Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/pci/hotplug/cpci_hotplug_core.c b/drivers/pci/hotplug/cpci_hotplug_core.c
new file mode 100644
index 0000000..ed24360
--- /dev/null
+++ b/drivers/pci/hotplug/cpci_hotplug_core.c
@@ -0,0 +1,792 @@
+/*
+ * CompactPCI Hot Plug Driver
+ *
+ * Copyright (C) 2002 SOMA Networks, Inc.
+ * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2001 IBM Corp.
+ *
+ * All rights reserved.
+ *
+ * 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, GOOD TITLE or
+ * NON INFRINGEMENT. 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.
+ *
+ * Send feedback to <scottm@somanetworks.com>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/smp_lock.h>
+#include <linux/delay.h>
+#include "pci_hotplug.h"
+#include "cpci_hotplug.h"
+
+#define DRIVER_VERSION "0.2"
+#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
+#define DRIVER_DESC "CompactPCI Hot Plug Core"
+
+#define MY_NAME "cpci_hotplug"
+
+#define dbg(format, arg...) \
+ do { \
+ if(cpci_debug) \
+ printk (KERN_DEBUG "%s: " format "\n", \
+ MY_NAME , ## arg); \
+ } while(0)
+#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
+#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
+#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
+
+/* local variables */
+static spinlock_t list_lock;
+static LIST_HEAD(slot_list);
+static int slots;
+int cpci_debug;
+static struct cpci_hp_controller *controller;
+static struct semaphore event_semaphore; /* mutex for process loop (up if something to process) */
+static struct semaphore thread_exit; /* guard ensure thread has exited before calling it quits */
+static int thread_finished = 1;
+
+static int enable_slot(struct hotplug_slot *slot);
+static int disable_slot(struct hotplug_slot *slot);
+static int set_attention_status(struct hotplug_slot *slot, u8 value);
+static int get_power_status(struct hotplug_slot *slot, u8 * value);
+static int get_attention_status(struct hotplug_slot *slot, u8 * value);
+
+static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
+ .owner = THIS_MODULE,
+ .enable_slot = enable_slot,
+ .disable_slot = disable_slot,
+ .set_attention_status = set_attention_status,
+ .get_power_status = get_power_status,
+ .get_attention_status = get_attention_status,
+};
+
+static int
+update_latch_status(struct hotplug_slot *hotplug_slot, u8 value)
+{
+ struct hotplug_slot_info info;
+
+ memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
+ info.latch_status = value;
+ return pci_hp_change_slot_info(hotplug_slot, &info);
+}
+
+static int
+update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value)
+{
+ struct hotplug_slot_info info;
+
+ memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
+ info.adapter_status = value;
+ return pci_hp_change_slot_info(hotplug_slot, &info);
+}
+
+static int
+enable_slot(struct hotplug_slot *hotplug_slot)
+{
+ struct slot *slot = hotplug_slot->private;
+ int retval = 0;
+
+ dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ if(controller->ops->set_power) {
+ retval = controller->ops->set_power(slot, 1);
+ }
+
+ return retval;
+}
+
+static int
+disable_slot(struct hotplug_slot *hotplug_slot)
+{
+ struct slot *slot = hotplug_slot->private;
+ int retval = 0;
+
+ dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
+
+ /* Unconfigure device */
+ dbg("%s - unconfiguring slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ if((retval = cpci_unconfigure_slot(slot))) {
+ err("%s - could not unconfigure slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ return retval;
+ }
+ dbg("%s - finished unconfiguring slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+
+ /* Clear EXT (by setting it) */
+ if(cpci_clear_ext(slot)) {
+ err("%s - could not clear EXT for slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ retval = -ENODEV;
+ }
+ cpci_led_on(slot);
+
+ if(controller->ops->set_power) {
+ retval = controller->ops->set_power(slot, 0);
+ }
+
+ if(update_adapter_status(slot->hotplug_slot, 0)) {
+ warn("failure to update adapter file");
+ }
+
+ slot->extracting = 0;
+
+ return retval;
+}
+
+static u8
+cpci_get_power_status(struct slot *slot)
+{
+ u8 power = 1;
+
+ if(controller->ops->get_power) {
+ power = controller->ops->get_power(slot);
+ }
+ return power;
+}
+
+static int
+get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
