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Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +02001/*
2 * GPIO interface for Intel Sodaville SoCs.
3 *
4 * Copyright (c) 2010, 2011 Intel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License 2 as published
8 * by the Free Software Foundation.
9 *
10 */
11
12#include <linux/errno.h>
13#include <linux/gpio.h>
14#include <linux/init.h>
15#include <linux/io.h>
16#include <linux/irq.h>
17#include <linux/interrupt.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/pci.h>
21#include <linux/platform_device.h>
22#include <linux/of_irq.h>
23#include <linux/basic_mmio_gpio.h>
24
25#define DRV_NAME "sdv_gpio"
26#define SDV_NUM_PUB_GPIOS 12
27#define PCI_DEVICE_ID_SDV_GPIO 0x2e67
28#define GPIO_BAR 0
29
30#define GPOUTR 0x00
31#define GPOER 0x04
32#define GPINR 0x08
33
34#define GPSTR 0x0c
35#define GPIT1R0 0x10
36#define GPIO_INT 0x14
37#define GPIT1R1 0x18
38
39#define GPMUXCTL 0x1c
40
41struct sdv_gpio_chip_data {
42 int irq_base;
43 void __iomem *gpio_pub_base;
Grant Likely3ffc9ce2012-03-28 14:55:04 -060044 struct irq_domain *id;
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +020045 struct irq_chip_generic *gc;
46 struct bgpio_chip bgpio;
47};
48
49static int sdv_gpio_pub_set_type(struct irq_data *d, unsigned int type)
50{
51 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
52 struct sdv_gpio_chip_data *sd = gc->private;
53 void __iomem *type_reg;
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +020054 u32 reg;
55
Grant Likely3ffc9ce2012-03-28 14:55:04 -060056 if (d->hwirq < 8)
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +020057 type_reg = sd->gpio_pub_base + GPIT1R0;
58 else
59 type_reg = sd->gpio_pub_base + GPIT1R1;
60
61 reg = readl(type_reg);
62
63 switch (type) {
64 case IRQ_TYPE_LEVEL_HIGH:
Grant Likely3ffc9ce2012-03-28 14:55:04 -060065 reg &= ~BIT(4 * (d->hwirq % 8));
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +020066 break;
67
68 case IRQ_TYPE_LEVEL_LOW:
Grant Likely3ffc9ce2012-03-28 14:55:04 -060069 reg |= BIT(4 * (d->hwirq % 8));
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +020070 break;
71
72 default:
73 return -EINVAL;
74 }
75
76 writel(reg, type_reg);
77 return 0;
78}
79
80static irqreturn_t sdv_gpio_pub_irq_handler(int irq, void *data)
81{
82 struct sdv_gpio_chip_data *sd = data;
83 u32 irq_stat = readl(sd->gpio_pub_base + GPSTR);
84
85 irq_stat &= readl(sd->gpio_pub_base + GPIO_INT);
86 if (!irq_stat)
87 return IRQ_NONE;
88
89 while (irq_stat) {
90 u32 irq_bit = __fls(irq_stat);
91
92 irq_stat &= ~BIT(irq_bit);
Grant Likely3ffc9ce2012-03-28 14:55:04 -060093 generic_handle_irq(irq_find_mapping(sd->id, irq_bit));
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +020094 }
95
96 return IRQ_HANDLED;
97}
98
99static int sdv_xlate(struct irq_domain *h, struct device_node *node,
100 const u32 *intspec, u32 intsize, irq_hw_number_t *out_hwirq,
101 u32 *out_type)
102{
103 u32 line, type;
104
105 if (node != h->of_node)
106 return -EINVAL;
107
108 if (intsize < 2)
109 return -EINVAL;
110
111 line = *intspec;
112 *out_hwirq = line;
113
114 intspec++;
115 type = *intspec;
116
117 switch (type) {
118 case IRQ_TYPE_LEVEL_LOW:
119 case IRQ_TYPE_LEVEL_HIGH:
120 *out_type = type;
121 break;
122 default:
123 return -EINVAL;
124 }
125 return 0;
126}
127
128static struct irq_domain_ops irq_domain_sdv_ops = {
Grant Likely3ffc9ce2012-03-28 14:55:04 -0600129 .xlate = sdv_xlate,
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +0200130};
131
132static __devinit int sdv_register_irqsupport(struct sdv_gpio_chip_data *sd,
133 struct pci_dev *pdev)
134{
135 struct irq_chip_type *ct;
136 int ret;
137
138 sd->irq_base = irq_alloc_descs(-1, 0, SDV_NUM_PUB_GPIOS, -1);
139 if (sd->irq_base < 0)
140 return sd->irq_base;
141
142 /* mask + ACK all interrupt sources */
143 writel(0, sd->gpio_pub_base + GPIO_INT);
144 writel((1 << 11) - 1, sd->gpio_pub_base + GPSTR);
145
146 ret = request_irq(pdev->irq, sdv_gpio_pub_irq_handler, IRQF_SHARED,
147 "sdv_gpio", sd);
148 if (ret)
149 goto out_free_desc;
150
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +0200151 /*
152 * This gpio irq controller latches level irqs. Testing shows that if
153 * we unmask & ACK the IRQ before the source of the interrupt is gone
154 * then the interrupt is active again.
