/*====================================================================== Aironet driver for 4500 and 4800 series cards This code is released under both the GPL version 2 and BSD licenses. Either license may be used. The respective licenses are found at the end of this file. This code was developed by Benjamin Reed including portions of which come from the Aironet PC4500 Developer's Reference Manual and used with permission. Copyright (C) 1999 Benjamin Reed. All Rights Reserved. Permission to use code in the Developer's manual was granted for this driver by Aironet. In addition this module was derived from dummy_cs. The initial developer of dummy_cs is David A. Hinds . Portions created by David A. Hinds are Copyright (C) 1999 David A. Hinds. All Rights Reserved. ======================================================================*/ #include #ifdef __IN_PCMCIA_PACKAGE__ #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* All the PCMCIA modules use PCMCIA_DEBUG to control debugging. If you do not define PCMCIA_DEBUG at all, all the debug code will be left out. If you compile with PCMCIA_DEBUG=0, the debug code will be present but disabled -- but it can then be enabled for specific modules at load time with a 'pc_debug=#' option to insmod. */ #ifdef PCMCIA_DEBUG static int pc_debug = PCMCIA_DEBUG; MODULE_PARM(pc_debug, "i"); static char *version = "$Revision: 1.1.1.1 $"; #define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args); #else #define DEBUG(n, args...) #endif /*====================================================================*/ /* Parameters that can be set with 'insmod' */ /* The old way: bit map of interrupts to choose from */ /* This means pick from 15, 14, 12, 11, 10, 9, 7, 5, 4, and 3 */ static u_int irq_mask = 0xdeb8; /* Newer, simpler way of listing specific interrupts */ static int irq_list[4] = { -1 }; MODULE_AUTHOR("Benjamin Reed"); MODULE_DESCRIPTION("Support for Cisco/Aironet 802.11 wireless ethernet \ cards. This is the module that links the PCMCIA card \ with the airo module."); MODULE_LICENSE("Dual BSD/GPL"); MODULE_SUPPORTED_DEVICE("Aironet 4500, 4800 and Cisco 340 PCMCIA cards"); MODULE_PARM(irq_mask, "i"); MODULE_PARM(irq_list, "1-4i"); /*====================================================================*/ /* The event() function is this driver's Card Services event handler. It will be called by Card Services when an appropriate card status event is received. The config() and release() entry points are used to configure or release a socket, in response to card insertion and ejection events. They are invoked from the airo_cs event handler. */ struct net_device *init_airo_card( int, int, int ); void stop_airo_card( struct net_device *, int ); int reset_airo_card( struct net_device * ); static void airo_config(dev_link_t *link); static void airo_release(u_long arg); static int airo_event(event_t event, int priority, event_callback_args_t *args); /* The attach() and detach() entry points are used to create and destroy "instances" of the driver, where each instance represents everything needed to manage one actual PCMCIA card. */ static dev_link_t *airo_attach(void); static void airo_detach(dev_link_t *); /* You'll also need to prototype all the functions that will actually be used to talk to your device. See 'pcmem_cs' for a good example of a fully self-sufficient driver; the other drivers rely more or less on other parts of the kernel. */ /* The dev_info variable is the "key" that is used to match up this device driver with appropriate cards, through the card configuration database. */ static dev_info_t dev_info = "airo_cs"; /* A linked list of "instances" of the aironet device. Each actual PCMCIA card corresponds to one device instance, and is described by one dev_link_t structure (defined in ds.h). You may not want to use a linked list for this -- for example, the memory card driver uses an array of dev_link_t pointers, where minor device numbers are used to derive the corresponding array index. */ static dev_link_t *dev_list = NULL; /* A dev_link_t structure has fields for most things that are needed to keep track of a socket, but there will usually be some device specific information that also needs to be kept track of. The 'priv' pointer in a dev_link_t structure can be used to point to a device-specific private data structure, like this. A driver needs to provide a dev_node_t structure for each device on a card. In some cases, there is only one device per card (for example, ethernet cards, modems). In other cases, there may be many actual or logical devices (SCSI adapters, memory cards with multiple partitions). The dev_node_t structures need to be kept in a linked list starting at the 'dev' field of a dev_link_t structure. We allocate them in the card's private data structure, because they generally shouldn't be allocated dynamically. In this case, we also provide a flag to indicate if a device is "stopped" due to a power management event, or card ejection. The device IO routines can use a flag like this to throttle IO to a card that is not ready to accept it. */ typedef struct local_info_t { dev_node_t node; struct net_device *eth_dev; } local_info_t; /*====================================================================*/ static void cs_error(client_handle_t handle, int func, int ret) { error_info_t err = { func, ret }; CardServices(ReportError, handle, &err); } /*====================================================================== This bit of code is used to avoid unregistering network devices at inappropriate times. 