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 */
28void 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 */
42void 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 */
68static 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
81const 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
86const 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 */
94const 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};
98

source code of linux/drivers/clk/ti/clkt_iclk.c