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![stephen hemminger](/assets/img/avatar_default.png)
Change several wan drivers to make strings and other initialize only parameters const. Compile tested only (with no new warnings) Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
348 lines
9.2 KiB
C
348 lines
9.2 KiB
C
/*
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* cycx_main.c Cyclades Cyclom 2X WAN Link Driver. Main module.
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*
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* Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* Copyright: (c) 1998-2003 Arnaldo Carvalho de Melo
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*
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* Based on sdlamain.c by Gene Kozin <genek@compuserve.com> &
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* Jaspreet Singh <jaspreet@sangoma.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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* ============================================================================
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* Please look at the bitkeeper changelog (or any other scm tool that ends up
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* importing bitkeeper changelog or that replaces bitkeeper in the future as
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* main tool for linux development).
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*
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* 2001/05/09 acme Fix MODULE_DESC for debug, .bss nitpicks,
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* some cleanups
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* 2000/07/13 acme remove useless #ifdef MODULE and crap
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* #if KERNEL_VERSION > blah
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* 2000/07/06 acme __exit at cyclomx_cleanup
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* 2000/04/02 acme dprintk and cycx_debug
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* module_init/module_exit
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* 2000/01/21 acme rename cyclomx_open to cyclomx_mod_inc_use_count
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* and cyclomx_close to cyclomx_mod_dec_use_count
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* 2000/01/08 acme cleanup
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* 1999/11/06 acme cycx_down back to life (it needs to be
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* called to iounmap the dpmbase)
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* 1999/08/09 acme removed references to enable_tx_int
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* use spinlocks instead of cli/sti in
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* cyclomx_set_state
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* 1999/05/19 acme works directly linked into the kernel
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* init_waitqueue_head for 2.3.* kernel
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* 1999/05/18 acme major cleanup (polling not needed), etc
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* 1998/08/28 acme minor cleanup (ioctls for firmware deleted)
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* queue_task activated
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* 1998/08/08 acme Initial version.
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*/
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#include <linux/stddef.h> /* offsetof(), etc. */
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#include <linux/errno.h> /* return codes */
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#include <linux/string.h> /* inline memset(), etc. */
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#include <linux/slab.h> /* kmalloc(), kfree() */
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#include <linux/kernel.h> /* printk(), and other useful stuff */
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#include <linux/module.h> /* support for loadable modules */
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#include <linux/ioport.h> /* request_region(), release_region() */
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#include <linux/wanrouter.h> /* WAN router definitions */
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#include <linux/cyclomx.h> /* cyclomx common user API definitions */
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#include <linux/init.h> /* __init (when not using as a module) */
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unsigned int cycx_debug;
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MODULE_AUTHOR("Arnaldo Carvalho de Melo");
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MODULE_DESCRIPTION("Cyclom 2X Sync Card Driver.");
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MODULE_LICENSE("GPL");
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module_param(cycx_debug, int, 0);
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MODULE_PARM_DESC(cycx_debug, "cyclomx debug level");
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/* Defines & Macros */
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#define CYCX_DRV_VERSION 0 /* version number */
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#define CYCX_DRV_RELEASE 11 /* release (minor version) number */
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#define CYCX_MAX_CARDS 1 /* max number of adapters */
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#define CONFIG_CYCX_CARDS 1
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/* Function Prototypes */
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/* WAN link driver entry points */
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static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf);
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static int cycx_wan_shutdown(struct wan_device *wandev);
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/* Miscellaneous functions */
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static irqreturn_t cycx_isr(int irq, void *dev_id);
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/* Global Data
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* Note: All data must be explicitly initialized!!!
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*/
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/* private data */
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static const char cycx_drvname[] = "cyclomx";
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static const char cycx_fullname[] = "CYCLOM 2X(tm) Sync Card Driver";
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static const char cycx_copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
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"<acme@conectiva.com.br>";
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static int cycx_ncards = CONFIG_CYCX_CARDS;
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static struct cycx_device *cycx_card_array; /* adapter data space */
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/* Kernel Loadable Module Entry Points */
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/*
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* Module 'insert' entry point.
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* o print announcement
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* o allocate adapter data space
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* o initialize static data
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* o register all cards with WAN router
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* o calibrate Cyclom 2X shared memory access delay.
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*
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* Return: 0 Ok
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* < 0 error.
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* Context: process
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*/
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static int __init cycx_init(void)
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{
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int cnt, err = -ENOMEM;
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printk(KERN_INFO "%s v%u.%u %s\n",
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cycx_fullname, CYCX_DRV_VERSION, CYCX_DRV_RELEASE,
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cycx_copyright);
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/* Verify number of cards and allocate adapter data space */
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cycx_ncards = min_t(int, cycx_ncards, CYCX_MAX_CARDS);
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cycx_ncards = max_t(int, cycx_ncards, 1);
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cycx_card_array = kcalloc(cycx_ncards, sizeof(struct cycx_device), GFP_KERNEL);
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if (!cycx_card_array)
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goto out;
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/* Register adapters with WAN router */
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for (cnt = 0; cnt < cycx_ncards; ++cnt) {
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struct cycx_device *card = &cycx_card_array[cnt];
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struct wan_device *wandev = &card->wandev;
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sprintf(card->devname, "%s%d", cycx_drvname, cnt + 1);
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wandev->magic = ROUTER_MAGIC;
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wandev->name = card->devname;
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wandev->private = card;
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wandev->setup = cycx_wan_setup;
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wandev->shutdown = cycx_wan_shutdown;
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err = register_wan_device(wandev);
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if (err) {
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printk(KERN_ERR "%s: %s registration failed with "
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"error %d!\n",
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cycx_drvname, card->devname, err);
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break;
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}
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}
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err = -ENODEV;
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if (!cnt) {
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kfree(cycx_card_array);
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goto out;
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}
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err = 0;
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cycx_ncards = cnt; /* adjust actual number of cards */
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out: return err;
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}
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/*
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* Module 'remove' entry point.
