arch/arm/include/debug/tegra.S - kernel/common - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (C) 2010,2011 Google, Inc.
  * Copyright (C) 2011-2012 NVIDIA CORPORATION. All Rights Reserved.
  *
  * Author:
  *	Colin Cross <[email protected]>
  *	Erik Gilling <[email protected]>
  *	Doug Anderson <[email protected]>
  *	Stephen Warren <[email protected]>
  *
  * Portions based on mach-omap2's debug-macro.S
  * Copyright (C) 1994-1999 Russell King
  */

 #include <linux/serial_reg.h>

 #define UART_SHIFT 2

 /* Physical addresses */
 #define TEGRA_CLK_RESET_BASE		0x60006000
 #define TEGRA_APB_MISC_BASE		0x70000000
 #define TEGRA_UARTA_BASE		0x70006000
 #define TEGRA_UARTB_BASE		0x70006040
 #define TEGRA_UARTC_BASE		0x70006200
 #define TEGRA_UARTD_BASE		0x70006300
 #define TEGRA_UARTE_BASE		0x70006400
 #define TEGRA_PMC_BASE			0x7000e400

 #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)

 /*
  * Must be section-aligned since a section mapping is used early on.
  * Must not overlap with regions in mach-tegra/io.c:tegra_io_desc[].
  */
 #define UART_VIRTUAL_BASE		0xfe800000

 #define checkuart(rp, rv, lhu, bit, uart) \
 		/* Load address of CLK_RST register */ \
 		ldr	rp, =TEGRA_CLK_RST_DEVICES_##lhu ; \
 		/* 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 */ \
 		ldr	rp, =TEGRA_CLK_OUT_ENB_##lhu ; \
 		/* 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 */ \
 		ldr	rp, =TEGRA_UART##uart##_BASE ; \
 		/* 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:		ldr	\rp, =TEGRA_PMC_SCRATCH20
 		ldr	\rp, [\rp, #0]		@ Load PMC_SCRATCH20
 		lsr	\rv, \rp, #18		@ 19:18 are console type
 		and	\rv, \rv, #3
 		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:		lsr	\rv, \rp, #15		@ 17:15 are UART ID
 		and	\rv, #7
 		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_virt
 		b	100f			@ Done
 92:		and	\rv, \rp, #0xffffff	@ offset within 1MB section
 		add	\rv, \rv, #UART_VIRTUAL_BASE
 		str	\rv, [\tmp, #8]		@ Store in tegra_uart_virt
 		b	100f

 		.align
 99:		.word	.
 #if defined(ZIMAGE)
 		.word	. + 4
 /*
  * Storage for the state maintained by the macro.
  *
  * In the kernel proper, this data is located in arch/arm/mach-tegra/tegra.c.
  * That's because this header is included from multiple files, and we only
  * want a single copy of the data. In particular, the UART probing code above
  * assumes it's running using physical addresses. This is true when this file
  * is included from head.o, but not when included from debug.o. So we need
  * to share the probe results between the two copies, rather than having
  * to re-run the probing again later.
  *
  * In the decompressor, we put the storage right here, since common.c
  * isn't included in the decompressor build. This storage data gets put in
  * .text even though it's really data, since .data is discarded from the
  * decompressor. Luckily, .text is writeable in the decompressor, unless
  * CONFIG_ZBOOT_ROM. That dependency is handled in arch/arm/Kconfig.debug.
  */
 		/* Debug UART initialization required */
 		.word	1
 		/* Debug UART physical address */
 		.word	0
 		/* Debug UART virtual address */
 		.word	0
 #else
 		.word	tegra_uart_config
 #endif
 		.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
 		strbne	\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_THRE
 		teq	\rd, #UART_LSR_THRE
 		bne	1001b
 1002:
 		.endm

 		.macro	waituartcts, rd, rx
 		cmp	\rx, #0
 		beq	1002f
 1001:		ldrb	\rd, [\rx, #UART_MSR << UART_SHIFT]
 		tst	\rd, #UART_MSR_CTS
 		beq	1001b
 1002:
 		.endm

