mga_dma.c

linux-2.6.15.6

/* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
 * Created: Mon Dec 13 01:50:01 1999 by [e-mail]
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * 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 (including the next
 * paragraph) 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
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS 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.
 */

/**
 * \file mga_dma.c
 * DMA support for MGA G200 / G400.
 *
 * \author Rickard E. (Rik) Faith <[e-mail]>
 * \author Jeff Hartmann <[e-mail]>
 * \author Keith Whitwell <[e-mail]>
 * \author Gareth Hughes <[e-mail]>
 */

#include "drmP.h"
#include "drm.h"
#include "drm_sarea.h"
#include "mga_drm.h"
#include "mga_drv.h"

#define MGA_DEFAULT_USEC_TIMEOUT	10000
#define MGA_FREELIST_DEBUG		0

static int mga_do_cleanup_dma(drm_device_t * dev);

/* ================================================================
 * Engine control
 */

int mga_do_wait_for_idle(drm_mga_private_t * dev_priv)
{
	u32 status = 0;
	int i;
	DRM_DEBUG("\n");

	for (i = 0; i < dev_priv->usec_timeout; i++) {
		status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
		if (status == MGA_ENDPRDMASTS) {
			MGA_WRITE8(MGA_CRTC_INDEX, 0);
			return 0;
		}
		DRM_UDELAY(1);
	}

#if MGA_DMA_DEBUG
	DRM_ERROR("failed!\n");
	DRM_INFO("   status=0x%08x\n", status);
#endif
	return DRM_ERR(EBUSY);
}

static int mga_do_dma_reset(drm_mga_private_t * dev_priv)
{
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_primary_buffer_t *primary = &dev_priv->prim;

	DRM_DEBUG("\n");

	/* The primary DMA stream should look like new right about now.
	 */
	primary->tail = 0;
	primary->space = primary->size;
	primary->last_flush = 0;

	sarea_priv->last_wrap = 0;

	/* FIXME: Reset counters, buffer ages etc...
	 */

	/* FIXME: What else do we need to reinitialize?  WARP stuff?
	 */

	return 0;
}

/* ================================================================
 * Primary DMA stream
 */

void mga_do_dma_flush(drm_mga_private_t * dev_priv)
{
	drm_mga_primary_buffer_t *primary = &dev_priv->prim;
	u32 head, tail;
	u32 status = 0;
	int i;
	DMA_LOCALS;
	DRM_DEBUG("\n");

	/* We need to wait so that we can do an safe flush */
	for (i = 0; i < dev_priv->usec_timeout; i++) {
		status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
		if (status == MGA_ENDPRDMASTS)
			break;
		DRM_UDELAY(1);
	}

	if (primary->tail == primary->last_flush) {
		DRM_DEBUG("   bailing out...\n");
		return;
	}

	tail = primary->tail + dev_priv->primary->offset;

	/* We need to pad the stream between flushes, as the card
	 * actually (partially?) reads the first of these commands.
	 * See page 4-16 in the G400 manual, middle of the page or so.
	 */
	BEGIN_DMA(1);

	DMA_BLOCK(MGA_DMAPAD, 0x00000000,
		  MGA_DMAPAD, 0x00000000,
		  MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);

	ADVANCE_DMA();

	primary->last_flush = primary->tail;

	head = MGA_READ(MGA_PRIMADDRESS);

	if (head <= tail) {
		primary->space = primary->size - primary->tail;
	} else {
		primary->space = head - tail;
	}

	DRM_DEBUG("   head = 0x%06lx\n", head - dev_priv->primary->offset);
	DRM_DEBUG("   tail = 0x%06lx\n", tail - dev_priv->primary->offset);
	DRM_DEBUG("  space = 0x%06x\n", primary->space);

	mga_flush_write_combine();
	MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);

	DRM_DEBUG("done.\n");
}

void mga_do_dma_wrap_start(drm_mga_private_t * dev_priv)
{
	drm_mga_primary_buffer_t *primary = &dev_priv->prim;
	u32 head, tail;
	DMA_LOCALS;
	DRM_DEBUG("\n");

	BEGIN_DMA_WRAP();

	DMA_BLOCK(MGA_DMAPAD, 0x00000000,
		  MGA_DMAPAD, 0x00000000,
		  MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);

