xref: /openbmc/linux/drivers/crypto/caam/ctrl.c (revision b34081f1)
1 /*
2  * CAAM control-plane driver backend
3  * Controller-level driver, kernel property detection, initialization
4  *
5  * Copyright 2008-2012 Freescale Semiconductor, Inc.
6  */
7 
8 #include "compat.h"
9 #include "regs.h"
10 #include "intern.h"
11 #include "jr.h"
12 #include "desc_constr.h"
13 #include "error.h"
14 #include "ctrl.h"
15 
16 static int caam_remove(struct platform_device *pdev)
17 {
18 	struct device *ctrldev;
19 	struct caam_drv_private *ctrlpriv;
20 	struct caam_drv_private_jr *jrpriv;
21 	struct caam_full __iomem *topregs;
22 	int ring, ret = 0;
23 
24 	ctrldev = &pdev->dev;
25 	ctrlpriv = dev_get_drvdata(ctrldev);
26 	topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;
27 
28 	/* shut down JobRs */
29 	for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {
30 		ret |= caam_jr_shutdown(ctrlpriv->jrdev[ring]);
31 		jrpriv = dev_get_drvdata(ctrlpriv->jrdev[ring]);
32 		irq_dispose_mapping(jrpriv->irq);
33 	}
34 
35 	/* Shut down debug views */
36 #ifdef CONFIG_DEBUG_FS
37 	debugfs_remove_recursive(ctrlpriv->dfs_root);
38 #endif
39 
40 	/* Unmap controller region */
41 	iounmap(&topregs->ctrl);
42 
43 	kfree(ctrlpriv->jrdev);
44 	kfree(ctrlpriv);
45 
46 	return ret;
47 }
48 
49 /*
50  * Descriptor to instantiate RNG State Handle 0 in normal mode and
51  * load the JDKEK, TDKEK and TDSK registers
52  */
53 static void build_instantiation_desc(u32 *desc)
54 {
55 	u32 *jump_cmd;
56 
57 	init_job_desc(desc, 0);
58 
59 	/* INIT RNG in non-test mode */
60 	append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
61 			 OP_ALG_AS_INIT);
62 
63 	/* wait for done */
64 	jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
65 	set_jump_tgt_here(desc, jump_cmd);
66 
67 	/*
68 	 * load 1 to clear written reg:
69 	 * resets the done interrupt and returns the RNG to idle.
70 	 */
71 	append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);
72 
73 	/* generate secure keys (non-test) */
74 	append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
75 			 OP_ALG_RNG4_SK);
76 }
77 
78 static int instantiate_rng(struct device *ctrldev)
79 {
80 	struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
81 	struct caam_full __iomem *topregs;
82 	unsigned int timeout = 100000;
83 	u32 *desc;
84 	int i, ret = 0;
85 
86 	desc = kmalloc(CAAM_CMD_SZ * 6, GFP_KERNEL | GFP_DMA);
87 	if (!desc) {
88 		dev_err(ctrldev, "can't allocate RNG init descriptor memory\n");
89 		return -ENOMEM;
90 	}
91 	build_instantiation_desc(desc);
92 
93 	/* Set the bit to request direct access to DECO0 */
94 	topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;
95 	setbits32(&topregs->ctrl.deco_rq, DECORR_RQD0ENABLE);
96 
97 	while (!(rd_reg32(&topregs->ctrl.deco_rq) & DECORR_DEN0) &&
98 								 --timeout)
99 		cpu_relax();
100 
101 	if (!timeout) {
102 		dev_err(ctrldev, "failed to acquire DECO 0\n");
103 		ret = -EIO;
104 		goto out;
105 	}
106 
107 	for (i = 0; i < desc_len(desc); i++)
108 		topregs->deco.descbuf[i] = *(desc + i);
109 
110 	wr_reg32(&topregs->deco.jr_ctl_hi, DECO_JQCR_WHL | DECO_JQCR_FOUR);
111 
112 	timeout = 10000000;
113 	while ((rd_reg32(&topregs->deco.desc_dbg) & DECO_DBG_VALID) &&
114 								 --timeout)
115 		cpu_relax();
116 
117 	if (!timeout) {
118 		dev_err(ctrldev, "failed to instantiate RNG\n");
119 		ret = -EIO;
120 	}
121 
122 	clrbits32(&topregs->ctrl.deco_rq, DECORR_RQD0ENABLE);
123 out:
124 	kfree(desc);
125 	return ret;
126 }
127 
128 /*
129  * By default, the TRNG runs for 200 clocks per sample;
130  * 1600 clocks per sample generates better entropy.
