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1 | /* |
2 | * RDC321x GPIO driver | |
3 | * | |
4 | * Copyright (C) 2008, Volker Weiss <dev@tintuc.de> | |
5 | * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | * | |
21 | */ | |
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/pci.h> | |
28 | #include <linux/gpio.h> | |
29 | #include <linux/mfd/rdc321x.h> | |
374b72ec | 30 | #include <linux/slab.h> |
9956d02d FF |
31 | |
32 | struct rdc321x_gpio { | |
33 | spinlock_t lock; | |
34 | struct pci_dev *sb_pdev; | |
35 | u32 data_reg[2]; | |
36 | int reg1_ctrl_base; | |
37 | int reg1_data_base; | |
38 | int reg2_ctrl_base; | |
39 | int reg2_data_base; | |
40 | struct gpio_chip chip; | |
41 | }; | |
42 | ||
43 | /* read GPIO pin */ | |
44 | static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
45 | { | |
46 | struct rdc321x_gpio *gpch; | |
47 | u32 value = 0; | |
48 | int reg; | |
49 | ||
50 | gpch = container_of(chip, struct rdc321x_gpio, chip); | |
51 | reg = gpio < 32 ? gpch->reg1_data_base : gpch->reg2_data_base; | |
52 | ||
53 | spin_lock(&gpch->lock); | |
54 | pci_write_config_dword(gpch->sb_pdev, reg, | |
55 | gpch->data_reg[gpio < 32 ? 0 : 1]); | |
56 | pci_read_config_dword(gpch->sb_pdev, reg, &value); | |
57 | spin_unlock(&gpch->lock); | |
58 | ||
59 | return (1 << (gpio & 0x1f)) & value ? 1 : 0; | |
60 | } | |
61 | ||
62 | static void rdc_gpio_set_value_impl(struct gpio_chip *chip, | |
63 | unsigned gpio, int value) | |
64 | { | |
65 | struct rdc321x_gpio *gpch; | |
66 | int reg = (gpio < 32) ? 0 : 1; | |
67 | ||
68 | gpch = container_of(chip, struct rdc321x_gpio, chip); | |
69 | ||
70 | if (value) | |
71 | gpch->data_reg[reg] |= 1 << (gpio & 0x1f); | |
72 | else | |
73 | gpch->data_reg[reg] &= ~(1 << (gpio & 0x1f)); | |
74 | ||
75 | pci_write_config_dword(gpch->sb_pdev, | |
75907a11 | 76 | reg ? gpch->reg2_data_base : gpch->reg1_data_base, |
9956d02d FF |
77 | gpch->data_reg[reg]); |
78 | } | |
79 | ||
80 | /* set GPIO pin to value */ | |
81 | static void rdc_gpio_set_value(struct gpio_chip *chip, | |
82 | unsigned gpio, int value) | |
83 | { | |
84 | struct rdc321x_gpio *gpch; | |
85 | ||
86 | gpch = container_of(chip, struct rdc321x_gpio, chip); | |
87 | spin_lock(&gpch->lock); | |
88 | rdc_gpio_set_value_impl(chip, gpio, value); | |
89 | spin_unlock(&gpch->lock); | |
90 | } | |
91 | ||
92 | static int rdc_gpio_config(struct gpio_chip *chip, | |
93 | unsigned gpio, int value) | |
94 | { | |
95 | struct rdc321x_gpio *gpch; | |
96 | int err; | |
97 | u32 reg; | |
98 | ||
99 | gpch = container_of(chip, struct rdc321x_gpio, chip); | |
100 | ||
101 | spin_lock(&gpch->lock); | |
102 | err = pci_read_config_dword(gpch->sb_pdev, gpio < 32 ? | |
103 | gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, ®); | |
104 | if (err) | |
105 | goto unlock; | |
106 | ||
107 | reg |= 1 << (gpio & 0x1f); | |
108 | ||
109 | err = pci_write_config_dword(gpch->sb_pdev, gpio < 32 ? | |
110 | gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, reg); | |
111 | if (err) | |
112 | goto unlock; | |
113 | ||
114 | rdc_gpio_set_value_impl(chip, gpio, value); | |
115 | ||
116 | unlock: | |
117 | spin_unlock(&gpch->lock); | |
118 | ||
119 | return err; | |
120 | } | |
121 | ||
122 | /* configure GPIO pin as input */ | |
123 | static int rdc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) | |
124 | { | |
125 | return rdc_gpio_config(chip, gpio, 1); | |
126 | } | |
127 | ||
128 | /* | |
129 | * Cache the initial value of both GPIO data registers | |
130 | */ | |
3836309d | 131 | static int rdc321x_gpio_probe(struct platform_device *pdev) |
9956d02d FF |
132 | { |
133 | int err; | |
134 | struct resource *r; | |
135 | struct rdc321x_gpio *rdc321x_gpio_dev; | |
136 | struct rdc321x_gpio_pdata *pdata; | |
137 | ||
