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                       const struct of_device_id *devmatch)
  49 {
  50         int d, ring, rspec;
  51         struct device *dev;
  52         struct device_node *nprop, *np;
  53         struct caam_ctrl __iomem *ctrl;
  54         struct caam_full __iomem *topregs;
  55         struct caam_drv_private *ctrlpriv;
  56         struct caam_perfmon *perfmon;
  57         struct caam_deco **deco;
  58         u32 deconum;
  59
  60         ctrlpriv = kzalloc(sizeof(struct caam_drv_private), GFP_KERNEL);
  61         if (!ctrlpriv)
  62                 return -ENOMEM;
  63
  64         dev = &pdev->dev;
  65         dev_set_drvdata(dev, ctrlpriv);
  66         ctrlpriv->pdev = pdev;
  67         nprop = pdev->dev.of_node;
  68
  69         /* Get configuration properties from device tree */
  70         /* First, get register page */
  71         ctrl = of_iomap(nprop, 0);
  72         if (ctrl == NULL) {
  73                 dev_err(dev, "caam: of_iomap() failed\n");
  74                 return -ENOMEM;
  75         }
  76         ctrlpriv->ctrl = (struct caam_ctrl __force *)ctrl;
  77
  78         /* topregs used to derive pointers to CAAM sub-blocks only */
  79         topregs = (struct caam_full __iomem *)ctrl;
  80
  81         /* Get the IRQ of the controller (for security violations only) */
  82         ctrlpriv->secvio_irq = of_irq_to_resource(nprop, 0, NULL);
  83
  84         /*
  85          * Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
  86          * 36-bit pointers in master configuration register
  87          */
  88         setbits32(&topregs->ctrl.mcr, MCFGR_WDENABLE |
  89                   (sizeof(dma_addr_t) == sizeof(u64) ? MCFGR_LONG_PTR : 0));
  90
  91         if (sizeof(dma_addr_t) == sizeof(u64))
  92                 dma_set_mask(dev, DMA_BIT_MASK(36));
  93
  94         /* Find out how many DECOs are present */
  95         deconum = (rd_reg64(&topregs->ctrl.perfmon.cha_num) &
  96                    CHA_NUM_DECONUM_MASK) >> CHA_NUM_DECONUM_SHIFT;
  97
  98         ctrlpriv->deco = kmalloc(deconum * sizeof(struct caam_deco *),
  99                                  GFP_KERNEL);
 100
 101         deco = (struct caam_deco __force **)&topregs->deco;
 102         for (d = 0; d < deconum; d++)
 103                 ctrlpriv->deco[d] = deco[d];
 104
 105         /*
 106          * Detect and enable JobRs
 107          * First, find out how many ring spec'ed, allocate references
 108          * for all, then go probe each one.
 109          */
 110         rspec = 0;
 111         for_each_compatible_node(np, NULL, "fsl,sec4.0-job-ring")
 112                 rspec++;
 113         ctrlpriv->jrdev = kzalloc(sizeof(struct device *) * rspec, GFP_KERNEL);
 114         if (ctrlpriv->jrdev == NULL) {
 115                 iounmap(&topregs->ctrl);
 116                 return -ENOMEM;
 117         }
 118
 119         ring = 0;
 120         ctrlpriv->total_jobrs = 0;
 121         for_each_compatible_node(np, NULL, "fsl,sec4.0-job-ring") {
 122                 caam_jr_probe(pdev, np, ring);
 123                 ctrlpriv->total_jobrs++;
 124                 ring++;
 125         }
 126
 127         /* Check to see if QI present. If so, enable */
 128         ctrlpriv->qi_present = !!(rd_reg64(&topregs->ctrl.perfmon.comp_parms) &
 129                                   CTPR_QI_MASK);
 130         if (ctrlpriv->qi_present) {
 131                 ctrlpriv->qi = (struct caam_queue_if __force *)&topregs->qi;
 132                 /* This is all that's required to physically enable QI */
 133                 wr_reg32(&topregs->qi.qi_control_lo, QICTL_DQEN);
 134         }
 135
 136         /* If no QI and no rings specified, quit and go home */
 137         if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) {
 138                 dev_err(dev, "no queues configured, terminating\n");
 139                 caam_remove(pdev);
 140                 return -ENOMEM;
 141         }
 142
 143         /* NOTE: RTIC detection ought to go here, around Si time */
 144
 145         /* Initialize queue allocator lock */
 146         spin_lock_init(&ctrlpriv->jr_alloc_lock);
 147
 148         /* Report "alive" for developer to see */
 149         dev_info(dev, "device ID = 0x%016llx\n",
 150                  rd_reg64(&topregs->ctrl.perfmon.caam_id));
 151         dev_info(dev, "job rings = %d, qi = %d\n",
 152                  ctrlpriv->total_jobrs, ctrlpriv->qi_present);
 153
 154 #ifdef CONFIG_DEBUG_FS
 155         /*
 156          * FIXME: needs better naming distinction, as some amalgamation of
 157          * "caam" and nprop->full_name. The OF name isn't distinctive,
 158          * but does separate instances
 159          */
 160         perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;
 161
 162         ctrlpriv->dfs_root = debugfs_create_dir("caam", NULL);
 163         ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);
 164
 165         /* Controller-level - performance monitor counters */
 166         ctrlpriv->ctl_rq_dequeued =
 167                 debugfs_create_u64("rq_dequeued",
