arch/powerpc/platforms/cell/spu_manage.c - linux/kernel/git/will/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * spu management operations for of based platforms
  *
  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
  * Copyright 2006 Sony Corp.
  * (C) Copyright 2007 TOSHIBA CORPORATION
  */

 #include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/export.h>
 #include <linux/ptrace.h>
 #include <linux/wait.h>
 #include <linux/mm.h>
 #include <linux/io.h>
 #include <linux/mutex.h>
 #include <linux/device.h>

 #include <asm/spu.h>
 #include <asm/spu_priv1.h>
 #include <asm/firmware.h>
 #include <asm/prom.h>

 #include "spufs/spufs.h"
 #include "interrupt.h"

 struct device_node *spu_devnode(struct spu *spu)
 {
 	return spu->devnode;
 }

 EXPORT_SYMBOL_GPL(spu_devnode);

 static u64 __init find_spu_unit_number(struct device_node *spe)
 {
 	const unsigned int *prop;
 	int proplen;

 	/* new device trees should provide the physical-id attribute */
 	prop = of_get_property(spe, "physical-id", &proplen);
 	if (proplen == 4)
 		return (u64)*prop;

 	/* celleb device tree provides the unit-id */
 	prop = of_get_property(spe, "unit-id", &proplen);
 	if (proplen == 4)
 		return (u64)*prop;

 	/* legacy device trees provide the id in the reg attribute */
 	prop = of_get_property(spe, "reg", &proplen);
 	if (proplen == 4)
 		return (u64)*prop;

 	return 0;
 }

 static void spu_unmap(struct spu *spu)
 {
 	if (!firmware_has_feature(FW_FEATURE_LPAR))
 		iounmap(spu->priv1);
 	iounmap(spu->priv2);
 	iounmap(spu->problem);
 	iounmap((__force u8 __iomem *)spu->local_store);
 }

 static int __init spu_map_interrupts_old(struct spu *spu,
 	struct device_node *np)
 {
 	unsigned int isrc;
 	const u32 *tmp;
 	int nid;

 	/* Get the interrupt source unit from the device-tree */
 	tmp = of_get_property(np, "isrc", NULL);
 	if (!tmp)
 		return -ENODEV;
 	isrc = tmp[0];

 	tmp = of_get_property(np->parent->parent, "node-id", NULL);
 	if (!tmp) {
 		printk(KERN_WARNING "%s: can't find node-id\n", __func__);
 		nid = spu->node;
 	} else
 		nid = tmp[0];

 	/* Add the node number */
 	isrc |= nid << IIC_IRQ_NODE_SHIFT;

 	/* Now map interrupts of all 3 classes */
 	spu->irqs[0] = irq_create_mapping(NULL, IIC_IRQ_CLASS_0 | isrc);
 	spu->irqs[1] = irq_create_mapping(NULL, IIC_IRQ_CLASS_1 | isrc);
 	spu->irqs[2] = irq_create_mapping(NULL, IIC_IRQ_CLASS_2 | isrc);

 	/* Right now, we only fail if class 2 failed */
 	if (!spu->irqs[2])
 		return -EINVAL;

 	return 0;
 }

 static void __iomem * __init spu_map_prop_old(struct spu *spu,
 					      struct device_node *n,
 					      const char *name)
 {
 	const struct address_prop {
 		unsigned long address;
 		unsigned int len;
 	} __attribute__((packed)) *prop;
 	int proplen;

 	prop = of_get_property(n, name, &proplen);
 	if (prop == NULL || proplen != sizeof (struct address_prop))
 		return NULL;

 	return ioremap(prop->address, prop->len);
 }

 static int __init spu_map_device_old(struct spu *spu)
 {
 	struct device_node *node = spu->devnode;
 	const char *prop;
 	int ret;

 	ret = -ENODEV;
 	spu->name = of_get_property(node, "name", NULL);
 	if (!spu->name)
 		goto out;

 	prop = of_get_property(node, "local-store", NULL);
 	if (!prop)
 		goto out;
 	spu->local_store_phys = *(unsigned long *)prop;

