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Commit | Line | Data |
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42a3b4f2 | 1 | /* |
1da177e4 LT |
2 | * Picvue PVC160206 display driver |
3 | * | |
42a3b4f2 | 4 | * Brian Murphy <brian@murphy.dk> |
1da177e4 LT |
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/init.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 | ||
23 | struct pvc_defs *picvue = NULL; | |
24 | ||
25 | DECLARE_MUTEX(pvc_sem); | |
26 | ||
42a3b4f2 | 27 | static void pvc_reg_write(u32 val) |
1da177e4 LT |
28 | { |
29 | *picvue->reg = val; | |
30 | } | |
31 | ||
42a3b4f2 | 32 | static u32 pvc_reg_read(void) |
1da177e4 LT |
33 | { |
34 | u32 tmp = *picvue->reg; | |
35 | return tmp; | |
36 | } | |
37 | ||
38 | static void pvc_write_byte(u32 data, u8 byte) | |
39 | { | |
40 | data |= picvue->e; | |
41 | pvc_reg_write(data); | |
42 | data &= ~picvue->data_mask; | |
43 | data |= byte << picvue->data_shift; | |
44 | pvc_reg_write(data); | |
45 | ndelay(220); | |
46 | pvc_reg_write(data & ~picvue->e); | |
47 | ndelay(220); | |
48 | } | |
49 | ||
50 | static u8 pvc_read_byte(u32 data) | |
51 | { | |
52 | u8 byte; | |
53 | ||
54 | data |= picvue->e; | |
55 | pvc_reg_write(data); | |
56 | ndelay(220); | |
57 | byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift; | |
58 | data &= ~picvue->e; | |
59 | pvc_reg_write(data); | |
60 | ndelay(220); | |
61 | return byte; | |
62 | } | |
63 | ||
64 | static u8 pvc_read_data(void) | |
65 | { | |
66 | u32 data = pvc_reg_read(); | |
67 | u8 byte; | |
42a3b4f2 | 68 | data |= picvue->rw; |
1da177e4 LT |
69 | data &= ~picvue->rs; |
70 | pvc_reg_write(data); | |
71 | ndelay(40); | |
72 | byte = pvc_read_byte(data); | |
42a3b4f2 | 73 | data |= picvue->rs; |
1da177e4 LT |
74 | pvc_reg_write(data); |
75 | return byte; | |
76 | } | |
77 | ||
78 | #define TIMEOUT 1000 | |
79 | static int pvc_wait(void) | |
80 | { | |
81 | int i = TIMEOUT; | |
82 | int err = 0; | |
83 | ||
84 | while ((pvc_read_data() & PVC_BUSY) && i) | |
85 | i--; | |
86 | if (i == 0) | |
87 | err = -ETIME; | |
88 | ||
89 | return err; | |
90 | } | |
91 | ||
92 | #define MODE_INST 0 | |
93 | #define MODE_DATA 1 | |
94 | static void pvc_write(u8 byte, int mode) | |
95 | { | |
96 | u32 data = pvc_reg_read(); | |
97 | data &= ~picvue->rw; | |
98 | if (mode == MODE_DATA) | |
99 | data |= picvue->rs; | |
100 | else | |
101 | data &= ~picvue->rs; | |
102 | pvc_reg_write(data); | |
103 | ndelay(40); | |
104 | pvc_write_byte(data, byte); | |
105 | if (mode == MODE_DATA) | |
106 | data &= ~picvue->rs; | |
107 | else | |
108 | data |= picvue->rs; | |
109 | pvc_reg_write(data); | |
110 | pvc_wait(); | |
111 | } | |
112 | ||
113 | void pvc_write_string(const unsigned char *str, u8 addr, int line) | |
114 | { | |
115 | int i = 0; | |
116 | ||
117 | if (line > 0 && (PVC_NLINES > 1)) | |
118 | addr += 0x40 * line; | |
119 | pvc_write(0x80 | addr, MODE_INST); | |
120 | ||
121 | while (*str != 0 && i < PVC_LINELEN) { | |
122 | pvc_write(*str++, MODE_DATA); | |
123 | i++; | |
124 | } | |
125 | } | |
126 | ||
