ltv350qv.c

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/* Copyright (c) 2007, Atmel Corporation All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name of ATMEL may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
 * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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#include "spi.h"
#include "pm.h"
#include <stdio.h>
#include <sys/sysregs.h>

#define sysreg_read(addr)            __builtin_mfsr(addr)
#define sysreg_write(addr, value)    __builtin_mtsr(addr, value)


#define write_reg(spi, reg, val)                                \
        do {                                            \
                ret = ltv350qv_write_reg(spi, reg, val);        \
                if (ret){                               \
                        usart_print(usart, "Error spi timeout\n");\
                        goto out;                       \
                }\
        } while (0)

extern volatile struct avr32_usart_t *usart;
extern void usart_print(volatile struct avr32_usart_t * usart, char *str);

static inline unsigned int get_count(void)
{
        return sysreg_read(SYSREG_COUNT);
}

void usdelay(unsigned long usec)
{
        unsigned long start, stop;
        unsigned long ticks;

        start = get_count();
        ticks = usec * (pm_read_mclk() / 1000000);
        stop = start + ticks;

        if (start > stop)
                while (get_count() > start) ;
        
        while (get_count() < stop) ;
}
static int ltv350qv_write_reg(volatile avr32_spi_t * spi, unsigned char reg, unsigned short val)
{
        int i;
        unsigned char buffer[3];

        buffer[0] = 0x74;
        buffer[1] = 0x00;
        buffer[2] = reg & 0x7f;
        
        for( i = 0; i <= 2; i++){
                if( spi_variableSlaveWrite(spi, buffer[i], 1, (i == 2 ? 1 : 0)) != SPI_OK)
                        return -1;
        }

        buffer[0] = 0x76;
        buffer[1] = val >> 8;
        buffer[2] = val;
        
        for( i = 0; i <= 2; i++){
                if( spi_variableSlaveWrite(spi, buffer[i], 1, (i == 2 ? 1 : 0)) != SPI_OK)
                        return -1;
        }
        return 0;
}

void ltv350qv_power_on(volatile avr32_spi_t * spi, unsigned char chip_select)
{
        int ret;

        usart_print(usart,"ltv350qv: do power on sequence\n");
        spi_selectChip(spi, chip_select);
        /* write startup procedure */
        write_reg(spi, 9, 0x0000);
        usdelay(15000);
        write_reg(spi, 9, 0x4000);
        write_reg(spi, 10, 0x2000);
        write_reg(spi, 9, 0x4055);
        usdelay(55000);
        write_reg(spi, 1, 0x409d);
        write_reg(spi, 2, 0x0204);
        write_reg(spi, 3, 0x0100);
        write_reg(spi, 4, 0x3000);
        write_reg(spi, 5, 0x4003);
        write_reg(spi, 6, 0x000a);
        write_reg(spi, 7, 0x0021);
        write_reg(spi, 8, 0x0c00);
        write_reg(spi, 10, 0x0103);
        write_reg(spi, 11, 0x0301);
        write_reg(spi, 12, 0x1f0f);
        write_reg(spi, 13, 0x1f0f);
        write_reg(spi, 14, 0x0707);
        write_reg(spi, 15, 0x0307);
        write_reg(spi, 16, 0x0707);
        write_reg(spi, 17, 0x0000);
        write_reg(spi, 18, 0x0004);
        write_reg(spi, 19, 0x0000);

        usdelay(20000);
        write_reg(spi, 9, 0x4a55);
        write_reg(spi, 5, 0x5003);

        usart_print(usart,"ltv350qv: power on sequence done\n");
out:
        return;
}
void ltv350qv_power_off(volatile avr32_spi_t * spi, unsigned char chip_select)
{
        int ret;
        spi_selectChip(spi, chip_select);
        usart_print(usart,"ltv350qv: do power off sequence\n");
        /* GON -> 0, POC -> 0 */
        write_reg(spi, 9, 0x4055);
        /* DSC -> 0 */
        write_reg(spi, 5, 0x4003);
        /* VCOMG -> 0 */
        write_reg(spi, 10, 0x2103);

        usdelay(1000000);

        /* AP[2:0] -> 000 */
        write_reg(spi, 9, 0x4050);

        usart_print(usart,"ltv350qv: power off sequence done\n");
out:
        return;
}

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