patch-2.4.19 linux-2.4.19/include/asm-mips/au1000_dma.h

• Lines: 388
• Date: Fri Aug 2 17:39:45 2002
• Orig file: linux-2.4.18/include/asm-mips/au1000_dma.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/include/asm-mips/au1000_dma.h linux-2.4.19/include/asm-mips/au1000_dma.h
@@ -0,0 +1,387 @@
+/*
+ * BRIEF MODULE DESCRIPTION
+ *	Defines for using and allocating dma channels on the Alchemy
+ *      Au1000 mips processor.
+ *
+ * Copyright 2000 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ *         	stevel@mvista.com or source@mvista.com
+ *
+ *  This program 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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+#ifndef __ASM_AU1000_DMA_H
+#define __ASM_AU1000_DMA_H
+
+#include <asm/io.h>		/* need byte IO */
+#include <linux/spinlock.h>	/* And spinlocks */
+#include <linux/delay.h>
+#include <asm/system.h>
+
+#define NUM_AU1000_DMA_CHANNELS	8
+
+/* DMA Channel Base Addresses */
+#define DMA_CHANNEL_BASE	0xB4002000
+#define DMA_CHANNEL_LEN		0x00000100
+
+/* DMA Channel Register Offsets */
+#define DMA_MODE_SET		0x00000000
+#define DMA_MODE_CLEAR		0x00000004
+/* DMA Mode register bits follow */
+#define DMA_DAH_MASK		(0x0f << 20)
+#define DMA_DID_BIT		16
+#define DMA_DID_MASK		(0x0f << DMA_DID_BIT)
+#define DMA_BE			(1<<13)
+#define DMA_DR			(1<<12)
+#define DMA_TS8			(1<<11)
+#define DMA_DW_BIT		9
+#define DMA_DW_MASK		(0x03 << DMA_DW_BIT)
+#define DMA_DW8			(0 << DMA_DW_BIT)
+#define DMA_DW16		(1 << DMA_DW_BIT)
+#define DMA_DW32		(2 << DMA_DW_BIT)
+#define DMA_NC			(1<<8)
+#define DMA_IE			(1<<7)
+#define DMA_HALT		(1<<6)
+#define DMA_GO			(1<<5)
+#define DMA_AB			(1<<4)
+#define DMA_D1			(1<<3)
+#define DMA_BE1			(1<<2)
+#define DMA_D0			(1<<1)
+#define DMA_BE0			(1<<0)
+
+#define DMA_PERIPHERAL_ADDR       0x00000008
+#define DMA_BUFFER0_START         0x0000000C
+#define DMA_BUFFER1_START         0x00000014
+#define DMA_BUFFER0_COUNT         0x00000010
+#define DMA_BUFFER1_COUNT         0x00000018
+#define DMA_BAH_BIT 16
+#define DMA_BAH_MASK (0x0f << DMA_BAH_BIT)
+#define DMA_COUNT_BIT 0
+#define DMA_COUNT_MASK (0xffff << DMA_COUNT_BIT)
+
+/* DMA Device ID's follow */
+enum {
+	DMA_ID_UART0_TX = 0,
+	DMA_ID_UART0_RX,
+	DMA_ID_GP04,
+	DMA_ID_GP05,
+	DMA_ID_AC97C_TX,
+	DMA_ID_AC97C_RX,
+	DMA_ID_UART3_TX,
+	DMA_ID_UART3_RX,
+	DMA_ID_USBDEV_EP0_RX,
+	DMA_ID_USBDEV_EP0_TX,
+	DMA_ID_USBDEV_EP2_TX,
+	DMA_ID_USBDEV_EP3_TX,
+	DMA_ID_USBDEV_EP4_RX,
+	DMA_ID_USBDEV_EP5_RX,
+	DMA_ID_I2S_TX,
+	DMA_ID_I2S_RX,
+	DMA_NUM_DEV
+};
+
+struct dma_chan {
+	int dev_id;		// this channel is allocated if >=0, free otherwise
+	unsigned int io;
+	int irq;
+	const char *dev_str;
+	unsigned int fifo_addr;
+	unsigned int mode;
+};
+
+/* These are in arch/mips/au1000/common/dma.c */
+extern struct dma_chan au1000_dma_table[];
+extern int request_au1000_dma(int dev_id, const char *dev_str);
+extern void free_au1000_dma(unsigned int dmanr);
