2 * OMAP4 powerdomain control
4 * Copyright (C) 2009-2010, 2012 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>
18 #include <linux/bug.h>
20 #include "powerdomain.h"
21 #include <plat/prcm.h>
22 #include "prm2xxx_3xxx.h"
24 #include "prminst44xx.h"
25 #include "prm-regbits-44xx.h"
27 static int omap4_pwrdm_set_next_pwrst(struct powerdomain
*pwrdm
, u8 pwrst
)
29 omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK
,
30 (pwrst
<< OMAP_POWERSTATE_SHIFT
),
31 pwrdm
->prcm_partition
,
32 pwrdm
->prcm_offs
, OMAP4_PM_PWSTCTRL
);
36 static int omap4_pwrdm_read_next_pwrst(struct powerdomain
*pwrdm
)
40 v
= omap4_prminst_read_inst_reg(pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
42 v
&= OMAP_POWERSTATE_MASK
;
43 v
>>= OMAP_POWERSTATE_SHIFT
;
48 static int omap4_pwrdm_read_pwrst(struct powerdomain
*pwrdm
)
52 v
= omap4_prminst_read_inst_reg(pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
54 v
&= OMAP_POWERSTATEST_MASK
;
55 v
>>= OMAP_POWERSTATEST_SHIFT
;
60 static int omap4_pwrdm_read_prev_pwrst(struct powerdomain
*pwrdm
)
64 v
= omap4_prminst_read_inst_reg(pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
66 v
&= OMAP4430_LASTPOWERSTATEENTERED_MASK
;
67 v
>>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT
;
72 static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain
*pwrdm
)
74 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK
,
75 (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT
),
76 pwrdm
->prcm_partition
,
77 pwrdm
->prcm_offs
, OMAP4_PM_PWSTCTRL
);
81 static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain
*pwrdm
)
83 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK
,
84 OMAP4430_LASTPOWERSTATEENTERED_MASK
,
85 pwrdm
->prcm_partition
,
86 pwrdm
->prcm_offs
, OMAP4_PM_PWSTST
);
90 static int omap4_pwrdm_set_logic_retst(struct powerdomain
*pwrdm
, u8 pwrst
)
94 v
= pwrst
<< __ffs(OMAP4430_LOGICRETSTATE_MASK
);
95 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK
, v
,
96 pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
102 static int omap4_pwrdm_set_mem_onst(struct powerdomain
*pwrdm
, u8 bank
,
107 m
= omap2_pwrdm_get_mem_bank_onstate_mask(bank
);
109 omap4_prminst_rmw_inst_reg_bits(m
, (pwrst
<< __ffs(m
)),
110 pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
116 static int omap4_pwrdm_set_mem_retst(struct powerdomain
*pwrdm
, u8 bank
,
121 m
= omap2_pwrdm_get_mem_bank_retst_mask(bank
);
123 omap4_prminst_rmw_inst_reg_bits(m
, (pwrst
<< __ffs(m
)),
124 pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
130 static int omap4_pwrdm_read_logic_pwrst(struct powerdomain
*pwrdm
)
134 v
= omap4_prminst_read_inst_reg(pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
136 v
&= OMAP4430_LOGICSTATEST_MASK
;
137 v
>>= OMAP4430_LOGICSTATEST_SHIFT
;
142 static int omap4_pwrdm_read_logic_retst(struct powerdomain
*pwrdm
)
146 v
= omap4_prminst_read_inst_reg(pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
148 v
&= OMAP4430_LOGICRETSTATE_MASK
;
149 v
>>= OMAP4430_LOGICRETSTATE_SHIFT
;
155 * omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
156 * @pwrdm: struct powerdomain * to read the state for
158 * Reads the previous logic powerstate for a powerdomain. This
159 * function must determine the previous logic powerstate by first
160 * checking the previous powerstate for the domain. If that was OFF,
161 * then logic has been lost. If previous state was RETENTION, the
162 * function reads the setting for the next retention logic state to
163 * see the actual value. In every other case, the logic is
164 * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
165 * depending whether the logic was retained or not.
167 static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain
*pwrdm
)
171 state
= omap4_pwrdm_read_prev_pwrst(pwrdm
);
173 if (state
== PWRDM_POWER_OFF
)
174 return PWRDM_POWER_OFF
;
176 if (state
!= PWRDM_POWER_RET
)
177 return PWRDM_POWER_RET
;
179 return omap4_pwrdm_read_logic_retst(pwrdm
);
182 static int omap4_pwrdm_read_mem_pwrst(struct powerdomain
*pwrdm
, u8 bank
)
186 m
= omap2_pwrdm_get_mem_bank_stst_mask(bank
);
188 v
= omap4_prminst_read_inst_reg(pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
196 static int omap4_pwrdm_read_mem_retst(struct powerdomain
*pwrdm
, u8 bank
)
200 m
= omap2_pwrdm_get_mem_bank_retst_mask(bank
);
202 v
= omap4_prminst_read_inst_reg(pwrdm
->prcm_partition
, pwrdm
->prcm_offs
,
211 * omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate
212 * @pwrdm: struct powerdomain * to read mem powerstate for
213 * @bank: memory bank index
215 * Reads the previous memory powerstate for a powerdomain. This
216 * function must determine the previous memory powerstate by first
217 * checking the previous powerstate for the domain. If that was OFF,
218 * then logic has been lost. If previous state was RETENTION, the
219 * function reads the setting for the next memory retention state to
220 * see the actual value. In every other case, the logic is
221 * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
222 * depending whether logic was retained or not.
224 static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain
*pwrdm
, u8 bank
)
228 state
= omap4_pwrdm_read_prev_pwrst(pwrdm
);
230 if (state
== PWRDM_POWER_OFF
)
231 return PWRDM_POWER_OFF
;
233 if (state
!= PWRDM_POWER_RET
)
234 return PWRDM_POWER_RET
;
236 return omap4_pwrdm_read_mem_retst(pwrdm
, bank
);
239 static int omap4_pwrdm_wait_transition(struct powerdomain
*pwrdm
)
244 * REVISIT: pwrdm_wait_transition() may be better implemented
245 * via a callback and a periodic timer check -- how long do we expect
246 * powerdomain transitions to take?
249 /* XXX Is this udelay() value meaningful? */
250 while ((omap4_prminst_read_inst_reg(pwrdm
->prcm_partition
,
253 OMAP_INTRANSITION_MASK
) &&
254 (c
++ < PWRDM_TRANSITION_BAILOUT
))
257 if (c
> PWRDM_TRANSITION_BAILOUT
) {
258 pr_err("powerdomain: %s: waited too long to complete transition\n",
263 pr_debug("powerdomain: completed transition in %d loops\n", c
);
268 struct pwrdm_ops omap4_pwrdm_operations
= {
269 .pwrdm_set_next_pwrst
= omap4_pwrdm_set_next_pwrst
,
270 .pwrdm_read_next_pwrst
= omap4_pwrdm_read_next_pwrst
,
271 .pwrdm_read_pwrst
= omap4_pwrdm_read_pwrst
,
272 .pwrdm_read_prev_pwrst
= omap4_pwrdm_read_prev_pwrst
,
273 .pwrdm_set_lowpwrstchange
= omap4_pwrdm_set_lowpwrstchange
,
274 .pwrdm_clear_all_prev_pwrst
= omap4_pwrdm_clear_all_prev_pwrst
,
275 .pwrdm_set_logic_retst
= omap4_pwrdm_set_logic_retst
,
276 .pwrdm_read_logic_pwrst
= omap4_pwrdm_read_logic_pwrst
,
277 .pwrdm_read_prev_logic_pwrst
= omap4_pwrdm_read_prev_logic_pwrst
,
278 .pwrdm_read_logic_retst
= omap4_pwrdm_read_logic_retst
,
279 .pwrdm_read_mem_pwrst
= omap4_pwrdm_read_mem_pwrst
,
280 .pwrdm_read_mem_retst
= omap4_pwrdm_read_mem_retst
,
281 .pwrdm_read_prev_mem_pwrst
= omap4_pwrdm_read_prev_mem_pwrst
,
282 .pwrdm_set_mem_onst
= omap4_pwrdm_set_mem_onst
,
283 .pwrdm_set_mem_retst
= omap4_pwrdm_set_mem_retst
,
284 .pwrdm_wait_transition
= omap4_pwrdm_wait_transition
,