diff options
Diffstat (limited to 'drivers/isdn/hisax/elsa_cs.c')
| -rw-r--r-- | drivers/isdn/hisax/elsa_cs.c | 532 |
1 files changed, 532 insertions, 0 deletions
diff --git a/drivers/isdn/hisax/elsa_cs.c b/drivers/isdn/hisax/elsa_cs.c new file mode 100644 index 00000000000..bfc013225f4 --- /dev/null +++ b/drivers/isdn/hisax/elsa_cs.c @@ -0,0 +1,532 @@ +/*====================================================================== + + An elsa_cs PCMCIA client driver + + This driver is for the Elsa PCM ISDN Cards, i.e. the MicroLink + + + The contents of this file are subject to the Mozilla Public + License Version 1.1 (the "License"); you may not use this file + except in compliance with the License. You may obtain a copy of + the License at http://www.mozilla.org/MPL/ + + Software distributed under the License is distributed on an "AS + IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or + implied. See the License for the specific language governing + rights and limitations under the License. + + The initial developer of the original code is David A. Hinds + <dahinds@users.sourceforge.net>. Portions created by David A. Hinds + are Copyright (C) 1999 David A. Hinds. All Rights Reserved. + + Modifications from dummy_cs.c are Copyright (C) 1999-2001 Klaus + Lichtenwalder <Lichtenwalder@ACM.org>. All Rights Reserved. + + Alternatively, the contents of this file may be used under the + terms of the GNU General Public License version 2 (the "GPL"), in + which case the provisions of the GPL are applicable instead of the + above. If you wish to allow the use of your version of this file + only under the terms of the GPL and not to allow others to use + your version of this file under the MPL, indicate your decision + by deleting the provisions above and replace them with the notice + and other provisions required by the GPL. If you do not delete + the provisions above, a recipient may use your version of this + file under either the MPL or the GPL. + +======================================================================*/ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/timer.h> +#include <linux/ioport.h> +#include <asm/io.h> +#include <asm/system.h> + +#include <pcmcia/version.h> +#include <pcmcia/cs_types.h> +#include <pcmcia/cs.h> +#include <pcmcia/cistpl.h> +#include <pcmcia/cisreg.h> +#include <pcmcia/ds.h> +#include "hisax_cfg.h" + +MODULE_DESCRIPTION("ISDN4Linux: PCMCIA client driver for Elsa PCM cards"); +MODULE_AUTHOR("Klaus Lichtenwalder"); +MODULE_LICENSE("Dual MPL/GPL"); + +/* + 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_param(pc_debug, int, 0); +#define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args); +static char *version = +"elsa_cs.c $Revision: 1.2.2.4 $ $Date: 2004/01/25 15:07:06 $ (K.Lichtenwalder)"; +#else +#define DEBUG(n, args...) +#endif + +/*====================================================================*/ + +/* Parameters that can be set with 'insmod' */ + +static int protocol = 2; /* EURO-ISDN Default */ +module_param(protocol, int, 0); + +/*====================================================================*/ + +/* + 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 elsa_cs event + handler. +*/ + +static void elsa_cs_config(dev_link_t *link); +static void elsa_cs_release(dev_link_t *link); +static int elsa_cs_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 *elsa_cs_attach(void); +static void elsa_cs_detach(dev_link_t *); + +/* + 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 = "elsa_cs"; + +/* + A linked list of "instances" of the elsa_cs 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. + + To simplify the data structure handling, we actually include the + dev_link_t structure in the device's private data structure. + + 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_link_t link; + dev_node_t node; + int busy; + int cardnr; +} local_info_t; + +/*====================================================================== + + elsa_cs_attach() creates an "instance" of the driver, allocatingx + 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 *elsa_cs_attach(void) +{ + client_reg_t client_reg; + dev_link_t *link; + local_info_t *local; + int ret; + + DEBUG(0, "elsa_cs_attach()\n"); + + /* Allocate space for