mirror of
https://github.com/AsahiLinux/u-boot
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109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <asm/acpi_table.h>
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#include <asm/io.h>
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#include <asm/tables.h>
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static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp)
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{
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if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
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return NULL;
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debug("Looking on %p for valid checksum\n", rsdp);
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if (table_compute_checksum((void *)rsdp, 20) != 0)
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return NULL;
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debug("acpi rsdp checksum 1 passed\n");
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if ((rsdp->revision > 1) &&
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(table_compute_checksum((void *)rsdp, rsdp->length) != 0))
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return NULL;
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debug("acpi rsdp checksum 2 passed\n");
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return rsdp;
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}
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struct acpi_fadt *acpi_find_fadt(void)
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{
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char *p, *end;
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struct acpi_rsdp *rsdp = NULL;
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struct acpi_rsdt *rsdt;
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struct acpi_fadt *fadt = NULL;
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int i;
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/* Find RSDP */
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for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) {
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rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p);
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if (rsdp)
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break;
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}
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if (!rsdp)
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return NULL;
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debug("RSDP found at %p\n", rsdp);
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rsdt = (struct acpi_rsdt *)(uintptr_t)rsdp->rsdt_address;
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end = (char *)rsdt + rsdt->header.length;
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debug("RSDT found at %p ends at %p\n", rsdt, end);
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for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) {
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fadt = (struct acpi_fadt *)(uintptr_t)rsdt->entry[i];
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if (strncmp((char *)fadt, "FACP", 4) == 0)
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break;
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fadt = NULL;
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}
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if (!fadt)
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return NULL;
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debug("FADT found at %p\n", fadt);
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return fadt;
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}
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void *acpi_find_wakeup_vector(struct acpi_fadt *fadt)
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{
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struct acpi_facs *facs;
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void *wake_vec;
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debug("Trying to find the wakeup vector...\n");
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facs = (struct acpi_facs *)(uintptr_t)fadt->firmware_ctrl;
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if (!facs) {
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debug("No FACS found, wake up from S3 not possible.\n");
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return NULL;
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}
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debug("FACS found at %p\n", facs);
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wake_vec = (void *)(uintptr_t)facs->firmware_waking_vector;
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debug("OS waking vector is %p\n", wake_vec);
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return wake_vec;
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}
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void enter_acpi_mode(int pm1_cnt)
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{
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u16 val = inw(pm1_cnt);
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/*
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* PM1_CNT register bit0 selects the power management event to be
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* either an SCI or SMI interrupt. When this bit is set, then power
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* management events will generate an SCI interrupt. When this bit
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* is reset power management events will generate an SMI interrupt.
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*
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* Per ACPI spec, it is the responsibility of the hardware to set
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* or reset this bit. OSPM always preserves this bit position.
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*
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* U-Boot does not support SMI. And we don't have plan to support
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* anything running in SMM within U-Boot. To create a legacy-free
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* system, and expose ourselves to OSPM as working under ACPI mode
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* already, turn this bit on.
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*/
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outw(val | PM1_CNT_SCI_EN, pm1_cnt);
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}
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