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linux-stable/arch/arm/include/debug/8250.S

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-04 08:11:33 +00:00
/* SPDX-License-Identifier: GPL-2.0-only */
[ARM] Collect 8250-based debug implementations together Several ARM machine implementations used an 8250 compatible port for debugging purposes, and indepdently implemented the low level debug macros every time. Provide a common implementation and convert these implementations to use this version. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-16 20:40:25 +00:00
/*
ARM: debug: move 8250 debug include into arch/arm/include/debug/ Now that the 8250 debug include can stand alone without requiring platforms to provide any macros, move it into the debug directory so it can be directly included. This allows us to get rid of a lot of debug-macros include files. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-06 23:11:35 +00:00
* arch/arm/include/debug/8250.S
[ARM] Collect 8250-based debug implementations together Several ARM machine implementations used an 8250 compatible port for debugging purposes, and indepdently implemented the low level debug macros every time. Provide a common implementation and convert these implementations to use this version. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-16 20:40:25 +00:00
*
ARM: debug: provide 8250 debug uart phys/virt address configuration options Move the definition of the UART register addresses out of the platform specific header file into the Kconfig files. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-06 23:01:39 +00:00
* Copyright (C) 1994-2013 Russell King
[ARM] Collect 8250-based debug implementations together Several ARM machine implementations used an 8250 compatible port for debugging purposes, and indepdently implemented the low level debug macros every time. Provide a common implementation and convert these implementations to use this version. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-16 20:40:25 +00:00
*/
#include <linux/serial_reg.h>
ARM: debug: provide 8250 debug uart phys/virt address configuration options Move the definition of the UART register addresses out of the platform specific header file into the Kconfig files. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-06 23:01:39 +00:00
.macro addruart, rp, rv, tmp
ldr \rp, =CONFIG_DEBUG_UART_PHYS
ldr \rv, =CONFIG_DEBUG_UART_VIRT
.endm
ARM: debug: add support for word accesses to debug/8250.S Add 32-bit word access support to debug/8250.S and convert Picoxcell and SoCFPGA to this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-07 10:42:46 +00:00
#ifdef CONFIG_DEBUG_UART_8250_WORD
.macro store, rd, rx:vararg
ARM: debug: fix big endian operation for 8250 word mode If the 8250 debug code is used in word mode on an big endian host then the writes need to be change into little endian for the bus. Note, we have to re-convert the value back as the debug code will inspect the value after writing it to see if a newline has been written. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
2015-03-25 11:27:46 +00:00
ARM_BE8(rev \rd, \rd)
ARM: debug: add support for word accesses to debug/8250.S Add 32-bit word access support to debug/8250.S and convert Picoxcell and SoCFPGA to this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-07 10:42:46 +00:00
str \rd, \rx
ARM: debug: fix big endian operation for 8250 word mode If the 8250 debug code is used in word mode on an big endian host then the writes need to be change into little endian for the bus. Note, we have to re-convert the value back as the debug code will inspect the value after writing it to see if a newline has been written. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
2015-03-25 11:27:46 +00:00
ARM_BE8(rev \rd, \rd)
ARM: debug: add support for word accesses to debug/8250.S Add 32-bit word access support to debug/8250.S and convert Picoxcell and SoCFPGA to this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-07 10:42:46 +00:00
.endm
.macro load, rd, rx:vararg
ldr \rd, \rx
ARM: debug: fix big endian operation for 8250 word mode If the 8250 debug code is used in word mode on an big endian host then the writes need to be change into little endian for the bus. Note, we have to re-convert the value back as the debug code will inspect the value after writing it to see if a newline has been written. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
2015-03-25 11:27:46 +00:00
ARM_BE8(rev \rd, \rd)
ARM: debug: add support for word accesses to debug/8250.S Add 32-bit word access support to debug/8250.S and convert Picoxcell and SoCFPGA to this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-07 10:42:46 +00:00
.endm
#else
.macro store, rd, rx:vararg
