| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com> |
| */ |
| |
| #include <asm/io.h> |
| |
| #define PCI_DEV_CONFIG(segbus, dev, fn) ( \ |
| (((segbus) & 0xfff) << 20) | \ |
| (((dev) & 0x1f) << 15) | \ |
| (((fn) & 0x07) << 12)) |
| |
| /* Platform Controller Unit */ |
| #define LPC_DEV 0x1f |
| #define LPC_FUNC 0 |
| |
| /* Enable UART */ |
| #define UART_CONT 0x80 |
| |
| /* UART PAD definitions */ |
| #define UART_RXD_COMMUITY 1 |
| #define UART_TXD_COMMUITY 1 |
| #define UART_RXD_FAMILY 4 |
| #define UART_TXD_FAMILY 4 |
| #define UART_RXD_PAD 2 |
| #define UART_TXD_PAD 7 |
| #define UART_RXD_FUNC 3 |
| #define UART_TXD_FUNC 3 |
| |
| /* IO Memory */ |
| #define IO_BASE_ADDRESS 0xfed80000 |
| |
| static inline uint32_t gpio_pconf0(int community, int family, int pad) |
| { |
| return IO_BASE_ADDRESS + community * 0x8000 + 0x4400 + |
| family * 0x400 + pad * 8; |
| } |
| |
| static void gpio_select_func(int community, int family, int pad, int func) |
| { |
| uint32_t pconf0_addr = gpio_pconf0(community, family, pad); |
| |
| clrsetbits_le32(pconf0_addr, 0xf << 16, func << 16); |
| } |
| |
| static void x86_pci_write_config32(int dev, unsigned int where, u32 value) |
| { |
| unsigned long addr; |
| |
| addr = CONFIG_PCIE_ECAM_BASE | dev | (where & ~3); |
| writel(value, addr); |
| } |
| |
| /* This can be called after memory-mapped PCI is working */ |
| int setup_internal_uart(int enable) |
| { |
| /* Enable or disable the legacy UART hardware */ |
| x86_pci_write_config32(PCI_DEV_CONFIG(0, LPC_DEV, LPC_FUNC), UART_CONT, |
| enable); |
| |
| /* All done for the disable part, so just return */ |
| if (!enable) |
| return 0; |
| |
| /* |
| * Set up the pads to the UART function. This allows the signals to |
| * leave the chip |
| */ |
| gpio_select_func(UART_RXD_COMMUITY, UART_RXD_FAMILY, |
| UART_RXD_PAD, UART_RXD_FUNC); |
| gpio_select_func(UART_TXD_COMMUITY, UART_TXD_FAMILY, |
| UART_TXD_PAD, UART_TXD_FUNC); |
| |
| return 0; |
| } |
| |
| void board_debug_uart_init(void) |
| { |
| setup_internal_uart(1); |
| } |