drivers/soc/fsl/qbman/qman_portal.c - linux - Git at Google

 /* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *     * Redistributions of source code must retain the above copyright
  *	 notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above copyright
  *	 notice, this list of conditions and the following disclaimer in the
  *	 documentation and/or other materials provided with the distribution.
  *     * Neither the name of Freescale Semiconductor nor the
  *	 names of its contributors may be used to endorse or promote products
  *	 derived from this software without specific prior written permission.
  *
  * ALTERNATIVELY, this software may be distributed under the terms of the
  * GNU General Public License ("GPL") as published by the Free Software
  * Foundation, either version 2 of that License or (at your option) any
  * later version.
  *
  * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "qman_priv.h"

 struct qman_portal *qman_dma_portal;
 EXPORT_SYMBOL(qman_dma_portal);

 /* Enable portal interupts (as opposed to polling mode) */
 #define CONFIG_FSL_DPA_PIRQ_SLOW  1
 #define CONFIG_FSL_DPA_PIRQ_FAST  1

 static struct cpumask portal_cpus;
 /* protect qman global registers and global data shared among portals */
 static DEFINE_SPINLOCK(qman_lock);

 static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
 {
 #ifdef CONFIG_FSL_PAMU
 	struct device *dev = pcfg->dev;
 	int window_count = 1;
 	struct iommu_domain_geometry geom_attr;
 	struct pamu_stash_attribute stash_attr;
 	int ret;

 	pcfg->iommu_domain = iommu_domain_alloc(&platform_bus_type);
 	if (!pcfg->iommu_domain) {
 		dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
 		goto no_iommu;
 	}
 	geom_attr.aperture_start = 0;
 	geom_attr.aperture_end =
 		((dma_addr_t)1 << min(8 * sizeof(dma_addr_t), (size_t)36)) - 1;
 	geom_attr.force_aperture = true;
 	ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_GEOMETRY,
 				    &geom_attr);
 	if (ret < 0) {
 		dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
 			ret);
 		goto out_domain_free;
 	}
 	ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_WINDOWS,
 				    &window_count);
 	if (ret < 0) {
 		dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
 			ret);
 		goto out_domain_free;
 	}
 	stash_attr.cpu = cpu;
 	stash_attr.cache = PAMU_ATTR_CACHE_L1;
 	ret = iommu_domain_set_attr(pcfg->iommu_domain,
 				    DOMAIN_ATTR_FSL_PAMU_STASH,
 				    &stash_attr);
 	if (ret < 0) {
 		dev_err(dev, "%s(): iommu_domain_set_attr() = %d",
 			__func__, ret);
 		goto out_domain_free;
 	}
 	ret = iommu_domain_window_enable(pcfg->iommu_domain, 0, 0, 1ULL << 36,
 					 IOMMU_READ | IOMMU_WRITE);
 	if (ret < 0) {
 		dev_err(dev, "%s(): iommu_domain_window_enable() = %d",
 			__func__, ret);
 		goto out_domain_free;
 	}
 	ret = iommu_attach_device(pcfg->iommu_domain, dev);
 	if (ret < 0) {
 		dev_err(dev, "%s(): iommu_device_attach() = %d", __func__,
 			ret);
 		goto out_domain_free;
 	}
 	ret = iommu_domain_set_attr(pcfg->iommu_domain,
 				    DOMAIN_ATTR_FSL_PAMU_ENABLE,
 				    &window_count);
 	if (ret < 0) {
 		dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
 			ret);
 		goto out_detach_device;
 	}

 no_iommu:
 #endif
 	qman_set_sdest(pcfg->channel, cpu);

 	return;

 #ifdef CONFIG_FSL_PAMU
 out_detach_device:
 	iommu_detach_device(pcfg->iommu_domain, NULL);
 out_domain_free:
 	iommu_domain_free(pcfg->iommu_domain);
 	pcfg->iommu_domain = NULL;
 #endif
 }

 static struct qman_portal *init_pcfg(struct qm_portal_config *pcfg)
 {
 	struct qman_portal *p;
 	u32 irq_sources = 0;

