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473 lines
11 KiB
473 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* vio driver interface to hvc_console.c |
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* |
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* This code was moved here to allow the remaining code to be reused as a |
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* generic polling mode with semi-reliable transport driver core to the |
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* console and tty subsystems. |
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* |
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* |
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* Copyright (C) 2001 Anton Blanchard <[email protected]>, IBM |
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* Copyright (C) 2001 Paul Mackerras <[email protected]>, IBM |
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* Copyright (C) 2004 Benjamin Herrenschmidt <[email protected]>, IBM Corp. |
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* Copyright (C) 2004 IBM Corporation |
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* |
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* Additional Author(s): |
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* Ryan S. Arnold <[email protected]> |
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* |
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* TODO: |
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* |
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* - handle error in sending hvsi protocol packets |
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* - retry nego on subsequent sends ? |
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*/ |
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#undef DEBUG |
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/console.h> |
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#include <asm/hvconsole.h> |
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#include <asm/vio.h> |
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#include <asm/prom.h> |
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#include <asm/hvsi.h> |
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#include <asm/udbg.h> |
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#include <asm/machdep.h> |
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#include "hvc_console.h" |
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static const char hvc_driver_name[] = "hvc_console"; |
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static const struct vio_device_id hvc_driver_table[] = { |
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{"serial", "hvterm1"}, |
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#ifndef HVC_OLD_HVSI |
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{"serial", "hvterm-protocol"}, |
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#endif |
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{ "", "" } |
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}; |
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typedef enum hv_protocol { |
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HV_PROTOCOL_RAW, |
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HV_PROTOCOL_HVSI |
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} hv_protocol_t; |
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struct hvterm_priv { |
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u32 termno; /* HV term number */ |
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hv_protocol_t proto; /* Raw data or HVSI packets */ |
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struct hvsi_priv hvsi; /* HVSI specific data */ |
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spinlock_t buf_lock; |
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char buf[SIZE_VIO_GET_CHARS]; |
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int left; |
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int offset; |
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}; |
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static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES]; |
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/* For early boot console */ |
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static struct hvterm_priv hvterm_priv0; |
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static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[vtermno]; |
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unsigned long i; |
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unsigned long flags; |
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int got; |
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if (WARN_ON(!pv)) |
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return 0; |
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spin_lock_irqsave(&pv->buf_lock, flags); |
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if (pv->left == 0) { |
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pv->offset = 0; |
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pv->left = hvc_get_chars(pv->termno, pv->buf, count); |
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/* |
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* Work around a HV bug where it gives us a null |
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* after every \r. -- paulus |
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*/ |
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for (i = 1; i < pv->left; ++i) { |
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if (pv->buf[i] == 0 && pv->buf[i-1] == '\r') { |
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--pv->left; |
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if (i < pv->left) { |
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memmove(&pv->buf[i], &pv->buf[i+1], |
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pv->left - i); |
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} |
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} |
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} |
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} |
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got = min(count, pv->left); |
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memcpy(buf, &pv->buf[pv->offset], got); |
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pv->offset += got; |
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pv->left -= got; |
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spin_unlock_irqrestore(&pv->buf_lock, flags); |
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return got; |
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} |
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/** |
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* hvterm_raw_put_chars: send characters to firmware for given vterm adapter |
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* @vtermno: The virtual terminal number. |
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* @buf: The characters to send. Because of the underlying hypercall in |
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* hvc_put_chars(), this buffer must be at least 16 bytes long, even if |
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* you are sending fewer chars. |
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* @count: number of chars to send. |
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*/ |
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static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[vtermno]; |
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if (WARN_ON(!pv)) |
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return 0; |
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return hvc_put_chars(pv->termno, buf, count); |
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} |
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static const struct hv_ops hvterm_raw_ops = { |
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.get_chars = hvterm_raw_get_chars, |
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.put_chars = hvterm_raw_put_chars, |
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.notifier_add = notifier_add_irq, |
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.notifier_del = notifier_del_irq, |
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.notifier_hangup = notifier_hangup_irq, |
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}; |
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static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[vtermno]; |
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if (WARN_ON(!pv)) |
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return 0; |
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return hvsilib_get_chars(&pv->hvsi, buf, count); |
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} |
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static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[vtermno]; |
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if (WARN_ON(!pv)) |
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return 0; |
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return hvsilib_put_chars(&pv->hvsi, buf, count); |
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} |
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static int hvterm_hvsi_open(struct hvc_struct *hp, int data) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
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int rc; |
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pr_devel("HVSI@%x: open !\n", pv->termno); |
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rc = notifier_add_irq(hp, data); |
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if (rc) |
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return rc; |
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return hvsilib_open(&pv->hvsi, hp); |
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} |
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static void hvterm_hvsi_close(struct hvc_struct *hp, int data) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
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pr_devel("HVSI@%x: do close !\n", pv->termno); |
