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>

include/power/acpi_pmc.h

@@ -0,0 +1,185 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#ifndef __ACPI_PMC_H
+#define __ACPI_PMC_H
+
+enum {
+	GPE0_REG_MAX	= 4,
+};
+
+/**
+ * struct acpi_pmc_upriv - holds common data for the x86 PMC
+ *
+ * @pmc_bar0: Base address 0 of PMC
+ * @pmc_bar1: Base address 2 of PMC
+ * @acpi_base: Base address of ACPI block
+ * @pm1_sts: PM1 status
+ * @pm1_en: PM1 enable
+ * @pm1_cnt: PM1 control
+ * @gpe_cfg: Address of GPE_CFG register
+ * @gpe0_dwx_mask: Mask to use for each GPE0 (typically 7 or 0xf)
+ * @gpe0_dwx_shift_base: Base shift value to use for GPE0 (0 or 4)
+ * @gpe0_sts_req: GPE0 status register offset
+ * @gpe0_en_req: GPE0 enable register offset
+ * @gpe0_sts: GPE0 status values
+ * @gpe0_en: GPE0 enable values
+ * @gpe0_dw: GPE0 DW values
+ * @gpe0_count: Number of GPE0 registers
+ * @tco1_sts: TCO1 status
+ * @tco2_sts: TCO2 status
+ * @prsts: Power and reset status
+ * @gen_pmcon1: General power mgmt configuration 1
+ * @gen_pmcon2: General power mgmt configuration 2
+ * @gen_pmcon3: General power mgmt configuration 3
+ */
+struct acpi_pmc_upriv {
+	void *pmc_bar0;
+	void *pmc_bar2;
+	u32 acpi_base;
+	u16 pm1_sts;
+	u16 pm1_en;
+	u32 pm1_cnt;
+	u32 *gpe_cfg;
+	u32 gpe0_dwx_mask;
+	u32 gpe0_dwx_shift_base;
+	u32 gpe0_sts_reg;
+	u32 gpe0_en_reg;
+	u32 gpe0_sts[GPE0_REG_MAX];
+	u32 gpe0_en[GPE0_REG_MAX];
+	u32 gpe0_dw[GPE0_REG_MAX];
+	int gpe0_count;
+	u16 tco1_sts;
+	u16 tco2_sts;
+	u32 prsts;
+	u32 gen_pmcon1;
+	u32 gen_pmcon2;
+	u32 gen_pmcon3;
+};
+
+struct acpi_pmc_ops {
+	/**
+	 * init() - Set up the PMC for use
+	 *
+	 * This reads the current state of the PMC. Most of the state is read
+	 * automatically by the uclass since it is common.
+	 *
+	 * This is optional.
+	 *
+	 * @dev: PMC device to use
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*init)(struct udevice *dev);
+
+	/**
+	 * prev_sleep_state() - Get the previous sleep state (optional)
+	 *
+	 * This reads various state registers and returns the sleep state from
+	 * which the system woke. If this method is not provided, the uclass
+	 * will return a calculated value.
+	 *
+	 * This is optional.
+	 *
+	 * @dev: PMC device to use
+	 * @prev_sleep_state: Previous sleep state as calculated by the uclass.
+	 *	The method can use this as the return value or calculate its
+	 *	own.
+	 *
+	 * @return enum acpi_sleep_state indicating the previous sleep state
+	 *	(ACPI_S0, ACPI_S3 or ACPI_S5), or -ve on error
+	 */
+	int (*prev_sleep_state)(struct udevice *dev, int prev_sleep_state);
+
+	/**
+	 * disable_tco() - Disable the timer/counter
+	 *
+	 * Disables the timer/counter in the PMC
+	 *
+	 * This is optional.
+	 *
+	 * @dev: PMC device to use
+	 * @return 0
+	 */
+	int (*disable_tco)(struct udevice *dev);
+
+	/**
+	 * global_reset_set_enable() - Enable/Disable global reset
+	 *
+	 * Enable or disable global reset. If global reset is enabled, both hard
+	 * reset and soft reset will trigger global reset, where both host and
+	 * TXE are reset. This is cleared on cold boot, hard reset, soft reset
+	 * and Sx.
+	 *
+	 * This is optional.
+	 *
+	 * @dev: PMC device to use
+	 * @enable: true to enable global reset, false to disable
+	 * @return 0
+	 */
+	int (*global_reset_set_enable)(struct udevice *dev, bool enable);
+};
+
+#define acpi_pmc_get_ops(dev)	((struct acpi_pmc_ops *)(dev)->driver->ops)
+
+/**
+ * init() - Set up the PMC for use
+ *
+ * This reads the current state of the PMC. This reads in the common registers,
+ * then calls the device's init() method to read the SoC-specific registers.
+ *
+ * @return 0 if OK, -ve on error
+ */
+int pmc_init(struct udevice *dev);
+
+/**
+ * pmc_prev_sleep_state() - Get the previous sleep state
+ *
+ * This reads various state registers and returns the sleep state from
+ * which the system woke.
+ *
+ * @return enum acpi_sleep_state indicating the previous sleep state
+ *	(ACPI_S0, ACPI_S3 or ACPI_S5), or -ve on error
+ */
+int pmc_prev_sleep_state(struct udevice *dev);
+
+/**
+ * pmc_disable_tco() - Disable the timer/counter
+ *
+ * Disables the timer/counter in the PMC
+ *
+ * @dev: PMC device to use
+ * @return 0
+ */
+int pmc_disable_tco(struct udevice *dev);
+
+/**
+ * pmc_global_reset_set_enable() - Enable/Disable global reset
+ *
+ * Enable or disable global reset. If global reset is enabled, both hard
+ * reset and soft reset will trigger global reset, where both host and
+ * TXE are reset. This is cleared on cold boot, hard reset, soft reset
+ * and Sx.
+ *
+ * @dev: PMC device to use
+ * @enable: true to enable global reset, false to disable
+ * @return 0
+ */
+int pmc_global_reset_set_enable(struct udevice *dev, bool enable);
+
+int pmc_ofdata_to_uc_platdata(struct udevice *dev);
+
+int pmc_disable_tco_base(ulong tco_base);
+
+void pmc_dump_info(struct udevice *dev);
+
+/**
+ * pmc_gpe_init() - Set up general-purpose events
+ *
+ * @dev: PMC device
+ * @return 0 if OK, -ve on error
+ */
+int pmc_gpe_init(struct udevice *dev);
+
+#endif