soc/apollolake: Add helper functions to access Power Management Registers

Change-Id: I928efea33030e03cbbaead6812c617d20446f7c9
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-on: https://review.coreboot.org/14289
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/soc/intel/apollolake/Makefile.inc

@@ -26,8 +26,10 @@ romstage-$(CONFIG_SOC_UART_DEBUG) += uart_early.c
 romstage-y += memmap.c
 romstage-y += mmap_boot.c
 romstage-y += tsc_freq.c
+romstage-y += pmutil.c
 
 smm-y += placeholders.c
+smm-y += pmutil.c
 
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += acpi.c
 ramstage-y += cpu.c
@@ -42,6 +44,7 @@ ramstage-y += uart.c
 ramstage-y += northbridge.c
 ramstage-y += spi.c
 ramstage-y += tsc_freq.c
+ramstage-y += pmutil.c
 
 postcar-y += exit_car.S
 postcar-y += memmap.c

src/soc/intel/apollolake/include/soc/pm.h

@@ -1,7 +1,7 @@
 /*
  * This file is part of the coreboot project.
  *
- * Copyright (C) 2016 Intel Corp.
+ * Copyright (C) 2015-2016 Intel Corp.
  * (Written by Lance Zhao <lijian.zhao@intel.com> for Intel Corp.)
  *
  * This program is free software; you can redistribute it and/or modify
@@ -18,19 +18,130 @@
 #ifndef _SOC_APOLLOLAKE_PM_H_
 #define _SOC_APOLLOLAKE_PM_H_
 
-/* ACPI_BASE_ADDRESS / PMBASE */
+#include <stdint.h>
+
+/* ACPI_BASE_ADDRESS */
 
 #define PM1_STS			0x00
+#define   WAK_STS		(1 << 15)
+#define   PWRBTN_STS		(1 << 8)
+
 #define PM1_EN			0x02
+#define   PCIEXPWAK_DIS		(1 << 14)
+#define   USB_WAKE_EN		(1 << 13)
+#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_SHIFT		10
+#define   SLP_TYP		(7 << SLP_TYP_SHIFT)
+#define    SLP_TYP_S0		0
+#define    SLP_TYP_S3		5
+#define    SLP_TYP_S4		6
+#define    SLP_TYP_S5		7
+#define   SCI_EN		(1 << 0)
+
 #define PM1_TMR			0x08
+
 #define SMI_EN			0x40
+
+#define SMI_OCP_CSE		27
+#define SMI_SPI			26
+#define SMI_SPI_SSMI		25
+#define SMI_SCC2		21
+#define SMI_PCIE		20
+#define SMI_SCS			19
+#define SMI_HOST_SMBUS		18
+#define SMI_XHCI		17
+#define SMI_SMBUS		16
+#define SMI_SERIRQ		15
+#define SMI_PERIODIC		14
+#define SMI_TCO			13
+#define SMI_MCSMI		12
+#define SMI_GPIO_UNLOCK_SSMI	11
+#define SMI_GPIO		10
+#define SMI_BIOS_RLS		7
+#define SMI_SWSMI_TMR		6
+#define SMI_APMC		5
+#define SMI_SLP			4
+#define SMI_LEGACY_USB		3
+#define SMI_BIOS		2
+#define SMI_EOS			1
+#define SMI_GBL			0
+
+#define   USB_EN		(1 << SMI_XHCI) /* Legacy USB2 SMI logic */
+#define   PERIODIC_EN		(1 << SMI_PERIODIC) /* SMI on PERIODIC_STS in SMI_STS */
+#define   TCO_EN		(1 << SMI_TCO) /* Enable TCO Logic (BIOSWE et al) */
+#define   BIOS_RLS		(1 << SMI_BIOS_RLS) /* asserts SCI on bit set */
+#define   SWSMI_TMR_EN		(1 << SMI_SWSMI_TMR) /* start software smi timer on bit set */
+#define   APMC_EN		(1 << SMI_APMC) /* Writes to APM_CNT cause SMI# */
+#define   SLP_SMI_EN		(1 << SMI_SLP) /* Write to SLP_EN in PM1_CNT asserts SMI# */
+#define   BIOS_EN		(1 << SMI_BIOS) /* Assert SMI# on GBL_RLS bit */
+#define   EOS			(1 << SMI_EOS) /* End of SMI (deassert SMI#) */
+#define   GBL_SMI_EN		(1 << SMI_GBL) /* Global SMI Enable */
+
 #define SMI_STS			0x44
 #define GPE_CNTL		0x50
 #define DEVACT_STS		0x4c
+#define TCO_STS			0x64
+#define   TCO_TIMEOUT		(1 << 3)
+#define TCO1_CNT		0x68
 