131  */
132 static void kick_trng(struct platform_device *pdev)
133 {
134 	struct device *ctrldev = &pdev->dev;
135 	struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
136 	struct caam_full __iomem *topregs;
137 	struct rng4tst __iomem *r4tst;
138 	u32 val;
139 
140 	topregs = (struct caam_full __iomem *)ctrlpriv->ctrl;
141 	r4tst = &topregs->ctrl.r4tst[0];
142 
143 	/* put RNG4 into program mode */
144 	setbits32(&r4tst->rtmctl, RTMCTL_PRGM);
145 	/* 1600 clocks per sample */
146 	val = rd_reg32(&r4tst->rtsdctl);
147 	val = (val & ~RTSDCTL_ENT_DLY_MASK) | (1600 << RTSDCTL_ENT_DLY_SHIFT);
148 	wr_reg32(&r4tst->rtsdctl, val);
149 	/* min. freq. count */
150 	wr_reg32(&r4tst->rtfrqmin, 400);
151 	/* max. freq. count */
152 	wr_reg32(&r4tst->rtfrqmax, 6400);
153 	/* put RNG4 into run mode */
154 	clrbits32(&r4tst->rtmctl, RTMCTL_PRGM);
155 }
156 
157 /**
158  * caam_get_era() - Return the ERA of the SEC on SoC, based
159  * on the SEC_VID register.
160  * Returns the ERA number (1..4) or -ENOTSUPP if the ERA is unknown.
161  * @caam_id - the value of the SEC_VID register
162  **/
163 int caam_get_era(u64 caam_id)
164 {
165 	struct sec_vid *sec_vid = (struct sec_vid *)&caam_id;
166 	static const struct {
167 		u16 ip_id;
168 		u8 maj_rev;
169 		u8 era;
170 	} caam_eras[] = {
171 		{0x0A10, 1, 1},
172 		{0x0A10, 2, 2},
173 		{0x0A12, 1, 3},
174 		{0x0A14, 1, 3},
175 		{0x0A14, 2, 4},
176 		{0x0A16, 1, 4},
177 		{0x0A11, 1, 4}
178 	};
179 	int i;
180 
181 	for (i = 0; i < ARRAY_SIZE(caam_eras); i++)
182 		if (caam_eras[i].ip_id == sec_vid->ip_id &&
183 			caam_eras[i].maj_rev == sec_vid->maj_rev)
184 				return caam_eras[i].era;
185 
186 	return -ENOTSUPP;
187 }
188 EXPORT_SYMBOL(caam_get_era);
189 
190 /* Probe routine for CAAM top (controller) level */
191 static int caam_probe(struct platform_device *pdev)
192 {
193 	int ret, ring, rspec;
194 	u64 caam_id;
195 	struct device *dev;
196 	struct device_node *nprop, *np;
197 	struct caam_ctrl __iomem *ctrl;
198 	struct caam_full __iomem *topregs;
199 	struct caam_drv_private *ctrlpriv;
200 #ifdef CONFIG_DEBUG_FS
201 	struct caam_perfmon *perfmon;
202 #endif
203 	u64 cha_vid;
204 
205 	ctrlpriv = kzalloc(sizeof(struct caam_drv_private), GFP_KERNEL);
206 	if (!ctrlpriv)
207 		return -ENOMEM;
208 
209 	dev = &pdev->dev;
210 	dev_set_drvdata(dev, ctrlpriv);
211 	ctrlpriv->pdev = pdev;
212 	nprop = pdev->dev.of_node;
213 
214 	/* Get configuration properties from device tree */
215 	/* First, get register page */
216 	ctrl = of_iomap(nprop, 0);
217 	if (ctrl == NULL) {
218 		dev_err(dev, "caam: of_iomap() failed\n");
219 		return -ENOMEM;
220 	}
221 	ctrlpriv->ctrl = (struct caam_ctrl __force *)ctrl;
222 
223 	/* topregs used to derive pointers to CAAM sub-blocks only */
224 	topregs = (struct caam_full __iomem *)ctrl;
225 
226 	/* Get the IRQ of the controller (for security violations only) */
227 	ctrlpriv->secvio_irq = of_irq_to_resource(nprop, 0, NULL);
228 
229 	/*
230 	 * Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
231 	 * long pointers in master configuration register
232 	 */
233 	setbits32(&topregs->ctrl.mcr, MCFGR_WDENABLE |
234 		  (sizeof(dma_addr_t) == sizeof(u64) ? MCFGR_LONG_PTR : 0));
235 
236 	if (sizeof(dma_addr_t) == sizeof(u64))
237 		if (of_device_is_compatible(nprop, "fsl,sec-v5.0"))
238 			dma_set_mask(dev, DMA_BIT_MASK(40));
239 		else
240 			dma_set_mask(dev, DMA_BIT_MASK(36));
241 	else
242 		dma_set_mask(dev, DMA_BIT_MASK(32));
243 
244 	/*
245 	 * Detect and enable JobRs
246 	 * First, find out how many ring spec'ed, allocate references
247 	 * for all, then go probe each one.
