Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / scx200_gpio.h

diff --git a/kernel/include/linux/scx200_gpio.h b/kernel/include/linux/scx200_gpio.h
new file mode 100644 (file)
index 0000000..ece4e55
--- /dev/null
+++ b/kernel/include/linux/scx200_gpio.h
@@ -0,0 +1,88 @@
+u32 scx200_gpio_configure(unsigned index, u32 set, u32 clear);
+
+extern unsigned scx200_gpio_base;
+extern unsigned long scx200_gpio_shadow[2];
+extern struct nsc_gpio_ops scx200_gpio_ops;
+
+#define scx200_gpio_present() (scx200_gpio_base!=0)
+
+/* Definitions to make sure I do the same thing in all functions */
+#define __SCx200_GPIO_BANK unsigned bank = index>>5
+#define __SCx200_GPIO_IOADDR unsigned short ioaddr = scx200_gpio_base+0x10*bank
+#define __SCx200_GPIO_SHADOW unsigned long *shadow = scx200_gpio_shadow+bank
+#define __SCx200_GPIO_INDEX index &= 31
+
+#define __SCx200_GPIO_OUT __asm__ __volatile__("outsl":"=mS" (shadow):"d" (ioaddr), "0" (shadow))
+
+/* returns the value of the GPIO pin */
+
+static inline int scx200_gpio_get(unsigned index) {
+       __SCx200_GPIO_BANK;
+       __SCx200_GPIO_IOADDR + 0x04;
+       __SCx200_GPIO_INDEX;
+               
+       return (inl(ioaddr) & (1<<index)) ? 1 : 0;
+}
+
+/* return the value driven on the GPIO signal (the value that will be
+   driven if the GPIO is configured as an output, it might not be the
+   state of the GPIO right now if the GPIO is configured as an input) */
+
+static inline int scx200_gpio_current(unsigned index) {
+        __SCx200_GPIO_BANK;
+       __SCx200_GPIO_INDEX;
+               
+       return (scx200_gpio_shadow[bank] & (1<<index)) ? 1 : 0;
+}
+
+/* drive the GPIO signal high */
+
+static inline void scx200_gpio_set_high(unsigned index) {
+       __SCx200_GPIO_BANK;
+       __SCx200_GPIO_IOADDR;
+       __SCx200_GPIO_SHADOW;
+       __SCx200_GPIO_INDEX;
+       set_bit(index, shadow); /* __set_bit()? */
+       __SCx200_GPIO_OUT;
+}
+
+/* drive the GPIO signal low */
+
+static inline void scx200_gpio_set_low(unsigned index) {
+       __SCx200_GPIO_BANK;
+       __SCx200_GPIO_IOADDR;
+       __SCx200_GPIO_SHADOW;
+       __SCx200_GPIO_INDEX;
+       clear_bit(index, shadow); /* __clear_bit()? */
+       __SCx200_GPIO_OUT;
+}
+
+/* drive the GPIO signal to state */
+
+static inline void scx200_gpio_set(unsigned index, int state) {
+       __SCx200_GPIO_BANK;
+       __SCx200_GPIO_IOADDR;
+       __SCx200_GPIO_SHADOW;
+       __SCx200_GPIO_INDEX;
+       if (state)
+               set_bit(index, shadow);
+       else
+               clear_bit(index, shadow);
+       __SCx200_GPIO_OUT;
+}
+
+/* toggle the GPIO signal */
+static inline void scx200_gpio_change(unsigned index) {
+       __SCx200_GPIO_BANK;
+       __SCx200_GPIO_IOADDR;
+       __SCx200_GPIO_SHADOW;
+       __SCx200_GPIO_INDEX;
+       change_bit(index, shadow);
+       __SCx200_GPIO_OUT;
+}
+
+#undef __SCx200_GPIO_BANK
+#undef __SCx200_GPIO_IOADDR
+#undef __SCx200_GPIO_SHADOW
+#undef __SCx200_GPIO_INDEX
+#undef __SCx200_GPIO_OUT