Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 109 insertions, 0 deletions

diff --git a/arch/sh/drivers/dma/dma-pvr2.c b/arch/sh/drivers/dma/dma-pvr2.c
new file mode 100644
index 000000000000..2e1d58f2d1b9
--- /dev/null
+++ b/arch/sh/drivers/dma/dma-pvr2.c
@@ -0,0 +1,109 @@
+/*
+ * arch/sh/boards/dreamcast/dma-pvr2.c
+ *
+ * NEC PowerVR 2 (Dreamcast) DMA support
+ *
+ * Copyright (C) 2003, 2004  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <asm/mach/sysasic.h>
+#include <asm/mach/dma.h>
+#include <asm/dma.h>
+#include <asm/io.h>
+
+static unsigned int xfer_complete = 0;
+static int count = 0;
+
+static irqreturn_t pvr2_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        if (get_dma_residue(PVR2_CASCADE_CHAN)) {
+                printk(KERN_WARNING "DMA: SH DMAC did not complete transfer "
+                       "on channel %d, waiting..\n", PVR2_CASCADE_CHAN);
+                dma_wait_for_completion(PVR2_CASCADE_CHAN);
+        }
+
+        if (count++ < 10)
+                pr_debug("Got a pvr2 dma interrupt for channel %d\n",
+                         irq - HW_EVENT_PVR2_DMA);
+
+        xfer_complete = 1;
+
+        return IRQ_HANDLED;
+}
+
+static int pvr2_request_dma(struct dma_channel *chan)
+{
+        if (ctrl_inl(PVR2_DMA_MODE) != 0)
+                return -EBUSY;
+
+        ctrl_outl(0, PVR2_DMA_LMMODE0);
+
+        return 0;
+}
+
+static int pvr2_get_dma_residue(struct dma_channel *chan)
+{
+        return xfer_complete == 0;
+}
+
+static int pvr2_xfer_dma(struct dma_channel *chan)
+{
+        if (chan->sar || !chan->dar)
+                return -EINVAL;
+
+        xfer_complete = 0;
+
+        ctrl_outl(chan->dar, PVR2_DMA_ADDR);
+        ctrl_outl(chan->count, PVR2_DMA_COUNT);
+        ctrl_outl(chan->mode & DMA_MODE_MASK, PVR2_DMA_MODE);
+
+        return 0;
+}
+
+static struct irqaction pvr2_dma_irq = {
+        .name           = "pvr2 DMA handler",
+        .handler        = pvr2_dma_interrupt,
+        .flags          = SA_INTERRUPT,
+};
+
+static struct dma_ops pvr2_dma_ops = {
+        .request        = pvr2_request_dma,
+        .get_residue    = pvr2_get_dma_residue,
+        .xfer           = pvr2_xfer_dma,
+};
+
+static struct dma_info pvr2_dma_info = {
+        .name           = "PowerVR 2 DMA",
+        .nr_channels    = 1,
+        .ops            = &pvr2_dma_ops,
+        .flags          = DMAC_CHANNELS_TEI_CAPABLE,
+};
+
+static int __init pvr2_dma_init(void)
+{
+        setup_irq(HW_EVENT_PVR2_DMA, &pvr2_dma_irq);
+        request_dma(PVR2_CASCADE_CHAN, "pvr2 cascade");
+
+        return register_dmac(&pvr2_dma_info);
+}
+
+static void __exit pvr2_dma_exit(void)
+{
+        free_dma(PVR2_CASCADE_CHAN);
+        free_irq(HW_EVENT_PVR2_DMA, 0);
+}
+
+subsys_initcall(pvr2_dma_init);
+module_exit(pvr2_dma_exit);
+
+MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
+MODULE_DESCRIPTION("NEC PowerVR 2 DMA driver");
+MODULE_LICENSE("GPL");
+