strb \rd, \rx
.endm
.macro load, rd, rx:vararg
ldrb \rd, \rx
.endm
#endif
ARM: debug: provide 8250 debug uart register shift configuration option Move the definition of the UART register shift out of the platform specific header file into the Kconfig files. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-06 22:13:15 +00:00
#define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT
[ARM] Collect 8250-based debug implementations together Several ARM machine implementations used an 8250 compatible port for debugging purposes, and indepdently implemented the low level debug macros every time. Provide a common implementation and convert these implementations to use this version. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-16 20:40:25 +00:00
.macro senduart,rd,rx
ARM: debug: add support for word accesses to debug/8250.S Add 32-bit word access support to debug/8250.S and convert Picoxcell and SoCFPGA to this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-07 10:42:46 +00:00
store \rd, [\rx, #UART_TX << UART_SHIFT]
[ARM] Collect 8250-based debug implementations together Several ARM machine implementations used an 8250 compatible port for debugging purposes, and indepdently implemented the low level debug macros every time. Provide a common implementation and convert these implementations to use this version. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-16 20:40:25 +00:00
.endm
.macro busyuart,rd,rx
ARM: debug: add support for word accesses to debug/8250.S Add 32-bit word access support to debug/8250.S and convert Picoxcell and SoCFPGA to this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-07 10:42:46 +00:00
1002: load \rd, [\rx, #UART_LSR << UART_SHIFT]
[ARM] Collect 8250-based debug implementations together Several ARM machine implementations used an 8250 compatible port for debugging purposes, and indepdently implemented the low level debug macros every time. Provide a common implementation and convert these implementations to use this version. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-16 20:40:25 +00:00
and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
bne 1002b
.endm
ARM: 9004/1: debug: Split waituart to CTS and TXRDY This patch was triggered by a remark from Russell that introducing a call to the waituart (needed to fix debug prints on the Qualcomm platforms) was dangerous because in some cases this will involve waiting for a modem CTS (clear to send) signal, and debug messages would maybe not work on platforms with no modem connected to the UART port: they will just hang waiting for the modem to assert CTS and this might never happen. Looking through all UART debug drivers implementing the waituart macro I discovered that all users except two actually use this macro to check if the UART is ready for TX, let's call this TXRDY. Only two debug UART drivers actually check for CTS: - arch/arm/include/debug/8250.S - arch/arm/include/debug/tegra.S The former is very significant since the 8250 is possibly the most common UART on the planet. We have the following problem: the semantics of waituart are ambiguous making it dangerous to introduce the macro to debug code fixing debug prints for Qualcomm. To start to pry this problem apart, this patch does the following: - Convert all debug UART drivers to define two macros: - waituartcts with the clear semantic to wait for CTS to be asserted - waituarttxrdy with the clear semantic to wait for the TX capability of the UART to be ready - When doing this take care to assign the right function to each drivers macro, so they now do exactly the above. - Update the three sites in the kernel invoking the waituart macro to call waituartcts/waituarttxrdy in sequence, so that the functional impact on the kernel should be zero. After this we can start to change the code sites using this code to do the right thing. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
2020-08-27 22:25:37 +00:00
.macro waituarttxrdy,rd,rx
.endm
.macro waituartcts,rd,rx
ARM: debug: add support for word accesses to debug/8250.S Add 32-bit word access support to debug/8250.S and convert Picoxcell and SoCFPGA to this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-07-07 10:42:46 +00:00
1001: load \rd, [\rx, #UART_MSR << UART_SHIFT]
[ARM] Collect 8250-based debug implementations together Several ARM machine implementations used an 8250 compatible port for debugging purposes, and indepdently implemented the low level debug macros every time. Provide a common implementation and convert these implementations to use this version. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-16 20:40:25 +00:00
tst \rd, #UART_MSR_CTS
beq 1001b
.endm
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