uboot-phytec

// SPDX-License-Identifier: GPL-2.0

/*

 * LCD: Formike, TFT 4.3", 480x800, RGB24, KWH043ST20-F01, DriverIC NT35510-16

 * LCD initialization via SPI

 * Based on:

 *

 */

#include <common.h>

#include <errno.h>

#include <spi.h>

​

#define TAG_READ    0x80

#define TAG_WRITE   0x00

​

#define TAG_DATA    0x40

#define TAG_COMMAND 0x00

​

#define TAG_ADDR_H  0x20

#define TAG_ADDR_L  0x00

​

static int spi_write_tag_val(struct spi_slave *spi, unsigned char tag,

                 unsigned char val)

{

    unsigned long flags = SPI_XFER_BEGIN;

    u8 buf[2];

    int ret;

​

    buf[0] = tag;

    ret = spi_xfer(spi, 8, buf, NULL, flags);

    buf[0] = val;

    flags = SPI_XFER_END;

    ret = spi_xfer(spi, 8, buf, NULL, flags);

​

#ifdef KWH043ST20_F01_SPI_DEBUG

    printf("spi_write_tag_val: tag=%02X, val=%02X ret: %d\n",

           tag, val, ret);

#endif /* KWH043ST20_F01_SPI_DEBUG */

    if (ret)

        debug("%s: Failed to send: %d\n", __func__, ret);

​

    return ret;

}

​

static void spi_write_dat(struct spi_slave *spi, unsigned int val)

{

    spi_write_tag_val(spi, TAG_WRITE|TAG_DATA, val);

}

​

static void spi_write_com(struct spi_slave *spi, unsigned int addr)

{

    spi_write_tag_val(spi, TAG_WRITE|TAG_COMMAND|TAG_ADDR_H,

              (addr & 0xff00) >> 8);

    spi_write_tag_val(spi, TAG_WRITE|TAG_COMMAND|TAG_ADDR_L,

              (addr & 0x00ff) >> 0);

}

​

int kwh043st20_f01_spi_startup(unsigned int bus, unsigned int cs,

    unsigned int max_hz, unsigned int spi_mode)

{

    struct spi_slave *spi;

    int ret;

​

    spi = spi_setup_slave(bus, cs, max_hz, spi_mode);

    if (!spi) {

        debug("%s: Failed to set up slave\n", __func__);

        return -1;

    }

​

    ret = spi_claim_bus(spi);

    if (ret) {

        debug("%s: Failed to claim SPI bus: %d\n", __func__, ret);

        goto err_claim_bus;

    }

​

​

    /* LV2 Page 1 enable */

    spi_write_com(spi, 0xF000); spi_write_dat(spi, 0x55);

    spi_write_com(spi, 0xF001); spi_write_dat(spi, 0xAA);

    spi_write_com(spi, 0xF002); spi_write_dat(spi, 0x52);

    spi_write_com(spi, 0xF003); spi_write_dat(spi, 0x08);

    spi_write_com(spi, 0xF004); spi_write_dat(spi, 0x01);

​

    /* AVDD Set AVDD 5.2V */

    spi_write_com(spi, 0xB000); spi_write_dat(spi, 0x0D);

    spi_write_com(spi, 0xB001); spi_write_dat(spi, 0x0D);

    spi_write_com(spi, 0xB002); spi_write_dat(spi, 0x0D);

​

    /* AVDD ratio */

    spi_write_com(spi, 0xB600); spi_write_dat(spi, 0x34);

    spi_write_com(spi, 0xB601); spi_write_dat(spi, 0x34);

    spi_write_com(spi, 0xB602); spi_write_dat(spi, 0x34);

​