drivers/soc/fsl/qbman/bman_portal.c

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