drivers/soc/fsl/qbman/bman_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 "bman_priv.h"

 static struct bman_portal *affine_bportals[NR_CPUS];
 static struct cpumask portal_cpus;
 static int __bman_portals_probed;
 /* protect bman global registers and global data shared among portals */
 static DEFINE_SPINLOCK(bman_lock);

 static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg)
 {
 	struct bman_portal *p = bman_create_affine_portal(pcfg);

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

 	bman_p_irqsource_add(p, BM_PIRQ_RCRI);
 	affine_bportals[pcfg->cpu] = p;

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

 	return p;
 }

 static int bman_offline_cpu(unsigned int cpu)
 {
 	struct bman_portal *p = affine_bportals[cpu];
 	const struct bm_portal_config *pcfg;

 	if (!p)
 		return 0;

 	pcfg = bman_get_bm_portal_config(p);
 	if (!pcfg)
 		return 0;

 	/* use any other online CPU */
 	cpu = cpumask_any_but(cpu_online_mask, cpu);
 	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
 	return 0;
 }

 static int bman_online_cpu(unsigned int cpu)
 {
 	struct bman_portal *p = affine_bportals[cpu];
 	const struct bm_portal_config *pcfg;

 	if (!p)
 		return 0;

 	pcfg = bman_get_bm_portal_config(p);
 	if (!pcfg)
 		return 0;

 	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
 	return 0;
 }

 int bman_portals_probed(void)
 {
 	return __bman_portals_probed;
 }
 EXPORT_SYMBOL_GPL(bman_portals_probed);

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

 	err = bman_is_probed();
 	if (!err)
 		return -EPROBE_DEFER;
 	if (err < 0) {
 		dev_err(&pdev->dev, "failing probe due to bman probe error\n");
 		return -ENODEV;
 	}

 	pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
 	if (!pcfg) {
 		__bman_portals_probed = -1;
 		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);
 		goto err_ioremap1;
 	}

 	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);
 		goto err_ioremap1;
 	}

 	pcfg->cpu = -1;

 	irq = platform_get_irq(pdev, 0);
 	if (irq <= 0)
 		goto err_ioremap1;
 	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;
 	}

 	spin_lock(&bman_lock);
 	cpu = cpumask_first_zero(&portal_cpus);
 	if (cpu >= nr_cpu_ids) {
 		__bman_portals_probed = 1;
 		/* unassigned portal, skip init */
 		spin_unlock(&bman_lock);
 		goto check_cleanup;
 	}

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

 	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))
 		bman_offline_cpu(cpu);

 check_cleanup:
 	if (__bman_portals_probed == 1 && bman_requires_cleanup()) {
 		/*
 		 * BMan wasn't reset prior to boot (Kexec for example)
 		 * Empty all the buffer pools so they are in reset state
 		 */
 		for (i = 0; i < BM_POOL_MAX; i++) {
 			err =  bm_shutdown_pool(i);
 			if (err) {
 				dev_err(dev, "Failed to shutdown bpool %d\n",
 					i);
 				goto err_portal_init;
 			}
 		}
 		bman_done_cleanup();
 	}

 	return 0;

 err_portal_init:
 	iounmap(pcfg->addr_virt_ci);
 err_ioremap2:
 	memunmap(pcfg->addr_virt_ce);
 err_ioremap1:
 	 __bman_portals_probed = -1;

 	return -ENXIO;
 }

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

 static struct platform_driver bman_portal_driver = {
 	.driver = {
 		.name = KBUILD_MODNAME,
 		.of_match_table = bman_portal_ids,
 	},
 	.probe = bman_portal_probe,
 };

 static int __init bman_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/qbman_portal:online",
 					bman_online_cpu, bman_offline_cpu);
 	if (ret < 0) {
 		pr_err("bman: failed to register hotplug callbacks.\n");
 		platform_driver_unregister(drv);
 		return ret;
 	}
 	return 0;
 }

 module_driver(bman_portal_driver,
 	      bman_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 "bman_priv.h"

	static struct bman_portal *affine_bportals[NR_CPUS];
	static struct cpumask portal_cpus;
	static int __bman_portals_probed;
	/* protect bman global registers and global data shared among portals */
	static DEFINE_SPINLOCK(bman_lock);

	static struct bman_portal init_pcfg(struct bm_portal_config pcfg)
	{
	struct bman_portal *p = bman_create_affine_portal(pcfg);