 	/* we use local store as ram, not io memory */
 	spu->local_store = (void __force *)
 		spu_map_prop_old(spu, node, "local-store");
 	if (!spu->local_store)
 		goto out;

 	prop = of_get_property(node, "problem", NULL);
 	if (!prop)
 		goto out_unmap;
 	spu->problem_phys = *(unsigned long *)prop;

 	spu->problem = spu_map_prop_old(spu, node, "problem");
 	if (!spu->problem)
 		goto out_unmap;

 	spu->priv2 = spu_map_prop_old(spu, node, "priv2");
 	if (!spu->priv2)
 		goto out_unmap;

 	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
 		spu->priv1 = spu_map_prop_old(spu, node, "priv1");
 		if (!spu->priv1)
 			goto out_unmap;
 	}

 	ret = 0;
 	goto out;

 out_unmap:
 	spu_unmap(spu);
 out:
 	return ret;
 }

 static int __init spu_map_interrupts(struct spu *spu, struct device_node *np)
 {
 	int i;

 	for (i=0; i < 3; i++) {
 		spu->irqs[i] = irq_of_parse_and_map(np, i);
 		if (!spu->irqs[i])
 			goto err;
 	}
 	return 0;

 err:
 	pr_debug("failed to map irq %x for spu %s\n", i, spu->name);
 	for (; i >= 0; i--) {
 		if (spu->irqs[i])
 			irq_dispose_mapping(spu->irqs[i]);
 	}
 	return -EINVAL;
 }

 static int spu_map_resource(struct spu *spu, int nr,
 			    void __iomem** virt, unsigned long *phys)
 {
 	struct device_node *np = spu->devnode;
 	struct resource resource = { };
 	unsigned long len;
 	int ret;

 	ret = of_address_to_resource(np, nr, &resource);
 	if (ret)
 		return ret;
 	if (phys)
 		*phys = resource.start;
 	len = resource_size(&resource);
 	*virt = ioremap(resource.start, len);
 	if (!*virt)
 		return -EINVAL;
 	return 0;
 }

 static int __init spu_map_device(struct spu *spu)
 {
 	struct device_node *np = spu->devnode;
 	int ret = -ENODEV;

 	spu->name = of_get_property(np, "name", NULL);
 	if (!spu->name)
 		goto out;

 	ret = spu_map_resource(spu, 0, (void __iomem**)&spu->local_store,
 			       &spu->local_store_phys);
 	if (ret) {
 		pr_debug("spu_new: failed to map %pOF resource 0\n",
 			 np);
 		goto out;
 	}
 	ret = spu_map_resource(spu, 1, (void __iomem**)&spu->problem,
 			       &spu->problem_phys);
 	if (ret) {
 		pr_debug("spu_new: failed to map %pOF resource 1\n",
 			 np);
 		goto out_unmap;
 	}
 	ret = spu_map_resource(spu, 2, (void __iomem**)&spu->priv2, NULL);
 	if (ret) {
 		pr_debug("spu_new: failed to map %pOF resource 2\n",
 			 np);
 		goto out_unmap;
 	}
 	if (!firmware_has_feature(FW_FEATURE_LPAR))
 		ret = spu_map_resource(spu, 3,
 			       (void __iomem**)&spu->priv1, NULL);
 	if (ret) {
 		pr_debug("spu_new: failed to map %pOF resource 3\n",
 			 np);
 		goto out_unmap;
 	}
 	pr_debug("spu_new: %pOF maps:\n", np);
 	pr_debug("  local store   : 0x%016lx -> 0x%p\n",
 		 spu->local_store_phys, spu->local_store);
 	pr_debug("  problem state : 0x%016lx -> 0x%p\n",
 		 spu->problem_phys, spu->problem);
 	pr_debug("  priv2         :                       0x%p\n", spu->priv2);
 	pr_debug("  priv1         :                       0x%p\n", spu->priv1);

 	return 0;

 out_unmap:
 	spu_unmap(spu);
 out:
 	pr_debug("failed to map spe %s: %d\n", spu->name, ret);
 	return ret;
 }

