drivers/pci/hotplug/cpci_hotplug_pci.c - kernel/quantenna - Git at Google

 /*
  * CompactPCI Hot Plug Driver PCI functions
  *
  * Copyright (C) 2002,2005 by SOMA Networks, Inc.
  *
  * 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/pci.h>
 #include <linux/pci_hotplug.h>
 #include <linux/proc_fs.h>
 #include "../pci.h"
 #include "cpci_hotplug.h"

 #define MY_NAME	"cpci_hotplug"

 extern int cpci_debug;

 #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)


 u8 cpci_get_attention_status(struct slot *slot)
 {
 	int hs_cap;
 	u16 hs_csr;

 	hs_cap = pci_bus_find_capability(slot->bus,
 					 slot->devfn,
 					 PCI_CAP_ID_CHSWP);
 	if (!hs_cap)
 		return 0;

 	if (pci_bus_read_config_word(slot->bus,
 				     slot->devfn,
 				     hs_cap + 2,
 				     &hs_csr))
 		return 0;

 	return hs_csr & 0x0008 ? 1 : 0;
 }

 int cpci_set_attention_status(struct slot *slot, int status)
 {
 	int hs_cap;
 	u16 hs_csr;

 	hs_cap = pci_bus_find_capability(slot->bus,
 					 slot->devfn,
 					 PCI_CAP_ID_CHSWP);
 	if (!hs_cap)
 		return 0;
 	if (pci_bus_read_config_word(slot->bus,
 				     slot->devfn,
 				     hs_cap + 2,
 				     &hs_csr))
 		return 0;
 	if (status)
 		hs_csr |= HS_CSR_LOO;
 	else
 		hs_csr &= ~HS_CSR_LOO;
 	if (pci_bus_write_config_word(slot->bus,
 				      slot->devfn,
 				      hs_cap + 2,
 				      hs_csr))
 		return 0;
 	return 1;
 }

 u16 cpci_get_hs_csr(struct slot *slot)
 {
 	int hs_cap;
 	u16 hs_csr;

 	hs_cap = pci_bus_find_capability(slot->bus,
 					 slot->devfn,
 					 PCI_CAP_ID_CHSWP);
 	if (!hs_cap)
 		return 0xFFFF;
 	if (pci_bus_read_config_word(slot->bus,
 				     slot->devfn,
 				     hs_cap + 2,
 				     &hs_csr))
 		return 0xFFFF;
 	return hs_csr;
 }

 int cpci_check_and_clear_ins(struct slot *slot)
 {
 	int hs_cap;
 	u16 hs_csr;
 	int ins = 0;

 	hs_cap = pci_bus_find_capability(slot->bus,
 					 slot->devfn,
 					 PCI_CAP_ID_CHSWP);
 	if (!hs_cap)
 		return 0;
 	if (pci_bus_read_config_word(slot->bus,
 				     slot->devfn,
 				     hs_cap + 2,
 				     &hs_csr))
 		return 0;
 	if (hs_csr & HS_CSR_INS) {
 		/* Clear INS (by setting it) */
 		if (pci_bus_write_config_word(slot->bus,
 					      slot->devfn,
 					      hs_cap + 2,
 					      hs_csr))
 			ins = 0;
 		else
 			ins = 1;
 	}
 	return ins;
 }

 int cpci_check_ext(struct slot *slot)
 {
 	int hs_cap;
 	u16 hs_csr;
 	int ext = 0;

 	hs_cap = pci_bus_find_capability(slot->bus,
 					 slot->devfn,
 					 PCI_CAP_ID_CHSWP);
 	if (!hs_cap)
 		return 0;
 	if (pci_bus_read_config_word(slot->bus,
 				     slot->devfn,
 				     hs_cap + 2,
 				     &hs_csr))
 		return 0;
 	if (hs_csr & HS_CSR_EXT)
 		ext = 1;
 	return ext;
 }

 int cpci_clear_ext(struct slot *slot)
 {
 	int hs_cap;
 	u16 hs_csr;

