allwinner: Introduce basic platform support
This platform supports Allwinner's SoCs with ARMv8 cores. So far they
all sport a single cluster of Cortex-A53 cores.
"sunxi" is the original code name used for this platform, and since it
appears in the Linux kernel and in U-Boot as well, we use it here as a
short file name prefix and for identifiers.
This port includes BL31 support only. U-Boot's SPL takes the role of the
primary loader, also doing the DRAM initialization. It then loads the
rest of the firmware, namely ATF and U-Boot (BL33), then hands execution
over to ATF.
This commit includes the basic platform code shared across all SoCs.
There is no platform.mk yet.
[Andre: moved files into proper directories, supported RESET_TO_BL31,
various clean ups and simplifications ]
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/allwinner/common/sunxi_pm.c b/plat/allwinner/common/sunxi_pm.c
new file mode 100644
index 0000000..c73400e
--- /dev/null
+++ b/plat/allwinner/common/sunxi_pm.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <debug.h>
+#include <delay_timer.h>
+#include <mmio.h>
+#include <platform.h>
+#include <platform_def.h>
+#include <psci.h>
+#include <sunxi_mmap.h>
+
+#define SUNXI_WDOG0_CTRL_REG (SUNXI_WDOG_BASE + 0x0010)
+#define SUNXI_WDOG0_CFG_REG (SUNXI_WDOG_BASE + 0x0014)
+#define SUNXI_WDOG0_MODE_REG (SUNXI_WDOG_BASE + 0x0018)
+
+static void __dead2 sunxi_system_off(void)
+{
+ ERROR("PSCI: Full shutdown not implemented, halting\n");
+ wfi();
+ panic();
+}
+
+static void __dead2 sunxi_system_reset(void)
+{
+ /* Reset the whole system when the watchdog times out */
+ mmio_write_32(SUNXI_WDOG0_CFG_REG, 1);
+ /* Enable the watchdog with the shortest timeout (0.5 seconds) */
+ mmio_write_32(SUNXI_WDOG0_MODE_REG, (0 << 4) | 1);
+ /* Wait for twice the watchdog timeout before panicking */
+ mdelay(1000);
+
+ ERROR("PSCI: System reset failed\n");
+ wfi();
+ panic();
+}
+
+static plat_psci_ops_t sunxi_psci_ops = {
+ .system_off = sunxi_system_off,
+ .system_reset = sunxi_system_reset,
+};
+
+int plat_setup_psci_ops(uintptr_t sec_entrypoint,
+ const plat_psci_ops_t **psci_ops)
+{
+ assert(psci_ops);
+
+ *psci_ops = &sunxi_psci_ops;
+
+ return 0;
+}