diff options
Diffstat (limited to 'shared/via_dma.c')
| -rw-r--r-- | shared/via_dma.c | 517 |
1 files changed, 517 insertions, 0 deletions
diff --git a/shared/via_dma.c b/shared/via_dma.c new file mode 100644 index 00000000..9b913f36 --- /dev/null +++ b/shared/via_dma.c @@ -0,0 +1,517 @@ +/* via_dma.c -- DMA support for the VIA Unichrome/Pro + */ +/************************************************************************** + * + * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas. + * All Rights Reserved. + * + * Copyright 2004 Digeo, Inc., Palo Alto, CA, U.S.A. + * All Rights Reserved. + * + **************************************************************************/ + +#define __NO_VERSION__ +#include "via.h" +#include "drmP.h" +#include "drm.h" +#include "via_drm.h" +#include "via_drv.h" + + + + +static inline uint32_t * via_check_dma(drm_via_private_t * dev_priv, + unsigned int size); +static void via_cmdbuf_start(drm_via_private_t * dev_priv); +static void via_cmdbuf_pause(drm_via_private_t * dev_priv); +static void via_cmdbuf_reset(drm_via_private_t * dev_priv); +static void via_cmdbuf_rewind(drm_via_private_t * dev_priv); +static int via_wait_idle(drm_via_private_t * dev_priv); + + +int via_dma_cleanup(drm_device_t *dev) +{ + if (dev->dev_private) { + drm_via_private_t *dev_priv = + (drm_via_private_t *) dev->dev_private; + + if (dev_priv->ring.virtual_start) { + via_cmdbuf_reset(dev_priv); + + drm_core_ioremapfree( &dev_priv->ring.map, dev); + dev_priv->ring.virtual_start = NULL; + } + } + + return 0; +} + + +static int via_initialize(drm_device_t *dev, + drm_via_private_t *dev_priv, + drm_via_dma_init_t *init) +{ + if (!dev_priv || !dev_priv->mmio) { + DRM_ERROR("via_dma_init called before via_map_init\n"); + return DRM_ERR(EFAULT); + } + + if (dev_priv->ring.virtual_start != NULL) { + DRM_ERROR("%s called again without calling cleanup\n", + __FUNCTION__); + return DRM_ERR(EFAULT); + } + + dev_priv->ring.map.offset = dev->agp->base + init->offset; + dev_priv->ring.map.size = init->size; + dev_priv->ring.map.type = 0; + dev_priv->ring.map.flags = 0; + dev_priv->ring.map.mtrr = 0; + + drm_core_ioremap( &dev_priv->ring.map, dev ); + + if (dev_priv->ring.map.handle == NULL) { + via_dma_cleanup(dev); + DRM_ERROR("can not ioremap virtual address for" + " ring buffer\n"); + return DRM_ERR(ENOMEM); + } + + dev_priv->ring.virtual_start = dev_priv->ring.map.handle; + + dev_priv->dma_ptr = dev_priv->ring.virtual_start; + dev_priv->dma_low = 0; + dev_priv->dma_high = init->size; + dev_priv->dma_offset = init->offset; + dev_priv->last_pause_ptr = NULL; + dev_priv->hw_addr_ptr = dev_priv->mmio->handle + init->reg_pause_addr; + + via_cmdbuf_start(dev_priv); + + return 0; +} + + +int via_dma_init( DRM_IOCTL_ARGS ) +{ + DRM_DEVICE; + drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; + drm_via_dma_init_t init; + int retcode = 0; + + DRM_COPY_FROM_USER_IOCTL(init, (drm_via_dma_init_t *)data, sizeof(init)); + + switch(init.func) { + case VIA_INIT_DMA: + retcode = via_initialize(dev, dev_priv, &init); + break; + case VIA_CLEANUP_DMA: + retcode = via_dma_cleanup(dev); + break; + default: + retcode = DRM_ERR(EINVAL); + break; + } + + return retcode; +} + + +static int via_dispatch_cmdbuffer(drm_device_t *dev, + drm_via_cmdbuffer_t *cmd ) +{ + drm_via_private_t *dev_priv = dev->dev_private; + uint32_t * vb; + vb = via_check_dma(dev_priv, cmd->size); + if (vb == NULL) { + return DRM_ERR(EAGAIN); + } + DRM_COPY_FROM_USER(vb, cmd->buf, cmd->size); + dev_priv->dma_low += cmd->size; + via_cmdbuf_pause(dev_priv); + + return 0; +} + + +static int via_quiescent(drm_device_t *dev) +{ + drm_via_private_t *dev_priv = dev->dev_private; + + if (!via_wait_idle(dev_priv)) { + return DRM_ERR(EAGAIN); + } + return 0; +} + + +int via_flush_ioctl( DRM_IOCTL_ARGS ) +{ + DRM_DEVICE; + + if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) { + DRM_ERROR("via_flush_ioctl called without lock held\n"); + return DRM_ERR(EINVAL); + } + + return via_quiescent(dev); +} + + +int via_cmdbuffer( DRM_IOCTL_ARGS ) +{ + DRM_DEVICE; + drm_via_cmdbuffer_t cmdbuf; + int ret; + + DRM_COPY_FROM_USER_IOCTL( cmdbuf, (drm_via_cmdbuffer_t *)data, + sizeof(cmdbuf) ); + + DRM_DEBUG("via cmdbuffer, buf %p size %lu\n", cmdbuf.buf, cmdbuf.size); + + if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) { + DRM_ERROR("via_cmdbuffer called without lock held\n"); + return DRM_ERR(EINVAL); + } + + ret = via_dispatch_cmdbuffer( dev, &cmdbuf ); + if (ret) { + return ret; + } + + return 0; +} + + + + +/************************************************************************/ +#include "via_3d_reg.h" + +#define CMDBUF_ALIGNMENT_SIZE (0x100) +#define CMDBUF_ALIGNMENT_MASK (0xff) + +/* defines for VIA 3D registers */ +#define VIA_REG_STATUS 0x400 +#define VIA_REG_TRANSET 0x43C +#define VIA_REG_TRANSPACE 0x440 + +/* VIA_REG_STATUS(0x400): Engine Status */ +#define VIA_CMD_RGTR_BUSY 0x00000080 /* Command Regulator is busy */ +#define VIA_2D_ENG_BUSY 0x00000001 /* 2D Engine is busy */ +#define VIA_3D_ENG_BUSY 0x00000002 /* 3D Engine is busy */ +#define VIA_VR_QUEUE_BUSY 0x00020000 /* Virtual Queue is busy */ + + +#define SetReg2DAGP(nReg, nData) { \ + *((uint32_t *)(vb)) = ((nReg) >> 2) | 0xF0000000; \ + *((uint32_t *)(vb) + 1) = (nData); \ + vb = ((uint32_t *)vb) + 2; \ + dev_priv->dma_low +=8; \ +} + +static uint32_t via_swap_count = 0; + +static inline uint32_t * +via_align_buffer(drm_via_private_t * dev_priv, uint32_t * vb, int qw_count) +{ + for ( ; qw_count > 0; --qw_count) { + *vb++ = (0xcc000000 | (dev_priv->dma_low & 0xffffff)); + *vb++ = (0xdd400000 | via_swap_count); + dev_priv->dma_low += 8; + } + via_swap_count = (via_swap_count + 1) & 0xffff; + return vb; +} + +static inline int +via_cmdbuf_wait(drm_via_private_t * dev_priv, unsigned int size) +{ + uint32_t agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr; + uint32_t cur_addr, hw_addr, next_addr; + volatile uint32_t * hw_addr_ptr; + uint32_t count; + hw_addr_ptr = dev_priv->hw_addr_ptr; + cur_addr = agp_base + dev_priv->dma_low; + /* At high resolution (i.e. 1280x1024) and with high workload within + * a short commmand stream, the following test will fail. It may be + * that the engine is too busy to update hw_addr. Therefore, add + * a large 64KB window between buffer head and tail. + */ + next_addr = cur_addr + size + 64 * 1024; + count = 1000000; /* How long is this? */ + do { + hw_addr = *hw_addr_ptr; + if (count-- == 0) { + DRM_ERROR("via_cmdbuf_wait timed out hw %x dma_low %x\n", + hw_addr, dev_priv->dma_low); + return -1; + } + } while ((cur_addr < hw_addr) && (next_addr >= hw_addr)); + return 0; +} + +/* + * Checks whether buffer head has reach the end. Rewind the ring buffer + * when necessary. + * + * Returns virtual pointer to ring buffer. + */ +static inline uint32_t * +via_check_dma(drm_via_private_t * dev_priv, unsigned int size) +{ + if ((dev_priv->dma_low + size + 0x400) > dev_priv->dma_high) { + via_cmdbuf_rewind(dev_priv); + } + if (via_cmdbuf_wait(dev_priv, size) != 0) { + return NULL; + } + + return (uint32_t*)(dev_priv->dma_ptr + dev_priv->dma_low); +} + +/* + * This function is used internally by ring buffer mangement code. + * + * Returns virtual pointer to ring buffer. + */ +static