diff options
Diffstat (limited to 'drivers/staging/dgap/dgap_driver.c')
| -rw-r--r-- | drivers/staging/dgap/dgap_driver.c | 1030 |
1 files changed, 0 insertions, 1030 deletions
diff --git a/drivers/staging/dgap/dgap_driver.c b/drivers/staging/dgap/dgap_driver.c deleted file mode 100644 index 089d017fc291..000000000000 --- a/drivers/staging/dgap/dgap_driver.c +++ /dev/null @@ -1,1030 +0,0 @@ -/* - * Copyright 2003 Digi International (www.digi.com) - * Scott H Kilau <Scott_Kilau at digi dot 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, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the - * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR - * PURPOSE. See the GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - * - * - * NOTE TO LINUX KERNEL HACKERS: DO NOT REFORMAT THIS CODE! - * - * This is shared code between Digi's CVS archive and the - * Linux Kernel sources. - * Changing the source just for reformatting needlessly breaks - * our CVS diff history. - * - * Send any bug fixes/changes to: Eng.Linux at digi dot com. - * Thank you. - * - * $Id: dgap_driver.c,v 1.3 2011/06/21 10:35:16 markh Exp $ - */ - - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/delay.h> /* For udelay */ -#include <linux/slab.h> -#include <asm/uaccess.h> /* For copy_from_user/copy_to_user */ -#include <linux/sched.h> - -#include "dgap_driver.h" -#include "dgap_pci.h" -#include "dgap_fep5.h" -#include "dgap_tty.h" -#include "dgap_conf.h" -#include "dgap_parse.h" -#include "dgap_trace.h" -#include "dgap_sysfs.h" - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Digi International, http://www.digi.com"); -MODULE_DESCRIPTION("Driver for the Digi International EPCA PCI based product line"); -MODULE_SUPPORTED_DEVICE("dgap"); - -/* - * insmod command line overrideable parameters - * - * NOTE: we use a set of macros to create the variables, which allows - * us to specify the variable type, name, initial value, and description. - */ -PARM_INT(debug, 0x00, 0644, "Driver debugging level"); -PARM_INT(rawreadok, 1, 0644, "Bypass flip buffers on input"); -PARM_INT(trcbuf_size, 0x100000, 0644, "Debugging trace buffer size."); - - -/************************************************************************** - * - * protos for this file - * - */ - -static int dgap_start(void); -static void dgap_init_globals(void); -static int dgap_found_board(struct pci_dev *pdev, int id); -static void dgap_cleanup_board(struct board_t *brd); -static void dgap_poll_handler(ulong dummy); -static int dgap_init_pci(void); -static int dgap_init_one(struct pci_dev *pdev, const struct pci_device_id *ent); -static void dgap_remove_one(struct pci_dev *dev); -static int dgap_probe1(struct pci_dev *pdev, int card_type); -static void dgap_mbuf(struct board_t *brd, const char *fmt, ...); -static int dgap_do_remap(struct board_t *brd); -static irqreturn_t dgap_intr(int irq, void *voidbrd); - -/* Driver load/unload functions */ -int dgap_init_module(void); -void dgap_cleanup_module(void); - -module_init(dgap_init_module); -module_exit(dgap_cleanup_module); - - -/* - * File operations permitted on Control/Management major. - */ -static struct file_operations DgapBoardFops = -{ - .owner = THIS_MODULE, -}; - - -/* - * Globals - */ -uint dgap_NumBoards; -struct board_t *dgap_Board[MAXBOARDS]; -DEFINE_SPINLOCK(dgap_global_lock); -ulong