drivers/clk/qcom/gdsc.h

   1 /*
   2  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   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_GDSC_H__
  15 #define __QCOM_GDSC_H__
  16
  17 #include <linux/err.h>
  18 #include <linux/pm_domain.h>
  19
  20 struct regmap;
  21 struct reset_controller_dev;
  22
  23 /**
  24  * struct gdsc - Globally Distributed Switch Controller
  25  * @pd: generic power domain
  26  * @regmap: regmap for MMIO accesses
  27  * @gdscr: gsdc control register
  28  * @gds_hw_ctrl: gds_hw_ctrl register
  29  * @cxcs: offsets of branch registers to toggle mem/periph bits in
  30  * @cxc_count: number of @cxcs
  31  * @pwrsts: Possible powerdomain power states
  32  * @resets: ids of resets associated with this gdsc
  33  * @reset_count: number of @resets
  34  * @rcdev: reset controller
  35  */
  36 struct gdsc {
  37         struct generic_pm_domain        pd;
  38         struct generic_pm_domain        *parent;
  39         struct regmap                   *regmap;
  40         unsigned int                    gdscr;
  41         unsigned int                    gds_hw_ctrl;
  42         unsigned int                    *cxcs;
  43         unsigned int                    cxc_count;
  44         const u8                        pwrsts;
  45 /* Powerdomain allowable state bitfields */
  46 #define PWRSTS_OFF              BIT(0)
  47 #define PWRSTS_RET              BIT(1)
  48 #define PWRSTS_ON               BIT(2)
  49 #define PWRSTS_OFF_ON           (PWRSTS_OFF | PWRSTS_ON)
  50 #define PWRSTS_RET_ON           (PWRSTS_RET | PWRSTS_ON)
  51         const u8                        flags;
  52 #define VOTABLE         BIT(0)
  53         struct reset_controller_dev     *rcdev;
  54         unsigned int                    *resets;
  55         unsigned int                    reset_count;
  56 };
  57
  58 struct gdsc_desc {
  59         struct device *dev;
  60         struct gdsc **scs;
  61         size_t num;
  62 };
  63
  64 #ifdef CONFIG_QCOM_GDSC
  65 int gdsc_register(struct gdsc_desc *desc, struct reset_controller_dev *,
  66                   struct regmap *);
  67 void gdsc_unregister(struct gdsc_desc *desc);
  68 #else
  69 static inline int gdsc_register(struct gdsc_desc *desc,
  70                                 struct reset_controller_dev *rcdev,
  71                                 struct regmap *r)
  72 {
  73         return -ENOSYS;
  74 }
  75
  76 static inline void gdsc_unregister(struct gdsc_desc *desc) {};
  77 #endif /* CONFIG_QCOM_GDSC */
  78 #endif /* __QCOM_GDSC_H__ */