Root/drivers/net/hp.c

1/* hp.c: A HP LAN ethernet driver for linux. */
2/*
3    Written 1993-94 by Donald Becker.
4
5    Copyright 1993 United States Government as represented by the
6    Director, National Security Agency.
7
8    This software may be used and distributed according to the terms
9    of the GNU General Public License, incorporated herein by reference.
10
11    The author may be reached as becker@scyld.com, or C/O
12    Scyld Computing Corporation
13    410 Severn Ave., Suite 210
14    Annapolis MD 21403
15
16    This is a driver for the HP PC-LAN adaptors.
17
18    Sources:
19      The Crynwr packet driver.
20*/
21
22static const char version[] =
23    "hp.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
24
25
26#include <linux/module.h>
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>
34
35#include <asm/system.h>
36#include <asm/io.h>
37
38#include "8390.h"
39
40#define DRV_NAME "hp"
41
42/* A zero-terminated list of I/O addresses to be probed. */
43static unsigned int hppclan_portlist[] __initdata =
44{ 0x300, 0x320, 0x340, 0x280, 0x2C0, 0x200, 0x240, 0};
45
46#define HP_IO_EXTENT 32
47
48#define HP_DATAPORT 0x0c /* "Remote DMA" data port. */
49#define HP_ID 0x07
50#define HP_CONFIGURE 0x08 /* Configuration register. */
51#define HP_RUN 0x01 /* 1 == Run, 0 == reset. */
52#define HP_IRQ 0x0E /* Mask for software-configured IRQ line. */
53#define HP_DATAON 0x10 /* Turn on dataport */
54#define NIC_OFFSET 0x10 /* Offset the 8390 registers. */
55
56#define HP_START_PG 0x00 /* First page of TX buffer */
57#define HP_8BSTOP_PG 0x80 /* Last page +1 of RX ring */
58#define HP_16BSTOP_PG 0xFF /* Same, for 16 bit cards. */
59
60static int hp_probe1(struct net_device *dev, int ioaddr);
61
62static void hp_reset_8390(struct net_device *dev);
63static void hp_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
64                    int ring_page);
65static void hp_block_input(struct net_device *dev, int count,
66                    struct sk_buff *skb , int ring_offset);
67static void hp_block_output(struct net_device *dev, int count,
68                            const unsigned char *buf, int start_page);
69
70static void hp_init_card(struct net_device *dev);
71
72/* The map from IRQ number to HP_CONFIGURE register setting. */
73/* My default is IRQ5 0 1 2 3 4 5 6 7 8 9 10 11 */
74static char irqmap[16] __initdata= { 0, 0, 4, 6, 8,10, 0,14, 0, 4, 2,12,0,0,0,0};
75
76
77/* Probe for an HP LAN adaptor.
78    Also initialize the card and fill in STATION_ADDR with the station
79    address. */
80
81static int __init do_hp_probe(struct net_device *dev)
82{
83    int i;
84    int base_addr = dev->base_addr;
85    int irq = dev->irq;
86
87    if (base_addr > 0x1ff) /* Check a single specified location. */
88        return hp_probe1(dev, base_addr);
89    else if (base_addr != 0) /* Don't probe at all. */
90        return -ENXIO;
91
92    for (i = 0; hppclan_portlist[i]; i++) {
93        if (hp_probe1(dev, hppclan_portlist[i]) == 0)
94            return 0;
95        dev->irq = irq;
96    }
97
98    return -ENODEV;
99}
100
101#ifndef MODULE
102struct net_device * __init hp_probe(int unit)
103{
104    struct net_device *dev = alloc_eip_netdev();
105    int err;
106
107    if (!dev)
108        return ERR_PTR(-ENOMEM);
109
110    sprintf(dev->name, "eth%d", unit);
111    netdev_boot_setup_check(dev);
112
113    err = do_hp_probe(dev);
114    if (err)
115        goto out;
116    return dev;
117out:
118    free_netdev(dev);
119    return ERR_PTR(err);
120}
121#endif
122
123static int __init hp_probe1(struct net_device *dev, int ioaddr)
124{
125    int i, retval, board_id, wordmode;
126    const char *name;
127    static unsigned version_printed;
128
129    if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
130        return -EBUSY;
131
132    /* Check for the HP physical address, 08 00 09 xx xx xx. */
133    /* This really isn't good enough: we may pick up HP LANCE boards
134       also! Avoid the lance 0x5757 signature. */
135    if (inb(ioaddr) != 0x08
136        || inb(ioaddr+1) != 0x00
137        || inb(ioaddr+2) != 0x09
138        || inb(ioaddr+14) == 0x57) {
139        retval = -ENODEV;
140        goto out;
141    }
142
143    /* Set up the parameters based on the board ID.
