x86: broadwell: Add power-control support

Broadwell requires quite a bit of power-management setup. Add code to set
this up correctly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Bin Meng <bmeng.cn@gmail.com>
[squashed in http://patchwork.ozlabs.org/patch/598373/

]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/broadwell/Makefile

@@ -10,5 +10,6 @@ obj-y += lpc.o
 obj-y += northbridge.o
 obj-y += pch.o
 obj-y += pinctrl_broadwell.o
+obj-y += power_state.o
 obj-y += refcode.o
 obj-y += sata.o

arch/x86/cpu/broadwell/power_state.c

+/*
+ * From coreboot src/soc/intel/broadwell/romstage/power_state.c
+ *
+ * Copyright (C) 2016 Google, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <pci.h>
+#include <asm/io.h>
+#include <asm/intel_regs.h>
+#include <asm/arch/iomap.h>
+#include <asm/arch/lpc.h>
+#include <asm/arch/pch.h>
+#include <asm/arch/pm.h>
+
+/* Return 0, 3, or 5 to indicate the previous sleep state. */
+static int prev_sleep_state(struct chipset_power_state *ps)
+{
+	/* Default to S0. */
+	int prev_sleep_state = SLEEP_STATE_S0;
+
+	if (ps->pm1_sts & WAK_STS) {
+		switch ((ps->pm1_cnt & SLP_TYP) >> SLP_TYP_SHIFT) {
+#if CONFIG_HAVE_ACPI_RESUME
+		case SLP_TYP_S3:
+			prev_sleep_state = SLEEP_STATE_S3;
+			break;
+#endif
+		case SLP_TYP_S5:
+			prev_sleep_state = SLEEP_STATE_S5;
+			break;
+		}
+		/* Clear SLP_TYP. */
+		outl(ps->pm1_cnt & ~(SLP_TYP), ACPI_BASE_ADDRESS + PM1_CNT);
+	}
+
+	if (ps->gen_pmcon3 & (PWR_FLR | SUS_PWR_FLR))
+		prev_sleep_state = SLEEP_STATE_S5;
+
+	return prev_sleep_state;
+}
+
+static void dump_power_state(struct chipset_power_state *ps)
+{
+	debug("PM1_STS:   %04x\n", ps->pm1_sts);
+	debug("PM1_EN:    %04x\n", ps->pm1_en);
+	debug("PM1_CNT:   %08x\n", ps->pm1_cnt);
+	debug("TCO_STS:   %04x %04x\n", ps->tco1_sts, ps->tco2_sts);
+
+	debug("GPE0_STS:  %08x %08x %08x %08x\n",
+	      ps->gpe0_sts[0], ps->gpe0_sts[1],
+	      ps->gpe0_sts[2], ps->gpe0_sts[3]);
+	debug("GPE0_EN:   %08x %08x %08x %08x\n",
+	      ps->gpe0_en[0], ps->gpe0_en[1],
+	      ps->gpe0_en[2], ps->gpe0_en[3]);
+
+	debug("GEN_PMCON: %04x %04x %04x\n",
+	      ps->gen_pmcon1, ps->gen_pmcon2, ps->gen_pmcon3);
+
+	debug("Previous Sleep State: S%d\n",
+	      ps->prev_sleep_state);
+}
+
+/* Fill power state structure from ACPI PM registers */
+void power_state_get(struct udevice *pch_dev, struct chipset_power_state *ps)
+{
+	ps->pm1_sts = inw(ACPI_BASE_ADDRESS + PM1_STS);
+	ps->pm1_en = inw(ACPI_BASE_ADDRESS + PM1_EN);
+	ps->pm1_cnt = inl(ACPI_BASE_ADDRESS + PM1_CNT);
+	ps->tco1_sts = inw(ACPI_BASE_ADDRESS + TCO1_STS);
+	ps->tco2_sts = inw(ACPI_BASE_ADDRESS + TCO2_STS);
+	ps->gpe0_sts[0] = inl(ACPI_BASE_ADDRESS + GPE0_STS(0));
+	ps->gpe0_sts[1] = inl(ACPI_BASE_ADDRESS + GPE0_STS(1));
+	ps->gpe0_sts[2] = inl(ACPI_BASE_ADDRESS + GPE0_STS(2));
+	ps->gpe0_sts[3] = inl(ACPI_BASE_ADDRESS + GPE0_STS(3));
+	ps->gpe0_en[0] = inl(ACPI_BASE_ADDRESS + GPE0_EN(0));
+	ps->gpe0_en[1] = inl(ACPI_BASE_ADDRESS + GPE0_EN(1));
+	ps->gpe0_en[2] = inl(ACPI_BASE_ADDRESS + GPE0_EN(2));
+	ps->gpe0_en[3] = inl(ACPI_BASE_ADDRESS + GPE0_EN(3));
+
+	dm_pci_read_config16(pch_dev, GEN_PMCON_1, &ps->gen_pmcon1);
+	dm_pci_read_config16(pch_dev, GEN_PMCON_2, &ps->gen_pmcon2);
+	dm_pci_read_config16(pch_dev, GEN_PMCON_3, &ps->gen_pmcon3);
+
+	ps->prev_sleep_state = prev_sleep_state(ps);
+
+	dump_power_state(ps);
+}