 static int __init of_enumerate_spus(int (*fn)(void *data))
 {
 	int ret;
 	struct device_node *node;
 	unsigned int n = 0;

 	ret = -ENODEV;
 	for_each_node_by_type(node, "spe") {
 		ret = fn(node);
 		if (ret) {
 			printk(KERN_WARNING "%s: Error initializing %pOFn\n",
 				__func__, node);
 			of_node_put(node);
 			break;
 		}
 		n++;
 	}
 	return ret ? ret : n;
 }

 static int __init of_create_spu(struct spu *spu, void *data)
 {
 	int ret;
 	struct device_node *spe = (struct device_node *)data;
 	static int legacy_map = 0, legacy_irq = 0;

 	spu->devnode = of_node_get(spe);
 	spu->spe_id = find_spu_unit_number(spe);

 	spu->node = of_node_to_nid(spe);
 	if (spu->node >= MAX_NUMNODES) {
 		printk(KERN_WARNING "SPE %pOF on node %d ignored,"
 		       " node number too big\n", spe, spu->node);
 		printk(KERN_WARNING "Check if CONFIG_NUMA is enabled.\n");
 		ret = -ENODEV;
 		goto out;
 	}

 	ret = spu_map_device(spu);
 	if (ret) {
 		if (!legacy_map) {
 			legacy_map = 1;
 			printk(KERN_WARNING "%s: Legacy device tree found, "
 				"trying to map old style\n", __func__);
 		}
 		ret = spu_map_device_old(spu);
 		if (ret) {
 			printk(KERN_ERR "Unable to map %s\n",
 				spu->name);
 			goto out;
 		}
 	}

 	ret = spu_map_interrupts(spu, spe);
 	if (ret) {
 		if (!legacy_irq) {
 			legacy_irq = 1;
 			printk(KERN_WARNING "%s: Legacy device tree found, "
 				"trying old style irq\n", __func__);
 		}
 		ret = spu_map_interrupts_old(spu, spe);
 		if (ret) {
 			printk(KERN_ERR "%s: could not map interrupts\n",
 				spu->name);
 			goto out_unmap;
 		}
 	}

 	pr_debug("Using SPE %s %p %p %p %p %d\n", spu->name,
 		spu->local_store, spu->problem, spu->priv1,
 		spu->priv2, spu->number);
 	goto out;

 out_unmap:
 	spu_unmap(spu);
 out:
 	return ret;
 }

 static int of_destroy_spu(struct spu *spu)
 {
 	spu_unmap(spu);
 	of_node_put(spu->devnode);
 	return 0;
 }

 static void enable_spu_by_master_run(struct spu_context *ctx)
 {
 	ctx->ops->master_start(ctx);
 }

 static void disable_spu_by_master_run(struct spu_context *ctx)
 {
 	ctx->ops->master_stop(ctx);
 }

 /* Hardcoded affinity idxs for qs20 */
 #define QS20_SPES_PER_BE 8
 static int qs20_reg_idxs[QS20_SPES_PER_BE] =   { 0, 2, 4, 6, 7, 5, 3, 1 };
 static int qs20_reg_memory[QS20_SPES_PER_BE] = { 1, 1, 0, 0, 0, 0, 0, 0 };

 static struct spu *spu_lookup_reg(int node, u32 reg)
 {
 	struct spu *spu;
 	const u32 *spu_reg;

 	list_for_each_entry(spu, &cbe_spu_info[node].spus, cbe_list) {
 		spu_reg = of_get_property(spu_devnode(spu), "reg", NULL);
 		if (*spu_reg == reg)
 			return spu;
 	}
 	return NULL;
 }

 static void init_affinity_qs20_harcoded(void)
 {
 	int node, i;
 	struct spu *last_spu, *spu;
 	u32 reg;

