[linux-2.6-block.git] / arch / ppc64 / kernel / rtas_pci.c

/*
 * arch/ppc64/kernel/rtas_pci.c
 *
 * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
 *
 * RTAS specific routines for PCI.
 * 
 * Based on code from pci.c, chrp_pci.c and pSeries_pci.c
 *
 * 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/threads.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <asm/iommu.h>
#include <asm/rtas.h>
#include <asm/mpic.h>
#include <asm/ppc-pci.h>

/* RTAS tokens */
static int read_pci_config;
static int write_pci_config;
static int ibm_read_pci_config;
static int ibm_write_pci_config;

static int config_access_valid(struct pci_dn *dn, int where)
{
	if (where < 256)
		return 1;
	if (where < 4096 && dn->pci_ext_config_space)
		return 1;

	return 0;
}

static int of_device_available(struct device_node * dn)
{
        char * status;

        status = get_property(dn, "status", NULL);

        if (!status)
                return 1;

        if (!strcmp(status, "okay"))
                return 1;

        return 0;
}

static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
{
	int returnval = -1;
	unsigned long buid, addr;
	int ret;
	struct pci_dn *pdn;

	if (!dn || !dn->data)
		return PCIBIOS_DEVICE_NOT_FOUND;
	pdn = dn->data;
	if (!config_access_valid(pdn, where))
		return PCIBIOS_BAD_REGISTER_NUMBER;

	addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
		(pdn->devfn << 8) | (where & 0xff);
	buid = pdn->phb->buid;
	if (buid) {
		ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
				addr, buid >> 32, buid & 0xffffffff, size);
	} else {
		ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
	}
	*val = returnval;

	if (ret)
		return PCIBIOS_DEVICE_NOT_FOUND;

	if (returnval == EEH_IO_ERROR_VALUE(size) &&
	    eeh_dn_check_failure (dn, NULL))
		return PCIBIOS_DEVICE_NOT_FOUND;

	return PCIBIOS_SUCCESSFUL;
}

static int rtas_pci_read_config(struct pci_bus *bus,
				unsigned int devfn,
				int where, int size, u32 *val)
{
	struct device_node *busdn, *dn;

	if (bus->self)
		busdn = pci_device_to_OF_node(bus->self);
	else
		busdn = bus->sysdata;	/* must be a phb */

	/* Search only direct children of the bus */
	for (dn = busdn->child; dn; dn = dn->sibling)
		if (dn->data && PCI_DN(dn)->devfn == devfn
		    && of_device_available(dn))
			return rtas_read_config(dn, where, size, val);

	return PCIBIOS_DEVICE_NOT_FOUND;
}

int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
{
	unsigned long buid, addr;
	int ret;
	struct pci_dn *pdn;

	if (!dn || !dn->data)
		return PCIBIOS_DEVICE_NOT_FOUND;
	pdn = dn->data;
	if (!config_access_valid(pdn, where))
		return PCIBIOS_BAD_REGISTER_NUMBER;

	addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
		(pdn->devfn << 8) | (where & 0xff);
	buid = pdn->phb->buid;
	if (buid) {
		ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
	} else {
		ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
	}

	if (ret)
		return PCIBIOS_DEVICE_NOT_FOUND;

	return PCIBIOS_SUCCESSFUL;
}

static int rtas_pci_write_config(struct pci_bus *bus,
				 unsigned int devfn,
				 int where, int size, u32 val)
{
	struct device_node *busdn, *dn;

	if (bus->self)
		busdn = pci_device_to_OF_node(bus->self);
	else
		busdn = bus->sysdata;	/* must be a phb */

	/* Search only direct children of the bus */
	for (dn = busdn->child; dn; dn = dn->sibling)
		if (dn->data && PCI_DN(dn)->devfn == devfn
		    && of_device_available(dn))
			return rtas_write_config(dn, where, size, val);
	return PCIBIOS_DEVICE_NOT_FOUND;
}

struct pci_ops rtas_pci_ops = {
	rtas_pci_read_config,
	rtas_pci_write_config
};

int is_python(struct device_node *dev)
{
	char *model = (char *)get_property(dev, "model", NULL);

	if (model && strstr(model, "Python"))
		return 1;

	return 0;
}

static int get_phb_reg_prop(struct device_node *dev,
			    unsigned int addr_size_words,
			    struct reg_property64 *reg)
{
	unsigned int *ui_ptr = NULL, len;

