drivers/clk/qcom/clk-branch.h

   1 /*
   2  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #ifndef __QCOM_CLK_BRANCH_H__
  15 #define __QCOM_CLK_BRANCH_H__
  16
  17 #include <linux/clk-provider.h>
  18
  19 #include "clk-regmap.h"
  20
  21 /**
  22  * struct clk_branch - gating clock with status bit and dynamic hardware gating
  23  *
  24  * @hwcg_reg: dynamic hardware clock gating register
  25  * @hwcg_bit: ORed with @hwcg_reg to enable dynamic hardware clock gating
  26  * @halt_reg: halt register
  27  * @halt_bit: ANDed with @halt_reg to test for clock halted
  28  * @halt_check: type of halt checking to perform
  29  * @clkr: handle between common and hardware-specific interfaces
  30  *
  31  * Clock which can gate its output.
  32  */
  33 struct clk_branch {
  34         u32     hwcg_reg;
  35         u32     halt_reg;
  36         u8      hwcg_bit;
  37         u8      halt_bit;
  38         u8      halt_check;
  39 #define BRANCH_VOTED                    BIT(7) /* Delay on disable */
  40 #define BRANCH_HALT                     0 /* pol: 1 = halt */
  41 #define BRANCH_HALT_VOTED               (BRANCH_HALT | BRANCH_VOTED)
  42 #define BRANCH_HALT_ENABLE              1 /* pol: 0 = halt */
  43 #define BRANCH_HALT_ENABLE_VOTED        (BRANCH_HALT_ENABLE | BRANCH_VOTED)
  44 #define BRANCH_HALT_DELAY               2 /* No bit to check; just delay */
  45 #define BRANCH_HALT_SKIP                3 /* Don't check halt bit */
  46
  47         struct clk_regmap clkr;
  48 };
  49
  50 extern const struct clk_ops clk_branch_ops;
  51 extern const struct clk_ops clk_branch2_ops;
  52 extern const struct clk_ops clk_branch_simple_ops;
  53
  54 #define to_clk_branch(_hw) \
  55         container_of(to_clk_regmap(_hw), struct clk_branch, clkr)
  56
  57 #endif