1 /*
2 * Picvue PVC160206 display driver
3 *
4 * Brian Murphy <brian@murphy.dk>
5 *
6 */
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
22 struct pvc_defs *picvue;
23
pvc_reg_write(u32 val)24 static void pvc_reg_write(u32 val)
25 {
26 *picvue->reg = val;
27 }
28
pvc_reg_read(void)29 static u32 pvc_reg_read(void)
30 {
31 u32 tmp = *picvue->reg;
32 return tmp;
33 }
34
pvc_write_byte(u32 data,u8 byte)35 static 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
pvc_read_byte(u32 data)47 static 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
pvc_read_data(void)61 static 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
pvc_wait(void)76 static 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
pvc_write(u8 byte,int mode)91 static 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
pvc_write_string(const unsigned char * str,u8 addr,int line)110 void 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
pvc_write_string_centered(const unsigned char * str,int line)124 void 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
pvc_dump_string(const unsigned char * str)137 void 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
pvc_program_cg(int charnum,u8 bitmap[BM_SIZE])148 int 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
pvc_funcset(u8 cmd)172 static 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
pvc_entrymode(u8 cmd)183 static 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)
pvc_dispcnt(u8 cmd)194 void 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
pvc_move(u8 cmd)204 void pvc_move(u8 cmd)
205 {
206 pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
207 }
208
209 #define CLEAR_CMD 0x1
pvc_clear(void)210 void pvc_clear(void)
211 {
212 pvc_write(CLEAR_CMD, MODE_INST);
213 }
214
215 #define HOME_CMD 0x2
pvc_home(void)216 void pvc_home(void)
217 {
218 pvc_write(HOME_CMD, MODE_INST);
219 }
220
pvc_init(void)221 int 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
240 module_init(pvc_init);
241 MODULE_LICENSE("GPL");
242