2 * Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards
4 * Written 1994-1999 by Avery Pennarun.
5 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
6 * Derived from skeleton.c by Donald Becker.
8 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
9 * for sponsoring the further development of this driver.
11 * **********************
13 * The original copyright of skeleton.c was as follows:
15 * skeleton.c Written 1993 by Donald Becker.
16 * Copyright 1993 United States Government as represented by the
17 * Director, National Security Agency. This software may only be used
18 * and distributed according to the terms of the GNU General Public License as
19 * modified by SRC, incorporated herein by reference.
21 * **********************
23 * For more details, see drivers/net/arcnet.c
25 * **********************
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/ioport.h>
31 #include <linux/slab.h>
32 #include <linux/delay.h>
33 #include <linux/netdevice.h>
34 #include <linux/bootmem.h>
35 #include <linux/init.h>
37 #include <linux/arcdevice.h>
40 #define VERSION "arcnet: RIM I (entirely mem-mapped) support\n"
43 /* Internal function declarations */
45 static int arcrimi_probe(struct net_device *dev);
46 static int arcrimi_found(struct net_device *dev);
47 static void arcrimi_command(struct net_device *dev, int command);
48 static int arcrimi_status(struct net_device *dev);
49 static void arcrimi_setmask(struct net_device *dev, int mask);
50 static int arcrimi_reset(struct net_device *dev, int really_reset);
51 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
52 void *buf, int count);
53 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum, int offset,
54 void *buf, int count);
56 /* Handy defines for ARCnet specific stuff */
58 /* Amount of I/O memory used by the card */
59 #define BUFFER_SIZE (512)
60 #define MIRROR_SIZE (BUFFER_SIZE*4)
62 /* COM 9026 controller chip --> ARCnet register addresses */
63 #define _INTMASK (ioaddr+0) /* writable */
64 #define _STATUS (ioaddr+0) /* readable */
65 #define _COMMAND (ioaddr+1) /* writable, returns random vals on read (?) */
66 #define _RESET (ioaddr+8) /* software reset (on read) */
67 #define _MEMDATA (ioaddr+12) /* Data port for IO-mapped memory */
68 #define _ADDR_HI (ioaddr+15) /* Control registers for said */
69 #define _ADDR_LO (ioaddr+14)
70 #define _CONFIG (ioaddr+2) /* Configuration register */
76 #define ASTATUS() readb(_STATUS)
77 #define ACOMMAND(cmd) writeb((cmd),_COMMAND)
78 #define AINTMASK(msk) writeb((msk),_INTMASK)
79 #define SETCONF() writeb(lp->config,_CONFIG)
83 * We cannot probe for a RIM I card; one reason is I don't know how to reset
84 * them. In fact, we can't even get their node ID automatically. So, we
85 * need to be passed a specific shmem address, IRQ, and node ID.
87 static int __init arcrimi_probe(struct net_device *dev)
89 BUGLVL(D_NORMAL) printk(VERSION);
90 BUGLVL(D_NORMAL) printk("E-mail me if you actually test the RIM I driver, please!\n");
92 BUGMSG(D_NORMAL, "Given: node %02Xh, shmem %lXh, irq %d\n",
93 dev->dev_addr[0], dev->mem_start, dev->irq);
95 if (dev->mem_start <= 0 || dev->irq <= 0) {
96 BUGMSG(D_NORMAL, "No autoprobe for RIM I; you "
97 "must specify the shmem and irq!\n");
101 * Grab the memory region at mem_start for BUFFER_SIZE bytes.
102 * Later in arcrimi_found() the real size will be determined
103 * and this reserve will be released and the correct size
106 if (!request_mem_region(dev->mem_start, BUFFER_SIZE, "arcnet (90xx)")) {
107 BUGMSG(D_NORMAL, "Card memory already allocated\n");
110 if (dev->dev_addr[0] == 0) {
111 release_mem_region(dev->mem_start, BUFFER_SIZE);
112 BUGMSG(D_NORMAL, "You need to specify your card's station "
116 return arcrimi_found(dev);
121 * Set up the struct net_device associated with this card. Called after
124 static int __init arcrimi_found(struct net_device *dev)
126 struct arcnet_local *lp;
127 unsigned long first_mirror, last_mirror, shmem;
131 /* reserve the irq */
132 if (request_irq(dev->irq, &arcnet_interrupt, 0, "arcnet (RIM I)", dev)) {
133 release_mem_region(dev->mem_start, BUFFER_SIZE);
134 BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
138 shmem = dev->mem_start;
139 isa_writeb(TESTvalue, shmem);
140 isa_writeb(dev->dev_addr[0], shmem + 1); /* actually the node ID */
142 /* find the real shared memory start/end points, including mirrors */
144 /* guess the actual size of one "memory mirror" - the number of
145 * bytes between copies of the shared memory. On most cards, it's
146 * 2k (or there are no mirrors at all) but on some, it's 4k.
