summaryrefslogtreecommitdiffstats
path: root/include/linux/mg_disk.h
blob: 1f76b1ebf627a957ed16278680a786bfe32f0229 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
/*
 *  include/linux/mg_disk.c
 *
 *  Support for the mGine m[g]flash IO mode.
 *  Based on legacy hd.c
 *
 * (c) 2008 mGine Co.,LTD
 * (c) 2008 unsik Kim <donari75@gmail.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#ifndef __MG_DISK_H__
#define __MG_DISK_H__

#include <linux/blkdev.h>
#include <linux/ata.h>

/* name for block device */
#define MG_DISK_NAME "mgd"
/* name for platform device */
#define MG_DEV_NAME "mg_disk"

#define MG_DISK_MAJ 0
#define MG_DISK_MAX_PART 16
#define MG_SECTOR_SIZE 512
#define MG_MAX_SECTS 256

/* Register offsets */
#define MG_BUFF_OFFSET			0x8000
#define MG_STORAGE_BUFFER_SIZE		0x200
#define MG_REG_OFFSET			0xC000
#define MG_REG_FEATURE			(MG_REG_OFFSET + 2)	/* write case */
#define MG_REG_ERROR			(MG_REG_OFFSET + 2)	/* read case */
#define MG_REG_SECT_CNT			(MG_REG_OFFSET + 4)
#define MG_REG_SECT_NUM			(MG_REG_OFFSET + 6)
#define MG_REG_CYL_LOW			(MG_REG_OFFSET + 8)
#define MG_REG_CYL_HIGH			(MG_REG_OFFSET + 0xA)
#define MG_REG_DRV_HEAD			(MG_REG_OFFSET + 0xC)
#define MG_REG_COMMAND			(MG_REG_OFFSET + 0xE)	/* write case */
#define MG_REG_STATUS			(MG_REG_OFFSET + 0xE)	/* read  case */
#define MG_REG_DRV_CTRL			(MG_REG_OFFSET + 0x10)
#define MG_REG_BURST_CTRL		(MG_REG_OFFSET + 0x12)

/* "Drive Select/Head Register" bit values */
#define MG_REG_HEAD_MUST_BE_ON		0xA0 /* These 2 bits are always on */
#define MG_REG_HEAD_DRIVE_MASTER	(0x00 | MG_REG_HEAD_MUST_BE_ON)
#define MG_REG_HEAD_DRIVE_SLAVE		(0x10 | MG_REG_HEAD_MUST_BE_ON)
#define MG_REG_HEAD_LBA_MODE		(0x40 | MG_REG_HEAD_MUST_BE_ON)


/* "Device Control Register" bit values */
#define MG_REG_CTRL_INTR_ENABLE			0x0
#define MG_REG_CTRL_INTR_DISABLE		(0x1<<1)
#define MG_REG_CTRL_RESET			(0x1<<2)
#define MG_REG_CTRL_INTR_POLA_ACTIVE_HIGH	0x0
#define MG_REG_CTRL_INTR_POLA_ACTIVE_LOW	(0x1<<4)
#define MG_REG_CTRL_DPD_POLA_ACTIVE_LOW		0x0
#define MG_REG_CTRL_DPD_POLA_ACTIVE_HIGH	(0x1<<5)
#define MG_REG_CTRL_DPD_DISABLE			0x0
#define MG_REG_CTRL_DPD_ENABLE			(0x1<<6)

/* Status register bit */
/* error bit in status register */
#define MG_REG_STATUS_BIT_ERROR			0x01
/* corrected error in status register */
#define MG_REG_STATUS_BIT_CORRECTED_ERROR	0x04
/* data request bit in status register */
#define MG_REG_STATUS_BIT_DATA_REQ		0x08
/* DSC - Drive Seek Complete */
#define MG_REG_STATUS_BIT_SEEK_DONE		0x10
/* DWF - Drive Write Fault */
#define MG_REG_STATUS_BIT_WRITE_FAULT		0x20
#define MG_REG_STATUS_BIT_READY			0x40
#define MG_REG_STATUS_BIT_BUSY			0x80

/* handy status */
#define MG_STAT_READY	(MG_REG_STATUS_BIT_READY | MG_REG_STATUS_BIT_SEEK_DONE)
#define MG_READY_OK(s)	(((s) & (MG_STAT_READY | \
				(MG_REG_STATUS_BIT_BUSY | \
				 MG_REG_STATUS_BIT_WRITE_FAULT | \
				 MG_REG_STATUS_BIT_ERROR))) == MG_STAT_READY)

