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/delay.h>
35 #include <asm/system.h>
40 /* A zero-terminated list of I/O addresses to be probed. */
41 static unsigned int hpplus_portlist[] __initdata =
42 {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
45 The HP EtherTwist chip implementation is a fairly routine DP8390
46 implementation. It allows both shared memory and programmed-I/O buffer
47 access, using a custom interface for both. The programmed-I/O mode is
48 entirely implemented in the HP EtherTwist chip, bypassing the problem
49 ridden built-in 8390 facilities used on NE2000 designs. The shared
50 memory mode is likewise special, with an offset register used to make
51 packets appear at the shared memory base. Both modes use a base and bounds
52 page register to hide the Rx ring buffer wrap -- a packet that spans the
53 end of physical buffer memory appears continuous to the driver. (c.f. the
54 3c503 and Cabletron E2100)
56 A special note: the internal buffer of the board is only 8 bits wide.
57 This lays several nasty traps for the unaware:
58 - the 8390 must be programmed for byte-wide operations
59 - all I/O and memory operations must work on whole words (the access
60 latches are serially preloaded and have no byte-swapping ability).
62 This board is laid out in I/O space much like the earlier HP boards:
63 the first 16 locations are for the board registers, and the second 16 are
64 for the 8390. The board is easy to identify, with both a dedicated 16 bit
65 ID register and a constant 0x530* value in the upper bits of the paging
69 #define HP_ID 0x00 /* ID register, always 0x4850. */
70 #define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */
71 #define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */
72 #define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */
73 #define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */
74 #define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */
75 #define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */
76 #define HP_IO_EXTENT 32
78 #define HP_START_PG 0x00 /* First page of TX buffer */
79 #define HP_STOP_PG 0x80 /* Last page +1 of RX ring */
81 /* The register set selected in HP_PAGING. */
83 Perf_Page = 0, /* Normal operation. */
84 MAC_Page = 1, /* The ethernet address (+checksum). */
85 HW_Page = 2, /* EEPROM-loaded hardware parameters. */
86 LAN_Page = 4, /* Transceiver selection, testing, etc. */
89 /* The bit definitions for the HPP_OPTION register. */
91 NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */
92 EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
93 MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };
95 static int hpp_probe1(struct net_device *dev, int ioaddr);
97 static void hpp_reset_8390(struct net_device *dev);
98 static int hpp_open(struct net_device *dev);
99 static int hpp_close(struct net_device *dev);
100 static void hpp_mem_block_input(struct net_device *dev, int count,
101 struct sk_buff *skb, int ring_offset);
102 static void hpp_mem_block_output(struct net_device *dev, int count,
103 const unsigned char *buf, int start_page);
104 static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
106 static void hpp_io_block_input(struct net_device *dev, int count,
107 struct sk_buff *skb, int ring_offset);
108 static void hpp_io_block_output(struct net_device *dev, int count,
109 const unsigned char *buf, int start_page);
110 static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
114 /* Probe a list of addresses for an HP LAN+ adaptor.
