From: Rick Chen rick@andestech.com
Add makefile, interrupts.c and boot.c,... functions to support RISC-V arch.
Signed-off-by: Rick Chen rick@andestech.com Signed-off-by: Rick Chen rickchen36@gmail.com Signed-off-by: Greentime Hu green.hu@gmail.com Cc: Padmarao Begari Padmarao.Begari@microsemi.com --- arch/riscv/lib/Makefile | 14 +++ arch/riscv/lib/boot.c | 19 ++++ arch/riscv/lib/bootm.c | 248 +++++++++++++++++++++++++++++++++++++++++++ arch/riscv/lib/cache.c | 50 +++++++++ arch/riscv/lib/interrupts.c | 76 +++++++++++++ 5 files changed, 407 insertions(+), 0 deletions(-) create mode 100644 arch/riscv/lib/Makefile create mode 100644 arch/riscv/lib/boot.c create mode 100644 arch/riscv/lib/bootm.c create mode 100644 arch/riscv/lib/cache.c create mode 100644 arch/riscv/lib/interrupts.c
diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile new file mode 100644 index 0000000..323cf3e --- /dev/null +++ b/arch/riscv/lib/Makefile @@ -0,0 +1,14 @@ +# +# (C) Copyright 2000-2006 +# Wolfgang Denk, DENX Software Engineering, wd@denx.de. +# +# Copyright (C) 2017 Andes Technology Corporation +# Rick Chen, Andes Technology Corporation rick@andestech.com +# +# SPDX-License-Identifier: GPL-2.0+ +# + +obj-$(CONFIG_CMD_BOOTM) += bootm.o +obj-$(CONFIG_CMD_GO) += boot.o +obj-y += cache.o +obj-y += interrupts.o diff --git a/arch/riscv/lib/boot.c b/arch/riscv/lib/boot.c new file mode 100644 index 0000000..39ba9b4 --- /dev/null +++ b/arch/riscv/lib/boot.c @@ -0,0 +1,19 @@ +/* + * Copyright (C) 2017 Andes Technology Corporation + * Rick Chen, Andes Technology Corporation rick@andestech.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <command.h> + +DECLARE_GLOBAL_DATA_PTR; + +unsigned long do_go_exec(ulong (*entry)(int, char * const []), + int argc, char * const argv[]) +{ + cleanup_before_linux(); + + return entry(argc, argv); +} diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c new file mode 100644 index 0000000..44ce38b --- /dev/null +++ b/arch/riscv/lib/bootm.c @@ -0,0 +1,248 @@ +/* + * Copyright (C) 2011 Andes Technology Corporation + * Shawn Lin, Andes Technology Corporation nobuhiro@andestech.com + * Macpaul Lin, Andes Technology Corporation macpaul@andestech.com + * Rick Chen, Andes Technology Corporation rick@andestech.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <command.h> +#include <image.h> +#include <u-boot/zlib.h> +#include <asm/byteorder.h> +#include <asm/bootm.h> + +DECLARE_GLOBAL_DATA_PTR; + +int arch_fixup_fdt(void *blob) +{ + return 0; +} + +#if defined(CONFIG_SETUP_MEMORY_TAGS) || \ + defined(CONFIG_CMDLINE_TAG) || \ + defined(CONFIG_INITRD_TAG) || \ + defined(CONFIG_SERIAL_TAG) || \ + defined(CONFIG_REVISION_TAG) +static void setup_start_tag(bd_t *bd); + +# ifdef CONFIG_SETUP_MEMORY_TAGS +static void setup_memory_tags(bd_t *bd); +# endif +static void setup_commandline_tag(bd_t *bd, char *commandline); + +# ifdef CONFIG_INITRD_TAG +static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end); +# endif +static void setup_end_tag(bd_t *bd); + +static struct tag *params; +#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */ + +int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) +{ + bd_t *bd = gd->bd; + char *s; + int machid = bd->bi_arch_number; + void (*theKernel)(int zero, int arch, uint params); + +#ifdef CONFIG_CMDLINE_TAG + char *commandline = env_get("bootargs"); +#endif + + /* + * allow the PREP bootm subcommand, it is required for bootm to work + */ + if (flag & BOOTM_STATE_OS_PREP) + return 0; + + if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) + return 1; + + theKernel = (void (*)(int, int, uint))images->ep; + + s = env_get("machid"); + if (s) { + machid = simple_strtoul(s, NULL, 16); + printf("Using machid 0x%x from environment\n", machid); + } + + bootstage_mark(BOOTSTAGE_ID_RUN_OS); + + debug("## Transferring control to Linux (at address %08lx) ...