fsl/qbman/bman_portal.c

0001 /* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
0002  *
0003  * Redistribution and use in source and binary forms, with or without
0004  * modification, are permitted provided that the following conditions are met:
0005  *     * Redistributions of source code must retain the above copyright
0006  *   notice, this list of conditions and the following disclaimer.
0007  *     * Redistributions in binary form must reproduce the above copyright
0008  *   notice, this list of conditions and the following disclaimer in the
0009  *   documentation and/or other materials provided with the distribution.
0010  *     * Neither the name of Freescale Semiconductor nor the
0011  *   names of its contributors may be used to endorse or promote products
0012  *   derived from this software without specific prior written permission.
0013  *
0014  * ALTERNATIVELY, this software may be distributed under the terms of the
0015  * GNU General Public License ("GPL") as published by the Free Software
0016  * Foundation, either version 2 of that License or (at your option) any
0017  * later version.
0018  *
0019  * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
0020  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
0021  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
0022  * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
0023  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
0024  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
0025  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
0026  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
0027  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
0028  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0029  */
0030
0031 #include "bman_priv.h"
0032
0033 static struct bman_portal *affine_bportals[NR_CPUS];
0034 static struct cpumask portal_cpus;
0035 static int __bman_portals_probed;
0036 /* protect bman global registers and global data shared among portals */
0037 static DEFINE_SPINLOCK(bman_lock);
0038
0039 static struct bman_portal *init_pcfg(struct bm_portal_config *pcfg)
0040 {
0041     struct bman_portal *p = bman_create_affine_portal(pcfg);
0042
0043     if (!p) {
0044         dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
0045              __func__, pcfg->cpu);
0046         return NULL;
0047     }
0048
0049     bman_p_irqsource_add(p, BM_PIRQ_RCRI);
0050     affine_bportals[pcfg->cpu] = p;
0051
0052     dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
0053
0054     return p;
0055 }
0056
0057 static int bman_offline_cpu(unsigned int cpu)
0058 {
0059     struct bman_portal *p = affine_bportals[cpu];
0060     const struct bm_portal_config *pcfg;
0061
0062     if (!p)
0063         return 0;
0064
0065     pcfg = bman_get_bm_portal_config(p);
0066     if (!pcfg)
0067         return 0;
0068
0069     /* use any other online CPU */
0070     cpu = cpumask_any_but(cpu_online_mask, cpu);
0071     irq_set_affinity(pcfg->irq, cpumask_of(cpu));
0072     return 0;
0073 }
0074
0075 static int bman_online_cpu(unsigned int cpu)
0076 {
0077     struct bman_portal *p = affine_bportals[cpu];
0078     const struct bm_portal_config *pcfg;
0079
0080     if (!p)
0081         return 0;
0082
0083     pcfg = bman_get_bm_portal_config(p);
0084     if (!pcfg)
0085         return 0;
0086
0087     irq_set_affinity(pcfg->irq, cpumask_of(cpu));
0088     return 0;
0089 }
0090
0091 int bman_portals_probed(void)
0092 {
0093     return __bman_portals_probed;
0094 }
0095 EXPORT_SYMBOL_GPL(bman_portals_probed);
0096
0097 static int bman_portal_probe(struct platform_device *pdev)
0098 {
0099     struct device *dev = &pdev->dev;
0100     struct device_node *node = dev->of_node;
0101     struct bm_portal_config *pcfg;
0102     struct resource *addr_phys[2];
0103     int irq, cpu, err, i;
0104
0105     err = bman_is_probed();
0106     if (!err)
0107         return -EPROBE_DEFER;
0108     if (err < 0) {
0109         dev_err(&pdev->dev, "failing probe due to bman probe error\n");
0110         return -ENODEV;
0111     }
0112
