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         return readl(port->regs + reg);
  53 }
  54 EXPORT_SYMBOL(ocelot_port_readl);
  55
  56 void ocelot_port_writel(struct ocelot_port *port, u32 val, u32 reg)
  57 {
  58         writel(val, port->regs + reg);
  59 }
  60 EXPORT_SYMBOL(ocelot_port_writel);
  61
  62 int ocelot_regfields_init(struct ocelot *ocelot,
  63                           const struct reg_field *const regfields)
  64 {
  65         unsigned int i;
  66         u16 target;
  67
  68         for (i = 0; i < REGFIELD_MAX; i++) {
  69                 struct reg_field regfield = {};
  70                 u32 reg = regfields[i].reg;
  71
  72                 if (!reg)
  73                         continue;
  74
  75                 target = regfields[i].reg >> TARGET_OFFSET;
  76
  77                 regfield.reg = ocelot->map[target][reg & REG_MASK];
  78                 regfield.lsb = regfields[i].lsb;
  79                 regfield.msb = regfields[i].msb;
  80
  81                 ocelot->regfields[i] =
  82                 devm_regmap_field_alloc(ocelot->dev,
  83                                         ocelot->targets[target],
  84                                         regfield);
  85
  86                 if (IS_ERR(ocelot->regfields[i]))
  87                         return PTR_ERR(ocelot->regfields[i]);
  88         }
  89
  90         return 0;
  91 }
  92 EXPORT_SYMBOL(ocelot_regfields_init);
  93
  94 static struct regmap_config ocelot_regmap_config = {
  95         .reg_bits       = 32,
  96         .val_bits       = 32,
  97         .reg_stride     = 4,
  98 };
  99
 100 struct regmap *ocelot_io_platform_init(struct ocelot *ocelot,
 101                                        struct platform_device *pdev,
 102                                        const char *name)
 103 {
 104         struct resource *res;
 105         void __iomem *regs;
 106
 107         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
 108         regs = devm_ioremap_resource(ocelot->dev, res);
 109         if (IS_ERR(regs))
 110                 return ERR_CAST(regs);
 111
 112         ocelot_regmap_config.name = name;
 113         return devm_regmap_init_mmio(ocelot->dev, regs,
 114                                      &ocelot_regmap_config);
 115 }
 116 EXPORT_SYMBOL(ocelot_io_platform_init);