 	for (node = 0; node < MAX_NUMNODES; node++) {
 		last_spu = NULL;
 		for (i = 0; i < QS20_SPES_PER_BE; i++) {
 			reg = qs20_reg_idxs[i];
 			spu = spu_lookup_reg(node, reg);
 			if (!spu)
 				continue;
 			spu->has_mem_affinity = qs20_reg_memory[reg];
 			if (last_spu)
 				list_add_tail(&spu->aff_list,
 						&last_spu->aff_list);
 			last_spu = spu;
 		}
 	}
 }

 static int of_has_vicinity(void)
 {
 	struct device_node *dn;

 	for_each_node_by_type(dn, "spe") {
 		if (of_find_property(dn, "vicinity", NULL))  {
 			of_node_put(dn);
 			return 1;
 		}
 	}
 	return 0;
 }

 static struct spu *devnode_spu(int cbe, struct device_node *dn)
 {
 	struct spu *spu;

 	list_for_each_entry(spu, &cbe_spu_info[cbe].spus, cbe_list)
 		if (spu_devnode(spu) == dn)
 			return spu;
 	return NULL;
 }

 static struct spu *
 neighbour_spu(int cbe, struct device_node *target, struct device_node *avoid)
 {
 	struct spu *spu;
 	struct device_node *spu_dn;
 	const phandle *vic_handles;
 	int lenp, i;

 	list_for_each_entry(spu, &cbe_spu_info[cbe].spus, cbe_list) {
 		spu_dn = spu_devnode(spu);
 		if (spu_dn == avoid)
 			continue;
 		vic_handles = of_get_property(spu_dn, "vicinity", &lenp);
 		for (i=0; i < (lenp / sizeof(phandle)); i++) {
 			if (vic_handles[i] == target->phandle)
 				return spu;
 		}
 	}
 	return NULL;
 }

 static void init_affinity_node(int cbe)
 {
 	struct spu *spu, *last_spu;
 	struct device_node *vic_dn, *last_spu_dn;
 	phandle avoid_ph;
 	const phandle *vic_handles;
 	int lenp, i, added;

 	last_spu = list_first_entry(&cbe_spu_info[cbe].spus, struct spu,
 								cbe_list);
 	avoid_ph = 0;
 	for (added = 1; added < cbe_spu_info[cbe].n_spus; added++) {
 		last_spu_dn = spu_devnode(last_spu);
 		vic_handles = of_get_property(last_spu_dn, "vicinity", &lenp);

 		/*
 		 * Walk through each phandle in vicinity property of the spu
 		 * (tipically two vicinity phandles per spe node)
 		 */
 		for (i = 0; i < (lenp / sizeof(phandle)); i++) {
 			if (vic_handles[i] == avoid_ph)
 				continue;

 			vic_dn = of_find_node_by_phandle(vic_handles[i]);
 			if (!vic_dn)
 				continue;

 			if (of_node_name_eq(vic_dn, "spe") ) {
 				spu = devnode_spu(cbe, vic_dn);
 				avoid_ph = last_spu_dn->phandle;
 			} else {
 				/*
 				 * "mic-tm" and "bif0" nodes do not have
 				 * vicinity property. So we need to find the
 				 * spe which has vic_dn as neighbour, but
 				 * skipping the one we came from (last_spu_dn)
 				 */
 				spu = neighbour_spu(cbe, vic_dn, last_spu_dn);
 				if (!spu)
 					continue;
 				if (of_node_name_eq(vic_dn, "mic-tm")) {
 					last_spu->has_mem_affinity = 1;
 					spu->has_mem_affinity = 1;
 				}
 				avoid_ph = vic_dn->phandle;
 			}

 			list_add_tail(&spu->aff_list, &last_spu->aff_list);
 			last_spu = spu;
 			break;
 		}
 	}
 }

 static void init_affinity_fw(void)
 {
 	int cbe;

 	for (cbe = 0; cbe < MAX_NUMNODES; cbe++)
 		init_affinity_node(cbe);
 }

 static int __init init_affinity(void)
 {
 	if (of_has_vicinity()) {
 		init_affinity_fw();
 	} else {
 		if (of_machine_is_compatible("IBM,CPBW-1.0"))
 			init_affinity_qs20_harcoded();
 		else
 			printk("No affinity configuration found\n");
 	}

