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lib: utils/serial: Add support for Gaisler APBUART
This patch adds support for the UART used by the NOEL-V processor. Cobham Gaisler's NOEL-V RISC-V processor IP is available under GPL and commercial license and is described in more detail at https://www.gaisler.com/noelv. Signed-off-by: Daniel Cederman <cederman@gaisler.com> Reviewed-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
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7 changed files with 185 additions and 0 deletions
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@ -39,6 +39,9 @@ int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid);
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int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid);
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int fdt_parse_gaisler_uart_node(void *fdt, int nodeoffset,
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struct platform_uart_data *uart);
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int fdt_parse_shakti_uart_node(void *fdt, int nodeoffset,
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struct platform_uart_data *uart);
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17
include/sbi_utils/serial/gaisler-uart.h
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17
include/sbi_utils/serial/gaisler-uart.h
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@ -0,0 +1,17 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Cobham Gaisler AB.
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*
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* Authors:
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* Daniel Cederman <cederman@gaisler.com>
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*/
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#ifndef __SERIAL_GAISLER_APBUART_H__
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#define __SERIAL_GAISLER_APBUART_H__
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#include <sbi/sbi_types.h>
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int gaisler_uart_init(unsigned long base, u32 in_freq, u32 baudrate);
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#endif
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@ -26,6 +26,8 @@
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#define DEFAULT_SIFIVE_UART_REG_SHIFT 0
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#define DEFAULT_SIFIVE_UART_REG_IO_WIDTH 4
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#define DEFAULT_GAISLER_UART_REG_IO_WIDTH 4
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#define DEFAULT_SHAKTI_UART_FREQ 50000000
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#define DEFAULT_SHAKTI_UART_BAUD 115200
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@ -213,6 +215,44 @@ int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid)
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return 0;
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}
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int fdt_parse_gaisler_uart_node(void *fdt, int nodeoffset,
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struct platform_uart_data *uart)
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{
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int len, rc;
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const fdt32_t *val;
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unsigned long reg_addr, reg_size;
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if (nodeoffset < 0 || !uart || !fdt)
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return SBI_ENODEV;
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rc = fdt_get_node_addr_size(fdt, nodeoffset, ®_addr, ®_size);
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if (rc < 0 || !reg_addr || !reg_size)
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return SBI_ENODEV;
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uart->addr = reg_addr;
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/**
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* UART address is mandatory. clock-frequency and current-speed
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* may not be present. Don't return error.
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*/
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val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "clock-frequency", &len);
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if (len > 0 && val)
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uart->freq = fdt32_to_cpu(*val);
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else
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uart->freq = DEFAULT_UART_FREQ;
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val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "current-speed", &len);
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if (len > 0 && val)
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uart->baud = fdt32_to_cpu(*val);
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else
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uart->baud = DEFAULT_UART_BAUD;
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/* For Gaisler APBUART, the reg-shift and reg-io-width are fixed .*/
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uart->reg_shift = DEFAULT_UART_REG_SHIFT;
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uart->reg_io_width = DEFAULT_GAISLER_UART_REG_IO_WIDTH;
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return 0;
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}
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int fdt_parse_shakti_uart_node(void *fdt, int nodeoffset,
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struct platform_uart_data *uart)
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{
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@ -16,12 +16,14 @@ extern struct fdt_serial fdt_serial_uart8250;
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extern struct fdt_serial fdt_serial_sifive;
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extern struct fdt_serial fdt_serial_htif;
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extern struct fdt_serial fdt_serial_shakti;
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extern struct fdt_serial fdt_serial_gaisler;
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static struct fdt_serial *serial_drivers[] = {
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&fdt_serial_uart8250,
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&fdt_serial_sifive,
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&fdt_serial_htif,
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&fdt_serial_shakti,
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&fdt_serial_gaisler
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};
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static struct fdt_serial dummy = {
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35
lib/utils/serial/fdt_serial_gaisler.c
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35
lib/utils/serial/fdt_serial_gaisler.c
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@ -0,0 +1,35 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Cobham Gaisler AB.
