board/qca/mips32/common/ath_serial.c

/*
 * Copyright (c) 2016 The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 */

#include <asm/addrspace.h>
#include <asm/types.h>
#include <config.h>
#include <atheros.h>
#include <serial.h>

int qca_serial_init(void)
{
//#if !defined(CONFIG_ATH_EMULATION)
	uint32_t div, val;

	div = ath_uart_freq() / (16 * CONFIG_BAUDRATE);
#if defined(CONFIG_SCO_SLAVE_CONNECTED)
	val = ath_reg_rd(GPIO_OE_ADDRESS) & (~0xcbf410u);
#elif defined(CONFIG_MACH_QCA956x)
	val = ath_reg_rd(GPIO_OE_ADDRESS) & 0xbbfdf6;
#else
	val = ath_reg_rd(GPIO_OE_ADDRESS) & (~0xcffc10u);
#endif

#if defined(CONFIG_ATH_SPI_NAND_CS_GPIO)
	val |= 1 << CONFIG_ATH_SPI_NAND_CS_GPIO;
#endif
#if defined(CONFIG_ATH_SPI_CS1_GPIO)
	val |= 1 << CONFIG_ATH_SPI_CS1_GPIO;
#endif
	ath_reg_wr(GPIO_OE_ADDRESS, val);

#ifdef CONFIG_MACH_QCA956x

#if defined(UART_RX20_TX22)

	val = (ath_reg_rd(GPIO_OE_ADDRESS) & (~0x400000));
	ath_reg_wr(GPIO_OE_ADDRESS, val);

	ath_reg_rmw_clear(GPIO_OUT_FUNCTION5_ADDRESS,
			GPIO_OUT_FUNCTION5_ENABLE_GPIO_22_MASK);

	ath_reg_rmw_set(GPIO_OUT_FUNCTION5_ADDRESS,
			GPIO_OUT_FUNCTION5_ENABLE_GPIO_22_SET(0x16));

	ath_reg_rmw_clear(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_MASK);

	ath_reg_rmw_set(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0x14));
#elif defined(UART_RX18_TX22)
	val = (ath_reg_rd(GPIO_OE_ADDRESS) & (~0x400000)) | 0x40000;
	ath_reg_wr(GPIO_OE_ADDRESS, val);

	ath_reg_rmw_clear(GPIO_OUT_FUNCTION5_ADDRESS,
			GPIO_OUT_FUNCTION5_ENABLE_GPIO_22_MASK);
	ath_reg_rmw_set(GPIO_OUT_FUNCTION5_ADDRESS,
			GPIO_OUT_FUNCTION5_ENABLE_GPIO_22_SET(0x16));
	ath_reg_rmw_clear(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_MASK);

	ath_reg_rmw_set(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0x12));

#elif defined(UART_RX18_TX20)
	val = (ath_reg_rd(GPIO_OE_ADDRESS) & (~0x100000)) | 0x40000;
	ath_reg_wr(GPIO_OE_ADDRESS, val);

	val = ath_reg_rd(GPIO_OUT_ADDRESS) | 0xeffff6;
	ath_reg_wr(GPIO_OUT_ADDRESS, val);

	ath_reg_rmw_clear(GPIO_OUT_FUNCTION5_ADDRESS,
			GPIO_OUT_FUNCTION5_ENABLE_GPIO_20_MASK);
	ath_reg_rmw_set(GPIO_OUT_FUNCTION5_ADDRESS,
			GPIO_OUT_FUNCTION5_ENABLE_GPIO_20_SET(0x16));
	ath_reg_rmw_clear(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_MASK);

	ath_reg_rmw_set(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0x12));

#elif defined(UART_RX24_TX20)
	// Turn off LED before XLNA swap to GPO
	val = ath_reg_rd(GPIO_OUT_ADDRESS) | 0xaffff6;
	ath_reg_wr(GPIO_OUT_ADDRESS, val);
	//Switch GPI and GPO and XPA, XLNA
	ath_reg_wr(GPIO_FUNCTION_ADDRESS, 0x8000);

	val = (ath_reg_rd(GPIO_OE_ADDRESS) & (~0x100000)) | 0x1000000;
	ath_reg_wr(GPIO_OE_ADDRESS, val);

	ath_reg_rmw_set(GPIO_OUT_FUNCTION5_ADDRESS,
			GPIO_OUT_FUNCTION5_ENABLE_GPIO_20_SET(0x16));
	ath_reg_rmw_clear(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0xff));

	ath_reg_rmw_set(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0x18));