e56aee18 | 138 | pdata = dev_get_platdata(&pdev->dev); |
9956d02d FF |
139 | if (!pdata) { |
140 | dev_err(&pdev->dev, "no platform data supplied\n"); | |
141 | return -ENODEV; | |
142 | } | |
143 | ||
144 | rdc321x_gpio_dev = kzalloc(sizeof(struct rdc321x_gpio), GFP_KERNEL); | |
145 | if (!rdc321x_gpio_dev) { | |
146 | dev_err(&pdev->dev, "failed to allocate private data\n"); | |
147 | return -ENOMEM; | |
148 | } | |
149 | ||
8deca39e | 150 | r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg1"); |
9956d02d FF |
151 | if (!r) { |
152 | dev_err(&pdev->dev, "failed to get gpio-reg1 resource\n"); | |
153 | err = -ENODEV; | |
154 | goto out_free; | |
155 | } | |
156 | ||
157 | spin_lock_init(&rdc321x_gpio_dev->lock); | |
158 | rdc321x_gpio_dev->sb_pdev = pdata->sb_pdev; | |
159 | rdc321x_gpio_dev->reg1_ctrl_base = r->start; | |
160 | rdc321x_gpio_dev->reg1_data_base = r->start + 0x4; | |
161 | ||
8deca39e | 162 | r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg2"); |
9956d02d FF |
163 | if (!r) { |
164 | dev_err(&pdev->dev, "failed to get gpio-reg2 resource\n"); | |
165 | err = -ENODEV; | |
166 | goto out_free; | |
167 | } | |
168 | ||
169 | rdc321x_gpio_dev->reg2_ctrl_base = r->start; | |
170 | rdc321x_gpio_dev->reg2_data_base = r->start + 0x4; | |
171 | ||
172 | rdc321x_gpio_dev->chip.label = "rdc321x-gpio"; | |
1146f882 | 173 | rdc321x_gpio_dev->chip.owner = THIS_MODULE; |
9956d02d FF |
174 | rdc321x_gpio_dev->chip.direction_input = rdc_gpio_direction_input; |
175 | rdc321x_gpio_dev->chip.direction_output = rdc_gpio_config; | |
176 | rdc321x_gpio_dev->chip.get = rdc_gpio_get_value; | |
177 | rdc321x_gpio_dev->chip.set = rdc_gpio_set_value; | |
178 | rdc321x_gpio_dev->chip.base = 0; | |
179 | rdc321x_gpio_dev->chip.ngpio = pdata->max_gpios; | |
180 | ||
181 | platform_set_drvdata(pdev, rdc321x_gpio_dev); | |
182 | ||
183 | /* This might not be, what others (BIOS, bootloader, etc.) | |
184 | wrote to these registers before, but it's a good guess. Still | |
185 | better than just using 0xffffffff. */ | |
186 | err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev, | |
187 | rdc321x_gpio_dev->reg1_data_base, | |
188 | &rdc321x_gpio_dev->data_reg[0]); | |
189 | if (err) | |
8be2010e | 190 | goto out_free; |
9956d02d FF |
191 | |
192 | err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev, | |
193 | rdc321x_gpio_dev->reg2_data_base, | |
194 | &rdc321x_gpio_dev->data_reg[1]); | |
195 | if (err) | |
8be2010e | 196 | goto out_free; |
9956d02d FF |
197 | |
198 | dev_info(&pdev->dev, "registering %d GPIOs\n", | |
199 | rdc321x_gpio_dev->chip.ngpio); | |
200 | return gpiochip_add(&rdc321x_gpio_dev->chip); | |
201 | ||
9956d02d FF |
202 | out_free: |
203 | kfree(rdc321x_gpio_dev); | |
204 | return err; | |
205 | } | |
206 | ||
206210ce | 207 | static int rdc321x_gpio_remove(struct platform_device *pdev) |
9956d02d FF |
208 | { |
209 | int ret; | |
210 | struct rdc321x_gpio *rdc321x_gpio_dev = platform_get_drvdata(pdev); | |
211 | ||
212 | ret = gpiochip_remove(&rdc321x_gpio_dev->chip); | |
213 | if (ret) | |
214 | dev_err(&pdev->dev, "failed to unregister chip\n"); | |
215 | ||
216 | kfree(rdc321x_gpio_dev); | |
9956d02d FF |
217 | |
218 | return ret; | |
219 | } | |
220 | ||
221 | static struct platform_driver rdc321x_gpio_driver = { | |
222 | .driver.name = "rdc321x-gpio", | |
223 | .driver.owner = THIS_MODULE, | |
224 | .probe = rdc321x_gpio_probe, | |
8283c4ff | 225 | .remove = rdc321x_gpio_remove, |
9956d02d FF |
226 | }; |
227 | ||
6f61415e | 228 | module_platform_driver(rdc321x_gpio_driver); |
9956d02d FF |
229 | |
230 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
231 | MODULE_DESCRIPTION("RDC321x GPIO driver"); | |
232 | MODULE_LICENSE("GPL"); | |
233 | MODULE_ALIAS("platform:rdc321x-gpio"); |