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

	bman_p_irqsource_add(p, BM_PIRQ_RCRI);
	affine_bportals[pcfg->cpu] = p;

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

	return p;
	}

	static int bman_offline_cpu(unsigned int cpu)
	{
	struct bman_portal *p = affine_bportals[cpu];
	const struct bm_portal_config *pcfg;

	if (!p)
	return 0;

	pcfg = bman_get_bm_portal_config(p);
	if (!pcfg)
	return 0;

	/* use any other online CPU */
	cpu = cpumask_any_but(cpu_online_mask, cpu);
	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
	return 0;
	}

	static int bman_online_cpu(unsigned int cpu)
	{
	struct bman_portal *p = affine_bportals[cpu];
	const struct bm_portal_config *pcfg;

	if (!p)
	return 0;

	pcfg = bman_get_bm_portal_config(p);
	if (!pcfg)
	return 0;

	irq_set_affinity(pcfg->irq, cpumask_of(cpu));
	return 0;
	}

	int bman_portals_probed(void)
	{
	return __bman_portals_probed;
	}
	EXPORT_SYMBOL_GPL(bman_portals_probed);

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

	err = bman_is_probed();
	if (!err)
	return -EPROBE_DEFER;
	if (err < 0) {
	dev_err(&pdev->dev, "failing probe due to bman probe error\n");
	return -ENODEV;
	}

	pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
	if (!pcfg) {
	__bman_portals_probed = -1;
	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);
	goto err_ioremap1;
	}

	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);
	goto err_ioremap1;
	}

	pcfg->cpu = -1;

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0)
	goto err_ioremap1;
	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;
	}

	spin_lock(&bman_lock);
	cpu = cpumask_first_zero(&portal_cpus);
	if (cpu >= nr_cpu_ids) {
	__bman_portals_probed = 1;
	/* unassigned portal, skip init */
	spin_unlock(&bman_lock);
	goto check_cleanup;
	}

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

	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))
	bman_offline_cpu(cpu);

	check_cleanup:
	if (__bman_portals_probed == 1 && bman_requires_cleanup()) {
	/*
	* BMan wasn't reset prior to boot (Kexec for example)
	* Empty all the buffer pools so they are in reset state
	*/
	for (i = 0; i < BM_POOL_MAX; i++) {
	err = bm_shutdown_pool(i);
	if (err) {
	dev_err(dev, "Failed to shutdown bpool %d\n",
	i);
	goto err_portal_init;
	}
	}
	bman_done_cleanup();
	}

	return 0;

	err_portal_init:
	iounmap(pcfg->addr_virt_ci);
	err_ioremap2:
	memunmap(pcfg->addr_virt_ce);
	err_ioremap1:
	__bman_portals_probed = -1;

	return -ENXIO;
	}

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

	static struct platform_driver bman_portal_driver = {
	.driver = {
	.name = KBUILD_MODNAME,
	.of_match_table = bman_portal_ids,
	},
	.probe = bman_portal_probe,
	};

	static int __init bman_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/qbman_portal:online",
	bman_online_cpu, bman_offline_cpu);
	if (ret < 0) {
	pr_err("bman: failed to register hotplug callbacks.\n");
	platform_driver_unregister(drv);
	return ret;
	}
	return 0;
	}

	module_driver(bman_portal_driver,
	bman_portal_driver_register, platform_driver_unregister);