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110 lines
2.7 KiB
110 lines
2.7 KiB
// 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 <[email protected]> |
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* : Utz Bacher <[email protected]> |
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* : David Woodhouse <[email protected]> |
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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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