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hvsilib_close(&pv->hvsi, hp); |
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notifier_del_irq(hp, data); |
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} |
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static void hvterm_hvsi_hangup(struct hvc_struct *hp, int data) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
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pr_devel("HVSI@%x: do hangup !\n", pv->termno); |
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hvsilib_close(&pv->hvsi, hp); |
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notifier_hangup_irq(hp, data); |
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} |
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static int hvterm_hvsi_tiocmget(struct hvc_struct *hp) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
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if (!pv) |
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return -EINVAL; |
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return pv->hvsi.mctrl; |
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} |
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static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set, |
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unsigned int clear) |
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{ |
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno]; |
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pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n", |
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pv->termno, set, clear); |
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if (set & TIOCM_DTR) |
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hvsilib_write_mctrl(&pv->hvsi, 1); |
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else if (clear & TIOCM_DTR) |
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hvsilib_write_mctrl(&pv->hvsi, 0); |
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return 0; |
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} |
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static const struct hv_ops hvterm_hvsi_ops = { |
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.get_chars = hvterm_hvsi_get_chars, |
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.put_chars = hvterm_hvsi_put_chars, |
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.notifier_add = hvterm_hvsi_open, |
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.notifier_del = hvterm_hvsi_close, |
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.notifier_hangup = hvterm_hvsi_hangup, |
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.tiocmget = hvterm_hvsi_tiocmget, |
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.tiocmset = hvterm_hvsi_tiocmset, |
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}; |
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static void udbg_hvc_putc(char c) |
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{ |
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int count = -1; |
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unsigned char bounce_buffer[16]; |
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if (!hvterm_privs[0]) |
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return; |
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if (c == '\n') |
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udbg_hvc_putc('\r'); |
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do { |
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switch(hvterm_privs[0]->proto) { |
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case HV_PROTOCOL_RAW: |
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/* |
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* hvterm_raw_put_chars requires at least a 16-byte |
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* buffer, so go via the bounce buffer |
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*/ |
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bounce_buffer[0] = c; |
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count = hvterm_raw_put_chars(0, bounce_buffer, 1); |
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break; |
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case HV_PROTOCOL_HVSI: |
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count = hvterm_hvsi_put_chars(0, &c, 1); |
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break; |
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} |
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} while (count == 0 || count == -EAGAIN); |
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} |
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static int udbg_hvc_getc_poll(void) |
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{ |
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int rc = 0; |
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char c; |
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if (!hvterm_privs[0]) |
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return -1; |
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switch(hvterm_privs[0]->proto) { |
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case HV_PROTOCOL_RAW: |
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rc = hvterm_raw_get_chars(0, &c, 1); |
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break; |
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case HV_PROTOCOL_HVSI: |
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rc = hvterm_hvsi_get_chars(0, &c, 1); |
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break; |
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} |
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if (!rc) |
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return -1; |
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return c; |
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} |
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static int udbg_hvc_getc(void) |
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{ |
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int ch; |
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if (!hvterm_privs[0]) |
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return -1; |
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for (;;) { |
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ch = udbg_hvc_getc_poll(); |
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if (ch == -1) { |
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/* This shouldn't be needed...but... */ |
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volatile unsigned long delay; |
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for (delay=0; delay < 2000000; delay++) |
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; |
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} else { |
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return ch; |
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} |
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} |
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} |
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static int hvc_vio_probe(struct vio_dev *vdev, |
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const struct vio_device_id *id) |
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{ |
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const struct hv_ops *ops; |
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struct hvc_struct *hp; |
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struct hvterm_priv *pv; |
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hv_protocol_t proto; |
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int i, termno = -1; |
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/* probed with invalid parameters. */ |
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if (!vdev || !id) |
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return -EPERM; |
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if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) { |
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proto = HV_PROTOCOL_RAW; |
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ops = &hvterm_raw_ops; |
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} else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) { |
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proto = HV_PROTOCOL_HVSI; |
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ops = &hvterm_hvsi_ops; |
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} else { |
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pr_err("hvc_vio: Unknown protocol for %pOF\n", vdev->dev.of_node); |
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return -ENXIO; |
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} |
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pr_devel("hvc_vio_probe() device %pOF, using %s protocol\n", |
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vdev->dev.of_node, |
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proto == HV_PROTOCOL_RAW ? "raw" : "hvsi"); |
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/* Is it our boot one ? */ |
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if (hvterm_privs[0] == &hvterm_priv0 && |
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vdev->unit_address == hvterm_priv0.termno) { |
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pv = hvterm_privs[0]; |
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termno = 0; |
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pr_devel("->boot console, using termno 0\n"); |
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} |
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/* nope, allocate a new one */ |
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else { |
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for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++) |
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if (!hvterm_privs[i]) |
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termno = i; |
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pr_devel("->non-boot console, using termno %d\n", termno); |
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if (termno < 0) |
