1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2012-2018 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 	/* Free "this" context */
23 	kfree(drvdata->sram_mgr_handle);
24 }
25 
26 /**
27  * cc_sram_mgr_init() - Initializes SRAM pool.
28  *      The pool starts right at the beginning of SRAM.
29  *      Returns zero for success, negative value otherwise.
30  *
31  * @drvdata: Associated device driver context
32  */
33 int cc_sram_mgr_init(struct cc_drvdata *drvdata)
34 {
35 	struct cc_sram_ctx *ctx;
36 	dma_addr_t start = 0;
37 	struct device *dev = drvdata_to_dev(drvdata);
38 
39 	if (drvdata->hw_rev < CC_HW_REV_712) {
40 		/* Pool starts after ROM bytes */
41 		start = (dma_addr_t)cc_ioread(drvdata,
42 					      CC_REG(HOST_SEP_SRAM_THRESHOLD));
43 
44 		if ((start & 0x3) != 0) {
45 			dev_err(dev, "Invalid SRAM offset %pad\n", &start);
46 			return -EINVAL;
47 		}
48 	}
49 
50 	/* Allocate "this" context */
51 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
52 
53 	if (!ctx)
54 		return -ENOMEM;
55 
56 	ctx->sram_free_offset = start;
57 	drvdata->sram_mgr_handle = ctx;
58 
59 	return 0;
60 }
61 
62 /*!
63  * Allocated buffer from SRAM pool.
64  * Note: Caller is responsible to free the LAST allocated buffer.
65  * This function does not taking care of any fragmentation may occur
66  * by the order of calls to alloc/free.
67  *
68  * \param drvdata
69  * \param size The requested bytes to allocate
70  */
71 cc_sram_addr_t cc_sram_alloc(struct cc_drvdata *drvdata, u32 size)
72 {
73 	struct cc_sram_ctx *smgr_ctx = drvdata->sram_mgr_handle;
74 	struct device *dev = drvdata_to_dev(drvdata);
75 	cc_sram_addr_t p;
76 
77 	if ((size & 0x3)) {
78 		dev_err(dev, "Requested buffer size (%u) is not multiple of 4",
79 			size);
80 		return NULL_SRAM_ADDR;
81 	}
82 	if (size > (CC_CC_SRAM_SIZE - smgr_ctx->sram_free_offset)) {
83 		dev_err(dev, "Not enough space to allocate %u B (at offset %llu)\n",
84 			size, smgr_ctx->sram_free_offset);
85 		return NULL_SRAM_ADDR;
86 	}
87 
88 	p = smgr_ctx->sram_free_offset;
89 	smgr_ctx->sram_free_offset += size;
90 	dev_dbg(dev, "Allocated %u B @ %u\n", size, (unsigned int)p);
91 	return p;
92 }
93 
94 /**
95  * cc_set_sram_desc() - Create const descriptors sequence to
96  *	set values in given array into SRAM.
97  * Note: each const value can't exceed word size.
98  *
99  * @src:	  A pointer to array of words to set as consts.
100  * @dst:	  The target SRAM buffer to set into
101  * @nelements:	  The number of words in "src" array
102  * @seq:	  A pointer to the given IN/OUT descriptor sequence
103  * @seq_len:	  A pointer to the given IN/OUT sequence length
104  */
105 void cc_set_sram_desc(const u32 *src, cc_sram_addr_t dst,
106 		      unsigned int nelement, struct cc_hw_desc *seq,
107 		      unsigned int *seq_len)
108 {
109 	u32 i;
110 	unsigned int idx = *seq_len;
111 
112 	for (i = 0; i < nelement; i++, idx++) {
113 		hw_desc_init(&seq[idx]);
114 		set_din_const(&seq[idx], src[i], sizeof(u32));
115 		set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
116 		set_flow_mode(&seq[idx], BYPASS);
117 	}
118 
119 	*seq_len = idx;
120 }
121