dgap_poll_counter; -char *dgap_config_buf; -int dgap_driver_state = DRIVER_INITIALIZED; -DEFINE_SPINLOCK(dgap_dl_lock); -wait_queue_head_t dgap_dl_wait; -int dgap_dl_action; -int dgap_poll_tick = 20; /* Poll interval - 20 ms */ - -/* - * Static vars. - */ -static int dgap_Major_Control_Registered = FALSE; -static uint dgap_driver_start = FALSE; - -static struct class * dgap_class; - -/* - * Poller stuff - */ -static DEFINE_SPINLOCK(dgap_poll_lock); /* Poll scheduling lock */ -static ulong dgap_poll_time; /* Time of next poll */ -static uint dgap_poll_stop; /* Used to tell poller to stop */ -static struct timer_list dgap_poll_timer; - - -static struct pci_device_id dgap_pci_tbl[] = { - { DIGI_VID, PCI_DEVICE_XEM_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, - { DIGI_VID, PCI_DEVICE_CX_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1 }, - { DIGI_VID, PCI_DEVICE_CX_IBM_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 2 }, - { DIGI_VID, PCI_DEVICE_EPCJ_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 3 }, - { DIGI_VID, PCI_DEVICE_920_2_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 }, - { DIGI_VID, PCI_DEVICE_920_4_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 5 }, - { DIGI_VID, PCI_DEVICE_920_8_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 6 }, - { DIGI_VID, PCI_DEVICE_XR_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 7 }, - { DIGI_VID, PCI_DEVICE_XRJ_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 8 }, - { DIGI_VID, PCI_DEVICE_XR_422_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 9 }, - { DIGI_VID, PCI_DEVICE_XR_IBM_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 10 }, - { DIGI_VID, PCI_DEVICE_XR_SAIP_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 11 }, - { DIGI_VID, PCI_DEVICE_XR_BULL_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 12 }, - { DIGI_VID, PCI_DEVICE_920_8_HP_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 13 }, - { DIGI_VID, PCI_DEVICE_XEM_HP_DID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 14 }, - {0,} /* 0 terminated list. */ -}; -MODULE_DEVICE_TABLE(pci, dgap_pci_tbl); - - -/* - * A generic list of Product names, PCI Vendor ID, and PCI Device ID. - */ -struct board_id { - uint config_type; - uchar *name; - uint maxports; - uint dpatype; -}; - -static struct board_id dgap_Ids[] = -{ - { PPCM, PCI_DEVICE_XEM_NAME, 64, (T_PCXM | T_PCLITE | T_PCIBUS) }, - { PCX, PCI_DEVICE_CX_NAME, 128, (T_CX | T_PCIBUS) }, - { PCX, PCI_DEVICE_CX_IBM_NAME, 128, (T_CX | T_PCIBUS) }, - { PEPC, PCI_DEVICE_EPCJ_NAME, 224, (T_EPC | T_PCIBUS) }, - { APORT2_920P, PCI_DEVICE_920_2_NAME, 2, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { APORT4_920P, PCI_DEVICE_920_4_NAME, 4, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { APORT8_920P, PCI_DEVICE_920_8_NAME, 8, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { PAPORT8, PCI_DEVICE_XR_NAME, 8, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { PAPORT8, PCI_DEVICE_XRJ_NAME, 8, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { PAPORT8, PCI_DEVICE_XR_422_NAME, 8, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { PAPORT8, PCI_DEVICE_XR_IBM_NAME, 8, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { PAPORT8, PCI_DEVICE_XR_SAIP_NAME, 8, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { PAPORT8, PCI_DEVICE_XR_BULL_NAME, 8, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { APORT8_920P, PCI_DEVICE_920_8_HP_NAME, 8, (T_PCXR | T_PCLITE | T_PCIBUS) }, - { PPCM, PCI_DEVICE_XEM_HP_NAME, 64, (T_PCXM | T_PCLITE | T_PCIBUS) }, - {0,} /* 0 terminated list. */ -}; - -static struct pci_driver dgap_driver = { - .name = "dgap", - .probe = dgap_init_one, - .id_table = dgap_pci_tbl, - .remove = dgap_remove_one, -}; - - -char *dgap_state_text[] = { - "Board Failed", - "Configuration for board not found.