 	hs_cap = pci_bus_find_capability(slot->bus,
 					 slot->devfn,
 					 PCI_CAP_ID_CHSWP);
 	if (!hs_cap)
 		return -ENODEV;
 	if (pci_bus_read_config_word(slot->bus,
 				     slot->devfn,
 				     hs_cap + 2,
 				     &hs_csr))
 		return -ENODEV;
 	if (hs_csr & HS_CSR_EXT) {
 		/* Clear EXT (by setting it) */
 		if (pci_bus_write_config_word(slot->bus,
 					      slot->devfn,
 					      hs_cap + 2,
 					      hs_csr))
 			return -ENODEV;
 	}
 	return 0;
 }

 int cpci_led_on(struct slot *slot)
 {
 	int hs_cap;
 	u16 hs_csr;

 	hs_cap = pci_bus_find_capability(slot->bus,
 					 slot->devfn,
 					 PCI_CAP_ID_CHSWP);
 	if (!hs_cap)
 		return -ENODEV;
 	if (pci_bus_read_config_word(slot->bus,
 				     slot->devfn,
 				     hs_cap + 2,
 				     &hs_csr))
 		return -ENODEV;
 	if ((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
 		hs_csr |= HS_CSR_LOO;
 		if (pci_bus_write_config_word(slot->bus,
 					      slot->devfn,
 					      hs_cap + 2,
 					      hs_csr)) {
 			err("Could not set LOO for slot %s",
 			    hotplug_slot_name(slot->hotplug_slot));
 			return -ENODEV;
 		}
 	}
 	return 0;
 }

 int cpci_led_off(struct slot *slot)
 {
 	int hs_cap;
 	u16 hs_csr;

 	hs_cap = pci_bus_find_capability(slot->bus,
 					 slot->devfn,
 					 PCI_CAP_ID_CHSWP);
 	if (!hs_cap)
 		return -ENODEV;
 	if (pci_bus_read_config_word(slot->bus,
 				     slot->devfn,
 				     hs_cap + 2,
 				     &hs_csr))
 		return -ENODEV;
 	if (hs_csr & HS_CSR_LOO) {
 		hs_csr &= ~HS_CSR_LOO;
 		if (pci_bus_write_config_word(slot->bus,
 					      slot->devfn,
 					      hs_cap + 2,
 					      hs_csr)) {
 			err("Could not clear LOO for slot %s",
 			    hotplug_slot_name(slot->hotplug_slot));
 			return -ENODEV;
 		}
 	}
 	return 0;
 }


 /*
  * Device configuration functions
  */

 int cpci_configure_slot(struct slot *slot)
 {
 	struct pci_dev *dev;
 	struct pci_bus *parent;
 	int ret = 0;

 	dbg("%s - enter", __func__);

 	pci_lock_rescan_remove();

 	if (slot->dev == NULL) {
 		dbg("pci_dev null, finding %02x:%02x:%x",
 		    slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
 		slot->dev = pci_get_slot(slot->bus, slot->devfn);
 	}

 	/* Still NULL? Well then scan for it! */
 	if (slot->dev == NULL) {
 		int n;
 		dbg("pci_dev still null");

 		/*
 		 * This will generate pci_dev structures for all functions, but
 		 * we will only call this case when lookup fails.
 		 */
 		n = pci_scan_slot(slot->bus, slot->devfn);
 		dbg("%s: pci_scan_slot returned %d", __func__, n);
 		slot->dev = pci_get_slot(slot->bus, slot->devfn);
 		if (slot->dev == NULL) {
 			err("Could not find PCI device for slot %02x", slot->number);
 			ret = -ENODEV;
 			goto out;
 		}
 	}
 	parent = slot->dev->bus;

 	list_for_each_entry(dev, &parent->devices, bus_list) {
 		if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
 			continue;
 		if (pci_is_bridge(dev))
 			pci_hp_add_bridge(dev);
 	}


 	pci_assign_unassigned_bridge_resources(parent->self);

 	pci_bus_add_devices(parent);

