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
pvc_reg_write(u32 val)25 static void pvc_reg_write(u32 val)
26 {
27 *picvue->reg = val;
28 }
29
pvc_reg_read(void)30 static u32 pvc_reg_read(void)
31 {
32 u32 tmp = *picvue->reg;
33 return tmp;
34 }
35
pvc_write_byte(u32 data,u8 byte)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
pvc_read_byte(u32 data)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
pvc_read_data(void)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
pvc_wait(void)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
pvc_write(u8 byte,int mode)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
pvc_write_string(const unsigned char * str,u8 addr,int line)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
pvc_write_string_centered(const unsigned char * str,int line)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
pvc_dump_string(const unsigned char * str)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
pvc_program_cg(int charnum,u8 bitmap[BM_SIZE])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
pvc_funcset(u8 cmd)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
pvc_entrymode(u8 cmd)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)
pvc_dispcnt(u8 cmd)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
pvc_move(u8 cmd)205 void pvc_move(u8 cmd)
206 {
207 pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
208 }
209
210 #define CLEAR_CMD 0x1
pvc_clear(void)211 void pvc_clear(void)
212 {
213 pvc_write(CLEAR_CMD, MODE_INST);
214 }
215
216 #define HOME_CMD 0x2
pvc_home(void)217 void pvc_home(void)
218 {
219 pvc_write(HOME_CMD, MODE_INST);
220 }
221
pvc_init(void)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");
243