summaryrefslogtreecommitdiffstats
path: root/arch/mips/include/asm/mach-au1x00/gpio-au1300.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/include/asm/mach-au1x00/gpio-au1300.h')
-rw-r--r--arch/mips/include/asm/mach-au1x00/gpio-au1300.h241
1 files changed, 241 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-au1x00/gpio-au1300.h b/arch/mips/include/asm/mach-au1x00/gpio-au1300.h
new file mode 100644
index 00000000000..556e1be20bf
--- /dev/null
+++ b/arch/mips/include/asm/mach-au1x00/gpio-au1300.h
@@ -0,0 +1,241 @@
+/*
+ * gpio-au1300.h -- GPIO control for Au1300 GPIC and compatibles.
+ *
+ * Copyright (c) 2009-2011 Manuel Lauss <manuel.lauss@googlemail.com>
+ */
+
+#ifndef _GPIO_AU1300_H_
+#define _GPIO_AU1300_H_
+
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/mach-au1x00/au1000.h>
+
+/* with the current GPIC design, up to 128 GPIOs are possible.
+ * The only implementation so far is in the Au1300, which has 75 externally
+ * available GPIOs.
+ */
+#define AU1300_GPIO_BASE 0
+#define AU1300_GPIO_NUM 75
+#define AU1300_GPIO_MAX (AU1300_GPIO_BASE + AU1300_GPIO_NUM - 1)
+
+#define AU1300_GPIC_ADDR \
+ (void __iomem *)KSEG1ADDR(AU1300_GPIC_PHYS_ADDR)
+
+static inline int au1300_gpio_get_value(unsigned int gpio)
+{
+ void __iomem *roff = AU1300_GPIC_ADDR;
+ int bit;
+
+ gpio -= AU1300_GPIO_BASE;
+ roff += GPIC_GPIO_BANKOFF(gpio);
+ bit = GPIC_GPIO_TO_BIT(gpio);
+ return __raw_readl(roff + AU1300_GPIC_PINVAL) & bit;
+}
+
+static inline int au1300_gpio_direction_input(unsigned int gpio)
+{
+ void __iomem *roff = AU1300_GPIC_ADDR;
+ unsigned long bit;
+
+ gpio -= AU1300_GPIO_BASE;
+
+ roff += GPIC_GPIO_BANKOFF(gpio);
+ bit = GPIC_GPIO_TO_BIT(gpio);
+ __raw_writel(bit, roff + AU1300_GPIC_DEVCLR);
+ wmb();
+
+ return 0;
+}
+
+static inline int au1300_gpio_set_value(unsigned int gpio, int v)
+{
+ void __iomem *roff = AU1300_GPIC_ADDR;
+ unsigned long bit;
+
+ gpio -= AU1300_GPIO_BASE;
+
+ roff += GPIC_GPIO_BANKOFF(gpio);
+ bit = GPIC_GPIO_TO_BIT(gpio);
+ __raw_writel(bit, roff + (v ? AU1300_GPIC_PINVAL
+ : AU1300_GPIC_PINVALCLR));
+ wmb();
+
+ return 0;
+}
+
+static inline int au1300_gpio_direction_output(unsigned int gpio, int v)
+{
+ /* hw switches to output automatically */
+ return au1300_gpio_set_value(gpio, v);
+}
+
+static inline int au1300_gpio_to_irq(unsigned int gpio)
+{
+ return AU1300_FIRST_INT + (gpio - AU1300_GPIO_BASE);
+}
+
+static inline int au1300_irq_to_gpio(unsigned int irq)
+{
+ return (irq - AU1300_FIRST_INT) + AU1300_GPIO_BASE;
+}
+
+static inline int au1300_gpio_is_valid(unsigned int gpio)
+{
+ int ret;
+
+ switch (alchemy_get_cputype()) {
+ case ALCHEMY_CPU_AU1300:
+ ret = ((gpio >= AU1300_GPIO_BASE) && (gpio <= AU1300_GPIO_MAX));
+ break;
+ default:
+ ret = 0;
+ }
+ return ret;
+}
+
+static inline int au1300_gpio_cansleep(unsigned int gpio)
+{
+ return 0;
+}
+
+/* hardware remembers gpio 0-63 levels on powerup */
+static inline int au1300_gpio_getinitlvl(unsigned int gpio)
+{
+ void __iomem *roff = AU1300_GPIC_ADDR;
+ unsigned long v;
+
+ if (unlikely(gpio > 63))
+ return 0;
+ else if (gpio > 31) {
+ gpio -= 32;
+ roff += 4;
+ }
+
+ v = __raw_readl(roff + AU1300_GPIC_RSTVAL);
+ return (v >> gpio) & 1;
+}
+
+/**********************************************************************/
+
+/* Linux gpio framework integration.
