root / hw / sparc32_dma.c @ 7165448a
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/*
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* QEMU Sparc32 DMA controller emulation
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*
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* Copyright (c) 2006 Fabrice Bellard
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*
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* Modifications:
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* 2010-Feb-14 Artyom Tarasenko : reworked irq generation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw.h" |
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#include "sparc32_dma.h" |
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#include "sun4m.h" |
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#include "sysbus.h" |
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#include "trace.h" |
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/*
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* This is the DMA controller part of chip STP2000 (Master I/O), also
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* produced as NCR89C100. See
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* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C100.txt
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* and
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* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt
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*/
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#define DMA_REGS 4 |
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#define DMA_SIZE (4 * sizeof(uint32_t)) |
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/* We need the mask, because one instance of the device is not page
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aligned (ledma, start address 0x0010) */
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#define DMA_MASK (DMA_SIZE - 1) |
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/* OBP says 0x20 bytes for ledma, the extras are aliased to espdma */
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#define DMA_ETH_SIZE (8 * sizeof(uint32_t)) |
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#define DMA_MAX_REG_OFFSET (2 * DMA_SIZE - 1) |
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#define DMA_VER 0xa0000000 |
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#define DMA_INTR 1 |
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#define DMA_INTREN 0x10 |
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#define DMA_WRITE_MEM 0x100 |
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#define DMA_EN 0x200 |
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#define DMA_LOADED 0x04000000 |
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#define DMA_DRAIN_FIFO 0x40 |
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#define DMA_RESET 0x80 |
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/* XXX SCSI and ethernet should have different read-only bit masks */
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#define DMA_CSR_RO_MASK 0xfe000007 |
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typedef struct DMAState DMAState; |
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struct DMAState {
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SysBusDevice busdev; |
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uint32_t dmaregs[DMA_REGS]; |
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qemu_irq irq; |
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void *iommu;
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qemu_irq gpio[2];
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uint32_t is_ledma; |
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}; |
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enum {
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GPIO_RESET = 0,
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GPIO_DMA, |
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}; |
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/* Note: on sparc, the lance 16 bit bus is swapped */
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void ledma_memory_read(void *opaque, target_phys_addr_t addr, |
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uint8_t *buf, int len, int do_bswap) |
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{ |
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DMAState *s = opaque; |
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int i;
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addr |= s->dmaregs[3];
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trace_ledma_memory_read(addr); |
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if (do_bswap) {
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sparc_iommu_memory_read(s->iommu, addr, buf, len); |
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} else {
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addr &= ~1;
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len &= ~1;
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sparc_iommu_memory_read(s->iommu, addr, buf, len); |
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for(i = 0; i < len; i += 2) { |
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bswap16s((uint16_t *)(buf + i)); |
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} |
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} |
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} |
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void ledma_memory_write(void *opaque, target_phys_addr_t addr, |
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uint8_t *buf, int len, int do_bswap) |
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{ |
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DMAState *s = opaque; |
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int l, i;
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uint16_t tmp_buf[32];
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addr |= s->dmaregs[3];
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trace_ledma_memory_write(addr); |
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if (do_bswap) {
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sparc_iommu_memory_write(s->iommu, addr, buf, len); |
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} else {
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addr &= ~1;
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len &= ~1;
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while (len > 0) { |
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l = len; |
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if (l > sizeof(tmp_buf)) |
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l = sizeof(tmp_buf);
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for(i = 0; i < l; i += 2) { |
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tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i));
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} |
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sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l); |
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len -= l; |
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buf += l; |
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addr += l; |
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} |
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} |
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} |
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static void dma_set_irq(void *opaque, int irq, int level) |
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{ |
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DMAState *s = opaque; |
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if (level) {
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s->dmaregs[0] |= DMA_INTR;
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if (s->dmaregs[0] & DMA_INTREN) { |
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trace_sparc32_dma_set_irq_raise(); |
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qemu_irq_raise(s->irq); |
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} |
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} else {
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if (s->dmaregs[0] & DMA_INTR) { |
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s->dmaregs[0] &= ~DMA_INTR;
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if (s->dmaregs[0] & DMA_INTREN) { |
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trace_sparc32_dma_set_irq_lower(); |
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qemu_irq_lower(s->irq); |
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} |
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} |
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} |
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} |
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void espdma_memory_read(void *opaque, uint8_t *buf, int len) |
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{ |
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DMAState *s = opaque; |
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trace_espdma_memory_read(s->dmaregs[1]);
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sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len);
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s->dmaregs[1] += len;
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} |
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void espdma_memory_write(void *opaque, uint8_t *buf, int len) |
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{ |
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DMAState *s = opaque; |
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trace_espdma_memory_write(s->dmaregs[1]);
