--- /dev/null
+/*
+ * CompactPCI Hot Plug Driver
+ *
+ * Copyright (C) 2002,2005 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/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/atomic.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include "cpci_hotplug.h"
+
+#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 DECLARE_RWSEM(list_rwsem);
+static LIST_HEAD(slot_list);
+static int slots;
+static atomic_t extracting;
+int cpci_debug;
+static struct cpci_hp_controller *controller;
+static struct task_struct *cpci_thread;
+static int thread_finished;
+
+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 int get_adapter_status(struct hotplug_slot *slot, u8 *value);
+static int get_latch_status(struct hotplug_slot *slot, u8 *value);
+
+static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
+ .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,
+ .get_adapter_status = get_adapter_status,
+ .get_latch_status = get_latch_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", __func__, slot_name(slot));
+
+ 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", __func__, slot_name(slot));
+
+ down_write(&list_rwsem);
+
+ /* Unconfigure device */
+ dbg("%s - unconfiguring slot %s", __func__, slot_name(slot));
+ retval = cpci_unconfigure_slot(slot);
+ if (retval) {
+ err("%s - could not unconfigure slot %s",
+ __func__, slot_name(slot));
+ goto disable_error;
+ }
+ dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot));
+
+ /* Clear EXT (by setting it) */
+ if (cpci_clear_ext(slot)) {
+ err("%s - could not clear EXT for slot %s",
+ __func__, slot_name(slot));
+ retval = -ENODEV;
+ goto disable_error;
+ }
+ cpci_led_on(slot);
+
+ if (controller->ops->set_power) {
+ retval = controller->ops->set_power(slot, 0);
+ if (retval)
+ goto disable_error;
+ }
+
+ if (update_adapter_status(slot->hotplug_slot, 0))
+ warn("failure to update adapter file");
+
+ if (slot->extracting) {
+ slot->extracting = 0;
+ atomic_dec(&extracting);
+ }
+disable_error:
+ up_write(&list_rwsem);
+ 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 int
+get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ *value = hotplug_slot->info->adapter_status;
+ return 0;
+}
+
+static int
+get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
+{
+ *value = hotplug_slot->info->latch_status;
+ return 0;
+}
+
+static void release_slot(struct hotplug_slot *hotplug_slot)
+{
+ struct slot *slot = hotplug_slot->private;
+
+ kfree(slot->hotplug_slot->info);
+ kfree(slot->hotplug_slot);
+ pci_dev_put(slot->dev);
+ kfree(slot);
+}
+
+#define SLOT_NAME_SIZE 6
+
+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[SLOT_NAME_SIZE];
+ int status;
+ 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 = kzalloc(sizeof (struct slot), GFP_KERNEL);
+ if (!slot) {
+ status = -ENOMEM;
+ goto error;
+ }
+
+ hotplug_slot =
+ kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
+ if (!hotplug_slot) {
+ status = -ENOMEM;
+ goto error_slot;
+ }
+ slot->hotplug_slot = hotplug_slot;
+
+ info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
+ if (!info) {
+ status = -ENOMEM;
+ goto error_hpslot;
+ }
+ hotplug_slot->info = info;
+
+ slot->bus = bus;
+ slot->number = i;
+ slot->devfn = PCI_DEVFN(i, 0);
+
+ snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i);
+
+ hotplug_slot->private = slot;
+ hotplug_slot->release = &release_slot;
+ hotplug_slot->ops = &cpci_hotplug_slot_ops;
+
+ /*
+ * Initialize the slot info structure with some known
+ * good values.