 168                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 169                                    ctrlpriv->ctl, &perfmon->req_dequeued);
 170         ctrlpriv->ctl_ob_enc_req =
 171                 debugfs_create_u64("ob_rq_encrypted",
 172                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 173                                    ctrlpriv->ctl, &perfmon->ob_enc_req);
 174         ctrlpriv->ctl_ib_dec_req =
 175                 debugfs_create_u64("ib_rq_decrypted",
 176                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 177                                    ctrlpriv->ctl, &perfmon->ib_dec_req);
 178         ctrlpriv->ctl_ob_enc_bytes =
 179                 debugfs_create_u64("ob_bytes_encrypted",
 180                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 181                                    ctrlpriv->ctl, &perfmon->ob_enc_bytes);
 182         ctrlpriv->ctl_ob_prot_bytes =
 183                 debugfs_create_u64("ob_bytes_protected",
 184                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 185                                    ctrlpriv->ctl, &perfmon->ob_prot_bytes);
 186         ctrlpriv->ctl_ib_dec_bytes =
 187                 debugfs_create_u64("ib_bytes_decrypted",
 188                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 189                                    ctrlpriv->ctl, &perfmon->ib_dec_bytes);
 190         ctrlpriv->ctl_ib_valid_bytes =
 191                 debugfs_create_u64("ib_bytes_validated",
 192                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 193                                    ctrlpriv->ctl, &perfmon->ib_valid_bytes);
 194
 195         /* Controller level - global status values */
 196         ctrlpriv->ctl_faultaddr =
 197                 debugfs_create_u64("fault_addr",
 198                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 199                                    ctrlpriv->ctl, &perfmon->faultaddr);
 200         ctrlpriv->ctl_faultdetail =
 201                 debugfs_create_u32("fault_detail",
 202                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 203                                    ctrlpriv->ctl, &perfmon->faultdetail);
 204         ctrlpriv->ctl_faultstatus =
 205                 debugfs_create_u32("fault_status",
 206                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
 207                                    ctrlpriv->ctl, &perfmon->status);
 208
 209         /* Internal covering keys (useful in non-secure mode only) */
 210         ctrlpriv->ctl_kek_wrap.data = &ctrlpriv->ctrl->kek[0];
 211         ctrlpriv->ctl_kek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 212         ctrlpriv->ctl_kek = debugfs_create_blob("kek",
 213                                                 S_IFCHR | S_IRUSR |
 214                                                 S_IRGRP | S_IROTH,
 215                                                 ctrlpriv->ctl,
 216                                                 &ctrlpriv->ctl_kek_wrap);
 217
 218         ctrlpriv->ctl_tkek_wrap.data = &ctrlpriv->ctrl->tkek[0];
 219         ctrlpriv->ctl_tkek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 220         ctrlpriv->ctl_tkek = debugfs_create_blob("tkek",
 221                                                  S_IFCHR | S_IRUSR |
 222                                                  S_IRGRP | S_IROTH,
 223                                                  ctrlpriv->ctl,
 224                                                  &ctrlpriv->ctl_tkek_wrap);
 225
 226         ctrlpriv->ctl_tdsk_wrap.data = &ctrlpriv->ctrl->tdsk[0];
 227         ctrlpriv->ctl_tdsk_wrap.size = KEK_KEY_SIZE * sizeof(u32);
 228         ctrlpriv->ctl_tdsk = debugfs_create_blob("tdsk",
 229                                                  S_IFCHR | S_IRUSR |
 230                                                  S_IRGRP | S_IROTH,
 231                                                  ctrlpriv->ctl,
 232                                                  &ctrlpriv->ctl_tdsk_wrap);
 233 #endif
 234         return 0;
 235 }
 236
 237 static struct of_device_id caam_match[] = {
 238         {
 239                 .compatible = "fsl,sec4.0",
 240         },
 241         {},
 242 };
 243 MODULE_DEVICE_TABLE(of, caam_match);
 244
 245 static struct of_platform_driver caam_driver = {
 246         .driver = {
 247                 .name = "caam",
 248                 .owner = THIS_MODULE,
 249                 .of_match_table = caam_match,
 250         },
 251         .probe       = caam_probe,
 252         .remove      = __devexit_p(caam_remove),
 253 };
 254
 255 static int __init caam_base_init(void)
 256 {
 257         return of_register_platform_driver(&caam_driver);
 258 }
 259
 260 static void __exit caam_base_exit(void)
 261 {
 262         return of_unregister_platform_driver(&caam_driver);
 263 }
 264
 265 module_init(caam_base_init);
 266 module_exit(caam_base_exit);
 267
 268 MODULE_LICENSE("GPL");
 269 MODULE_DESCRIPTION("FSL CAAM request backend");
 270 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");