1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Code commons to all DaVinci SoCs. |
4 | * |
5 | * Author: Mark A. Greer <mgreer@mvista.com> |
6 | * |
7 | * 2009 (c) MontaVista Software, Inc. |
8 | */ |
9 | #include <linux/module.h> |
10 | #include <linux/io.h> |
11 | #include <linux/etherdevice.h> |
12 | #include <linux/davinci_emac.h> |
13 | #include <linux/dma-mapping.h> |
14 | #include <linux/platform_data/davinci-cpufreq.h> |
15 | |
16 | #include <asm/tlb.h> |
17 | #include <asm/mach/map.h> |
18 | |
19 | #include "common.h" |
20 | #include "cputype.h" |
21 | |
22 | struct davinci_soc_info davinci_soc_info; |
23 | EXPORT_SYMBOL(davinci_soc_info); |
24 | |
25 | static int __init davinci_init_id(struct davinci_soc_info *soc_info) |
26 | { |
27 | int i; |
28 | struct davinci_id *dip; |
29 | u8 variant; |
30 | u16 part_no; |
31 | void __iomem *base; |
32 | |
33 | base = ioremap(offset: soc_info->jtag_id_reg, SZ_4K); |
34 | if (!base) { |
35 | pr_err("Unable to map JTAG ID register\n" ); |
36 | return -ENOMEM; |
37 | } |
38 | |
39 | soc_info->jtag_id = __raw_readl(addr: base); |
40 | iounmap(addr: base); |
41 | |
42 | variant = (soc_info->jtag_id & 0xf0000000) >> 28; |
43 | part_no = (soc_info->jtag_id & 0x0ffff000) >> 12; |
44 | |
45 | for (i = 0, dip = soc_info->ids; i < soc_info->ids_num; |
46 | i++, dip++) |
47 | /* Don't care about the manufacturer right now */ |
48 | if ((dip->part_no == part_no) && (dip->variant == variant)) { |
49 | soc_info->cpu_id = dip->cpu_id; |
50 | pr_info("DaVinci %s variant 0x%x\n" , dip->name, |
51 | dip->variant); |
52 | return 0; |
53 | } |
54 | |
55 | pr_err("Unknown DaVinci JTAG ID 0x%x\n" , soc_info->jtag_id); |
56 | return -EINVAL; |
57 | } |
58 | |
59 | void __init davinci_common_init(const struct davinci_soc_info *soc_info) |
60 | { |
61 | int ret; |
62 | |
63 | if (!soc_info) { |
64 | ret = -EINVAL; |
65 | goto err; |
66 | } |
67 | |
68 | memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info)); |
69 | |
70 | if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0)) |
71 | iotable_init(davinci_soc_info.io_desc, |
72 | davinci_soc_info.io_desc_num); |
73 | |
74 | /* |
75 | * Normally devicemaps_init() would flush caches and tlb after |
76 | * mdesc->map_io(), but we must also do it here because of the CPU |
77 | * revision check below. |
78 | */ |
79 | local_flush_tlb_all(); |
80 | flush_cache_all(); |
81 | |
82 | /* |
83 | * We want to check CPU revision early for cpu_is_xxxx() macros. |
84 | * IO space mapping must be initialized before we can do that. |
85 | */ |
86 | ret = davinci_init_id(soc_info: &davinci_soc_info); |
87 | if (ret < 0) |
88 | goto err; |
89 | |
90 | |
91 | return; |
92 | |
93 | err: |
94 | panic(fmt: "davinci_common_init: SoC Initialization failed\n" ); |
95 | } |
96 | |
97 | void __init davinci_init_late(void) |
98 | { |
99 | davinci_cpufreq_init(); |
100 | } |
101 | |