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1313 lines
40 KiB
1313 lines
40 KiB
/* lance.c: An AMD LANCE/PCnet ethernet driver for Linux. */ |
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/* |
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Written/copyright 1993-1998 by Donald Becker. |
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|
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Copyright 1993 United States Government as represented by the |
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Director, National Security Agency. |
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This software may be used and distributed according to the terms |
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of the GNU General Public License, incorporated herein by reference. |
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|
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This driver is for the Allied Telesis AT1500 and HP J2405A, and should work |
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with most other LANCE-based bus-master (NE2100/NE2500) ethercards. |
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|
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The author may be reached as [email protected], or C/O |
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Scyld Computing Corporation |
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410 Severn Ave., Suite 210 |
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Annapolis MD 21403 |
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|
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Andrey V. Savochkin: |
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- alignment problem with 1.3.* kernel and some minor changes. |
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Thomas Bogendoerfer ([email protected]): |
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- added support for Linux/Alpha, but removed most of it, because |
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it worked only for the PCI chip. |
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- added hook for the 32bit lance driver |
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- added PCnetPCI II (79C970A) to chip table |
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Paul Gortmaker ([email protected]): |
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- hopefully fix above so Linux/Alpha can use ISA cards too. |
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8/20/96 Fixed 7990 autoIRQ failure and reversed unneeded alignment -djb |
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v1.12 10/27/97 Module support -djb |
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v1.14 2/3/98 Module support modified, made PCI support optional -djb |
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v1.15 5/27/99 Fixed bug in the cleanup_module(). dev->priv was freed |
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before unregister_netdev() which caused NULL pointer |
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reference later in the chain (in rtnetlink_fill_ifinfo()) |
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-- Mika Kuoppala <[email protected]> |
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|
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Forward ported v1.14 to 2.1.129, merged the PCI and misc changes from |
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the 2.1 version of the old driver - Alan Cox |
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|
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Get rid of check_region, check kmalloc return in lance_probe1 |
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Arnaldo Carvalho de Melo <[email protected]> - 11/01/2001 |
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Reworked detection, added support for Racal InterLan EtherBlaster cards |
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Vesselin Kostadinov <vesok at yahoo dot com > - 22/4/2004 |
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*/ |
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|
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static const char version[] = "lance.c:v1.16 2006/11/09 [email protected], [email protected]\n"; |
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|
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/delay.h> |
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#include <linux/errno.h> |
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#include <linux/ioport.h> |
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#include <linux/slab.h> |
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#include <linux/interrupt.h> |
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#include <linux/pci.h> |
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#include <linux/init.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/mm.h> |
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#include <linux/bitops.h> |
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|
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#include <asm/io.h> |
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#include <asm/dma.h> |
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|
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static unsigned int lance_portlist[] __initdata = { 0x300, 0x320, 0x340, 0x360, 0}; |
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static int lance_probe1(struct net_device *dev, int ioaddr, int irq, int options); |
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static int __init do_lance_probe(struct net_device *dev); |
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|
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static struct card { |
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char id_offset14; |
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char id_offset15; |
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} cards[] = { |
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{ //"normal" |
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.id_offset14 = 0x57, |
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.id_offset15 = 0x57, |
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}, |
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{ //NI6510EB |
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.id_offset14 = 0x52, |
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.id_offset15 = 0x44, |
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}, |
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{ //Racal InterLan EtherBlaster |
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.id_offset14 = 0x52, |
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.id_offset15 = 0x49, |
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}, |
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}; |
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#define NUM_CARDS 3 |
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|
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#ifdef LANCE_DEBUG |
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static int lance_debug = LANCE_DEBUG; |
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#else |
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static int lance_debug = 1; |
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#endif |
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|
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/* |
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Theory of Operation |
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|
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I. Board Compatibility |
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|
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This device driver is designed for the AMD 79C960, the "PCnet-ISA |
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single-chip ethernet controller for ISA". This chip is used in a wide |
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variety of boards from vendors such as Allied Telesis, HP, Kingston, |