+extern int au1000_dma_read_proc(char *buf, char **start, off_t fpos,
+				int length, int *eof, void *data);
+extern void dump_au1000_dma_channel(unsigned int dmanr);
+extern spinlock_t au1000_dma_spin_lock;
+
+
+static __inline__ struct dma_chan *get_dma_chan(unsigned int dmanr)
+{
+	if (dmanr > NUM_AU1000_DMA_CHANNELS
+	    || au1000_dma_table[dmanr].dev_id < 0)
+		return NULL;
+	return &au1000_dma_table[dmanr];
+}
+
+static __inline__ unsigned long claim_dma_lock(void)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&au1000_dma_spin_lock, flags);
+	return flags;
+}
+
+static __inline__ void release_dma_lock(unsigned long flags)
+{
+	spin_unlock_irqrestore(&au1000_dma_spin_lock, flags);
+}
+
+/*
+ * Set the DMA buffer enable bits in the mode register.
+ */
+static __inline__ void enable_dma_buffer0(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	au_writel(DMA_BE0, chan->io + DMA_MODE_SET);
+}
+static __inline__ void enable_dma_buffer1(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	au_writel(DMA_BE1, chan->io + DMA_MODE_SET);
+}
+static __inline__ void enable_dma_buffers(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	au_writel(DMA_BE0 | DMA_BE1, chan->io + DMA_MODE_SET);
+}
+
+/* enable/disable a specific DMA channel */
+static __inline__ void enable_dma(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+
+	// set device FIFO address
+	au_writel(virt_to_phys((void *) chan->fifo_addr),
+		  chan->io + DMA_PERIPHERAL_ADDR);
+
+	au_writel(chan->
+		  mode | (chan->dev_id << DMA_DID_BIT) | DMA_IE | DMA_GO,
+		  chan->io + DMA_MODE_SET);
+}
+
+#define DMA_HALT_POLL 0x5000
+
+static __inline__ void disable_dma(unsigned int dmanr)
+{
+	int i;
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+
+	au_writel(DMA_D1 | DMA_D0 | DMA_GO, chan->io + DMA_MODE_CLEAR);
+
+	// poll the halt bit
+	for (i = 0; i < DMA_HALT_POLL; i++)
+		if (au_readl(chan->io + DMA_MODE_SET) & DMA_HALT)
+			break;
+	if (i == DMA_HALT_POLL) {
+		printk(KERN_INFO "disable_dma: HALT poll expired!\n");
+	} else {
+		// now we can disable the buffers
+		au_writel(~DMA_GO, chan->io + DMA_MODE_CLEAR);
+	}
+}
+
+
+/*
+ * set mode for a specific DMA channel
+ */
+static __inline__ void set_dma_mode(unsigned int dmanr, unsigned int mode)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	/*
+	 * chan->mode only holds endianess, direction, transfer size, device
+	 * FIFO width, and cacheability info for the channel. Make sure
+	 * anything else is masked off.
+	 */
+	mode &= (DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
+	chan->mode = mode;
+}
+
+static __inline__ int get_dma_active_buffer(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return -1;
+	return (au_readl(chan->io + DMA_MODE_SET) & DMA_AB) ? 1 : 0;
+}
+
+
+/*
+ * set the device FIFO address for a specific DMA channel - only
+ * applicable to GPO4 and GPO5. All the other devices have fixed
+ * FIFO addresses.
