drivers/soc/fsl/qbman/qman_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 "qman_priv.h"
  32
  33 struct qman_portal *qman_dma_portal;
  34 EXPORT_SYMBOL(qman_dma_portal);
  35
  36 /* Enable portal interupts (as opposed to polling mode) */
  37 #define CONFIG_FSL_DPA_PIRQ_SLOW  1
  38 #define CONFIG_FSL_DPA_PIRQ_FAST  1
  39
  40 static struct cpumask portal_cpus;
  41 /* protect qman global registers and global data shared among portals */
  42 static DEFINE_SPINLOCK(qman_lock);
  43
  44 static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
  45 {
  46 #ifdef CONFIG_FSL_PAMU
  47         struct device *dev = pcfg->dev;
  48         int window_count = 1;
  49         struct iommu_domain_geometry geom_attr;
  50         struct pamu_stash_attribute stash_attr;
  51         int ret;
  52
  53         pcfg->iommu_domain = iommu_domain_alloc(&platform_bus_type);
  54         if (!pcfg->iommu_domain) {
  55                 dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
  56                 goto no_iommu;
  57         }
  58         geom_attr.aperture_start = 0;
  59         geom_attr.aperture_end =
  60                 ((dma_addr_t)1 << min(8 * sizeof(dma_addr_t), (size_t)36)) - 1;
  61         geom_attr.force_aperture = true;
  62         ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_GEOMETRY,
  63                                     &geom_attr);
  64         if (ret < 0) {
  65                 dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
  66                         ret);
  67                 goto out_domain_free;
  68         }
  69         ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_WINDOWS,
  70                                     &window_count);
  71         if (ret < 0) {
  72                 dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
  73                         ret);
  74                 goto out_domain_free;
  75         }
  76         stash_attr.cpu = cpu;
  77         stash_attr.cache = PAMU_ATTR_CACHE_L1;
  78         ret = iommu_domain_set_attr(pcfg->iommu_domain,
  79                                     DOMAIN_ATTR_FSL_PAMU_STASH,
  80                                     &stash_attr);
  81         if (ret < 0) {
  82                 dev_err(dev, "%s(): iommu_domain_set_attr() = %d",
  83                         __func__, ret);
  84                 goto out_domain_free;
  85         }
  86         ret = iommu_domain_window_enable(pcfg->iommu_domain, 0, 0, 1ULL << 36,
  87                                          IOMMU_READ | IOMMU_WRITE);
  88         if (ret < 0) {
  89                 dev_err(dev, "%s(): iommu_domain_window_enable() = %d",
  90                         __func__, ret);
  91                 goto out_domain_free;
  92         }
  93         ret = iommu_attach_device(pcfg->iommu_domain, dev);
  94         if (ret < 0) {
  95                 dev_err(dev, "%s(): iommu_device_attach() = %d", __func__,
  96                         ret);
  97                 goto out_domain_free;
  98         }
  99         ret = iommu_domain_set_attr(pcfg->iommu_domain,
 100                                     DOMAIN_ATTR_FSL_PAMU_ENABLE,
 101                                     &window_count);
 102         if (ret < 0) {
 103                 dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
 104                         ret);
 105                 goto out_detach_device;
 106         }
 107
 108 no_iommu:
 109 #endif
 110         qman_set_sdest(pcfg->channel, cpu);
 111
 112         return;
 113
 114 #ifdef CONFIG_FSL_PAMU
 115 out_detach_device:
 116         iommu_detach_device(pcfg->iommu_domain, NULL);
 117 out_domain_free:
 118         iommu_domain_free(pcfg->iommu_domain);
 119         pcfg->iommu_domain = NULL;
 120 #endif
 121 }
 122
 123 static struct qman_portal *init_pcfg(struct qm_portal_config *pcfg)
 124 {
 125         struct qman_portal *p;
 126         u32 irq_sources = 0;
 127
 128         /* We need the same LIODN offset for all portals */
