MAINTAINERS: Remove deleted platform efm32
[linux-2.6-microblaze.git] / arch / c6x / kernel / soc.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Miscellaneous SoC-specific hooks.
4  *
5  *  Copyright (C) 2011 Texas Instruments Incorporated
6  *  Author: Mark Salter <msalter@redhat.com>
7  */
8 #include <linux/module.h>
9 #include <linux/ctype.h>
10 #include <linux/etherdevice.h>
11 #include <asm/setup.h>
12 #include <asm/soc.h>
13
14 struct soc_ops soc_ops;
15
16 int soc_get_exception(void)
17 {
18         if (!soc_ops.get_exception)
19                 return -1;
20         return soc_ops.get_exception();
21 }
22
23 void soc_assert_event(unsigned int evt)
24 {
25         if (soc_ops.assert_event)
26                 soc_ops.assert_event(evt);
27 }
28
29 static u8 cmdline_mac[6];
30
31 static int __init get_mac_addr_from_cmdline(char *str)
32 {
33         int count, i, val;
34
35         for (count = 0; count < 6 && *str; count++, str += 3) {
36                 if (!isxdigit(str[0]) || !isxdigit(str[1]))
37                         return 0;
38                 if (str[2] != ((count < 5) ? ':' : '\0'))
39                         return 0;
40
41                 for (i = 0, val = 0; i < 2; i++) {
42                         val = val << 4;
43                         val |= isdigit(str[i]) ?
44                                 str[i] - '0' : toupper(str[i]) - 'A' + 10;
45                 }
46                 cmdline_mac[count] = val;
47         }
48         return 1;
49 }
50 __setup("emac_addr=", get_mac_addr_from_cmdline);
51
52 /*
53  * Setup the MAC address for SoC ethernet devices.
54  *
55  * Before calling this function, the ethernet driver will have
56  * initialized the addr with local-mac-address from the device
57  * tree (if found). Allow command line to override, but not
58  * the fused address.
59  */
60 int soc_mac_addr(unsigned int index, u8 *addr)
61 {
62         int i, have_dt_mac = 0, have_cmdline_mac = 0, have_fuse_mac = 0;
63
64         for (i = 0; i < 6; i++) {
65                 if (cmdline_mac[i])
66                         have_cmdline_mac = 1;
67                 if (c6x_fuse_mac[i])
68                         have_fuse_mac = 1;
69                 if (addr[i])
70                         have_dt_mac = 1;
71         }
72
73         /* cmdline overrides all */
74         if (have_cmdline_mac)
75                 memcpy(addr, cmdline_mac, 6);
76         else if (!have_dt_mac) {
77                 if (have_fuse_mac)
78                         memcpy(addr, c6x_fuse_mac, 6);
79                 else
80                         eth_random_addr(addr);
81         }
82
83         /* adjust for specific EMAC device */
84         addr[5] += index * c6x_num_cores;
85         return 1;
86 }
87 EXPORT_SYMBOL_GPL(soc_mac_addr);