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-rw-r--r--drivers/gpu/drm/mga/mga_dma.c1168
1 files changed, 1168 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mga/mga_dma.c b/drivers/gpu/drm/mga/mga_dma.c
new file mode 100644
index 000000000..331c2f0da
--- /dev/null
+++ b/drivers/gpu/drm/mga/mga_dma.c
@@ -0,0 +1,1168 @@
+/* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
+ * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.com
+ *
+ * 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 <faith@valinux.com>
+ * \author Jeff Hartmann <jhartmann@valinux.com>
+ * \author Keith Whitwell <keith@tungstengraphics.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+#include <linux/delay.h>
+
+#include "mga_drv.h"
+
+#define MGA_DEFAULT_USEC_TIMEOUT 10000
+#define MGA_FREELIST_DEBUG 0
+
+#define MINIMAL_CLEANUP 0
+#define FULL_CLEANUP 1
+static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup);
+
+/* ================================================================
+ * 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;
+ }
+ udelay(1);
+ }
+
+#if MGA_DMA_DEBUG
+ DRM_ERROR("failed!\n");
+ DRM_INFO(" status=0x%08x\n", status);
+#endif
+ return -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;
+ 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", (unsigned long)(head - dev_priv->primary->offset));
+ DRM_DEBUG(" tail = 0x%06lx\n", (unsigned long)(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", (unsigned long)(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(struct drm_device *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,
+ (unsigned long)(entry->age.head - dev_priv->primary->offset));
+ }
+ DRM_INFO("\n");
+}
+#endif
+
+static int mga_freelist_init(struct drm_device *dev, drm_mga_private_t *dev_priv)
+{
+ struct drm_device_dma *dma = dev->dma;
+ struct drm_buf *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 = kzalloc(sizeof(drm_mga_freelist_t), GFP_KERNEL);
+ if (dev_priv->head == NULL)
+ return -ENOMEM;
+
+ 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 = kzalloc(sizeof(drm_mga_freelist_t), GFP_KERNEL);
+ if (entry == NULL)
+ return -ENOMEM;
+
+ 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(struct drm_device *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;
+ kfree(entry);
+ entry = next;
+ }
+
+ dev_priv->head = dev_priv->tail = NULL;
+}
+
+#if 0
+/* FIXME: Still needed?
+ */
+static void mga_freelist_reset(struct drm_device *dev)
+{
+ struct drm_device_dma *dma = dev->dma;
+ struct drm_buf *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 struct drm_buf *mga_freelist_get(struct drm_device * 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 ?
+ (unsigned long)(tail->age.head - dev_priv->primary->offset) : 0,
+ tail->age.wrap);
+ DRM_DEBUG(" head=0x%06lx %d\n",
+ (unsigned long)(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(struct drm_device *dev, struct drm_buf *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",
+ (unsigned long)(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_load(struct drm_device *dev, unsigned long flags)
+{
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+ drm_mga_private_t *dev_priv;
+ int ret;
+
+ /* There are PCI versions of the G450. These cards have the
+ * same PCI ID as the AGP G450, but have an additional PCI-to-PCI
+ * bridge chip. We detect these cards, which are not currently
+ * supported by this driver, by looking at the device ID of the
+ * bus the "card" is on. If vendor is 0x3388 (Hint Corp) and the
+ * device is 0x0021 (HB6 Universal PCI-PCI bridge), we reject the
+ * device.
+ */
+ if ((pdev->device == 0x0525) && pdev->bus->self
+ && (pdev->bus->self->vendor == 0x3388)
+ && (pdev->bus->self->device == 0x0021)
+ && dev->agp) {
+ /* FIXME: This should be quirked in the pci core, but oh well
+ * the hw probably stopped existing. */
+ arch_phys_wc_del(dev->agp->agp_mtrr);
+ kfree(dev->agp);
+ dev->agp = NULL;
+ }
+ dev_priv = kzalloc(sizeof(drm_mga_private_t), GFP_KERNEL);
+ if (!dev_priv)
+ return -ENOMEM;
+
+ dev->dev_private = (void *)dev_priv;
+
+ dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
+ dev_priv->chipset = flags;
+
+ pci_set_master(pdev);
+
+ dev_priv->mmio_base = pci_resource_start(pdev, 1);
+ dev_priv->mmio_size = pci_resource_len(pdev, 1);
+
+ ret = drm_vblank_init(dev, 1);
+
+ if (ret) {
+ (void) mga_driver_unload(dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_AGP)
+/*
+ * Bootstrap the driver for AGP DMA.
