1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * AM33XX Arch Power Management Routines
4 *
5 * Copyright (C) 2016-2018 Texas Instruments Incorporated - http://www.ti.com/
6 * Dave Gerlach
7 */
9 #include <asm/smp_scu.h>
10 #include <asm/suspend.h>
11 #include <linux/errno.h>
12 #include <linux/platform_data/pm33xx.h>
14 #include "cm33xx.h"
15 #include "common.h"
16 #include "control.h"
17 #include "clockdomain.h"
18 #include "iomap.h"
19 #include "omap_hwmod.h"
20 #include "pm.h"
21 #include "powerdomain.h"
22 #include "prm33xx.h"
23 #include "soc.h"
24 #include "sram.h"
26 static struct powerdomain *cefuse_pwrdm, *gfx_pwrdm, *per_pwrdm, *mpu_pwrdm;
27 static struct clockdomain *gfx_l4ls_clkdm;
28 static void __iomem *scu_base;
29 static struct omap_hwmod *rtc_oh;
31 static int __init am43xx_map_scu(void)
32 {
33 scu_base = ioremap(scu_a9_get_base(), SZ_256);
35 if (!scu_base)
36 return -ENOMEM;
38 return 0;
39 }
41 static int amx3_common_init(void)
42 {
43 gfx_pwrdm = pwrdm_lookup("gfx_pwrdm");
44 per_pwrdm = pwrdm_lookup("per_pwrdm");
45 mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
47 if ((!gfx_pwrdm) || (!per_pwrdm) || (!mpu_pwrdm))
48 return -ENODEV;
50 (void)clkdm_for_each(omap_pm_clkdms_setup, NULL);
52 /* CEFUSE domain can be turned off post bootup */
53 cefuse_pwrdm = pwrdm_lookup("cefuse_pwrdm");
54 if (cefuse_pwrdm)
55 omap_set_pwrdm_state(cefuse_pwrdm, PWRDM_POWER_OFF);
56 else
57 pr_err("PM: Failed to get cefuse_pwrdm\n");
59 return 0;
60 }
62 static int am33xx_suspend_init(void)
63 {
64 int ret;
66 gfx_l4ls_clkdm = clkdm_lookup("gfx_l4ls_gfx_clkdm");
68 if (!gfx_l4ls_clkdm) {
69 pr_err("PM: Cannot lookup gfx_l4ls_clkdm clockdomains\n");
70 return -ENODEV;
71 }
73 ret = amx3_common_init();
75 return ret;
76 }
78 static int am43xx_suspend_init(void)
79 {
80 int ret = 0;
82 ret = am43xx_map_scu();
83 if (ret) {
84 pr_err("PM: Could not ioremap SCU\n");
85 return ret;
86 }
88 ret = amx3_common_init();
90 return ret;
91 }
93 static void amx3_pre_suspend_common(void)
94 {
95 omap_set_pwrdm_state(gfx_pwrdm, PWRDM_POWER_OFF);
96 }
98 static void amx3_post_suspend_common(void)
99 {
100 int status;
101 /*
102 * Because gfx_pwrdm is the only one under MPU control,
103 * comment on transition status
104 */
105 status = pwrdm_read_pwrst(gfx_pwrdm);
106 if (status != PWRDM_POWER_OFF)
107 pr_err("PM: GFX domain did not transition: %x\n", status);
108 }
110 static int am33xx_suspend(unsigned int state, int (*fn)(unsigned long),
111 unsigned long args)
112 {
113 int ret = 0;
115 amx3_pre_suspend_common();
116 ret = cpu_suspend(args, fn);
117 amx3_post_suspend_common();
119 /*
120 * BUG: GFX_L4LS clock domain needs to be woken up to
121 * ensure thet L4LS clock domain does not get stuck in
122 * transition. If that happens L3 module does not get
123 * disabled, thereby leading to PER power domain
124 * transition failing
125 */
127 clkdm_wakeup(gfx_l4ls_clkdm);
128 clkdm_sleep(gfx_l4ls_clkdm);
130 return ret;
131 }
133 static int am43xx_suspend(unsigned int state, int (*fn)(unsigned long),
134 unsigned long args)
135 {
136 int ret = 0;
138 amx3_pre_suspend_common();
139 scu_power_mode(scu_base, SCU_PM_POWEROFF);
140 ret = cpu_suspend(args, fn);
141 scu_power_mode(scu_base, SCU_PM_NORMAL);
142 amx3_post_suspend_common();
144 return ret;
145 }
147 static struct am33xx_pm_sram_addr *amx3_get_sram_addrs(void)
148 {
149 if (soc_is_am33xx())
150 return &am33xx_pm_sram;
151 else if (soc_is_am437x())
152 return &am43xx_pm_sram;
153 else
154 return NULL;
155 }
157 void __iomem *am43xx_get_rtc_base_addr(void)
158 {
159 rtc_oh = omap_hwmod_lookup("rtc");
161 return omap_hwmod_get_mpu_rt_va(rtc_oh);
162 }
164 static struct am33xx_pm_platform_data am33xx_ops = {
165 .init = am33xx_suspend_init,
166 .soc_suspend = am33xx_suspend,
167 .get_sram_addrs = amx3_get_sram_addrs,
168 .get_rtc_base_addr = am43xx_get_rtc_base_addr,
169 };
171 static struct am33xx_pm_platform_data am43xx_ops = {
172 .init = am43xx_suspend_init,
173 .soc_suspend = am43xx_suspend,
174 .get_sram_addrs = amx3_get_sram_addrs,
175 .get_rtc_base_addr = am43xx_get_rtc_base_addr,
176 };
178 static struct am33xx_pm_platform_data *am33xx_pm_get_pdata(void)
179 {
180 if (soc_is_am33xx())
181 return &am33xx_ops;
182 else if (soc_is_am437x())
183 return &am43xx_ops;
184 else
185 return NULL;
186 }
188 int __init amx3_common_pm_init(void)
189 {
190 struct am33xx_pm_platform_data *pdata;
191 struct platform_device_info devinfo;
193 pdata = am33xx_pm_get_pdata();
195 memset(&devinfo, 0, sizeof(devinfo));
196 devinfo.name = "pm33xx";
197 devinfo.data = pdata;
198 devinfo.size_data = sizeof(*pdata);
199 devinfo.id = -1;
200 platform_device_register_full(&devinfo);
202 return 0;
203 }