	/* Found a PHB, now figure out where his registers are mapped. */
	ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
	if (ui_ptr == NULL)
		return 1;

	if (addr_size_words == 1) {
		reg->address = ((struct reg_property32 *)ui_ptr)->address;
		reg->size    = ((struct reg_property32 *)ui_ptr)->size;
	} else {
		*reg = *((struct reg_property64 *)ui_ptr);
	}

	return 0;
}

static void python_countermeasures(struct device_node *dev,
				   unsigned int addr_size_words)
{
	struct reg_property64 reg_struct;
	void __iomem *chip_regs;
	volatile u32 val;

	if (get_phb_reg_prop(dev, addr_size_words, &reg_struct))
		return;

	/* Python's register file is 1 MB in size. */
	chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);

	/* 
	 * Firmware doesn't always clear this bit which is critical
	 * for good performance - Anton
	 */

#define PRG_CL_RESET_VALID 0x00010000

	val = in_be32(chip_regs + 0xf6030);
	if (val & PRG_CL_RESET_VALID) {
		printk(KERN_INFO "Python workaround: ");
		val &= ~PRG_CL_RESET_VALID;
		out_be32(chip_regs + 0xf6030, val);
		/*
		 * We must read it back for changes to
		 * take effect
		 */
		val = in_be32(chip_regs + 0xf6030);
		printk("reg0: %x\n", val);
	}

	iounmap(chip_regs);
}

void __init init_pci_config_tokens (void)
{
	read_pci_config = rtas_token("read-pci-config");
	write_pci_config = rtas_token("write-pci-config");
	ibm_read_pci_config = rtas_token("ibm,read-pci-config");
	ibm_write_pci_config = rtas_token("ibm,write-pci-config");
}

unsigned long __devinit get_phb_buid (struct device_node *phb)
{
	int addr_cells;
	unsigned int *buid_vals;
	unsigned int len;
	unsigned long buid;

	if (ibm_read_pci_config == -1) return 0;

	/* PHB's will always be children of the root node,
	 * or so it is promised by the current firmware. */
	if (phb->parent == NULL)
		return 0;
	if (phb->parent->parent)
		return 0;

	buid_vals = (unsigned int *) get_property(phb, "reg", &len);
	if (buid_vals == NULL)
		return 0;

	addr_cells = prom_n_addr_cells(phb);
	if (addr_cells == 1) {
		buid = (unsigned long) buid_vals[0];
	} else {
		buid = (((unsigned long)buid_vals[0]) << 32UL) |
			(((unsigned long)buid_vals[1]) & 0xffffffff);
	}
	return buid;
}

static int phb_set_bus_ranges(struct device_node *dev,
			      struct pci_controller *phb)
{
	int *bus_range;
	unsigned int len;

	bus_range = (int *) get_property(dev, "bus-range", &len);
	if (bus_range == NULL || len < 2 * sizeof(int)) {
		return 1;
 	}
 
	phb->first_busno =  bus_range[0];
	phb->last_busno  =  bus_range[1];

	return 0;
}

static int __devinit setup_phb(struct device_node *dev,
			       struct pci_controller *phb,
			       unsigned int addr_size_words)
{
	pci_setup_pci_controller(phb);

	if (is_python(dev))
		python_countermeasures(dev, addr_size_words);

	if (phb_set_bus_ranges(dev, phb))
		return 1;

	phb->arch_data = dev;
	phb->ops = &rtas_pci_ops;
	phb->buid = get_phb_buid(dev);

	return 0;
}

static void __devinit add_linux_pci_domain(struct device_node *dev,
					   struct pci_controller *phb,
					   struct property *of_prop)
{
	memset(of_prop, 0, sizeof(struct property));
	of_prop->name = "linux,pci-domain";
	of_prop->length = sizeof(phb->global_number);
	of_prop->value = (unsigned char *)&of_prop[1];
	memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
	prom_add_property(dev, of_prop);
}

static struct pci_controller * __init alloc_phb(struct device_node *dev,
						unsigned int addr_size_words)
{
	struct pci_controller *phb;
	struct property *of_prop;

