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1/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.2 *3 * Redistribution and use in source and binary forms, with or without4 * modification, are permitted provided that the following conditions are met:5 * * Redistributions of source code must retain the above copyright6 * notice, this list of conditions and the following disclaimer.7 * * Redistributions in binary form must reproduce the above copyright8 * notice, this list of conditions and the following disclaimer in the9 * documentation and/or other materials provided with the distribution.10 * * Neither the name of Freescale Semiconductor nor the11 * names of its contributors may be used to endorse or promote products12 * derived from this software without specific prior written permission.13 *14 * ALTERNATIVELY, this software may be distributed under the terms of the15 * GNU General Public License ("GPL") as published by the Free Software16 * Foundation, either version 2 of that License or (at your option) any17 * later version.18 *19 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE22 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.29 */30 31#include "bman_priv.h"32 33static struct bman_portal *affine_bportals[NR_CPUS];34static struct cpumask portal_cpus;35static int __bman_portals_probed;36/* protect bman global registers and global data shared among portals */37static DEFINE_SPINLOCK(bman_lock);38 39static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg)40{41 struct bman_portal *p = bman_create_affine_portal(pcfg);42 43 if (!p) {44 dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",45 __func__, pcfg->cpu);46 return NULL;47 }48 49 bman_p_irqsource_add(p, BM_PIRQ_RCRI);50 affine_bportals[pcfg->cpu] = p;51 52 dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);53 54 return p;55}56 57static int bman_offline_cpu(unsigned int cpu)58{59 struct bman_portal *p = affine_bportals[cpu];60 const struct bm_portal_config *pcfg;61 62 if (!p)63 return 0;64 65 pcfg = bman_get_bm_portal_config(p);66 if (!pcfg)67 return 0;68 69 /* use any other online CPU */70 cpu = cpumask_any_but(cpu_online_mask, cpu);71 irq_set_affinity(pcfg->irq, cpumask_of(cpu));72 return 0;73}74 75static int bman_online_cpu(unsigned int cpu)76{77 struct bman_portal *p = affine_bportals[cpu];78 const struct bm_portal_config *pcfg;79 80 if (!p)81 return 0;82 83 pcfg = bman_get_bm_portal_config(p);84 if (!pcfg)85 return 0;86 87 irq_set_affinity(pcfg->irq, cpumask_of(cpu));88 return 0;89}90 91int bman_portals_probed(void)92{93 return __bman_portals_probed;94}95EXPORT_SYMBOL_GPL(bman_portals_probed);96 97static int bman_portal_probe(struct platform_device *pdev)98{99 struct device *dev = &pdev->dev;100 struct device_node *node = dev->of_node;101 struct bm_portal_config *pcfg;102 struct resource *addr_phys[2];103 int irq, cpu, err, i;104 105 err = bman_is_probed();106 if (!err)107 return -EPROBE_DEFER;108 if (err < 0) {109 dev_err(&pdev->dev, "failing probe due to bman probe error\n");110 return -ENODEV;111 }112 113 pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);114 if (!pcfg) {115 __bman_portals_probed = -1;116 return -ENOMEM;117 }118 119 pcfg->dev = dev;120 121 addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,122 DPAA_PORTAL_CE);123 if (!addr_phys[0]) {124 dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);125 goto err_ioremap1;126 }127 128 addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,129 DPAA_PORTAL_CI);130 if (!addr_phys[1]) {131 dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);132 goto err_ioremap1;133 }134 135 pcfg->cpu = -1;136 137 irq = platform_get_irq(pdev, 0);138 if (irq <= 0)139 goto err_ioremap1;140 pcfg->irq = irq;141 142 pcfg->addr_virt_ce = memremap(addr_phys[0]->start,143 resource_size(addr_phys[0]),144 QBMAN_MEMREMAP_ATTR);145 if (!pcfg->addr_virt_ce) {146 dev_err(dev, "memremap::CE failed\n");147 goto err_ioremap1;148 }149 150 pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,151 resource_size(addr_phys[1]));152 if (!pcfg->addr_virt_ci) {153 dev_err(dev, "ioremap::CI failed\n");154 goto err_ioremap2;155 }156 157 spin_lock(&bman_lock);158 cpu = cpumask_first_zero(&portal_cpus);159 if (cpu >= nr_cpu_ids) {160 __bman_portals_probed = 1;161 /* unassigned portal, skip init */162 spin_unlock(&bman_lock);163 goto check_cleanup;164 }165 166 cpumask_set_cpu(cpu, &portal_cpus);167 spin_unlock(&bman_lock);168 pcfg->cpu = cpu;169 170 if (!init_pcfg(pcfg)) {171 dev_err(dev, "portal init failed\n");172 goto err_portal_init;173 }174 175 /* clear irq affinity if assigned cpu is offline */176 if (!cpu_online(cpu))177 bman_offline_cpu(cpu);178 179check_cleanup:180 if (__bman_portals_probed == 1 && bman_requires_cleanup()) {181 /*182 * BMan wasn't reset prior to boot (Kexec for example)183 * Empty all the buffer pools so they are in reset state184 */185 for (i = 0; i < BM_POOL_MAX; i++) {186 err = bm_shutdown_pool(i);187 if (err) {188 dev_err(dev, "Failed to shutdown bpool %d\n",189 i);190 goto err_portal_init;191 }192 }193 bman_done_cleanup();194 }195 196 return 0;197 198err_portal_init:199 iounmap(pcfg->addr_virt_ci);200err_ioremap2:201 memunmap(pcfg->addr_virt_ce);202err_ioremap1:203 __bman_portals_probed = -1;204 205 return -ENXIO;206}207 208static const struct of_device_id bman_portal_ids[] = {209 {210 .compatible = "fsl,bman-portal",211 },212 {}213};214MODULE_DEVICE_TABLE(of, bman_portal_ids);215 216static struct platform_driver bman_portal_driver = {217 .driver = {218 .name = KBUILD_MODNAME,219 .of_match_table = bman_portal_ids,220 },221 .probe = bman_portal_probe,222};223 224static int __init bman_portal_driver_register(struct platform_driver *drv)225{226 int ret;227 228 ret = platform_driver_register(drv);229 if (ret < 0)230 return ret;231 232 ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,233 "soc/qbman_portal:online",234 bman_online_cpu, bman_offline_cpu);235 if (ret < 0) {236 pr_err("bman: failed to register hotplug callbacks.\n");237 platform_driver_unregister(drv);238 return ret;239 }240 return 0;241}242 243module_driver(bman_portal_driver,244 bman_portal_driver_register, platform_driver_unregister);245