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Diffstat (limited to 'driver/int.c')
| -rw-r--r-- | driver/int.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/driver/int.c b/driver/int.c deleted file mode 100644 index 5dbcb7f..0000000 --- a/driver/int.c +++ /dev/null @@ -1,258 +0,0 @@ -/** - * - * @file int.c - * @author Guillermo Marcus - * @date 2009-04-05 - * @brief Contains the interrupt handler. - * - */ - -/* - * Change History: - * - * $Log: not supported by cvs2svn $ - * Revision 1.7 2008-01-11 10:18:28 marcus - * Modified interrupt mechanism. Added atomic functions and queues, to address race conditions. Removed unused interrupt code. - * - * Revision 1.6 2007-11-04 20:58:22 marcus - * Added interrupt generator acknowledge. - * Fixed wrong operator. - * - * Revision 1.5 2007-10-31 15:42:21 marcus - * Added IG ack for testing, may be removed later. - * - * Revision 1.4 2007-07-17 13:15:56 marcus - * Removed Tasklets. - * Using newest map for the ABB interrupts. - * - * Revision 1.3 2007-07-05 15:30:30 marcus - * Added support for both register maps of the ABB. - * - * Revision 1.2 2007-05-29 07:50:18 marcus - * Split code into 2 files. May get merged in the future again.... - * - * Revision 1.1 2007/03/01 16:57:43 marcus - * Divided driver file to ease the interrupt hooks for the user of the driver. - * Modified Makefile accordingly. - * - */ - -#include <linux/version.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/list.h> -#include <linux/interrupt.h> -#include <linux/pci.h> -#include <linux/cdev.h> -#include <linux/wait.h> -#include <linux/sched.h> -#include <stdbool.h> - -#include "config.h" - -#include "compat.h" - -#include "pciDriver.h" - -#include "common.h" - -#include "int.h" - -/* - * The ID between IRQ_SOURCE in irq_outstanding and the actual source is arbitrary. - * Therefore, be careful when communicating with multiple implementations. - */ - -/* IRQ_SOURCES */ -#define ABB_IRQ_CH0 0 -#define ABB_IRQ_CH1 1 -#define ABB_IRQ_IG 2 - -/* See ABB user’s guide, register definitions (3.1) */ -#define ABB_INT_ENABLE (0x0010 >> 2) -#define ABB_INT_STAT (0x0008 >> 2) - -#define ABB_INT_CH1_TIMEOUT (1 << 4) -#define ABB_INT_CH0_TIMEOUT (1 << 5) -#define ABB_INT_IG (1 << 2) -#define ABB_INT_CH0 (1 << 1) /* downstream */ -#define ABB_INT_CH1 (1) /* upstream */ - -#define ABB_CH0_CTRL (108 >> 2) -#define ABB_CH1_CTRL (72 >> 2) -#define ABB_CH_RESET (0x0201000A) -#define ABB_IG_CTRL (0x0080 >> 2) -#define ABB_IG_ACK (0x00F0) - -/** - * - * If IRQ-handling is enabled, this function will be called from pcidriver_probe - * to initialize the IRQ handling (maps the BARs) - * - */ -int pcidriver_probe_irq(pcidriver_privdata_t *privdata) -{ - unsigned char int_pin, int_line; - unsigned long bar_addr, bar_len, bar_flags; - int i; - int err; - - for (i = 0; i < 6; i++) - privdata->bars_kmapped[i] = NULL; - - for (i = 0; i < 6; i++) { - bar_addr = pci_resource_start(privdata->pdev, i); - bar_len = pci_resource_len(privdata->pdev, i); - bar_flags = pci_resource_flags(privdata->pdev, i); - - /* check if it is a valid BAR, skip if not */ - if ((bar_addr == 0) || (bar_len == 0)) - continue; - - /* Skip IO regions (map only mem regions) */ - if (bar_flags & IORESOURCE_IO) - continue; - - /* Check if the region is available */ - if ((err = pci_request_region(privdata->pdev, i, NULL)) != 0) { - mod_info( "Failed to request BAR memory region.