drivers/net/ethernet/ti/cpsw-common.c

   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");