| /* |
| * Copyright (c) 2023, Pengutronix. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <lib/mmio.h> |
| #include <platform_def.h> |
| |
| #define UCR1 0x80 |
| #define UCR1_UARTEN BIT(0) |
| #define DOMAIN0_RUNNING(d) (((d) & 0x3) != 0) |
| |
| static struct imx_uart { |
| unsigned int ccm_reg; |
| unsigned int uart_base; |
| } imx8m_uart_info[] = { |
| { /* UART 1 */ |
| .ccm_reg = 0x4490, |
| .uart_base = 0x30860000, |
| }, { /* UART 2 */ |
| .ccm_reg = 0x44a0, |
| .uart_base = 0x30890000, |
| }, { /* UART 3 */ |
| .ccm_reg = 0x44b0, |
| .uart_base = 0x30880000, |
| }, { /* UART 4 */ |
| .ccm_reg = 0x44c0, |
| .uart_base = 0x30a60000, |
| } |
| }; |
| |
| unsigned int imx8m_uart_get_base(void) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < ARRAY_SIZE(imx8m_uart_info); i++) { |
| uint32_t val; |
| |
| /* |
| * At least check that the clock-gate is ungated before we |
| * access the UART register. |
| */ |
| val = mmio_read_32(IMX_CCM_BASE + imx8m_uart_info[i].ccm_reg); |
| if (DOMAIN0_RUNNING(val)) { |
| val = mmio_read_32(imx8m_uart_info[i].uart_base + UCR1); |
| if (val & UCR1_UARTEN) { |
| return imx8m_uart_info[i].uart_base; |
| } |
| } |
| } |
| |
| /* |
| * We should return an error and inform the user but we can't do it |
| * this early. |
| */ |
| return 0; |
| } |