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 */
17int 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 */
44u32 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 */
77void 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