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/*
* Copyright (C) 2016 Broadcom
*
* 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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; 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>
/* Physical register offset and virtual register offset */
#define REG_PHYS_BASE 0xf0000000
#define REG_VIRT_BASE 0xfc000000
#define REG_PHYS_ADDR(x) ((x) + REG_PHYS_BASE)
/* Product id can be read from here */
#define SUN_TOP_CTRL_BASE REG_PHYS_ADDR(0x404000)
#define UARTA_3390 REG_PHYS_ADDR(0x40a900)
#define UARTA_7250 REG_PHYS_ADDR(0x40b400)
#define UARTA_7260 REG_PHYS_ADDR(0x40c000)
#define UARTA_7268 UARTA_7260
#define UARTA_7271 UARTA_7268
#define UARTA_7364 REG_PHYS_ADDR(0x40b000)
#define UARTA_7366 UARTA_7364
#define UARTA_74371 REG_PHYS_ADDR(0x406b00)
#define UARTA_7439 REG_PHYS_ADDR(0x40a900)
#define UARTA_7445 REG_PHYS_ADDR(0x40ab00)
#define UART_SHIFT 2
#define checkuart(rp, rv, family_id, family) \
/* Load family id */ \
ldr rp, =family_id ; \
/* Compare SUN_TOP_CTRL value against it */ \
cmp rp, rv ; \
/* Passed test, load address */ \
ldreq rp, =UARTA_##family ; \
/* Jump to save UART address */ \
beq 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 brcmstb_uart_config
sub \tmp, \rp, \rv @ actual brcmstb_uart_config
ldr \rp, [\tmp] @ Load brcmstb_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]
/* Check SUN_TOP_CTRL base */
ldr \rp, =SUN_TOP_CTRL_BASE @ load SUN_TOP_CTRL PA
ldr \rv, [\rp, #0] @ get register contents
and \rv, \rv, #0xffffff00 @ strip revision bits [7:0]
/* Chip specific detection starts here */
20: checkuart(\rp, \rv, 0x33900000, 3390)
21: checkuart(\rp, \rv, 0x72500000, 7250)
22: checkuart(\rp, \rv, 0x72600000, 7260)
23: checkuart(\rp, \rv, 0x72680000, 7268)
24: checkuart(\rp, \rv, 0x72710000, 7271)
25: checkuart(\rp, \rv, 0x73640000, 7364)
26: checkuart(\rp, \rv, 0x73660000, 7366)
27: checkuart(\rp, \rv, 0x07437100, 74371)
28: checkuart(\rp, \rv, 0x74390000, 7439)
29: checkuart(\rp, \rv, 0x74450000, 7445)
/* No valid UART found */
90: mov \rp, #0
/* fall through */
/* Record whichever UART we chose */
91: str \rp, [\tmp, #4] @ Store in brcmstb_uart_phys
cmp \rp, #0 @ Valid UART address?
bne 92f @ Yes, go process it
str \rp, [\tmp, #8] @ Store 0 in brcmstb_uart_virt
b 100f @ Done
92: and \rv, \rp, #0xffffff @ offset within 16MB section
add \rv, \rv, #REG_VIRT_BASE
str \rv, [\tmp, #8] @ Store in brcmstb_uart_virt
b 100f
.align
99: .word .
.word brcmstb_uart_config
.ltorg
/* Load previously selected UART address */
100: ldr \rp, [\tmp, #4] @ Load brcmstb_uart_phys
ldr \rv, [\tmp, #8] @ Load brcmstb_uart_virt
.endm
.macro store, rd, rx:vararg
str \rd, \rx
.endm
.macro load, rd, rx:vararg
ldr \rd, \rx
.endm
.macro senduart,rd,rx
store \rd, [\rx, #UART_TX << UART_SHIFT]
.endm
.macro busyuart,rd,rx
1002: load \rd, [\rx, #UART_LSR << UART_SHIFT]
and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
bne 1002b
.endm
.macro waituart,rd,rx
.endm
/*
* Storage for the state maintained by the macros above.
*
* In the kernel proper, this data is located in arch/arm/mach-bcm/brcmstb.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 symbol/storage right here, since common.c
* isn't included in the decompressor build. This symbol 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.
*/
#if defined(ZIMAGE)
brcmstb_uart_config:
/* Debug UART initialization required */
.word 1
/* Debug UART physical address */
.word 0
/* Debug UART virtual address */
.word 0
#endif
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