From cb96ac9be7c298f0e0634a048d938b68a3f57ed0 Mon Sep 17 00:00:00 2001
From: asterix <asterix@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Tue, 6 Sep 2011 15:15:06 +0000
Subject: [PATCH] Add dmac driver for sam3x.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@5035 38d2e660-2303-0410-9eaa-f027e97ec537
---
 bertos/cpu/cortex-m3/drv/dmac_sam3.c | 180 +++++++++++++++++++++++++++
 bertos/cpu/cortex-m3/drv/dmac_sam3.h |  73 +++++++++++
 2 files changed, 253 insertions(+)
 create mode 100644 bertos/cpu/cortex-m3/drv/dmac_sam3.c
 create mode 100644 bertos/cpu/cortex-m3/drv/dmac_sam3.h

diff --git a/bertos/cpu/cortex-m3/drv/dmac_sam3.c b/bertos/cpu/cortex-m3/drv/dmac_sam3.c
new file mode 100644
index 00000000..21045b7f
--- /dev/null
+++ b/bertos/cpu/cortex-m3/drv/dmac_sam3.c
@@ -0,0 +1,180 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2011 Develer S.r.l. (http://www.develer.com/)
+ * -->
+ *
+ * \brief HSMCI driver implementation.
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#include "dmac_sam3.h"
+
+#include "hsmci_sam3.h"
+#include "hw/hw_sd.h"
+
+#include <drv/timer.h>
+#include <drv/irq_cm3.h>
+
+#include <cpu/irq.h>
+#include <cpu/power.h>
+
+#include <io/cm3.h>
+
+struct DmacCh
+{
+	reg32_t *src;
+	reg32_t *dst;
+	reg32_t *desc;
+	reg32_t *cfg;
+	reg32_t *ctrla;
+	reg32_t *ctrlb;
+};
+
+#define DMAC_CHANNEL_CNT   5
+struct DmacCh dmac_ch[] =
+{
+	{
+		.src = &DMAC_SADDR0,
+		.dst = &DMAC_DADDR0,
+		.desc = &DMAC_DSCR0,
+		.cfg = &DMAC_CFG0,
+		.ctrla = &DMAC_CTRLA0,
+		.ctrlb = &DMAC_CTRLB0,
+	},
+	{
+		.src = &DMAC_SADDR1,
+		.dst = &DMAC_DADDR1,
+		.desc = &DMAC_DSCR1,
+		.cfg = &DMAC_CFG1,
+		.ctrla = &DMAC_CTRLA1,
+		.ctrlb = &DMAC_CTRLB1,
+	},
+	{
+		.src = &DMAC_SADDR2,
+		.dst = &DMAC_DADDR2,
+		.desc = &DMAC_DSCR2,
+		.cfg = &DMAC_CFG2,
+		.ctrla = &DMAC_CTRLA2,
+		.ctrlb = &DMAC_CTRLB2,
+	},
+	{
+		.src = &DMAC_SADDR3,
+		.dst = &DMAC_DADDR3,
+		.desc = &DMAC_DSCR3,
+		.cfg = &DMAC_CFG3,
+		.ctrla = &DMAC_CTRLA3,
+		.ctrlb = &DMAC_CTRLB3,
+	},
+	{
+		.src = &DMAC_SADDR4,
+		.dst = &DMAC_DADDR4,
+		.desc = &DMAC_DSCR4,
+		.cfg = &DMAC_CFG4,
+		.ctrla = &DMAC_CTRLA4,
+		.ctrlb = &DMAC_CTRLB4,
+	},
+	{
+		.src = &DMAC_SADDR5,
+		.dst = &DMAC_DADDR5,
+		.desc = &DMAC_DSCR5,
+		.cfg = &DMAC_CFG5,
+		.ctrla = &DMAC_CTRLA5,
+		.ctrlb = &DMAC_CTRLB5,
+	},
+};
+
+void dmac_setSources(Dmac *dmac, uint8_t ch, uint32_t src, uint32_t dst, size_t transfer_size)
+{
+	ASSERT(ch <= DMAC_CHANNEL_CNT);
+
+	DMAC_CHDR = BV(ch);
+
+	*dmac_ch[ch].src = src;
+	*dmac_ch[ch].dst = dst;