	ADVANCE_DMA();

	tail = primary->tail + dev_priv->primary->offset;

	primary->tail = 0;
	primary->last_flush = 0;
	primary->last_wrap++;

	head = MGA_READ(MGA_PRIMADDRESS);

	if (head == dev_priv->primary->offset) {
		primary->space = primary->size;
	} else {
		primary->space = head - dev_priv->primary->offset;
	}

	DRM_DEBUG("   head = 0x%06lx\n", head - dev_priv->primary->offset);
	DRM_DEBUG("   tail = 0x%06x\n", primary->tail);
	DRM_DEBUG("   wrap = %d\n", primary->last_wrap);
	DRM_DEBUG("  space = 0x%06x\n", primary->space);

	mga_flush_write_combine();
	MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);

	set_bit(0, &primary->wrapped);
	DRM_DEBUG("done.\n");
}

void mga_do_dma_wrap_end(drm_mga_private_t * dev_priv)
{
	drm_mga_primary_buffer_t *primary = &dev_priv->prim;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	u32 head = dev_priv->primary->offset;
	DRM_DEBUG("\n");

	sarea_priv->last_wrap++;
	DRM_DEBUG("   wrap = %d\n", sarea_priv->last_wrap);

	mga_flush_write_combine();
	MGA_WRITE(MGA_PRIMADDRESS, head | MGA_DMA_GENERAL);

	clear_bit(0, &primary->wrapped);
	DRM_DEBUG("done.\n");
}

/* ================================================================
 * Freelist management
 */

#define MGA_BUFFER_USED		~0
#define MGA_BUFFER_FREE		0

#if MGA_FREELIST_DEBUG
static void mga_freelist_print(drm_device_t * dev)
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_freelist_t *entry;

	DRM_INFO("\n");
	DRM_INFO("current dispatch: last=0x%x done=0x%x\n",
		 dev_priv->sarea_priv->last_dispatch,
		 (unsigned int)(MGA_READ(MGA_PRIMADDRESS) -
				dev_priv->primary->offset));
	DRM_INFO("current freelist:\n");

	for (entry = dev_priv->head->next; entry; entry = entry->next) {
		DRM_INFO("   %p   idx=%2d  age=0x%x 0x%06lx\n",
			 entry, entry->buf->idx, entry->age.head,
			 entry->age.head - dev_priv->primary->offset);
	}
	DRM_INFO("\n");
}
#endif

static int mga_freelist_init(drm_device_t * dev, drm_mga_private_t * dev_priv)
{
	drm_device_dma_t *dma = dev->dma;
	drm_buf_t *buf;
	drm_mga_buf_priv_t *buf_priv;
	drm_mga_freelist_t *entry;
	int i;
	DRM_DEBUG("count=%d\n", dma->buf_count);

	dev_priv->head = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
	if (dev_priv->head == NULL)
		return DRM_ERR(ENOMEM);

	memset(dev_priv->head, 0, sizeof(drm_mga_freelist_t));
	SET_AGE(&dev_priv->head->age, MGA_BUFFER_USED, 0);

	for (i = 0; i < dma->buf_count; i++) {
		buf = dma->buflist[i];
		buf_priv = buf->dev_private;

		entry = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
		if (entry == NULL)
			return DRM_ERR(ENOMEM);

		memset(entry, 0, sizeof(drm_mga_freelist_t));

		entry->next = dev_priv->head->next;
		entry->prev = dev_priv->head;
		SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
		entry->buf = buf;

		if (dev_priv->head->next != NULL)
			dev_priv->head->next->prev = entry;
		if (entry->next == NULL)
			dev_priv->tail = entry;

		buf_priv->list_entry = entry;
		buf_priv->discard = 0;
		buf_priv->dispatched = 0;

		dev_priv->head->next = entry;
	}

	return 0;
}

static void mga_freelist_cleanup(drm_device_t * dev)
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_freelist_t *entry;
	drm_mga_freelist_t *next;
	DRM_DEBUG("\n");

	entry = dev_priv->head;
	while (entry) {
		next = entry->next;
		drm_free(entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
		entry = next;
	}

