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