+	*dmac_ch[ch].desc = 0;
+	dmac->transfer_size = transfer_size;
+}
+
+void dmac_configureDmac(Dmac *dmac, uint8_t ch, uint32_t cfg, uint32_t ctrla, uint32_t ctrlb)
+{
+	ASSERT(ch <= DMAC_CHANNEL_CNT);
+
+	DMAC_CHDR = BV(ch);
+
+	*dmac_ch[ch].cfg = cfg | DMAC_CFG_FIFOCFG_ALAP_CFG | (0x1 << DMAC_CFG_AHB_PROT_SHIFT);
+	*dmac_ch[ch].ctrla = ctrla | (dmac->transfer_size & DMAC_CTRLA_BTSIZE_MASK);
+	*dmac_ch[ch].ctrlb = ctrlb | BV(DMAC_CTRLB_IEN);
+}
+
+int dmac_start(Dmac *dmac, uint8_t ch)
+{
+	ASSERT(ch <= DMAC_CHANNEL_CNT);
+
+	if (DMAC_CHSR & BV(ch))
+	{
+		dmac->errors |= DMAC_ERR_CH_ALREDY_ON;
+		return -1;
+	}
+
+	DMAC_CHER = BV(ch);
+	return 0;
+}
+
+bool dmac_isDone(Dmac *dmac, uint8_t ch)
+{
+	(void)dmac;
+	return (DMAC_EBCISR |= BV(ch));
+}
+
+bool dmac_waitDone(Dmac *dmac, uint8_t ch)
+{
+	(void)dmac;
+	while(!(DMAC_EBCISR |= BV(ch)))
+		cpu_relax();
+
+	return true;
+}
+
+static DECLARE_ISR(dmac_irq)
+{
+}
+
+void dmac_init(Dmac *dmac)
+{
+	(void)dmac;
+
+	//init DMAC
+	DMAC_EBCIDR = 0x3FFFFF;
+	DMAC_CHDR = 0x1F;
+
+	pmc_periphEnable(DMAC_ID);
+	DMAC_EN = BV(DMAC_EN_ENABLE);
+	sysirq_setHandler(INT_DMAC, dmac_irq);
+}
diff --git a/bertos/cpu/cortex-m3/drv/dmac_sam3.h b/bertos/cpu/cortex-m3/drv/dmac_sam3.h
new file mode 100644
index 00000000..41aeb80b
--- /dev/null
+++ b/bertos/cpu/cortex-m3/drv/dmac_sam3.h
@@ -0,0 +1,73 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2011 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief DMAC utility interface.
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#ifndef DRV_DMAC_SAM3_H
+#define DRV_DMAC_SAM3_H
+
+#include <cfg/macros.h>
+
+#include <cpu/types.h>
+
+/**
+ * DMA Transfer Descriptor as well as Linked List Item
+ */
+typedef struct DmacDesc
+{
+    uint32_t src_addr;     ///< Source buffer address
+    uint32_t dst_addr;     ///< Destination buffer address
+    uint32_t ctrl_a;       ///< Control A register settings
+    uint32_t ctrl_b;       ///< Control B register settings
+    uint32_t dsc_addr;     ///< Next descriptor address
+} DmacDesc;
+
+typedef struct Dmac
+{
+	uint8_t errors;
+	size_t transfer_size;
+} Dmac;
+
+#define DMAC_ERR_CH_ALREDY_ON    BV(0)
+
+void dmac_setSources(Dmac *dmac, uint8_t ch, uint32_t src, uint32_t dst, size_t transfer_size);
+void dmac_configureDmac(Dmac *dmac, uint8_t ch, uint32_t cfg, uint32_t ctrla, uint32_t ctrlb);
+int dmac_start(Dmac *dmac, uint8_t ch);
+bool dmac_isDone(Dmac *dmac, uint8_t ch);
+bool dmac_waitDone(Dmac *dmac, uint8_t ch);
+
+void dmac_init(Dmac *dmac);
+
+#endif /* DRV_DMAC_SAM3_H */
-- 
2.25.1