Add BL808 GPIO Driver. Tested OK with LED

arch/risc-v/src/bl808/Make.defs

@@ -27,4 +27,4 @@ HEAD_ASRC = bl808_head.S
 # Specify our C code within this directory to be included
 CHIP_CSRCS  = bl808_start.c bl808_irq_dispatch.c bl808_irq.c
 CHIP_CSRCS += bl808_timerisr.c bl808_allocateheap.c
-CHIP_CSRCS += bl808_mm_init.c bl808_pgalloc.c bl808_serial.c
+CHIP_CSRCS += bl808_gpio.c bl808_mm_init.c bl808_pgalloc.c bl808_serial.c

arch/risc-v/src/bl808/bl808_gpio.c

@@ -0,0 +1,148 @@
+/****************************************************************************
+ * arch/risc-v/src/bl808/bl808_gpio.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+#include <sys/param.h>
+
+#include "riscv_internal.h"
+#include "hardware/bl808_glb.h"
+#include "bl808_gpio.h"
+
+////TODO
+////#define BL808_GLB_BASE        0x20000000ul  /* glb */
+#define BL808_GPIO_BASE 0x200008c4ul /* gpio */
+#define BL808_NGPIOS 45
+#define reg_gpio_xx_o 24
+#define reg_gpio_xx_i 28
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: bl808_configgpio
+ *
+ * Description:
+ *   Configure a GPIO pin based on encoded pin attributes.
+ *
+ ****************************************************************************/
+
+int bl808_configgpio(int pin, gpio_pinattr_t attr)
+{
+  uintptr_t regaddr;
+  uint32_t cfg = 0;
+
+  DEBUGASSERT(pin >= 0 && pin <= BL808_NGPIOS);
+
+  //// TODO: Change GPIO_CFGCTL0_GPIO_0_IE to GPIO_CFG_GPIO_IE
+  if (attr & GPIO_INPUT)
+    {
+      cfg |= GPIO_CFGCTL0_GPIO_0_IE;
+    }
+  else
+    {
+      cfg |= GPIO_CFGCTL0_GPIO_0_OE;
+    }
+
+  if (attr & GPIO_PULLUP)
+    {
+      cfg |= GPIO_CFGCTL0_GPIO_0_PU;
+    }
+
+  if (attr & GPIO_PULLDOWN)
+    {
+      cfg |= GPIO_CFGCTL0_GPIO_0_PD;
+    }
+
+  if (attr & GPIO_DRV_MASK)
+    {
+      cfg |= ((attr & GPIO_DRV_MASK) >> GPIO_DRV_SHIFT) <<
+        GPIO_CFGCTL0_GPIO_0_DRV_SHIFT;
+    }
+
+  if (attr & GPIO_SMT_EN)
+    {
+      cfg |= GPIO_CFGCTL0_GPIO_0_SMT;
+    }
+
+  if (attr & GPIO_FUNC_MASK)
+    {
+      cfg |= ((attr & GPIO_FUNC_MASK) >> GPIO_FUNC_SHIFT) <<
+        GPIO_CFGCTL0_GPIO_0_FUNC_SEL_SHIFT;
+    }
+
+  regaddr = BL808_GPIO_BASE + (pin * 4);
+  _info("regaddr=%p, cfg=0x%x\n", regaddr, cfg);////
+  putreg32(cfg, regaddr);
+  return OK;
+}
+
+/****************************************************************************
+ * Name: bl808_gpiowrite
+ *
+ * Description:
+ *   Write one or zero to the selected GPIO pin
+ *
+ ****************************************************************************/
+
+void bl808_gpiowrite(int pin, bool value)
+{
+  uintptr_t regaddr;
+
+  DEBUGASSERT(pin >= 0 && pin <= BL808_NGPIOS);
+
+  regaddr = BL808_GPIO_BASE + (pin * 4);
+  if (value)
+    {
+      _info("regaddr=%p, set=0x%x\n", regaddr, (1 << reg_gpio_xx_o));////
+      modifyreg32(regaddr, 0, (1 << reg_gpio_xx_o));
+    }
+  else
+    {
+      _info("regaddr=%p, clear=0x%x\n", regaddr, (1 << reg_gpio_xx_o));////
+      modifyreg32(regaddr, (1 << reg_gpio_xx_o), 0);
+    }
+}
+
+/****************************************************************************
+ * Name: bl808_gpioread
+ *
+ * Description:
+ *   Read one or zero from the selected GPIO pin
+ *
+ ****************************************************************************/
+
+bool bl808_gpioread(int pin)
+{
+  uintptr_t regaddr;
+  uint32_t regval;
+
+  DEBUGASSERT(pin >= 0 && pin <= BL808_NGPIOS);
+
+  regaddr = BL808_GPIO_BASE + (pin * 4);
+  regval = getreg32(regaddr);
+  return (regval & (1 << reg_gpio_xx_i)) != 0;
+}

