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-rw-r--r--hw/sparc32_dma.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/hw/sparc32_dma.c b/hw/sparc32_dma.c
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index 0000000000..d8d7e6a83e
--- /dev/null
+++ b/hw/sparc32_dma.c
@@ -0,0 +1,249 @@
+/*
+ * QEMU Sparc32 DMA controller emulation
+ *
+ * Copyright (c) 2006 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "vl.h"
+
+/* debug DMA */
+//#define DEBUG_DMA
+
+/*
+ * This is the DMA controller part of chip STP2000 (Master I/O), also
+ * produced as NCR89C100. See
+ * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
+ * and
+ * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt
+ */
+
+#ifdef DEBUG_DMA
+#define DPRINTF(fmt, args...) \
+do { printf("DMA: " fmt , ##args); } while (0)
+#define pic_set_irq_new(ctl, irq, level) \
+ do { printf("DMA: set_irq(%d): %d\n", (irq), (level)); \
+ pic_set_irq_new((ctl), (irq),(level));} while (0)
+#else
+#define DPRINTF(fmt, args...)
+#endif
+
+#define DMA_REGS 8
+#define DMA_MAXADDR (DMA_REGS * 4 - 1)
+
+#define DMA_VER 0xa0000000
+#define DMA_INTR 1
+#define DMA_INTREN 0x10
+#define DMA_WRITE_MEM 0x100
+#define DMA_LOADED 0x04000000
+#define DMA_RESET 0x80
+
+typedef struct DMAState DMAState;
+
+struct DMAState {
+ uint32_t dmaregs[DMA_REGS];
+ int espirq, leirq;
+ void *iommu, *esp_opaque, *lance_opaque, *intctl;
+};
+
+void ledma_set_irq(void *opaque, int isr)
+{
+ DMAState *s = opaque;
+
+ pic_set_irq_new(s->intctl, s->leirq, isr);
+}
+
+void ledma_memory_read(void *opaque, target_phys_addr_t addr, uint8_t *buf, int len)
+{
+ DMAState *s = opaque;
+
+ DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
+ s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
+ sparc_iommu_memory_read(s->iommu, addr | s->dmaregs[7], buf, len);
+}
+
+void ledma_memory_write(void *opaque, target_phys_addr_t addr, uint8_t *buf, int len)
+{
+ DMAState *s = opaque;
+
+ DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
+ s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
+ sparc_iommu_memory_write(s->iommu, addr | s->dmaregs[7], buf, len);
+}
+
+void espdma_raise_irq(void *opaque)
+{
+ DMAState *s = opaque;
+
+ s->dmaregs[0] |= DMA_INTR;
+ pic_set_irq_new(s->intctl, s->espirq, 1);
+}
+
+void espdma_clear_irq(void *opaque)
+{
+ DMAState *s = opaque;
+
+ s->dmaregs[0] &= ~DMA_INTR;
+ pic_set_irq_new(s->intctl, s->espirq, 0);
+}
+
+void espdma_memory_read(void *opaque, uint8_t *buf, int len)
+{
+ DMAState *s = opaque;
+
+ DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
+ s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
+ sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len);
+ s->dmaregs[0] |= DMA_INTR;
+ s->dmaregs[1] += len;
+}
+
+void espdma_memory_write(void *opaque, uint8_t *buf, int len)
+{
+ DMAState *s = opaque;
+
+ DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
+ s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
+ sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len);
+ s->dmaregs[0] |= DMA_INTR;
+ s->dmaregs[1] += len;
+}
+
+static uint32_t dma_mem_readl(void *opaque, target_phys_addr_t addr)
+{
+ DMAState *s = opaque;
+ uint32_t saddr;
+
+ saddr = (addr & DMA_MAXADDR) >> 2;
+ DPRINTF("read dmareg[%d]: 0x%8.8x\n", saddr, s->dmaregs[saddr]);
+
+ return s->dmaregs[saddr];
+}
+
+static void dma_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+ DMAState *s = opaque;
+ uint32_t saddr;
+
+ saddr = (addr & DMA_MAXADDR) >> 2;
+ DPRINTF("write dmareg[%d]: 0x%8.8x -> 0x%8.8x\n", saddr, s->dmaregs[saddr], val);
+ switch (saddr) {
+ case 0:
+ if (!(val & DMA_INTREN))
+ pic_set_irq_new(s->intctl, s->espirq, 0);
+ if (val & DMA_RESET) {
+ esp_reset(s->esp_opaque);
+ } else if (val & 0x40) {
+ val &= ~0x40;
+ } else if (val == 0)
+ val = 0x40;
+ val &= 0x0fffffff;
+ val |= DMA_VER;
+ break;
+ case 1:
+ s->dmaregs[0] |= DMA_LOADED;
+ break;
+ case 4:
+ if (!(val & DMA_INTREN))
+ pic_set_irq_new(s->intctl, s->leirq, 0);
+ if (val & DMA_RESET)
+ pcnet_h_reset(s->lance_opaque);
+ val &= 0x0fffffff;
+ val |= DMA_VER;
+ break;
+ default:
+ break;
+ }
+ s->dmaregs[saddr] = val;
+}
+
+static CPUReadMemoryFunc *dma_mem_read[3] = {
+ dma_mem_readl,
+ dma_mem_readl,
+ dma_mem_readl,
+};
+
+static CPUWriteMemoryFunc *dma_mem_write[3] = {
+ dma_mem_writel,
+ dma_mem_writel,
+ dma_mem_writel,
+};
+
+static void dma_reset(void *opaque)
+{
+ DMAState *s = opaque;
+
+ memset(s->dmaregs, 0, DMA_REGS * 4);
+ s->dmaregs[0] = DMA_VER;
+ s->dmaregs[4] = DMA_VER;
+}
+
+static void dma_save(QEMUFile *f, void *opaque)
+{
+ DMAState *s = opaque;
+ unsigned int i;
+
+ for (i = 0; i < DMA_REGS; i++)
+ qemu_put_be32s(f, &s->dmaregs[i]);
+}
+
+static int dma_load(QEMUFile *f, void *opaque, int version_id)
+{
+ DMAState *s = opaque;
+ unsigned int i;
+
+ if (version_id != 1)
+ return -EINVAL;
+ for (i = 0; i < DMA_REGS; i++)
+ qemu_get_be32s(f, &s->dmaregs[i]);
+
+ return 0;
+}
+
+void *sparc32_dma_init(uint32_t daddr, int espirq, int leirq, void *iommu, void *intctl)
+{
+ DMAState *s;
+ int dma_io_memory;
+
+ s = qemu_mallocz(sizeof(DMAState));
+ if (!s)
+ return NULL;
+
+ s->espirq = espirq;
+ s->leirq = leirq;
+ s->iommu = iommu;
+ s->intctl = intctl;
+
+ dma_io_memory = cpu_register_io_memory(0, dma_mem_read, dma_mem_write, s);
+ cpu_register_physical_memory(daddr, 16 * 2, dma_io_memory);
+
+ register_savevm("sparc32_dma", daddr, 1, dma_save, dma_load, s);
+ qemu_register_reset(dma_reset, s);
+
+ return s;
+}
+
+void sparc32_dma_set_reset_data(void *opaque, void *esp_opaque,
+ void *lance_opaque)
+{
+ DMAState *s = opaque;
+
+ s->esp_opaque = esp_opaque;
+ s->lance_opaque = lance_opaque;
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-12 00:14:58 +0000