2 * cycx_main.c Cyclades Cyclom 2X WAN Link Driver. Main module.
4 * Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
6 * Copyright: (c) 1998-2003 Arnaldo Carvalho de Melo
8 * Based on sdlamain.c by Gene Kozin <genek@compuserve.com> &
9 * Jaspreet Singh <jaspreet@sangoma.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 * ============================================================================
16 * Please look at the bitkeeper changelog (or any other scm tool that ends up
17 * importing bitkeeper changelog or that replaces bitkeeper in the future as
18 * main tool for linux development).
20 * 2001/05/09 acme Fix MODULE_DESC for debug, .bss nitpicks,
22 * 2000/07/13 acme remove useless #ifdef MODULE and crap
23 * #if KERNEL_VERSION > blah
24 * 2000/07/06 acme __exit at cyclomx_cleanup
25 * 2000/04/02 acme dprintk and cycx_debug
26 * module_init/module_exit
27 * 2000/01/21 acme rename cyclomx_open to cyclomx_mod_inc_use_count
28 * and cyclomx_close to cyclomx_mod_dec_use_count
29 * 2000/01/08 acme cleanup
30 * 1999/11/06 acme cycx_down back to life (it needs to be
31 * called to iounmap the dpmbase)
32 * 1999/08/09 acme removed references to enable_tx_int
33 * use spinlocks instead of cli/sti in
35 * 1999/05/19 acme works directly linked into the kernel
36 * init_waitqueue_head for 2.3.* kernel
37 * 1999/05/18 acme major cleanup (polling not needed), etc
38 * 1998/08/28 acme minor cleanup (ioctls for firmware deleted)
39 * queue_task activated
40 * 1998/08/08 acme Initial version.
43 #include <linux/stddef.h> /* offsetof(), etc. */
44 #include <linux/errno.h> /* return codes */
45 #include <linux/string.h> /* inline memset(), etc. */
46 #include <linux/slab.h> /* kmalloc(), kfree() */
47 #include <linux/kernel.h> /* printk(), and other useful stuff */
48 #include <linux/module.h> /* support for loadable modules */
49 #include <linux/ioport.h> /* request_region(), release_region() */
50 #include <linux/wanrouter.h> /* WAN router definitions */
51 #include <linux/cyclomx.h> /* cyclomx common user API definitions */
52 #include <linux/init.h> /* __init (when not using as a module) */
54 unsigned int cycx_debug;
56 MODULE_AUTHOR("Arnaldo Carvalho de Melo");
57 MODULE_DESCRIPTION("Cyclom 2X Sync Card Driver.");
58 MODULE_LICENSE("GPL");
59 module_param(cycx_debug, int, 0);
60 MODULE_PARM_DESC(cycx_debug, "cyclomx debug level");
62 /* Defines & Macros */
64 #define CYCX_DRV_VERSION 0 /* version number */
65 #define CYCX_DRV_RELEASE 11 /* release (minor version) number */
66 #define CYCX_MAX_CARDS 1 /* max number of adapters */
68 #define CONFIG_CYCX_CARDS 1
70 /* Function Prototypes */
72 /* WAN link driver entry points */
73 static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf);
74 static int cycx_wan_shutdown(struct wan_device *wandev);
76 /* Miscellaneous functions */
77 static irqreturn_t cycx_isr(int irq, void *dev_id, struct pt_regs *regs);
80 * Note: All data must be explicitly initialized!!!
84 static char cycx_drvname[] = "cyclomx";
85 static char cycx_fullname[] = "CYCLOM 2X(tm) Sync Card Driver";
86 static char cycx_copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
87 "<acme@conectiva.com.br>";
88 static int cycx_ncards = CONFIG_CYCX_CARDS;
89 static struct cycx_device *cycx_card_array; /* adapter data space */
91 /* Kernel Loadable Module Entry Points */
94 * Module 'insert' entry point.
95 * o print announcement
96 * o allocate adapter data space
97 * o initialize static data
98 * o register all cards with WAN router
99 * o calibrate Cyclom 2X shared memory access delay.
105 static int __init cycx_init(void)
107 int cnt, err = -ENOMEM;
109 printk(KERN_INFO "%s v%u.%u %s\n",
110 cycx_fullname, CYCX_DRV_VERSION, CYCX_DRV_RELEASE,
113 /* Verify number of cards and allocate adapter data space */
114 cycx_ncards = min_t(int, cycx_ncards, CYCX_MAX_CARDS);
115 cycx_ncards = max_t(int, cycx_ncards, 1);
116 cycx_card_array = kmalloc(sizeof(struct cycx_device) * cycx_ncards,
118 if (!cycx_card_array)
121 memset(cycx_card_array, 0, sizeof(struct cycx_device) * cycx_ncards);
123 /* Register adapters with WAN router */
124 for (cnt = 0; cnt < cycx_ncards; ++cnt) {
125 struct cycx_device *card = &cycx_card_array[cnt];
126 struct wan_device *wandev = &card->wandev;
128 sprintf(card->devname, "%s%d", cycx_drvname, cnt + 1);
129 wandev->magic = ROUTER_MAGIC;
130 wandev->name = card->devname;
131 wandev->private = card;
132 wandev->setup = cycx_wan_setup;
133 wandev->shutdown = cycx_wan_shutdown;
134 err = register_wan_device(wandev);
137 printk(KERN_ERR "%s: %s registration failed with "
139 cycx_drvname, card->devname, err);
146 kfree(cycx_card_array);
150 cycx_ncards = cnt; /* adjust actual number of cards */
155 * Module 'remove' entry point.
