x86: power: Add an ACPI PMC uclass

Intel x86 SoCs have a power manager/controller which handles several
power-related aspects of the platform. Add a uclass for this, with a few
useful operations.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

4 files changed, 220 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 9495dca33b..cb2c6fe3eb 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -1,5 +1,7 @@
 menu "Power"
 
+source "drivers/power/acpi_pmc/Kconfig"
+
 source "drivers/power/domain/Kconfig"
 
 source "drivers/power/pmic/Kconfig"
diff --git a/drivers/power/acpi_pmc/Kconfig b/drivers/power/acpi_pmc/Kconfig
new file mode 100644
index 0000000000..472a61a9fd
--- /dev/null
+++ b/drivers/power/acpi_pmc/Kconfig
@@ -0,0 +1,25 @@
+config ACPI_PMC
+	bool "Power Manager (x86 PMC) support"
+	help
+	  Enable support for an x86-style power-management controller which
+	  provides features including checking whether the system started from
+	  resume, powering off the system and enabling/disabling the reset
+	  mechanism.
+
+config SPL_ACPI_PMC
+	bool "Power Manager (x86 PMC) support in SPL"
+	default y if ACPI_PMC
+	help
+	  Enable support for an x86-style power-management controller which
+	  provides features including checking whether the system started from
+	  resume, powering off the system and enabling/disabling the reset
+	  mechanism.
+
+config TPL_ACPI_PMC
+	bool "Power Manager (x86 PMC) support in TPL"
+	default y if ACPI_PMC
+	help
+	  Enable support for an x86-style power-management controller which
+	  provides features including checking whether the system started from
+	  resume, powering off the system and enabling/disabling the reset
+	  mechanism.
diff --git a/drivers/power/acpi_pmc/Makefile b/drivers/power/acpi_pmc/Makefile
new file mode 100644
index 0000000000..7c1ba05c9f
--- /dev/null
+++ b/drivers/power/acpi_pmc/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright 2019 Google LLC
+
+obj-$(CONFIG_$(SPL_TPL_)ACPI_PMC) += acpi-pmc-uclass.o
diff --git a/drivers/power/acpi_pmc/acpi-pmc-uclass.c b/drivers/power/acpi_pmc/acpi-pmc-uclass.c
new file mode 100644
index 0000000000..653c71b948
--- /dev/null
+++ b/drivers/power/acpi_pmc/acpi-pmc-uclass.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#define LOG_CATEGORY UCLASS_ACPI_PMC
+
+#include <common.h>
+#include <acpi_s3.h>
+#include <dm.h>
+#include <log.h>
+#include <asm/io.h>
+#include <power/acpi_pmc.h>
+
+enum {
+	PM1_STS		= 0x00,
+	PM1_EN		= 0x02,
+	PM1_CNT		= 0x04,
+
+	GPE0_STS	= 0x20,
+	GPE0_EN		= 0x30,
+};
+
+struct tco_regs {
+	u32 tco_rld;
+	u32 tco_sts;
+	u32 tco1_cnt;
+	u32 tco_tmr;
+};
+
+enum {
+	TCO_STS_TIMEOUT			= 1 << 3,
+	TCO_STS_SECOND_TO_STS		= 1 << 17,
+	TCO1_CNT_HLT			= 1 << 11,
+};
+
+static void pmc_fill_pm_reg_info(struct udevice *dev)
+{
+	struct acpi_pmc_upriv *upriv = dev_get_uclass_priv(dev);
+	int i;
+
+	upriv->pm1_sts = inw(upriv->acpi_base + PM1_STS);
+	upriv->pm1_en = inw(upriv->acpi_base + PM1_EN);
+	upriv->pm1_cnt = inw(upriv->acpi_base + PM1_CNT);
+
+	log_debug("pm1_sts: %04x pm1_en: %04x pm1_cnt: %08x\n",
+		  upriv->pm1_sts, upriv->pm1_en, upriv->pm1_cnt);
+
+	for (i = 0; i < GPE0_REG_MAX; i++) {
+		upriv->gpe0_sts[i] = inl(upriv->acpi_base + GPE0_STS + i * 4);
+		upriv->gpe0_en[i] = inl(upriv->acpi_base + GPE0_EN + i * 4);
+		log_debug("gpe0_sts[%d]: %08x gpe0_en[%d]: %08x\n", i,
+			  upriv->gpe0_sts[i], i, upriv->gpe0_en[i]);
+	}
+}
+
