u-boot/arch/riscv/lib/bootm.c
Lukas Auer 90ae281437 riscv: add option to wait for ack from secondary harts in smp functions
Add a wait option to smp_call_function() to wait for the secondary harts
to acknowledge the call-function request. The request is considered to
be acknowledged once each secondary hart has cleared the corresponding
IPI.

As part of the call-function request, the secondary harts invalidate the
instruction cache after clearing the IPI. This adds a delay between
acknowledgment (clear IPI) and fulfillment (call function) of the
request. We want to use the acknowledgment to be able to judge when the
request has been completed. Remove the delay by clearing the IPI after
cache invalidation and just before calling the function from the
request.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Rick Chen <rick@andestech.com>
Tested-by: Rick Chen <rick@andestech.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
2019-12-10 08:23:10 +08:00

137 lines
3 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* 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>
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <dm/root.h>
#include <image.h>
#include <asm/byteorder.h>
#include <asm/csr.h>
#include <asm/smp.h>
#include <dm/device.h>
#include <dm/root.h>
#include <u-boot/zlib.h>
DECLARE_GLOBAL_DATA_PTR;
__weak void board_quiesce_devices(void)
{
}
int arch_fixup_fdt(void *blob)
{
return 0;
}
/**
* announce_and_cleanup() - Print message and prepare for kernel boot
*
* @fake: non-zero to do everything except actually boot
*/
static void announce_and_cleanup(int fake)
{
printf("\nStarting kernel ...%s\n\n", fake ?
"(fake run for tracing)" : "");
bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
#ifdef CONFIG_BOOTSTAGE_FDT
bootstage_fdt_add_report();
#endif
#ifdef CONFIG_BOOTSTAGE_REPORT
bootstage_report();
#endif
#ifdef CONFIG_USB_DEVICE
udc_disconnect();
#endif
board_quiesce_devices();
/*
* Call remove function of all devices with a removal flag set.
* This may be useful for last-stage operations, like cancelling
* of DMA operation or releasing device internal buffers.
*/
dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
cleanup_before_linux();
}
static void boot_prep_linux(bootm_headers_t *images)
{
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 {
printf("Device tree not found or missing FDT support\n");
hang();
}
}
static void boot_jump_linux(bootm_headers_t *images, int flag)
{
void (*kernel)(ulong hart, void *dtb);
int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
#ifdef CONFIG_SMP
int ret;
#endif
kernel = (void (*)(ulong, void *))images->ep;
bootstage_mark(BOOTSTAGE_ID_RUN_OS);
debug("## Transferring control to kernel (at address %08lx) ...\n",
(ulong)kernel);
announce_and_cleanup(fake);
if (!fake) {
if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
#ifdef CONFIG_SMP
ret = smp_call_function(images->ep,
(ulong)images->ft_addr, 0, 0);
if (ret)
hang();
#endif
kernel(gd->arch.boot_hart, images->ft_addr);
}
}
}
int do_bootm_linux(int flag, int argc, char * const argv[],
bootm_headers_t *images)
{
/* No need for those on RISC-V */
if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
return -1;
if (flag & BOOTM_STATE_OS_PREP) {
boot_prep_linux(images);
return 0;
}
if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
boot_jump_linux(images, flag);
return 0;
}
boot_prep_linux(images);
boot_jump_linux(images, flag);
return 0;
}
int do_bootm_vxworks(int flag, int argc, char * const argv[],
bootm_headers_t *images)
{
return do_bootm_linux(flag, argc, argv, images);
}