path: root/arch/mips/au1000/common/dbdma.c

/*
 *
 * BRIEF MODULE DESCRIPTION
 *      The Descriptor Based DMA channel manager that first appeared
 *	on the Au1550.  I started with dma.c, but I think all that is
 *	left is this initial comment :-)
 *
 * Copyright 2004 Embedded Edge, LLC
 *	dan@embeddededge.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.
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_dbdma.h>
#include <asm/system.h>


#if defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200)

/*
 * The Descriptor Based DMA supports up to 16 channels.
 *
 * There are 32 devices defined. We keep an internal structure
 * of devices using these channels, along with additional
 * information.
 *
 * We allocate the descriptors and allow access to them through various
 * functions.  The drivers allocate the data buffers and assign them
 * to the descriptors.
 */
static DEFINE_SPINLOCK(au1xxx_dbdma_spin_lock);

/* I couldn't find a macro that did this......
*/
#define ALIGN_ADDR(x, a)	((((u32)(x)) + (a-1)) & ~(a-1))

static dbdma_global_t *dbdma_gptr = (dbdma_global_t *)DDMA_GLOBAL_BASE;
static int dbdma_initialized=0;
static void au1xxx_dbdma_init(void);

static dbdev_tab_t dbdev_tab[] = {
#ifdef CONFIG_SOC_AU1550
	/* UARTS */
	{ DSCR_CMD0_UART0_TX, DEV_FLAGS_OUT, 0, 8, 0x11100004, 0, 0 },
	{ DSCR_CMD0_UART0_RX, DEV_FLAGS_IN, 0, 8, 0x11100000, 0, 0 },
	{ DSCR_CMD0_UART3_TX, DEV_FLAGS_OUT, 0, 8, 0x11400004, 0, 0 },
	{ DSCR_CMD0_UART3_RX, DEV_FLAGS_IN, 0, 8, 0x11400000, 0, 0 },

	/* EXT DMA */
	{ DSCR_CMD0_DMA_REQ0, 0, 0, 0, 0x00000000, 0, 0 },
	{ DSCR_CMD0_DMA_REQ1, 0, 0, 0, 0x00000000, 0, 0 },
	{ DSCR_CMD0_DMA_REQ2, 0, 0, 0, 0x00000000, 0, 0 },
	{ DSCR_CMD0_DMA_REQ3, 0, 0, 0, 0x00000000, 0, 0 },

	/* USB DEV */
	{ DSCR_CMD0_USBDEV_RX0, DEV_FLAGS_IN, 4, 8, 0x10200000, 0, 0 },
	{ DSCR_CMD0_USBDEV_TX0, DEV_FLAGS_OUT, 4, 8, 0x10200004, 0, 0 },
	{ DSCR_CMD0_USBDEV_TX1, DEV_FLAGS_OUT, 4, 8, 0x10200008, 0, 0 },
	{ DSCR_CMD0_USBDEV_TX2, DEV_FLAGS_OUT, 4, 8, 0x1020000c, 0, 0 },
	{ DSCR_CMD0_USBDEV_RX3, DEV_FLAGS_IN, 4, 8, 0x10200010, 0, 0 },
	{ DSCR_CMD0_USBDEV_RX4, DEV_FLAGS_IN, 4, 8, 0x10200014, 0, 0 },

	/* PSC 0 */
	{ DSCR_CMD0_PSC0_TX, DEV_FLAGS_OUT, 0, 0, 0x11a0001c, 0, 0 },
	{ DSCR_CMD0_PSC0_RX, DEV_FLAGS_IN, 0, 0, 0x11a0001c, 0, 0 },

	/* PSC 1 */
	{ DSCR_CMD0_PSC1_TX, DEV_FLAGS_OUT, 0, 0, 0x11b0001c, 0, 0 },
	{ DSCR_CMD0_PSC1_RX, DEV_FLAGS_IN, 0, 0, 0x11b0001c, 0, 0 },

	/* PSC 2 */
	{ DSCR_CMD0_PSC2_TX, DEV_FLAGS_OUT, 0, 0, 0x10a0001c, 0, 0 },
	{ DSCR_CMD0_PSC2_RX, DEV_FLAGS_IN, 0, 0, 0x10a0001c, 0, 0 },

	/* PSC 3 */
	{ DSCR_CMD0_PSC3_TX, DEV_FLAGS_OUT, 0, 0, 0x10b0001c, 0, 0 },
	{ DSCR_CMD0_PSC3_RX, DEV_FLAGS_IN, 0, 0, 0x10b0001c, 0, 0 },

	{ DSCR_CMD0_PCI_WRITE, 0, 0, 0, 0x00000000, 0, 0 },	/* PCI */
	{ DSCR_CMD0_NAND_FLASH, 0, 0, 0, 0x00000000, 0, 0 },	/* NAND */

	/* MAC 0 */
	{ DSCR_CMD0_MAC0_RX, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 },
	{ DSCR_CMD0_MAC0_TX, DEV_FLAGS_OUT, 0, 0, 0x00000000, 0, 0 },

	/* MAC 1 */
	{ DSCR_CMD0_MAC1_RX, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0