2 * Miscellaneous functions for IDT EB434 board
4 * Copyright 2004 IDT Inc. (rischelp@idt.com)
5 * Copyright 2006 Phil Sutter <n0-1@freewrt.org>
6 * Copyright 2007 Florian Fainelli <florian@openwrt.org>
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.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
16 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
19 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/kernel.h>
30 #include <linux/init.h>
31 #include <linux/types.h>
32 #include <linux/spinlock.h>
33 #include <linux/platform_device.h>
34 #include <linux/gpio.h>
36 #include <asm/mach-rc32434/rb.h>
37 #include <asm/mach-rc32434/gpio.h>
39 struct rb532_gpio_chip {
40 struct gpio_chip chip;
41 void __iomem *regbase;
42 void (*set_int_level)(struct gpio_chip *chip, unsigned offset, int value);
43 int (*get_int_level)(struct gpio_chip *chip, unsigned offset);
44 void (*set_int_status)(struct gpio_chip *chip, unsigned offset, int value);
45 int (*get_int_status)(struct gpio_chip *chip, unsigned offset);
48 struct mpmc_device dev3;
50 static struct resource rb532_gpio_reg0_res[] = {
53 .start = REGBASE + GPIOBASE,
54 .end = REGBASE + GPIOBASE + sizeof(struct rb532_gpio_reg) - 1,
55 .flags = IORESOURCE_MEM,
59 static struct resource rb532_dev3_ctl_res[] = {
62 .start = REGBASE + DEV3BASE,
63 .end = REGBASE + DEV3BASE + sizeof(struct dev_reg) - 1,
64 .flags = IORESOURCE_MEM,
68 void set_434_reg(unsigned reg_offs, unsigned bit, unsigned len, unsigned val)
74 spin_lock_irqsave(&dev3.lock, flags);
76 data = readl(IDT434_REG_BASE + reg_offs);
77 for (i = 0; i != len; ++i) {
79 data |= (1 << (i + bit));
81 data &= ~(1 << (i + bit));
83 writel(data, (IDT434_REG_BASE + reg_offs));
85 spin_unlock_irqrestore(&dev3.lock, flags);
87 EXPORT_SYMBOL(set_434_reg);
89 unsigned get_434_reg(unsigned reg_offs)
91 return readl(IDT434_REG_BASE + reg_offs);
93 EXPORT_SYMBOL(get_434_reg);
95 void set_latch_u5(unsigned char or_mask, unsigned char nand_mask)
99 spin_lock_irqsave(&dev3.lock, flags);
101 dev3.state = (dev3.state | or_mask) & ~nand_mask;
102 writel(dev3.state, &dev3.base);
104 spin_unlock_irqrestore(&dev3.lock, flags);
106 EXPORT_SYMBOL(set_latch_u5);
108 unsigned char get_latch_u5(void)
112 EXPORT_SYMBOL(get_latch_u5);
115 * Return GPIO level */
116 static int rb532_gpio_get(struct gpio_chip *chip, unsigned offset)
118 u32 mask = 1 << offset;
119 struct rb532_gpio_chip *gpch;
121 gpch = container_of(chip, struct rb532_gpio_chip, chip);
122 return readl(gpch->regbase + GPIOD) & mask;
126 * Set output GPIO level
128 static void rb532_gpio_set(struct gpio_chip *chip,
129 unsigned offset, int value)
132 u32 mask = 1 << offset;
134 struct rb532_gpio_chip *gpch;
137 gpch = container_of(chip, struct rb532_gpio_chip, chip);
138 gpvr = gpch->regbase + GPIOD;
140 local_irq_save(flags);
147 local_irq_restore(flags);
151 * Set GPIO direction to input
153 static int rb532_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
156 u32 mask = 1 << offset;
158 struct rb532_gpio_chip *gpch;
161 gpch = container_of(chip, struct rb532_gpio_chip, chip);
162 gpdr = gpch->regbase + GPIOCFG;
164 local_irq_save(flags);
168 local_irq_restore(flags);
174 * Set GPIO direction to output
176 static int rb532_gpio_direction_output(struct gpio_chip *chip,
177 unsigned offset, int value)
180 u32 mask = 1 << offset;
182 struct rb532_gpio_chip *gpch;
185 gpch = container_of(chip, struct rb532_gpio_chip, chip);
186 writel(mask, gpch->regbase + GPIOD);
187 gpdr = gpch->regbase + GPIOCFG;
189 local_irq_save(flags);
193 local_irq_restore(flags);
199 * Set the GPIO interrupt level
201 static void rb532_gpio_set_int_level(struct gpio_chip *chip,
202 unsigned offset, int value)
205 u32 mask = 1 << offset;
207 struct rb532_gpio_chip *gpch;
210 gpch = container_of(chip, struct rb532_gpio_chip, chip);
211 gpil = gpch->regbase + GPIOILEVEL;
213 local_irq_save(flags);
220 local_irq_restore(flags);
224 * Get the GPIO interrupt level
226 static int rb532_gpio_get_int_level(struct gpio_chip *chip, unsigned offset)
228 u32 mask = 1 << offset;
229 struct rb532_gpio_chip *gpch;
231 gpch = container_of(chip, struct rb532_gpio_chip, chip);
232 return readl(gpch->regbase + GPIOILEVEL) & mask;
236 * Set the GPIO interrupt status
238 static void rb532_gpio_set_int_status(struct gpio_chip *chip,
239 unsigned offset, int value)
242 u32 mask = 1 << offset;
244 struct rb532_gpio_chip *gpch;
247 gpch = container_of(chip, struct rb532_gpio_chip, chip);
248 gpis = gpch->regbase + GPIOISTAT;
250 local_irq_save(flags);
257 local_irq_restore(flags);
261 * Get the GPIO interrupt status
263 static int rb532_gpio_get_int_status(struct gpio_chip *chip, unsigned offset)
265 u32 mask = 1 << offset;
266 struct rb532_gpio_chip *gpch;
268 gpch = container_of(chip, struct rb532_gpio_chip, chip);
269 return readl(gpch->regbase + GPIOISTAT) & mask;
272 static struct rb532_gpio_chip rb532_gpio_chip[] = {
276 .direction_input = rb532_gpio_direction_input,
277 .direction_output = rb532_gpio_direction_output,
278 .get = rb532_gpio_get,
279 .set = rb532_gpio_set,
283 .get_int_level = rb532_gpio_get_int_level,
284 .set_int_level = rb532_gpio_set_int_level,
285 .get_int_status = rb532_gpio_get_int_status,
286 .set_int_status = rb532_gpio_set_int_status,
290 int __init rb532_gpio_init(void)
294 r = rb532_gpio_reg0_res;
295 rb532_gpio_chip->regbase = ioremap_nocache(r->start, r->end - r->start);
297 if (!rb532_gpio_chip->regbase) {
298 printk(KERN_ERR "rb532: cannot remap GPIO register 0\n");
302 /* Register our GPIO chip */
303 gpiochip_add(&rb532_gpio_chip->chip);
305 r = rb532_dev3_ctl_res;
306 dev3.base = ioremap_nocache(r->start, r->end - r->start);
309 printk(KERN_ERR "rb532: cannot remap device controller 3\n");
313 /* Set the interrupt status and level for the CF pin */
314 rb532_gpio_set_int_level(&rb532_gpio_chip->chip, CF_GPIO_NUM, 1);
315 rb532_gpio_set_int_status(&rb532_gpio_chip->chip, CF_GPIO_NUM, 0);
319 arch_initcall(rb532_gpio_init);