248 	 */
249 	rspec = 0;
250 	for_each_compatible_node(np, NULL, "fsl,sec-v4.0-job-ring")
251 		rspec++;
252 	if (!rspec) {
253 		/* for backward compatible with device trees */
254 		for_each_compatible_node(np, NULL, "fsl,sec4.0-job-ring")
255 			rspec++;
256 	}
257 
258 	ctrlpriv->jrdev = kzalloc(sizeof(struct device *) * rspec, GFP_KERNEL);
259 	if (ctrlpriv->jrdev == NULL) {
260 		iounmap(&topregs->ctrl);
261 		return -ENOMEM;
262 	}
263 
264 	ring = 0;
265 	ctrlpriv->total_jobrs = 0;
266 	for_each_compatible_node(np, NULL, "fsl,sec-v4.0-job-ring") {
267 		caam_jr_probe(pdev, np, ring);
268 		ctrlpriv->total_jobrs++;
269 		ring++;
270 	}
271 	if (!ring) {
272 		for_each_compatible_node(np, NULL, "fsl,sec4.0-job-ring") {
273 			caam_jr_probe(pdev, np, ring);
274 			ctrlpriv->total_jobrs++;
275 			ring++;
276 		}
277 	}
278 
279 	/* Check to see if QI present. If so, enable */
280 	ctrlpriv->qi_present = !!(rd_reg64(&topregs->ctrl.perfmon.comp_parms) &
281 				  CTPR_QI_MASK);
282 	if (ctrlpriv->qi_present) {
283 		ctrlpriv->qi = (struct caam_queue_if __force *)&topregs->qi;
284 		/* This is all that's required to physically enable QI */
285 		wr_reg32(&topregs->qi.qi_control_lo, QICTL_DQEN);
286 	}
287 
288 	/* If no QI and no rings specified, quit and go home */
289 	if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) {
290 		dev_err(dev, "no queues configured, terminating\n");
291 		caam_remove(pdev);
292 		return -ENOMEM;
293 	}
294 
295 	cha_vid = rd_reg64(&topregs->ctrl.perfmon.cha_id);
296 
297 	/*
298 	 * If SEC has RNG version >= 4 and RNG state handle has not been
299 	 * already instantiated ,do RNG instantiation
300 	 */
301 	if ((cha_vid & CHA_ID_RNG_MASK) >> CHA_ID_RNG_SHIFT >= 4 &&
302 	    !(rd_reg32(&topregs->ctrl.r4tst[0].rdsta) & RDSTA_IF0)) {
303 		kick_trng(pdev);
304 		ret = instantiate_rng(dev);
305 		if (ret) {
306 			caam_remove(pdev);
307 			return ret;
308 		}
309 
310 		/* Enable RDB bit so that RNG works faster */
311 		setbits32(&topregs->ctrl.scfgr, SCFGR_RDBENABLE);
312 	}
313 
314 	/* NOTE: RTIC detection ought to go here, around Si time */
315 
316 	caam_id = rd_reg64(&topregs->ctrl.perfmon.caam_id);
317 
318 	/* Report "alive" for developer to see */
319 	dev_info(dev, "device ID = 0x%016llx (Era %d)\n", caam_id,
320 		 caam_get_era(caam_id));
321 	dev_info(dev, "job rings = %d, qi = %d\n",
322 		 ctrlpriv->total_jobrs, ctrlpriv->qi_present);
323 
324 #ifdef CONFIG_DEBUG_FS
325 	/*
326 	 * FIXME: needs better naming distinction, as some amalgamation of
327 	 * "caam" and nprop->full_name. The OF name isn't distinctive,
328 	 * but does separate instances
329 	 */
330 	perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;
331 
332 	ctrlpriv->dfs_root = debugfs_create_dir("caam", NULL);
333 	ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);
334 
335 	/* Controller-level - performance monitor counters */
336 	ctrlpriv->ctl_rq_dequeued =
337 		debugfs_create_u64("rq_dequeued",
338 				   S_IRUSR | S_IRGRP | S_IROTH,
339 				   ctrlpriv->ctl, &perfmon->req_dequeued);
340 	ctrlpriv->ctl_ob_enc_req =
341 		debugfs_create_u64("ob_rq_encrypted",
