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// SPDX-License-Identifier: GPL-2.0-only
/*
* Picvue PVC160206 display driver
*
* Brian Murphy <brian@murphy.dk>
*
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <asm/bootinfo.h>
#include <asm/lasat/lasat.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/string.h>
#include "picvue.h"
#define PVC_BUSY 0x80
#define PVC_NLINES 2
#define PVC_DISPMEM 80
#define PVC_LINELEN PVC_DISPMEM / PVC_NLINES
struct pvc_defs *picvue;
static void pvc_reg_write(u32 val)
{
*picvue->reg = val;
}
static u32 pvc_reg_read(void)
{
u32 tmp = *picvue->reg;
return tmp;
}
static void pvc_write_byte(u32 data, u8 byte)
{
data |= picvue->e;
pvc_reg_write(data);
data &= ~picvue->data_mask;
data |= byte << picvue->data_shift;
pvc_reg_write(data);
ndelay(220);
pvc_reg_write(data & ~picvue->e);
ndelay(220);
}
static u8 pvc_read_byte(u32 data)
{
u8 byte;
data |= picvue->e;
pvc_reg_write(data);
ndelay(220);
byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift;
data &= ~picvue->e;
pvc_reg_write(data);
ndelay(220);
return byte;
}
static u8 pvc_read_data(void)
{
u32 data = pvc_reg_read();
u8 byte;
data |= picvue->rw;
data &= ~picvue->rs;
pvc_reg_write(data);
ndelay(40);
byte = pvc_read_byte(data);
data |= picvue->rs;
pvc_reg_write(data);
return byte;
}
#define TIMEOUT 1000
static int pvc_wait(void)
{
int i = TIMEOUT;
int err = 0;
while ((pvc_read_data() & PVC_BUSY) && i)
i--;
if (i == 0)
err = -ETIME;
return err;
}
#define MODE_INST 0
#define MODE_DATA 1
static void pvc_write(u8 byte, int mode)
{
u32 data = pvc_reg_read();
data &= ~picvue->rw;
if (mode == MODE_DATA)
data |= picvue->rs;
else
data &= ~picvue->rs;
pvc_reg_write(data);
ndelay(40);
pvc_write_byte(data, byte);
if (mode == MODE_DATA)
data &= ~picvue->rs;
else
data |= picvue->rs;
pvc_reg_write(data);
pvc_wait();
}
void pvc_write_string(const unsigned char *str, u8 addr, int line)
{
int i = 0;
if (line > 0 && (PVC_NLINES > 1))
addr += 0x40 * line;
pvc_write(0x80 | addr, MODE_INST);
while (*str != 0 && i < PVC_LINELEN) {
pvc_write(*str++, MODE_DATA);
i++;
}
}
void pvc_write_string_centered(const unsigned char *str, int line)
{
int len = strlen(str);
u8 addr;
if (len > PVC_VISIBLE_CHARS)
addr = 0;
else
addr = (PVC_VISIBLE_CHARS - strlen(str))/2;
pvc_write_string(str, addr, line);
}
void pvc_dump_string(const unsigned char *str)
{
int len = strlen(str);
pvc_write_string(str, 0, 0);
if (len > PVC_VISIBLE_CHARS)
pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1);
}
#define BM_SIZE 8
#define MAX_PROGRAMMABLE_CHARS 8
int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE])
{
int i;
int addr;
if (charnum > MAX_PROGRAMMABLE_CHARS)
return -ENOENT;
addr = charnum * 8;
pvc_write(0x40 | addr, MODE_INST);
for (i = 0; i < BM_SIZE; i++)
pvc_write(bitmap[i], MODE_DATA);
return 0;
}
#define FUNC_SET_CMD 0x20
#define EIGHT_BYTE (1 << 4)
#define FOUR_BYTE 0
#define TWO_LINES (1 << 3)
#define ONE_LINE 0
#define LARGE_FONT (1 << 2)
#define SMALL_FONT 0
static void pvc_funcset(u8 cmd)
{
pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)),
MODE_INST);
}
#define ENTRYMODE_CMD 0x4
#define AUTO_INC (1 << 1)
#define AUTO_DEC 0
#define CURSOR_FOLLOWS_DISP (1 << 0)
static void pvc_entrymode(u8 cmd)
{
pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)),
MODE_INST);
}
#define DISP_CNT_CMD 0x08
#define DISP_OFF 0
#define DISP_ON (1 << 2)
#define CUR_ON (1 << 1)
#define CUR_BLINK (1 << 0)
void pvc_dispcnt(u8 cmd)
{
pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST);
}
#define MOVE_CMD 0x10
#define DISPLAY (1 << 3)
#define CURSOR 0
#define RIGHT (1 << 2)
#define LEFT 0
void pvc_move(u8 cmd)
{
pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
}
#define CLEAR_CMD 0x1
void pvc_clear(void)
{
pvc_write(CLEAR_CMD, MODE_INST);
}
#define HOME_CMD 0x2
void pvc_home(void)
{
pvc_write(HOME_CMD, MODE_INST);
}
int pvc_init(void)
{
u8 cmd = EIGHT_BYTE;
if (PVC_NLINES == 2)
cmd |= (SMALL_FONT|TWO_LINES);
else
cmd |= (LARGE_FONT|ONE_LINE);
pvc_funcset(cmd);
pvc_dispcnt(DISP_ON);
pvc_entrymode(AUTO_INC);
pvc_clear();
pvc_write_string_centered("Display", 0);
pvc_write_string_centered("Initialized", 1);
return 0;
}
module_init(pvc_init);
MODULE_LICENSE("GPL");
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