1 /* Copyright 2008 - 2016 Freescale Semiconductor, Inc. 2 * 3 * Redistribution and use in source and binary forms, with or without 4 * modification, are permitted provided that the following conditions are met: 5 * * Redistributions of source code must retain the above copyright 6 * notice, this list of conditions and the following disclaimer. 7 * * Redistributions in binary form must reproduce the above copyright 8 * notice, this list of conditions and the following disclaimer in the 9 * documentation and/or other materials provided with the distribution. 10 * * Neither the name of Freescale Semiconductor nor the 11 * names of its contributors may be used to endorse or promote products 12 * derived from this software without specific prior written permission. 13 * 14 * ALTERNATIVELY, this software may be distributed under the terms of the 15 * GNU General Public License ("GPL") as published by the Free Software 16 * Foundation, either version 2 of that License or (at your option) any 17 * later version. 18 * 19 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY 20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY 23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "bman_priv.h" 32 33 static struct bman_portal *affine_bportals[NR_CPUS]; 34 static struct cpumask portal_cpus; 35 /* protect bman global registers and global data shared among portals */ 36 static DEFINE_SPINLOCK(bman_lock); 37 38 static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg) 39 { 40 struct bman_portal *p = bman_create_affine_portal(pcfg); 41 42 if (!p) { 43 dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n", 44 __func__, pcfg->cpu); 45 return NULL; 46 } 47 48 bman_p_irqsource_add(p, BM_PIRQ_RCRI); 49 affine_bportals[pcfg->cpu] = p; 50 51 dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu); 52 53 return p; 54 } 55 56 static void bman_offline_cpu(unsigned int cpu) 57 { 58 struct bman_portal *p = affine_bportals[cpu]; 59 const struct bm_portal_config *pcfg; 60 61 if (!p) 62 return; 63 64 pcfg = bman_get_bm_portal_config(p); 65 if (!pcfg) 66 return; 67 68 irq_set_affinity(pcfg->irq, cpumask_of(0)); 69 } 70 71 static void bman_online_cpu(unsigned int cpu) 72 { 73 struct bman_portal *p = affine_bportals[cpu]; 74 const struct bm_portal_config *pcfg; 75 76 if (!p) 77 return; 78 79 pcfg = bman_get_bm_portal_config(p); 80 if (!pcfg) 81 return; 82 83 irq_set_affinity(pcfg->irq, cpumask_of(cpu)); 84 } 85 86 static int bman_hotplug_cpu_callback(struct notifier_block *nfb, 87 unsigned long action, void *hcpu) 88 { 89 unsigned int cpu = (unsigned long)hcpu; 90 91 switch (action) { 92 case CPU_ONLINE: 93 case CPU_ONLINE_FROZEN: 94 bman_online_cpu(cpu); 95 break; 96 case CPU_DOWN_PREPARE: 97 case CPU_DOWN_PREPARE_FROZEN: 98 bman_offline_cpu(cpu); 99 } 100 101 return NOTIFY_OK; 102 } 103 104 static struct notifier_block bman_hotplug_cpu_notifier = { 105 .notifier_call = bman_hotplug_cpu_callback, 106 }; 107 108 static int bman_portal_probe(struct platform_device *pdev) 109 { 110 struct device *dev = &pdev->dev; 111 struct device_node *node = dev->of_node; 112 struct bm_portal_config *pcfg; 113 struct resource *addr_phys[2]; 114 void __iomem *va; 115 int irq, cpu; 116 117 pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL); 118 if (!pcfg) 119 return -ENOMEM; 120 121 pcfg->dev = dev; 122 123 addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM, 124 DPAA_PORTAL_CE); 125 if (!addr_phys[0]) { 126 dev_err(dev, "Can't get %s property 'reg::CE'\n", 127 node->full_name); 128 return -ENXIO; 129 } 130 131 addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM, 132 DPAA_PORTAL_CI); 133 if (!addr_phys[1]) { 134 dev_err(dev, "Can't get %s property 'reg::CI'\n", 135 node->full_name); 136 return -ENXIO; 137 } 138 139 pcfg->cpu = -1; 140 141 irq = platform_get_irq(pdev, 0); 142 if (irq <= 0) { 143 dev_err(dev, "Can't get %s IRQ'\n", node->full_name); 144 return -ENXIO; 145 } 146 pcfg->irq = irq; 147 148 va = ioremap_prot(addr_phys[0]->start, resource_size(addr_phys[0]), 0); 149 if (!va) 150 goto err_ioremap1; 151 152 pcfg->addr_virt[DPAA_PORTAL_CE] = va; 153 154 va = ioremap_prot(addr_phys[1]->start, resource_size(addr_phys[1]), 155 _PAGE_GUARDED | _PAGE_NO_CACHE); 156 if (!va) 157 goto err_ioremap2; 158 159 pcfg->addr_virt[DPAA_PORTAL_CI] = va; 160 161 spin_lock(&bman_lock); 162 cpu = cpumask_next_zero(-1, &portal_cpus); 163 if (cpu >= nr_cpu_ids) { 164 /* unassigned portal, skip init */ 165 spin_unlock(&bman_lock); 166 return 0; 167 } 168 169 cpumask_set_cpu(cpu, &portal_cpus); 170 spin_unlock(&bman_lock); 171 pcfg->cpu = cpu; 172 173 if (!init_pcfg(pcfg)) 174 goto err_ioremap2; 175 176 /* clear irq affinity if assigned cpu is offline */ 177 if (!cpu_online(cpu)) 178 bman_offline_cpu(cpu); 179 180 return 0; 181 182 err_ioremap2: 183 iounmap(pcfg->addr_virt[DPAA_PORTAL_CE]); 184 err_ioremap1: 185 dev_err(dev, "ioremap failed\n"); 186 return -ENXIO; 187 } 188 189 static const struct of_device_id bman_portal_ids[] = { 190 { 191 .compatible = "fsl,bman-portal", 192 }, 193 {} 194 }; 195 MODULE_DEVICE_TABLE(of, bman_portal_ids); 196 197 static struct platform_driver bman_portal_driver = { 198 .driver = { 199 .name = KBUILD_MODNAME, 200 .of_match_table = bman_portal_ids, 201 }, 202 .probe = bman_portal_probe, 203 }; 204 205 static int __init bman_portal_driver_register(struct platform_driver *drv) 206 { 207 int ret; 208 209 ret = platform_driver_register(drv); 210 if (ret < 0) 211 return ret; 212 213 register_hotcpu_notifier(&bman_hotplug_cpu_notifier); 214 215 return 0; 216 } 217 218 module_driver(bman_portal_driver, 219 bman_portal_driver_register, platform_driver_unregister); 220