 	/* We need the same LIODN offset for all portals */
 	qman_liodn_fixup(pcfg->channel);

 	pcfg->iommu_domain = NULL;
 	portal_set_cpu(pcfg, pcfg->cpu);

 	p = qman_create_affine_portal(pcfg, NULL);
 	if (!p) {
 		dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
 			 __func__, pcfg->cpu);
 		return NULL;
 	}

 	/* Determine what should be interrupt-vs-poll driven */
 #ifdef CONFIG_FSL_DPA_PIRQ_SLOW
 	irq_sources |= QM_PIRQ_EQCI | QM_PIRQ_EQRI | QM_PIRQ_MRI |
 		       QM_PIRQ_CSCI;
 #endif
 #ifdef CONFIG_FSL_DPA_PIRQ_FAST
 	irq_sources |= QM_PIRQ_DQRI;
 #endif
 	qman_p_irqsource_add(p, irq_sources);

 	spin_lock(&qman_lock);
 	if (cpumask_equal(&portal_cpus, cpu_possible_mask)) {
 		/* all assigned portals are initialized now */
 		qman_init_cgr_all();
 	}

 	if (!qman_dma_portal)
 		qman_dma_portal = p;

 	spin_unlock(&qman_lock);

 	dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);

 	return p;
 }

 static void qman_portal_update_sdest(const struct qm_portal_config *pcfg,
 							unsigned int cpu)
 {
 #ifdef CONFIG_FSL_PAMU /* TODO */
 	struct pamu_stash_attribute stash_attr;
 	int ret;

 	if (pcfg->iommu_domain) {
 		stash_attr.cpu = cpu;
 		stash_attr.cache = PAMU_ATTR_CACHE_L1;
 		ret = iommu_domain_set_attr(pcfg->iommu_domain,
 				DOMAIN_ATTR_FSL_PAMU_STASH, &stash_attr);
 		if (ret < 0) {
 			dev_err(pcfg->dev,
 				"Failed to update pamu stash setting\n");
 			return;
 		}
 	}
 #endif
 	qman_set_sdest(pcfg->channel, cpu);
 }

 static int qman_offline_cpu(unsigned int cpu)
 {
 	struct qman_portal *p;
 	const struct qm_portal_config *pcfg;

 	p = affine_portals[cpu];
 	if (p) {
 		pcfg = qman_get_qm_portal_config(p);
 		if (pcfg) {
 			irq_set_affinity(pcfg->irq, cpumask_of(0));
 			qman_portal_update_sdest(pcfg, 0);
 		}
 	}
 	return 0;
 }

 static int qman_online_cpu(unsigned int cpu)
 {
 	struct qman_portal *p;
 	const struct qm_portal_config *pcfg;

 	p = affine_portals[cpu];
 	if (p) {
 		pcfg = qman_get_qm_portal_config(p);
 		if (pcfg) {
 			irq_set_affinity(pcfg->irq, cpumask_of(cpu));
 			qman_portal_update_sdest(pcfg, cpu);
 		}
 	}
 	return 0;
 }

 static int qman_portal_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *node = dev->of_node;
 	struct qm_portal_config *pcfg;
 	struct resource *addr_phys[2];
 	int irq, cpu, err;
 	u32 val;

 	pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
 	if (!pcfg)
 		return -ENOMEM;

 	pcfg->dev = dev;

 	addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
 					     DPAA_PORTAL_CE);
 	if (!addr_phys[0]) {
 		dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
 		return -ENXIO;
 	}

 	addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
 					     DPAA_PORTAL_CI);
 	if (!addr_phys[1]) {
 		dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
 		return -ENXIO;
 	}

 	err = of_property_read_u32(node, "cell-index", &val);
 	if (err) {
 		dev_err(dev, "Can't get %pOF property 'cell-index'\n", node);
 		return err;
 	}
 	pcfg->channel = val;
 	pcfg->cpu = -1;
 	irq = platform_get_irq(pdev, 0);
 	if (irq <= 0) {
 		dev_err(dev, "Can't get %pOF IRQ\n", node);
 		return -ENXIO;
 	}
 	pcfg->irq = irq;

