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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2019 Rockchip Electronics Co., Ltd
*/
#include <asm/io.h>
#include <asm/arch-rockchip/grf_rk322x.h>
#include <asm/arch-rockchip/hardware.h>
#ifdef CONFIG_DEBUG_UART_BOARD_INIT
void board_debug_uart_init(void)
{
#define GRF_BASE 0x11000000
static struct rk322x_grf * const grf = (void *)GRF_BASE;
enum {
GPIO1B2_SHIFT = 4,
GPIO1B2_MASK = 3 << GPIO1B2_SHIFT,
GPIO1B2_GPIO = 0,
GPIO1B2_UART1_SIN,
GPIO1B2_UART21_SIN,
GPIO1B1_SHIFT = 2,
GPIO1B1_MASK = 3 << GPIO1B1_SHIFT,
GPIO1B1_GPIO = 0,
GPIO1B1_UART1_SOUT,
GPIO1B1_UART21_SOUT,
};
enum {
CON_IOMUX_UART2SEL_SHIFT = 8,
CON_IOMUX_UART2SEL_MASK = 1 << CON_IOMUX_UART2SEL_SHIFT,
CON_IOMUX_UART2SEL_2 = 0,
CON_IOMUX_UART2SEL_21,
};
/* Enable early UART2 channel 1 on the RK322x */
rk_clrsetreg(&grf->gpio1b_iomux,
GPIO1B1_MASK | GPIO1B2_MASK,
GPIO1B2_UART21_SIN << GPIO1B2_SHIFT |
GPIO1B1_UART21_SOUT << GPIO1B1_SHIFT);
/* Set channel C as UART2 input */
rk_clrsetreg(&grf->con_iomux,
CON_IOMUX_UART2SEL_MASK,
CON_IOMUX_UART2SEL_21 << CON_IOMUX_UART2SEL_SHIFT);
}
#endif
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