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49815399 PW |
1 | /* |
2 | * OMAP2xxx PRM module functions | |
3 | * | |
4 | * Copyright (C) 2010-2012 Texas Instruments, Inc. | |
5 | * Copyright (C) 2010 Nokia Corporation | |
6 | * BenoƮt Cousson | |
7 | * Paul Walmsley | |
8 | * Rajendra Nayak <rnayak@ti.com> | |
9 | * | |
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. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/irq.h> | |
20 | ||
49815399 | 21 | #include "powerdomain.h" |
4bd5259e | 22 | #include "clockdomain.h" |
49815399 PW |
23 | #include "prm2xxx.h" |
24 | #include "cm2xxx_3xxx.h" | |
25 | #include "prm-regbits-24xx.h" | |
26 | ||
7e7fff82 PW |
27 | /* |
28 | * OMAP24xx PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED bits - | |
29 | * these are reversed from the bits used on OMAP3+ | |
30 | */ | |
31 | #define OMAP24XX_PWRDM_POWER_ON 0x0 | |
32 | #define OMAP24XX_PWRDM_POWER_RET 0x1 | |
33 | #define OMAP24XX_PWRDM_POWER_OFF 0x3 | |
34 | ||
2bb2a5d3 PW |
35 | /* |
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 | |
39 | * enumeration) | |
40 | */ | |
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 }, | |
48 | { -1, -1 }, | |
49 | }; | |
50 | ||
51 | /** | |
52 | * omap2xxx_prm_read_reset_sources - return the last SoC reset source | |
53 | * | |
54 | * Return a u32 representing the last reset sources of the SoC. The | |
55 | * returned reset source bits are standardized across OMAP SoCs. | |
56 | */ | |
57 | static u32 omap2xxx_prm_read_reset_sources(void) | |
58 | { | |
59 | struct prm_reset_src_map *p; | |
60 | u32 r = 0; | |
61 | u32 v; | |
62 | ||
63 | v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST); | |
64 | ||
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; | |
69 | p++; | |
70 | } | |
71 | ||
72 | return r; | |
73 | } | |
74 | ||
7e7fff82 PW |
75 | /** |
76 | * omap2xxx_pwrst_to_common_pwrst - convert OMAP2xxx pwrst to common pwrst | |
77 | * @omap2xxx_pwrst: OMAP2xxx hardware power state to convert | |
78 | * | |
79 | * Return the common power state bits corresponding to the OMAP2xxx | |
80 | * hardware power state bits @omap2xxx_pwrst, or -EINVAL upon error. | |
81 | */ | |
82 | static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst) | |
83 | { | |
84 | u8 pwrst; | |
85 | ||
86 | switch (omap2xxx_pwrst) { | |
87 | case OMAP24XX_PWRDM_POWER_OFF: | |
88 | pwrst = PWRDM_POWER_OFF; | |
89 | break; | |
90 | case OMAP24XX_PWRDM_POWER_RET: | |
91 | pwrst = PWRDM_POWER_RET; | |
92 | break; | |
93 | case OMAP24XX_PWRDM_POWER_ON: | |
94 | pwrst = PWRDM_POWER_ON; | |
95 | break; | |
96 | default: | |
97 | return -EINVAL; | |
98 | } | |
99 | ||
100 | return pwrst; | |
101 | } | |
102 | ||
d08cce6a PW |
103 | /** |
104 | * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC | |
105 | * | |
106 | * Set the DPLL reset bit, which should reboot the SoC. This is the | |
107 | * recommended way to restart the SoC. No return value. | |
108 | */ | |
109 | void omap2xxx_prm_dpll_reset(void) | |
110 | { | |
111 | omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD, | |
112 | OMAP2_RM_RSTCTRL); | |
113 | /* OCP barrier */ | |
114 | omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL); | |
115 | } | |
116 | ||
4bd5259e PW |
117 | int omap2xxx_clkdm_sleep(struct clockdomain *clkdm) |
118 | { | |
119 | omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK, | |
120 | clkdm->pwrdm.ptr->prcm_offs, | |
121 | OMAP2_PM_PWSTCTRL); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm) | |
126 | { | |
127 | omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK, | |
128 | clkdm->pwrdm.ptr->prcm_offs, | |
129 | OMAP2_PM_PWSTCTRL); | |
130 | return 0; | |
131 | } | |
132 | ||
7e7fff82 PW |
133 | static int omap2xxx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) |
134 | { | |
135 | u8 omap24xx_pwrst; | |
136 | ||
137 | switch (pwrst) { | |
138 | case PWRDM_POWER_OFF: | |
139 | omap24xx_pwrst = OMAP24XX_PWRDM_POWER_OFF; | |
140 | break; | |
141 | case PWRDM_POWER_RET: | |
142 | omap24xx_pwrst = OMAP24XX_PWRDM_POWER_RET; | |
143 | break; | |
144 | case PWRDM_POWER_ON: | |
145 | omap24xx_pwrst = OMAP24XX_PWRDM_POWER_ON; | |
146 | break; | |
147 | default: | |
148 | return -EINVAL; | |
149 | } | |
150 | ||
151 | omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK, | |
152 | (omap24xx_pwrst << OMAP_POWERSTATE_SHIFT), | |
153 | pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static int omap2xxx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm) | |
158 | { | |
159 | u8 omap2xxx_pwrst; | |
160 | ||
161 | omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, | |
162 | OMAP2_PM_PWSTCTRL, | |
163 | OMAP_POWERSTATE_MASK); | |
164 | ||
165 | return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst); | |
166 | } | |
167 | ||
168 | static int omap2xxx_pwrdm_read_pwrst(struct powerdomain *pwrdm) | |
169 | { | |
170 | u8 omap2xxx_pwrst; | |
171 | ||
172 | omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, | |
173 | OMAP2_PM_PWSTST, | |
174 | OMAP_POWERSTATEST_MASK); | |
175 | ||
176 | return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst); | |
177 | } | |
178 | ||
49815399 | 179 | struct pwrdm_ops omap2_pwrdm_operations = { |
7e7fff82 PW |
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, | |
49815399 PW |
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, | |
189 | }; | |
2bb2a5d3 PW |
190 | |
191 | /* | |
192 | * | |
193 | */ | |
194 | ||
195 | static struct prm_ll_data omap2xxx_prm_ll_data = { | |
196 | .read_reset_sources = &omap2xxx_prm_read_reset_sources, | |
197 | }; | |
198 | ||
63a293e0 | 199 | int __init omap2xxx_prm_init(void) |
2bb2a5d3 | 200 | { |
2bb2a5d3 PW |
201 | return prm_register(&omap2xxx_prm_ll_data); |
202 | } | |
2bb2a5d3 PW |
203 | |
204 | static void __exit omap2xxx_prm_exit(void) | |
205 | { | |
d8871cd2 | 206 | prm_unregister(&omap2xxx_prm_ll_data); |
2bb2a5d3 PW |
207 | } |
208 | __exitcall(omap2xxx_prm_exit); |