	phb = alloc_bootmem(sizeof(struct pci_controller));
	if (phb == NULL)
		return NULL;

	of_prop = alloc_bootmem(sizeof(struct property) +
				sizeof(phb->global_number));
	if (!of_prop)
		return NULL;

	if (setup_phb(dev, phb, addr_size_words))
		return NULL;

	add_linux_pci_domain(dev, phb, of_prop);

	return phb;
}

static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
{
	struct pci_controller *phb;

	phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
					       GFP_KERNEL);
	if (phb == NULL)
		return NULL;

	if (setup_phb(dev, phb, addr_size_words))
		return NULL;

	phb->is_dynamic = 1;

	/* TODO: linux,pci-domain? */

 	return phb;
}

unsigned long __init find_and_init_phbs(void)
{
	struct device_node *node;
	struct pci_controller *phb;
	unsigned int root_size_cells = 0;
	unsigned int index;
	unsigned int *opprop = NULL;
	struct device_node *root = of_find_node_by_path("/");

	if (ppc64_interrupt_controller == IC_OPEN_PIC) {
		opprop = (unsigned int *)get_property(root,
				"platform-open-pic", NULL);
	}

	root_size_cells = prom_n_size_cells(root);

	index = 0;

	for (node = of_get_next_child(root, NULL);
	     node != NULL;
	     node = of_get_next_child(root, node)) {
		if (node->type == NULL || strcmp(node->type, "pci") != 0)
			continue;

		phb = alloc_phb(node, root_size_cells);
		if (!phb)
			continue;

		pci_process_bridge_OF_ranges(phb, node, 0);
		pci_setup_phb_io(phb, index == 0);
#ifdef CONFIG_PPC_PSERIES
		if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
			int addr = root_size_cells * (index + 2) - 1;
			mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
		}
#endif
		index++;
	}

	of_node_put(root);
	pci_devs_phb_init();

	/*
	 * pci_probe_only and pci_assign_all_buses can be set via properties
	 * in chosen.
	 */
	if (of_chosen) {
		int *prop;

		prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
					   NULL);
		if (prop)
			pci_probe_only = *prop;

		prop = (int *)get_property(of_chosen,
					   "linux,pci-assign-all-buses", NULL);
		if (prop)
			pci_assign_all_buses = *prop;
	}

	return 0;
}

struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
{
	struct device_node *root = of_find_node_by_path("/");
	unsigned int root_size_cells = 0;
	struct pci_controller *phb;
	struct pci_bus *bus;
	int primary;

	root_size_cells = prom_n_size_cells(root);

	primary = list_empty(&hose_list);
	phb = alloc_phb_dynamic(dn, root_size_cells);
	if (!phb)
		return NULL;

	pci_process_bridge_OF_ranges(phb, dn, primary);

	pci_setup_phb_io_dynamic(phb, primary);
	of_node_put(root);

	pci_devs_phb_init_dynamic(phb);
	phb->last_busno = 0xff;
	bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
	phb->bus = bus;
	phb->last_busno = bus->subordinate;

	return phb;
}
EXPORT_SYMBOL(init_phb_dynamic);

/* RPA-specific bits for removing PHBs */
int pcibios_remove_root_bus(struct pci_controller *phb)
{
	struct pci_bus *b = phb->bus;
	struct resource *res;
	int rc, i;

	res = b->resource[0];
	if (!res->flags) {
		printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
				b->name);
		return 1;
	}

	rc = unmap_bus_range(b);
	if (rc) {
		printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
			__FUNCTION__, b->name);
		return 1;
	}

	if (release_resource(res)) {
		printk(KERN_ERR "%s: failed to release IO on bus %s\n",
				__FUNCTION__, b->name);
		return 1;
	}

	for (i = 1; i < 3; ++i) {
		res = b->resource[i];
		if (!res->flags && i == 0) {
			printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
				__FUNCTION__, b->name);
			return 1;
		}
		if (res->flags && release_resource(res)) {
			printk(KERN_ERR
			       "%s: failed to release IO %d on bus %s\n",
				__FUNCTION__, i, b->name);
			return 1;
		}
	}

