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789c9d33db
freebsd-dev/sys/dev/drm/mach64_dma.c
Eitan Adler 789c9d33db Remove always-true conditions from if statement. 
PR:		kern/176712
Submitted by:	Hiren Panchasara <hiren.panchasara@gmail.com>
Approved by:	cperciva (mentor)
2013-04-23 13:02:55 +00:00

1782 lines
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/* mach64_dma.c -- DMA support for mach64 (Rage Pro) driver -*- linux-c -*- */
/**
* \file mach64_dma.c
* DMA support for mach64 (Rage Pro) driver
*
* \author Gareth Hughes <gareth@valinux.com>
* \author Frank C. Earl <fearl@airmail.net>
* \author Leif Delgass <ldelgass@retinalburn.net>
* \author José Fonseca <j_r_fonseca@yahoo.co.uk>
*/
/*-
* Copyright 2000 Gareth Hughes
* Copyright 2002 Frank C. Earl
* Copyright 2002-2003 Leif Delgass
* 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
* THE COPYRIGHT OWNER(S) 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "dev/drm/drmP.h"
#include "dev/drm/drm.h"
#include "dev/drm/mach64_drm.h"
#include "dev/drm/mach64_drv.h"
/*******************************************************************/
/** \name Engine, FIFO control */
/*@{*/
/**
* Waits for free entries in the FIFO.
*
* \note Most writes to Mach64 registers are automatically routed through
* command FIFO which is 16 entry deep. Prior to writing to any draw engine
* register one has to ensure that enough FIFO entries are available by calling
* this function. Failure to do so may cause the engine to lock.
*
* \param dev_priv pointer to device private data structure.
* \param entries number of free entries in the FIFO to wait for.
*
* \returns zero on success, or -EBUSY if the timeout (specificed by
* drm_mach64_private::usec_timeout) occurs.
*/
int mach64_do_wait_for_fifo(drm_mach64_private_t *dev_priv, int entries)
{
int slots = 0, i;
for (i = 0; i < dev_priv->usec_timeout; i++) {
slots = (MACH64_READ(MACH64_FIFO_STAT) & MACH64_FIFO_SLOT_MASK);
if (slots <= (0x8000 >> entries))
return 0;
DRM_UDELAY(1);
}
DRM_INFO("failed! slots=%d entries=%d\n", slots, entries);
return -EBUSY;
}
/**
* Wait for the draw engine to be idle.
*/
int mach64_do_wait_for_idle(drm_mach64_private_t *dev_priv)
{
int i, ret;
ret = mach64_do_wait_for_fifo(dev_priv, 16);
if (ret < 0)
return ret;
for (i = 0; i < dev_priv->usec_timeout; i++) {
if (!(MACH64_READ(MACH64_GUI_STAT) & MACH64_GUI_ACTIVE))
return 0;
DRM_UDELAY(1);
}
DRM_INFO("failed! GUI_STAT=0x%08x\n", MACH64_READ(MACH64_GUI_STAT));
mach64_dump_ring_info(dev_priv);
return -EBUSY;
}
/**
* Wait for free entries in the ring buffer.
*
* The Mach64 bus master can be configured to act as a virtual FIFO, using a
* circular buffer (commonly referred as "ring buffer" in other drivers) with
* pointers to engine commands. This allows the CPU to do other things while
* the graphics engine is busy, i.e., DMA mode.
*
* This function should be called before writing new entries to the ring
* buffer.
*
* \param dev_priv pointer to device private data structure.
* \param n number of free entries in the ring buffer to wait for.
*
* \returns zero on success, or -EBUSY if the timeout (specificed by
* drm_mach64_private_t::usec_timeout) occurs.
*
* \sa mach64_dump_ring_info()
*/
int mach64_wait_ring(drm_mach64_private_t *dev_priv, int n)
{
drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
int i;
for (i = 0; i < dev_priv->usec_timeout; i++) {
mach64_update_ring_snapshot(dev_priv);
if (ring->space >= n) {
if (i > 0)
DRM_DEBUG("%d usecs\n", i);
return 0;
}
DRM_UDELAY(1);
}
/* FIXME: This is being ignored... */
DRM_ERROR("failed!\n");
mach64_dump_ring_info(dev_priv);
return -EBUSY;
}
/**
* Wait until all DMA requests have been processed...
*
* \sa mach64_wait_ring()
*/
static int mach64_ring_idle(drm_mach64_private_t *dev_priv)
{
drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
u32 head;
int i;
head = ring->head;
i = 0;
while (i < dev_priv->usec_timeout) {
mach64_update_ring_snapshot(dev_priv);
if (ring->head == ring->tail &&
!(MACH64_READ(MACH64_GUI_STAT) & MACH64_GUI_ACTIVE)) {
if (i > 0)
DRM_DEBUG("%d usecs\n", i);
return 0;
}
if (ring->head == head) {
++i;
} else {
head = ring->head;
i = 0;
}
DRM_UDELAY(1);
}
DRM_INFO("failed! GUI_STAT=0x%08x\n", MACH64_READ(MACH64_GUI_STAT));
mach64_dump_ring_info(dev_priv);
return -EBUSY;
}
/**
* Reset the ring buffer descriptors.
*
* \sa mach64_do_engine_reset()
*/
static void mach64_ring_reset(drm_mach64_private_t *dev_priv)
{
drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
mach64_do_release_used_buffers(dev_priv);
ring->head_addr = ring->start_addr;
ring->head = ring->tail = 0;
ring->space = ring->size;
MACH64_WRITE(MACH64_BM_GUI_TABLE_CMD,
ring->head_addr | MACH64_CIRCULAR_BUF_SIZE_16KB);
dev_priv->ring_running = 0;
}
/**
* Ensure the all the queued commands will be processed.
*/
int mach64_do_dma_flush(drm_mach64_private_t *dev_priv)
{
/* FIXME: It's not necessary to wait for idle when flushing
* we just need to ensure the ring will be completely processed
* in finite time without another ioctl
*/
return mach64_ring_idle(dev_priv);
}
/**
* Stop all DMA activity.
*/
int mach64_do_dma_idle(drm_mach64_private_t *dev_priv)
{
int ret;
/* wait for completion */
if ((ret = mach64_ring_idle(dev_priv)) < 0) {
DRM_ERROR("failed BM_GUI_TABLE=0x%08x tail: %u\n",
MACH64_READ(MACH64_BM_GUI_TABLE),
dev_priv->ring.tail);
return ret;
}
mach64_ring_stop(dev_priv);
/* clean up after pass */
mach64_do_release_used_buffers(dev_priv);
return 0;
}
/**
* Reset the engine. This will stop the DMA if it is running.
*/
int mach64_do_engine_reset(drm_mach64_private_t *dev_priv)
{
u32 tmp;
DRM_DEBUG("\n");
/* Kill off any outstanding DMA transfers.
*/
tmp = MACH64_READ(MACH64_BUS_CNTL);
MACH64_WRITE(MACH64_BUS_CNTL, tmp | MACH64_BUS_MASTER_DIS);
/* Reset the GUI engine (high to low transition).
*/
tmp = MACH64_READ(MACH64_GEN_TEST_CNTL);
MACH64_WRITE(MACH64_GEN_TEST_CNTL, tmp & ~MACH64_GUI_ENGINE_ENABLE);
/* Enable the GUI engine
*/
tmp = MACH64_READ(MACH64_GEN_TEST_CNTL);
MACH64_WRITE(MACH64_GEN_TEST_CNTL, tmp | MACH64_GUI_ENGINE_ENABLE);
/* ensure engine is not locked up by clearing any FIFO or HOST errors
*/
tmp = MACH64_READ(MACH64_BUS_CNTL);
MACH64_WRITE(MACH64_BUS_CNTL, tmp | 0x00a00000);
/* Once GUI engine is restored, disable bus mastering */
MACH64_WRITE(MACH64_SRC_CNTL, 0);
/* Reset descriptor ring */
mach64_ring_reset(dev_priv);
return 0;
}
/*@}*/
/*******************************************************************/
/** \name Debugging output */
/*@{*/
/**
* Dump engine registers values.