\n\t\t\tRun mpi to configure board.", - "Board Found", - "Need Reset", - "Finished Reset", - "Need Config", - "Finished Config", - "Need Device Creation", - "Requested Device Creation", - "Finished Device Creation", - "Need BIOS Load", - "Requested BIOS", - "Doing BIOS Load", - "Finished BIOS Load", - "Need FEP Load", - "Requested FEP", - "Doing FEP Load", - "Finished FEP Load", - "Requested PROC creation", - "Finished PROC creation", - "Board READY", -}; - -char *dgap_driver_state_text[] = { - "Driver Initialized", - "Driver needs configuration load.", - "Driver requested configuration from download daemon.", - "Driver Ready." -}; - - - -/************************************************************************ - * - * Driver load/unload functions - * - ************************************************************************/ - -/* - * init_module() - * - * Module load. This is where it all starts. - */ -int dgap_init_module(void) -{ - int rc = 0; - - APR(("%s, Digi International Part Number %s\n", DG_NAME, DG_PART)); - - /* - * Initialize global stuff - */ - rc = dgap_start(); - - if (rc < 0) { - return(rc); - } - - /* - * Find and configure all the cards - */ - rc = dgap_init_pci(); - - /* - * If something went wrong in the scan, bail out of driver. - */ - if (rc < 0) { - /* Only unregister the pci driver if it was actually registered. */ - if (dgap_NumBoards) - pci_unregister_driver(&dgap_driver); - else - printk("WARNING: dgap driver load failed. No DGAP boards found.\n"); - - dgap_cleanup_module(); - } - else { - dgap_create_driver_sysfiles(&dgap_driver); - } - - DPR_INIT(("Finished init_module. Returning %d\n", rc)); - return (rc); -} - - -/* - * Start of driver. - */ -static int dgap_start(void) -{ - int rc = 0; - unsigned long flags; - - if (dgap_driver_start == FALSE) { - - dgap_driver_start = TRUE; - - /* make sure that the globals are init'd before we do anything else */ - dgap_init_globals(); - - dgap_NumBoards = 0; - - APR(("For the tools package or updated drivers please visit http://www.digi.com\n")); - - /* - * Register our base character device into the kernel. - * This allows the download daemon to connect to the downld device - * before any of the boards are init'ed. - */ - if (!dgap_Major_Control_Registered) { - /* - * Register management/dpa devices - */ - rc = register_chrdev(DIGI_DGAP_MAJOR, "dgap", &DgapBoardFops); - if (rc < 0) { - APR(("Can't register dgap driver device (%d)\n", rc)); - return (rc); - } - - dgap_class = class_create(THIS_MODULE, "dgap_mgmt"); - device_create(dgap_class, NULL, - MKDEV(DIGI_DGAP_MAJOR, 0), - NULL, "dgap_mgmt"); - device_create(dgap_class, NULL, - MKDEV(DIGI_DGAP_MAJOR, 1), - NULL, "dgap_downld"); - dgap_Major_Control_Registered = TRUE; - } - - /* - * Init any global tty stuff. - */ - rc = dgap_tty_preinit(); - - if (rc < 0) { - APR(("tty