aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/lasat/picvue.c
blob: 9ae82c3ffb07d98f990808601e5a9517983e5777 (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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/*
 * Picvue PVC160206 display driver
 *
 * Brian Murphy <brian@murphy.dk>
 *
 */
#include <linux/kernel.h>
#include <linux/delay.h>
#include <asm/bootinfo.h>
#include <asm/lasat/lasat.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/string.h>

#include "picvue.h"

#define PVC_BUSY		0x80
#define PVC_NLINES		2
#define PVC_DISPMEM		80
#define PVC_LINELEN		PVC_DISPMEM / PVC_NLINES

struct pvc_defs *picvue = NULL;

DECLARE_MUTEX(pvc_sem);

static void pvc_reg_write(u32 val)
{
	*picvue->reg = val;
}

static u32 pvc_reg_read(void)
{
	u32 tmp = *picvue->reg;
	return tmp;
}

static void pvc_write_byte(u32 data, u8 byte)
{
	data |= picvue->e;
	pvc_reg_write(data);
	data &= ~picvue->data_mask;
	data |= byte << picvue->data_shift;
	pvc_reg_write(data);
	ndelay(220);
	pvc_reg_write(data & ~picvue->e);
	ndelay(220);
}

static u8 pvc_read_byte(u32 data)
{
	u8 byte;

	data |= picvue->e;
	pvc_reg_write(data);
	ndelay(220);
	byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift;
	data &= ~picvue->e;
	pvc_reg_write(data);
	ndelay(220);
	return byte;
}

static u8 pvc_read_data(void)
{
	u32 data = pvc_reg_read();
	u8 byte;
	data |= picvue->rw;
	data &= ~picvue->rs;
	pvc_reg_write(data);
	ndelay(40);
	byte = pvc_read_byte(data);
	data |= picvue->rs;
	pvc_reg_write(data);
	return byte;
}

#define TIMEOUT 1000
static int pvc_wait(void)
{
	int i = TIMEOUT;
	int err = 0;

	while ((pvc_read_data() & PVC_BUSY) && i)
		i--;
	if (i == 0)
		err = -ETIME;

	return err;
}

#define MODE_INST 0
#define MODE_DATA 1
static void pvc_write(u8 byte, int mode)
{
	u32 data = pvc_reg_read();
	data &= ~picvue->rw;
	if (mode == MODE_DATA)
		data |= picvue->rs;
	else
		data &= ~picvue->rs;
	pvc_reg_write(data);
	ndelay(40);
	pvc_write_byte(data, byte);
	if (mode == MODE_DATA)
		data &= ~picvue->rs;
	else
		data |= picvue->rs;
	pvc_reg_write(data);
	pvc_wait();
}

void pvc_write_string(const unsigned char *str, u8 addr, int line)
{
	int i = 0;

	if (line > 0 && (PVC_NLINES > 1))
		addr += 0x40 * line;
	pvc_write(0x80 | addr, MODE_INST);

	while (*str != 0 && i < PVC_LINELEN) {
		pvc_write(*str++, MODE_DATA);
		i++;
	}
}

void pvc_write_string_centered(const unsigned char *str, int line)
{
	int len = strlen(str);
	u8 addr;

	if (len > PVC_VISIBLE_CHARS)
		addr = 0;
	else
		addr = (PVC_VISIBLE_CHARS - strlen(str))/2;

	pvc_write_string(str, addr, line);
}

void pvc_dump_string(const unsigned char *str)
{
	int len = strlen(str);

	pvc_write_string(str, 0, 0);
	if (len > PVC_VISIBLE_CHARS)
		pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1);
}

#define BM_SIZE			8
#define MAX_PROGRAMMABLE_CHARS	8
int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE])
{
	int i;
	int addr;

	if (charnum > MAX_PROGRAMMABLE_CHARS)
		return -ENOENT;

	addr = charnum * 8;
	pvc_write(0x40 | addr, MODE_INST);

	for (i=0; i<BM_SIZE; i++)
		pvc_write(bitmap[i], MODE_DATA);
	return 0;
}

#define FUNC_SET_CMD	0x20
#define  EIGHT_BYTE	(1 << 4)
#define  FOUR_BYTE	0
#define  TWO_LINES	(1 << 3)
#define  ONE_LINE	0
#define  LARGE_FONT	(1 << 2)
#define  SMALL_FONT	0
static void pvc_funcset(u8 cmd)
{
	pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)), MODE_INST);
}

#define ENTRYMODE_CMD		0x4
#define  AUTO_INC		(1 << 1)
#define  AUTO_DEC		0
#define  CURSOR_FOLLOWS_DISP	(1 << 0)
static void pvc_entrymode(u8 cmd)
{
	pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)), MODE_INST);
}

#define DISP_CNT_CMD	0x08
#define  DISP_OFF	0
#define  DISP_ON	(1 << 2)
#define  CUR_ON		(1 << 1)
#define  CUR_BLINK	(1 << 0)
void pvc_dispcnt(u8 cmd)
{
	pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST);
}

#define MOVE_CMD	0x10
#define  DISPLAY	(1 << 3)
#define  CURSOR		0
#define  RIGHT		(1 << 2)
#define  LEFT		0
void pvc_move(u8 cmd)
{
	pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
}

#define CLEAR_CMD	0x1
void pvc_clear(void)
{
	pvc_write(CLEAR_CMD, MODE_INST);
}

#define HOME_CMD	0x2
void pvc_home(void)
{
	pvc_write(HOME_CMD, MODE_INST);
}

int pvc_init(void)
{
	u8 cmd = EIGHT_BYTE;

	if (PVC_NLINES == 2)
		cmd |= (SMALL_FONT|TWO_LINES);
	else
		cmd |= (LARGE_FONT|ONE_LINE);
	pvc_funcset(cmd);
	pvc_dispcnt(DISP_ON);
	pvc_entrymode(AUTO_INC);

	pvc_clear();
	pvc_write_string_centered("Display", 0);
	pvc_write_string_centered("Initialized", 1);

	return 0;
}

module_init(pvc_init);
MODULE_LICENSE("GPL");