146 lines
4.6 KiB
ArmAsm
146 lines
4.6 KiB
ArmAsm
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/*
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* Copyright (C) 2016 Broadcom
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/serial_reg.h>
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/* Physical register offset and virtual register offset */
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#define REG_PHYS_BASE 0xf0000000
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#define REG_VIRT_BASE 0xfc000000
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#define REG_PHYS_ADDR(x) ((x) + REG_PHYS_BASE)
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/* Product id can be read from here */
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#define SUN_TOP_CTRL_BASE REG_PHYS_ADDR(0x404000)
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#define UARTA_3390 REG_PHYS_ADDR(0x40a900)
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#define UARTA_7250 REG_PHYS_ADDR(0x40b400)
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#define UARTA_7268 REG_PHYS_ADDR(0x40c000)
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#define UARTA_7271 UARTA_7268
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#define UARTA_7364 REG_PHYS_ADDR(0x40b000)
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#define UARTA_7366 UARTA_7364
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#define UARTA_74371 REG_PHYS_ADDR(0x406b00)
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#define UARTA_7439 REG_PHYS_ADDR(0x40a900)
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#define UARTA_7445 REG_PHYS_ADDR(0x40ab00)
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#define UART_SHIFT 2
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#define checkuart(rp, rv, family_id, family) \
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/* Load family id */ \
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ldr rp, =family_id ; \
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/* Compare SUN_TOP_CTRL value against it */ \
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cmp rp, rv ; \
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/* Passed test, load address */ \
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ldreq rp, =UARTA_##family ; \
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/* Jump to save UART address */ \
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beq 91f
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.macro addruart, rp, rv, tmp
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adr \rp, 99f @ actual addr of 99f
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ldr \rv, [\rp] @ linked addr is stored there
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sub \rv, \rv, \rp @ offset between the two
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ldr \rp, [\rp, #4] @ linked brcmstb_uart_config
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sub \tmp, \rp, \rv @ actual brcmstb_uart_config
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ldr \rp, [\tmp] @ Load brcmstb_uart_config
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cmp \rp, #1 @ needs initialization?
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bne 100f @ no; go load the addresses
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mov \rv, #0 @ yes; record init is done
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str \rv, [\tmp]
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/* Check SUN_TOP_CTRL base */
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ldr \rp, =SUN_TOP_CTRL_BASE @ load SUN_TOP_CTRL PA
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ldr \rv, [\rp, #0] @ get register contents
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and \rv, \rv, #0xffffff00 @ strip revision bits [7:0]
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/* Chip specific detection starts here */
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20: checkuart(\rp, \rv, 0x33900000, 3390)
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21: checkuart(\rp, \rv, 0x72500000, 7250)
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22: checkuart(\rp, \rv, 0x72680000, 7268)
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23: checkuart(\rp, \rv, 0x72710000, 7271)
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24: checkuart(\rp, \rv, 0x73640000, 7364)
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25: checkuart(\rp, \rv, 0x73660000, 7366)
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26: checkuart(\rp, \rv, 0x07437100, 74371)
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27: checkuart(\rp, \rv, 0x74390000, 7439)
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28: checkuart(\rp, \rv, 0x74450000, 7445)
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/* No valid UART found */
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90: mov \rp, #0
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/* fall through */
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/* Record whichever UART we chose */
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91: str \rp, [\tmp, #4] @ Store in brcmstb_uart_phys
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cmp \rp, #0 @ Valid UART address?
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bne 92f @ Yes, go process it
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str \rp, [\tmp, #8] @ Store 0 in brcmstb_uart_virt
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b 100f @ Done
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92: and \rv, \rp, #0xffffff @ offset within 16MB section
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add \rv, \rv, #REG_VIRT_BASE
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str \rv, [\tmp, #8] @ Store in brcmstb_uart_virt
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b 100f
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.align
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99: .word .
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.word brcmstb_uart_config
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.ltorg
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/* Load previously selected UART address */
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100: ldr \rp, [\tmp, #4] @ Load brcmstb_uart_phys
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ldr \rv, [\tmp, #8] @ Load brcmstb_uart_virt
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.endm
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.macro store, rd, rx:vararg
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str \rd, \rx
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.endm
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.macro load, rd, rx:vararg
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ldr \rd, \rx
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.endm
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.macro senduart,rd,rx
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store \rd, [\rx, #UART_TX << UART_SHIFT]
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.endm
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.macro busyuart,rd,rx
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1002: load \rd, [\rx, #UART_LSR << UART_SHIFT]
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and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
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teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
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bne 1002b
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.endm
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.macro waituart,rd,rx
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.endm
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/*
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* Storage for the state maintained by the macros above.
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*
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* In the kernel proper, this data is located in arch/arm/mach-bcm/brcmstb.c.
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* That's because this header is included from multiple files, and we only
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* want a single copy of the data. In particular, the UART probing code above
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* assumes it's running using physical addresses. This is true when this file
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* is included from head.o, but not when included from debug.o. So we need
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* to share the probe results between the two copies, rather than having
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* to re-run the probing again later.
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*
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* In the decompressor, we put the symbol/storage right here, since common.c
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* isn't included in the decompressor build. This symbol gets put in .text
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* even though it's really data, since .data is discarded from the
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* decompressor. Luckily, .text is writeable in the decompressor, unless
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* CONFIG_ZBOOT_ROM. That dependency is handled in arch/arm/Kconfig.debug.
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*/
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#if defined(ZIMAGE)
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brcmstb_uart_config:
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/* Debug UART initialization required */
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.word 1
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/* Debug UART physical address */
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.word 0
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/* Debug UART virtual address */
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.word 0
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#endif
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