+{
+ struct slot *slot = hotplug_slot->private;
+
+ *value = cpci_get_power_status(slot);
+ return 0;
+}
+
+static int
+get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
+{
+ struct slot *slot = hotplug_slot->private;
+
+ *value = cpci_get_attention_status(slot);
+ return 0;
+}
+
+static int
+set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
+{
+ return cpci_set_attention_status(hotplug_slot->private, status);
+}
+
+static void release_slot(struct hotplug_slot *hotplug_slot)
+{
+ struct slot *slot = hotplug_slot->private;
+
+ kfree(slot->hotplug_slot->info);
+ kfree(slot->hotplug_slot->name);
+ kfree(slot->hotplug_slot);
+ kfree(slot);
+}
+
+#define SLOT_NAME_SIZE 6
+static void
+make_slot_name(struct slot *slot)
+{
+ snprintf(slot->hotplug_slot->name,
+ SLOT_NAME_SIZE, "%02x:%02x", slot->bus->number, slot->number);
+}
+
+int
+cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
+{
+ struct slot *slot;
+ struct hotplug_slot *hotplug_slot;
+ struct hotplug_slot_info *info;
+ char *name;
+ int status = -ENOMEM;
+ int i;
+
+ if(!(controller && bus)) {
+ return -ENODEV;
+ }
+
+ /*
+ * Create a structure for each slot, and register that slot
+ * with the pci_hotplug subsystem.
+ */
+ for (i = first; i <= last; ++i) {
+ slot = kmalloc(sizeof (struct slot), GFP_KERNEL);
+ if (!slot)
+ goto error;
+ memset(slot, 0, sizeof (struct slot));
+
+ hotplug_slot =
+ kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
+ if (!hotplug_slot)
+ goto error_slot;
+ memset(hotplug_slot, 0, sizeof (struct hotplug_slot));
+ slot->hotplug_slot = hotplug_slot;
+
+ info = kmalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
+ if (!info)
+ goto error_hpslot;
+ memset(info, 0, sizeof (struct hotplug_slot_info));
+ hotplug_slot->info = info;
+
+ name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
+ if (!name)
+ goto error_info;
+ hotplug_slot->name = name;
+
+ slot->bus = bus;
+ slot->number = i;
+ slot->devfn = PCI_DEVFN(i, 0);
+
+ hotplug_slot->private = slot;
+ hotplug_slot->release = &release_slot;
+ make_slot_name(slot);
+ hotplug_slot->ops = &cpci_hotplug_slot_ops;
+
+ /*
+ * Initialize the slot info structure with some known
+ * good values.
+ */
+ dbg("initializing slot %s", slot->hotplug_slot->name);
+ info->power_status = cpci_get_power_status(slot);
+ info->attention_status = cpci_get_attention_status(slot);
+
+ dbg("registering slot %s", slot->hotplug_slot->name);
+ status = pci_hp_register(slot->hotplug_slot);
+ if (status) {
+ err("pci_hp_register failed with error %d", status);
+ goto error_name;
+ }
+
+ /* Add slot to our internal list */
+ spin_lock(&list_lock);
+ list_add(&slot->slot_list, &slot_list);
+ slots++;
+ spin_unlock(&list_lock);
+ }
+ return 0;
+error_name:
+ kfree(name);
+error_info:
+ kfree(info);
+error_hpslot:
+ kfree(hotplug_slot);
+error_slot:
+ kfree(slot);
+error:
+ return status;
+}
+
+int
+cpci_hp_unregister_bus(struct pci_bus *bus)
+{
+ struct slot *slot;
+ struct list_head *tmp;
+ struct list_head *next;
+ int status;
+
+ spin_lock(&list_lock);
+ if(!slots) {
+ spin_unlock(&list_lock);
+ return -1;
+ }
+ list_for_each_safe(tmp, next, &slot_list) {
+ slot = list_entry(tmp, struct slot, slot_list);
+ if(slot->bus == bus) {
+ dbg("deregistering slot %s", slot->hotplug_slot->name);
+ status = pci_hp_deregister(slot->hotplug_slot);
+ if(status) {
+ err("pci_hp_deregister failed with error %d",
+ status);
+ return status;
+ }
+
+ list_del(&slot->slot_list);
+ slots--;
+ }
+ }
+ spin_unlock(&list_lock);
+ return 0;
+}
+
+/* This is the interrupt mode interrupt handler */
+static irqreturn_t
+cpci_hp_intr(int irq, void *data, struct pt_regs *regs)
+{
+ dbg("entered cpci_hp_intr");
+
+ /* Check to see if it was our interrupt */
+ if((controller->irq_flags & SA_SHIRQ) &&
+ !controller->ops->check_irq(controller->dev_id)) {
+ dbg("exited cpci_hp_intr, not our interrupt");
+ return IRQ_NONE;
+ }
+
+ /* Disable ENUM interrupt */
+ controller->ops->disable_irq();
+
+ /* Trigger processing by the event thread */
+ dbg("Signal event_semaphore");
+ up(&event_semaphore);
+ dbg("exited cpci_hp_intr");
+ return IRQ_HANDLED;
+}
+
+/*
+ * According to PICMG 2.12 R2.0, section 6.3.2, upon
+ * initialization, the system driver shall clear the
+ * INS bits of the cold-inserted devices.