+ *
+ * \todo
+ * Investigate whether there is any benefit 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(struct drm_device *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_UCODE_SIZE;
+ 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);
+ struct drm_buf_desc req;
+ struct drm_agp_mode mode;
+ struct drm_agp_info info;
+ struct drm_agp_buffer agp_req;
+ struct drm_agp_binding bind_req;
+
+ /* Acquire AGP. */
+ err = drm_legacy_agp_acquire(dev);
+ if (err) {
+ DRM_ERROR("Unable to acquire AGP: %d\n", err);
+ return err;
+ }
+
+ err = drm_legacy_agp_info(dev, &info);
+ if (err) {
+ DRM_ERROR("Unable to get AGP info: %d\n", err);
+ return err;
+ }
+
+ mode.mode = (info.mode & ~0x07) | dma_bs->agp_mode;
+ err = drm_legacy_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. */
+ agp_req.size = agp_size;
+ agp_req.type = 0;
+ err = drm_legacy_agp_alloc(dev, &agp_req);
+ if (err) {
+ dev_priv->agp_size = 0;
+ DRM_ERROR("Unable to allocate %uMB AGP memory\n",
+ dma_bs->agp_size);
+ return err;
+ }
+
+ dev_priv->agp_size = agp_size;
+ dev_priv->agp_handle = agp_req.handle;
+
+ bind_req.handle = agp_req.handle;
+ bind_req.offset = 0;
+ err = drm_legacy_agp_bind(dev, &bind_req);
+ if (err) {
+ DRM_ERROR("Unable to bind AGP memory: %d\n", err);
+ return err;
+ }
+
+ /* Make drm_legacy_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_legacy_addmap(dev, offset, warp_size,
+ _DRM_AGP, _DRM_READ_ONLY, &dev_priv->warp);
+ if (err) {
+ DRM_ERROR("Unable to map WARP microcode: %d\n", err);
+ return err;
+ }
+
+ offset += warp_size;
+ err = drm_legacy_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: %d\n", err);
+ return err;
+ }
+
+ offset += dma_bs->primary_size;
+ err = drm_legacy_addmap(dev, offset, secondary_size,
+ _DRM_AGP, 0, &dev->agp_buffer_map);
+ if (err) {
+ DRM_ERROR("Unable to map secondary DMA region: %d\n", err);
+ 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_legacy_addbufs_agp(dev, &req);
+ if (err) {
+ DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
+ return err;
+ }
+
+ {
+ struct drm_map_list *_entry;
+ unsigned long agp_token = 0;
+
+ list_for_each_entry(_entry, &dev->maplist, head) {
+ if (_entry->map == dev->agp_buffer_map)
+ agp_token = _entry->user_token;
+ }
+ if (!agp_token)
+ return -EFAULT;
+
+ dev->agp_buffer_token = agp_token;
+ }
+
+ offset += secondary_size;
+ err = drm_legacy_addmap(dev, offset, agp_size - offset,
+ _DRM_AGP, 0, &dev_priv->agp_textures);
+ if (err) {
+ DRM_ERROR("Unable to map AGP texture region %d\n", err);
+ return err;
+ }
+
+ drm_legacy_ioremap(dev_priv->warp, dev);
+ drm_legacy_ioremap(dev_priv->primary, dev);
+ drm_legacy_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 -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(struct drm_device *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
+ * decrease the request size by a single page each pass through the loop.
+ *
+ * \todo
+ * Determine whether the maximum address passed to drm_pci_alloc is correct.
+ * The same goes for drm_legacy_addbufs_pci.
+ *
+ * \sa mga_do_dma_bootstrap, mga_do_agp_dma_bootstrap
+ */
+static int mga_do_pci_dma_bootstrap(struct drm_device *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_UCODE_SIZE;
+ unsigned int primary_size;
+ unsigned int bin_count;
+ int err;
+ struct drm_buf_desc req;
+
+ if (dev->dma == NULL) {
+ DRM_ERROR("dev->dma is NULL\n");
+ return -EFAULT;
+ }
+
+ /* Make drm_legacy_addbufs happy by not trying to create a mapping for
+ * less than a page.