*/
void mach64_dump_engine_info(drm_mach64_private_t *dev_priv)
{
DRM_INFO("\n");
if (!dev_priv->is_pci) {
DRM_INFO(" AGP_BASE = 0x%08x\n",
MACH64_READ(MACH64_AGP_BASE));
DRM_INFO(" AGP_CNTL = 0x%08x\n",
MACH64_READ(MACH64_AGP_CNTL));
}
DRM_INFO(" ALPHA_TST_CNTL = 0x%08x\n",
MACH64_READ(MACH64_ALPHA_TST_CNTL));
DRM_INFO("\n");
DRM_INFO(" BM_COMMAND = 0x%08x\n",
MACH64_READ(MACH64_BM_COMMAND));
DRM_INFO("BM_FRAME_BUF_OFFSET = 0x%08x\n",
MACH64_READ(MACH64_BM_FRAME_BUF_OFFSET));
DRM_INFO(" BM_GUI_TABLE = 0x%08x\n",
MACH64_READ(MACH64_BM_GUI_TABLE));
DRM_INFO(" BM_STATUS = 0x%08x\n",
MACH64_READ(MACH64_BM_STATUS));
DRM_INFO(" BM_SYSTEM_MEM_ADDR = 0x%08x\n",
MACH64_READ(MACH64_BM_SYSTEM_MEM_ADDR));
DRM_INFO(" BM_SYSTEM_TABLE = 0x%08x\n",
MACH64_READ(MACH64_BM_SYSTEM_TABLE));
DRM_INFO(" BUS_CNTL = 0x%08x\n",
MACH64_READ(MACH64_BUS_CNTL));
DRM_INFO("\n");
/* DRM_INFO( " CLOCK_CNTL = 0x%08x\n", MACH64_READ( MACH64_CLOCK_CNTL ) ); */
DRM_INFO(" CLR_CMP_CLR = 0x%08x\n",
MACH64_READ(MACH64_CLR_CMP_CLR));
DRM_INFO(" CLR_CMP_CNTL = 0x%08x\n",
MACH64_READ(MACH64_CLR_CMP_CNTL));
/* DRM_INFO( " CLR_CMP_MSK = 0x%08x\n", MACH64_READ( MACH64_CLR_CMP_MSK ) ); */
DRM_INFO(" CONFIG_CHIP_ID = 0x%08x\n",
MACH64_READ(MACH64_CONFIG_CHIP_ID));
DRM_INFO(" CONFIG_CNTL = 0x%08x\n",
MACH64_READ(MACH64_CONFIG_CNTL));
DRM_INFO(" CONFIG_STAT0 = 0x%08x\n",
MACH64_READ(MACH64_CONFIG_STAT0));
DRM_INFO(" CONFIG_STAT1 = 0x%08x\n",
MACH64_READ(MACH64_CONFIG_STAT1));
DRM_INFO(" CONFIG_STAT2 = 0x%08x\n",
MACH64_READ(MACH64_CONFIG_STAT2));
DRM_INFO(" CRC_SIG = 0x%08x\n", MACH64_READ(MACH64_CRC_SIG));
DRM_INFO(" CUSTOM_MACRO_CNTL = 0x%08x\n",
MACH64_READ(MACH64_CUSTOM_MACRO_CNTL));
DRM_INFO("\n");
/* DRM_INFO( " DAC_CNTL = 0x%08x\n", MACH64_READ( MACH64_DAC_CNTL ) ); */
/* DRM_INFO( " DAC_REGS = 0x%08x\n", MACH64_READ( MACH64_DAC_REGS ) ); */
DRM_INFO(" DP_BKGD_CLR = 0x%08x\n",
MACH64_READ(MACH64_DP_BKGD_CLR));
DRM_INFO(" DP_FRGD_CLR = 0x%08x\n",
MACH64_READ(MACH64_DP_FRGD_CLR));
DRM_INFO(" DP_MIX = 0x%08x\n", MACH64_READ(MACH64_DP_MIX));
DRM_INFO(" DP_PIX_WIDTH = 0x%08x\n",
MACH64_READ(MACH64_DP_PIX_WIDTH));
DRM_INFO(" DP_SRC = 0x%08x\n", MACH64_READ(MACH64_DP_SRC));
DRM_INFO(" DP_WRITE_MASK = 0x%08x\n",
MACH64_READ(MACH64_DP_WRITE_MASK));
DRM_INFO(" DSP_CONFIG = 0x%08x\n",
MACH64_READ(MACH64_DSP_CONFIG));
DRM_INFO(" DSP_ON_OFF = 0x%08x\n",
MACH64_READ(MACH64_DSP_ON_OFF));
DRM_INFO(" DST_CNTL = 0x%08x\n",
MACH64_READ(MACH64_DST_CNTL));
DRM_INFO(" DST_OFF_PITCH = 0x%08x\n",
MACH64_READ(MACH64_DST_OFF_PITCH));
DRM_INFO("\n");
/* DRM_INFO( " EXT_DAC_REGS = 0x%08x\n", MACH64_READ( MACH64_EXT_DAC_REGS ) ); */
DRM_INFO(" EXT_MEM_CNTL = 0x%08x\n",
MACH64_READ(MACH64_EXT_MEM_CNTL));
DRM_INFO("\n");
DRM_INFO(" FIFO_STAT = 0x%08x\n",
MACH64_READ(MACH64_FIFO_STAT));
DRM_INFO("\n");
DRM_INFO(" GEN_TEST_CNTL = 0x%08x\n",
MACH64_READ(MACH64_GEN_TEST_CNTL));
/* DRM_INFO( " GP_IO = 0x%08x\n", MACH64_READ( MACH64_GP_IO ) ); */
DRM_INFO(" GUI_CMDFIFO_DATA = 0x%08x\n",
MACH64_READ(MACH64_GUI_CMDFIFO_DATA));
DRM_INFO(" GUI_CMDFIFO_DEBUG = 0x%08x\n",
MACH64_READ(MACH64_GUI_CMDFIFO_DEBUG));
DRM_INFO(" GUI_CNTL = 0x%08x\n",
MACH64_READ(MACH64_GUI_CNTL));
DRM_INFO(" GUI_STAT = 0x%08x\n",
MACH64_READ(MACH64_GUI_STAT));
DRM_INFO(" GUI_TRAJ_CNTL = 0x%08x\n",
MACH64_READ(MACH64_GUI_TRAJ_CNTL));
DRM_INFO("\n");
DRM_INFO(" HOST_CNTL = 0x%08x\n",
MACH64_READ(MACH64_HOST_CNTL));
DRM_INFO(" HW_DEBUG = 0x%08x\n",
MACH64_READ(MACH64_HW_DEBUG));
DRM_INFO("\n");
DRM_INFO(" MEM_ADDR_CONFIG = 0x%08x\n",
MACH64_READ(MACH64_MEM_ADDR_CONFIG));
DRM_INFO(" MEM_BUF_CNTL = 0x%08x\n",
MACH64_READ(MACH64_MEM_BUF_CNTL));
DRM_INFO("\n");
DRM_INFO(" PAT_REG0 = 0x%08x\n",
MACH64_READ(MACH64_PAT_REG0));
DRM_INFO(" PAT_REG1 = 0x%08x\n",
MACH64_READ(MACH64_PAT_REG1));
DRM_INFO("\n");
DRM_INFO(" SC_LEFT = 0x%08x\n", MACH64_READ(MACH64_SC_LEFT));
DRM_INFO(" SC_RIGHT = 0x%08x\n",
MACH64_READ(MACH64_SC_RIGHT));
DRM_INFO(" SC_TOP = 0x%08x\n", MACH64_READ(MACH64_SC_TOP));
DRM_INFO(" SC_BOTTOM = 0x%08x\n",
MACH64_READ(MACH64_SC_BOTTOM));
DRM_INFO("\n");
DRM_INFO(" SCALE_3D_CNTL = 0x%08x\n",
MACH64_READ(MACH64_SCALE_3D_CNTL));
DRM_INFO(" SCRATCH_REG0 = 0x%08x\n",
MACH64_READ(MACH64_SCRATCH_REG0));
DRM_INFO(" SCRATCH_REG1 = 0x%08x\n",
MACH64_READ(MACH64_SCRATCH_REG1));
DRM_INFO(" SETUP_CNTL = 0x%08x\n",
MACH64_READ(MACH64_SETUP_CNTL));
DRM_INFO(" SRC_CNTL = 0x%08x\n",
MACH64_READ(MACH64_SRC_CNTL));
DRM_INFO("\n");
DRM_INFO(" TEX_CNTL = 0x%08x\n",
MACH64_READ(MACH64_TEX_CNTL));
DRM_INFO(" TEX_SIZE_PITCH = 0x%08x\n",
MACH64_READ(MACH64_TEX_SIZE_PITCH));
DRM_INFO(" TIMER_CONFIG = 0x%08x\n",
MACH64_READ(MACH64_TIMER_CONFIG));
DRM_INFO("\n");
DRM_INFO(" Z_CNTL = 0x%08x\n", MACH64_READ(MACH64_Z_CNTL));
DRM_INFO(" Z_OFF_PITCH = 0x%08x\n",
MACH64_READ(MACH64_Z_OFF_PITCH));
DRM_INFO("\n");
}
#define MACH64_DUMP_CONTEXT 3
/**
* Used by mach64_dump_ring_info() to dump the contents of the current buffer
* pointed by the ring head.
