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-rw-r--r--arch/powerpc/platforms/Kconfig11
-rw-r--r--arch/powerpc/sysdev/Makefile1
-rw-r--r--arch/powerpc/sysdev/simple_gpio.c155
-rw-r--r--arch/powerpc/sysdev/simple_gpio.h12
4 files changed, 179 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 47e956c871fe..47fe2bea9865 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -312,4 +312,15 @@ config MPC8xxx_GPIO
312 Say Y here if you're going to use hardware that connects to the 312 Say Y here if you're going to use hardware that connects to the
313 MPC831x/834x/837x/8572/8610 GPIOs. 313 MPC831x/834x/837x/8572/8610 GPIOs.
314 314
315config SIMPLE_GPIO
316 bool "Support for simple, memory-mapped GPIO controllers"
317 depends on PPC
318 select GENERIC_GPIO
319 select ARCH_REQUIRE_GPIOLIB
320 help
321 Say Y here to support simple, memory-mapped GPIO controllers.
322 These are usually BCSRs used to control board's switches, LEDs,
323 chip-selects, Ethernet/USB PHY's power and various other small
324 on-board peripherals.
325
315endmenu 326endmenu
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index 5afce115ab1f..b33b28a6fe12 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_FSL_PCI) += fsl_pci.o $(fsl-msi-obj-y)
17obj-$(CONFIG_FSL_LBC) += fsl_lbc.o 17obj-$(CONFIG_FSL_LBC) += fsl_lbc.o
18obj-$(CONFIG_FSL_GTM) += fsl_gtm.o 18obj-$(CONFIG_FSL_GTM) += fsl_gtm.o
19obj-$(CONFIG_MPC8xxx_GPIO) += mpc8xxx_gpio.o 19obj-$(CONFIG_MPC8xxx_GPIO) += mpc8xxx_gpio.o
20obj-$(CONFIG_SIMPLE_GPIO) += simple_gpio.o
20obj-$(CONFIG_RAPIDIO) += fsl_rio.o 21obj-$(CONFIG_RAPIDIO) += fsl_rio.o
21obj-$(CONFIG_TSI108_BRIDGE) += tsi108_pci.o tsi108_dev.o 22obj-$(CONFIG_TSI108_BRIDGE) += tsi108_pci.o tsi108_dev.o
22obj-$(CONFIG_QUICC_ENGINE) += qe_lib/ 23obj-$(CONFIG_QUICC_ENGINE) += qe_lib/
diff --git a/arch/powerpc/sysdev/simple_gpio.c b/arch/powerpc/sysdev/simple_gpio.c
new file mode 100644
index 000000000000..43c4569e24b7
--- /dev/null
+++ b/arch/powerpc/sysdev/simple_gpio.c
@@ -0,0 +1,155 @@
1/*
2 * Simple Memory-Mapped GPIOs
3 *
4 * Copyright (c) MontaVista Software, Inc. 2008.
