LiteX is a Migen-based System on Chip, supporting softcore VexRiscv CPU, a 32-bits Linux Capable RISC-V CPU.
See https://github.com/enjoy-digital/litex and https://github.com/litex-hub/linux-on-litex-vexriscv for details. Signed-off-by: Antony Pavlov <antonynpav...@gmail.com> --- arch/riscv/Kconfig | 9 ++ arch/riscv/Makefile | 1 + arch/riscv/dts/litex_soc_linux.dtsi | 49 +++++++ arch/riscv/mach-litex/Kconfig | 8 ++ arch/riscv/mach-litex/Makefile | 3 + arch/riscv/mach-litex/include/mach/debug_ll.h | 124 ++++++++++++++++++ 6 files changed, 194 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c0583f3153..40dfd7dd93 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -34,6 +34,14 @@ config MACH_ERIZO select RISCV_M_MODE select RISCV_TIMER +config MACH_LITEX + bool "litex family" + select ARCH_RV32I + select HAS_DEBUG_LL + select HAS_NMON + select USE_COMPRESSED_DTB + select RISCV_SBI + config MACH_VIRT bool "virt family" select BOARD_RISCV_GENERIC_DT @@ -83,6 +91,7 @@ config 64BIT select PHYS_ADDR_T_64BIT source "arch/riscv/mach-erizo/Kconfig" +source "arch/riscv/mach-litex/Kconfig" config BOARD_RISCV_GENERIC_DT select BOARD_GENERIC_DT diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index aba4526bba..bc22786368 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -20,6 +20,7 @@ cflags-y += $(riscv-cflags-y) LDFLAGS_barebox += -nostdlib machine-$(CONFIG_MACH_ERIZO) := erizo +machine-$(CONFIG_MACH_LITEX) := litex machine-$(CONFIG_MACH_VIRT) := virt LDFLAGS_barebox += $(riscv-ldflags-y) diff --git a/arch/riscv/dts/litex_soc_linux.dtsi b/arch/riscv/dts/litex_soc_linux.dtsi new file mode 100644 index 0000000000..32382b8dc2 --- /dev/null +++ b/arch/riscv/dts/litex_soc_linux.dtsi @@ -0,0 +1,49 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/dts-v1/; + +/ { + compatible = "litex,vexriscv-soc-linux"; + + #address-cells = <1>; + #size-cells = <1>; + + cpus { + #address-cells = <1>; + #size-cells = <0>; + + timebase-frequency = <100000000>; // 100 MHz + + cpu@0 { + device_type = "cpu"; + compatible = "spinalhdl,vexriscv", "riscv"; + reg = <0>; + }; + }; + + uart0: serial@f0001000 { + compatible = "litex,uart"; + reg = <0xf0001000 0x18>; + status = "disabled"; + }; + + mac0: mac@f0009000 { + compatible = "litex,liteeth"; + reg = <0xf0009000 0x7c /* base */ + 0xf0009800 0x0a /* mdio_base */ + 0xb0000000 0x2000>; /* buf_base */ + tx-fifo-depth = <2>; + rx-fifo-depth = <2>; + status = "disabled"; + }; + + spi0: spi@f000b800 { + compatible = "litex,spiflash"; + + #address-cells = <1>; + #size-cells = <0>; + + reg = <0xf000b800 0x100>; + status = "disabled"; + }; +}; diff --git a/arch/riscv/mach-litex/Kconfig b/arch/riscv/mach-litex/Kconfig new file mode 100644 index 0000000000..19d5927e44 --- /dev/null +++ b/arch/riscv/mach-litex/Kconfig @@ -0,0 +1,8 @@ +if MACH_LITEX + +choice + prompt "Board type" + +endchoice + +endif diff --git a/arch/riscv/mach-litex/Makefile b/arch/riscv/mach-litex/Makefile new file mode 100644 index 0000000000..d9c51e74c3 --- /dev/null +++ b/arch/riscv/mach-litex/Makefile @@ -0,0 +1,3 @@ +# just to build a built-in.o. Otherwise compilation fails when no o-files is +# created. +obj- += dummy.o diff --git a/arch/riscv/mach-litex/include/mach/debug_ll.h b/arch/riscv/mach-litex/include/mach/debug_ll.h new file mode 100644 index 0000000000..df7032716d --- /dev/null +++ b/arch/riscv/mach-litex/include/mach/debug_ll.h @@ -0,0 +1,124 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2019 Antony Pavlov <antonynpav...@gmail.com> + * + * This file is part of barebox. + * + * 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. + * + */ + +#ifndef __MACH_LITEX_DEBUG_LL__ +#define __MACH_LITEX_DEBUG_LL__ + +/** @file + * This File contains declaration for early output support + */ + +#include <linux/kconfig.h> + +#define DEBUG_LL_UART_ADDR 0xf0001000 +#define UART_RXTX 0x00 +#define UART_TXFULL 0x04 +#define UART_RXEMPTY 0x08 +#define UART_EV_PENDING 0x10 +#define UART_EV_RX (1 << 1) +#define UART_EV_ENABLE 0x14 + + +#ifndef __ASSEMBLY__ + +/* + * C macros + */ + +#include <asm/io.h> + +static inline void PUTC_LL(char ch) +{ +#ifdef CONFIG_DEBUG_LL + /* wait for space */ + while (__raw_readb((u8 *)DEBUG_LL_UART_ADDR + UART_TXFULL)) + ; + + __raw_writeb(ch, (u8 *)DEBUG_LL_UART_ADDR + UART_RXTX); +#endif /* CONFIG_DEBUG_LL */ +} +#else /* __ASSEMBLY__ */ +/* + * Macros for use in assembly language code + */ + +/* + * output a character in a0 + */ +.macro debug_ll_outc_a0 +#ifdef CONFIG_DEBUG_LL + + li t0, DEBUG_LL_UART_ADDR + +201: + lbu t1, UART_TXFULL(t0) /* uart tx full ? */ + andi t1, t1, 0xff + bnez t1, 201b /* try again */ + + sb a0, UART_RXTX(t0) /* write the character */ + +#endif /* CONFIG_DEBUG_LL */ +.endm + +/* + * output a character + */ +.macro debug_ll_outc chr +#ifdef CONFIG_DEBUG_LL + li a0, \chr + debug_ll_outc_a0 +#endif /* CONFIG_DEBUG_LL */ +.endm + +/* + * check character in input buffer + * return value: + * v0 = 0 no character in input buffer + * v0 != 0 character in input buffer + */ +.macro debug_ll_tstc +#ifdef CONFIG_DEBUG_LL + li t0, DEBUG_LL_UART_ADDR + + /* get line status and check for data present */ + lbu s0, UART_RXEMPTY(t0) + bnez s0, 243f + li s0, 1 + j 244f +243: li s0, 0 +244: nop +#endif /* CONFIG_DEBUG_LL */ +.endm + +/* + * get character to v0 + */ +.macro debug_ll_getc +#ifdef CONFIG_DEBUG_LL + +204: + debug_ll_tstc + + /* try again */ + beqz s0, 204b + + /* read a character */ + lb s0, UART_RXTX(t0) + li t1, UART_EV_RX + sb t1, UART_EV_PENDING(t0) + +#endif /* CONFIG_DEBUG_LL */ +.endm +#endif /* __ASSEMBLY__ */ + +#endif /* __MACH_LITEX_DEBUG_LL__ */ -- 2.31.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox
