420 lines
10 KiB
C
420 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* opal driver interface to hvc_console.c
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*
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* Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
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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 <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/export.h>
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#include <linux/interrupt.h>
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#include <asm/hvconsole.h>
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#include <asm/firmware.h>
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#include <asm/hvsi.h>
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#include <asm/udbg.h>
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#include <asm/opal.h>
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#include "hvc_console.h"
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static const char hvc_opal_name[] = "hvc_opal";
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static const struct of_device_id hvc_opal_match[] = {
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{ .name = "serial", .compatible = "ibm,opal-console-raw" },
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{ .name = "serial", .compatible = "ibm,opal-console-hvsi" },
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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 hvc_opal_priv {
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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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};
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static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
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/* For early boot console */
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static struct hvc_opal_priv hvc_opal_boot_priv;
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static u32 hvc_opal_boot_termno;
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static const struct hv_ops hvc_opal_raw_ops = {
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.get_chars = opal_get_chars,
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.put_chars = opal_put_chars,
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.flush = opal_flush_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 hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
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{
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struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
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if (WARN_ON(!pv))
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return -ENODEV;
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return hvsilib_get_chars(&pv->hvsi, buf, count);
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}
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static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
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{
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struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
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if (WARN_ON(!pv))
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return -ENODEV;
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return hvsilib_put_chars(&pv->hvsi, buf, count);
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}
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static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
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{
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struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
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int rc;
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pr_devel("HVSI@%x: do open !\n", hp->vtermno);
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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 hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
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{
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struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
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pr_devel("HVSI@%x: do close !\n", hp->vtermno);
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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 hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
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{
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struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
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pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);
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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 hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
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{
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struct hvc_opal_priv *pv = hvc_opal_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 hvc_opal_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 hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
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pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
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hp->vtermno, 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 hvc_opal_hvsi_ops = {
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.get_chars = hvc_opal_hvsi_get_chars,
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.put_chars = hvc_opal_hvsi_put_chars,
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.flush = opal_flush_chars,
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.notifier_add = hvc_opal_hvsi_open,
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.notifier_del = hvc_opal_hvsi_close,
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.notifier_hangup = hvc_opal_hvsi_hangup,
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.tiocmget = hvc_opal_hvsi_tiocmget,
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.tiocmset = hvc_opal_hvsi_tiocmset,
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};
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static int hvc_opal_probe(struct platform_device *dev)
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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 hvc_opal_priv *pv;
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hv_protocol_t proto;
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unsigned int termno, irq, boot = 0;
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const __be32 *reg;
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if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
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proto = HV_PROTOCOL_RAW;
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ops = &hvc_opal_raw_ops;
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} else if (of_device_is_compatible(dev->dev.of_node,
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"ibm,opal-console-hvsi")) {
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proto = HV_PROTOCOL_HVSI;
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ops = &hvc_opal_hvsi_ops;
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} else {
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pr_err("hvc_opal: Unknown protocol for %pOF\n",
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dev->dev.of_node);
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return -ENXIO;
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}
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reg = of_get_property(dev->dev.of_node, "reg", NULL);
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termno = reg ? be32_to_cpup(reg) : 0;
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/* Is it our boot one ? */
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if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
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pv = hvc_opal_privs[termno];
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boot = 1;
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} else if (hvc_opal_privs[termno] == NULL) {
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pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
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if (!pv)
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return -ENOMEM;
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pv->proto = proto;
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hvc_opal_privs[termno] = pv;
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if (proto == HV_PROTOCOL_HVSI) {
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/*
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* We want put_chars to be atomic to avoid mangling of
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* hvsi packets.
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*/
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hvsilib_init(&pv->hvsi,
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opal_get_chars, opal_put_chars_atomic,
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termno, 0);
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}
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/* Instanciate now to establish a mapping index==vtermno */
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hvc_instantiate(termno, termno, ops);
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} else {
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pr_err("hvc_opal: Device %pOF has duplicate terminal number #%d\n",
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dev->dev.of_node, termno);
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return -ENXIO;
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}
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pr_info("hvc%d: %s protocol on %pOF%s\n", termno,
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proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
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dev->dev.of_node,
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boot ? " (boot console)" : "");
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irq = irq_of_parse_and_map(dev->dev.of_node, 0);
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if (!irq) {
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pr_info("hvc%d: No interrupts property, using OPAL event\n",
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termno);
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irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
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}
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if (!irq) {
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pr_err("hvc_opal: Unable to map interrupt for device %pOF\n",
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dev->dev.of_node);
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return irq;
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}
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hp = hvc_alloc(termno, 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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/* hvc consoles on powernv may need to share a single irq */
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hp->flags = IRQF_SHARED;
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dev_set_drvdata(&dev->dev, hp);
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return 0;
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}
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static int hvc_opal_remove(struct platform_device *dev)
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{
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struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
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int rc, termno;
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termno = hp->vtermno;
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rc = hvc_remove(hp);
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if (rc == 0) {
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if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
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kfree(hvc_opal_privs[termno]);
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hvc_opal_privs[termno] = NULL;
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}
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return rc;
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}
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static struct platform_driver hvc_opal_driver = {
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.probe = hvc_opal_probe,
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.remove = hvc_opal_remove,
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.driver = {
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.name = hvc_opal_name,
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.of_match_table = hvc_opal_match,
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}
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};
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static int __init hvc_opal_init(void)
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{
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if (!firmware_has_feature(FW_FEATURE_OPAL))
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return -ENODEV;
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/* Register as a vio device to receive callbacks */
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return platform_driver_register(&hvc_opal_driver);
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}
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device_initcall(hvc_opal_init);
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static void udbg_opal_putc(char c)
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{
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unsigned int termno = hvc_opal_boot_termno;
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int count = -1;
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if (c == '\n')
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udbg_opal_putc('\r');
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do {
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switch(hvc_opal_boot_priv.proto) {
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case HV_PROTOCOL_RAW:
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count = opal_put_chars(termno, &c, 1);
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break;
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case HV_PROTOCOL_HVSI:
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count = hvc_opal_hvsi_put_chars(termno, &c, 1);
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break;
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}
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/* This is needed for the cosole to flush
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* when there aren't any interrupts.