 	pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
 					resource_size(addr_phys[0]),
 					QBMAN_MEMREMAP_ATTR);
 	if (!pcfg->addr_virt_ce) {
 		dev_err(dev, "memremap::CE failed\n");
 		goto err_ioremap1;
 	}

 	pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
 				resource_size(addr_phys[1]));
 	if (!pcfg->addr_virt_ci) {
 		dev_err(dev, "ioremap::CI failed\n");
 		goto err_ioremap2;
 	}

 	pcfg->pools = qm_get_pools_sdqcr();

 	spin_lock(&qman_lock);
 	cpu = cpumask_next_zero(-1, &portal_cpus);
 	if (cpu >= nr_cpu_ids) {
 		/* unassigned portal, skip init */
 		spin_unlock(&qman_lock);
 		return 0;
 	}

 	cpumask_set_cpu(cpu, &portal_cpus);
 	spin_unlock(&qman_lock);
 	pcfg->cpu = cpu;

 	if (dma_set_mask(dev, DMA_BIT_MASK(40))) {
 		dev_err(dev, "dma_set_mask() failed\n");
 		goto err_portal_init;
 	}

 	if (!init_pcfg(pcfg)) {
 		dev_err(dev, "portal init failed\n");
 		goto err_portal_init;
 	}

 	/* clear irq affinity if assigned cpu is offline */
 	if (!cpu_online(cpu))
 		qman_offline_cpu(cpu);

 	return 0;

 err_portal_init:
 	iounmap(pcfg->addr_virt_ci);
 err_ioremap2:
 	memunmap(pcfg->addr_virt_ce);
 err_ioremap1:
 	return -ENXIO;
 }

 static const struct of_device_id qman_portal_ids[] = {
 	{
 		.compatible = "fsl,qman-portal",
 	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, qman_portal_ids);

 static struct platform_driver qman_portal_driver = {
 	.driver = {
 		.name = KBUILD_MODNAME,
 		.of_match_table = qman_portal_ids,
 	},
 	.probe = qman_portal_probe,
 };

 static int __init qman_portal_driver_register(struct platform_driver *drv)
 {
 	int ret;

 	ret = platform_driver_register(drv);
 	if (ret < 0)
 		return ret;

 	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
 					"soc/qman_portal:online",
 					qman_online_cpu, qman_offline_cpu);
 	if (ret < 0) {
 		pr_err("qman: failed to register hotplug callbacks.\n");
 		platform_driver_unregister(drv);
 		return ret;
 	}
 	return 0;
 }

 module_driver(qman_portal_driver,
 	      qman_portal_driver_register, platform_driver_unregister);
	/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* * Neither the name of Freescale Semiconductor nor the
	* names of its contributors may be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* ALTERNATIVELY, this software may be distributed under the terms of the
	* GNU General Public License ("GPL") as published by the Free Software
	* Foundation, either version 2 of that License or (at your option) any
	* later version.
	*
	* THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "qman_priv.h"

	struct qman_portal *qman_dma_portal;
	EXPORT_SYMBOL(qman_dma_portal);

	/* Enable portal interupts (as opposed to polling mode) */
	#define CONFIG_FSL_DPA_PIRQ_SLOW 1
	#define CONFIG_FSL_DPA_PIRQ_FAST 1

	static struct cpumask portal_cpus;
	/* protect qman global registers and global data shared among portals */
	static DEFINE_SPINLOCK(qman_lock);

	static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
	{
	#ifdef CONFIG_FSL_PAMU
	struct device *dev = pcfg->dev;
	int window_count = 1;
	struct iommu_domain_geometry geom_attr;
	struct pamu_stash_attribute stash_attr;
	int ret;

