[PATCH V2 3/3] ARM: tegra: move debug-macro.S to include/debug
Stephen Warren
swarren at wwwdotorg.org
Mon Oct 15 15:07:04 EDT 2012
From: Stephen Warren <swarren at nvidia.com>
Move Tegra's debug-macro.S over to the common debug macro directory.
Move Tegra's debug UART selection menu into ARM's Kconfig.debug, so that
all related options are selected in the same place.
Tegra's uncompress.h is left in mach-tegra/include/mach; it will be
removed whenever Tegra is converted to multi-platform.
Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
Rob, Arnd, Olof, I'd particularly like feedback on whether the following:
#include "../../mach-tegra/iomap.h"
in arch/arm/include/debug/tegra.S is acceptable. I'd really like to
continue to #include a header to share the defines to Tegra physical
memory layout and virtual based addresses with Tegra's io.c's struct
map_desc entries, so they can't get out of sync. So, the include can
either use the relative path as quoted above (which I don't think will
cause any significant maintenance issue), or Tegra's iomap.h would have
to be moved somewhere public so e.g. <tegra-iomap.h> could be included.
Second, is the Kconfig.debug change reasonable? I guess I could remove
the second choice menu I added, and just put all the options in the main
"Kernel low-level debugging port" choice. However, that would make the
"if" statements in "config DEBUG_LL_INCLUDE" rather more unwieldy.
v2:
* Remove redundant default selection in Kconfig.debug, fix indentation
there.
* Rebase on iomap.h/irammap.h moves
arch/arm/Kconfig.debug | 38 +++++
arch/arm/include/debug/tegra.S | 209 +++++++++++++++++++++++
arch/arm/mach-tegra/Kconfig | 29 ----
arch/arm/mach-tegra/include/mach/debug-macro.S | 211 ------------------------
4 files changed, 247 insertions(+), 240 deletions(-)
create mode 100644 arch/arm/include/debug/tegra.S
delete mode 100644 arch/arm/mach-tegra/include/mach/debug-macro.S
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index b0f3857..96b9425 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -345,6 +345,13 @@ choice
Say Y here if you want kernel low-level debugging support
on SOCFPGA based platforms.
+ config DEBUG_TEGRA_UART
+ depends on ARCH_TEGRA
+ bool "Use Tegra UART for low-level debug"
+ help
+ Say Y here if you want kernel low-level debugging support
+ on Tegra based platforms.
+
config DEBUG_VEXPRESS_UART0_DETECT
bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
depends on ARCH_VEXPRESS && CPU_CP15_MMU
@@ -409,6 +416,36 @@ choice
endchoice
+choice
+ prompt "Low-level debug console UART"
+ depends on DEBUG_LL && DEBUG_TEGRA_UART
+
+ config TEGRA_DEBUG_UART_AUTO_ODMDATA
+ bool "Via ODMDATA"
+ help
+ Automatically determines which UART to use for low-level debug based
+ on the ODMDATA value. This value is part of the BCT, and is written
+ to the boot memory device using nvflash, or other flashing tool.
+ When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
+ 0/1/2/3/4 are UART A/B/C/D/E.
+
+ config TEGRA_DEBUG_UARTA
+ bool "UART A"
+
+ config TEGRA_DEBUG_UARTB
+ bool "UART B"
+
+ config TEGRA_DEBUG_UARTC
+ bool "UART C"
+
+ config TEGRA_DEBUG_UARTD
+ bool "UART D"
+
+ config TEGRA_DEBUG_UARTE
+ bool "UART E"
+
+endchoice
+
config DEBUG_LL_INCLUDE
string
default "debug/icedcc.S" if DEBUG_ICEDCC
@@ -418,6 +455,7 @@ config DEBUG_LL_INCLUDE
default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
+ default "debug/tegra.S" if DEBUG_TEGRA_UART
default "mach/debug-macro.S"
config EARLY_PRINTK
diff --git a/arch/arm/include/debug/tegra.S b/arch/arm/include/debug/tegra.S
new file mode 100644
index 0000000..b957abb
--- /dev/null
+++ b/arch/arm/include/debug/tegra.S
@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2010,2011 Google, Inc.