+ */
+ if (warp_size < PAGE_SIZE)
+ warp_size = PAGE_SIZE;
+
+ /* The proper alignment is 0x100 for this mapping */
+ err = drm_legacy_addmap(dev, 0, warp_size, _DRM_CONSISTENT,
+ _DRM_READ_ONLY, &dev_priv->warp);
+ if (err != 0) {
+ DRM_ERROR("Unable to create mapping for WARP microcode: %d\n",
+ err);
+ return err;
+ }
+
+ /* Other than the bottom two bits being used to encode other
+ * information, there don't appear to be any restrictions on the
+ * alignment of the primary or secondary DMA buffers.
+ */
+
+ for (primary_size = dma_bs->primary_size; primary_size != 0;
+ primary_size >>= 1) {
+ /* The proper alignment for this mapping is 0x04 */
+ err = drm_legacy_addmap(dev, 0, primary_size, _DRM_CONSISTENT,
+ _DRM_READ_ONLY, &dev_priv->primary);
+ if (!err)
+ break;
+ }
+
+ if (err != 0) {
+ DRM_ERROR("Unable to allocate primary DMA region: %d\n", err);
+ return -ENOMEM;
+ }
+
+ if (dev_priv->primary->size != dma_bs->primary_size) {
+ DRM_INFO("Primary DMA buffer size reduced from %u to %u.\n",
+ dma_bs->primary_size,
+ (unsigned)dev_priv->primary->size);
+ dma_bs->primary_size = dev_priv->primary->size;
+ }
+
+ for (bin_count = dma_bs->secondary_bin_count; bin_count > 0;
+ bin_count--) {
+ (void)memset(&req, 0, sizeof(req));
+ req.count = bin_count;
+ req.size = dma_bs->secondary_bin_size;
+
+ err = drm_legacy_addbufs_pci(dev, &req);
+ if (!err)
+ break;
+ }
+
+ if (bin_count == 0) {
+ DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
+ return err;
+ }
+
+ if (bin_count != dma_bs->secondary_bin_count) {
+ DRM_INFO("Secondary PCI DMA buffer bin count reduced from %u "
+ "to %u.\n", dma_bs->secondary_bin_count, bin_count);
+
+ dma_bs->secondary_bin_count = bin_count;
+ }
+
+ dev_priv->dma_access = 0;
+ dev_priv->wagp_enable = 0;
+
+ dma_bs->agp_mode = 0;
+
+ DRM_INFO("Initialized card for PCI DMA.\n");
+ return 0;
+}
+
+static int mga_do_dma_bootstrap(struct drm_device *dev,
+ drm_mga_dma_bootstrap_t *dma_bs)
+{
+ const int is_agp = (dma_bs->agp_mode != 0) && dev->agp;
+ int err;
+ drm_mga_private_t *const dev_priv =
+ (drm_mga_private_t *) dev->dev_private;
+
+ dev_priv->used_new_dma_init = 1;
+
+ /* The first steps are the same for both PCI and AGP based DMA. Map
+ * the cards MMIO registers and map a status page.
+ */
+ err = drm_legacy_addmap(dev, dev_priv->mmio_base, dev_priv->mmio_size,
+ _DRM_REGISTERS, _DRM_READ_ONLY,
+ &dev_priv->mmio);
+ if (err) {
+ DRM_ERROR("Unable to map MMIO region: %d\n", err);
+ return err;
+ }
+
+ err = drm_legacy_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
+ _DRM_READ_ONLY | _DRM_LOCKED | _DRM_KERNEL,
+ &dev_priv->status);
+ if (err) {
+ DRM_ERROR("Unable to map status region: %d\n", err);
+ return err;
+ }
+
+ /* The DMA initialization procedure is slightly different for PCI and
+ * AGP cards. AGP cards just allocate a large block of AGP memory and
+ * carve off portions of it for internal uses. The remaining memory
+ * is returned to user-mode to be used for AGP textures.
+ */
+ if (is_agp)
+ err = mga_do_agp_dma_bootstrap(dev, dma_bs);
+
+ /* If we attempted to initialize the card for AGP DMA but failed,
+ * clean-up any mess that may have been created.
+ */
+
+ if (err)
+ mga_do_cleanup_dma(dev, MINIMAL_CLEANUP);
+
+ /* Not only do we want to try and initialized PCI cards for PCI DMA,
+ * but we also try to initialized AGP cards that could not be
+ * initialized for AGP DMA. This covers the case where we have an AGP
+ * card in a system with an unsupported AGP chipset. In that case the
+ * card will be detected as AGP, but we won't be able to allocate any
+ * AGP memory, etc.