342 				   S_IRUSR | S_IRGRP | S_IROTH,
343 				   ctrlpriv->ctl, &perfmon->ob_enc_req);
344 	ctrlpriv->ctl_ib_dec_req =
345 		debugfs_create_u64("ib_rq_decrypted",
346 				   S_IRUSR | S_IRGRP | S_IROTH,
347 				   ctrlpriv->ctl, &perfmon->ib_dec_req);
348 	ctrlpriv->ctl_ob_enc_bytes =
349 		debugfs_create_u64("ob_bytes_encrypted",
350 				   S_IRUSR | S_IRGRP | S_IROTH,
351 				   ctrlpriv->ctl, &perfmon->ob_enc_bytes);
352 	ctrlpriv->ctl_ob_prot_bytes =
353 		debugfs_create_u64("ob_bytes_protected",
354 				   S_IRUSR | S_IRGRP | S_IROTH,
355 				   ctrlpriv->ctl, &perfmon->ob_prot_bytes);
356 	ctrlpriv->ctl_ib_dec_bytes =
357 		debugfs_create_u64("ib_bytes_decrypted",
358 				   S_IRUSR | S_IRGRP | S_IROTH,
359 				   ctrlpriv->ctl, &perfmon->ib_dec_bytes);
360 	ctrlpriv->ctl_ib_valid_bytes =
361 		debugfs_create_u64("ib_bytes_validated",
362 				   S_IRUSR | S_IRGRP | S_IROTH,
363 				   ctrlpriv->ctl, &perfmon->ib_valid_bytes);
364 
365 	/* Controller level - global status values */
366 	ctrlpriv->ctl_faultaddr =
367 		debugfs_create_u64("fault_addr",
368 				   S_IRUSR | S_IRGRP | S_IROTH,
369 				   ctrlpriv->ctl, &perfmon->faultaddr);
370 	ctrlpriv->ctl_faultdetail =
371 		debugfs_create_u32("fault_detail",
372 				   S_IRUSR | S_IRGRP | S_IROTH,
373 				   ctrlpriv->ctl, &perfmon->faultdetail);
374 	ctrlpriv->ctl_faultstatus =
375 		debugfs_create_u32("fault_status",
376 				   S_IRUSR | S_IRGRP | S_IROTH,
377 				   ctrlpriv->ctl, &perfmon->status);
378 
379 	/* Internal covering keys (useful in non-secure mode only) */
380 	ctrlpriv->ctl_kek_wrap.data = &ctrlpriv->ctrl->kek[0];
381 	ctrlpriv->ctl_kek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
382 	ctrlpriv->ctl_kek = debugfs_create_blob("kek",
383 						S_IRUSR |
384 						S_IRGRP | S_IROTH,
385 						ctrlpriv->ctl,
386 						&ctrlpriv->ctl_kek_wrap);
387 
388 	ctrlpriv->ctl_tkek_wrap.data = &ctrlpriv->ctrl->tkek[0];
389 	ctrlpriv->ctl_tkek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
390 	ctrlpriv->ctl_tkek = debugfs_create_blob("tkek",
391 						 S_IRUSR |
392 						 S_IRGRP | S_IROTH,
393 						 ctrlpriv->ctl,
394 						 &ctrlpriv->ctl_tkek_wrap);
395 
396 	ctrlpriv->ctl_tdsk_wrap.data = &ctrlpriv->ctrl->tdsk[0];
397 	ctrlpriv->ctl_tdsk_wrap.size = KEK_KEY_SIZE * sizeof(u32);
398 	ctrlpriv->ctl_tdsk = debugfs_create_blob("tdsk",
399 						 S_IRUSR |
400 						 S_IRGRP | S_IROTH,
401 						 ctrlpriv->ctl,
402 						 &ctrlpriv->ctl_tdsk_wrap);
403 #endif
404 	return 0;
405 }
406 
407 static struct of_device_id caam_match[] = {
408 	{
409 		.compatible = "fsl,sec-v4.0",
410 	},
411 	{
412 		.compatible = "fsl,sec4.0",
413 	},
414 	{},
415 };
416 MODULE_DEVICE_TABLE(of, caam_match);
417 
418 static struct platform_driver caam_driver = {
419 	.driver = {
420 		.name = "caam",
421 		.owner = THIS_MODULE,
422 		.of_match_table = caam_match,
423 	},
424 	.probe       = caam_probe,
425 	.remove      = caam_remove,
426 };
427 
428 module_platform_driver(caam_driver);
429 
430 MODULE_LICENSE("GPL");
431 MODULE_DESCRIPTION("FSL CAAM request backend");
432 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");
433