+ * Copyright (C) 2011-2012 NVIDIA CORPORATION. All Rights Reserved.
+ *
+ * Author:
+ * Colin Cross <ccross at google.com>
+ * Erik Gilling <konkers at google.com>
+ * Doug Anderson <dianders at chromium.org>
+ * Stephen Warren <swarren at nvidia.com>
+ *
+ * Portions based on mach-omap2's debug-macro.S
+ * Copyright (C) 1994-1999 Russell King
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/serial_reg.h>
+
+#include "../../mach-tegra/iomap.h"
+
+#define UART_SHIFT 2
+
+#define TEGRA_CLK_RST_DEVICES_L (TEGRA_CLK_RESET_BASE + 0x04)
+#define TEGRA_CLK_RST_DEVICES_H (TEGRA_CLK_RESET_BASE + 0x08)
+#define TEGRA_CLK_RST_DEVICES_U (TEGRA_CLK_RESET_BASE + 0x0c)
+#define TEGRA_CLK_OUT_ENB_L (TEGRA_CLK_RESET_BASE + 0x10)
+#define TEGRA_CLK_OUT_ENB_H (TEGRA_CLK_RESET_BASE + 0x14)
+#define TEGRA_CLK_OUT_ENB_U (TEGRA_CLK_RESET_BASE + 0x18)
+#define TEGRA_PMC_SCRATCH20 (TEGRA_PMC_BASE + 0xa0)
+#define TEGRA_APB_MISC_GP_HIDREV (TEGRA_APB_MISC_BASE + 0x804)
+
+#define checkuart(rp, rv, lhu, bit, uart) \
+ /* Load address of CLK_RST register */ \
+ movw rp, #TEGRA_CLK_RST_DEVICES_##lhu & 0xffff ; \
+ movt rp, #TEGRA_CLK_RST_DEVICES_##lhu >> 16 ; \
+ /* Load value from CLK_RST register */ \
+ ldr rp, [rp, #0] ; \
+ /* Test UART's reset bit */ \
+ tst rp, #(1 << bit) ; \
+ /* If set, can't use UART; jump to save no UART */ \
+ bne 90f ; \
+ /* Load address of CLK_OUT_ENB register */ \
+ movw rp, #TEGRA_CLK_OUT_ENB_##lhu & 0xffff ; \
+ movt rp, #TEGRA_CLK_OUT_ENB_##lhu >> 16 ; \
+ /* Load value from CLK_OUT_ENB register */ \
+ ldr rp, [rp, #0] ; \
+ /* Test UART's clock enable bit */ \
+ tst rp, #(1 << bit) ; \
+ /* If clear, can't use UART; jump to save no UART */ \
+ beq 90f ; \
+ /* Passed all tests, load address of UART registers */ \
+ movw rp, #TEGRA_UART##uart##_BASE & 0xffff ; \
+ movt rp, #TEGRA_UART##uart##_BASE >> 16 ; \
+ /* Jump to save UART address */ \
+ b 91f
+
+ .macro addruart, rp, rv, tmp
+ adr \rp, 99f @ actual addr of 99f
+ ldr \rv, [\rp] @ linked addr is stored there
+ sub \rv, \rv, \rp @ offset between the two
+ ldr \rp, [\rp, #4] @ linked tegra_uart_config
+ sub \tmp, \rp, \rv @ actual tegra_uart_config
+ ldr \rp, [\tmp] @ Load tegra_uart_config
+ cmp \rp, #1 @ needs initialization?
