drivers/clk/hisilicon/clk-hi3519.c

   1 /*
   2  * Hi3519 Clock Driver
   3  *
   4  * Copyright (c) 2015-2016 HiSilicon Technologies Co., Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <dt-bindings/clock/hi3519-clock.h>
  21 #include <linux/clk-provider.h>
  22 #include <linux/module.h>
  23 #include <linux/platform_device.h>
  24 #include "clk.h"
  25 #include "reset.h"
  26
  27 #define HI3519_INNER_CLK_OFFSET 64
  28 #define HI3519_FIXED_24M        65
  29 #define HI3519_FIXED_50M        66
  30 #define HI3519_FIXED_75M        67
  31 #define HI3519_FIXED_125M       68
  32 #define HI3519_FIXED_150M       69
  33 #define HI3519_FIXED_200M       70
  34 #define HI3519_FIXED_250M       71
  35 #define HI3519_FIXED_300M       72
  36 #define HI3519_FIXED_400M       73
  37 #define HI3519_FMC_MUX          74
  38
  39 #define HI3519_NR_CLKS          128
  40
  41 struct hi3519_crg_data {
  42         struct hisi_clock_data *clk_data;
  43         struct hisi_reset_controller *rstc;
  44 };
  45
  46 static const struct hisi_fixed_rate_clock hi3519_fixed_rate_clks[] = {
  47         { HI3519_FIXED_24M, "24m", NULL, 0, 24000000, },
  48         { HI3519_FIXED_50M, "50m", NULL, 0, 50000000, },
  49         { HI3519_FIXED_75M, "75m", NULL, 0, 75000000, },
  50         { HI3519_FIXED_125M, "125m", NULL, 0, 125000000, },
  51         { HI3519_FIXED_150M, "150m", NULL, 0, 150000000, },
  52         { HI3519_FIXED_200M, "200m", NULL, 0, 200000000, },
  53         { HI3519_FIXED_250M, "250m", NULL, 0, 250000000, },
  54         { HI3519_FIXED_300M, "300m", NULL, 0, 300000000, },
  55         { HI3519_FIXED_400M, "400m", NULL, 0, 400000000, },
  56 };
  57
  58 static const char *const fmc_mux_p[] = {
  59                 "24m", "75m", "125m", "150m", "200m", "250m", "300m", "400m", };
  60 static u32 fmc_mux_table[] = {0, 1, 2, 3, 4, 5, 6, 7};
  61
  62 static const struct hisi_mux_clock hi3519_mux_clks[] = {
  63         { HI3519_FMC_MUX, "fmc_mux", fmc_mux_p, ARRAY_SIZE(fmc_mux_p),
  64                 CLK_SET_RATE_PARENT, 0xc0, 2, 3, 0, fmc_mux_table, },
  65 };
  66
  67 static const struct hisi_gate_clock hi3519_gate_clks[] = {
  68         { HI3519_FMC_CLK, "clk_fmc", "fmc_mux",
  69                 CLK_SET_RATE_PARENT, 0xc0, 1, 0, },
  70         { HI3519_UART0_CLK, "clk_uart0", "24m",
  71                 CLK_SET_RATE_PARENT, 0xe4, 20, 0, },
  72         { HI3519_UART1_CLK, "clk_uart1", "24m",
  73                 CLK_SET_RATE_PARENT, 0xe4, 21, 0, },
  74         { HI3519_UART2_CLK, "clk_uart2", "24m",
  75                 CLK_SET_RATE_PARENT, 0xe4, 22, 0, },
  76         { HI3519_UART3_CLK, "clk_uart3", "24m",
  77                 CLK_SET_RATE_PARENT, 0xe4, 23, 0, },
  78         { HI3519_UART4_CLK, "clk_uart4", "24m",
  79                 CLK_SET_RATE_PARENT, 0xe4, 24, 0, },
  80         { HI3519_SPI0_CLK, "clk_spi0", "50m",
  81                 CLK_SET_RATE_PARENT, 0xe4, 16, 0, },
  82         { HI3519_SPI1_CLK, "clk_spi1", "50m",
  83                 CLK_SET_RATE_PARENT, 0xe4, 17, 0, },
  84         { HI3519_SPI2_CLK, "clk_spi2", "50m",
  85                 CLK_SET_RATE_PARENT, 0xe4, 18, 0, },
  86 };
  87
  88 static struct hisi_clock_data *hi3519_clk_register(struct platform_device *pdev)
  89 {
  90         struct hisi_clock_data *clk_data;
  91         int ret;
  92
  93         clk_data = hisi_clk_alloc(pdev, HI3519_NR_CLKS);
  94         if (!clk_data)
  95                 return ERR_PTR(-ENOMEM);
  96
  97         ret = hisi_clk_register_fixed_rate(hi3519_fixed_rate_clks,
  98                                      ARRAY_SIZE(hi3519_fixed_rate_clks),
  99                                      clk_data);
 100         if (ret)
 101                 return ERR_PTR(ret);
 102
 103         ret = hisi_clk_register_mux(hi3519_mux_clks,
 104                                 ARRAY_SIZE(hi3519_mux_clks),