144       If you have additional mappings, please mail them to me -djb. */
145    if ((board_id = inb(ioaddr + HP_ID)) & 0x80) {
146        name = "HP27247";
147        wordmode = 1;
148    } else {
149        name = "HP27250";
150        wordmode = 0;
151    }
152
153    if (ei_debug && version_printed++ == 0)
154        printk(version);
155
156    printk("%s: %s (ID %02x) at %#3x,", dev->name, name, board_id, ioaddr);
157
158    for(i = 0; i < ETHER_ADDR_LEN; i++)
159        dev->dev_addr[i] = inb(ioaddr + i);
160
161    printk(" %pM", dev->dev_addr);
162
163    /* Snarf the interrupt now. Someday this could be moved to open(). */
164    if (dev->irq < 2) {
165        int irq_16list[] = { 11, 10, 5, 3, 4, 7, 9, 0};
166        int irq_8list[] = { 7, 5, 3, 4, 9, 0};
167        int *irqp = wordmode ? irq_16list : irq_8list;
168        do {
169            int irq = *irqp;
170            if (request_irq (irq, NULL, 0, "bogus", NULL) != -EBUSY) {
171                unsigned long cookie = probe_irq_on();
172                /* Twinkle the interrupt, and check if it's seen. */
173                outb_p(irqmap[irq] | HP_RUN, ioaddr + HP_CONFIGURE);
174                outb_p( 0x00 | HP_RUN, ioaddr + HP_CONFIGURE);
175                if (irq == probe_irq_off(cookie) /* It's a good IRQ line! */
176                    && request_irq (irq, eip_interrupt, 0, DRV_NAME, dev) == 0) {
177                    printk(" selecting IRQ %d.\n", irq);
178                    dev->irq = *irqp;
179                    break;
180                }
181            }
182        } while (*++irqp);
183        if (*irqp == 0) {
184            printk(" no free IRQ lines.\n");
185            retval = -EBUSY;
186            goto out;
187        }
188    } else {
189        if (dev->irq == 2)
190            dev->irq = 9;
191        if ((retval = request_irq(dev->irq, eip_interrupt, 0, DRV_NAME, dev))) {
192            printk (" unable to get IRQ %d.\n", dev->irq);
193            goto out;
194        }
195    }
196
197    /* Set the base address to point to the NIC, not the "real" base! */
198    dev->base_addr = ioaddr + NIC_OFFSET;
199    dev->netdev_ops = &eip_netdev_ops;
200
201    ei_status.name = name;
202    ei_status.word16 = wordmode;
203    ei_status.tx_start_page = HP_START_PG;
204    ei_status.rx_start_page = HP_START_PG + TX_PAGES;
205    ei_status.stop_page = wordmode ? HP_16BSTOP_PG : HP_8BSTOP_PG;
206
207    ei_status.reset_8390 = &hp_reset_8390;
208    ei_status.get_8390_hdr = &hp_get_8390_hdr;
209    ei_status.block_input = &hp_block_input;
210    ei_status.block_output = &hp_block_output;
211    hp_init_card(dev);
212
213    retval = register_netdev(dev);
214    if (retval)
215        goto out1;
216    return 0;
217out1:
218    free_irq(dev->irq, dev);
219out:
220    release_region(ioaddr, HP_IO_EXTENT);
221    return retval;
222}
223
224static void
225hp_reset_8390(struct net_device *dev)
226{
227    int hp_base = dev->base_addr - NIC_OFFSET;
228    int saved_config = inb_p(hp_base + HP_CONFIGURE);
229
230    if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
231    outb_p(0x00, hp_base + HP_CONFIGURE);
232    ei_status.txing = 0;
233    /* Pause just a few cycles for the hardware reset to take place. */
234    udelay(5);
235
236    outb_p(saved_config, hp_base + HP_CONFIGURE);
237    udelay(5);
238
