lib: utils/hsm: factor out ATCSMU code into an HSM driver

Refactor ATCSMU (System Management Unit) support by moving it from a
system utility into a dedicated FDT-based HSM driver.

Key changes include:

- Moving the functions in lib/utils/sys/atcsmu.c into the new HSM driver
- Moving hart start and stop operations on AE350 platform into the new
  HSM driver
- Converting the assembly-based functions in sleep.S to C code for the
  readability
- Updating the ATCWDT200 driver

Signed-off-by: Ben Zong-You Xie <ben717@andestech.com>
Signed-off-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Link: https://lore.kernel.org/r/20251229071914.1451587-2-ben717@andestech.com
Signed-off-by: Anup Patel <anup@brainfault.org>

3 files changed, 0 insertions, 94 deletions

diff --git a/lib/utils/sys/Kconfig b/lib/utils/sys/Kconfig
index a22191cd..fc388665 100644
--- a/lib/utils/sys/Kconfig
+++ b/lib/utils/sys/Kconfig
@@ -2,10 +2,6 @@
 
 menu "System Device Support"
 
-config SYS_ATCSMU
-	bool "Andes System Management Unit (SMU) support"
-	default n
-
 config SYS_HTIF
 	bool "Host transfere interface (HTIF) support"
 	default n
diff --git a/lib/utils/sys/atcsmu.c b/lib/utils/sys/atcsmu.c
deleted file mode 100644
index 2cba0eb7..00000000
--- a/lib/utils/sys/atcsmu.c
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 2023 Andes Technology Corporation
- *
- * Authors:
- *   Yu Chien Peter Lin <peterlin@andestech.com>
- */
-
-#include <sbi_utils/sys/atcsmu.h>
-#include <sbi/riscv_io.h>
-#include <sbi/sbi_console.h>
-#include <sbi/sbi_error.h>
-#include <sbi/sbi_bitops.h>
-
-inline int smu_set_wakeup_events(struct smu_data *smu, u32 events, u32 hartid)
-{
-	if (smu) {
-		writel(events, (void *)(smu->addr + PCSm_WE_OFFSET(hartid)));
-		return 0;
-	} else
-		return SBI_EINVAL;
-}
-
-inline bool smu_support_sleep_mode(struct smu_data *smu, u32 sleep_mode,
-				   u32 hartid)
-{
-	u32 pcs_cfg;
-
-	if (!smu) {
-		sbi_printf("%s(): Failed to access smu_data\n", __func__);
-		return false;
-	}
-
-	pcs_cfg = readl((void *)(smu->addr + PCSm_CFG_OFFSET(hartid)));
-
-	switch (sleep_mode) {
-	case LIGHTSLEEP_MODE:
-		if (EXTRACT_FIELD(pcs_cfg, PCS_CFG_LIGHT_SLEEP) == 0) {
-			sbi_printf("SMU: hart%d (PCS%d) does not support light sleep mode\n",
-				   hartid, hartid + 3);
-			return false;
-		}
-		break;
-	case DEEPSLEEP_MODE:
-		if (EXTRACT_FIELD(pcs_cfg, PCS_CFG_DEEP_SLEEP) == 0) {
-			sbi_printf("SMU: hart%d (PCS%d) does not support deep sleep mode\n",
-				   hartid, hartid + 3);
-			return false;
-		}
-		break;
-	}
-
-	return true;
-}
-
-inline int smu_set_command(struct smu_data *smu, u32 pcs_ctl, u32 hartid)
-{
-	if (smu) {
-		writel(pcs_ctl, (void *)(smu->addr + PCSm_CTL_OFFSET(hartid)));
-		return 0;
-	} else
-		return SBI_EINVAL;
-}
-
-inline int smu_set_reset_vector(struct smu_data *smu, ulong wakeup_addr,
-				u32 hartid)
-{
-	u32 vec_lo, vec_hi;
-	u64 reset_vector;
-
-	if (!smu)
-		return SBI_EINVAL;
-
-	writel(wakeup_addr, (void *)(smu->addr + HARTn_RESET_VEC_LO(hartid)));
-	writel((u64)wakeup_addr >> 32,
-	       (void *)(smu->addr + HARTn_RESET_VEC_HI(hartid)));
-
-	vec_lo = readl((void *)(smu->addr + HARTn_RESET_VEC_LO(hartid)));
-	vec_hi = readl((void *)(smu->addr + HARTn_RESET_VEC_HI(hartid)));
-	reset_vector = ((u64)vec_hi << 32) | vec_lo;
-
-	if (reset_vector != (u64)wakeup_addr) {
-		sbi_printf("hart%d (PCS%d): Failed to program the reset vector.\n",
-			   hartid, hartid + 3);
-		return SBI_EFAIL;
-	} else
-		return 0;
-}
diff --git a/lib/utils/sys/objects.mk b/lib/utils/sys/objects.mk
index 409d7e8c..d9c67077 100644
--- a/lib/utils/sys/objects.mk
+++ b/lib/utils/sys/objects.mk
@@ -8,4 +8,3 @@
 #
 
 libsbiutils-objs-$(CONFIG_SYS_HTIF) += sys/htif.o
-libsbiutils-objs-$(CONFIG_SYS_ATCSMU) += sys/atcsmu.o