2 * OMAP4 powerdomain control
4 * Copyright (C) 2009-2010 Texas Instruments, Inc.
5 * Copyright (C) 2007-2009 Nokia Corporation
7 * Derived from mach-omap2/powerdomain.c written by Paul Walmsley
8 * Rajendra Nayak <rnayak@ti.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 #include <linux/errno.h>
17 #include <linux/delay.h>
19 #include <plat/powerdomain.h>
20 #include <plat/prcm.h>
22 #include "prm-regbits-44xx.h"
23 #include "powerdomains.h"
25 static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
27 prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
28 (pwrst << OMAP_POWERSTATE_SHIFT),
29 pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
33 static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
35 return prm_read_mod_bits_shift(pwrdm->prcm_offs,
36 OMAP4_PM_PWSTCTRL, OMAP_POWERSTATE_MASK);
39 static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
41 return prm_read_mod_bits_shift(pwrdm->prcm_offs,
42 OMAP4_PM_PWSTST, OMAP_POWERSTATEST_MASK);
45 static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
47 return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST,
48 OMAP4430_LASTPOWERSTATEENTERED_MASK);
51 static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
53 prm_rmw_mod_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
54 (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
55 pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
59 static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
61 prm_rmw_mod_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
62 OMAP4430_LASTPOWERSTATEENTERED_MASK,
63 pwrdm->prcm_offs, OMAP4_PM_PWSTST);
67 static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
71 v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK);
72 prm_rmw_mod_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v,
73 pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
78 static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
83 m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
85 prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
91 static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
96 m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
98 prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
104 static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
106 return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST,
107 OMAP4430_LOGICSTATEST_MASK);
110 static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
112 return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL,
113 OMAP4430_LOGICRETSTATE_MASK);
116 static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
120 m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
122 return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTST, m);
125 static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
129 m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
131 return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL, m);
134 static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
139 * REVISIT: pwrdm_wait_transition() may be better implemented
140 * via a callback and a periodic timer check -- how long do we expect
141 * powerdomain transitions to take?
144 /* XXX Is this udelay() value meaningful? */
145 while ((prm_read_mod_reg(pwrdm->prcm_offs, OMAP4_PM_PWSTST) &
146 OMAP_INTRANSITION_MASK) &&
147 (c++ < PWRDM_TRANSITION_BAILOUT))
150 if (c > PWRDM_TRANSITION_BAILOUT) {
151 printk(KERN_ERR "powerdomain: waited too long for "
152 "powerdomain %s to complete transition\n", pwrdm->name);
156 pr_debug("powerdomain: completed transition in %d loops\n", c);
161 struct pwrdm_ops omap4_pwrdm_operations = {
162 .pwrdm_set_next_pwrst = omap4_pwrdm_set_next_pwrst,
163 .pwrdm_read_next_pwrst = omap4_pwrdm_read_next_pwrst,
164 .pwrdm_read_pwrst = omap4_pwrdm_read_pwrst,
165 .pwrdm_read_prev_pwrst = omap4_pwrdm_read_prev_pwrst,
166 .pwrdm_set_lowpwrstchange = omap4_pwrdm_set_lowpwrstchange,
167 .pwrdm_clear_all_prev_pwrst = omap4_pwrdm_clear_all_prev_pwrst,
168 .pwrdm_set_logic_retst = omap4_pwrdm_set_logic_retst,
169 .pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst,
170 .pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst,
171 .pwrdm_read_mem_pwrst = omap4_pwrdm_read_mem_pwrst,
172 .pwrdm_read_mem_retst = omap4_pwrdm_read_mem_retst,
173 .pwrdm_set_mem_onst = omap4_pwrdm_set_mem_onst,
174 .pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst,
175 .pwrdm_wait_transition = omap4_pwrdm_wait_transition,