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8#include <linux/kernel.h>
9#include <linux/delay.h>
10#include <asm/bootinfo.h>
11#include <asm/lasat/lasat.h>
12#include <linux/module.h>
13#include <linux/errno.h>
14#include <linux/string.h>
15
16#include "picvue.h"
17
18#define PVC_BUSY 0x80
19#define PVC_NLINES 2
20#define PVC_DISPMEM 80
21#define PVC_LINELEN PVC_DISPMEM / PVC_NLINES
22
23struct pvc_defs *picvue;
24
25static void pvc_reg_write(u32 val)
26{
27 *picvue->reg = val;
28}
29
30static u32 pvc_reg_read(void)
31{
32 u32 tmp = *picvue->reg;
33 return tmp;
34}
35
36static void pvc_write_byte(u32 data, u8 byte)
37{
38 data |= picvue->e;
39 pvc_reg_write(data);
40 data &= ~picvue->data_mask;
41 data |= byte << picvue->data_shift;
42 pvc_reg_write(data);
43 ndelay(220);
44 pvc_reg_write(data & ~picvue->e);
45 ndelay(220);
46}
47
48static u8 pvc_read_byte(u32 data)
49{
50 u8 byte;
51
52 data |= picvue->e;
53 pvc_reg_write(data);
54 ndelay(220);
55 byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift;
56 data &= ~picvue->e;
57 pvc_reg_write(data);
58 ndelay(220);
59 return byte;
60}
61
62static u8 pvc_read_data(void)
63{
64 u32 data = pvc_reg_read();
65 u8 byte;
66 data |= picvue->rw;
67 data &= ~picvue->rs;
68 pvc_reg_write(data);
69 ndelay(40);
70 byte = pvc_read_byte(data);
71 data |= picvue->rs;
72 pvc_reg_write(data);
73 return byte;
74}
75
76#define TIMEOUT 1000
77static int pvc_wait(void)
78{
79 int i = TIMEOUT;
80 int err = 0;
81
82 while ((pvc_read_data() & PVC_BUSY) && i)
83 i--;
84 if (i == 0)
85 err = -ETIME;
86
87 return err;
88}
89
90#define MODE_INST 0
91#define MODE_DATA 1
92static void pvc_write(u8 byte, int mode)
93{
94 u32 data = pvc_reg_read();
95 data &= ~picvue->rw;
96 if (mode == MODE_DATA)
97 data |= picvue->rs;
98 else
99 data &= ~picvue->rs;
100 pvc_reg_write(data);
101 ndelay(40);
102 pvc_write_byte(data, byte);
103 if (mode == MODE_DATA)
104 data &= ~picvue->rs;
105 else
106 data |= picvue->rs;
107 pvc_reg_write(data);
108 pvc_wait();
109}
110
111void pvc_write_string(const unsigned char *str, u8 addr, int line)
112{
113 int i = 0;
114
115 if (line > 0 && (PVC_NLINES > 1))
116 addr += 0x40 * line;
117 pvc_write(0x80 | addr, MODE_INST);
118
119 while (*str != 0 && i < PVC_LINELEN) {
120 pvc_write(*str++, MODE_DATA);
121 i++;
122 }
123}
124
125void pvc_write_string_centered(const unsigned char *str, int line)
126{
127 int len = strlen(str);
128 u8 addr;
129
130 if (len > PVC_VISIBLE_CHARS)
131 addr = 0;
132 else
133 addr = (PVC_VISIBLE_CHARS - strlen(str))/2;
134
135 pvc_write_string(str, addr, line);
136}
137
138void pvc_dump_string(const unsigned char *str)
139{
140 int len = strlen(str);
141
142 pvc_write_string(str, 0, 0);
143 if (len > PVC_VISIBLE_CHARS)
144 pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1);
145}
146
147#define BM_SIZE 8
148#define MAX_PROGRAMMABLE_CHARS 8
149int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE])
150{
151 int i;
152 int addr;
153
154 if (charnum > MAX_PROGRAMMABLE_CHARS)
155 return -ENOENT;
156
157 addr = charnum * 8;
158 pvc_write(0x40 | addr, MODE_INST);
159
160 for (i = 0; i < BM_SIZE; i++)
161 pvc_write(bitmap[i], MODE_DATA);
162 return 0;
163}
164
165#define FUNC_SET_CMD 0x20
166#define EIGHT_BYTE (1 << 4)
167#define FOUR_BYTE 0
168#define TWO_LINES (1 << 3)
169#define ONE_LINE 0
170#define LARGE_FONT (1 << 2)
171#define SMALL_FONT 0
172
173static void pvc_funcset(u8 cmd)
174{
175 pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)),
176 MODE_INST);
177}
178
179#define ENTRYMODE_CMD 0x4
180#define AUTO_INC (1 << 1)
181#define AUTO_DEC 0
182#define CURSOR_FOLLOWS_DISP (1 << 0)
183
184static void pvc_entrymode(u8 cmd)
185{
186 pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)),
187 MODE_INST);
188}
189
190#define DISP_CNT_CMD 0x08
191#define DISP_OFF 0
192#define DISP_ON (1 << 2)
193#define CUR_ON (1 << 1)
194#define CUR_BLINK (1 << 0)
195void pvc_dispcnt(u8 cmd)
196{
197 pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST);
198}
199
200#define MOVE_CMD 0x10
201#define DISPLAY (1 << 3)
202#define CURSOR 0
203#define RIGHT (1 << 2)
204#define LEFT 0
205void pvc_move(u8 cmd)
206{
207 pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
208}
209
210#define CLEAR_CMD 0x1
211void pvc_clear(void)
212{
213 pvc_write(CLEAR_CMD, MODE_INST);
214}
215
216#define HOME_CMD 0x2
217void pvc_home(void)
218{
219 pvc_write(HOME_CMD, MODE_INST);
220}
221
222int pvc_init(void)
223{
224 u8 cmd = EIGHT_BYTE;
225
226 if (PVC_NLINES == 2)
227 cmd |= (SMALL_FONT|TWO_LINES);
228 else
229 cmd |= (LARGE_FONT|ONE_LINE);
230 pvc_funcset(cmd);
231 pvc_dispcnt(DISP_ON);
232 pvc_entrymode(AUTO_INC);
233
234 pvc_clear();
235 pvc_write_string_centered("Display", 0);
236 pvc_write_string_centered("Initialized", 1);
237
238 return 0;
239}
240
241module_init(pvc_init);
242MODULE_LICENSE("GPL");
243