 	return 0;
 }

 const struct spu_management_ops spu_management_of_ops = {
 	.enumerate_spus = of_enumerate_spus,
 	.create_spu = of_create_spu,
 	.destroy_spu = of_destroy_spu,
 	.enable_spu = enable_spu_by_master_run,
 	.disable_spu = disable_spu_by_master_run,
 	.init_affinity = init_affinity,
 };
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* spu management operations for of based platforms
	*
	* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
	* Copyright 2006 Sony Corp.
	* (C) Copyright 2007 TOSHIBA CORPORATION
	*/

	#include <linux/interrupt.h>
	#include <linux/list.h>
	#include <linux/export.h>
	#include <linux/ptrace.h>
	#include <linux/wait.h>
	#include <linux/mm.h>
	#include <linux/io.h>
	#include <linux/mutex.h>
	#include <linux/device.h>

	#include <asm/spu.h>
	#include <asm/spu_priv1.h>
	#include <asm/firmware.h>
	#include <asm/prom.h>

	#include "spufs/spufs.h"
	#include "interrupt.h"

	struct device_node spu_devnode(struct spu spu)
	{
	return spu->devnode;
	}

	EXPORT_SYMBOL_GPL(spu_devnode);

	static u64 __init find_spu_unit_number(struct device_node *spe)
	{
	const unsigned int *prop;
	int proplen;

	/* new device trees should provide the physical-id attribute */
	prop = of_get_property(spe, "physical-id", &proplen);
	if (proplen == 4)
	return (u64)*prop;

	/* celleb device tree provides the unit-id */
	prop = of_get_property(spe, "unit-id", &proplen);
	if (proplen == 4)
	return (u64)*prop;

	/* legacy device trees provide the id in the reg attribute */
	prop = of_get_property(spe, "reg", &proplen);
	if (proplen == 4)
	return (u64)*prop;

	return 0;
	}

	static void spu_unmap(struct spu *spu)
	{
	if (!firmware_has_feature(FW_FEATURE_LPAR))
	iounmap(spu->priv1);
	iounmap(spu->priv2);
	iounmap(spu->problem);
	iounmap((__force u8 __iomem *)spu->local_store);
	}

	static int __init spu_map_interrupts_old(struct spu *spu,
	struct device_node *np)
	{
	unsigned int isrc;
	const u32 *tmp;
	int nid;

	/* Get the interrupt source unit from the device-tree */
	tmp = of_get_property(np, "isrc", NULL);
	if (!tmp)
	return -ENODEV;
	isrc = tmp[0];

	tmp = of_get_property(np->parent->parent, "node-id", NULL);
	if (!tmp) {
	printk(KERN_WARNING "%s: can't find node-id\n", __func__);
	nid = spu->node;
	} else
	nid = tmp[0];

	/* Add the node number */
	isrc \|= nid << IIC_IRQ_NODE_SHIFT;

	/* Now map interrupts of all 3 classes */
	spu->irqs[0] = irq_create_mapping(NULL, IIC_IRQ_CLASS_0 \| isrc);
	spu->irqs[1] = irq_create_mapping(NULL, IIC_IRQ_CLASS_1 \| isrc);
	spu->irqs[2] = irq_create_mapping(NULL, IIC_IRQ_CLASS_2 \| isrc);

	/* Right now, we only fail if class 2 failed */
	if (!spu->irqs[2])
	return -EINVAL;

	return 0;
	}

	static void __iomem * __init spu_map_prop_old(struct spu *spu,
	struct device_node *n,
	const char *name)
	{
	const struct address_prop {
	unsigned long address;
	unsigned int len;
	} __attribute__((packed)) *prop;
	int proplen;

	prop = of_get_property(n, name, &proplen);
	if (prop == NULL \|\| proplen != sizeof (struct address_prop))
	return NULL;

	return ioremap(prop->address, prop->len);
	}

	static int __init spu_map_device_old(struct spu *spu)
	{
	struct device_node *node = spu->devnode;
	const char *prop;
	int ret;

	ret = -ENODEV;
	spu->name = of_get_property(node, "name", NULL);
	if (!spu->name)
	goto out;

	prop = of_get_property(node, "local-store", NULL);
	if (!prop)
	goto out;
	spu->local_store_phys = (unsigned long )prop;