\n" ); - return err; - } - - /* Map it into kernel space. */ - /* For x86 this is just a dereference of the pointer, but that is - * not portable. So we need to do the portable way. Thanks Joern! - */ - - /* respect the cacheable-bility of the region */ - if (bar_flags & IORESOURCE_PREFETCH) - privdata->bars_kmapped[i] = ioremap(bar_addr, bar_len); - else - privdata->bars_kmapped[i] = ioremap_nocache(bar_addr, bar_len); - - /* check for error */ - if (privdata->bars_kmapped[i] == NULL) { - mod_info( "Failed to remap BAR%d into kernel space.\n", i ); - return -EIO; - } - } - - /* Initialize the interrupt handler for this device */ - /* Initialize the wait queues */ - for (i = 0; i < PCIDRIVER_INT_MAXSOURCES; i++) { - init_waitqueue_head(&(privdata->irq_queues[i])); - atomic_set(&(privdata->irq_outstanding[i]), 0); - } - - /* Initialize the irq config */ - if ((err = pci_read_config_byte(privdata->pdev, PCI_INTERRUPT_PIN, &int_pin)) != 0) { - /* continue without interrupts */ - int_pin = 0; - mod_info("Error getting the interrupt pin. Disabling interrupts for this device\n"); - } - - /* Disable interrupts and activate them if everything can be set up properly */ - privdata->irq_enabled = 0; - - if (int_pin == 0) - return 0; - - if ((err = pci_read_config_byte(privdata->pdev, PCI_INTERRUPT_LINE, &int_line)) != 0) { - mod_info("Error getting the interrupt line. Disabling interrupts for this device\n"); - return 0; - } - - /* Enable interrupts using MSI mode */ - if (!pci_enable_msi(privdata->pdev)) - privdata->msi_mode = 1; - - /* register interrupt handler */ - if ((err = request_irq(privdata->pdev->irq, pcidriver_irq_handler, MODNAME, privdata)) != 0) { - mod_info("Error registering the interrupt handler. Disabling interrupts for this device\n"); - return 0; - } - - privdata->irq_enabled = 1; - mod_info("Registered Interrupt Handler at pin %i, line %i, IRQ %i\n", int_pin, int_line, privdata->pdev->irq ); - - return 0; -} - -/** - * - * Frees/cleans up the data structures, called from pcidriver_remove() - * - */ -void pcidriver_remove_irq(pcidriver_privdata_t *privdata) -{ - /* Release the IRQ handler */ - if (privdata->irq_enabled != 0) - free_irq(privdata->pdev->irq, privdata); - - if (privdata->msi_mode) { - pci_disable_msi(privdata->pdev); - privdata->msi_mode = 0; - } - - pcidriver_irq_unmap_bars(privdata); -} - -/** - * - * Unmaps the BARs and releases them - * - */ -void pcidriver_irq_unmap_bars(pcidriver_privdata_t *privdata) -{ - int i; - - for (i = 0; i < 6; i++) { - if (privdata->bars_kmapped[i] == NULL) - continue; - - iounmap((void*)privdata->bars_kmapped[i]); - pci_release_region(privdata->pdev, i); - } -} - -/** - * - * Acknowledges the receival of an interrupt to the card. - * - * @returns true if the card was acknowledget - * @returns false if the interrupt was not for one of our cards - * - * @see check_acknowlegde_channel - * - */ -static bool pcidriver_irq_acknowledge(pcidriver_privdata_t *privdata) -{ - int channel = 0; -// volatile unsigned int *bar; -// bar = privdata->bars_kmapped[0]; -// mod_info_dbg("interrupt registers. ISR: %x, IER: %x\n", bar[ABB_INT_STAT], bar[ABB_INT_ENABLE]); - - atomic_inc(&(privdata->irq_outstanding[channel])); - wake_up_interruptible(&(privdata->irq_queues[channel])); - - return true; -} - -/** - * - * Handles IRQs. At the moment, this acknowledges the card that this IRQ - * was received and then increases the driver's IRQ counter. - * - * @see pcidriver_irq_acknowledge - * - */ -IRQ_HANDLER_FUNC(pcidriver_irq_handler) -{ - pcidriver_privdata_t *privdata = (pcidriver_privdata_t *)dev_id; - - if (!pcidriver_irq_acknowledge(privdata)) - return IRQ_NONE; - - privdata->irq_count++; - return IRQ_HANDLED; -} |