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[Qemu-devel] [PATCH arm-devs v1 09/15] xilinx_spips: Implement automatic
From: |
Peter Crosthwaite |
Subject: |
[Qemu-devel] [PATCH arm-devs v1 09/15] xilinx_spips: Implement automatic CS |
Date: |
Wed, 3 Apr 2013 14:33:01 +1000 |
Implement the automatic CS control feature. If the MANUAL_CS bit is
cleared then the chip select stay de-asserted as long as the tx FIFO
is empty.
Signed-off-by: Peter Crosthwaite <address@hidden>
---
hw/xilinx_spips.c | 12 +++++++++---
1 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/hw/xilinx_spips.c b/hw/xilinx_spips.c
index f7d942e..16c2e1d 100644
--- a/hw/xilinx_spips.c
+++ b/hw/xilinx_spips.c
@@ -177,6 +177,12 @@ static inline int num_effective_busses(XilinxSPIPS *s)
s->regs[R_LQSPI_CFG] & LQSPI_CFG_TWO_MEM) ? s->num_busses : 1;
}
+static inline bool xilinx_spips_cs_is_set(XilinxSPIPS *s, int i, int field)
+{
+ return ~field & (1 << i) && (s->regs[R_CONFIG] & MANUAL_CS
+ || !fifo8_is_empty(&s->tx_fifo));
+}
+
static void xilinx_spips_update_cs_lines(XilinxSPIPS *s)
{
int i, j;
@@ -189,14 +195,14 @@ static void xilinx_spips_update_cs_lines(XilinxSPIPS *s)
int cs_to_set = (j * s->num_cs + i + upage) %
(s->num_cs * s->num_busses);
- if (~field & (1 << i) && !found) {
+ if (xilinx_spips_cs_is_set(s, i, field) && !found) {
DB_PRINT("selecting slave %d\n", i);
qemu_set_irq(s->cs_lines[cs_to_set], 0);
} else {
qemu_set_irq(s->cs_lines[cs_to_set], 1);
}
}
- if (~field & (1 << i)) {
+ if (xilinx_spips_cs_is_set(s, i, field)) {
found = true;
}
}
@@ -487,7 +493,7 @@ lqspi_read(void *opaque, hwaddr addr, unsigned int size)
fifo8_reset(&s->rx_fifo);
s->regs[R_CONFIG] &= ~CS;
- s->regs[R_CONFIG] |= (~(1 << slave) << CS_SHIFT) & CS;
+ s->regs[R_CONFIG] |= ((~(1 << slave) << CS_SHIFT) & CS) | MANUAL_CS;
xilinx_spips_update_cs_lines(s);
/* instruction */
--
1.7.0.4
- [Qemu-devel] [PATCH arm-devs v1 05/15] xilinx_spips: lqspi: Dont trash config register, (continued)
- [Qemu-devel] [PATCH arm-devs v1 05/15] xilinx_spips: lqspi: Dont trash config register, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 06/15] xilinx_spips: Fix QSPI FIFO size, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 07/15] xilinx_spips: Trash LQ page cache on mode change, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 08/15] xilinx_spips: Add automatic start support, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 09/15] xilinx_spips: Implement automatic CS,
Peter Crosthwaite <=
- [Qemu-devel] [PATCH arm-devs v1 10/15] xilinx_spips: Fix CTRL register RW bits, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 11/15] xilinx_spips: Fix striping behaviour, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 12/15] xilinx_spips: Debug msgs for Snoop state, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 13/15] xilinx_spips: Multiple debug verbosity levels, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 14/15] xilinx_spips: lqspi: Push more data to tx-fifo, Peter Crosthwaite, 2013/04/03
- [Qemu-devel] [PATCH arm-devs v1 15/15] xilinx_spips: lqspi: Fix byte/misaligned access, Peter Crosthwaite, 2013/04/03