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*/
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opal_flush_console(termno);
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} while(count == 0 || count == -EAGAIN);
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}
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static int udbg_opal_getc_poll(void)
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{
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unsigned int termno = hvc_opal_boot_termno;
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int rc = 0;
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char c;
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switch(hvc_opal_boot_priv.proto) {
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case HV_PROTOCOL_RAW:
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rc = opal_get_chars(termno, &c, 1);
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break;
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case HV_PROTOCOL_HVSI:
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rc = hvc_opal_hvsi_get_chars(termno, &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_opal_getc(void)
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{
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int ch;
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for (;;) {
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ch = udbg_opal_getc_poll();
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if (ch != -1)
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return ch;
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}
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}
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static void udbg_init_opal_common(void)
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{
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udbg_putc = udbg_opal_putc;
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udbg_getc = udbg_opal_getc;
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udbg_getc_poll = udbg_opal_getc_poll;
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}
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void __init hvc_opal_init_early(void)
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{
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struct device_node *stdout_node = of_node_get(of_stdout);
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const __be32 *termno;
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const struct hv_ops *ops;
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u32 index;
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/* If the console wasn't in /chosen, try /ibm,opal */
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if (!stdout_node) {
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struct device_node *opal, *np;
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/* Current OPAL takeover doesn't provide the stdout
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* path, so we hard wire it
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*/
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opal = of_find_node_by_path("/ibm,opal/consoles");
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if (opal) {
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pr_devel("hvc_opal: Found consoles in new location\n");
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} else {
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opal = of_find_node_by_path("/ibm,opal");
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if (opal)
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pr_devel("hvc_opal: "
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"Found consoles in old location\n");
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}
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if (!opal)
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return;
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for_each_child_of_node(opal, np) {
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if (of_node_name_eq(np, "serial")) {
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stdout_node = np;
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break;
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}
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}
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of_node_put(opal);
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}
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if (!stdout_node)
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return;
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termno = of_get_property(stdout_node, "reg", NULL);
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index = termno ? be32_to_cpup(termno) : 0;
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if (index >= MAX_NR_HVC_CONSOLES)
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return;
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hvc_opal_privs[index] = &hvc_opal_boot_priv;
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/* Check the protocol */
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if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
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hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
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ops = &hvc_opal_raw_ops;
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pr_devel("hvc_opal: Found RAW console\n");
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}
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else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
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hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
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ops = &hvc_opal_hvsi_ops;
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hvsilib_init(&hvc_opal_boot_priv.hvsi,
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opal_get_chars, opal_put_chars_atomic,
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index, 1);
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/* HVSI, perform the handshake now */
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hvsilib_establish(&hvc_opal_boot_priv.hvsi);
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pr_devel("hvc_opal: Found HVSI console\n");
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} else
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goto out;
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hvc_opal_boot_termno = index;
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udbg_init_opal_common();
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add_preferred_console("hvc", index, NULL);
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hvc_instantiate(index, index, ops);
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out:
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of_node_put(stdout_node);
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}
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#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
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void __init udbg_init_debug_opal_raw(void)
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{
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u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
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hvc_opal_privs[index] = &hvc_opal_boot_priv;
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hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
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hvc_opal_boot_termno = index;
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udbg_init_opal_common();
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}
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#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */
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#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
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void __init udbg_init_debug_opal_hvsi(void)
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{
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u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
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hvc_opal_privs[index] = &hvc_opal_boot_priv;
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hvc_opal_boot_termno = index;
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udbg_init_opal_common();
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hvsilib_init(&hvc_opal_boot_priv.hvsi,
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opal_get_chars, opal_put_chars_atomic,
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index, 1);
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hvsilib_establish(&hvc_opal_boot_priv.hvsi);
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}
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#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */
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