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ETRAX-FS: Add support for DMA channel resets, needed for recent linux kernels.

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* Correct numeric value for the RST state.
* Add emulation for reseting a DMA channel.
* Add a few sanity checks.
* Make it compile with debug enabled.



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5147 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
edgar_igl 2008-09-03 14:40:17 +00:00
parent b23761f959
commit 4487fd349b
1 changed files with 21 additions and 2 deletions
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23
hw/etraxfs_dma.c
View file

@ -156,7 +156,7 @@ enum {
enum dma_ch_state
{
RST = 0,
RST = 1,
STOPPED = 2,
RUNNING = 4
};
@ -398,7 +398,7 @@ static void channel_out_run(struct fs_dma_ctrl *ctrl, int c)
saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
D(fprintf(logfile, "ch=%d buf=%x after=%x saved_data_buf=%x\n",
D(printf("ch=%d buf=%x after=%x saved_data_buf=%x\n",
c,
(uint32_t)ctrl->channels[c].current_d.buf,
(uint32_t)ctrl->channels[c].current_d.after,
@ -582,6 +582,17 @@ dma_winvalid (void *opaque, target_phys_addr_t addr, uint32_t value)
addr);
}
static void
dma_update_state(struct fs_dma_ctrl *ctrl, int c)
{
if ((ctrl->channels[c].regs[RW_CFG] & 1) != 3) {
if (ctrl->channels[c].regs[RW_CFG] & 2)
ctrl->channels[c].state = STOPPED;
if (!(ctrl->channels[c].regs[RW_CFG] & 1))
ctrl->channels[c].state = RST;
}
}
static void
dma_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
{
@ -599,9 +610,13 @@ dma_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
case RW_CFG:
ctrl->channels[c].regs[addr] = value;
dma_update_state(ctrl, c);
break;
case RW_CMD:
/* continue. */
if (value & ~1)
printf("Invalid store to ch=%d RW_CMD %x\n",
c, value);
ctrl->channels[c].regs[addr] = value;
channel_continue(ctrl, c);
break;
@ -622,6 +637,10 @@ dma_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
break;
case RW_STREAM_CMD:
if (value & ~1023)
printf("Invalid store to ch=%d "
"RW_STREAMCMD %x\n",
c, value);
ctrl->channels[c].regs[addr] = value;
D(printf("stream_cmd ch=%d\n", c));
channel_stream_cmd(ctrl, c, value);