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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2016 IBM Corporation.
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*/
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#include "ops.h"
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#include "stdio.h"
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#include "io.h"
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#include <libfdt.h>
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#include "../include/asm/opal-api.h"
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/* Global OPAL struct used by opal-call.S */
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struct opal {
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u64 base;
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u64 entry;
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} opal;
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static u32 opal_con_id;
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/* see opal-wrappers.S */
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int64_t opal_console_write(int64_t term_number, u64 *length, const u8 *buffer);
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int64_t opal_console_read(int64_t term_number, uint64_t *length, u8 *buffer);
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int64_t opal_console_write_buffer_space(uint64_t term_number, uint64_t *length);
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int64_t opal_console_flush(uint64_t term_number);
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int64_t opal_poll_events(uint64_t *outstanding_event_mask);
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void opal_kentry(unsigned long fdt_addr, void *vmlinux_addr);
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static int opal_con_open(void)
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{
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/*
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* When OPAL loads the boot kernel it stashes the OPAL base and entry
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* address in r8 and r9 so the kernel can use the OPAL console
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* before unflattening the devicetree. While executing the wrapper will
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* probably trash r8 and r9 so this kentry hook restores them before
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* entering the decompressed kernel.
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*/
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platform_ops.kentry = opal_kentry;
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return 0;
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}
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static void opal_con_putc(unsigned char c)
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{
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int64_t rc;
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uint64_t olen, len;
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do {
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rc = opal_console_write_buffer_space(opal_con_id, &olen);
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len = be64_to_cpu(olen);
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if (rc)
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return;
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opal_poll_events(NULL);
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} while (len < 1);
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olen = cpu_to_be64(1);
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opal_console_write(opal_con_id, &olen, &c);
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}
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static void opal_con_close(void)
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{
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opal_console_flush(opal_con_id);
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}
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static void opal_init(void)
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{
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void *opal_node;
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opal_node = finddevice("/ibm,opal");
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if (!opal_node)
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return;
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if (getprop(opal_node, "opal-base-address", &opal.base, sizeof(u64)) < 0)
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return;
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opal.base = be64_to_cpu(opal.base);
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if (getprop(opal_node, "opal-entry-address", &opal.entry, sizeof(u64)) < 0)
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return;
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opal.entry = be64_to_cpu(opal.entry);
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}
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int opal_console_init(void *devp, struct serial_console_data *scdp)
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{
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opal_init();
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if (devp) {
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int n = getprop(devp, "reg", &opal_con_id, sizeof(u32));
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if (n != sizeof(u32))
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return -1;
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opal_con_id = be32_to_cpu(opal_con_id);
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} else
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opal_con_id = 0;
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scdp->open = opal_con_open;
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scdp->putc = opal_con_putc;
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scdp->close = opal_con_close;
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return 0;
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}
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