	pcfg->iommu_domain = iommu_domain_alloc(&platform_bus_type);
	if (!pcfg->iommu_domain) {
	dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
	goto no_iommu;
	}
	geom_attr.aperture_start = 0;
	geom_attr.aperture_end =
	((dma_addr_t)1 << min(8 * sizeof(dma_addr_t), (size_t)36)) - 1;
	geom_attr.force_aperture = true;
	ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_GEOMETRY,
	&geom_attr);
	if (ret < 0) {
	dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
	ret);
	goto out_domain_free;
	}
	ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_WINDOWS,
	&window_count);
	if (ret < 0) {
	dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
	ret);
	goto out_domain_free;
	}
	stash_attr.cpu = cpu;
	stash_attr.cache = PAMU_ATTR_CACHE_L1;
	ret = iommu_domain_set_attr(pcfg->iommu_domain,
	DOMAIN_ATTR_FSL_PAMU_STASH,
	&stash_attr);
	if (ret < 0) {
	dev_err(dev, "%s(): iommu_domain_set_attr() = %d",
	__func__, ret);
	goto out_domain_free;
	}
	ret = iommu_domain_window_enable(pcfg->iommu_domain, 0, 0, 1ULL << 36,
	IOMMU_READ \| IOMMU_WRITE);
	if (ret < 0) {
	dev_err(dev, "%s(): iommu_domain_window_enable() = %d",
	__func__, ret);
	goto out_domain_free;
	}
	ret = iommu_attach_device(pcfg->iommu_domain, dev);
	if (ret < 0) {
	dev_err(dev, "%s(): iommu_device_attach() = %d", __func__,
	ret);
	goto out_domain_free;
	}
	ret = iommu_domain_set_attr(pcfg->iommu_domain,
	DOMAIN_ATTR_FSL_PAMU_ENABLE,
	&window_count);
	if (ret < 0) {
	dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
	ret);
	goto out_detach_device;
	}

	no_iommu:
	#endif
	qman_set_sdest(pcfg->channel, cpu);

	return;

	#ifdef CONFIG_FSL_PAMU
	out_detach_device:
	iommu_detach_device(pcfg->iommu_domain, NULL);
	out_domain_free:
	iommu_domain_free(pcfg->iommu_domain);
	pcfg->iommu_domain = NULL;
	#endif
	}

	static struct qman_portal init_pcfg(struct qm_portal_config pcfg)
	{
	struct qman_portal *p;
	u32 irq_sources = 0;

	/* We need the same LIODN offset for all portals */
	qman_liodn_fixup(pcfg->channel);

	pcfg->iommu_domain = NULL;
	portal_set_cpu(pcfg, pcfg->cpu);

	p = qman_create_affine_portal(pcfg, NULL);
	if (!p) {
	dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
	__func__, pcfg->cpu);
	return NULL;
	}

	/* Determine what should be interrupt-vs-poll driven */
	#ifdef CONFIG_FSL_DPA_PIRQ_SLOW
	irq_sources \|= QM_PIRQ_EQCI \| QM_PIRQ_EQRI \| QM_PIRQ_MRI \|
	QM_PIRQ_CSCI;
	#endif
	#ifdef CONFIG_FSL_DPA_PIRQ_FAST
	irq_sources \|= QM_PIRQ_DQRI;
	#endif
	qman_p_irqsource_add(p, irq_sources);

	spin_lock(&qman_lock);
	if (cpumask_equal(&portal_cpus, cpu_possible_mask)) {
	/* all assigned portals are initialized now */
	qman_init_cgr_all();
	}

	if (!qman_dma_portal)
	qman_dma_portal = p;

	spin_unlock(&qman_lock);

	dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);

	return p;
	}

	static void qman_portal_update_sdest(const struct qm_portal_config *pcfg,
	unsigned int cpu)
	{
	#ifdef CONFIG_FSL_PAMU /* TODO */
	struct pamu_stash_attribute stash_attr;
	int ret;

	if (pcfg->iommu_domain) {
	stash_attr.cpu = cpu;
	stash_attr.cache = PAMU_ATTR_CACHE_L1;
	ret = iommu_domain_set_attr(pcfg->iommu_domain,
	DOMAIN_ATTR_FSL_PAMU_STASH, &stash_attr);
	if (ret < 0) {
	dev_err(pcfg->dev,
	"Failed to update pamu stash setting\n");
	return;
	}
	}
	#endif
	qman_set_sdest(pcfg->channel, cpu);
	}

	static int qman_offline_cpu(unsigned int cpu)
	{
	struct qman_portal *p;
	const struct qm_portal_config *pcfg;

