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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 * Quan Nguyen <qnguyen@apm.com>.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23#include <linux/module.h>
24#include <linux/io.h>
25#include <linux/platform_device.h>
26#include <linux/of_gpio.h>
27#include <linux/gpio/driver.h>
28#include <linux/acpi.h>
29
30#include "gpiolib.h"
31
32/* Common property names */
33#define XGENE_NIRQ_PROPERTY "apm,nr-irqs"
34#define XGENE_NGPIO_PROPERTY "apm,nr-gpios"
35#define XGENE_IRQ_START_PROPERTY "apm,irq-start"
36
37#define XGENE_DFLT_MAX_NGPIO 22
38#define XGENE_DFLT_MAX_NIRQ 6
39#define XGENE_DFLT_IRQ_START_PIN 8
40#define GPIO_MASK(x) (1U << ((x) % 32))
41
42#define MPA_GPIO_INT_LVL 0x0290
43#define MPA_GPIO_OE_ADDR 0x029c
44#define MPA_GPIO_OUT_ADDR 0x02a0
45#define MPA_GPIO_IN_ADDR 0x02a4
46#define MPA_GPIO_SEL_LO 0x0294
47
48#define GPIO_INT_LEVEL_H 0x000001
49#define GPIO_INT_LEVEL_L 0x000000
50
51/**
52 * struct xgene_gpio_sb - GPIO-Standby private data structure.
53 * @gc: memory-mapped GPIO controllers.
54 * @regs: GPIO register base offset
55 * @irq_domain: GPIO interrupt domain
56 * @irq_start: GPIO pin that start support interrupt
57 * @nirq: Number of GPIO pins that supports interrupt
58 * @parent_irq_base: Start parent HWIRQ
59 */
60struct xgene_gpio_sb {
61 struct gpio_chip gc;
62 void __iomem *regs;
63 struct irq_domain *irq_domain;
64 u16 irq_start;
65 u16 nirq;
66 u16 parent_irq_base;
67};
68
69#define HWIRQ_TO_GPIO(priv, hwirq) ((hwirq) + (priv)->irq_start)
70#define GPIO_TO_HWIRQ(priv, gpio) ((gpio) - (priv)->irq_start)
71
72static void xgene_gpio_set_bit(struct gpio_chip *gc,
73 void __iomem *reg, u32 gpio, int val)
74{
75 u32 data;
76
77 data = gc->read_reg(reg);
78 if (val)
79 data |= GPIO_MASK(gpio);
80 else
81 data &= ~GPIO_MASK(gpio);
82 gc->write_reg(reg, data);
83}
84
85static int xgene_gpio_sb_irq_set_type(struct irq_data *d, unsigned int type)
86{
87 struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d);
88 int gpio = HWIRQ_TO_GPIO(priv, d->hwirq);
89 int lvl_type = GPIO_INT_LEVEL_H;
90
91 switch (type & IRQ_TYPE_SENSE_MASK) {
92 case IRQ_TYPE_EDGE_RISING:
93 case IRQ_TYPE_LEVEL_HIGH:
94 lvl_type = GPIO_INT_LEVEL_H;
95 break;
96 case IRQ_TYPE_EDGE_FALLING:
97 case IRQ_TYPE_LEVEL_LOW:
98 lvl_type = GPIO_INT_LEVEL_L;
99 break;
100 default:
101 break;
102 }
103
104 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
105 gpio * 2, 1);
106 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL,
107 d->hwirq, lvl_type);
108
109 /* Propagate IRQ type setting to parent */
110 if (type & IRQ_TYPE_EDGE_BOTH)
111 return irq_chip_set_type_parent(d, IRQ_TYPE_EDGE_RISING);
112 else
113 return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
114}
115
116static struct irq_chip xgene_gpio_sb_irq_chip = {
117 .name = "sbgpio",
118 .irq_eoi = irq_chip_eoi_parent,
119 .irq_mask = irq_chip_mask_parent,
120 .irq_unmask = irq_chip_unmask_parent,
121 .irq_set_type = xgene_gpio_sb_irq_set_type,
122};
123
124static int xgene_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio)
125{
126 struct xgene_gpio_sb *priv = gpiochip_get_data(gc);
127 struct irq_fwspec fwspec;
128
129 if ((gpio < priv->irq_start) ||
130 (gpio > HWIRQ_TO_GPIO(priv, priv->nirq)))
131 return -ENXIO;
132
133 fwspec.fwnode = gc->parent->fwnode;
134 fwspec.param_count = 2;
135 fwspec.param[0] = GPIO_TO_HWIRQ(priv, gpio);
136 fwspec.param[1] = IRQ_TYPE_NONE;
137 return irq_create_fwspec_mapping(&fwspec);
138}
139
140static int xgene_gpio_sb_domain_activate(struct irq_domain *d,
141 struct irq_data *irq_data,
142 bool reserve)
143{
144 struct xgene_gpio_sb *priv = d->host_data;
145 u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);
146 int ret;
147
148 ret = gpiochip_lock_as_irq(&priv->gc, gpio);
149 if (ret) {
150 dev_err(priv->gc.parent,
151 "Unable to configure XGene GPIO standby pin %d as IRQ\n",
152 gpio);
153 return ret;
154 }
155
156 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
157 gpio * 2, 1);
158 return 0;
159}
160
161static void xgene_gpio_sb_domain_deactivate(struct irq_domain *d,
162 struct irq_data *irq_data)
163{
164 struct xgene_gpio_sb *priv = d->host_data;
165 u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);
166
167 gpiochip_unlock_as_irq(&priv->gc, gpio);
168 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,
169 gpio * 2, 0);
170}
171
172static int xgene_gpio_sb_domain_translate(struct irq_domain *d,
173 struct irq_fwspec *fwspec,
174 unsigned long *hwirq,
175 unsigned int *type)
176{
177 struct xgene_gpio_sb *priv = d->host_data;
178
179 if ((fwspec->param_count != 2) ||
180 (fwspec->param[0] >= priv->nirq))
181 return -EINVAL;
182 *hwirq = fwspec->param[0];
183 *type = fwspec->param[1];
184 return 0;
185}
186
187static int xgene_gpio_sb_domain_alloc(struct irq_domain *domain,
188 unsigned int virq,
189 unsigned int nr_irqs, void *data)
190{
191 struct irq_fwspec *fwspec = data;
192 struct irq_fwspec parent_fwspec;
193 struct xgene_gpio_sb *priv = domain->host_data;
194 irq_hw_number_t hwirq;
195 unsigned int i;
196
197 hwirq = fwspec->param[0];
198 for (i = 0; i < nr_irqs; i++)
199 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
200 &xgene_gpio_sb_irq_chip, priv);
201
202 parent_fwspec.fwnode = domain->parent->fwnode;
203 if (is_of_node(parent_fwspec.fwnode)) {
204 parent_fwspec.param_count = 3;
205 parent_fwspec.param[0] = 0;/* SPI */
206 /* Skip SGIs and PPIs*/
207 parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32;
208 parent_fwspec.param[2] = fwspec->param[1];
209 } else if (is_fwnode_irqchip(parent_fwspec.fwnode)) {
210 parent_fwspec.param_count = 2;
211 parent_fwspec.param[0] = hwirq + priv->parent_irq_base;
212 parent_fwspec.param[1] = fwspec->param[1];
213 } else
214 return -EINVAL;
215
216 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
217 &parent_fwspec);
218}
219
220static const struct irq_domain_ops xgene_gpio_sb_domain_ops = {
221 .translate = xgene_gpio_sb_domain_translate,
222 .alloc = xgene_gpio_sb_domain_alloc,
223 .free = irq_domain_free_irqs_common,
224 .activate = xgene_gpio_sb_domain_activate,
225 .deactivate = xgene_gpio_sb_domain_deactivate,
226};
227
228static int xgene_gpio_sb_probe(struct platform_device *pdev)
229{
230 struct xgene_gpio_sb *priv;
231 int ret;
232 struct resource *res;
233 void __iomem *regs;
234 struct irq_domain *parent_domain = NULL;
235 u32 val32;
236
237 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
238 if (!priv)
239 return -ENOMEM;
240
241 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
242 regs = devm_ioremap_resource(&pdev->dev, res);
243 if (IS_ERR(regs))
244 return PTR_ERR(regs);
245
246 priv->regs = regs;
247
248 ret = platform_get_irq(pdev, 0);
249 if (ret > 0) {
250 priv->parent_irq_base = irq_get_irq_data(ret)->hwirq;
251 parent_domain = irq_get_irq_data(ret)->domain;
252 }
253 if (!parent_domain) {
254 dev_err(&pdev->dev, "unable to obtain parent domain\n");
255 return -ENODEV;
256 }
257
258 ret = bgpio_init(&priv->gc, &pdev->dev, 4,
259 regs + MPA_GPIO_IN_ADDR,
260 regs + MPA_GPIO_OUT_ADDR, NULL,
261 regs + MPA_GPIO_OE_ADDR, NULL, 0);
262 if (ret)
263 return ret;
264
265 priv->gc.to_irq = xgene_gpio_sb_to_irq;
266
267 /* Retrieve start irq pin, use default if property not found */
268 priv->irq_start = XGENE_DFLT_IRQ_START_PIN;
269 if (!device_property_read_u32(&pdev->dev,
270 XGENE_IRQ_START_PROPERTY, &val32))
271 priv->irq_start = val32;
272
273 /* Retrieve number irqs, use default if property not found */
274 priv->nirq = XGENE_DFLT_MAX_NIRQ;
275 if (!device_property_read_u32(&pdev->dev, XGENE_NIRQ_PROPERTY, &val32))
276 priv->nirq = val32;
277
278 /* Retrieve number gpio, use default if property not found */
279 priv->gc.ngpio = XGENE_DFLT_MAX_NGPIO;
280 if (!device_property_read_u32(&pdev->dev, XGENE_NGPIO_PROPERTY, &val32))
281 priv->gc.ngpio = val32;
282
283 dev_info(&pdev->dev, "Support %d gpios, %d irqs start from pin %d\n",
284 priv->gc.ngpio, priv->nirq, priv->irq_start);
285
286 platform_set_drvdata(pdev, priv);
287
288 priv->irq_domain = irq_domain_create_hierarchy(parent_domain,
289 0, priv->nirq, pdev->dev.fwnode,
290 &xgene_gpio_sb_domain_ops, priv);
291 if (!priv->irq_domain)
292 return -ENODEV;
293
294 priv->gc.irq.domain = priv->irq_domain;
295
296 ret = devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
297 if (ret) {
298 dev_err(&pdev->dev,
299 "failed to register X-Gene GPIO Standby driver\n");
300 irq_domain_remove(priv->irq_domain);
301 return ret;
302 }
303
304 dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");
305
306 if (priv->nirq > 0) {
307 /* Register interrupt handlers for gpio signaled acpi events */
308 acpi_gpiochip_request_interrupts(&priv->gc);
309 }
310
311 return ret;
312}
313
314static int xgene_gpio_sb_remove(struct platform_device *pdev)
315{
316 struct xgene_gpio_sb *priv = platform_get_drvdata(pdev);
317
318 if (priv->nirq > 0) {
319 acpi_gpiochip_free_interrupts(&priv->gc);
320 }
321
322 irq_domain_remove(priv->irq_domain);
323
324 return 0;
325}
326
327static const struct of_device_id xgene_gpio_sb_of_match[] = {
328 {.compatible = "apm,xgene-gpio-sb", },
329 {},
330};
331MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match);
332
333#ifdef CONFIG_ACPI
334static const struct acpi_device_id xgene_gpio_sb_acpi_match[] = {
335 {"APMC0D15", 0},
336 {},
337};
338MODULE_DEVICE_TABLE(acpi, xgene_gpio_sb_acpi_match);
339#endif
340
341static struct platform_driver xgene_gpio_sb_driver = {
342 .driver = {
343 .name = "xgene-gpio-sb",
344 .of_match_table = xgene_gpio_sb_of_match,
345 .acpi_match_table = ACPI_PTR(xgene_gpio_sb_acpi_match),
346 },
347 .probe = xgene_gpio_sb_probe,
348 .remove = xgene_gpio_sb_remove,
349};
350module_platform_driver(xgene_gpio_sb_driver);
351
352MODULE_AUTHOR("AppliedMicro");
353MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver");
354MODULE_LICENSE("GPL");
355

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