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 
14 static 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 
41 static 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 
68 int 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 }
91 EXPORT_SYMBOL_GPL(ti_cm_get_macid);
92 
93 MODULE_LICENSE("GPL");
94