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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | // SPDX-License-Identifier: GPL-2.0+ /* * IBM RTAS driver interface to hvc_console.c * * (C) Copyright IBM Corporation 2001-2005 * (C) Copyright Red Hat, Inc. 2005 * * Author(s): Maximino Augilar <IBM STI Design Center> * : Ryan S. Arnold <rsa@us.ibm.com> * : Utz Bacher <utz.bacher@de.ibm.com> * : David Woodhouse <dwmw2@infradead.org> * * inspired by drivers/char/hvc_console.c * written by Anton Blanchard and Paul Mackerras */ #include <linux/console.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/init.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <asm/irq.h> #include <asm/rtas.h> #include "hvc_console.h" #define hvc_rtas_cookie 0x67781e15 struct hvc_struct *hvc_rtas_dev; static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE; static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE; static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf, int count) { int i; for (i = 0; i < count; i++) { if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i])) break; } return i; } static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count) { int i, c; for (i = 0; i < count; i++) { if (rtas_call(rtascons_get_char_token, 0, 2, &c)) break; buf[i] = c; } return i; } static const struct hv_ops hvc_rtas_get_put_ops = { .get_chars = hvc_rtas_read_console, .put_chars = hvc_rtas_write_console, }; static int __init hvc_rtas_init(void) { struct hvc_struct *hp; if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE) rtascons_put_char_token = rtas_token("put-term-char"); if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE) return -EIO; if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE) rtascons_get_char_token = rtas_token("get-term-char"); if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE) return -EIO; BUG_ON(hvc_rtas_dev); /* Allocate an hvc_struct for the console device we instantiated * earlier. Save off hp so that we can return it on exit */ hp = hvc_alloc(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops, 16); if (IS_ERR(hp)) return PTR_ERR(hp); hvc_rtas_dev = hp; return 0; } device_initcall(hvc_rtas_init); /* This will happen prior to module init. There is no tty at this time? */ static int __init hvc_rtas_console_init(void) { rtascons_put_char_token = rtas_token("put-term-char"); if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE) return -EIO; rtascons_get_char_token = rtas_token("get-term-char"); if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE) return -EIO; hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops); add_preferred_console("hvc", 0, NULL); return 0; } console_initcall(hvc_rtas_console_init); |