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>

2 files changed, 91 insertions, 0 deletions

diff --git a/arch/x86/cpu/broadwell/Makefile b/arch/x86/cpu/broadwell/Makefile
index a542feffc7..5a62afae59 100644
--- a/arch/x86/cpu/broadwell/Makefile
+++ b/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
diff --git a/arch/x86/cpu/broadwell/power_state.c b/arch/x86/cpu/broadwell/power_state.c
new file mode 100644
index 0000000000..2b9a6bf3a1
--- /dev/null
+++ b/arch/x86/cpu/broadwell/power_state.c
@@ -0,0 +1,90 @@
+/*
+ * 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);
+}