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path: root/drivers/tty/hvc/hvc_opal.c
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Diffstat (limited to 'drivers/tty/hvc/hvc_opal.c')
-rw-r--r--drivers/tty/hvc/hvc_opal.c98
1 files changed, 45 insertions, 53 deletions
diff --git a/drivers/tty/hvc/hvc_opal.c b/drivers/tty/hvc/hvc_opal.c
index 510799311099..b2ec1f6efa0a 100644
--- a/drivers/tty/hvc/hvc_opal.c
+++ b/drivers/tty/hvc/hvc_opal.c
@@ -1,22 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
/*
* 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
@@ -27,12 +13,12 @@
#include <linux/slab.h>
#include <linux/console.h>
#include <linux/of.h>
-#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.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>
@@ -66,12 +52,13 @@ 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,
+ .flush = opal_flush_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)
+static ssize_t hvc_opal_hvsi_get_chars(uint32_t vtermno, u8 *buf, size_t count)
{
struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
@@ -81,7 +68,8 @@ static int hvc_opal_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
return hvsilib_get_chars(&pv->hvsi, buf, count);
}
-static int hvc_opal_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
+static ssize_t hvc_opal_hvsi_put_chars(uint32_t vtermno, const u8 *buf,
+ size_t count)
{
struct hvc_opal_priv *pv = hvc_opal_privs[vtermno];
@@ -116,7 +104,7 @@ static void hvc_opal_hvsi_close(struct hvc_struct *hp, int data)
notifier_del_irq(hp, data);
}
-void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
+static void hvc_opal_hvsi_hangup(struct hvc_struct *hp, int data)
{
struct hvc_opal_priv *pv = hvc_opal_privs[hp->vtermno];
@@ -155,6 +143,7 @@ static int hvc_opal_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
static const struct hv_ops hvc_opal_hvsi_ops = {
.get_chars = hvc_opal_hvsi_get_chars,
.put_chars = hvc_opal_hvsi_put_chars,
+ .flush = opal_flush_chars,
.notifier_add = hvc_opal_hvsi_open,
.notifier_del = hvc_opal_hvsi_close,
.notifier_hangup = hvc_opal_hvsi_hangup,
@@ -179,8 +168,8 @@ static int hvc_opal_probe(struct platform_device *dev)
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);
+ pr_err("hvc_opal: Unknown protocol for %pOF\n",
+ dev->dev.of_node);
return -ENXIO;
}
@@ -197,21 +186,27 @@ static int hvc_opal_probe(struct platform_device *dev)
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,
+ if (proto == HV_PROTOCOL_HVSI) {
+ /*
+ * We want put_chars to be atomic to avoid mangling of
+ * hvsi packets.
+ */
+ hvsilib_init(&pv->hvsi,
+ opal_get_chars, opal_put_chars_atomic,
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);
+ pr_err("hvc_opal: Device %pOF has duplicate terminal number #%d\n",
+ dev->dev.of_node, termno);
return -ENXIO;
}
- pr_info("hvc%d: %s protocol on %s%s\n", termno,
+ pr_info("hvc%d: %s protocol on %pOF%s\n", termno,
proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
- dev->dev.of_node->full_name,
+ dev->dev.of_node,
boot ? " (boot console)" : "");
irq = irq_of_parse_and_map(dev->dev.of_node, 0);
@@ -222,8 +217,8 @@ static int hvc_opal_probe(struct platform_device *dev)
}
if (!irq) {
- pr_err("hvc_opal: Unable to map interrupt for device %s\n",
- dev->dev.of_node->full_name);
+ pr_err("hvc_opal: Unable to map interrupt for device %pOF\n",
+ dev->dev.of_node);
return irq;
}
@@ -238,19 +233,16 @@ static int hvc_opal_probe(struct platform_device *dev)
return 0;
}
-static int hvc_opal_remove(struct platform_device *dev)
+static void hvc_opal_remove(struct platform_device *dev)
{
struct hvc_struct *hp = dev_get_drvdata(&dev->dev);
- int rc, termno;
+ int 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;
+ hvc_remove(hp);
+ if (hvc_opal_privs[termno] != &hvc_opal_boot_priv)
+ kfree(hvc_opal_privs[termno]);
+ hvc_opal_privs[termno] = NULL;
}
static struct platform_driver hvc_opal_driver = {
@@ -289,6 +281,11 @@ static void udbg_opal_putc(char c)
count = hvc_opal_hvsi_put_chars(termno, &c, 1);
break;
}
+
+ /* This is needed for the cosole to flush
+ * when there aren't any interrupts.
+ */
+ opal_flush_console(termno);
} while(count == 0 || count == -EAGAIN);
}
@@ -316,14 +313,8 @@ 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 {
+ if (ch != -1)
return ch;
- }
}
}
@@ -332,7 +323,6 @@ 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)
@@ -350,9 +340,9 @@ void __init hvc_opal_init_early(void)
* path, so we hard wire it
*/
opal = of_find_node_by_path("/ibm,opal/consoles");
- if (opal)
+ if (opal) {
pr_devel("hvc_opal: Found consoles in new location\n");
- if (!opal) {
+ } else {
opal = of_find_node_by_path("/ibm,opal");
if (opal)
pr_devel("hvc_opal: "
@@ -361,7 +351,7 @@ void __init hvc_opal_init_early(void)
if (!opal)
return;
for_each_child_of_node(opal, np) {
- if (!strcmp(np->name, "serial")) {
+ if (of_node_name_eq(np, "serial")) {
stdout_node = np;
break;
}
@@ -385,8 +375,9 @@ void __init hvc_opal_init_early(void)
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);
+ hvsilib_init(&hvc_opal_boot_priv.hvsi,
+ opal_get_chars, opal_put_chars_atomic,
+ index, 1);
/* HVSI, perform the handshake now */
hvsilib_establish(&hvc_opal_boot_priv.hvsi);
pr_devel("hvc_opal: Found HVSI console\n");
@@ -418,7 +409,8 @@ void __init udbg_init_debug_opal_hvsi(void)
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,
+ hvsilib_init(&hvc_opal_boot_priv.hvsi,
+ opal_get_chars, opal_put_chars_atomic,
index, 1);
hvsilib_establish(&hvc_opal_boot_priv.hvsi);
}
generated by cgit (git 2.34.1) at 2025-12-25 12:09:52 +0000