1 /*
2  * Code commons to all DaVinci SoCs.
3  *
4  * Author: Mark A. Greer <mgreer@mvista.com>
5  *
6  * 2009 (c) MontaVista Software, Inc. This file is licensed under
7  * the terms of the GNU General Public License version 2. This program
8  * is licensed "as is" without any warranty of any kind, whether express
9  * or implied.
10  */
11 #include <linux/module.h>
12 #include <linux/io.h>
13 #include <linux/etherdevice.h>
14 #include <linux/davinci_emac.h>
15 #include <linux/dma-mapping.h>
16 
17 #include <asm/tlb.h>
18 #include <asm/mach/map.h>
19 
20 #include <mach/common.h>
21 #include <mach/cputype.h>
22 
23 struct davinci_soc_info davinci_soc_info;
24 EXPORT_SYMBOL(davinci_soc_info);
25 
davinci_init_id(struct davinci_soc_info * soc_info)26 static int __init davinci_init_id(struct davinci_soc_info *soc_info)
27 {
28 	int			i;
29 	struct davinci_id	*dip;
30 	u8			variant;
31 	u16			part_no;
32 	void __iomem		*base;
33 
34 	base = ioremap(soc_info->jtag_id_reg, SZ_4K);
35 	if (!base) {
36 		pr_err("Unable to map JTAG ID register\n");
37 		return -ENOMEM;
38 	}
39 
40 	soc_info->jtag_id = __raw_readl(base);
41 	iounmap(base);
42 
43 	variant = (soc_info->jtag_id & 0xf0000000) >> 28;
44 	part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;
45 
46 	for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
47 			i++, dip++)
48 		/* Don't care about the manufacturer right now */
49 		if ((dip->part_no == part_no) && (dip->variant == variant)) {
50 			soc_info->cpu_id = dip->cpu_id;
51 			pr_info("DaVinci %s variant 0x%x\n", dip->name,
52 					dip->variant);
53 			return 0;
54 		}
55 
56 	pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
57 	return -EINVAL;
58 }
59 
davinci_common_init(const struct davinci_soc_info * soc_info)60 void __init davinci_common_init(const struct davinci_soc_info *soc_info)
61 {
62 	int ret;
63 
64 	if (!soc_info) {
65 		ret = -EINVAL;
66 		goto err;
67 	}
68 
69 	memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
70 
71 	if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
72 		iotable_init(davinci_soc_info.io_desc,
73 				davinci_soc_info.io_desc_num);
74 
75 	/*
76 	 * Normally devicemaps_init() would flush caches and tlb after
77 	 * mdesc->map_io(), but we must also do it here because of the CPU
78 	 * revision check below.
79 	 */
80 	local_flush_tlb_all();
81 	flush_cache_all();
82 
83 	/*
84 	 * We want to check CPU revision early for cpu_is_xxxx() macros.
85 	 * IO space mapping must be initialized before we can do that.
86 	 */
87 	ret = davinci_init_id(&davinci_soc_info);
88 	if (ret < 0)
89 		goto err;
90 
91 
92 	return;
93 
94 err:
95 	panic("davinci_common_init: SoC Initialization failed\n");
96 }
97 
davinci_init_late(void)98 void __init davinci_init_late(void)
99 {
100 	davinci_cpufreq_init();
101 }
102