ARM: vexpress/TC2: add Serial Power Controller (SPC) support

The TC2 versatile express core tile integrates a logic block that provides
the interface between the dual cluster test-chip and the M3 microcontroller
that carries out power management. The logic block, called Serial Power
Controller (SPC), contains several memory mapped registers to control among
other things low-power states, wake-up irqs and per-CPU jump addresses
registers.

This patch provides a driver that enables run-time control of features
implemented by the SPC power management control logic with an API to
be used by different subsystem drivers on top.

The SPC control logic is required to be programmed very early in the boot
process to reset secondary CPUs on the TC2 testchip, set-up jump addresses
and wake-up IRQs for power management. Hence, waiting for core changes to
be made in the device core code to enable early registration of platform
devices, the driver puts in place an early init scheme that allows kernel
drivers to initialize the SPC driver directly from the components requiring
it, if their initialization routine is called before this driver init
function during the boot process.

Device tree bindings documentation for the SPC component is also provided.

Cc: Olof Johansson <olof@lixom.net>
Cc: Amit Kucheria <amit.kucheria@linaro.org>
Cc: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Achin Gupta <achin.gupta@arm.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@arm.com>
Acked-by: Pawel Moll <pawel.moll@arm.com>
[ np: moved from drivers/mfd/ to drivers/platform/vexpress/ ]
Signed-off-by: Nicolas Pitre <nico@linaro.org>
[ PM: moved again to arch/arm/mach-vexpress, requested by Olof ]
[ PM: removed useless printk, from Olof ]
[ PM: made the driver SPC-only ]
Signed-off-by: Pawel Moll <pawel.moll@arm.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/arm/mach-vexpress/spc.h b/arch/arm/mach-vexpress/spc.h
new file mode 100644
index 000000000000..5f7e4a446a17
--- /dev/null
+++ b/arch/arm/mach-vexpress/spc.h
@@ -0,0 +1,24 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * Copyright (C) 2012 ARM Limited
+ */
+
+
+#ifndef __SPC_H_
+#define __SPC_H_
+
+int __init ve_spc_init(void __iomem *base, u32 a15_clusid);
+void ve_spc_global_wakeup_irq(bool set);
+void ve_spc_cpu_wakeup_irq(u32 cluster, u32 cpu, bool set);
+void ve_spc_set_resume_addr(u32 cluster, u32 cpu, u32 addr);
+void ve_spc_powerdown(u32 cluster, bool enable);
+
+#endif