*/
static void mach64_dump_buf_info(drm_mach64_private_t *dev_priv,
struct drm_buf *buf)
{
u32 addr = GETBUFADDR(buf);
u32 used = buf->used >> 2;
u32 sys_addr = MACH64_READ(MACH64_BM_SYSTEM_MEM_ADDR);
u32 *p = GETBUFPTR(buf);
int skipped = 0;
DRM_INFO("buffer contents:\n");
while (used) {
u32 reg, count;
reg = le32_to_cpu(*p++);
if (addr <= GETBUFADDR(buf) + MACH64_DUMP_CONTEXT * 4 ||
(addr >= sys_addr - MACH64_DUMP_CONTEXT * 4 &&
addr <= sys_addr + MACH64_DUMP_CONTEXT * 4) ||
addr >=
GETBUFADDR(buf) + buf->used - MACH64_DUMP_CONTEXT * 4) {
DRM_INFO("%08x: 0x%08x\n", addr, reg);
}
addr += 4;
used--;
count = (reg >> 16) + 1;
reg = reg & 0xffff;
reg = MMSELECT(reg);
while (count && used) {
if (addr <= GETBUFADDR(buf) + MACH64_DUMP_CONTEXT * 4 ||
(addr >= sys_addr - MACH64_DUMP_CONTEXT * 4 &&
addr <= sys_addr + MACH64_DUMP_CONTEXT * 4) ||
addr >=
GETBUFADDR(buf) + buf->used -
MACH64_DUMP_CONTEXT * 4) {
DRM_INFO("%08x: 0x%04x = 0x%08x\n", addr,
reg, le32_to_cpu(*p));
skipped = 0;
} else {
if (!skipped) {
DRM_INFO(" ...\n");
skipped = 1;
}
}
p++;
addr += 4;
used--;
reg += 4;
count--;
}
}
DRM_INFO("\n");
}
/**
* Dump the ring state and contents, including the contents of the buffer being
* processed by the graphics engine.
*/
void mach64_dump_ring_info(drm_mach64_private_t *dev_priv)
{
drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
int i, skipped;
DRM_INFO("\n");
DRM_INFO("ring contents:\n");
DRM_INFO(" head_addr: 0x%08x head: %u tail: %u\n\n",
ring->head_addr, ring->head, ring->tail);
skipped = 0;
for (i = 0; i < ring->size / sizeof(u32); i += 4) {
if (i <= MACH64_DUMP_CONTEXT * 4 ||
i >= ring->size / sizeof(u32) - MACH64_DUMP_CONTEXT * 4 ||
(i >= ring->tail - MACH64_DUMP_CONTEXT * 4 &&
i <= ring->tail + MACH64_DUMP_CONTEXT * 4) ||
(i >= ring->head - MACH64_DUMP_CONTEXT * 4 &&
i <= ring->head + MACH64_DUMP_CONTEXT * 4)) {
DRM_INFO(" 0x%08x: 0x%08x 0x%08x 0x%08x 0x%08x%s%s\n",
(u32)(ring->start_addr + i * sizeof(u32)),
le32_to_cpu(((u32 *) ring->start)[i + 0]),
le32_to_cpu(((u32 *) ring->start)[i + 1]),
le32_to_cpu(((u32 *) ring->start)[i + 2]),
le32_to_cpu(((u32 *) ring->start)[i + 3]),
i == ring->head ? " (head)" : "",
i == ring->tail ? " (tail)" : "");
skipped = 0;
} else {
if (!skipped) {
DRM_INFO(" ...\n");
skipped = 1;
}
}
}
DRM_INFO("\n");
if (ring->head < ring->size / sizeof(u32)) {
struct list_head *ptr;
u32 addr = le32_to_cpu(((u32 *) ring->start)[ring->head + 1]);
list_for_each(ptr, &dev_priv->pending) {
drm_mach64_freelist_t *entry =
list_entry(ptr, drm_mach64_freelist_t, list);
struct drm_buf *buf = entry->buf;
u32 buf_addr = GETBUFADDR(buf);
if (buf_addr <= addr && addr < buf_addr + buf->used)
mach64_dump_buf_info(dev_priv, buf);
}
}
DRM_INFO("\n");
DRM_INFO(" BM_GUI_TABLE = 0x%08x\n",
MACH64_READ(MACH64_BM_GUI_TABLE));
DRM_INFO("\n");
DRM_INFO("BM_FRAME_BUF_OFFSET = 0x%08x\n",
MACH64_READ(MACH64_BM_FRAME_BUF_OFFSET));
DRM_INFO(" BM_SYSTEM_MEM_ADDR = 0x%08x\n",
MACH64_READ(MACH64_BM_SYSTEM_MEM_ADDR));
DRM_INFO(" BM_COMMAND = 0x%08x\n",
MACH64_READ(MACH64_BM_COMMAND));
DRM_INFO("\n");
DRM_INFO(" BM_STATUS = 0x%08x\n",
MACH64_READ(MACH64_BM_STATUS));
DRM_INFO(" BUS_CNTL = 0x%08x\n",
MACH64_READ(MACH64_BUS_CNTL));
DRM_INFO(" FIFO_STAT = 0x%08x\n",
MACH64_READ(MACH64_FIFO_STAT));
DRM_INFO(" GUI_STAT = 0x%08x\n",
MACH64_READ(MACH64_GUI_STAT));
DRM_INFO(" SRC_CNTL = 0x%08x\n",
MACH64_READ(MACH64_SRC_CNTL));
}
/*@}*/
/*******************************************************************/
/** \name DMA descriptor ring macros */
/*@{*/
/**
* Add the end mark to the ring's new tail position.
*
* The bus master engine will keep processing the DMA buffers listed in the ring
* until it finds this mark, making it stop.