2.2 and later kernels are fairly picky about when this can happen. ======================================================================*/ static void flush_stale_links(void) { dev_link_t *link, *next; for (link = dev_list; link; link = next) { next = link->next; if (link->state & DEV_STALE_LINK) airo_detach(link); } } /*====================================================================== airo_attach() creates an "instance" of the driver, allocating local data structures for one device. The device is registered with Card Services. The dev_link structure is initialized, but we don't actually configure the card at this point -- we wait until we receive a card insertion event. ======================================================================*/ static dev_link_t *airo_attach(void) { client_reg_t client_reg; dev_link_t *link; local_info_t *local; int ret, i; DEBUG(0, "airo_attach()\n"); flush_stale_links(); /* Initialize the dev_link_t structure */ link = kmalloc(sizeof(struct dev_link_t), GFP_KERNEL); if (!link) { printk(KERN_ERR "airo_cs: no memory for new device\n"); return NULL; } memset(link, 0, sizeof(struct dev_link_t)); link->release.function = &airo_release; link->release.data = (u_long)link; /* Interrupt setup */ link->irq.Attributes = IRQ_TYPE_EXCLUSIVE; link->irq.IRQInfo1 = IRQ_INFO2_VALID|IRQ_LEVEL_ID; if (irq_list[0] == -1) link->irq.IRQInfo2 = irq_mask; else for (i = 0; i < 4; i++) link->irq.IRQInfo2 |= 1 << irq_list[i]; link->irq.Handler = NULL; /* General socket configuration defaults can go here. In this client, we assume very little, and rely on the CIS for almost everything. In most clients, many details (i.e., number, sizes, and attributes of IO windows) are fixed by the nature of the device, and can be hard-wired here. */ link->conf.Attributes = 0; link->conf.Vcc = 50; link->conf.IntType = INT_MEMORY_AND_IO; /* Allocate space for private device-specific data */ local = kmalloc(sizeof(local_info_t), GFP_KERNEL); memset(local, 0, sizeof(local_info_t)); link->priv = local; /* Register with Card Services */ link->next = dev_list; dev_list = link; client_reg.dev_info = &dev_info; client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE; client_reg.EventMask = CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL | CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET | CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME; client_reg.event_handler = &airo_event; client_reg.Version = 0x0210; client_reg.event_callback_args.client_data = link; ret = CardServices(RegisterClient, &link->handle, &client_reg); if (ret != 0) { cs_error(link->handle, RegisterClient, ret); airo_detach(link); return NULL; } return link; } /* airo_attach */ /*====================================================================== This deletes a driver "instance". The device is de-registered with Card Services. If it has been released, all local data structures are freed. Otherwise, the structures will be freed when the device is released. ======================================================================*/ static void airo_detach(dev_link_t *link) { dev_link_t **linkp; DEBUG(0, "airo_detach(0x%p)\n", link); /* Locate device structure */ for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next) if (*linkp == link) break; if (*linkp == NULL) return; del_timer(&link->release); if ( link->state & DEV_CONFIG ) { airo_release( (int)link ); if ( link->state & DEV_STALE_CONFIG ) { link->state |= DEV_STALE_LINK; return; } } if ( ((local_info_t*)link->priv)->eth_dev ) { stop_airo_card( ((local_info_t*)link->priv)->eth_dev, 0 ); } ((local_info_t*)link->priv)->eth_dev = 0; /* Break the link with Card Services */ if (link->handle) CardServices(DeregisterClient, link->handle); /* Unlink device structure, free pieces */ *linkp = link->next; if (link->priv) { kfree(link->priv); } kfree(link); } /* airo_detach */ /*====================================================================== airo_config() is scheduled to run after a CARD_INSERTION event is received, to configure the PCMCIA socket, and to make the device available to the system. ======================================================================*/ #define CS_CHECK(fn, args...) \ while ((last_ret=CardServices(last_fn=(fn),args))!