	p = affine_portals[cpu];
	if (p) {
	pcfg = qman_get_qm_portal_config(p);
	if (pcfg) {
	irq_set_affinity(pcfg->irq, cpumask_of(0));
	qman_portal_update_sdest(pcfg, 0);
	}
	}
	return 0;
	}

	static int qman_online_cpu(unsigned int cpu)
	{
	struct qman_portal *p;
	const struct qm_portal_config *pcfg;

	p = affine_portals[cpu];
	if (p) {
	pcfg = qman_get_qm_portal_config(p);
	if (pcfg) {
	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
	qman_portal_update_sdest(pcfg, cpu);
	}
	}
	return 0;
	}

	static int qman_portal_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;
	struct qm_portal_config *pcfg;
	struct resource *addr_phys[2];
	int irq, cpu, err;
	u32 val;

	pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
	if (!pcfg)
	return -ENOMEM;

	pcfg->dev = dev;

	addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
	DPAA_PORTAL_CE);
	if (!addr_phys[0]) {
	dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
	return -ENXIO;
	}

	addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
	DPAA_PORTAL_CI);
	if (!addr_phys[1]) {
	dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
	return -ENXIO;
	}

	err = of_property_read_u32(node, "cell-index", &val);
	if (err) {
	dev_err(dev, "Can't get %pOF property 'cell-index'\n", node);
	return err;
	}
	pcfg->channel = val;
	pcfg->cpu = -1;
	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
	dev_err(dev, "Can't get %pOF IRQ\n", node);
	return -ENXIO;
	}
	pcfg->irq = irq;

	pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
	resource_size(addr_phys[0]),
	QBMAN_MEMREMAP_ATTR);
	if (!pcfg->addr_virt_ce) {
	dev_err(dev, "memremap::CE failed\n");
	goto err_ioremap1;
	}

	pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
	resource_size(addr_phys[1]));
	if (!pcfg->addr_virt_ci) {
	dev_err(dev, "ioremap::CI failed\n");
	goto err_ioremap2;
	}

	pcfg->pools = qm_get_pools_sdqcr();

	spin_lock(&qman_lock);
	cpu = cpumask_next_zero(-1, &portal_cpus);
	if (cpu >= nr_cpu_ids) {
	/* unassigned portal, skip init */
	spin_unlock(&qman_lock);
	return 0;
	}

	cpumask_set_cpu(cpu, &portal_cpus);
	spin_unlock(&qman_lock);
	pcfg->cpu = cpu;

	if (dma_set_mask(dev, DMA_BIT_MASK(40))) {
	dev_err(dev, "dma_set_mask() failed\n");
	goto err_portal_init;
	}

	if (!init_pcfg(pcfg)) {
	dev_err(dev, "portal init failed\n");
	goto err_portal_init;
	}

	/* clear irq affinity if assigned cpu is offline */
	if (!cpu_online(cpu))
	qman_offline_cpu(cpu);

	return 0;

	err_portal_init:
	iounmap(pcfg->addr_virt_ci);
	err_ioremap2:
	memunmap(pcfg->addr_virt_ce);
	err_ioremap1:
	return -ENXIO;
	}

	static const struct of_device_id qman_portal_ids[] = {
	{
	.compatible = "fsl,qman-portal",
	},
	{}
	};
	MODULE_DEVICE_TABLE(of, qman_portal_ids);

	static struct platform_driver qman_portal_driver = {
	.driver = {
	.name = KBUILD_MODNAME,
	.of_match_table = qman_portal_ids,
	},
	.probe = qman_portal_probe,
	};

	static int __init qman_portal_driver_register(struct platform_driver *drv)
	{
	int ret;

	ret = platform_driver_register(drv);
	if (ret < 0)
	return ret;

	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
	"soc/qman_portal:online",
	qman_online_cpu, qman_offline_cpu);
	if (ret < 0) {
	pr_err("qman: failed to register hotplug callbacks.\n");
	platform_driver_unregister(drv);
	return ret;
	}
	return 0;
	}

	module_driver(qman_portal_driver,
	qman_portal_driver_register, platform_driver_unregister);