x86: baytrail: acpi: Add APIs for determining/clearing sleep state

This adds APIs for determining previous sleep state from ACPI I/O
registers, as well as clearing sleep state on BayTrail SoC.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stefan Roese <sr@denx.de>

diff --git a/arch/x86/cpu/baytrail/acpi.c b/arch/x86/cpu/baytrail/acpi.c
index fa92d88..55ed7de 100644 (file)
--- a/arch/x86/cpu/baytrail/acpi.c
+++ b/arch/x86/cpu/baytrail/acpi.c
@@ -8,7 +8,9 @@
 #include <cpu.h>
 #include <dm.h>
 #include <dm/uclass-internal.h>
+#include <asm/acpi_s3.h>
 #include <asm/acpi_table.h>
+#include <asm/io.h>
 #include <asm/ioapic.h>
 #include <asm/mpspec.h>
 #include <asm/tables.h>
@@ -187,3 +189,48 @@ void acpi_create_gnvs(struct acpi_global_nvs *gnvs)
        else
                gnvs->iuart_en = 0;
 }
+
+#ifdef CONFIG_HAVE_ACPI_RESUME
+/*
+ * The following two routines are called at a very early stage, even before
+ * FSP 2nd phase API fsp_init() is called. Registers off ACPI_BASE_ADDRESS
+ * and PMC_BASE_ADDRESS are accessed, so we need make sure the base addresses
+ * of these two blocks are programmed by either U-Boot or FSP.
+ *
+ * It has been verified that 1st phase API (see arch/x86/lib/fsp/fsp_car.S)
+ * on Intel BayTrail SoC already initializes these two base addresses so
+ * we are safe to access these registers here.
+ */
+
+enum acpi_sleep_state chipset_prev_sleep_state(void)
+{
+       u32 pm1_sts;
+       u32 pm1_cnt;
+       u32 gen_pmcon1;
+       enum acpi_sleep_state prev_sleep_state = ACPI_S0;
+
+       /* Read Power State */
+       pm1_sts = inw(ACPI_BASE_ADDRESS + PM1_STS);
+       pm1_cnt = inl(ACPI_BASE_ADDRESS + PM1_CNT);
+       gen_pmcon1 = readl(PMC_BASE_ADDRESS + GEN_PMCON1);
+
+       debug("PM1_STS = 0x%x PM1_CNT = 0x%x GEN_PMCON1 = 0x%x\n",
+             pm1_sts, pm1_cnt, gen_pmcon1);
+
+       if (pm1_sts & WAK_STS)
+               prev_sleep_state = acpi_sleep_from_pm1(pm1_cnt);
+
+       if (gen_pmcon1 & (PWR_FLR | SUS_PWR_FLR))
+               prev_sleep_state = ACPI_S5;
+
+       return prev_sleep_state;
+}
+
+void chipset_clear_sleep_state(void)
+{
+       u32 pm1_cnt;
+
+       pm1_cnt = inl(ACPI_BASE_ADDRESS + PM1_CNT);
+       outl(pm1_cnt & ~(SLP_TYP), ACPI_BASE_ADDRESS + PM1_CNT);
+}
+#endif

diff --git a/arch/x86/include/asm/arch-baytrail/iomap.h b/arch/x86/include/asm/arch-baytrail/iomap.h
index 62a9105..ec4e9d5 100644 (file)
--- a/arch/x86/include/asm/arch-baytrail/iomap.h
+++ b/arch/x86/include/asm/arch-baytrail/iomap.h
@@ -35,6 +35,27 @@
 #define PMC_BASE_ADDRESS               0xfed03000
 #define PMC_BASE_SIZE                  0x400
 
+#define GEN_PMCON1                     0x20
+#define  UART_EN                       (1 << 24)
+#define  DISB                          (1 << 23)
+#define  MEM_SR                                (1 << 21)
+#define  SRS                           (1 << 20)
+#define  CTS                           (1 << 19)
+#define  MS4V                          (1 << 18)
+#define  PWR_FLR                       (1 << 16)
+#define  PME_B0_S5_DIS                 (1 << 15)
+#define  SUS_PWR_FLR                   (1 << 14)
+#define  WOL_EN_OVRD                   (1 << 13)
+#define  DIS_SLP_X_STRCH_SUS_UP                (1 << 12)
+#define  GEN_RST_STS                   (1 <<  9)
+#define  RPS                           (1 <<  2)
+#define  AFTERG3_EN                    (1 <<  0)
+#define GEN_PMCON2                     0x24
+#define  SLPSX_STR_POL_LOCK            (1 << 18)
+#define  BIOS_PCI_EXP_EN               (1 << 10)
+#define  PWRBTN_LVL                    (1 <<  9)
+#define  SMI_LOCK                      (1 <<  4)
+
 /* Power Management Unit */
 #define PUNIT_BASE_ADDRESS             0xfed05000
 #define PUNIT_BASE_SIZE                        0x800
@@ -62,6 +83,9 @@
 #define ACPI_BASE_ADDRESS              0x0400
 #define ACPI_BASE_SIZE                 0x80
 
+#define PM1_STS                                0x00
+#define PM1_CNT                                0x04
+
 #define GPIO_BASE_ADDRESS              0x0500
 #define GPIO_BASE_SIZE                 0x100