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 #define DRV_NAME "hp-plus"
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 static int hpp_probe1(struct net_device *dev, int ioaddr);
99 static void hpp_reset_8390(struct net_device *dev);
100 static int hpp_open(struct net_device *dev);
101 static int hpp_close(struct net_device *dev);
102 static void hpp_mem_block_input(struct net_device *dev, int count,
103 struct sk_buff *skb, int ring_offset);
104 static void hpp_mem_block_output(struct net_device *dev, int count,
105 const unsigned char *buf, int start_page);
106 static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
108 static void hpp_io_block_input(struct net_device *dev, int count,
109 struct sk_buff *skb, int ring_offset);
110 static void hpp_io_block_output(struct net_device *dev, int count,
111 const unsigned char *buf, int start_page);
112 static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
116 /* Probe a list of addresses for an HP LAN+ adaptor.
117 This routine is almost boilerplate. */
119 static int __init do_hpp_probe(struct net_device *dev)
122 int base_addr = dev->base_addr;
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)
140 struct net_device * __init hp_plus_probe(int unit)
142 struct net_device *dev = alloc_ei_netdev();
146 return ERR_PTR(-ENOMEM);
148 sprintf(dev->name, "eth%d", unit);
149 netdev_boot_setup_check(dev);
151 err = do_hpp_probe(dev);
161 /* Do the interesting part of the probe at a single address. */
162 static int __init hpp_probe1(struct net_device *dev, int ioaddr)
165 unsigned char checksum = 0;
166 const char name[] = "HP-PC-LAN+";
168 static unsigned version_printed;
170 if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
173 /* Check for the HP+ signature, 50 48 0x 53. */
174 if (inw(ioaddr + HP_ID) != 0x4850
175 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
180 if (ei_debug && version_printed++ == 0)
183 printk("%s: %s at %#3x,", dev->name, name, ioaddr);
185 /* Retrieve and checksum the station address. */
186 outw(MAC_Page, ioaddr + HP_PAGING);
188 for(i = 0; i < ETHER_ADDR_LEN; i++) {
189 unsigned char inval = inb(ioaddr + 8 + i);
190 dev->dev_addr[i] = inval;
192 printk(" %2.2x", inval);
194 checksum += inb(ioaddr + 14);
196 if (checksum != 0xff) {
197 printk(" bad checksum %2.2x.\n", checksum);
201 /* Point at the Software Configuration Flags. */
202 outw(ID_Page, ioaddr + HP_PAGING);
203 printk(" ID %4.4x", inw(ioaddr + 12));
206 /* Read the IRQ line. */
207 outw(HW_Page, ioaddr + HP_PAGING);
209 int irq = inb(ioaddr + 13) & 0x0f;
210 int option = inw(ioaddr + HPP_OPTION);
213 if (option & MemEnable) {
214 mem_start = inw(ioaddr + 9) << 8;
215 printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
218 printk(", IRQ %d, programmed-I/O mode.\n", irq);
222 /* Set the wrap registers for string I/O reads. */
223 outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
225 /* Set the base address to point to the NIC, not the "real" base! */
226 dev->base_addr = ioaddr + NIC_OFFSET;
228 dev->open = &hpp_open;
229 dev->stop = &hpp_close;
230 #ifdef CONFIG_NET_POLL_CONTROLLER
231 dev->poll_controller = ei_poll;
234 ei_status.name = name;
235 ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */
236 ei_status.tx_start_page = HP_START_PG;
237 ei_status.rx_start_page = HP_START_PG + TX_PAGES/2;
238 ei_status.stop_page = HP_STOP_PG;
240 ei_status.reset_8390 = &hpp_reset_8390;
241 ei_status.block_input = &hpp_io_block_input;
242 ei_status.block_output = &hpp_io_block_output;
243 ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
245 /* Check if the memory_enable flag is set in the option register. */
247 ei_status.block_input = &hpp_mem_block_input;
248 ei_status.block_output = &hpp_mem_block_output;
249 ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
250 dev->mem_start = mem_start;
251 ei_status.mem = ioremap(mem_start,
252 (HP_STOP_PG - HP_START_PG)*256);
253 if (!ei_status.mem) {
257 ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256;
258 dev->mem_end = ei_status.rmem_end
259 = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
262 outw(Perf_Page, ioaddr + HP_PAGING);
264 /* Leave the 8390 and HP chip reset. */
265 outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
267 retval = register_netdev(dev);
272 iounmap(ei_status.mem);
274 release_region(ioaddr, HP_IO_EXTENT);
279 hpp_open(struct net_device *dev)
281 int ioaddr = dev->base_addr - NIC_OFFSET;
285 if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev))) {
289 /* Reset the 8390 and HP chip. */
290 option_reg = inw(ioaddr + HPP_OPTION);
291 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
293 /* Unreset the board and enable interrupts. */
294 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
296 /* Set the wrap registers for programmed-I/O operation. */
297 outw(HW_Page, ioaddr + HP_PAGING);
298 outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
