1 /* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */
3 Written 1994 by Donald Becker.
5 This driver is for the Hewlett Packard PC LAN (27***) plus ethercards.
6 These cards are sold under several model numbers, usually 2724*.
8 This software may be used and distributed according to the terms
9 of the GNU General Public License, incorporated herein by reference.
11 The author may be reached as becker@scyld.com, or C/O
12 Scyld Computing Corporation
13 410 Severn Ave., Suite 210
16 As is often the case, a great deal of credit is owed to Russ Nelson.
17 The Crynwr packet driver was my primary source of HP-specific
18 programming information.
21 static const char version
[] =
22 "hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
24 #include <linux/module.h>
26 #include <linux/string.h> /* Important -- this inlines word moves. */
27 #include <linux/kernel.h>
28 #include <linux/errno.h>
29 #include <linux/ioport.h>
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/init.h>
33 #include <linux/interrupt.h>
34 #include <linux/delay.h>
36 #include <asm/system.h>
41 #define DRV_NAME "hp-plus"
43 /* A zero-terminated list of I/O addresses to be probed. */
44 static unsigned int hpplus_portlist
[] __initdata
=
45 {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
48 The HP EtherTwist chip implementation is a fairly routine DP8390
49 implementation. It allows both shared memory and programmed-I/O buffer
50 access, using a custom interface for both. The programmed-I/O mode is
51 entirely implemented in the HP EtherTwist chip, bypassing the problem
52 ridden built-in 8390 facilities used on NE2000 designs. The shared
53 memory mode is likewise special, with an offset register used to make
54 packets appear at the shared memory base. Both modes use a base and bounds
55 page register to hide the Rx ring buffer wrap -- a packet that spans the
56 end of physical buffer memory appears continuous to the driver. (c.f. the
57 3c503 and Cabletron E2100)
59 A special note: the internal buffer of the board is only 8 bits wide.
60 This lays several nasty traps for the unaware:
61 - the 8390 must be programmed for byte-wide operations
62 - all I/O and memory operations must work on whole words (the access
63 latches are serially preloaded and have no byte-swapping ability).
65 This board is laid out in I/O space much like the earlier HP boards:
66 the first 16 locations are for the board registers, and the second 16 are
67 for the 8390. The board is easy to identify, with both a dedicated 16 bit
68 ID register and a constant 0x530* value in the upper bits of the paging
72 #define HP_ID 0x00 /* ID register, always 0x4850. */
73 #define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */
74 #define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */
75 #define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */
76 #define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */
77 #define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */
78 #define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */
79 #define HP_IO_EXTENT 32
81 #define HP_START_PG 0x00 /* First page of TX buffer */
82 #define HP_STOP_PG 0x80 /* Last page +1 of RX ring */
84 /* The register set selected in HP_PAGING. */
86 Perf_Page
= 0, /* Normal operation. */
87 MAC_Page
= 1, /* The ethernet address (+checksum). */
88 HW_Page
= 2, /* EEPROM-loaded hardware parameters. */
89 LAN_Page
= 4, /* Transceiver selection, testing, etc. */
92 /* The bit definitions for the HPP_OPTION register. */
94 NICReset
= 1, ChipReset
= 2, /* Active low, really UNreset. */
95 EnableIRQ
= 4, FakeIntr
= 8, BootROMEnb
= 0x10, IOEnb
= 0x20,
96 MemEnable
= 0x40, ZeroWait
= 0x80, MemDisable
= 0x1000, };
98 static int hpp_probe1(struct net_device
*dev
, int ioaddr
);
100 static void hpp_reset_8390(struct net_device
*dev
);
101 static int hpp_open(struct net_device
*dev
);
102 static int hpp_close(struct net_device
*dev
);
103 static void hpp_mem_block_input(struct net_device
*dev
, int count
,
104 struct sk_buff
*skb
, int ring_offset
);
105 static void hpp_mem_block_output(struct net_device
*dev
, int count
,
106 const unsigned char *buf
, int start_page
);
107 static void hpp_mem_get_8390_hdr(struct net_device
*dev
, struct e8390_pkt_hdr
*hdr
,
109 static void hpp_io_block_input(struct net_device
*dev
, int count
,
110 struct sk_buff
*skb
, int ring_offset
);
111 static void hpp_io_block_output(struct net_device
*dev
, int count
,
112 const unsigned char *buf
, int start_page
);
113 static void hpp_io_get_8390_hdr(struct net_device
*dev
, struct e8390_pkt_hdr
*hdr
,
117 /* Probe a list of addresses for an HP LAN+ adaptor.
