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 * **********************
28 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/ioport.h>
34 #include <linux/delay.h>
35 #include <linux/netdevice.h>
36 #include <linux/bootmem.h>
37 #include <linux/init.h>
38 #include <linux/interrupt.h>
41 #include "arcdevice.h"
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,
54 int offset, 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)
81 /* We cannot probe for a RIM I card; one reason is I don't know how to reset
82 * them. In fact, we can't even get their node ID automatically. So, we
83 * need to be passed a specific shmem address, IRQ, and node ID.
85 static int __init arcrimi_probe(struct net_device *dev)
87 if (BUGLVL(D_NORMAL)) {
88 pr_info("%s\n", "RIM I (entirely mem-mapped) support");
89 pr_info("E-mail me if you actually test the RIM I driver, please!\n");
90 pr_info("Given: node %02Xh, shmem %lXh, irq %d\n",
91 dev->dev_addr[0], dev->mem_start, dev->irq);
94 if (dev->mem_start <= 0 || dev->irq <= 0) {
96 pr_err("No autoprobe for RIM I; you must specify the shmem and irq!\n");
99 if (dev->dev_addr[0] == 0) {
100 if (BUGLVL(D_NORMAL))
101 pr_err("You need to specify your card's station ID!\n");
104 /* Grab the memory region at mem_start for MIRROR_SIZE bytes.
105 * Later in arcrimi_found() the real size will be determined
106 * and this reserve will be released and the correct size
109 if (!request_mem_region(dev->mem_start, MIRROR_SIZE, "arcnet (90xx)")) {
110 if (BUGLVL(D_NORMAL))
111 pr_notice("Card memory already allocated\n");
114 return arcrimi_found(dev);
117 static int check_mirror(unsigned long addr, size_t size)
122 if (!request_mem_region(addr, size, "arcnet (90xx)"))
125 p = ioremap(addr, size);
127 if (readb(p) == TESTvalue)
134 release_mem_region(addr, size);
138 /* Set up the struct net_device associated with this card.
139 * Called after probing succeeds.
141 static int __init arcrimi_found(struct net_device *dev)
143 struct arcnet_local *lp;
144 unsigned long first_mirror, last_mirror, shmem;
149 p = ioremap(dev->mem_start, MIRROR_SIZE);
151 release_mem_region(dev->mem_start, MIRROR_SIZE);
152 arc_printk(D_NORMAL, dev, "Can't ioremap\n");
156 /* reserve the irq */
157 if (request_irq(dev->irq, arcnet_interrupt, 0, "arcnet (RIM I)", dev)) {
159 release_mem_region(dev->mem_start, MIRROR_SIZE);
160 arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
164 shmem = dev->mem_start;
165 writeb(TESTvalue, p);
166 writeb(dev->dev_addr[0], p + 1); /* actually the node ID */
168 /* find the real shared memory start/end points, including mirrors */
170 /* guess the actual size of one "memory mirror" - the number of
171 * bytes between copies of the shared memory. On most cards, it's
172 * 2k (or there are no mirrors at all) but on some, it's 4k.
174 mirror_size = MIRROR_SIZE;
175 if (readb(p) == TESTvalue &&
176 check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
177 check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
178 mirror_size = 2 * MIRROR_SIZE;
180 first_mirror = shmem - mirror_size;
181 while (check_mirror(first_mirror, mirror_size) == 1)
182 first_mirror -= mirror_size;
183 first_mirror += mirror_size;
185 last_mirror = shmem + mirror_size;
186 while (check_mirror(last_mirror, mirror_size) == 1)
187 last_mirror += mirror_size;
188 last_mirror -= mirror_size;
190 dev->mem_start = first_mirror;
191 dev->mem_end = last_mirror + MIRROR_SIZE - 1;
193 /* initialize the rest of the device structure. */
195 lp = netdev_priv(dev);
196 lp->card_name = "RIM I";
197 lp->hw.command = arcrimi_command;
198 lp->hw.status = arcrimi_status;
199 lp->hw.intmask = arcrimi_setmask;
200 lp->hw.reset = arcrimi_reset;
201 lp->hw.owner = THIS_MODULE;
202 lp->hw.copy_to_card = arcrimi_copy_to_card;
203 lp->hw.copy_from_card = arcrimi_copy_from_card;
205 /* re-reserve the memory region - arcrimi_probe() alloced this reqion
206 * but didn't know the real size. Free that region and then re-get
207 * with the correct size. There is a VERY slim chance this could
211 release_mem_region(shmem, MIRROR_SIZE);
212 if (!request_mem_region(dev->mem_start,
213 dev->mem_end - dev->mem_start + 1,
215 arc_printk(D_NORMAL, dev, "Card memory already allocated\n");
219 lp->mem_start = ioremap(dev->mem_start,
220 dev->mem_end - dev->mem_start + 1);
221 if (!lp->mem_start) {
222 arc_printk(D_NORMAL, dev, "Can't remap device memory!\n");
223 goto err_release_mem;
226 /* get and check the station ID from offset 1 in shmem */
227 dev->dev_addr[0] = readb(lp->mem_start + 1);
229 arc_printk(D_NORMAL, dev, "ARCnet RIM I: station %02Xh found at IRQ %d, ShMem %lXh (%ld*%d bytes)\n",
231 dev->irq, dev->mem_start,
232 (dev->mem_end - dev->mem_start + 1) / mirror_size,
235 err = register_netdev(dev);
242 iounmap(lp->mem_start);
244 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
246 free_irq(dev->irq, dev);
250 /* Do a hardware reset on the card, and set up necessary registers.