+ */
+
+ if (!is_agp || err)
+ err = mga_do_pci_dma_bootstrap(dev, dma_bs);
+
+ return err;
+}
+
+int mga_dma_bootstrap(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ drm_mga_dma_bootstrap_t *bootstrap = data;
+ int err;
+ static const int modes[] = { 0, 1, 2, 2, 4, 4, 4, 4 };
+ const drm_mga_private_t *const dev_priv =
+ (drm_mga_private_t *) dev->dev_private;
+
+ err = mga_do_dma_bootstrap(dev, bootstrap);
+ if (err) {
+ mga_do_cleanup_dma(dev, FULL_CLEANUP);
+ return err;
+ }
+
+ if (dev_priv->agp_textures != NULL) {
+ bootstrap->texture_handle = dev_priv->agp_textures->offset;
+ bootstrap->texture_size = dev_priv->agp_textures->size;
+ } else {
+ bootstrap->texture_handle = 0;
+ bootstrap->texture_size = 0;
+ }
+
+ bootstrap->agp_mode = modes[bootstrap->agp_mode & 0x07];
+
+ return err;
+}
+
+static int mga_do_init_dma(struct drm_device *dev, drm_mga_init_t *init)
+{
+ drm_mga_private_t *dev_priv;
+ int ret;
+ DRM_DEBUG("\n");
+
+ dev_priv = dev->dev_private;
+
+ if (init->sgram)
+ dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
+ else
+ dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
+ dev_priv->maccess = init->maccess;
+
+ dev_priv->fb_cpp = init->fb_cpp;
+ dev_priv->front_offset = init->front_offset;
+ dev_priv->front_pitch = init->front_pitch;
+ dev_priv->back_offset = init->back_offset;
+ dev_priv->back_pitch = init->back_pitch;
+
+ dev_priv->depth_cpp = init->depth_cpp;
+ dev_priv->depth_offset = init->depth_offset;
+ dev_priv->depth_pitch = init->depth_pitch;
+
+ /* FIXME: Need to support AGP textures...
+ */
+ dev_priv->texture_offset = init->texture_offset[0];
+ dev_priv->texture_size = init->texture_size[0];
+
+ dev_priv->sarea = drm_legacy_getsarea(dev);
+ if (!dev_priv->sarea) {
+ DRM_ERROR("failed to find sarea!\n");
+ return -EINVAL;
+ }
+
+ if (!dev_priv->used_new_dma_init) {
+
+ dev_priv->dma_access = MGA_PAGPXFER;
+ dev_priv->wagp_enable = MGA_WAGP_ENABLE;
+
+ dev_priv->status = drm_legacy_findmap(dev, init->status_offset);
+ if (!dev_priv->status) {
+ DRM_ERROR("failed to find status page!\n");
+ return -EINVAL;
+ }
+ dev_priv->mmio = drm_legacy_findmap(dev, init->mmio_offset);
+ if (!dev_priv->mmio) {
+ DRM_ERROR("failed to find mmio region!\n");
+ return -EINVAL;
+ }
+ dev_priv->warp = drm_legacy_findmap(dev, init->warp_offset);
+ if (!dev_priv->warp) {
+ DRM_ERROR("failed to find warp microcode region!\n");
+ return -EINVAL;
+ }
+ dev_priv->primary = drm_legacy_findmap(dev, init->primary_offset);
+ if (!dev_priv->primary) {
+ DRM_ERROR("failed to find primary dma region!\n");
+ return -EINVAL;
+ }
+ dev->agp_buffer_token = init->buffers_offset;
+ dev->agp_buffer_map =
+ drm_legacy_findmap(dev, init->buffers_offset);
+ if (!dev->agp_buffer_map) {
+ DRM_ERROR("failed to find dma buffer region!\n");
+ return -EINVAL;
+ }
+
+ drm_legacy_ioremap(dev_priv->warp, dev);
+ drm_legacy_ioremap(dev_priv->primary, dev);
+ drm_legacy_ioremap(dev->agp_buffer_map, dev);
+ }
+
+ dev_priv->sarea_priv =
+ (drm_mga_sarea_t *) ((u8 *) dev_priv->sarea->handle +
+ init->sarea_priv_offset);
+
+ if (!dev_priv->warp->handle ||
+ !dev_priv->primary->handle ||
+ ((dev_priv->dma_access != 0) &&
+ ((dev->agp_buffer_map == NULL) ||
+ (dev->agp_buffer_map->handle == NULL)))) {
+ DRM_ERROR("failed to ioremap agp regions!\n");
+ return -ENOMEM;
+ }
+
+ ret = mga_warp_install_microcode(dev_priv);
+ if (ret < 0) {
+ DRM_ERROR("failed to install WARP ucode!: %d\n", ret);
+ return ret;
+ }
+
+ ret = mga_warp_init(dev_priv);
+ if (ret < 0) {
+ DRM_ERROR("failed to init WARP engine!: %d\n", ret);
+ return ret;
+ }
+
+ dev_priv->prim.status = (u32 *) dev_priv->status->handle;
+
+ mga_do_wait_for_idle(dev_priv);
+
+ /* Init the primary DMA registers.