*
* \sa mach64_clear_dma_eol
*/
static __inline__ void mach64_set_dma_eol(volatile u32 *addr)
{
#if defined(__i386__)
int nr = 31;
/* Taken from include/asm-i386/bitops.h linux header */
__asm__ __volatile__("lock;" "btsl %1,%0":"=m"(*addr)
:"Ir"(nr));
#elif defined(__powerpc__)
u32 old;
u32 mask = cpu_to_le32(MACH64_DMA_EOL);
/* Taken from the include/asm-ppc/bitops.h linux header */
__asm__ __volatile__("\n\
1: lwarx %0,0,%3 \n\
or %0,%0,%2 \n\
stwcx. %0,0,%3 \n\
bne- 1b":"=&r"(old), "=m"(*addr)
:"r"(mask), "r"(addr), "m"(*addr)
:"cc");
#elif defined(__alpha__)
u32 temp;
u32 mask = MACH64_DMA_EOL;
/* Taken from the include/asm-alpha/bitops.h linux header */
__asm__ __volatile__("1: ldl_l %0,%3\n"
" bis %0,%2,%0\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous":"=&r"(temp), "=m"(*addr)
:"Ir"(mask), "m"(*addr));
#else
u32 mask = cpu_to_le32(MACH64_DMA_EOL);
*addr |= mask;
#endif
}
/**
* Remove the end mark from the ring's old tail position.
*
* It should be called after calling mach64_set_dma_eol to mark the ring's new
* tail position.
*
* We update the end marks while the bus master engine is in operation. Since
* the bus master engine may potentially be reading from the same position
* that we write, we must change atomically to avoid having intermediary bad
* data.
*/
static __inline__ void mach64_clear_dma_eol(volatile u32 *addr)
{
#if defined(__i386__)
int nr = 31;
/* Taken from include/asm-i386/bitops.h linux header */
__asm__ __volatile__("lock;" "btrl %1,%0":"=m"(*addr)
:"Ir"(nr));
#elif defined(__powerpc__)
u32 old;
u32 mask = cpu_to_le32(MACH64_DMA_EOL);
/* Taken from the include/asm-ppc/bitops.h linux header */
__asm__ __volatile__("\n\
1: lwarx %0,0,%3 \n\
andc %0,%0,%2 \n\
stwcx. %0,0,%3 \n\
bne- 1b":"=&r"(old), "=m"(*addr)
:"r"(mask), "r"(addr), "m"(*addr)
:"cc");
#elif defined(__alpha__)
u32 temp;
u32 mask = ~MACH64_DMA_EOL;
/* Taken from the include/asm-alpha/bitops.h linux header */
__asm__ __volatile__("1: ldl_l %0,%3\n"
" and %0,%2,%0\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous":"=&r"(temp), "=m"(*addr)
:"Ir"(mask), "m"(*addr));
#else
u32 mask = cpu_to_le32(~MACH64_DMA_EOL);
*addr &= mask;
#endif
}
#define RING_LOCALS \
int _ring_tail, _ring_write; unsigned int _ring_mask; volatile u32 *_ring
#define RING_WRITE_OFS _ring_write
#define BEGIN_RING(n) \
do { \
if (MACH64_VERBOSE) { \
DRM_INFO( "BEGIN_RING( %d ) \n", \
(n) ); \
} \
if (dev_priv->ring.space <= (n) * sizeof(u32)) { \
int ret; \
if ((ret = mach64_wait_ring( dev_priv, (n) * sizeof(u32))) < 0 ) { \
DRM_ERROR( "wait_ring failed, resetting engine\n"); \
mach64_dump_engine_info( dev_priv ); \
mach64_do_engine_reset( dev_priv ); \
return ret; \
} \
} \
dev_priv->ring.space -= (n) * sizeof(u32); \
_ring = (u32 *) dev_priv->ring.start; \
_ring_tail = _ring_write = dev_priv->ring.tail; \
_ring_mask = dev_priv->ring.tail_mask; \
} while (0)
#define OUT_RING( x ) \
do { \
if (MACH64_VERBOSE) { \
DRM_INFO( " OUT_RING( 0x%08x ) at 0x%x\n", \
(unsigned int)(x), _ring_write ); \
} \
_ring[_ring_write++] = cpu_to_le32( x ); \
_ring_write &= _ring_mask; \
} while (0)
#define ADVANCE_RING() \
do { \
if (MACH64_VERBOSE) { \
DRM_INFO( "ADVANCE_RING() wr=0x%06x tail=0x%06x\n", \
_ring_write, _ring_tail ); \
} \
DRM_MEMORYBARRIER(); \
mach64_clear_dma_eol( &_ring[(_ring_tail - 2) & _ring_mask] ); \
DRM_MEMORYBARRIER(); \
dev_priv->ring.tail = _ring_write; \
mach64_ring_tick( dev_priv, &(dev_priv)->ring ); \
} while (0)
/**
* Queue a DMA buffer of registers writes into the ring buffer.
*/
int mach64_add_buf_to_ring(drm_mach64_private_t *dev_priv,
drm_mach64_freelist_t *entry)
{
int bytes, pages, remainder;
u32 address, page;
int i;
struct drm_buf *buf = entry->buf;
RING_LOCALS;
bytes = buf->used;
address = GETBUFADDR( buf );
pages = (bytes + MACH64_DMA_CHUNKSIZE - 1) / MACH64_DMA_CHUNKSIZE;
BEGIN_RING( pages * 4 );
for ( i = 0 ; i < pages-1 ; i++ ) {
page = address + i * MACH64_DMA_CHUNKSIZE;
OUT_RING( MACH64_APERTURE_OFFSET + MACH64_BM_ADDR );
OUT_RING( page );
OUT_RING( MACH64_DMA_CHUNKSIZE | MACH64_DMA_HOLD_OFFSET );
OUT_RING( 0 );
}
/* generate the final descriptor for any remaining commands in this buffer */
page = address + i * MACH64_DMA_CHUNKSIZE;
remainder = bytes - i * MACH64_DMA_CHUNKSIZE;
/* Save dword offset of last descriptor for this buffer.
* This is needed to check for completion of the buffer in freelist_get
*/
entry->ring_ofs = RING_WRITE_OFS;
OUT_RING( MACH64_APERTURE_OFFSET + MACH64_BM_ADDR );
OUT_RING( page );
OUT_RING( remainder | MACH64_DMA_HOLD_OFFSET | MACH64_DMA_EOL );
OUT_RING( 0 );
ADVANCE_RING();
return 0;
}
/**
* Queue DMA buffer controlling host data tranfers (e.g., blit).
*
* Almost identical to mach64_add_buf_to_ring.
*/
int mach64_add_hostdata_buf_to_ring(drm_mach64_private_t *dev_priv,
drm_mach64_freelist_t *entry)
{
int bytes, pages, remainder;
u32 address, page;
int i;
struct drm_buf *buf = entry->buf;
RING_LOCALS;
bytes = buf->used - MACH64_HOSTDATA_BLIT_OFFSET;
pages = (bytes + MACH64_DMA_CHUNKSIZE - 1) / MACH64_DMA_CHUNKSIZE;
address = GETBUFADDR( buf );
BEGIN_RING( 4 + pages * 4 );
OUT_RING( MACH64_APERTURE_OFFSET + MACH64_BM_ADDR );
OUT_RING( address );
OUT_RING( MACH64_HOSTDATA_BLIT_OFFSET | MACH64_DMA_HOLD_OFFSET );
OUT_RING( 0 );
address += MACH64_HOSTDATA_BLIT_OFFSET;
for ( i = 0 ; i < pages-1 ; i++ ) {
page = address + i * MACH64_DMA_CHUNKSIZE;
OUT_RING( MACH64_APERTURE_OFFSET + MACH64_BM_HOSTDATA );
OUT_RING( page );
OUT_RING( MACH64_DMA_CHUNKSIZE | MACH64_DMA_HOLD_OFFSET );
OUT_RING( 0 );
}
/* generate the final descriptor for any remaining commands in this buffer */
page = address + i * MACH64_DMA_CHUNKSIZE;
remainder = bytes - i * MACH64_DMA_CHUNKSIZE;
/* Save dword offset of last descriptor for this buffer.
* This is needed to check for completion of the buffer in freelist_get
*/
entry->ring_ofs = RING_WRITE_OFS;
OUT_RING( MACH64_APERTURE_OFFSET + MACH64_BM_HOSTDATA );
OUT_RING( page );
OUT_RING( remainder | MACH64_DMA_HOLD_OFFSET | MACH64_DMA_EOL );
OUT_RING( 0 );
ADVANCE_RING();
return 0;
}
/*@}*/
/*******************************************************************/
/** \name DMA test and initialization */
/*@{*/
/**
* Perform a simple DMA operation using the pattern registers to test whether
* DMA works.
