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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> | |
46673ed2 | 30 | #include <linux/mfd/core.h> |
374b72ec | 31 | #include <linux/slab.h> |
9956d02d FF |
32 | |
33 | struct rdc321x_gpio { | |
34 | spinlock_t lock; | |
35 | struct pci_dev *sb_pdev; | |
36 | u32 data_reg[2]; | |
37 | int reg1_ctrl_base; | |
38 | int reg1_data_base; | |
39 | int reg2_ctrl_base; | |
40 | int reg2_data_base; | |
41 | struct gpio_chip chip; | |
42 | }; | |
43 | ||
44 | /* read GPIO pin */ | |
45 | static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
46 | { | |
47 | struct rdc321x_gpio *gpch; | |
48 | u32 value = 0; | |
49 | int reg; | |
50 | ||
51 | gpch = container_of(chip, struct rdc321x_gpio, chip); | |
52 | reg = gpio < 32 ? gpch->reg1_data_base : gpch->reg2_data_base; | |
53 | ||
54 | spin_lock(&gpch->lock); | |
55 | pci_write_config_dword(gpch->sb_pdev, reg, | |
56 | gpch->data_reg[gpio < 32 ? 0 : 1]); | |
57 | pci_read_config_dword(gpch->sb_pdev, reg, &value); | |
58 | spin_unlock(&gpch->lock); | |
59 | ||
60 | return (1 << (gpio & 0x1f)) & value ? 1 : 0; | |
61 | } | |
62 | ||
63 | static void rdc_gpio_set_value_impl(struct gpio_chip *chip, | |
64 | unsigned gpio, int value) | |
65 | { | |
66 | struct rdc321x_gpio *gpch; | |
67 | int reg = (gpio < 32) ? 0 : 1; | |
68 | ||
69 | gpch = container_of(chip, struct rdc321x_gpio, chip); | |
70 | ||
71 | if (value) | |
72 | gpch->data_reg[reg] |= 1 << (gpio & 0x1f); | |
73 | else | |
74 | gpch->data_reg[reg] &= ~(1 << (gpio & 0x1f)); | |
75 | ||
76 | pci_write_config_dword(gpch->sb_pdev, | |
75907a11 | 77 | reg ? gpch->reg2_data_base : gpch->reg1_data_base, |
9956d02d FF |
78 | gpch->data_reg[reg]); |
79 | } | |
80 | ||
81 | /* set GPIO pin to value */ | |
82 | static void rdc_gpio_set_value(struct gpio_chip *chip, | |
83 | unsigned gpio, int value) | |
84 | { | |
85 | struct rdc321x_gpio *gpch; | |
86 | ||
87 | gpch = container_of(chip, struct rdc321x_gpio, chip); | |
88 | spin_lock(&gpch->lock); | |
89 | rdc_gpio_set_value_impl(chip, gpio, value); | |
90 | spin_unlock(&gpch->lock); | |
91 | } | |
92 | ||
93 | static int rdc_gpio_config(struct gpio_chip *chip, | |
94 | unsigned gpio, int value) | |
95 | { | |
96 | struct rdc321x_gpio *gpch; | |
97 | int err; | |
98 | u32 reg; | |
99 | ||
100 | gpch = container_of(chip, struct rdc321x_gpio, chip); | |
101 | ||
102 | spin_lock(&gpch->lock); | |
103 | err = pci_read_config_dword(gpch->sb_pdev, gpio < 32 ? | |
104 | gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, ®); | |
105 | if (err) | |
106 | goto unlock; | |
107 | ||
108 | reg |= 1 << (gpio & 0x1f); | |
109 | ||
110 | err = pci_write_config_dword(gpch->sb_pdev, gpio < 32 ? | |
111 | gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, reg); | |
112 | if (err) | |
113 | goto unlock; | |
114 | ||
115 | rdc_gpio_set_value_impl(chip, gpio, value); | |
116 | ||
117 | unlock: | |
118 | spin_unlock(&gpch->lock); | |
119 | ||
120 | return err; | |
121 | } | |
122 | ||
123 | /* configure GPIO pin as input */ | |
124 | static int rdc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) | |
125 | { | |
126 | return rdc_gpio_config(chip, gpio, 1); | |
127 | } | |
128 | ||
129 | /* | |
130 | * Cache the initial value of both GPIO data registers | |