+ */
+ dbg("initializing slot %s", name);
+ info->power_status = cpci_get_power_status(slot);
+ info->attention_status = cpci_get_attention_status(slot);
+
+ dbg("registering slot %s", name);
+ status = pci_hp_register(slot->hotplug_slot, bus, i, name);
+ if (status) {
+ err("pci_hp_register failed with error %d", status);
+ goto error_info;
+ }
+ dbg("slot registered with name: %s", slot_name(slot));
+
+ /* Add slot to our internal list */
+ down_write(&list_rwsem);
+ list_add(&slot->slot_list, &slot_list);
+ slots++;
+ up_write(&list_rwsem);
+ }
+ return 0;
+error_info:
+ kfree(info);
+error_hpslot:
+ kfree(hotplug_slot);
+error_slot:
+ kfree(slot);
+error:
+ return status;
+}
+EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
+
+int
+cpci_hp_unregister_bus(struct pci_bus *bus)
+{
+ struct slot *slot;
+ struct slot *tmp;
+ int status = 0;
+
+ down_write(&list_rwsem);
+ if (!slots) {
+ up_write(&list_rwsem);
+ return -1;
+ }
+ list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
+ if (slot->bus == bus) {
+ list_del(&slot->slot_list);
+ slots--;
+
+ dbg("deregistering slot %s", slot_name(slot));
+ status = pci_hp_deregister(slot->hotplug_slot);
+ if (status) {
+ err("pci_hp_deregister failed with error %d",
+ status);
+ break;
+ }
+ }
+ }
+ up_write(&list_rwsem);
+ return status;
+}
+EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
+
+/* This is the interrupt mode interrupt handler */
+static irqreturn_t
+cpci_hp_intr(int irq, void *data)
+{
+ dbg("entered cpci_hp_intr");
+
+ /* Check to see if it was our interrupt */
+ if ((controller->irq_flags & IRQF_SHARED) &&
+ !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 */
+ wake_up_process(cpci_thread);
+ return IRQ_HANDLED;
+}
+
+/*
+ * According to PICMG 2.1 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(int clear_ins)
+{
+ struct slot *slot;
+ struct pci_dev *dev;
+
+ dbg("%s - enter", __func__);
+ down_read(&list_rwsem);
+ if (!slots) {
+ up_read(&list_rwsem);
+ return -1;
+ }
+ list_for_each_entry(slot, &slot_list, slot_list) {
+ dbg("%s - looking at slot %s", __func__, slot_name(slot));
+ if (clear_ins && cpci_check_and_clear_ins(slot))
+ dbg("%s - cleared INS for slot %s",
+ __func__, slot_name(slot));
+ dev = pci_get_slot(slot->bus, 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;
+ }
+ }
+ up_read(&list_rwsem);
+ dbg("%s - exit", __func__);
+ return 0;
+}
+
+static int
+check_slots(void)
+{
+ struct slot *slot;
+ int extracted;
+ int inserted;
+ u16 hs_csr;
+
+ down_read(&list_rwsem);
+ if (!slots) {
+ up_read(&list_rwsem);
+ err("no slots registered, shutting down");
+ return -1;
+ }
+ extracted = inserted = 0;
+ list_for_each_entry(slot, &slot_list, slot_list) {
+ dbg("%s - looking at slot %s", __func__, slot_name(slot));
+ if (cpci_check_and_clear_ins(slot)) {
+ /*
+ * Some broken hardware (e.g. PLX 9054AB) asserts
+ * ENUM# twice...
+ */
+ if (slot->dev) {
+ warn("slot %s already inserted",
+ slot_name(slot));
+ inserted++;
+ continue;
+ }
+
+ /* Process insertion */
+ dbg("%s - slot %s inserted", __func__, slot_name(slot));
+
+ /* GSM, debug */
+ hs_csr = cpci_get_hs_csr(slot);
+ dbg("%s - slot %s HS_CSR (1) = %04x",
+ __func__, slot_name(slot), hs_csr);
+
+ /* Configure device */
+ dbg("%s - configuring slot %s",
+ __func__, slot_name(slot));
+ if (cpci_configure_slot(slot)) {
+ err("%s - could not configure slot %s",
+ __func__, slot_name(slot));
+ continue;
+ }
+ dbg("%s - finished configuring slot %s",
+ __func__, slot_name(slot));
+
+ /* GSM, debug */
+ hs_csr = cpci_get_hs_csr(slot);
+ dbg("%s - slot %s HS_CSR (2) = %04x",
+ __func__, slot_name(slot), 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",
+ __func__, slot_name(slot), hs_csr);
+
+ inserted++;
+ } else if (cpci_check_ext(slot)) {
+ /* Process extraction request */
+ dbg("%s - slot %s extracted",
+ __func__, slot_name(slot));
+
+ /* GSM, debug */
+ hs_csr = cpci_get_hs_csr(slot);
+ dbg("%s - slot %s HS_CSR = %04x",
+ __func__, slot_name(slot), hs_csr);
+
+ if (!slot->extracting) {
+ if (update_latch_status(slot->hotplug_slot, 0))
+ warn("failure to update latch file");
+
+ slot->extracting = 1;
+ atomic_inc(&extracting);
+ }
+ extracted++;
+ } else if (slot->extracting) {
+ hs_csr = cpci_get_hs_csr(slot);
+ if (hs_csr == 0xffff) {
+ /*
+ * 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_name(slot));
+ if (update_adapter_status(slot->hotplug_slot, 0))
+ warn("failure to update adapter file");
+ slot->extracting = 0;
+ atomic_dec(&extracting);
+ }
+ }
+ }
+ up_read(&list_rwsem);
+ dbg("inserted=%d, extracted=%d, extracting=%d",
+ inserted, extracted, atomic_read(&extracting));
+ if (inserted || extracted)
+ return extracted;
+ else if (!atomic_read(&extracting)) {
+ err("cannot find ENUM# source, shutting down");
+ return -1;
+ }
+ return 0;
+}
+
+/* This is the interrupt mode worker thread body */
+static int
+event_thread(void *data)
+{
+ int rc;
+
+ dbg("%s - event thread started", __func__);
+ while (1) {
+ dbg("event thread sleeping");
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ if (kthread_should_stop())
+ break;
+ do {
+ rc = check_slots();
+ if (rc > 0) {
+ /* Give userspace a chance to handle extraction */
+ msleep(500);
+ } else if (rc < 0) {
+ dbg("%s - error checking slots", __func__);
+ thread_finished = 1;
+ goto out;
+ }
+ } while (atomic_read(&extracting) && !kthread_should_stop());
+ if (kthread_should_stop())
+ break;
+
+ /* Re-enable ENUM# interrupt */
+ dbg("%s - re-enabling irq", __func__);
+ controller->ops->enable_irq();
+ }
+ out:
+ return 0;
+}
+
+/* This is the polling mode worker thread body */
+static int
+poll_thread(void *data)
+{
+ int rc;
+
+ while (1) {
+ if (kthread_should_stop() || signal_pending(current))
+ break;
+ if (controller->ops->query_enum()) {
+ do {
+ rc = check_slots();
+ if (rc > 0) {
+ /* Give userspace a chance to handle extraction */
+ msleep(500);
+ } else if (rc < 0) {
+ dbg("%s - error checking slots", __func__);
+ thread_finished = 1;
+ goto out;
+ }
+ } while (atomic_read(&extracting) && !kthread_should_stop());
+ }
+ msleep(100);
+ }
+ out:
+ return 0;
+}
+
+static int
+cpci_start_thread(void)
+{
+ if (controller->irq)
+ cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd");
+ else
+ cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld");
+ if (IS_ERR(cpci_thread)) {
+ err("Can't start up our thread");
+ return PTR_ERR(cpci_thread);
+ }
+ thread_finished = 0;
+ return 0;
+}
+
+static void
+cpci_stop_thread(void)
+{
+ kthread_stop(cpci_thread);
+ thread_finished = 1;
+}
+
+int
+cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
+{
+ int status = 0;
+
+ if (controller)
+ return -1;
+ if (!(new_controller && new_controller->ops))
+ return -EINVAL;
+ if (new_controller->irq) {
+ if (!(new_controller->ops->enable_irq &&
+ new_controller->ops->disable_irq))
+ status = -EINVAL;
+ if (request_irq(new_controller->irq,
+ cpci_hp_intr,
+ new_controller->irq_flags,
+ MY_NAME,
+ new_controller->dev_id)) {
+ err("Can't get irq %d for the hotplug cPCI controller",
+ new_controller->irq);
+ status = -ENODEV;
+ }
+ dbg("%s - acquired controller irq %d",
+ __func__, new_controller->irq);
+ }
+ if (!status)
+ controller = new_controller;
+ return status;
+}
+EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
+
+static void
+cleanup_slots(void)
+{
+ struct slot *slot;
+ struct slot *tmp;
+
+ /*
+ * Unregister all of our slots with the pci_hotplug subsystem,
+ * and free up all memory that we had allocated.
+ */
+ down_write(&list_rwsem);
+ if (!slots)
+ goto cleanup_null;
+ list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
+ list_del(&slot->slot_list);
+ pci_hp_deregister(slot->hotplug_slot);
+ }
+cleanup_null:
+ up_write(&list_rwsem);
+ return;
+}
+
+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;
+ cleanup_slots();
+ } else
+ status = -ENODEV;
+ return status;
+}
+EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
+
+int
+cpci_hp_start(void)
+{
+ static int first = 1;
+ int status;
+
+ dbg("%s - enter", __func__);
+ if (!controller)
+ return -ENODEV;
+
+ down_read(&list_rwsem);
+ if (list_empty(&slot_list)) {
+ up_read(&list_rwsem);
+ return -ENODEV;
+ }
+ up_read(&list_rwsem);
+
+ status = init_slots(first);
+ if (first)
+ first = 0;
+ if (status)
+ return status;
+
+ status = cpci_start_thread();
+ if (status)
+ return status;
+ dbg("%s - thread started", __func__);
+
+ if (controller->irq) {
+ /* Start enum interrupt processing */
+ dbg("%s - enabling irq", __func__);
+ controller->ops->enable_irq();
+ }
+ dbg("%s - exit", __func__);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpci_hp_start);
+
+int
+cpci_hp_stop(void)
+{
+ if (!controller)
+ return -ENODEV;
+ if (controller->irq) {
+ /* Stop enum interrupt processing */
+ dbg("%s - disabling irq", __func__);
+ controller->ops->disable_irq();
+ }
+ cpci_stop_thread();
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cpci_hp_stop);
+
+int __init
+cpci_hotplug_init(int debug)
+{
+ cpci_debug = debug;
+ return 0;
+}
+
+void __exit
+cpci_hotplug_exit(void)
+{
+ /*
+ * Clean everything up.
+ */
+ cpci_hp_stop();
+ cpci_hp_unregister_controller(controller);
+}
Code Review / kvmfornfv.git / blobdiff