127 | void pvc_write_string_centered(const unsigned char *str, int line) | |
128 | { | |
129 | int len = strlen(str); | |
130 | u8 addr; | |
131 | ||
132 | if (len > PVC_VISIBLE_CHARS) | |
133 | addr = 0; | |
134 | else | |
135 | addr = (PVC_VISIBLE_CHARS - strlen(str))/2; | |
136 | ||
137 | pvc_write_string(str, addr, line); | |
138 | } | |
139 | ||
140 | void pvc_dump_string(const unsigned char *str) | |
141 | { | |
142 | int len = strlen(str); | |
143 | ||
144 | pvc_write_string(str, 0, 0); | |
145 | if (len > PVC_VISIBLE_CHARS) | |
146 | pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1); | |
147 | } | |
148 | ||
149 | #define BM_SIZE 8 | |
150 | #define MAX_PROGRAMMABLE_CHARS 8 | |
151 | int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE]) | |
152 | { | |
153 | int i; | |
154 | int addr; | |
155 | ||
156 | if (charnum > MAX_PROGRAMMABLE_CHARS) | |
157 | return -ENOENT; | |
158 | ||
159 | addr = charnum * 8; | |
160 | pvc_write(0x40 | addr, MODE_INST); | |
161 | ||
162 | for (i=0; i<BM_SIZE; i++) | |
163 | pvc_write(bitmap[i], MODE_DATA); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | #define FUNC_SET_CMD 0x20 | |
168 | #define EIGHT_BYTE (1 << 4) | |
169 | #define FOUR_BYTE 0 | |
170 | #define TWO_LINES (1 << 3) | |
171 | #define ONE_LINE 0 | |
172 | #define LARGE_FONT (1 << 2) | |
173 | #define SMALL_FONT 0 | |
174 | static void pvc_funcset(u8 cmd) | |
175 | { | |
176 | pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)), 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 | static void pvc_entrymode(u8 cmd) | |
184 | { | |
185 | pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)), MODE_INST); | |
186 | } | |
187 | ||
188 | #define DISP_CNT_CMD 0x08 | |
189 | #define DISP_OFF 0 | |
190 | #define DISP_ON (1 << 2) | |
191 | #define CUR_ON (1 << 1) | |
192 | #define CUR_BLINK (1 << 0) | |
193 | void pvc_dispcnt(u8 cmd) | |
194 | { | |
195 | pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST); | |
196 | } | |
197 | ||
198 | #define MOVE_CMD 0x10 | |
199 | #define DISPLAY (1 << 3) | |
200 | #define CURSOR 0 | |
201 | #define RIGHT (1 << 2) | |
202 | #define LEFT 0 | |
203 | void pvc_move(u8 cmd) | |
204 | { | |
205 | pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST); | |
206 | } | |
207 | ||
208 | #define CLEAR_CMD 0x1 | |
209 | void pvc_clear(void) | |
210 | { | |
211 | pvc_write(CLEAR_CMD, MODE_INST); | |
212 | } | |
213 | ||
214 | #define HOME_CMD 0x2 | |
215 | void pvc_home(void) | |
216 | { | |
217 | pvc_write(HOME_CMD, MODE_INST); | |
218 | } | |
219 | ||
220 | int pvc_init(void) | |
221 | { | |
222 | u8 cmd = EIGHT_BYTE; | |
223 | ||
224 | if (PVC_NLINES == 2) | |
225 | cmd |= (SMALL_FONT|TWO_LINES); | |
226 | else | |
227 | cmd |= (LARGE_FONT|ONE_LINE); | |
228 | pvc_funcset(cmd); | |
229 | pvc_dispcnt(DISP_ON); | |
230 | pvc_entrymode(AUTO_INC); | |
231 | ||
232 | pvc_clear(); | |
233 | pvc_write_string_centered("Display", 0); | |
234 | pvc_write_string_centered("Initialized", 1); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | module_init(pvc_init); | |
240 | MODULE_LICENSE("GPL"); |