5 *
6 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/spinlock.h>
18#include <linux/types.h>
19#include <linux/ioport.h>
20#include <linux/io.h>
21#include <linux/of.h>
22#include <linux/of_gpio.h>
23#include <linux/gpio.h>
24#include <asm/prom.h>
25#include "simple_gpio.h"
26
27struct u8_gpio_chip {
28 struct of_mm_gpio_chip mm_gc;
29 spinlock_t lock;
30
31 /* shadowed data register to clear/set bits safely */
32 u8 data;
33};
34
35static struct u8_gpio_chip *to_u8_gpio_chip(struct of_mm_gpio_chip *mm_gc)
36{
37 return container_of(mm_gc, struct u8_gpio_chip, mm_gc);
38}
39
40static u8 u8_pin2mask(unsigned int pin)
41{
42 return 1 << (8 - 1 - pin);
43}
44
45static int u8_gpio_get(struct gpio_chip *gc, unsigned int gpio)
46{
47 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
48
49 return in_8(mm_gc->regs) & u8_pin2mask(gpio);
50}
51
52static void u8_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
53{
54 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
55 struct u8_gpio_chip *u8_gc = to_u8_gpio_chip(mm_gc);
56 unsigned long flags;
57
58 spin_lock_irqsave(&u8_gc->lock, flags);
59
60 if (val)
61 u8_gc->data |= u8_pin2mask(gpio);
62 else
63 u8_gc->data &= ~u8_pin2mask(gpio);
64
65 out_8(mm_gc->regs, u8_gc->data);
66
67 spin_unlock_irqrestore(&u8_gc->lock, flags);
68}
69
70static int u8_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
71{
72 return 0;
73}
74
75static int u8_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
76{
77 u8_gpio_set(gc, gpio, val);
78 return 0;
79}
80
81static void u8_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
82{
83 struct u8_gpio_chip *u8_gc = to_u8_gpio_chip(mm_gc);
84
85 u8_gc->data = in_8(mm_gc->regs);
86}
87
88static int __init u8_simple_gpiochip_add(struct device_node *np)
89{
90 int ret;
91 struct u8_gpio_chip *u8_gc;
92 struct of_mm_gpio_chip *mm_gc;
93 struct of_gpio_chip *of_gc;
94 struct gpio_chip *gc;
95
96 u8_gc = kzalloc(sizeof(*u8_gc), GFP_KERNEL);
97 if (!u8_gc)
98 return -ENOMEM;
99
100 spin_lock_init(&u8_gc->lock);
101
102 mm_gc = &u8_gc->mm_gc;
103 of_gc = &mm_gc->of_gc;
104 gc = &of_gc->gc;
105
106 mm_gc->save_regs = u8_gpio_save_regs;
107 of_gc->gpio_cells = 2;
108 gc->ngpio = 8;
109 gc->direction_input = u8_gpio_dir_in;
110 gc->direction_output = u8_gpio_dir_out;
111 gc->get = u8_gpio_get;
112 gc->set = u8_gpio_set;
113
114 ret = of_mm_gpiochip_add(np, mm_gc);
115 if (ret)
116 goto err;
117 return 0;
118err:
119 kfree(u8_gc);
120 return ret;
121}
122
123void __init simple_gpiochip_init(const char *compatible)
124{
125 struct device_node *np;
126
127 for_each_compatible_node(np, NULL, compatible) {
128 int ret;
129 struct resource r;
130
131 ret = of_address_to_resource(np, 0, &r);
132 if (ret)
133 goto err;
134
135 switch (resource_size(&r)) {
136 case 1:
137 ret = u8_simple_gpiochip_add(np);
138 if (ret)
139 goto err;
140 break;
141 default:
142 /*
143 * Whenever you need support for GPIO bank width > 1,
144 * please just turn u8_ code into huge macros, and
145 * construct needed uX_ code with it.
146 */
147 ret = -ENOSYS;
148 goto err;
149 }
150 continue;
151err:
152 pr_err("%s: registration failed, status %d\n",
153 np->full_name, ret);
154 }
155}
diff --git a/arch/powerpc/sysdev/simple_gpio.h b/arch/powerpc/sysdev/simple_gpio.h
new file mode 100644
index 000000000000..3a7b0c513c76
--- /dev/null
+++ b/arch/powerpc/sysdev/simple_gpio.h
@@ -0,0 +1,12 @@
1#ifndef __SYSDEV_SIMPLE_GPIO_H
2#define __SYSDEV_SIMPLE_GPIO_H
3
4#include <linux/errno.h>
5
6#ifdef CONFIG_SIMPLE_GPIO
7extern void simple_gpiochip_init(const char *compatible);
8#else
9static inline void simple_gpiochip_init(const char *compatible) {}
10#endif /* CONFIG_SIMPLE_GPIO */
11
12#endif /* __SYSDEV_SIMPLE_GPIO_H */
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-03 19:56:17 -0500