1 /*
2 * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
3 *
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/uaccess.h>
18 #include <linux/fs.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21
22 #include <linux/mmc/core.h>
23 #include <linux/mmc/card.h>
24 #include <linux/mmc/sdio_func.h>
25
26 #include <linux/firmware.h>
27
28 #include "gdm_sdio.h"
29 #include "sdio_boot.h"
30
31 #define TYPE_A_HEADER_SIZE 4
32 #define TYPE_A_LOOKAHEAD_SIZE 16
33 #define YMEM0_SIZE 0x8000 /* 32kbytes */
34 #define DOWNLOAD_SIZE (YMEM0_SIZE - TYPE_A_HEADER_SIZE)
35
36 #define FW_DIR "gdm72xx/"
37 #define FW_KRN "gdmskrn.bin"
38 #define FW_RFS "gdmsrfs.bin"
39
40 static u8 *tx_buf;
41
ack_ready(struct sdio_func * func)42 static int ack_ready(struct sdio_func *func)
43 {
44 unsigned long wait = jiffies + HZ;
45 u8 val;
46 int ret;
47
48 while (time_before(jiffies, wait)) {
49 val = sdio_readb(func, 0x13, &ret);
50 if (val & 0x01)
51 return 1;
52 schedule();
53 }
54
55 return 0;
56 }
57
download_image(struct sdio_func * func,const char * img_name)58 static int download_image(struct sdio_func *func, const char *img_name)
59 {
60 int ret = 0, len, pno;
61 u8 *buf = tx_buf;
62 loff_t pos = 0;
63 int img_len;
64 const struct firmware *firm;
65
66 ret = request_firmware(&firm, img_name, &func->dev);
67 if (ret < 0) {
68 dev_err(&func->dev,
69 "requesting firmware %s failed with error %d\n",
70 img_name, ret);
71 return ret;
72 }
73
74 buf = kmalloc(DOWNLOAD_SIZE + TYPE_A_HEADER_SIZE, GFP_KERNEL);
75 if (buf == NULL)
76 return -ENOMEM;
77
78 img_len = firm->size;
79
80 if (img_len <= 0) {
81 ret = -1;
82 goto out;
83 }
84
85 pno = 0;
86 while (img_len > 0) {
87 if (img_len > DOWNLOAD_SIZE) {
88 len = DOWNLOAD_SIZE;
89 buf[3] = 0;
90 } else {
91 len = img_len; /* the last packet */
92 buf[3] = 2;
93 }
94
95 buf[0] = len & 0xff;
96 buf[1] = (len >> 8) & 0xff;
97 buf[2] = (len >> 16) & 0xff;
98
99 memcpy(buf+TYPE_A_HEADER_SIZE, firm->data + pos, len);
100 ret = sdio_memcpy_toio(func, 0, buf, len + TYPE_A_HEADER_SIZE);
101 if (ret < 0) {
102 dev_err(&func->dev,
103 "send image error: packet number = %d ret = %d\n",
104 pno, ret);
105 goto out;
106 }
107
108 if (buf[3] == 2) /* The last packet */
109 break;
110 if (!ack_ready(func)) {
111 ret = -EIO;
112 dev_err(&func->dev, "Ack is not ready.\n");
113 goto out;
114 }
115 ret = sdio_memcpy_fromio(func, buf, 0, TYPE_A_LOOKAHEAD_SIZE);
116 if (ret < 0) {
117 dev_err(&func->dev,
118 "receive ack error: packet number = %d ret = %d\n",
119 pno, ret);
120 goto out;
121 }
122 sdio_writeb(func, 0x01, 0x13, &ret);
123 sdio_writeb(func, 0x00, 0x10, &ret); /* PCRRT */
124
125 img_len -= DOWNLOAD_SIZE;
126 pos += DOWNLOAD_SIZE;
127 pno++;
128 }
129
130 out:
131 kfree(buf);
132 return ret;
133 }
134
sdio_boot(struct sdio_func * func)135 int sdio_boot(struct sdio_func *func)
136 {
137 int ret;
138 const char *krn_name = FW_DIR FW_KRN;
139 const char *rfs_name = FW_DIR FW_RFS;
140
141 tx_buf = kmalloc(YMEM0_SIZE, GFP_KERNEL);
142 if (tx_buf == NULL)
143 return -ENOMEM;
144
145 ret = download_image(func, krn_name);
146 if (ret)
147 goto restore_fs;
148 dev_info(&func->dev, "GCT: Kernel download success.\n");
149
150 ret = download_image(func, rfs_name);
151 if (ret)
152 goto restore_fs;
153 dev_info(&func->dev, "GCT: Filesystem download success.\n");
154
155 restore_fs:
156 kfree(tx_buf);
157 return ret;
158 }
159