projects / thirdparty / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| de9ac9a1 BM |
2 | /* |
| 3 | * Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com> | |
| de9ac9a1 BM |
4 | */ |
| 5 | ||
| d678a59d | 6 | #include <common.h> |
| de9ac9a1 BM |
7 | #include <asm/io.h> |
| 8 | ||
| 9 | #define PCI_DEV_CONFIG(segbus, dev, fn) ( \ | |
| 10 | (((segbus) & 0xfff) << 20) | \ | |
| 11 | (((dev) & 0x1f) << 15) | \ | |
| 12 | (((fn) & 0x07) << 12)) | |
| 13 | ||
| 14 | /* Platform Controller Unit */ | |
| 15 | #define LPC_DEV 0x1f | |
| 16 | #define LPC_FUNC 0 | |
| 17 | ||
| 18 | /* Enable UART */ | |
| 19 | #define UART_CONT 0x80 | |
| 20 | ||
| 21 | /* UART PAD definitions */ | |
| 22 | #define UART_RXD_COMMUITY 1 | |
| 23 | #define UART_TXD_COMMUITY 1 | |
| 24 | #define UART_RXD_FAMILY 4 | |
| 25 | #define UART_TXD_FAMILY 4 | |
| 26 | #define UART_RXD_PAD 2 | |
| 27 | #define UART_TXD_PAD 7 | |
| 28 | #define UART_RXD_FUNC 3 | |
| 29 | #define UART_TXD_FUNC 3 | |
| 30 | ||
| 31 | /* IO Memory */ | |
| 32 | #define IO_BASE_ADDRESS 0xfed80000 | |
| 33 | ||
| 34 | static inline uint32_t gpio_pconf0(int community, int family, int pad) | |
| 35 | { | |
| 36 | return IO_BASE_ADDRESS + community * 0x8000 + 0x4400 + | |
| 37 | family * 0x400 + pad * 8; | |
| 38 | } | |
| 39 | ||
| 40 | static void gpio_select_func(int community, int family, int pad, int func) | |
| 41 | { | |
| 42 | uint32_t pconf0_addr = gpio_pconf0(community, family, pad); | |
| 43 | ||
| 44 | clrsetbits_le32(pconf0_addr, 0xf << 16, func << 16); | |
| 45 | } | |
| 46 | ||
| 47 | static void x86_pci_write_config32(int dev, unsigned int where, u32 value) | |
| 48 | { | |
| 49 | unsigned long addr; | |
| 50 | ||
| 51 | addr = CONFIG_PCIE_ECAM_BASE | dev | (where & ~3); | |
| 52 | writel(value, addr); | |
| 53 | } | |
| 54 | ||
| 55 | /* This can be called after memory-mapped PCI is working */ | |
| 56 | int setup_internal_uart(int enable) | |
| 57 | { | |
| 58 | /* Enable or disable the legacy UART hardware */ | |
| 59 | x86_pci_write_config32(PCI_DEV_CONFIG(0, LPC_DEV, LPC_FUNC), UART_CONT, | |
| 60 | enable); | |
| 61 | ||
| 62 | /* All done for the disable part, so just return */ | |
| 63 | if (!enable) | |
| 64 | return 0; | |
| 65 | ||
| 66 | /* | |
| 67 | * Set up the pads to the UART function. This allows the signals to | |
| 68 | * leave the chip | |
| 69 | */ | |
| 70 | gpio_select_func(UART_RXD_COMMUITY, UART_RXD_FAMILY, | |
| 71 | UART_RXD_PAD, UART_RXD_FUNC); | |
| 72 | gpio_select_func(UART_TXD_COMMUITY, UART_TXD_FAMILY, | |
| 73 | UART_TXD_PAD, UART_TXD_FUNC); | |
| 74 | ||
| 75 | return 0; | |
| 76 | } | |
| 77 | ||
| 78 | void board_debug_uart_init(void) | |
| 79 | { | |
| 80 | setup_internal_uart(1); | |
| 81 | } |