It is sometime useful to verify a device chip select polarity
on a SPI bus. Since we have this information available, display
it in the 'info qtree' monitor output:
$ qemu-system-arm -M lm3s6965evb -monitor stdio -S
(qemu) info qtree
[...]
dev: pl022, id ""
gpio-out "sysbus-irq" 1
mmio 0000000040008000/0000000000001000
bus: ssi
type SSI
dev: ssd0323, id ""
gpio-in "" 1
gpio-in "ssi-gpio-cs" 1
chip select polarity: high <---
dev: ssi-sd, id ""
gpio-in "ssi-gpio-cs" 1
chip select polarity: low <---
bus: sd-bus
type sd-bus
dev: sd-card, id ""
spec_version = 2 (0x2)
drive = "sd0"
spi = true
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
hw/ssi/ssi.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/hw/ssi/ssi.c b/hw/ssi/ssi.c
index 4278d0e4440..4c9f8d66d23 100644
--- a/hw/ssi/ssi.c
+++ b/hw/ssi/ssi.c
@@ -17,6 +17,7 @@
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "qapi/error.h"
+#include "monitor/monitor.h"
#include "qom/object.h"
struct SSIBus {
@@ -26,10 +27,31 @@ struct SSIBus {
#define TYPE_SSI_BUS "SSI"
OBJECT_DECLARE_SIMPLE_TYPE(SSIBus, SSI_BUS)
+static void ssi_print_dev(Monitor *mon, DeviceState *dev, int indent)
+{
+ static const char *const polarity_s[] = {
+ [SSI_CS_NONE] = "unknown",
+ [SSI_CS_LOW] = "low",
+ [SSI_CS_HIGH] = "high"
+ };
+ SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(dev);
+
+ monitor_printf(mon, "%*schip select polarity: %s\n",
+ indent, "", polarity_s[ssc->cs_polarity]);
+}
+
+static void ssi_bus_class_init(ObjectClass *klass, void *data)
+{
+ BusClass *k = BUS_CLASS(klass);
+
+ k->print_dev = ssi_print_dev;
+}
+
static const TypeInfo ssi_bus_info = {
.name = TYPE_SSI_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(SSIBus),
+ .class_init = ssi_bus_class_init,
};
static void ssi_cs_default(void *opaque, int n, int level)
--
2.26.2