#elif defined(TEST_BOARD_UART)
	//Switch GPI and GPO and XPA1, ANTC
	ath_reg_wr(GPIO_FUNCTION_ADDRESS, 0xc000);

	val = ath_reg_rd(GPIO_OE_ADDRESS) & (~0x2000);
	ath_reg_wr(GPIO_OE_ADDRESS, val);

	ath_reg_rmw_clear(GPIO_OUT_FUNCTION3_ADDRESS,
			GPIO_OUT_FUNCTION3_ENABLE_GPIO_13_MASK);

	ath_reg_rmw_set(GPIO_OUT_FUNCTION3_ADDRESS,
			GPIO_OUT_FUNCTION3_ENABLE_GPIO_13_SET(0x16));

	ath_reg_rmw_clear(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0xff));

	ath_reg_rmw_set(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0x17));

#else
	val = (ath_reg_rd(GPIO_OE_ADDRESS) & (~0x100000)) | 0x80000;
	ath_reg_wr(GPIO_OE_ADDRESS, val);

	ath_reg_rmw_set(GPIO_OUT_FUNCTION5_ADDRESS,
			GPIO_OUT_FUNCTION5_ENABLE_GPIO_20_SET(0x16));
	ath_reg_rmw_clear(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0xff));

	ath_reg_rmw_set(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0x13));

#endif

	val = ath_reg_rd(GPIO_OUT_ADDRESS) | 0xaffff6;
	ath_reg_wr(GPIO_OUT_ADDRESS, val);

	val = ath_reg_rd(GPIO_SPARE_ADDRESS);
	ath_reg_wr(GPIO_SPARE_ADDRESS, (val | 0x8402));


#else
	ath_reg_rmw_set(GPIO_OUT_FUNCTION2_ADDRESS,
			GPIO_OUT_FUNCTION2_ENABLE_GPIO_10_SET(0x16));

	ath_reg_rmw_clear(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0xff));

	ath_reg_rmw_set(GPIO_IN_ENABLE0_ADDRESS,
			GPIO_IN_ENABLE0_UART_SIN_SET(0x9));

	val = ath_reg_rd(GPIO_OUT_ADDRESS) | 0xcffc10u;
	ath_reg_wr(GPIO_OUT_ADDRESS, val);

	val = ath_reg_rd(GPIO_SPARE_ADDRESS);
	ath_reg_wr(GPIO_SPARE_ADDRESS, (val | 0x8402));

	ath_reg_wr(GPIO_OUT_ADDRESS, 0x2f);
#endif
	/*
	 * set DIAB bit
	 */
	ath_uart_wr(OFS_LINE_CONTROL, 0x80);

	/* set divisor */
	ath_uart_wr(OFS_DIVISOR_LSB, (div & 0xff));
	ath_uart_wr(OFS_DIVISOR_MSB, ((div >> 8) & 0xff));

	/* clear DIAB bit*/
	ath_uart_wr(OFS_LINE_CONTROL, 0x00);

	/* set data format */
	ath_uart_wr(OFS_DATA_FORMAT, 0x3);

	ath_uart_wr(OFS_INTR_ENABLE, 0);
//#endif
	return 0;
}

int qca_serial_tstc (void)
{
	return(ath_uart_rd(OFS_LINE_STATUS) & 0x1);
}

u8 qca_serial_getc(void)
{
	while(!serial_tstc());

	return ath_uart_rd(OFS_RCV_BUFFER);
}


void qca_serial_putc(u8 byte)
{
	if (byte == '\n') serial_putc ('\r');

	while (((ath_uart_rd(OFS_LINE_STATUS)) & 0x20) == 0x0);

	ath_uart_wr(OFS_SEND_BUFFER, byte);
}

void qca_serial_setbrg (void)
{
}

void qca_serial_puts (const char *s)
{
	while (*s)
	{
		serial_putc (*s++);
	}
}

static struct serial_device qca956x_serial_drv = {
        .name   = "qca956x_serial",
        .start  = qca_serial_init,
        .stop   = NULL,
        .setbrg = NULL,
        .putc   = qca_serial_putc,
        .puts   = qca_serial_puts,
        .getc   = qca_serial_getc,
        .tstc   = qca_serial_tstc,
};


void qca_serial_initialize(void)
{
        serial_register(&qca956x_serial_drv);
}

__weak struct serial_device *default_serial_console(void)
{
        return &qca956x_serial_drv;
}