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and Boca. This driver is also intended to work with older AMD 7990 |
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designs, such as the NE1500 and NE2100, and newer 79C961. For convenience, |
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I use the name LANCE to refer to all of the AMD chips, even though it properly |
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refers only to the original 7990. |
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|
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II. Board-specific settings |
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|
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The driver is designed to work the boards that use the faster |
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bus-master mode, rather than in shared memory mode. (Only older designs |
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have on-board buffer memory needed to support the slower shared memory mode.) |
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|
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Most ISA boards have jumpered settings for the I/O base, IRQ line, and DMA |
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channel. This driver probes the likely base addresses: |
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{0x300, 0x320, 0x340, 0x360}. |
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After the board is found it generates a DMA-timeout interrupt and uses |
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autoIRQ to find the IRQ line. The DMA channel can be set with the low bits |
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of the otherwise-unused dev->mem_start value (aka PARAM1). If unset it is |
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probed for by enabling each free DMA channel in turn and checking if |
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initialization succeeds. |
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|
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The HP-J2405A board is an exception: with this board it is easy to read the |
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EEPROM-set values for the base, IRQ, and DMA. (Of course you must already |
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_know_ the base address -- that field is for writing the EEPROM.) |
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|
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III. Driver operation |
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|
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IIIa. Ring buffers |
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The LANCE uses ring buffers of Tx and Rx descriptors. Each entry describes |
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the base and length of the data buffer, along with status bits. The length |
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of these buffers is set by LANCE_LOG_{RX,TX}_BUFFERS, which is log_2() of |
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the buffer length (rather than being directly the buffer length) for |
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implementation ease. The current values are 2 (Tx) and 4 (Rx), which leads to |
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ring sizes of 4 (Tx) and 16 (Rx). Increasing the number of ring entries |
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needlessly uses extra space and reduces the chance that an upper layer will |
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be able to reorder queued Tx packets based on priority. Decreasing the number |
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of entries makes it more difficult to achieve back-to-back packet transmission |
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and increases the chance that Rx ring will overflow. (Consider the worst case |
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of receiving back-to-back minimum-sized packets.) |
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|
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The LANCE has the capability to "chain" both Rx and Tx buffers, but this driver |
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statically allocates full-sized (slightly oversized -- PKT_BUF_SZ) buffers to |
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avoid the administrative overhead. For the Rx side this avoids dynamically |
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allocating full-sized buffers "just in case", at the expense of a |
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memory-to-memory data copy for each packet received. For most systems this |
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is a good tradeoff: the Rx buffer will always be in low memory, the copy |
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is inexpensive, and it primes the cache for later packet processing. For Tx |
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the buffers are only used when needed as low-memory bounce buffers. |
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|
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IIIB. 16M memory limitations. |
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For the ISA bus master mode all structures used directly by the LANCE, |
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the initialization block, Rx and Tx rings, and data buffers, must be |
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accessible from the ISA bus, i.e. in the lower 16M of real memory. |
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This is a problem for current Linux kernels on >16M machines. The network |
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devices are initialized after memory initialization, and the kernel doles out |
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memory from the top of memory downward. The current solution is to have a |
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special network initialization routine that's called before memory |
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initialization; this will eventually be generalized for all network devices. |
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As mentioned before, low-memory "bounce-buffers" are used when needed. |
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|
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IIIC. Synchronization |
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The driver runs as two independent, single-threaded flows of control. One |
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is the send-packet routine, which enforces single-threaded use by the |
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dev->tbusy flag. The other thread is the interrupt handler, which is single |
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threaded by the hardware and other software. |
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|
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The send packet thread has partial control over the Tx ring and 'dev->tbusy' |
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flag. It sets the tbusy flag whenever it's queuing a Tx packet. If the next |
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queue slot is empty, it clears the tbusy flag when finished otherwise it sets |
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the 'lp->tx_full' flag. |
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|
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The interrupt handler has exclusive control over the Rx ring and records stats |
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from the Tx ring. (The Tx-done interrupt can't be selectively turned off, so |
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we can't avoid the interrupt overhead by having the Tx routine reap the Tx |
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stats.) After reaping the stats, it marks the queue entry as empty by setting |
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the 'base' to zero. Iff the 'lp->tx_full' flag is set, it clears both the |