/* Error register */
#define MG_REG_ERR_AMNF		0x01
#define MG_REG_ERR_ABRT		0x04
#define MG_REG_ERR_IDNF		0x10
#define MG_REG_ERR_UNC		0x40
#define MG_REG_ERR_BBK		0x80

/* error code for others */
#define MG_ERR_NONE		0
#define MG_ERR_TIMEOUT		0x100
#define MG_ERR_INIT_STAT	0x101
#define MG_ERR_TRANSLATION	0x102
#define MG_ERR_CTRL_RST		0x103
#define MG_ERR_INV_STAT		0x104
#define MG_ERR_RSTOUT		0x105

#define MG_MAX_ERRORS	6	/* Max read/write errors */

/* command */
#define MG_CMD_RD 0x20
#define MG_CMD_WR 0x30
#define MG_CMD_SLEEP 0x99
#define MG_CMD_WAKEUP 0xC3
#define MG_CMD_ID 0xEC
#define MG_CMD_WR_CONF 0x3C
#define MG_CMD_RD_CONF 0x40

/* operation mode */
#define MG_OP_CASCADE (1 << 0)
#define MG_OP_CASCADE_SYNC_RD (1 << 1)
#define MG_OP_CASCADE_SYNC_WR (1 << 2)
#define MG_OP_INTERLEAVE (1 << 3)

/* synchronous */
#define MG_BURST_LAT_4 (3 << 4)
#define MG_BURST_LAT_5 (4 << 4)
#define MG_BURST_LAT_6 (5 << 4)
#define MG_BURST_LAT_7 (6 << 4)
#define MG_BURST_LAT_8 (7 << 4)
#define MG_BURST_LEN_4 (1 << 1)
#define MG_BURST_LEN_8 (2 << 1)
#define MG_BURST_LEN_16 (3 << 1)
#define MG_BURST_LEN_32 (4 << 1)
#define MG_BURST_LEN_CONT (0 << 1)

/* timeout value (unit: ms) */
#define MG_TMAX_CONF_TO_CMD	1
#define MG_TMAX_WAIT_RD_DRQ	10
#define MG_TMAX_WAIT_WR_DRQ	500
#define MG_TMAX_RST_TO_BUSY	10
#define MG_TMAX_HDRST_TO_RDY	500
#define MG_TMAX_SWRST_TO_RDY	500
#define MG_TMAX_RSTOUT		3000

/* device attribution */
/* use mflash as boot device */
#define MG_BOOT_DEV		(1 << 0)
/* use mflash as storage device */
#define MG_STORAGE_DEV		(1 << 1)
/* same as MG_STORAGE_DEV, but bootloader already done reset sequence */
#define MG_STORAGE_DEV_SKIP_RST	(1 << 2)

#define MG_DEV_MASK (MG_BOOT_DEV | MG_STORAGE_DEV | MG_STORAGE_DEV_SKIP_RST)

/* names of GPIO resource */
#define MG_RST_PIN	"mg_rst"
/* except MG_BOOT_DEV, reset-out pin should be assigned */
#define MG_RSTOUT_PIN	"mg_rstout"

/* private driver data */
struct mg_drv_data {
	/* disk resource */
	u32 use_polling;

	/* device attribution */
	u32 dev_attr;

	/* internally used */
	struct mg_host *host;
};

/* main structure for mflash driver */
struct mg_host {
	struct device *dev;

	struct request_queue *breq;
	spinlock_t lock;
	struct gendisk *gd;

	struct timer_list timer;
	void (*mg_do_intr) (struct mg_host *);

	u16 id[ATA_ID_WORDS];

	u16 cyls;
	u16 heads;
	u16 sectors;
	u32 n_sectors;
	u32 nres_sectors;

	void __iomem *dev_base;
	unsigned int irq;
	unsigned int rst;
	unsigned int rstout;

	u32 major;
	u32 error;
};

/*
 * Debugging macro and defines
 */
#undef DO_MG_DEBUG
#ifdef DO_MG_DEBUG
#  define MG_DBG(fmt, args...) \
	printk(KERN_DEBUG "%s:%d "fmt, __func__, __LINE__, ##args)
#else /* CONFIG_MG_DEBUG */
#  define MG_DBG(fmt, args...) do { } while (0)
#endif /* CONFIG_MG_DEBUG */

#endif