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xilinx_spips: lqspi: Push more data to tx-fifo 

Do 16 words per fifo flush. Increases performance and decreases
debug verbosity. This data depth has no real hardware analogue,
so just go with something that has reasonable performance.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Message-id: 5621ee4621941d3639b5cacfdec26bd3148f31d5.1369117359.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Crosthwaite 2013-06-03 17:17:44 +01:00 committed by Peter Maydell
parent 4a5b6fa8d9
commit a66418f6f1
1 changed files with 7 additions and 4 deletions
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11
hw/ssi/xilinx_spips.c
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@ -608,11 +608,14 @@ lqspi_read(void *opaque, hwaddr addr, unsigned int size)
DB_PRINT_L(0, "starting QSPI data read\n");
for (i = 0; i < LQSPI_CACHE_SIZE / 4; ++i) {
tx_data_bytes(s, 0, 4);
while (cache_entry < LQSPI_CACHE_SIZE / 4) {
for (i = 0; i < 16; ++i) {
tx_data_bytes(s, 0, 4);
}
xilinx_spips_flush_txfifo(s);
rx_data_bytes(s, &q->lqspi_buf[cache_entry], 4);
cache_entry++;
for (i = 0; i < 16; ++i) {
rx_data_bytes(s, &q->lqspi_buf[cache_entry++], 4);
}
}
s->regs[R_LQSPI_STS] &= ~LQSPI_CFG_U_PAGE;