*
* \return zero if successful.
*
* \note This function was the testbed for many experiences regarding Mach64
* DMA operation. It is left here since it so tricky to get DMA operating
* properly in some architectures and hardware.
*/
static int mach64_bm_dma_test(struct drm_device * dev)
{
drm_mach64_private_t *dev_priv = dev->dev_private;
drm_dma_handle_t *cpu_addr_dmah;
u32 data_addr;
u32 *table, *data;
u32 expected[2];
u32 src_cntl, pat_reg0, pat_reg1;
int i, count, failed;
DRM_DEBUG("\n");
table = (u32 *) dev_priv->ring.start;
/* FIXME: get a dma buffer from the freelist here */
DRM_DEBUG("Allocating data memory ...\n");
#ifdef __FreeBSD__
DRM_UNLOCK();
#endif
cpu_addr_dmah =
drm_pci_alloc(dev, 0x1000, 0x1000, 0xfffffffful);
#ifdef __FreeBSD__
DRM_LOCK();
#endif
if (!cpu_addr_dmah) {
DRM_INFO("data-memory allocation failed!\n");
return -ENOMEM;
} else {
data = (u32 *) cpu_addr_dmah->vaddr;
data_addr = (u32) cpu_addr_dmah->busaddr;
}
/* Save the X server's value for SRC_CNTL and restore it
* in case our test fails. This prevents the X server
* from disabling it's cache for this register
*/
src_cntl = MACH64_READ(MACH64_SRC_CNTL);
pat_reg0 = MACH64_READ(MACH64_PAT_REG0);
pat_reg1 = MACH64_READ(MACH64_PAT_REG1);
mach64_do_wait_for_fifo(dev_priv, 3);
MACH64_WRITE(MACH64_SRC_CNTL, 0);
MACH64_WRITE(MACH64_PAT_REG0, 0x11111111);
MACH64_WRITE(MACH64_PAT_REG1, 0x11111111);
mach64_do_wait_for_idle(dev_priv);
for (i = 0; i < 2; i++) {
u32 reg;
reg = MACH64_READ((MACH64_PAT_REG0 + i * 4));
DRM_DEBUG("(Before DMA Transfer) reg %d = 0x%08x\n", i, reg);
if (reg != 0x11111111) {
DRM_INFO("Error initializing test registers\n");
DRM_INFO("resetting engine ...\n");
mach64_do_engine_reset(dev_priv);
DRM_INFO("freeing data buffer memory.\n");
drm_pci_free(dev, cpu_addr_dmah);
return -EIO;
}
}
/* fill up a buffer with sets of 2 consecutive writes starting with PAT_REG0 */
count = 0;
data[count++] = cpu_to_le32(DMAREG(MACH64_PAT_REG0) | (1 << 16));
data[count++] = expected[0] = 0x22222222;
data[count++] = expected[1] = 0xaaaaaaaa;
while (count < 1020) {
data[count++] =
cpu_to_le32(DMAREG(MACH64_PAT_REG0) | (1 << 16));
data[count++] = 0x22222222;
data[count++] = 0xaaaaaaaa;
}
data[count++] = cpu_to_le32(DMAREG(MACH64_SRC_CNTL) | (0 << 16));
data[count++] = 0;
DRM_DEBUG("Preparing table ...\n");
table[MACH64_DMA_FRAME_BUF_OFFSET] = cpu_to_le32(MACH64_BM_ADDR +
MACH64_APERTURE_OFFSET);
table[MACH64_DMA_SYS_MEM_ADDR] = cpu_to_le32(data_addr);
table[MACH64_DMA_COMMAND] = cpu_to_le32(count * sizeof(u32)
| MACH64_DMA_HOLD_OFFSET
| MACH64_DMA_EOL);
table[MACH64_DMA_RESERVED] = 0;
DRM_DEBUG("table[0] = 0x%08x\n", table[0]);
DRM_DEBUG("table[1] = 0x%08x\n", table[1]);
DRM_DEBUG("table[2] = 0x%08x\n", table[2]);
DRM_DEBUG("table[3] = 0x%08x\n", table[3]);
for (i = 0; i < 6; i++) {
DRM_DEBUG(" data[%d] = 0x%08x\n", i, data[i]);
}
DRM_DEBUG(" ...\n");
for (i = count - 5; i < count; i++) {
DRM_DEBUG(" data[%d] = 0x%08x\n", i, data[i]);
}
DRM_MEMORYBARRIER();
DRM_DEBUG("waiting for idle...\n");
if ((i = mach64_do_wait_for_idle(dev_priv))) {
DRM_INFO("mach64_do_wait_for_idle failed (result=%d)\n", i);
DRM_INFO("resetting engine ...\n");
mach64_do_engine_reset(dev_priv);
mach64_do_wait_for_fifo(dev_priv, 3);
MACH64_WRITE(MACH64_SRC_CNTL, src_cntl);
MACH64_WRITE(MACH64_PAT_REG0, pat_reg0);
MACH64_WRITE(MACH64_PAT_REG1, pat_reg1);
DRM_INFO("freeing data buffer memory.\n");
drm_pci_free(dev, cpu_addr_dmah);
return i;
}
DRM_DEBUG("waiting for idle...done\n");
DRM_DEBUG("BUS_CNTL = 0x%08x\n", MACH64_READ(MACH64_BUS_CNTL));
DRM_DEBUG("SRC_CNTL = 0x%08x\n", MACH64_READ(MACH64_SRC_CNTL));
DRM_DEBUG("\n");
DRM_DEBUG("data bus addr = 0x%08x\n", data_addr);
DRM_DEBUG("table bus addr = 0x%08x\n", dev_priv->ring.start_addr);
DRM_DEBUG("starting DMA transfer...\n");
MACH64_WRITE(MACH64_BM_GUI_TABLE_CMD,
dev_priv->ring.start_addr | MACH64_CIRCULAR_BUF_SIZE_16KB);
MACH64_WRITE(MACH64_SRC_CNTL,
MACH64_SRC_BM_ENABLE | MACH64_SRC_BM_SYNC |
MACH64_SRC_BM_OP_SYSTEM_TO_REG);
/* Kick off the transfer */
DRM_DEBUG("starting DMA transfer... done.\n");
MACH64_WRITE(MACH64_DST_HEIGHT_WIDTH, 0);
DRM_DEBUG("waiting for idle...\n");
if ((i = mach64_do_wait_for_idle(dev_priv))) {
/* engine locked up, dump register state and reset */
DRM_INFO("mach64_do_wait_for_idle failed (result=%d)\n", i);
mach64_dump_engine_info(dev_priv);
DRM_INFO("resetting engine ...\n");
mach64_do_engine_reset(dev_priv);
mach64_do_wait_for_fifo(dev_priv, 3);
MACH64_WRITE(MACH64_SRC_CNTL, src_cntl);
MACH64_WRITE(MACH64_PAT_REG0, pat_reg0);
MACH64_WRITE(MACH64_PAT_REG1, pat_reg1);
DRM_INFO("freeing data buffer memory.\n");
drm_pci_free(dev, cpu_addr_dmah);
return i;
}
DRM_DEBUG("waiting for idle...done\n");
/* restore SRC_CNTL */
mach64_do_wait_for_fifo(dev_priv, 1);
MACH64_WRITE(MACH64_SRC_CNTL, src_cntl);
failed = 0;
/* Check register values to see if the GUI master operation succeeded */
for (i = 0; i < 2; i++) {
u32 reg;
reg = MACH64_READ((MACH64_PAT_REG0 + i * 4));
DRM_DEBUG("(After DMA Transfer) reg %d = 0x%08x\n", i, reg);
if (reg != expected[i]) {
failed = -1;
}
}
/* restore pattern registers */
mach64_do_wait_for_fifo(dev_priv, 2);
MACH64_WRITE(MACH64_PAT_REG0, pat_reg0);
MACH64_WRITE(MACH64_PAT_REG1, pat_reg1);
DRM_DEBUG("freeing data buffer memory.\n");
drm_pci_free(dev, cpu_addr_dmah);
DRM_DEBUG("returning ...\n");
return failed;
}
/**
* Called during the DMA initialization ioctl to initialize all the necessary
* software and hardware state for DMA operation.
