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1 | /* langwell_gpio.c Moorestown platform Langwell chip GPIO driver |
2 | * Copyright (c) 2008 - 2009, Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
16 | */ | |
17 | ||
18 | /* Supports: | |
19 | * Moorestown platform Langwell chip. | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/pci.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/stddef.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/irq.h> | |
30 | #include <linux/io.h> | |
31 | #include <linux/gpio.h> | |
32 | ||
33 | struct lnw_gpio_register { | |
34 | u32 GPLR[2]; | |
35 | u32 GPDR[2]; | |
36 | u32 GPSR[2]; | |
37 | u32 GPCR[2]; | |
38 | u32 GRER[2]; | |
39 | u32 GFER[2]; | |
40 | u32 GEDR[2]; | |
41 | }; | |
42 | ||
43 | struct lnw_gpio { | |
44 | struct gpio_chip chip; | |
45 | struct lnw_gpio_register *reg_base; | |
46 | spinlock_t lock; | |
47 | unsigned irq_base; | |
48 | }; | |
49 | ||
50 | static int lnw_gpio_get(struct gpio_chip *chip, unsigned offset) | |
51 | { | |
52 | struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); | |
53 | u8 reg = offset / 32; | |
54 | void __iomem *gplr; | |
55 | ||
56 | gplr = (void __iomem *)(&lnw->reg_base->GPLR[reg]); | |
57 | return readl(gplr) & BIT(offset % 32); | |
58 | } | |
59 | ||
60 | static void lnw_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
61 | { | |
62 | struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); | |
63 | u8 reg = offset / 32; | |
64 | void __iomem *gpsr, *gpcr; | |
65 | ||
66 | if (value) { | |
67 | gpsr = (void __iomem *)(&lnw->reg_base->GPSR[reg]); | |
68 | writel(BIT(offset % 32), gpsr); | |
69 | } else { | |
70 | gpcr = (void __iomem *)(&lnw->reg_base->GPCR[reg]); | |
71 | writel(BIT(offset % 32), gpcr); | |
72 | } | |
73 | } | |
74 | ||
75 | static int lnw_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
76 | { | |
77 | struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); | |
78 | u8 reg = offset / 32; | |
79 | u32 value; | |
80 | unsigned long flags; | |
81 | void __iomem *gpdr; | |
82 | ||
83 | gpdr = (void __iomem *)(&lnw->reg_base->GPDR[reg]); | |
84 | spin_lock_irqsave(&lnw->lock, flags); | |
85 | value = readl(gpdr); | |
86 | value &= ~BIT(offset % 32); | |
87 | writel(value, gpdr); | |
88 | spin_unlock_irqrestore(&lnw->lock, flags); | |
89 | return 0; | |
90 | } | |
91 | ||
92 | static int lnw_gpio_direction_output(struct gpio_chip *chip, | |
93 | unsigned offset, int value) | |
94 | { | |
95 | struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); | |
96 | u8 reg = offset / 32; | |
97 | unsigned long flags; | |
98 | void __iomem *gpdr; | |
99 | ||
100 | lnw_gpio_set(chip, offset, value); | |
101 | gpdr = (void __iomem *)(&lnw->reg_base->GPDR[reg]); | |
102 | spin_lock_irqsave(&lnw->lock, flags); | |
103 | value = readl(gpdr); | |
104 | value |= BIT(offset % 32);; | |
105 | writel(value, gpdr); | |
106 | spin_unlock_irqrestore(&lnw->lock, flags); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static int lnw_gpio_to_irq(struct gpio_chip *chip, unsigned offset) | |
111 | { | |