156 * o unregister all adapters from the WAN router
157 * o release all remaining system resources
159 static void __exit cycx_exit(void)
163 for (; i < cycx_ncards; ++i) {
164 struct cycx_device *card = &cycx_card_array[i];
165 unregister_wan_device(card->devname);
168 kfree(cycx_card_array);
171 /* WAN Device Driver Entry Points */
173 * Setup/configure WAN link driver.
174 * o check adapter state
175 * o make sure firmware is present in configuration
176 * o allocate interrupt vector
177 * o setup Cyclom 2X hardware
178 * o call appropriate routine to perform protocol-specific initialization
180 * This function is called when router handles ROUTER_SETUP IOCTL. The
181 * configuration structure is in kernel memory (including extended data, if
184 static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf)
187 struct cycx_device *card;
192 if (!wandev || !wandev->private || !conf)
195 card = wandev->private;
197 if (wandev->state != WAN_UNCONFIGURED)
201 if (!conf->data_size || !conf->data) {
202 printk(KERN_ERR "%s: firmware not found in configuration "
203 "data!\n", wandev->name);
207 if (conf->irq <= 0) {
208 printk(KERN_ERR "%s: can't configure without IRQ!\n",
214 irq = conf->irq == 2 ? 9 : conf->irq; /* IRQ2 -> IRQ9 */
216 if (request_irq(irq, cycx_isr, 0, wandev->name, card)) {
217 printk(KERN_ERR "%s: can't reserve IRQ %d!\n",
222 /* Configure hardware, load firmware, etc. */
223 memset(&card->hw, 0, sizeof(card->hw));
225 card->hw.dpmsize = CYCX_WINDOWSIZE;
226 card->hw.fwid = CFID_X25_2X;
227 spin_lock_init(&card->lock);
228 init_waitqueue_head(&card->wait_stats);
230 rc = cycx_setup(&card->hw, conf->data, conf->data_size, conf->maddr);
234 /* Initialize WAN device data space */
236 wandev->dma = wandev->ioport = 0;
237 wandev->maddr = (unsigned long)card->hw.dpmbase;
238 wandev->msize = card->hw.dpmsize;
239 wandev->hw_opt[2] = 0;
240 wandev->hw_opt[3] = card->hw.fwid;
242 /* Protocol-specific initialization */
243 switch (card->hw.fwid) {
244 #ifdef CONFIG_CYCLOMX_X25
246 rc = cycx_x25_wan_init(card, conf);
250 printk(KERN_ERR "%s: this firmware is not supported!\n",
256 cycx_down(&card->hw);
269 * Shut down WAN link driver.
270 * o shut down adapter hardware
271 * o release system resources.
273 * This function is called by the router when device is being unregistered or
274 * when it handles ROUTER_DOWN IOCTL.
276 static int cycx_wan_shutdown(struct wan_device *wandev)
279 struct cycx_device *card;
282 if (!wandev || !wandev->private)
286 if (wandev->state == WAN_UNCONFIGURED)
289 card = wandev->private;
290 wandev->state = WAN_UNCONFIGURED;
291 cycx_down(&card->hw);
292 printk(KERN_INFO "%s: irq %d being freed!\n", wandev->name,
294 free_irq(wandev->irq, card);
300 * Cyclom 2X Interrupt Service Routine.
301 * o acknowledge Cyclom 2X hardware interrupt.
302 * o call protocol-specific interrupt service routine, if any.
304 static irqreturn_t cycx_isr(int irq, void *dev_id, struct pt_regs *regs)
306 struct cycx_device *card = (struct cycx_device *)dev_id;
308 if (!card || card->wandev.state == WAN_UNCONFIGURED)
312 printk(KERN_WARNING "%s: interrupt re-entrancy on IRQ %d!\n",
313 card->devname, card->wandev.irq);
324 /* Set WAN device state. */
325 void cycx_set_state(struct cycx_device *card, int state)
328 char *string_state = NULL;
330 spin_lock_irqsave(&card->lock, flags);
332 if (card->wandev.state != state) {
335 string_state = "connected!";
337 case WAN_DISCONNECTED:
338 string_state = "disconnected!";
341 printk(KERN_INFO "%s: link %s\n", card->devname, string_state);
342 card->wandev.state = state;
345 card->state_tick = jiffies;
346 spin_unlock_irqrestore(&card->lock, flags);
349 module_init(cycx_init);
350 module_exit(cycx_exit);