waterHeterogeneousDataSynchronization preliminaryDataProcessing.c 姚强 commit at 2020-10-16

waterHeterogeneousDataSynchronization/monitoringDataProcessing/preliminaryDataProcessing.c

@@ -0,0 +1,110 @@
+/*
+ * Atmel PIO2 Port Multiplexer support
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/debugfs.h>
+#include <linux/export.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+
+#include <asm/gpio.h>
+#include <asm/io.h>
+
+#include <mach/portmux.h>
+
+#include "pio.h"
+
+#define MAX_NR_PIO_DEVICES		8
+
+struct pio_device {
+	struct gpio_chip chip;
+	void __iomem *regs;
+	const struct platform_device *pdev;
+	struct clk *clk;
+	u32 pinmux_mask;
+	char name[8];
+};
+
+static struct pio_device pio_dev[MAX_NR_PIO_DEVICES];
+
+static struct pio_device *gpio_to_pio(unsigned int gpio)
+{
+	struct pio_device *pio;
+	unsigned int index;
+
+	index = gpio >> 5;
+	if (index >= MAX_NR_PIO_DEVICES)
+		return NULL;
+	pio = &pio_dev[index];
+	if (!pio->regs)
+		return NULL;
+
+	return pio;
+}
+
+/* Pin multiplexing API */
+static DEFINE_SPINLOCK(pio_lock);
+
+void __init at32_select_periph(unsigned int port, u32 pin_mask,
+			       unsigned int periph, unsigned long flags)
+{
+	struct pio_device *pio;
+
+	/* assign and verify pio */
+	pio = gpio_to_pio(port);
+	if (unlikely(!pio)) {
+		printk(KERN_WARNING "pio: invalid port %u\n", port);
+		goto fail;
+	}
+
+	/* Test if any of the requested pins is already muxed */
+	spin_lock(&pio_lock);
+	if (unlikely(pio->pinmux_mask & pin_mask)) {
+		printk(KERN_WARNING "%s: pin(s) busy (requested 0x%x, busy 0x%x)\n",
+		       pio->name, pin_mask, pio->pinmux_mask & pin_mask);
+		spin_unlock(&pio_lock);
+		goto fail;
+	}
+
+	pio->pinmux_mask |= pin_mask;
+
+	/* enable pull ups */
+	pio_writel(pio, PUER, pin_mask);
+
+	/* select either peripheral A or B */
+	if (periph)
+		pio_writel(pio, BSR, pin_mask);
+	else
+		pio_writel(pio, ASR, pin_mask);
+
+	/* enable peripheral control */
+	pio_writel(pio, PDR, pin_mask);
+
+	/* Disable pull ups if not requested. */
+	if (!(flags & AT32_GPIOF_PULLUP))
+		pio_writel(pio, PUDR, pin_mask);
+
+	spin_unlock(&pio_lock);
+
+	return;
+
+fail:
+	dump_stack();
+}
+
+void __init at32_select_gpio(unsigned int pin, unsigned long flags)
+{
+	struct pio_device *pio;
+	unsigned int pin_index = pin & 0x1f;
+	u32 mask = 1 << pin_index;
+
+	pio = gpio_to_pio(pin);
+	if (unlikely(!pio)) {