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