preinit - not enough memory (%d)\n", rc)); - return(rc); - } - - /* Start the poller */ - DGAP_LOCK(dgap_poll_lock, flags); - init_timer(&dgap_poll_timer); - dgap_poll_timer.function = dgap_poll_handler; - dgap_poll_timer.data = 0; - dgap_poll_time = jiffies + dgap_jiffies_from_ms(dgap_poll_tick); - dgap_poll_timer.expires = dgap_poll_time; - DGAP_UNLOCK(dgap_poll_lock, flags); - - add_timer(&dgap_poll_timer); - - dgap_driver_state = DRIVER_NEED_CONFIG_LOAD; - } - - return (rc); -} - - -/* - * Register pci driver, and return how many boards we have. - */ -static int dgap_init_pci(void) -{ - return pci_register_driver(&dgap_driver); -} - - -/* returns count (>= 0), or negative on error */ -static int dgap_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) -{ - int rc; - - /* wake up and enable device */ - rc = pci_enable_device(pdev); - - if (rc < 0) { - rc = -EIO; - } else { - rc = dgap_probe1(pdev, ent->driver_data); - if (rc == 0) { - dgap_NumBoards++; - DPR_INIT(("Incrementing numboards to %d\n", dgap_NumBoards)); - } - } - return rc; -} - - -static int dgap_probe1(struct pci_dev *pdev, int card_type) -{ - return dgap_found_board(pdev, card_type); -} - - -static void dgap_remove_one(struct pci_dev *dev) -{ - /* Do Nothing */ -} - - -/* - * dgap_cleanup_module() - * - * Module unload. This is where it all ends. - */ -void dgap_cleanup_module(void) -{ - int i; - ulong lock_flags; - - DGAP_LOCK(dgap_poll_lock, lock_flags); - dgap_poll_stop = 1; - DGAP_UNLOCK(dgap_poll_lock, lock_flags); - - /* Turn off poller right away. */ - del_timer_sync( &dgap_poll_timer); - - dgap_remove_driver_sysfiles(&dgap_driver); - - - if (dgap_Major_Control_Registered) { - device_destroy(dgap_class, MKDEV(DIGI_DGAP_MAJOR, 0)); - device_destroy(dgap_class, MKDEV(DIGI_DGAP_MAJOR, 1)); - class_destroy(dgap_class); - unregister_chrdev(DIGI_DGAP_MAJOR, "dgap"); - } - - kfree(dgap_config_buf); - - for (i = 0; i < dgap_NumBoards; ++i) { - dgap_remove_ports_sysfiles(dgap_Board[i]); - dgap_tty_uninit(dgap_Board[i]); - dgap_cleanup_board(dgap_Board[i]); - } - - dgap_tty_post_uninit(); - -#if defined(DGAP_TRACER) - /* last thing, make sure we release the tracebuffer */ - dgap_tracer_free(); -#endif - if (dgap_NumBoards) - pci_unregister_driver(&dgap_driver); -} - - -/* - * dgap_cleanup_board() - * - * Free all the memory associated with a board - */ -static void dgap_cleanup_board(struct board_t *brd) -{ - int i = 0; - - if(!brd || brd->magic != DGAP_BOARD_MAGIC) - return; - - if (brd->intr_used && brd->irq) - free_irq(brd->irq, brd); - - tasklet_kill(&brd->helper_tasklet); - - if (brd->re_map_port) { - release_mem_region(brd->membase + 0x200000, 0x200000); - iounmap(brd->re_map_port); - brd->re_map_port = NULL; - } - - if (brd->re_map_membase) { - release_mem_region(brd->membase, 0x200000); - iounmap(brd->re_map_membase); - brd->re_map_membase = NULL; - } - - if (brd->msgbuf_head) { - unsigned long flags; - - DGAP_LOCK(dgap_global_lock, flags); - brd->msgbuf = NULL; - printk("%s", brd->msgbuf_head); - kfree(brd->msgbuf_head); - brd->msgbuf_head = NULL; - DGAP_UNLOCK(dgap_global_lock, flags); - } - - /* Free all allocated channels structs */ - for (i = 0; i < MAXPORTS ; i++) { - if (brd->channels[i]) { - kfree(brd->channels[i]); - brd->channels[i] = NULL; - } - } - - kfree(brd->flipbuf); - kfree(brd->flipflagbuf); - - dgap_Board[brd->boardnum] = NULL; - - kfree(brd); -} - - -/* - * dgap_found_board() - * - * A board has been found, init it. - */ -static int dgap_found_board(struct pci_dev *pdev, int id) -{ - struct board_t *brd; - unsigned int pci_irq; - int i = 0; - unsigned long flags; - - /* get the board structure and prep it */ - brd = dgap_Board[dgap_NumBoards] = - (struct board_t *) kzalloc(sizeof(struct board_t), GFP_KERNEL); - if (!brd) { - APR(("memory allocation for board structure failed\n")); - return(-ENOMEM); - } - - /* make a temporary message buffer for the boot messages */ - brd->msgbuf = brd->msgbuf_head = - (char *) kzalloc(sizeof(char) * 8192, GFP_KERNEL); - if(!brd->msgbuf) { - kfree(brd); - APR(("memory allocation for board msgbuf failed\n")); - return(-ENOMEM); - } - - /* store the info for the board we've found */ - brd->magic = DGAP_BOARD_MAGIC; - brd->boardnum = dgap_NumBoards; - brd->firstminor = 0; - brd->vendor = dgap_pci_tbl[id].vendor; - brd->device = dgap_pci_tbl[id].device; - brd->pdev = pdev; - brd->pci_bus = pdev->bus->number; - brd->pci_slot = PCI_SLOT(pdev->devfn); - brd->name = dgap_Ids[id].name; - brd->maxports = dgap_Ids[id].maxports; - brd->type = dgap_Ids[id].config_type; - brd->dpatype = dgap_Ids[id].dpatype; - brd->dpastatus = BD_NOFEP; - init_waitqueue_head(&brd->state_wait); - - DGAP_SPINLOCK_INIT(brd->bd_lock); - - brd->state = BOARD_FOUND; - brd->runwait = 0; - brd->inhibit_poller = FALSE; - brd->wait_for_bios = 0; - brd->wait_for_fep = 0; - - for (i = 0; i < MAXPORTS; i++) { - brd->channels[i] = NULL; - } - - /* store which card & revision we have */ - pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &brd->subvendor); - pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &brd->subdevice); - pci_read_config_byte(pdev, PCI_REVISION_ID, &brd->rev); - - pci_irq = pdev->irq; - brd->irq = pci_irq; - - /* get the PCI Base Address Registers */ - - /* Xr Jupiter and EPC use BAR 2 */ - if (brd->device == PCI_DEVICE_XRJ_DID || brd->device == PCI_DEVICE_EPCJ_DID) { - brd->membase = pci_resource_start(pdev, 2); - brd->membase_end = pci_resource_end(pdev, 2); - } - /* Everyone else uses BAR 0 */ - else { - brd->membase = pci_resource_start(pdev, 0); - brd->membase_end = pci_resource_end(pdev, 0); - } - - if (!brd->membase) { - APR(("card has no PCI IO resources, failing board.\n")); - return -ENODEV; - } - - if (brd->membase & 1) - brd->membase &= ~3; - else - brd->membase &= ~15; - - /* - * On the PCI boards, there is no IO space allocated - * The I/O registers will be in the first 3 bytes of the - * upper 2MB of the 4MB memory space. The board memory - * will be mapped into the low 2MB of the 4MB memory space - */ - brd->port = brd->membase + PCI_IO_OFFSET; - brd->port_end = brd->port + PCI_IO_SIZE; - - - /* - * Special initialization for non-PLX boards - */ - if (brd->device != PCI_DEVICE_XRJ_DID && brd->device != PCI_DEVICE_EPCJ_DID) { - unsigned short cmd; - - pci_write_config_byte(pdev, 0x40, 0); - pci_write_config_byte(pdev, 0x46, 0); - - /* Limit burst length to 2 doubleword transactions */ - pci_write_config_byte(pdev, 0x42, 1); - - /* - * Enable IO and mem if not already done. - * This was needed for support on Itanium. - */ - pci_read_config_word(pdev, PCI_COMMAND, &cmd); - cmd |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY); - pci_write_config_word(pdev, PCI_COMMAND, cmd); - } - - /* init our poll helper tasklet */ - tasklet_init(&brd->helper_tasklet, dgap_poll_tasklet, (unsigned long) brd); - - /* Log the information about the board */ - dgap_mbuf(brd, DRVSTR": board %d: %s (rev %d), irq %d\n", - dgap_NumBoards, brd->name, brd->rev, brd->irq); - - DPR_INIT(("dgap_scan(%d) - printing out the msgbuf\n", i)); - DGAP_LOCK(dgap_global_lock, flags); - brd->msgbuf = NULL; - printk("%s", brd->msgbuf_head); - kfree(brd->msgbuf_head); - brd->msgbuf_head = NULL; - DGAP_UNLOCK(dgap_global_lock, flags); - - i = dgap_do_remap(brd); - if (i) - brd->state = BOARD_FAILED; - else - brd->state = NEED_RESET; - - return(0); -} - - -int dgap_finalize_board_init(struct board_t *brd) { - - int rc; - - DPR_INIT(("dgap_finalize_board_init() - start\n")); - - if (!brd || brd->magic != DGAP_BOARD_MAGIC) - return(-ENODEV); - - DPR_INIT(("dgap_finalize_board_init() - start #2\n")); - - brd->use_interrupts = dgap_config_get_useintr(brd); - - /* - * Set up our interrupt handler if we are set to do interrupts. - */ - if (brd->use_interrupts && brd->irq) { - - rc = request_irq(brd->irq, dgap_intr, IRQF_SHARED, "DGAP", brd); - - if (rc) { - dgap_mbuf(brd, DRVSTR": Failed to hook IRQ %d. Board will work in poll mode.\n", - brd->irq); - brd->intr_used = 0; - } - else - brd->intr_used = 1; - } else { - brd->intr_used = 0; - } - - return(0); -} - - -/* - * Remap PCI memory. - */ -static int dgap_do_remap(struct board_t *brd) -{ - if (!brd || brd->magic != DGAP_BOARD_MAGIC) - return -ENXIO; - - if (!request_mem_region(brd->membase, 0x200000, "dgap")) { - APR(("dgap: mem_region %lx already in use.\n", brd->membase)); - return -ENOMEM; - } - - if (!request_mem_region(brd->membase + PCI_IO_OFFSET, 0x200000, "dgap")) { - APR(("dgap: mem_region IO %lx already in use.\n", - brd->membase + PCI_IO_OFFSET)); - release_mem_region(brd->membase, 0x200000); - return -ENOMEM; - } - - brd->re_map_membase = ioremap(brd->membase, 0x200000); - if (!brd->re_map_membase) { - APR(("dgap: ioremap mem %lx cannot be mapped.\n", brd->membase)); - release_mem_region(brd->membase, 0x200000); - release_mem_region(brd->membase + PCI_IO_OFFSET, 0x200000); - return -ENOMEM; - } - - brd->re_map_port = ioremap((brd->membase + PCI_IO_OFFSET), 0x200000); - if (!brd->re_map_port) { - release_mem_region(brd->membase, 0x200000); - release_mem_region(brd->membase + PCI_IO_OFFSET, 0x200000); - iounmap(brd->re_map_membase); - APR(("dgap: ioremap IO mem %lx cannot be mapped.\n", - brd->membase + PCI_IO_OFFSET)); - return -ENOMEM; - } - - DPR_INIT(("remapped io: 0x%p remapped mem: 0x%p\n", - brd->re_map_port, brd->re_map_membase)); - return 0; -} - - -/***************************************************************************** -* -* Function: -* -* dgap_poll_handler -* -* Author: -* -* Scott H Kilau -* -* Parameters: -* -* dummy -- ignored -* -* Return Values: -* -* none -* -* Description: -* -* As each timer expires, it determines (a) whether the "transmit" -* waiter needs to be woken up, and (b) whether the poller needs to -* be rescheduled. -* -******************************************************************************/ - -static void dgap_poll_handler(ulong dummy) -{ - int i; - struct board_t *brd; - unsigned long lock_flags; - unsigned