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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 4906d698d3960b70cf8000299da35412efd4f51d / . / board / atmel / common / mac-spi-nor.c
blob: ced27b65e63b8feb68b2537692503311bada5ab1 [file] [log] [blame]
Tudor Ambarusf10b4002019-11-13 15:42:54 +0000[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2019 Microchip Technology Inc. and its subsidiaries
4 *
5 * Author: Tudor Ambarus <tudor.ambarus@microchip.com>
6 */
7
8#include <common.h>
9#include <dm.h>
10#include <env.h>
Simon Glass90526e92020-05-10 11:39:56 -0600[diff] [blame]11#include <net.h>
Tudor Ambarusf10b4002019-11-13 15:42:54 +0000[diff] [blame]12#include <linux/mtd/spi-nor.h>
13#include <netdev.h>
14
15#define ETH_ADDR_SIZE 6
16
17#ifdef CONFIG_SPI_FLASH_SST
18#define SFDP_MICROCHIP_MANUF_ID 0xbf
19#define SFDP_MICROCHIP_MEM_TYPE 0x26
20#define SFDP_MICROCHIP_DEV_ID 0x43
21
22#define SFDP_MICROCHIP_EUI_OFFSET 0x60
23#define SFDP_MICROCHIP_EUI48 0x30
24
25struct sst26vf064beui {
26 u8 manufacturer_id;
27 u8 memory_type;
28 u8 device_id;
29 u8 reserved;
30};
31
32/**
33 * sst26vf064beui_check() - Check the validity of the EUI-48 information from
34 * the sst26vf064beui SPI NOR Microchip SFDP table.
35 * @manufacturer_sfdp: pointer to the Microchip manufacturer specific SFDP
36 * table.
37 *
38 * Return: 0 on success, -errno otherwise.
39 */
40static int sst26vf064beui_check(const u8 *manufacturer_sfdp)
41{
42 struct sst26vf064beui *sst26vf064beui =
43 (struct sst26vf064beui *)manufacturer_sfdp;
44
45 if (sst26vf064beui->manufacturer_id != SFDP_MICROCHIP_MANUF_ID)
46 return -EINVAL;
47
48 if (sst26vf064beui->memory_type != SFDP_MICROCHIP_MEM_TYPE)
49 return -EINVAL;
50
51 if (sst26vf064beui->device_id != SFDP_MICROCHIP_DEV_ID)
52 return -EINVAL;
53
54 /*
55 * Check if the EUI-48 MAC address is programmed in the next six address
56 * locations.
57 */
58 if (manufacturer_sfdp[SFDP_MICROCHIP_EUI_OFFSET] !=
59 SFDP_MICROCHIP_EUI48)
60 return -EINVAL;
61
62 return 0;
63}
64
65/**
66 * sst26vf064beui_get_ethaddr() - Get the ethernet address from the
67 * sst26vf064beui SPI NOR Microchip SFDP table.
68 * @manufacturer_sfdp: pointer to the Microchip manufacturer specific SFDP
69 * table.
70 * @ethaddr: pointer where to fill the ethernet address
71 * @size: size of the ethernet address.
72 *
73 * Return: 0 on success, -errno otherwise.
74 */
75static int sst26vf064beui_get_ethaddr(const u8 *manufacturer_sfdp,
76 u8 *ethaddr, size_t size)
77{
78 u64 eui_table[2];
79 u64 *p = (u64 *)&manufacturer_sfdp[SFDP_MICROCHIP_EUI_OFFSET];
80 int i, ret;
81
82 ret = sst26vf064beui_check(manufacturer_sfdp);
83 if (ret)
84 return ret;
85
86 for (i = 0; i < 2; i++)
87 eui_table[i] = le64_to_cpu(p[i]);
88
89 /* Ethaddr starts at offset one. */
90 memcpy(ethaddr, &((u8 *)eui_table)[1], size);
91
92 return 0;
93}
94#endif
95
96/**
97 * at91_spi_nor_set_ethaddr() - Retrieve and set the ethernet address from the
98 * SPI NOR manufacturer specific SFDP table.
99 */
100void at91_spi_nor_set_ethaddr(void)
101{
102 struct udevice *dev;
103 struct spi_nor *nor;
104 const char *ethaddr_name = "ethaddr";
105 u8 ethaddr[ETH_ADDR_SIZE] = {0};
106
107 if (env_get(ethaddr_name))
108 return;
109
110 if (uclass_first_device_err(UCLASS_SPI_FLASH, &dev))
111 return;
112
113 nor = dev_get_uclass_priv(dev);
114 if (!nor)
115 return;
116
117 if (!nor->manufacturer_sfdp)
118 return;
119
120#ifdef CONFIG_SPI_FLASH_SST
121 if (sst26vf064beui_get_ethaddr(nor->manufacturer_sfdp, ethaddr,
122 ETH_ADDR_SIZE))
123 return;
124#endif
125
126 if (is_valid_ethaddr(ethaddr))
127 eth_env_set_enetaddr(ethaddr_name, ethaddr);
128}