https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 9395452b4aab7bc2475ef8935b4a4fb99d778d70 authored by Linus Torvalds on 12 September 2016, 03:02:25 UTC
Linux 4.8-rc6
Linux 4.8-rc6
Tip revision: 9395452
opal.c
/*
* Copyright (c) 2016 IBM Corporation.
*
* 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; either version
* 2 of the License, or (at your option) any later version.
*/
#include "ops.h"
#include "stdio.h"
#include "io.h"
#include <libfdt.h>
#include "../include/asm/opal-api.h"
#ifdef __powerpc64__
/* Global OPAL struct used by opal-call.S */
struct opal {
u64 base;
u64 entry;
} opal;
static u32 opal_con_id;
int64_t opal_console_write(int64_t term_number, u64 *length, const u8 *buffer);
int64_t opal_console_read(int64_t term_number, uint64_t *length, u8 *buffer);
int64_t opal_console_write_buffer_space(uint64_t term_number, uint64_t *length);
int64_t opal_console_flush(uint64_t term_number);
int64_t opal_poll_events(uint64_t *outstanding_event_mask);
static int opal_con_open(void)
{
return 0;
}
static void opal_con_putc(unsigned char c)
{
int64_t rc;
uint64_t olen, len;
do {
rc = opal_console_write_buffer_space(opal_con_id, &olen);
len = be64_to_cpu(olen);
if (rc)
return;
opal_poll_events(NULL);
} while (len < 1);
olen = cpu_to_be64(1);
opal_console_write(opal_con_id, &olen, &c);
}
static void opal_con_close(void)
{
opal_console_flush(opal_con_id);
}
static void opal_init(void)
{
void *opal_node;
opal_node = finddevice("/ibm,opal");
if (!opal_node)
return;
if (getprop(opal_node, "opal-base-address", &opal.base, sizeof(u64)) < 0)
return;
opal.base = be64_to_cpu(opal.base);
if (getprop(opal_node, "opal-entry-address", &opal.entry, sizeof(u64)) < 0)
return;
opal.entry = be64_to_cpu(opal.entry);
}
int opal_console_init(void *devp, struct serial_console_data *scdp)
{
opal_init();
if (devp) {
int n = getprop(devp, "reg", &opal_con_id, sizeof(u32));
if (n != sizeof(u32))
return -1;
opal_con_id = be32_to_cpu(opal_con_id);
} else
opal_con_id = 0;
scdp->open = opal_con_open;
scdp->putc = opal_con_putc;
scdp->close = opal_con_close;
return 0;
}
#else
int opal_console_init(void *devp, struct serial_console_data *scdp)
{
return -1;
}
#endif /* __powerpc64__ */