freebsd-dev/sys/powerpc/powermac/dbdma.c

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/*-
* Copyright (c) 2008 Nathan Whitehorn
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/endian.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/dbdma.h>
#include <sys/rman.h>
#include "dbdmavar.h"
static MALLOC_DEFINE(M_DBDMA, "dbdma", "DBDMA Command List");
static uint32_t dbdma_read_reg(dbdma_channel_t *, u_int);
static void dbdma_write_reg(dbdma_channel_t *, u_int, uint32_t);
static void dbdma_phys_callback(void *, bus_dma_segment_t *, int, int);
static void
dbdma_phys_callback(void *chan, bus_dma_segment_t *segs, int nsegs, int error)
{
dbdma_channel_t *channel = (dbdma_channel_t *)(chan);
channel->sc_slots_pa = segs[0].ds_addr;
dbdma_write_reg(channel, CHAN_CMDPTR, channel->sc_slots_pa);
}
int
dbdma_allocate_channel(struct resource *dbdma_regs, u_int offset,
bus_dma_tag_t parent_dma, int slots, dbdma_channel_t **chan)
{
int error = 0;
dbdma_channel_t *channel;
channel = *chan = malloc(sizeof(struct dbdma_channel), M_DBDMA,
M_WAITOK | M_ZERO);
channel->sc_regs = dbdma_regs;
channel->sc_off = offset;
dbdma_stop(channel);
channel->sc_slots_pa = 0;
error = bus_dma_tag_create(parent_dma, 16, 0, BUS_SPACE_MAXADDR_32BIT,
BUS_SPACE_MAXADDR, NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE, 0, NULL,
NULL, &(channel->sc_dmatag));
error = bus_dmamem_alloc(channel->sc_dmatag,
(void **)&channel->sc_slots, BUS_DMA_WAITOK | BUS_DMA_ZERO,
&channel->sc_dmamap);
error = bus_dmamap_load(channel->sc_dmatag, channel->sc_dmamap,
channel->sc_slots, PAGE_SIZE, dbdma_phys_callback, channel, 0);
dbdma_write_reg(channel, CHAN_CMDPTR_HI, 0);
channel->sc_nslots = slots;
return (error);
}
int
dbdma_resize_channel(dbdma_channel_t *chan, int newslots)
{
if (newslots > (PAGE_SIZE / sizeof(struct dbdma_command)))
return (-1);
chan->sc_nslots = newslots;
return (0);
}
int
dbdma_free_channel(dbdma_channel_t *chan)
{
dbdma_stop(chan);
bus_dmamem_free(chan->sc_dmatag, chan->sc_slots, chan->sc_dmamap);
bus_dma_tag_destroy(chan->sc_dmatag);
free(chan, M_DBDMA);
return (0);
}
uint16_t
dbdma_get_cmd_status(dbdma_channel_t *chan, int slot)
{
bus_dmamap_sync(chan->sc_dmatag, chan->sc_dmamap, BUS_DMASYNC_POSTREAD);
/*
* I really did mean to swap resCount and xferStatus here, to
* account for the quad-word little endian fields.
*/
return (le16toh(chan->sc_slots[slot].resCount));
}
void
dbdma_clear_cmd_status(dbdma_channel_t *chan, int slot)
{
/* See endian note above */
chan->sc_slots[slot].resCount = 0;
}
uint16_t
dbdma_get_residuals(dbdma_channel_t *chan, int slot)
{
bus_dmamap_sync(chan->sc_dmatag, chan->sc_dmamap, BUS_DMASYNC_POSTREAD);
return (le16toh(chan->sc_slots[slot].xferStatus));
}
void
dbdma_reset(dbdma_channel_t *chan)
{
dbdma_stop(chan);
dbdma_set_current_cmd(chan, 0);
dbdma_run(chan);
}
void
dbdma_run(dbdma_channel_t *chan)
{
uint32_t control_reg;
control_reg = DBDMA_STATUS_RUN | DBDMA_STATUS_PAUSE |
DBDMA_STATUS_WAKE | DBDMA_STATUS_DEAD;
control_reg <<= DBDMA_REG_MASK_SHIFT;
control_reg |= DBDMA_STATUS_RUN;
dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg);
}
void
dbdma_pause(dbdma_channel_t *chan)
{
uint32_t control_reg;
control_reg = DBDMA_STATUS_PAUSE;
control_reg <<= DBDMA_REG_MASK_SHIFT;
control_reg |= DBDMA_STATUS_PAUSE;
dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg);
}
void
dbdma_wake(dbdma_channel_t *chan)
{
uint32_t control_reg;
control_reg = DBDMA_STATUS_WAKE | DBDMA_STATUS_PAUSE |
DBDMA_STATUS_RUN | DBDMA_STATUS_DEAD;
control_reg <<= DBDMA_REG_MASK_SHIFT;
control_reg |= DBDMA_STATUS_WAKE | DBDMA_STATUS_RUN;
dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg);
}
void
dbdma_stop(dbdma_channel_t *chan)
{
uint32_t control_reg;
control_reg = DBDMA_STATUS_RUN;
control_reg <<= DBDMA_REG_MASK_SHIFT;
dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg);
while (dbdma_read_reg(chan, CHAN_STATUS_REG) & DBDMA_STATUS_ACTIVE)
