diff options
Diffstat (limited to 'src/cpu/samsung/exynos5420/uart.c')
| -rw-r--r-- | src/cpu/samsung/exynos5420/uart.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/src/cpu/samsung/exynos5420/uart.c b/src/cpu/samsung/exynos5420/uart.c deleted file mode 100644 index be96d5b86c..0000000000 --- a/src/cpu/samsung/exynos5420/uart.c +++ /dev/null @@ -1,194 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2009 Samsung Electronics - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include <types.h> -#include <console/uart.h> -#include <arch/io.h> -#include <boot/coreboot_tables.h> -#include "uart.h" -#include "clk.h" -#include "cpu.h" -#include "periph.h" -#include "uart.h" - -#define RX_FIFO_COUNT_MASK 0xff -#define RX_FIFO_FULL_MASK (1 << 8) -#define TX_FIFO_FULL_MASK (1 << 24) - - -/* - * The coefficient, used to calculate the baudrate on S5P UARTs is - * calculated as - * C = UBRDIV * 16 + number_of_set_bits_in_UDIVSLOT - * however, section 31.6.11 of the datasheet doesn't recomment using 1 for 1, - * 3 for 2, ... (2^n - 1) for n, instead, they suggest using these constants: - */ -static const int udivslot[] = { - 0, - 0x0080, - 0x0808, - 0x0888, - 0x2222, - 0x4924, - 0x4a52, - 0x54aa, - 0x5555, - 0xd555, - 0xd5d5, - 0xddd5, - 0xdddd, - 0xdfdd, - 0xdfdf, - 0xffdf, -}; - -static void serial_setbrg_dev(struct s5p_uart *uart) -{ - u32 uclk; - u32 val; - - // All UARTs share the same clock. - uclk = clock_get_periph_rate(PERIPH_ID_UART3); - val = uclk / default_baudrate(); - - writel(val / 16 - 1, &uart->ubrdiv); - - /* - * FIXME(dhendrix): the original uart.h had a "br_rest" value which - * does not seem relevant to the exynos5420... not entirely sure - * where/if we need to worry about it here - */ -#if 0 - if (s5p_uart_divslot()) - writel(udivslot[val % 16], &uart->rest.slot); - else - writeb(val % 16, &uart->rest.value); -#endif -} - -/* - * Initialise the serial port with the given baudrate. The settings - * are always 8 data bits, no parity, 1 stop bit, no start bits. - */ -static void exynos5_init_dev(struct s5p_uart *uart) -{ - /* enable FIFOs */ - writel(0x1, &uart->ufcon); - writel(0, &uart->umcon); - /* 8N1 */ - writel(0x3, &uart->ulcon); - /* No interrupts, no DMA, pure polling */ - writel(0x245, &uart->ucon); - - serial_setbrg_dev(uart); -} - -static int exynos5_uart_err_check(struct s5p_uart *uart, int op) -{ - unsigned int mask; - - /* - * UERSTAT - * Break Detect [3] - * Frame Err [2] : receive operation - * Parity Err [1] : receive operation - * Overrun Err [0] : receive operation - */ - if (op) - mask = 0x8; - else - mask = 0xf; - - return readl(&uart->uerstat) & mask; -} - -/* - * Read a single byte from the serial port. Returns 1 on success, 0 - * otherwise. When the function is succesfull, the character read is - * written into its argument c. - */ -static unsigned char exynos5_uart_rx_byte(struct s5p_uart *uart) -{ - /* wait for character to arrive */ - while (!(readl(&uart->ufstat) & (RX_FIFO_COUNT_MASK | - RX_FIFO_FULL_MASK))) { - if (exynos5_uart_err_check(uart, 0)) - return 0; - } - - return readb(&uart->urxh) & 0xff; -} - -/* - * Output a single byte to the serial port. - */ -static void exynos5_uart_tx_byte(struct s5p_uart *uart, unsigned char data) -{ - /* wait for room in the tx FIFO */ - while ((readl(&uart->ufstat) & TX_FIFO_FULL_MASK)) { - if (exynos5_uart_err_check(uart, 1)) - return; - } - - writeb(data, &uart->utxh); -} - -unsigned int uart_platform_base(int idx) -{ - if (idx < 4) - return 0x12c00000 + idx * 0x10000; - else - return 0; -} - -void uart_init(int idx) -{ - struct s5p_uart *uart = uart_platform_baseptr(idx); - exynos5_init_dev(uart); -} - -unsigned char uart_rx_byte(int idx) -{ - struct s5p_uart *uart = uart_platform_baseptr(idx); - return exynos5_uart_rx_byte(uart); -} - -void uart_tx_byte(int idx, unsigned char data) -{ - struct s5p_uart *uart = uart_platform_baseptr(idx); - exynos5_uart_tx_byte(uart, data); -} - -void uart_tx_flush(int idx) -{ - /* Exynos5250 implements this too. */ -} - -#ifndef __PRE_RAM__ -void uart_fill_lb(void *data) -{ - struct lb_serial serial; - serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED; - serial.baseaddr = uart_platform_base(CONFIG_UART_FOR_CONSOLE); - serial.baud = default_baudrate(); - lb_add_serial(&serial, data); - - lb_add_console(LB_TAG_CONSOLE_SERIAL8250MEM, data); -} -#endif |