	/* we use local store as ram, not io memory */
	spu->local_store = (void __force *)
	spu_map_prop_old(spu, node, "local-store");
	if (!spu->local_store)
	goto out;

	prop = of_get_property(node, "problem", NULL);
	if (!prop)
	goto out_unmap;
	spu->problem_phys = (unsigned long )prop;

	spu->problem = spu_map_prop_old(spu, node, "problem");
	if (!spu->problem)
	goto out_unmap;

	spu->priv2 = spu_map_prop_old(spu, node, "priv2");
	if (!spu->priv2)
	goto out_unmap;

	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
	spu->priv1 = spu_map_prop_old(spu, node, "priv1");
	if (!spu->priv1)
	goto out_unmap;
	}

	ret = 0;
	goto out;

	out_unmap:
	spu_unmap(spu);
	out:
	return ret;
	}

	static int __init spu_map_interrupts(struct spu spu, struct device_node np)
	{
	int i;

	for (i=0; i < 3; i++) {
	spu->irqs[i] = irq_of_parse_and_map(np, i);
	if (!spu->irqs[i])
	goto err;
	}
	return 0;

	err:
	pr_debug("failed to map irq %x for spu %s\n", i, spu->name);
	for (; i >= 0; i--) {
	if (spu->irqs[i])
	irq_dispose_mapping(spu->irqs[i]);
	}
	return -EINVAL;
	}

	static int spu_map_resource(struct spu *spu, int nr,
	void __iomem** virt, unsigned long *phys)
	{
	struct device_node *np = spu->devnode;
	struct resource resource = { };
	unsigned long len;
	int ret;

	ret = of_address_to_resource(np, nr, &resource);
	if (ret)
	return ret;
	if (phys)
	*phys = resource.start;
	len = resource_size(&resource);
	*virt = ioremap(resource.start, len);
	if (!*virt)
	return -EINVAL;
	return 0;
	}

	static int __init spu_map_device(struct spu *spu)
	{
	struct device_node *np = spu->devnode;
	int ret = -ENODEV;

	spu->name = of_get_property(np, "name", NULL);
	if (!spu->name)
	goto out;

	ret = spu_map_resource(spu, 0, (void __iomem**)&spu->local_store,
	&spu->local_store_phys);
	if (ret) {
	pr_debug("spu_new: failed to map %pOF resource 0\n",
	np);
	goto out;
	}
	ret = spu_map_resource(spu, 1, (void __iomem**)&spu->problem,
	&spu->problem_phys);
	if (ret) {
	pr_debug("spu_new: failed to map %pOF resource 1\n",
	np);
	goto out_unmap;
	}
	ret = spu_map_resource(spu, 2, (void __iomem**)&spu->priv2, NULL);
	if (ret) {
	pr_debug("spu_new: failed to map %pOF resource 2\n",
	np);
	goto out_unmap;
	}
	if (!firmware_has_feature(FW_FEATURE_LPAR))
	ret = spu_map_resource(spu, 3,
	(void __iomem**)&spu->priv1, NULL);
	if (ret) {
	pr_debug("spu_new: failed to map %pOF resource 3\n",
	np);
	goto out_unmap;
	}
	pr_debug("spu_new: %pOF maps:\n", np);
	pr_debug(" local store : 0x%016lx -> 0x%p\n",
	spu->local_store_phys, spu->local_store);
	pr_debug(" problem state : 0x%016lx -> 0x%p\n",
	spu->problem_phys, spu->problem);
	pr_debug(" priv2 : 0x%p\n", spu->priv2);
	pr_debug(" priv1 : 0x%p\n", spu->priv1);

	return 0;