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tx_full and tbusy flags. |
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|
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*/ |
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|
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/* Set the number of Tx and Rx buffers, using Log_2(# buffers). |
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Reasonable default values are 16 Tx buffers, and 16 Rx buffers. |
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That translates to 4 and 4 (16 == 2^^4). |
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This is a compile-time option for efficiency. |
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*/ |
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#ifndef LANCE_LOG_TX_BUFFERS |
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#define LANCE_LOG_TX_BUFFERS 4 |
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#define LANCE_LOG_RX_BUFFERS 4 |
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#endif |
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|
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#define TX_RING_SIZE (1 << (LANCE_LOG_TX_BUFFERS)) |
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#define TX_RING_MOD_MASK (TX_RING_SIZE - 1) |
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#define TX_RING_LEN_BITS ((LANCE_LOG_TX_BUFFERS) << 29) |
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|
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#define RX_RING_SIZE (1 << (LANCE_LOG_RX_BUFFERS)) |
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#define RX_RING_MOD_MASK (RX_RING_SIZE - 1) |
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#define RX_RING_LEN_BITS ((LANCE_LOG_RX_BUFFERS) << 29) |
|
|
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#define PKT_BUF_SZ 1544 |
|
|
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/* Offsets from base I/O address. */ |
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#define LANCE_DATA 0x10 |
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#define LANCE_ADDR 0x12 |
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#define LANCE_RESET 0x14 |
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#define LANCE_BUS_IF 0x16 |
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#define LANCE_TOTAL_SIZE 0x18 |
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|
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#define TX_TIMEOUT (HZ/5) |
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|
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/* The LANCE Rx and Tx ring descriptors. */ |
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struct lance_rx_head { |
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s32 base; |
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s16 buf_length; /* This length is 2s complement (negative)! */ |
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s16 msg_length; /* This length is "normal". */ |
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}; |
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|
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struct lance_tx_head { |
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s32 base; |
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s16 length; /* Length is 2s complement (negative)! */ |
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s16 misc; |
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}; |
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|
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/* The LANCE initialization block, described in databook. */ |
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struct lance_init_block { |
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u16 mode; /* Pre-set mode (reg. 15) */ |
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u8 phys_addr[6]; /* Physical ethernet address */ |
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u32 filter[2]; /* Multicast filter (unused). */ |
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/* Receive and transmit ring base, along with extra bits. */ |
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u32 rx_ring; /* Tx and Rx ring base pointers */ |
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u32 tx_ring; |
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}; |
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|
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struct lance_private { |
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/* The Tx and Rx ring entries must be aligned on 8-byte boundaries. */ |
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struct lance_rx_head rx_ring[RX_RING_SIZE]; |
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struct lance_tx_head tx_ring[TX_RING_SIZE]; |
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struct lance_init_block init_block; |
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const char *name; |
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/* The saved address of a sent-in-place packet/buffer, for skfree(). */ |
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struct sk_buff* tx_skbuff[TX_RING_SIZE]; |
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/* The addresses of receive-in-place skbuffs. */ |
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struct sk_buff* rx_skbuff[RX_RING_SIZE]; |
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unsigned long rx_buffs; /* Address of Rx and Tx buffers. */ |
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/* Tx low-memory "bounce buffer" address. */ |
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char (*tx_bounce_buffs)[PKT_BUF_SZ]; |
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int cur_rx, cur_tx; /* The next free ring entry */ |
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int dirty_rx, dirty_tx; /* The ring entries to be free()ed. */ |
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int dma; |
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unsigned char chip_version; /* See lance_chip_type. */ |
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spinlock_t devlock; |
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}; |
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#define LANCE_MUST_PAD 0x00000001 |
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#define LANCE_ENABLE_AUTOSELECT 0x00000002 |
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#define LANCE_MUST_REINIT_RING 0x00000004 |
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#define LANCE_MUST_UNRESET 0x00000008 |
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#define LANCE_HAS_MISSED_FRAME 0x00000010 |
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|
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/* A mapping from the chip ID number to the part number and features. |
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These are from the datasheets -- in real life the '970 version |
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reportedly has the same ID as the '965. */ |
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static struct lance_chip_type { |
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int id_number; |
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const char *name; |
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int flags; |
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} chip_table[] = { |
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{0x0000, "LANCE 7990", /* Ancient lance chip. */ |
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LANCE_MUST_PAD + LANCE_MUST_UNRESET}, |
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{0x0003, "PCnet/ISA 79C960", /* 79C960 PCnet/ISA. */ |
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LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + |
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LANCE_HAS_MISSED_FRAME}, |
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{0x2260, "PCnet/ISA+ 79C961", /* 79C961 PCnet/ISA+, Plug-n-Play. */ |
