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b2b35e10 V |
1 | /* |
2 | * AppliedMicro X-Gene SoC GPIO-Standby Driver | |
3 | * | |
4 | * Copyright (c) 2014, Applied Micro Circuits Corporation | |
5 | * Author: Tin Huynh <tnhuynh@apm.com>. | |
6 | * Y Vo <yvo@apm.com>. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/io.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/of_gpio.h> | |
26 | #include <linux/gpio.h> | |
27 | #include <linux/gpio/driver.h> | |
733cf014 | 28 | #include <linux/acpi.h> |
b2b35e10 V |
29 | #include <linux/basic_mmio_gpio.h> |
30 | ||
733cf014 V |
31 | #include "gpiolib.h" |
32 | ||
b2b35e10 V |
33 | #define XGENE_MAX_GPIO_DS 22 |
34 | #define XGENE_MAX_GPIO_DS_IRQ 6 | |
35 | ||
36 | #define GPIO_MASK(x) (1U << ((x) % 32)) | |
37 | ||
38 | #define MPA_GPIO_INT_LVL 0x0290 | |
39 | #define MPA_GPIO_OE_ADDR 0x029c | |
40 | #define MPA_GPIO_OUT_ADDR 0x02a0 | |
41 | #define MPA_GPIO_IN_ADDR 0x02a4 | |
42 | #define MPA_GPIO_SEL_LO 0x0294 | |
43 | ||
44 | /** | |
45 | * struct xgene_gpio_sb - GPIO-Standby private data structure. | |
46 | * @bgc: memory-mapped GPIO controllers. | |
47 | * @irq: Mapping GPIO pins and interrupt number | |
48 | * nirq: Number of GPIO pins that supports interrupt | |
49 | */ | |
50 | struct xgene_gpio_sb { | |
51 | struct bgpio_chip bgc; | |
52 | u32 *irq; | |
53 | u32 nirq; | |
54 | }; | |
55 | ||
56 | static inline struct xgene_gpio_sb *to_xgene_gpio_sb(struct gpio_chip *gc) | |
57 | { | |
58 | struct bgpio_chip *bgc = to_bgpio_chip(gc); | |
59 | ||
60 | return container_of(bgc, struct xgene_gpio_sb, bgc); | |
61 | } | |
62 | ||
63 | static void xgene_gpio_set_bit(struct bgpio_chip *bgc, void __iomem *reg, u32 gpio, int val) | |
64 | { | |
65 | u32 data; | |
66 | ||
67 | data = bgc->read_reg(reg); | |
68 | if (val) | |
69 | data |= GPIO_MASK(gpio); | |
70 | else | |
71 | data &= ~GPIO_MASK(gpio); | |
72 | bgc->write_reg(reg, data); | |
73 | } | |
74 | ||
75 | static int apm_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio) | |
76 | { | |
77 | struct xgene_gpio_sb *priv = to_xgene_gpio_sb(gc); | |
78 | ||
79 | if (priv->irq[gpio]) | |
80 | return priv->irq[gpio]; | |
81 | ||
82 | return -ENXIO; | |
83 | } | |
84 | ||
85 | static int xgene_gpio_sb_probe(struct platform_device *pdev) | |
86 | { | |
87 | struct xgene_gpio_sb *priv; | |
88 | u32 ret, i; | |
89 | u32 default_lines[] = {0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D}; | |
90 | struct resource *res; | |
91 | void __iomem *regs; | |
92 | ||
93 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); | |
94 | if (!priv) | |
95 | return -ENOMEM; | |
96 | ||
97 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
98 | regs = devm_ioremap_resource(&pdev->dev, res); | |
33c07b46 | 99 | if (IS_ERR(regs)) |
b2b35e10 V |
100 | return PTR_ERR(regs); |
101 | ||
