/* 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"

/* 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();
	}
	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 void 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);
		}
	}
}

static void 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);
		}
	}
}

static int qman_hotplug_cpu_callback(struct notifier_block *nfb,
				     unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;

	switch (action) {
	case CPU_ONLINE:
	case CPU_ONLINE_FROZEN:
		qman_online_cpu(cpu);
		break;
	case CPU_DOWN_PREPARE:
	case CPU_DOWN_PREPARE_FROZEN:
		qman_offline_cpu(cpu);
	default:
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block qman_hotplug_cpu_notifier = {
	.notifier_call = qman_hotplug_cpu_callback,
};

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];
	const u32 *channel;
	void __iomem *va;
	int irq, len, cpu;

	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 %s property 'reg::CE'\n",
			node->full_name);
		return -ENXIO;
	}

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

	channel = of_get_property(node, "cell-index", &len);
	if (!channel || (len != 4)) {
		dev_err(dev, "Can't get %s property 'cell-index'\n",
			node->full_name);
		return -ENXIO;
	}
	pcfg->channel = *channel;
	pcfg->cpu = -1;
	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		dev_err(dev, "Can't get %s IRQ\n", node->full_name);
		return -ENXIO;
	}
	pcfg->irq = irq;

	va = ioremap_prot(addr_phys[0]->start, resource_size(addr_phys[0]), 0);
	if (!va)
		goto err_ioremap1;

	pcfg->addr_virt[DPAA_PORTAL_CE] = va;

	va = ioremap_prot(addr_phys[1]->start, resource_size(addr_phys[1]),
			  _PAGE_GUARDED | _PAGE_NO_CACHE);
	if (!va)
		goto err_ioremap2;

	pcfg->addr_virt[DPAA_PORTAL_CI] = va;

	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 (!init_pcfg(pcfg))
		goto err_ioremap2;

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

	return 0;

err_ioremap2:
	iounmap(pcfg->addr_virt[DPAA_PORTAL_CE]);
err_ioremap1:
	dev_err(dev, "ioremap failed\n");
	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;

	register_hotcpu_notifier(&qman_hotplug_cpu_notifier);

	return 0;
}

module_driver(qman_portal_driver,
	      qman_portal_driver_register, platform_driver_unregister);