+ bne 100f @ no; go load the addresses
+ mov \rv, #0 @ yes; record init is done
+ str \rv, [\tmp]
+
+#ifdef CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA
+ /* Check ODMDATA */
+10: movw \rp, #TEGRA_PMC_SCRATCH20 & 0xffff
+ movt \rp, #TEGRA_PMC_SCRATCH20 >> 16
+ ldr \rp, [\rp, #0] @ Load PMC_SCRATCH20
+ ubfx \rv, \rp, #18, #2 @ 19:18 are console type
+ cmp \rv, #2 @ 2 and 3 mean DCC, UART
+ beq 11f @ some boards swap the meaning
+ cmp \rv, #3 @ so accept either
+ bne 90f
+11: ubfx \rv, \rp, #15, #3 @ 17:15 are UART ID
+ cmp \rv, #0 @ UART 0?
+ beq 20f
+ cmp \rv, #1 @ UART 1?
+ beq 21f
+ cmp \rv, #2 @ UART 2?
+ beq 22f
+ cmp \rv, #3 @ UART 3?
+ beq 23f
+ cmp \rv, #4 @ UART 4?
+ beq 24f
+ b 90f @ invalid
+#endif
+
+#if defined(CONFIG_TEGRA_DEBUG_UARTA) || \
+ defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
+ /* Check UART A validity */
+20: checkuart(\rp, \rv, L, 6, A)
+#endif
+
+#if defined(CONFIG_TEGRA_DEBUG_UARTB) || \
+ defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
+ /* Check UART B validity */
+21: checkuart(\rp, \rv, L, 7, B)
+#endif
+
+#if defined(CONFIG_TEGRA_DEBUG_UARTC) || \
+ defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
+ /* Check UART C validity */
+22: checkuart(\rp, \rv, H, 23, C)
+#endif
+
+#if defined(CONFIG_TEGRA_DEBUG_UARTD) || \
+ defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
+ /* Check UART D validity */
+23: checkuart(\rp, \rv, U, 1, D)
+#endif
+
+#if defined(CONFIG_TEGRA_DEBUG_UARTE) || \
+ defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
+ /* Check UART E validity */
+24:
+ checkuart(\rp, \rv, U, 2, E)
+#endif
+
+ /* No valid UART found */
+90: mov \rp, #0
+ /* fall through */
+
+ /* Record whichever UART we chose */
+91: str \rp, [\tmp, #4] @ Store in tegra_uart_phys
+ cmp \rp, #0 @ Valid UART address?
+ bne 92f @ Yes, go process it
+ str \rp, [\tmp, #8] @ Store 0 in tegra_uart_phys
+ b 100f @ Done
+92: sub \rv, \rp, #IO_APB_PHYS @ Calculate virt address
+ add \rv, \rv, #IO_APB_VIRT
+ str \rv, [\tmp, #8] @ Store in tegra_uart_virt
+ movw \rv, #TEGRA_APB_MISC_GP_HIDREV & 0xffff
+ movt \rv, #TEGRA_APB_MISC_GP_HIDREV >> 16
+ ldr \rv, [\rv, #0] @ Load HIDREV
+ ubfx \rv, \rv, #8, #8 @ 15:8 are SoC version
+ cmp \rv, #0x20 @ Tegra20?
+ moveq \rv, #0x75 @ Tegra20 divisor
+ movne \rv, #0xdd @ Tegra30 divisor
+ str \rv, [\tmp, #12] @ Save divisor to scratch
+ /* uart[UART_LCR] = UART_LCR_WLEN8 | UART_LCR_DLAB; */
+ mov \rv, #UART_LCR_WLEN8 | UART_LCR_DLAB
+ str \rv, [\rp, #UART_LCR << UART_SHIFT]
+ /* uart[UART_DLL] = div & 0xff; */
+ ldr \rv, [\tmp, #12]
+ and \rv, \rv, #0xff
+ str \rv, [\rp, #UART_DLL << UART_SHIFT]
+ /* uart[UART_DLM] = div >> 8; */
+ ldr \rv, [\tmp, #12]
+ lsr \rv, \rv, #8
+ str \rv, [\rp, #UART_DLM << UART_SHIFT]
+ /* uart[UART_LCR] = UART_LCR_WLEN8; */
+ mov \rv, #UART_LCR_WLEN8
+ str \rv, [\rp, #UART_LCR << UART_SHIFT]
+ b 100f
+
+ .align
+99: .word .
