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/sched.h>
29 #include <linux/errno.h>
30 #include <linux/ioport.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/init.h>
34 #include <linux/delay.h>
36 #include <asm/system.h>
42 /* A zero-terminated list of I/O addresses to be probed. */
43 static unsigned int hpplus_portlist[] __initdata =
44 {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
47 The HP EtherTwist chip implementation is a fairly routine DP8390
48 implementation. It allows both shared memory and programmed-I/O buffer
49 access, using a custom interface for both. The programmed-I/O mode is
50 entirely implemented in the HP EtherTwist chip, bypassing the problem
51 ridden built-in 8390 facilities used on NE2000 designs. The shared
52 memory mode is likewise special, with an offset register used to make
53 packets appear at the shared memory base. Both modes use a base and bounds
54 page register to hide the Rx ring buffer wrap -- a packet that spans the
55 end of physical buffer memory appears continuous to the driver. (c.f. the
56 3c503 and Cabletron E2100)
58 A special note: the internal buffer of the board is only 8 bits wide.
59 This lays several nasty traps for the unaware:
60 - the 8390 must be programmed for byte-wide operations
61 - all I/O and memory operations must work on whole words (the access
62 latches are serially preloaded and have no byte-swapping ability).
64 This board is laid out in I/O space much like the earlier HP boards:
65 the first 16 locations are for the board registers, and the second 16 are
66 for the 8390. The board is easy to identify, with both a dedicated 16 bit
67 ID register and a constant 0x530* value in the upper bits of the paging
71 #define HP_ID 0x00 /* ID register, always 0x4850. */
72 #define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */
73 #define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */
74 #define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */
75 #define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */
76 #define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */
77 #define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */
78 #define HP_IO_EXTENT 32
80 #define HP_START_PG 0x00 /* First page of TX buffer */
81 #define HP_STOP_PG 0x80 /* Last page +1 of RX ring */
83 /* The register set selected in HP_PAGING. */
85 Perf_Page = 0, /* Normal operation. */
86 MAC_Page = 1, /* The ethernet address (+checksum). */
87 HW_Page = 2, /* EEPROM-loaded hardware parameters. */
88 LAN_Page = 4, /* Transceiver selection, testing, etc. */
91 /* The bit definitions for the HPP_OPTION register. */
93 NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */
94 EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
95 MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };
97 int hp_plus_probe(struct net_device *dev);
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 int __init hp_plus_probe(struct net_device *dev)
123 int base_addr = dev->base_addr;
125 SET_MODULE_OWNER(dev);
127 if (base_addr > 0x1ff) /* Check a single specified location. */
128 return hpp_probe1(dev, base_addr);
129 else if (base_addr != 0) /* Don't probe at all. */
132 for (i = 0; hpplus_portlist[i]; i++)
133 if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
139 /* Do the interesting part of the probe at a single address. */
140 static int __init hpp_probe1(struct net_device *dev, int ioaddr)
143 unsigned char checksum = 0;
144 const char name[] = "HP-PC-LAN+";
146 static unsigned version_printed;
148 if (!request_region(ioaddr, HP_IO_EXTENT, dev->name))
151 /* Check for the HP+ signature, 50 48 0x 53. */
152 if (inw(ioaddr + HP_ID) != 0x4850
153 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
158 if (ei_debug && version_printed++ == 0)
161 printk("%s: %s at %#3x,", dev->name, name, ioaddr);
163 /* Retrieve and checksum the station address. */
164 outw(MAC_Page, ioaddr + HP_PAGING);
166 for(i = 0; i < ETHER_ADDR_LEN; i++) {
167 unsigned char inval = inb(ioaddr + 8 + i);
168 dev->dev_addr[i] = inval;
170 printk(" %2.2x", inval);
172 checksum += inb(ioaddr + 14);
174 if (checksum != 0xff) {
175 printk(" bad checksum %2.2x.\n", checksum);
179 /* Point at the Software Configuration Flags. */
180 outw(ID_Page, ioaddr + HP_PAGING);
181 printk(" ID %4.4x", inw(ioaddr + 12));
184 /* Allocate dev->priv and fill in 8390 specific dev fields. */
185 if (ethdev_init(dev)) {
186 printk ("hp-plus.c: unable to allocate memory for dev->priv.\n");
191 /* Read the IRQ line. */
192 outw(HW_Page, ioaddr + HP_PAGING);
194 int irq = inb(ioaddr + 13) & 0x0f;
195 int option = inw(ioaddr + HPP_OPTION);
198 if (option & MemEnable) {
199 mem_start = inw(ioaddr + 9) << 8;
200 printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
203 printk(", IRQ %d, programmed-I/O mode.\n", irq);
207 /* Set the wrap registers for string I/O reads. */
208 outw((HP_START_PG + TX_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
210 /* Set the base address to point to the NIC, not the "real" base! */
211 dev->base_addr = ioaddr + NIC_OFFSET;
213 dev->open = &hpp_open;
214 dev->stop = &hpp_close;
216 ei_status.name = name;
217 ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */
218 ei_status.tx_start_page = HP_START_PG;
219 ei_status.rx_start_page = HP_START_PG + TX_2X_PAGES;
220 ei_status.stop_page = HP_STOP_PG;
222 ei_status.reset_8390 = &hpp_reset_8390;
223 ei_status.block_input = &hpp_io_block_input;
224 ei_status.block_output = &hpp_io_block_output;
225 ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
227 /* Check if the memory_enable flag is set in the option register. */
229 ei_status.block_input = &hpp_mem_block_input;
230 ei_status.block_output = &hpp_mem_block_output;
231 ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
232 dev->mem_start = mem_start;
233 dev->rmem_start = dev->mem_start + TX_2X_PAGES*256;
234 dev->mem_end = dev->rmem_end
