// SPDX-License-Identifier: GPL-2.0+
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/*
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* udbg interface to hvc_console.c
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*
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* (C) Copyright David Gibson, IBM Corporation 2008.
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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 <linux/irq.h>
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#include <asm/udbg.h>
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#include "hvc_console.h"
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struct hvc_struct *hvc_udbg_dev;
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static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
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{
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int i;
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for (i = 0; i < count && udbg_putc; i++)
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udbg_putc(buf[i]);
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return i;
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}
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static int hvc_udbg_get(uint32_t vtermno, char *buf, int count)
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{
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int i, c;
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if (!udbg_getc_poll)
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return 0;
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for (i = 0; i < count; i++) {
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if ((c = udbg_getc_poll()) == -1)
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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_udbg_ops = {
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.get_chars = hvc_udbg_get,
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.put_chars = hvc_udbg_put,
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};
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static int __init hvc_udbg_init(void)
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{
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struct hvc_struct *hp;
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if (!udbg_putc)
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return -ENODEV;
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BUG_ON(hvc_udbg_dev);
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hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16);
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if (IS_ERR(hp))
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return PTR_ERR(hp);
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hvc_udbg_dev = hp;
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return 0;
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}
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device_initcall(hvc_udbg_init);
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static int __init hvc_udbg_console_init(void)
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{
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if (!udbg_putc)
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return -ENODEV;
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hvc_instantiate(0, 0, &hvc_udbg_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_udbg_console_init);
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