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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 18:50:03 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 18:50:03 +0000
commit01a69402cf9d38ff180345d55c2ee51c7e89fbc7 (patch)
treeb406c5242a088c4f59c6e4b719b783f43aca6ae9 /drivers/tty/hvc/hvc_dcc.c
parentAdding upstream version 6.7.12. (diff)
downloadlinux-01a69402cf9d38ff180345d55c2ee51c7e89fbc7.tar.xz
linux-01a69402cf9d38ff180345d55c2ee51c7e89fbc7.zip
Adding upstream version 6.8.9.upstream/6.8.9
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/tty/hvc/hvc_dcc.c')
-rw-r--r--drivers/tty/hvc/hvc_dcc.c32
1 files changed, 20 insertions, 12 deletions
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
index 1751108cf7..dfc5c9c38f 100644
--- a/drivers/tty/hvc/hvc_dcc.c
+++ b/drivers/tty/hvc/hvc_dcc.c
@@ -26,10 +26,10 @@
/* Lock to serialize access to DCC fifo */
static DEFINE_SPINLOCK(dcc_lock);
-static DEFINE_KFIFO(inbuf, unsigned char, DCC_INBUF_SIZE);
-static DEFINE_KFIFO(outbuf, unsigned char, DCC_OUTBUF_SIZE);
+static DEFINE_KFIFO(inbuf, u8, DCC_INBUF_SIZE);
+static DEFINE_KFIFO(outbuf, u8, DCC_OUTBUF_SIZE);
-static void dcc_uart_console_putchar(struct uart_port *port, unsigned char ch)
+static void dcc_uart_console_putchar(struct uart_port *port, u8 ch)
{
while (__dcc_getstatus() & DCC_STATUS_TX)
cpu_relax();
@@ -47,6 +47,14 @@ static void dcc_early_write(struct console *con, const char *s, unsigned n)
static int __init dcc_early_console_setup(struct earlycon_device *device,
const char *opt)
{
+ unsigned int count = 0x4000000;
+
+ while (--count && (__dcc_getstatus() & DCC_STATUS_TX))
+ cpu_relax();
+
+ if (__dcc_getstatus() & DCC_STATUS_TX)
+ return -ENODEV;
+
device->con->write = dcc_early_write;
return 0;
@@ -54,9 +62,9 @@ static int __init dcc_early_console_setup(struct earlycon_device *device,
EARLYCON_DECLARE(dcc, dcc_early_console_setup);
-static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
+static ssize_t hvc_dcc_put_chars(uint32_t vt, const u8 *buf, size_t count)
{
- int i;
+ size_t i;
for (i = 0; i < count; i++) {
while (__dcc_getstatus() & DCC_STATUS_TX)
@@ -68,9 +76,9 @@ static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
return count;
}
-static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count)
+static ssize_t hvc_dcc_get_chars(uint32_t vt, u8 *buf, size_t count)
{
- int i;
+ size_t i;
for (i = 0; i < count; ++i)
if (__dcc_getstatus() & DCC_STATUS_RX)
@@ -149,8 +157,8 @@ static DECLARE_WORK(dcc_pwork, dcc_put_work);
*/
static void dcc_get_work(struct work_struct *work)
{
- unsigned char ch;
unsigned long irqflags;
+ u8 ch;
/*
* Read characters from DCC and put them into the input FIFO, as
@@ -172,10 +180,10 @@ static DECLARE_WORK(dcc_gwork, dcc_get_work);
* Write characters directly to the DCC if we're on core 0 and the FIFO
* is empty, or write them to the FIFO if we're not.
*/
-static int hvc_dcc0_put_chars(u32 vt, const char *buf, int count)
+static ssize_t hvc_dcc0_put_chars(u32 vt, const u8 *buf, size_t count)
{
- int len;
unsigned long irqflags;
+ ssize_t len;
if (!IS_ENABLED(CONFIG_HVC_DCC_SERIALIZE_SMP))
return hvc_dcc_put_chars(vt, buf, count);
@@ -211,10 +219,10 @@ static int hvc_dcc0_put_chars(u32 vt, const char *buf, int count)
* Read characters directly from the DCC if we're on core 0 and the FIFO
* is empty, or read them from the FIFO if we're not.
*/
-static int hvc_dcc0_get_chars(u32 vt, char *buf, int count)
+static ssize_t hvc_dcc0_get_chars(u32 vt, u8 *buf, size_t count)
{
- int len;
unsigned long irqflags;
+ ssize_t len;
if (!IS_ENABLED(CONFIG_HVC_DCC_SERIALIZE_SMP))
return hvc_dcc_get_chars(vt, buf, count);