	list_del(&phb->list_node);
	if (phb->is_dynamic)
		kfree(phb);

	return 0;
}
EXPORT_SYMBOL(pcibios_remove_root_bus);
Commit	Line	Data
c5a3c2e5 AB	1	/*
	2	* arch/ppc64/kernel/rtas_pci.c
	3	*
	4	* Copyright (C) 2001 Dave Engebretsen, IBM Corporation
	5	* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
	6	*
	7	* RTAS specific routines for PCI.
	8	*
	9	* Based on code from pci.c, chrp_pci.c and pSeries_pci.c
	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
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/threads.h>
	28	#include <linux/pci.h>
	29	#include <linux/string.h>
	30	#include <linux/init.h>
	31	#include <linux/bootmem.h>
	32
	33	#include <asm/io.h>
	34	#include <asm/pgtable.h>
	35	#include <asm/irq.h>
	36	#include <asm/prom.h>
	37	#include <asm/machdep.h>
	38	#include <asm/pci-bridge.h>
	39	#include <asm/iommu.h>
	40	#include <asm/rtas.h>
bbeb3f4c	41	#include <asm/mpic.h>
d387899f	42	#include <asm/ppc-pci.h>
c5a3c2e5 AB	43
	44	/* RTAS tokens */
	45	static int read_pci_config;
	46	static int write_pci_config;
	47	static int ibm_read_pci_config;
	48	static int ibm_write_pci_config;
	49
1635317f	50	static int config_access_valid(struct pci_dn *dn, int where)
c5a3c2e5 AB	51	{
	52	if (where < 256)
	53	return 1;
	54	if (where < 4096 && dn->pci_ext_config_space)
	55	return 1;
	56
	57	return 0;
	58	}
	59
293da76b JM	60	static int of_device_available(struct device_node * dn)
	61	{
	62	char * status;
	63
	64	status = get_property(dn, "status", NULL);
	65
	66	if (!status)
	67	return 1;
	68
	69	if (!strcmp(status, "okay"))
	70	return 1;
	71
	72	return 0;
	73	}
	74
c5a3c2e5 AB	75	static int rtas_read_config(struct device_node dn, int where, int size, u32 val)
	76	{
	77	int returnval = -1;
	78	unsigned long buid, addr;
	79	int ret;
1635317f	80	struct pci_dn *pdn;
c5a3c2e5	81
1635317f	82	if (!dn \|\| !dn->data)
c5a3c2e5	83	return PCIBIOS_DEVICE_NOT_FOUND;
1635317f PM	84	pdn = dn->data;
1635317f PM	85	if (!config_access_valid(pdn, where))
c5a3c2e5 AB	86	return PCIBIOS_BAD_REGISTER_NUMBER;
c5a3c2e5 AB	87
1635317f PM	88	addr = ((where & 0xf00) << 20) \| (pdn->busno << 16) \|
	89	(pdn->devfn << 8) \| (where & 0xff);
	90	buid = pdn->phb->buid;
c5a3c2e5 AB	91	if (buid) {
	92	ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
	93	addr, buid >> 32, buid & 0xffffffff, size);
	94	} else {
	95	ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
	96	}
	97	*val = returnval;
	98
	99	if (ret)
	100	return PCIBIOS_DEVICE_NOT_FOUND;
	101
1635317f PM	102	if (returnval == EEH_IO_ERROR_VALUE(size) &&
1635317f PM	103	eeh_dn_check_failure (dn, NULL))
c5a3c2e5 AB	104	return PCIBIOS_DEVICE_NOT_FOUND;
	105
	106	return PCIBIOS_SUCCESSFUL;
	107	}
	108
	109	static int rtas_pci_read_config(struct pci_bus *bus,
	110	unsigned int devfn,
	111	int where, int size, u32 *val)
	112	{
	113	struct device_node busdn, dn;
	114
	115	if (bus->self)
	116	busdn = pci_device_to_OF_node(bus->self);
	117	else
	118	busdn = bus->sysdata; /* must be a phb */
	119
	120	/* Search only direct children of the bus */
	121	for (dn = busdn->child; dn; dn = dn->sibling)
1635317f PM	122	if (dn->data && PCI_DN(dn)->devfn == devfn
1635317f PM	123	&& of_device_available(dn))
c5a3c2e5	124	return rtas_read_config(dn, where, size, val);
1635317f	125
c5a3c2e5 AB	126	return PCIBIOS_DEVICE_NOT_FOUND;
	127	}
	128
1635317f	129	int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