148 mirror_size = MIRROR_SIZE;
149 if (isa_readb(shmem) == TESTvalue
150 && isa_readb(shmem - mirror_size) != TESTvalue
151 && isa_readb(shmem - 2 * mirror_size) == TESTvalue)
154 first_mirror = last_mirror = shmem;
155 while (isa_readb(first_mirror) == TESTvalue)
156 first_mirror -= mirror_size;
157 first_mirror += mirror_size;
159 while (isa_readb(last_mirror) == TESTvalue)
160 last_mirror += mirror_size;
161 last_mirror -= mirror_size;
163 dev->mem_start = first_mirror;
164 dev->mem_end = last_mirror + MIRROR_SIZE - 1;
166 /* initialize the rest of the device structure. */
169 lp->card_name = "RIM I";
170 lp->hw.command = arcrimi_command;
171 lp->hw.status = arcrimi_status;
172 lp->hw.intmask = arcrimi_setmask;
173 lp->hw.reset = arcrimi_reset;
174 lp->hw.owner = THIS_MODULE;
175 lp->hw.copy_to_card = arcrimi_copy_to_card;
176 lp->hw.copy_from_card = arcrimi_copy_from_card;
179 * re-reserve the memory region - arcrimi_probe() alloced this reqion
180 * but didn't know the real size. Free that region and then re-get
181 * with the correct size. There is a VERY slim chance this could
184 release_mem_region(shmem, BUFFER_SIZE);
185 if (!request_mem_region(dev->mem_start,
186 dev->mem_end - dev->mem_start + 1,
188 BUGMSG(D_NORMAL, "Card memory already allocated\n");
192 lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
193 if (!lp->mem_start) {
194 BUGMSG(D_NORMAL, "Can't remap device memory!\n");
195 goto err_release_mem;
198 /* get and check the station ID from offset 1 in shmem */
199 dev->dev_addr[0] = readb(lp->mem_start + 1);
201 BUGMSG(D_NORMAL, "ARCnet RIM I: station %02Xh found at IRQ %d, "
202 "ShMem %lXh (%ld*%d bytes).\n",
204 dev->irq, dev->mem_start,
205 (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
207 err = register_netdev(dev);
214 iounmap(lp->mem_start);
216 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
218 free_irq(dev->irq, dev);
224 * Do a hardware reset on the card, and set up necessary registers.
226 * This should be called as little as possible, because it disrupts the
227 * token on the network (causes a RECON) and requires a significant delay.
229 * However, it does make sure the card is in a defined state.
231 static int arcrimi_reset(struct net_device *dev, int really_reset)
233 struct arcnet_local *lp = dev->priv;
234 void __iomem *ioaddr = lp->mem_start + 0x800;
236 BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS());
239 writeb(TESTvalue, ioaddr - 0x800); /* fake reset */
242 ACOMMAND(CFLAGScmd | RESETclear); /* clear flags & end reset */
243 ACOMMAND(CFLAGScmd | CONFIGclear);
245 /* enable extended (512-byte) packets */
246 ACOMMAND(CONFIGcmd | EXTconf);
248 /* done! return success. */
252 static void arcrimi_setmask(struct net_device *dev, int mask)
254 struct arcnet_local *lp = dev->priv;
255 void __iomem *ioaddr = lp->mem_start + 0x800;
260 static int arcrimi_status(struct net_device *dev)
262 struct arcnet_local *lp = dev->priv;
263 void __iomem *ioaddr = lp->mem_start + 0x800;
268 static void arcrimi_command(struct net_device *dev, int cmd)
270 struct arcnet_local *lp = dev->priv;
271 void __iomem *ioaddr = lp->mem_start + 0x800;
276 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
277 void *buf, int count)
279 struct arcnet_local *lp = dev->priv;
280 void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
281 TIME("memcpy_toio", count, memcpy_toio(memaddr, buf, count));
285 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum, int offset,
286 void *buf, int count)
288 struct arcnet_local *lp = dev->priv;
289 void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
290 TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
294 static int io; /* use the insmod io= irq= node= options */
296 static char device[9]; /* use eg. device=arc1 to change name */
298 module_param(node, int, 0);
299 module_param(io, int, 0);
300 module_param(irq, int, 0);
301 module_param_string(device, device, sizeof(device), 0);
302 MODULE_LICENSE("GPL");
304 static struct net_device *my_dev;
306 static int __init arc_rimi_init(void)
308 struct net_device *dev;
310 dev = alloc_arcdev(device);
314 if (node && node != 0xff)
315 dev->dev_addr[0] = node;
322 if (arcrimi_probe(dev)) {
331 static void __exit arc_rimi_exit(void)
333 struct net_device *dev = my_dev;
334 struct arcnet_local *lp = dev->priv;
336 unregister_netdev(dev);
337 iounmap(lp->mem_start);
338 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
339 free_irq(dev->irq, dev);
344 static int __init arcrimi_setup(char *s)
347 s = get_options(s, 8, ints);
352 printk("arcrimi: Too many arguments.\n");
353 case 3: /* Node ID */
357 case 1: /* IO address */
361 snprintf(device, sizeof(device), "%s", s);
364 __setup("arcrimi=", arcrimi_setup);
367 module_init(arc_rimi_init)
368 module_exit(arc_rimi_exit)