.tx_window_errors++;
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if (status & LE_T3_CLOS) {
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lp->stats.tx_carrier_errors++;
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if (lp->auto_select) {
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lp->tpe = 1 - lp->tpe;
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printk("%s: Carrier Lost, trying %s\n",
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dev->name, lp->tpe?"TPE":"AUI");
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/* Stop the lance */
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WRITERAP(lp, LE_CSR0);
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WRITERDP(lp, LE_C0_STOP);
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lance_init_ring (dev);
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load_csrs (lp);
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init_restart_lance (lp);
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return 0;
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}
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}
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/* buffer errors and underflows turn off the transmitter */
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/* Restart the adapter */
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if (status & (LE_T3_BUF|LE_T3_UFL)) {
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lp->stats.tx_fifo_errors++;
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printk ("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
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dev->name);
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/* Stop the lance */
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WRITERAP(lp, LE_CSR0);
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WRITERDP(lp, LE_C0_STOP);
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lance_init_ring (dev);
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load_csrs (lp);
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init_restart_lance (lp);
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return 0;
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}
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} else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
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/*
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* So we don't count the packet more than once.
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*/
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td->tmd1_bits &= ~(LE_T1_POK);
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/* One collision before packet was sent. */
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if (td->tmd1_bits & LE_T1_EONE)
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lp->stats.collisions++;
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/* More than one collision, be optimistic. */
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if (td->tmd1_bits & LE_T1_EMORE)
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lp->stats.collisions += 2;
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lp->stats.tx_packets++;
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}
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j = (j + 1) & lp->tx_ring_mod_mask;
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}
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lp->tx_old = j;
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WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
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return 0;
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}
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static irqreturn_t
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lance_interrupt (int irq, void *dev_id)
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{
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struct net_device *dev = (struct net_device *)dev_id;
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struct lance_private *lp = netdev_priv(dev);
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int csr0;
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spin_lock (&lp->devlock);
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WRITERAP(lp, LE_CSR0); /* LANCE Controller Status */
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csr0 = READRDP(lp);
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PRINT_RINGS();
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if (!(csr0 & LE_C0_INTR)) { /* Check if any interrupt has */
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spin_unlock (&lp->devlock);
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return IRQ_NONE; /* been generated by the Lance. */
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}
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/* Acknowledge all the interrupt sources ASAP */
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WRITERDP(lp, csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
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if ((csr0 & LE_C0_ERR)) {
