drivers/clk/meson/gxbb-aoclk.c

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright (c) 2016 BayLibre, SAS.
   8  * Author: Neil Armstrong <narmstrong@baylibre.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called COPYING.
  23  *
  24  * BSD LICENSE
  25  *
  26  * Copyright (c) 2016 BayLibre, SAS.
  27  * Author: Neil Armstrong <narmstrong@baylibre.com>
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  *
  33  *   * Redistributions of source code must retain the above copyright
  34  *     notice, this list of conditions and the following disclaimer.
  35  *   * Redistributions in binary form must reproduce the above copyright
  36  *     notice, this list of conditions and the following disclaimer in
  37  *     the documentation and/or other materials provided with the
  38  *     distribution.
  39  *   * Neither the name of Intel Corporation nor the names of its
  40  *     contributors may be used to endorse or promote products derived
  41  *     from this software without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55 #include <linux/clk-provider.h>
  56 #include <linux/of_address.h>
  57 #include <linux/platform_device.h>
  58 #include <linux/reset-controller.h>
  59 #include <linux/mfd/syscon.h>
  60 #include <linux/regmap.h>
  61 #include <linux/init.h>
  62 #include <linux/delay.h>
  63 #include <dt-bindings/clock/gxbb-aoclkc.h>
  64 #include <dt-bindings/reset/gxbb-aoclkc.h>
  65 #include "gxbb-aoclk.h"
  66
  67 static DEFINE_SPINLOCK(gxbb_aoclk_lock);
  68
  69 struct gxbb_aoclk_reset_controller {
  70         struct reset_controller_dev reset;
  71         unsigned int *data;
  72         struct regmap *regmap;
  73 };
  74
  75 static int gxbb_aoclk_do_reset(struct reset_controller_dev *rcdev,
  76                                unsigned long id)
  77 {
  78         struct gxbb_aoclk_reset_controller *reset =
  79                 container_of(rcdev, struct gxbb_aoclk_reset_controller, reset);
  80
  81         return regmap_write(reset->regmap, AO_RTI_GEN_CNTL_REG0,
  82                             BIT(reset->data[id]));
  83 }
  84
  85 static const struct reset_control_ops gxbb_aoclk_reset_ops = {
  86         .reset = gxbb_aoclk_do_reset,
  87 };
  88
  89 #define GXBB_AO_GATE(_name, _bit)                                       \
  90 static struct aoclk_gate_regmap _name##_ao = {                          \
  91         .bit_idx = (_bit),                                              \
  92         .lock = &gxbb_aoclk_lock,                                       \
  93         .hw.init = &(struct clk_init_data) {                            \
  94                 .name = #_name "_ao",                                   \
  95                 .ops = &meson_aoclk_gate_regmap_ops,                    \
  96                 .parent_names = (const char *[]){ "clk81" },            \
  97                 .num_parents = 1,                                       \
  98                 .flags = (CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED),     \
  99         },                                                              \
 100 }
 101
 102 GXBB_AO_GATE(remote, 0);
 103 GXBB_AO_GATE(i2c_master, 1);
 104 GXBB_AO_GATE(i2c_slave, 2);
 105 GXBB_AO_GATE(uart1, 3);
 106 GXBB_AO_GATE(uart2, 5);
 107 GXBB_AO_GATE(ir_blaster, 6);
 108
 109 static struct aoclk_cec_32k cec_32k_ao = {
 110         .lock = &gxbb_aoclk_lock,
 111         .hw.init = &(struct clk_init_data) {
 112                 .name = "cec_32k_ao",
 113                 .ops = &meson_aoclk_cec_32k_ops,