private device-specific data */ + local = kmalloc(sizeof(local_info_t), GFP_KERNEL); + if (!local) return NULL; + memset(local, 0, sizeof(local_info_t)); + local->cardnr = -1; + link = &local->link; link->priv = local; + + /* Interrupt setup */ + link->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING|IRQ_FIRST_SHARED; + link->irq.IRQInfo1 = IRQ_LEVEL_ID|IRQ_SHARE_ID; + 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->io.NumPorts1 = 8; + link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO; + link->io.IOAddrLines = 3; + + link->conf.Attributes = CONF_ENABLE_IRQ; + link->conf.Vcc = 50; + link->conf.IntType = INT_MEMORY_AND_IO; + + /* Register with Card Services */ + link->next = dev_list; + dev_list = link; + client_reg.dev_info = &dev_info; + 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 = &elsa_cs_event; + client_reg.Version = 0x0210; + client_reg.event_callback_args.client_data = link; + ret = pcmcia_register_client(&link->handle, &client_reg); + if (ret != CS_SUCCESS) { + cs_error(link->handle, RegisterClient, ret); + elsa_cs_detach(link); + return NULL; + } + + return link; +} /* elsa_cs_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 elsa_cs_detach(dev_link_t *link) +{ + dev_link_t **linkp; + local_info_t *info = link->priv; + int ret; + + DEBUG(0, "elsa_cs_detach(0x%p)\n", link); + + /* Locate device structure */ + for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next) + if (*linkp == link) break; + if (*linkp == NULL) + return; + + if (link->state & DEV_CONFIG) + elsa_cs_release(link); + + /* Break the link with Card Services */ + if (link->handle) { + ret = pcmcia_deregister_client(link->handle); + if (ret != CS_SUCCESS) + cs_error(link->handle, DeregisterClient, ret); + } + + /* Unlink device structure and free it */ + *linkp = link->next; + kfree(info); + +} /* elsa_cs_detach */ + +/*====================================================================== + + elsa_cs_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. + +======================================================================*/ +static int get_tuple(client_handle_t handle, tuple_t *tuple, + cisparse_t *parse) +{ + int i = pcmcia_get_tuple_data(handle, tuple); + if (i != CS_SUCCESS) return i; + return pcmcia_parse_tuple(handle, tuple, parse); +} + +static int first_tuple(client_handle_t handle, tuple_t *tuple, + cisparse_t *parse) +{ + int i = pcmcia_get_first_tuple(handle, tuple); + if (i != CS_SUCCESS) return i; + return get_tuple(handle, tuple, parse); +} + +static int next_tuple(client_handle_t handle, tuple_t *tuple, + cisparse_t *parse) +{ + int i = pcmcia_get_next_tuple(handle, tuple); + if (i != CS_SUCCESS) return i; + return get_tuple(handle, tuple, parse); +} + +static void elsa_cs_config(dev_link_t *link) +{ + client_handle_t handle; + tuple_t tuple; + cisparse_t parse; + local_info_t *dev; + int i, j, last_fn; + u_short buf[128]; + cistpl_cftable_entry_t *cf = &parse.cftable_entry; + IsdnCard_t icard; + + DEBUG(0, "elsa_config(0x%p)\n", link); + handle = link->handle; + dev = link->priv; + + /* + This reads the card's CONFIG tuple to find its configuration + registers. + */ + tuple.DesiredTuple = CISTPL_CONFIG; + tuple.TupleData = (cisdata_t *)buf; + tuple.TupleDataMax = 255; + tuple.TupleOffset = 0; + tuple.Attributes = 0; + i = first_tuple(handle, &tuple, &parse); + if (i != CS_SUCCESS) { + last_fn = ParseTuple; + goto cs_failed; + } + link->conf.ConfigBase = parse.config.base; + link->conf.Present = parse.config.rmask[0]; + + /* Configure card */ + link->state |= DEV_CONFIG; + + tuple.TupleData = (cisdata_t *)buf; + tuple.TupleOffset = 0; tuple.TupleDataMax = 255; + tuple.Attributes = 0; + tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY; + i = first_tuple(handle, &tuple, &parse); + while (i == CS_SUCCESS) { + if ( (cf->io.nwin > 0) && cf->io.win[0].base) { + printk(KERN_INFO "(elsa_cs: looks like the 96 model)\n"); + link->conf.ConfigIndex = cf->index; + link->io.BasePort1 = cf->io.win[0].base; + i = pcmcia_request_io(link->handle, &link->io); + if (i == CS_SUCCESS) break; + } else { + printk(KERN_INFO "(elsa_cs: looks like the 97 model)\n"); + link->conf.ConfigIndex = cf->index; + for (i = 0, j = 0x2f0; j > 0x100; j -= 0x10) { + link->io.BasePort1 = j; + i = pcmcia_request_io(link->handle, &link->io); + if (i == CS_SUCCESS) break; + } + break; + } + i = next_tuple(handle, &tuple, &parse); + } + + if (i != CS_SUCCESS) { + last_fn = RequestIO; + goto cs_failed; + } + + i = pcmcia_request_irq(link->handle, &link->irq); + if (i != CS_SUCCESS) { + link->irq.AssignedIRQ = 0; + last_fn = RequestIRQ; + goto cs_failed; + } + + i = pcmcia_request_configuration(link->handle, &link->conf); + if (i != CS_SUCCESS) { + last_fn = RequestConfiguration; + goto cs_failed; + } + + /* At this point, the dev_node_t structure(s) should be + initialized and arranged in a linked list at link->dev. *//* */ + sprintf(dev->node.dev_name, "elsa"); + dev->node.major = dev->node.minor = 0x0; + + 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); + printk("\n"); + + link->state &= ~DEV_CONFIG_PENDING; + + icard.para[0] = link->irq.AssignedIRQ; + icard.para[1] = link->io.BasePort1; + icard.protocol = protocol; + icard.typ = ISDN_CTYPE_ELSA_PCMCIA; + + i = hisax_init_pcmcia(link, &(((local_info_t*)link->priv)->busy), &icard); + if (i < 0) { + printk(KERN_ERR "elsa_cs: failed to initialize Elsa PCMCIA %d at i/o %#x\n", + i, link->io.BasePort1); + elsa_cs_release(link); + } else + ((local_info_t*)link->priv)->cardnr = i; + + return; +cs_failed: + cs_error(link->handle, last_fn, i); + elsa_cs_release(link); +} /* elsa_cs_config */ + +/*====================================================================== + + After a card is removed, elsa_cs_release() will unregister the net + device, and release the PCMCIA configuration. If the device is + still open, this will be postponed until it is closed. + +======================================================================*/ + +static void elsa_cs_release(dev_link_t *link) +{ + local_info_t *local = link->priv; + + DEBUG(0, "elsa_cs_release(0x%p)\n", link); + + if (local) { + if (local->cardnr >= 0) { + /* no unregister function with hisax */ + HiSax_closecard(local->cardnr); + } + } + /* Unlink the device chain */ + link->dev = NULL; + + /* Don't bother checking to see if these succeed or not */ + if (link->win) + pcmcia_release_window(link->win); + pcmcia_release_configuration(link->handle); + pcmcia_release_io(link->handle, &link->io); + pcmcia_release_irq(link->handle, &link->irq); + link->state &= ~DEV_CONFIG; +} /* elsa_cs_release */ + +/*====================================================================== + + The card status event handler. Mostly, this schedules other + stuff to run after an event is received. A CARD_REMOVAL event + also sets some flags to discourage the net drivers from trying + to talk to the card any more. + + When a CARD_REMOVAL event is received, we immediately set a 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 elsa_cs_event(event_t event, int priority, + event_callback_args_t *args) +{ + dev_link_t *link = args->client_data; + local_info_t *dev = link->priv; + + DEBUG(1, "elsa_cs_event(%d)\n", event); + + switch (event) { + case CS_EVENT_CARD_REMOVAL: + link->state &= ~DEV_PRESENT; + if (link->state & DEV_CONFIG) { + ((local_info_t*)link->priv)->busy = 1; + elsa_cs_release(link); + } + break; + case CS_EVENT_CARD_INSERTION: + link->state |= DEV_PRESENT | DEV_CONFIG_PENDING; + elsa_cs_config(link); + break; + case CS_EVENT_PM_SUSPEND: + link->state |= DEV_SUSPEND; + /* Fall through... */ + case CS_EVENT_RESET_PHYSICAL: + /* Mark the device as stopped, to block IO until later */ + dev->busy = 1; + if (link->state & DEV_CONFIG) + pcmcia_release_configuration(link->handle); + break; + case CS_EVENT_PM_RESUME: + link->state &= ~DEV_SUSPEND; + /* Fall through... */ + case CS_EVENT_CARD_RESET: + if (link->state & DEV_CONFIG) + pcmcia_request_configuration(link->handle, &link->conf); + dev->busy = 0; + break; + } + return 0; +} /* elsa_cs_event */ + +static struct pcmcia_driver elsa_cs_driver = { + .owner = THIS_MODULE, + .drv = { + .name = "elsa_cs", + }, + .attach = elsa_cs_attach, + .detach = elsa_cs_detach, +}; + +static int __init init_elsa_cs(void) +{ + return pcmcia_register_driver(&elsa_cs_driver); +} + +static void __exit exit_elsa_cs(void) +{ + pcmcia_unregister_driver(&elsa_cs_driver); + BUG_ON(dev_list != NULL); +} + +module_init(init_elsa_cs); +module_exit(exit_elsa_cs); |