drivers/clk/socfpga/clk-gate-s10.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2017, Intel Corporation
   4  */
   5 #include <linux/clk-provider.h>
   6 #include <linux/io.h>
   7 #include <linux/slab.h>
   8 #include "stratix10-clk.h"
   9 #include "clk.h"
  10
  11 #define SOCFPGA_CS_PDBG_CLK     "cs_pdbg_clk"
  12 #define to_socfpga_gate_clk(p) container_of(p, struct socfpga_gate_clk, hw.hw)
  13
  14 #define SOCFPGA_EMAC0_CLK               "emac0_clk"
  15 #define SOCFPGA_EMAC1_CLK               "emac1_clk"
  16 #define SOCFPGA_EMAC2_CLK               "emac2_clk"
  17 #define AGILEX_BYPASS_OFFSET            0xC
  18 #define STRATIX10_BYPASS_OFFSET         0x2C
  19 #define BOOTCLK_BYPASS                  2
  20
  21 static unsigned long socfpga_gate_clk_recalc_rate(struct clk_hw *hwclk,
  22                                                   unsigned long parent_rate)
  23 {
  24         struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
  25         u32 div = 1, val;
  26
  27         if (socfpgaclk->fixed_div) {
  28                 div = socfpgaclk->fixed_div;
  29         } else if (socfpgaclk->div_reg) {
  30                 val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
  31                 val &= GENMASK(socfpgaclk->width - 1, 0);
  32                 div = (1 << val);
  33         }
  34         return parent_rate / div;
  35 }
  36
  37 static unsigned long socfpga_dbg_clk_recalc_rate(struct clk_hw *hwclk,
  38                                                   unsigned long parent_rate)
  39 {
  40         struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
  41         u32 div, val;
  42
  43         val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
  44         val &= GENMASK(socfpgaclk->width - 1, 0);
  45         div = (1 << val);
  46         div = div ? 4 : 1;
  47
  48         return parent_rate / div;
  49 }
  50
  51 static u8 socfpga_gate_get_parent(struct clk_hw *hwclk)
  52 {
  53         struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
  54         u32 mask, second_bypass;
  55         u8 parent = 0;
  56         const char *name = clk_hw_get_name(hwclk);
  57
  58         if (socfpgaclk->bypass_reg) {
  59                 mask = (0x1 << socfpgaclk->bypass_shift);
  60                 parent = ((readl(socfpgaclk->bypass_reg) & mask) >>
  61                           socfpgaclk->bypass_shift);
  62         }
  63
  64         if (streq(name, SOCFPGA_EMAC0_CLK) ||
  65             streq(name, SOCFPGA_EMAC1_CLK) ||
  66             streq(name, SOCFPGA_EMAC2_CLK)) {
  67                 second_bypass = readl(socfpgaclk->bypass_reg -
  68                                       STRATIX10_BYPASS_OFFSET);
  69                 /* EMACA bypass to bootclk @0xB0 offset */
  70                 if (second_bypass & 0x1)
  71                         if (parent == 0) /* only applicable if parent is maca */
  72                                 parent = BOOTCLK_BYPASS;
  73
  74                 if (second_bypass & 0x2)
  75                         if (parent == 1) /* only applicable if parent is macb */
  76                                 parent = BOOTCLK_BYPASS;
  77         }
  78         return parent;
  79 }
  80
  81 static u8 socfpga_agilex_gate_get_parent(struct clk_hw *hwclk)
  82 {
  83         struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
  84         u32 mask, second_bypass;
  85         u8 parent = 0;
  86         const char *name = clk_hw_get_name(hwclk);
  87
  88         if (socfpgaclk->bypass_reg) {
  89                 mask = (0x1 << socfpgaclk->bypass_shift);
  90                 parent = ((readl(socfpgaclk->bypass_reg) & mask) >>
  91                           socfpgaclk->bypass_shift);
  92         }
  93
  94         if (streq(name, SOCFPGA_EMAC0_CLK) ||
  95             streq(name, SOCFPGA_EMAC1_CLK) ||
  96             streq(name, SOCFPGA_EMAC2_CLK)) {
  97                 second_bypass = readl(socfpgaclk->bypass_reg -
  98                                       AGILEX_BYPASS_OFFSET);
  99                 /* EMACA bypass to bootclk @0x88 offset */
 100                 if (second_bypass & 0x1)
 101                         if (parent == 0) /* only applicable if parent is maca */
 102                                 parent = BOOTCLK_BYPASS;
 103
 104                 if (second_bypass & 0x2)
 105                         if (parent == 1) /* only applicable if parent is macb */
 106                                 parent = BOOTCLK_BYPASS;
 107         }
 108
 109         return parent;
 110 }
 111
 112 static struct clk_ops gateclk_ops = {
