drivers/crypto/caam/ctrl.c

   1 /*
   2  * CAAM control-plane driver backend
   3  * Controller-level driver, kernel property detection, initialization
   4  *
   5  * Copyright 2008-2011 Freescale Semiconductor, Inc.
   6  */
   7
   8 #include "compat.h"
   9 #include "regs.h"
  10 #include "intern.h"
  11 #include "jr.h"
  12
  13 static int caam_remove(struct platform_device *pdev)
  14 {
  15         struct device *ctrldev;
  16         struct caam_drv_private *ctrlpriv;
  17         struct caam_drv_private_jr *jrpriv;
  18         struct caam_full __iomem *topregs;
  19         int ring, ret = 0;
  20
  21         ctrldev = &pdev->dev;
  22         ctrlpriv = dev_get_drvdata(ctrldev);
  23         topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;
  24
  25         /* shut down JobRs */
  26         for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {
  27                 ret |= caam_jr_shutdown(ctrlpriv->jrdev[ring]);
  28                 jrpriv = dev_get_drvdata(ctrlpriv->jrdev[ring]);
  29                 irq_dispose_mapping(jrpriv->irq);
  30         }
  31
  32         /* Shut down debug views */
  33 #ifdef CONFIG_DEBUG_FS
  34         debugfs_remove_recursive(ctrlpriv->dfs_root);
  35 #endif
  36
  37         /* Unmap controller region */
  38         iounmap(&topregs->ctrl);
  39
  40         kfree(ctrlpriv->jrdev);
  41         kfree(ctrlpriv);
  42
  43         return ret;
  44 }
  45
  46 /* Probe routine for CAAM top (controller) level */
  47 static int caam_probe(struct platform_device *pdev)
  48 {
  49         int d, ring, rspec;
  50         struct device *dev;
  51         struct device_node *nprop, *np;
  52         struct caam_ctrl __iomem *ctrl;
  53         struct caam_full __iomem *topregs;
  54         struct caam_drv_private *ctrlpriv;
  55         struct caam_perfmon *perfmon;
  56         struct caam_deco **deco;
  57         u32 deconum;
  58
  59         ctrlpriv = kzalloc(sizeof(struct caam_drv_private), GFP_KERNEL);
  60         if (!ctrlpriv)
  61                 return -ENOMEM;
  62
  63         dev = &pdev->dev;
  64         dev_set_drvdata(dev, ctrlpriv);
  65         ctrlpriv->pdev = pdev;
  66         nprop = pdev->dev.of_node;
  67
  68         /* Get configuration properties from device tree */
  69         /* First, get register page */
  70         ctrl = of_iomap(nprop, 0);
  71         if (ctrl == NULL) {
  72                 dev_err(dev, "caam: of_iomap() failed\n");
  73                 return -ENOMEM;
  74         }
  75         ctrlpriv->ctrl = (struct caam_ctrl __force *)ctrl;
  76
  77         /* topregs used to derive pointers to CAAM sub-blocks only */
  78         topregs = (struct caam_full __iomem *)ctrl;
  79
  80         /* Get the IRQ of the controller (for security violations only) */
  81         ctrlpriv->secvio_irq = of_irq_to_resource(nprop, 0, NULL);
  82
  83         /*
  84          * Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
  85          * 36-bit pointers in master configuration register
  86          */
  87         setbits32(&topregs->ctrl.mcr, MCFGR_WDENABLE |
  88                   (sizeof(dma_addr_t) == sizeof(u64) ? MCFGR_LONG_PTR : 0));
  89
  90         if (sizeof(dma_addr_t) == sizeof(u64))
  91                 dma_set_mask(dev, DMA_BIT_MASK(36));
  92
  93         /* Find out how many DECOs are present */
  94         deconum = (rd_reg64(&topregs->ctrl.perfmon.cha_num) &
  95                    CHA_NUM_DECONUM_MASK) >> CHA_NUM_DECONUM_SHIFT;
  96
  97         ctrlpriv->deco = kmalloc(deconum * sizeof(struct caam_deco *),
  98                                  GFP_KERNEL);
  99
 100         deco = (struct caam_deco __force **)&topregs->deco;
 101         for (d = 0; d < deconum; d++)
 102                 ctrlpriv->deco[d] = deco[d];
 103
 104         /*
 105          * Detect and enable JobRs
 106          * First, find out how many ring spec'ed, allocate references
 107          * for all, then go probe each one.