*/
static int mach64_do_dma_init(struct drm_device * dev, drm_mach64_init_t * init)
{
drm_mach64_private_t *dev_priv;
u32 tmp;
int i, ret;
DRM_DEBUG("\n");
dev_priv = drm_alloc(sizeof(drm_mach64_private_t), DRM_MEM_DRIVER);
if (dev_priv == NULL)
return -ENOMEM;
memset(dev_priv, 0, sizeof(drm_mach64_private_t));
dev_priv->is_pci = init->is_pci;
dev_priv->fb_bpp = init->fb_bpp;
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_bpp = init->depth_bpp;
dev_priv->depth_offset = init->depth_offset;
dev_priv->depth_pitch = init->depth_pitch;
dev_priv->front_offset_pitch = (((dev_priv->front_pitch / 8) << 22) |
(dev_priv->front_offset >> 3));
dev_priv->back_offset_pitch = (((dev_priv->back_pitch / 8) << 22) |
(dev_priv->back_offset >> 3));
dev_priv->depth_offset_pitch = (((dev_priv->depth_pitch / 8) << 22) |
(dev_priv->depth_offset >> 3));
dev_priv->usec_timeout = 1000000;
/* Set up the freelist, placeholder list and pending list */
INIT_LIST_HEAD(&dev_priv->free_list);
INIT_LIST_HEAD(&dev_priv->placeholders);
INIT_LIST_HEAD(&dev_priv->pending);
dev_priv->sarea = drm_getsarea(dev);
if (!dev_priv->sarea) {
DRM_ERROR("can not find sarea!\n");
dev->dev_private = (void *)dev_priv;
mach64_do_cleanup_dma(dev);
return -EINVAL;
}
dev_priv->fb = drm_core_findmap(dev, init->fb_offset);
if (!dev_priv->fb) {
DRM_ERROR("can not find frame buffer map!\n");
dev->dev_private = (void *)dev_priv;
mach64_do_cleanup_dma(dev);
return -EINVAL;
}
dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
if (!dev_priv->mmio) {
DRM_ERROR("can not find mmio map!\n");
dev->dev_private = (void *)dev_priv;
mach64_do_cleanup_dma(dev);
return -EINVAL;
}
dev_priv->ring_map = drm_core_findmap(dev, init->ring_offset);
if (!dev_priv->ring_map) {
DRM_ERROR("can not find ring map!\n");
dev->dev_private = (void *)dev_priv;
mach64_do_cleanup_dma(dev);
return -EINVAL;
}
dev_priv->sarea_priv = (drm_mach64_sarea_t *)
((u8 *) dev_priv->sarea->virtual + init->sarea_priv_offset);
if (!dev_priv->is_pci) {
drm_core_ioremap(dev_priv->ring_map, dev);
if (!dev_priv->ring_map->virtual) {
DRM_ERROR("can not ioremap virtual address for"
" descriptor ring\n");
dev->dev_private = (void *)dev_priv;
mach64_do_cleanup_dma(dev);
return -ENOMEM;
}
dev->agp_buffer_token = init->buffers_offset;
dev->agp_buffer_map =
drm_core_findmap(dev, init->buffers_offset);
if (!dev->agp_buffer_map) {
DRM_ERROR("can not find dma buffer map!\n");
dev->dev_private = (void *)dev_priv;
mach64_do_cleanup_dma(dev);
return -EINVAL;
}
/* there might be a nicer way to do this -
dev isn't passed all the way though the mach64 - DA */
dev_priv->dev_buffers = dev->agp_buffer_map;
drm_core_ioremap(dev->agp_buffer_map, dev);
if (!dev->agp_buffer_map->virtual) {
DRM_ERROR("can not ioremap virtual address for"
" dma buffer\n");
dev->dev_private = (void *)dev_priv;
mach64_do_cleanup_dma(dev);
return -ENOMEM;
}
dev_priv->agp_textures =
drm_core_findmap(dev, init->agp_textures_offset);
if (!dev_priv->agp_textures) {
DRM_ERROR("can not find agp texture region!\n");
dev->dev_private = (void *)dev_priv;
mach64_do_cleanup_dma(dev);
return -EINVAL;
}
}
dev->dev_private = (void *)dev_priv;
dev_priv->driver_mode = init->dma_mode;
/* changing the FIFO size from the default causes problems with DMA */
tmp = MACH64_READ(MACH64_GUI_CNTL);
if ((tmp & MACH64_CMDFIFO_SIZE_MASK) != MACH64_CMDFIFO_SIZE_128) {
DRM_INFO("Setting FIFO size to 128 entries\n");
/* FIFO must be empty to change the FIFO depth */
if ((ret = mach64_do_wait_for_idle(dev_priv))) {
DRM_ERROR
("wait for idle failed before changing FIFO depth!\n");
mach64_do_cleanup_dma(dev);
return ret;
}
MACH64_WRITE(MACH64_GUI_CNTL, ((tmp & ~MACH64_CMDFIFO_SIZE_MASK)
| MACH64_CMDFIFO_SIZE_128));
/* need to read GUI_STAT for proper sync according to docs */
if ((ret = mach64_do_wait_for_idle(dev_priv))) {
DRM_ERROR
("wait for idle failed when changing FIFO depth!\n");
mach64_do_cleanup_dma(dev);
return ret;
}
}
dev_priv->ring.size = 0x4000; /* 16KB */
dev_priv->ring.start = dev_priv->ring_map->virtual;
dev_priv->ring.start_addr = (u32) dev_priv->ring_map->offset;
memset(dev_priv->ring.start, 0, dev_priv->ring.size);
DRM_INFO("descriptor ring: cpu addr %p, bus addr: 0x%08x\n",
dev_priv->ring.start, dev_priv->ring.start_addr);
ret = 0;
if (dev_priv->driver_mode != MACH64_MODE_MMIO) {
/* enable block 1 registers and bus mastering */
MACH64_WRITE(MACH64_BUS_CNTL, ((MACH64_READ(MACH64_BUS_CNTL)
| MACH64_BUS_EXT_REG_EN)
& ~MACH64_BUS_MASTER_DIS));
/* try a DMA GUI-mastering pass and fall back to MMIO if it fails */
DRM_DEBUG("Starting DMA test...\n");
if ((ret = mach64_bm_dma_test(dev))) {
dev_priv->driver_mode = MACH64_MODE_MMIO;
}
}
switch (dev_priv->driver_mode) {
case MACH64_MODE_MMIO:
MACH64_WRITE(MACH64_BUS_CNTL, (MACH64_READ(MACH64_BUS_CNTL)
| MACH64_BUS_EXT_REG_EN
| MACH64_BUS_MASTER_DIS));
if (init->dma_mode == MACH64_MODE_MMIO)
DRM_INFO("Forcing pseudo-DMA mode\n");
else
DRM_INFO
("DMA test failed (ret=%d), using pseudo-DMA mode\n",
ret);
break;
case MACH64_MODE_DMA_SYNC:
DRM_INFO("DMA test succeeded, using synchronous DMA mode\n");
break;
case MACH64_MODE_DMA_ASYNC:
default:
DRM_INFO("DMA test succeeded, using asynchronous DMA mode\n");
}
dev_priv->ring_running = 0;
/* setup offsets for physical address of table start and end */
dev_priv->ring.head_addr = dev_priv->ring.start_addr;
dev_priv->ring.head = dev_priv->ring.tail = 0;
dev_priv->ring.tail_mask = (dev_priv->ring.size / sizeof(u32)) - 1;
dev_priv->ring.space = dev_priv->ring.size;
/* setup physical address and size of descriptor table */
mach64_do_wait_for_fifo(dev_priv, 1);
MACH64_WRITE(MACH64_BM_GUI_TABLE_CMD,
(dev_priv->ring.