	out_unmap:
	spu_unmap(spu);
	out:
	pr_debug("failed to map spe %s: %d\n", spu->name, ret);
	return ret;
	}

	static int __init of_enumerate_spus(int (fn)(void data))
	{
	int ret;
	struct device_node *node;
	unsigned int n = 0;

	ret = -ENODEV;
	for_each_node_by_type(node, "spe") {
	ret = fn(node);
	if (ret) {
	printk(KERN_WARNING "%s: Error initializing %pOFn\n",
	__func__, node);
	of_node_put(node);
	break;
	}
	n++;
	}
	return ret ? ret : n;
	}

	static int __init of_create_spu(struct spu spu, void data)
	{
	int ret;
	struct device_node spe = (struct device_node )data;
	static int legacy_map = 0, legacy_irq = 0;

	spu->devnode = of_node_get(spe);
	spu->spe_id = find_spu_unit_number(spe);

	spu->node = of_node_to_nid(spe);
	if (spu->node >= MAX_NUMNODES) {
	printk(KERN_WARNING "SPE %pOF on node %d ignored,"
	" node number too big\n", spe, spu->node);
	printk(KERN_WARNING "Check if CONFIG_NUMA is enabled.\n");
	ret = -ENODEV;
	goto out;
	}

	ret = spu_map_device(spu);
	if (ret) {
	if (!legacy_map) {
	legacy_map = 1;
	printk(KERN_WARNING "%s: Legacy device tree found, "
	"trying to map old style\n", __func__);
	}
	ret = spu_map_device_old(spu);
	if (ret) {
	printk(KERN_ERR "Unable to map %s\n",
	spu->name);
	goto out;
	}
	}

	ret = spu_map_interrupts(spu, spe);
	if (ret) {
	if (!legacy_irq) {
	legacy_irq = 1;
	printk(KERN_WARNING "%s: Legacy device tree found, "
	"trying old style irq\n", __func__);
	}
	ret = spu_map_interrupts_old(spu, spe);
	if (ret) {
	printk(KERN_ERR "%s: could not map interrupts\n",
	spu->name);
	goto out_unmap;
	}
	}

	pr_debug("Using SPE %s %p %p %p %p %d\n", spu->name,
	spu->local_store, spu->problem, spu->priv1,
	spu->priv2, spu->number);
	goto out;

	out_unmap:
	spu_unmap(spu);
	out:
	return ret;
	}

	static int of_destroy_spu(struct spu *spu)
	{
	spu_unmap(spu);
	of_node_put(spu->devnode);
	return 0;
	}

	static void enable_spu_by_master_run(struct spu_context *ctx)
	{
	ctx->ops->master_start(ctx);
	}

	static void disable_spu_by_master_run(struct spu_context *ctx)
	{
	ctx->ops->master_stop(ctx);
	}

	/* Hardcoded affinity idxs for qs20 */
	#define QS20_SPES_PER_BE 8
	static int qs20_reg_idxs[QS20_SPES_PER_BE] = { 0, 2, 4, 6, 7, 5, 3, 1 };
	static int qs20_reg_memory[QS20_SPES_PER_BE] = { 1, 1, 0, 0, 0, 0, 0, 0 };

	static struct spu *spu_lookup_reg(int node, u32 reg)
	{
	struct spu *spu;
	const u32 *spu_reg;

	list_for_each_entry(spu, &cbe_spu_info[node].spus, cbe_list) {
	spu_reg = of_get_property(spu_devnode(spu), "reg", NULL);
	if (*spu_reg == reg)
	return spu;
	}
	return NULL;
	}

	static void init_affinity_qs20_harcoded(void)
	{
	int node, i;
	struct spu last_spu, spu;
	u32 reg;

	for (node = 0; node < MAX_NUMNODES; node++) {
	last_spu = NULL;
	for (i = 0; i < QS20_SPES_PER_BE; i++) {
	reg = qs20_reg_idxs[i];
	spu = spu_lookup_reg(node, reg);
	if (!spu)
	continue;
	spu->has_mem_affinity = qs20_reg_memory[reg];
	if (last_spu)
	list_add_tail(&spu->aff_list,
	&last_spu->aff_list);
	last_spu = spu;
	}
	}
	}

