![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
241 lines
4.3 KiB
C
241 lines
4.3 KiB
C
/*
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* Picvue PVC160206 display driver
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*
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* Brian Murphy <brian@murphy.dk>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <asm/bootinfo.h>
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#include <asm/lasat/lasat.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include "picvue.h"
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#define PVC_BUSY 0x80
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#define PVC_NLINES 2
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#define PVC_DISPMEM 80
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#define PVC_LINELEN PVC_DISPMEM / PVC_NLINES
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struct pvc_defs *picvue = NULL;
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DECLARE_MUTEX(pvc_sem);
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static void pvc_reg_write(u32 val)
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{
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*picvue->reg = val;
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}
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static u32 pvc_reg_read(void)
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{
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u32 tmp = *picvue->reg;
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return tmp;
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}
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static void pvc_write_byte(u32 data, u8 byte)
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{
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data |= picvue->e;
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pvc_reg_write(data);
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data &= ~picvue->data_mask;
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data |= byte << picvue->data_shift;
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pvc_reg_write(data);
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ndelay(220);
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pvc_reg_write(data & ~picvue->e);
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ndelay(220);
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}
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static u8 pvc_read_byte(u32 data)
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{
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u8 byte;
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data |= picvue->e;
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pvc_reg_write(data);
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ndelay(220);
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byte = (pvc_reg_read() & picvue->data_mask) >> picvue->data_shift;
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data &= ~picvue->e;
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pvc_reg_write(data);
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ndelay(220);
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return byte;
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}
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static u8 pvc_read_data(void)
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{
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u32 data = pvc_reg_read();
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u8 byte;
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data |= picvue->rw;
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data &= ~picvue->rs;
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pvc_reg_write(data);
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ndelay(40);
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byte = pvc_read_byte(data);
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data |= picvue->rs;
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pvc_reg_write(data);
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return byte;
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}
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#define TIMEOUT 1000
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static int pvc_wait(void)
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{
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int i = TIMEOUT;
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int err = 0;
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while ((pvc_read_data() & PVC_BUSY) && i)
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i--;
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if (i == 0)
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err = -ETIME;
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return err;
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}
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#define MODE_INST 0
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#define MODE_DATA 1
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static void pvc_write(u8 byte, int mode)
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{
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u32 data = pvc_reg_read();
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data &= ~picvue->rw;
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if (mode == MODE_DATA)
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data |= picvue->rs;
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else
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data &= ~picvue->rs;
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pvc_reg_write(data);
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ndelay(40);
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pvc_write_byte(data, byte);
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if (mode == MODE_DATA)
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data &= ~picvue->rs;
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else
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data |= picvue->rs;
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pvc_reg_write(data);
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pvc_wait();
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}
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void pvc_write_string(const unsigned char *str, u8 addr, int line)
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{
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int i = 0;
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if (line > 0 && (PVC_NLINES > 1))
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addr += 0x40 * line;
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pvc_write(0x80 | addr, MODE_INST);
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while (*str != 0 && i < PVC_LINELEN) {
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pvc_write(*str++, MODE_DATA);
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i++;
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}
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}
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void pvc_write_string_centered(const unsigned char *str, int line)
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{
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int len = strlen(str);
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u8 addr;
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if (len > PVC_VISIBLE_CHARS)
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addr = 0;
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else
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addr = (PVC_VISIBLE_CHARS - strlen(str))/2;
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pvc_write_string(str, addr, line);
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}
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void pvc_dump_string(const unsigned char *str)
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{
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int len = strlen(str);
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pvc_write_string(str, 0, 0);
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if (len > PVC_VISIBLE_CHARS)
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pvc_write_string(&str[PVC_VISIBLE_CHARS], 0, 1);
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}
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#define BM_SIZE 8
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#define MAX_PROGRAMMABLE_CHARS 8
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int pvc_program_cg(int charnum, u8 bitmap[BM_SIZE])
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{
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int i;
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int addr;
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if (charnum > MAX_PROGRAMMABLE_CHARS)
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return -ENOENT;
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addr = charnum * 8;
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pvc_write(0x40 | addr, MODE_INST);
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for (i=0; i<BM_SIZE; i++)
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pvc_write(bitmap[i], MODE_DATA);
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return 0;
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}
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#define FUNC_SET_CMD 0x20
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#define EIGHT_BYTE (1 << 4)
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#define FOUR_BYTE 0
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#define TWO_LINES (1 << 3)
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#define ONE_LINE 0
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#define LARGE_FONT (1 << 2)
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#define SMALL_FONT 0
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static void pvc_funcset(u8 cmd)
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{
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pvc_write(FUNC_SET_CMD | (cmd & (EIGHT_BYTE|TWO_LINES|LARGE_FONT)), MODE_INST);
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}
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#define ENTRYMODE_CMD 0x4
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#define AUTO_INC (1 << 1)
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#define AUTO_DEC 0
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#define CURSOR_FOLLOWS_DISP (1 << 0)
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static void pvc_entrymode(u8 cmd)
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{
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pvc_write(ENTRYMODE_CMD | (cmd & (AUTO_INC|CURSOR_FOLLOWS_DISP)), MODE_INST);
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}
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#define DISP_CNT_CMD 0x08
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#define DISP_OFF 0
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#define DISP_ON (1 << 2)
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#define CUR_ON (1 << 1)
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#define CUR_BLINK (1 << 0)
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void pvc_dispcnt(u8 cmd)
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{
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pvc_write(DISP_CNT_CMD | (cmd & (DISP_ON|CUR_ON|CUR_BLINK)), MODE_INST);
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}
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#define MOVE_CMD 0x10
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#define DISPLAY (1 << 3)
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#define CURSOR 0
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#define RIGHT (1 << 2)
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#define LEFT 0
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void pvc_move(u8 cmd)
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{
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pvc_write(MOVE_CMD | (cmd & (DISPLAY|RIGHT)), MODE_INST);
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}
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#define CLEAR_CMD 0x1
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void pvc_clear(void)
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{
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pvc_write(CLEAR_CMD, MODE_INST);
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}
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#define HOME_CMD 0x2
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void pvc_home(void)
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{
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pvc_write(HOME_CMD, MODE_INST);
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}
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int pvc_init(void)
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{
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u8 cmd = EIGHT_BYTE;
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if (PVC_NLINES == 2)
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cmd |= (SMALL_FONT|TWO_LINES);
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else
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cmd |= (LARGE_FONT|ONE_LINE);
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pvc_funcset(cmd);
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pvc_dispcnt(DISP_ON);
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pvc_entrymode(AUTO_INC);
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pvc_clear();
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pvc_write_string_centered("Display", 0);
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pvc_write_string_centered("Initialized", 1);
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return 0;
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}
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module_init(pvc_init);
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MODULE_LICENSE("GPL");
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