=0) goto cs_failed #define CFG_CHECK(fn, args...) \ if (CardServices(fn, args) != 0) goto next_entry static void airo_config(dev_link_t *link) { client_handle_t handle; tuple_t tuple; cisparse_t parse; local_info_t *dev; int last_fn, last_ret; u_char buf[64]; win_req_t req; memreq_t map; handle = link->handle; dev = link->priv; DEBUG(0, "airo_config(0x%p)\n", link); /* This reads the card's CONFIG tuple to find its configuration registers. */ tuple.DesiredTuple = CISTPL_CONFIG; tuple.Attributes = 0; tuple.TupleData = buf; tuple.TupleDataMax = sizeof(buf); tuple.TupleOffset = 0; CS_CHECK(GetFirstTuple, handle, &tuple); CS_CHECK(GetTupleData, handle, &tuple); CS_CHECK(ParseTuple, handle, &tuple, &parse); link->conf.ConfigBase = parse.config.base; link->conf.Present = parse.config.rmask[0]; /* Configure card */ link->state |= DEV_CONFIG; /* In this loop, we scan the CIS for configuration table entries, each of which describes a valid card configuration, including voltage, IO window, memory window, and interrupt settings. We make no assumptions about the card to be configured: we use just the information available in the CIS. In an ideal world, this would work for any PCMCIA card, but it requires a complete and accurate CIS. In practice, a driver usually "knows" most of these things without consulting the CIS, and most client drivers will only use the CIS to fill in implementation-defined details. */ tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY; CS_CHECK(GetFirstTuple, handle, &tuple); while (1) { cistpl_cftable_entry_t dflt = { 0 }; cistpl_cftable_entry_t *cfg = &(parse.cftable_entry); CFG_CHECK(GetTupleData, handle, &tuple); CFG_CHECK(ParseTuple, handle, &tuple, &parse); if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg; if (cfg->index == 0) goto next_entry; link->conf.ConfigIndex = cfg->index; /* Does this card need audio output? */ if (cfg->flags & CISTPL_CFTABLE_AUDIO) { link->conf.Attributes |= CONF_ENABLE_SPKR; link->conf.Status = CCSR_AUDIO_ENA; } /* Use power settings for Vcc and Vpp if present */ /* Note that the CIS values need to be rescaled */ if (cfg->vcc.present & (1<conf.Vcc = cfg->vcc.param[CISTPL_POWER_VNOM]/10000; else if (dflt.vcc.present & (1<conf.Vcc = dflt.vcc.param[CISTPL_POWER_VNOM]/10000; if (cfg->vpp1.present & (1<conf.Vpp1 = link->conf.Vpp2 = cfg->vpp1.param[CISTPL_POWER_VNOM]/10000; else if (dflt.vpp1.present & (1<conf.Vpp1 = link->conf.Vpp2 = dflt.vpp1.param[CISTPL_POWER_VNOM]/10000; /* Do we need to allocate an interrupt? */ if (cfg->irq.IRQInfo1 || dflt.irq.IRQInfo1) link->conf.Attributes |= CONF_ENABLE_IRQ; /* IO window settings */ link->io.NumPorts1 = link->io.NumPorts2 = 0; if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) { cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io; link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO; if (!(io->flags & CISTPL_IO_8BIT)) link->io.Attributes1 = IO_DATA_PATH_WIDTH_16; if (!(io->flags & CISTPL_IO_16BIT)) link->io.Attributes1 = IO_DATA_PATH_WIDTH_8; link->io.BasePort1 = io->win[0].base; link->io.NumPorts1 = io->win[0].len; if (io->nwin > 1) { link->io.Attributes2 = link->io.Attributes1; link->io.BasePort2 = io->win[1].base; link->io.NumPorts2 = io->win[1].len; } } /* This reserves IO space but doesn't actually enable it */ CFG_CHECK(RequestIO, link->handle, &link->io); /* Now set up a common memory window, if needed. There is room in the dev_link_t structure for one memory window handle, but if the base addresses need to be saved, or if multiple windows are needed, the info should go in the private data structure for this device. Note that the memory window base is a physical address, and needs to be mapped to virtual space with ioremap() before it is used. */ if ((cfg->mem.nwin > 0) || (dflt.mem.nwin > 0)) { cistpl_mem_t *mem = (cfg->mem.nwin) ? &cfg->mem : &dflt.mem; req.Attributes = WIN_DATA_WIDTH_16|WIN_MEMORY_TYPE_CM; req.Base = mem->win[0].host_addr; req.Size = mem->win[0].len; req.AccessSpeed = 0; link->win = (window_handle_t)link->handle; CFG_CHECK(RequestWindow, &link->win, &req); map.Page = 0; map.CardOffset = mem->win[0].card_addr; CFG_CHECK(MapMemPage, link->win, &map); } /* If we got this far, we're cool! */ break; next_entry: CS_CHECK(GetNextTuple, handle, &tuple); } /* Allocate an interrupt line. Note that this does not assign a handler to the interrupt, unless the 'Handler' member of the irq structure is initialized. */ if (link->conf.Attributes & CONF_ENABLE_IRQ) CS_CHECK(RequestIRQ, link->handle, &link->irq); /* This actually configures the PCMCIA socket -- setting up the I/O windows and the interrupt mapping, and putting the card and host interface into "Memory and IO" mode. */ CS_CHECK(RequestConfiguration, link->handle, &link->conf); ((local_info_t*)link->priv)->eth_dev = init_airo_card( link->irq.AssignedIRQ, link->io.BasePort1, 1 ); if (!