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 */
omap3430es2_clk_ssi_find_idlest(struct clk_hw_omap * clk,void __iomem ** idlest_reg,u8 * idlest_bit,u8 * idlest_val)40 static 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 }
52 const 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
57 const 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 */
omap3430es2_clk_dss_usbhost_find_idlest(struct clk_hw_omap * clk,void __iomem ** idlest_reg,u8 * idlest_bit,u8 * idlest_val)78 static 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
92 const 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
97 const 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 */
omap3430es2_clk_hsotgusb_find_idlest(struct clk_hw_omap * clk,void __iomem ** idlest_reg,u8 * idlest_bit,u8 * idlest_val)115 static 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
128 const 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
135 const 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