waterDataDiscreteRateMining standardDeviationMemoryDefinition.c 姚强 commit at 2020-10-26

waterDataDiscreteRateMining/dataSharedMemory/standardDeviationMemoryDefinition.c

@@ -0,0 +1,156 @@
+/*
+ * bfin_dma.c - Blackfin DMA implementation
+ *
+ * Copyright 2004-2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/param.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+
+#include <asm/blackfin.h>
+#include <asm/cacheflush.h>
+#include <asm/dma.h>
+#include <asm/uaccess.h>
+#include <asm/early_printk.h>
+
+/*
+ * To make sure we work around 05000119 - we always check DMA_DONE bit,
+ * never the DMA_RUN bit
+ */
+
+struct dma_channel dma_ch[MAX_DMA_CHANNELS];
+EXPORT_SYMBOL(dma_ch);
+
+static int __init blackfin_dma_init(void)
+{
+	int i;
+
+	printk(KERN_INFO "Blackfin DMA Controller\n");
+
+
+#if ANOMALY_05000480
+	bfin_write_DMAC_TC_PER(0x0111);
+#endif
+
+	for (i = 0; i < MAX_DMA_CHANNELS; i++) {
+		atomic_set(&dma_ch[i].chan_status, 0);
+		dma_ch[i].regs = dma_io_base_addr[i];
+	}
+#if defined(CH_MEM_STREAM3_SRC) && defined(CONFIG_BF60x)
+	/* Mark MEMDMA Channel 3 as requested since we're using it internally */
+	request_dma(CH_MEM_STREAM3_DEST, "Blackfin dma_memcpy");
+	request_dma(CH_MEM_STREAM3_SRC, "Blackfin dma_memcpy");
+#else
+	/* Mark MEMDMA Channel 0 as requested since we're using it internally */
+	request_dma(CH_MEM_STREAM0_DEST, "Blackfin dma_memcpy");
+	request_dma(CH_MEM_STREAM0_SRC, "Blackfin dma_memcpy");
+#endif
+
+#if defined(CONFIG_DEB_DMA_URGENT)
+	bfin_write_EBIU_DDRQUE(bfin_read_EBIU_DDRQUE()
+			 | DEB1_URGENT | DEB2_URGENT | DEB3_URGENT);
+#endif
+
+	return 0;
+}
+arch_initcall(blackfin_dma_init);
+
+#ifdef CONFIG_PROC_FS
+static int proc_dma_show(struct seq_file *m, void *v)
+{
+	int i;
+
+	for (i = 0; i < MAX_DMA_CHANNELS; ++i)
+		if (dma_channel_active(i))
+			seq_printf(m, "%2d: %s\n", i, dma_ch[i].device_id);
+
+	return 0;
+}
+
+static int proc_dma_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, proc_dma_show, NULL);
+}
+
+static const struct file_operations proc_dma_operations = {
+	.open		= proc_dma_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init proc_dma_init(void)
+{
+	proc_create("dma", 0, NULL, &proc_dma_operations);
+	return 0;
+}
+late_initcall(proc_dma_init);
+#endif
+
+static void set_dma_peripheral_map(unsigned int channel, const char *device_id)
+{
+#ifdef CONFIG_BF54x
+	unsigned int per_map;
+
+	switch (channel) {
+		case CH_UART2_RX: per_map = 0xC << 12; break;
+		case CH_UART2_TX: per_map = 0xD << 12; break;
+		case CH_UART3_RX: per_map = 0xE << 12; break;
+		case CH_UART3_TX: per_map = 0xF << 12; break;
+		default:          return;
+	}
+
+	if (strncmp(device_id, "BFIN_UART", 9) == 0)
+		dma_ch[channel].regs->peripheral_map = per_map;
+#endif
+}
+
+/**
+ *	request_dma - request a DMA channel
+ *
+ * Request the specific DMA channel from the system if it's available.
+ */
+int request_dma(unsigned int channel, const char *device_id)
+{
+	pr_debug("request_dma() : BEGIN\n");
+
+	if (device_id == NULL)
+		printk(KERN_WARNING "request_dma(%u): no device_id given\n", channel);
+
+#if defined(CONFIG_BF561) && ANOMALY_05000182
+	if (channel >= CH_IMEM_STREAM0_DEST && channel <= CH_IMEM_STREAM1_DEST) {
+		if (get_cclk() > 500000000) {
+			printk(KERN_WARNING
+			       "Request IMDMA failed due to ANOMALY 05000182\n");
+			return -EFAULT;
+		}
+	}
+#endif
+
+	if (atomic_cmpxchg(&dma_ch[channel].chan_status, 0, 1)) {
+		pr_debug("DMA CHANNEL IN USE\n");
+		return -EBUSY;
+	}
+
+	set_dma_peripheral_map(channel, device_id);
+	dma_ch[channel].device_id = device_id;
+	dma_ch[channel].irq = 0;
+
+	/* This is to be enabled by putting a restriction -
+	 * you have to request DMA, before doing any operations on
+	 * descriptor/channel
+	 */
+	pr_debug("request_dma() : END\n");
+	return 0;
+}
+EXPORT_SYMBOL(request_dma);
+