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riscv: nx25: lib: Add relative lib funcs to support RISC-V

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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>
This commit is contained in:
Rick Chen 2017-12-26 13:55:49 +08:00 committed by Tom Rini
parent e8e39597a3
commit 8bbb2909cb
5 changed files with 407 additions and 0 deletions
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14
arch/riscv/lib/Makefile Normal file
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#
# (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

19
arch/riscv/lib/boot.c Normal file
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/*
* 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);
}

248
arch/riscv/lib/bootm.c Normal file
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/*
* 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(&params);
#endif
#ifdef CONFIG_REVISION_TAG
setup_revision_tag(&params);
#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 */

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arch/riscv/lib/cache.c Normal file
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/*
* 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;
}

76
arch/riscv/lib/interrupts.c Normal file
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/*
* 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);
}