2 * OMAP2xxx PRM module functions
4 * Copyright (C) 2010-2012 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
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.
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
19 #include <linux/irq.h>
21 #include "powerdomain.h"
22 #include "clockdomain.h"
24 #include "cm2xxx_3xxx.h"
25 #include "prm-regbits-24xx.h"
28 * OMAP24xx PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED bits -
29 * these are reversed from the bits used on OMAP3+
31 #define OMAP24XX_PWRDM_POWER_ON 0x0
32 #define OMAP24XX_PWRDM_POWER_RET 0x1
33 #define OMAP24XX_PWRDM_POWER_OFF 0x3
36 * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
37 * hardware register (which are specific to the OMAP2xxx SoCs) to
38 * reset source ID bit shifts (which is an OMAP SoC-independent
41 static struct prm_reset_src_map omap2xxx_prm_reset_src_map
[] = {
42 { OMAP_GLOBALCOLD_RST_SHIFT
, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT
},
43 { OMAP_GLOBALWARM_RST_SHIFT
, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT
},
44 { OMAP24XX_SECU_VIOL_RST_SHIFT
, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT
},
45 { OMAP24XX_MPU_WD_RST_SHIFT
, OMAP_MPU_WD_RST_SRC_ID_SHIFT
},
46 { OMAP24XX_SECU_WD_RST_SHIFT
, OMAP_SECU_WD_RST_SRC_ID_SHIFT
},
47 { OMAP24XX_EXTWMPU_RST_SHIFT
, OMAP_EXTWARM_RST_SRC_ID_SHIFT
},
52 * omap2xxx_prm_read_reset_sources - return the last SoC reset source
54 * Return a u32 representing the last reset sources of the SoC. The
55 * returned reset source bits are standardized across OMAP SoCs.
57 static u32
omap2xxx_prm_read_reset_sources(void)
59 struct prm_reset_src_map
*p
;
63 v
= omap2_prm_read_mod_reg(WKUP_MOD
, OMAP2_RM_RSTST
);
65 p
= omap2xxx_prm_reset_src_map
;
66 while (p
->reg_shift
>= 0 && p
->std_shift
>= 0) {
67 if (v
& (1 << p
->reg_shift
))
68 r
|= 1 << p
->std_shift
;
76 * omap2xxx_pwrst_to_common_pwrst - convert OMAP2xxx pwrst to common pwrst
77 * @omap2xxx_pwrst: OMAP2xxx hardware power state to convert
79 * Return the common power state bits corresponding to the OMAP2xxx
80 * hardware power state bits @omap2xxx_pwrst, or -EINVAL upon error.
82 static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst
)
86 switch (omap2xxx_pwrst
) {
87 case OMAP24XX_PWRDM_POWER_OFF
:
88 pwrst
= PWRDM_POWER_OFF
;
90 case OMAP24XX_PWRDM_POWER_RET
:
91 pwrst
= PWRDM_POWER_RET
;
93 case OMAP24XX_PWRDM_POWER_ON
:
94 pwrst
= PWRDM_POWER_ON
;
104 * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
106 * Set the DPLL reset bit, which should reboot the SoC. This is the
107 * recommended way to restart the SoC. No return value.
109 void omap2xxx_prm_dpll_reset(void)
111 omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK
, WKUP_MOD
,
114 omap2_prm_read_mod_reg(WKUP_MOD
, OMAP2_RM_RSTCTRL
);
117 int omap2xxx_clkdm_sleep(struct clockdomain
*clkdm
)
119 omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK
,
120 clkdm
->pwrdm
.ptr
->prcm_offs
,
125 int omap2xxx_clkdm_wakeup(struct clockdomain
*clkdm
)
127 omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK
,
128 clkdm
->pwrdm
.ptr
->prcm_offs
,
133 static int omap2xxx_pwrdm_set_next_pwrst(struct powerdomain
*pwrdm
, u8 pwrst
)
138 case PWRDM_POWER_OFF
:
139 omap24xx_pwrst
= OMAP24XX_PWRDM_POWER_OFF
;
141 case PWRDM_POWER_RET
:
142 omap24xx_pwrst
= OMAP24XX_PWRDM_POWER_RET
;
145 omap24xx_pwrst
= OMAP24XX_PWRDM_POWER_ON
;
151 omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK
,
152 (omap24xx_pwrst
<< OMAP_POWERSTATE_SHIFT
),
153 pwrdm
->prcm_offs
, OMAP2_PM_PWSTCTRL
);
157 static int omap2xxx_pwrdm_read_next_pwrst(struct powerdomain
*pwrdm
)
161 omap2xxx_pwrst
= omap2_prm_read_mod_bits_shift(pwrdm
->prcm_offs
,
163 OMAP_POWERSTATE_MASK
);
165 return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst
);
168 static int omap2xxx_pwrdm_read_pwrst(struct powerdomain
*pwrdm
)
172 omap2xxx_pwrst
= omap2_prm_read_mod_bits_shift(pwrdm
->prcm_offs
,
174 OMAP_POWERSTATEST_MASK
);
176 return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst
);
179 struct pwrdm_ops omap2_pwrdm_operations
= {
180 .pwrdm_set_next_pwrst
= omap2xxx_pwrdm_set_next_pwrst
,
181 .pwrdm_read_next_pwrst
= omap2xxx_pwrdm_read_next_pwrst
,
182 .pwrdm_read_pwrst
= omap2xxx_pwrdm_read_pwrst
,
183 .pwrdm_set_logic_retst
= omap2_pwrdm_set_logic_retst
,
184 .pwrdm_set_mem_onst
= omap2_pwrdm_set_mem_onst
,
185 .pwrdm_set_mem_retst
= omap2_pwrdm_set_mem_retst
,
186 .pwrdm_read_mem_pwrst
= omap2_pwrdm_read_mem_pwrst
,
187 .pwrdm_read_mem_retst
= omap2_pwrdm_read_mem_retst
,
188 .pwrdm_wait_transition
= omap2_pwrdm_wait_transition
,
195 static struct prm_ll_data omap2xxx_prm_ll_data
= {
196 .read_reset_sources
= &omap2xxx_prm_read_reset_sources
,
199 int __init
omap2xxx_prm_init(void)
201 return prm_register(&omap2xxx_prm_ll_data
);
204 static void __exit
omap2xxx_prm_exit(void)
206 prm_unregister(&omap2xxx_prm_ll_data
);
208 __exitcall(omap2xxx_prm_exit
);