blob: 445862430adefcb8643eb9ba48880119f60cd0c2 [file] [log] [blame]
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2019 Advanced Micro Devices, Inc.
*
* 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
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/mmio.h>
#include <console/uart.h>
#include <commonlib/helpers.h>
#include <amdblocks/gpio_banks.h>
#include <amdblocks/acpimmio.h>
#include <soc/southbridge.h>
#include <soc/gpio.h>
static const struct _uart_info {
uintptr_t base;
struct soc_amd_gpio mux[2];
} uart_info[] = {
[0] = { APU_UART0_BASE, {
PAD_NF(GPIO_138, UART0_TXD, PULL_NONE),
PAD_NF(GPIO_136, UART0_RXD, PULL_NONE),
} },
[1] = { APU_UART1_BASE, {
PAD_NF(GPIO_143, UART1_TXD, PULL_NONE),
PAD_NF(GPIO_141, UART1_RXD, PULL_NONE),
} },
[2] = { APU_UART2_BASE, {
PAD_NF(GPIO_137, UART2_TXD, PULL_NONE),
PAD_NF(GPIO_135, UART2_RXD, PULL_NONE),
} },
[3] = { APU_UART3_BASE, {
PAD_NF(GPIO_140, UART3_TXD, PULL_NONE),
PAD_NF(GPIO_142, UART3_RXD, PULL_NONE),
} },
};
uintptr_t uart_platform_base(int idx)
{
if (idx < 0 || idx > ARRAY_SIZE(uart_info))
return 0;
return uart_info[idx].base;
}
void set_uart_config(int idx)
{
uint32_t uart_ctrl;
uint16_t uart_leg;
if (idx < 0 || idx > ARRAY_SIZE(uart_info))
return;
program_gpios(uart_info[idx].mux, 2);
if (CONFIG(PICASSO_UART_1_8MZ)) {
uart_ctrl = sm_pci_read32(SMB_UART_CONFIG);
uart_ctrl |= 1 << (SMB_UART_1_8M_SHIFT + idx);
sm_pci_write32(SMB_UART_CONFIG, uart_ctrl);
}
if (CONFIG(PICASSO_UART_LEGACY) && idx != 3) {
/* Force 3F8 if idx=0, 2F8 if idx=1, 3E8 if idx=2 */
/* TODO: make clearer once PPR is updated */
uart_leg = (idx << 8) | (idx << 10) | (idx << 12) | (idx << 14);
if (idx == 0)
uart_leg |= 1 << FCH_LEGACY_3F8_SH;
else if (idx == 1)
uart_leg |= 1 << FCH_LEGACY_2F8_SH;
else if (idx == 2)
uart_leg |= 1 << FCH_LEGACY_3E8_SH;
write16((void *)FCH_UART_LEGACY_DECODE, uart_leg);
}
}
unsigned int uart_platform_refclk(void)
{
return CONFIG(PICASSO_UART_48MZ) ? 48000000 : 115200 * 16;
}