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