115 This routine is almost boilerplate. */
117 static int __init do_hpp_probe(struct net_device *dev)
120 int base_addr = dev->base_addr;
123 SET_MODULE_OWNER(dev);
125 if (base_addr > 0x1ff) /* Check a single specified location. */
126 return hpp_probe1(dev, base_addr);
127 else if (base_addr != 0) /* Don't probe at all. */
130 for (i = 0; hpplus_portlist[i]; i++) {
131 if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
139 static void cleanup_card(struct net_device *dev)
141 /* NB: hpp_close() handles free_irq */
142 release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
145 struct net_device * __init hp_plus_probe(int unit)
147 struct net_device *dev = alloc_ei_netdev();
151 return ERR_PTR(-ENOMEM);
153 sprintf(dev->name, "eth%d", unit);
154 netdev_boot_setup_check(dev);
156 err = do_hpp_probe(dev);
159 err = register_netdev(dev);
170 /* Do the interesting part of the probe at a single address. */
171 static int __init hpp_probe1(struct net_device *dev, int ioaddr)
174 unsigned char checksum = 0;
175 const char name[] = "HP-PC-LAN+";
177 static unsigned version_printed;
179 if (!request_region(ioaddr, HP_IO_EXTENT, dev->name))
182 /* Check for the HP+ signature, 50 48 0x 53. */
183 if (inw(ioaddr + HP_ID) != 0x4850
184 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
189 if (ei_debug && version_printed++ == 0)
192 printk("%s: %s at %#3x,", dev->name, name, ioaddr);
194 /* Retrieve and checksum the station address. */
195 outw(MAC_Page, ioaddr + HP_PAGING);
197 for(i = 0; i < ETHER_ADDR_LEN; i++) {
198 unsigned char inval = inb(ioaddr + 8 + i);
199 dev->dev_addr[i] = inval;
201 printk(" %2.2x", inval);
203 checksum += inb(ioaddr + 14);
205 if (checksum != 0xff) {
206 printk(" bad checksum %2.2x.\n", checksum);
210 /* Point at the Software Configuration Flags. */
211 outw(ID_Page, ioaddr + HP_PAGING);
212 printk(" ID %4.4x", inw(ioaddr + 12));
215 /* Read the IRQ line. */
216 outw(HW_Page, ioaddr + HP_PAGING);
218 int irq = inb(ioaddr + 13) & 0x0f;
219 int option = inw(ioaddr + HPP_OPTION);
222 if (option & MemEnable) {
223 mem_start = inw(ioaddr + 9) << 8;
224 printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
227 printk(", IRQ %d, programmed-I/O mode.\n", irq);
231 /* Set the wrap registers for string I/O reads. */
232 outw((HP_START_PG + TX_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
234 /* Set the base address to point to the NIC, not the "real" base! */
235 dev->base_addr = ioaddr + NIC_OFFSET;
237 dev->open = &hpp_open;
238 dev->stop = &hpp_close;
239 #ifdef CONFIG_NET_POLL_CONTROLLER
240 dev->poll_controller = ei_poll;
243 ei_status.name = name;
244 ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */
245 ei_status.tx_start_page = HP_START_PG;
246 ei_status.rx_start_page = HP_START_PG + TX_2X_PAGES;
247 ei_status.stop_page = HP_STOP_PG;
249 ei_status.reset_8390 = &hpp_reset_8390;
250 ei_status.block_input = &hpp_io_block_input;
251 ei_status.block_output = &hpp_io_block_output;
252 ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
254 /* Check if the memory_enable flag is set in the option register. */
256 ei_status.block_input = &hpp_mem_block_input;
257 ei_status.block_output = &hpp_mem_block_output;
258 ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
259 dev->mem_start = mem_start;
260 ei_status.rmem_start = dev->mem_start + TX_2X_PAGES*256;
261 dev->mem_end = ei_status.rmem_end
262 = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
265 outw(Perf_Page, ioaddr + HP_PAGING);
267 /* Leave the 8390 and HP chip reset. */
268 outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
272 release_region(ioaddr, HP_IO_EXTENT);
277 hpp_open(struct net_device *dev)
279 int ioaddr = dev->base_addr - NIC_OFFSET;
283 if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev))) {
287 /* Reset the 8390 and HP chip. */
288 option_reg = inw(ioaddr + HPP_OPTION);
289 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
291 /* Unreset the board and enable interrupts. */
292 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
294 /* Set the wrap registers for programmed-I/O operation. */
295 outw(HW_Page, ioaddr + HP_PAGING);
296 outw((HP_START_PG + TX_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
298 /* Select the operational page. */
299 outw(Perf_Page, ioaddr + HP_PAGING);
306 hpp_close(struct net_device *dev)
308 int ioaddr = dev->base_addr - NIC_OFFSET;
309 int option_reg = inw(ioaddr + HPP_OPTION);
311 free_irq(dev->irq, dev);
313 outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
