1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* arch/arm/mach-socfpga/pm.c
*
* Copyright (C) 2014-2015 Altera Corporation. All rights reserved.
*
* with code from pm-imx6.c
* Copyright 2011-2014 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*/
#include <linux/bitops.h>
#include <linux/genalloc.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/suspend.h>
#include <asm/suspend.h>
#include <asm/fncpy.h>
#include "core.h"
/* Pointer to function copied to ocram */
static u32 (*socfpga_sdram_self_refresh_in_ocram)(u32 sdr_base);
static int socfpga_setup_ocram_self_refresh(void)
{
struct platform_device *pdev;
phys_addr_t ocram_pbase;
struct device_node *np;
struct gen_pool *ocram_pool;
unsigned long ocram_base;
void __iomem *suspend_ocram_base;
int ret = 0;
np = of_find_compatible_node(NULL, NULL, "mmio-sram");
if (!np) {
pr_err("%s: Unable to find mmio-sram in dtb\n", __func__);
return -ENODEV;
}
pdev = of_find_device_by_node(np);
if (!pdev) {
pr_warn("%s: failed to find ocram device!\n", __func__);
ret = -ENODEV;
goto put_node;
}
ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
goto put_device;
}
ocram_base = gen_pool_alloc(ocram_pool, socfpga_sdram_self_refresh_sz);
if (!ocram_base) {
pr_warn("%s: unable to alloc ocram!\n", __func__);
ret = -ENOMEM;
goto put_device;
}
ocram_pbase = gen_pool_virt_to_phys(ocram_pool, ocram_base);
suspend_ocram_base = __arm_ioremap_exec(ocram_pbase,
socfpga_sdram_self_refresh_sz,
false);
if (!suspend_ocram_base) {
pr_warn("%s: __arm_ioremap_exec failed!\n", __func__);
ret = -ENOMEM;
goto put_device;
}
/* Copy the code that puts DDR in self refresh to ocram */
socfpga_sdram_self_refresh_in_ocram =
(void *)fncpy(suspend_ocram_base,
&socfpga_sdram_self_refresh,
socfpga_sdram_self_refresh_sz);
WARN(!socfpga_sdram_self_refresh_in_ocram,
"could not copy function to ocram");
if (!socfpga_sdram_self_refresh_in_ocram)
ret = -EFAULT;
put_device:
put_device(&pdev->dev);
put_node:
of_node_put(np);
return ret;
}
static int socfpga_pm_suspend(unsigned long arg)
{
u32 ret;
if (!sdr_ctl_base_addr)
return -EFAULT;
ret = socfpga_sdram_self_refresh_in_ocram((u32)sdr_ctl_base_addr);
pr_debug("%s self-refresh loops request=%d exit=%d\n", __func__,
ret & 0xffff, (ret >> 16) & 0xffff);
return 0;
}
static int socfpga_pm_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_MEM:
outer_disable();
cpu_suspend(0, socfpga_pm_suspend);
outer_resume();
break;
default:
return -EINVAL;
}
return 0;
}
static const struct platform_suspend_ops socfpga_pm_ops = {
.valid = suspend_valid_only_mem,
.enter = socfpga_pm_enter,
};
static int __init socfpga_pm_init(void)
{
int ret;
ret = socfpga_setup_ocram_self_refresh();
if (ret)
return ret;
suspend_set_ops(&socfpga_pm_ops);
pr_info("SoCFPGA initialized for DDR self-refresh during suspend.\n");
return 0;
}
arch_initcall(socfpga_pm_init);
|