\n", + (ulong)theKernel); + + if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { +#ifdef CONFIG_OF_LIBFDT + debug("using: FDT\n"); + if (image_setup_linux(images)) { + printf("FDT creation failed! hanging..."); + hang(); + } +#endif + } else if (BOOTM_ENABLE_TAGS) { +#if defined(CONFIG_SETUP_MEMORY_TAGS) || \ + defined(CONFIG_CMDLINE_TAG) || \ + defined(CONFIG_INITRD_TAG) || \ + defined(CONFIG_SERIAL_TAG) || \ + defined(CONFIG_REVISION_TAG) + setup_start_tag(bd); +#ifdef CONFIG_SERIAL_TAG + setup_serial_tag(¶ms); +#endif +#ifdef CONFIG_REVISION_TAG + setup_revision_tag(¶ms); +#endif +#ifdef CONFIG_SETUP_MEMORY_TAGS + setup_memory_tags(bd); +#endif +#ifdef CONFIG_CMDLINE_TAG + setup_commandline_tag(bd, commandline); +#endif +#ifdef CONFIG_INITRD_TAG + if (images->rd_start && images->rd_end) + setup_initrd_tag(bd, images->rd_start, images->rd_end); +#endif + setup_end_tag(bd); +#endif + + /* we assume that the kernel is in place */ + printf("\nStarting kernel ...\n\n"); + +#ifdef CONFIG_USB_DEVICE + { + extern void udc_disconnect(void); + udc_disconnect(); + } +#endif + } + cleanup_before_linux(); + if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) + theKernel(0, machid, (unsigned long)images->ft_addr); + else + theKernel(0, machid, bd->bi_boot_params); + /* does not return */ + + return 1; +} + +#if defined(CONFIG_SETUP_MEMORY_TAGS) || \ + defined(CONFIG_CMDLINE_TAG) || \ + defined(CONFIG_INITRD_TAG) || \ + defined(CONFIG_SERIAL_TAG) || \ + defined(CONFIG_REVISION_TAG) +static void setup_start_tag(bd_t *bd) +{ + params = (struct tag *)bd->bi_boot_params; + + params->hdr.tag = ATAG_CORE; + params->hdr.size = tag_size(tag_core); + + params->u.core.flags = 0; + params->u.core.pagesize = 0; + params->u.core.rootdev = 0; + + params = tag_next(params); +} + +#ifdef CONFIG_SETUP_MEMORY_TAGS +static void setup_memory_tags(bd_t *bd) +{ + int i; + + for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { + params->hdr.tag = ATAG_MEM; + params->hdr.size = tag_size(tag_mem32); + + params->u.mem.start = bd->bi_dram[i].start; + params->u.mem.size = bd->bi_dram[i].size; + + params = tag_next(params); + } +} +#endif /* CONFIG_SETUP_MEMORY_TAGS */ + +static void setup_commandline_tag(bd_t *bd, char *commandline) +{ + char *p; + + if (!commandline) + return; + + /* eat leading white space */ + for (p = commandline; *p == ' '; p++) + ; + + /* skip non-existent command lines so the kernel will still + * use its default command line. + */ + if (*p == '\0') + return; + + params->hdr.tag = ATAG_CMDLINE; + params->hdr.size = + (sizeof(struct tag_header) + strlen(p) + 1 + 4) >> 2; + + strcpy(params->u.cmdline.cmdline, p) + ; + + params = tag_next(params); +} + +#ifdef CONFIG_INITRD_TAG +static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end) +{ + /* an ATAG_INITRD node tells the kernel where the compressed + * ramdisk can be found. ATAG_RDIMG is a better name, actually. + */ + params->hdr.tag = ATAG_INITRD2; + params->hdr.size = tag_size(tag_initrd); + + params->u.initrd.start = initrd_start; + params->u.initrd.size = initrd_end - initrd_start; + + params = tag_next(params); +} +#endif /* CONFIG_INITRD_TAG */ + +#ifdef CONFIG_SERIAL_TAG +void