waterHeterogeneousDataSynchronization memoryOperation.c 姚强 commit at 2021-01-13

waterHeterogeneousDataSynchronization/dataSharedMemory/memoryOperation.c

@@ -1235,3 +1235,76 @@ static void s3c2410_dma_resume_chan(struct s3c2410_dma_chan *cp)
 
 	printk(KERN_INFO "dma%d: restoring configuration\n", cp->number);
 
+	s3c2410_dma_config(no, cp->xfer_unit);
+	s3c2410_dma_devconfig(no, cp->source, cp->dev_addr);
+
+	/* re-select the dma source for this channel */
+
+	if (cp->map != NULL)
+		dma_sel.select(cp, cp->map);
+}
+
+static void s3c2410_dma_resume(void)
+{
+	struct s3c2410_dma_chan *cp = s3c2410_chans + dma_channels - 1;
+	int channel;
+
+	for (channel = dma_channels - 1; channel >= 0; cp--, channel--)
+		s3c2410_dma_resume_chan(cp);
+}
+
+#else
+#define s3c2410_dma_suspend NULL
+#define s3c2410_dma_resume  NULL
+#endif /* CONFIG_PM */
+
+struct syscore_ops dma_syscore_ops = {
+	.suspend	= s3c2410_dma_suspend,
+	.resume		= s3c2410_dma_resume,
+};
+
+/* kmem cache implementation */
+
+static void s3c2410_dma_cache_ctor(void *p)
+{
+	memset(p, 0, sizeof(struct s3c2410_dma_buf));
+}
+
+/* initialisation code */
+
+static int __init s3c24xx_dma_syscore_init(void)
+{
+	register_syscore_ops(&dma_syscore_ops);
+
+	return 0;
+}
+
+late_initcall(s3c24xx_dma_syscore_init);
+
+int __init s3c24xx_dma_init(unsigned int channels, unsigned int irq,
+			    unsigned int stride)
+{
+	struct s3c2410_dma_chan *cp;
+	int channel;
+	int ret;
+
+	printk("S3C24XX DMA Driver, Copyright 2003-2006 Simtec Electronics\n");
+
+	dma_channels = channels;
+
+	dma_base = ioremap(S3C24XX_PA_DMA, stride * channels);
+	if (dma_base == NULL) {
+		printk(KERN_ERR "dma failed to remap register block\n");
+		return -ENOMEM;
+	}
+
+	dma_kmem = kmem_cache_create("dma_desc",
+				     sizeof(struct s3c2410_dma_buf), 0,
+				     SLAB_HWCACHE_ALIGN,
+				     s3c2410_dma_cache_ctor);
+
+	if (dma_kmem == NULL) {
+		printk(KERN_ERR "dma failed to make kmem cache\n");
+		ret = -ENOMEM;
+		goto err;
+	}