c5a3c2e5 AB	130	{
	131	unsigned long buid, addr;
	132	int ret;
1635317f	133	struct pci_dn *pdn;
c5a3c2e5	134
1635317f	135	if (!dn \|\| !dn->data)
c5a3c2e5	136	return PCIBIOS_DEVICE_NOT_FOUND;
1635317f PM	137	pdn = dn->data;
1635317f PM	138	if (!config_access_valid(pdn, where))
c5a3c2e5 AB	139	return PCIBIOS_BAD_REGISTER_NUMBER;
c5a3c2e5 AB	140
1635317f PM	141	addr = ((where & 0xf00) << 20) \| (pdn->busno << 16) \|
	142	(pdn->devfn << 8) \| (where & 0xff);
	143	buid = pdn->phb->buid;
c5a3c2e5 AB	144	if (buid) {
	145	ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
	146	} else {
	147	ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
	148	}
	149
	150	if (ret)
	151	return PCIBIOS_DEVICE_NOT_FOUND;
	152
	153	return PCIBIOS_SUCCESSFUL;
	154	}
	155
	156	static int rtas_pci_write_config(struct pci_bus *bus,
	157	unsigned int devfn,
	158	int where, int size, u32 val)
	159	{
	160	struct device_node busdn, dn;
	161
	162	if (bus->self)
	163	busdn = pci_device_to_OF_node(bus->self);
	164	else
	165	busdn = bus->sysdata; /* must be a phb */
	166
	167	/* Search only direct children of the bus */
	168	for (dn = busdn->child; dn; dn = dn->sibling)
1635317f PM	169	if (dn->data && PCI_DN(dn)->devfn == devfn
1635317f PM	170	&& of_device_available(dn))
c5a3c2e5 AB	171	return rtas_write_config(dn, where, size, val);
	172	return PCIBIOS_DEVICE_NOT_FOUND;
	173	}
	174
	175	struct pci_ops rtas_pci_ops = {
	176	rtas_pci_read_config,
	177	rtas_pci_write_config
	178	};
	179
	180	int is_python(struct device_node *dev)
	181	{
	182	char model = (char )get_property(dev, "model", NULL);
	183
	184	if (model && strstr(model, "Python"))
	185	return 1;
	186
	187	return 0;
	188	}
	189
	190	static int get_phb_reg_prop(struct device_node *dev,
	191	unsigned int addr_size_words,
	192	struct reg_property64 *reg)
	193	{
	194	unsigned int *ui_ptr = NULL, len;
	195
	196	/* Found a PHB, now figure out where his registers are mapped. */
	197	ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
	198	if (ui_ptr == NULL)
	199	return 1;
	200
	201	if (addr_size_words == 1) {
	202	reg->address = ((struct reg_property32 *)ui_ptr)->address;
	203	reg->size = ((struct reg_property32 *)ui_ptr)->size;
	204	} else {
	205	reg = ((struct reg_property64 *)ui_ptr);
	206	}
	207
	208	return 0;
	209	}
	210
	211	static void python_countermeasures(struct device_node *dev,
	212	unsigned int addr_size_words)
	213	{
	214	struct reg_property64 reg_struct;
	215	void __iomem *chip_regs;
	216	volatile u32 val;
	217
	218	if (get_phb_reg_prop(dev, addr_size_words, &reg_struct))
	219	return;
	220
	221	/* Python's register file is 1 MB in size. */
	222	chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
	223
	224	/*
	225	* Firmware doesn't always clear this bit which is critical
	226	* for good performance - Anton
	227	*/
	228
	229	#define PRG_CL_RESET_VALID 0x00010000
	230
	231	val = in_be32(chip_regs + 0xf6030);
	232	if (val & PRG_CL_RESET_VALID) {
	233	printk(KERN_INFO "Python workaround: ");
	234	val &= ~PRG_CL_RESET_VALID;
235	out_be32(chip_regs + 0xf6030, val);
236	/*
237	* We must read it back for changes to
238	* take effect
239	*/
240	val = in_be32(chip_regs + 0xf6030);
241	printk("reg0: %x\n", val);
242	}
243
244	iounmap(chip_regs);
245	}
246
247	void __init init_pci_config_tokens (void)
248	{
249	read_pci_config = rtas_token("read-pci-config");
250	write_pci_config = rtas_token("write-pci-config");