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return -ENODEV; |
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pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL); |
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if (!pv) |
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return -ENOMEM; |
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pv->termno = vdev->unit_address; |
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pv->proto = proto; |
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spin_lock_init(&pv->buf_lock); |
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hvterm_privs[termno] = pv; |
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hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars, |
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pv->termno, 0); |
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} |
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hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS); |
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if (IS_ERR(hp)) |
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return PTR_ERR(hp); |
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dev_set_drvdata(&vdev->dev, hp); |
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/* register udbg if it's not there already for console 0 */ |
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if (hp->index == 0 && !udbg_putc) { |
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udbg_putc = udbg_hvc_putc; |
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udbg_getc = udbg_hvc_getc; |
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udbg_getc_poll = udbg_hvc_getc_poll; |
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} |
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return 0; |
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} |
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static struct vio_driver hvc_vio_driver = { |
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.id_table = hvc_driver_table, |
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.probe = hvc_vio_probe, |
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.name = hvc_driver_name, |
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.driver = { |
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.suppress_bind_attrs = true, |
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}, |
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}; |
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static int __init hvc_vio_init(void) |
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{ |
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int rc; |
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/* Register as a vio device to receive callbacks */ |
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rc = vio_register_driver(&hvc_vio_driver); |
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return rc; |
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} |
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device_initcall(hvc_vio_init); /* after drivers/tty/hvc/hvc_console.c */ |
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void __init hvc_vio_init_early(void) |
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{ |
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const __be32 *termno; |
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const struct hv_ops *ops; |
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/* find the boot console from /chosen/stdout */ |
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/* Check if it's a virtual terminal */ |
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if (!of_node_name_prefix(of_stdout, "vty")) |
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return; |
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termno = of_get_property(of_stdout, "reg", NULL); |
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if (termno == NULL) |
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return; |
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hvterm_priv0.termno = of_read_number(termno, 1); |
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spin_lock_init(&hvterm_priv0.buf_lock); |
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hvterm_privs[0] = &hvterm_priv0; |
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/* Check the protocol */ |
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if (of_device_is_compatible(of_stdout, "hvterm1")) { |
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hvterm_priv0.proto = HV_PROTOCOL_RAW; |
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ops = &hvterm_raw_ops; |
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} |
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else if (of_device_is_compatible(of_stdout, "hvterm-protocol")) { |
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hvterm_priv0.proto = HV_PROTOCOL_HVSI; |
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ops = &hvterm_hvsi_ops; |
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hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars, |
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hvterm_priv0.termno, 1); |
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/* HVSI, perform the handshake now */ |
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hvsilib_establish(&hvterm_priv0.hvsi); |
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} else |
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return; |
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udbg_putc = udbg_hvc_putc; |
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udbg_getc = udbg_hvc_getc; |
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udbg_getc_poll = udbg_hvc_getc_poll; |
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#ifdef HVC_OLD_HVSI |
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/* When using the old HVSI driver don't register the HVC |
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* backend for HVSI, only do udbg |
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*/ |
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if (hvterm_priv0.proto == HV_PROTOCOL_HVSI) |
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return; |
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#endif |
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/* Check whether the user has requested a different console. */ |
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if (!strstr(boot_command_line, "console=")) |
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add_preferred_console("hvc", 0, NULL); |
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hvc_instantiate(0, 0, ops); |
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} |
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/* call this from early_init() for a working debug console on |
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* vterm capable LPAR machines |
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*/ |
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#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR |
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void __init udbg_init_debug_lpar(void) |
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{ |
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/* |
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* If we're running as a hypervisor then we definitely can't call the |
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* hypervisor to print debug output (we *are* the hypervisor), so don't |
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* register if we detect that MSR_HV=1. |
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*/ |
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if (mfmsr() & MSR_HV) |
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return; |
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hvterm_privs[0] = &hvterm_priv0; |
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hvterm_priv0.termno = 0; |
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hvterm_priv0.proto = HV_PROTOCOL_RAW; |
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spin_lock_init(&hvterm_priv0.buf_lock); |
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udbg_putc = udbg_hvc_putc; |
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udbg_getc = udbg_hvc_getc; |
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udbg_getc_poll = udbg_hvc_getc_poll; |
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} |
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#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */ |
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#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI |
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void __init udbg_init_debug_lpar_hvsi(void) |
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{ |
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/* See comment above in udbg_init_debug_lpar() */ |
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if (mfmsr() & MSR_HV) |
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return; |
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hvterm_privs[0] = &hvterm_priv0; |
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hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO; |
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hvterm_priv0.proto = HV_PROTOCOL_HVSI; |
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spin_lock_init(&hvterm_priv0.buf_lock); |
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udbg_putc = udbg_hvc_putc; |
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udbg_getc = udbg_hvc_getc; |
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udbg_getc_poll = udbg_hvc_getc_poll; |
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hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars, |
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hvterm_priv0.termno, 1); |
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hvsilib_establish(&hvterm_priv0.hvsi); |
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} |
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#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */
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