	dev_priv->head = dev_priv->tail = NULL;
}

#if 0
/* FIXME: Still needed?
 */
static void mga_freelist_reset(drm_device_t * dev)
{
	drm_device_dma_t *dma = dev->dma;
	drm_buf_t *buf;
	drm_mga_buf_priv_t *buf_priv;
	int i;

	for (i = 0; i < dma->buf_count; i++) {
		buf = dma->buflist[i];
		buf_priv = buf->dev_private;
		SET_AGE(&buf_priv->list_entry->age, MGA_BUFFER_FREE, 0);
	}
}
#endif

static drm_buf_t *mga_freelist_get(drm_device_t * dev)
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_freelist_t *next;
	drm_mga_freelist_t *prev;
	drm_mga_freelist_t *tail = dev_priv->tail;
	u32 head, wrap;
	DRM_DEBUG("\n");

	head = MGA_READ(MGA_PRIMADDRESS);
	wrap = dev_priv->sarea_priv->last_wrap;

	DRM_DEBUG("   tail=0x%06lx %d\n",
		  tail->age.head ?
		  tail->age.head - dev_priv->primary->offset : 0,
		  tail->age.wrap);
	DRM_DEBUG("   head=0x%06lx %d\n",
		  head - dev_priv->primary->offset, wrap);

	if (TEST_AGE(&tail->age, head, wrap)) {
		prev = dev_priv->tail->prev;
		next = dev_priv->tail;
		prev->next = NULL;
		next->prev = next->next = NULL;
		dev_priv->tail = prev;
		SET_AGE(&next->age, MGA_BUFFER_USED, 0);
		return next->buf;
	}

	DRM_DEBUG("returning NULL!\n");
	return NULL;
}

int mga_freelist_put(drm_device_t * dev, drm_buf_t * buf)
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_buf_priv_t *buf_priv = buf->dev_private;
	drm_mga_freelist_t *head, *entry, *prev;

	DRM_DEBUG("age=0x%06lx wrap=%d\n",
		  buf_priv->list_entry->age.head -
		  dev_priv->primary->offset, buf_priv->list_entry->age.wrap);

	entry = buf_priv->list_entry;
	head = dev_priv->head;

	if (buf_priv->list_entry->age.head == MGA_BUFFER_USED) {
		SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
		prev = dev_priv->tail;
		prev->next = entry;
		entry->prev = prev;
		entry->next = NULL;
	} else {
		prev = head->next;
		head->next = entry;
		prev->prev = entry;
		entry->prev = head;
		entry->next = prev;
	}

	return 0;
}

/* ================================================================
 * DMA initialization, cleanup
 */

int mga_driver_preinit(drm_device_t * dev, unsigned long flags)
{
	drm_mga_private_t *dev_priv;

	dev_priv = drm_alloc(sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
	if (!dev_priv)
		return DRM_ERR(ENOMEM);

	dev->dev_private = (void *)dev_priv;
	memset(dev_priv, 0, sizeof(drm_mga_private_t));

	dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
	dev_priv->chipset = flags;

	return 0;
}

#if __OS_HAS_AGP
/**
 * Bootstrap the driver for AGP DMA.
 *
 * \todo
 * Investigate whether there is any benifit to storing the WARP microcode in
 * AGP memory.  If not, the microcode may as well always be put in PCI
 * memory.
 *
 * \todo
 * This routine needs to set dma_bs->agp_mode to the mode actually configured
 * in the hardware.  Looking just at the Linux AGP driver code, I don't see
 * an easy way to determine this.
 *
 * \sa mga_do_dma_bootstrap, mga_do_pci_dma_bootstrap
 */
static int mga_do_agp_dma_bootstrap(drm_device_t * dev,
				    drm_mga_dma_bootstrap_t * dma_bs)
{
	drm_mga_private_t *const dev_priv =
	    (drm_mga_private_t *) dev->dev_private;
	unsigned int warp_size = mga_warp_microcode_size(dev_priv);
	int err;
	unsigned offset;
	const unsigned secondary_size = dma_bs->secondary_bin_count
	    * dma_bs->secondary_bin_size;
	const unsigned agp_size = (dma_bs->agp_size << 20);
	drm_buf_desc_t req;
	drm_agp_mode_t mode;
	drm_agp_info_t info;