+ */
+ MGA_WRITE(MGA_PRIMADDRESS, dev_priv->primary->offset | MGA_DMA_GENERAL);
+#if 0
+ MGA_WRITE(MGA_PRIMPTR, virt_to_bus((void *)dev_priv->prim.status) | MGA_PRIMPTREN0 | /* Soft trap, SECEND, SETUPEND */
+ MGA_PRIMPTREN1); /* DWGSYNC */
+#endif
+
+ dev_priv->prim.start = (u8 *) dev_priv->primary->handle;
+ dev_priv->prim.end = ((u8 *) dev_priv->primary->handle
+ + dev_priv->primary->size);
+ dev_priv->prim.size = dev_priv->primary->size;
+
+ dev_priv->prim.tail = 0;
+ dev_priv->prim.space = dev_priv->prim.size;
+ dev_priv->prim.wrapped = 0;
+
+ dev_priv->prim.last_flush = 0;
+ dev_priv->prim.last_wrap = 0;
+
+ dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
+
+ dev_priv->prim.status[0] = dev_priv->primary->offset;
+ dev_priv->prim.status[1] = 0;
+
+ dev_priv->sarea_priv->last_wrap = 0;
+ dev_priv->sarea_priv->last_frame.head = 0;
+ dev_priv->sarea_priv->last_frame.wrap = 0;
+
+ if (mga_freelist_init(dev, dev_priv) < 0) {
+ DRM_ERROR("could not initialize freelist\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup)
+{
+ int err = 0;
+ DRM_DEBUG("\n");
+
+ /* Make sure interrupts are disabled here because the uninstall ioctl
+ * may not have been called from userspace and after dev_private
+ * is freed, it's too late.
+ */
+ if (dev->irq_enabled)
+ drm_legacy_irq_uninstall(dev);
+
+ if (dev->dev_private) {
+ drm_mga_private_t *dev_priv = dev->dev_private;
+
+ if ((dev_priv->warp != NULL)
+ && (dev_priv->warp->type != _DRM_CONSISTENT))
+ drm_legacy_ioremapfree(dev_priv->warp, dev);
+
+ if ((dev_priv->primary != NULL)
+ && (dev_priv->primary->type != _DRM_CONSISTENT))
+ drm_legacy_ioremapfree(dev_priv->primary, dev);
+
+ if (dev->agp_buffer_map != NULL)
+ drm_legacy_ioremapfree(dev->agp_buffer_map, dev);
+
+ if (dev_priv->used_new_dma_init) {
+#if IS_ENABLED(CONFIG_AGP)
+ if (dev_priv->agp_handle != 0) {
+ struct drm_agp_binding unbind_req;
+ struct drm_agp_buffer free_req;
+
+ unbind_req.handle = dev_priv->agp_handle;
+ drm_legacy_agp_unbind(dev, &unbind_req);
+
+ free_req.handle = dev_priv->agp_handle;
+ drm_legacy_agp_free(dev, &free_req);
+
+ dev_priv->agp_textures = NULL;
+ dev_priv->agp_size = 0;
+ dev_priv->agp_handle = 0;
+ }
+
+ if ((dev->agp != NULL) && dev->agp->acquired)
+ err = drm_legacy_agp_release(dev);
+#endif
+ }
+
+ dev_priv->warp = NULL;
+ dev_priv->primary = NULL;
+ dev_priv->sarea = NULL;
+ dev_priv->sarea_priv = NULL;
+ dev->agp_buffer_map = NULL;
+
+ if (full_cleanup) {
+ dev_priv->mmio = NULL;
+ dev_priv->status = NULL;
+ dev_priv->used_new_dma_init = 0;
+ }
+
+ memset(&dev_priv->prim, 0, sizeof(dev_priv->prim));
+ dev_priv->warp_pipe = 0;
+ memset(dev_priv->warp_pipe_phys, 0,
+ sizeof(dev_priv->warp_pipe_phys));
+
+ if (dev_priv->head != NULL)
+ mga_freelist_cleanup(dev);
+ }
+
+ return err;
+}
+
+int mga_dma_init(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ drm_mga_init_t *init = data;
+ int err;
+
+ LOCK_TEST_WITH_RETURN(dev, file_priv);
+
+ switch (init->func) {
+ case MGA_INIT_DMA:
+ err = mga_do_init_dma(dev, init);
+ if (err)
+ (void)mga_do_cleanup_dma(dev, FULL_CLEANUP);
+ return err;
+ case MGA_CLEANUP_DMA:
+ return mga_do_cleanup_dma(dev, FULL_CLEANUP);
+ }
+
+ return -EINVAL;
+}
+
+/* ================================================================
+ * Primary DMA stream management
+ */
+
+int mga_dma_flush(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+ struct drm_lock *lock = data;
+
+ LOCK_TEST_WITH_RETURN(dev, file_priv);
+
+ DRM_DEBUG("%s%s%s\n",
+ (lock->flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
+ (lock->flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
+ (lock->flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "");
+
+ WRAP_WAIT_WITH_RETURN(dev_priv);
+
+ if (lock->flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL))
+ mga_do_dma_flush(dev_priv);
+
+ if (lock->flags & _DRM_LOCK_QUIESCENT) {
+#if MGA_DMA_DEBUG
+ int ret = mga_do_wait_for_idle(dev_priv);
+ if (ret < 0)
+ DRM_INFO("-EBUSY\n");
+ return ret;
+#else
+ return mga_do_wait_for_idle(dev_priv);
+#endif
+ } else {
+ return 0;
+ }
+}
+
+int mga_dma_reset(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+
+ LOCK_TEST_WITH_RETURN(dev, file_priv);
+
+ return mga_do_dma_reset(dev_priv);
+}
+
+/* ================================================================
+ * DMA buffer management
+ */
+
+static int mga_dma_get_buffers(struct drm_device *dev,
+ struct drm_file *file_priv, struct drm_dma *d)
+{
+ struct drm_buf *buf;
+ int i;
+
+ for (i = d->granted_count; i < d->request_count; i++) {
+ buf = mga_freelist_get(dev);
+ if (!buf)
+ return -EAGAIN;
+
+ buf->file_priv = file_priv;
+
+ if (copy_to_user(&d->request_indices[i],
+ &buf->idx, sizeof(buf->idx)))
+ return -EFAULT;
+ if (copy_to_user(&d->request_sizes[i],
+ &buf->total, sizeof(buf->total)))
+ return -EFAULT;
+
+ d->granted_count++;
+ }
+ return 0;
+}
+
+int mga_dma_buffers(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_device_dma *dma = dev->dma;
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+ struct drm_dma *d = data;
+ int ret = 0;
+
+ LOCK_TEST_WITH_RETURN(dev, file_priv);
+
+ /* Please don't send us buffers.
+ */
+ if (d->send_count != 0) {
+ DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
+ task_pid_nr(current), d->send_count);
+ return -EINVAL;
+ }
+
+ /* We'll send you buffers.
+ */
+ if (d->request_count < 0 || d->request_count > dma->buf_count) {
+ DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
+ task_pid_nr(current), d->request_count,
+ dma->buf_count);
+ return -EINVAL;
+ }
+
+ WRAP_TEST_WITH_RETURN(dev_priv);
+
+ d->granted_count = 0;
+
+ if (d->request_count)
+ ret = mga_dma_get_buffers(dev, file_priv, d);
+
+ return ret;
+}
+
+/*
+ * Called just before the module is unloaded.
+ */
+void mga_driver_unload(struct drm_device *dev)
+{
+ kfree(dev->dev_private);
+ dev->dev_private = NULL;
+}
+
+/*
+ * Called when the last opener of the device is closed.
+ */
+void mga_driver_lastclose(struct drm_device *dev)
+{
+ mga_do_cleanup_dma(dev, FULL_CLEANUP);
+}
+
+int mga_driver_dma_quiescent(struct drm_device *dev)
+{
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ return mga_do_wait_for_idle(dev_priv);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 12:54:43 +0000