300 /* Select the operational page. */
301 outw(Perf_Page, ioaddr + HP_PAGING);
308 hpp_close(struct net_device *dev)
310 int ioaddr = dev->base_addr - NIC_OFFSET;
311 int option_reg = inw(ioaddr + HPP_OPTION);
313 free_irq(dev->irq, dev);
315 outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
316 ioaddr + HPP_OPTION);
322 hpp_reset_8390(struct net_device *dev)
324 int ioaddr = dev->base_addr - NIC_OFFSET;
325 int option_reg = inw(ioaddr + HPP_OPTION);
327 if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
329 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
330 /* Pause a few cycles for the hardware reset to take place. */
333 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
338 if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
339 printk("%s: hp_reset_8390() did not complete.\n", dev->name);
341 if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
345 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
346 Note that transfer with the EtherTwist+ must be on word boundaries. */
349 hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
351 int ioaddr = dev->base_addr - NIC_OFFSET;
353 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
354 insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
357 /* Block input and output, similar to the Crynwr packet driver. */
360 hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
362 int ioaddr = dev->base_addr - NIC_OFFSET;
363 char *buf = skb->data;
365 outw(ring_offset, ioaddr + HPP_IN_ADDR);
366 insw(ioaddr + HP_DATAPORT, buf, count>>1);
368 buf[count-1] = inw(ioaddr + HP_DATAPORT);
371 /* The corresponding shared memory versions of the above 2 functions. */
374 hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
376 int ioaddr = dev->base_addr - NIC_OFFSET;
377 int option_reg = inw(ioaddr + HPP_OPTION);
379 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
380 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
381 memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr));
382 outw(option_reg, ioaddr + HPP_OPTION);
383 hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */
387 hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
389 int ioaddr = dev->base_addr - NIC_OFFSET;
390 int option_reg = inw(ioaddr + HPP_OPTION);
392 outw(ring_offset, ioaddr + HPP_IN_ADDR);
394 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
396 /* Caution: this relies on get_8390_hdr() rounding up count!
397 Also note that we *can't* use eth_io_copy_and_sum() because
398 it will not always copy "count" bytes (e.g. padded IP). */
400 memcpy_fromio(skb->data, ei_status.mem, count);
401 outw(option_reg, ioaddr + HPP_OPTION);
404 /* A special note: we *must* always transfer >=16 bit words.
405 It's always safe to round up, so we do. */
407 hpp_io_block_output(struct net_device *dev, int count,
408 const unsigned char *buf, int start_page)
410 int ioaddr = dev->base_addr - NIC_OFFSET;
411 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
412 outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
417 hpp_mem_block_output(struct net_device *dev, int count,
418 const unsigned char *buf, int start_page)
420 int ioaddr = dev->base_addr - NIC_OFFSET;
421 int option_reg = inw(ioaddr + HPP_OPTION);
423 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
424 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
425 memcpy_toio(ei_status.mem, buf, (count + 3) & ~3);
426 outw(option_reg, ioaddr + HPP_OPTION);
433 #define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
434 static struct net_device *dev_hpp[MAX_HPP_CARDS];
435 static int io[MAX_HPP_CARDS];
436 static int irq[MAX_HPP_CARDS];
438 module_param_array(io, int, NULL, 0);
439 module_param_array(irq, int, NULL, 0);
440 MODULE_PARM_DESC(io, "I/O port address(es)");
441 MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
442 MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
443 MODULE_LICENSE("GPL");
445 /* This is set up so that only a single autoprobe takes place per call.
446 ISA device autoprobes on a running machine are not recommended. */
450 struct net_device *dev;
451 int this_dev, found = 0;
453 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
454 if (io[this_dev] == 0) {
455 if (this_dev != 0) break; /* only autoprobe 1st one */
456 printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
458 dev = alloc_ei_netdev();
461 dev->irq = irq[this_dev];
462 dev->base_addr = io[this_dev];
463 if (do_hpp_probe(dev) == 0) {
464 dev_hpp[found++] = dev;
468 printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
476 static void cleanup_card(struct net_device *dev)
478 /* NB: hpp_close() handles free_irq */
479 iounmap(ei_status.mem);
480 release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
488 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
489 struct net_device *dev = dev_hpp[this_dev];
491 unregister_netdev(dev);