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linux/arch/arm/include/debug/clps711x.S

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 Based on 1 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 as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 14:55:01 +08:00
/* SPDX-License-Identifier: GPL-2.0-or-later */
ARM: clps711x: Move debug include into arch/arm/include/debug/ One more step to allowing CLPS711X to participate in the multi-platform defconfig. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Olof Johansson <olof@lixom.net>
2014-06-19 23:26:34 +08:00
/*
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
*/
#ifndef CONFIG_DEBUG_CLPS711X_UART2
#define CLPS711X_UART_PADDR (0x80000000 + 0x0000)
ARM: clps711x: Reduce static map size Last CLPS711X CPU register is PLLR has 0xa5a8 address, so we can reduce the map to 48k and align the end of the static at VMALLOC_START. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2016-06-04 15:09:53 +08:00
#define CLPS711X_UART_VADDR (0xfeff4000 + 0x0000)
ARM: clps711x: Move debug include into arch/arm/include/debug/ One more step to allowing CLPS711X to participate in the multi-platform defconfig. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Olof Johansson <olof@lixom.net>
2014-06-19 23:26:34 +08:00
#else
#define CLPS711X_UART_PADDR (0x80000000 + 0x1000)
ARM: clps711x: Reduce static map size Last CLPS711X CPU register is PLLR has 0xa5a8 address, so we can reduce the map to 48k and align the end of the static at VMALLOC_START. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2016-06-04 15:09:53 +08:00
#define CLPS711X_UART_VADDR (0xfeff4000 + 0x1000)
ARM: clps711x: Move debug include into arch/arm/include/debug/ One more step to allowing CLPS711X to participate in the multi-platform defconfig. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Olof Johansson <olof@lixom.net>
2014-06-19 23:26:34 +08:00
#endif
#define SYSFLG (0x0140)
#define SYSFLG_UBUSY (1 << 11)
#define UARTDR (0x0480)
.macro addruart, rp, rv, tmp
ldr \rv, =CLPS711X_UART_VADDR
ldr \rp, =CLPS711X_UART_PADDR
.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>
2020-08-28 06:25:37 +08:00
.macro waituartcts,rd,rx
.endm
.macro waituarttxrdy,rd,rx
ARM: clps711x: Move debug include into arch/arm/include/debug/ One more step to allowing CLPS711X to participate in the multi-platform defconfig. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Olof Johansson <olof@lixom.net>
2014-06-19 23:26:34 +08:00
.endm
.macro senduart,rd,rx
str \rd, [\rx, #UARTDR]
.endm
.macro busyuart,rd,rx
1001: ldr \rd, [\rx, #SYSFLG]
tst \rd, #SYSFLG_UBUSY
bne 1001b
.endm
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