155 */
156 sd->gc = irq_alloc_generic_chip("sdv-gpio", 1, sd->irq_base,
157 sd->gpio_pub_base, handle_fasteoi_irq);
158 if (!sd->gc) {
159 ret = -ENOMEM;
160 goto out_free_irq;
161 }
162
163 sd->gc->private = sd;
164 ct = sd->gc->chip_types;
165 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
166 ct->regs.eoi = GPSTR;
167 ct->regs.mask = GPIO_INT;
168 ct->chip.irq_mask = irq_gc_mask_clr_bit;
169 ct->chip.irq_unmask = irq_gc_mask_set_bit;
170 ct->chip.irq_eoi = irq_gc_eoi;
171 ct->chip.irq_set_type = sdv_gpio_pub_set_type;
172
173 irq_setup_generic_chip(sd->gc, IRQ_MSK(SDV_NUM_PUB_GPIOS),
174 IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST,
175 IRQ_LEVEL | IRQ_NOPROBE);
176
Grant Likely3ffc9ce2012-03-28 14:55:04 -0600177 sd->id = irq_domain_add_legacy(pdev->dev.of_node, SDV_NUM_PUB_GPIOS,
178 sd->irq_base, 0, &irq_domain_sdv_ops, sd);
179 if (!sd->id)
180 goto out_free_irq;
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +0200181 return 0;
182out_free_irq:
183 free_irq(pdev->irq, sd);
184out_free_desc:
185 irq_free_descs(sd->irq_base, SDV_NUM_PUB_GPIOS);
186 return ret;
187}
188
189static int __devinit sdv_gpio_probe(struct pci_dev *pdev,
190 const struct pci_device_id *pci_id)
191{
192 struct sdv_gpio_chip_data *sd;
193 unsigned long addr;
194 const void *prop;
195 int len;
196 int ret;
197 u32 mux_val;
198
199 sd = kzalloc(sizeof(struct sdv_gpio_chip_data), GFP_KERNEL);
200 if (!sd)
201 return -ENOMEM;
202 ret = pci_enable_device(pdev);
203 if (ret) {
204 dev_err(&pdev->dev, "can't enable device.\n");
205 goto done;
206 }
207
208 ret = pci_request_region(pdev, GPIO_BAR, DRV_NAME);
209 if (ret) {
210 dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", GPIO_BAR);
211 goto disable_pci;
212 }
213
214 addr = pci_resource_start(pdev, GPIO_BAR);
215 if (!addr)
216 goto release_reg;
217 sd->gpio_pub_base = ioremap(addr, pci_resource_len(pdev, GPIO_BAR));
218
219 prop = of_get_property(pdev->dev.of_node, "intel,muxctl", &len);
220 if (prop && len == 4) {
221 mux_val = of_read_number(prop, 1);
222 writel(mux_val, sd->gpio_pub_base + GPMUXCTL);
223 }
224
225 ret = bgpio_init(&sd->bgpio, &pdev->dev, 4,
226 sd->gpio_pub_base + GPINR, sd->gpio_pub_base + GPOUTR,
Shawn Guo3e11f7b2012-05-19 21:34:58 +0800227 NULL, sd->gpio_pub_base + GPOER, NULL, 0);
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +0200228 if (ret)
229 goto unmap;
230 sd->bgpio.gc.ngpio = SDV_NUM_PUB_GPIOS;
231
232 ret = gpiochip_add(&sd->bgpio.gc);
233 if (ret < 0) {
234 dev_err(&pdev->dev, "gpiochip_add() failed.\n");
235 goto unmap;
236 }
237
238 ret = sdv_register_irqsupport(sd, pdev);
239 if (ret)
240 goto unmap;
241
242 pci_set_drvdata(pdev, sd);
243 dev_info(&pdev->dev, "Sodaville GPIO driver registered.\n");
244 return 0;
245
246unmap:
247 iounmap(sd->gpio_pub_base);
248release_reg:
249 pci_release_region(pdev, GPIO_BAR);
250disable_pci:
251 pci_disable_device(pdev);
252done:
253 kfree(sd);
254 return ret;
255}
256
257static void sdv_gpio_remove(struct pci_dev *pdev)
258{
259 struct sdv_gpio_chip_data *sd = pci_get_drvdata(pdev);
260
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +0200261 free_irq(pdev->irq, sd);
262 irq_free_descs(sd->irq_base, SDV_NUM_PUB_GPIOS);
263
264 if (gpiochip_remove(&sd->bgpio.gc))
265 dev_err(&pdev->dev, "gpiochip_remove() failed.\n");
266
267 pci_release_region(pdev, GPIO_BAR);
268 iounmap(sd->gpio_pub_base);
269 pci_disable_device(pdev);
270 kfree(sd);
271}
272
273static struct pci_device_id sdv_gpio_pci_ids[] __devinitdata = {
274 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_SDV_GPIO) },
275 { 0, },
276};
277
278static struct pci_driver sdv_gpio_driver = {
279 .name = DRV_NAME,
280 .id_table = sdv_gpio_pci_ids,
281 .probe = sdv_gpio_probe,
282 .remove = sdv_gpio_remove,
283};
284
Axel Lin93baa652012-04-06 20:13:30 +0800285module_pci_driver(sdv_gpio_driver);
Sebastian Andrzej Siewiorb43ab902011-06-27 09:26:23 +0200286
287MODULE_AUTHOR("Hans J. Koch <hjk@linutronix.de>");
288MODULE_DESCRIPTION("GPIO interface for Intel Sodaville SoCs");
289MODULE_LICENSE("GPL v2");