fsl/qbman/qman_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 "qman_priv.h"
0032
0033 struct qman_portal *qman_dma_portal;
0034 EXPORT_SYMBOL(qman_dma_portal);
0035
0036 /* Enable portal interupts (as opposed to polling mode) */
0037 #define CONFIG_FSL_DPA_PIRQ_SLOW  1
0038 #define CONFIG_FSL_DPA_PIRQ_FAST  1
0039
0040 static struct cpumask portal_cpus;
0041 static int __qman_portals_probed;
0042 /* protect qman global registers and global data shared among portals */
0043 static DEFINE_SPINLOCK(qman_lock);
0044
0045 static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
0046 {
0047 #ifdef CONFIG_FSL_PAMU
0048     struct device *dev = pcfg->dev;
0049     int ret;
0050
0051     pcfg->iommu_domain = iommu_domain_alloc(&platform_bus_type);
0052     if (!pcfg->iommu_domain) {
0053         dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
0054         goto no_iommu;
0055     }
0056     ret = fsl_pamu_configure_l1_stash(pcfg->iommu_domain, cpu);
0057     if (ret < 0) {
0058         dev_err(dev, "%s(): fsl_pamu_configure_l1_stash() = %d",
0059             __func__, ret);
0060         goto out_domain_free;
0061     }
0062     ret = iommu_attach_device(pcfg->iommu_domain, dev);
0063     if (ret < 0) {
0064         dev_err(dev, "%s(): iommu_device_attach() = %d", __func__,
0065             ret);
0066         goto out_domain_free;
0067     }
0068
0069 no_iommu:
0070 #endif
0071     qman_set_sdest(pcfg->channel, cpu);
0072
0073     return;
0074
0075 #ifdef CONFIG_FSL_PAMU
0076 out_domain_free:
0077     iommu_domain_free(pcfg->iommu_domain);
0078     pcfg->iommu_domain = NULL;
0079 #endif
0080 }
0081
0082 static struct qman_portal *init_pcfg(struct qm_portal_config *pcfg)
0083 {
0084     struct qman_portal *p;
0085     u32 irq_sources = 0;
0086
0087     /* We need the same LIODN offset for all portals */
0088     qman_liodn_fixup(pcfg->channel);
0089
0090     pcfg->iommu_domain = NULL;
0091     portal_set_cpu(pcfg, pcfg->cpu);
0092
0093     p = qman_create_affine_portal(pcfg, NULL);
0094     if (!p) {
0095         dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
0096              __func__, pcfg->cpu);
0097         return NULL;
0098     }
0099
0100     /* Determine what should be interrupt-vs-poll driven */
0101 #ifdef CONFIG_FSL_DPA_PIRQ_SLOW
0102     irq_sources |= QM_PIRQ_EQCI | QM_PIRQ_EQRI | QM_PIRQ_MRI |
0103                QM_PIRQ_CSCI;
0104 #endif
0105 #ifdef CONFIG_FSL_DPA_PIRQ_FAST
0106     irq_sources |= QM_PIRQ_DQRI;
0107 #endif
0108     qman_p_irqsource_add(p, irq_sources);
0109
0110     spin_lock(&qman_lock);
0111     if (cpumask_equal(&portal_cpus, cpu_possible_mask)) {
0112         /* all assigned portals are initialized now */
0113         qman_init_cgr_all();
0114     }
0115
0116     if (!qman_dma_portal)
0117         qman_dma_portal = p;
0118
0119     spin_unlock(&qman_lock);
0120
0121     dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
0122
0123     return p;
0124 }
0125
0126 static void qman_portal_update_sdest(const struct qm_portal_config *pcfg,
0127                             unsigned int cpu)
0128 {
0129 #ifdef CONFIG_FSL_PAMU /* TODO */
0130     if (pcfg->iommu_domain) {
0131         if (fsl_pamu_configure_l1_stash(pcfg->iommu_domain, cpu) < 0) {
0132             dev_err(pcfg->dev,
0133                 "Failed to update pamu stash setting\n");
0134             return;
0135         }
0136     }
0137 #endif
0138     qman_set_sdest(pcfg->channel, cpu);
0139 }
0140
0141 static int qman_offline_cpu(unsigned int cpu)
0142 {
0143     struct qman_portal *p;
0144     const struct qm_portal_config *pcfg;
0145
0146     p = affine_portals[cpu];
0147     if (p) {
0148         pcfg = qman_get_qm_portal_config(p);
0149         if (pcfg) {
0150             /* select any other online CPU */
0151             cpu = cpumask_any_but(cpu_online_mask, cpu);
0152             irq_set_affinity(pcfg->irq, cpumask_of(cpu));
0153             qman_portal_update_sdest(pcfg, cpu);
0154         }
0155     }
0156     return 0;
0157 }
0158
0159 static int qman_online_cpu(unsigned int cpu)
0160 {
0161     struct qman_portal *p;
0162     const struct qm_portal_config *pcfg;
0163
0164     p = affine_portals[cpu];
0165     if (p) {
0166         pcfg = qman_get_qm_portal_config(p);
0167         if (pcfg) {
0168             irq_set_affinity(pcfg->irq, cpumask_of(cpu));
0169             qman_portal_update_sdest(pcfg, cpu);
0170         }
0171     }
0172     return 0;
0173 }
0174
0175 int qman_portals_probed(void)
0176 {
0177     return __qman_portals_probed;
0178 }
0179 EXPORT_SYMBOL_GPL(qman_portals_probed);
0180
0181 static int qman_portal_probe(struct platform_device *pdev)
0182 {
0183     struct device *dev = &pdev->dev;
0184     struct device_node *node = dev->of_node;
0185     struct qm_portal_config *pcfg;
0186     struct resource *addr_phys[2];
