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

   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_DESCRIPTION("TI CPSW Switch common module");
  94 MODULE_LICENSE("GPL");