1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (C) 2016 Broadcom */
3 #include <linux/serial_reg.h>
4 #include <asm/cputype.h>
6 /* Physical register offset and virtual register offset */
7 #define REG_PHYS_BASE 0xf0000000
8 #define REG_PHYS_BASE_V7 0x08000000
9 #define REG_VIRT_BASE 0xfc000000
10 #define REG_PHYS_ADDR(x) ((x) + REG_PHYS_BASE)
11 #define REG_PHYS_ADDR_V7(x) ((x) + REG_PHYS_BASE_V7)
13 /* Product id can be read from here */
14 #define SUN_TOP_CTRL_BASE REG_PHYS_ADDR(0x404000)
15 #define SUN_TOP_CTRL_BASE_V7 REG_PHYS_ADDR_V7(0x404000)
17 #define UARTA_3390 REG_PHYS_ADDR(0x40a900)
18 #define UARTA_72116 UARTA_7255
19 #define UARTA_7250 REG_PHYS_ADDR(0x40b400)
20 #define UARTA_7255 REG_PHYS_ADDR(0x40c000)
21 #define UARTA_7260 UARTA_7255
22 #define UARTA_7268 UARTA_7255
23 #define UARTA_7271 UARTA_7268
24 #define UARTA_7278 REG_PHYS_ADDR_V7(0x40c000)
25 #define UARTA_7216 UARTA_7278
26 #define UARTA_72164 UARTA_7278
27 #define UARTA_72165 UARTA_7278
28 #define UARTA_7364 REG_PHYS_ADDR(0x40b000)
29 #define UARTA_7366 UARTA_7364
30 #define UARTA_74371 REG_PHYS_ADDR(0x406b00)
31 #define UARTA_7439 REG_PHYS_ADDR(0x40a900)
32 #define UARTA_7445 REG_PHYS_ADDR(0x40ab00)
36 #define checkuart(rp, rv, family_id, family) \
37 /* Load family id */ \
38 ldr rp, =family_id ; \
39 /* Compare SUN_TOP_CTRL value against it */ \
41 /* Passed test, load address */ \
42 ldreq rp, =UARTA_##family ; \
43 /* Jump to save UART address */ \
46 .macro addruart, rp, rv, tmp
47 adr \rp, 99f @ actual addr of 99f
48 ldr \rv, [\rp] @ linked addr is stored there
49 sub \rv, \rv, \rp @ offset between the two
50 ldr \rp, [\rp, #4] @ linked brcmstb_uart_config
51 sub \tmp, \rp, \rv @ actual brcmstb_uart_config
52 ldr \rp, [\tmp] @ Load brcmstb_uart_config
53 cmp \rp, #1 @ needs initialization?
54 bne 100f @ no; go load the addresses
55 mov \rv, #0 @ yes; record init is done
58 /* Check for V7 memory map if B53 */
59 mrc p15, 0, \rv, c0, c0, 0 @ get Main ID register
60 ldr \rp, =ARM_CPU_PART_MASK
62 ldr \rp, =ARM_CPU_PART_BRAHMA_B53 @ check for B53 CPU
66 /* if PERIPHBASE doesn't overlap REG_PHYS_BASE use V7 map */
67 mrc p15, 1, \rv, c15, c3, 0 @ get PERIPHBASE from CBAR
68 ands \rv, \rv, #REG_PHYS_BASE
69 ldreq \rp, =SUN_TOP_CTRL_BASE_V7
71 /* Check SUN_TOP_CTRL base */
72 10: ldrne \rp, =SUN_TOP_CTRL_BASE @ load SUN_TOP_CTRL PA
73 ldr \rv, [\rp, #0] @ get register contents
74 ARM_BE8( rev \rv, \rv )
75 and \rv, \rv, #0xffffff00 @ strip revision bits [7:0]
77 /* Chip specific detection starts here */
78 20: checkuart(\rp, \rv, 0x33900000, 3390)
79 21: checkuart(\rp, \rv, 0x07211600, 72116)
80 22: checkuart(\rp, \rv, 0x72160000, 7216)
81 23: checkuart(\rp, \rv, 0x07216400, 72164)
82 24: checkuart(\rp, \rv, 0x07216500, 72165)
83 25: checkuart(\rp, \rv, 0x72500000, 7250)
84 26: checkuart(\rp, \rv, 0x72550000, 7255)
85 27: checkuart(\rp, \rv, 0x72600000, 7260)
86 28: checkuart(\rp, \rv, 0x72680000, 7268)
87 29: checkuart(\rp, \rv, 0x72710000, 7271)
88 30: checkuart(\rp, \rv, 0x72780000, 7278)
89 31: checkuart(\rp, \rv, 0x73640000, 7364)
90 32: checkuart(\rp, \rv, 0x73660000, 7366)
91 33: checkuart(\rp, \rv, 0x07437100, 74371)
92 34: checkuart(\rp, \rv, 0x74390000, 7439)
93 35: checkuart(\rp, \rv, 0x74450000, 7445)
95 /* No valid UART found */
99 /* Record whichever UART we chose */
100 91: str \rp, [\tmp, #4] @ Store in brcmstb_uart_phys
101 cmp \rp, #0 @ Valid UART address?
102 bne 92f @ Yes, go process it
103 str \rp, [\tmp, #8] @ Store 0 in brcmstb_uart_virt
105 92: and \rv, \rp, #0xffffff @ offset within 16MB section
106 add \rv, \rv, #REG_VIRT_BASE
107 str \rv, [\tmp, #8] @ Store in brcmstb_uart_virt
112 .word brcmstb_uart_config
115 /* Load previously selected UART address */
116 100: ldr \rp, [\tmp, #4] @ Load brcmstb_uart_phys
117 ldr \rv, [\tmp, #8] @ Load brcmstb_uart_virt
120 .macro store, rd, rx:vararg
121 ARM_BE8( rev \rd, \rd )
125 .macro load, rd, rx:vararg
127 ARM_BE8( rev \rd, \rd )
130 .macro senduart,rd,rx
131 store \rd, [\rx, #UART_TX << UART_SHIFT]
134 .macro busyuart,rd,rx
135 1002: load \rd, [\rx, #UART_LSR << UART_SHIFT]
136 and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
137 teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
141 .macro waituarttxrdy,rd,rx
144 .macro waituartcts,rd,rx
148 * Storage for the state maintained by the macros above.
150 * In the kernel proper, this data is located in arch/arm/mach-bcm/brcmstb.c.
151 * That's because this header is included from multiple files, and we only
152 * want a single copy of the data. In particular, the UART probing code above
153 * assumes it's running using physical addresses. This is true when this file
154 * is included from head.o, but not when included from debug.o. So we need
155 * to share the probe results between the two copies, rather than having
156 * to re-run the probing again later.
158 * In the decompressor, we put the symbol/storage right here, since common.c
159 * isn't included in the decompressor build. This symbol gets put in .text
160 * even though it's really data, since .data is discarded from the
161 * decompressor. Luckily, .text is writeable in the decompressor, unless
162 * CONFIG_ZBOOT_ROM. That dependency is handled in arch/arm/Kconfig.debug.
166 /* Debug UART initialization required */
168 /* Debug UART physical address */
170 /* Debug UART virtual address */