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 <[email protected]> --- arch/riscv/Kconfig.socs | 14 +++ arch/riscv/boards/Makefile | 1 + arch/riscv/boards/litex-linux/Makefile | 3 + arch/riscv/boards/litex-linux/lowlevel.c | 22 ++++ arch/riscv/dts/Makefile | 1 + arch/riscv/dts/litex-linux.dts | 92 +++++++++++++++++ arch/riscv/dts/litex_soc_linux.dtsi | 49 +++++++++ arch/riscv/include/asm/debug_ll.h | 3 + arch/riscv/include/asm/debug_ll_litex.h | 123 +++++++++++++++++++++++ common/Kconfig | 4 + images/Makefile.riscv | 4 + 11 files changed, 316 insertions(+) diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs index 67d19caeb3..3ae66776f0 100644 --- a/arch/riscv/Kconfig.socs +++ b/arch/riscv/Kconfig.socs @@ -42,4 +42,18 @@ config BOARD_HIFIVE endif +config SOC_LITEX + bool "LiteX SoCs" + depends on ARCH_RV32I + select HAS_ASM_DEBUG_LL + select HAS_NMON + select USE_COMPRESSED_DTB + select RISCV_TIMER + +config BOARD_LITEX_LINUX + bool "litex linux board" + depends on SOC_LITEX + select RISCV_M_MODE + def_bool y + endmenu diff --git a/arch/riscv/boards/Makefile b/arch/riscv/boards/Makefile index 99f22f32b4..0468871fde 100644 --- a/arch/riscv/boards/Makefile +++ b/arch/riscv/boards/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_BOARD_ERIZO_GENERIC) += erizo/ obj-$(CONFIG_BOARD_HIFIVE) += hifive/ +obj-$(CONFIG_BOARD_LITEX_LINUX) += litex-linux/ diff --git a/arch/riscv/boards/litex-linux/Makefile b/arch/riscv/boards/litex-linux/Makefile new file mode 100644 index 0000000000..3d217ffe0b --- /dev/null +++ b/arch/riscv/boards/litex-linux/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +pbl-y += lowlevel.o diff --git a/arch/riscv/boards/litex-linux/lowlevel.c b/arch/riscv/boards/litex-linux/lowlevel.c new file mode 100644 index 0000000000..da23ef5633 --- /dev/null +++ b/arch/riscv/boards/litex-linux/lowlevel.c @@ -0,0 +1,22 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <common.h> +#include <asm/barebox-riscv.h> +#include <debug_ll.h> +#include <asm/riscv_nmon.h> + +ENTRY_FUNCTION(start_litex_linux, a0, a1, a2) +{ + extern char __dtb_z_litex_linux_start[]; + void *fdt; + + barebox_nmon_entry(); + + putc_ll('>'); + + /* On POR, we are running from read-only memory here. */ + + fdt = __dtb_z_litex_linux_start + get_runtime_offset(); + + barebox_riscv_machine_entry(0x40000000, SZ_256M, fdt); +} diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile index 17fdc9445b..683038189f 100644 --- a/arch/riscv/dts/Makefile +++ b/arch/riscv/dts/Makefile @@ -7,5 +7,6 @@ obj- += dummy.o pbl-$(CONFIG_BOARD_ERIZO_GENERIC) += erizo-generic.dtb.o pbl-$(CONFIG_BOARD_HIFIVE) += hifive-unmatched-a00.dtb.o \ hifive-unleashed-a00.dtb.o +pbl-$(CONFIG_BOARD_LITEX_LINUX) += litex-linux.dtb.o clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts diff --git a/arch/riscv/dts/litex-linux.dts b/arch/riscv/dts/litex-linux.dts new file mode 100644 index 0000000000..d21fa57e30 --- /dev/null +++ b/arch/riscv/dts/litex-linux.dts @@ -0,0 +1,92 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include "litex_soc_linux.dtsi" + +#include <dt-bindings/gpio/gpio.h> + +/ { + model = "LiteX VexRiscV-SoC-Linux"; + compatible = "litex,vexriscv-soc-linux"; + + aliases { + rom = &rom; + sram = &sram; + }; + + /* ARTY board */ + rom: rom@00000000 { + compatible = "mmio-sram"; + reg = <0x00000000 0x00008000>; + read-only; + }; + + sram: sram@20000000 { + compatible = "mmio-sram"; + reg = <0x20000000 0x00004000>; + }; + + main_ram: memory@40000000 { + device_type = "memory"; + reg = <0x40000000 0x10000000>; + }; +}; + +&uart0 { + status = "okay"; +}; + +&mac0 { + status = "okay"; +}; + +&spi0 { + status = "okay"; + + spiflash: w25q128@0 { + #address-cells = <1>; + #size-cells = <1>; + compatible = "winbond,w25q128", "jedec,spi-nor"; + spi-max-frequency = <104000000>; + reg = <0>; + }; +}; + +/ { + ledsgpio: gpio@f000a800 { + compatible = "ti,74175"; + reg = <0xf000a800 0x4>; + gpio-controller; + #gpio-cells = <2>; + }; + + leds { + compatible = "gpio-leds"; + + ld0 { + label = "arty:green:ld0"; + gpios = <&ledsgpio 0 GPIO_ACTIVE_HIGH>; + }; + + ld1 { + label = "arty:green:ld1"; + gpios = <&ledsgpio 1 GPIO_ACTIVE_HIGH>; + }; + + ld2 { + label = "arty:green:ld2"; + gpios = <&ledsgpio 2 GPIO_ACTIVE_HIGH>; + }; + + ld3 { + label = "arty:green:ld3"; + gpios = <&ledsgpio 3 GPIO_ACTIVE_HIGH>; + }; + }; + + swgpio: gpio@f0006000 { + compatible = "ti,74125"; + reg = <0xf0006000 0x4>; + gpio-controller; + #gpio-cells = <2>; + }; +}; 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/include/asm/debug_ll.h b/arch/riscv/include/asm/debug_ll.h index 6904460af9..050a1412d1 100644 --- a/arch/riscv/include/asm/debug_ll.h +++ b/arch/riscv/include/asm/debug_ll.h @@ -37,6 +37,9 @@ static inline void PUTC_LL(char ch) writel(ch, uart0); } +#elif defined CONFIG_DEBUG_LITEX + +#include <asm/debug_ll_litex.h> #endif diff --git a/arch/riscv/include/asm/debug_ll_litex.h b/arch/riscv/include/asm/debug_ll_litex.h new file mode 100644 index 0000000000..2fcdd9b0ec --- /dev/null +++ b/arch/riscv/include/asm/debug_ll_litex.h @@ -0,0 +1,123 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2019 Antony Pavlov <[email protected]> + * + * 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 __ASM_DEBUG_LL_LITEX__ +#define __ASM_DEBUG_LL_LITEX__ + +/** @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) + + +#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 /* __ASM_DEBUG_LL_LITEX__ */ diff --git a/common/Kconfig b/common/Kconfig index db7cc6713a..cd61b0ef6c 100644 --- a/common/Kconfig +++ b/common/Kconfig @@ -1379,6 +1379,10 @@ config DEBUG_SIFIVE bool "SiFive serial0 port" depends on SOC_SIFIVE +config DEBUG_LITEX + bool "LiteX serial port" + depends on SOC_LITEX + endchoice config DEBUG_IMX_UART_PORT diff --git a/images/Makefile.riscv b/images/Makefile.riscv index c44c683431..24e33f5b11 100644 --- a/images/Makefile.riscv +++ b/images/Makefile.riscv @@ -15,3 +15,7 @@ pblb-$(CONFIG_BOARD_HIFIVE) += start_hifive_unmatched start_hifive_unleashed FILE_barebox-hifive-unmatched.img = start_hifive_unmatched.pblb FILE_barebox-hifive-unleashed.img = start_hifive_unleashed.pblb image-$(CONFIG_BOARD_HIFIVE) += barebox-hifive-unmatched.img barebox-hifive-unleashed.img + +pblb-$(CONFIG_BOARD_LITEX_LINUX) += start_litex_linux +FILE_barebox-litex-linux.img = start_litex_linux.pblb +image-$(CONFIG_BOARD_LITEX_LINUX) += barebox-litex-linux.img -- 2.31.1 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
