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  * struct cc_sram_ctx -Internal RAM context manager
9  * @sram_free_offset:   the offset to the non-allocated area
10  */
11 struct cc_sram_ctx {
12 	cc_sram_addr_t sram_free_offset;
13 };
14 
15 /**
16  * cc_sram_mgr_fini() - Cleanup SRAM pool.
17  *
18  * @drvdata: Associated device driver context
19  */
20 void cc_sram_mgr_fini(struct cc_drvdata *drvdata)
21 {
22 	/* Nothing needed */
23 }
24 
25 /**
26  * cc_sram_mgr_init() - Initializes SRAM pool.
27  *      The pool starts right at the beginning of SRAM.
28  *      Returns zero for success, negative value otherwise.
29  *
30  * @drvdata: Associated device driver context
31  */
32 int cc_sram_mgr_init(struct cc_drvdata *drvdata)
33 {
34 	struct cc_sram_ctx *ctx;
35 	dma_addr_t start = 0;
36 	struct device *dev = drvdata_to_dev(drvdata);
37 
38 	if (drvdata->hw_rev < CC_HW_REV_712) {
39 		/* Pool starts after ROM bytes */
40 		start = (dma_addr_t)cc_ioread(drvdata,
41 					      CC_REG(HOST_SEP_SRAM_THRESHOLD));
42 
43 		if ((start & 0x3) != 0) {
44 			dev_err(dev, "Invalid SRAM offset %pad\n", &start);
45 			return -EINVAL;
46 		}
47 	}
48 
49 	/* Allocate "this" context */
50 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
51 
52 	if (!ctx)
53 		return -ENOMEM;
54 
55 	ctx->sram_free_offset = start;
56 	drvdata->sram_mgr_handle = ctx;
57 
58 	return 0;
59 }
60 
61 /*!
62  * Allocated buffer from SRAM pool.
63  * Note: Caller is responsible to free the LAST allocated buffer.
64  * This function does not taking care of any fragmentation may occur
65  * by the order of calls to alloc/free.
66  *
67  * \param drvdata
68  * \param size The requested bytes to allocate
69  */
70 cc_sram_addr_t cc_sram_alloc(struct cc_drvdata *drvdata, u32 size)
71 {
72 	struct cc_sram_ctx *smgr_ctx = drvdata->sram_mgr_handle;
73 	struct device *dev = drvdata_to_dev(drvdata);
74 	cc_sram_addr_t p;
75 
76 	if ((size & 0x3)) {
77 		dev_err(dev, "Requested buffer size (%u) is not multiple of 4",
78 			size);
79 		return NULL_SRAM_ADDR;
80 	}
81 	if (size > (CC_CC_SRAM_SIZE - smgr_ctx->sram_free_offset)) {
82 		dev_err(dev, "Not enough space to allocate %u B (at offset %llu)\n",
83 			size, smgr_ctx->sram_free_offset);
84 		return NULL_SRAM_ADDR;
85 	}
86 
87 	p = smgr_ctx->sram_free_offset;
88 	smgr_ctx->sram_free_offset += size;
89 	dev_dbg(dev, "Allocated %u B @ %u\n", size, (unsigned int)p);
90 	return p;
91 }
92 
93 /**
94  * cc_set_sram_desc() - Create const descriptors sequence to
95  *	set values in given array into SRAM.
96  * Note: each const value can't exceed word size.
97  *
98  * @src:	  A pointer to array of words to set as consts.
99  * @dst:	  The target SRAM buffer to set into
100  * @nelements:	  The number of words in "src" array
101  * @seq:	  A pointer to the given IN/OUT descriptor sequence
102  * @seq_len:	  A pointer to the given IN/OUT sequence length
103  */
104 void cc_set_sram_desc(const u32 *src, cc_sram_addr_t dst,
105 		      unsigned int nelement, struct cc_hw_desc *seq,
106 		      unsigned int *seq_len)
107 {
108 	u32 i;
109 	unsigned int idx = *seq_len;
110 
111 	for (i = 0; i < nelement; i++, idx++) {
112 		hw_desc_init(&seq[idx]);
113 		set_din_const(&seq[idx], src[i], sizeof(u32));
114 		set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
115 		set_flow_mode(&seq[idx], BYPASS);
116 	}
117 
118 	*seq_len = idx;
119 }
120