+ */
+static int
+init_slots(void)
+{
+ struct slot *slot;
+ struct list_head *tmp;
+ struct pci_dev* dev;
+
+ dbg("%s - enter", __FUNCTION__);
+ spin_lock(&list_lock);
+ if(!slots) {
+ spin_unlock(&list_lock);
+ return -1;
+ }
+ list_for_each(tmp, &slot_list) {
+ slot = list_entry(tmp, struct slot, slot_list);
+ dbg("%s - looking at slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ if(cpci_check_and_clear_ins(slot)) {
+ dbg("%s - cleared INS for slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ dev = pci_find_slot(slot->bus->number, PCI_DEVFN(slot->number, 0));
+ if(dev) {
+ if(update_adapter_status(slot->hotplug_slot, 1)) {
+ warn("failure to update adapter file");
+ }
+ if(update_latch_status(slot->hotplug_slot, 1)) {
+ warn("failure to update latch file");
+ }
+ slot->dev = dev;
+ } else {
+ err("%s - no driver attached to device in slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ }
+ }
+ }
+ spin_unlock(&list_lock);
+ dbg("%s - exit", __FUNCTION__);
+ return 0;
+}
+
+static int
+check_slots(void)
+{
+ struct slot *slot;
+ struct list_head *tmp;
+ int extracted;
+ int inserted;
+
+ spin_lock(&list_lock);
+ if(!slots) {
+ spin_unlock(&list_lock);
+ err("no slots registered, shutting down");
+ return -1;
+ }
+ extracted = inserted = 0;
+ list_for_each(tmp, &slot_list) {
+ slot = list_entry(tmp, struct slot, slot_list);
+ dbg("%s - looking at slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ if(cpci_check_and_clear_ins(slot)) {
+ u16 hs_csr;
+
+ /* Some broken hardware (e.g. PLX 9054AB) asserts ENUM# twice... */
+ if(slot->dev) {
+ warn("slot %s already inserted", slot->hotplug_slot->name);
+ inserted++;
+ continue;
+ }
+
+ /* Process insertion */
+ dbg("%s - slot %s inserted",
+ __FUNCTION__, slot->hotplug_slot->name);
+
+ /* GSM, debug */
+ hs_csr = cpci_get_hs_csr(slot);
+ dbg("%s - slot %s HS_CSR (1) = %04x",
+ __FUNCTION__, slot->hotplug_slot->name, hs_csr);
+
+ /* Configure device */
+ dbg("%s - configuring slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ if(cpci_configure_slot(slot)) {
+ err("%s - could not configure slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+ continue;
+ }
+ dbg("%s - finished configuring slot %s",
+ __FUNCTION__, slot->hotplug_slot->name);
+
+ /* GSM, debug */
+ hs_csr = cpci_get_hs_csr(slot);
+ dbg("%s - slot %s HS_CSR (2) = %04x",
+ __FUNCTION__, slot->hotplug_slot->name, hs_csr);
+
+ if(update_latch_status(slot->hotplug_slot, 1)) {
+ warn("failure to update latch file");
+ }
+
+ if(update_adapter_status(slot->hotplug_slot, 1)) {
+ warn("failure to update adapter file");
+ }
+
+ cpci_led_off(slot);
+
+ /* GSM, debug */
+ hs_csr = cpci_get_hs_csr(slot);
+ dbg("%s - slot %s HS_CSR (3) = %04x",
+ __FUNCTION__, slot->hotplug_slot->name, hs_csr);
+
+ inserted++;
+ } else if(cpci_check_ext(slot)) {
+ u16 hs_csr;
