1 files changed, 110 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_x1000/gpio-x1000.h b/firmware/target/mips/ingenic_x1000/gpio-x1000.h
new file mode 100644
index 0000000000..f1a65b37b5
--- /dev/null
+++ b/firmware/target/mips/ingenic_x1000/gpio-x1000.h
@@ -0,0 +1,110 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2021 Aidan MacDonald
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef __GPIO_X1000_H__
+#define __GPIO_X1000_H__
+
+/* GPIO API
+ * --------
+ *
+ * To assign a new function to a GPIO, call gpio_config(). This uses the
+ * hardware's GPIO Z facility to atomically most GPIO registers at once,
+ * so it can be used to make any state transition safely. Since GPIO Z is
+ * protected by a mutex, you can't call gpio_config() from interrupt context.
+ *
+ * If you need to use GPIO Z directly, then use gpio_lock() and gpio_unlock()
+ * to acquire the mutex.
+ *
+ * Depending on the current GPIO state, certain state transitions are safe to
+ * perform without locking, as they only change one register:
+ *
+ * - for pins in GPIO_OUTPUT state:
+ *   - use gpio_out_level() to change the output level
+ *
+ * - for pins in GPIO_IRQ_LEVEL or GPIO_IRQ_EDGE state:
+ *   - use gpio_irq_level() to change the trigger level
+ *   - use gpio_irq_mask() to mask/unmask the IRQ
+ *
+ * - for pins in GPIO_DEVICE or GPIO_INPUT state:
+ *   - no special transitions allowed
+ *
+ * - in all states:
+ *   - use gpio_set_pull() to change the pull-up/pull-down state
+ */
+
+#include "x1000/gpio.h"
+
+/* GPIO port numbers */
+#define GPIO_A 0
+#define GPIO_B 1
+#define GPIO_C 2
+#define GPIO_D 3
+#define GPIO_Z 7
+
+/* GPIO function bits */
+#define GPIO_F_PULL 16
+#define GPIO_F_INT  8
+#define GPIO_F_MASK 4
+#define GPIO_F_PAT1 2
+#define GPIO_F_PAT0 1
+
+/* GPIO function numbers */
+#define GPIO_DEVICE(i)      ((i)&3)
+#define GPIO_OUTPUT(i)      (0x4|((i)&1))
+#define GPIO_INPUT          0x16
+#define GPIO_IRQ_LEVEL(i)   (0x1c|((i)&1))
+#define GPIO_IRQ_EDGE(i)    (0x1e|((i)&1))
+
+extern void gpio_init(void);
+extern void gpio_lock(void);
+extern void gpio_unlock(void);
+extern void gpio_config(int port, unsigned pinmask, int func);
+
+static inline void gpio_out_level(int port, unsigned pinmask, int level)
+{
+    if(level)
+        jz_set(GPIO_PAT0(port), pinmask);
+    else
+        jz_clr(GPIO_PAT0(port), pinmask);
+}
+
+#define gpio_irq_level gpio_out_level
+
+static inline void gpio_irq_mask(int port, unsigned pinmask, int masked)
+{
+    if(masked)
+        jz_set(GPIO_MSK(port), pinmask);
+    else
+        jz_clr(GPIO_MSK(port), pinmask);
+}
+
+#define gpio_enable_irq(port, pinmask)  gpio_irq_mask((port), (pinmask), 0)
+#define gpio_disable_irq(port, pinmask) gpio_irq_mask((port), (pinmask), 1)
+
+static inline void gpio_set_pull(int port, unsigned pinmask, int state)
+{
+    if(state)
+        jz_set(GPIO_PULL(port), pinmask);
+    else
+        jz_clr(GPIO_PULL(port), pinmask);
+}
+
+#endif /* __GPIO_X1000_H__ */