118 This routine is almost boilerplate. */
120 static int __init
do_hpp_probe(struct net_device
*dev
)
123 int base_addr
= dev
->base_addr
;
126 if (base_addr
> 0x1ff) /* Check a single specified location. */
127 return hpp_probe1(dev
, base_addr
);
128 else if (base_addr
!= 0) /* Don't probe at all. */
131 for (i
= 0; hpplus_portlist
[i
]; i
++) {
132 if (hpp_probe1(dev
, hpplus_portlist
[i
]) == 0)
141 struct net_device
* __init
hp_plus_probe(int unit
)
143 struct net_device
*dev
= alloc_eip_netdev();
147 return ERR_PTR(-ENOMEM
);
149 sprintf(dev
->name
, "eth%d", unit
);
150 netdev_boot_setup_check(dev
);
152 err
= do_hpp_probe(dev
);
162 static const struct net_device_ops hpp_netdev_ops
= {
163 .ndo_open
= hpp_open
,
164 .ndo_stop
= hpp_close
,
165 .ndo_start_xmit
= eip_start_xmit
,
166 .ndo_tx_timeout
= eip_tx_timeout
,
167 .ndo_get_stats
= eip_get_stats
,
168 .ndo_set_rx_mode
= eip_set_multicast_list
,
169 .ndo_validate_addr
= eth_validate_addr
,
170 .ndo_set_mac_address
= eth_mac_addr
,
171 .ndo_change_mtu
= eth_change_mtu
,
172 #ifdef CONFIG_NET_POLL_CONTROLLER
173 .ndo_poll_controller
= eip_poll
,
178 /* Do the interesting part of the probe at a single address. */
179 static int __init
hpp_probe1(struct net_device
*dev
, int ioaddr
)
182 unsigned char checksum
= 0;
183 const char name
[] = "HP-PC-LAN+";
185 static unsigned version_printed
;
187 if (!request_region(ioaddr
, HP_IO_EXTENT
, DRV_NAME
))
190 /* Check for the HP+ signature, 50 48 0x 53. */
191 if (inw(ioaddr
+ HP_ID
) != 0x4850 ||
192 (inw(ioaddr
+ HP_PAGING
) & 0xfff0) != 0x5300) {
197 if (ei_debug
&& version_printed
++ == 0)
200 printk("%s: %s at %#3x, ", dev
->name
, name
, ioaddr
);
202 /* Retrieve and checksum the station address. */
203 outw(MAC_Page
, ioaddr
+ HP_PAGING
);
205 for(i
= 0; i
< ETHER_ADDR_LEN
; i
++) {
206 unsigned char inval
= inb(ioaddr
+ 8 + i
);
207 dev
->dev_addr
[i
] = inval
;
210 checksum
+= inb(ioaddr
+ 14);
212 printk("%pM", dev
->dev_addr
);
214 if (checksum
!= 0xff) {
215 printk(" bad checksum %2.2x.\n", checksum
);
219 /* Point at the Software Configuration Flags. */
220 outw(ID_Page
, ioaddr
+ HP_PAGING
);
221 printk(" ID %4.4x", inw(ioaddr
+ 12));
224 /* Read the IRQ line. */
225 outw(HW_Page
, ioaddr
+ HP_PAGING
);
227 int irq
= inb(ioaddr
+ 13) & 0x0f;
228 int option
= inw(ioaddr
+ HPP_OPTION
);
231 if (option
& MemEnable
) {
232 mem_start
= inw(ioaddr
+ 9) << 8;
233 printk(", IRQ %d, memory address %#x.\n", irq
, mem_start
);
236 printk(", IRQ %d, programmed-I/O mode.\n", irq
);
240 /* Set the wrap registers for string I/O reads. */
241 outw((HP_START_PG
+ TX_PAGES
/2) | ((HP_STOP_PG
- 1) << 8), ioaddr
+ 14);
243 /* Set the base address to point to the NIC, not the "real" base! */
244 dev
->base_addr
= ioaddr
+ NIC_OFFSET
;
246 dev
->netdev_ops
= &hpp_netdev_ops
;
248 ei_status
.name
= name
;
249 ei_status
.word16
= 0; /* Agggghhhhh! Debug time: 2 days! */
250 ei_status
.tx_start_page
= HP_START_PG
;
251 ei_status
.rx_start_page
= HP_START_PG
+ TX_PAGES
/2;
252 ei_status
.stop_page
= HP_STOP_PG
;
254 ei_status
.reset_8390
= &hpp_reset_8390
;
255 ei_status
.block_input
= &hpp_io_block_input
;
256 ei_status
.block_output
= &hpp_io_block_output
;
257 ei_status
.get_8390_hdr
= &hpp_io_get_8390_hdr
;
259 /* Check if the memory_enable flag is set in the option register. */
261 ei_status
.block_input
= &hpp_mem_block_input
;
262 ei_status
.block_output
= &hpp_mem_block_output
;
263 ei_status
.get_8390_hdr
= &hpp_mem_get_8390_hdr
;
264 dev
->mem_start
= mem_start
;
265 ei_status
.mem
= ioremap(mem_start
,
266 (HP_STOP_PG
- HP_START_PG
)*256);
267 if (!ei_status
.mem
) {
271 ei_status
.rmem_start
= dev
->mem_start
+ TX_PAGES
/2*256;
272 dev
->mem_end
= ei_status
.rmem_end
273 = dev
->mem_start
+ (HP_STOP_PG
- HP_START_PG
