drivers/clk/ti/clkt_iclk.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * OMAP2/3 interface clock control
   4  *
   5  * Copyright (C) 2011 Nokia Corporation
   6  * Paul Walmsley
   7  */
   8 #undef DEBUG
   9
  10 #include <linux/kernel.h>
  11 #include <linux/clk-provider.h>
  12 #include <linux/io.h>
  13 #include <linux/clk/ti.h>
  14
  15 #include "clock.h"
  16
  17 /* Register offsets */
  18 #define OMAP24XX_CM_FCLKEN2             0x04
  19 #define CM_AUTOIDLE                     0x30
  20 #define CM_ICLKEN                       0x10
  21 #define CM_IDLEST                       0x20
  22
  23 #define OMAP24XX_CM_IDLEST_VAL          0
  24
  25 /* Private functions */
  26
  27 /* XXX */
  28 void omap2_clkt_iclk_allow_idle(struct clk_hw_omap *clk)
  29 {
  30         u32 v;
  31         struct clk_omap_reg r;
  32
  33         memcpy(&r, &clk->enable_reg, sizeof(r));
  34         r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN);
  35
  36         v = ti_clk_ll_ops->clk_readl(&r);
  37         v |= (1 << clk->enable_bit);
  38         ti_clk_ll_ops->clk_writel(v, &r);
  39 }
  40
  41 /* XXX */
  42 void omap2_clkt_iclk_deny_idle(struct clk_hw_omap *clk)
  43 {
  44         u32 v;
  45         struct clk_omap_reg r;
  46
  47         memcpy(&r, &clk->enable_reg, sizeof(r));
  48
  49         r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN);
  50
  51         v = ti_clk_ll_ops->clk_readl(&r);
  52         v &= ~(1 << clk->enable_bit);
  53         ti_clk_ll_ops->clk_writel(v, &r);
  54 }
  55
  56 /**
  57  * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
  58  * @clk: struct clk * being enabled
  59  * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
  60  * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
  61  * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
  62  *
  63  * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
  64  * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE.  This custom function
  65  * passes back the correct CM_IDLEST register address for I2CHS
  66  * modules.  No return value.
  67  */
  68 static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk,
  69                                            struct clk_omap_reg *idlest_reg,
  70                                            u8 *idlest_bit,
  71                                            u8 *idlest_val)
  72 {
  73         memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
  74         idlest_reg->offset ^= (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST);
  75         *idlest_bit = clk->enable_bit;
  76         *idlest_val = OMAP24XX_CM_IDLEST_VAL;
  77 }
  78
  79 /* Public data */
  80
  81 const struct clk_hw_omap_ops clkhwops_iclk = {
  82         .allow_idle     = omap2_clkt_iclk_allow_idle,
  83         .deny_idle      = omap2_clkt_iclk_deny_idle,
  84 };
  85
  86 const struct clk_hw_omap_ops clkhwops_iclk_wait = {
  87         .allow_idle     = omap2_clkt_iclk_allow_idle,
  88         .deny_idle      = omap2_clkt_iclk_deny_idle,
  89         .find_idlest    = omap2_clk_dflt_find_idlest,
  90         .find_companion = omap2_clk_dflt_find_companion,
  91 };
  92
  93 /* 2430 I2CHS has non-standard IDLEST register */
  94 const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = {
  95         .find_idlest    = omap2430_clk_i2chs_find_idlest,
  96         .find_companion = omap2_clk_dflt_find_companion,
  97 };