135 lines
3.8 KiB
Diff
135 lines
3.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Neil Armstrong <narmstrong@baylibre.com>
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Date: Thu, 3 Nov 2016 15:29:23 +0100
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Subject: HACK: arm64: meson: add Amlogic Meson GX PM Suspend
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The Amlogic Meson GX SoCs uses a non-standard argument to the
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PSCI CPU_SUSPEND call to enter system suspend.
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Implement such call within platform_suspend_ops.
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Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
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---
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drivers/firmware/meson/Kconfig | 6 +
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drivers/firmware/meson/Makefile | 1 +
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drivers/firmware/meson/meson_gx_pm.c | 86 ++++++++++
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3 files changed, 93 insertions(+)
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diff --git a/drivers/firmware/meson/Kconfig b/drivers/firmware/meson/Kconfig
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index f2fdd3756648..d3ead92ac61b 100644
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--- a/drivers/firmware/meson/Kconfig
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+++ b/drivers/firmware/meson/Kconfig
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@@ -9,3 +9,9 @@ config MESON_SM
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depends on ARM64_4K_PAGES
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help
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Say y here to enable the Amlogic secure monitor driver
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+
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+config MESON_GX_PM
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+ bool
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+ default ARCH_MESON if ARM64
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+ help
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+ Say y here to enable the Amlogic GX SoC Power Management
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diff --git a/drivers/firmware/meson/Makefile b/drivers/firmware/meson/Makefile
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index c6c09483b622..0193cdfee32f 100644
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--- a/drivers/firmware/meson/Makefile
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+++ b/drivers/firmware/meson/Makefile
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@@ -1,2 +1,3 @@
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# SPDX-License-Identifier: GPL-2.0-only
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obj-$(CONFIG_MESON_SM) += meson_sm.o
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+obj-$(CONFIG_MESON_GX_PM) += meson_gx_pm.o
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diff --git a/drivers/firmware/meson/meson_gx_pm.c b/drivers/firmware/meson/meson_gx_pm.c
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new file mode 100644
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index 000000000000..c104c2e4c77f
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--- /dev/null
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+++ b/drivers/firmware/meson/meson_gx_pm.c
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@@ -0,0 +1,86 @@
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+/*
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+ * Amlogic Meson GX Power Management
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+ *
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+ * Copyright (c) 2016 Baylibre, SAS.
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+ * Author: Neil Armstrong <narmstrong@baylibre.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of version 2 of the GNU General Public License as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+#include <linux/suspend.h>
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+#include <linux/arm-smccc.h>
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+
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+#include <uapi/linux/psci.h>
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+
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+#include <asm/suspend.h>
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+
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+/*
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+ * The Amlogic GX SoCs uses a special argument value to the
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+ * PSCI CPU_SUSPEND method to enter SUSPEND_MEM.
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+ */
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+
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+#define MESON_SUSPEND_PARAM 0x0010000
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+#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
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+
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+static int meson_gx_suspend_finish(unsigned long arg)
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+{
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+ struct arm_smccc_res res;
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+
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+ arm_smccc_smc(PSCI_FN_NATIVE(0_2, CPU_SUSPEND), arg,
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+ virt_to_phys(cpu_resume), 0, 0, 0, 0, 0, &res);
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+
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+ return res.a0;
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+}
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+
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+static int meson_gx_suspend_enter(suspend_state_t state)
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+{
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+ switch (state) {
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+ case PM_SUSPEND_MEM:
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+ return cpu_suspend(MESON_SUSPEND_PARAM,
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+ meson_gx_suspend_finish);
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+ }
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+
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+ return -EINVAL;
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+}
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+
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+static const struct platform_suspend_ops meson_gx_pm_ops = {
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+ .enter = meson_gx_suspend_enter,
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+ .valid = suspend_valid_only_mem,
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+};
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+
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+static const struct of_device_id meson_gx_pm_match[] = {
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+ { .compatible = "amlogic,meson-gx-pm", },
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+ { /* sentinel */ },
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+};
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+MODULE_DEVICE_TABLE(of, meson_gx_pm_match);
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+
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+static int meson_gx_pm_probe(struct platform_device *pdev)
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+{
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+ suspend_set_ops(&meson_gx_pm_ops);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver meson_gx_pm_driver = {
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+ .probe = meson_gx_pm_probe,
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+ .driver = {
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+ .name = "meson-gx-pm",
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+ .of_match_table = meson_gx_pm_match,
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+ },
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+};
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+
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+module_platform_driver(meson_gx_pm_driver);
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+
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+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
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+MODULE_DESCRIPTION("Amlogic Meson GX PM driver");
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+MODULE_LICENSE("GPL v2");
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--
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Armbian
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