172 lines
5.5 KiB
ArmAsm
172 lines
5.5 KiB
ArmAsm
|
/*
|
||
|
|
* 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>
|
||
|
|
#include <asm/cputype.h>
|
||
|
|
|
||
|
|
/* Physical register offset and virtual register offset */
|
||
|
|
#define REG_PHYS_BASE 0xf0000000
|
||
|
|
#define REG_PHYS_BASE_V7 0x08000000
|
||
|
|
#define REG_VIRT_BASE 0xfc000000
|
||
|
|
#define REG_PHYS_ADDR(x) ((x) + REG_PHYS_BASE)
|
||
|
|
#define REG_PHYS_ADDR_V7(x) ((x) + REG_PHYS_BASE_V7)
|
||
|
|
|
||
|
|
/* Product id can be read from here */
|
||
|
|
#define SUN_TOP_CTRL_BASE REG_PHYS_ADDR(0x404000)
|
||
|
|
#define SUN_TOP_CTRL_BASE_V7 REG_PHYS_ADDR_V7(0x404000)
|
||
|
|
|
||
|
|
#define UARTA_3390 REG_PHYS_ADDR(0x40a900)
|
||
|
|
#define UARTA_7250 REG_PHYS_ADDR(0x40b400)
|
||
|
|
#define UARTA_7255 REG_PHYS_ADDR(0x40c000)
|
||
|
|
#define UARTA_7260 UARTA_7255
|
||
|
|
#define UARTA_7268 UARTA_7255
|
||
|
|
#define UARTA_7271 UARTA_7268
|
||
|
|
#define UARTA_7278 REG_PHYS_ADDR_V7(0x40c000)
|
||
|
|
#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 for V7 memory map if B53 */
|
||
|
|
mrc p15, 0, \rv, c0, c0, 0 @ get Main ID register
|
||
|
|
ldr \rp, =ARM_CPU_PART_MASK
|
||
|
|
and \rv, \rv, \rp
|
||
|
|
ldr \rp, =ARM_CPU_PART_BRAHMA_B53 @ check for B53 CPU
|
||
|
|
cmp \rv, \rp
|
||
|
|
bne 10f
|
||
|
|
|
||
|
|
/* if PERIPHBASE doesn't overlap REG_PHYS_BASE use V7 map */
|
||
|
|
mrc p15, 1, \rv, c15, c3, 0 @ get PERIPHBASE from CBAR
|
||
|
|
ands \rv, \rv, #REG_PHYS_BASE
|
||
|
|
ldreq \rp, =SUN_TOP_CTRL_BASE_V7
|
||
|
|
|
||
|
|
/* Check SUN_TOP_CTRL base */
|
||
|
|
10: ldrne \rp, =SUN_TOP_CTRL_BASE @ load SUN_TOP_CTRL PA
|
||
|
|
ldr \rv, [\rp, #0] @ get register contents
|
||
|
|
ARM_BE8( rev \rv, \rv )
|
||
|
|
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, 0x72550000, 7255)
|
||
|
|
23: checkuart(\rp, \rv, 0x72600000, 7260)
|
||
|
|
24: checkuart(\rp, \rv, 0x72680000, 7268)
|
||
|
|
25: checkuart(\rp, \rv, 0x72710000, 7271)
|
||
|
|
26: checkuart(\rp, \rv, 0x72780000, 7278)
|
||
|
|
27: checkuart(\rp, \rv, 0x73640000, 7364)
|
||
|
|
28: checkuart(\rp, \rv, 0x73660000, 7366)
|
||
|
|
29: checkuart(\rp, \rv, 0x07437100, 74371)
|
||
|
|
30: checkuart(\rp, \rv, 0x74390000, 7439)
|
||
|
|
31: 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
|
||
|
|
ARM_BE8( rev \rd, \rd )
|
||
|
|
str \rd, \rx
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro load, rd, rx:vararg
|
||
|
|
ldr \rd, \rx
|
||
|
|
ARM_BE8( rev \rd, \rd )
|
||
|
|
.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
|