)*256;
276 outw(Perf_Page
, ioaddr
+ HP_PAGING
);
277 NS8390p_init(dev
, 0);
278 /* Leave the 8390 and HP chip reset. */
279 outw(inw(ioaddr
+ HPP_OPTION
) & ~EnableIRQ
, ioaddr
+ HPP_OPTION
);
281 retval
= register_netdev(dev
);
286 iounmap(ei_status
.mem
);
288 release_region(ioaddr
, HP_IO_EXTENT
);
293 hpp_open(struct net_device
*dev
)
295 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
299 if ((retval
= request_irq(dev
->irq
, eip_interrupt
, 0, dev
->name
, dev
))) {
303 /* Reset the 8390 and HP chip. */
304 option_reg
= inw(ioaddr
+ HPP_OPTION
);
305 outw(option_reg
& ~(NICReset
+ ChipReset
), ioaddr
+ HPP_OPTION
);
307 /* Unreset the board and enable interrupts. */
308 outw(option_reg
| (EnableIRQ
+ NICReset
+ ChipReset
), ioaddr
+ HPP_OPTION
);
310 /* Set the wrap registers for programmed-I/O operation. */
311 outw(HW_Page
, ioaddr
+ HP_PAGING
);
312 outw((HP_START_PG
+ TX_PAGES
/2) | ((HP_STOP_PG
- 1) << 8), ioaddr
+ 14);
314 /* Select the operational page. */
315 outw(Perf_Page
, ioaddr
+ HP_PAGING
);
317 return eip_open(dev
);
321 hpp_close(struct net_device
*dev
)
323 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
324 int option_reg
= inw(ioaddr
+ HPP_OPTION
);
326 free_irq(dev
->irq
, dev
);
328 outw((option_reg
& ~EnableIRQ
) | MemDisable
| NICReset
| ChipReset
,
329 ioaddr
+ HPP_OPTION
);
335 hpp_reset_8390(struct net_device
*dev
)
337 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
338 int option_reg
= inw(ioaddr
+ HPP_OPTION
);
340 if (ei_debug
> 1) printk("resetting the 8390 time=%ld...", jiffies
);
342 outw(option_reg
& ~(NICReset
+ ChipReset
), ioaddr
+ HPP_OPTION
);
343 /* Pause a few cycles for the hardware reset to take place. */
346 outw(option_reg
| (EnableIRQ
+ NICReset
+ ChipReset
), ioaddr
+ HPP_OPTION
);
351 if ((inb_p(ioaddr
+NIC_OFFSET
+EN0_ISR
) & ENISR_RESET
) == 0)
352 printk("%s: hp_reset_8390() did not complete.\n", dev
->name
);
354 if (ei_debug
> 1) printk("8390 reset done (%ld).", jiffies
);
357 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
358 Note that transfer with the EtherTwist+ must be on word boundaries. */
361 hpp_io_get_8390_hdr(struct net_device
*dev
, struct e8390_pkt_hdr
*hdr
, int ring_page
)
363 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
365 outw((ring_page
<<8), ioaddr
+ HPP_IN_ADDR
);
366 insw(ioaddr
+ HP_DATAPORT
, hdr
, sizeof(struct e8390_pkt_hdr
)>>1);
369 /* Block input and output, similar to the Crynwr packet driver. */
372 hpp_io_block_input(struct net_device
*dev
, int count
, struct sk_buff
*skb
, int ring_offset
)
374 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
375 char *buf
= skb
->data
;
377 outw(ring_offset
, ioaddr
+ HPP_IN_ADDR
);
378 insw(ioaddr
+ HP_DATAPORT
, buf
, count
>>1);
380 buf
[count
-1] = inw(ioaddr
+ HP_DATAPORT
);
383 /* The corresponding shared memory versions of the above 2 functions. */
386 hpp_mem_get_8390_hdr(struct net_device
*dev
, struct e8390_pkt_hdr
*hdr
, int ring_page
)
388 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
389 int option_reg
= inw(ioaddr
+ HPP_OPTION
);
391 outw((ring_page
<<8), ioaddr
+ HPP_IN_ADDR
);
392 outw(option_reg
& ~(MemDisable
+ BootROMEnb
), ioaddr
+ HPP_OPTION
);
393 memcpy_fromio(hdr
, ei_status
.mem
, sizeof(struct e8390_pkt_hdr
));
394 outw(option_reg
, ioaddr
+ HPP_OPTION
);
395 hdr
->count
= (le16_to_cpu(hdr
->count
) + 3) & ~3; /* Round up allocation. */
399 hpp_mem_block_input(struct net_device
*dev
, int count
, struct sk_buff
*skb
, int ring_offset
)
401 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
402 int option_reg
= inw(ioaddr
+ HPP_OPTION
);
404 outw(ring_offset
, ioaddr
+ HPP_IN_ADDR
);
406 outw(option_reg
& ~(MemDisable
+ BootROMEnb
), ioaddr
+ HPP_OPTION
);
408 /* Caution: this relies on get_8390_hdr() rounding up count!
