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
davinci_init_id(struct davinci_soc_info * soc_info)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(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(base);
40 iounmap(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
davinci_common_init(const struct davinci_soc_info * soc_info)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(&davinci_soc_info);
87 if (ret < 0)
88 goto err;
89
90
91 return;
92
93 err:
94 panic("davinci_common_init: SoC Initialization failed\n");
95 }
96
davinci_init_late(void)97 void __init davinci_init_late(void)
98 {
99 davinci_cpufreq_init();
100 }
101