 108          */
 109         rspec = 0;
 110         for_each_compatible_node(np, NULL, "fsl,sec-v4.0-job-ring")
 111                 rspec++;
 112         ctrlpriv->jrdev = kzalloc(sizeof(struct device *) * rspec, GFP_KERNEL);
 113         if (ctrlpriv->jrdev == NULL) {
 114                 iounmap(&topregs->ctrl);
 115                 return -ENOMEM;
 116         }
 117
 118         ring = 0;
 119         ctrlpriv->total_jobrs = 0;
 120         for_each_compatible_node(np, NULL, "fsl,sec-v4.0-job-ring") {
 121                 caam_jr_probe(pdev, np, ring);
 122                 ctrlpriv->total_jobrs++;
 123                 ring++;
 124         }
 125
 126         /* Check to see if QI present. If so, enable */
 127         ctrlpriv->qi_present = !!(rd_reg64(&topregs->ctrl.perfmon.comp_parms) &
 128                                   CTPR_QI_MASK);
 129         if (ctrlpriv->qi_present) {
 130                 ctrlpriv->qi = (struct caam_queue_if __force *)&topregs->qi;
 131                 /* This is all that's required to physically enable QI */
 132                 wr_reg32(&topregs->qi.qi_control_lo, QICTL_DQEN);
 133         }
 134
 135         /* If no QI and no rings specified, quit and go home */
 136         if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) {
 137                 dev_err(dev, "no queues configured, terminating\n");
 138                 caam_remove(pdev);
 139                 return -ENOMEM;
 140         }
 141
 142         /* NOTE: RTIC detection ought to go here, around Si time */
 143
 144         /* Initialize queue allocator lock */
 145         spin_lock_init(&ctrlpriv->jr_alloc_lock);
 146
 147         /* Report "alive" for developer to see */
 148         dev_info(dev, "device ID = 0x%016llx\n",
 149                  rd_reg64(&topregs->ctrl.perfmon.caam_id));
 150         dev_info(dev, "job rings = %d, qi = %d\n",
 151                  ctrlpriv->total_jobrs, ctrlpriv->qi_present);
 152
 153 #ifdef CONFIG_DEBUG_FS
 154         /*
 155          * FIXME: needs better naming distinction, as some amalgamation of
 156          * "caam" and nprop->full_name. The OF name isn't distinctive,
 157          * but does separate instances
 158          */
 159         perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;
 160
 161         ctrlpriv->dfs_root = debugfs_create_dir("caam", NULL);
 162         ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);
 163
 164         /* Controller-level - performance monitor counters */
 165         ctrlpriv->ctl_rq_dequeued =
 166                 debugfs_create_u64("rq_dequeued",
 167                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 168                                    ctrlpriv->ctl, &perfmon->req_dequeued);
 169         ctrlpriv->ctl_ob_enc_req =
 170                 debugfs_create_u64("ob_rq_encrypted",
 171                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 172                                    ctrlpriv->ctl, &perfmon->ob_enc_req);
 173         ctrlpriv->ctl_ib_dec_req =
 174                 debugfs_create_u64("ib_rq_decrypted",
 175                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 176                                    ctrlpriv->ctl, &perfmon->ib_dec_req);
 177         ctrlpriv->ctl_ob_enc_bytes =
 178                 debugfs_create_u64("ob_bytes_encrypted",
 179                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 180                                    ctrlpriv->ctl, &perfmon->ob_enc_bytes);
 181         ctrlpriv->ctl_ob_prot_bytes =
 182                 debugfs_create_u64("ob_bytes_protected",
 183                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 184                                    ctrlpriv->ctl, &perfmon->ob_prot_bytes);
 185         ctrlpriv->ctl_ib_dec_bytes =
 186                 debugfs_create_u64("ib_bytes_decrypted",