arch/risc-v/src/bl808/bl808_gpio.h

@@ -0,0 +1,188 @@
+/****************************************************************************
+ * arch/risc-v/src/bl808/bl808_gpio.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_RISCV_SRC_BL808_BL808_GPIO_H
+#define __ARCH_RISCV_SRC_BL808_BL808_GPIO_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Pre-Processor Declarations
+ ****************************************************************************/
+
+/* Encoded GPIO Attributes
+ *
+ * 1111 1100 0000 0000
+ * 5432 1098 7654 3210
+ * ---- ---- ---- ----
+ * .... ..MU UDDS FFFF
+ */
+
+/* Mode:
+ *
+ * 1111 1100 0000 0000
+ * 5432 1098 7654 3210
+ * ---- ---- ---- ----
+ * .... ..M. .... ....
+ */
+
+#define GPIO_MODE_SHIFT  (9)                     /* Bit 9: Port Mode */
+#define GPIO_MODE_MASK   (1 << GPIO_MODE_SHIFT)
+#  define GPIO_INPUT     (1 << GPIO_MODE_SHIFT)  /* Input Enable */
+#  define GPIO_OUTPUT    (0 << GPIO_MODE_SHIFT)  /* Output Enable */
+
+/* Input/Output pull-ups/downs:
+ *
+ * 1111 1100 0000 0000
+ * 5432 1098 7654 3210
+ * ---- ---- ---- ----
+ * .... ...U U... ....
+ */
+
+#define GPIO_PUPD_SHIFT (7) /* Bits 7-8: Pull-up/down */
+#define GPIO_PUPD_MASK  (3 << GPIO_PUPD_SHIFT)
+#define GPIO_FLOAT      (0 << GPIO_PUPD_SHIFT) /* No pull-up, pull-down */
+#define GPIO_PULLUP     (1 << GPIO_PUPD_SHIFT) /* Pull-up */
+#define GPIO_PULLDOWN   (2 << GPIO_PUPD_SHIFT) /* Pull-down */
+
+/* Drive:
+ *
+ * 1111 1100 0000 0000
+ * 5432 1098 7654 3210
+ * ---- ---- ---- ----
+ * .... .... .DD. ....
+ */
+
+#define GPIO_DRV_SHIFT (5) /* Bits 5-6: Drive */
+#define GPIO_DRV_MASK  (3 << GPIO_DRV_SHIFT)
+#define GPIO_DRV_0     (0 << GPIO_DRV_SHIFT)
+#define GPIO_DRV_1     (1 << GPIO_DRV_SHIFT)
+#define GPIO_DRV_2     (2 << GPIO_DRV_SHIFT)
+#define GPIO_DRV_3     (3 << GPIO_DRV_SHIFT)
+
+/* Input Schmitt trigger:
+ *
+ * 1111 1100 0000 0000
+ * 5432 1098 7654 3210
+ * ---- ---- ---- ----
+ * .... .... ...S ....
+ */
+
+#define GPIO_SMT_SHIFT (4) /* Bit 4: SMT Enable */
+#define GPIO_SMT_MASK  (3 << GPIO_SMT_SHIFT)
+#define GPIO_SMT_DIS   (0 << GPIO_SMT_SHIFT)
+#define GPIO_SMT_EN    (1 << GPIO_SMT_SHIFT)
+
+/* GPIO type selection:
+ *
+ * 1111 1100 0000 0000
+ * 5432 1098 7654 3210
+ * ---- ---- ---- ----
+ * .... .... .... FFFF
+ */
+
+#define GPIO_FUNC_SHIFT  (0) /* Bits 0-3: GPIO Type */
+#define GPIO_FUNC_MASK   (15 << GPIO_FUNC_SHIFT)
+#define GPIO_FUNC_SDIO   (1  << GPIO_FUNC_SHIFT)  /* SDIO */
+#define GPIO_FUNC_FLASH  (2  << GPIO_FUNC_SHIFT)  /* Flash */
+#define GPIO_FUNC_SPI    (4  << GPIO_FUNC_SHIFT)  /* SPI */
+#define GPIO_FUNC_I2C    (6  << GPIO_FUNC_SHIFT)  /* I2C */
+#define GPIO_FUNC_UART   (7  << GPIO_FUNC_SHIFT)  /* UART */
+#define GPIO_FUNC_PWM    (8  << GPIO_FUNC_SHIFT)  /* PWM */
+#define GPIO_FUNC_EXT_PA (9  << GPIO_FUNC_SHIFT)  /* Analog */
+#define GPIO_FUNC_ANA    (10 << GPIO_FUNC_SHIFT) /* Analog */
+#define GPIO_FUNC_SWGPIO (11 << GPIO_FUNC_SHIFT) /* Software GPIO */
+#define GPIO_FUNC_JTAG   (14 << GPIO_FUNC_SHIFT) /* JTAG */
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/* Must be big enough to hold the above encodings */
+
+typedef uint16_t gpio_pinattr_t;
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: bl808_configgpio
+ *
+ * Description:
+ *   Configure a GPIO pin based on encoded pin attributes.
+ *
+ ****************************************************************************/
+
+int bl808_configgpio(int pin, gpio_pinattr_t attr);
+
+/****************************************************************************
+ * Name: bl808_gpiowrite
+ *
+ * Description:
+ *   Write one or zero to the selected GPIO pin
+ *
+ ****************************************************************************/
+
+void bl808_gpiowrite(int pin, bool value);
+
+/****************************************************************************
+ * Name: bl808_gpioread
+ *
+ * Description:
+ *   Read one or zero from the selected GPIO pin
+ *
+ ****************************************************************************/
+
+bool bl808_gpioread(int pin);
+
+#ifdef __cplusplus
+}
+#endif
+#undef EXTERN
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_RISCV_SRC_BL808_BL808_GPIO_H */