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