+ .word tegra_uart_config
+ .ltorg
+
+ /* Load previously selected UART address */
+100: ldr \rp, [\tmp, #4] @ Load tegra_uart_phys
+ ldr \rv, [\tmp, #8] @ Load tegra_uart_virt
+ .endm
+
+/*
+ * Code below is swiped from <asm/hardware/debug-8250.S>, but add an extra
+ * check to make sure that the UART address is actually valid.
+ */
+
+ .macro senduart, rd, rx
+ cmp \rx, #0
+ strneb \rd, [\rx, #UART_TX << UART_SHIFT]
+1001:
+ .endm
+
+ .macro busyuart, rd, rx
+ cmp \rx, #0
+ beq 1002f
+1001: ldrb \rd, [\rx, #UART_LSR << UART_SHIFT]
+ and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
+ teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
+ bne 1001b
+1002:
+ .endm
+
+ .macro waituart, rd, rx
+#ifdef FLOW_CONTROL
+ cmp \rx, #0
+ beq 1002f
+1001: ldrb \rd, [\rx, #UART_MSR << UART_SHIFT]
+ tst \rd, #UART_MSR_CTS
+ beq 1001b
+1002:
+#endif
+ .endm
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index 97fcd16..e426d1b 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -57,35 +57,6 @@ config TEGRA_AHB
which controls AHB bus master arbitration and some
perfomance parameters(priority, prefech size).
-choice
- prompt "Low-level debug console UART"
-
-config TEGRA_DEBUG_UART_AUTO_ODMDATA
- bool "Via ODMDATA"
- help
- Automatically determines which UART to use for low-level debug based
- on the ODMDATA value. This value is part of the BCT, and is written
- to the boot memory device using nvflash, or other flashing tool.
- When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
- 0/1/2/3/4 are UART A/B/C/D/E.
-
-config TEGRA_DEBUG_UARTA
- bool "UART-A"
-
-config TEGRA_DEBUG_UARTB
- bool "UART-B"
-
-config TEGRA_DEBUG_UARTC
- bool "UART-C"
-
-config TEGRA_DEBUG_UARTD
- bool "UART-D"
-
-config TEGRA_DEBUG_UARTE
- bool "UART-E"
-
-endchoice
-
config TEGRA_EMC_SCALING_ENABLE
bool "Enable scaling the memory frequency"
diff --git a/arch/arm/mach-tegra/include/mach/debug-macro.S b/arch/arm/mach-tegra/include/mach/debug-macro.S
deleted file mode 100644
index d4c23d6..0000000
--- a/arch/arm/mach-tegra/include/mach/debug-macro.S
+++ /dev/null
@@ -1,211 +0,0 @@
-/*
- * arch/arm/mach-tegra/include/mach/debug-macro.S
- *
- * Copyright (C) 2010,2011 Google, Inc.
- * Copyright (C) 2011-2012 NVIDIA CORPORATION. All Rights Reserved.
- *
- * Author:
- * Colin Cross <ccross at google.com>
- * Erik Gilling <konkers at google.com>
- * Doug Anderson <dianders at chromium.org>
- * Stephen Warren <swarren at nvidia.com>
- *
- * Portions based on mach-omap2's debug-macro.S
- * Copyright (C) 1994-1999 Russell King
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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.