+int pmc_disable_tco_base(ulong tco_base)
+{
+	struct tco_regs *regs = (struct tco_regs *)tco_base;
+
+	debug("tco_base %lx = %x\n", (ulong)&regs->tco1_cnt, TCO1_CNT_HLT);
+	setio_32(&regs->tco1_cnt, TCO1_CNT_HLT);
+
+	return 0;
+}
+
+int pmc_init(struct udevice *dev)
+{
+	const struct acpi_pmc_ops *ops = acpi_pmc_get_ops(dev);
+	int ret;
+
+	pmc_fill_pm_reg_info(dev);
+	if (!ops->init)
+		return -ENOSYS;
+
+	ret = ops->init(dev);
+	if (ret)
+		return log_msg_ret("Failed to init pmc", ret);
+
+#ifdef DEBUG
+	pmc_dump_info(dev);
+#endif
+
+	return 0;
+}
+
+int pmc_prev_sleep_state(struct udevice *dev)
+{
+	struct acpi_pmc_upriv *upriv = dev_get_uclass_priv(dev);
+	const struct acpi_pmc_ops *ops = acpi_pmc_get_ops(dev);
+	int prev_sleep_state = ACPI_S0;	/* Default to S0 */
+
+	if (upriv->pm1_sts & WAK_STS) {
+		switch (acpi_sleep_from_pm1(upriv->pm1_cnt)) {
+		case ACPI_S3:
+			if (IS_ENABLED(HAVE_ACPI_RESUME))
+				prev_sleep_state = ACPI_S3;
+			break;
+		case ACPI_S5:
+			prev_sleep_state = ACPI_S5;
+			break;
+		default:
+			break;
+		}
+
+		/* Clear SLP_TYP */
+		outl(upriv->pm1_cnt & ~SLP_TYP, upriv->acpi_base + PM1_CNT);
+	}
+
+	if (!ops->prev_sleep_state)
+		return prev_sleep_state;
+
+	return ops->prev_sleep_state(dev, prev_sleep_state);
+}
+
+int pmc_disable_tco(struct udevice *dev)
+{
+	const struct acpi_pmc_ops *ops = acpi_pmc_get_ops(dev);
+
+	pmc_fill_pm_reg_info(dev);
+	if (!ops->disable_tco)
+		return -ENOSYS;
+
+	return ops->disable_tco(dev);
+}
+
+int pmc_global_reset_set_enable(struct udevice *dev, bool enable)
+{
+	const struct acpi_pmc_ops *ops = acpi_pmc_get_ops(dev);
+
+	if (!ops->global_reset_set_enable)
+		return -ENOSYS;
+
+	return ops->global_reset_set_enable(dev, enable);
+}
+
+void pmc_dump_info(struct udevice *dev)
+{
+	struct acpi_pmc_upriv *upriv = dev_get_uclass_priv(dev);
+	int i;
+
+	printf("Device: %s\n", dev->name);
+	printf("ACPI base %x, pmc_bar0 %p, pmc_bar2 %p, gpe_cfg %p\n",
+	       upriv->acpi_base, upriv->pmc_bar0, upriv->pmc_bar2,
+	       upriv->gpe_cfg);
+	printf("pm1_sts: %04x pm1_en: %04x pm1_cnt: %08x\n",
+	       upriv->pm1_sts, upriv->pm1_en, upriv->pm1_cnt);
+
+	for (i = 0; i < GPE0_REG_MAX; i++) {
+		printf("gpe0_sts[%d]: %08x gpe0_en[%d]: %08x\n", i,
+		       upriv->gpe0_sts[i], i, upriv->gpe0_en[i]);
+	}
+
+	printf("prsts: %08x\n", upriv->prsts);
+	printf("tco_sts:   %04x %04x\n", upriv->tco1_sts, upriv->tco2_sts);
+	printf("gen_pmcon1: %08x gen_pmcon2: %08x gen_pmcon3: %08x\n",
+	       upriv->gen_pmcon1, upriv->gen_pmcon2, upriv->gen_pmcon3);
+}
+
+int pmc_ofdata_to_uc_platdata(struct udevice *dev)
+{
+	struct acpi_pmc_upriv *upriv = dev_get_uclass_priv(dev);
+	int ret;
+
+	ret = dev_read_u32(dev, "gpe0-dwx-mask", &upriv->gpe0_dwx_mask);
+	if (ret)
+		return log_msg_ret("no gpe0-dwx-mask", ret);
+	ret = dev_read_u32(dev, "gpe0-dwx-shift-base",
+			   &upriv->gpe0_dwx_shift_base);
+	if (ret)
+		return log_msg_ret("no gpe0-dwx-shift-base", ret);
+	ret = dev_read_u32(dev, "gpe0-sts", &upriv->gpe0_sts_reg);
+	if (ret)
+		return log_msg_ret("no gpe0-sts", ret);
+	upriv->gpe0_sts_reg += upriv->acpi_base;
+	ret = dev_read_u32(dev, "gpe0-en", &upriv->gpe0_en_reg);
+	if (ret)
+		return log_msg_ret("no gpe0-en", ret);
+	upriv->gpe0_en_reg += upriv->acpi_base;
+
+	return 0;
+}
+
+UCLASS_DRIVER(acpi_pmc) = {
+	.id		= UCLASS_ACPI_PMC,
+	.name		= "power-mgr",
+	.per_device_auto_alloc_size	= sizeof(struct acpi_pmc_upriv),
+};