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 int 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 0; 63 64 pcfg = bman_get_bm_portal_config(p); 65 if (!pcfg) 66 return 0; 67 68 /* use any other online CPU */ 69 cpu = cpumask_any_but(cpu_online_mask, cpu); 70 irq_set_affinity(pcfg->irq, cpumask_of(cpu)); 71 return 0; 72 } 73 74 static int bman_online_cpu(unsigned int cpu) 75 { 76 struct bman_portal *p = affine_bportals[cpu]; 77 const struct bm_portal_config *pcfg; 78 79 if (!p) 80 return 0; 81 82 pcfg = bman_get_bm_portal_config(p); 83 if (!pcfg) 84 return 0; 85 86 irq_set_affinity(pcfg->irq, cpumask_of(cpu)); 87 return 0; 88 } 89 90 static int bman_portal_probe(struct platform_device *pdev) 91 { 92 struct device *dev = &pdev->dev; 93 struct device_node *node = dev->of_node; 94 struct bm_portal_config *pcfg; 95 struct resource *addr_phys[2]; 96 int irq, cpu, err; 97 98 err = bman_is_probed(); 99 if (!err) 100 return -EPROBE_DEFER; 101 if (err < 0) { 102 dev_err(&pdev->dev, "failing probe due to bman probe error\n"); 103 return -ENODEV; 104 } 105 106 pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL); 107 if (!pcfg) 108 return -ENOMEM; 109 110 pcfg->dev = dev; 111 112 addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM, 113 DPAA_PORTAL_CE); 114 if (!addr_phys[0]) { 115 dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node); 116 return -ENXIO; 117 } 118 119 addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM, 120 DPAA_PORTAL_CI); 121 if (!addr_phys[1]) { 122 dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node); 123 return -ENXIO; 124 } 125 126 pcfg->cpu = -1; 127 128 irq = platform_get_irq(pdev, 0); 129 if (irq <= 0) { 130 dev_err(dev, "Can't get %pOF IRQ'\n", node); 131 return -ENXIO; 132 } 133 pcfg->irq = irq; 134 135 pcfg->addr_virt_ce = memremap(addr_phys[0]->start, 136 resource_size(addr_phys[0]), 137 QBMAN_MEMREMAP_ATTR); 138 if (!pcfg->addr_virt_ce) { 139 dev_err(dev, "memremap::CE failed\n"); 140 goto err_ioremap1; 141 } 142 143 pcfg->addr_virt_ci = ioremap(addr_phys[1]->start, 144 resource_size(addr_phys[1])); 145 if (!pcfg->addr_virt_ci) { 146 dev_err(dev, "ioremap::CI failed\n"); 147 goto err_ioremap2; 148 } 149 150 spin_lock(&bman_lock); 151 cpu = cpumask_next_zero(-1, &portal_cpus); 152 if (cpu >= nr_cpu_ids) { 153 /* unassigned portal, skip init */ 154 spin_unlock(&bman_lock); 155 return 0; 156 } 157 158 cpumask_set_cpu(cpu, &portal_cpus); 159 spin_unlock(&bman_lock); 160 pcfg->cpu = cpu; 161 162 if (!init_pcfg(pcfg)) { 163 dev_err(dev, "portal init failed\n"); 164 goto err_portal_init; 165 } 166 167 /* clear irq affinity if assigned cpu is offline */ 168 if (!cpu_online(cpu)) 169 bman_offline_cpu(cpu); 170 171 return 0; 172 173 err_portal_init: 174 iounmap(pcfg->addr_virt_ci); 175 err_ioremap2: 176 memunmap(pcfg->addr_virt_ce); 177 err_ioremap1: 178 return -ENXIO; 179 } 180 181 static const struct of_device_id bman_portal_ids[] = { 182 { 183 .compatible = "fsl,bman-portal", 184 }, 185 {} 186 }; 187 MODULE_DEVICE_TABLE(of, bman_portal_ids); 188 189 static struct platform_driver bman_portal_driver = { 190 .driver = { 191 .name = KBUILD_MODNAME, 192 .of_match_table = bman_portal_ids, 193 }, 194 .probe = bman_portal_probe, 195 }; 196 197 static int __init bman_portal_driver_register(struct platform_driver *drv) 198 { 199 int ret; 200 201 ret = platform_driver_register(drv); 202 if (ret < 0) 203 return ret; 204 205 ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, 206 "soc/qbman_portal:online", 207 bman_online_cpu, bman_offline_cpu); 208 if (ret < 0) { 209 pr_err("bman: failed to register hotplug callbacks.\n"); 210 platform_driver_unregister(drv); 211 return ret; 212 } 213 return 0; 214 } 215 216 module_driver(bman_portal_driver, 217 bman_portal_driver_register, platform_driver_unregister); 218