- *
- */
-
-#include <linux/serial_reg.h>
-
-#include "../../iomap.h"
-
-#define UART_SHIFT 2
-
-#define TEGRA_CLK_RST_DEVICES_L (TEGRA_CLK_RESET_BASE + 0x04)
-#define TEGRA_CLK_RST_DEVICES_H (TEGRA_CLK_RESET_BASE + 0x08)
-#define TEGRA_CLK_RST_DEVICES_U (TEGRA_CLK_RESET_BASE + 0x0c)
-#define TEGRA_CLK_OUT_ENB_L (TEGRA_CLK_RESET_BASE + 0x10)
-#define TEGRA_CLK_OUT_ENB_H (TEGRA_CLK_RESET_BASE + 0x14)
-#define TEGRA_CLK_OUT_ENB_U (TEGRA_CLK_RESET_BASE + 0x18)
-#define TEGRA_PMC_SCRATCH20 (TEGRA_PMC_BASE + 0xa0)
-#define TEGRA_APB_MISC_GP_HIDREV (TEGRA_APB_MISC_BASE + 0x804)
-
-#define checkuart(rp, rv, lhu, bit, uart) \
- /* Load address of CLK_RST register */ \
- movw rp, #TEGRA_CLK_RST_DEVICES_##lhu & 0xffff ; \
- movt rp, #TEGRA_CLK_RST_DEVICES_##lhu >> 16 ; \
- /* Load value from CLK_RST register */ \
- ldr rp, [rp, #0] ; \
- /* Test UART's reset bit */ \
- tst rp, #(1 << bit) ; \
- /* If set, can't use UART; jump to save no UART */ \
- bne 90f ; \
- /* Load address of CLK_OUT_ENB register */ \
- movw rp, #TEGRA_CLK_OUT_ENB_##lhu & 0xffff ; \
- movt rp, #TEGRA_CLK_OUT_ENB_##lhu >> 16 ; \
- /* Load value from CLK_OUT_ENB register */ \
- ldr rp, [rp, #0] ; \
- /* Test UART's clock enable bit */ \
- tst rp, #(1 << bit) ; \
- /* If clear, can't use UART; jump to save no UART */ \
- beq 90f ; \
- /* Passed all tests, load address of UART registers */ \
- movw rp, #TEGRA_UART##uart##_BASE & 0xffff ; \
- movt rp, #TEGRA_UART##uart##_BASE >> 16 ; \
- /* Jump to save UART address */ \
- b 91f
-
- .macro addruart, rp, rv, tmp
- adr \rp, 99f @ actual addr of 99f
- ldr \rv, [\rp] @ linked addr is stored there
- sub \rv, \rv, \rp @ offset between the two
- ldr \rp, [\rp, #4] @ linked tegra_uart_config
- sub \tmp, \rp, \rv @ actual tegra_uart_config
- ldr \rp, [\tmp] @ Load tegra_uart_config
- cmp \rp, #1 @ needs initialization?
- bne 100f @ no; go load the addresses
- mov \rv, #0 @ yes; record init is done
- str \rv, [\tmp]
-
-#ifdef CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA
- /* Check ODMDATA */
-10: movw \rp, #TEGRA_PMC_SCRATCH20 & 0xffff
- movt \rp, #TEGRA_PMC_SCRATCH20 >> 16
- ldr \rp, [\rp, #0] @ Load PMC_SCRATCH20
- ubfx \rv, \rp, #18, #2 @ 19:18 are console type
- cmp \rv, #2 @ 2 and 3 mean DCC, UART
- beq 11f @ some boards swap the meaning
- cmp \rv, #3 @ so accept either
- bne 90f
-11: ubfx \rv, \rp, #15, #3 @ 17:15 are UART ID
- cmp \rv, #0 @ UART 0?
- beq 20f
- cmp \rv, #1 @ UART 1?
- beq 21f
- cmp \rv, #2 @ UART 2?
- beq 22f
- cmp \rv, #3 @ UART 3?
- beq 23f
- cmp \rv, #4 @ UART 4?