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LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + |
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LANCE_HAS_MISSED_FRAME}, |
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{0x2420, "PCnet/PCI 79C970", /* 79C970 or 79C974 PCnet-SCSI, PCI. */ |
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LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + |
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LANCE_HAS_MISSED_FRAME}, |
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/* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call |
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it the PCnet32. */ |
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{0x2430, "PCnet32", /* 79C965 PCnet for VL bus. */ |
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LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + |
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LANCE_HAS_MISSED_FRAME}, |
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{0x2621, "PCnet/PCI-II 79C970A", /* 79C970A PCInetPCI II. */ |
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LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + |
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LANCE_HAS_MISSED_FRAME}, |
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{0x0, "PCnet (unknown)", |
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LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + |
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LANCE_HAS_MISSED_FRAME}, |
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}; |
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|
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enum {OLD_LANCE = 0, PCNET_ISA=1, PCNET_ISAP=2, PCNET_PCI=3, PCNET_VLB=4, PCNET_PCI_II=5, LANCE_UNKNOWN=6}; |
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|
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/* Non-zero if lance_probe1() needs to allocate low-memory bounce buffers. |
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Assume yes until we know the memory size. */ |
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static unsigned char lance_need_isa_bounce_buffers = 1; |
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|
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static int lance_open(struct net_device *dev); |
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static void lance_init_ring(struct net_device *dev, gfp_t mode); |
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static netdev_tx_t lance_start_xmit(struct sk_buff *skb, |
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struct net_device *dev); |
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static int lance_rx(struct net_device *dev); |
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static irqreturn_t lance_interrupt(int irq, void *dev_id); |
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static int lance_close(struct net_device *dev); |
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static struct net_device_stats *lance_get_stats(struct net_device *dev); |
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static void set_multicast_list(struct net_device *dev); |
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static void lance_tx_timeout (struct net_device *dev, unsigned int txqueue); |
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|
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#ifdef MODULE |
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#define MAX_CARDS 8 /* Max number of interfaces (cards) per module */ |
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|
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static struct net_device *dev_lance[MAX_CARDS]; |
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static int io[MAX_CARDS]; |
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static int dma[MAX_CARDS]; |
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static int irq[MAX_CARDS]; |
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|
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module_param_hw_array(io, int, ioport, NULL, 0); |
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module_param_hw_array(dma, int, dma, NULL, 0); |
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module_param_hw_array(irq, int, irq, NULL, 0); |
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module_param(lance_debug, int, 0); |
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MODULE_PARM_DESC(io, "LANCE/PCnet I/O base address(es),required"); |
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MODULE_PARM_DESC(dma, "LANCE/PCnet ISA DMA channel (ignored for some devices)"); |
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MODULE_PARM_DESC(irq, "LANCE/PCnet IRQ number (ignored for some devices)"); |
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MODULE_PARM_DESC(lance_debug, "LANCE/PCnet debug level (0-7)"); |
|
|
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static int __init lance_init_module(void) |
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{ |
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struct net_device *dev; |
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int this_dev, found = 0; |
|
|
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for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) { |
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if (io[this_dev] == 0) { |
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if (this_dev != 0) /* only complain once */ |
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break; |
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printk(KERN_NOTICE "lance.c: Module autoprobing not allowed. Append \"io=0xNNN\" value(s).\n"); |
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return -EPERM; |
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} |
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dev = alloc_etherdev(0); |
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if (!dev) |
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break; |
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dev->irq = irq[this_dev]; |
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dev->base_addr = io[this_dev]; |
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dev->dma = dma[this_dev]; |
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if (do_lance_probe(dev) == 0) { |
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dev_lance[found++] = dev; |
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continue; |
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} |
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free_netdev(dev); |
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break; |
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} |
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if (found != 0) |
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return 0; |
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return -ENXIO; |
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} |
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module_init(lance_init_module); |
|
|
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static void cleanup_card(struct net_device *dev) |
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{ |
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struct lance_private *lp = dev->ml_priv; |
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if (dev->dma != 4) |
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free_dma(dev->dma); |
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release_region(dev->base_addr, LANCE_TOTAL_SIZE); |
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kfree(lp->tx_bounce_buffs); |
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kfree((void*)lp->rx_buffs); |
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kfree(lp); |
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} |
|
|
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static void __exit lance_cleanup_module(void) |
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{ |
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int this_dev; |
