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7#include <linux/kernel.h>
8#include <linux/delay.h>
9#include <asm/bootinfo.h>
10#include <asm/lasat/lasat.h>
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/string.h>
14
15#include "picvue.h"
16
17#define PVC_BUSY 0x80
18#define PVC_NLINES 2
19#define PVC_DISPMEM 80
20#define PVC_LINELEN PVC_DISPMEM / PVC_NLINES
21
22struct pvc_defs *picvue;
23
24static void pvc_reg_write(u32 val)
25{
26 *picvue->reg = val;
27}
28
29static u32 pvc_reg_read(void)
30{
31 u32 tmp = *picvue->reg;
32 return tmp;
33}
34
35static void pvc_write_byte(u32 data, u8 byte)
36{
37 data |= picvue->e;
38 pvc_reg_write(data);
39 data &= ~picvue->data_mask;
40 data |= byte << picvue->data_shift;
41 pvc_reg_write(data);
42 ndelay(220);
43 pvc_reg_write(data & ~picvue->e);
44 ndelay(220);
45}
46
47static u8 pvc_read_byte(u32 data)
48{
49 u8 byte;
50
51 data |= picvue->e;
52 pvc_reg_write(data);
53 ndelay(220);
54 byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift;
55 data &= ~picvue->e;
56 pvc_reg_write(data);
57 ndelay(220);
58 return byte;
59}
60
61static u8 pvc_read_data(void)
62{
63 u32 data = pvc_reg_read();
64 u8 byte;
65 data |= picvue->rw;
66 data &= ~picvue->rs;
67 pvc_reg_write(data);
68 ndelay(40);
69 byte = pvc_read_byte(data);
70 data |= picvue->rs;
71 pvc_reg_write(data);
72 return byte;
73}
74
75#define TIMEOUT 1000
76static int pvc_wait(void)
77{
78 int i = TIMEOUT;
79 int err = 0;
80
81 while ((pvc_read_data() & PVC_BUSY) && i)
82 i--;
83 if (i == 0)
84 err = -ETIME;
85
86 return err;
87}
88
89#define MODE_INST 0
90#define MODE_DATA 1
91static void pvc_write(u8 byte, int mode)
92{
93 u32 data = pvc_reg_read();
94 data &= ~picvue->rw;
95 if (mode == MODE_DATA)
96 data |= picvue->rs;
97 else
98 data &= ~picvue->rs;
99 pvc_reg_write(data);
100 ndelay(40);
101 pvc_write_byte(data, byte);
102 if (mode == MODE_DATA)
103 data &= ~picvue->rs;
104 else
105 data |= picvue->rs;
106 pvc_reg_write(data);
107 pvc_wait();
108}
109
110void pvc_write_string(const unsigned char *str, u8 addr, int line)
111{
112 int i = 0;
113
114 if (line > 0 && (PVC_NLINES > 1))
115 addr += 0x40 * line;
116 pvc_write(0x80 | addr, MODE_INST);
117
118 while (*str != 0 && i < PVC_LINELEN) {
119 pvc_write(*str++, MODE_DATA);
120 i++;
121 }
122}
123
124void pvc_write_string_centered(const unsigned char *str, int line)
125{
126 int len = strlen(str);
127 u8 addr;
128
129 if (len > PVC_VISIBLE_CHARS)
130 addr = 0;
131 else
132 addr = (PVC_VISIBLE_CHARS - strlen(str))/2;
133
134 pvc_write_string(str, addr, line);
135}
136
137void pvc_dump_string(const unsigned char *str)
138{
139 int len = strlen(str);
140
141 pvc_write_string(str, 0, 0);
142 if (len > PVC_VISIBLE_CHARS)
143 pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1);
144}
145
146#define BM_SIZE 8
147#define MAX_PROGRAMMABLE_CHARS 8
148int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE])
149{
150 int i;
151 int addr;
152
153 if (charnum > MAX_PROGRAMMABLE_CHARS)
154 return -ENOENT;
155
156 addr = charnum * 8;
157 pvc_write(0x40 | addr, MODE_INST);
158
159 for (i = 0; i < BM_SIZE; i++)
160 pvc_write(bitmap[i], MODE_DATA);
161 return 0;
162}
163
164#define FUNC_SET_CMD 0x20
165#define EIGHT_BYTE (1 << 4)
166#define FOUR_BYTE 0
167#define TWO_LINES (1 << 3)
168#define ONE_LINE 0
169#define LARGE_FONT (1 << 2)
170#define SMALL_FONT 0
171
172static void pvc_funcset(u8 cmd)
173{
174 pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)),
175 MODE_INST);
176}
177
178#define ENTRYMODE_CMD 0x4
179#define AUTO_INC (1 << 1)
180#define AUTO_DEC 0
181#define CURSOR_FOLLOWS_DISP (1 << 0)
182
183static void pvc_entrymode(u8 cmd)
184{
185 pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)),
186 MODE_INST);
187}
188
189#define DISP_CNT_CMD 0x08
190#define DISP_OFF 0
191#define DISP_ON (1 << 2)
192#define CUR_ON (1 << 1)
193#define CUR_BLINK (1 << 0)
194void pvc_dispcnt(u8 cmd)
195{
196 pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST);
197}
198
199#define MOVE_CMD 0x10
200#define DISPLAY (1 << 3)
201#define CURSOR 0
202#define RIGHT (1 << 2)
203#define LEFT 0
204void pvc_move(u8 cmd)
205{
206 pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
207}
208
209#define CLEAR_CMD 0x1
210void pvc_clear(void)
211{
212 pvc_write(CLEAR_CMD, MODE_INST);
213}
214
215#define HOME_CMD 0x2
216void pvc_home(void)
217{
218 pvc_write(HOME_CMD, MODE_INST);
219}
220
221int pvc_init(void)
222{
223 u8 cmd = EIGHT_BYTE;
224
225 if (PVC_NLINES == 2)
226 cmd |= (SMALL_FONT|TWO_LINES);
227 else
228 cmd |= (LARGE_FONT|ONE_LINE);
229 pvc_funcset(cmd);
230 pvc_dispcnt(DISP_ON);
231 pvc_entrymode(AUTO_INC);
232
233 pvc_clear();
234 pvc_write_string_centered("Display", 0);
235 pvc_write_string_centered("Initialized", 1);
236
237 return 0;
238}
239
240module_init(pvc_init);
241MODULE_LICENSE("GPL");
242
