patch-2.2.18 linux/arch/arm/kernel/dma-footbridge.c

• Lines: 110
• Date: Fri Sep 15 23:28:37 2000
• Orig file: v2.2.17/arch/arm/kernel/dma-footbridge.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/arm/kernel/dma-footbridge.c linux/arch/arm/kernel/dma-footbridge.c
@@ -0,0 +1,109 @@
+/*
+ * arch/arm/kernel/dma-ebsa285.c
+ *
+ * Copyright (C) 1998 Phil Blundell
+ *
+ * DMA functions specific to EBSA-285/CATS architectures
+ *
+ * Changelog:
+ *  09-Nov-1998	RMK	Split out ISA DMA functions to dma-isa.c
+ *  17-Mar-1999	RMK	Allow any EBSA285-like architecture to have
+ *			ISA DMA controllers.
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+
+#include "dma.h"
+#include "dma-isa.h"
+
+#ifdef CONFIG_ISA_DMA
+static int has_isa_dma;
+#else
+#define has_isa_dma 0
+#endif
+
+int arch_request_dma(dmach_t channel, dma_t *dma, const char *dev_name)
+{
+	switch (channel) {
+	case _DC21285_DMA(0):
+	case _DC21285_DMA(1):	/* 21285 internal channels */
+		return 0;
+
+	case _ISA_DMA(0) ... _ISA_DMA(7):
+		if (has_isa_dma)
+			return isa_request_dma(channel - _ISA_DMA(0), dma, dev_name);
+	}
+
+	return -EINVAL;
+}
+
+void arch_free_dma(dmach_t channel, dma_t *dma)
+{
+	/* nothing to do */
+}
+
+int arch_get_dma_residue(dmach_t channel, dma_t *dma)
+{
+	int residue = 0;
+
+	switch (channel) {
+	case _DC21285_DMA(0):
+	case _DC21285_DMA(1):
+		break;
+
+	case _ISA_DMA(0) ... _ISA_DMA(7):
+		if (has_isa_dma)
+			residue = isa_get_dma_residue(channel - _ISA_DMA(0), dma);
+	}
+	return residue;
+}
+
+void arch_enable_dma(dmach_t channel, dma_t *dma)
+{
+	switch (channel) {
+	case _DC21285_DMA(0):
+	case _DC21285_DMA(1):
+		/*
+		 * Not yet implemented
+		 */
+		break;
+
+	case _ISA_DMA(0) ... _ISA_DMA(7):
+		if (has_isa_dma)
+			isa_enable_dma(channel - _ISA_DMA(0), dma);
+	}
+}
+
+void arch_disable_dma(dmach_t channel, dma_t *dma)
+{
+	switch (channel) {
+	case _DC21285_DMA(0):
+	case _DC21285_DMA(1):
+		/*
+		 * Not yet implemented
+		 */
+		break;
+
+	case _ISA_DMA(0) ... _ISA_DMA(7):
+		if (has_isa_dma)
+			isa_disable_dma(channel - _ISA_DMA(0), dma);
+	}
+}
+
+int arch_set_dma_speed(dmach_t channel, dma_t *dma, int cycle_ns)
+{
+	return 0;
+}
+
+void __init arch_dma_init(dma_t *dma)
+{
+#ifdef CONFIG_ISA_DMA
+	has_isa_dma = isa_init_dma();
+#endif
+}