long lock_flags2; - ulong new_time; - - dgap_poll_counter++; - - - /* - * If driver needs the config file still, - * keep trying to wake up the downloader to - * send us the file. - */ - if (dgap_driver_state == DRIVER_NEED_CONFIG_LOAD) { - /* - * Signal downloader, its got some work to do. - */ - DGAP_LOCK(dgap_dl_lock, lock_flags2); - if (dgap_dl_action != 1) { - dgap_dl_action = 1; - wake_up_interruptible(&dgap_dl_wait); - } - DGAP_UNLOCK(dgap_dl_lock, lock_flags2); - goto schedule_poller; - } - /* - * Do not start the board state machine until - * driver tells us its up and running, and has - * everything it needs. - */ - else if (dgap_driver_state != DRIVER_READY) { - goto schedule_poller; - } - - /* - * If we have just 1 board, or the system is not SMP, - * then use the typical old style poller. - * Otherwise, use our new tasklet based poller, which should - * speed things up for multiple boards. - */ - if ( (dgap_NumBoards == 1) || (num_online_cpus() <= 1) ) { - for (i = 0; i < dgap_NumBoards; i++) { - - brd = dgap_Board[i]; - - if (brd->state == BOARD_FAILED) { - continue; - } - if (!brd->intr_running) { - /* Call the real board poller directly */ - dgap_poll_tasklet((unsigned long) brd); - } - } - } - else { - /* Go thru each board, kicking off a tasklet for each if needed */ - for (i = 0; i < dgap_NumBoards; i++) { - brd = dgap_Board[i]; - - /* - * Attempt to grab the board lock. - * - * If we can't get it, no big deal, the next poll will get it. - * Basically, I just really don't want to spin in here, because I want - * to kick off my tasklets as fast as I can, and then get out the poller. - */ - if (!spin_trylock(&brd->bd_lock)) { - continue; - } - - /* If board is in a failed state, don't bother scheduling a tasklet */ - if (brd->state == BOARD_FAILED) { - spin_unlock(&brd->bd_lock); - continue; - } - - /* Schedule a poll helper task */ - if (!brd->intr_running) { - tasklet_schedule(&brd->helper_tasklet); - } - - /* - * Can't do DGAP_UNLOCK here, as we don't have - * lock_flags because we did a trylock above. - */ - spin_unlock(&brd->bd_lock); - } - } - -schedule_poller: - - /* - * Schedule ourself back at the nominal wakeup interval. - */ - DGAP_LOCK(dgap_poll_lock, lock_flags ); - dgap_poll_time += dgap_jiffies_from_ms(dgap_poll_tick); - - new_time = dgap_poll_time - jiffies; - - if ((ulong) new_time >= 2 * dgap_poll_tick) { - dgap_poll_time = jiffies + dgap_jiffies_from_ms(dgap_poll_tick); - } - - dgap_poll_timer.function = dgap_poll_handler; - dgap_poll_timer.data = 0; - dgap_poll_timer.expires = dgap_poll_time; - DGAP_UNLOCK(dgap_poll_lock, lock_flags ); - - if (!dgap_poll_stop) - add_timer(&dgap_poll_timer); -} - - - - -/* - * dgap_intr() - * - * Driver interrupt handler. - */ -static irqreturn_t dgap_intr(int irq, void *voidbrd) -{ - struct board_t *brd = (struct board_t *) voidbrd; - - if (!brd) { - APR(("Received interrupt (%d) with null board associated\n", irq)); - return IRQ_NONE; - } - - /* - * Check to make sure its for us. - */ - if (brd->magic != DGAP_BOARD_MAGIC) { - APR(("Received interrupt (%d) with a board pointer that wasn't ours!