+*
+* 4 use cases of Alchemy GPIOS:
+*(1) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=y:
+* Board must register gpiochips.
+*(2) GPIOLIB=y, ALCHEMY_GPIO_INDIRECT=n:
+* A gpiochip for the 75 GPIOs is registered.
+*
+*(3) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=y:
+* the boards' gpio.h must provide the linux gpio wrapper functions,
+*
+*(4) GPIOLIB=n, ALCHEMY_GPIO_INDIRECT=n:
+* inlinable gpio functions are provided which enable access to the
+* Au1300 gpios only by using the numbers straight out of the data-
+* sheets.
+
+* Cases 1 and 3 are intended for boards which want to provide their own
+* GPIO namespace and -operations (i.e. for example you have 8 GPIOs
+* which are in part provided by spare Au1300 GPIO pins and in part by
+* an external FPGA but you still want them to be accssible in linux
+* as gpio0-7. The board can of course use the alchemy_gpioX_* functions
+* as required).
+*/
+
+#ifndef CONFIG_GPIOLIB
+
+#ifdef CONFIG_ALCHEMY_GPIOINT_AU1300
+
+#ifndef CONFIG_ALCHEMY_GPIO_INDIRECT /* case (4) */
+
+static inline int gpio_direction_input(unsigned int gpio)
+{
+ return au1300_gpio_direction_input(gpio);
+}
+
+static inline int gpio_direction_output(unsigned int gpio, int v)
+{
+ return au1300_gpio_direction_output(gpio, v);
+}
+
+static inline int gpio_get_value(unsigned int gpio)
+{
+ return au1300_gpio_get_value(gpio);
+}
+
+static inline void gpio_set_value(unsigned int gpio, int v)
+{
+ au1300_gpio_set_value(gpio, v);
+}
+
+static inline int gpio_get_value_cansleep(unsigned gpio)
+{
+ return gpio_get_value(gpio);
+}
+
+static inline void gpio_set_value_cansleep(unsigned gpio, int value)
+{
+ gpio_set_value(gpio, value);
+}
+
+static inline int gpio_is_valid(unsigned int gpio)
+{
+ return au1300_gpio_is_valid(gpio);
+}
+
+static inline int gpio_cansleep(unsigned int gpio)
+{
+ return au1300_gpio_cansleep(gpio);
+}
+
+static inline int gpio_to_irq(unsigned int gpio)
+{
+ return au1300_gpio_to_irq(gpio);
+}
+
+static inline int irq_to_gpio(unsigned int irq)
+{
+ return au1300_irq_to_gpio(irq);
+}
+
+static inline int gpio_request(unsigned int gpio, const char *label)
+{
+ return 0;
+}
+
+static inline void gpio_free(unsigned int gpio)
+{
+}
+
+static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
+{
+ return -ENOSYS;
+}
+
+static inline void gpio_unexport(unsigned gpio)
+{
+}
+
+static inline int gpio_export(unsigned gpio, bool direction_may_change)
+{
+ return -ENOSYS;
+}
+
+static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
+{
+ return -ENOSYS;
+}
+
+static inline int gpio_export_link(struct device *dev, const char *name,
+ unsigned gpio)
+{
+ return -ENOSYS;
+}
+
+#endif /* !CONFIG_ALCHEMY_GPIO_INDIRECT */
+
+#endif /* CONFIG_ALCHEMY_GPIOINT_AU1300 */
+
+#endif /* CONFIG GPIOLIB */
+
+#endif /* _GPIO_AU1300_H_ */