0113     pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
0114     if (!pcfg) {
0115         __bman_portals_probed = -1;
0116         return -ENOMEM;
0117     }
0118
0119     pcfg->dev = dev;
0120
0121     addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
0122                          DPAA_PORTAL_CE);
0123     if (!addr_phys[0]) {
0124         dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
0125         goto err_ioremap1;
0126     }
0127
0128     addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
0129                          DPAA_PORTAL_CI);
0130     if (!addr_phys[1]) {
0131         dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
0132         goto err_ioremap1;
0133     }
0134
0135     pcfg->cpu = -1;
0136
0137     irq = platform_get_irq(pdev, 0);
0138     if (irq <= 0)
0139         goto err_ioremap1;
0140     pcfg->irq = irq;
0141
0142     pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
0143                     resource_size(addr_phys[0]),
0144                     QBMAN_MEMREMAP_ATTR);
0145     if (!pcfg->addr_virt_ce) {
0146         dev_err(dev, "memremap::CE failed\n");
0147         goto err_ioremap1;
0148     }
0149
0150     pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
0151                     resource_size(addr_phys[1]));
0152     if (!pcfg->addr_virt_ci) {
0153         dev_err(dev, "ioremap::CI failed\n");
0154         goto err_ioremap2;
0155     }
0156
0157     spin_lock(&bman_lock);
0158     cpu = cpumask_first_zero(&portal_cpus);
0159     if (cpu >= nr_cpu_ids) {
0160         __bman_portals_probed = 1;
0161         /* unassigned portal, skip init */
0162         spin_unlock(&bman_lock);
0163         goto check_cleanup;
0164     }
0165
0166     cpumask_set_cpu(cpu, &portal_cpus);
0167     spin_unlock(&bman_lock);
0168     pcfg->cpu = cpu;
0169
0170     if (!init_pcfg(pcfg)) {
0171         dev_err(dev, "portal init failed\n");
0172         goto err_portal_init;
0173     }
0174
0175     /* clear irq affinity if assigned cpu is offline */
0176     if (!cpu_online(cpu))
0177         bman_offline_cpu(cpu);
0178
0179 check_cleanup:
0180     if (__bman_portals_probed == 1 && bman_requires_cleanup()) {
0181         /*
0182          * BMan wasn't reset prior to boot (Kexec for example)
0183          * Empty all the buffer pools so they are in reset state
0184          */
0185         for (i = 0; i < BM_POOL_MAX; i++) {
0186             err =  bm_shutdown_pool(i);
0187             if (err) {
0188                 dev_err(dev, "Failed to shutdown bpool %d\n",
0189                     i);
0190                 goto err_portal_init;
0191             }
0192         }
0193         bman_done_cleanup();
0194     }
0195
0196     return 0;
0197
0198 err_portal_init:
0199     iounmap(pcfg->addr_virt_ci);
0200 err_ioremap2:
0201     memunmap(pcfg->addr_virt_ce);
0202 err_ioremap1:
0203      __bman_portals_probed = -1;
0204
0205     return -ENXIO;
0206 }
0207
0208 static const struct of_device_id bman_portal_ids[] = {
0209     {
0210         .compatible = "fsl,bman-portal",
0211     },
0212     {}
0213 };
0214 MODULE_DEVICE_TABLE(of, bman_portal_ids);
0215
0216 static struct platform_driver bman_portal_driver = {
0217     .driver = {
0218         .name = KBUILD_MODNAME,
0219         .of_match_table = bman_portal_ids,
0220     },
0221     .probe = bman_portal_probe,
0222 };
0223
0224 static int __init bman_portal_driver_register(struct platform_driver *drv)
0225 {
0226     int ret;
0227
0228     ret = platform_driver_register(drv);
0229     if (ret < 0)
0230         return ret;
0231
0232     ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
0233                     "soc/qbman_portal:online",
0234                     bman_online_cpu, bman_offline_cpu);
0235     if (ret < 0) {
0236         pr_err("bman: failed to register hotplug callbacks.\n");
0237         platform_driver_unregister(drv);
0238         return ret;
0239     }
0240     return 0;
0241 }
0242
0243 module_driver(bman_portal_driver,
0244           bman_portal_driver_register, platform_driver_unregister);