Commit | Line | Data |
---|---|---|
1f21d2bd BM |
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/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; | |
24 | ||
1f21d2bd BM |
25 | static void pvc_reg_write(u32 val) |
26 | { | |
27 | *picvue->reg = val; | |
28 | } | |
29 | ||
30 | static u32 pvc_reg_read(void) | |
31 | { | |
32 | u32 tmp = *picvue->reg; | |
33 | return tmp; | |
34 | } | |
35 | ||
36 | static 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 | ||
48 | static 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 | ||
62 | static 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 | |
77 | static 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 | |
92 | static 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 | ||
111 | void 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 | ||
125 | void 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 | ||
138 | void 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 | |
149 | int 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 | ||
173 | static 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 | ||
184 | static 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) | |
195 | void 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 | |
205 | void pvc_move(u8 cmd) | |
206 | { | |
207 | pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST); | |
208 | } | |
209 | ||
210 | #define CLEAR_CMD 0x1 | |
211 | void pvc_clear(void) | |
212 | { | |
213 | pvc_write(CLEAR_CMD, MODE_INST); | |
214 | } | |
215 | ||
216 | #define HOME_CMD 0x2 | |
217 | void pvc_home(void) | |
218 | { | |
219 | pvc_write(HOME_CMD, MODE_INST); | |
220 | } | |
221 | ||
222 | int 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 | ||
241 | module_init(pvc_init); | |
242 | MODULE_LICENSE("GPL"); |