linux/drivers/tty/hvc/hvc_opal.c
Sam Mendoza-Jonas 00dab8187e tty/hvc: Use opal irqchip interface if available
Update the hvc driver to use the OPAL irqchip if made available by the
running firmware. If it is not present, the driver falls back to the
existing OPAL event number.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-27 12:38:20 +10:00

426 lines
10 KiB
C

/*
* opal driver interface to hvc_console.c
*
* Copyright 2011 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#undef DEBUG
#include <linux/types.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/console.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <asm/hvconsole.h>
#include <asm/prom.h>
#include <asm/firmware.h>
#include <asm/hvsi.h>
#include <asm/udbg.h>
#include <asm/opal.h>
#include "hvc_console.h"
static const char hvc_opal_name[] = "hvc_opal";
static const struct of_device_id hvc_opal_match[] = {
{ .name = "serial", .compatible = "ibm,opal-console-raw" },
{ .name = "serial", .compatible = "ibm,opal-console-hvsi" },
{ },
};
typedef enum hv_protocol {
HV_PROTOCOL_RAW,
HV_PROTOCOL_HVSI
} hv_protocol_t;
struct hvc_opal_priv {
hv_protocol_t proto; /* Raw data or HVSI packets */
struct hvsi_priv hvsi; /* HVSI specific data */
};
static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
/* For early boot console */
static struct hvc_opal_priv hvc_opal_boot_priv;
static u32 hvc_opal_boot_termno;
static const struct hv_ops hvc_opal_raw_ops = {
.get_chars = opal_get_chars,
.put_chars = opal_put_chars,
.notifier_add = notifier_add_irq,
.notifier_del = notifier_del_irq,
.notifier_hangup = notifier_hangup_irq,
};
static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
{
struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
if (WARN_ON(!pv))
return -ENODEV;
return hvsilib_get_chars(&pv->hvsi, buf, count);
}
static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
{
struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
if (WARN_ON(!pv))
return -ENODEV;
return hvsilib_put_chars(&pv->hvsi, buf, count);
}
static int hvc_opal_hvsi_open(struct hvc_struct *hp, int data)
{
struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
int rc;
pr_devel("HVSI@%x: do open !\n", hp->vtermno);
rc = notifier_add_irq(hp, data);
if (rc)
return rc;
return hvsilib_open(&pv->hvsi, hp);
}
static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
{
struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
pr_devel("HVSI@%x: do close !\n", hp->vtermno);
hvsilib_close(&pv->hvsi, hp);
notifier_del_irq(hp, data);
}
void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
{
struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
pr_devel("HVSI@%x: do hangup !\n", hp->vtermno);
hvsilib_close(&pv->hvsi, hp);
notifier_hangup_irq(hp, data);
}
static int hvc_opal_hvsi_tiocmget(struct hvc_struct *hp)
{
struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
if (!pv)
return -EINVAL;
return pv->hvsi.mctrl;
}
static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
unsigned int clear)
{
struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
hp->vtermno, set, clear);
if (set & TIOCM_DTR)
hvsilib_write_mctrl(&pv->hvsi, 1);
else if (clear & TIOCM_DTR)
hvsilib_write_mctrl(&pv->hvsi, 0);
return 0;
}
static const struct hv_ops hvc_opal_hvsi_ops = {