inline uint32_t * via_get_dma(drm_via_private_t * dev_priv) +{ + return (uint32_t*)(dev_priv->dma_ptr + dev_priv->dma_low); +} + + +static int via_wait_idle(drm_via_private_t * dev_priv) +{ + int count = 10000000; + while (count-- && (VIA_READ(VIA_REG_STATUS) & + (VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY | VIA_3D_ENG_BUSY))); + return count; +} + +static inline void +via_dummy_bitblt(drm_via_private_t * dev_priv) +{ + uint32_t * vb = via_get_dma(dev_priv); + /* GEDST*/ + SetReg2DAGP(0x0C, (0 | (0 << 16))); + /* GEWD*/ + SetReg2DAGP(0x10, 0 | (0 << 16)); + /* BITBLT*/ + SetReg2DAGP(0x0, 0x1 | 0x2000 | 0xAA000000); +} + +static void via_cmdbuf_start(drm_via_private_t * dev_priv) +{ + uint32_t agp_base; + uint32_t pause_addr, pause_addr_lo, pause_addr_hi; + uint32_t start_addr, start_addr_lo; + uint32_t end_addr, end_addr_lo; + uint32_t qw_pad_count; + uint32_t command; + uint32_t * vb; + + dev_priv->dma_low = 0; + vb = via_get_dma(dev_priv); + + agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr; + start_addr = agp_base; + end_addr = agp_base + dev_priv->dma_high; + + start_addr_lo = ((HC_SubA_HAGPBstL << 24) | (start_addr & 0xFFFFFF)); + end_addr_lo = ((HC_SubA_HAGPBendL << 24) | (end_addr & 0xFFFFFF)); + command = ((HC_SubA_HAGPCMNT << 24) | (start_addr >> 24) | + ((end_addr & 0xff000000) >> 16)); + + *vb++ = HC_HEADER2 | ((VIA_REG_TRANSET>>2)<<12) | + (VIA_REG_TRANSPACE>>2); + *vb++ = (HC_ParaType_PreCR<<16); + dev_priv->dma_low += 8; + + qw_pad_count = (CMDBUF_ALIGNMENT_SIZE>>3) - + ((dev_priv->dma_low & CMDBUF_ALIGNMENT_MASK) >> 3); + + pause_addr = agp_base + dev_priv->dma_low - 8 + (qw_pad_count<<3); + pause_addr_lo = ((HC_SubA_HAGPBpL<<24) | + HC_HAGPBpID_PAUSE | + (pause_addr & 0xffffff)); + pause_addr_hi = ((HC_SubA_HAGPBpH<<24) | (pause_addr >> 24)); + + vb = via_align_buffer(dev_priv, vb, qw_pad_count-1); + + *vb++ = pause_addr_hi; + *vb++ = pause_addr_lo; + dev_priv->dma_low += 8; + dev_priv->last_pause_ptr = vb-1; + + VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16)); + VIA_WRITE(VIA_REG_TRANSPACE, command); + VIA_WRITE(VIA_REG_TRANSPACE, start_addr_lo); + VIA_WRITE(VIA_REG_TRANSPACE, end_addr_lo); + + VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi); + VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo); + + VIA_WRITE(VIA_REG_TRANSPACE, command | HC_HAGPCMNT_MASK); +} + +static void via_cmdbuf_jump(drm_via_private_t * dev_priv) +{ + uint32_t agp_base; + uint32_t pause_addr, pause_addr_lo, pause_addr_hi; + uint32_t start_addr; + uint32_t end_addr, end_addr_lo; + uint32_t * vb; + uint32_t qw_pad_count; + uint32_t command; + uint32_t jump_addr, jump_addr_lo, jump_addr_hi; + + /* Seems like Unichrome has bug that when the PAUSE register is + * set in the AGP command stream immediately after a PCI write to + * the same register, the command regulator goes into a looping + * state. Prepending a BitBLT command to stall the command + * regulator for a moment seems to solve the problem. + */ + via_cmdbuf_wait(dev_priv, 48); + via_dummy_bitblt(dev_priv); + + via_cmdbuf_wait(dev_priv, 2*CMDBUF_ALIGNMENT_SIZE); + + /* At end of buffer, rewind with a JUMP command. */ + vb = via_get_dma(dev_priv); + + *vb++ = HC_HEADER2 | ((VIA_REG_TRANSET>>2)<<12) | + (VIA_REG_TRANSPACE>>2); + *vb++ = (HC_ParaType_PreCR<<16); + dev_priv->dma_low += 8; + + qw_pad_count = (CMDBUF_ALIGNMENT_SIZE>>3) - + ((dev_priv->dma_low & CMDBUF_ALIGNMENT_MASK) >> 3); + + agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr; + start_addr = agp_base; + end_addr = agp_base + dev_priv->dma_low - 8 + (qw_pad_count<<3); + + jump_addr = end_addr; + jump_addr_lo = ((HC_SubA_HAGPBpL<<24) | HC_HAGPBpID_JUMP | + (jump_addr & 0xffffff)); + jump_addr_hi = ((HC_SubA_HAGPBpH<<24) | (jump_addr >> 24)); + + end_addr_lo = ((HC_SubA_HAGPBendL << 24) | (end_addr & 0xFFFFFF)); + command = ((HC_SubA_HAGPCMNT << 24) | (start_addr >> 24) | + ((end_addr & 0xff000000) >> 16)); + + *vb++ = command; + *vb++ = end_addr_lo; + dev_priv->dma_low += 8; + + vb = via_align_buffer(dev_priv, vb, qw_pad_count-1); + + + /* Now at beginning of buffer, make sure engine will pause here. */ + dev_priv->dma_low = 0; + if (via_cmdbuf_wait(dev_priv, CMDBUF_ALIGNMENT_SIZE) != 0) { + DRM_ERROR("via_cmdbuf_jump failed\n"); + } + vb = via_get_dma(dev_priv); + + end_addr = agp_base + dev_priv->dma_high; + + end_addr_lo = ((HC_SubA_HAGPBendL << 24) | (end_addr & 0xFFFFFF)); + command = ((HC_SubA_HAGPCMNT << 24) | (start_addr >> 24) | + ((end_addr & 0xff000000) >> 16)); + + qw_pad_count = (CMDBUF_ALIGNMENT_SIZE>>3) - + ((dev_priv->dma_low & CMDBUF_ALIGNMENT_MASK) >> 3); + + pause_addr = agp_base + dev_priv->dma_low - 8 + (qw_pad_count<<3); + pause_addr_lo = ((HC_SubA_HAGPBpL<<24) | HC_HAGPBpID_PAUSE | + (pause_addr & 0xffffff)); + pause_addr_hi = ((HC_SubA_HAGPBpH<<24) | (pause_addr >> 24)); + + *vb++ = HC_HEADER2 | ((VIA_REG_TRANSET>>2)<<12) | + (VIA_REG_TRANSPACE>>2); + *vb++ = (HC_ParaType_PreCR<<16); + dev_priv->dma_low += 8; + + *vb++ = pause_addr_hi; + *vb++ = pause_addr_lo; + dev_priv->dma_low += 8; + + *vb++ = command; + *vb++ = end_addr_lo; + dev_priv->dma_low += 8; + + vb = via_align_buffer(dev_priv, vb, qw_pad_count - 4); + + *vb++ = pause_addr_hi; + *vb++ = pause_addr_lo; + dev_priv->dma_low += 8; + + *dev_priv->last_pause_ptr = jump_addr_lo; + dev_priv->last_pause_ptr = vb-1; + + if (VIA_READ(0x41c) & 0x80000000) { + VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16)); + VIA_WRITE(VIA_REG_TRANSPACE, jump_addr_hi); + VIA_WRITE(VIA_REG_TRANSPACE, jump_addr_lo); + } +} + +static void via_cmdbuf_rewind(drm_via_private_t * dev_priv) +{ + via_cmdbuf_pause(dev_priv); + via_cmdbuf_jump(dev_priv); +} + +static void via_cmdbuf_flush(drm_via_private_t * dev_priv, uint32_t cmd_type) +{ + uint32_t agp_base; + uint32_t pause_addr, pause_addr_lo, pause_addr_hi; + uint32_t * vb; + uint32_t qw_pad_count; + + via_cmdbuf_wait(dev_priv, 0x200); + + vb = via_get_dma(dev_priv); + *vb++ = HC_HEADER2 | ((VIA_REG_TRANSET>>2)<<12) | + (VIA_REG_TRANSPACE>>2); + *vb++ = (HC_ParaType_PreCR<<16); + dev_priv->dma_low += 8; + + agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr; + qw_pad_count = (CMDBUF_ALIGNMENT_SIZE>>3) - + ((dev_priv->dma_low & CMDBUF_ALIGNMENT_MASK) >> 3); + + pause_addr = agp_base + dev_priv->dma_low - 8 + (qw_pad_count<<3); + pause_addr_lo = ((HC_SubA_HAGPBpL<<24) | cmd_type | + (pause_addr & 0xffffff)); + pause_addr_hi = ((HC_SubA_HAGPBpH<<24) | (pause_addr >> 24)); + + vb = via_align_buffer(dev_priv, vb, qw_pad_count-1); + + *vb++ = pause_addr_hi; + *vb++ = pause_addr_lo; + dev_priv->dma_low += 8; + *dev_priv->last_pause_ptr = pause_addr_lo; + dev_priv->last_pause_ptr = vb-1; + + if (VIA_READ(0x41c) & 0x80000000) { + VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16)); + VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi); + VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo); + } +} + +static void via_cmdbuf_pause(drm_via_private_t * dev_priv) +{ + via_cmdbuf_flush(dev_priv, HC_HAGPBpID_PAUSE); +} + +static void via_cmdbuf_reset(drm_via_private_t * dev_priv) +{ + via_cmdbuf_flush(dev_priv, HC_HAGPBpID_STOP); + via_wait_idle(dev_priv); +} + +/************************************************************************/ |