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>
24 #include "powerdomain.h"
25 #include "clockdomain.h"
27 #include "cm2xxx_3xxx.h"
28 #include "prm-regbits-24xx.h"
31 * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
32 * hardware register (which are specific to the OMAP2xxx SoCs) to
33 * reset source ID bit shifts (which is an OMAP SoC-independent
36 static struct prm_reset_src_map omap2xxx_prm_reset_src_map[] = {
37 { OMAP_GLOBALCOLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
38 { OMAP_GLOBALWARM_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
39 { OMAP24XX_SECU_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
40 { OMAP24XX_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
41 { OMAP24XX_SECU_WD_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
42 { OMAP24XX_EXTWMPU_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
47 * omap2xxx_prm_read_reset_sources - return the last SoC reset source
49 * Return a u32 representing the last reset sources of the SoC. The
50 * returned reset source bits are standardized across OMAP SoCs.
52 static u32 omap2xxx_prm_read_reset_sources(void)
54 struct prm_reset_src_map *p;
58 v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
60 p = omap2xxx_prm_reset_src_map;
61 while (p->reg_shift >= 0 && p->std_shift >= 0) {
62 if (v & (1 << p->reg_shift))
63 r |= 1 << p->std_shift;
71 * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
73 * Set the DPLL reset bit, which should reboot the SoC. This is the
74 * recommended way to restart the SoC. No return value.
76 void omap2xxx_prm_dpll_reset(void)
78 omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
81 omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
84 int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
86 omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
87 clkdm->pwrdm.ptr->prcm_offs,
92 int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
94 omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
95 clkdm->pwrdm.ptr->prcm_offs,
100 struct pwrdm_ops omap2_pwrdm_operations = {
101 .pwrdm_set_next_pwrst = omap2_pwrdm_set_next_pwrst,
102 .pwrdm_read_next_pwrst = omap2_pwrdm_read_next_pwrst,
103 .pwrdm_read_pwrst = omap2_pwrdm_read_pwrst,
104 .pwrdm_set_logic_retst = omap2_pwrdm_set_logic_retst,
105 .pwrdm_set_mem_onst = omap2_pwrdm_set_mem_onst,
106 .pwrdm_set_mem_retst = omap2_pwrdm_set_mem_retst,
107 .pwrdm_read_mem_pwrst = omap2_pwrdm_read_mem_pwrst,
108 .pwrdm_read_mem_retst = omap2_pwrdm_read_mem_retst,
109 .pwrdm_wait_transition = omap2_pwrdm_wait_transition,
116 static struct prm_ll_data omap2xxx_prm_ll_data = {
117 .read_reset_sources = &omap2xxx_prm_read_reset_sources,
120 int __init omap2xxx_prm_init(void)
122 if (!cpu_is_omap24xx())
125 return prm_register(&omap2xxx_prm_ll_data);
128 static void __exit omap2xxx_prm_exit(void)
130 if (!cpu_is_omap24xx())
133 /* Should never happen */
134 WARN(prm_unregister(&omap2xxx_prm_ll_data),
135 "%s: prm_ll_data function pointer mismatch\n", __func__);
137 __exitcall(omap2xxx_prm_exit);