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Merge branch 'stable/for-jens-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git...
[karo-tx-linux.git] / arch / arm / mach-omap2 / prm2xxx.c
1 /*
2  * OMAP2xxx PRM module functions
3  *
4  * Copyright (C) 2010-2012 Texas Instruments, Inc.
5  * Copyright (C) 2010 Nokia Corporation
6  * BenoĆ®t 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
21 #include "common.h"
22 #include <plat/cpu.h>
23
24 #include "vp.h"
25 #include "powerdomain.h"
26 #include "clockdomain.h"
27 #include "prm2xxx.h"
28 #include "cm2xxx_3xxx.h"
29 #include "prm-regbits-24xx.h"
30
31 /*
32  * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
33  *   hardware register (which are specific to the OMAP2xxx SoCs) to
34  *   reset source ID bit shifts (which is an OMAP SoC-independent
35  *   enumeration)
36  */
37 static struct prm_reset_src_map omap2xxx_prm_reset_src_map[] = {
38         { OMAP_GLOBALCOLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
39         { OMAP_GLOBALWARM_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
40         { OMAP24XX_SECU_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
41         { OMAP24XX_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
42         { OMAP24XX_SECU_WD_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
43         { OMAP24XX_EXTWMPU_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
44         { -1, -1 },
45 };
46
47 /**
48  * omap2xxx_prm_read_reset_sources - return the last SoC reset source
49  *
50  * Return a u32 representing the last reset sources of the SoC.  The
51  * returned reset source bits are standardized across OMAP SoCs.
52  */
53 static u32 omap2xxx_prm_read_reset_sources(void)
54 {
55         struct prm_reset_src_map *p;
56         u32 r = 0;
57         u32 v;
58
59         v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
60
61         p = omap2xxx_prm_reset_src_map;
62         while (p->reg_shift >= 0 && p->std_shift >= 0) {
63                 if (v & (1 << p->reg_shift))
64                         r |= 1 << p->std_shift;
65                 p++;
66         }
67
68         return r;
69 }
70
71 /**
72  * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
73  *
74  * Set the DPLL reset bit, which should reboot the SoC.  This is the
75  * recommended way to restart the SoC.  No return value.
76  */
77 void omap2xxx_prm_dpll_reset(void)
78 {
79         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
80                                    OMAP2_RM_RSTCTRL);
81         /* OCP barrier */
82         omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
83 }
84
85 int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
86 {
87         omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
88                                    clkdm->pwrdm.ptr->prcm_offs,
89                                    OMAP2_PM_PWSTCTRL);
90         return 0;
91 }
92
93 int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
94 {
95         omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
96                                      clkdm->pwrdm.ptr->prcm_offs,
97                                      OMAP2_PM_PWSTCTRL);
98         return 0;
99 }
100
101 struct pwrdm_ops omap2_pwrdm_operations = {
102         .pwrdm_set_next_pwrst   = omap2_pwrdm_set_next_pwrst,
103         .pwrdm_read_next_pwrst  = omap2_pwrdm_read_next_pwrst,
104         .pwrdm_read_pwrst       = omap2_pwrdm_read_pwrst,
105         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
106         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
107         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
108         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
109         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
110         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
111 };
112
113 /*
114  *
115  */
116
117 static struct prm_ll_data omap2xxx_prm_ll_data = {
118         .read_reset_sources = &omap2xxx_prm_read_reset_sources,
119 };
120
121 int __init omap2xxx_prm_init(void)
122 {
123         if (!cpu_is_omap24xx())
124                 return 0;
125
126         return prm_register(&omap2xxx_prm_ll_data);
127 }
128
129 static void __exit omap2xxx_prm_exit(void)
130 {
131         if (!cpu_is_omap24xx())
132                 return;
133
134         /* Should never happen */
135         WARN(prm_unregister(&omap2xxx_prm_ll_data),
136              "%s: prm_ll_data function pointer mismatch\n", __func__);
137 }
138 __exitcall(omap2xxx_prm_exit);