1/*
2 * OMAP3-specific clock framework functions
3 *
4 * Copyright (C) 2007-2008 Texas Instruments, Inc.
5 * Copyright (C) 2007-2011 Nokia Corporation
6 *
7 * Paul Walmsley
8 * Jouni Högander
9 *
10 * Parts of this code are based on code written by
11 * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu,
12 * Russell King
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18#undef DEBUG
19
20#include <linux/kernel.h>
21#include <linux/clk.h>
22#include <linux/io.h>
23
24#include "clock.h"
25#include "clock34xx.h"
26#include "cm3xxx.h"
27#include "cm-regbits-34xx.h"
28
29/**
30 * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
31 * @clk: struct clk * being enabled
32 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
33 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
34 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
35 *
36 * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
37 * from the CM_{I,F}CLKEN bit.  Pass back the correct info via
38 * @idlest_reg and @idlest_bit.  No return value.
39 */
40static void omap3430es2_clk_ssi_find_idlest(struct clk_hw_omap *clk,
41					    void __iomem **idlest_reg,
42					    u8 *idlest_bit,
43					    u8 *idlest_val)
44{
45	u32 r;
46
47	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
48	*idlest_reg = (__force void __iomem *)r;
49	*idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
50	*idlest_val = OMAP34XX_CM_IDLEST_VAL;
51}
52const struct clk_hw_omap_ops clkhwops_omap3430es2_ssi_wait = {
53	.find_idlest	= omap3430es2_clk_ssi_find_idlest,
54	.find_companion	= omap2_clk_dflt_find_companion,
55};
56
57const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_ssi_wait = {
58	.allow_idle	= omap2_clkt_iclk_allow_idle,
59	.deny_idle	= omap2_clkt_iclk_deny_idle,
60	.find_idlest	= omap3430es2_clk_ssi_find_idlest,
61	.find_companion = omap2_clk_dflt_find_companion,
62};
63
64/**
65 * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
66 * @clk: struct clk * being enabled
67 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
68 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
69 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
70 *
71 * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
72 * target IDLEST bits.  For our purposes, we are concerned with the
73 * target IDLEST bits, which exist at a different bit position than
74 * the *CLKEN bit position for these modules (DSS and USBHOST) (The
75 * default find_idlest code assumes that they are at the same
76 * position.)  No return value.
77 */
78static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk_hw_omap *clk,
79						    void __iomem **idlest_reg,
80						    u8 *idlest_bit,
81						    u8 *idlest_val)
82{
83	u32 r;
84
85	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
86	*idlest_reg = (__force void __iomem *)r;
87	/* USBHOST_IDLE has same shift */
88	*idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
89	*idlest_val = OMAP34XX_CM_IDLEST_VAL;
90}
91
92const struct clk_hw_omap_ops clkhwops_omap3430es2_dss_usbhost_wait = {
93	.find_idlest	= omap3430es2_clk_dss_usbhost_find_idlest,
94	.find_companion	= omap2_clk_dflt_find_companion,
95};
96
97const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_dss_usbhost_wait = {
98	.allow_idle	= omap2_clkt_iclk_allow_idle,
99	.deny_idle	= omap2_clkt_iclk_deny_idle,
100	.find_idlest	= omap3430es2_clk_dss_usbhost_find_idlest,
101	.find_companion	= omap2_clk_dflt_find_companion,
102};
103
104/**
105 * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
106 * @clk: struct clk * being enabled
107 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
108 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
109 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
110 *
111 * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
112 * shift from the CM_{I,F}CLKEN bit.  Pass back the correct info via
113 * @idlest_reg and @idlest_bit.  No return value.
114 */
115static void omap3430es2_clk_hsotgusb_find_idlest(struct clk_hw_omap *clk,
116						 void __iomem **idlest_reg,
117						 u8 *idlest_bit,
118						 u8 *idlest_val)
119{
120	u32 r;
121
122	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
123	*idlest_reg = (__force void __iomem *)r;
124	*idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
125	*idlest_val = OMAP34XX_CM_IDLEST_VAL;
126}
127
128const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_hsotgusb_wait = {
129	.allow_idle	= omap2_clkt_iclk_allow_idle,
130	.deny_idle	= omap2_clkt_iclk_deny_idle,
131	.find_idlest	= omap3430es2_clk_hsotgusb_find_idlest,
132	.find_companion	= omap2_clk_dflt_find_companion,
133};
134
135const struct clk_hw_omap_ops clkhwops_omap3430es2_hsotgusb_wait = {
136	.find_idlest	= omap3430es2_clk_hsotgusb_find_idlest,
137	.find_companion	= omap2_clk_dflt_find_companion,
138};
139