[mirror_ubuntu-bionic-kernel.git] / drivers / pci / hotplug / shpchp_pci.c

/*
 * Standard Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001 IBM Corp.
 * Copyright (C) 2003-2004 Intel Corporation
 *
 * 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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include "../pci.h"
#include "shpchp.h"

static void program_fw_provided_values(struct pci_dev *dev)
{
	u16 pci_cmd, pci_bctl;
	struct pci_dev *cdev;
	struct hotplug_params hpp;

	/* Program hpp values for this device */
	if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
			(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
			(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
		return;

	/* use default values if we can't get them from firmware */
	if (get_hp_params_from_firmware(dev, &hpp) ||
	    !hpp.t0 || (hpp.t0->revision > 1)) {
		printk(KERN_WARNING
		       "%s: Could not get hotplug parameters. Use defaults\n",
		       __func__);
		hpp.t0 = &hpp.type0_data;
		hpp.t0->revision = 0;
		hpp.t0->cache_line_size = 8;
		hpp.t0->latency_timer = 0x40;
		hpp.t0->enable_serr = 0;
		hpp.t0->enable_perr = 0;
	}

	pci_write_config_byte(dev,
			      PCI_CACHE_LINE_SIZE, hpp.t0->cache_line_size);
	pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.t0->latency_timer);
	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
	if (hpp.t0->enable_serr)
		pci_cmd |= PCI_COMMAND_SERR;
	else
		pci_cmd &= ~PCI_COMMAND_SERR;
	if (hpp.t0->enable_perr)
		pci_cmd |= PCI_COMMAND_PARITY;
	else
		pci_cmd &= ~PCI_COMMAND_PARITY;
	pci_write_config_word(dev, PCI_COMMAND, pci_cmd);

	/* Program bridge control value and child devices */
	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
		pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
				hpp.t0->latency_timer);
		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
		if (hpp.t0->enable_serr)
			pci_bctl |= PCI_BRIDGE_CTL_SERR;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
		if (hpp.t0->enable_perr)
			pci_bctl |= PCI_BRIDGE_CTL_PARITY;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
		pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
		if (dev->subordinate) {
			list_for_each_entry(cdev, &dev->subordinate->devices,
					bus_list)
				program_fw_provided_values(cdev);
		}
	}
}

int __ref shpchp_configure_device(struct slot *p_slot)
{
	struct pci_dev *dev;
	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
	int num, fn;

	dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
	if (dev) {
		err("Device %s already exists at %x:%x, cannot hot-add\n",
				pci_name(dev), p_slot->bus, p_slot->device);
		pci_dev_put(dev);
		return -EINVAL;
	}

	num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
	if (num == 0) {
		err("No new device found\n");
		return -ENODEV;
	}

	for (fn = 0; fn < 8; fn++) {
		dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
		if (!dev)
			continue;
		if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
			err("Cannot hot-add display device %s\n",
					pci_name(dev));
			pci_dev_put(dev);
			continue;
		}
		if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
				(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
			/* Find an unused bus number for the new bridge */
			struct pci_bus *child;
			unsigned char busnr, start = parent->secondary;
			unsigned char end = parent->subordinate;
			for (busnr = start; busnr <= end; busnr++) {
				if (!pci_find_bus(pci_domain_nr(parent),
							busnr))
					break;
			}
			if (busnr >= end) {
				err("No free bus for hot-added bridge\n");
				pci_dev_put(dev);
				continue;
			}
			child = pci_add_new_bus(parent, dev, busnr);
			if (!child) {
				err("Cannot add new bus for %s\n",
						pci_name(dev));
				pci_dev_put(dev);
				continue;
			}
			child->subordinate = pci_do_scan_bus(child);
			pci_bus_size_bridges(child);
		}
		program_fw_provided_values(dev);
		pci_dev_put(dev);
	}

	pci_bus_assign_resources(parent);
	pci_bus_add_devices(parent);
	pci_enable_bridges(parent);
	return 0;
}

int shpchp_unconfigure_device(struct slot *p_slot)
{
	int rc = 0;
	int j;
	u8 bctl = 0;
	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;