.get_chars = hvc_opal_hvsi_get_chars,
.put_chars = hvc_opal_hvsi_put_chars,
.notifier_add = hvc_opal_hvsi_open,
.notifier_del = hvc_opal_hvsi_close,
.notifier_hangup = hvc_opal_hvsi_hangup,
.tiocmget = hvc_opal_hvsi_tiocmget,
.tiocmset = hvc_opal_hvsi_tiocmset,
};
static int hvc_opal_probe(struct platform_device *dev)
{
const struct hv_ops *ops;
struct hvc_struct *hp;
struct hvc_opal_priv *pv;
hv_protocol_t proto;
unsigned int termno, irq, boot = 0;
const __be32 *reg;
if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
proto = HV_PROTOCOL_RAW;
ops = &hvc_opal_raw_ops;
} else if (of_device_is_compatible(dev->dev.of_node,
"ibm,opal-console-hvsi")) {
proto = HV_PROTOCOL_HVSI;
ops = &hvc_opal_hvsi_ops;
} else {
pr_err("hvc_opal: Unknown protocol for %s\n",
dev->dev.of_node->full_name);
return -ENXIO;
}
reg = of_get_property(dev->dev.of_node, "reg", NULL);
termno = reg ? be32_to_cpup(reg) : 0;
/* Is it our boot one ? */
if (hvc_opal_privs[termno] == &hvc_opal_boot_priv) {
pv = hvc_opal_privs[termno];
boot = 1;
} else if (hvc_opal_privs[termno] == NULL) {
pv = kzalloc(sizeof(struct hvc_opal_priv), GFP_KERNEL);
if (!pv)
return -ENOMEM;
pv->proto = proto;
hvc_opal_privs[termno] = pv;
if (proto == HV_PROTOCOL_HVSI)
hvsilib_init(&pv->hvsi, opal_get_chars, opal_put_chars,
termno, 0);
/* Instanciate now to establish a mapping index==vtermno */
hvc_instantiate(termno, termno, ops);
} else {
pr_err("hvc_opal: Device %s has duplicate terminal number #%d\n",
dev->dev.of_node->full_name, termno);
return -ENXIO;
}
pr_info("hvc%d: %s protocol on %s%s\n", termno,
proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
dev->dev.of_node->full_name,
boot ? " (boot console)" : "");
irq = irq_of_parse_and_map(dev->dev.of_node, 0);
if (!irq) {
pr_info("hvc%d: No interrupts property, using OPAL event\n",
termno);
irq = opal_event_request(ilog2(OPAL_EVENT_CONSOLE_INPUT));
}
if (!irq) {
pr_err("hvc_opal: Unable to map interrupt for device %s\n",
dev->dev.of_node->full_name);
return irq;
}
hp = hvc_alloc(termno, irq, ops, MAX_VIO_PUT_CHARS);
if (IS_ERR(hp))
return PTR_ERR(hp);
/* hvc consoles on powernv may need to share a single irq */
hp->flags = IRQF_SHARED;
dev_set_drvdata(&dev->dev, hp);
return 0;
}
static int hvc_opal_remove(struct platform_device *dev)
{
struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
int rc, termno;
termno = hp->vtermno;
rc = hvc_remove(hp);
if (rc == 0) {
if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
kfree(hvc_opal_privs[termno]);
hvc_opal_privs[termno] = NULL;
}
return rc;
}
static struct platform_driver hvc_opal_driver = {
.probe = hvc_opal_probe,
.remove = hvc_opal_remove,
.driver = {
.name = hvc_opal_name,
.of_match_table = hvc_opal_match,
}
};
static int __init hvc_opal_init(void)
{
if (!firmware_has_feature(FW_FEATURE_OPAL))
return -ENODEV;
/* Register as a vio device to receive callbacks */
return platform_driver_register(&hvc_opal_driver);
}
device_initcall(hvc_opal_init);
static void udbg_opal_putc(char c)
{
unsigned int termno = hvc_opal_boot_termno;
int count = -1;
if (c == '\n')
udbg_opal_putc('\r');
do {
switch(hvc_opal_boot_priv.proto) {
case HV_PROTOCOL_RAW:
count = opal_put_chars(termno, &c, 1);
break;
case HV_PROTOCOL_HVSI:
count = hvc_opal_hvsi_put_chars(termno, &c, 1);
break;
}