 #define GPE0_REG_MAX		4
+#define GPE0_REG_SIZE		32
 #define GPE0_STS(x)		(0x20 + (x * 4))
 #define GPE0_EN(x)		(0x30 + (x * 4))
+#define   PME_B0_EN		(1 << 13)
 
-#endif	/* _SOC_APOLLOLAKE_PM_H_ */
+/* Memory mapped IO registers behind PMC_BASE_ADDRESS */
+#define PRSTS			0x1000
+#define GEN_PMCON1		0x1020
+#       define PWR_FLR		(1 << 16)
+#       define SUS_PWR_FLR	(1 << 14)
+#define GEN_PMCON2		0x1024
+#       define RPS		(1 <<  2)
+#define GEN_PMCON3		0x1028
+
+/* Generic sleep state types */
+#define SLEEP_STATE_S0		0
+#define SLEEP_STATE_S3		3
+#define SLEEP_STATE_S5		5
+
+/* Track power state from reset to log events. */
+struct chipset_power_state {
+        uint16_t pm1_sts;
+        uint16_t pm1_en;
+        uint32_t pm1_cnt;
+        uint32_t gpe0_sts[GPE0_REG_MAX];
+        uint32_t gpe0_en[GPE0_REG_MAX];
+        uint32_t tco_sts;
+        uint32_t prsts;
+        uint32_t gen_pmcon1;
+        uint32_t gen_pmcon2;
+        uint32_t gen_pmcon3;
+        uint32_t prev_sleep_state;
+} __attribute__((packed));
+
+int fill_power_state(struct chipset_power_state *ps);
+int chipset_prev_sleep_state(struct chipset_power_state *ps);
+
+/* Power Management Utility Functions. */
+uint32_t clear_smi_status(void);
+uint16_t clear_pm1_status(void);
+uint32_t clear_tco_status(void);
+uint32_t clear_gpe_status(void);
+void clear_pmc_status(void);
+uint32_t get_smi_en(void);
+void enable_smi(uint32_t mask);
+void disable_smi(uint32_t mask);
+void enable_pm1(uint16_t events);
+void enable_pm1_control(uint32_t mask);
+void disable_pm1_control(uint32_t mask);
+void enable_gpe(uint32_t mask);
+void disable_gpe(uint32_t mask);
+void disable_all_gpe(void);
+
+#endif

src/soc/intel/apollolake/pmutil.c

@@ -0,0 +1,327 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ * Copyright (C) 2015-2016 Intel Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <rules.h>
+#include <device/pci_def.h>
+#include <soc/iomap.h>
+#include <soc/pm.h>
+#include <device/device.h>
+#include <device/pci.h>
+
+
+static void print_num_status_bits(int num_bits, uint32_t status,
+				  const char * const bit_names[])
+{
+	int i;
+
+	if (!status)
+		return;
+
+	for (i = num_bits - 1; i >= 0; i--) {
+		if (status & (1 << i)) {
+			if (bit_names[i])
+				printk(BIOS_DEBUG, "%s ", bit_names[i]);
+			else
+				printk(BIOS_DEBUG, "BIT%d ", i);
+		}
+	}
+}
+
+static uint32_t print_smi_status(uint32_t smi_sts)
+{
+	static const char * const smi_sts_bits[] = {
+		[2] = "BIOS",
+		[3] = "LEGACY USB",
+		[4] = "SLP_SMI",
+		[5] = "APM",
+		[6] = "SWSMI_TMR",
+		[10]= "GPIO_SMI",
+		[11]= "GPIO_UNLOCK_SSMI",
+		[12] = "MCSMI",
+		[13] = "TCO",
+		[14] = "PERIODIC",
+		[15] = "SERIRQ",
+		[16] = "SMBUS_SMI",
+		[17] = "XHCI",
+		[18] = "HOST_SMBUS",
+		[19] = "SCS",
+		[20] = "PCI_EXP_SMI",
+		[21] = "SCC2",
+		[25] = "SPI_SSMI",
+		[26] = "SPI",
+		[27] = "OCP_CSE",
+	};
+
+	if (!smi_sts)
+		return 0;
+
+	printk(BIOS_DEBUG, "SMI_STS: ");
+	print_num_status_bits(ARRAY_SIZE(smi_sts_bits), smi_sts, smi_sts_bits);
+	printk(BIOS_DEBUG, "\n");
+
+	return smi_sts;
+}
+
+static uint32_t reset_smi_status(void)
+{
+	uint32_t smi_sts = inl(ACPI_PMIO_BASE + SMI_STS);
+	outl(smi_sts, ACPI_PMIO_BASE + SMI_STS);
+	return smi_sts;
+}
+
+uint32_t clear_smi_status(void)
+{
+	return print_smi_status(reset_smi_status());
+}
+
+uint32_t get_smi_en(void)
+{
+	return inl(ACPI_PMIO_BASE + SMI_EN);
+}
+
+void enable_smi(uint32_t mask)
+{
+	uint32_t smi_en = inl(ACPI_PMIO_BASE + SMI_EN);
+	smi_en |= mask;
+	outl(smi_en, ACPI_PMIO_BASE + SMI_EN);
+}
+
+void disable_smi(uint32_t mask)
+{
+	uint32_t smi_en = inl(ACPI_PMIO_BASE + SMI_EN);
+	smi_en &= ~mask;
+	outl(smi_en, ACPI_PMIO_BASE + SMI_EN);
+}
+
+void enable_pm1_control(uint32_t mask)
+{
+	uint32_t pm1_cnt = inl(ACPI_PMIO_BASE + PM1_CNT);
+	pm1_cnt |= mask;
+	outl(pm1_cnt, ACPI_PMIO_BASE + PM1_CNT);
+}
+
+void disable_pm1_control(uint32_t mask)
+{
+	uint32_t pm1_cnt = inl(ACPI_PMIO_BASE + PM1_CNT);
+	pm1_cnt &= ~mask;
+	outl(pm1_cnt, ACPI_PMIO_BASE + PM1_CNT);
+}
+
+static uint16_t reset_pm1_status(void)
+{
+	uint16_t pm1_sts = inw(ACPI_PMIO_BASE + PM1_STS);
+	outw(pm1_sts, ACPI_PMIO_BASE + PM1_STS);
+	return pm1_sts;
+}
+
+static uint16_t print_pm1_status(uint16_t pm1_sts)
+{
+	static const char * const pm1_sts_bits[] = {
+		[0] = "TMROF",
+		[5] = "GBL",
+		[8] = "PWRBTN",
+		[10] = "RTC",
+		[11] = "PRBTNOR",
+		[13] = "USB",
+		[14] = "PCIEXPWAK",
+		[15] = "WAK",
+	};
+
+	if (!pm1_sts)
+		return 0;
+
+	printk(BIOS_SPEW, "PM1_STS: ");
+	print_num_status_bits(ARRAY_SIZE(pm1_sts_bits), pm1_sts, pm1_sts_bits);
+	printk(BIOS_SPEW, "\n");
+
+	return pm1_sts;
+}
+
+uint16_t clear_pm1_status(void)
+{
+	return print_pm1_status(reset_pm1_status());
+}
+
+void enable_pm1(uint16_t events)
+{
+	outw(events, ACPI_PMIO_BASE + PM1_EN);
+}
+
+static uint32_t print_tco_status(uint32_t tco_sts)
+{
+	static const char * const tco_sts_bits[] = {
+		[3] = "TIMEOUT",
+		[17] = "SECOND_TO",
+	};
+
+	if (!tco_sts)
+		return 0;
+
+	printk(BIOS_DEBUG, "TCO_STS: ");
+	print_num_status_bits(ARRAY_SIZE(tco_sts_bits), tco_sts, tco_sts_bits);
+	printk(BIOS_DEBUG, "\n");
+
+	return tco_sts;
+}
+
+static uint32_t reset_tco_status(void)
+{
