LXR linux/drivers/soc/fsl/qbman/bman

   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
  33static struct bman_portal *affine_bportals[NR_CPUS];
  34static struct cpumask portal_cpus;
  35/* protect bman global registers and global data shared among portals */
  36static DEFINE_SPINLOCK(bman_lock);
  37
  38static 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
  56static 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
  74static 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
  90static 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
 173err_portal_init:
 174        iounmap(pcfg->addr_virt_ci);
 175err_ioremap2:
 176        memunmap(pcfg->addr_virt_ce);
 177err_ioremap1:
 178        return -ENXIO;
 179}
 180
 181static const struct of_device_id bman_portal_ids[] = {
 182        {
 183                .compatible = "fsl,bman-portal",
 184        },
 185        {}
 186};
 187MODULE_DEVICE_TABLE(of, bman_portal_ids);
 188
 189static 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
 197static 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
 216module_driver(bman_portal_driver,
 217              bman_portal_driver_register, platform_driver_unregister);
 218