 129         qman_liodn_fixup(pcfg->channel);
 130
 131         pcfg->iommu_domain = NULL;
 132         portal_set_cpu(pcfg, pcfg->cpu);
 133
 134         p = qman_create_affine_portal(pcfg, NULL);
 135         if (!p) {
 136                 dev_crit(pcfg->dev, "%s: Portal failure on cpu %d\n",
 137                          __func__, pcfg->cpu);
 138                 return NULL;
 139         }
 140
 141         /* Determine what should be interrupt-vs-poll driven */
 142 #ifdef CONFIG_FSL_DPA_PIRQ_SLOW
 143         irq_sources |= QM_PIRQ_EQCI | QM_PIRQ_EQRI | QM_PIRQ_MRI |
 144                        QM_PIRQ_CSCI;
 145 #endif
 146 #ifdef CONFIG_FSL_DPA_PIRQ_FAST
 147         irq_sources |= QM_PIRQ_DQRI;
 148 #endif
 149         qman_p_irqsource_add(p, irq_sources);
 150
 151         spin_lock(&qman_lock);
 152         if (cpumask_equal(&portal_cpus, cpu_possible_mask)) {
 153                 /* all assigned portals are initialized now */
 154                 qman_init_cgr_all();
 155         }
 156
 157         if (!qman_dma_portal)
 158                 qman_dma_portal = p;
 159
 160         spin_unlock(&qman_lock);
 161
 162         dev_info(pcfg->dev, "Portal initialised, cpu %d\n", pcfg->cpu);
 163
 164         return p;
 165 }
 166
 167 static void qman_portal_update_sdest(const struct qm_portal_config *pcfg,
 168                                                         unsigned int cpu)
 169 {
 170 #ifdef CONFIG_FSL_PAMU /* TODO */
 171         struct pamu_stash_attribute stash_attr;
 172         int ret;
 173
 174         if (pcfg->iommu_domain) {
 175                 stash_attr.cpu = cpu;
 176                 stash_attr.cache = PAMU_ATTR_CACHE_L1;
 177                 ret = iommu_domain_set_attr(pcfg->iommu_domain,
 178                                 DOMAIN_ATTR_FSL_PAMU_STASH, &stash_attr);
 179                 if (ret < 0) {
 180                         dev_err(pcfg->dev,
 181                                 "Failed to update pamu stash setting\n");
 182                         return;
 183                 }
 184         }
 185 #endif
 186         qman_set_sdest(pcfg->channel, cpu);
 187 }
 188
 189 static int qman_offline_cpu(unsigned int cpu)
 190 {
 191         struct qman_portal *p;
 192         const struct qm_portal_config *pcfg;
 193
 194         p = affine_portals[cpu];
 195         if (p) {
 196                 pcfg = qman_get_qm_portal_config(p);
 197                 if (pcfg) {
 198                         irq_set_affinity(pcfg->irq, cpumask_of(0));
 199                         qman_portal_update_sdest(pcfg, 0);
 200                 }
 201         }
 202         return 0;
 203 }
 204
 205 static int qman_online_cpu(unsigned int cpu)
 206 {
 207         struct qman_portal *p;
 208         const struct qm_portal_config *pcfg;
 209
 210         p = affine_portals[cpu];
 211         if (p) {
 212                 pcfg = qman_get_qm_portal_config(p);
 213                 if (pcfg) {
 214                         irq_set_affinity(pcfg->irq, cpumask_of(cpu));
 215                         qman_portal_update_sdest(pcfg, cpu);
 216                 }
 217         }
 218         return 0;
 219 }
 220
 221 static int qman_portal_probe(struct platform_device *pdev)
 222 {
 223         struct device *dev = &pdev->dev;
 224         struct device_node *node = dev->of_node;
 225         struct qm_portal_config *pcfg;
 226         struct resource *addr_phys[2];
 227         void __iomem *va;
 228         int irq, cpu, err;
 229         u32 val;
 230
 231         pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
 232         if (!pcfg)
 233                 return -ENOMEM;
 234
 235         pcfg->dev = dev;
 236
 237         addr_phys[0] = platform_get_resource(pdev, IORESOURCE_MEM,
 238                                              DPAA_PORTAL_CE);
 239         if (!addr_phys[0]) {
 240                 dev_err(dev, "Can't get %pOF property 'reg::CE'\n", node);
