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 void __iomem *r;
35
36 r = (__force void __iomem *)
37 ((__force u32)clk->enable_reg ^ (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 void __iomem *r;
49
50 r = (__force void __iomem *)
51 ((__force u32)clk->enable_reg ^ (CM_AUTOIDLE ^ CM_ICLKEN));
52
53 v = ti_clk_ll_ops->clk_readl(r);
54 v &= ~(1 << clk->enable_bit);
55 ti_clk_ll_ops->clk_writel(v, r);
56 }
57
58 /**
59 * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
60 * @clk: struct clk * being enabled
61 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
62 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
63 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
64 *
65 * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
66 * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function
67 * passes back the correct CM_IDLEST register address for I2CHS
68 * modules. No return value.
69 */
omap2430_clk_i2chs_find_idlest(struct clk_hw_omap * clk,void __iomem ** idlest_reg,u8 * idlest_bit,u8 * idlest_val)70 static void omap2430_clk_i2chs_find_idlest(struct clk_hw_omap *clk,
71 void __iomem **idlest_reg,
72 u8 *idlest_bit,
73 u8 *idlest_val)
74 {
75 u32 r;
76
77 r = ((__force u32)clk->enable_reg ^ (OMAP24XX_CM_FCLKEN2 ^ CM_IDLEST));
78 *idlest_reg = (__force void __iomem *)r;
79 *idlest_bit = clk->enable_bit;
80 *idlest_val = OMAP24XX_CM_IDLEST_VAL;
81 }
82
83 /* Public data */
84
85 const struct clk_hw_omap_ops clkhwops_iclk = {
86 .allow_idle = omap2_clkt_iclk_allow_idle,
87 .deny_idle = omap2_clkt_iclk_deny_idle,
88 };
89
90 const struct clk_hw_omap_ops clkhwops_iclk_wait = {
91 .allow_idle = omap2_clkt_iclk_allow_idle,
92 .deny_idle = omap2_clkt_iclk_deny_idle,
93 .find_idlest = omap2_clk_dflt_find_idlest,
94 .find_companion = omap2_clk_dflt_find_companion,
95 };
96
97 /* 2430 I2CHS has non-standard IDLEST register */
98 const struct clk_hw_omap_ops clkhwops_omap2430_i2chs_wait = {
99 .find_idlest = omap2430_clk_i2chs_find_idlest,
100 .find_companion = omap2_clk_dflt_find_companion,
101 };
102