	dbg("%s: bus/dev = %x/%x\n", __func__, p_slot->bus, p_slot->device);

	for (j=0; j<8 ; j++) {
		struct pci_dev* temp = pci_get_slot(parent,
				(p_slot->device << 3) | j);
		if (!temp)
			continue;
		if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
			err("Cannot remove display device %s\n",
					pci_name(temp));
			pci_dev_put(temp);
			continue;
		}
		if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
			pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
			if (bctl & PCI_BRIDGE_CTL_VGA) {
				err("Cannot remove display device %s\n",
						pci_name(temp));
				pci_dev_put(temp);
				continue;
			}
		}
		pci_remove_bus_device(temp);
		pci_dev_put(temp);
	}
	return rc;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Standard Hot Plug Controller Driver
	3	*
	4	* Copyright (C) 1995,2001 Compaq Computer Corporation
	5	* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
	6	* Copyright (C) 2001 IBM Corp.
	7	* Copyright (C) 2003-2004 Intel Corporation
	8	*
	9	* All rights reserved.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or (at
	14	* your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful, but
	17	* WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	19	* NON INFRINGEMENT. See the GNU General Public License for more
	20	* details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	25	*
8cf4c195	26	* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
1da177e4 LT	27	*
	28	*/
	29
1da177e4 LT	30	#include <linux/module.h>
	31	#include <linux/kernel.h>
	32	#include <linux/types.h>
1da177e4 LT	33	#include <linux/pci.h>
	34	#include "../pci.h"
	35	#include "shpchp.h"
1da177e4	36
48b19148	37	static void program_fw_provided_values(struct pci_dev *dev)
424600f9 RS	38	{
	39	u16 pci_cmd, pci_bctl;
	40	struct pci_dev *cdev;
783c49fc	41	struct hotplug_params hpp;
424600f9 RS	42
	43	/* Program hpp values for this device */
	44	if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL \|\|
	45	(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
	46	(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
	47	return;
	48
783c49fc	49	/* use default values if we can't get them from firmware */
e22b7350 KK	50	if (get_hp_params_from_firmware(dev, &hpp) \|\|
	51	!hpp.t0 \|\| (hpp.t0->revision > 1)) {
	52	printk(KERN_WARNING
	53	"%s: Could not get hotplug parameters. Use defaults\n",
66bef8c0	54	__func__);
e22b7350 KK	55	hpp.t0 = &hpp.type0_data;
	56	hpp.t0->revision = 0;
	57	hpp.t0->cache_line_size = 8;
	58	hpp.t0->latency_timer = 0x40;
	59	hpp.t0->enable_serr = 0;
	60	hpp.t0->enable_perr = 0;
783c49fc	61	}
424600f9	62
e22b7350 KK	63	pci_write_config_byte(dev,
	64	PCI_CACHE_LINE_SIZE, hpp.t0->cache_line_size);
	65	pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.t0->latency_timer);
424600f9	66	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
e22b7350	67	if (hpp.t0->enable_serr)
424600f9 RS	68	pci_cmd \|= PCI_COMMAND_SERR;
	69	else
	70	pci_cmd &= ~PCI_COMMAND_SERR;
e22b7350	71	if (hpp.t0->enable_perr)
424600f9 RS	72	pci_cmd \|= PCI_COMMAND_PARITY;
	73	else
	74	pci_cmd &= ~PCI_COMMAND_PARITY;
	75	pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
	76
	77	/* Program bridge control value and child devices */
	78	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
	79	pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
e22b7350	80	hpp.t0->latency_timer);
424600f9	81	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
e22b7350	82	if (hpp.t0->enable_serr)
424600f9 RS	83	pci_bctl \|= PCI_BRIDGE_CTL_SERR;
	84	else
	85	pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
e22b7350	86	if (hpp.t0->enable_perr)