 241                 return -ENXIO;
 242         }
 243
 244         addr_phys[1] = platform_get_resource(pdev, IORESOURCE_MEM,
 245                                              DPAA_PORTAL_CI);
 246         if (!addr_phys[1]) {
 247                 dev_err(dev, "Can't get %pOF property 'reg::CI'\n", node);
 248                 return -ENXIO;
 249         }
 250
 251         err = of_property_read_u32(node, "cell-index", &val);
 252         if (err) {
 253                 dev_err(dev, "Can't get %pOF property 'cell-index'\n", node);
 254                 return err;
 255         }
 256         pcfg->channel = val;
 257         pcfg->cpu = -1;
 258         irq = platform_get_irq(pdev, 0);
 259         if (irq <= 0) {
 260                 dev_err(dev, "Can't get %pOF IRQ\n", node);
 261                 return -ENXIO;
 262         }
 263         pcfg->irq = irq;
 264
 265         va = ioremap_prot(addr_phys[0]->start, resource_size(addr_phys[0]), 0);
 266         if (!va) {
 267                 dev_err(dev, "ioremap::CE failed\n");
 268                 goto err_ioremap1;
 269         }
 270
 271         pcfg->addr_virt[DPAA_PORTAL_CE] = va;
 272
 273         va = ioremap_prot(addr_phys[1]->start, resource_size(addr_phys[1]),
 274                           _PAGE_GUARDED | _PAGE_NO_CACHE);
 275         if (!va) {
 276                 dev_err(dev, "ioremap::CI failed\n");
 277                 goto err_ioremap2;
 278         }
 279
 280         pcfg->addr_virt[DPAA_PORTAL_CI] = va;
 281
 282         pcfg->pools = qm_get_pools_sdqcr();
 283
 284         spin_lock(&qman_lock);
 285         cpu = cpumask_next_zero(-1, &portal_cpus);
 286         if (cpu >= nr_cpu_ids) {
 287                 /* unassigned portal, skip init */
 288                 spin_unlock(&qman_lock);
 289                 return 0;
 290         }
 291
 292         cpumask_set_cpu(cpu, &portal_cpus);
 293         spin_unlock(&qman_lock);
 294         pcfg->cpu = cpu;
 295
 296         if (dma_set_mask(dev, DMA_BIT_MASK(40))) {
 297                 dev_err(dev, "dma_set_mask() failed\n");
 298                 goto err_portal_init;
 299         }
 300
 301         if (!init_pcfg(pcfg)) {
 302                 dev_err(dev, "portal init failed\n");
 303                 goto err_portal_init;
 304         }
 305
 306         /* clear irq affinity if assigned cpu is offline */
 307         if (!cpu_online(cpu))
 308                 qman_offline_cpu(cpu);
 309
 310         return 0;
 311
 312 err_portal_init:
 313         iounmap(pcfg->addr_virt[DPAA_PORTAL_CI]);
 314 err_ioremap2:
 315         iounmap(pcfg->addr_virt[DPAA_PORTAL_CE]);
 316 err_ioremap1:
 317         return -ENXIO;
 318 }
 319
 320 static const struct of_device_id qman_portal_ids[] = {
 321         {
 322                 .compatible = "fsl,qman-portal",
 323         },
 324         {}
 325 };
 326 MODULE_DEVICE_TABLE(of, qman_portal_ids);
 327
 328 static struct platform_driver qman_portal_driver = {
 329         .driver = {
 330                 .name = KBUILD_MODNAME,
 331                 .of_match_table = qman_portal_ids,
 332         },
 333         .probe = qman_portal_probe,
 334 };
 335
 336 static int __init qman_portal_driver_register(struct platform_driver *drv)
 337 {
 338         int ret;
 339
 340         ret = platform_driver_register(drv);
 341         if (ret < 0)
 342                 return ret;
 343
 344         ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
 345                                         "soc/qman_portal:online",
 346                                         qman_online_cpu, qman_offline_cpu);
 347         if (ret < 0) {
 348                 pr_err("qman: failed to register hotplug callbacks.\n");
 349                 platform_driver_unregister(drv);
 350                 return ret;
 351         }
 352         return 0;
 353 }
 354
 355 module_driver(qman_portal_driver,
 356               qman_portal_driver_register, platform_driver_unregister);