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