252 * This should be called as little as possible, because it disrupts the
253 * token on the network (causes a RECON) and requires a significant delay.
255 * However, it does make sure the card is in a defined state.
257 static int arcrimi_reset(struct net_device *dev, int really_reset)
259 struct arcnet_local *lp = netdev_priv(dev);
260 void __iomem *ioaddr = lp->mem_start + 0x800;
262 arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
263 dev->name, ASTATUS());
266 writeb(TESTvalue, ioaddr - 0x800); /* fake reset */
269 ACOMMAND(CFLAGScmd | RESETclear); /* clear flags & end reset */
270 ACOMMAND(CFLAGScmd | CONFIGclear);
272 /* enable extended (512-byte) packets */
273 ACOMMAND(CONFIGcmd | EXTconf);
275 /* done! return success. */
279 static void arcrimi_setmask(struct net_device *dev, int mask)
281 struct arcnet_local *lp = netdev_priv(dev);
282 void __iomem *ioaddr = lp->mem_start + 0x800;
287 static int arcrimi_status(struct net_device *dev)
289 struct arcnet_local *lp = netdev_priv(dev);
290 void __iomem *ioaddr = lp->mem_start + 0x800;
295 static void arcrimi_command(struct net_device *dev, int cmd)
297 struct arcnet_local *lp = netdev_priv(dev);
298 void __iomem *ioaddr = lp->mem_start + 0x800;
303 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
304 void *buf, int count)
306 struct arcnet_local *lp = netdev_priv(dev);
307 void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
309 TIME(dev, "memcpy_toio", count, memcpy_toio(memaddr, buf, count));
312 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum,
313 int offset, void *buf, int count)
315 struct arcnet_local *lp = netdev_priv(dev);
316 void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
318 TIME(dev, "memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
322 static int io; /* use the insmod io= irq= node= options */
324 static char device[9]; /* use eg. device=arc1 to change name */
326 module_param(node, int, 0);
327 module_param(io, int, 0);
328 module_param(irq, int, 0);
329 module_param_string(device, device, sizeof(device), 0);
330 MODULE_LICENSE("GPL");
332 static struct net_device *my_dev;
334 static int __init arc_rimi_init(void)
336 struct net_device *dev;
338 dev = alloc_arcdev(device);
342 if (node && node != 0xff)
343 dev->dev_addr[0] = node;
350 if (arcrimi_probe(dev)) {
359 static void __exit arc_rimi_exit(void)
361 struct net_device *dev = my_dev;
362 struct arcnet_local *lp = netdev_priv(dev);
364 unregister_netdev(dev);
365 iounmap(lp->mem_start);
366 release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
367 free_irq(dev->irq, dev);
372 static int __init arcrimi_setup(char *s)
376 s = get_options(s, 8, ints);
381 pr_err("Too many arguments\n");
382 case 3: /* Node ID */
386 case 1: /* IO address */
390 snprintf(device, sizeof(device), "%s", s);
393 __setup("arcrimi=", arcrimi_setup);
396 module_init(arc_rimi_init)
397 module_exit(arc_rimi_exit)