Initial import

1 files changed, 265 insertions, 0 deletions

diff --git a/arch/mips/alchemy/common/dma.c b/arch/mips/alchemy/common/dma.c
new file mode 100644
index 000000000..4fb6207b8
--- /dev/null
+++ b/arch/mips/alchemy/common/dma.c
@@ -0,0 +1,265 @@
+/*
+ *
+ * BRIEF MODULE DESCRIPTION
+ *      A DMA channel allocator for Au1x00. API is modeled loosely off of
+ *      linux/kernel/dma.c.
+ *
+ * Copyright 2000, 2008 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc. <source@mvista.com>
+ * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
+ *
+ *  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/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1000_dma.h>
+
+/*
+ * A note on resource allocation:
+ *
+ * All drivers needing DMA channels, should allocate and release them
+ * through the public routines `request_dma()' and `free_dma()'.
+ *
+ * In order to avoid problems, all processes should allocate resources in
+ * the same sequence and release them in the reverse order.
+ *
+ * So, when allocating DMAs and IRQs, first allocate the DMA, then the IRQ.
+ * When releasing them, first release the IRQ, then release the DMA. The
+ * main reason for this order is that, if you are requesting the DMA buffer
+ * done interrupt, you won't know the irq number until the DMA channel is
+ * returned from request_dma.
+ */
+
+/* DMA Channel register block spacing */
+#define DMA_CHANNEL_LEN		0x00000100
+
+DEFINE_SPINLOCK(au1000_dma_spin_lock);
+
+struct dma_chan au1000_dma_table[NUM_AU1000_DMA_CHANNELS] = {
+      {.dev_id = -1,},
+      {.dev_id = -1,},
+      {.dev_id = -1,},
+      {.dev_id = -1,},
+      {.dev_id = -1,},
+      {.dev_id = -1,},
+      {.dev_id = -1,},
+      {.dev_id = -1,}
+};
+EXPORT_SYMBOL(au1000_dma_table);
+
+/* Device FIFO addresses and default DMA modes */
+static const struct dma_dev {
+	unsigned int fifo_addr;
+	unsigned int dma_mode;
+} dma_dev_table[DMA_NUM_DEV] = {
+	{ AU1000_UART0_PHYS_ADDR + 0x04, DMA_DW8 },		/* UART0_TX */
+	{ AU1000_UART0_PHYS_ADDR + 0x00, DMA_DW8 | DMA_DR },	/* UART0_RX */
+	{ 0, 0 },	/* DMA_REQ0 */
+	{ 0, 0 },	/* DMA_REQ1 */
+	{ AU1000_AC97_PHYS_ADDR + 0x08, DMA_DW16 },		/* AC97 TX c */
+	{ AU1000_AC97_PHYS_ADDR + 0x08, DMA_DW16 | DMA_DR },	/* AC97 RX c */
+	{ AU1000_UART3_PHYS_ADDR + 0x04, DMA_DW8 | DMA_NC },	/* UART3_TX */
+	{ AU1000_UART3_PHYS_ADDR + 0x00, DMA_DW8 | DMA_NC | DMA_DR }, /* UART3_RX */
+	{ AU1000_USB_UDC_PHYS_ADDR + 0x00, DMA_DW8 | DMA_NC | DMA_DR }, /* EP0RD */
+	{ AU1000_USB_UDC_PHYS_ADDR + 0x04, DMA_DW8 | DMA_NC }, /* EP0WR */
+	{ AU1000_USB_UDC_PHYS_ADDR + 0x08, DMA_DW8 | DMA_NC }, /* EP2WR */
+	{ AU1000_USB_UDC_PHYS_ADDR + 0x0c, DMA_DW8 | DMA_NC }, /* EP3WR */
+	{ AU1000_USB_UDC_PHYS_ADDR + 0x10, DMA_DW8 | DMA_NC | DMA_DR }, /* EP4RD */
+	{ AU1000_USB_UDC_PHYS_ADDR + 0x14, DMA_DW8 | DMA_NC | DMA_DR }, /* EP5RD */
+	/* on Au1500, these 2 are DMA_REQ2/3 (GPIO208/209) instead! */
+	{ AU1000_I2S_PHYS_ADDR + 0x00, DMA_DW32 | DMA_NC},	/* I2S TX */
+	{ AU1000_I2S_PHYS_ADDR + 0x00, DMA_DW32 | DMA_NC | DMA_DR}, /* I2S RX */
+};
+
+int au1000_dma_read_proc(char *buf, char **start, off_t fpos,
+			 int length, int *eof, void *data)
+{
+	int i, len = 0;
+	struct dma_chan *chan;
+
+	for (i = 0; i < NUM_AU1000_DMA_CHANNELS; i++) {
+		chan = get_dma_chan(i);
+		if (chan != NULL)
+			len += sprintf(buf + len, "%2d: %s\n",
+				       i, chan->dev_str);
+	}
+
+	if (fpos >= len) {
+		*start = buf;
+		*eof = 1;
+		return 0;
+	}
+	*start = buf + fpos;
+	len -= fpos;
+	if (len > length)
+		return length;
+	*eof = 1;
+	return len;
+}
+
+/* Device FIFO addresses and default DMA modes - 2nd bank */
