102 lines
2.4 KiB
C
102 lines
2.4 KiB
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"
|
|
|
|
/* Global OPAL struct used by opal-call.S */
|
|
struct opal {
|
|
u64 base;
|
|
u64 entry;
|
|
} opal;
|
|
|
|
static u32 opal_con_id;
|
|
|
|
/* see opal-wrappers.S */
|
|
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);
|
|
|
|
void opal_kentry(unsigned long fdt_addr, void *vmlinux_addr);
|
|
|
|
static int opal_con_open(void)
|
|
{
|
|
/*
|
|
* When OPAL loads the boot kernel it stashes the OPAL base and entry
|
|
* address in r8 and r9 so the kernel can use the OPAL console
|
|
* before unflattening the devicetree. While executing the wrapper will
|
|
* probably trash r8 and r9 so this kentry hook restores them before
|
|
* entering the decompressed kernel.
|
|
*/
|
|
platform_ops.kentry = opal_kentry;
|
|
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;
|
|
}
|