hw/sparc32_dma.c - qemu - Git at Google

 /*
  * 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 "hw.h"
 #include "sparc32_dma.h"
 #include "sun4m.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)
 #else
 #define DPRINTF(fmt, args...)
 #endif

 #define DMA_REGS 4
 #define DMA_SIZE (4 * sizeof(uint32_t))
 #define DMA_MAXADDR (DMA_SIZE - 1)

 #define DMA_VER 0xa0000000
 #define DMA_INTR 1
 #define DMA_INTREN 0x10
 #define DMA_WRITE_MEM 0x100
 #define DMA_LOADED 0x04000000
 #define DMA_DRAIN_FIFO 0x40
 #define DMA_RESET 0x80

 typedef struct DMAState DMAState;

 struct DMAState {
     uint32_t dmaregs[DMA_REGS];
     qemu_irq irq;
     void *iommu;
     qemu_irq dev_reset;
 };

 /* Note: on sparc, the lance 16 bit bus is swapped */
 void ledma_memory_read(void *opaque, target_phys_addr_t addr,
                        uint8_t *buf, int len, int do_bswap)
 {
     DMAState *s = opaque;
     int i;

     DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
             s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
     addr |= s->dmaregs[3];
     if (do_bswap) {
         sparc_iommu_memory_read(s->iommu, addr, buf, len);
     } else {
         addr &= ~1;
         len &= ~1;
         sparc_iommu_memory_read(s->iommu, addr, buf, len);
         for(i = 0; i < len; i += 2) {
             bswap16s((uint16_t *)(buf + i));
         }
     }
 }

 void ledma_memory_write(void *opaque, target_phys_addr_t addr,
                         uint8_t *buf, int len, int do_bswap)
 {
     DMAState *s = opaque;
     int l, i;
     uint16_t tmp_buf[32];

     DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
             s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
     addr |= s->dmaregs[3];
     if (do_bswap) {
         sparc_iommu_memory_write(s->iommu, addr, buf, len);
     } else {
         addr &= ~1;
         len &= ~1;
         while (len > 0) {
             l = len;
             if (l > sizeof(tmp_buf))
                 l = sizeof(tmp_buf);
             for(i = 0; i < l; i += 2) {
                 tmp_buf[i >> 1] = bswap16(*(uint16_t *)(buf + i));
             }
             sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l);
             len -= l;
             buf += l;
             addr += l;
         }
     }
 }

 static void dma_set_irq(void *opaque, int irq, int level)
 {
     DMAState *s = opaque;
     if (level) {
         DPRINTF("Raise IRQ\n");
         s->dmaregs[0] |= DMA_INTR;
         qemu_irq_raise(s->irq);
     } else {
         s->dmaregs[0] &= ~DMA_INTR;
         DPRINTF("Lower IRQ\n");
         qemu_irq_lower(s->irq);
     }
 }

 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 " TARGET_FMT_plx ": 0x%8.8x\n", addr,
             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 " TARGET_FMT_plx ": 0x%8.8x -> 0x%8.8x\n", addr,
             s->dmaregs[saddr], val);
     switch (saddr) {
     case 0:
         if (!(val & DMA_INTREN)) {
             DPRINTF("Lower IRQ\n");
             qemu_irq_lower(s->irq);
         }
         if (val & DMA_RESET) {
             qemu_irq_raise(s->dev_reset);
             qemu_irq_lower(s->dev_reset);
         } else if (val & DMA_DRAIN_FIFO) {
             val &= ~DMA_DRAIN_FIFO;
         } else if (val == 0)
             val = DMA_DRAIN_FIFO;
         val &= 0x0fffffff;
         val |= DMA_VER;
         break;
     case 1:
         s->dmaregs[0] |= DMA_LOADED;
         break;
     default:
         break;
     }
     s->dmaregs[saddr] = val;
 }

 static CPUReadMemoryFunc *dma_mem_read[3] = {
     NULL,
     NULL,
     dma_mem_readl,
 };

 static CPUWriteMemoryFunc *dma_mem_write[3] = {
     NULL,
     NULL,
     dma_mem_writel,
 };

 static void dma_reset(void *opaque)
 {
     DMAState *s = opaque;

     memset(s->dmaregs, 0, DMA_SIZE);
     s->dmaregs[0] = 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 != 2)
         return -EINVAL;
     for (i = 0; i < DMA_REGS; i++)
         qemu_get_be32s(f, &s->dmaregs[i]);

     return 0;
 }

 void *sparc32_dma_init(target_phys_addr_t daddr, qemu_irq parent_irq,
                        void *iommu, qemu_irq **dev_irq, qemu_irq **reset)
 {
     DMAState *s;
     int dma_io_memory;

     s = qemu_mallocz(sizeof(DMAState));
     if (!s)
         return NULL;

     s->irq = parent_irq;
     s->iommu = iommu;

     dma_io_memory = cpu_register_io_memory(0, dma_mem_read, dma_mem_write, s);
     cpu_register_physical_memory(daddr, DMA_SIZE, dma_io_memory);

     register_savevm("sparc32_dma", daddr, 2, dma_save, dma_load, s);
     qemu_register_reset(dma_reset, s);
     *dev_irq = qemu_allocate_irqs(dma_set_irq, s, 1);

