1 /*
2 * OMAP2/3 interface clock control
3 *
4 * Copyright (C) 2011 Nokia Corporation
5 * Paul Walmsley
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #undef DEBUG
12
13 #include <linux/kernel.h>
14 #include <linux/clk-provider.h>
15 #include <linux/io.h>
16 #include <linux/clk/ti.h>
17
18 #include "clock.h"
19
20 /* Register offsets */
21 #define OMAP24XX_CM_FCLKEN2 0x04
22 #define CM_AUTOIDLE 0x30
23 #define CM_ICLKEN 0x10
24 #define CM_IDLEST 0x20
25
26 #define OMAP24XX_CM_IDLEST_VAL 0
27
28 /* Private functions */
29
30 /* XXX */
omap2_clkt_iclk_allow_idle(struct clk_hw_omap * clk)31 void omap2_clkt_iclk_allow_idle(struct clk_hw_omap *clk)
32 {
33 u32 v;
34 struct clk_omap_reg r;
35
36 memcpy(&r, &clk->enable_reg, sizeof(r));
37 r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN);
38
39 v = ti_clk_ll_ops->clk_readl(&r);
40 v |= (1 << clk->enable_bit);
41 ti_clk_ll_ops->clk_writel(v, &r);
42 }
43
44 /* XXX */
omap2_clkt_iclk_deny_idle(struct clk_hw_omap * clk)45 void omap2_clkt_iclk_deny_idle(struct clk_hw_omap *clk)
46 {
47 u32 v;
48 struct clk_omap_reg r;
49
50 memcpy(&r, &clk->enable_reg, sizeof(r));
51
52 r.offset ^= (CM_AUTOIDLE ^ CM_ICLKEN);
53
54 v = ti_clk_ll_ops->clk_readl(&r);
55 v &= ~(1 << clk->enable_bit);
56 ti_clk_ll_ops->clk_writel(v, &r);
57 }
58
59 /**
60 * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
61 * @clk: struct clk * being enabled
62 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
63 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
64 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
65 *
66 * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
67 * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function
68 * passes back the correct CM_IDLEST register address for I2CHS
69 * modules. No return value.
70 */
omap2430_clk_i2chs_find_idlest(struct clk_hw_omap * clk,struct clk_omap_reg * idlest_reg,u8 * idlest_bit,u8 * idlest_val)71 static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk,
72 struct clk_omap_reg *idlest_reg,
73 u8 *idlest_bit,
74 u8 *idlest_val)
75 {
76 memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
77 idlest_reg->offset ^= (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST);
78 *idlest_bit = clk->enable_bit;
79 *idlest_val = OMAP24XX_CM_IDLEST_VAL;
80 }
81
82 /* Public data */
83
84 const struct clk_hw_omap_ops clkhwops_iclk = {
85 .allow_idle = omap2_clkt_iclk_allow_idle,
86 .deny_idle = omap2_clkt_iclk_deny_idle,
87 };
88
89 const struct clk_hw_omap_ops clkhwops_iclk_wait = {
90 .allow_idle = omap2_clkt_iclk_allow_idle,
91 .deny_idle = omap2_clkt_iclk_deny_idle,
92 .find_idlest = omap2_clk_dflt_find_idlest,
93 .find_companion = omap2_clk_dflt_find_companion,
94 };
95
96 /* 2430 I2CHS has non-standard IDLEST register */
97 const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = {
98 .find_idlest = omap2430_clk_i2chs_find_idlest,
99 .find_companion = omap2_clk_dflt_find_companion,
100 };
101