 114                 .parent_names = (const char *[]){ "xtal" },
 115                 .num_parents = 1,
 116                 .flags = CLK_IGNORE_UNUSED,
 117         },
 118 };
 119
 120 static unsigned int gxbb_aoclk_reset[] = {
 121         [RESET_AO_REMOTE] = 16,
 122         [RESET_AO_I2C_MASTER] = 18,
 123         [RESET_AO_I2C_SLAVE] = 19,
 124         [RESET_AO_UART1] = 17,
 125         [RESET_AO_UART2] = 22,
 126         [RESET_AO_IR_BLASTER] = 23,
 127 };
 128
 129 static struct aoclk_gate_regmap *gxbb_aoclk_gate[] = {
 130         [CLKID_AO_REMOTE] = &remote_ao,
 131         [CLKID_AO_I2C_MASTER] = &i2c_master_ao,
 132         [CLKID_AO_I2C_SLAVE] = &i2c_slave_ao,
 133         [CLKID_AO_UART1] = &uart1_ao,
 134         [CLKID_AO_UART2] = &uart2_ao,
 135         [CLKID_AO_IR_BLASTER] = &ir_blaster_ao,
 136 };
 137
 138 static struct clk_hw_onecell_data gxbb_aoclk_onecell_data = {
 139         .hws = {
 140                 [CLKID_AO_REMOTE] = &remote_ao.hw,
 141                 [CLKID_AO_I2C_MASTER] = &i2c_master_ao.hw,
 142                 [CLKID_AO_I2C_SLAVE] = &i2c_slave_ao.hw,
 143                 [CLKID_AO_UART1] = &uart1_ao.hw,
 144                 [CLKID_AO_UART2] = &uart2_ao.hw,
 145                 [CLKID_AO_IR_BLASTER] = &ir_blaster_ao.hw,
 146                 [CLKID_AO_CEC_32K] = &cec_32k_ao.hw,
 147         },
 148         .num = 7,
 149 };
 150
 151 static int gxbb_aoclkc_probe(struct platform_device *pdev)
 152 {
 153         struct gxbb_aoclk_reset_controller *rstc;
 154         struct device *dev = &pdev->dev;
 155         struct regmap *regmap;
 156         int ret, clkid;
 157
 158         rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
 159         if (!rstc)
 160                 return -ENOMEM;
 161
 162         regmap = syscon_node_to_regmap(of_get_parent(dev->of_node));
 163         if (IS_ERR(regmap)) {
 164                 dev_err(dev, "failed to get regmap\n");
 165                 return -ENODEV;
 166         }
 167
 168         /* Reset Controller */
 169         rstc->regmap = regmap;
 170         rstc->data = gxbb_aoclk_reset;
 171         rstc->reset.ops = &gxbb_aoclk_reset_ops;
 172         rstc->reset.nr_resets = ARRAY_SIZE(gxbb_aoclk_reset);
 173         rstc->reset.of_node = dev->of_node;
 174         ret = devm_reset_controller_register(dev, &rstc->reset);
 175
 176         /*
 177          * Populate regmap and register all clks
 178          */
 179         for (clkid = 0; clkid < ARRAY_SIZE(gxbb_aoclk_gate); clkid++) {
 180                 gxbb_aoclk_gate[clkid]->regmap = regmap;
 181
 182                 ret = devm_clk_hw_register(dev,
 183                                         gxbb_aoclk_onecell_data.hws[clkid]);
 184                 if (ret)
 185                         return ret;
 186         }
 187
 188         /* Specific clocks */
 189         cec_32k_ao.regmap = regmap;
 190         ret = devm_clk_hw_register(dev, &cec_32k_ao.hw);
 191         if (ret)
 192                 return ret;
 193
 194         return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
 195                         &gxbb_aoclk_onecell_data);
 196 }
 197
 198 static const struct of_device_id gxbb_aoclkc_match_table[] = {
 199         { .compatible = "amlogic,meson-gx-aoclkc" },
 200         { }
 201 };
 202
 203 static struct platform_driver gxbb_aoclkc_driver = {
 204         .probe          = gxbb_aoclkc_probe,
 205         .driver         = {
 206                 .name   = "gxbb-aoclkc",
 207                 .of_match_table = gxbb_aoclkc_match_table,
 208         },
 209 };
 210 builtin_platform_driver(gxbb_aoclkc_driver);