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
|
This commit adds the implementation of ->suspend() and ->resume()
platform_driver hooks in order to save and restore the state of the
GPIO configuration. In order to achieve that, additional fields are
added to the mvebu_gpio_chip structure.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -83,6 +83,14 @@ struct mvebu_gpio_chip {
int irqbase;
struct irq_domain *domain;
int soc_variant;
+
+ /* Used to preserve GPIO registers accross suspend/resume */
+ u32 out_reg;
+ u32 io_conf_reg;
+ u32 blink_en_reg;
+ u32 in_pol_reg;
+ u32 edge_mask_regs[4];
+ u32 level_mask_regs[4];
};
/*
@@ -554,6 +562,93 @@ static const struct of_device_id mvebu_g
};
MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
+static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
+ int i;
+
+ mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
+ mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
+ mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
+ mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ mvchip->edge_mask_regs[0] =
+ readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
+ mvchip->level_mask_regs[0] =
+ readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ for (i = 0; i < 2; i++) {
+ mvchip->edge_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_EDGE_MASK_MV78200_OFF(i));
+ mvchip->level_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_LEVEL_MASK_MV78200_OFF(i));
+ }
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ for (i = 0; i < 4; i++) {
+ mvchip->edge_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_EDGE_MASK_ARMADAXP_OFF(i));
+ mvchip->level_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
+ }
+ break;
+ default:
+ BUG();
+ }
+
+ return 0;
+}
+
+static int mvebu_gpio_resume(struct platform_device *pdev)
+{
+ struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
+ int i;
+
+ writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
+ writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
+ writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
+ writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ writel(mvchip->edge_mask_regs[0],
+ mvchip->membase + GPIO_EDGE_MASK_OFF);
+ writel(mvchip->level_mask_regs[0],
+ mvchip->membase + GPIO_LEVEL_MASK_OFF);
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ for (i = 0; i < 2; i++) {
+ writel(mvchip->edge_mask_regs[i],
+ mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
+ writel(mvchip->level_mask_regs[i],
+ mvchip->membase +
+ GPIO_LEVEL_MASK_MV78200_OFF(i));
+ }
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ for (i = 0; i < 4; i++) {
+ writel(mvchip->edge_mask_regs[i],
+ mvchip->membase +
+ GPIO_EDGE_MASK_ARMADAXP_OFF(i));
+ writel(mvchip->level_mask_regs[i],
+ mvchip->membase +
+ GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
+ }
+ break;
+ default:
+ BUG();
+ }
+
+ return 0;
+}
+
static int mvebu_gpio_probe(struct platform_device *pdev)
{
struct mvebu_gpio_chip *mvchip;
@@ -577,6 +672,8 @@ static int mvebu_gpio_probe(struct platf
if (!mvchip)
return -ENOMEM;
+ platform_set_drvdata(pdev, mvchip);
+
if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
dev_err(&pdev->dev, "Missing ngpios OF property\n");
return -ENODEV;
@@ -735,5 +832,7 @@ static struct platform_driver mvebu_gpio
.of_match_table = mvebu_gpio_of_match,
},
.probe = mvebu_gpio_probe,
+ .suspend = mvebu_gpio_suspend,
+ .resume = mvebu_gpio_resume,
};
module_platform_driver(mvebu_gpio_driver);
|
