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a9f96f014f
Now that the SPDX tag is in all tty files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Jiri Slaby <jslaby@suse.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Chris Metcalf <cmetcalf@mellanox.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* IBM RTAS driver interface to hvc_console.c
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*
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* (C) Copyright IBM Corporation 2001-2005
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* (C) Copyright Red Hat, Inc. 2005
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*
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* Author(s): Maximino Augilar <IBM STI Design Center>
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* : Ryan S. Arnold <rsa@us.ibm.com>
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* : Utz Bacher <utz.bacher@de.ibm.com>
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* : David Woodhouse <dwmw2@infradead.org>
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*
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* inspired by drivers/char/hvc_console.c
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* written by Anton Blanchard and Paul Mackerras
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*/
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <asm/irq.h>
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#include <asm/rtas.h>
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#include "hvc_console.h"
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#define hvc_rtas_cookie 0x67781e15
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struct hvc_struct *hvc_rtas_dev;
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static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
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static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
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static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf,
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int count)
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{
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int i;
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for (i = 0; i < count; i++) {
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if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i]))
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break;
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}
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return i;
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}
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static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
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{
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int i, c;
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for (i = 0; i < count; i++) {
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if (rtas_call(rtascons_get_char_token, 0, 2, &c))
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break;
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buf[i] = c;
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}
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return i;
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}
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static const struct hv_ops hvc_rtas_get_put_ops = {
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.get_chars = hvc_rtas_read_console,
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.put_chars = hvc_rtas_write_console,
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};
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static int __init hvc_rtas_init(void)
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{
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struct hvc_struct *hp;
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if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
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rtascons_put_char_token = rtas_token("put-term-char");
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if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
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return -EIO;
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if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
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rtascons_get_char_token = rtas_token("get-term-char");
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if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
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return -EIO;
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BUG_ON(hvc_rtas_dev);
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/* Allocate an hvc_struct for the console device we instantiated
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* earlier. Save off hp so that we can return it on exit */
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hp = hvc_alloc(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops, 16);
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if (IS_ERR(hp))
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return PTR_ERR(hp);
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hvc_rtas_dev = hp;
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return 0;
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}
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device_initcall(hvc_rtas_init);
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/* This will happen prior to module init. There is no tty at this time? */
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static int __init hvc_rtas_console_init(void)
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{
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rtascons_put_char_token = rtas_token("put-term-char");
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if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
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return -EIO;
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rtascons_get_char_token = rtas_token("get-term-char");
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if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
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return -EIO;
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hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops);
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add_preferred_console("hvc", 0, NULL);
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return 0;
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}
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console_initcall(hvc_rtas_console_init);
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