424600f9 RS	87	pci_bctl \|= PCI_BRIDGE_CTL_PARITY;
	88	else
	89	pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
	90	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
	91	if (dev->subordinate) {
	92	list_for_each_entry(cdev, &dev->subordinate->devices,
	93	bus_list)
	94	program_fw_provided_values(cdev);
	95	}
	96	}
	97	}
	98
0ab2b57f	99	int __ref shpchp_configure_device(struct slot *p_slot)
1da177e4	100	{
dbd7a788 RS	101	struct pci_dev *dev;
	102	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
	103	int num, fn;
	104
e00e57ef	105	dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
dbd7a788 RS	106	if (dev) {
	107	err("Device %s already exists at %x:%x, cannot hot-add\n",
	108	pci_name(dev), p_slot->bus, p_slot->device);
e00e57ef	109	pci_dev_put(dev);
dbd7a788	110	return -EINVAL;
1da177e4 LT	111	}
1da177e4 LT	112
dbd7a788 RS	113	num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
	114	if (num == 0) {
	115	err("No new device found\n");
	116	return -ENODEV;
	117	}
1da177e4	118
dbd7a788	119	for (fn = 0; fn < 8; fn++) {
e00e57ef KK	120	dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
e00e57ef KK	121	if (!dev)
dbd7a788 RS	122	continue;
	123	if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
	124	err("Cannot hot-add display device %s\n",
	125	pci_name(dev));
e00e57ef	126	pci_dev_put(dev);
dbd7a788 RS	127	continue;
	128	}
	129	if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) \|\|
	130	(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
	131	/* Find an unused bus number for the new bridge */
	132	struct pci_bus *child;
	133	unsigned char busnr, start = parent->secondary;
	134	unsigned char end = parent->subordinate;
	135	for (busnr = start; busnr <= end; busnr++) {
	136	if (!pci_find_bus(pci_domain_nr(parent),
	137	busnr))
	138	break;
	139	}
	140	if (busnr >= end) {
	141	err("No free bus for hot-added bridge\n");
e00e57ef	142	pci_dev_put(dev);
dbd7a788 RS	143	continue;
	144	}
	145	child = pci_add_new_bus(parent, dev, busnr);
	146	if (!child) {
	147	err("Cannot add new bus for %s\n",
	148	pci_name(dev));
e00e57ef	149	pci_dev_put(dev);
dbd7a788 RS	150	continue;
	151	}
	152	child->subordinate = pci_do_scan_bus(child);
	153	pci_bus_size_bridges(child);
	154	}
424600f9	155	program_fw_provided_values(dev);
e00e57ef	156	pci_dev_put(dev);
1da177e4 LT	157	}
1da177e4 LT	158
dbd7a788 RS	159	pci_bus_assign_resources(parent);
	160	pci_bus_add_devices(parent);
	161	pci_enable_bridges(parent);
1da177e4 LT	162	return 0;
	163	}
	164
2178bfad	165	int shpchp_unconfigure_device(struct slot *p_slot)
1da177e4 LT	166	{
	167	int rc = 0;
	168	int j;
2178bfad	169	u8 bctl = 0;
e00e57ef KK	170	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
e00e57ef KK	171
66bef8c0	172	dbg("%s: bus/dev = %x/%x\n", __func__, p_slot->bus, p_slot->device);
1da177e4 LT	173
1da177e4 LT	174	for (j=0; j<8 ; j++) {
e00e57ef	175	struct pci_dev* temp = pci_get_slot(parent,
2178bfad RS	176	(p_slot->device << 3) \| j);
	177	if (!temp)
	178	continue;
	179	if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
	180	err("Cannot remove display device %s\n",
	181	pci_name(temp));
e00e57ef	182	pci_dev_put(temp);
2178bfad RS	183	continue;
	184	}
	185	if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
	186	pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
	187	if (bctl & PCI_BRIDGE_CTL_VGA) {
	188	err("Cannot remove display device %s\n",
	189	pci_name(temp));
e00e57ef	190	pci_dev_put(temp);
2178bfad RS	191	continue;
2178bfad RS	192	}
1da177e4	193	}
2178bfad	194	pci_remove_bus_device(temp);
e00e57ef	195	pci_dev_put(temp);
1da177e4 LT	196	}
	197	return rc;
	198	}
	199