 113         .recalc_rate = socfpga_gate_clk_recalc_rate,
 114         .get_parent = socfpga_gate_get_parent,
 115 };
 116
 117 static const struct clk_ops agilex_gateclk_ops = {
 118         .recalc_rate = socfpga_gate_clk_recalc_rate,
 119         .get_parent = socfpga_agilex_gate_get_parent,
 120 };
 121
 122 static const struct clk_ops dbgclk_ops = {
 123         .recalc_rate = socfpga_dbg_clk_recalc_rate,
 124         .get_parent = socfpga_gate_get_parent,
 125 };
 126
 127 struct clk_hw *s10_register_gate(const struct stratix10_gate_clock *clks, void __iomem *regbase)
 128 {
 129         struct clk_hw *hw_clk;
 130         struct socfpga_gate_clk *socfpga_clk;
 131         struct clk_init_data init;
 132         const char *parent_name = clks->parent_name;
 133         int ret;
 134
 135         socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);
 136         if (!socfpga_clk)
 137                 return NULL;
 138
 139         socfpga_clk->hw.reg = regbase + clks->gate_reg;
 140         socfpga_clk->hw.bit_idx = clks->gate_idx;
 141
 142         gateclk_ops.enable = clk_gate_ops.enable;
 143         gateclk_ops.disable = clk_gate_ops.disable;
 144
 145         socfpga_clk->fixed_div = clks->fixed_div;
 146
 147         if (clks->div_reg)
 148                 socfpga_clk->div_reg = regbase + clks->div_reg;
 149         else
 150                 socfpga_clk->div_reg = NULL;
 151
 152         socfpga_clk->width = clks->div_width;
 153         socfpga_clk->shift = clks->div_offset;
 154
 155         if (clks->bypass_reg)
 156                 socfpga_clk->bypass_reg = regbase + clks->bypass_reg;
 157         else
 158                 socfpga_clk->bypass_reg = NULL;
 159         socfpga_clk->bypass_shift = clks->bypass_shift;
 160
 161         if (streq(clks->name, "cs_pdbg_clk"))
 162                 init.ops = &dbgclk_ops;
 163         else
 164                 init.ops = &gateclk_ops;
 165
 166         init.name = clks->name;
 167         init.flags = clks->flags;
 168
 169         init.num_parents = clks->num_parents;
 170         init.parent_names = parent_name ? &parent_name : NULL;
 171         if (init.parent_names == NULL)
 172                 init.parent_data = clks->parent_data;
 173         socfpga_clk->hw.hw.init = &init;
 174
 175         hw_clk = &socfpga_clk->hw.hw;
 176
 177         ret = clk_hw_register(NULL, &socfpga_clk->hw.hw);
 178         if (ret) {
 179                 kfree(socfpga_clk);
 180                 return ERR_PTR(ret);
 181         }
 182         return hw_clk;
 183 }
 184
 185 struct clk_hw *agilex_register_gate(const struct stratix10_gate_clock *clks, void __iomem *regbase)
 186 {
 187         struct clk_hw *hw_clk;
 188         struct socfpga_gate_clk *socfpga_clk;
 189         struct clk_init_data init;
 190         const char *parent_name = clks->parent_name;
 191         int ret;
 192
 193         socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);
 194         if (!socfpga_clk)
 195                 return NULL;
 196
 197         socfpga_clk->hw.reg = regbase + clks->gate_reg;
 198         socfpga_clk->hw.bit_idx = clks->gate_idx;
 199
 200         gateclk_ops.enable = clk_gate_ops.enable;
 201         gateclk_ops.disable = clk_gate_ops.disable;
 202
 203         socfpga_clk->fixed_div = clks->fixed_div;
 204
 205         if (clks->div_reg)
 206                 socfpga_clk->div_reg = regbase + clks->div_reg;
 207         else
 208                 socfpga_clk->div_reg = NULL;
 209
 210         socfpga_clk->width = clks->div_width;
 211         socfpga_clk->shift = clks->div_offset;
 212
 213         if (clks->bypass_reg)
 214                 socfpga_clk->bypass_reg = regbase + clks->bypass_reg;
 215         else
 216                 socfpga_clk->bypass_reg = NULL;
 217         socfpga_clk->bypass_shift = clks->bypass_shift;
 218
 219         if (streq(clks->name, "cs_pdbg_clk"))
 220                 init.ops = &dbgclk_ops;
 221         else
 222                 init.ops = &agilex_gateclk_ops;
 223
 224         init.name = clks->name;
 225         init.flags = clks->flags;
 226
 227         init.num_parents = clks->num_parents;
 228         init.parent_names = parent_name ? &parent_name : NULL;
 229         if (init.parent_names == NULL)
 230                 init.parent_data = clks->parent_data;
 231         socfpga_clk->hw.hw.init = &init;
 232
 233         hw_clk = &socfpga_clk->hw.hw;
 234
 235         ret = clk_hw_register(NULL, &socfpga_clk->hw.hw);
 236         if (ret) {
 237                 kfree(socfpga_clk);
 238                 return ERR_PTR(ret);
 239         }
 240         return hw_clk;
 241 }