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sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len);
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s->dmaregs[1] += len;
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} |
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static uint32_t dma_mem_readl(void *opaque, target_phys_addr_t addr) |
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{ |
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DMAState *s = opaque; |
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uint32_t saddr; |
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if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) {
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/* aliased to espdma, but we can't get there from here */
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/* buggy driver if using undocumented behavior, just return 0 */
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trace_sparc32_dma_mem_readl(addr, 0);
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return 0; |
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} |
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saddr = (addr & DMA_MASK) >> 2;
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trace_sparc32_dma_mem_readl(addr, s->dmaregs[saddr]); |
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return s->dmaregs[saddr];
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} |
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static void dma_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val) |
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{ |
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DMAState *s = opaque; |
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uint32_t saddr; |
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if (s->is_ledma && (addr > DMA_MAX_REG_OFFSET)) {
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/* aliased to espdma, but we can't get there from here */
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trace_sparc32_dma_mem_writel(addr, 0, val);
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return;
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} |
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saddr = (addr & DMA_MASK) >> 2;
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trace_sparc32_dma_mem_writel(addr, s->dmaregs[saddr], val); |
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switch (saddr) {
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case 0: |
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if (val & DMA_INTREN) {
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if (s->dmaregs[0] & DMA_INTR) { |
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trace_sparc32_dma_set_irq_raise(); |
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qemu_irq_raise(s->irq); |
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} |
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} else {
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if (s->dmaregs[0] & (DMA_INTR | DMA_INTREN)) { |
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trace_sparc32_dma_set_irq_lower(); |
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qemu_irq_lower(s->irq); |
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} |
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} |
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if (val & DMA_RESET) {
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qemu_irq_raise(s->gpio[GPIO_RESET]); |
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qemu_irq_lower(s->gpio[GPIO_RESET]); |
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} else if (val & DMA_DRAIN_FIFO) { |
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val &= ~DMA_DRAIN_FIFO; |
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} else if (val == 0) |
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val = DMA_DRAIN_FIFO; |
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if (val & DMA_EN && !(s->dmaregs[0] & DMA_EN)) { |
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trace_sparc32_dma_enable_raise(); |
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qemu_irq_raise(s->gpio[GPIO_DMA]); |
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} else if (!(val & DMA_EN) && !!(s->dmaregs[0] & DMA_EN)) { |
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trace_sparc32_dma_enable_lower(); |
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qemu_irq_lower(s->gpio[GPIO_DMA]); |
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} |
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val &= ~DMA_CSR_RO_MASK; |
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val |= DMA_VER; |
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s->dmaregs[0] = (s->dmaregs[0] & DMA_CSR_RO_MASK) | val; |
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break;
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case 1: |
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s->dmaregs[0] |= DMA_LOADED;
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/* fall through */
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default:
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s->dmaregs[saddr] = val; |
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break;
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} |
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} |
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static CPUReadMemoryFunc * const dma_mem_read[3] = { |
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NULL,
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NULL,
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dma_mem_readl, |
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}; |
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static CPUWriteMemoryFunc * const dma_mem_write[3] = { |
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NULL,
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NULL,
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dma_mem_writel, |
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}; |
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static void dma_reset(DeviceState *d) |
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{ |
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DMAState *s = container_of(d, DMAState, busdev.qdev); |
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memset(s->dmaregs, 0, DMA_SIZE);
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s->dmaregs[0] = DMA_VER;
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} |
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static const VMStateDescription vmstate_dma = { |
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.name ="sparc32_dma",
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.version_id = 2,
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.minimum_version_id = 2,
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.minimum_version_id_old = 2,
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.fields = (VMStateField []) { |
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VMSTATE_UINT32_ARRAY(dmaregs, DMAState, DMA_REGS), |
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VMSTATE_END_OF_LIST() |
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} |
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}; |
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static int sparc32_dma_init1(SysBusDevice *dev) |
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{ |
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DMAState *s = FROM_SYSBUS(DMAState, dev); |
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int dma_io_memory;
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int reg_size;
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sysbus_init_irq(dev, &s->irq); |
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dma_io_memory = cpu_register_io_memory(dma_mem_read, dma_mem_write, s, |
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DEVICE_NATIVE_ENDIAN); |
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reg_size = s->is_ledma ? DMA_ETH_SIZE : DMA_SIZE; |
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sysbus_init_mmio(dev, reg_size, dma_io_memory); |
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qdev_init_gpio_in(&dev->qdev, dma_set_irq, 1);
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qdev_init_gpio_out(&dev->qdev, s->gpio, 2);
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return 0; |
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} |
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static SysBusDeviceInfo sparc32_dma_info = {
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.init = sparc32_dma_init1, |
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.qdev.name = "sparc32_dma",
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.qdev.size = sizeof(DMAState),
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.qdev.vmsd = &vmstate_dma, |
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.qdev.reset = dma_reset, |
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.qdev.props = (Property[]) { |
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DEFINE_PROP_PTR("iommu_opaque", DMAState, iommu),
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DEFINE_PROP_UINT32("is_ledma", DMAState, is_ledma, 0), |
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DEFINE_PROP_END_OF_LIST(), |
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} |
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}; |
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static void sparc32_dma_register_devices(void) |
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{ |
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sysbus_register_withprop(&sparc32_dma_info); |
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} |
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device_init(sparc32_dma_register_devices) |