 105                                 clk_data);
 106         if (ret)
 107                 goto unregister_fixed_rate;
 108
 109         ret = hisi_clk_register_gate(hi3519_gate_clks,
 110                                 ARRAY_SIZE(hi3519_gate_clks),
 111                                 clk_data);
 112         if (ret)
 113                 goto unregister_mux;
 114
 115         ret = of_clk_add_provider(pdev->dev.of_node,
 116                         of_clk_src_onecell_get, &clk_data->clk_data);
 117         if (ret)
 118                 goto unregister_gate;
 119
 120         return clk_data;
 121
 122 unregister_fixed_rate:
 123         hisi_clk_unregister_fixed_rate(hi3519_fixed_rate_clks,
 124                                 ARRAY_SIZE(hi3519_fixed_rate_clks),
 125                                 clk_data);
 126
 127 unregister_mux:
 128         hisi_clk_unregister_mux(hi3519_mux_clks,
 129                                 ARRAY_SIZE(hi3519_mux_clks),
 130                                 clk_data);
 131 unregister_gate:
 132         hisi_clk_unregister_gate(hi3519_gate_clks,
 133                                 ARRAY_SIZE(hi3519_gate_clks),
 134                                 clk_data);
 135         return ERR_PTR(ret);
 136 }
 137
 138 static void hi3519_clk_unregister(struct platform_device *pdev)
 139 {
 140         struct hi3519_crg_data *crg = platform_get_drvdata(pdev);
 141
 142         of_clk_del_provider(pdev->dev.of_node);
 143
 144         hisi_clk_unregister_gate(hi3519_gate_clks,
 145                                 ARRAY_SIZE(hi3519_mux_clks),
 146                                 crg->clk_data);
 147         hisi_clk_unregister_mux(hi3519_mux_clks,
 148                                 ARRAY_SIZE(hi3519_mux_clks),
 149                                 crg->clk_data);
 150         hisi_clk_unregister_fixed_rate(hi3519_fixed_rate_clks,
 151                                 ARRAY_SIZE(hi3519_fixed_rate_clks),
 152                                 crg->clk_data);
 153 }
 154
 155 static int hi3519_clk_probe(struct platform_device *pdev)
 156 {
 157         struct hi3519_crg_data *crg;
 158
 159         crg = devm_kmalloc(&pdev->dev, sizeof(*crg), GFP_KERNEL);
 160         if (!crg)
 161                 return -ENOMEM;
 162
 163         crg->rstc = hisi_reset_init(pdev);
 164         if (!crg->rstc)
 165                 return -ENOMEM;
 166
 167         crg->clk_data = hi3519_clk_register(pdev);
 168         if (IS_ERR(crg->clk_data)) {
 169                 hisi_reset_exit(crg->rstc);
 170                 return PTR_ERR(crg->clk_data);
 171         }
 172
 173         platform_set_drvdata(pdev, crg);
 174         return 0;
 175 }
 176
 177 static int hi3519_clk_remove(struct platform_device *pdev)
 178 {
 179         struct hi3519_crg_data *crg = platform_get_drvdata(pdev);
 180
 181         hisi_reset_exit(crg->rstc);
 182         hi3519_clk_unregister(pdev);
 183         return 0;
 184 }
 185
 186
 187 static const struct of_device_id hi3519_clk_match_table[] = {
 188         { .compatible = "hisilicon,hi3519-crg" },
 189         { }
 190 };
 191 MODULE_DEVICE_TABLE(of, hi3519_clk_match_table);
 192
 193 static struct platform_driver hi3519_clk_driver = {
 194         .probe          = hi3519_clk_probe,
 195         .remove         = hi3519_clk_remove,
 196         .driver         = {
 197                 .name   = "hi3519-clk",
 198                 .of_match_table = hi3519_clk_match_table,
 199         },
 200 };
 201
 202 static int __init hi3519_clk_init(void)
 203 {
 204         return platform_driver_register(&hi3519_clk_driver);
 205 }
 206 core_initcall(hi3519_clk_init);
 207
 208 static void __exit hi3519_clk_exit(void)
 209 {
 210         platform_driver_unregister(&hi3519_clk_driver);
 211 }
 212 module_exit(hi3519_clk_exit);
 213
 214 MODULE_LICENSE("GPL v2");
 215 MODULE_DESCRIPTION("HiSilicon Hi3519 Clock Driver");