diff options
Diffstat (limited to 'drivers/net/wan/cycx_main.c')
| -rw-r--r-- | drivers/net/wan/cycx_main.c | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/drivers/net/wan/cycx_main.c b/drivers/net/wan/cycx_main.c new file mode 100644 index 00000000000..7b48064364d --- /dev/null +++ b/drivers/net/wan/cycx_main.c @@ -0,0 +1,351 @@ +/* +* cycx_main.c Cyclades Cyclom 2X WAN Link Driver. Main module. +* +* Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br> +* +* Copyright: (c) 1998-2003 Arnaldo Carvalho de Melo +* +* Based on sdlamain.c by Gene Kozin <genek@compuserve.com> & +* Jaspreet Singh <jaspreet@sangoma.com> +* +* This program is free software; you can redistribute it and/or +* modify it under the terms of the GNU General Public License +* as published by the Free Software Foundation; either version +* 2 of the License, or (at your option) any later version. +* ============================================================================ +* Please look at the bitkeeper changelog (or any other scm tool that ends up +* importing bitkeeper changelog or that replaces bitkeeper in the future as +* main tool for linux development). +* +* 2001/05/09 acme Fix MODULE_DESC for debug, .bss nitpicks, +* some cleanups +* 2000/07/13 acme remove useless #ifdef MODULE and crap +* #if KERNEL_VERSION > blah +* 2000/07/06 acme __exit at cyclomx_cleanup +* 2000/04/02 acme dprintk and cycx_debug +* module_init/module_exit +* 2000/01/21 acme rename cyclomx_open to cyclomx_mod_inc_use_count +* and cyclomx_close to cyclomx_mod_dec_use_count +* 2000/01/08 acme cleanup +* 1999/11/06 acme cycx_down back to life (it needs to be +* called to iounmap the dpmbase) +* 1999/08/09 acme removed references to enable_tx_int +* use spinlocks instead of cli/sti in +* cyclomx_set_state +* 1999/05/19 acme works directly linked into the kernel +* init_waitqueue_head for 2.3.* kernel +* 1999/05/18 acme major cleanup (polling not needed), etc +* 1998/08/28 acme minor cleanup (ioctls for firmware deleted) +* queue_task activated +* 1998/08/08 acme Initial version. +*/ + +#include <linux/config.h> /* OS configuration options */ +#include <linux/stddef.h> /* offsetof(), etc. */ +#include <linux/errno.h> /* return codes */ +#include <linux/string.h> /* inline memset(), etc. */ +#include <linux/slab.h> /* kmalloc(), kfree() */ +#include <linux/kernel.h> /* printk(), and other useful stuff */ +#include <linux/module.h> /* support for loadable modules */ +#include <linux/ioport.h> /* request_region(), release_region() */ +#include <linux/wanrouter.h> /* WAN router definitions */ +#include <linux/cyclomx.h> /* cyclomx common user API definitions */ +#include <linux/init.h> /* __init (when not using as a module) */ + +unsigned int cycx_debug; + +MODULE_AUTHOR("Arnaldo Carvalho de Melo"); +MODULE_DESCRIPTION("Cyclom 2X Sync Card Driver."); +MODULE_LICENSE("GPL"); +module_param(cycx_debug, int, 0); +MODULE_PARM_DESC(cycx_debug, "cyclomx debug level"); + +/* Defines & Macros */ + +#define CYCX_DRV_VERSION 0 /* version number */ +#define CYCX_DRV_RELEASE 11 /* release (minor version) number */ +#define CYCX_MAX_CARDS 1 /* max number of adapters */ + +#define CONFIG_CYCX_CARDS 1 + +/* Function Prototypes */ + +/* WAN link driver entry points */ +static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf); +static int cycx_wan_shutdown(struct