\n", irq)); - return IRQ_NONE; - } - - brd->intr_count++; - - /* - * Schedule tasklet to run at a better time. - */ - tasklet_schedule(&brd->helper_tasklet); - return IRQ_HANDLED; -} - - -/* - * dgap_init_globals() - * - * This is where we initialize the globals from the static insmod - * configuration variables. These are declared near the head of - * this file. - */ -static void dgap_init_globals(void) -{ - int i = 0; - - dgap_rawreadok = rawreadok; - dgap_trcbuf_size = trcbuf_size; - dgap_debug = debug; - - for (i = 0; i < MAXBOARDS; i++) { - dgap_Board[i] = NULL; - } - - init_timer( &dgap_poll_timer ); - - init_waitqueue_head(&dgap_dl_wait); - dgap_dl_action = 0; -} - - -/************************************************************************ - * - * Utility functions - * - ************************************************************************/ - - -/* - * dgap_mbuf() - * - * Used to print to the message buffer during board init. - */ -static void dgap_mbuf(struct board_t *brd, const char *fmt, ...) { - va_list ap; - char buf[1024]; - int i; - unsigned long flags; - size_t length; - - DGAP_LOCK(dgap_global_lock, flags); - - /* Format buf using fmt and arguments contained in ap. */ - va_start(ap, fmt); - i = vsnprintf(buf, sizeof(buf), fmt, ap); - va_end(ap); - - DPR((buf)); - - if (!brd || !brd->msgbuf) { - printk("%s", buf); - DGAP_UNLOCK(dgap_global_lock, flags); - return; - } - - length = strlen(buf) + 1; - if (brd->msgbuf - brd->msgbuf_head < length) - length = brd->msgbuf - brd->msgbuf_head; - memcpy(brd->msgbuf, buf, length); - brd->msgbuf += length; - - DGAP_UNLOCK(dgap_global_lock, flags); -} - - -/* - * dgap_ms_sleep() - * - * Put the driver to sleep for x ms's - * - * Returns 0 if timed out, !0 (showing signal) if interrupted by a signal. - */ -int dgap_ms_sleep(ulong ms) -{ - current->state = TASK_INTERRUPTIBLE; - schedule_timeout((ms * HZ) / 1000); - return (signal_pending(current)); -} - - - -/* - * dgap_ioctl_name() : Returns a text version of each ioctl value. - */ -char *dgap_ioctl_name(int cmd) -{ - switch(cmd) { - - case TCGETA: return("TCGETA"); - case TCGETS: return("TCGETS"); - case TCSETA: return("TCSETA"); - case TCSETS: return("TCSETS"); - case TCSETAW: return("TCSETAW"); - case TCSETSW: return("TCSETSW"); - case TCSETAF: return("TCSETAF"); - case TCSETSF: return("TCSETSF"); - case TCSBRK: return("TCSBRK"); - case TCXONC: return("TCXONC"); - case TCFLSH: return("TCFLSH"); - case TIOCGSID: return("TIOCGSID"); - - case TIOCGETD: return("TIOCGETD"); - case TIOCSETD: return("TIOCSETD"); - case TIOCGWINSZ: return("TIOCGWINSZ"); - case TIOCSWINSZ: return("TIOCSWINSZ"); - - case TIOCMGET: return("TIOCMGET"); - case TIOCMSET: return("TIOCMSET"); - case TIOCMBIS: return("TIOCMBIS"); - case TIOCMBIC: return("TIOCMBIC"); - - /* from digi.h */ - case DIGI_SETA: return("DIGI_SETA"); - case DIGI_SETAW: return("DIGI_SETAW"); - case DIGI_SETAF: return("DIGI_SETAF"); - case DIGI_SETFLOW: return("DIGI_SETFLOW"); - case DIGI_SETAFLOW: return("DIGI_SETAFLOW"); - case DIGI_GETFLOW: return("DIGI_GETFLOW"); - case DIGI_GETAFLOW: return("DIGI_GETAFLOW"); - case DIGI_GETA: return("DIGI_GETA"); - case DIGI_GEDELAY: return("DIGI_GEDELAY"); - case DIGI_SEDELAY: return("DIGI_SEDELAY"); - case DIGI_GETCUSTOMBAUD: return("DIGI_GETCUSTOMBAUD"); - case DIGI_SETCUSTOMBAUD: return("DIGI_SETCUSTOMBAUD"); - case TIOCMODG: return("TIOCMODG"); - case TIOCMODS: return("TIOCMODS"); - case TIOCSDTR: return("TIOCSDTR"); - case TIOCCDTR: return("TIOCCDTR"); - - default: return("unknown"); - } -} |