1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * DaVinci Power Management Routines
4 *
5 * Copyright (C) 2009 Texas Instruments, Inc. https://www.ti.com/
6 */
7
8 #include <linux/pm.h>
9 #include <linux/suspend.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/clk.h>
13 #include <linux/spinlock.h>
14
15 #include <asm/cacheflush.h>
16 #include <asm/delay.h>
17 #include <asm/io.h>
18
19 #include "common.h"
20 #include "da8xx.h"
21 #include "mux.h"
22 #include "pm.h"
23 #include "clock.h"
24 #include "psc.h"
25 #include "sram.h"
26
27 #define DA850_PLL1_BASE 0x01e1a000
28 #define DEEPSLEEP_SLEEPCOUNT_MASK 0xFFFF
29 #define DEEPSLEEP_SLEEPCOUNT 128
30
31 static void (*davinci_sram_suspend) (struct davinci_pm_config *);
32 static struct davinci_pm_config pm_config = {
33 .sleepcount = DEEPSLEEP_SLEEPCOUNT,
34 .ddrpsc_num = DA8XX_LPSC1_EMIF3C,
35 };
36
davinci_sram_push(void * dest,void * src,unsigned int size)37 static void davinci_sram_push(void *dest, void *src, unsigned int size)
38 {
39 memcpy(dest, src, size);
40 flush_icache_range((unsigned long)dest, (unsigned long)(dest + size));
41 }
42
davinci_pm_suspend(void)43 static void davinci_pm_suspend(void)
44 {
45 unsigned val;
46
47 if (pm_config.cpupll_reg_base != pm_config.ddrpll_reg_base) {
48
49 /* Switch CPU PLL to bypass mode */
50 val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL);
51 val &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
52 __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL);
53
54 udelay(PLL_BYPASS_TIME);
55
56 /* Powerdown CPU PLL */
57 val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL);
58 val |= PLLCTL_PLLPWRDN;
59 __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL);
60 }
61
62 /* Configure sleep count in deep sleep register */
63 val = __raw_readl(pm_config.deepsleep_reg);
64 val &= ~DEEPSLEEP_SLEEPCOUNT_MASK;
65 val |= pm_config.sleepcount;
66 __raw_writel(val, pm_config.deepsleep_reg);
67
68 /* System goes to sleep in this call */
69 davinci_sram_suspend(&pm_config);
70
71 if (pm_config.cpupll_reg_base != pm_config.ddrpll_reg_base) {
72
73 /* put CPU PLL in reset */
74 val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL);
75 val &= ~PLLCTL_PLLRST;
76 __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL);
77
78 /* put CPU PLL in power down */
79 val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL);
80 val &= ~PLLCTL_PLLPWRDN;
81 __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL);
82
83 /* wait for CPU PLL reset */
84 udelay(PLL_RESET_TIME);
85
86 /* bring CPU PLL out of reset */
87 val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL);
88 val |= PLLCTL_PLLRST;
89 __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL);
90
91 /* Wait for CPU PLL to lock */
92 udelay(PLL_LOCK_TIME);
93
94 /* Remove CPU PLL from bypass mode */
95 val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL);
96 val &= ~PLLCTL_PLLENSRC;
97 val |= PLLCTL_PLLEN;
98 __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL);
99 }
100 }
101
davinci_pm_enter(suspend_state_t state)102 static int davinci_pm_enter(suspend_state_t state)
103 {
104 int ret = 0;
105
106 switch (state) {
107 case PM_SUSPEND_MEM:
108 davinci_pm_suspend();
109 break;
110 default:
111 ret = -EINVAL;
112 }
113
114 return ret;
115 }
116
117 static const struct platform_suspend_ops davinci_pm_ops = {
118 .enter = davinci_pm_enter,
119 .valid = suspend_valid_only_mem,
120 };
121
davinci_pm_init(void)122 int __init davinci_pm_init(void)
123 {
124 int ret;
125
126 ret = davinci_cfg_reg(DA850_RTC_ALARM);
127 if (ret)
128 return ret;
129
130 pm_config.ddr2_ctlr_base = da8xx_get_mem_ctlr();
131 pm_config.deepsleep_reg = DA8XX_SYSCFG1_VIRT(DA8XX_DEEPSLEEP_REG);
132
133 pm_config.cpupll_reg_base = ioremap(DA8XX_PLL0_BASE, SZ_4K);
134 if (!pm_config.cpupll_reg_base)
135 return -ENOMEM;
136
137 pm_config.ddrpll_reg_base = ioremap(DA850_PLL1_BASE, SZ_4K);
138 if (!pm_config.ddrpll_reg_base) {
139 ret = -ENOMEM;
140 goto no_ddrpll_mem;
141 }
142
143 pm_config.ddrpsc_reg_base = ioremap(DA8XX_PSC1_BASE, SZ_4K);
144 if (!pm_config.ddrpsc_reg_base) {
145 ret = -ENOMEM;
146 goto no_ddrpsc_mem;
147 }
148
149 davinci_sram_suspend = sram_alloc(davinci_cpu_suspend_sz, NULL);
150 if (!davinci_sram_suspend) {
151 pr_err("PM: cannot allocate SRAM memory\n");
152 ret = -ENOMEM;
153 goto no_sram_mem;
154 }
155
156 davinci_sram_push(davinci_sram_suspend, davinci_cpu_suspend,
157 davinci_cpu_suspend_sz);
158
159 suspend_set_ops(&davinci_pm_ops);
160
161 return 0;
162
163 no_sram_mem:
164 iounmap(pm_config.ddrpsc_reg_base);
165 no_ddrpsc_mem:
166 iounmap(pm_config.ddrpll_reg_base);
167 no_ddrpll_mem:
168 iounmap(pm_config.cpupll_reg_base);
169 return ret;
170 }
171