0187     int irq, cpu, err, i;
0188     u32 val;
0189
0190     err = qman_is_probed();
0191     if (!err)
0192         return -EPROBE_DEFER;
0193     if (err < 0) {
0194         dev_err(&pdev->dev, "failing probe due to qman probe error\n");
0195         return -ENODEV;
0196     }
0197
0198     pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
0199     if (!pcfg) {
0200         __qman_portals_probed = -1;
0201         return -ENOMEM;
0202     }
0203
0204     pcfg->dev = dev;
0205
0206     addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
0207                          DPAA_PORTAL_CE);
0208     if (!addr_phys[0]) {
0209         dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
0210         goto err_ioremap1;
0211     }
0212
0213     addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
0214                          DPAA_PORTAL_CI);
0215     if (!addr_phys[1]) {
0216         dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
0217         goto err_ioremap1;
0218     }
0219
0220     err = of_property_read_u32(node, "cell-index", &val);
0221     if (err) {
0222         dev_err(dev, "Can't get %pOF property 'cell-index'\n", node);
0223         __qman_portals_probed = -1;
0224         return err;
0225     }
0226     pcfg->channel = val;
0227     pcfg->cpu = -1;
0228     irq = platform_get_irq(pdev, 0);
0229     if (irq <= 0)
0230         goto err_ioremap1;
0231     pcfg->irq = irq;
0232
0233     pcfg->addr_virt_ce = memremap(addr_phys[0]->start,
0234                     resource_size(addr_phys[0]),
0235                     QBMAN_MEMREMAP_ATTR);
0236     if (!pcfg->addr_virt_ce) {
0237         dev_err(dev, "memremap::CE failed\n");
0238         goto err_ioremap1;
0239     }
0240
0241     pcfg->addr_virt_ci = ioremap(addr_phys[1]->start,
0242                 resource_size(addr_phys[1]));
0243     if (!pcfg->addr_virt_ci) {
0244         dev_err(dev, "ioremap::CI failed\n");
0245         goto err_ioremap2;
0246     }
0247
0248     pcfg->pools = qm_get_pools_sdqcr();
0249
0250     spin_lock(&qman_lock);
0251     cpu = cpumask_first_zero(&portal_cpus);
0252     if (cpu >= nr_cpu_ids) {
0253         __qman_portals_probed = 1;
0254         /* unassigned portal, skip init */
0255         spin_unlock(&qman_lock);
0256         goto check_cleanup;
0257     }
0258
0259     cpumask_set_cpu(cpu, &portal_cpus);
0260     spin_unlock(&qman_lock);
0261     pcfg->cpu = cpu;
0262
0263     if (dma_set_mask(dev, DMA_BIT_MASK(40))) {
0264         dev_err(dev, "dma_set_mask() failed\n");
0265         goto err_portal_init;
0266     }
0267
0268     if (!init_pcfg(pcfg)) {
0269         dev_err(dev, "portal init failed\n");
0270         goto err_portal_init;
0271     }
0272
0273     /* clear irq affinity if assigned cpu is offline */
0274     if (!cpu_online(cpu))
0275         qman_offline_cpu(cpu);
0276
0277 check_cleanup:
0278     if (__qman_portals_probed == 1 && qman_requires_cleanup()) {
0279         /*
0280          * QMan wasn't reset prior to boot (Kexec for example)
0281          * Empty all the frame queues so they are in reset state
0282          */
0283         for (i = 0; i < qm_get_fqid_maxcnt(); i++) {
0284             err =  qman_shutdown_fq(i);
0285             if (err) {
0286                 dev_err(dev, "Failed to shutdown frame queue %d\n",
0287                     i);
0288                 goto err_portal_init;
0289             }
0290         }
0291         qman_done_cleanup();
0292     }
0293
0294     return 0;
0295
0296 err_portal_init:
0297     iounmap(pcfg->addr_virt_ci);
0298 err_ioremap2:
0299     memunmap(pcfg->addr_virt_ce);
0300 err_ioremap1:
0301     __qman_portals_probed = -1;
0302
0303     return -ENXIO;
0304 }
0305
0306 static const struct of_device_id qman_portal_ids[] = {
0307     {
0308         .compatible = "fsl,qman-portal",
0309     },
0310     {}
0311 };
0312 MODULE_DEVICE_TABLE(of, qman_portal_ids);
0313
0314 static struct platform_driver qman_portal_driver = {
0315     .driver = {
0316         .name = KBUILD_MODNAME,
0317         .of_match_table = qman_portal_ids,
0318     },
0319     .probe = qman_portal_probe,
0320 };
0321
0322 static int __init qman_portal_driver_register(struct platform_driver *drv)
0323 {
0324     int ret;
0325
0326     ret = platform_driver_register(drv);
0327     if (ret < 0)
0328         return ret;
0329
0330     ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
0331                     "soc/qman_portal:online",
0332                     qman_online_cpu, qman_offline_cpu);
0333     if (ret < 0) {
0334         pr_err("qman: failed to register hotplug callbacks.\n");
0335         platform_driver_unregister(drv);
0336         return ret;
0337     }
0338     return 0;
0339 }
0340
0341 module_driver(qman_portal_driver,
0342           qman_portal_driver_register, platform_driver_unregister);