[Skiboot] [PATCH 5/6] plat/qemu: initialize as an astbmc if a bt device is available

[Cédric Le Goater]

BT devices are defined on the qemu command line and the device tree is
populated in consequence. This patch checks if such a device is
available when the platform is probed. If this is the case,
initialization is done as it would have been with a real AST BMC.

The IPMI power/reboot operations can also be used, they are protected
by ipmi_present() when no BT device is available.

Signed-off-by: Cédric Le Goater <clg at fr.ibm.com>
---

 It seems complex to "hardcode" a BT device in a PowerNV guest due to
 the way it is defined in qemu and also because qemu maintainers
 rather have devices defined on the command line.

 platforms/astbmc/qemu.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/platforms/astbmc/qemu.c b/platforms/astbmc/qemu.c
index 7b72ea668d7d..11d3a99339d8 100644
--- a/platforms/astbmc/qemu.c
+++ b/platforms/astbmc/qemu.c
@@ -21,11 +21,22 @@
 #include <console.h>
 #include <opal.h>
 #include <psi.h>
+#include <ipmi.h>
 
 #include "astbmc.h"
 
+static bool has_bt_device;
+
 static void qemu_init(void)
 {
+	/* The BT device is available, so we can initialize as if a
+	 * real AST BMC was here.
+	 */
+	if (has_bt_device) {
+		astbmc_init();
+		return;
+	}
+
 	/* Setup UART console for use by Linux via OPAL API */
 	if (!dummy_console_enabled())
 		uart_setup_opal_console();
@@ -60,12 +71,19 @@ static void qemu_dt_fixup_rtc(struct dt_node *lpc)
 static void qemu_dt_fixup(void)
 {
 	struct dt_node *primary_lpc = astbmc_get_primary_lpc();
+	struct dt_node *bt;
 
 	if (!primary_lpc)
 		return;
 
 	qemu_dt_fixup_rtc(primary_lpc);
 	astbmc_fixup_dt_uart(primary_lpc);
+
+	/* check if the BT device was defined by qemu */
+	dt_for_each_child(primary_lpc, bt) {
+		if (dt_node_is_compatible(bt, "bt"))
+			has_bt_device = true;
+	}
 }
 
 static bool qemu_probe(void)
@@ -93,4 +111,7 @@ DECLARE_PLATFORM(qemu) = {
 	.probe		= qemu_probe,
 	.init		= qemu_init,
 	.external_irq   = astbmc_ext_irq_serirq_cpld,
+	.cec_power_down = astbmc_ipmi_power_down,
+	.cec_reboot     = astbmc_ipmi_reboot,
+	.terminate	= ipmi_terminate,
 };
-- 
2.1.4