| /* |
| * 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_7268 REG_PHYS_ADDR(0x40c000) |
| #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, 0x72680000, 7268) |
| 23: checkuart(\rp, \rv, 0x72710000, 7271) |
| 24: checkuart(\rp, \rv, 0x73640000, 7364) |
| 25: checkuart(\rp, \rv, 0x73660000, 7366) |
| 26: checkuart(\rp, \rv, 0x07437100, 74371) |
| 27: checkuart(\rp, \rv, 0x74390000, 7439) |
| 28: 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 |