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|
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for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) { |
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struct net_device *dev = dev_lance[this_dev]; |
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if (dev) { |
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unregister_netdev(dev); |
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cleanup_card(dev); |
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free_netdev(dev); |
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} |
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} |
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} |
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module_exit(lance_cleanup_module); |
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#endif /* MODULE */ |
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MODULE_LICENSE("GPL"); |
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|
|
|
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/* Starting in v2.1.*, the LANCE/PCnet probe is now similar to the other |
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board probes now that kmalloc() can allocate ISA DMA-able regions. |
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This also allows the LANCE driver to be used as a module. |
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*/ |
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static int __init do_lance_probe(struct net_device *dev) |
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{ |
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unsigned int *port; |
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int result; |
|
|
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if (high_memory <= phys_to_virt(16*1024*1024)) |
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lance_need_isa_bounce_buffers = 0; |
|
|
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for (port = lance_portlist; *port; port++) { |
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int ioaddr = *port; |
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struct resource *r = request_region(ioaddr, LANCE_TOTAL_SIZE, |
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"lance-probe"); |
|
|
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if (r) { |
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/* Detect the card with minimal I/O reads */ |
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char offset14 = inb(ioaddr + 14); |
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int card; |
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for (card = 0; card < NUM_CARDS; ++card) |
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if (cards[card].id_offset14 == offset14) |
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break; |
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if (card < NUM_CARDS) {/*yes, the first byte matches*/ |
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char offset15 = inb(ioaddr + 15); |
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for (card = 0; card < NUM_CARDS; ++card) |
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if ((cards[card].id_offset14 == offset14) && |
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(cards[card].id_offset15 == offset15)) |
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break; |
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} |
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if (card < NUM_CARDS) { /*Signature OK*/ |
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result = lance_probe1(dev, ioaddr, 0, 0); |
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if (!result) { |
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struct lance_private *lp = dev->ml_priv; |
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int ver = lp->chip_version; |
|
|
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r->name = chip_table[ver].name; |
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return 0; |
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} |
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} |
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release_region(ioaddr, LANCE_TOTAL_SIZE); |
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} |
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} |
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return -ENODEV; |
|
} |
|
|
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#ifndef MODULE |
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struct net_device * __init lance_probe(int unit) |
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{ |
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struct net_device *dev = alloc_etherdev(0); |
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int err; |
|
|
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if (!dev) |
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return ERR_PTR(-ENODEV); |
|
|
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sprintf(dev->name, "eth%d", unit); |
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netdev_boot_setup_check(dev); |
|
|
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err = do_lance_probe(dev); |
|
if (err) |
|
goto out; |
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return dev; |
|
out: |
|
free_netdev(dev); |
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return ERR_PTR(err); |
|
} |
|
#endif |
|
|
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static const struct net_device_ops lance_netdev_ops = { |
|
.ndo_open = lance_open, |
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.ndo_start_xmit = lance_start_xmit, |
|
.ndo_stop = lance_close, |
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.ndo_get_stats = lance_get_stats, |
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.ndo_set_rx_mode = set_multicast_list, |
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.ndo_tx_timeout = lance_tx_timeout, |
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.ndo_set_mac_address = eth_mac_addr, |
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.ndo_validate_addr = eth_validate_addr, |
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}; |
|
|
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static int __init lance_probe1(struct net_device *dev, int ioaddr, int irq, int options) |
|
{ |
|
struct lance_private *lp; |
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unsigned long dma_channels; /* Mark spuriously-busy DMA channels */ |
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int i, reset_val, lance_version; |
|
const char *chipname; |
|
/* Flags for specific chips or boards. */ |
|
unsigned char hpJ2405A = 0; /* HP ISA adaptor */ |
|
int hp_builtin = 0; /* HP on-board ethernet. */ |
|
static int did_version; /* Already printed version info. */ |
|
unsigned long flags; |
|
int err = -ENOMEM; |
|
void __iomem *bios; |
|
|
|
/* First we look for special cases. |
|
Check for HP's on-board ethernet by looking for 'HP' in the BIOS. |
|
There are two HP versions, check the BIOS for the configuration port. |
|
This method provided by L. Julliard, [email protected]. |
|
*/ |
|
bios = ioremap(0xf00f0, 0x14); |
|
if (!bios) |
|
return -ENOMEM; |
|
if (readw(bios + 0x12) == 0x5048) { |
|
static const short ioaddr_table[] = { 0x300, 0x320, 0x340, 0x360}; |
|
int hp_port = (readl(bios + 1) & 1) ? 0x499 : 0x99; |
|
/* We can have boards other than the built-in! Verify this is on-board. */ |
|
if ((inb(hp_port) & 0xc0) == 0x80 && |
|
ioaddr_table[inb(hp_port) & 3] == ioaddr) |
|
hp_builtin = hp_port; |
|
} |
|
iounmap(bios); |
|
/* We also recognize the HP Vectra on-board here, but check below. */ |
|
hpJ2405A = (inb(ioaddr) == 0x08 && inb(ioaddr+1) == 0x00 && |
|
inb(ioaddr+2) == 0x09); |
|
|
|
/* Reset the LANCE. */ |
|
reset_val = inw(ioaddr+LANCE_RESET); /* Reset the LANCE */ |
|
|
|
/* The Un-Reset needed is only needed for the real NE2100, and will |
|
confuse the HP board. */ |
|
if (!hpJ2405A) |
|
outw(reset_val, ioaddr+LANCE_RESET); |
|
|
|
outw(0x0000, ioaddr+LANCE_ADDR); /* Switch to window 0 */ |
|
if (inw(ioaddr+LANCE_DATA) != 0x0004) |
