xref: /linux/drivers/crypto/ccree/cc_sram_mgr.c (revision ead5d1f4d877e92c051e1a1ade623d0d30e71619)
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
3 
4 #include "cc_driver.h"
5 #include "cc_sram_mgr.h"
6 
7 /**
8  * cc_sram_mgr_init() - Initializes SRAM pool.
9  *      The pool starts right at the beginning of SRAM.
10  *      Returns zero for success, negative value otherwise.
11  *
12  * @drvdata: Associated device driver context
13  *
14  * Return:
15  * 0 for success, negative error code for failure.
16  */
cc_sram_mgr_init(struct cc_drvdata * drvdata)17 int cc_sram_mgr_init(struct cc_drvdata *drvdata)
18 {
19 	u32 start = 0;
20 	struct device *dev = drvdata_to_dev(drvdata);
21 
22 	if (drvdata->hw_rev < CC_HW_REV_712) {
23 		/* Pool starts after ROM bytes */
24 		start = cc_ioread(drvdata, CC_REG(HOST_SEP_SRAM_THRESHOLD));
25 		if ((start & 0x3) != 0) {
26 			dev_err(dev, "Invalid SRAM offset 0x%x\n", start);
27 			return -EINVAL;
28 		}
29 	}
30 
31 	drvdata->sram_free_offset = start;
32 	return 0;
33 }
34 
35 /**
36  * cc_sram_alloc() - Allocate buffer from SRAM pool.
37  *
38  * @drvdata: Associated device driver context
39  * @size: The requested numer of bytes to allocate
40  *
41  * Return:
42  * Address offset in SRAM or NULL_SRAM_ADDR for failure.
43  */
cc_sram_alloc(struct cc_drvdata * drvdata,u32 size)44 u32 cc_sram_alloc(struct cc_drvdata *drvdata, u32 size)
45 {
46 	struct device *dev = drvdata_to_dev(drvdata);
47 	u32 p;
48 
49 	if ((size & 0x3)) {
50 		dev_err(dev, "Requested buffer size (%u) is not multiple of 4",
51 			size);
52 		return NULL_SRAM_ADDR;
53 	}
54 	if (size > (CC_CC_SRAM_SIZE - drvdata->sram_free_offset)) {
55 		dev_err(dev, "Not enough space to allocate %u B (at offset %u)\n",
56 			size, drvdata->sram_free_offset);
57 		return NULL_SRAM_ADDR;
58 	}
59 
60 	p = drvdata->sram_free_offset;
61 	drvdata->sram_free_offset += size;
62 	dev_dbg(dev, "Allocated %u B @ %u\n", size, p);
63 	return p;
64 }
65 
66 /**
67  * cc_set_sram_desc() - Create const descriptors sequence to
68  *	set values in given array into SRAM.
69  * Note: each const value can't exceed word size.
70  *
71  * @src:	  A pointer to array of words to set as consts.
72  * @dst:	  The target SRAM buffer to set into
73  * @nelement:	  The number of words in "src" array
74  * @seq:	  A pointer to the given IN/OUT descriptor sequence
75  * @seq_len:	  A pointer to the given IN/OUT sequence length
76  */
cc_set_sram_desc(const u32 * src,u32 dst,unsigned int nelement,struct cc_hw_desc * seq,unsigned int * seq_len)77 void cc_set_sram_desc(const u32 *src, u32 dst, unsigned int nelement,
78 		      struct cc_hw_desc *seq, unsigned int *seq_len)
79 {
80 	u32 i;
81 	unsigned int idx = *seq_len;
82 
83 	for (i = 0; i < nelement; i++, idx++) {
84 		hw_desc_init(&seq[idx]);
85 		set_din_const(&seq[idx], src[i], sizeof(u32));
86 		set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
87 		set_flow_mode(&seq[idx], BYPASS);
88 	}
89 
90 	*seq_len = idx;
91 }
92