head_addr | MACH64_CIRCULAR_BUF_SIZE_16KB));
/* init frame counter */
dev_priv->sarea_priv->frames_queued = 0;
for (i = 0; i < MACH64_MAX_QUEUED_FRAMES; i++) {
dev_priv->frame_ofs[i] = ~0; /* All ones indicates placeholder */
}
/* Allocate the DMA buffer freelist */
if ((ret = mach64_init_freelist(dev))) {
DRM_ERROR("Freelist allocation failed\n");
mach64_do_cleanup_dma(dev);
return ret;
}
return 0;
}
/*******************************************************************/
/** MMIO Pseudo-DMA (intended primarily for debugging, not performance)
*/
int mach64_do_dispatch_pseudo_dma(drm_mach64_private_t *dev_priv)
{
drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
volatile u32 *ring_read;
struct list_head *ptr;
drm_mach64_freelist_t *entry;
struct drm_buf *buf = NULL;
u32 *buf_ptr;
u32 used, reg, target;
int fifo, count, found, ret, no_idle_wait;
fifo = count = reg = no_idle_wait = 0;
target = MACH64_BM_ADDR;
if ((ret = mach64_do_wait_for_idle(dev_priv)) < 0) {
DRM_INFO("idle failed before pseudo-dma dispatch, resetting engine\n");
mach64_dump_engine_info(dev_priv);
mach64_do_engine_reset(dev_priv);
return ret;
}
ring_read = (u32 *) ring->start;
while (ring->tail != ring->head) {
u32 buf_addr, new_target, offset;
u32 bytes, remaining, head, eol;
head = ring->head;
new_target =
le32_to_cpu(ring_read[head++]) - MACH64_APERTURE_OFFSET;
buf_addr = le32_to_cpu(ring_read[head++]);
eol = le32_to_cpu(ring_read[head]) & MACH64_DMA_EOL;
bytes = le32_to_cpu(ring_read[head++])
& ~(MACH64_DMA_HOLD_OFFSET | MACH64_DMA_EOL);
head++;
head &= ring->tail_mask;
/* can't wait for idle between a blit setup descriptor
* and a HOSTDATA descriptor or the engine will lock
*/
if (new_target == MACH64_BM_HOSTDATA
&& target == MACH64_BM_ADDR)
no_idle_wait = 1;
target = new_target;
found = 0;
offset = 0;
list_for_each(ptr, &dev_priv->pending) {
entry = list_entry(ptr, drm_mach64_freelist_t, list);
buf = entry->buf;
offset = buf_addr - GETBUFADDR(buf);
if (offset < MACH64_BUFFER_SIZE) {
found = 1;
break;
}
}
if (!found || buf == NULL) {
DRM_ERROR
("Couldn't find pending buffer: head: %u tail: %u buf_addr: 0x%08x %s\n",
head, ring->tail, buf_addr, (eol ? "eol" : ""));
mach64_dump_ring_info(dev_priv);
mach64_do_engine_reset(dev_priv);
return -EINVAL;
}
/* Hand feed the buffer to the card via MMIO, waiting for the fifo
* every 16 writes
*/
DRM_DEBUG("target: (0x%08x) %s\n", target,
(target ==
MACH64_BM_HOSTDATA ? "BM_HOSTDATA" : "BM_ADDR"));
DRM_DEBUG("offset: %u bytes: %u used: %u\n", offset, bytes,
buf->used);
remaining = (buf->used - offset) >> 2; /* dwords remaining in buffer */
used = bytes >> 2; /* dwords in buffer for this descriptor */
buf_ptr = (u32 *) ((char *)GETBUFPTR(buf) + offset);
while (used) {
if (count == 0) {
if (target == MACH64_BM_HOSTDATA) {
reg = DMAREG(MACH64_HOST_DATA0);
count =
(remaining > 16) ? 16 : remaining;
fifo = 0;
} else {
reg = le32_to_cpu(*buf_ptr++);
used--;
count = (reg >> 16) + 1;
}
reg = reg & 0xffff;
reg = MMSELECT(reg);
}
while (count && used) {
if (!fifo) {
if (no_idle_wait) {
if ((ret =
mach64_do_wait_for_fifo
(dev_priv, 16)) < 0) {
no_idle_wait = 0;
return ret;
}
} else {
if ((ret =
mach64_do_wait_for_idle
(dev_priv)) < 0) {
return ret;
}
}
fifo = 16;
}
--fifo;
MACH64_WRITE(reg, le32_to_cpu(*buf_ptr++));
used--;
remaining--;
reg += 4;
count--;
}
}
ring->head = head;
ring->head_addr = ring->start_addr + (ring->head * sizeof(u32));
ring->space += (4 * sizeof(u32));
}
if ((ret = mach64_do_wait_for_idle(dev_priv)) < 0) {
return ret;
}
MACH64_WRITE(MACH64_BM_GUI_TABLE_CMD,
ring->head_addr | MACH64_CIRCULAR_BUF_SIZE_16KB);
DRM_DEBUG("completed\n");
return 0;
}
/*@}*/
/*******************************************************************/
/** \name DMA cleanup */
/*@{*/
int mach64_do_cleanup_dma(struct drm_device * dev)
{
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)
drm_irq_uninstall(dev);
if (dev->dev_private) {
drm_mach64_private_t *dev_priv = dev->dev_private;
if (!dev_priv->is_pci) {
if (dev_priv->ring_map)
drm_core_ioremapfree(dev_priv->ring_map, dev);
if (dev->agp_buffer_map) {
drm_core_ioremapfree(dev->agp_buffer_map, dev);
dev->agp_buffer_map = NULL;
}
}
mach64_destroy_freelist(dev);
drm_free(dev_priv, sizeof(drm_mach64_private_t),
DRM_MEM_DRIVER);
dev->dev_private = NULL;
}
return 0;
}
/*@}*/
/*******************************************************************/
/** \name IOCTL handlers */
/*@{*/
int mach64_dma_init(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_mach64_init_t *init = data;
DRM_DEBUG("\n");
LOCK_TEST_WITH_RETURN(dev, file_priv);
switch (init->func) {
case DRM_MACH64_INIT_DMA:
return mach64_do_dma_init(dev, init);
case DRM_MACH64_CLEANUP_DMA:
return mach64_do_cleanup_dma(dev);
}
return -EINVAL;
}
int mach64_dma_idle(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_mach64_private_t *dev_priv = dev->dev_private;
DRM_DEBUG("\n");
LOCK_TEST_WITH_RETURN(dev, file_priv);
return mach64_do_dma_idle(dev_priv);
}
int mach64_dma_flush(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_mach64_private_t *dev_priv = dev->dev_private;
DRM_DEBUG("\n");
LOCK_TEST_WITH_RETURN(dev, file_priv);
return mach64_do_dma_flush(dev_priv);
}
int mach64_engine_reset(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_mach64_private_t *dev_priv = dev->dev_private;
DRM_DEBUG("\n");
LOCK_TEST_WITH_RETURN(dev, file_priv);
return mach64_do_engine_reset(dev_priv);
}
/*@}*/
/*******************************************************************/
/** \name Freelist management */
/*@{*/
int mach64_init_freelist(struct drm_device * dev)
{
struct drm_device_dma *dma = dev->dma;
drm_mach64_private_t *dev_priv = dev->dev_private;
drm_mach64_freelist_t *entry;
struct list_head *ptr;
int i;
DRM_DEBUG("adding %d buffers to freelist\n", dma->buf_count);
for (i = 0; i < dma->buf_count; i++) {
if ((entry =
(drm_mach64_freelist_t *)
drm_alloc(sizeof(drm_mach64_freelist_t),
DRM_MEM_BUFLISTS)) == NULL)
return -ENOMEM;
memset(entry, 0, sizeof(drm_mach64_freelist_t));
entry->buf = dma->buflist[i];
ptr = &entry->list;
list_add_tail(ptr, &dev_priv->free_list);
}
return 0;
}
void mach64_destroy_freelist(struct drm_device * dev)
{
drm_mach64_private_t *dev_priv = dev->dev_private;
drm_mach64_freelist_t *entry;
struct list_head *ptr;
struct list_head *tmp;
DRM_DEBUG("\n");
list_for_each_safe(ptr, tmp, &dev_priv->pending) {
list_del(ptr);
entry = list_entry(ptr, drm_mach64_freelist_t, list);
drm_free(entry, sizeof(*entry), DRM_MEM_BUFLISTS);
}
list_for_each_safe(ptr, tmp, &dev_priv->placeholders) {
list_del(ptr);
entry = list_entry(ptr, drm_mach64_freelist_t, list);
drm_free(entry, sizeof(*entry), DRM_MEM_BUFLISTS);
}
list_for_each_safe(ptr, tmp, &dev_priv->free_list) {
list_del(ptr);
entry = list_entry(ptr, drm_mach64_freelist_t, list);
drm_free(entry, sizeof(*entry), DRM_MEM_BUFLISTS);
}
}
/* IMPORTANT: This function should only be called when the engine is idle or locked up,
* as it assumes all buffers in the pending list have been completed by the hardware.