 		.macro	waituarttxrdy,rd,rx
 		.endm
	/* SPDX-License-Identifier: GPL-2.0-only */
	/*
	* Copyright (C) 2010,2011 Google, Inc.
	* Copyright (C) 2011-2012 NVIDIA CORPORATION. All Rights Reserved.
	*
	* Author:
	* Colin Cross <[email protected]>
	* Erik Gilling <[email protected]>
	* Doug Anderson <[email protected]>
	* Stephen Warren <[email protected]>
	*
	* Portions based on mach-omap2's debug-macro.S
	* Copyright (C) 1994-1999 Russell King
	*/

	#include <linux/serial_reg.h>

	#define UART_SHIFT 2

	/* Physical addresses */
	#define TEGRA_CLK_RESET_BASE 0x60006000
	#define TEGRA_APB_MISC_BASE 0x70000000
	#define TEGRA_UARTA_BASE 0x70006000
	#define TEGRA_UARTB_BASE 0x70006040
	#define TEGRA_UARTC_BASE 0x70006200
	#define TEGRA_UARTD_BASE 0x70006300
	#define TEGRA_UARTE_BASE 0x70006400
	#define TEGRA_PMC_BASE 0x7000e400

	#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)

	/*
	* Must be section-aligned since a section mapping is used early on.
	* Must not overlap with regions in mach-tegra/io.c:tegra_io_desc[].
	*/
	#define UART_VIRTUAL_BASE 0xfe800000

	#define checkuart(rp, rv, lhu, bit, uart) \
	/* Load address of CLK_RST register */ \
	ldr rp, =TEGRA_CLK_RST_DEVICES_##lhu ; \
	/* 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 */ \
	ldr rp, =TEGRA_CLK_OUT_ENB_##lhu ; \
	/* 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 */ \
	ldr rp, =TEGRA_UART##uart##_BASE ; \
	/* 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: ldr \rp, =TEGRA_PMC_SCRATCH20
	ldr \rp, [\rp, #0] @ Load PMC_SCRATCH20
	lsr \rv, \rp, #18 @ 19:18 are console type
	and \rv, \rv, #3
	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: lsr \rv, \rp, #15 @ 17:15 are UART ID
	and \rv, #7
	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_virt
	b 100f @ Done
	92: and \rv, \rp, #0xffffff @ offset within 1MB section
	add \rv, \rv, #UART_VIRTUAL_BASE
	str \rv, [\tmp, #8] @ Store in tegra_uart_virt
	b 100f

	.align
	99: .word .
	#if defined(ZIMAGE)
	.word . + 4
	/*
	* Storage for the state maintained by the macro.
	*
	* In the kernel proper, this data is located in arch/arm/mach-tegra/tegra.c.
	* That's because this header is included from multiple files, and we only
	* want a single copy of the data. In particular, the UART probing code above
	* assumes it's running using physical addresses. This is true when this file
	* is included from head.o, but not when included from debug.o. So we need
	* to share the probe results between the two copies, rather than having
	* to re-run the probing again later.
	*
	* In the decompressor, we put the storage right here, since common.c
	* isn't included in the decompressor build. This storage data gets put in
	* .text even though it's really data, since .data is discarded from the
	* decompressor. Luckily, .text is writeable in the decompressor, unless
	* CONFIG_ZBOOT_ROM. That dependency is handled in arch/arm/Kconfig.debug.
	*/
	/* Debug UART initialization required */
	.word 1
	/* Debug UART physical address */
	.word 0
	/* Debug UART virtual address */
	.word 0
	#else
	.word tegra_uart_config
	#endif
	.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
	strbne \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_THRE
	teq \rd, #UART_LSR_THRE
	bne 1001b
	1002:
	.endm

	.macro waituartcts, rd, rx
	cmp \rx, #0
	beq 1002f
	1001: ldrb \rd, [\rx, #UART_MSR << UART_SHIFT]
	tst \rd, #UART_MSR_CTS
	beq 1001b
	1002:
	.endm

	.macro waituarttxrdy,rd,rx
	.endm