arch/mips/lasat/picvue.c

   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 = NULL;
  24
  25 DECLARE_MUTEX(pvc_sem);
  26
  27 static void pvc_reg_write(u32 val)
  28 {
  29         *picvue->reg = val;
  30 }
  31
  32 static u32 pvc_reg_read(void)
  33 {
  34         u32 tmp = *picvue->reg;
  35         return tmp;
  36 }
  37
  38 static void pvc_write_byte(u32 data, u8 byte)
  39 {
  40         data |= picvue->e;
  41         pvc_reg_write(data);
  42         data &= ~picvue->data_mask;
  43         data |= byte << picvue->data_shift;
  44         pvc_reg_write(data);
  45         ndelay(220);
  46         pvc_reg_write(data & ~picvue->e);
  47         ndelay(220);
  48 }
  49
  50 static u8 pvc_read_byte(u32 data)
  51 {
  52         u8 byte;
  53
  54         data |= picvue->e;
  55         pvc_reg_write(data);
  56         ndelay(220);
  57         byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift;
  58         data &= ~picvue->e;
  59         pvc_reg_write(data);
  60         ndelay(220);
  61         return byte;
  62 }
  63
  64 static u8 pvc_read_data(void)
  65 {
  66         u32 data = pvc_reg_read();
  67         u8 byte;
  68         data |= picvue->rw;
  69         data &= ~picvue->rs;
  70         pvc_reg_write(data);
  71         ndelay(40);
  72         byte = pvc_read_byte(data);
  73         data |= picvue->rs;
  74         pvc_reg_write(data);
  75         return byte;
  76 }
  77
  78 #define TIMEOUT 1000
  79 static int pvc_wait(void)
  80 {
  81         int i = TIMEOUT;
  82         int err = 0;
  83
  84         while ((pvc_read_data() & PVC_BUSY) && i)
  85                 i--;
  86         if (i == 0)
  87                 err = -ETIME;
  88
  89         return err;
  90 }
  91
  92 #define MODE_INST 0
  93 #define MODE_DATA 1
  94 static void pvc_write(u8 byte, int mode)
  95 {
  96         u32 data = pvc_reg_read();
  97         data &= ~picvue->rw;
  98         if (mode == MODE_DATA)
  99                 data |= picvue->rs;
 100         else
 101                 data &= ~picvue->rs;
 102         pvc_reg_write(data);
 103         ndelay(40);
 104         pvc_write_byte(data, byte);
 105         if (mode == MODE_DATA)
 106                 data &= ~picvue->rs;
 107         else
 108                 data |= picvue->rs;
 109         pvc_reg_write(data);
 110         pvc_wait();
 111 }
 112
 113 void pvc_write_string(const unsigned char *str, u8 addr, int line)
 114 {
 115         int i = 0;
 116
 117         if (line > 0 && (PVC_NLINES > 1))
 118                 addr += 0x40 * line;
 119         pvc_write(0x80 | addr, MODE_INST);
 120
 121         while (*str != 0 && i < PVC_LINELEN) {
 122                 pvc_write(*str++, MODE_DATA);
 123                 i++;
 124         }
 125 }
 126
 127 void pvc_write_string_centered(const unsigned char *str, int line)
 128 {
 129         int len = strlen(str);
 130         u8 addr;
 131
 132         if (len > PVC_VISIBLE_CHARS)
 133                 addr = 0;
 134         else
 135                 addr = (PVC_VISIBLE_CHARS - strlen(str))/2;
 136
 137         pvc_write_string(str, addr, line);
 138 }
 139
 140 void pvc_dump_string(const unsigned char *str)
 141 {
 142         int len = strlen(str);
 143
 144         pvc_write_string(str, 0, 0);
 145         if (len > PVC_VISIBLE_CHARS)
 146                 pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1);
 147 }
 148
 149 #define BM_SIZE                 8
 150 #define MAX_PROGRAMMABLE_CHARS  8
 151 int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE])
 152 {
 153         int i;
 154         int addr;
 155
 156         if (charnum > MAX_PROGRAMMABLE_CHARS)
 157                 return -ENOENT;
 158
 159         addr = charnum * 8;
 160         pvc_write(0x40 | addr, MODE_INST);
 161
 162         for (i=0; i<BM_SIZE; i++)
 163                 pvc_write(bitmap[i], MODE_DATA);
 164         return 0;
 165 }
 166
 167 #define FUNC_SET_CMD    0x20
 168 #define  EIGHT_BYTE     (1 << 4)
 169 #define  FOUR_BYTE      0
 170 #define  TWO_LINES      (1 << 3)
 171 #define  ONE_LINE       0
 172 #define  LARGE_FONT     (1 << 2)
 173 #define  SMALL_FONT     0
 174 static void pvc_funcset(u8 cmd)
 175 {
 176         pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)), 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 static void pvc_entrymode(u8 cmd)
 184 {
 185         pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)), MODE_INST);
 186 }
 187
 188 #define DISP_CNT_CMD    0x08
 189 #define  DISP_OFF       0
 190 #define  DISP_ON        (1 << 2)
 191 #define  CUR_ON         (1 << 1)
 192 #define  CUR_BLINK      (1 << 0)
 193 void pvc_dispcnt(u8 cmd)
 194 {
 195         pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST);
 196 }
 197
 198 #define MOVE_CMD        0x10
 199 #define  DISPLAY        (1 << 3)
 200 #define  CURSOR         0
 201 #define  RIGHT          (1 << 2)
 202 #define  LEFT           0
 203 void pvc_move(u8 cmd)
 204 {
 205         pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
 206 }
 207
 208 #define CLEAR_CMD       0x1
 209 void pvc_clear(void)
 210 {
 211         pvc_write(CLEAR_CMD, MODE_INST);
 212 }
 213
 214 #define HOME_CMD        0x2
 215 void pvc_home(void)
 216 {
 217         pvc_write(HOME_CMD, MODE_INST);
 218 }
 219
 220 int pvc_init(void)
 221 {
 222         u8 cmd = EIGHT_BYTE;
 223
 224         if (PVC_NLINES == 2)
 225                 cmd |= (SMALL_FONT|TWO_LINES);
 226         else
 227                 cmd |= (LARGE_FONT|ONE_LINE);
 228         pvc_funcset(cmd);
 229         pvc_dispcnt(DISP_ON);
 230         pvc_entrymode(AUTO_INC);
 231
 232         pvc_clear();
 233         pvc_write_string_centered("Display", 0);
 234         pvc_write_string_centered("Initialized", 1);
 235
 236         return 0;
 237 }
 238
 239 module_init(pvc_init);
 240 MODULE_LICENSE("GPL");