+
+ /* Process extraction request */
+ dbg("%s - slot %s extracted",
+ __FUNCTION__, slot->hotplug_slot->name);
+
+ /* GSM, debug */
+ hs_csr = cpci_get_hs_csr(slot);
+ dbg("%s - slot %s HS_CSR = %04x",
+ __FUNCTION__, slot->hotplug_slot->name, hs_csr);
+
+ if(!slot->extracting) {
+ if(update_latch_status(slot->hotplug_slot, 0)) {
+ warn("failure to update latch file");
+ }
+ slot->extracting = 1;
+ }
+ extracted++;
+ }
+ }
+ spin_unlock(&list_lock);
+ if(inserted || extracted) {
+ return extracted;
+ }
+ else {
+ err("cannot find ENUM# source, shutting down");
+ return -1;
+ }
+}
+
+/* This is the interrupt mode worker thread body */
+static int
+event_thread(void *data)
+{
+ int rc;
+ struct slot *slot;
+ struct list_head *tmp;
+
+ lock_kernel();
+ daemonize("cpci_hp_eventd");
+ unlock_kernel();
+
+ dbg("%s - event thread started", __FUNCTION__);
+ while(1) {
+ dbg("event thread sleeping");
+ down_interruptible(&event_semaphore);
+ dbg("event thread woken, thread_finished = %d",
+ thread_finished);
+ if(thread_finished || signal_pending(current))
+ break;
+ while(controller->ops->query_enum()) {
+ rc = check_slots();
+ if (rc > 0)
+ /* Give userspace a chance to handle extraction */
+ msleep(500);
+ else if (rc < 0) {
+ dbg("%s - error checking slots", __FUNCTION__);
+ thread_finished = 1;
+ break;
+ }
+ }
+ /* Check for someone yanking out a board */
+ list_for_each(tmp, &slot_list) {
+ slot = list_entry(tmp, struct slot, slot_list);
+ if(slot->extracting) {
+ /*
+ * Hmmm, we're likely hosed at this point, should we
+ * bother trying to tell the driver or not?
+ */
+ err("card in slot %s was improperly removed",
+ slot->hotplug_slot->name);
+ if(update_adapter_status(slot->hotplug_slot, 0)) {
+ warn("failure to update adapter file");
+ }
+ slot->extracting = 0;
+ }
+ }
+
+ /* Re-enable ENUM# interrupt */
+ dbg("%s - re-enabling irq", __FUNCTION__);
+ controller->ops->enable_irq();
+ }
+
+ dbg("%s - event thread signals exit", __FUNCTION__);
+ up(&thread_exit);
+ return 0;
+}
+
+/* This is the polling mode worker thread body */
+static int
+poll_thread(void *data)
+{
+ int rc;
+ struct slot *slot;
+ struct list_head *tmp;
+
+ lock_kernel();
+ daemonize("cpci_hp_polld");
+ unlock_kernel();
+
+ while(1) {
+ if(thread_finished || signal_pending(current))
+ break;
+
+ while(controller->ops->query_enum()) {
+ rc = check_slots();
+ if(rc > 0)
+ /* Give userspace a chance to handle extraction */
+ msleep(500);
+ else if (rc < 0) {
+ dbg("%s - error checking slots", __FUNCTION__);
+ thread_finished = 1;
+ break;
+ }
+ }
+ /* Check for someone yanking out a board */
+ list_for_each(tmp, &slot_list) {
+ slot = list_entry(tmp, struct slot, slot_list);
+ if(slot->extracting) {
+ /*
+ * Hmmm, we're likely hosed at this point, should we
+ * bother trying to tell the driver or not?