} while(count == 0 || count == -EAGAIN);
}
static int udbg_opal_getc_poll(void)
{
unsigned int termno = hvc_opal_boot_termno;
int rc = 0;
char c;
switch(hvc_opal_boot_priv.proto) {
case HV_PROTOCOL_RAW:
rc = opal_get_chars(termno, &c, 1);
break;
case HV_PROTOCOL_HVSI:
rc = hvc_opal_hvsi_get_chars(termno, &c, 1);
break;
}
if (!rc)
return -1;
return c;
}
static int udbg_opal_getc(void)
{
int ch;
for (;;) {
ch = udbg_opal_getc_poll();
if (ch == -1) {
/* This shouldn't be needed...but... */
volatile unsigned long delay;
for (delay=0; delay < 2000000; delay++)
;
} else {
return ch;
}
}
}
static void udbg_init_opal_common(void)
{
udbg_putc = udbg_opal_putc;
udbg_getc = udbg_opal_getc;
udbg_getc_poll = udbg_opal_getc_poll;
tb_ticks_per_usec = 0x200; /* Make udelay not suck */
}
void __init hvc_opal_init_early(void)
{
struct device_node *stdout_node = of_node_get(of_stdout);
const __be32 *termno;
const struct hv_ops *ops;
u32 index;
/* If the console wasn't in /chosen, try /ibm,opal */
if (!stdout_node) {
struct device_node *opal, *np;
/* Current OPAL takeover doesn't provide the stdout
* path, so we hard wire it
*/
opal = of_find_node_by_path("/ibm,opal/consoles");
if (opal)
pr_devel("hvc_opal: Found consoles in new location\n");
if (!opal) {
opal = of_find_node_by_path("/ibm,opal");
if (opal)
pr_devel("hvc_opal: "
"Found consoles in old location\n");
}
if (!opal)
return;
for_each_child_of_node(opal, np) {
if (!strcmp(np->name, "serial")) {
stdout_node = np;
break;
}
}
of_node_put(opal);
}
if (!stdout_node)
return;
termno = of_get_property(stdout_node, "reg", NULL);
index = termno ? be32_to_cpup(termno) : 0;
if (index >= MAX_NR_HVC_CONSOLES)
return;
hvc_opal_privs[index] = &hvc_opal_boot_priv;
/* Check the protocol */
if (of_device_is_compatible(stdout_node, "ibm,opal-console-raw")) {
hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
ops = &hvc_opal_raw_ops;
pr_devel("hvc_opal: Found RAW console\n");
}
else if (of_device_is_compatible(stdout_node,"ibm,opal-console-hvsi")) {
hvc_opal_boot_priv.proto = HV_PROTOCOL_HVSI;
ops = &hvc_opal_hvsi_ops;
hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars,
opal_put_chars, index, 1);
/* HVSI, perform the handshake now */
hvsilib_establish(&hvc_opal_boot_priv.hvsi);
pr_devel("hvc_opal: Found HVSI console\n");
} else
goto out;
hvc_opal_boot_termno = index;
udbg_init_opal_common();
add_preferred_console("hvc", index, NULL);
hvc_instantiate(index, index, ops);
out:
of_node_put(stdout_node);
}
#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_RAW
void __init udbg_init_debug_opal_raw(void)
{
u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
hvc_opal_privs[index] = &hvc_opal_boot_priv;
hvc_opal_boot_priv.proto = HV_PROTOCOL_RAW;
hvc_opal_boot_termno = index;
udbg_init_opal_common();
}
#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_RAW */
#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI
void __init udbg_init_debug_opal_hvsi(void)
{
u32 index = CONFIG_PPC_EARLY_DEBUG_OPAL_VTERMNO;
hvc_opal_privs[index] = &hvc_opal_boot_priv;
hvc_opal_boot_termno = index;
udbg_init_opal_common();
hvsilib_init(&hvc_opal_boot_priv.hvsi, opal_get_chars, opal_put_chars,
index, 1);
hvsilib_establish(&hvc_opal_boot_priv.hvsi);
}
#endif /* CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI */