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Denis Turischevbe9b06b2010-03-02 10:48:55 +01001/*
Grant Likelyc103de22011-06-04 18:38:28 -06002 * GPIO interface for Intel Poulsbo SCH
Denis Turischevbe9b06b2010-03-02 10:48:55 +01003 *
4 * Copyright (c) 2010 CompuLab Ltd
5 * Author: Denis Turischev <denis@compulab.co.il>
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 2 as published
9 * by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#include <linux/init.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/io.h>
25#include <linux/errno.h>
26#include <linux/acpi.h>
27#include <linux/platform_device.h>
Denis Turischevf04ddfc2011-03-14 12:53:05 +020028#include <linux/pci_ids.h>
Denis Turischevbe9b06b2010-03-02 10:48:55 +010029
30#include <linux/gpio.h>
31
Mika Westerbergc479ff02014-10-21 13:33:56 +020032#define GEN 0x00
33#define GIO 0x04
34#define GLV 0x08
Denis Turischevbe9b06b2010-03-02 10:48:55 +010035
Mika Westerbergc479ff02014-10-21 13:33:56 +020036struct sch_gpio {
37 struct gpio_chip chip;
38 spinlock_t lock;
39 unsigned short iobase;
40 unsigned short core_base;
41 unsigned short resume_base;
42};
Denis Turischevbe9b06b2010-03-02 10:48:55 +010043
Mika Westerbergc479ff02014-10-21 13:33:56 +020044static unsigned sch_gpio_offset(struct sch_gpio *sch, unsigned gpio,
45 unsigned reg)
Denis Turischevbe9b06b2010-03-02 10:48:55 +010046{
Mika Westerbergc479ff02014-10-21 13:33:56 +020047 unsigned base = 0;
48
49 if (gpio >= sch->resume_base) {
50 gpio -= sch->resume_base;
51 base += 0x20;
52 }
53
54 return base + reg + gpio / 8;
55}
56
57static unsigned sch_gpio_bit(struct sch_gpio *sch, unsigned gpio)
58{
59 if (gpio >= sch->resume_base)
60 gpio -= sch->resume_base;
61 return gpio % 8;
62}
63
Colin Pitrat87041a52016-06-18 19:05:04 +010064static int sch_gpio_reg_get(struct sch_gpio *sch, unsigned gpio, unsigned reg)
Mika Westerbergc479ff02014-10-21 13:33:56 +020065{
Denis Turischevbe9b06b2010-03-02 10:48:55 +010066 unsigned short offset, bit;
Chang Rebecca Swee Fun920dfd82015-01-21 18:32:21 +080067 u8 reg_val;
68
69 offset = sch_gpio_offset(sch, gpio, reg);
70 bit = sch_gpio_bit(sch, gpio);
71
72 reg_val = !!(inb(sch->iobase + offset) & BIT(bit));
73
74 return reg_val;
75}
76
Colin Pitrat87041a52016-06-18 19:05:04 +010077static void sch_gpio_reg_set(struct sch_gpio *sch, unsigned gpio, unsigned reg,
Chang Rebecca Swee Fun920dfd82015-01-21 18:32:21 +080078 int val)
79{
Chang Rebecca Swee Fun920dfd82015-01-21 18:32:21 +080080 unsigned short offset, bit;
81 u8 reg_val;
82
83 offset = sch_gpio_offset(sch, gpio, reg);
84 bit = sch_gpio_bit(sch, gpio);
85
86 reg_val = inb(sch->iobase + offset);
87
88 if (val)
89 outb(reg_val | BIT(bit), sch->iobase + offset);
90 else
91 outb((reg_val & ~BIT(bit)), sch->iobase + offset);
92}
93
94static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
95{
Linus Walleij737c8fc2015-12-07 14:21:49 +010096 struct sch_gpio *sch = gpiochip_get_data(gc);
Denis Turischevbe9b06b2010-03-02 10:48:55 +010097
Mika Westerbergc479ff02014-10-21 13:33:56 +020098 spin_lock(&sch->lock);
Colin Pitrat87041a52016-06-18 19:05:04 +010099 sch_gpio_reg_set(sch, gpio_num, GIO, 1);
Mika Westerbergc479ff02014-10-21 13:33:56 +0200100 spin_unlock(&sch->lock);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100101 return 0;
102}
103
Mika Westerbergc479ff02014-10-21 13:33:56 +0200104static int sch_gpio_get(struct gpio_chip *gc, unsigned gpio_num)
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100105{
Colin Pitrat87041a52016-06-18 19:05:04 +0100106 struct sch_gpio *sch = gpiochip_get_data(gc);
107 return sch_gpio_reg_get(sch, gpio_num, GLV);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100108}
109
Mika Westerbergc479ff02014-10-21 13:33:56 +0200110static void sch_gpio_set(struct gpio_chip *gc, unsigned gpio_num, int val)
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100111{
Linus Walleij737c8fc2015-12-07 14:21:49 +0100112 struct sch_gpio *sch = gpiochip_get_data(gc);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100113
Mika Westerbergc479ff02014-10-21 13:33:56 +0200114 spin_lock(&sch->lock);
Colin Pitrat87041a52016-06-18 19:05:04 +0100115 sch_gpio_reg_set(sch, gpio_num, GLV, val);
Mika Westerbergc479ff02014-10-21 13:33:56 +0200116 spin_unlock(&sch->lock);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100117}
118
Mika Westerbergc479ff02014-10-21 13:33:56 +0200119static int sch_gpio_direction_out(struct gpio_chip *gc, unsigned gpio_num,
120 int val)
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100121{
Linus Walleij737c8fc2015-12-07 14:21:49 +0100122 struct sch_gpio *sch = gpiochip_get_data(gc);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100123
Mika Westerbergc479ff02014-10-21 13:33:56 +0200124 spin_lock(&sch->lock);
Colin Pitrat87041a52016-06-18 19:05:04 +0100125 sch_gpio_reg_set(sch, gpio_num, GIO, 0);
Mika Westerbergc479ff02014-10-21 13:33:56 +0200126 spin_unlock(&sch->lock);
Daniel Krueger1e0d9822014-04-07 14:20:32 +0200127
128 /*
129 * according to the datasheet, writing to the level register has no
130 * effect when GPIO is programmed as input.
131 * Actually the the level register is read-only when configured as input.
132 * Thus presetting the output level before switching to output is _NOT_ possible.
133 * Hence we set the level after configuring the GPIO as output.
134 * But we cannot prevent a short low pulse if direction is set to high
135 * and an external pull-up is connected.
136 */
Mika Westerbergc479ff02014-10-21 13:33:56 +0200137 sch_gpio_set(gc, gpio_num, val);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100138 return 0;
139}
140
Julia Lawalle35b5ab2016-09-11 14:14:37 +0200141static const struct gpio_chip sch_gpio_chip = {
Mika Westerbergc479ff02014-10-21 13:33:56 +0200142 .label = "sch_gpio",
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100143 .owner = THIS_MODULE,
Mika Westerbergc479ff02014-10-21 13:33:56 +0200144 .direction_input = sch_gpio_direction_in,
145 .get = sch_gpio_get,
146 .direction_output = sch_gpio_direction_out,
147 .set = sch_gpio_set,
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100148};
149
Bill Pemberton38363092012-11-19 13:22:34 -0500150static int sch_gpio_probe(struct platform_device *pdev)
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100151{
Mika Westerbergc479ff02014-10-21 13:33:56 +0200152 struct sch_gpio *sch;
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100153 struct resource *res;
Denis Turischevf04ddfc2011-03-14 12:53:05 +0200154
Mika Westerbergc479ff02014-10-21 13:33:56 +0200155 sch = devm_kzalloc(&pdev->dev, sizeof(*sch), GFP_KERNEL);
156 if (!sch)
157 return -ENOMEM;
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100158
159 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
160 if (!res)
161 return -EBUSY;
162
Mika Westerbergc479ff02014-10-21 13:33:56 +0200163 if (!devm_request_region(&pdev->dev, res->start, resource_size(res),
164 pdev->name))
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100165 return -EBUSY;
166
Mika Westerbergc479ff02014-10-21 13:33:56 +0200167 spin_lock_init(&sch->lock);
168 sch->iobase = res->start;
169 sch->chip = sch_gpio_chip;
170 sch->chip.label = dev_name(&pdev->dev);
Linus Walleij58383c72015-11-04 09:56:26 +0100171 sch->chip.parent = &pdev->dev;
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100172
Mika Westerbergc479ff02014-10-21 13:33:56 +0200173 switch (pdev->id) {
Laurent Navetbe41cf52013-03-20 13:16:00 +0100174 case PCI_DEVICE_ID_INTEL_SCH_LPC:
Mika Westerbergc479ff02014-10-21 13:33:56 +0200175 sch->core_base = 0;
176 sch->resume_base = 10;
177 sch->chip.ngpio = 14;
178
Laurent Navetbe41cf52013-03-20 13:16:00 +0100179 /*
180 * GPIO[6:0] enabled by default
181 * GPIO7 is configured by the CMC as SLPIOVR
182 * Enable GPIO[9:8] core powered gpios explicitly
183 */
Colin Pitrat87041a52016-06-18 19:05:04 +0100184 sch_gpio_reg_set(sch, 8, GEN, 1);
185 sch_gpio_reg_set(sch, 9, GEN, 1);
Laurent Navetbe41cf52013-03-20 13:16:00 +0100186 /*
187 * SUS_GPIO[2:0] enabled by default
188 * Enable SUS_GPIO3 resume powered gpio explicitly
189 */
Colin Pitrat87041a52016-06-18 19:05:04 +0100190 sch_gpio_reg_set(sch, 13, GEN, 1);
Laurent Navetbe41cf52013-03-20 13:16:00 +0100191 break;
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100192
Laurent Navetbe41cf52013-03-20 13:16:00 +0100193 case PCI_DEVICE_ID_INTEL_ITC_LPC:
Mika Westerbergc479ff02014-10-21 13:33:56 +0200194 sch->core_base = 0;
195 sch->resume_base = 5;
196 sch->chip.ngpio = 14;
Laurent Navetbe41cf52013-03-20 13:16:00 +0100197 break;
Denis Turischevf04ddfc2011-03-14 12:53:05 +0200198
Laurent Navetbe41cf52013-03-20 13:16:00 +0100199 case PCI_DEVICE_ID_INTEL_CENTERTON_ILB:
Mika Westerbergc479ff02014-10-21 13:33:56 +0200200 sch->core_base = 0;
201 sch->resume_base = 21;
202 sch->chip.ngpio = 30;
Laurent Navetbe41cf52013-03-20 13:16:00 +0100203 break;
Denis Turischevf04ddfc2011-03-14 12:53:05 +0200204
Chang Rebecca Swee Fun92021492014-12-08 17:38:10 +0800205 case PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB:
206 sch->core_base = 0;
207 sch->resume_base = 2;
208 sch->chip.ngpio = 8;
209 break;
210
Laurent Navetbe41cf52013-03-20 13:16:00 +0100211 default:
Mika Westerbergc479ff02014-10-21 13:33:56 +0200212 return -ENODEV;
Denis Turischevf04ddfc2011-03-14 12:53:05 +0200213 }
214
Mika Westerbergc479ff02014-10-21 13:33:56 +0200215 platform_set_drvdata(pdev, sch);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100216
Laxman Dewanganc1411462016-02-22 17:43:28 +0530217 return devm_gpiochip_add_data(&pdev->dev, &sch->chip, sch);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100218}
219
220static struct platform_driver sch_gpio_driver = {
221 .driver = {
222 .name = "sch_gpio",
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100223 },
224 .probe = sch_gpio_probe,
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100225};
226
Mark Brown6f614152011-12-08 00:24:00 +0800227module_platform_driver(sch_gpio_driver);
Denis Turischevbe9b06b2010-03-02 10:48:55 +0100228
229MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
230MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH");
231MODULE_LICENSE("GPL");
232MODULE_ALIAS("platform:sch_gpio");