112 | struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); | |
113 | return lnw->irq_base + offset; | |
114 | } | |
115 | ||
116 | static int lnw_irq_type(unsigned irq, unsigned type) | |
117 | { | |
118 | struct lnw_gpio *lnw = get_irq_chip_data(irq); | |
119 | u32 gpio = irq - lnw->irq_base; | |
120 | u8 reg = gpio / 32; | |
121 | unsigned long flags; | |
122 | u32 value; | |
123 | void __iomem *grer = (void __iomem *)(&lnw->reg_base->GRER[reg]); | |
124 | void __iomem *gfer = (void __iomem *)(&lnw->reg_base->GFER[reg]); | |
125 | ||
126 | if (gpio < 0 || gpio > lnw->chip.ngpio) | |
127 | return -EINVAL; | |
128 | spin_lock_irqsave(&lnw->lock, flags); | |
129 | if (type & IRQ_TYPE_EDGE_RISING) | |
130 | value = readl(grer) | BIT(gpio % 32); | |
131 | else | |
132 | value = readl(grer) & (~BIT(gpio % 32)); | |
133 | writel(value, grer); | |
134 | ||
135 | if (type & IRQ_TYPE_EDGE_FALLING) | |
136 | value = readl(gfer) | BIT(gpio % 32); | |
137 | else | |
138 | value = readl(gfer) & (~BIT(gpio % 32)); | |
139 | writel(value, gfer); | |
140 | spin_unlock_irqrestore(&lnw->lock, flags); | |
141 | ||
142 | return 0; | |
143 | }; | |
144 | ||
145 | static void lnw_irq_unmask(unsigned irq) | |
146 | { | |
147 | struct lnw_gpio *lnw = get_irq_chip_data(irq); | |
148 | u32 gpio = irq - lnw->irq_base; | |
149 | u8 reg = gpio / 32; | |
150 | void __iomem *gedr; | |
151 | ||
152 | gedr = (void __iomem *)(&lnw->reg_base->GEDR[reg]); | |
153 | writel(BIT(gpio % 32), gedr); | |
154 | }; | |
155 | ||
156 | static void lnw_irq_mask(unsigned irq) | |
157 | { | |
158 | }; | |
159 | ||
160 | static struct irq_chip lnw_irqchip = { | |
161 | .name = "LNW-GPIO", | |
162 | .mask = lnw_irq_mask, | |
163 | .unmask = lnw_irq_unmask, | |
164 | .set_type = lnw_irq_type, | |
165 | }; | |
166 | ||
167 | static struct pci_device_id lnw_gpio_ids[] = { | |
168 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f) }, | |
169 | { 0, } | |
170 | }; | |
171 | MODULE_DEVICE_TABLE(pci, lnw_gpio_ids); | |
172 | ||
173 | static void lnw_irq_handler(unsigned irq, struct irq_desc *desc) | |
174 | { | |
175 | struct lnw_gpio *lnw = (struct lnw_gpio *)get_irq_data(irq); | |
176 | u32 reg, gpio; | |
177 | void __iomem *gedr; | |
178 | u32 gedr_v; | |
179 | ||
180 | /* check GPIO controller to check which pin triggered the interrupt */ | |
181 | for (reg = 0; reg < lnw->chip.ngpio / 32; reg++) { | |
182 | gedr = (void __iomem *)(&lnw->reg_base->GEDR[reg]); | |
183 | gedr_v = readl(gedr); | |
184 | if (!gedr_v) | |
185 | continue; | |
186 | for (gpio = reg*32; gpio < reg*32+32; gpio++) { | |
187 | gedr_v = readl(gedr); | |
188 | if (gedr_v & BIT(gpio % 32)) { | |
189 | pr_debug("pin %d triggered\n", gpio); | |
190 | generic_handle_irq(lnw->irq_base + gpio); | |
191 | } | |
192 | } | |
193 | /* clear the edge detect status bit */ | |
194 | writel(gedr_v, gedr); | |
195 | } | |
196 | desc->chip->eoi(irq); | |
197 | } | |
198 | ||
199 | static int __devinit lnw_gpio_probe(struct pci_dev *pdev, | |
200 | const struct pci_device_id *id) | |
201 | { | |
202 | void *base; | |
203 | int i; | |
204 | resource_size_t start, len; | |