235 = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
238 outw(Perf_Page, ioaddr + HP_PAGING);
240 /* Leave the 8390 and HP chip reset. */
241 outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
245 release_region(ioaddr, HP_IO_EXTENT);
250 hpp_open(struct net_device *dev)
252 int ioaddr = dev->base_addr - NIC_OFFSET;
256 if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev))) {
260 /* Reset the 8390 and HP chip. */
261 option_reg = inw(ioaddr + HPP_OPTION);
262 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
264 /* Unreset the board and enable interrupts. */
265 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
267 /* Set the wrap registers for programmed-I/O operation. */
268 outw(HW_Page, ioaddr + HP_PAGING);
269 outw((HP_START_PG + TX_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
271 /* Select the operational page. */
272 outw(Perf_Page, ioaddr + HP_PAGING);
279 hpp_close(struct net_device *dev)
281 int ioaddr = dev->base_addr - NIC_OFFSET;
282 int option_reg = inw(ioaddr + HPP_OPTION);
284 free_irq(dev->irq, dev);
286 outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
287 ioaddr + HPP_OPTION);
293 hpp_reset_8390(struct net_device *dev)
295 int ioaddr = dev->base_addr - NIC_OFFSET;
296 int option_reg = inw(ioaddr + HPP_OPTION);
298 if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
300 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
301 /* Pause a few cycles for the hardware reset to take place. */
304 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
309 if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
310 printk("%s: hp_reset_8390() did not complete.\n", dev->name);
312 if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
316 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
317 Note that transfer with the EtherTwist+ must be on word boundaries. */
320 hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
322 int ioaddr = dev->base_addr - NIC_OFFSET;
324 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
325 insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
328 /* Block input and output, similar to the Crynwr packet driver. */
331 hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
333 int ioaddr = dev->base_addr - NIC_OFFSET;
334 char *buf = skb->data;
336 outw(ring_offset, ioaddr + HPP_IN_ADDR);
337 insw(ioaddr + HP_DATAPORT, buf, count>>1);
339 buf[count-1] = inw(ioaddr + HP_DATAPORT);
342 /* The corresponding shared memory versions of the above 2 functions. */
345 hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
347 int ioaddr = dev->base_addr - NIC_OFFSET;
348 int option_reg = inw(ioaddr + HPP_OPTION);
350 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
351 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
352 isa_memcpy_fromio(hdr, dev->mem_start, sizeof(struct e8390_pkt_hdr));
353 outw(option_reg, ioaddr + HPP_OPTION);
354 hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */
358 hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
360 int ioaddr = dev->base_addr - NIC_OFFSET;
361 int option_reg = inw(ioaddr + HPP_OPTION);
363 outw(ring_offset, ioaddr + HPP_IN_ADDR);
365 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
367 /* Caution: this relies on get_8390_hdr() rounding up count!
368 Also note that we *can't* use eth_io_copy_and_sum() because
369 it will not always copy "count" bytes (e.g. padded IP). */
371 isa_memcpy_fromio(skb->data, dev->mem_start, count);
372 outw(option_reg, ioaddr + HPP_OPTION);
375 /* A special note: we *must* always transfer >=16 bit words.
376 It's always safe to round up, so we do. */
378 hpp_io_block_output(struct net_device *dev, int count,
379 const unsigned char *buf, int start_page)
381 int ioaddr = dev->base_addr - NIC_OFFSET;
382 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
383 outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
388 hpp_mem_block_output(struct net_device *dev, int count,
389 const unsigned char *buf, int start_page)
391 int ioaddr = dev->base_addr - NIC_OFFSET;
392 int option_reg = inw(ioaddr + HPP_OPTION);
394 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
395 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
396 isa_memcpy_toio(dev->mem_start, buf, (count + 3) & ~3);
397 outw(option_reg, ioaddr + HPP_OPTION);
404 #define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
405 static struct net_device dev_hpp[MAX_HPP_CARDS];
406 static int io[MAX_HPP_CARDS];
407 static int irq[MAX_HPP_CARDS];
409 MODULE_PARM(io, "1-" __MODULE_STRING(MAX_HPP_CARDS) "i");
410 MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_HPP_CARDS) "i");
411 MODULE_PARM_DESC(io, "I/O port address(es)");
412 MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
413 MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
414 MODULE_LICENSE("GPL");
416 /* This is set up so that only a single autoprobe takes place per call.
417 ISA device autoprobes on a running machine are not recommended. */
421 int this_dev, found = 0;
423 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
424 struct net_device *dev = &dev_hpp[this_dev];
425 dev->irq = irq[this_dev];
426 dev->base_addr = io[this_dev];
427 dev->init = hp_plus_probe;
428 if (io[this_dev] == 0) {
429 if (this_dev != 0) break; /* only autoprobe 1st one */
430 printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
432 if (register_netdev(dev) != 0) {
433 printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
434 if (found != 0) { /* Got at least one. */
449 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
450 struct net_device *dev = &dev_hpp[this_dev];
451 if (dev->priv != NULL) {
452 int ioaddr = dev->base_addr - NIC_OFFSET;
453 void *priv = dev->priv;
454 /* NB: hpp_close() handles free_irq */
455 release_region(ioaddr, HP_IO_EXTENT);
456 unregister_netdev(dev);
466 * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c hp-plus.c"
468 * kept-new-versions: 5