+ */
+ err("card in slot %s was improperly removed",
+ slot->hotplug_slot->name);
+ if(update_adapter_status(slot->hotplug_slot, 0)) {
+ warn("failure to update adapter file");
+ }
+ slot->extracting = 0;
+ }
+ }
+
+ msleep(100);
+ }
+ dbg("poll thread signals exit");
+ up(&thread_exit);
+ return 0;
+}
+
+static int
+cpci_start_thread(void)
+{
+ int pid;
+
+ /* initialize our semaphores */
+ init_MUTEX_LOCKED(&event_semaphore);
+ init_MUTEX_LOCKED(&thread_exit);
+ thread_finished = 0;
+
+ if(controller->irq) {
+ pid = kernel_thread(event_thread, NULL, 0);
+ } else {
+ pid = kernel_thread(poll_thread, NULL, 0);
+ }
+ if(pid < 0) {
+ err("Can't start up our thread");
+ return -1;
+ }
+ dbg("Our thread pid = %d", pid);
+ return 0;
+}
+
+static void
+cpci_stop_thread(void)
+{
+ thread_finished = 1;
+ dbg("thread finish command given");
+ if(controller->irq) {
+ up(&event_semaphore);
+ }
+ dbg("wait for thread to exit");
+ down(&thread_exit);
+}
+
+int
+cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
+{
+ int status = 0;
+
+ if(!controller) {
+ controller = new_controller;
+ if(controller->irq) {
+ if(request_irq(controller->irq,
+ cpci_hp_intr,
+ controller->irq_flags,
+ MY_NAME, controller->dev_id)) {
+ err("Can't get irq %d for the hotplug cPCI controller", controller->irq);
+ status = -ENODEV;
+ }
+ dbg("%s - acquired controller irq %d", __FUNCTION__,
+ controller->irq);
+ }
+ } else {
+ err("cPCI hotplug controller already registered");
+ status = -1;
+ }
+ return status;
+}
+
+int
+cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
+{
+ int status = 0;
+
+ if(controller) {
+ if(!thread_finished) {
+ cpci_stop_thread();
+ }
+ if(controller->irq) {
+ free_irq(controller->irq, controller->dev_id);
+ }
+ controller = NULL;
+ } else {
+ status = -ENODEV;
+ }
+ return status;
+}
+
+int
+cpci_hp_start(void)
+{
+ static int first = 1;
+ int status;
+
+ dbg("%s - enter", __FUNCTION__);
+ if(!controller) {
+ return -ENODEV;
+ }
+
+ spin_lock(&list_lock);
+ if(!slots) {
+ spin_unlock(&list_lock);
+ return -ENODEV;
+ }
+ spin_unlock(&list_lock);
+
+ if(first) {
+ status = init_slots();
+ if(status) {
+ return status;
+ }
+ first = 0;
+ }
+
+ status = cpci_start_thread();
+ if(status) {
+ return status;
+ }
+ dbg("%s - thread started", __FUNCTION__);
+
+ if(controller->irq) {
+ /* Start enum interrupt processing */
+ dbg("%s - enabling irq", __FUNCTION__);
+ controller->ops->enable_irq();
+ }
+ dbg("%s - exit", __FUNCTION__);
+ return 0;
+}
+
+int
+cpci_hp_stop(void)
+{
+ if(!controller) {
+ return -ENODEV;
+ }
+
+ if(controller->irq) {
+ /* Stop enum interrupt processing */
+ dbg("%s - disabling irq", __FUNCTION__);
+ controller->ops->disable_irq();
+ }
+ cpci_stop_thread();
+ return 0;
+}
+
+static void __exit
+cleanup_slots(void)
+{
+ struct list_head *tmp;
+ struct slot *slot;
+
+ /*
+ * Unregister all of our slots with the pci_hotplug subsystem,
+ * and free up all memory that we had allocated.
+ */
+ spin_lock(&list_lock);
+ if(!slots) {
+ goto null_cleanup;
+ }
+ list_for_each(tmp, &slot_list) {
+ slot = list_entry(tmp, struct slot, slot_list);
+ list_del(&slot->slot_list);
+ pci_hp_deregister(slot->hotplug_slot);
+ kfree(slot->hotplug_slot->info);
+ kfree(slot->hotplug_slot->name);
+ kfree(slot->hotplug_slot);
+ kfree(slot);
+ }
+ null_cleanup:
+ spin_unlock(&list_lock);
+ return;
+}
+
+int __init
+cpci_hotplug_init(int debug)
+{
+ spin_lock_init(&list_lock);
+ cpci_debug = debug;
+
+ info(DRIVER_DESC " version: " DRIVER_VERSION);
+ return 0;
+}
+
+void __exit
+cpci_hotplug_exit(void)
+{
+ /*
+ * Clean everything up.
+ */
+ cleanup_slots();
+}
+
+EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
+EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
+EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
+EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
+EXPORT_SYMBOL_GPL(cpci_hp_start);
+EXPORT_SYMBOL_GPL(cpci_hp_stop);