2 * Picvue PVC160206 display driver
4 * Brian Murphy <brian@murphy.dk>
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>
20 #define PVC_DISPMEM 80
21 #define PVC_LINELEN PVC_DISPMEM / PVC_NLINES
23 struct pvc_defs *picvue;
25 static void pvc_reg_write(u32 val)
30 static u32 pvc_reg_read(void)
32 u32 tmp = *picvue->reg;
36 static void pvc_write_byte(u32 data, u8 byte)
40 data &= ~picvue->data_mask;
41 data |= byte << picvue->data_shift;
44 pvc_reg_write(data & ~picvue->e);
48 static u8 pvc_read_byte(u32 data)
55 byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift;
62 static u8 pvc_read_data(void)
64 u32 data = pvc_reg_read();
70 byte = pvc_read_byte(data);
77 static int pvc_wait(void)
82 while ((pvc_read_data() & PVC_BUSY) && i)
92 static void pvc_write(u8 byte, int mode)
94 u32 data = pvc_reg_read();
96 if (mode == MODE_DATA)
102 pvc_write_byte(data, byte);
103 if (mode == MODE_DATA)
111 void pvc_write_string(const unsigned char *str, u8 addr, int line)
115 if (line > 0 && (PVC_NLINES > 1))
117 pvc_write(0x80 | addr, MODE_INST);
119 while (*str != 0 && i < PVC_LINELEN) {
120 pvc_write(*str++, MODE_DATA);
125 void pvc_write_string_centered(const unsigned char *str, int line)
127 int len = strlen(str);
130 if (len > PVC_VISIBLE_CHARS)
133 addr = (PVC_VISIBLE_CHARS - strlen(str))/2;
135 pvc_write_string(str, addr, line);
138 void pvc_dump_string(const unsigned char *str)
140 int len = strlen(str);
142 pvc_write_string(str, 0, 0);
143 if (len > PVC_VISIBLE_CHARS)
144 pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1);
148 #define MAX_PROGRAMMABLE_CHARS 8
149 int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE])
154 if (charnum > MAX_PROGRAMMABLE_CHARS)
158 pvc_write(0x40 | addr, MODE_INST);
160 for (i = 0; i < BM_SIZE; i++)
161 pvc_write(bitmap[i], MODE_DATA);
165 #define FUNC_SET_CMD 0x20
166 #define EIGHT_BYTE (1 << 4)
168 #define TWO_LINES (1 << 3)
170 #define LARGE_FONT (1 << 2)
173 static void pvc_funcset(u8 cmd)
175 pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)),
179 #define ENTRYMODE_CMD 0x4
180 #define AUTO_INC (1 << 1)
182 #define CURSOR_FOLLOWS_DISP (1 << 0)
184 static void pvc_entrymode(u8 cmd)
186 pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)),
190 #define DISP_CNT_CMD 0x08
192 #define DISP_ON (1 << 2)
193 #define CUR_ON (1 << 1)
194 #define CUR_BLINK (1 << 0)
195 void pvc_dispcnt(u8 cmd)
197 pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST);
200 #define MOVE_CMD 0x10
201 #define DISPLAY (1 << 3)
203 #define RIGHT (1 << 2)
205 void pvc_move(u8 cmd)
207 pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
210 #define CLEAR_CMD 0x1
213 pvc_write(CLEAR_CMD, MODE_INST);
219 pvc_write(HOME_CMD, MODE_INST);
227 cmd |= (SMALL_FONT|TWO_LINES);
229 cmd |= (LARGE_FONT|ONE_LINE);
231 pvc_dispcnt(DISP_ON);
232 pvc_entrymode(AUTO_INC);
235 pvc_write_string_centered("Display", 0);
236 pvc_write_string_centered("Initialized", 1);
241 module_init(pvc_init);
242 MODULE_LICENSE("GPL");