((local_info_t*)link->priv)->eth_dev) goto cs_failed; /* At this point, the dev_node_t structure(s) need to be initialized and arranged in a linked list at link->dev. */ strcpy(dev->node.dev_name, ((local_info_t*)link->priv)->eth_dev->name ); dev->node.major = dev->node.minor = 0; link->dev = &dev->node; /* Finally, report what we've done */ printk(KERN_INFO "%s: index 0x%02x: Vcc %d.%d", dev->node.dev_name, link->conf.ConfigIndex, link->conf.Vcc/10, link->conf.Vcc%10); if (link->conf.Vpp1) printk(", Vpp %d.%d", link->conf.Vpp1/10, link->conf.Vpp1%10); if (link->conf.Attributes & CONF_ENABLE_IRQ) printk(", irq %d", link->irq.AssignedIRQ); if (link->io.NumPorts1) printk(", io 0x%04x-0x%04x", link->io.BasePort1, link->io.BasePort1+link->io.NumPorts1-1); if (link->io.NumPorts2) printk(" & 0x%04x-0x%04x", link->io.BasePort2, link->io.BasePort2+link->io.NumPorts2-1); if (link->win) printk(", mem 0x%06lx-0x%06lx", req.Base, req.Base+req.Size-1); printk("\n"); link->state &= ~DEV_CONFIG_PENDING; return; cs_failed: cs_error(link->handle, last_fn, last_ret); airo_release((u_long)link); } /* airo_config */ /*====================================================================== After a card is removed, airo_release() will unregister the device, and release the PCMCIA configuration. If the device is still open, this will be postponed until it is closed. ======================================================================*/ static void airo_release(u_long arg) { dev_link_t *link = (dev_link_t *)arg; DEBUG(0, "airo_release(0x%p)\n", link); /* If the device is currently in use, we won't release until it is actually closed, because until then, we can't be sure that no one will try to access the device or its data structures. */ if (link->open) { DEBUG(1, "airo_cs: release postponed, '%s' still open\n", link->dev->dev_name); link->state |= DEV_STALE_CONFIG; return; } /* Unlink the device chain */ link->dev = NULL; /* In a normal driver, additional code may be needed to release other kernel data structures associated with this device. */ /* Don't bother checking to see if these succeed or not */ if (link->win) CardServices(ReleaseWindow, link->win); CardServices(ReleaseConfiguration, link->handle); if (link->io.NumPorts1) CardServices(ReleaseIO, link->handle, &link->io); if (link->irq.AssignedIRQ) CardServices(ReleaseIRQ, link->handle, &link->irq); link->state &= ~DEV_CONFIG; } /* airo_release */ /*====================================================================== The card status event handler. Mostly, this schedules other stuff to run after an event is received. When a CARD_REMOVAL event is received, we immediately set a private flag to block future accesses to this device. All the functions that actually access the device should check this flag to make sure the card is still present. ======================================================================*/ static int airo_event(event_t event, int priority, event_callback_args_t *args) { dev_link_t *link = args->client_data; local_info_t *local = link->priv; DEBUG(1, "airo_event(0x%06x)\n", event); switch (event) { case CS_EVENT_CARD_REMOVAL: link->state &= ~DEV_PRESENT; if (link->state & DEV_CONFIG) { netif_device_detach(local->eth_dev); mod_timer(&link->release, jiffies + HZ/20); } break; case CS_EVENT_CARD_INSERTION: link->state |= DEV_PRESENT | DEV_CONFIG_PENDING; airo_config(link); break; case CS_EVENT_PM_SUSPEND: link->state |= DEV_SUSPEND; /* Fall through... */ case CS_EVENT_RESET_PHYSICAL: if (link->state & DEV_CONFIG) { netif_device_detach(local->eth_dev); CardServices(ReleaseConfiguration, link->handle); } break; case CS_EVENT_PM_RESUME: link->state &= ~DEV_SUSPEND; /* Fall through... */ case CS_EVENT_CARD_RESET: if (link->state & DEV_CONFIG) { CardServices(RequestConfiguration, link->handle, &link->conf); reset_airo_card(local->eth_dev); netif_device_attach(local->eth_dev); } break; } return 0; } /* airo_event */ /*====================================================================*/ static int airo_cs_init(void) { servinfo_t serv; DEBUG(0, "%s\n", version); CardServices(GetCardServicesInfo, &serv); if (serv.Revision != CS_RELEASE_CODE) { printk(KERN_NOTICE "airo_cs: Card Services release " "does not match!\n"); return -1; } register_pcmcia_driver(&dev_info, &airo_attach, &airo_detach); return 0; } static void airo_cs_cleanup(void) { DEBUG(0, "airo_cs: unloading\n"); unregister_pcmcia_driver(&dev_info); while (dev_list != NULL) { if (dev_list->state & DEV_CONFIG) airo_release((u_long)dev_list); airo_detach(dev_list); } } /* 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. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. In addition: Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ module_init(airo_cs_init); module_exit(airo_cs_cleanup);