Handle on-chip DMA controllers in one place, convert OMAP DMA to use it.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4920 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 115 insertions, 0 deletions

diff --git a/hw/soc_dma.h b/hw/soc_dma.h
new file mode 100644
index 0000000..6ce8b9e
--- /dev/null
+++ b/hw/soc_dma.h
@@ -0,0 +1,115 @@
+/*
+ * On-chip DMA controller framework.
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Written by Andrzej Zaborowski <andrew@openedhand.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 or
+ * (at your option) version 3 of the License.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+struct soc_dma_s;
+struct soc_dma_ch_s;
+typedef void (*soc_dma_io_t)(void *opaque, uint8_t *buf, int len);
+typedef void (*soc_dma_transfer_t)(struct soc_dma_ch_s *ch);
+
+enum soc_dma_port_type {
+    soc_dma_port_mem,
+    soc_dma_port_fifo,
+    soc_dma_port_other,
+};
+
+enum soc_dma_access_type {
+    soc_dma_access_const,
+    soc_dma_access_linear,
+    soc_dma_access_other,
+};
+
+struct soc_dma_ch_s {
+    /* Private */
+    struct soc_dma_s *dma;
+    int num;
+    QEMUTimer *timer;
+
+    /* Set by soc_dma.c */
+    int enable;
+    int update;
+
+    /* This should be set by dma->setup_fn().  */
+    int bytes;
+    /* Initialised by the DMA module, call soc_dma_ch_update after writing.  */
+    enum soc_dma_access_type type[2];
+    target_phys_addr_t vaddr[2];	/* Updated by .transfer_fn().  */
+    /* Private */
+    void *paddr[2];
+    soc_dma_io_t io_fn[2];
+    void *io_opaque[2];
+
+    int running;
+    soc_dma_transfer_t transfer_fn;
+
+    /* Set and used by the DMA module.  */
+    void *opaque;
+};
+
+struct soc_dma_s {
+    /* Following fields are set by the SoC DMA module and can be used
+     * by anybody.  */
+    uint64_t drqbmp;	/* Is zeroed by soc_dma_reset() */
+    qemu_irq *drq;
+    void *opaque;
+    int64_t freq;
+    soc_dma_transfer_t transfer_fn;
+    soc_dma_transfer_t setup_fn;
+    /* Set by soc_dma_init() for use by the DMA module.  */
+    struct soc_dma_ch_s *ch;
+};
+
+/* Call to activate or stop a DMA channel.  */
+void soc_dma_set_request(struct soc_dma_ch_s *ch, int level);
+/* Call after every write to one of the following fields and before
+ * calling soc_dma_set_request(ch, 1):
+ *   ch->type[0...1],
+ *   ch->vaddr[0...1],
+ *   ch->paddr[0...1],
+ * or after a soc_dma_port_add_fifo() or soc_dma_port_add_mem().  */
+void soc_dma_ch_update(struct soc_dma_ch_s *ch);
+
+/* The SoC should call this when the DMA module is being reset.  */
+void soc_dma_reset(struct soc_dma_s *s);
+struct soc_dma_s *soc_dma_init(int n);
+
+void soc_dma_port_add_fifo(struct soc_dma_s *dma, target_phys_addr_t virt_base,
+                soc_dma_io_t fn, void *opaque, int out);
+void soc_dma_port_add_mem(struct soc_dma_s *dma, uint8_t *phys_base,
+                target_phys_addr_t virt_base, size_t size);
+
+static inline void soc_dma_port_add_fifo_in(struct soc_dma_s *dma,
+                target_phys_addr_t virt_base, soc_dma_io_t fn, void *opaque)
+{
+    return soc_dma_port_add_fifo(dma, virt_base, fn, opaque, 0);
+}
+
+static inline void soc_dma_port_add_fifo_out(struct soc_dma_s *dma,
+                target_phys_addr_t virt_base, soc_dma_io_t fn, void *opaque)
+{
+    return soc_dma_port_add_fifo(dma, virt_base, fn, opaque, 1);
+}
+
+static inline void soc_dma_port_add_mem_ram(struct soc_dma_s *dma,
+                ram_addr_t offset, target_phys_addr_t virt_base, size_t size)
+{
+    return soc_dma_port_add_mem(dma, phys_ram_base + offset, virt_base, size);
+}