patch-2.3.21 linux/drivers/net/wan/cycx_main.c

• Lines: 380
• Date: Mon Oct 11 10:13:25 1999
• Orig file: v2.3.20/linux/drivers/net/wan/cycx_main.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.20/linux/drivers/net/wan/cycx_main.c linux/drivers/net/wan/cycx_main.c
@@ -0,0 +1,379 @@
+/*
+* cycx_main.c	Cyclades Cyclom X Multiprotocol WAN Link Driver. Main module.
+*
+* Author:	Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+*
+* Copyright:	(c) 1998, 1999 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.
+* ============================================================================
+* 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/malloc.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/tqueue.h>	/* for kernel task queues */
+#include <linux/wanrouter.h>	/* WAN router definitions */
+#include <linux/cyclomx.h>	/* cyclomx common user API definitions */
+#include <asm/uaccess.h>	/* kernel <-> user copy */
+#include <linux/init.h>         /* __init (when not using as a module) */
+
+#ifdef MODULE
+MODULE_AUTHOR("Arnaldo Carvalho de Melo");
+MODULE_DESCRIPTION("Cyclades Sync Cards Driver.");
+#endif
+
+/* Defines & Macros */
+
+#define	DRV_VERSION	0		/* version number */
+#define	DRV_RELEASE	4		/* release (minor version) number */
+#define	MAX_CARDS	1		/* max number of adapters */
+
+#ifndef	CONFIG_CYCLOMX_CARDS		/* configurable option */
+#define	CONFIG_CYCLOMX_CARDS 1
+#endif
+
+/* Function Prototypes */
+
+/* Module entry points */
+int init_module (void);
+void cleanup_module (void);
+
+/* WAN link driver entry points */
+static int setup (wan_device_t *wandev, wandev_conf_t *conf);
+static int shutdown (wan_device_t *wandev);
+static int ioctl (wan_device_t *wandev, unsigned cmd, unsigned long arg);
+
+/* Miscellaneous functions */
+static void cycx_isr (int irq, void *dev_id, struct pt_regs *regs);
+
+/* Global Data
+ * Note: All data must be explicitly initialized!!!
+ */
+
+/* private data */
+static char drvname[]	= "cyclomx";
+static char fullname[]	= "CYCLOM X(tm) Multiprotocol Driver";
+static char copyright[]	= "(c) 1998, 1999 Arnaldo Carvalho de Melo";
+static int ncards = CONFIG_CYCLOMX_CARDS;
+static cycx_t *card_array = NULL;	/* 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 CYCX shared memory access delay.
+ *
+ * Return:	0	Ok
+ *		< 0	error.
+ * Context:	process
+ */
+#ifdef MODULE
+int init_module (void)
+#else
+int __init cyclomx_init (void)
+#endif
+{
+	int cnt, err = 0;
+
+	printk(KERN_INFO "%s v%u.%u %s\n",
+		fullname, DRV_VERSION, DRV_RELEASE, copyright);
+
+	/* Verify number of cards and allocate adapter data space */
+	ncards = min(ncards, MAX_CARDS);
+	ncards = max(ncards, 1);
+	card_array = kmalloc(sizeof(cycx_t) * ncards, GFP_KERNEL);
+
+	if (card_array == NULL) return -ENOMEM;
+
+	memset(card_array, 0, sizeof(cycx_t) * ncards);
+
+	/* Register adapters with WAN router */
+	for (cnt = 0; cnt < ncards; ++cnt) {
+		cycx_t *card = &card_array[cnt];
+		wan_device_t *wandev = &card->wandev;
+
+		sprintf(card->devname, "%s%d", drvname, cnt + 1);
+		wandev->magic    = ROUTER_MAGIC;
+		wandev->name     = card->devname;
+		wandev->private  = card;
+		wandev->setup    = &setup;
+		wandev->shutdown = &shutdown;
+		wandev->ioctl    = &ioctl;
+		err = register_wan_device(wandev);
+
+		if (err) {
+			printk(KERN_ERR
+				"%s: %s registration failed with error %d!\n",
+				drvname, card->devname, err);
+			break;
+		}
+	}
+
+	if (cnt) ncards = cnt;	/* adjust actual number of cards */
+	else {
+		kfree(card_array);
+		err = -ENODEV;
+	}
+
+	return err;
+}
+
+/*
+ * Module 'remove' entry point.
+ * o unregister all adapters from the WAN router
+ * o release all remaining system resources
+ */
+#ifdef MODULE
+void cleanup_module (void)
+{
+	int i = 0;
+
+	for (; i < ncards; ++i) {
+		cycx_t *card = &card_array[i];
+		unregister_wan_device(card->devname);
+	}
+
+	kfree(card_array);
+}
+#endif
+/* WAN Device Driver Entry Points */
+/*
+ * Setup/confugure WAN link driver.
+ * o check adapter state
+ * o make sure firmware is present in configuration
+ * o allocate interrupt vector
+ * o setup CYCLOM X hardware
+ * o call appropriate routine to perform protocol-specific initialization
+ * o mark I/O region as used
+ *
+ * This function is called when router handles ROUTER_SETUP IOCTL. The
+ * configuration structure is in kernel memory (including extended data, if
+ * any).
