1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OMAP2xxx PRM module functions
4 *
5 * Copyright (C) 2010-2012 Texas Instruments, Inc.
6 * Copyright (C) 2010 Nokia Corporation
7 * Benoît Cousson
8 * Paul Walmsley
9 * Rajendra Nayak <rnayak@ti.com>
10 */
11
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/err.h>
15#include <linux/io.h>
16#include <linux/irq.h>
17
18#include "powerdomain.h"
19#include "clockdomain.h"
20#include "prm2xxx.h"
21#include "cm2xxx_3xxx.h"
22#include "prm-regbits-24xx.h"
23
24/*
25 * OMAP24xx PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED bits -
26 * these are reversed from the bits used on OMAP3+
27 */
28#define OMAP24XX_PWRDM_POWER_ON 0x0
29#define OMAP24XX_PWRDM_POWER_RET 0x1
30#define OMAP24XX_PWRDM_POWER_OFF 0x3
31
32/*
33 * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
34 * hardware register (which are specific to the OMAP2xxx SoCs) to
35 * reset source ID bit shifts (which is an OMAP SoC-independent
36 * enumeration)
37 */
38static struct prm_reset_src_map omap2xxx_prm_reset_src_map[] = {
39 { OMAP_GLOBALCOLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
40 { OMAP_GLOBALWARM_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
41 { OMAP24XX_SECU_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
42 { OMAP24XX_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
43 { OMAP24XX_SECU_WD_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
44 { OMAP24XX_EXTWMPU_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
45 { -1, -1 },
46};
47
48/**
49 * omap2xxx_prm_read_reset_sources - return the last SoC reset source
50 *
51 * Return a u32 representing the last reset sources of the SoC. The
52 * returned reset source bits are standardized across OMAP SoCs.
53 */
54static u32 omap2xxx_prm_read_reset_sources(void)
55{
56 struct prm_reset_src_map *p;
57 u32 r = 0;
58 u32 v;
59
60 v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
61
62 p = omap2xxx_prm_reset_src_map;
63 while (p->reg_shift >= 0 && p->std_shift >= 0) {
64 if (v & (1 << p->reg_shift))
65 r |= 1 << p->std_shift;
66 p++;
67 }
68
69 return r;
70}
71
72/**
73 * omap2xxx_pwrst_to_common_pwrst - convert OMAP2xxx pwrst to common pwrst
74 * @omap2xxx_pwrst: OMAP2xxx hardware power state to convert
75 *
76 * Return the common power state bits corresponding to the OMAP2xxx
77 * hardware power state bits @omap2xxx_pwrst, or -EINVAL upon error.
78 */
79static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst)
80{
81 u8 pwrst;
82
83 switch (omap2xxx_pwrst) {
84 case OMAP24XX_PWRDM_POWER_OFF:
85 pwrst = PWRDM_POWER_OFF;
86 break;
87 case OMAP24XX_PWRDM_POWER_RET:
88 pwrst = PWRDM_POWER_RET;
89 break;
90 case OMAP24XX_PWRDM_POWER_ON:
91 pwrst = PWRDM_POWER_ON;
92 break;
93 default:
94 return -EINVAL;
95 }
96
97 return pwrst;
98}
99
100/**
101 * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
102 *
103 * Set the DPLL reset bit, which should reboot the SoC. This is the
104 * recommended way to restart the SoC. No return value.
105 */
106static void omap2xxx_prm_dpll_reset(void)
107{
108 omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
109 OMAP2_RM_RSTCTRL);
110 /* OCP barrier */
111 omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
112}
113
114/**
115 * omap2xxx_prm_clear_mod_irqs - clear wakeup status bits for a module
116 * @module: PRM module to clear wakeups from
117 * @regs: register offset to clear
118 * @wkst_mask: wakeup status mask to clear
119 *
120 * Clears wakeup status bits for a given module, so that the device can
121 * re-enter idle.
122 */
123static int omap2xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 wkst_mask)
124{
125 u32 wkst;
126
127 wkst = omap2_prm_read_mod_reg(module, idx: regs);
128 wkst &= wkst_mask;
129 omap2_prm_write_mod_reg(val: wkst, module, idx: regs);
130 return 0;
131}
132
133int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
134{
135 omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
136 module: clkdm->pwrdm.ptr->prcm_offs,
137 OMAP2_PM_PWSTCTRL);
138 return 0;
139}
140
141int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
142{
143 omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
144 module: clkdm->pwrdm.ptr->prcm_offs,
145 OMAP2_PM_PWSTCTRL);
146 return 0;
147}
148
149static int omap2xxx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
150{
151 u8 omap24xx_pwrst;
152
153 switch (pwrst) {
154 case PWRDM_POWER_OFF:
155 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_OFF;
156 break;
157 case PWRDM_POWER_RET:
158 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_RET;
159 break;
160 case PWRDM_POWER_ON:
161 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_ON;
162 break;
163 default:
164 return -EINVAL;
165 }
166
167 omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
168 bits: (omap24xx_pwrst << OMAP_POWERSTATE_SHIFT),
169 module: pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
170 return 0;
171}
172
173static int omap2xxx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
174{
175 u8 omap2xxx_pwrst;
176
177 omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
178 OMAP2_PM_PWSTCTRL,
179 OMAP_POWERSTATE_MASK);
180
181 return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
182}
183
184static int omap2xxx_pwrdm_read_pwrst(struct powerdomain *pwrdm)
185{
186 u8 omap2xxx_pwrst;
187
188 omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
189 OMAP2_PM_PWSTST,
190 OMAP_POWERSTATEST_MASK);
191
192 return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
193}
194
195struct pwrdm_ops omap2_pwrdm_operations = {
196 .pwrdm_set_next_pwrst = omap2xxx_pwrdm_set_next_pwrst,
197 .pwrdm_read_next_pwrst = omap2xxx_pwrdm_read_next_pwrst,
198 .pwrdm_read_pwrst = omap2xxx_pwrdm_read_pwrst,
199 .pwrdm_set_logic_retst = omap2_pwrdm_set_logic_retst,
200 .pwrdm_set_mem_onst = omap2_pwrdm_set_mem_onst,
201 .pwrdm_set_mem_retst = omap2_pwrdm_set_mem_retst,
202 .pwrdm_read_mem_pwrst = omap2_pwrdm_read_mem_pwrst,
203 .pwrdm_read_mem_retst = omap2_pwrdm_read_mem_retst,
204 .pwrdm_wait_transition = omap2_pwrdm_wait_transition,
205};
206
207/*
208 *
209 */
210
211static struct prm_ll_data omap2xxx_prm_ll_data = {
212 .read_reset_sources = &omap2xxx_prm_read_reset_sources,
213 .assert_hardreset = &omap2_prm_assert_hardreset,
214 .deassert_hardreset = &omap2_prm_deassert_hardreset,
215 .is_hardreset_asserted = &omap2_prm_is_hardreset_asserted,
216 .reset_system = &omap2xxx_prm_dpll_reset,
217 .clear_mod_irqs = &omap2xxx_prm_clear_mod_irqs,
218};
219
220int __init omap2xxx_prm_init(const struct omap_prcm_init_data *data)
221{
222 return prm_register(pld: &omap2xxx_prm_ll_data);
223}
224
225static void __exit omap2xxx_prm_exit(void)
226{
227 prm_unregister(pld: &omap2xxx_prm_ll_data);
228}
229__exitcall(omap2xxx_prm_exit);
230

source code of linux/arch/arm/mach-omap2/prm2xxx.c