- beq 24f
- b 90f @ invalid
-#endif
-
-#if defined(CONFIG_TEGRA_DEBUG_UARTA) || \
- defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
- /* Check UART A validity */
-20: checkuart(\rp, \rv, L, 6, A)
-#endif
-
-#if defined(CONFIG_TEGRA_DEBUG_UARTB) || \
- defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
- /* Check UART B validity */
-21: checkuart(\rp, \rv, L, 7, B)
-#endif
-
-#if defined(CONFIG_TEGRA_DEBUG_UARTC) || \
- defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
- /* Check UART C validity */
-22: checkuart(\rp, \rv, H, 23, C)
-#endif
-
-#if defined(CONFIG_TEGRA_DEBUG_UARTD) || \
- defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
- /* Check UART D validity */
-23: checkuart(\rp, \rv, U, 1, D)
-#endif
-
-#if defined(CONFIG_TEGRA_DEBUG_UARTE) || \
- defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
- /* Check UART E validity */
-24:
- checkuart(\rp, \rv, U, 2, E)
-#endif
-
- /* No valid UART found */
-90: mov \rp, #0
- /* fall through */
-
- /* Record whichever UART we chose */
-91: str \rp, [\tmp, #4] @ Store in tegra_uart_phys
- cmp \rp, #0 @ Valid UART address?
- bne 92f @ Yes, go process it
- str \rp, [\tmp, #8] @ Store 0 in tegra_uart_phys
- b 100f @ Done
-92: sub \rv, \rp, #IO_APB_PHYS @ Calculate virt address
- add \rv, \rv, #IO_APB_VIRT
- str \rv, [\tmp, #8] @ Store in tegra_uart_virt
- movw \rv, #TEGRA_APB_MISC_GP_HIDREV & 0xffff
- movt \rv, #TEGRA_APB_MISC_GP_HIDREV >> 16
- ldr \rv, [\rv, #0] @ Load HIDREV
- ubfx \rv, \rv, #8, #8 @ 15:8 are SoC version
- cmp \rv, #0x20 @ Tegra20?
- moveq \rv, #0x75 @ Tegra20 divisor
- movne \rv, #0xdd @ Tegra30 divisor
- str \rv, [\tmp, #12] @ Save divisor to scratch
- /* uart[UART_LCR] = UART_LCR_WLEN8 | UART_LCR_DLAB; */
- mov \rv, #UART_LCR_WLEN8 | UART_LCR_DLAB
- str \rv, [\rp, #UART_LCR << UART_SHIFT]
- /* uart[UART_DLL] = div & 0xff; */
- ldr \rv, [\tmp, #12]
- and \rv, \rv, #0xff
- str \rv, [\rp, #UART_DLL << UART_SHIFT]
- /* uart[UART_DLM] = div >> 8; */
- ldr \rv, [\tmp, #12]
- lsr \rv, \rv, #8
- str \rv, [\rp, #UART_DLM << UART_SHIFT]
- /* uart[UART_LCR] = UART_LCR_WLEN8; */
- mov \rv, #UART_LCR_WLEN8
- str \rv, [\rp, #UART_LCR << UART_SHIFT]
- b 100f
-
- .align
-99: .word .
- .word tegra_uart_config
- .ltorg
-
- /* Load previously selected UART address */
-100: ldr \rp, [\tmp, #4] @ Load tegra_uart_phys
- ldr \rv, [\tmp, #8] @ Load tegra_uart_virt
- .endm
-
-/*
- * Code below is swiped from <asm/hardware/debug-8250.S>, but add an extra
- * check to make sure that the UART address is actually valid.
- */
-
- .macro senduart, rd, rx
- cmp \rx, #0
- strneb \rd, [\rx, #UART_TX << UART_SHIFT]
-1001:
- .endm
-
- .macro busyuart, rd, rx
- cmp \rx, #0
- beq 1002f
-1001: ldrb \rd, [\rx, #UART_LSR << UART_SHIFT]
- and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
- teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
- bne 1001b
-1002:
- .endm
-
- .macro waituart, rd, rx
-#ifdef FLOW_CONTROL
- cmp \rx, #0
- beq 1002f
-1001: ldrb \rd, [\rx, #UART_MSR << UART_SHIFT]
- tst \rd, #UART_MSR_CTS
- beq 1001b
-1002:
-#endif
- .endm
--
1.7.0.4
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