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* o unregister all adapters from the WAN router
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* o release all remaining system resources
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*/
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static void __exit cycx_exit(void)
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{
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int i = 0;
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for (; i < cycx_ncards; ++i) {
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struct cycx_device *card = &cycx_card_array[i];
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unregister_wan_device(card->devname);
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}
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kfree(cycx_card_array);
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}
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/* WAN Device Driver Entry Points */
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/*
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* Setup/configure WAN link driver.
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* o check adapter state
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* o make sure firmware is present in configuration
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* o allocate interrupt vector
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* o setup Cyclom 2X hardware
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* o call appropriate routine to perform protocol-specific initialization
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*
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* This function is called when router handles ROUTER_SETUP IOCTL. The
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* configuration structure is in kernel memory (including extended data, if
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* any).
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*/
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static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf)
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{
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int rc = -EFAULT;
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struct cycx_device *card;
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int irq;
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/* Sanity checks */
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if (!wandev || !wandev->private || !conf)
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goto out;
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card = wandev->private;
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rc = -EBUSY;
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if (wandev->state != WAN_UNCONFIGURED)
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goto out;
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rc = -EINVAL;
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if (!conf->data_size || !conf->data) {
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printk(KERN_ERR "%s: firmware not found in configuration "
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"data!\n", wandev->name);
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goto out;
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}
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if (conf->irq <= 0) {
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printk(KERN_ERR "%s: can't configure without IRQ!\n",
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wandev->name);
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goto out;
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}
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/* Allocate IRQ */
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irq = conf->irq == 2 ? 9 : conf->irq; /* IRQ2 -> IRQ9 */
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if (request_irq(irq, cycx_isr, 0, wandev->name, card)) {
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printk(KERN_ERR "%s: can't reserve IRQ %d!\n",
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wandev->name, irq);
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goto out;
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}
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/* Configure hardware, load firmware, etc. */
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memset(&card->hw, 0, sizeof(card->hw));
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card->hw.irq = irq;
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card->hw.dpmsize = CYCX_WINDOWSIZE;
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card->hw.fwid = CFID_X25_2X;
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spin_lock_init(&card->lock);
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init_waitqueue_head(&card->wait_stats);
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rc = cycx_setup(&card->hw, conf->data, conf->data_size, conf->maddr);
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if (rc)
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goto out_irq;
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/* Initialize WAN device data space */
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wandev->irq = irq;
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wandev->dma = wandev->ioport = 0;
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wandev->maddr = (unsigned long)card->hw.dpmbase;
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wandev->msize = card->hw.dpmsize;
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wandev->hw_opt[2] = 0;
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wandev->hw_opt[3] = card->hw.fwid;
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/* Protocol-specific initialization */
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switch (card->hw.fwid) {
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#ifdef CONFIG_CYCLOMX_X25
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case CFID_X25_2X:
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rc = cycx_x25_wan_init(card, conf);
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break;
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#endif
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default:
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printk(KERN_ERR "%s: this firmware is not supported!\n",
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wandev->name);
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rc = -EINVAL;
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}
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if (rc) {
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cycx_down(&card->hw);
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goto out_irq;
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}
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rc = 0;
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out:
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return rc;
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out_irq:
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free_irq(irq, card);
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goto out;
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}
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/*
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* Shut down WAN link driver.
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* o shut down adapter hardware
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* o release system resources.
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*
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* This function is called by the router when device is being unregistered or
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* when it handles ROUTER_DOWN IOCTL.
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*/
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static int cycx_wan_shutdown(struct wan_device *wandev)
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{
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int ret = -EFAULT;
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struct cycx_device *card;
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/* sanity checks */
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if (!wandev || !wandev->private)
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goto out;
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ret = 0;
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if (wandev->state == WAN_UNCONFIGURED)
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goto out;
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card = wandev->private;
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wandev->state = WAN_UNCONFIGURED;
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cycx_down(&card->hw);
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printk(KERN_INFO "%s: irq %d being freed!\n", wandev->name,
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wandev->irq);
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free_irq(wandev->irq, card);
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out: return ret;
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}
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/* Miscellaneous */
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/*
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* Cyclom 2X Interrupt Service Routine.
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* o acknowledge Cyclom 2X hardware interrupt.
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* o call protocol-specific interrupt service routine, if any.
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*/
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static irqreturn_t cycx_isr(int irq, void *dev_id)
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{
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struct cycx_device *card = dev_id;
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if (card->wandev.state == WAN_UNCONFIGURED)
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goto out;
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if (card->in_isr) {
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printk(KERN_WARNING "%s: interrupt re-entrancy on IRQ %d!\n",
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card->devname, card->wandev.irq);
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goto out;
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}
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if (card->isr)
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card->isr(card);
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return IRQ_HANDLED;
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out:
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return IRQ_NONE;
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}
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/* Set WAN device state. */
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void cycx_set_state(struct cycx_device *card, int state)
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{
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unsigned long flags;
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char *string_state = NULL;
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spin_lock_irqsave(&card->lock, flags);
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if (card->wandev.state != state) {
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switch (state) {
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case WAN_CONNECTED:
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string_state = "connected!";
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break;
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case WAN_DISCONNECTED:
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string_state = "disconnected!";
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break;
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}
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printk(KERN_INFO "%s: link %s\n", card->devname, string_state);
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card->wandev.state = state;
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}
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card->state_tick = jiffies;
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spin_unlock_irqrestore(&card->lock, flags);
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}
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module_init(cycx_init);
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module_exit(cycx_exit);
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