+static const struct dma_dev dma_dev_table_bank2[DMA_NUM_DEV_BANK2] = {
+	{ AU1100_SD0_PHYS_ADDR + 0x00, DMA_DS | DMA_DW8 },		/* coherent */
+	{ AU1100_SD0_PHYS_ADDR + 0x04, DMA_DS | DMA_DW8 | DMA_DR },	/* coherent */
+	{ AU1100_SD1_PHYS_ADDR + 0x00, DMA_DS | DMA_DW8 },		/* coherent */
+	{ AU1100_SD1_PHYS_ADDR + 0x04, DMA_DS | DMA_DW8 | DMA_DR }	/* coherent */
+};
+
+void dump_au1000_dma_channel(unsigned int dmanr)
+{
+	struct dma_chan *chan;
+
+	if (dmanr >= NUM_AU1000_DMA_CHANNELS)
+		return;
+	chan = &au1000_dma_table[dmanr];
+
+	printk(KERN_INFO "Au1000 DMA%d Register Dump:\n", dmanr);
+	printk(KERN_INFO "  mode = 0x%08x\n",
+	       __raw_readl(chan->io + DMA_MODE_SET));
+	printk(KERN_INFO "  addr = 0x%08x\n",
+	       __raw_readl(chan->io + DMA_PERIPHERAL_ADDR));
+	printk(KERN_INFO "  start0 = 0x%08x\n",
+	       __raw_readl(chan->io + DMA_BUFFER0_START));
+	printk(KERN_INFO "  start1 = 0x%08x\n",
+	       __raw_readl(chan->io + DMA_BUFFER1_START));
+	printk(KERN_INFO "  count0 = 0x%08x\n",
+	       __raw_readl(chan->io + DMA_BUFFER0_COUNT));
+	printk(KERN_INFO "  count1 = 0x%08x\n",
+	       __raw_readl(chan->io + DMA_BUFFER1_COUNT));
+}
+
+/*
+ * Finds a free channel, and binds the requested device to it.
+ * Returns the allocated channel number, or negative on error.
+ * Requests the DMA done IRQ if irqhandler != NULL.
+ */
+int request_au1000_dma(int dev_id, const char *dev_str,
+		       irq_handler_t irqhandler,
+		       unsigned long irqflags,
+		       void *irq_dev_id)
+{
+	struct dma_chan *chan;
+	const struct dma_dev *dev;
+	int i, ret;
+
+	if (alchemy_get_cputype() == ALCHEMY_CPU_AU1100) {
+		if (dev_id < 0 || dev_id >= (DMA_NUM_DEV + DMA_NUM_DEV_BANK2))
+			return -EINVAL;
+	} else {
+		if (dev_id < 0 || dev_id >= DMA_NUM_DEV)
+			return -EINVAL;
+	}
+
+	for (i = 0; i < NUM_AU1000_DMA_CHANNELS; i++)
+		if (au1000_dma_table[i].dev_id < 0)
+			break;
+
+	if (i == NUM_AU1000_DMA_CHANNELS)
+		return -ENODEV;
+
+	chan = &au1000_dma_table[i];
+
+	if (dev_id >= DMA_NUM_DEV) {
+		dev_id -= DMA_NUM_DEV;
+		dev = &dma_dev_table_bank2[dev_id];
+	} else
+		dev = &dma_dev_table[dev_id];
+
+	if (irqhandler) {
+		chan->irq_dev = irq_dev_id;
+		ret = request_irq(chan->irq, irqhandler, irqflags, dev_str,
+				  chan->irq_dev);
+		if (ret) {
+			chan->irq_dev = NULL;
+			return ret;
+		}
+	} else {
+		chan->irq_dev = NULL;
+	}
+
+	/* fill it in */
+	chan->io = (void __iomem *)(KSEG1ADDR(AU1000_DMA_PHYS_ADDR) +
+			i * DMA_CHANNEL_LEN);
+	chan->dev_id = dev_id;
+	chan->dev_str = dev_str;
+	chan->fifo_addr = dev->fifo_addr;
+	chan->mode = dev->dma_mode;
+
+	/* initialize the channel before returning */
+	init_dma(i);
+
+	return i;
+}
+EXPORT_SYMBOL(request_au1000_dma);
+
+void free_au1000_dma(unsigned int dmanr)
+{
+	struct dma_chan *chan = get_dma_chan(dmanr);
+
+	if (!chan) {
+		printk(KERN_ERR "Error trying to free DMA%d\n", dmanr);
+		return;
+	}
+
+	disable_dma(dmanr);
+	if (chan->irq_dev)
+		free_irq(chan->irq, chan->irq_dev);
+
+	chan->irq_dev = NULL;
+	chan->dev_id = -1;
+}
+EXPORT_SYMBOL(free_au1000_dma);
+
+static int __init au1000_dma_init(void)
+{
+	int base, i;
+
+	switch (alchemy_get_cputype()) {
+	case ALCHEMY_CPU_AU1000:
+		base = AU1000_DMA_INT_BASE;
+		break;
+	case ALCHEMY_CPU_AU1500:
+		base = AU1500_DMA_INT_BASE;
+		break;
+	case ALCHEMY_CPU_AU1100:
+		base = AU1100_DMA_INT_BASE;
+		break;
+	default:
+		goto out;
+	}
+
+	for (i = 0; i < NUM_AU1000_DMA_CHANNELS; i++)
+		au1000_dma_table[i].irq = base + i;
+
+	printk(KERN_INFO "Alchemy DMA initialized\n");
+
+out:
+	return 0;
+}
+arch_initcall(au1000_dma_init);