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