|
|
/* Clear the error condition */
|
|
WRITERDP(lp, LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
|
|
}
|
|
|
|
if (csr0 & LE_C0_RINT)
|
|
lance_rx (dev);
|
|
|
|
if (csr0 & LE_C0_TINT)
|
|
lance_tx (dev);
|
|
|
|
/* Log misc errors. */
|
|
if (csr0 & LE_C0_BABL)
|
|
lp->stats.tx_errors++; /* Tx babble. */
|
|
if (csr0 & LE_C0_MISS)
|
|
lp->stats.rx_errors++; /* Missed a Rx frame. */
|
|
if (csr0 & LE_C0_MERR) {
|
|
printk("%s: Bus master arbitration failure, status %4.4x.\n",
|
|
dev->name, csr0);
|
|
/* Restart the chip. */
|
|
WRITERDP(lp, LE_C0_STRT);
|
|
}
|
|
|
|
if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {
|
|
lp->tx_full = 0;
|
|
netif_wake_queue (dev);
|
|
}
|
|
|
|
WRITERAP(lp, LE_CSR0);
|
|
WRITERDP(lp, LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
|
|
|
|
spin_unlock (&lp->devlock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
int lance_open (struct net_device *dev)
|
|
{
|
|
struct lance_private *lp = netdev_priv(dev);
|
|
int res;
|
|
|
|
/* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
|
|
if (request_irq(lp->irq, lance_interrupt, IRQF_SHARED, lp->name, dev))
|
|
return -EAGAIN;
|
|
|
|
res = lance_reset(dev);
|
|
spin_lock_init(&lp->devlock);
|
|
netif_start_queue (dev);
|
|
|
|
return res;
|
|
}
|
|
|
|
int lance_close (struct net_device *dev)
|
|
{
|
|
struct lance_private *lp = netdev_priv(dev);
|
|
|
|
netif_stop_queue (dev);
|
|
|
|
/* Stop the LANCE */
|
|
WRITERAP(lp, LE_CSR0);
|
|
WRITERDP(lp, LE_C0_STOP);
|
|
|
|
free_irq(lp->irq, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void lance_tx_timeout(struct net_device *dev)
|
|
{
|
|
printk("lance_tx_timeout\n");
|
|
lance_reset(dev);
|
|
dev->trans_start = jiffies;
|
|
netif_wake_queue (dev);
|
|
}
|
|
|
|
|
|
int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct lance_private *lp = netdev_priv(dev);
|
|
volatile struct lance_init_block *ib = lp->init_block;
|
|
int entry, skblen, len;
|
|
static int outs;
|
|
unsigned long flags;
|
|
|
|
if (!TX_BUFFS_AVAIL)
|
|
return -1;
|
|
|
|
netif_stop_queue (dev);
|
|
|
|
skblen = skb->len;
|
|
|
|
#ifdef DEBUG_DRIVER
|
|
/* dump the packet */
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 64; i++) {
|
|
if ((i % 16) == 0)
|
|
printk ("\n");
|
|
printk ("%2.2x ", skb->data [i]);
|
|
}
|
|
}
|
|
#endif
|
|
len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
|
|
entry = lp->tx_new & lp->tx_ring_mod_mask;
|
|
ib->btx_ring [entry].length = (-len) | 0xf000;
|
|
ib->btx_ring [entry].misc = 0;
|
|
|
|
if (skb->len < ETH_ZLEN)
|
|
memset((void *)&ib->tx_buf[entry][0], 0, ETH_ZLEN);
|
|
skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);
|
|
|
|
/* Now, give the packet to the lance */
|
|
ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
|
|
lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
|
|
|
|
outs++;
|
|
/* Kick the lance: transmit now */
|
|
WRITERDP(lp, LE_C0_INEA | LE_C0_TDMD);
|
|
dev->trans_start = jiffies;
|
|
dev_kfree_skb (skb);
|
|
|
|
spin_lock_irqsave (&lp->devlock, flags);
|
|
if (TX_BUFFS_AVAIL)
|
|
netif_start_queue (dev);
|
|
else
|
|
lp->tx_full = 1;
|
|
spin_unlock_irqrestore (&lp->devlock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct net_device_stats *lance_get_stats (struct net_device *dev)
|
|
{
|
|
struct lance_private *lp = netdev_priv(dev);
|
|
|
|
return &lp->stats;
|
|
}
|
|
|
|
/* taken from the depca driver via a2065.c */
|
|
static void lance_load_multicast (struct net_device *dev)
|
|
{
|
|
struct lance_private *lp = netdev_priv(dev);
|
|
volatile struct lance_init_block *ib = lp->init_block;
|
|
volatile u16 *mcast_table = (u16 *)&ib->filter;
|
|
struct dev_mc_list *dmi=dev->mc_list;
|
|
char *addrs;
|
|
int i;
|
|
u32 crc;
|
|
|
|
/* set all multicast bits */
|
|
if (dev->flags & IFF_ALLMULTI){
|
|
ib->filter [0] = 0xffffffff;
|
|
ib->filter [1] = 0xffffffff;
|
|
return;
|
|
}
|
|
/* clear the multicast filter */
|
|
ib->filter [0] = 0;
|
|
ib->filter [1] = 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(6, addrs);
|
|
crc = crc >> 26;
|
|
mcast_table [crc >> 4] |= 1 << (crc & 0xf);
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
void lance_set_multicast (struct net_device *dev)
|
|
{
|
|
struct lance_private *lp = netdev_priv(dev);
|
|
volatile struct lance_init_block *ib = lp->init_block;
|
|
int stopped;
|
|
|
|
stopped = netif_queue_stopped(dev);
|
|
if (!stopped)
|
|
netif_stop_queue (dev);
|
|
|
|
while (lp->tx_old != lp->tx_new)
|
|
schedule();
|
|
|
|
WRITERAP(lp, LE_CSR0);
|
|
WRITERDP(lp, LE_C0_STOP);
|
|
lance_init_ring (dev);
|
|
|
|
if (dev->flags & IFF_PROMISC) {
|
|
ib->mode |= LE_MO_PROM;
|
|
} else {
|
|
ib->mode &= ~LE_MO_PROM;
|
|
lance_load_multicast (dev);
|
|
}
|
|
load_csrs (lp);
|
|
init_restart_lance (lp);
|
|
|
|
if (!stopped)
|
|
netif_start_queue (dev);
|
|
}
|
|
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
void lance_poll(struct net_device *dev)
|
|
{
|
|
struct lance_private *lp = netdev_priv(dev);
|
|
|
|
spin_lock (&lp->devlock);
|
|
WRITERAP(lp, LE_CSR0);
|
|
WRITERDP(lp, LE_C0_STRT);
|
|
spin_unlock (&lp->devlock);
|
|
lance_interrupt(dev->irq, dev);
|
|
}
|
|
#endif
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|