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authorLinus Torvalds <torvalds@linux-foundation.org>2019-12-03 14:09:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-12-03 14:09:14 -0800
commit537bd0a159a041fad72d257d755205cef77582e1 (patch)
treef7e226de10589b8dfd162b80d4859dd5c00ac62e /drivers/tty/hvc
parentc3bed3b20e40ab44b98ac5f0471a5bd92a802f5a (diff)
parent27ed14d0ecb38516b6f3c6fdcd62c25c9454f979 (diff)
downloadlinux-537bd0a159a041fad72d257d755205cef77582e1.tar.bz2
Merge tag 'tty-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial updates from Greg KH: "Here is the "big" tty and serial driver patches for 5.5-rc1. It's a bit later in the merge window than normal as I wanted to make sure some last-minute patches applied to it were all sane. They seem to be :) There's a lot of little stuff in here, for the tty core, and for lots of serial drivers: - reverts of uartlite serial driver patches that were wrong - msm-serial driver fixes - serial core updates and fixes - tty core fixes - serial driver dma mapping api changes - lots of other tiny fixes and updates for serial drivers All of these have been in linux-next for a while with no reported issues" * tag 'tty-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (58 commits) Revert "serial/8250: Add support for NI-Serial PXI/PXIe+485 devices" vcs: prevent write access to vcsu devices tty: vt: keyboard: reject invalid keycodes tty: don't crash in tty_init_dev when missing tty_port serial: stm32: fix clearing interrupt error flags tty: Fix Kconfig indentation, continued serial: serial_core: Perform NULL checks for break_ctl ops tty: remove unused argument from tty_open_by_driver() tty: Fix Kconfig indentation {tty: serial, nand: onenand}: samsung: rename to fix build warning serial: ifx6x60: add missed pm_runtime_disable serial: pl011: Fix DMA ->flush_buffer() Revert "serial-uartlite: Move the uart register" Revert "serial-uartlite: Add get serial id if not provided" Revert "serial-uartlite: Do not use static struct uart_driver out of probe()" Revert "serial-uartlite: Add runtime support" Revert "serial-uartlite: Change logic how console_port is setup" Revert "serial-uartlite: Use allocated structure instead of static ones" tty: serial: msm_serial: Use dma_request_chan() directly for channel request tty: serial: tegra: Use dma_request_chan() directly for channel request ...
Diffstat (limited to 'drivers/tty/hvc')
-rw-r--r--drivers/tty/hvc/Kconfig28
-rw-r--r--drivers/tty/hvc/hvc_dcc.c28
2 files changed, 42 insertions, 14 deletions
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
index 4487a6b9acc8..6a3c97d345a0 100644
--- a/drivers/tty/hvc/Kconfig
+++ b/drivers/tty/hvc/Kconfig
@@ -70,22 +70,22 @@ config HVC_XEN_FRONTEND
Xen driver for secondary virtual consoles
config HVC_UDBG
- bool "udbg based fake hypervisor console"
- depends on PPC
- select HVC_DRIVER
- help
- This is meant to be used during HW bring up or debugging when
- no other console mechanism exist but udbg, to get you a quick
- console for userspace. Do NOT enable in production kernels.
+ bool "udbg based fake hypervisor console"
+ depends on PPC
+ select HVC_DRIVER
+ help
+ This is meant to be used during HW bring up or debugging when
+ no other console mechanism exist but udbg, to get you a quick
+ console for userspace. Do NOT enable in production kernels.
config HVC_DCC
- bool "ARM JTAG DCC console"
- depends on ARM || ARM64
- select HVC_DRIVER
- help
- This console uses the JTAG DCC on ARM to create a console under the HVC
- driver. This console is used through a JTAG only on ARM. If you don't have
- a JTAG then you probably don't want this option.
+ bool "ARM JTAG DCC console"
+ depends on ARM || ARM64
+ select HVC_DRIVER
+ help
+ This console uses the JTAG DCC on ARM to create a console under the HVC
+ driver. This console is used through a JTAG only on ARM. If you don't have
+ a JTAG then you probably don't want this option.
config HVC_RISCV_SBI
bool "RISC-V SBI console support"
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
index 02629a1f193d..8e0edb7d93fd 100644
--- a/drivers/tty/hvc/hvc_dcc.c
+++ b/drivers/tty/hvc/hvc_dcc.c
@@ -1,7 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved. */
+#include <linux/console.h>
#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
#include <asm/dcc.h>
#include <asm/processor.h>
@@ -12,6 +15,31 @@
#define DCC_STATUS_RX (1 << 30)
#define DCC_STATUS_TX (1 << 29)
+static void dcc_uart_console_putchar(struct uart_port *port, int ch)
+{
+ while (__dcc_getstatus() & DCC_STATUS_TX)
+ cpu_relax();
+
+ __dcc_putchar(ch);
+}
+
+static void dcc_early_write(struct console *con, const char *s, unsigned n)
+{
+ struct earlycon_device *dev = con->data;
+
+ uart_console_write(&dev->port, s, n, dcc_uart_console_putchar);
+}
+
+static int __init dcc_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ device->con->write = dcc_early_write;
+
+ return 0;
+}
+
+EARLYCON_DECLARE(dcc, dcc_early_console_setup);
+
static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
{
int i;