  out:
 	pci_unlock_rescan_remove();
 	dbg("%s - exit", __func__);
 	return ret;
 }

 int cpci_unconfigure_slot(struct slot *slot)
 {
 	struct pci_dev *dev, *temp;

 	dbg("%s - enter", __func__);
 	if (!slot->dev) {
 		err("No device for slot %02x\n", slot->number);
 		return -ENODEV;
 	}

 	pci_lock_rescan_remove();

 	list_for_each_entry_safe(dev, temp, &slot->bus->devices, bus_list) {
 		if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
 			continue;
 		pci_dev_get(dev);
 		pci_stop_and_remove_bus_device(dev);
 		pci_dev_put(dev);
 	}
 	pci_dev_put(slot->dev);
 	slot->dev = NULL;

 	pci_unlock_rescan_remove();

 	dbg("%s - exit", __func__);
 	return 0;
 }
	/*
	* CompactPCI Hot Plug Driver PCI functions
	*
	* Copyright (C) 2002,2005 by SOMA Networks, Inc.
	*
	* 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/pci.h>
	#include <linux/pci_hotplug.h>
	#include <linux/proc_fs.h>
	#include "../pci.h"
	#include "cpci_hotplug.h"

	#define MY_NAME "cpci_hotplug"

	extern int cpci_debug;

	#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)


	u8 cpci_get_attention_status(struct slot *slot)
	{
	int hs_cap;
	u16 hs_csr;

	hs_cap = pci_bus_find_capability(slot->bus,
	slot->devfn,
	PCI_CAP_ID_CHSWP);
	if (!hs_cap)
	return 0;

	if (pci_bus_read_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	&hs_csr))
	return 0;

	return hs_csr & 0x0008 ? 1 : 0;
	}

	int cpci_set_attention_status(struct slot *slot, int status)
	{
	int hs_cap;
	u16 hs_csr;

	hs_cap = pci_bus_find_capability(slot->bus,
	slot->devfn,
	PCI_CAP_ID_CHSWP);
	if (!hs_cap)
	return 0;
	if (pci_bus_read_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	&hs_csr))
	return 0;
	if (status)
	hs_csr \|= HS_CSR_LOO;
	else
	hs_csr &= ~HS_CSR_LOO;
	if (pci_bus_write_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	hs_csr))
	return 0;
	return 1;
	}

	u16 cpci_get_hs_csr(struct slot *slot)
	{
	int hs_cap;
	u16 hs_csr;

	hs_cap = pci_bus_find_capability(slot->bus,
	slot->devfn,
	PCI_CAP_ID_CHSWP);
	if (!hs_cap)
	return 0xFFFF;
	if (pci_bus_read_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	&hs_csr))
	return 0xFFFF;
	return hs_csr;
	}

	int cpci_check_and_clear_ins(struct slot *slot)
	{
	int hs_cap;
	u16 hs_csr;
	int ins = 0;

	hs_cap = pci_bus_find_capability(slot->bus,
	slot->devfn,
	PCI_CAP_ID_CHSWP);
	if (!hs_cap)
	return 0;
	if (pci_bus_read_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	&hs_csr))
	return 0;
	if (hs_csr & HS_CSR_INS) {
	/* Clear INS (by setting it) */
	if (pci_bus_write_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	hs_csr))
	ins = 0;
	else
	ins = 1;
	}
	return ins;
	}

	int cpci_check_ext(struct slot *slot)
	{
	int hs_cap;
	u16 hs_csr;
	int ext = 0;

	hs_cap = pci_bus_find_capability(slot->bus,
	slot->devfn,
	PCI_CAP_ID_CHSWP);
	if (!hs_cap)
	return 0;
	if (pci_bus_read_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	&hs_csr))
	return 0;
	if (hs_csr & HS_CSR_EXT)
	ext = 1;
	return ext;
	}

	int cpci_clear_ext(struct slot *slot)
	{
	int hs_cap;
	u16 hs_csr;

	hs_cap = pci_bus_find_capability(slot->bus,
	slot->devfn,
	PCI_CAP_ID_CHSWP);
	if (!hs_cap)
	return -ENODEV;
	if (pci_bus_read_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	&hs_csr))
	return -ENODEV;
	if (hs_csr & HS_CSR_EXT) {
	/* Clear EXT (by setting it) */
	if (pci_bus_write_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	hs_csr))
	return -ENODEV;
	}
	return 0;
	}

	int cpci_led_on(struct slot *slot)
	{
	int hs_cap;
	u16 hs_csr;

	hs_cap = pci_bus_find_capability(slot->bus,
	slot->devfn,
	PCI_CAP_ID_CHSWP);
	if (!hs_cap)
	return -ENODEV;
	if (pci_bus_read_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	&hs_csr))
	return -ENODEV;
	if ((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
	hs_csr \|= HS_CSR_LOO;
	if (pci_bus_write_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	hs_csr)) {
	err("Could not set LOO for slot %s",
	hotplug_slot_name(slot->hotplug_slot));
	return -ENODEV;
	}
	}
	return 0;
	}

	int cpci_led_off(struct slot *slot)
	{
	int hs_cap;
	u16 hs_csr;

	hs_cap = pci_bus_find_capability(slot->bus,
	slot->devfn,
	PCI_CAP_ID_CHSWP);
	if (!hs_cap)
	return -ENODEV;
	if (pci_bus_read_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	&hs_csr))
	return -ENODEV;
	if (hs_csr & HS_CSR_LOO) {
	hs_csr &= ~HS_CSR_LOO;
	if (pci_bus_write_config_word(slot->bus,
	slot->devfn,
	hs_cap + 2,
	hs_csr)) {
	err("Could not clear LOO for slot %s",
	hotplug_slot_name(slot->hotplug_slot));
	return -ENODEV;
	}
	}
	return 0;
	}


	/*
	* Device configuration functions
	*/

	int cpci_configure_slot(struct slot *slot)
	{
	struct pci_dev *dev;
	struct pci_bus *parent;
	int ret = 0;

	dbg("%s - enter", __func__);

	pci_lock_rescan_remove();

	if (slot->dev == NULL) {
	dbg("pci_dev null, finding %02x:%02x:%x",
	slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
	slot->dev = pci_get_slot(slot->bus, slot->devfn);
	}

	/* Still NULL? Well then scan for it! */
	if (slot->dev == NULL) {
	int n;
	dbg("pci_dev still null");

	/*
	* This will generate pci_dev structures for all functions, but
	* we will only call this case when lookup fails.
	*/
	n = pci_scan_slot(slot->bus, slot->devfn);
	dbg("%s: pci_scan_slot returned %d", __func__, n);
	slot->dev = pci_get_slot(slot->bus, slot->devfn);
	if (slot->dev == NULL) {
	err("Could not find PCI device for slot %02x", slot->number);
	ret = -ENODEV;
	goto out;
	}
	}
	parent = slot->dev->bus;

	list_for_each_entry(dev, &parent->devices, bus_list) {
	if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
	continue;
	if (pci_is_bridge(dev))
	pci_hp_add_bridge(dev);
	}


	pci_assign_unassigned_bridge_resources(parent->self);

	pci_bus_add_devices(parent);

	out:
	pci_unlock_rescan_remove();
	dbg("%s - exit", __func__);
	return ret;
	}

	int cpci_unconfigure_slot(struct slot *slot)
	{
	struct pci_dev dev, temp;

	dbg("%s - enter", __func__);
	if (!slot->dev) {
	err("No device for slot %02x\n", slot->number);
	return -ENODEV;
	}

	pci_lock_rescan_remove();

	list_for_each_entry_safe(dev, temp, &slot->bus->devices, bus_list) {
	if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
	continue;
	pci_dev_get(dev);
	pci_stop_and_remove_bus_device(dev);
	pci_dev_put(dev);
	}
	pci_dev_put(slot->dev);
	slot->dev = NULL;

	pci_unlock_rescan_remove();

	dbg("%s - exit", __func__);
	return 0;
	}