 187                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 188                                    ctrlpriv->ctl, &perfmon->ib_dec_bytes);
 189         ctrlpriv->ctl_ib_valid_bytes =
 190                 debugfs_create_u64("ib_bytes_validated",
 191                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 192                                    ctrlpriv->ctl, &perfmon->ib_valid_bytes);
 193
 194         /* Controller level - global status values */
 195         ctrlpriv->ctl_faultaddr =
 196                 debugfs_create_u64("fault_addr",
 197                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 198                                    ctrlpriv->ctl, &perfmon->faultaddr);
 199         ctrlpriv->ctl_faultdetail =
 200                 debugfs_create_u32("fault_detail",
 201                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 202                                    ctrlpriv->ctl, &perfmon->faultdetail);
 203         ctrlpriv->ctl_faultstatus =
 204                 debugfs_create_u32("fault_status",
 205                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 206                                    ctrlpriv->ctl, &perfmon->status);
 207
 208         /* Internal covering keys (useful in non-secure mode only) */
 209         ctrlpriv->ctl_kek_wrap.data = &ctrlpriv->ctrl->kek[0];
 210         ctrlpriv->ctl_kek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 211         ctrlpriv->ctl_kek = debugfs_create_blob("kek",
 212                                                 S_IFCHR | S_IRUSR |
 213                                                 S_IRGRP | S_IROTH,
 214                                                 ctrlpriv->ctl,
 215                                                 &ctrlpriv->ctl_kek_wrap);
 216
 217         ctrlpriv->ctl_tkek_wrap.data = &ctrlpriv->ctrl->tkek[0];
 218         ctrlpriv->ctl_tkek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 219         ctrlpriv->ctl_tkek = debugfs_create_blob("tkek",
 220                                                  S_IFCHR | S_IRUSR |
 221                                                  S_IRGRP | S_IROTH,
 222                                                  ctrlpriv->ctl,
 223                                                  &ctrlpriv->ctl_tkek_wrap);
 224
 225         ctrlpriv->ctl_tdsk_wrap.data = &ctrlpriv->ctrl->tdsk[0];
 226         ctrlpriv->ctl_tdsk_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 227         ctrlpriv->ctl_tdsk = debugfs_create_blob("tdsk",
 228                                                  S_IFCHR | S_IRUSR |
 229                                                  S_IRGRP | S_IROTH,
 230                                                  ctrlpriv->ctl,
 231                                                  &ctrlpriv->ctl_tdsk_wrap);
 232 #endif
 233         return 0;
 234 }
 235
 236 static struct of_device_id caam_match[] = {
 237         {
 238                 .compatible = "fsl,sec-v4.0",
 239         },
 240         {},
 241 };
 242 MODULE_DEVICE_TABLE(of, caam_match);
 243
 244 static struct platform_driver caam_driver = {
 245         .driver = {
 246                 .name = "caam",
 247                 .owner = THIS_MODULE,
 248                 .of_match_table = caam_match,
 249         },
 250         .probe       = caam_probe,
 251         .remove      = __devexit_p(caam_remove),
 252 };
 253
 254 static int __init caam_base_init(void)
 255 {
 256         return platform_driver_register(&caam_driver);
 257 }
 258
 259 static void __exit caam_base_exit(void)
 260 {
 261         return platform_driver_unregister(&caam_driver);
 262 }
 263
 264 module_init(caam_base_init);
 265 module_exit(caam_base_exit);
 266
 267 MODULE_LICENSE("GPL");
 268 MODULE_DESCRIPTION("FSL CAAM request backend");
 269 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");