*/
int mach64_do_release_used_buffers(drm_mach64_private_t *dev_priv)
{
struct list_head *ptr;
struct list_head *tmp;
drm_mach64_freelist_t *entry;
int i;
if (list_empty(&dev_priv->pending))
return 0;
/* Iterate the pending list and move all buffers into the freelist... */
i = 0;
list_for_each_safe(ptr, tmp, &dev_priv->pending) {
entry = list_entry(ptr, drm_mach64_freelist_t, list);
if (entry->discard) {
entry->buf->pending = 0;
list_del(ptr);
list_add_tail(ptr, &dev_priv->free_list);
i++;
}
}
DRM_DEBUG("released %d buffers from pending list\n", i);
return 0;
}
static int mach64_do_reclaim_completed(drm_mach64_private_t *dev_priv)
{
drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
struct list_head *ptr;
struct list_head *tmp;
drm_mach64_freelist_t *entry;
u32 head, tail, ofs;
mach64_ring_tick(dev_priv, ring);
head = ring->head;
tail = ring->tail;
if (head == tail) {
#if MACH64_EXTRA_CHECKING
if (MACH64_READ(MACH64_GUI_STAT) & MACH64_GUI_ACTIVE) {
DRM_ERROR("Empty ring with non-idle engine!\n");
mach64_dump_ring_info(dev_priv);
return -1;
}
#endif
/* last pass is complete, so release everything */
mach64_do_release_used_buffers(dev_priv);
DRM_DEBUG("idle engine, freed all buffers.\n");
if (list_empty(&dev_priv->free_list)) {
DRM_ERROR("Freelist empty with idle engine\n");
return -1;
}
return 0;
}
/* Look for a completed buffer and bail out of the loop
* as soon as we find one -- don't waste time trying
* to free extra bufs here, leave that to do_release_used_buffers
*/
list_for_each_safe(ptr, tmp, &dev_priv->pending) {
entry = list_entry(ptr, drm_mach64_freelist_t, list);
ofs = entry->ring_ofs;
if (entry->discard &&
((head < tail && (ofs < head || ofs >= tail)) ||
(head > tail && (ofs < head && ofs >= tail)))) {
#if MACH64_EXTRA_CHECKING
int i;
for (i = head; i != tail; i = (i + 4) & ring->tail_mask)
{
u32 o1 = le32_to_cpu(((u32 *) ring->
start)[i + 1]);
u32 o2 = GETBUFADDR(entry->buf);
if (o1 == o2) {
DRM_ERROR
("Attempting to free used buffer: "
"i=%d buf=0x%08x\n",
i, o1);
mach64_dump_ring_info(dev_priv);
return -1;
}
}
#endif
/* found a processed buffer */
entry->buf->pending = 0;
list_del(ptr);
list_add_tail(ptr, &dev_priv->free_list);
DRM_DEBUG
("freed processed buffer (head=%d tail=%d "
"buf ring ofs=%d).\n",
head, tail, ofs);
return 0;
}
}
return 1;
}
struct drm_buf *mach64_freelist_get(drm_mach64_private_t *dev_priv)
{
drm_mach64_descriptor_ring_t *ring = &dev_priv->ring;
drm_mach64_freelist_t *entry;
struct list_head *ptr;
int t;
if (list_empty(&dev_priv->free_list)) {
if (list_empty(&dev_priv->pending)) {
DRM_ERROR
("Couldn't get buffer - pending and free lists empty\n");
t = 0;
list_for_each(ptr, &dev_priv->placeholders) {
t++;
}
DRM_INFO("Placeholders: %d\n", t);
return NULL;
}
for (t = 0; t < dev_priv->usec_timeout; t++) {
int ret;
ret = mach64_do_reclaim_completed(dev_priv);
if (ret == 0)
goto _freelist_entry_found;
if (ret < 0)
return NULL;
DRM_UDELAY(1);
}
mach64_dump_ring_info(dev_priv);
DRM_ERROR
("timeout waiting for buffers: ring head_addr: 0x%08x head: %d tail: %d\n",
ring->head_addr, ring->head, ring->tail);
return NULL;
}
_freelist_entry_found:
ptr = dev_priv->free_list.next;
list_del(ptr);
entry = list_entry(ptr, drm_mach64_freelist_t, list);
entry->buf->used = 0;
list_add_tail(ptr, &dev_priv->placeholders);
return entry->buf;
}
int mach64_freelist_put(drm_mach64_private_t *dev_priv, struct drm_buf *copy_buf)
{
struct list_head *ptr;
drm_mach64_freelist_t *entry;
#if MACH64_EXTRA_CHECKING
list_for_each(ptr, &dev_priv->pending) {
entry = list_entry(ptr, drm_mach64_freelist_t, list);
if (copy_buf == entry->buf) {
DRM_ERROR("Trying to release a pending buf\n");
return -EFAULT;
}
}
#endif
ptr = dev_priv->placeholders.next;
entry = list_entry(ptr, drm_mach64_freelist_t, list);
copy_buf->pending = 0;
copy_buf->used = 0;
entry->buf = copy_buf;
entry->discard = 1;
list_del(ptr);
list_add_tail(ptr, &dev_priv->free_list);
return 0;
}
/*@}*/
/*******************************************************************/
/** \name DMA buffer request and submission IOCTL handler */
/*@{*/
static int mach64_dma_get_buffers(struct drm_device *dev,
struct drm_file *file_priv,
struct drm_dma * d)
{
int i;
struct drm_buf *buf;
drm_mach64_private_t *dev_priv = dev->dev_private;
for (i = d->granted_count; i < d->request_count; i++) {
buf = mach64_freelist_get(dev_priv);
#if MACH64_EXTRA_CHECKING
if (!buf)
return -EFAULT;
#else
if (!buf)
return -EAGAIN;
#endif
buf->file_priv = file_priv;
if (DRM_COPY_TO_USER(&d->request_indices[i], &buf->idx,
sizeof(buf->idx)))
return -EFAULT;
if (DRM_COPY_TO_USER(&d->request_sizes[i], &buf->total,
sizeof(buf->total)))
return -EFAULT;
d->granted_count++;
}
return 0;
}
int mach64_dma_buffers(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_device_dma *dma = dev->dma;
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",
DRM_CURRENTPID, 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",
DRM_CURRENTPID, d->request_count, dma->buf_count);
ret = -EINVAL;
}
d->granted_count = 0;
if (d->request_count) {
ret = mach64_dma_get_buffers(dev, file_priv, d);
}
return ret;
}
void mach64_driver_lastclose(struct drm_device * dev)
{
mach64_do_cleanup_dma(dev);
}
/*@}*/
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