setup_serial_tag(struct tag **tmp) +{ + struct tag *params; + struct tag_serialnr serialnr; + void get_board_serial(struct tag_serialnr *serialnr); + + params = *tmp; + get_board_serial(&serialnr); + params->hdr.tag = ATAG_SERIAL; + params->hdr.size = tag_size(tag_serialnr); + params->u.serialnr.low = serialnr.low; + params->u.serialnr.high = serialnr.high; + params = tag_next(params); + *tmp = params; +} +#endif + +#ifdef CONFIG_REVISION_TAG +void setup_revision_tag(struct tag **in_params) +{ + u32 rev; + u32 get_board_rev(void); + + rev = get_board_rev(); + params->hdr.tag = ATAG_REVISION; + params->hdr.size = tag_size(tag_revision); + params->u.revision.rev = rev; + params = tag_next(params); +} +#endif /* CONFIG_REVISION_TAG */ + +static void setup_end_tag(bd_t *bd) +{ + params->hdr.tag = ATAG_NONE; + params->hdr.size = 0; +} + +#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */ diff --git a/arch/riscv/lib/cache.c b/arch/riscv/lib/cache.c new file mode 100644 index 0000000..948656f --- /dev/null +++ b/arch/riscv/lib/cache.c @@ -0,0 +1,50 @@ +/* + * Copyright (C) 2017 Andes Technology Corporation + * Rick Chen, Andes Technology Corporation rick@andestech.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> + +void flush_dcache_range(unsigned long start, unsigned long end) +{ +} + +void invalidate_icache_range(unsigned long start, unsigned long end) +{ +} + +void invalidate_dcache_range(unsigned long start, unsigned long end) +{ +} + +void flush_cache(unsigned long addr, unsigned long size) +{ +} + +void icache_enable(void) +{ +} + +void icache_disable(void) +{ +} + +int icache_status(void) +{ + return 0; +} + +void dcache_enable(void) +{ +} + +void dcache_disable(void) +{ +} + +int dcache_status(void) +{ + return 0; +} diff --git a/arch/riscv/lib/interrupts.c b/arch/riscv/lib/interrupts.c new file mode 100644 index 0000000..075db8b --- /dev/null +++ b/arch/riscv/lib/interrupts.c @@ -0,0 +1,76 @@ +/* + * Copyright (c) 2016-17 Microsemi Corporation. + * Padmarao Begari, Microsemi Corporation padmarao.begari@microsemi.com + * + * Copyright (C) 2017 Andes Technology Corporation + * Rick Chen, Andes Technology Corporation rick@andestech.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/ptrace.h> +#include <asm/system.h> +#include <asm/encoding.h> + +static void _exit_trap(int code, uint epc, struct pt_regs *regs); + +int interrupt_init(void) +{ + return 0; +} + +/* + * enable interrupts + */ +void enable_interrupts(void) +{ +} + +/* + * disable interrupts + */ +int disable_interrupts(void) +{ + return 0; +} + +uint handle_trap(uint mcause, uint epc, struct pt_regs *regs) +{ + uint is_int; + + is_int = (mcause & MCAUSE_INT); + if ((is_int) && ((mcause & MCAUSE_CAUSE) == IRQ_M_EXT)) + external_interrupt(0); /* handle_m_ext_interrupt */ + else if ((is_int) && ((mcause & MCAUSE_CAUSE) == IRQ_M_TIMER)) + timer_interrupt(0); /* handle_m_timer_interrupt */ + else + _exit_trap(mcause, epc, regs); + + return epc; +} + +/* + *Entry Point for PLIC Interrupt Handler + */ +__attribute__((weak)) void external_interrupt(struct pt_regs *regs) +{ +} + +__attribute__((weak)) void timer_interrupt(struct pt_regs *regs) +{ +} + +static void _exit_trap(int code, uint epc, struct pt_regs *regs) +{ + static const char *exception_code[] = { + "Instruction address misaligned", + "Instruction access fault", + "Illegal instruction", + "Breakpoint", + "Load address misaligned" + }; + + printf("exception code: %d , %s , epc %08x , ra %08lx\n", + code, exception_code[code], epc, regs->ra); +}