|
return -ENODEV; |
|
|
|
/* Get the version of the chip. */ |
|
outw(88, ioaddr+LANCE_ADDR); |
|
if (inw(ioaddr+LANCE_ADDR) != 88) { |
|
lance_version = 0; |
|
} else { /* Good, it's a newer chip. */ |
|
int chip_version = inw(ioaddr+LANCE_DATA); |
|
outw(89, ioaddr+LANCE_ADDR); |
|
chip_version |= inw(ioaddr+LANCE_DATA) << 16; |
|
if (lance_debug > 2) |
|
printk(" LANCE chip version is %#x.\n", chip_version); |
|
if ((chip_version & 0xfff) != 0x003) |
|
return -ENODEV; |
|
chip_version = (chip_version >> 12) & 0xffff; |
|
for (lance_version = 1; chip_table[lance_version].id_number; lance_version++) { |
|
if (chip_table[lance_version].id_number == chip_version) |
|
break; |
|
} |
|
} |
|
|
|
/* We can't allocate private data from alloc_etherdev() because it must |
|
a ISA DMA-able region. */ |
|
chipname = chip_table[lance_version].name; |
|
printk("%s: %s at %#3x, ", dev->name, chipname, ioaddr); |
|
|
|
/* There is a 16 byte station address PROM at the base address. |
|
The first six bytes are the station address. */ |
|
for (i = 0; i < 6; i++) |
|
dev->dev_addr[i] = inb(ioaddr + i); |
|
printk("%pM", dev->dev_addr); |
|
|
|
dev->base_addr = ioaddr; |
|
/* Make certain the data structures used by the LANCE are aligned and DMAble. */ |
|
|
|
lp = kzalloc(sizeof(*lp), GFP_DMA | GFP_KERNEL); |
|
if (!lp) |
|
return -ENOMEM; |
|
if (lance_debug > 6) printk(" (#0x%05lx)", (unsigned long)lp); |
|
dev->ml_priv = lp; |
|
lp->name = chipname; |
|
lp->rx_buffs = (unsigned long)kmalloc_array(RX_RING_SIZE, PKT_BUF_SZ, |
|
GFP_DMA | GFP_KERNEL); |
|
if (!lp->rx_buffs) |
|
goto out_lp; |
|
if (lance_need_isa_bounce_buffers) { |
|
lp->tx_bounce_buffs = kmalloc_array(TX_RING_SIZE, PKT_BUF_SZ, |
|
GFP_DMA | GFP_KERNEL); |
|
if (!lp->tx_bounce_buffs) |
|
goto out_rx; |
|
} else |
|
lp->tx_bounce_buffs = NULL; |
|
|
|
lp->chip_version = lance_version; |
|
spin_lock_init(&lp->devlock); |
|
|
|
lp->init_block.mode = 0x0003; /* Disable Rx and Tx. */ |
|
for (i = 0; i < 6; i++) |
|
lp->init_block.phys_addr[i] = dev->dev_addr[i]; |
|
lp->init_block.filter[0] = 0x00000000; |
|
lp->init_block.filter[1] = 0x00000000; |
|
lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS; |
|
lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS; |
|
|
|
outw(0x0001, ioaddr+LANCE_ADDR); |
|
inw(ioaddr+LANCE_ADDR); |
|
outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA); |
|
outw(0x0002, ioaddr+LANCE_ADDR); |
|
inw(ioaddr+LANCE_ADDR); |
|
outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA); |
|
outw(0x0000, ioaddr+LANCE_ADDR); |
|
inw(ioaddr+LANCE_ADDR); |
|
|
|
if (irq) { /* Set iff PCI card. */ |
|
dev->dma = 4; /* Native bus-master, no DMA channel needed. */ |
|
dev->irq = irq; |
|
} else if (hp_builtin) { |
|
static const char dma_tbl[4] = {3, 5, 6, 0}; |
|
static const char irq_tbl[4] = {3, 4, 5, 9}; |
|
unsigned char port_val = inb(hp_builtin); |
|
dev->dma = dma_tbl[(port_val >> 4) & 3]; |
|
dev->irq = irq_tbl[(port_val >> 2) & 3]; |
|
printk(" HP Vectra IRQ %d DMA %d.\n", dev->irq, dev->dma); |
|
} else if (hpJ2405A) { |
|
static const char dma_tbl[4] = {3, 5, 6, 7}; |
|
static const char irq_tbl[8] = {3, 4, 5, 9, 10, 11, 12, 15}; |
|
short reset_val = inw(ioaddr+LANCE_RESET); |
|
dev->dma = dma_tbl[(reset_val >> 2) & 3]; |
|
dev->irq = irq_tbl[(reset_val >> 4) & 7]; |
|
printk(" HP J2405A IRQ %d DMA %d.\n", dev->irq, dev->dma); |
|
} else if (lance_version == PCNET_ISAP) { /* The plug-n-play version. */ |
|
short bus_info; |
|
outw(8, ioaddr+LANCE_ADDR); |
|
bus_info = inw(ioaddr+LANCE_BUS_IF); |
|
dev->dma = bus_info & 0x07; |
|
dev->irq = (bus_info >> 4) & 0x0F; |
|
} else { |
|
/* The DMA channel may be passed in PARAM1. */ |
|
if (dev->mem_start & 0x07) |
|
dev->dma = dev->mem_start & 0x07; |
|
} |
|
|
|
if (dev->dma == 0) { |
|
/* Read the DMA channel status register, so that we can avoid |
|
stuck DMA channels in the DMA detection below. */ |
|
dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) | |
|
(inb(DMA2_STAT_REG) & 0xf0); |
|
} |
|
err = -ENODEV; |
|
if (dev->irq >= 2) |
|
printk(" assigned IRQ %d", dev->irq); |
|
else if (lance_version != 0) { /* 7990 boards need DMA detection first. */ |
|
unsigned long irq_mask; |
|
|
|
/* To auto-IRQ we enable the initialization-done and DMA error |
|
interrupts. For ISA boards we get a DMA error, but VLB and PCI |
|
boards will work. */ |
|
irq_mask = probe_irq_on(); |
|
|
|
/* Trigger an initialization just for the interrupt. */ |
|
outw(0x0041, ioaddr+LANCE_DATA); |
|
|
|
mdelay(20); |
|
dev->irq = probe_irq_off(irq_mask); |
|
if (dev->irq) |
|
printk(", probed IRQ %d", dev->irq); |
|
else { |
|
printk(", failed to detect IRQ line.\n"); |
|
goto out_tx; |
|
} |
|
|
|
/* Check for the initialization done bit, 0x0100, which means |
|
that we don't need a DMA channel. */ |
|
if (inw(ioaddr+LANCE_DATA) & 0x0100) |
|
dev->dma = 4; |
|
} |
|
|
|
if (dev->dma == 4) { |
|
printk(", no DMA needed.\n"); |
|
} else if (dev->dma) { |
|
if (request_dma(dev->dma, chipname)) { |
|
printk("DMA %d allocation failed.\n", dev->dma); |
|
goto out_tx; |
|
} else |
|
printk(", assigned DMA %d.\n", dev->dma); |
|
} else { /* OK, we have to auto-DMA. */ |
|
for (i = 0; i < 4; i++) { |
|
static const char dmas[] = { 5, 6, 7, 3 }; |
|
int dma = dmas[i]; |
|
int boguscnt; |
|
|
|
/* Don't enable a permanently busy DMA channel, or the machine |
|
will hang. */ |
|
if (test_bit(dma, &dma_channels)) |
|
continue; |
|
outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */ |
|
if (request_dma(dma, chipname)) |
|
continue; |
|
|
|
flags=claim_dma_lock(); |
|
set_dma_mode(dma, DMA_MODE_CASCADE); |
|
enable_dma(dma); |
|
release_dma_lock(flags); |
|
|
|
/* Trigger an initialization. */ |
|
outw(0x0001, ioaddr+LANCE_DATA); |
|
for (boguscnt = 100; boguscnt > 0; --boguscnt) |
|
if (inw(ioaddr+LANCE_DATA) & 0x0900) |
|
break; |
|
if (inw(ioaddr+LANCE_DATA) & 0x0100) { |
|
dev->dma = dma; |
|
printk(", DMA %d.\n", dev->dma); |
|
break; |
|
} else { |
|
flags=claim_dma_lock(); |
|
disable_dma(dma); |
|
release_dma_lock(flags); |
|
free_dma(dma); |
|
} |
|
} |
|
if (i == 4) { /* Failure: bail. */ |
|
printk("DMA detection failed.\n"); |
|
goto out_tx; |
|
} |
|
} |
|
|
|
if (lance_version == 0 && dev->irq == 0) { |
|
/* We may auto-IRQ now that we have a DMA channel. */ |
|
/* Trigger an initialization just for the interrupt. */ |
|
unsigned long irq_mask; |
|
|
|
irq_mask = probe_irq_on(); |
|
outw(0x0041, ioaddr+LANCE_DATA); |
|
|
|
mdelay(40); |
|
dev->irq = probe_irq_off(irq_mask); |
|
if (dev->irq == 0) { |
|
printk(" Failed to detect the 7990 IRQ line.\n"); |
|
goto out_dma; |
|
} |
|
printk(" Auto-IRQ detected IRQ%d.\n", dev->irq); |
|
} |
|
|
|
if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) { |
|
/* Turn on auto-select of media (10baseT or BNC) so that the user |
|
can watch the LEDs even if the board isn't opened. */ |
|
outw(0x0002, ioaddr+LANCE_ADDR); |
|
/* Don't touch 10base2 power bit. */ |
|
outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF); |
|
} |
|
|
|
if (lance_debug > 0 && did_version++ == 0) |
|
printk(version); |
|
|
|
/* The LANCE-specific entries in the device structure. */ |
|
dev->netdev_ops = &lance_netdev_ops; |
|
dev->watchdog_timeo = TX_TIMEOUT; |
|
|
|
err = register_netdev(dev); |
|
if (err) |
|
goto out_dma; |
|
return 0; |
|
out_dma: |
|
if (dev->dma != 4) |
|
free_dma(dev->dma); |
|
out_tx: |
|
kfree(lp->tx_bounce_buffs); |
|
out_rx: |
|
kfree((void*)lp->rx_buffs); |
|
out_lp: |
|
kfree(lp); |
|
return err; |
|
} |
|
|
|
|
|
static int |
|
lance_open(struct net_device *dev) |
|
{ |
|
struct lance_private *lp = dev->ml_priv; |
|
int ioaddr = dev->base_addr; |
|
int i; |
|
|
|
if (dev->irq == 0 || |
|
request_irq(dev->irq, lance_interrupt, 0, dev->name, dev)) { |
|
return -EAGAIN; |
|
} |
|
|
|
/* We used to allocate DMA here, but that was silly. |
|
DMA lines can't be shared! We now permanently allocate them. */ |
|
|
|
/* Reset the LANCE */ |
|
inw(ioaddr+LANCE_RESET); |
|
|
|
/* The DMA controller is used as a no-operation slave, "cascade mode". */ |
|
if (dev->dma != 4) { |
|
unsigned long flags=claim_dma_lock(); |
|
enable_dma(dev->dma); |
|
set_dma_mode(dev->dma, DMA_MODE_CASCADE); |
|
release_dma_lock(flags); |
|
} |
|
|
|
/* Un-Reset the LANCE, needed only for the NE2100. */ |
|
if (chip_table[lp->chip_version].flags & LANCE_MUST_UNRESET) |
|
outw(0, ioaddr+LANCE_RESET); |
|
|
|
if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) { |
|
/* This is 79C960-specific: Turn on auto-select of media (AUI, BNC). */ |
|
outw(0x0002, ioaddr+LANCE_ADDR); |
|
/* Only touch autoselect bit. */ |
|
outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF); |
|
} |
|
|
|
if (lance_debug > 1) |
|
printk("%s: lance_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n", |
|
dev->name, dev->irq, dev->dma, |
|
(u32) isa_virt_to_bus(lp->tx_ring), |
|
(u32) isa_virt_to_bus(lp->rx_ring), |
|
(u32) isa_virt_to_bus(&lp->init_block)); |
|
|
|
lance_init_ring(dev, GFP_KERNEL); |
|
/* Re-initialize the LANCE, and start it when done. */ |
|
outw(0x0001, ioaddr+LANCE_ADDR); |
|
outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA); |
|
outw(0x0002, ioaddr+LANCE_ADDR); |
|
outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA); |
|
|
|
outw(0x0004, ioaddr+LANCE_ADDR); |
|
outw(0x0915, ioaddr+LANCE_DATA); |
|
|
|
outw(0x0000, ioaddr+LANCE_ADDR); |
|
outw(0x0001, ioaddr+LANCE_DATA); |
|
|
|
netif_start_queue (dev); |
|
|
|
i = 0; |
|
while (i++ < 100) |
|
if (inw(ioaddr+LANCE_DATA) & 0x0100) |
|
break; |
|
/* |
|
* We used to clear the InitDone bit, 0x0100, here but Mark Stockton |
|
* reports that doing so triggers a bug in the '974. |
|
*/ |
|
outw(0x0042, ioaddr+LANCE_DATA); |
|
|
|
if (lance_debug > 2) |
|
printk("%s: LANCE open after %d ticks, init block %#x csr0 %4.4x.\n", |
|
dev->name, i, (u32) isa_virt_to_bus(&lp->init_block), inw(ioaddr+LANCE_DATA)); |
|
|
|
return 0; /* Always succeed */ |
|
} |
|
|
|
/* The LANCE has been halted for one reason or another (busmaster memory |
|
arbitration error, Tx FIFO underflow, driver stopped it to reconfigure, |
|
etc.). Modern LANCE variants always reload their ring-buffer |
|
configuration when restarted, so we must reinitialize our ring |
|
context before restarting. As part of this reinitialization, |
|
find all packets still on the Tx ring and pretend that they had been |
|
sent (in effect, drop the packets on the floor) - the higher-level |
|
protocols will time out and retransmit. It'd be better to shuffle |
|
these skbs to a temp list and then actually re-Tx them after |
|
restarting the chip, but I'm too lazy to do so right now. [email protected] |
|
*/ |
|
|
|
static void |
|
lance_purge_ring(struct net_device *dev) |
|
{ |
|
struct lance_private *lp = dev->ml_priv; |
|
int i; |
|
|
|
/* Free all the skbuffs in the Rx and Tx queues. */ |
|
for (i = 0; i < RX_RING_SIZE; i++) { |
|
struct sk_buff *skb = lp->rx_skbuff[i]; |
|
lp->rx_skbuff[i] = NULL; |
|
lp->rx_ring[i].base = 0; /* Not owned by LANCE chip. */ |
|
if (skb) |
|
dev_kfree_skb_any(skb); |
|
} |
|
for (i = 0; i < TX_RING_SIZE; i++) { |
|
if (lp->tx_skbuff[i]) { |
|
dev_kfree_skb_any(lp->tx_skbuff[i]); |
|
lp->tx_skbuff[i] = NULL; |
|
} |
|
} |
|
} |
|
|
|
|
|
/* Initialize the LANCE Rx and Tx rings. */ |
|
static void |
|
lance_init_ring(struct net_device *dev, gfp_t gfp) |
|
{ |
|
struct lance_private *lp = dev->ml_priv; |
|
int i; |
|
|
|
lp->cur_rx = lp->cur_tx = 0; |
|
lp->dirty_rx = lp->dirty_tx = 0; |
|
|
|
for (i = 0; i < RX_RING_SIZE; i++) { |
|
struct sk_buff *skb; |
|
void *rx_buff; |
|
|
|
skb = alloc_skb(PKT_BUF_SZ, GFP_DMA | gfp); |
|
lp->rx_skbuff[i] = skb; |
|
if (skb) |
|
rx_buff = skb->data; |
|
else |
|
rx_buff = kmalloc(PKT_BUF_SZ, GFP_DMA | gfp); |
|
if (rx_buff == NULL) |
|
lp->rx_ring[i].base = 0; |
|
else |
|
lp->rx_ring[i].base = (u32)isa_virt_to_bus(rx_buff) | 0x80000000; |
|
lp->rx_ring[i].buf_length = -PKT_BUF_SZ; |
|
} |
|
/* The Tx buffer address is filled in as needed, but we do need to clear |
|
the upper ownership bit. */ |
|
for (i = 0; i < TX_RING_SIZE; i++) { |
|
lp->tx_skbuff[i] = NULL; |
|
lp->tx_ring[i].base = 0; |
|
} |
|
|
|
lp->init_block.mode = 0x0000; |
|
for (i = 0; i < 6; i++) |
|
lp->init_block.phys_addr[i] = dev->dev_addr[i]; |
|
lp->init_block.filter[0] = 0x00000000; |
|
lp->init_block.filter[1] = 0x00000000; |
|
lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS; |
|
lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS; |
|
} |
|
|
|
static void |
|
lance_restart(struct net_device *dev, unsigned int csr0_bits, int must_reinit) |
|
{ |
|
struct lance_private *lp = dev->ml_priv; |
|
|
|
if (must_reinit || |
|
(chip_table[lp->chip_version].flags & LANCE_MUST_REINIT_RING)) { |
|
lance_purge_ring(dev); |
|
lance_init_ring(dev, GFP_ATOMIC); |
|
} |
|
outw(0x0000, dev->base_addr + LANCE_ADDR); |
|
outw(csr0_bits, dev->base_addr + LANCE_DATA); |
|
} |
|
|
|
|
|
static void lance_tx_timeout (struct net_device *dev, unsigned int txqueue) |
|
{ |
|
struct lance_private *lp = (struct lance_private *) dev->ml_priv; |
|
int ioaddr = dev->base_addr; |
|
|
|
outw (0, ioaddr + LANCE_ADDR); |
|
printk ("%s: transmit timed out, status %4.4x, resetting.\n", |
|
dev->name, inw (ioaddr + LANCE_DATA)); |
|
outw (0x0004, ioaddr + LANCE_DATA); |
|
dev->stats.tx_errors++; |
|
#ifndef final_version |
|
if (lance_debug > 3) { |
|
int i; |
|
printk (" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.", |
|
lp->dirty_tx, lp->cur_tx, netif_queue_stopped(dev) ? " (full)" : "", |
|
lp->cur_rx); |
|
for (i = 0; i < RX_RING_SIZE; i++) |
|
printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ", |
|
lp->rx_ring[i].base, -lp->rx_ring[i].buf_length, |
|
lp->rx_ring[i].msg_length); |
|
for (i = 0; i < TX_RING_SIZE; i++) |
|
printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ", |
|
lp->tx_ring[i].base, -lp->tx_ring[i].length, |
|
lp->tx_ring[i].misc); |
|
printk ("\n"); |
|
} |
|
#endif |
|
lance_restart (dev, 0x0043, 1); |
|
|
|
netif_trans_update(dev); /* prevent tx timeout */ |
|
netif_wake_queue (dev); |
|
} |
|
|
|
|
|
static netdev_tx_t lance_start_xmit(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct lance_private *lp = dev->ml_priv; |
|
int ioaddr = dev->base_addr; |
|
int entry; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&lp->devlock, flags); |
|
|
|
if (lance_debug > 3) { |
|
outw(0x0000, ioaddr+LANCE_ADDR); |
|
printk("%s: lance_start_xmit() called, csr0 %4.4x.\n", dev->name, |
|
inw(ioaddr+LANCE_DATA)); |
|
outw(0x0000, ioaddr+LANCE_DATA); |
|
} |
|
|
|
/* Fill in a Tx ring entry */ |
|
|
|
/* Mask to ring buffer boundary. */ |
|
entry = lp->cur_tx & TX_RING_MOD_MASK; |
|
|
|
/* Caution: the write order is important here, set the base address |
|
with the "ownership" bits last. */ |
|
|
|
/* The old LANCE chips doesn't automatically pad buffers to min. size. */ |
|
if (chip_table[lp->chip_version].flags & LANCE_MUST_PAD) { |
|
if (skb->len < ETH_ZLEN) { |
|
if (skb_padto(skb, ETH_ZLEN)) |
|
goto out; |
|
lp->tx_ring[entry].length = -ETH_ZLEN; |
|
} |
|
else |
|
lp->tx_ring[entry].length = -skb->len; |
|
} else |
|
lp->tx_ring[entry].length = -skb->len; |
|
|
|
lp->tx_ring[entry].misc = 0x0000; |
|
|
|
dev->stats.tx_bytes += skb->len; |
|
|
|
/* If any part of this buffer is >16M we must copy it to a low-memory |
|
buffer. */ |
|
if ((u32)isa_virt_to_bus(skb->data) + skb->len > 0x01000000) { |
|
if (lance_debug > 5) |
|
printk("%s: bouncing a high-memory packet (%#x).\n", |
|
dev->name, (u32)isa_virt_to_bus(skb->data)); |
|
skb_copy_from_linear_data(skb, &lp->tx_bounce_buffs[entry], skb->len); |
|
lp->tx_ring[entry].base = |
|
((u32)isa_virt_to_bus((lp->tx_bounce_buffs + entry)) & 0xffffff) | 0x83000000; |
|
dev_kfree_skb(skb); |
|
} else { |
|
lp->tx_skbuff[entry] = skb; |
|
lp->tx_ring[entry].base = ((u32)isa_virt_to_bus(skb->data) & 0xffffff) | 0x83000000; |
|
} |
|
lp->cur_tx++; |
|
|
|
/* Trigger an immediate send poll. */ |
|
outw(0x0000, ioaddr+LANCE_ADDR); |
|
outw(0x0048, ioaddr+LANCE_DATA); |
|
|
|
if ((lp->cur_tx - lp->dirty_tx) >= TX_RING_SIZE) |
|
netif_stop_queue(dev); |
|
|
|
out: |
|
spin_unlock_irqrestore(&lp->devlock, flags); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
/* The LANCE interrupt handler. */ |
|
static irqreturn_t lance_interrupt(int irq, void *dev_id) |
|
{ |
|
struct net_device *dev = dev_id; |
|
struct lance_private *lp; |
|
int csr0, ioaddr, boguscnt=10; |
|
int must_restart; |
|
|
|
ioaddr = dev->base_addr; |
|
lp = dev->ml_priv; |
