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6bce3dea AB |
1 | // SPDX-License-Identifier: (GPL-2.0 OR MIT) |
2 | /* | |
3 | * Microsemi MIPS SoC support | |
4 | * | |
5 | * Copyright (c) 2017 Microsemi Corporation | |
6 | */ | |
7 | #include <asm/machine.h> | |
8 | #include <asm/prom.h> | |
9 | ||
10 | #define DEVCPU_GCB_CHIP_REGS_CHIP_ID 0x71070000 | |
11 | #define CHIP_ID_PART_ID GENMASK(27, 12) | |
12 | ||
13 | #define OCELOT_PART_ID (0x7514 << 12) | |
14 | ||
15 | #define UART_UART 0x70100000 | |
16 | ||
17 | static __init bool ocelot_detect(void) | |
18 | { | |
19 | u32 rev; | |
20 | int idx; | |
21 | ||
22 | /* Look for the TLB entry set up by redboot before trying to use it */ | |
23 | write_c0_entryhi(DEVCPU_GCB_CHIP_REGS_CHIP_ID); | |
24 | mtc0_tlbw_hazard(); | |
25 | tlb_probe(); | |
26 | tlb_probe_hazard(); | |
27 | idx = read_c0_index(); | |
28 | if (idx < 0) | |
29 | return 0; | |
30 | ||
31 | /* A TLB entry exists, lets assume its usable and check the CHIP ID */ | |
32 | rev = __raw_readl((void __iomem *)DEVCPU_GCB_CHIP_REGS_CHIP_ID); | |
33 | ||
34 | if ((rev & CHIP_ID_PART_ID) != OCELOT_PART_ID) | |
35 | return 0; | |
36 | ||
37 | /* Copy command line from bootloader early for Initrd detection */ | |
38 | if (fw_arg0 < 10 && (fw_arg1 & 0xFFF00000) == 0x80000000) { | |
39 | unsigned int prom_argc = fw_arg0; | |
40 | const char **prom_argv = (const char **)fw_arg1; | |
41 | ||
42 | if (prom_argc > 1 && strlen(prom_argv[1]) > 0) | |
43 | /* ignore all built-in args if any f/w args given */ | |
44 | strcpy(arcs_cmdline, prom_argv[1]); | |
45 | } | |
46 | ||
47 | return 1; | |
48 | } | |
49 | ||
50 | static void __init ocelot_earlyprintk_init(void) | |
51 | { | |
52 | void __iomem *uart_base; | |
53 | ||
54 | uart_base = ioremap_nocache(UART_UART, 0x20); | |
55 | setup_8250_early_printk_port((unsigned long)uart_base, 2, 50000); | |
56 | } | |
57 | ||
58 | static void __init ocelot_late_init(void) | |
59 | { | |
60 | ocelot_earlyprintk_init(); | |
61 | } | |
62 | ||
63 | static __init const void *ocelot_fixup_fdt(const void *fdt, | |
64 | const void *match_data) | |
65 | { | |
66 | /* This has to be done so late because ioremap needs to work */ | |
67 | late_time_init = ocelot_late_init; | |
68 | ||
69 | return fdt; | |
70 | } | |
71 | ||
72 | extern char __dtb_ocelot_pcb123_begin[]; | |
73 | ||
74 | MIPS_MACHINE(ocelot) = { | |
75 | .fdt = __dtb_ocelot_pcb123_begin, | |
76 | .fixup_fdt = ocelot_fixup_fdt, | |
77 | .detect = ocelot_detect, | |
78 | }; |