	static int of_has_vicinity(void)
	{
	struct device_node *dn;

	for_each_node_by_type(dn, "spe") {
	if (of_find_property(dn, "vicinity", NULL)) {
	of_node_put(dn);
	return 1;
	}
	}
	return 0;
	}

	static struct spu devnode_spu(int cbe, struct device_node dn)
	{
	struct spu *spu;

	list_for_each_entry(spu, &cbe_spu_info[cbe].spus, cbe_list)
	if (spu_devnode(spu) == dn)
	return spu;
	return NULL;
	}

	static struct spu *
	neighbour_spu(int cbe, struct device_node target, struct device_node avoid)
	{
	struct spu *spu;
	struct device_node *spu_dn;
	const phandle *vic_handles;
	int lenp, i;

	list_for_each_entry(spu, &cbe_spu_info[cbe].spus, cbe_list) {
	spu_dn = spu_devnode(spu);
	if (spu_dn == avoid)
	continue;
	vic_handles = of_get_property(spu_dn, "vicinity", &lenp);
	for (i=0; i < (lenp / sizeof(phandle)); i++) {
	if (vic_handles[i] == target->phandle)
	return spu;
	}
	}
	return NULL;
	}

	static void init_affinity_node(int cbe)
	{
	struct spu spu, last_spu;
	struct device_node vic_dn, last_spu_dn;
	phandle avoid_ph;
	const phandle *vic_handles;
	int lenp, i, added;

	last_spu = list_first_entry(&cbe_spu_info[cbe].spus, struct spu,
	cbe_list);
	avoid_ph = 0;
	for (added = 1; added < cbe_spu_info[cbe].n_spus; added++) {
	last_spu_dn = spu_devnode(last_spu);
	vic_handles = of_get_property(last_spu_dn, "vicinity", &lenp);

	/*
	* Walk through each phandle in vicinity property of the spu
	* (tipically two vicinity phandles per spe node)
	*/
	for (i = 0; i < (lenp / sizeof(phandle)); i++) {
	if (vic_handles[i] == avoid_ph)
	continue;

	vic_dn = of_find_node_by_phandle(vic_handles[i]);
	if (!vic_dn)
	continue;

	if (of_node_name_eq(vic_dn, "spe") ) {
	spu = devnode_spu(cbe, vic_dn);
	avoid_ph = last_spu_dn->phandle;
	} else {
	/*
	* "mic-tm" and "bif0" nodes do not have
	* vicinity property. So we need to find the
	* spe which has vic_dn as neighbour, but
	* skipping the one we came from (last_spu_dn)
	*/
	spu = neighbour_spu(cbe, vic_dn, last_spu_dn);
	if (!spu)
	continue;
	if (of_node_name_eq(vic_dn, "mic-tm")) {
	last_spu->has_mem_affinity = 1;
	spu->has_mem_affinity = 1;
	}
	avoid_ph = vic_dn->phandle;
	}

	list_add_tail(&spu->aff_list, &last_spu->aff_list);
	last_spu = spu;
	break;
	}
	}
	}

	static void init_affinity_fw(void)
	{
	int cbe;

	for (cbe = 0; cbe < MAX_NUMNODES; cbe++)
	init_affinity_node(cbe);
	}

	static int __init init_affinity(void)
	{
	if (of_has_vicinity()) {
	init_affinity_fw();
	} else {
	if (of_machine_is_compatible("IBM,CPBW-1.0"))
	init_affinity_qs20_harcoded();
	else
	printk("No affinity configuration found\n");
	}

	return 0;
	}

	const struct spu_management_ops spu_management_of_ops = {
	.enumerate_spus = of_enumerate_spus,
	.create_spu = of_create_spu,
	.destroy_spu = of_destroy_spu,
	.enable_spu = enable_spu_by_master_run,
	.disable_spu = disable_spu_by_master_run,
	.init_affinity = init_affinity,
	};