From 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 11:13:47 +0200
Subject: Adding upstream version 2.8.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 plat/allwinner/common/sunxi_cpu_ops.c | 108 ++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 plat/allwinner/common/sunxi_cpu_ops.c

(limited to 'plat/allwinner/common/sunxi_cpu_ops.c')

diff --git a/plat/allwinner/common/sunxi_cpu_ops.c b/plat/allwinner/common/sunxi_cpu_ops.c
new file mode 100644
index 0000000..46e7090
--- /dev/null
+++ b/plat/allwinner/common/sunxi_cpu_ops.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2017-2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <platform_def.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <lib/mmio.h>
+#include <lib/utils_def.h>
+#include <plat/common/platform.h>
+
+#include <sunxi_cpucfg.h>
+#include <sunxi_mmap.h>
+#include <sunxi_private.h>
+
+static void sunxi_cpu_disable_power(unsigned int cluster, unsigned int core)
+{
+	if (mmio_read_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core)) == 0xff)
+		return;
+
+	VERBOSE("PSCI: Disabling power to cluster %d core %d\n", cluster, core);
+
+	mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0xff);
+}
+
+static void sunxi_cpu_enable_power(unsigned int cluster, unsigned int core)
+{
+	if (mmio_read_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core)) == 0)
+		return;
+
+	VERBOSE("PSCI: Enabling power to cluster %d core %d\n", cluster, core);
+
+	/* Power enable sequence from original Allwinner sources */
+	mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0xfe);
+	mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0xf8);
+	mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0xe0);
+	mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0x80);
+	mmio_write_32(SUNXI_CPU_POWER_CLAMP_REG(cluster, core), 0x00);
+	udelay(1);
+}
+
+/* We can't turn ourself off like this, but it works for other cores. */
+static void sunxi_cpu_off(u_register_t mpidr)
+{
+	unsigned int cluster = MPIDR_AFFLVL1_VAL(mpidr);
+	unsigned int core    = MPIDR_AFFLVL0_VAL(mpidr);
+
+	VERBOSE("PSCI: Powering off cluster %d core %d\n", cluster, core);
+
+	/* Deassert DBGPWRDUP */
+	mmio_clrbits_32(SUNXI_CPUCFG_DBG_REG0, BIT(core));
+	/* Activate the core output clamps, but not for core 0. */
+	if (core != 0)
+		mmio_setbits_32(SUNXI_POWEROFF_GATING_REG(cluster), BIT(core));
+	/* Assert CPU power-on reset */
+	mmio_clrbits_32(SUNXI_POWERON_RST_REG(cluster), BIT(core));
+	/* Remove power from the CPU */
+	sunxi_cpu_disable_power(cluster, core);
+}
+
+void sunxi_cpu_on(u_register_t mpidr)
+{
+	unsigned int cluster = MPIDR_AFFLVL1_VAL(mpidr);
+	unsigned int core    = MPIDR_AFFLVL0_VAL(mpidr);
+
+	VERBOSE("PSCI: Powering on cluster %d core %d\n", cluster, core);
+
+	/* Assert CPU core reset */
+	mmio_clrbits_32(SUNXI_CPUCFG_RST_CTRL_REG(cluster), BIT(core));
+	/* Assert CPU power-on reset */
+	mmio_clrbits_32(SUNXI_POWERON_RST_REG(cluster), BIT(core));
+	/* Set CPU to start in AArch64 mode */
+	mmio_setbits_32(SUNXI_AA64nAA32_REG(cluster),
+			BIT(SUNXI_AA64nAA32_OFFSET + core));
+	/* Apply power to the CPU */
+	sunxi_cpu_enable_power(cluster, core);
+	/* Release the core output clamps */
+	mmio_clrbits_32(SUNXI_POWEROFF_GATING_REG(cluster), BIT(core));
+	/* Deassert CPU power-on reset */
+	mmio_setbits_32(SUNXI_POWERON_RST_REG(cluster), BIT(core));
+	/* Deassert CPU core reset */
+	mmio_setbits_32(SUNXI_CPUCFG_RST_CTRL_REG(cluster), BIT(core));
+	/* Assert DBGPWRDUP */
+	mmio_setbits_32(SUNXI_CPUCFG_DBG_REG0, BIT(core));
+}
+
+void sunxi_cpu_power_off_others(void)
+{
+	u_register_t self = read_mpidr();
+	unsigned int cluster;
+	unsigned int core;
+
+	for (cluster = 0; cluster < PLATFORM_CLUSTER_COUNT; ++cluster) {
+		for (core = 0; core < PLATFORM_MAX_CPUS_PER_CLUSTER; ++core) {
+			u_register_t mpidr = (cluster << MPIDR_AFF1_SHIFT) |
+					     (core    << MPIDR_AFF0_SHIFT) |
+					     BIT(31);
+			if (mpidr != self)
+				sunxi_cpu_off(mpidr);
+		}
+	}
+}
-- 
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