251	ibm_read_pci_config = rtas_token("ibm,read-pci-config");
252	ibm_write_pci_config = rtas_token("ibm,write-pci-config");
253	}
254
255	unsigned long __devinit get_phb_buid (struct device_node *phb)
256	{
257	int addr_cells;
258	unsigned int *buid_vals;
259	unsigned int len;
260	unsigned long buid;
261
262	if (ibm_read_pci_config == -1) return 0;
263
264	/* PHB's will always be children of the root node,
265	* or so it is promised by the current firmware. */
266	if (phb->parent == NULL)
267	return 0;
268	if (phb->parent->parent)
269	return 0;
270
271	buid_vals = (unsigned int *) get_property(phb, "reg", &len);
272	if (buid_vals == NULL)
273	return 0;
274
275	addr_cells = prom_n_addr_cells(phb);
276	if (addr_cells == 1) {
277	buid = (unsigned long) buid_vals[0];
278	} else {
279	buid = (((unsigned long)buid_vals[0]) << 32UL) \|
280	(((unsigned long)buid_vals[1]) & 0xffffffff);
281	}
282	return buid;
283	}
284
285	static int phb_set_bus_ranges(struct device_node *dev,
286	struct pci_controller *phb)
287	{
288	int *bus_range;
289	unsigned int len;
290
291	bus_range = (int *) get_property(dev, "bus-range", &len);
292	if (bus_range == NULL \|\| len < 2 * sizeof(int)) {
293	return 1;
294	}
295
296	phb->first_busno = bus_range[0];
297	phb->last_busno = bus_range[1];
298
299	return 0;
300	}
301
302	static int __devinit setup_phb(struct device_node *dev,
303	struct pci_controller *phb,
304	unsigned int addr_size_words)
305	{
306	pci_setup_pci_controller(phb);
307
308	if (is_python(dev))
309	python_countermeasures(dev, addr_size_words);
310
311	if (phb_set_bus_ranges(dev, phb))
312	return 1;
313
314	phb->arch_data = dev;
315	phb->ops = &rtas_pci_ops;
316	phb->buid = get_phb_buid(dev);
317
318	return 0;
319	}
320
321	static void __devinit add_linux_pci_domain(struct device_node *dev,
322	struct pci_controller *phb,
323	struct property *of_prop)
324	{
325	memset(of_prop, 0, sizeof(struct property));
326	of_prop->name = "linux,pci-domain";
327	of_prop->length = sizeof(phb->global_number);
328	of_prop->value = (unsigned char *)&of_prop[1];
329	memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
330	prom_add_property(dev, of_prop);
331	}
332
333	static struct pci_controller * __init alloc_phb(struct device_node *dev,
334	unsigned int addr_size_words)
335	{
336	struct pci_controller *phb;
337	struct property *of_prop;
338
339	phb = alloc_bootmem(sizeof(struct pci_controller));
340	if (phb == NULL)
341	return NULL;
342
343	of_prop = alloc_bootmem(sizeof(struct property) +
344	sizeof(phb->global_number));
345	if (!of_prop)
346	return NULL;
347
348	if (setup_phb(dev, phb, addr_size_words))
349	return NULL;
350
351	add_linux_pci_domain(dev, phb, of_prop);
352
353	return phb;
354	}
355
356	static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
357	{
358	struct pci_controller *phb;
359
360	phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
361	GFP_KERNEL);
362	if (phb == NULL)
363	return NULL;
364
365	if (setup_phb(dev, phb, addr_size_words))
366	return NULL;
367
368	phb->is_dynamic = 1;
369
370	/* TODO: linux,pci-domain? */
371
372	return phb;
373	}
374
375	unsigned long __init find_and_init_phbs(void)
376	{
377	struct device_node *node;
378	struct pci_controller *phb;
379	unsigned int root_size_cells = 0;
380	unsigned int index;
381	unsigned int *opprop = NULL;
382	struct device_node *root = of_find_node_by_path("/");
383
384	if (ppc64_interrupt_controller == IC_OPEN_PIC) {
385	opprop = (unsigned int *)get_property(root,
386	"platform-open-pic", NULL);
387	}
388
389	root_size_cells = prom_n_size_cells(root);
390
391	index = 0;
392
393	for (node = of_get_next_child(root, NULL);
394	node != NULL;
395	node = of_get_next_child(root, node)) {
396	if (node->type == NULL \|\| strcmp(node->type, "pci") != 0)
397	continue;
398
399	phb = alloc_phb(node, root_size_cells);
400	if (!phb)
401	continue;
402
f7abbc19	403	pci_process_bridge_OF_ranges(phb, node, 0);
c5a3c2e5 AB	404	pci_setup_phb_io(phb, index == 0);
	405	#ifdef CONFIG_PPC_PSERIES
	406	if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
	407	int addr = root_size_cells * (index + 2) - 1;
	408	mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
	409	}
	410	#endif
	411	index++;
	412	}
	413
	414	of_node_put(root);
	415	pci_devs_phb_init();
	416
	417	/*
	418	* pci_probe_only and pci_assign_all_buses can be set via properties
	419	* in chosen.
	420	*/
	421	if (of_chosen) {
	422	int *prop;
	423
	424	prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
	425	NULL);
	426	if (prop)
	427	pci_probe_only = *prop;
	428
	429	prop = (int *)get_property(of_chosen,
	430	"linux,pci-assign-all-buses", NULL);
	431	if (prop)
	432	pci_assign_all_buses = *prop;
	433	}
	434
	435	return 0;
	436	}
	437
	438	struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
	439	{
	440	struct device_node *root = of_find_node_by_path("/");
	441	unsigned int root_size_cells = 0;
	442	struct pci_controller *phb;
	443	struct pci_bus *bus;
	444	int primary;
	445
	446	root_size_cells = prom_n_size_cells(root);
	447
	448	primary = list_empty(&hose_list);
	449	phb = alloc_phb_dynamic(dn, root_size_cells);
	450	if (!phb)
	451	return NULL;
	452
f7abbc19	453	pci_process_bridge_OF_ranges(phb, dn, primary);
c5a3c2e5 AB	454
	455	pci_setup_phb_io_dynamic(phb, primary);
	456	of_node_put(root);
	457
	458	pci_devs_phb_init_dynamic(phb);
	459	phb->last_busno = 0xff;
	460	bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
	461	phb->bus = bus;
	462	phb->last_busno = bus->subordinate;
	463
	464	return phb;
	465	}
	466	EXPORT_SYMBOL(init_phb_dynamic);
	467
	468	/* RPA-specific bits for removing PHBs */
	469	int pcibios_remove_root_bus(struct pci_controller *phb)
	470	{
	471	struct pci_bus *b = phb->bus;
	472	struct resource *res;
	473	int rc, i;
	474
	475	res = b->resource[0];
	476	if (!res->flags) {
	477	printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
	478	b->name);
	479	return 1;
	480	}
	481
	482	rc = unmap_bus_range(b);
	483	if (rc) {
	484	printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
	485	__FUNCTION__, b->name);
	486	return 1;
	487	}
	488
	489	if (release_resource(res)) {
	490	printk(KERN_ERR "%s: failed to release IO on bus %s\n",
	491	__FUNCTION__, b->name);
	492	return 1;
	493	}
	494
	495	for (i = 1; i < 3; ++i) {
	496	res = b->resource[i];
	497	if (!res->flags && i == 0) {
	498	printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
	499	__FUNCTION__, b->name);
	500	return 1;
	501	}
	502	if (res->flags && release_resource(res)) {
	503	printk(KERN_ERR
	504	"%s: failed to release IO %d on bus %s\n",
	505	__FUNCTION__, i, b->name);
	506	return 1;
	507	}
	508	}
	509
	510	list_del(&phb->list_node);
	511	if (phb->is_dynamic)
	512	kfree(phb);
	513
	514	return 0;
	515	}
	516	EXPORT_SYMBOL(pcibios_remove_root_bus);