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 for details. Signed-off-by: Antony Pavlov <antonynpav...@gmail.com> --- arch/riscv/Kconfig | 6 + arch/riscv/Makefile | 1 + arch/riscv/dts/litex-generic.dts | 17 +++ arch/riscv/dts/litex.dtsi | 36 +++++ arch/riscv/mach-litex/Kconfig | 11 ++ arch/riscv/mach-litex/Makefile | 3 + arch/riscv/mach-litex/include/mach/debug_ll.h | 124 ++++++++++++++++++ 7 files changed, 198 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 16c3eecce6..ca764d54d0 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -24,6 +24,11 @@ config MACH_ERIZO select HAS_DEBUG_LL select HAS_NMON +config MACH_LITEX + bool "litex family" + select HAS_DEBUG_LL + select HAS_NMON + endchoice choice @@ -63,6 +68,7 @@ config BUILTIN_DTB_NAME depends on BUILTIN_DTB source "arch/riscv/mach-erizo/Kconfig" +source "arch/riscv/mach-litex/Kconfig" endmenu diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 643c0bc8eb..955a10cecb 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -12,6 +12,7 @@ LDFLAGS += $(ldflags-y) LDFLAGS_barebox += -nostdlib machine-$(CONFIG_MACH_ERIZO) := erizo +machine-$(CONFIG_MACH_LITEX) := litex TEXT_BASE = $(CONFIG_TEXT_BASE) CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE) diff --git a/arch/riscv/dts/litex-generic.dts b/arch/riscv/dts/litex-generic.dts new file mode 100644 index 0000000000..7dc0fa6c79 --- /dev/null +++ b/arch/riscv/dts/litex-generic.dts @@ -0,0 +1,17 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include "litex.dtsi" + +/ { + model = "LiteX VexRiscV"; + compatible = "litex,vexriscv"; + + memory@40000000 { + device_type = "memory"; + reg = <0x40000000 0x00800000>; + }; +}; + +&uart0 { + status = "okay"; +}; diff --git a/arch/riscv/dts/litex.dtsi b/arch/riscv/dts/litex.dtsi new file mode 100644 index 0000000000..dfd3d83404 --- /dev/null +++ b/arch/riscv/dts/litex.dtsi @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/dts-v1/; + +/ { + compatible = "litex,vexriscv", "litex-dev"; + + #address-cells = <1>; + #size-cells = <1>; + + clocks { + ref_clk: ref_clk { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <50000000>; + }; + }; + + cpus { + #address-cells = <1>; + #size-cells = <0>; + + cpu@0 { + device_type = "cpu"; + compatible = "spinalhdl,vexriscv", "riscv"; + clocks = <&ref_clk>; + reg = <0>; + }; + }; + + uart0: serial@e0001800 { + compatible = "litex,uart"; + reg = <0xe0001800 0x18>; + status = "disabled"; + }; +}; diff --git a/arch/riscv/mach-litex/Kconfig b/arch/riscv/mach-litex/Kconfig new file mode 100644 index 0000000000..ab6cd2fa01 --- /dev/null +++ b/arch/riscv/mach-litex/Kconfig @@ -0,0 +1,11 @@ +if MACH_LITEX + +choice + prompt "Board type" + +config BOARD_LITEX_GENERIC + bool "litex generic board" + +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..aaf9f0b855 --- /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 0xe0001800 +#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__ */ -- 2.20.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox
