drivers/net/ethernet/mscc/ocelot_io.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
   2 /*
   3  * Microsemi Ocelot Switch driver
   4  *
   5  * Copyright (c) 2017 Microsemi Corporation
   6  */
   7 #include <linux/io.h>
   8 #include <linux/kernel.h>
   9 #include <linux/platform_device.h>
  10
  11 #include "ocelot.h"
  12
  13 u32 __ocelot_read_ix(struct ocelot *ocelot, u32 reg, u32 offset)
  14 {
  15         u16 target = reg >> TARGET_OFFSET;
  16         u32 val;
  17
  18         WARN_ON(!target);
  19
  20         regmap_read(ocelot->targets[target],
  21                     ocelot->map[target][reg & REG_MASK] + offset, &val);
  22         return val;
  23 }
  24 EXPORT_SYMBOL(__ocelot_read_ix);
  25
  26 void __ocelot_write_ix(struct ocelot *ocelot, u32 val, u32 reg, u32 offset)
  27 {
  28         u16 target = reg >> TARGET_OFFSET;
  29
  30         WARN_ON(!target);
  31
  32         regmap_write(ocelot->targets[target],
  33                      ocelot->map[target][reg & REG_MASK] + offset, val);
  34 }
  35 EXPORT_SYMBOL(__ocelot_write_ix);
  36
  37 void __ocelot_rmw_ix(struct ocelot *ocelot, u32 val, u32 mask, u32 reg,
  38                      u32 offset)
  39 {
  40         u16 target = reg >> TARGET_OFFSET;
  41
  42         WARN_ON(!target);
  43
  44         regmap_update_bits(ocelot->targets[target],
  45                            ocelot->map[target][reg & REG_MASK] + offset,
  46                            mask, val);
  47 }
  48 EXPORT_SYMBOL(__ocelot_rmw_ix);
  49
  50 u32 ocelot_port_readl(struct ocelot_port *port, u32 reg)
  51 {
  52         struct ocelot *ocelot = port->ocelot;
  53         u16 target = reg >> TARGET_OFFSET;
  54         u32 val;
  55
  56         WARN_ON(!target);
  57
  58         regmap_read(port->target, ocelot->map[target][reg & REG_MASK], &val);
  59         return val;
  60 }
  61 EXPORT_SYMBOL(ocelot_port_readl);
  62
  63 void ocelot_port_writel(struct ocelot_port *port, u32 val, u32 reg)
  64 {
  65         struct ocelot *ocelot = port->ocelot;
  66         u16 target = reg >> TARGET_OFFSET;
  67
  68         WARN_ON(!target);
  69
  70         regmap_write(port->target, ocelot->map[target][reg & REG_MASK], val);
  71 }
  72 EXPORT_SYMBOL(ocelot_port_writel);
  73
  74 int ocelot_regfields_init(struct ocelot *ocelot,
  75                           const struct reg_field *const regfields)
  76 {
  77         unsigned int i;
  78         u16 target;
  79
  80         for (i = 0; i < REGFIELD_MAX; i++) {
  81                 struct reg_field regfield = {};
  82                 u32 reg = regfields[i].reg;
  83
  84                 if (!reg)
  85                         continue;
  86
  87                 target = regfields[i].reg >> TARGET_OFFSET;
  88
  89                 regfield.reg = ocelot->map[target][reg & REG_MASK];
  90                 regfield.lsb = regfields[i].lsb;
  91                 regfield.msb = regfields[i].msb;
  92                 regfield.id_size = regfields[i].id_size;
  93                 regfield.id_offset = regfields[i].id_offset;
  94
  95                 ocelot->regfields[i] =
  96                 devm_regmap_field_alloc(ocelot->dev,
  97                                         ocelot->targets[target],
  98                                         regfield);
  99
 100                 if (IS_ERR(ocelot->regfields[i]))
 101                         return PTR_ERR(ocelot->regfields[i]);
 102         }
 103
 104         return 0;
 105 }
 106 EXPORT_SYMBOL(ocelot_regfields_init);
 107
 108 static struct regmap_config ocelot_regmap_config = {
 109         .reg_bits       = 32,
 110         .val_bits       = 32,
 111         .reg_stride     = 4,
 112 };
 113
 114 struct regmap *ocelot_regmap_init(struct ocelot *ocelot, struct resource *res)
 115 {
 116         void __iomem *regs;
 117
 118         regs = devm_ioremap_resource(ocelot->dev, res);
 119         if (IS_ERR(regs))
 120                 return ERR_CAST(regs);
 121
 122         ocelot_regmap_config.name = res->name;
 123
 124         return devm_regmap_init_mmio(ocelot->dev, regs, &ocelot_regmap_config);
 125 }
 126 EXPORT_SYMBOL(ocelot_regmap_init);