102 | ret = bgpio_init(&priv->bgc, &pdev->dev, 4, | |
103 | regs + MPA_GPIO_IN_ADDR, | |
104 | regs + MPA_GPIO_OUT_ADDR, NULL, | |
105 | regs + MPA_GPIO_OE_ADDR, NULL, 0); | |
106 | if (ret) | |
107 | return ret; | |
108 | ||
109 | priv->bgc.gc.to_irq = apm_gpio_sb_to_irq; | |
110 | priv->bgc.gc.ngpio = XGENE_MAX_GPIO_DS; | |
111 | ||
112 | priv->nirq = XGENE_MAX_GPIO_DS_IRQ; | |
113 | ||
114 | priv->irq = devm_kzalloc(&pdev->dev, sizeof(u32) * XGENE_MAX_GPIO_DS, | |
115 | GFP_KERNEL); | |
116 | if (!priv->irq) | |
117 | return -ENOMEM; | |
b2b35e10 V |
118 | |
119 | for (i = 0; i < priv->nirq; i++) { | |
120 | priv->irq[default_lines[i]] = platform_get_irq(pdev, i); | |
121 | xgene_gpio_set_bit(&priv->bgc, regs + MPA_GPIO_SEL_LO, | |
122 | default_lines[i] * 2, 1); | |
123 | xgene_gpio_set_bit(&priv->bgc, regs + MPA_GPIO_INT_LVL, i, 1); | |
124 | } | |
125 | ||
126 | platform_set_drvdata(pdev, priv); | |
127 | ||
128 | ret = gpiochip_add(&priv->bgc.gc); | |
129 | if (ret) | |
130 | dev_err(&pdev->dev, "failed to register X-Gene GPIO Standby driver\n"); | |
131 | else | |
132 | dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n"); | |
133 | ||
733cf014 V |
134 | if (priv->nirq > 0) { |
135 | /* Register interrupt handlers for gpio signaled acpi events */ | |
136 | acpi_gpiochip_request_interrupts(&priv->bgc.gc); | |
137 | } | |
138 | ||
b2b35e10 V |
139 | return ret; |
140 | } | |
141 | ||
142 | static int xgene_gpio_sb_remove(struct platform_device *pdev) | |
143 | { | |
144 | struct xgene_gpio_sb *priv = platform_get_drvdata(pdev); | |
145 | ||
733cf014 V |
146 | if (priv->nirq > 0) { |
147 | acpi_gpiochip_free_interrupts(&priv->bgc.gc); | |
148 | } | |
149 | ||
b2b35e10 V |
150 | return bgpio_remove(&priv->bgc); |
151 | } | |
152 | ||
153 | static const struct of_device_id xgene_gpio_sb_of_match[] = { | |
154 | {.compatible = "apm,xgene-gpio-sb", }, | |
155 | {}, | |
156 | }; | |
157 | MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match); | |
158 | ||
733cf014 V |
159 | #ifdef CONFIG_ACPI |
160 | static const struct acpi_device_id xgene_gpio_sb_acpi_match[] = { | |
161 | {"APMC0D15", 0}, | |
162 | {}, | |
163 | }; | |
164 | MODULE_DEVICE_TABLE(acpi, xgene_gpio_sb_acpi_match); | |
165 | #endif | |
166 | ||
b2b35e10 V |
167 | static struct platform_driver xgene_gpio_sb_driver = { |
168 | .driver = { | |
169 | .name = "xgene-gpio-sb", | |
170 | .of_match_table = xgene_gpio_sb_of_match, | |
733cf014 | 171 | .acpi_match_table = ACPI_PTR(xgene_gpio_sb_acpi_match), |
b2b35e10 V |
172 | }, |
173 | .probe = xgene_gpio_sb_probe, | |
174 | .remove = xgene_gpio_sb_remove, | |
175 | }; | |
176 | module_platform_driver(xgene_gpio_sb_driver); | |
177 | ||
178 | MODULE_AUTHOR("AppliedMicro"); | |
179 | MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver"); | |
180 | MODULE_LICENSE("GPL"); |