239    if ((inb_p(hp_base+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
240        printk("%s: hp_reset_8390() did not complete.\n", dev->name);
241
242    if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
243    return;
244}
245
246static void
247hp_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
248{
249    int nic_base = dev->base_addr;
250    int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
251
252    outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
253    outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base);
254    outb_p(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
255    outb_p(0, nic_base + EN0_RCNTHI);
256    outb_p(0, nic_base + EN0_RSARLO); /* On page boundary */
257    outb_p(ring_page, nic_base + EN0_RSARHI);
258    outb_p(E8390_RREAD+E8390_START, nic_base);
259
260    if (ei_status.word16)
261      insw(nic_base - NIC_OFFSET + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
262    else
263      insb(nic_base - NIC_OFFSET + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr));
264
265    outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
266}
267
268/* Block input and output, similar to the Crynwr packet driver. If you are
269   porting to a new ethercard look at the packet driver source for hints.
270   The HP LAN doesn't use shared memory -- we put the packet
271   out through the "remote DMA" dataport. */
272
273static void
274hp_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
275{
276    int nic_base = dev->base_addr;
277    int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
278    int xfer_count = count;
279    char *buf = skb->data;
280
281    outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
282    outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base);
283    outb_p(count & 0xff, nic_base + EN0_RCNTLO);
284    outb_p(count >> 8, nic_base + EN0_RCNTHI);
285    outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
286    outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
287    outb_p(E8390_RREAD+E8390_START, nic_base);
288    if (ei_status.word16) {
289      insw(nic_base - NIC_OFFSET + HP_DATAPORT,buf,count>>1);
290      if (count & 0x01)
291        buf[count-1] = inb(nic_base - NIC_OFFSET + HP_DATAPORT), xfer_count++;
292    } else {
293        insb(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count);
294    }
295    /* This is for the ALPHA version only, remove for later releases. */
296    if (ei_debug > 0) { /* DMA termination address check... */
297      int high = inb_p(nic_base + EN0_RSARHI);
298      int low = inb_p(nic_base + EN0_RSARLO);
299      int addr = (high << 8) + low;
300      /* Check only the lower 8 bits so we can ignore ring wrap. */
301      if (((ring_offset + xfer_count) & 0xff) != (addr & 0xff))
302        printk("%s: RX transfer address mismatch, %#4.4x vs. %#4.4x (actual).\n",
303               dev->name, ring_offset + xfer_count, addr);
304    }
305    outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
306}
307
308static void
309hp_block_output(struct net_device *dev, int count,
310                const unsigned char *buf, int start_page)
311{
312    int nic_base = dev->base_addr;
313    int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
314
315    outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
316    /* Round the count up for word writes. Do we need to do this?