|
|
|
spin_lock (&lp->devlock); |
|
|
|
outw(0x00, dev->base_addr + LANCE_ADDR); |
|
while ((csr0 = inw(dev->base_addr + LANCE_DATA)) & 0x8600 && |
|
--boguscnt >= 0) { |
|
/* Acknowledge all of the current interrupt sources ASAP. */ |
|
outw(csr0 & ~0x004f, dev->base_addr + LANCE_DATA); |
|
|
|
must_restart = 0; |
|
|
|
if (lance_debug > 5) |
|
printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n", |
|
dev->name, csr0, inw(dev->base_addr + LANCE_DATA)); |
|
|
|
if (csr0 & 0x0400) /* Rx interrupt */ |
|
lance_rx(dev); |
|
|
|
if (csr0 & 0x0200) { /* Tx-done interrupt */ |
|
int dirty_tx = lp->dirty_tx; |
|
|
|
while (dirty_tx < lp->cur_tx) { |
|
int entry = dirty_tx & TX_RING_MOD_MASK; |
|
int status = lp->tx_ring[entry].base; |
|
|
|
if (status < 0) |
|
break; /* It still hasn't been Txed */ |
|
|
|
lp->tx_ring[entry].base = 0; |
|
|
|
if (status & 0x40000000) { |
|
/* There was an major error, log it. */ |
|
int err_status = lp->tx_ring[entry].misc; |
|
dev->stats.tx_errors++; |
|
if (err_status & 0x0400) |
|
dev->stats.tx_aborted_errors++; |
|
if (err_status & 0x0800) |
|
dev->stats.tx_carrier_errors++; |
|
if (err_status & 0x1000) |
|
dev->stats.tx_window_errors++; |
|
if (err_status & 0x4000) { |
|
/* Ackk! On FIFO errors the Tx unit is turned off! */ |
|
dev->stats.tx_fifo_errors++; |
|
/* Remove this verbosity later! */ |
|
printk("%s: Tx FIFO error! Status %4.4x.\n", |
|
dev->name, csr0); |
|
/* Restart the chip. */ |
|
must_restart = 1; |
|
} |
|
} else { |
|
if (status & 0x18000000) |
|
dev->stats.collisions++; |
|
dev->stats.tx_packets++; |
|
} |
|
|
|
/* We must free the original skb if it's not a data-only copy |
|
in the bounce buffer. */ |
|
if (lp->tx_skbuff[entry]) { |
|
dev_consume_skb_irq(lp->tx_skbuff[entry]); |
|
lp->tx_skbuff[entry] = NULL; |
|
} |
|
dirty_tx++; |
|
} |
|
|
|
#ifndef final_version |
|
if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) { |
|
printk("out-of-sync dirty pointer, %d vs. %d, full=%s.\n", |
|
dirty_tx, lp->cur_tx, |
|
netif_queue_stopped(dev) ? "yes" : "no"); |
|
dirty_tx += TX_RING_SIZE; |
|
} |
|
#endif |
|
|
|
/* if the ring is no longer full, accept more packets */ |
|
if (netif_queue_stopped(dev) && |
|
dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) |
|
netif_wake_queue (dev); |
|
|
|
lp->dirty_tx = dirty_tx; |
|
} |
|
|
|
/* Log misc errors. */ |
|
if (csr0 & 0x4000) |
|
dev->stats.tx_errors++; /* Tx babble. */ |
|
if (csr0 & 0x1000) |
|
dev->stats.rx_errors++; /* Missed a Rx frame. */ |
|
if (csr0 & 0x0800) { |
|
printk("%s: Bus master arbitration failure, status %4.4x.\n", |
|
dev->name, csr0); |
|
/* Restart the chip. */ |
|
must_restart = 1; |
|
} |
|
|
|
if (must_restart) { |
|
/* stop the chip to clear the error condition, then restart */ |
|
outw(0x0000, dev->base_addr + LANCE_ADDR); |
|
outw(0x0004, dev->base_addr + LANCE_DATA); |
|
lance_restart(dev, 0x0002, 0); |
|
} |
|
} |
|
|
|
/* Clear any other interrupt, and set interrupt enable. */ |
|
outw(0x0000, dev->base_addr + LANCE_ADDR); |
|
outw(0x7940, dev->base_addr + LANCE_DATA); |
|
|
|
if (lance_debug > 4) |
|
printk("%s: exiting interrupt, csr%d=%#4.4x.\n", |
|
dev->name, inw(ioaddr + LANCE_ADDR), |
|
inw(dev->base_addr + LANCE_DATA)); |
|
|
|
spin_unlock (&lp->devlock); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int |
|
lance_rx(struct net_device *dev) |
|
{ |
|
struct lance_private *lp = dev->ml_priv; |
|
int entry = lp->cur_rx & RX_RING_MOD_MASK; |
|
int i; |
|
|
|
/* If we own the next entry, it's a new packet. Send it up. */ |
|
while (lp->rx_ring[entry].base >= 0) { |
|
int status = lp->rx_ring[entry].base >> 24; |
|
|
|
if (status != 0x03) { /* There was an error. */ |
|
/* There is a tricky error noted by John Murphy, |
|
<[email protected]> to Russ Nelson: Even with full-sized |
|
buffers it's possible for a jabber packet to use two |
|
buffers, with only the last correctly noting the error. */ |
|
if (status & 0x01) /* Only count a general error at the */ |
|
dev->stats.rx_errors++; /* end of a packet.*/ |
|
if (status & 0x20) |
|
dev->stats.rx_frame_errors++; |
|
if (status & 0x10) |
|
dev->stats.rx_over_errors++; |
|
if (status & 0x08) |
|
dev->stats.rx_crc_errors++; |
|
if (status & 0x04) |
|
dev->stats.rx_fifo_errors++; |
|
lp->rx_ring[entry].base &= 0x03ffffff; |
|
} |
|
else |
|
{ |
|
/* Malloc up new buffer, compatible with net3. */ |
|
short pkt_len = (lp->rx_ring[entry].msg_length & 0xfff)-4; |
|
struct sk_buff *skb; |
|
|
|
if(pkt_len<60) |
|
{ |
|
printk("%s: Runt packet!\n",dev->name); |
|
dev->stats.rx_errors++; |
|
} |
|
else |
|
{ |
|
skb = dev_alloc_skb(pkt_len+2); |
|
if (skb == NULL) |
|
{ |
|
printk("%s: Memory squeeze, deferring packet.\n", dev->name); |
|
for (i=0; i < RX_RING_SIZE; i++) |
|
if (lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].base < 0) |
|
break; |
|
|
|
if (i > RX_RING_SIZE -2) |
|
{ |
|
dev->stats.rx_dropped++; |
|
lp->rx_ring[entry].base |= 0x80000000; |
|
lp->cur_rx++; |
|
} |
|
break; |
|
} |
|
skb_reserve(skb,2); /* 16 byte align */ |
|
skb_put(skb,pkt_len); /* Make room */ |
|
skb_copy_to_linear_data(skb, |
|
(unsigned char *)isa_bus_to_virt((lp->rx_ring[entry].base & 0x00ffffff)), |
|
pkt_len); |
|
skb->protocol=eth_type_trans(skb,dev); |
|
netif_rx(skb); |
|
dev->stats.rx_packets++; |
|
dev->stats.rx_bytes += pkt_len; |
|
} |
|
} |
|
/* The docs say that the buffer length isn't touched, but Andrew Boyd |
|
of QNX reports that some revs of the 79C965 clear it. */ |
|
lp->rx_ring[entry].buf_length = -PKT_BUF_SZ; |
|
lp->rx_ring[entry].base |= 0x80000000; |
|
entry = (++lp->cur_rx) & RX_RING_MOD_MASK; |
|
} |
|
|
|
/* We should check that at least two ring entries are free. If not, |
|
we should free one and mark stats->rx_dropped++. */ |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
lance_close(struct net_device *dev) |
|
{ |
|
int ioaddr = dev->base_addr; |
|
struct lance_private *lp = dev->ml_priv; |
|
|
|
netif_stop_queue (dev); |
|
|
|
if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) { |
|
outw(112, ioaddr+LANCE_ADDR); |
|
dev->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA); |
|
} |
|
outw(0, ioaddr+LANCE_ADDR); |
|
|
|
if (lance_debug > 1) |
|
printk("%s: Shutting down ethercard, status was %2.2x.\n", |
|
dev->name, inw(ioaddr+LANCE_DATA)); |
|
|
|
/* We stop the LANCE here -- it occasionally polls |
|
memory if we don't. */ |
|
outw(0x0004, ioaddr+LANCE_DATA); |
|
|
|
if (dev->dma != 4) |
|
{ |
|
unsigned long flags=claim_dma_lock(); |
|
disable_dma(dev->dma); |
|
release_dma_lock(flags); |
|
} |
|
free_irq(dev->irq, dev); |
|
|
|
lance_purge_ring(dev); |
|
|
|
return 0; |
|
} |
|
|
|
static struct net_device_stats *lance_get_stats(struct net_device *dev) |
|
{ |
|
struct lance_private *lp = dev->ml_priv; |
|
|
|
if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) { |
|
short ioaddr = dev->base_addr; |
|
short saved_addr; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&lp->devlock, flags); |
|
saved_addr = inw(ioaddr+LANCE_ADDR); |
|
outw(112, ioaddr+LANCE_ADDR); |
|
dev->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA); |
|
outw(saved_addr, ioaddr+LANCE_ADDR); |
|
spin_unlock_irqrestore(&lp->devlock, flags); |
|
} |
|
|
|
return &dev->stats; |
|
} |
|
|
|
/* Set or clear the multicast filter for this adaptor. |
|
*/ |
|
|
|
static void set_multicast_list(struct net_device *dev) |
|
{ |
|
short ioaddr = dev->base_addr; |
|
|
|
outw(0, ioaddr+LANCE_ADDR); |
|
outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance. */ |
|
|
|
if (dev->flags&IFF_PROMISC) { |
|
outw(15, ioaddr+LANCE_ADDR); |
|
outw(0x8000, ioaddr+LANCE_DATA); /* Set promiscuous mode */ |
|
} else { |
|
short multicast_table[4]; |
|
int i; |
|
int num_addrs=netdev_mc_count(dev); |
|
if(dev->flags&IFF_ALLMULTI) |
|
num_addrs=1; |
|
/* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */ |
|
memset(multicast_table, (num_addrs == 0) ? 0 : -1, sizeof(multicast_table)); |
|
for (i = 0; i < 4; i++) { |
|
outw(8 + i, ioaddr+LANCE_ADDR); |
|
outw(multicast_table[i], ioaddr+LANCE_DATA); |
|
} |
|
outw(15, ioaddr+LANCE_ADDR); |
|
outw(0x0000, ioaddr+LANCE_DATA); /* Unset promiscuous mode */ |
|
} |
|
|
|
lance_restart(dev, 0x0142, 0); /* Resume normal operation */ |
|
|
|
} |
|
|
|
|