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
40static u8 *tx_buf;
41
42static 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
58static 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)
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
130out:
131	kfree(buf);
132	return ret;
133}
134
135int 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)
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
155restore_fs:
156	kfree(tx_buf);
157	return ret;
158}
159