131 | */ | |
132 | static int __devinit rdc321x_gpio_probe(struct platform_device *pdev) | |
133 | { | |
134 | int err; | |
135 | struct resource *r; | |
136 | struct rdc321x_gpio *rdc321x_gpio_dev; | |
137 | struct rdc321x_gpio_pdata *pdata; | |
138 | ||
46673ed2 | 139 | pdata = mfd_get_data(pdev); |
9956d02d FF |
140 | if (!pdata) { |
141 | dev_err(&pdev->dev, "no platform data supplied\n"); | |
142 | return -ENODEV; | |
143 | } | |
144 | ||
145 | rdc321x_gpio_dev = kzalloc(sizeof(struct rdc321x_gpio), GFP_KERNEL); | |
146 | if (!rdc321x_gpio_dev) { | |
147 | dev_err(&pdev->dev, "failed to allocate private data\n"); | |
148 | return -ENOMEM; | |
149 | } | |
150 | ||
8deca39e | 151 | r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg1"); |
9956d02d FF |
152 | if (!r) { |
153 | dev_err(&pdev->dev, "failed to get gpio-reg1 resource\n"); | |
154 | err = -ENODEV; | |
155 | goto out_free; | |
156 | } | |
157 | ||
158 | spin_lock_init(&rdc321x_gpio_dev->lock); | |
159 | rdc321x_gpio_dev->sb_pdev = pdata->sb_pdev; | |
160 | rdc321x_gpio_dev->reg1_ctrl_base = r->start; | |
161 | rdc321x_gpio_dev->reg1_data_base = r->start + 0x4; | |
162 | ||
8deca39e | 163 | r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg2"); |
9956d02d FF |
164 | if (!r) { |
165 | dev_err(&pdev->dev, "failed to get gpio-reg2 resource\n"); | |
166 | err = -ENODEV; | |
167 | goto out_free; | |
168 | } | |
169 | ||
170 | rdc321x_gpio_dev->reg2_ctrl_base = r->start; | |
171 | rdc321x_gpio_dev->reg2_data_base = r->start + 0x4; | |
172 | ||
173 | rdc321x_gpio_dev->chip.label = "rdc321x-gpio"; | |
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) | |
190 | goto out_drvdata; | |
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) | |
196 | goto out_drvdata; | |
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 | ||
202 | out_drvdata: | |
203 | platform_set_drvdata(pdev, NULL); | |
204 | out_free: | |
205 | kfree(rdc321x_gpio_dev); | |
206 | return err; | |
207 | } | |
208 | ||
209 | static int __devexit rdc321x_gpio_remove(struct platform_device *pdev) | |
210 | { | |
211 | int ret; | |
212 | struct rdc321x_gpio *rdc321x_gpio_dev = platform_get_drvdata(pdev); | |
213 | ||
214 | ret = gpiochip_remove(&rdc321x_gpio_dev->chip); | |
215 | if (ret) | |
216 | dev_err(&pdev->dev, "failed to unregister chip\n"); | |
217 | ||
218 | kfree(rdc321x_gpio_dev); | |
219 | platform_set_drvdata(pdev, NULL); | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
224 | static struct platform_driver rdc321x_gpio_driver = { | |
225 | .driver.name = "rdc321x-gpio", | |
226 | .driver.owner = THIS_MODULE, | |
227 | .probe = rdc321x_gpio_probe, | |
228 | .remove = __devexit_p(rdc321x_gpio_remove), | |
229 | }; | |
230 | ||
231 | static int __init rdc321x_gpio_init(void) | |
232 | { | |
233 | return platform_driver_register(&rdc321x_gpio_driver); | |
234 | } | |
235 | ||
236 | static void __exit rdc321x_gpio_exit(void) | |
237 | { | |
238 | platform_driver_unregister(&rdc321x_gpio_driver); | |
239 | } | |
240 | ||
241 | module_init(rdc321x_gpio_init); | |
242 | module_exit(rdc321x_gpio_exit); | |
243 | ||
244 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
245 | MODULE_DESCRIPTION("RDC321x GPIO driver"); | |
246 | MODULE_LICENSE("GPL"); | |
247 | MODULE_ALIAS("platform:rdc321x-gpio"); |