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Paul Walmsley02e19a92008-03-18 15:09:51 +02001/*
2 * OMAP3-specific clock framework functions
3 *
Paul Walmsley542313c2008-07-03 12:24:45 +03004 * Copyright (C) 2007-2008 Texas Instruments, Inc.
Paul Walmsleyda4d2902010-01-26 20:13:10 -07005 * Copyright (C) 2007-2010 Nokia Corporation
Paul Walmsley02e19a92008-03-18 15:09:51 +02006 *
Paul Walmsleyda4d2902010-01-26 20:13:10 -07007 * Paul Walmsley
8 * Jouni Högander
Paul Walmsley02e19a92008-03-18 15:09:51 +02009 *
10 * Parts of this code are based on code written by
Paul Walmsley657ebfa2010-02-22 22:09:20 -070011 * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu,
12 * Russell King
Paul Walmsley02e19a92008-03-18 15:09:51 +020013 *
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
Paul Walmsley02e19a92008-03-18 15:09:51 +020020#include <linux/kernel.h>
Paul Walmsley02e19a92008-03-18 15:09:51 +020021#include <linux/clk.h>
22#include <linux/io.h>
23
Tony Lindgrence491cf2009-10-20 09:40:47 -070024#include <plat/clock.h>
Paul Walmsley02e19a92008-03-18 15:09:51 +020025
Paul Walmsley02e19a92008-03-18 15:09:51 +020026#include "clock.h"
Paul Walmsley82e9bd52009-12-08 16:18:47 -070027#include "clock34xx.h"
Paul Walmsley02e19a92008-03-18 15:09:51 +020028#include "cm.h"
29#include "cm-regbits-34xx.h"
30
Paul Walmsley02e19a92008-03-18 15:09:51 +020031/**
Paul Walmsley3c82e222009-07-24 19:44:06 -060032 * 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
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -070036 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
Paul Walmsley3c82e222009-07-24 19:44:06 -060037 *
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 */
42static void omap3430es2_clk_ssi_find_idlest(struct clk *clk,
43 void __iomem **idlest_reg,
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -070044 u8 *idlest_bit,
45 u8 *idlest_val)
Paul Walmsley3c82e222009-07-24 19:44:06 -060046{
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;
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -070052 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
Paul Walmsley3c82e222009-07-24 19:44:06 -060053}
54
Paul Walmsley82e9bd52009-12-08 16:18:47 -070055const 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
Paul Walmsley3c82e222009-07-24 19:44:06 -060062/**
63 * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
64 * @clk: struct clk * being enabled
65 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
66 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -070067 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
Paul Walmsley3c82e222009-07-24 19:44:06 -060068 *
69 * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
70 * target IDLEST bits. For our purposes, we are concerned with the
71 * target IDLEST bits, which exist at a different bit position than
72 * the *CLKEN bit position for these modules (DSS and USBHOST) (The
73 * default find_idlest code assumes that they are at the same
74 * position.) No return value.
75 */
76static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk,
77 void __iomem **idlest_reg,
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -070078 u8 *idlest_bit,
79 u8 *idlest_val)
Paul Walmsley3c82e222009-07-24 19:44:06 -060080{
81 u32 r;
82
83 r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
84 *idlest_reg = (__force void __iomem *)r;
85 /* USBHOST_IDLE has same shift */
86 *idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -070087 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
Paul Walmsley3c82e222009-07-24 19:44:06 -060088}
89
Paul Walmsley82e9bd52009-12-08 16:18:47 -070090const struct clkops clkops_omap3430es2_dss_usbhost_wait = {
91 .enable = omap2_dflt_clk_enable,
92 .disable = omap2_dflt_clk_disable,
93 .find_idlest = omap3430es2_clk_dss_usbhost_find_idlest,
94 .find_companion = omap2_clk_dflt_find_companion,
95};
96
Paul Walmsley3c82e222009-07-24 19:44:06 -060097/**
98 * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
99 * @clk: struct clk * being enabled
100 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
101 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -0700102 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
Paul Walmsley3c82e222009-07-24 19:44:06 -0600103 *
104 * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
105 * shift from the CM_{I,F}CLKEN bit. Pass back the correct info via
106 * @idlest_reg and @idlest_bit. No return value.
107 */
108static void omap3430es2_clk_hsotgusb_find_idlest(struct clk *clk,
109 void __iomem **idlest_reg,
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -0700110 u8 *idlest_bit,
111 u8 *idlest_val)
Paul Walmsley3c82e222009-07-24 19:44:06 -0600112{
113 u32 r;
114
115 r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
116 *idlest_reg = (__force void __iomem *)r;
117 *idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
Ranjith Lohithakshan419cc972010-02-24 12:05:54 -0700118 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
Paul Walmsley3c82e222009-07-24 19:44:06 -0600119}
120
Paul Walmsley82e9bd52009-12-08 16:18:47 -0700121const struct clkops clkops_omap3430es2_hsotgusb_wait = {
122 .enable = omap2_dflt_clk_enable,
123 .disable = omap2_dflt_clk_disable,
124 .find_idlest = omap3430es2_clk_hsotgusb_find_idlest,
125 .find_companion = omap2_clk_dflt_find_companion,
126};