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freebsd-dev/sys/powerpc/powermac/dbdma.c
Pedro F. Giffuni 71e3c3083b sys/powerpc: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:09:59 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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);
}
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