arch/x86/include/asm/arch-broadwell/pm.h

+/*
+ * From coreboot src/soc/intel/broadwell/include/soc/pm.h
+ *
+ * Copyright (C) 2016 Google, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#ifndef __ASM_ARCH_PM_H
+#define __ASM_ARCH_PM_H
+
+#define PM1_STS			0x00
+#define  WAK_STS		(1 << 15)
+#define  PCIEXPWAK_STS		(1 << 14)
+#define  PRBTNOR_STS		(1 << 11)
+#define  RTC_STS		(1 << 10)
+#define  PWRBTN_STS		(1 << 8)
+#define  GBL_STS		(1 << 5)
+#define  BM_STS			(1 << 4)
+#define  TMROF_STS		(1 << 0)
+#define PM1_EN			0x02
+#define  PCIEXPWAK_DIS		(1 << 14)
+#define  RTC_EN			(1 << 10)
+#define  PWRBTN_EN		(1 << 8)
+#define  GBL_EN			(1 << 5)
+#define  TMROF_EN		(1 << 0)
+#define PM1_CNT			0x04
+#define  SLP_EN			(1 << 13)
+#define  SLP_TYP		(7 << 10)
+#define   SLP_TYP_SHIFT         10
+#define   SLP_TYP_S0		0
+#define   SLP_TYP_S1		1
+#define   SLP_TYP_S3		5
+#define   SLP_TYP_S4		6
+#define   SLP_TYP_S5		7
+#define  GBL_RLS		(1 << 2)
+#define  BM_RLD			(1 << 1)
+#define  SCI_EN			(1 << 0)
+#define PM1_TMR			0x08
+#define SMI_EN			0x30
+#define  XHCI_SMI_EN		(1 << 31)
+#define  ME_SMI_EN		(1 << 30)
+#define  GPIO_UNLOCK_SMI_EN	(1 << 27)
+#define  INTEL_USB2_EN		(1 << 18)
+#define  LEGACY_USB2_EN		(1 << 17)
+#define  PERIODIC_EN		(1 << 14)
+#define  TCO_EN			(1 << 13)
+#define  MCSMI_EN		(1 << 11)
+#define  BIOS_RLS		(1 <<  7)
+#define  SWSMI_TMR_EN		(1 <<  6)
+#define  APMC_EN		(1 <<  5)
+#define  SLP_SMI_EN		(1 <<  4)
+#define  LEGACY_USB_EN		(1 <<  3)
+#define  BIOS_EN		(1 <<  2)
+#define  EOS			(1 <<  1)
+#define  GBL_SMI_EN		(1 <<  0)
+#define SMI_STS			0x34
+#define UPWRC			0x3c
+#define  UPWRC_WS		(1 << 8)
+#define  UPWRC_WE		(1 << 1)
+#define  UPWRC_SMI		(1 << 0)
+#define GPE_CNTL		0x42
+#define  SWGPE_CTRL		(1 << 1)
+#define DEVACT_STS		0x44
+#define PM2_CNT			0x50
+#define TCO1_CNT		0x60
+#define  TCO_TMR_HLT		(1 << 11)
+#define TCO1_STS		0x64
+#define  DMISCI_STS		(1 << 9)
+#define TCO2_STS		0x66
+#define  TCO2_STS_SECOND_TO	(1 << 1)
+
+#define GPE0_REG_MAX		4
+#define GPE0_REG_SIZE		32
+#define GPE0_STS(x)		(0x80 + (x * 4))
+#define  GPE_31_0		0	/* 0x80/0x90 = GPE[31:0] */
+#define  GPE_63_32		1	/* 0x84/0x94 = GPE[63:32] */
+#define  GPE_94_64		2	/* 0x88/0x98 = GPE[94:64] */
+#define  GPE_STD		3	/* 0x8c/0x9c = Standard GPE */
+#define   WADT_STS		(1 << 18)
+#define   GP27_STS		(1 << 16)
+#define   PME_B0_STS		(1 << 13)
+#define   ME_SCI_STS		(1 << 12)
+#define   PME_STS		(1 << 11)
+#define   BATLOW_STS		(1 << 10)
+#define   PCI_EXP_STS		(1 << 9)
+#define   SMB_WAK_STS		(1 << 7)
+#define   TCOSCI_STS		(1 << 6)
+#define   SWGPE_STS		(1 << 2)
+#define   HOT_PLUG_STS		(1 << 1)
+#define GPE0_EN(x)		(0x90 + (x * 4))
+#define   WADT_en		(1 << 18)
+#define   GP27_EN		(1 << 16)
+#define   PME_B0_EN		(1 << 13)
+#define   ME_SCI_EN		(1 << 12)
+#define   PME_EN		(1 << 11)
+#define   BATLOW_EN		(1 << 10)
+#define   PCI_EXP_EN		(1 << 9)
+#define   TCOSCI_EN		(1 << 6)
+#define   SWGPE_EN		(1 << 2)
+#define   HOT_PLUG_EN		(1 << 1)
+
+#define MAINBOARD_POWER_OFF	0
+#define MAINBOARD_POWER_ON	1
+#define MAINBOARD_POWER_KEEP	2
+
+#define SLEEP_STATE_S0		0
+#define SLEEP_STATE_S3		3
+#define SLEEP_STATE_S5		5
+
+struct chipset_power_state {
+	uint16_t pm1_sts;
+	uint16_t pm1_en;
+	uint32_t pm1_cnt;
+	uint16_t tco1_sts;
+	uint16_t tco2_sts;
+	uint32_t gpe0_sts[4];
+	uint32_t gpe0_en[4];
+	uint16_t gen_pmcon1;
+	uint16_t gen_pmcon2;
+	uint16_t gen_pmcon3;
+	int prev_sleep_state;
+	uint16_t hsio_version;
+	uint16_t hsio_checksum;
+};
+
+void power_state_get(struct udevice *pch_dev, struct chipset_power_state *ps);
+
+#endif