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 static int __bman_portals_probed; 36 /* protect bman global registers and global data shared among portals */ 37 static DEFINE_SPINLOCK(bman_lock); 38 39 static 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 57 static 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 75 static 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 91 int bman_portals_probed(void) 92 { 93 return __bman_portals_probed; 94 } 95 EXPORT_SYMBOL_GPL(bman_portals_probed); 96 97 static 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); 178 179 check_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 state 184 */ 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; 197 198 err_portal_init: 199 iounmap(pcfg->addr_virt_ci); 200 err_ioremap2: 201 memunmap(pcfg->addr_virt_ce); 202 err_ioremap1: 203 __bman_portals_probed = -1; 204 205 return -ENXIO; 206 } 207 208 static const struct of_device_id bman_portal_ids[] = { 209 { 210 .compatible = "fsl,bman-portal", 211 }, 212 {} 213 }; 214 MODULE_DEVICE_TABLE(of, bman_portal_ids); 215 216 static 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 }; 223 224 static 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 } 242 243 module_driver(bman_portal_driver, 244 bman_portal_driver_register, platform_driver_unregister); 245