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