amd/seattle: Initial revision of AMD Seattle support

This patch add initial (minimal) platform support for AMD Seattle,
which mainly just define the matching ID, and specify system_off,
and system_reset mechanism.

Initially, the firmware only support a subset of PSCI-0.2 functions,
system-off and system-reset. The mechanism for bring up auxiliary processors
is still using spin-table.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Reviewed-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

2 files changed, 69 insertions, 0 deletions

diff --git a/xen/arch/arm/platforms/Makefile b/xen/arch/arm/platforms/Makefile
index 3b92ddefbf..8f47c168ea 100644
--- a/xen/arch/arm/platforms/Makefile
+++ b/xen/arch/arm/platforms/Makefile
@@ -4,4 +4,5 @@ obj-$(CONFIG_ARM_32) += exynos5.o
 obj-$(CONFIG_ARM_32) += midway.o
 obj-$(CONFIG_ARM_32) += omap5.o
 obj-$(CONFIG_ARM_32) += sunxi.o
+obj-$(CONFIG_ARM_64) += seattle.o
 obj-$(CONFIG_ARM_64) += xgene-storm.o
diff --git a/xen/arch/arm/platforms/seattle.c b/xen/arch/arm/platforms/seattle.c
new file mode 100644
index 0000000000..edfc391407
--- /dev/null
+++ b/xen/arch/arm/platforms/seattle.c
@@ -0,0 +1,68 @@
+/*
+ * xen/arch/arm/seattle.c
+ *
+ * AMD Seattle specific settings
+ *
+ * Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
+ * Copyright (c) 2014 Advance Micro Devices Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/platform.h>
+#include <asm/psci.h>
+
+static const char * const seattle_dt_compat[] __initconst =
+{
+    "amd,seattle",
+    NULL
+};
+
+/* Seattle firmware only implements PSCI handler for
+ * system off and system reset at this point.
+ * This is temporary until full PSCI-0.2 is supported.
+ * Then, these function will be removed.
+ */
+static noinline void seattle_smc_psci(register_t func_id)
+{
+    asm volatile(
+        "smc #0"
+        : "+r" (func_id)
+        :);
+}
+
+static void seattle_system_reset(void)
+{
+    seattle_smc_psci(PSCI_0_2_FN_SYSTEM_RESET);
+}
+
+static void seattle_system_off(void)
+{
+    seattle_smc_psci(PSCI_0_2_FN_SYSTEM_OFF);
+}
+
+PLATFORM_START(seattle, "SEATTLE")
+    .compatible = seattle_dt_compat,
+    .reset      = seattle_system_reset,
+    .poweroff   = seattle_system_off,
+
+    .dom0_gnttab_start = 0xe1700000,
+    .dom0_gnttab_size = 0x20000,
+PLATFORM_END
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */