kernel: update 3.18 to 3.18.14
[openwrt/svn-archive/archive.git] / target / linux / mvebu / patches-3.18 / 198-gpio_mvebu_suspend.patch
1 This commit adds the implementation of ->suspend() and ->resume()
2 platform_driver hooks in order to save and restore the state of the
3 GPIO configuration. In order to achieve that, additional fields are
4 added to the mvebu_gpio_chip structure.
5
6 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
7 Acked-by: Alexandre Courbot <acourbot@nvidia.com>
8 Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
9
10 --- a/drivers/gpio/gpio-mvebu.c
11 +++ b/drivers/gpio/gpio-mvebu.c
12 @@ -83,6 +83,14 @@ struct mvebu_gpio_chip {
13 int irqbase;
14 struct irq_domain *domain;
15 int soc_variant;
16 +
17 + /* Used to preserve GPIO registers accross suspend/resume */
18 + u32 out_reg;
19 + u32 io_conf_reg;
20 + u32 blink_en_reg;
21 + u32 in_pol_reg;
22 + u32 edge_mask_regs[4];
23 + u32 level_mask_regs[4];
24 };
25
26 /*
27 @@ -562,6 +570,93 @@ static const struct of_device_id mvebu_g
28 };
29 MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
30
31 +static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
32 +{
33 + struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
34 + int i;
35 +
36 + mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
37 + mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
38 + mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
39 + mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
40 +
41 + switch (mvchip->soc_variant) {
42 + case MVEBU_GPIO_SOC_VARIANT_ORION:
43 + mvchip->edge_mask_regs[0] =
44 + readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
45 + mvchip->level_mask_regs[0] =
46 + readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
47 + break;
48 + case MVEBU_GPIO_SOC_VARIANT_MV78200:
49 + for (i = 0; i < 2; i++) {
50 + mvchip->edge_mask_regs[i] =
51 + readl(mvchip->membase +
52 + GPIO_EDGE_MASK_MV78200_OFF(i));
53 + mvchip->level_mask_regs[i] =
54 + readl(mvchip->membase +
55 + GPIO_LEVEL_MASK_MV78200_OFF(i));
56 + }
57 + break;
58 + case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
59 + for (i = 0; i < 4; i++) {
60 + mvchip->edge_mask_regs[i] =
61 + readl(mvchip->membase +
62 + GPIO_EDGE_MASK_ARMADAXP_OFF(i));
63 + mvchip->level_mask_regs[i] =
64 + readl(mvchip->membase +
65 + GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
66 + }
67 + break;
68 + default:
69 + BUG();
70 + }
71 +
72 + return 0;
73 +}
74 +
75 +static int mvebu_gpio_resume(struct platform_device *pdev)
76 +{
77 + struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
78 + int i;
79 +
80 + writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
81 + writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
82 + writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
83 + writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
84 +
85 + switch (mvchip->soc_variant) {
86 + case MVEBU_GPIO_SOC_VARIANT_ORION:
87 + writel(mvchip->edge_mask_regs[0],
88 + mvchip->membase + GPIO_EDGE_MASK_OFF);
89 + writel(mvchip->level_mask_regs[0],
90 + mvchip->membase + GPIO_LEVEL_MASK_OFF);
91 + break;
92 + case MVEBU_GPIO_SOC_VARIANT_MV78200:
93 + for (i = 0; i < 2; i++) {
94 + writel(mvchip->edge_mask_regs[i],
95 + mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
96 + writel(mvchip->level_mask_regs[i],
97 + mvchip->membase +
98 + GPIO_LEVEL_MASK_MV78200_OFF(i));
99 + }
100 + break;
101 + case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
102 + for (i = 0; i < 4; i++) {
103 + writel(mvchip->edge_mask_regs[i],
104 + mvchip->membase +
105 + GPIO_EDGE_MASK_ARMADAXP_OFF(i));
106 + writel(mvchip->level_mask_regs[i],
107 + mvchip->membase +
108 + GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
109 + }
110 + break;
111 + default:
112 + BUG();
113 + }
114 +
115 + return 0;
116 +}
117 +
118 static int mvebu_gpio_probe(struct platform_device *pdev)
119 {
120 struct mvebu_gpio_chip *mvchip;
121 @@ -585,6 +680,8 @@ static int mvebu_gpio_probe(struct platf
122 if (!mvchip)
123 return -ENOMEM;
124
125 + platform_set_drvdata(pdev, mvchip);
126 +
127 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
128 dev_err(&pdev->dev, "Missing ngpios OF property\n");
129 return -ENODEV;
130 @@ -743,5 +840,7 @@ static struct platform_driver mvebu_gpio
131 .of_match_table = mvebu_gpio_of_match,
132 },
133 .probe = mvebu_gpio_probe,
134 + .suspend = mvebu_gpio_suspend,
135 + .resume = mvebu_gpio_resume,
136 };
137 module_platform_driver(mvebu_gpio_driver);