[deliverable/linux.git] / arch / ppc64 / kernel / pci_dn.c

/*
 * pci_dn.c
 *
 * Copyright (C) 2001 Todd Inglett, IBM Corporation
 *
 * PCI manipulation via device_nodes.
 *
 * 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.  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/bootmem.h>

#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/pSeries_reconfig.h>

#include "pci.h"

/*
 * Traverse_func that inits the PCI fields of the device node.
 * NOTE: this *must* be done before read/write config to the device.
 */
static void * __devinit update_dn_pci_info(struct device_node *dn, void *data)
{
	struct pci_controller *phb = data;
	int *type = (int *)get_property(dn, "ibm,pci-config-space-type", NULL);
	u32 *regs;
	struct pci_dn *pdn;

	if (phb->is_dynamic)
		pdn = kmalloc(sizeof(*pdn), GFP_KERNEL);
	else
		pdn = alloc_bootmem(sizeof(*pdn));
	if (pdn == NULL)
		return NULL;
	memset(pdn, 0, sizeof(*pdn));
	dn->data = pdn;
	pdn->node = dn;
	pdn->phb = phb;
	regs = (u32 *)get_property(dn, "reg", NULL);
	if (regs) {
		/* First register entry is addr (00BBSS00)  */
		pdn->busno = (regs[0] >> 16) & 0xff;
		pdn->devfn = (regs[0] >> 8) & 0xff;
	}

	pdn->pci_ext_config_space = (type && *type == 1);
	return NULL;
}

/*
 * Traverse a device tree stopping each PCI device in the tree.
 * This is done depth first.  As each node is processed, a "pre"
 * function is called and the children are processed recursively.
 *
 * The "pre" func returns a value.  If non-zero is returned from
 * the "pre" func, the traversal stops and this value is returned.
 * This return value is useful when using traverse as a method of
 * finding a device.
 *
 * NOTE: we do not run the func for devices that do not appear to
 * be PCI except for the start node which we assume (this is good
 * because the start node is often a phb which may be missing PCI
 * properties).
 * We use the class-code as an indicator. If we run into
 * one of these nodes we also assume its siblings are non-pci for
 * performance.
 */
void *traverse_pci_devices(struct device_node *start, traverse_func pre,
		void *data)
{
	struct device_node *dn, *nextdn;
	void *ret;

	/* We started with a phb, iterate all childs */
	for (dn = start->child; dn; dn = nextdn) {
		u32 *classp, class;

		nextdn = NULL;
		classp = (u32 *)get_property(dn, "class-code", NULL);
		class = classp ? *classp : 0;

		if (pre && ((ret = pre(dn, data)) != NULL))
			return ret;

		/* If we are a PCI bridge, go down */
		if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
				  (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
			/* Depth first...do children */
			nextdn = dn->child;
		else if (dn->sibling)
			/* ok, try next sibling instead. */
			nextdn = dn->sibling;
		if (!nextdn) {
			/* Walk up to next valid sibling. */
			do {
				dn = dn->parent;
				if (dn == start)
					return NULL;
			} while (dn->sibling == NULL);
			nextdn = dn->sibling;
		}
	}
	return NULL;
}

void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb)
{
	struct device_node * dn = (struct device_node *) phb->arch_data;
	struct pci_dn *pdn;

	/* PHB nodes themselves must not match */
	update_dn_pci_info(dn, phb);
	pdn = dn->data;
	if (pdn) {
		pdn->devfn = pdn->busno = -1;
		pdn->phb = phb;
	}

	/* Update dn->phb ptrs for new phb and children devices */
	traverse_pci_devices(dn, update_dn_pci_info, phb);
}

/*
 * Traversal func that looks for a <busno,devfcn> value.
 * If found, the pci_dn is returned (thus terminating the traversal).
 */
static void *is_devfn_node(struct device_node *dn, void *data)
{
	int busno = ((unsigned long)data >> 8) & 0xff;
	int devfn = ((unsigned long)data) & 0xff;
	struct pci_dn *pci = dn->data;

	if (pci && (devfn == pci->devfn) && (busno == pci->busno))
		return dn;
	return NULL;
}