	/* Acquire AGP. */
	err = drm_agp_acquire(dev);
	if (err) {
		DRM_ERROR("Unable to acquire AGP\n");
		return err;
	}

	err = drm_agp_info(dev, &info);
	if (err) {
		DRM_ERROR("Unable to get AGP info\n");
		return err;
	}

	mode.mode = (info.mode & ~0x07) | dma_bs->agp_mode;
	err = drm_agp_enable(dev, mode);
	if (err) {
		DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
		return err;
	}

	/* In addition to the usual AGP mode configuration, the G200 AGP cards
	 * need to have the AGP mode "manually" set.
	 */

	if (dev_priv->chipset == MGA_CARD_TYPE_G200) {
		if (mode.mode & 0x02) {
			MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_ENABLE);
		} else {
			MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_DISABLE);
		}
	}

	/* Allocate and bind AGP memory. */
	dev_priv->agp_pages = agp_size / PAGE_SIZE;
	dev_priv->agp_mem = drm_alloc_agp(dev, dev_priv->agp_pages, 0);
	if (dev_priv->agp_mem == NULL) {
		dev_priv->agp_pages = 0;
		DRM_ERROR("Unable to allocate %uMB AGP memory\n",
			  dma_bs->agp_size);
		return DRM_ERR(ENOMEM);
	}

	err = drm_bind_agp(dev_priv->agp_mem, 0);
	if (err) {
		DRM_ERROR("Unable to bind AGP memory\n");
		return err;
	}

	/* Make drm_addbufs happy by not trying to create a mapping for less
	 * than a page.
	 */
	if (warp_size < PAGE_SIZE)
		warp_size = PAGE_SIZE;

	offset = 0;
	err = drm_addmap(dev, offset, warp_size,
			 _DRM_AGP, _DRM_READ_ONLY, &dev_priv->warp);
	if (err) {
		DRM_ERROR("Unable to map WARP microcode\n");
		return err;
	}

	offset += warp_size;
	err = drm_addmap(dev, offset, dma_bs->primary_size,
			 _DRM_AGP, _DRM_READ_ONLY, &dev_priv->primary);
	if (err) {
		DRM_ERROR("Unable to map primary DMA region\n");
		return err;
	}

	offset += dma_bs->primary_size;
	err = drm_addmap(dev, offset, secondary_size,
			 _DRM_AGP, 0, &dev->agp_buffer_map);
	if (err) {
		DRM_ERROR("Unable to map secondary DMA region\n");
		return err;
	}

	(void)memset(&req, 0, sizeof(req));
	req.count = dma_bs->secondary_bin_count;
	req.size = dma_bs->secondary_bin_size;
	req.flags = _DRM_AGP_BUFFER;
	req.agp_start = offset;

	err = drm_addbufs_agp(dev, &req);
	if (err) {
		DRM_ERROR("Unable to add secondary DMA buffers\n");
		return err;
	}

	offset += secondary_size;
	err = drm_addmap(dev, offset, agp_size - offset,
			 _DRM_AGP, 0, &dev_priv->agp_textures);
	if (err) {
		DRM_ERROR("Unable to map AGP texture region\n");
		return err;
	}

	drm_core_ioremap(dev_priv->warp, dev);
	drm_core_ioremap(dev_priv->primary, dev);
	drm_core_ioremap(dev->agp_buffer_map, dev);

	if (!dev_priv->warp->handle ||
	    !dev_priv->primary->handle || !dev->agp_buffer_map->handle) {
		DRM_ERROR("failed to ioremap agp regions! (%p, %p, %p)\n",
			  dev_priv->warp->handle, dev_priv->primary->handle,
			  dev->agp_buffer_map->handle);
		return DRM_ERR(ENOMEM);
	}

	dev_priv->dma_access = MGA_PAGPXFER;
	dev_priv->wagp_enable = MGA_WAGP_ENABLE;

	DRM_INFO("Initialized card for AGP DMA.\n");
	return 0;
}
#else
static int mga_do_agp_dma_bootstrap(drm_device_t * dev,
				    drm_mga_dma_bootstrap_t * dma_bs)
{
	return -EINVAL;
}
#endif

/**
 * Bootstrap the driver for PCI DMA.
 *
 * \todo
 * The algorithm for decreasing the size of the primary DMA buffer could be
 * better.  The size should be rounded up to the nearest page size, then