+ */
+static int setup (wan_device_t *wandev, wandev_conf_t *conf)
+{
+	cycx_t *card;
+	int err = 0;
+	int irq;
+
+	/* Sanity checks */
+	if (!wandev || !wandev->private || !conf) return -EFAULT;
+
+	card = wandev->private;
+
+	if (wandev->state != WAN_UNCONFIGURED) return -EBUSY;
+
+	if (!conf->data_size || (conf->data == NULL)) {
+		printk(KERN_ERR "%s: firmware not found in configuration "
+				"data!\n", wandev->name);
+		return -EINVAL;
+	}
+
+	if (conf->irq <= 0) {
+		printk(KERN_ERR "%s: can't configure without IRQ!\n",
+				wandev->name);
+		return -EINVAL;
+	}
+
+	/* 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);
+		return -EINVAL;
+	}
+
+	/* Configure hardware, load firmware, etc. */
+	memset(&card->hw, 0, sizeof(cycxhw_t));
+	card->hw.irq = (conf->irq == 9) ? 2 : conf->irq;
+	card->hw.dpmbase = conf->maddr;
+	card->hw.dpmsize = CYCX_WINDOWSIZE;
+	card->hw.type = conf->hw_opt[0];
+	card->hw.fwid = CFID_X25_2X;
+	card->lock = SPIN_LOCK_UNLOCKED;
+#if LINUX_VERSION_CODE >= 0x020300
+	init_waitqueue_head(&card->wait_stats);
+#else
+	card->wait_stats = NULL;
+#endif
+	err = cycx_setup(&card->hw, conf->data, conf->data_size);
+
+	if (err) {
+		free_irq(irq, card);
+		return err;
+	}
+
+	/* Intialize 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[0] = card->hw.type;
+	wandev->hw_opt[1] = card->hw.pclk;
+	wandev->hw_opt[2] = card->hw.memory;
+	wandev->hw_opt[3] = card->hw.fwid;
+
+	/* Protocol-specific initialization */
+	switch (card->hw.fwid) {
+#ifdef CONFIG_CYCLOMX_X25
+		case CFID_X25_2X: err = cyx_init(card, conf); break;
+#endif
+		default:
+			printk(KERN_ERR "%s: this firmware is not supported!\n",
+					wandev->name);
+			err = -EINVAL;
+	}
+
+	if (err) {
+		cycx_down(&card->hw);
+		free_irq(irq, card);
+		return err;
+	}
+
+	return 0;
+}
+
+/*
+ * 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 shutdown (wan_device_t *wandev)
+{
+	cycx_t *card;
+
+	/* sanity checks */
+	if (!wandev || !wandev->private) return -EFAULT;
+
+	if (wandev->state == WAN_UNCONFIGURED) return 0;
+
+	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);
+	return 0;
+}
+
+/*
+ * Driver I/O control. 
+ * o verify arguments
+ * o perform requested action
+ *
+ * This function is called when router handles one of the reserved user
+ * IOCTLs.  Note that 'arg' stil points to user address space.
+ */
+static int ioctl (wan_device_t *wandev, unsigned cmd, unsigned long arg)
+{
+	return -EINVAL;
+}
+
+/* Miscellaneous */
+/*
+ * CYCX Interrupt Service Routine.
+ * o acknowledge CYCX hardware interrupt.
+ * o call protocol-specific interrupt service routine, if any.
+ */
+static void cycx_isr (int irq, void *dev_id, struct pt_regs *regs)
+{
+#define	card	((cycx_t*)dev_id)
+	if (!card || card->wandev.state == WAN_UNCONFIGURED)
+		return;
+
+	if (card->in_isr) {
+		printk(KERN_WARNING "%s: interrupt re-entrancy on IRQ %d!\n",
+				    card->devname, card->wandev.irq);
+		return;
+	}
+
+	if (card->isr)
+		card->isr(card);
+#undef	card
+}
+
+/*
+ * This routine is called by the protocol-specific modules when network
+ * interface is being open.  The only reason we need this, is because we
+ * have to call MOD_INC_USE_COUNT, but cannot include 'module.h' where it's
+ * defined more than once into the same kernel module.
+ */
+void cyclomx_open (cycx_t *card)
+{
+	++card->open_cnt;
+	MOD_INC_USE_COUNT;
+}
+
+/*
+ * This routine is called by the protocol-specific modules when network
+ * interface is being closed.  The only reason we need this, is because we
+ * have to call MOD_DEC_USE_COUNT, but cannot include 'module.h' where it's
+ * defined more than once into the same kernel module.
+ */
+void cyclomx_close (cycx_t *card)
+{
+	--card->open_cnt;
+	MOD_DEC_USE_COUNT;
+}
+
+/* Set WAN device state.  */
+void cyclomx_set_state (cycx_t *card, int state)
+{
+	unsigned long host_cpu_flags;
+
+	spin_lock_irqsave(&card->lock, host_cpu_flags);
+
+	if (card->wandev.state != state) {
+		switch (state) {
+			case WAN_CONNECTED:
+				printk (KERN_INFO "%s: link connected!\n",
+						  card->devname);
+				break;
+
+			case WAN_CONNECTING:
+				printk (KERN_INFO "%s: link connecting...\n",
+						  card->devname);
+				break;
+
+			case WAN_DISCONNECTED:
+				printk (KERN_INFO "%s: link disconnected!\n",
+						  card->devname);
+				break;
+		}
+
+		card->wandev.state = state;
+	}
+
+	card->state_tick = jiffies;
+	spin_unlock_irqrestore(&card->lock, host_cpu_flags);
+}
+
+/* End */