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*
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* Authors:
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* Daniel Cederman <cederman@gaisler.com>
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*/
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/serial/fdt_serial.h>
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#include <sbi_utils/serial/gaisler-uart.h>
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static int serial_gaisler_init(void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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int rc;
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struct platform_uart_data uart;
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rc = fdt_parse_gaisler_uart_node(fdt, nodeoff, &uart);
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if (rc)
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return rc;
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return gaisler_uart_init(uart.addr, uart.freq, uart.baud);
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}
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static const struct fdt_match serial_gaisler_match[] = {
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{ .compatible = "gaisler,apbuart" },
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{},
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};
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struct fdt_serial fdt_serial_gaisler = {
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.match_table = serial_gaisler_match,
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.init = serial_gaisler_init
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};
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86
lib/utils/serial/gaisler-uart.c
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86
lib/utils/serial/gaisler-uart.c
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@ -0,0 +1,86 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Cobham Gaisler AB.
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*
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* Authors:
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* Daniel Cederman <cederman@gaisler.com>
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*/
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#include <sbi/riscv_io.h>
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#include <sbi/sbi_console.h>
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#include <sbi_utils/serial/gaisler-uart.h>
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/* clang-format off */
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#define UART_REG_DATA 0
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#define UART_REG_STATUS 1
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#define UART_REG_CTRL 2
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#define UART_REG_SCALER 3
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#define UART_DATA_DATA 0x000000ff
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#define UART_STATUS_FIFOFULL 0x00000200
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#define UART_STATUS_DATAREADY 0x00000001
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#define UART_CTRL_DB (1<<11)
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#define UART_CTRL_FL (1<<6)
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#define UART_CTRL_TE (1<<1)
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#define UART_CTRL_RE (1<<0)
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/* clang-format on */
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static volatile void *uart_base;
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static u32 get_reg(u32 num)
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{
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return readl(uart_base + (num * 0x4));
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}
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static void set_reg(u32 num, u32 val)
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{
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writel(val, uart_base + (num * 0x4));
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}
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static void gaisler_uart_putc(char ch)
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{
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while (get_reg(UART_REG_STATUS) & UART_STATUS_FIFOFULL)
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;
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set_reg(UART_REG_DATA, ch);
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}
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static int gaisler_uart_getc(void)
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{
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u32 ret = get_reg(UART_REG_STATUS);
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if (!(ret & UART_STATUS_DATAREADY))
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return -1;
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return get_reg(UART_REG_DATA) & UART_DATA_DATA;
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}
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static struct sbi_console_device gaisler_console = {
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.name = "gaisler_uart",
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.console_putc = gaisler_uart_putc,
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.console_getc = gaisler_uart_getc
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};
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int gaisler_uart_init(unsigned long base, u32 in_freq, u32 baudrate)
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{
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u32 ctrl;
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uart_base = (volatile void *)base;
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/* Configure baudrate */
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if (in_freq)
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set_reg(UART_REG_SCALER, in_freq / (baudrate * 8 + 7));
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ctrl = get_reg(UART_REG_CTRL);
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/* Preserve debug mode and flow control */
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ctrl &= (UART_CTRL_DB | UART_CTRL_FL);
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/* Enable TX and RX */
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ctrl |= UART_CTRL_TE | UART_CTRL_RE;
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set_reg(UART_REG_CTRL, ctrl);
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sbi_console_set_device(&gaisler_console);
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return 0;
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}
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@ -8,10 +8,12 @@
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#
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libsbiutils-objs-y += serial/fdt_serial.o
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libsbiutils-objs-y += serial/fdt_serial_gaisler.o
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libsbiutils-objs-y += serial/fdt_serial_htif.o
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libsbiutils-objs-y += serial/fdt_serial_shakti.o
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libsbiutils-objs-y += serial/fdt_serial_sifive.o
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libsbiutils-objs-y += serial/fdt_serial_uart8250.o
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libsbiutils-objs-y += serial/gaisler-uart.o
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libsbiutils-objs-y += serial/shakti-uart.o
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libsbiutils-objs-y += serial/sifive-uart.o
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libsbiutils-objs-y += serial/uart8250.o
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