     *reset = &s->dev_reset;

     return s;
 }
	/*
	* 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 "hw.h"
	#include "sparc32_dma.h"
	#include "sun4m.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)
	#else
	#define DPRINTF(fmt, args...)
	#endif

	#define DMA_REGS 4
	#define DMA_SIZE (4 * sizeof(uint32_t))
	#define DMA_MAXADDR (DMA_SIZE - 1)

	#define DMA_VER 0xa0000000
	#define DMA_INTR 1
	#define DMA_INTREN 0x10
	#define DMA_WRITE_MEM 0x100
	#define DMA_LOADED 0x04000000
	#define DMA_DRAIN_FIFO 0x40
	#define DMA_RESET 0x80

	typedef struct DMAState DMAState;

	struct DMAState {
	uint32_t dmaregs[DMA_REGS];
	qemu_irq irq;
	void *iommu;
	qemu_irq dev_reset;
	};

	/* Note: on sparc, the lance 16 bit bus is swapped */
	void ledma_memory_read(void *opaque, target_phys_addr_t addr,
	uint8_t *buf, int len, int do_bswap)
	{
	DMAState *s = opaque;
	int i;

	DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
	s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
	addr \|= s->dmaregs[3];
	if (do_bswap) {
	sparc_iommu_memory_read(s->iommu, addr, buf, len);
	} else {
	addr &= ~1;
	len &= ~1;
	sparc_iommu_memory_read(s->iommu, addr, buf, len);
	for(i = 0; i < len; i += 2) {
	bswap16s((uint16_t *)(buf + i));
	}
	}
	}

	void ledma_memory_write(void *opaque, target_phys_addr_t addr,
	uint8_t *buf, int len, int do_bswap)
	{
	DMAState *s = opaque;
	int l, i;
	uint16_t tmp_buf[32];

	DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
	s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
	addr \|= s->dmaregs[3];
	if (do_bswap) {
	sparc_iommu_memory_write(s->iommu, addr, buf, len);
	} else {
	addr &= ~1;
	len &= ~1;
	while (len > 0) {
	l = len;
	if (l > sizeof(tmp_buf))
	l = sizeof(tmp_buf);
	for(i = 0; i < l; i += 2) {
	tmp_buf[i >> 1] = bswap16((uint16_t )(buf + i));
	}
	sparc_iommu_memory_write(s->iommu, addr, (uint8_t *)tmp_buf, l);
	len -= l;
	buf += l;
	addr += l;
	}
	}
	}

	static void dma_set_irq(void *opaque, int irq, int level)
	{
	DMAState *s = opaque;
	if (level) {
	DPRINTF("Raise IRQ\n");
	s->dmaregs[0] \|= DMA_INTR;
	qemu_irq_raise(s->irq);
	} else {
	s->dmaregs[0] &= ~DMA_INTR;
	DPRINTF("Lower IRQ\n");
	qemu_irq_lower(s->irq);
	}
	}

	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 " TARGET_FMT_plx ": 0x%8.8x\n", addr,
	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 " TARGET_FMT_plx ": 0x%8.8x -> 0x%8.8x\n", addr,
	s->dmaregs[saddr], val);
	switch (saddr) {
	case 0:
	if (!(val & DMA_INTREN)) {
	DPRINTF("Lower IRQ\n");
	qemu_irq_lower(s->irq);
	}
	if (val & DMA_RESET) {
	qemu_irq_raise(s->dev_reset);
	qemu_irq_lower(s->dev_reset);
	} else if (val & DMA_DRAIN_FIFO) {
	val &= ~DMA_DRAIN_FIFO;
	} else if (val == 0)
	val = DMA_DRAIN_FIFO;
	val &= 0x0fffffff;
	val \|= DMA_VER;
	break;
	case 1:
	s->dmaregs[0] \|= DMA_LOADED;
	break;
	default:
	break;
	}
	s->dmaregs[saddr] = val;
	}

	static CPUReadMemoryFunc *dma_mem_read[3] = {
	NULL,
	NULL,
	dma_mem_readl,
	};

	static CPUWriteMemoryFunc *dma_mem_write[3] = {
	NULL,
	NULL,
	dma_mem_writel,
	};

	static void dma_reset(void *opaque)
	{
	DMAState *s = opaque;

	memset(s->dmaregs, 0, DMA_SIZE);
	s->dmaregs[0] = 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 != 2)
	return -EINVAL;
	for (i = 0; i < DMA_REGS; i++)
	qemu_get_be32s(f, &s->dmaregs[i]);

	return 0;
	}

	void *sparc32_dma_init(target_phys_addr_t daddr, qemu_irq parent_irq,
	void iommu, qemu_irq dev_irq, qemu_irq *reset)
	{
	DMAState *s;
	int dma_io_memory;

	s = qemu_mallocz(sizeof(DMAState));
	if (!s)
	return NULL;

	s->irq = parent_irq;
	s->iommu = iommu;

	dma_io_memory = cpu_register_io_memory(0, dma_mem_read, dma_mem_write, s);
	cpu_register_physical_memory(daddr, DMA_SIZE, dma_io_memory);

	register_savevm("sparc32_dma", daddr, 2, dma_save, dma_load, s);
	qemu_register_reset(dma_reset, s);
	*dev_irq = qemu_allocate_irqs(dma_set_irq, s, 1);

	*reset = &s->dev_reset;

	return s;
	}