wan_device *wandev); + +/* Miscellaneous functions */ +static irqreturn_t cycx_isr(int irq, void *dev_id, struct pt_regs *regs); + +/* Global Data + * Note: All data must be explicitly initialized!!! + */ + +/* private data */ +static char cycx_drvname[] = "cyclomx"; +static char cycx_fullname[] = "CYCLOM 2X(tm) Sync Card Driver"; +static char cycx_copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo " + "<acme@conectiva.com.br>"; +static int cycx_ncards = CONFIG_CYCX_CARDS; +static struct cycx_device *cycx_card_array; /* adapter data space */ + +/* Kernel Loadable Module Entry Points */ + +/* + * Module 'insert' entry point. + * o print announcement + * o allocate adapter data space + * o initialize static data + * o register all cards with WAN router + * o calibrate Cyclom 2X shared memory access delay. + * + * Return: 0 Ok + * < 0 error. + * Context: process + */ +int __init cycx_init(void) +{ + int cnt, err = -ENOMEM; + + printk(KERN_INFO "%s v%u.%u %s\n", + cycx_fullname, CYCX_DRV_VERSION, CYCX_DRV_RELEASE, + cycx_copyright); + + /* Verify number of cards and allocate adapter data space */ + cycx_ncards = min_t(int, cycx_ncards, CYCX_MAX_CARDS); + cycx_ncards = max_t(int, cycx_ncards, 1); + cycx_card_array = kmalloc(sizeof(struct cycx_device) * cycx_ncards, + GFP_KERNEL); + if (!cycx_card_array) + goto out; + + memset(cycx_card_array, 0, sizeof(struct cycx_device) * cycx_ncards); + + /* Register adapters with WAN router */ + for (cnt = 0; cnt < cycx_ncards; ++cnt) { + struct cycx_device *card = &cycx_card_array[cnt]; + struct wan_device *wandev = &card->wandev; + + sprintf(card->devname, "%s%d", cycx_drvname, cnt + 1); + wandev->magic = ROUTER_MAGIC; + wandev->name = card->devname; + wandev->private = card; + wandev->setup = cycx_wan_setup; + wandev->shutdown = cycx_wan_shutdown; + err = register_wan_device(wandev); + + if (err) { + printk(KERN_ERR "%s: %s registration failed with " + "error %d!\n", + cycx_drvname, card->devname, err); + break; + } + } + + err = -ENODEV; + if (!cnt) { + kfree(cycx_card_array); + goto out; + } + err = 0; + cycx_ncards = cnt; /* adjust actual number of cards */ +out: return err; +} + +/* + * Module 'remove' entry point. + * o unregister all adapters from the WAN router + * o release all remaining system resources + */ +static void __exit cycx_exit(void) +{ + int i = 0; + + for (; i < cycx_ncards; ++i) { + struct cycx_device *card = &cycx_card_array[i]; + unregister_wan_device(card->devname); + } + + kfree(cycx_card_array); +} + +/* WAN Device Driver Entry Points */ +/* + * Setup/configure WAN link driver. + * o check adapter state + * o make sure firmware is present in configuration + * o allocate interrupt vector + * o setup Cyclom 2X hardware + * o call appropriate routine to perform protocol-specific initialization + * + * This function is called when router handles ROUTER_SETUP IOCTL. The + * configuration structure is in kernel memory (including extended data, if + * any). + */ +static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf) +{ + int rc = -EFAULT; + struct cycx_device *card; + int irq; + + /* Sanity checks */ + + if (!wandev || !wandev->private || !conf) + goto out; + + card = wandev->private; + rc = -EBUSY; + if (wandev->state != WAN_UNCONFIGURED) + goto out; + + rc = -EINVAL; + if (!conf->data_size || !conf->data) { + printk(KERN_ERR "%s: firmware not found in configuration " + "data!