1 // SPDX-License-Identifier: ISC
2 /*
3  * Copyright (c) 2015-2016 Qualcomm Atheros, Inc.
4  */
5 
6 /* This file has implementation for code swap logic. With code swap feature,
7  * target can run the fw binary with even smaller IRAM size by using host
8  * memory to store some of the code segments.
9  */
10 
11 #include "core.h"
12 #include "bmi.h"
13 #include "debug.h"
14 
15 static int ath10k_swap_code_seg_fill(struct ath10k *ar,
16 				     struct ath10k_swap_code_seg_info *seg_info,
17 				     const void *data, size_t data_len)
18 {
19 	u8 *virt_addr = seg_info->virt_address[0];
20 	u8 swap_magic[ATH10K_SWAP_CODE_SEG_MAGIC_BYTES_SZ] = {};
21 	const u8 *fw_data = data;
22 	union ath10k_swap_code_seg_item *swap_item;
23 	u32 length = 0;
24 	u32 payload_len;
25 	u32 total_payload_len = 0;
26 	u32 size_left = data_len;
27 
28 	/* Parse swap bin and copy the content to host allocated memory.
29 	 * The format is Address, length and value. The last 4-bytes is
30 	 * target write address. Currently address field is not used.
31 	 */
32 	seg_info->target_addr = -1;
33 	while (size_left >= sizeof(*swap_item)) {
34 		swap_item = (union ath10k_swap_code_seg_item *)fw_data;
35 		payload_len = __le32_to_cpu(swap_item->tlv.length);
36 		if ((payload_len > size_left) ||
37 		    (payload_len == 0 &&
38 		     size_left != sizeof(struct ath10k_swap_code_seg_tail))) {
39 			ath10k_err(ar, "refusing to parse invalid tlv length %d\n",
40 				   payload_len);
41 			return -EINVAL;
42 		}
43 
44 		if (payload_len == 0) {
45 			if (memcmp(swap_item->tail.magic_signature, swap_magic,
46 				   ATH10K_SWAP_CODE_SEG_MAGIC_BYTES_SZ)) {
47 				ath10k_err(ar, "refusing an invalid swap file\n");
48 				return -EINVAL;
49 			}
50 			seg_info->target_addr =
51 				__le32_to_cpu(swap_item->tail.bmi_write_addr);
52 			break;
53 		}
54 
55 		memcpy(virt_addr, swap_item->tlv.data, payload_len);
56 		virt_addr += payload_len;
57 		length = payload_len +  sizeof(struct ath10k_swap_code_seg_tlv);
58 		size_left -= length;
59 		fw_data += length;
60 		total_payload_len += payload_len;
61 	}
62 
63 	if (seg_info->target_addr == -1) {
64 		ath10k_err(ar, "failed to parse invalid swap file\n");
65 		return -EINVAL;
66 	}
67 	seg_info->seg_hw_info.swap_size = __cpu_to_le32(total_payload_len);
68 
69 	return 0;
70 }
71 
72 static void
73 ath10k_swap_code_seg_free(struct ath10k *ar,
74 			  struct ath10k_swap_code_seg_info *seg_info)
75 {
76 	u32 seg_size;
77 
78 	if (!seg_info)
79 		return;
80 
81 	if (!seg_info->virt_address[0])
82 		return;
83 
84 	seg_size = __le32_to_cpu(seg_info->seg_hw_info.size);
85 	dma_free_coherent(ar->dev, seg_size, seg_info->virt_address[0],
86 			  seg_info->paddr[0]);
87 }
88 
89 static struct ath10k_swap_code_seg_info *
90 ath10k_swap_code_seg_alloc(struct ath10k *ar, size_t swap_bin_len)
91 {
92 	struct ath10k_swap_code_seg_info *seg_info;
93 	void *virt_addr;
94 	dma_addr_t paddr;
95 
96 	swap_bin_len = roundup(swap_bin_len, 2);
97 	if (swap_bin_len > ATH10K_SWAP_CODE_SEG_BIN_LEN_MAX) {
