mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 08:14:15 +08:00
6b11d1d677
This patch removes the users of the deprectated APIs: acpi_get_table_with_size() early_acpi_os_unmap_memory() The following APIs should be used instead of: acpi_get_table() acpi_put_table() The deprecated APIs are invented to be a replacement of acpi_get_table() during the early stage so that the early mapped pointer will not be stored in ACPICA core and thus the late stage acpi_get_table() won't return a wrong pointer. The mapping size is returned just because it is required by early_acpi_os_unmap_memory() to unmap the pointer during early stage. But as the mapping size equals to the acpi_table_header.length (see acpi_tb_init_table_descriptor() and acpi_tb_validate_table()), when such a convenient result is returned, driver code will start to use it instead of accessing acpi_table_header to obtain the length. Thus this patch cleans up the drivers by replacing returned table size with acpi_table_header.length, and should be a no-op. Reported-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
/*
|
|
* Copyright (c) 2012, Intel Corporation
|
|
* Copyright (c) 2015, Red Hat, Inc.
|
|
* Copyright (c) 2015, 2016 Linaro Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "ACPI: SPCR: " fmt
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/console.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/serial_core.h>
|
|
|
|
/**
|
|
* parse_spcr() - parse ACPI SPCR table and add preferred console
|
|
*
|
|
* @earlycon: set up earlycon for the console specified by the table
|
|
*
|
|
* For the architectures with support for ACPI, CONFIG_ACPI_SPCR_TABLE may be
|
|
* defined to parse ACPI SPCR table. As a result of the parsing preferred
|
|
* console is registered and if @earlycon is true, earlycon is set up.
|
|
*
|
|
* When CONFIG_ACPI_SPCR_TABLE is defined, this function should be called
|
|
* from arch inintialization code as soon as the DT/ACPI decision is made.
|
|
*
|
|
*/
|
|
int __init parse_spcr(bool earlycon)
|
|
{
|
|
static char opts[64];
|
|
struct acpi_table_spcr *table;
|
|
acpi_status status;
|
|
char *uart;
|
|
char *iotype;
|
|
int baud_rate;
|
|
int err;
|
|
|
|
if (acpi_disabled)
|
|
return -ENODEV;
|
|
|
|
status = acpi_get_table(ACPI_SIG_SPCR, 0,
|
|
(struct acpi_table_header **)&table);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
return -ENOENT;
|
|
|
|
if (table->header.revision < 2) {
|
|
err = -ENOENT;
|
|
pr_err("wrong table version\n");
|
|
goto done;
|
|
}
|
|
|
|
iotype = table->serial_port.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY ?
|
|
"mmio" : "io";
|
|
|
|
switch (table->interface_type) {
|
|
case ACPI_DBG2_ARM_SBSA_32BIT:
|
|
iotype = "mmio32";
|
|
/* fall through */
|
|
case ACPI_DBG2_ARM_PL011:
|
|
case ACPI_DBG2_ARM_SBSA_GENERIC:
|
|
case ACPI_DBG2_BCM2835:
|
|
uart = "pl011";
|
|
break;
|
|
case ACPI_DBG2_16550_COMPATIBLE:
|
|
case ACPI_DBG2_16550_SUBSET:
|
|
uart = "uart";
|
|
break;
|
|
default:
|
|
err = -ENOENT;
|
|
goto done;
|
|
}
|
|
|
|
switch (table->baud_rate) {
|
|
case 3:
|
|
baud_rate = 9600;
|
|
break;
|
|
case 4:
|
|
baud_rate = 19200;
|
|
break;
|
|
case 6:
|
|
baud_rate = 57600;
|
|
break;
|
|
case 7:
|
|
baud_rate = 115200;
|
|
break;
|
|
default:
|
|
err = -ENOENT;
|
|
goto done;
|
|
}
|
|
|
|
snprintf(opts, sizeof(opts), "%s,%s,0x%llx,%d", uart, iotype,
|
|
table->serial_port.address, baud_rate);
|
|
|
|
pr_info("console: %s\n", opts);
|
|
|
|
if (earlycon)
|
|
setup_earlycon(opts);
|
|
|
|
err = add_preferred_console(uart, 0, opts + strlen(uart) + 1);
|
|
|
|
done:
|
|
acpi_put_table((struct acpi_table_header *)table);
|
|
return err;
|
|
}
|