314 ioaddr + HPP_OPTION);
320 hpp_reset_8390(struct net_device *dev)
322 int ioaddr = dev->base_addr - NIC_OFFSET;
323 int option_reg = inw(ioaddr + HPP_OPTION);
325 if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
327 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
328 /* Pause a few cycles for the hardware reset to take place. */
331 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
336 if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
337 printk("%s: hp_reset_8390() did not complete.\n", dev->name);
339 if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
343 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
344 Note that transfer with the EtherTwist+ must be on word boundaries. */
347 hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
349 int ioaddr = dev->base_addr - NIC_OFFSET;
351 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
352 insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
355 /* Block input and output, similar to the Crynwr packet driver. */
358 hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
360 int ioaddr = dev->base_addr - NIC_OFFSET;
361 char *buf = skb->data;
363 outw(ring_offset, ioaddr + HPP_IN_ADDR);
364 insw(ioaddr + HP_DATAPORT, buf, count>>1);
366 buf[count-1] = inw(ioaddr + HP_DATAPORT);
369 /* The corresponding shared memory versions of the above 2 functions. */
372 hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
374 int ioaddr = dev->base_addr - NIC_OFFSET;
375 int option_reg = inw(ioaddr + HPP_OPTION);
377 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
378 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
379 isa_memcpy_fromio(hdr, dev->mem_start, sizeof(struct e8390_pkt_hdr));
380 outw(option_reg, ioaddr + HPP_OPTION);
381 hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */
385 hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
387 int ioaddr = dev->base_addr - NIC_OFFSET;
388 int option_reg = inw(ioaddr + HPP_OPTION);
390 outw(ring_offset, ioaddr + HPP_IN_ADDR);
392 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
394 /* Caution: this relies on get_8390_hdr() rounding up count!
395 Also note that we *can't* use eth_io_copy_and_sum() because
396 it will not always copy "count" bytes (e.g. padded IP). */
398 isa_memcpy_fromio(skb->data, dev->mem_start, count);
399 outw(option_reg, ioaddr + HPP_OPTION);
402 /* A special note: we *must* always transfer >=16 bit words.
403 It's always safe to round up, so we do. */
405 hpp_io_block_output(struct net_device *dev, int count,
406 const unsigned char *buf, int start_page)
408 int ioaddr = dev->base_addr - NIC_OFFSET;
409 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
410 outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
415 hpp_mem_block_output(struct net_device *dev, int count,
416 const unsigned char *buf, int start_page)
418 int ioaddr = dev->base_addr - NIC_OFFSET;
419 int option_reg = inw(ioaddr + HPP_OPTION);
421 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
422 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
423 isa_memcpy_toio(dev->mem_start, buf, (count + 3) & ~3);
424 outw(option_reg, ioaddr + HPP_OPTION);
431 #define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
432 static struct net_device *dev_hpp[MAX_HPP_CARDS];
433 static int io[MAX_HPP_CARDS];
434 static int irq[MAX_HPP_CARDS];
436 MODULE_PARM(io, "1-" __MODULE_STRING(MAX_HPP_CARDS) "i");
437 MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_HPP_CARDS) "i");
438 MODULE_PARM_DESC(io, "I/O port address(es)");
439 MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
440 MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
441 MODULE_LICENSE("GPL");
443 /* This is set up so that only a single autoprobe takes place per call.
444 ISA device autoprobes on a running machine are not recommended. */
448 struct net_device *dev;
449 int this_dev, found = 0;
451 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
452 if (io[this_dev] == 0) {
453 if (this_dev != 0) break; /* only autoprobe 1st one */
454 printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
456 dev = alloc_ei_netdev();
459 dev->irq = irq[this_dev];
460 dev->base_addr = io[this_dev];
461 if (do_hpp_probe(dev) == 0) {
462 if (register_netdev(dev) == 0) {
463 dev_hpp[found++] = dev;
469 printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
482 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
483 struct net_device *dev = dev_hpp[this_dev];
485 unregister_netdev(dev);