317       What effect will an odd byte count have on the 8390?
318       I should check someday. */
319    if (ei_status.word16 && (count & 0x01))
320      count++;
321    /* We should already be in page 0, but to be safe... */
322    outb_p(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base);
323
324#ifdef NE8390_RW_BUGFIX
325    /* Handle the read-before-write bug the same way as the
326       Crynwr packet driver -- the NatSemi method doesn't work. */
327    outb_p(0x42, nic_base + EN0_RCNTLO);
328    outb_p(0, nic_base + EN0_RCNTHI);
329    outb_p(0xff, nic_base + EN0_RSARLO);
330    outb_p(0x00, nic_base + EN0_RSARHI);
331#define NE_CMD 0x00
332    outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
333    /* Make certain that the dummy read has occurred. */
334    inb_p(0x61);
335    inb_p(0x61);
336#endif
337
338    outb_p(count & 0xff, nic_base + EN0_RCNTLO);
339    outb_p(count >> 8, nic_base + EN0_RCNTHI);
340    outb_p(0x00, nic_base + EN0_RSARLO);
341    outb_p(start_page, nic_base + EN0_RSARHI);
342
343    outb_p(E8390_RWRITE+E8390_START, nic_base);
344    if (ei_status.word16) {
345        /* Use the 'rep' sequence for 16 bit boards. */
346        outsw(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count>>1);
347    } else {
348        outsb(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count);
349    }
350
351    /* DON'T check for 'inb_p(EN0_ISR) & ENISR_RDC' here -- it's broken! */
352
353    /* This is for the ALPHA version only, remove for later releases. */
354    if (ei_debug > 0) { /* DMA termination address check... */
355      int high = inb_p(nic_base + EN0_RSARHI);
356      int low = inb_p(nic_base + EN0_RSARLO);
357      int addr = (high << 8) + low;
358      if ((start_page << 8) + count != addr)
359        printk("%s: TX Transfer address mismatch, %#4.4x vs. %#4.4x.\n",
360               dev->name, (start_page << 8) + count, addr);
361    }
362    outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
363    return;
364}
365
366/* This function resets the ethercard if something screws up. */
367static void __init
368hp_init_card(struct net_device *dev)
369{
370    int irq = dev->irq;
371    NS8390p_init(dev, 0);
372    outb_p(irqmap[irq&0x0f] | HP_RUN,
373           dev->base_addr - NIC_OFFSET + HP_CONFIGURE);
374    return;
375}
376
377#ifdef MODULE
378#define MAX_HP_CARDS 4 /* Max number of HP cards per module */
379static struct net_device *dev_hp[MAX_HP_CARDS];
380static int io[MAX_HP_CARDS];
381static int irq[MAX_HP_CARDS];
382
383module_param_array(io, int, NULL, 0);
384module_param_array(irq, int, NULL, 0);
385MODULE_PARM_DESC(io, "I/O base address(es)");
386MODULE_PARM_DESC(irq, "IRQ number(s) (assigned)");
387MODULE_DESCRIPTION("HP PC-LAN ISA ethernet driver");
388MODULE_LICENSE("GPL");
389
390/* This is set up so that only a single autoprobe takes place per call.
391ISA device autoprobes on a running machine are not recommended. */
392int __init
393init_module(void)
394{
395    struct net_device *dev;
396    int this_dev, found = 0;
397
398    for (this_dev = 0; this_dev < MAX_HP_CARDS; this_dev++) {
399        if (io[this_dev] == 0) {
400            if (this_dev != 0) break; /* only autoprobe 1st one */
401            printk(KERN_NOTICE "hp.c: Presently autoprobing (not recommended) for a single card.\n");
402        }
403        dev = alloc_eip_netdev();
404        if (!dev)
405            break;
406        dev->irq = irq[this_dev];
407        dev->base_addr = io[this_dev];
408        if (do_hp_probe(dev) == 0) {
409            dev_hp[found++] = dev;
410            continue;
411        }
412        free_netdev(dev);
413        printk(KERN_WARNING "hp.c: No HP card found (i/o = 0x%x).\n", io[this_dev]);
414        break;
415    }
416    if (found)
417        return 0;
418    return -ENXIO;
419}
420
421static void cleanup_card(struct net_device *dev)
422{
423    free_irq(dev->irq, dev);
424    release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
425}
426
427void __exit
428cleanup_module(void)
429{
430    int this_dev;
431
432    for (this_dev = 0; this_dev < MAX_HP_CARDS; this_dev++) {
433        struct net_device *dev = dev_hp[this_dev];
434        if (dev) {
435            unregister_netdev(dev);
436            cleanup_card(dev);
437            free_netdev(dev);
438        }
439    }
440}
441#endif /* MODULE */
442

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