| 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 | |
| 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"); |