arm64: remove spin table support

As ARM Trusted Firmware is the only first class citizen for
booting arm64 multi-processor in coreboot remove spintable
support. If SoCs want to bring up MP then ATF needs to be
ported and integrated.

Change-Id: I1f38b8d8b0952eee50cc64440bfd010b1dd0bff4
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11908
Tested-by: build bot (Jenkins)
Reviewed-by: Julius Werner <jwerner@chromium.org>

6 files changed, 0 insertions, 186 deletions

diff --git a/src/arch/arm64/Kconfig b/src/arch/arm64/Kconfig
index 2f019a34be..2c8713224c 100644
--- a/src/arch/arm64/Kconfig
+++ b/src/arch/arm64/Kconfig
@@ -28,11 +28,6 @@ config ARM64_BOOTBLOCK_CUSTOM
 	bool
 	default n
 
-config ARM64_USE_SPINTABLE
-	bool
-	default n
-	depends on ARCH_RAMSTAGE_ARM64
-
 config ARM64_USE_ARM_TRUSTED_FIRMWARE
 	bool
 	default n
diff --git a/src/arch/arm64/Makefile.inc b/src/arch/arm64/Makefile.inc
index e82e8720be..fabe7b3241 100644
--- a/src/arch/arm64/Makefile.inc
+++ b/src/arch/arm64/Makefile.inc
@@ -142,7 +142,6 @@ ramstage-y += memcpy.S
 ramstage-y += memmove.S
 ramstage-y += stage_entry.S
 ramstage-y += cpu-stubs.c
-ramstage-$(CONFIG_ARM64_USE_SPINTABLE) += spintable.c spintable_asm.S
 ramstage-$(CONFIG_ARM64_USE_ARM_TRUSTED_FIRMWARE) += arm_tf.c
 ramstage-y += transition.c transition_asm.S
 
diff --git a/src/arch/arm64/boot.c b/src/arch/arm64/boot.c
index 6076e67065..10d72576d9 100644
--- a/src/arch/arm64/boot.c
+++ b/src/arch/arm64/boot.c
@@ -16,7 +16,6 @@
 #include <arch/cache.h>
 #include <arch/lib_helpers.h>
 #include <arch/stages.h>
-#include <arch/spintable.h>
 #include <arch/transition.h>
 #include <arm_tf.h>
 #include <cbmem.h>
@@ -39,10 +38,6 @@ static void run_payload(struct prog *prog)
 	else {
 		uint8_t current_el = get_current_el();
 
-		/* Start the other CPUs spinning. */
-		if (IS_ENABLED(CONFIG_ARM64_USE_SPINTABLE))
-			spintable_start();
-
 		cache_sync_instructions();
 
 		printk(BIOS_SPEW, "entry    = %p\n", doit);
diff --git a/src/arch/arm64/include/arch/spintable.h b/src/arch/arm64/include/arch/spintable.h
deleted file mode 100644
index 598090ac60..0000000000
--- a/src/arch/arm64/include/arch/spintable.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright 2014 Google, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * 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 __ARCH_SPINTABLE_H__
-#define __ARCH_SPINTABLE_H__
-
-struct spintable_attributes {
-	void (*entry)(void *);
-	void *addr;
-};
-
-#if IS_ENABLED(CONFIG_ARM64_USE_SPINTABLE)
-
-/* Initialize spintable with provided monitor address. */
-void spintable_init(void *monitor_address);
-
-/* Return NULL on failure, otherwise the spintable info. */
-const struct spintable_attributes *spintable_get_attributes(void);
-
-#else /* IS_ENABLED(CONFIG_ARM64_USE_SPINTABLE) */
-
-static inline void spintable_init(void *monitor_address) {}
-static inline const struct spintable_attributes *spintable_get_attributes(void)
-{
-	return NULL;
-}
-
-#endif /* IS_ENABLED(CONFIG_ARM64_USE_SPINTABLE) */
-
-/* Start spinning on the non-boot CPUs. */
-void spintable_start(void);
-
-#endif /* __ARCH_SPINTABLE_H__ */
diff --git a/src/arch/arm64/spintable.c b/src/arch/arm64/spintable.c
deleted file mode 100644
index 83b2207cf2..0000000000
--- a/src/arch/arm64/spintable.c
+++ /dev/null
@@ -1,96 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright 2014 Google Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * 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.
- */
-
-#include <arch/cache.h>
-#include <arch/spintable.h>
-#include <arch/transition.h>
-#include <console/console.h>
-#include <cpu/cpu.h>
-#include <cbmem.h>
-#include <string.h>
-
-static struct spintable_attributes spin_attrs;
-
-void spintable_init(void *monitor_address)
-{
-	extern void __wait_for_spin_table_request(void);
-	const size_t code_size = 4096;
-
-	if (monitor_address == NULL) {
-		printk(BIOS_ERR, "spintable: NULL address to monitor.\n");
-		return;
-	}
-
-	spin_attrs.entry = cbmem_add(CBMEM_ID_SPINTABLE, code_size);
-
-	if (spin_attrs.entry == NULL)
-		return;
-
-	spin_attrs.addr = monitor_address;
-
-	printk(BIOS_INFO, "spintable @ %p will monitor %p\n",
-		spin_attrs.entry, spin_attrs.addr);
-
-	/* Ensure the memory location is zero'd out. */
-	*(uint64_t *)monitor_address = 0;
-
-	memcpy(spin_attrs.entry, __wait_for_spin_table_request, code_size);
-
-	dcache_clean_invalidate_by_mva(monitor_address, sizeof(uint64_t));
-	dcache_clean_invalidate_by_mva(spin_attrs.entry, code_size);
-}
-
-static void spintable_enter(void *unused)
-{
-	struct exc_state state;
-	const struct spintable_attributes *attrs;
-	int current_el;
-
-	attrs = spintable_get_attributes();
-
-	current_el = get_current_el();
-
-	if (current_el != EL3)
-		attrs->entry(attrs->addr);
-
-	memset(&state, 0, sizeof(state));
-	state.elx.spsr = get_eret_el(EL2, SPSR_USE_L);
-
-	transition_with_entry(attrs->entry, attrs->addr, &state);
-}
-
-const struct spintable_attributes *spintable_get_attributes(void)
-{
-	if (spin_attrs.entry == NULL) {
-		printk(BIOS_ERR, "spintable: monitor code not present.\n");
-		return NULL;
-	}
-
-	return &spin_attrs;
-}
-
-void spintable_start(void)
-{
-	struct cpu_action action = {
-		.run = spintable_enter,
-	};
-
-	if (spintable_get_attributes() == NULL)
-		return;
-
-	printk(BIOS_INFO, "All non-boot CPUs to enter spintable.\n");
-
-	arch_run_on_all_cpus_but_self_async(&action);
-}
diff --git a/src/arch/arm64/spintable_asm.S b/src/arch/arm64/spintable_asm.S
deleted file mode 100644
index 470a9bb3ef..0000000000
--- a/src/arch/arm64/spintable_asm.S
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright 2014 Google Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * 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.
- */
-
-#include <arch/asm.h>
-
-ENTRY(__wait_for_spin_table_request)
-	/* Entry here is in EL2 with the magic address in x0. */
-	mov	x28, x0
-1:
-	ldr	x27, [x28]
-	cmp	x27, xzr
-	b.ne	2f
-	wfe
-	b	1b
-2:
-	/* Entry into the kernel. */
-	mov	x0, xzr
-	mov	x1, xzr
-	mov	x2, xzr
-	mov	x3, xzr
-	br	x27
-ENDPROC(__wait_for_spin_table_request)