1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 2 of the License, or
5  * (at your option) any later version.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  * GNU General Public License for more details.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/of_device.h>
17 #include <linux/regmap.h>
18 #include <linux/mfd/syscon.h>
19 
20 #include "cpsw.h"
21 
22 #define CTRL_MAC_LO_REG(offset, id) ((offset) + 0x8 * (id))
23 #define CTRL_MAC_HI_REG(offset, id) ((offset) + 0x8 * (id) + 0x4)
24 
25 static int davinci_emac_3517_get_macid(struct device *dev, u16 offset,
26 				       int slave, u8 *mac_addr)
27 {
28 	u32 macid_lsb;
29 	u32 macid_msb;
30 	struct regmap *syscon;
31 
32 	syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
33 	if (IS_ERR(syscon)) {
34 		if (PTR_ERR(syscon) == -ENODEV)
35 			return 0;
36 		return PTR_ERR(syscon);
37 	}
38 
39 	regmap_read(syscon, CTRL_MAC_LO_REG(offset, slave), &macid_lsb);
40 	regmap_read(syscon, CTRL_MAC_HI_REG(offset, slave), &macid_msb);
41 
42 	mac_addr[0] = (macid_msb >> 16) & 0xff;
43 	mac_addr[1] = (macid_msb >> 8)  & 0xff;
44 	mac_addr[2] = macid_msb & 0xff;
45 	mac_addr[3] = (macid_lsb >> 16) & 0xff;
46 	mac_addr[4] = (macid_lsb >> 8)  & 0xff;
47 	mac_addr[5] = macid_lsb & 0xff;
48 
49 	return 0;
50 }
51 
52 static int cpsw_am33xx_cm_get_macid(struct device *dev, u16 offset, int slave,
53 				    u8 *mac_addr)
54 {
55 	u32 macid_lo;
56 	u32 macid_hi;
57 	struct regmap *syscon;
58 
59 	syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
60 	if (IS_ERR(syscon)) {
61 		if (PTR_ERR(syscon) == -ENODEV)
62 			return 0;
63 		return PTR_ERR(syscon);
64 	}
65 
66 	regmap_read(syscon, CTRL_MAC_LO_REG(offset, slave), &macid_lo);
67 	regmap_read(syscon, CTRL_MAC_HI_REG(offset, slave), &macid_hi);
68 
69 	mac_addr[5] = (macid_lo >> 8) & 0xff;
70 	mac_addr[4] = macid_lo & 0xff;
71 	mac_addr[3] = (macid_hi >> 24) & 0xff;
72 	mac_addr[2] = (macid_hi >> 16) & 0xff;
73 	mac_addr[1] = (macid_hi >> 8) & 0xff;
74 	mac_addr[0] = macid_hi & 0xff;
75 
76 	return 0;
77 }
78 
79 int ti_cm_get_macid(struct device *dev, int slave, u8 *mac_addr)
80 {
81 	if (of_machine_is_compatible("ti,dm8148"))
82 		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
83 
84 	if (of_machine_is_compatible("ti,am33xx"))
85 		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
86 
87 	if (of_device_is_compatible(dev->of_node, "ti,am3517-emac"))
88 		return davinci_emac_3517_get_macid(dev, 0x110, slave, mac_addr);
89 
90 	if (of_device_is_compatible(dev->of_node, "ti,dm816-emac"))
91 		return cpsw_am33xx_cm_get_macid(dev, 0x30, slave, mac_addr);
92 
93 	if (of_machine_is_compatible("ti,am43"))
94 		return cpsw_am33xx_cm_get_macid(dev, 0x630, slave, mac_addr);
95 
96 	if (of_machine_is_compatible("ti,dra7"))
97 		return davinci_emac_3517_get_macid(dev, 0x514, slave, mac_addr);
98 
99 	dev_info(dev, "incompatible machine/device type for reading mac address\n");
100 	return -ENOENT;
101 }
102 EXPORT_SYMBOL_GPL(ti_cm_get_macid);
103 
104 MODULE_LICENSE("GPL");
105