crypto: caam - fix build warning when DEBUG_FS not configured
[linux-2.6.git] / 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_IFCHR | 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_IFCHR | 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_IFCHR | 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_IFCHR | 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_IFCHR | 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_IFCHR | 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_IFCHR | 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_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
200                                    ctrlpriv->ctl, &perfmon->faultaddr);
201         ctrlpriv->ctl_faultdetail =
202                 debugfs_create_u32("fault_detail",
203                                    S_IFCHR | S_IRUSR | S_IRGRP | S_IROTH,
204                                    ctrlpriv->ctl, &perfmon->faultdetail);
205         ctrlpriv->ctl_faultstatus =
206                 debugfs_create_u32("fault_status",
207                                    S_IFCHR | 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_IFCHR | 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_IFCHR | 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_IFCHR | 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");