98 		ath10k_err(ar, "refusing code swap bin because it is too big %zu > %d\n",
99 			   swap_bin_len, ATH10K_SWAP_CODE_SEG_BIN_LEN_MAX);
100 		return NULL;
101 	}
102 
103 	seg_info = devm_kzalloc(ar->dev, sizeof(*seg_info), GFP_KERNEL);
104 	if (!seg_info)
105 		return NULL;
106 
107 	virt_addr = dma_alloc_coherent(ar->dev, swap_bin_len, &paddr,
108 				       GFP_KERNEL);
109 	if (!virt_addr)
110 		return NULL;
111 
112 	seg_info->seg_hw_info.bus_addr[0] = __cpu_to_le32(paddr);
113 	seg_info->seg_hw_info.size = __cpu_to_le32(swap_bin_len);
114 	seg_info->seg_hw_info.swap_size = __cpu_to_le32(swap_bin_len);
115 	seg_info->seg_hw_info.num_segs =
116 			__cpu_to_le32(ATH10K_SWAP_CODE_SEG_NUM_SUPPORTED);
117 	seg_info->seg_hw_info.size_log2 = __cpu_to_le32(ilog2(swap_bin_len));
118 	seg_info->virt_address[0] = virt_addr;
119 	seg_info->paddr[0] = paddr;
120 
121 	return seg_info;
122 }
123 
124 int ath10k_swap_code_seg_configure(struct ath10k *ar,
125 				   const struct ath10k_fw_file *fw_file)
126 {
127 	int ret;
128 	struct ath10k_swap_code_seg_info *seg_info = NULL;
129 
130 	if (!fw_file->firmware_swap_code_seg_info)
131 		return 0;
132 
133 	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot found firmware code swap binary\n");
134 
135 	seg_info = fw_file->firmware_swap_code_seg_info;
136 
137 	ret = ath10k_bmi_write_memory(ar, seg_info->target_addr,
138 				      &seg_info->seg_hw_info,
139 				      sizeof(seg_info->seg_hw_info));
140 	if (ret) {
141 		ath10k_err(ar, "failed to write Code swap segment information (%d)\n",
142 			   ret);
143 		return ret;
144 	}
145 
146 	return 0;
147 }
148 
149 void ath10k_swap_code_seg_release(struct ath10k *ar,
150 				  struct ath10k_fw_file *fw_file)
151 {
152 	ath10k_swap_code_seg_free(ar, fw_file->firmware_swap_code_seg_info);
153 
154 	/* FIXME: these two assignments look to bein wrong place! Shouldn't
155 	 * they be in ath10k_core_free_firmware_files() like the rest?
156 	 */
157 	fw_file->codeswap_data = NULL;
158 	fw_file->codeswap_len = 0;
159 
160 	fw_file->firmware_swap_code_seg_info = NULL;
161 }
162 
163 int ath10k_swap_code_seg_init(struct ath10k *ar, struct ath10k_fw_file *fw_file)
164 {
165 	int ret;
166 	struct ath10k_swap_code_seg_info *seg_info;
167 	const void *codeswap_data;
168 	size_t codeswap_len;
169 
170 	codeswap_data = fw_file->codeswap_data;
171 	codeswap_len = fw_file->codeswap_len;
172 
173 	if (!codeswap_len || !codeswap_data)
174 		return 0;
175 
176 	seg_info = ath10k_swap_code_seg_alloc(ar, codeswap_len);
177 	if (!seg_info) {
178 		ath10k_err(ar, "failed to allocate fw code swap segment\n");
179 		return -ENOMEM;
180 	}
181 
182 	ret = ath10k_swap_code_seg_fill(ar, seg_info,
183 					codeswap_data, codeswap_len);
184 
185 	if (ret) {
186 		ath10k_warn(ar, "failed to initialize fw code swap segment: %d\n",
187 			    ret);
188 		ath10k_swap_code_seg_free(ar, seg_info);
189 		return ret;
190 	}
191 
192 	fw_file->firmware_swap_code_seg_info = seg_info;
193 
194 	return 0;
195 }
196