DELAY(5);
}
void
dbdma_set_current_cmd(dbdma_channel_t *chan, int slot)
{
uint32_t cmd;
cmd = chan->sc_slots_pa + slot * sizeof(struct dbdma_command);
dbdma_write_reg(chan, CHAN_CMDPTR, cmd);
}
uint16_t
dbdma_get_chan_status(dbdma_channel_t *chan)
{
uint32_t status_reg;
status_reg = dbdma_read_reg(chan, CHAN_STATUS_REG);
return (status_reg & 0x0000ffff);
}
uint8_t
dbdma_get_device_status(dbdma_channel_t *chan)
{
return (dbdma_get_chan_status(chan) & 0x00ff);
}
void
dbdma_set_device_status(dbdma_channel_t *chan, uint8_t mask, uint8_t value)
{
uint32_t control_reg;
control_reg = mask;
control_reg <<= DBDMA_REG_MASK_SHIFT;
control_reg |= value;
dbdma_write_reg(chan, CHAN_CONTROL_REG, control_reg);
}
void
dbdma_set_interrupt_selector(dbdma_channel_t *chan, uint8_t mask, uint8_t val)
{
uint32_t intr_select;
intr_select = mask;
intr_select <<= DBDMA_REG_MASK_SHIFT;
intr_select |= val;
dbdma_write_reg(chan, CHAN_INTR_SELECT, intr_select);
}
void
dbdma_set_branch_selector(dbdma_channel_t *chan, uint8_t mask, uint8_t val)
{
uint32_t br_select;
br_select = mask;
br_select <<= DBDMA_REG_MASK_SHIFT;
br_select |= val;
dbdma_write_reg(chan, CHAN_BRANCH_SELECT, br_select);
}
void
dbdma_set_wait_selector(dbdma_channel_t *chan, uint8_t mask, uint8_t val)
{
uint32_t wait_select;
wait_select = mask;
wait_select <<= DBDMA_REG_MASK_SHIFT;
wait_select |= val;
dbdma_write_reg(chan, CHAN_WAIT_SELECT, wait_select);
}
void
dbdma_insert_command(dbdma_channel_t *chan, int slot, int command, int stream,
bus_addr_t data, size_t count, uint8_t interrupt, uint8_t branch,
uint8_t wait, uint32_t branch_slot)
{
struct dbdma_command cmd;
uint32_t *flip;
cmd.cmd = command;
cmd.key = stream;
cmd.intr = interrupt;
cmd.branch = branch;
cmd.wait = wait;
cmd.reqCount = count;
cmd.address = (uint32_t)(data);
if (command != DBDMA_STORE_QUAD && command != DBDMA_LOAD_QUAD)
cmd.cmdDep = chan->sc_slots_pa +
branch_slot * sizeof(struct dbdma_command);
else
cmd.cmdDep = branch_slot;
cmd.resCount = 0;
cmd.xferStatus = 0;
/*
* Move quadwords to little-endian. God only knows why
* Apple thought this was a good idea.
*/
flip = (uint32_t *)(&cmd);
flip[0] = htole32(flip[0]);
flip[1] = htole32(flip[1]);
flip[2] = htole32(flip[2]);
chan->sc_slots[slot] = cmd;
}
void
dbdma_insert_stop(dbdma_channel_t *chan, int slot)
{
dbdma_insert_command(chan, slot, DBDMA_STOP, 0, 0, 0, DBDMA_NEVER,
DBDMA_NEVER, DBDMA_NEVER, 0);
}
void
dbdma_insert_nop(dbdma_channel_t *chan, int slot)
{
dbdma_insert_command(chan, slot, DBDMA_NOP, 0, 0, 0, DBDMA_NEVER,
DBDMA_NEVER, DBDMA_NEVER, 0);
}
void
dbdma_insert_branch(dbdma_channel_t *chan, int slot, int to_slot)
{
dbdma_insert_command(chan, slot, DBDMA_NOP, 0, 0, 0, DBDMA_NEVER,
DBDMA_ALWAYS, DBDMA_NEVER, to_slot);
}
void
dbdma_sync_commands(dbdma_channel_t *chan, bus_dmasync_op_t op)
{
bus_dmamap_sync(chan->sc_dmatag, chan->sc_dmamap, op);
}
void
dbdma_save_state(dbdma_channel_t *chan)
{
chan->sc_saved_regs[0] = dbdma_read_reg(chan, CHAN_CMDPTR);
chan->sc_saved_regs[1] = dbdma_read_reg(chan, CHAN_CMDPTR_HI);
chan->sc_saved_regs[2] = dbdma_read_reg(chan, CHAN_INTR_SELECT);
chan->sc_saved_regs[3] = dbdma_read_reg(chan, CHAN_BRANCH_SELECT);
chan->sc_saved_regs[4] = dbdma_read_reg(chan, CHAN_WAIT_SELECT);
dbdma_stop(chan);
}
void
dbdma_restore_state(dbdma_channel_t *chan)
{
dbdma_wake(chan);
dbdma_write_reg(chan, CHAN_CMDPTR, chan->sc_saved_regs[0]);
dbdma_write_reg(chan, CHAN_CMDPTR_HI, chan->sc_saved_regs[1]);
dbdma_write_reg(chan, CHAN_INTR_SELECT, chan->sc_saved_regs[2]);
dbdma_write_reg(chan, CHAN_BRANCH_SELECT, chan->sc_saved_regs[3]);
dbdma_write_reg(chan, CHAN_WAIT_SELECT, chan->sc_saved_regs[4]);
}
static uint32_t
dbdma_read_reg(dbdma_channel_t *chan, u_int offset)
{
return (bus_read_4(chan->sc_regs, chan->sc_off + offset));
}
static void
dbdma_write_reg(dbdma_channel_t *chan, u_int offset, uint32_t val)
{
bus_write_4(chan->sc_regs, chan->sc_off + offset, val);
}