+ */
+static __inline__ void set_dma_fifo_addr(unsigned int dmanr,
+					 unsigned int a)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+
+	if (chan->dev_id != DMA_ID_GP04 && chan->dev_id != DMA_ID_GP05)
+		return;
+
+	au_writel(virt_to_phys((void *) a),
+		  chan->io + DMA_PERIPHERAL_ADDR);
+}
+
+/*
+ * Clear the DMA buffer done bits in the mode register.
+ */
+static __inline__ void clear_dma_done0(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	au_writel(DMA_D0, chan->io + DMA_MODE_CLEAR);
+}
+static __inline__ void clear_dma_done1(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	au_writel(DMA_D1, chan->io + DMA_MODE_CLEAR);
+}
+
+/*
+ * This does nothing - not applicable to Au1000 DMA.
+ */
+static __inline__ void set_dma_page(unsigned int dmanr, char pagenr)
+{
+}
+
+/*
+ * Set Buffer 0 transfer address for specific DMA channel.
+ */
+static __inline__ void set_dma_addr0(unsigned int dmanr, unsigned int a)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	au_writel(a, chan->io + DMA_BUFFER0_START);
+}
+
+/*
+ * Set Buffer 1 transfer address for specific DMA channel.
+ */
+static __inline__ void set_dma_addr1(unsigned int dmanr, unsigned int a)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	au_writel(a, chan->io + DMA_BUFFER1_START);
+}
+
+
+/*
+ * Set Buffer 0 transfer size (max 64k) for a specific DMA channel.
+ */
+static __inline__ void set_dma_count0(unsigned int dmanr,
+				      unsigned int count)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	count &= DMA_COUNT_MASK;
+	au_writel(count, chan->io + DMA_BUFFER0_COUNT);
+}
+
+/*
+ * Set Buffer 1 transfer size (max 64k) for a specific DMA channel.
+ */
+static __inline__ void set_dma_count1(unsigned int dmanr,
+				      unsigned int count)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	count &= DMA_COUNT_MASK;
+	au_writel(count, chan->io + DMA_BUFFER1_COUNT);
+}
+
+/*
+ * Set both buffer transfer sizes (max 64k) for a specific DMA channel.
+ */
+static __inline__ void set_dma_count(unsigned int dmanr,
+				     unsigned int count)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return;
+	count &= DMA_COUNT_MASK;
+	au_writel(count, chan->io + DMA_BUFFER0_COUNT);
+	au_writel(count, chan->io + DMA_BUFFER1_COUNT);
+}
+
+/*
+ * Returns which buffer has its done bit set in the mode register.
+ * Returns -1 if neither or both done bits set.
+ */
+static __inline__ unsigned int get_dma_buffer_done(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return 0;
+
+    return au_readl(chan->io + DMA_MODE_SET) & (DMA_D0 | DMA_D1);
+}
+
+
+/*
+ * Returns the DMA channel's Buffer Done IRQ number.
+ */
+static __inline__ int get_dma_done_irq(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return -1;
+
+	return chan->irq;
+}
+
+/*
+ * Get DMA residue count. Returns the number of _bytes_ left to transfer.
+ */
+static __inline__ int get_dma_residue(unsigned int dmanr)
+{
+	int curBufCntReg, count;
+	struct dma_chan *chan = get_dma_chan(dmanr);
+	if (!chan)
+		return 0;
+
+	curBufCntReg = (au_readl(chan->io + DMA_MODE_SET) & DMA_AB) ?
+	    DMA_BUFFER1_COUNT : DMA_BUFFER0_COUNT;
+
+	count = au_readl(chan->io + curBufCntReg) & DMA_COUNT_MASK;
+
+	if ((chan->mode & DMA_DW_MASK) == DMA_DW16)
+		count <<= 1;
+	else if ((chan->mode & DMA_DW_MASK) == DMA_DW32)
+		count <<= 2;
+
+	return count;
+}
+
+#endif /* __ASM_AU1000_DMA_H */