409 Also note that we *can't* use eth_io_copy_and_sum() because
410 it will not always copy "count" bytes (e.g. padded IP). */
412 memcpy_fromio(skb
->data
, ei_status
.mem
, count
);
413 outw(option_reg
, ioaddr
+ HPP_OPTION
);
416 /* A special note: we *must* always transfer >=16 bit words.
417 It's always safe to round up, so we do. */
419 hpp_io_block_output(struct net_device
*dev
, int count
,
420 const unsigned char *buf
, int start_page
)
422 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
423 outw(start_page
<< 8, ioaddr
+ HPP_OUT_ADDR
);
424 outsl(ioaddr
+ HP_DATAPORT
, buf
, (count
+3)>>2);
428 hpp_mem_block_output(struct net_device
*dev
, int count
,
429 const unsigned char *buf
, int start_page
)
431 int ioaddr
= dev
->base_addr
- NIC_OFFSET
;
432 int option_reg
= inw(ioaddr
+ HPP_OPTION
);
434 outw(start_page
<< 8, ioaddr
+ HPP_OUT_ADDR
);
435 outw(option_reg
& ~(MemDisable
+ BootROMEnb
), ioaddr
+ HPP_OPTION
);
436 memcpy_toio(ei_status
.mem
, buf
, (count
+ 3) & ~3);
437 outw(option_reg
, ioaddr
+ HPP_OPTION
);
442 #define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
443 static struct net_device
*dev_hpp
[MAX_HPP_CARDS
];
444 static int io
[MAX_HPP_CARDS
];
445 static int irq
[MAX_HPP_CARDS
];
447 module_param_array(io
, int, NULL
, 0);
448 module_param_array(irq
, int, NULL
, 0);
449 MODULE_PARM_DESC(io
, "I/O port address(es)");
450 MODULE_PARM_DESC(irq
, "IRQ number(s); ignored if properly detected");
451 MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
452 MODULE_LICENSE("GPL");
454 /* This is set up so that only a single autoprobe takes place per call.
455 ISA device autoprobes on a running machine are not recommended. */
459 struct net_device
*dev
;
460 int this_dev
, found
= 0;
462 for (this_dev
= 0; this_dev
< MAX_HPP_CARDS
; this_dev
++) {
463 if (io
[this_dev
] == 0) {
464 if (this_dev
!= 0) break; /* only autoprobe 1st one */
465 printk(KERN_NOTICE
"hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
467 dev
= alloc_eip_netdev();
470 dev
->irq
= irq
[this_dev
];
471 dev
->base_addr
= io
[this_dev
];
472 if (do_hpp_probe(dev
) == 0) {
473 dev_hpp
[found
++] = dev
;
477 printk(KERN_WARNING
"hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io
[this_dev
]);
485 static void cleanup_card(struct net_device
*dev
)
487 /* NB: hpp_close() handles free_irq */
488 iounmap(ei_status
.mem
);
489 release_region(dev
->base_addr
- NIC_OFFSET
, HP_IO_EXTENT
);
497 for (this_dev
= 0; this_dev
< MAX_HPP_CARDS
; this_dev
++) {
498 struct net_device
*dev
= dev_hpp
[this_dev
];
500 unregister_netdev(dev
);