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>
25 #include "powerdomain.h"
26 #include "clockdomain.h"
28 #include "cm2xxx_3xxx.h"
29 #include "prm-regbits-24xx.h"
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
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 },
48 * omap2xxx_prm_read_reset_sources - return the last SoC reset source
50 * Return a u32 representing the last reset sources of the SoC. The
51 * returned reset source bits are standardized across OMAP SoCs.
53 static u32 omap2xxx_prm_read_reset_sources(void)
55 struct prm_reset_src_map *p;
59 v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
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;
72 * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
74 * Set the DPLL reset bit, which should reboot the SoC. This is the
75 * recommended way to restart the SoC. No return value.
77 void omap2xxx_prm_dpll_reset(void)
79 omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
82 omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
85 int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
87 omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
88 clkdm->pwrdm.ptr->prcm_offs,
93 int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
95 omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
96 clkdm->pwrdm.ptr->prcm_offs,
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,
117 static struct prm_ll_data omap2xxx_prm_ll_data = {
118 .read_reset_sources = &omap2xxx_prm_read_reset_sources,
121 int __init omap2xxx_prm_init(void)
123 if (!cpu_is_omap24xx())
126 return prm_register(&omap2xxx_prm_ll_data);
129 static void __exit omap2xxx_prm_exit(void)
131 if (!cpu_is_omap24xx())
134 /* Should never happen */
135 WARN(prm_unregister(&omap2xxx_prm_ll_data),
136 "%s: prm_ll_data function pointer mismatch\n", __func__);
138 __exitcall(omap2xxx_prm_exit);