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> | |
1f21d2bd BM |
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 | ||
1f21d2bd BM |
24 | static void pvc_reg_write(u32 val) |
25 | { | |
26 | *picvue->reg = val; | |
27 | } | |
28 | ||
29 | static u32 pvc_reg_read(void) | |
30 | { | |
31 | u32 tmp = *picvue->reg; | |
32 | return tmp; | |
33 | } | |
34 | ||
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 | ||
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 | ||
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 | |
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 | |
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 | ||
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 | ||
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 | ||
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 | |
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 | |
70342287 RB |
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 | |
1f21d2bd BM |
171 | |
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 | |
70342287 RB |
179 | #define AUTO_INC (1 << 1) |
180 | #define AUTO_DEC 0 | |
181 | #define CURSOR_FOLLOWS_DISP (1 << 0) | |
1f21d2bd BM |
182 | |
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 | |
70342287 RB |
190 | #define DISP_OFF 0 |
191 | #define DISP_ON (1 << 2) | |
192 | #define CUR_ON (1 << 1) | |
193 | #define CUR_BLINK (1 << 0) | |
1f21d2bd BM |
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 | |
70342287 RB |
200 | #define DISPLAY (1 << 3) |
201 | #define CURSOR 0 | |
202 | #define RIGHT (1 << 2) | |
203 | #define LEFT 0 | |
1f21d2bd BM |
204 | void pvc_move(u8 cmd) |
205 | { | |
206 | pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST); | |
207 | } | |
208 | ||
209 | #define CLEAR_CMD 0x1 | |
210 | void pvc_clear(void) | |
211 | { | |
212 | pvc_write(CLEAR_CMD, MODE_INST); | |
213 | } | |
214 | ||
215 | #define HOME_CMD 0x2 | |
216 | void pvc_home(void) | |
217 | { | |
218 | pvc_write(HOME_CMD, MODE_INST); | |
219 | } | |
220 | ||
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"); |