\n", wandev->name); + goto out; + } + + if (conf->irq <= 0) { + printk(KERN_ERR "%s: can't configure without IRQ!\n", + wandev->name); + goto out; + } + + /* Allocate IRQ */ + irq = conf->irq == 2 ? 9 : conf->irq; /* IRQ2 -> IRQ9 */ + + if (request_irq(irq, cycx_isr, 0, wandev->name, card)) { + printk(KERN_ERR "%s: can't reserve IRQ %d!\n", + wandev->name, irq); + goto out; + } + + /* Configure hardware, load firmware, etc. */ + memset(&card->hw, 0, sizeof(card->hw)); + card->hw.irq = irq; + card->hw.dpmsize = CYCX_WINDOWSIZE; + card->hw.fwid = CFID_X25_2X; + spin_lock_init(&card->lock); + init_waitqueue_head(&card->wait_stats); + + rc = cycx_setup(&card->hw, conf->data, conf->data_size, conf->maddr); + if (rc) + goto out_irq; + + /* Initialize WAN device data space */ + wandev->irq = irq; + wandev->dma = wandev->ioport = 0; + wandev->maddr = (unsigned long)card->hw.dpmbase; + wandev->msize = card->hw.dpmsize; + wandev->hw_opt[2] = 0; + wandev->hw_opt[3] = card->hw.fwid; + + /* Protocol-specific initialization */ + switch (card->hw.fwid) { +#ifdef CONFIG_CYCLOMX_X25 + case CFID_X25_2X: + rc = cycx_x25_wan_init(card, conf); + break; +#endif + default: + printk(KERN_ERR "%s: this firmware is not supported!\n", + wandev->name); + rc = -EINVAL; + } + + if (rc) { + cycx_down(&card->hw); + goto out_irq; + } + + rc = 0; +out: + return rc; +out_irq: + free_irq(irq, card); + goto out; +} + +/* + * Shut down WAN link driver. + * o shut down adapter hardware + * o release system resources. + * + * This function is called by the router when device is being unregistered or + * when it handles ROUTER_DOWN IOCTL. + */ +static int cycx_wan_shutdown(struct wan_device *wandev) +{ + int ret = -EFAULT; + struct cycx_device *card; + + /* sanity checks */ + if (!wandev || !wandev->private) + goto out; + + ret = 0; + if (wandev->state == WAN_UNCONFIGURED) + goto out; + + card = wandev->private; + wandev->state = WAN_UNCONFIGURED; + cycx_down(&card->hw); + printk(KERN_INFO "%s: irq %d being freed!\n", wandev->name, + wandev->irq); + free_irq(wandev->irq, card); +out: return ret; +} + +/* Miscellaneous */ +/* + * Cyclom 2X Interrupt Service Routine. + * o acknowledge Cyclom 2X hardware interrupt. + * o call protocol-specific interrupt service routine, if any. + */ +static irqreturn_t cycx_isr(int irq, void *dev_id, struct pt_regs *regs) +{ + struct cycx_device *card = (struct cycx_device *)dev_id; + + if (!card || card->wandev.state == WAN_UNCONFIGURED) + goto out; + + if (card->in_isr) { + printk(KERN_WARNING "%s: interrupt re-entrancy on IRQ %d!\n", + card->devname, card->wandev.irq); + goto out; + } + + if (card->isr) + card->isr(card); + return IRQ_HANDLED; +out: + return IRQ_NONE; +} + +/* Set WAN device state. */ +void cycx_set_state(struct cycx_device *card, int state) +{ + unsigned long flags; + char *string_state = NULL; + + spin_lock_irqsave(&card->lock, flags); + + if (card->wandev.state != state) { + switch (state) { + case WAN_CONNECTED: + string_state = "connected!"; + break; + case WAN_DISCONNECTED: + string_state = "disconnected!"; + break; + } + printk(KERN_INFO "%s: link %s\n", card->devname, string_state); + card->wandev.state = state; + } + + card->state_tick = jiffies; + spin_unlock_irqrestore(&card->lock, flags); +} + +module_init(cycx_init); +module_exit(cycx_exit); |