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https://github.com/u-boot/u-boot.git
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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
// 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 <log.h>
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#include <acpi/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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