+	uint32_t tco_sts = inl(ACPI_PMIO_BASE + TCO_STS);
+	uint32_t tco_en = inl(ACPI_PMIO_BASE + TCO1_CNT);
+
+	outl(tco_sts, ACPI_PMIO_BASE + TCO_STS);
+	return tco_sts & tco_en;
+}
+
+uint32_t clear_tco_status(void)
+{
+	return print_tco_status(reset_tco_status());
+}
+
+void enable_gpe(uint32_t mask)
+{
+	uint32_t gpe0a_en = inl(ACPI_PMIO_BASE + GPE0_EN(0));
+	gpe0a_en |= mask;
+	outl(gpe0a_en, ACPI_PMIO_BASE + GPE0_EN(0));
+}
+
+void disable_gpe(uint32_t mask)
+{
+	uint32_t gpe0a_en = inl(ACPI_PMIO_BASE + GPE0_EN(0));
+	gpe0a_en &= ~mask;
+	outl(gpe0a_en, ACPI_PMIO_BASE + GPE0_EN(0));
+}
+
+void disable_all_gpe(void)
+{
+	disable_gpe(~0);
+}
+
+
+static uint32_t reset_gpe_status(void)
+{
+	uint32_t gpe_sts = inl(ACPI_PMIO_BASE + GPE0_STS(0));
+	outl(gpe_sts, ACPI_PMIO_BASE + GPE0_STS(0));
+	return gpe_sts;
+}
+
+static uint32_t print_gpe_sts(uint32_t gpe_sts)
+{
+	static const char * const gpe_sts_bits[] = {
+		[0] = "PCIE_SCI",
+		[2] = "SWGPE",
+		[3] = "PCIE_WAKE0",
+		[4] = "PUNIT",
+		[6] = "PCIE_WAKE1",
+		[7] = "PCIE_WAKE2",
+		[8] = "PCIE_WAKE3",
+		[9] = "PCI_EXP",
+		[10] = "BATLOW",
+		[11] = "CSE_PME",
+		[12] = "XDCI_PME",
+		[13] = "XHCI_PME",
+		[14] = "AVS_PME",
+		[15] = "GPIO_TIER1_SCI",
+		[16] = "SMB_WAK",
+		[17] = "SATA_PME",
+	};
+
+	if (!gpe_sts)
+		return gpe_sts;
+
+	printk(BIOS_DEBUG, "GPE0a_STS: ");
+	print_num_status_bits(ARRAY_SIZE(gpe_sts_bits), gpe_sts, gpe_sts_bits);
+	printk(BIOS_DEBUG, "\n");
+
+	return gpe_sts;
+}
+
+uint32_t clear_gpe_status(void)
+{
+	return print_gpe_sts(reset_gpe_status());
+}
+
+void clear_pmc_status(void)
+{
+	uint32_t prsts;
+	uint32_t gen_pmcon1;
+
+	prsts = read32((void *)(PMC_BAR0 + PRSTS));
+	gen_pmcon1 = read32((void *)(PMC_BAR0 + GEN_PMCON1));
+
+	/* Clear the status bits. The RPS field is cleared on a 0 write. */
+	write32((void *)(PMC_BAR0 + GEN_PMCON1), gen_pmcon1 & ~RPS);
+	write32((void *)(PMC_BAR0 + PRSTS), prsts);
+}
+
+
+/* Return 0, 3, or 5 to indicate the previous sleep state. */
+int chipset_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 IS_ENABLED(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;
+		}
+	}
+	return prev_sleep_state;
+}
+
+/* returns prev_sleep_state */
+int fill_power_state(struct chipset_power_state *ps)
+{
+	int i;
+	ps->pm1_sts = inw(ACPI_PMIO_BASE + PM1_STS);
+	ps->pm1_en = inw(ACPI_PMIO_BASE + PM1_EN);
+	ps->pm1_cnt = inl(ACPI_PMIO_BASE + PM1_CNT);
+	ps->tco_sts = inl(ACPI_PMIO_BASE + TCO_STS);
+	ps->prsts = read32((void *)(PMC_BAR0 + PRSTS));
+	ps->gen_pmcon1 =read32((void *)(PMC_BAR0 + GEN_PMCON1));
+	ps->gen_pmcon2 = read32((void *)(PMC_BAR0 + GEN_PMCON2));
+	ps->gen_pmcon3 = read32((void *)(PMC_BAR0 + GEN_PMCON3));
+
+	ps->prev_sleep_state = chipset_prev_sleep_state(ps);
+
+	printk(BIOS_DEBUG, "pm1_sts: %04x pm1_en: %04x pm1_cnt: %08x\n",
+		ps->pm1_sts, ps->pm1_en, ps->pm1_cnt);
+	printk(BIOS_DEBUG, "prsts: %08x tco_sts: %08x\n",
+		ps->prsts, ps->tco_sts);
+	printk(BIOS_DEBUG,
+		 "gen_pmcon1: %08x gen_pmcon2: %08x gen_pmcon3: %08x\n",
+		ps->gen_pmcon1, ps->gen_pmcon2, ps->gen_pmcon3);
+	printk(BIOS_DEBUG, "smi_en: %08x smi_sts: %08x\n",
+		inl(ACPI_PMIO_BASE + SMI_EN), inl(ACPI_PMIO_BASE + SMI_STS));
+	for (i=0; i < GPE0_REG_MAX; i++) {
+		ps->gpe0_sts[i] = inl(ACPI_PMIO_BASE + GPE0_STS(i));
+		ps->gpe0_en[i] = inl(ACPI_PMIO_BASE + GPE0_EN(i));
+		printk(BIOS_DEBUG, "gpe0_sts[%d]: %08x gpe0_en[%d]: %08x\n",
+			i, ps->gpe0_sts[i], i, ps->gpe0_en[i]);
+	}
+	printk(BIOS_DEBUG, "prev_sleep_state %d\n", ps->prev_sleep_state);
+	return ps->prev_sleep_state;
+}