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https://github.com/riscv-software-src/opensbi.git
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lib: utils: serial: Initial commit of xlnx-uartlite
Initial commit of the xlnx-uartlite device and FDT support. This was tested by running OpenSBI on a modified QEMU virt machine using the xlnx-uartlite for serial. Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Xiang W <wxjstz@126.com> Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:

committed by
Anup Patel

parent
f3f4604c19
commit
4998a712b2
@@ -68,6 +68,9 @@ int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
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int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
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int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
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const char *compatible);
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const char *compatible);
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int fdt_parse_xlnx_uartlite_node(void *fdt, int nodeoffset,
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struct platform_uart_data *uart);
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struct aplic_data;
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struct aplic_data;
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int fdt_parse_aplic_node(void *fdt, int nodeoff, struct aplic_data *aplic);
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int fdt_parse_aplic_node(void *fdt, int nodeoff, struct aplic_data *aplic);
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16
include/sbi_utils/serial/xlnx_uartlite.h
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16
include/sbi_utils/serial/xlnx_uartlite.h
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@@ -0,0 +1,16 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Alistair Francis <alistair.francis@wdc.com>
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*/
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#ifndef __SERIAL_XLNX_UARTLITE_H__
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#define __SERIAL_XLNX_UARTLITE_H__
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#include <sbi/sbi_types.h>
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int xlnx_uartlite_init(unsigned long base);
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#endif
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@@ -467,6 +467,24 @@ int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
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return fdt_parse_uart8250_node(fdt, nodeoffset, uart);
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return fdt_parse_uart8250_node(fdt, nodeoffset, uart);
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}
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}
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int fdt_parse_xlnx_uartlite_node(void *fdt, int nodeoffset,
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struct platform_uart_data *uart)
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{
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int rc;
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uint64_t 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, 0,
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®_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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return 0;
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}
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int fdt_parse_aplic_node(void *fdt, int nodeoff, struct aplic_data *aplic)
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int fdt_parse_aplic_node(void *fdt, int nodeoff, struct aplic_data *aplic)
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{
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{
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bool child_found;
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bool child_found;
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@@ -19,6 +19,7 @@ extern struct fdt_serial fdt_serial_litex;
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extern struct fdt_serial fdt_serial_htif;
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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_shakti;
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extern struct fdt_serial fdt_serial_gaisler;
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extern struct fdt_serial fdt_serial_gaisler;
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extern struct fdt_serial fdt_serial_xlnx_uartlite;
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static struct fdt_serial *serial_drivers[] = {
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static struct fdt_serial *serial_drivers[] = {
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&fdt_serial_uart8250,
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&fdt_serial_uart8250,
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@@ -26,7 +27,8 @@ static struct fdt_serial *serial_drivers[] = {
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&fdt_serial_litex,
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&fdt_serial_litex,
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&fdt_serial_htif,
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&fdt_serial_htif,
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&fdt_serial_shakti,
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&fdt_serial_shakti,
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&fdt_serial_gaisler
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&fdt_serial_gaisler,
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&fdt_serial_xlnx_uartlite,
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};
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};
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static struct fdt_serial dummy = {
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static struct fdt_serial dummy = {
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35
lib/utils/serial/fdt_serial_xlnx_uartlite.c
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35
lib/utils/serial/fdt_serial_xlnx_uartlite.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) 2022 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Alistair Francis <alistair.francis@wdc.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/xlnx_uartlite.h>
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static int serial_xlnx_uartlite_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_xlnx_uartlite_node(fdt, nodeoff, &uart);
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if (rc)
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return rc;
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return xlnx_uartlite_init(uart.addr);
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}
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static const struct fdt_match serial_xlnx_uartlite_match[] = {
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{ .compatible = "xlnx,xps-uartlite-1.00.a" },
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{ },
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};
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struct fdt_serial fdt_serial_xlnx_uartlite = {
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.match_table = serial_xlnx_uartlite_match,
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.init = serial_xlnx_uartlite_init,
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};
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@@ -14,8 +14,10 @@ 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_sifive.o
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libsbiutils-objs-y += serial/fdt_serial_litex.o
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libsbiutils-objs-y += serial/fdt_serial_litex.o
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libsbiutils-objs-y += serial/fdt_serial_uart8250.o
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libsbiutils-objs-y += serial/fdt_serial_uart8250.o
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libsbiutils-objs-y += serial/fdt_serial_xlnx_uartlite.o
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libsbiutils-objs-y += serial/gaisler-uart.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/shakti-uart.o
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libsbiutils-objs-y += serial/sifive-uart.o
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libsbiutils-objs-y += serial/sifive-uart.o
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libsbiutils-objs-y += serial/litex-uart.o
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libsbiutils-objs-y += serial/litex-uart.o
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libsbiutils-objs-y += serial/uart8250.o
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libsbiutils-objs-y += serial/uart8250.o
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libsbiutils-objs-y += serial/xlnx-uartlite.o
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67
lib/utils/serial/xlnx-uartlite.c
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67
lib/utils/serial/xlnx-uartlite.c
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@@ -0,0 +1,67 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Alistair Francis <alistair.francis@wdc.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/xlnx_uartlite.h>
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/* clang-format off */
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#define UART_RX_OFFSET 0x00
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#define UART_TX_OFFSET 0x04
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#define UART_STATUS_OFFSET 0x08
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# define UART_STATUS_RXVALID 0x01
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# define UART_STATUS_RXFULL 0x02
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# define UART_STATUS_TXEMPTY 0x04
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# define UART_STATUS_TXFULL 0x08
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# define UART_STATUS_IE 0x10
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# define UART_STATUS_OVERRUN 0x20
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# define UART_STATUS_FRAME 0x40
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# define UART_STATUS_PARITY 0x80
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#define UART_CTRL_OFFSET 0x0C
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# define UART_CTRL_RST_TX 0x01
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# define UART_CTRL_RST_RX 0x02
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# define UART_CTRL_IE 0x10
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/* clang-format on */
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static volatile char *xlnx_uartlite_base;
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static void xlnx_uartlite_putc(char ch)
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{
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while((readb(xlnx_uartlite_base + UART_STATUS_OFFSET) & UART_STATUS_TXFULL))
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;
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writeb(ch, xlnx_uartlite_base + UART_TX_OFFSET);
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}
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static int xlnx_uartlite_getc(void)
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{
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u16 status = readb(xlnx_uartlite_base + UART_STATUS_OFFSET);
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if (status & UART_STATUS_RXVALID)
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return readb(xlnx_uartlite_base + UART_RX_OFFSET);
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return -1;
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}
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static struct sbi_console_device xlnx_uartlite_console = {
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.name = "xlnx-uartlite",
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.console_putc = xlnx_uartlite_putc,
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.console_getc = xlnx_uartlite_getc
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};
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int xlnx_uartlite_init(unsigned long base)
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{
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xlnx_uartlite_base = (volatile char *)base;
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sbi_console_set_device(&xlnx_uartlite_console);
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return 0;
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}
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