diff options
Diffstat (limited to 'src/soc/intel/skylake/uart.c')
| -rw-r--r-- | src/soc/intel/skylake/uart.c | 50 |
1 files changed, 48 insertions, 2 deletions
diff --git a/src/soc/intel/skylake/uart.c b/src/soc/intel/skylake/uart.c index 31389297b3..6f3c21e586 100644 --- a/src/soc/intel/skylake/uart.c +++ b/src/soc/intel/skylake/uart.c @@ -2,7 +2,7 @@ * This file is part of the coreboot project. * * Copyright (C) 2015 Google Inc. - * Copyright (C) 2015 Intel Corporation + * Copyright (C) 2015-2017 Intel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -15,11 +15,57 @@ */ #include <cbmem.h> +#include <console/uart.h> #include <device/pci.h> +#include <device/pci_def.h> +#include <gpio.h> +#include <intelblocks/lpss.h> +#include <intelblocks/pcr.h> #include <intelblocks/uart.h> -#include <soc/iomap.h> +#include <soc/bootblock.h> #include <soc/nvs.h> #include <soc/pci_devs.h> +#include <soc/pcr_ids.h> + +/* Serial IO UART controller legacy mode */ +#define PCR_SERIAL_IO_GPPRVRW7 0x618 +#define PCR_SIO_PCH_LEGACY_UART(idx) (1 << (idx)) + +/* UART2 pad configuration. Support RXD and TXD for now. */ +static const struct pad_config uart2_pads[] = { +/* UART2_RXD */ PAD_CFG_NF(GPP_C20, NONE, DEEP, NF1), +/* UART2_TXD */ PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1), +}; + +#if IS_ENABLED(CONFIG_DRIVERS_UART_8250MEM) +uintptr_t uart_platform_base(int idx) +{ + /* Same base address for all debug port usage. In reality UART2 + * is currently only supported. */ + return UART_BASE_0_ADDR(idx); +} +#endif + +void pch_uart_init(void) +{ + uintptr_t base = uart_platform_base(CONFIG_UART_FOR_CONSOLE); + + uart_common_init(PCH_DEV_UART2, base); + + /* Put UART2 in byte access mode for 16550 compatibility */ + if (!IS_ENABLED(CONFIG_DRIVERS_UART_8250MEM_32)) { + pcr_write32(PID_SERIALIO, PCR_SERIAL_IO_GPPRVRW7, + PCR_SIO_PCH_LEGACY_UART(CONFIG_UART_FOR_CONSOLE)); + + /* + * Dummy read after setting any of GPPRVRW7. + * Required for UART 16550 8-bit Legacy mode to become active + */ + lpss_clk_read(base); + } + + gpio_configure_pads(uart2_pads, ARRAY_SIZE(uart2_pads)); +} #if !ENV_SMM void pch_uart_read_resources(struct device *dev) |