/*
 * This is the "slow" path for looking up a device_node from a
 * pci_dev.  It will hunt for the device under its parent's
 * phb and then update sysdata for a future fastpath.
 *
 * It may also do fixups on the actual device since this happens
 * on the first read/write.
 *
 * Note that it also must deal with devices that don't exist.
 * In this case it may probe for real hardware ("just in case")
 * and add a device_node to the device tree if necessary.
 *
 */
struct device_node *fetch_dev_dn(struct pci_dev *dev)
{
	struct device_node *orig_dn = dev->sysdata;
	struct device_node *dn;
	unsigned long searchval = (dev->bus->number << 8) | dev->devfn;

	dn = traverse_pci_devices(orig_dn, is_devfn_node, (void *)searchval);
	if (dn)
		dev->sysdata = dn;
	return dn;
}
EXPORT_SYMBOL(fetch_dev_dn);

static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
{
	struct device_node *np = node;
	struct pci_dn *pci;
	int err = NOTIFY_OK;

	switch (action) {
	case PSERIES_RECONFIG_ADD:
		pci = np->parent->data;
		update_dn_pci_info(np, pci->phb);
		break;
	default:
		err = NOTIFY_DONE;
		break;
	}
	return err;
}

static struct notifier_block pci_dn_reconfig_nb = {
	.notifier_call = pci_dn_reconfig_notifier,
};

/*
 * Actually initialize the phbs.
 * The buswalk on this phb has not happened yet.
 */
void __init pci_devs_phb_init(void)
{
	struct pci_controller *phb, *tmp;

	/* This must be done first so the device nodes have valid pci info! */
	list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
		pci_devs_phb_init_dynamic(phb);

	pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* pci_dn.c
	3	*
	4	* Copyright (C) 2001 Todd Inglett, IBM Corporation
	5	*
	6	* PCI manipulation via device_nodes.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22	#include <linux/kernel.h>
	23	#include <linux/pci.h>
	24	#include <linux/string.h>
	25	#include <linux/init.h>
1635317f PM	26	#include <linux/slab.h>
1635317f PM	27	#include <linux/bootmem.h>
1da177e4 LT	28
	29	#include <asm/io.h>
	30	#include <asm/prom.h>
	31	#include <asm/pci-bridge.h>
	32	#include <asm/pSeries_reconfig.h>
	33
	34	#include "pci.h"
	35
	36	/*
	37	* Traverse_func that inits the PCI fields of the device node.
	38	* NOTE: this must be done before read/write config to the device.
	39	*/
	40	static void * __devinit update_dn_pci_info(struct device_node dn, void data)
	41	{
	42	struct pci_controller *phb = data;
	43	int type = (int )get_property(dn, "ibm,pci-config-space-type", NULL);
	44	u32 *regs;
1635317f PM	45	struct pci_dn *pdn;
	46
	47	if (phb->is_dynamic)
	48	pdn = kmalloc(sizeof(*pdn), GFP_KERNEL);
	49	else
	50	pdn = alloc_bootmem(sizeof(*pdn));
	51	if (pdn == NULL)
	52	return NULL;
	53	memset(pdn, 0, sizeof(*pdn));
	54	dn->data = pdn;
	55	pdn->node = dn;
	56	pdn->phb = phb;
1da177e4 LT	57	regs = (u32 *)get_property(dn, "reg", NULL);
	58	if (regs) {
	59	/* First register entry is addr (00BBSS00) */
1635317f PM	60	pdn->busno = (regs[0] >> 16) & 0xff;
1635317f PM	61	pdn->devfn = (regs[0] >> 8) & 0xff;
1da177e4 LT	62	}
1da177e4 LT	63
1635317f	64	pdn->pci_ext_config_space = (type && *type == 1);
1da177e4 LT	65	return NULL;
	66	}
	67
	68	/*
	69	* Traverse a device tree stopping each PCI device in the tree.
	70	* This is done depth first. As each node is processed, a "pre"
	71	* function is called and the children are processed recursively.
	72	*
	73	* The "pre" func returns a value. If non-zero is returned from
	74	* the "pre" func, the traversal stops and this value is returned.
	75	* This return value is useful when using traverse as a method of
	76	* finding a device.
	77	*
	78	* NOTE: we do not run the func for devices that do not appear to
	79	* be PCI except for the start node which we assume (this is good
	80	* because the start node is often a phb which may be missing PCI
	81	* properties).
	82	* We use the class-code as an indicator. If we run into
	83	* one of these nodes we also assume its siblings are non-pci for
	84	* performance.
	85	*/
	86	void traverse_pci_devices(struct device_node start, traverse_func pre,
	87	void *data)
	88	{
	89	struct device_node dn, nextdn;
	90	void *ret;
	91
	92	/* We started with a phb, iterate all childs */
	93	for (dn = start->child; dn; dn = nextdn) {
	94	u32 *classp, class;
	95
	96	nextdn = NULL;
	97	classp = (u32 *)get_property(dn, "class-code", NULL);
	98	class = classp ? *classp : 0;
	99
	100	if (pre && ((ret = pre(dn, data)) != NULL))
	101	return ret;
	102
	103	/* If we are a PCI bridge, go down */
	104	if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI \|\|
	105	(class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
	106	/* Depth first...do children */
	107	nextdn = dn->child;
	108	else if (dn->sibling)
	109	/* ok, try next sibling instead. */
	110	nextdn = dn->sibling;
	111	if (!nextdn) {
	112	/* Walk up to next valid sibling. */
	113	do {
	114	dn = dn->parent;
	115	if (dn == start)
	116	return NULL;
	117	} while (dn->sibling == NULL);
	118	nextdn = dn->sibling;
	119	}
	120	}
	121	return NULL;
	122	}
	123
	124	void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb)
	125	{
	126	struct device_node * dn = (struct device_node *) phb->arch_data;
1635317f	127	struct pci_dn *pdn;
1da177e4 LT	128
1da177e4 LT	129	/* PHB nodes themselves must not match */
1635317f PM	130	update_dn_pci_info(dn, phb);
	131	pdn = dn->data;
	132	if (pdn) {
	133	pdn->devfn = pdn->busno = -1;
	134	pdn->phb = phb;
	135	}
1da177e4 LT	136
	137	/* Update dn->phb ptrs for new phb and children devices */
	138	traverse_pci_devices(dn, update_dn_pci_info, phb);
	139	}
	140
	141	/*
	142	* Traversal func that looks for a <busno,devfcn> value.
1635317f	143	* If found, the pci_dn is returned (thus terminating the traversal).
1da177e4 LT	144	*/
	145	static void is_devfn_node(struct device_node dn, void *data)
	146	{
	147	int busno = ((unsigned long)data >> 8) & 0xff;
	148	int devfn = ((unsigned long)data) & 0xff;
1635317f	149	struct pci_dn *pci = dn->data;
1da177e4	150
1635317f PM	151	if (pci && (devfn == pci->devfn) && (busno == pci->busno))
	152	return dn;
	153	return NULL;
1da177e4 LT	154	}
	155
	156	/*
	157	* This is the "slow" path for looking up a device_node from a
	158	* pci_dev. It will hunt for the device under its parent's
	159	* phb and then update sysdata for a future fastpath.
	160	*
	161	* It may also do fixups on the actual device since this happens
	162	* on the first read/write.
	163	*
	164	* Note that it also must deal with devices that don't exist.
	165	* In this case it may probe for real hardware ("just in case")
	166	* and add a device_node to the device tree if necessary.
	167	*
	168	*/
	169	struct device_node fetch_dev_dn(struct pci_dev dev)
	170	{
	171	struct device_node *orig_dn = dev->sysdata;
1da177e4 LT	172	struct device_node *dn;
	173	unsigned long searchval = (dev->bus->number << 8) \| dev->devfn;
	174
1635317f	175	dn = traverse_pci_devices(orig_dn, is_devfn_node, (void *)searchval);
1da177e4 LT	176	if (dn)
	177	dev->sysdata = dn;
	178	return dn;
	179	}
	180	EXPORT_SYMBOL(fetch_dev_dn);
	181
	182	static int pci_dn_reconfig_notifier(struct notifier_block nb, unsigned long action, void node)
	183	{
	184	struct device_node *np = node;
1635317f	185	struct pci_dn *pci;
1da177e4 LT	186	int err = NOTIFY_OK;
	187
	188	switch (action) {
	189	case PSERIES_RECONFIG_ADD:
1635317f PM	190	pci = np->parent->data;
1635317f PM	191	update_dn_pci_info(np, pci->phb);
1da177e4 LT	192	break;
	193	default:
	194	err = NOTIFY_DONE;
	195	break;
	196	}
	197	return err;
	198	}
	199
	200	static struct notifier_block pci_dn_reconfig_nb = {
	201	.notifier_call = pci_dn_reconfig_notifier,
	202	};
	203
	204	/*
	205	* Actually initialize the phbs.
	206	* The buswalk on this phb has not happened yet.
	207	*/
	208	void __init pci_devs_phb_init(void)
	209	{
	210	struct pci_controller phb, tmp;
	211
	212	/* This must be done first so the device nodes have valid pci info! */
	213	list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
	214	pci_devs_phb_init_dynamic(phb);
	215
	216	pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
	217	}