205 | struct lnw_gpio *lnw; | |
206 | u32 irq_base; | |
207 | u32 gpio_base; | |
208 | int retval = 0; | |
209 | ||
210 | retval = pci_enable_device(pdev); | |
211 | if (retval) | |
212 | goto done; | |
213 | ||
214 | retval = pci_request_regions(pdev, "langwell_gpio"); | |
215 | if (retval) { | |
216 | dev_err(&pdev->dev, "error requesting resources\n"); | |
217 | goto err2; | |
218 | } | |
219 | /* get the irq_base from bar1 */ | |
220 | start = pci_resource_start(pdev, 1); | |
221 | len = pci_resource_len(pdev, 1); | |
222 | base = ioremap_nocache(start, len); | |
223 | if (!base) { | |
224 | dev_err(&pdev->dev, "error mapping bar1\n"); | |
225 | goto err3; | |
226 | } | |
227 | irq_base = *(u32 *)base; | |
228 | gpio_base = *((u32 *)base + 1); | |
229 | /* release the IO mapping, since we already get the info from bar1 */ | |
230 | iounmap(base); | |
231 | /* get the register base from bar0 */ | |
232 | start = pci_resource_start(pdev, 0); | |
233 | len = pci_resource_len(pdev, 0); | |
234 | base = ioremap_nocache(start, len); | |
235 | if (!base) { | |
236 | dev_err(&pdev->dev, "error mapping bar0\n"); | |
237 | retval = -EFAULT; | |
238 | goto err3; | |
239 | } | |
240 | ||
241 | lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL); | |
242 | if (!lnw) { | |
243 | dev_err(&pdev->dev, "can't allocate langwell_gpio chip data\n"); | |
244 | retval = -ENOMEM; | |
245 | goto err4; | |
246 | } | |
247 | lnw->reg_base = base; | |
248 | lnw->irq_base = irq_base; | |
249 | lnw->chip.label = dev_name(&pdev->dev); | |
250 | lnw->chip.direction_input = lnw_gpio_direction_input; | |
251 | lnw->chip.direction_output = lnw_gpio_direction_output; | |
252 | lnw->chip.get = lnw_gpio_get; | |
253 | lnw->chip.set = lnw_gpio_set; | |
254 | lnw->chip.to_irq = lnw_gpio_to_irq; | |
255 | lnw->chip.base = gpio_base; | |
256 | lnw->chip.ngpio = 64; | |
257 | lnw->chip.can_sleep = 0; | |
258 | pci_set_drvdata(pdev, lnw); | |
259 | retval = gpiochip_add(&lnw->chip); | |
260 | if (retval) { | |
261 | dev_err(&pdev->dev, "langwell gpiochip_add error %d\n", retval); | |
262 | goto err5; | |
263 | } | |
264 | set_irq_data(pdev->irq, lnw); | |
265 | set_irq_chained_handler(pdev->irq, lnw_irq_handler); | |
266 | for (i = 0; i < lnw->chip.ngpio; i++) { | |
267 | set_irq_chip_and_handler_name(i + lnw->irq_base, &lnw_irqchip, | |
268 | handle_simple_irq, "demux"); | |
269 | set_irq_chip_data(i + lnw->irq_base, lnw); | |
270 | } | |
271 | ||
272 | spin_lock_init(&lnw->lock); | |
273 | goto done; | |
274 | err5: | |
275 | kfree(lnw); | |
276 | err4: | |
277 | iounmap(base); | |
278 | err3: | |
279 | pci_release_regions(pdev); | |
280 | err2: | |
281 | pci_disable_device(pdev); | |
282 | done: | |
283 | return retval; | |
284 | } | |
285 | ||
286 | static struct pci_driver lnw_gpio_driver = { | |
287 | .name = "langwell_gpio", | |
288 | .id_table = lnw_gpio_ids, | |
289 | .probe = lnw_gpio_probe, | |
290 | }; | |
291 | ||
292 | static int __init lnw_gpio_init(void) | |
293 | { | |
294 | return pci_register_driver(&lnw_gpio_driver); | |
295 | } | |
296 | ||
297 | device_initcall(lnw_gpio_init); |