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 <plat/clock.h>
25
26 #include "clock.h"
27 #include "clock34xx.h"
28 #include "cm2xxx_3xxx.h"
29 #include "cm-regbits-34xx.h"
30
31 /**
32 * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
33 * @clk: struct clk * being enabled
34 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
35 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
36 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
37 *
38 * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
39 * from the CM_{I,F}CLKEN bit. Pass back the correct info via
40 * @idlest_reg and @idlest_bit. No return value.
41 */
omap3430es2_clk_ssi_find_idlest(struct clk * clk,void __iomem ** idlest_reg,u8 * idlest_bit,u8 * idlest_val)42 static void omap3430es2_clk_ssi_find_idlest(struct clk *clk,
43 void __iomem **idlest_reg,
44 u8 *idlest_bit,
45 u8 *idlest_val)
46 {
47 u32 r;
48
49 r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
50 *idlest_reg = (__force void __iomem *)r;
51 *idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
52 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
53 }
54
55 const struct clkops clkops_omap3430es2_ssi_wait = {
56 .enable = omap2_dflt_clk_enable,
57 .disable = omap2_dflt_clk_disable,
58 .find_idlest = omap3430es2_clk_ssi_find_idlest,
59 .find_companion = omap2_clk_dflt_find_companion,
60 };
61
62 const struct clkops clkops_omap3430es2_iclk_ssi_wait = {
63 .enable = omap2_dflt_clk_enable,
64 .disable = omap2_dflt_clk_disable,
65 .find_idlest = omap3430es2_clk_ssi_find_idlest,
66 .find_companion = omap2_clk_dflt_find_companion,
67 .allow_idle = omap2_clkt_iclk_allow_idle,
68 .deny_idle = omap2_clkt_iclk_deny_idle,
69 };
70
71 /**
72 * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
73 * @clk: struct clk * being enabled
74 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
75 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
76 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
77 *
78 * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
79 * target IDLEST bits. For our purposes, we are concerned with the
80 * target IDLEST bits, which exist at a different bit position than
81 * the *CLKEN bit position for these modules (DSS and USBHOST) (The
82 * default find_idlest code assumes that they are at the same
83 * position.) No return value.
84 */
omap3430es2_clk_dss_usbhost_find_idlest(struct clk * clk,void __iomem ** idlest_reg,u8 * idlest_bit,u8 * idlest_val)85 static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk,
86 void __iomem **idlest_reg,
87 u8 *idlest_bit,
88 u8 *idlest_val)
89 {
90 u32 r;
91
92 r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
93 *idlest_reg = (__force void __iomem *)r;
94 /* USBHOST_IDLE has same shift */
95 *idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
96 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
97 }
98
99 const struct clkops clkops_omap3430es2_dss_usbhost_wait = {
100 .enable = omap2_dflt_clk_enable,
101 .disable = omap2_dflt_clk_disable,
102 .find_idlest = omap3430es2_clk_dss_usbhost_find_idlest,
103 .find_companion = omap2_clk_dflt_find_companion,
104 };
105
106 const struct clkops clkops_omap3430es2_iclk_dss_usbhost_wait = {
107 .enable = omap2_dflt_clk_enable,
108 .disable = omap2_dflt_clk_disable,
109 .find_idlest = omap3430es2_clk_dss_usbhost_find_idlest,
110 .find_companion = omap2_clk_dflt_find_companion,
111 .allow_idle = omap2_clkt_iclk_allow_idle,
112 .deny_idle = omap2_clkt_iclk_deny_idle,
113 };
114
115 /**
116 * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
117 * @clk: struct clk * being enabled
118 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
119 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
120 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
121 *
122 * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
123 * shift from the CM_{I,F}CLKEN bit. Pass back the correct info via
124 * @idlest_reg and @idlest_bit. No return value.
125 */
omap3430es2_clk_hsotgusb_find_idlest(struct clk * clk,void __iomem ** idlest_reg,u8 * idlest_bit,u8 * idlest_val)126 static void omap3430es2_clk_hsotgusb_find_idlest(struct clk *clk,
127 void __iomem **idlest_reg,
128 u8 *idlest_bit,
129 u8 *idlest_val)
130 {
131 u32 r;
132
133 r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
134 *idlest_reg = (__force void __iomem *)r;
135 *idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
136 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
137 }
138
139 const struct clkops clkops_omap3430es2_hsotgusb_wait = {
140 .enable = omap2_dflt_clk_enable,
141 .disable = omap2_dflt_clk_disable,
142 .find_idlest = omap3430es2_clk_hsotgusb_find_idlest,
143 .find_companion = omap2_clk_dflt_find_companion,
144 };
145
146 const struct clkops clkops_omap3430es2_iclk_hsotgusb_wait = {
147 .enable = omap2_dflt_clk_enable,
148 .disable = omap2_dflt_clk_disable,
149 .find_idlest = omap3430es2_clk_hsotgusb_find_idlest,
150 .find_companion = omap2_clk_dflt_find_companion,
151 .allow_idle = omap2_clkt_iclk_allow_idle,
152 .deny_idle = omap2_clkt_iclk_deny_idle,
153 };
154