1// SPDX-License-Identifier: GPL-2.0+
2
3#include <linux/kernel.h>
4#include <linux/module.h>
5#include <linux/of.h>
6#include <linux/of_device.h>
7#include <linux/regmap.h>
8#include <linux/mfd/syscon.h>
9
10#include "cpsw.h"
11
12#define CTRL_MAC_LO_REG(offset, id) ((offset) + 0x8 * (id))
13#define CTRL_MAC_HI_REG(offset, id) ((offset) + 0x8 * (id) + 0x4)
14
15static int davinci_emac_3517_get_macid(struct device *dev, u16 offset,
16				       int slave, u8 *mac_addr)
17{
18	u32 macid_lsb;
19	u32 macid_msb;
20	struct regmap *syscon;
21
22	syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
23	if (IS_ERR(syscon)) {
24		if (PTR_ERR(syscon) == -ENODEV)
25			return 0;
26		return PTR_ERR(syscon);
27	}
28
29	regmap_read(syscon, CTRL_MAC_LO_REG(offset, slave), &macid_lsb);
30	regmap_read(syscon, CTRL_MAC_HI_REG(offset, slave), &macid_msb);
31
32	mac_addr[0] = (macid_msb >> 16) & 0xff;
33	mac_addr[1] = (macid_msb >> 8)  & 0xff;
34	mac_addr[2] = macid_msb & 0xff;
35	mac_addr[3] = (macid_lsb >> 16) & 0xff;
36	mac_addr[4] = (macid_lsb >> 8)  & 0xff;
37	mac_addr[5] = macid_lsb & 0xff;
38
39	return 0;
40}
41
42static int cpsw_am33xx_cm_get_macid(struct device *dev, u16 offset, int slave,
43				    u8 *mac_addr)
44{
45	u32 macid_lo;
46	u32 macid_hi;
47	struct regmap *syscon;
48
49	syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
50	if (IS_ERR(syscon)) {
51		if (PTR_ERR(syscon) == -ENODEV)
52			return 0;
53		return PTR_ERR(syscon);
54	}
55
56	regmap_read(syscon, CTRL_MAC_LO_REG(offset, slave), &macid_lo);
57	regmap_read(syscon, CTRL_MAC_HI_REG(offset, slave), &macid_hi);
58
59	mac_addr[5] = (macid_lo >> 8) & 0xff;
60	mac_addr[4] = macid_lo & 0xff;
61	mac_addr[3] = (macid_hi >> 24) & 0xff;
62	mac_addr[2] = (macid_hi >> 16) & 0xff;
63	mac_addr[1] = (macid_hi >> 8) & 0xff;
64	mac_addr[0] = macid_hi & 0xff;
65
66	return 0;
67}
68
69int ti_cm_get_macid(struct device *dev, int slave, u8 *mac_addr)
70{
71	if (of_machine_is_compatible("ti,dm8148"))
72		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
73
74	if (of_machine_is_compatible("ti,am33xx"))
75		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
76
77	if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
78		return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr);
79
80	if (of_device_is_compatible(dev->of_node, "ti,dm816-emac"))
81		return cpsw_am33xx_cm_get_macid(dev, 0x30, slave, mac_addr);
82
83	if (of_machine_is_compatible("ti,am43"))
84		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
85
86	if (of_machine_is_compatible("ti,dra7"))
87		return davinci_emac_3517_get_macid(dev, 0x514, slave, mac_addr);
88
89	dev_info(dev, "incompatible machine/device type for reading mac address\n");
90	return -ENOENT;
91}
92EXPORT_SYMBOL_GPL(ti_cm_get_macid);
93
94MODULE_LICENSE("GPL");
95