ARM: uniphier: add PSCI support for UniPhier ARMv7 SoCs

Currently, only the CPU_ON function is supported.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/mach-uniphier/debug.h

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2016 Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __DEBUG_H__
+#define __DEBUG_H__
+
+#include <linux/io.h>
+#include <linux/serial_reg.h>
+
+#define DEBUG_UART_BASE		0x54006800
+#define UART_SHIFT 2
+
+#define UNIPHIER_UART_TX		0
+#define UNIPHIER_UART_LSR		(5 * 4)
+
+/* All functions are inline so that they can be called from .secure section. */
+
+#ifdef DEBUG
+static inline void debug_putc(int c)
+{
+	void __iomem *base = (void __iomem *)DEBUG_UART_BASE;
+
+	while (!(readl(base + UNIPHIER_UART_LSR) & UART_LSR_THRE))
+		;
+
+	writel(c, base + UNIPHIER_UART_TX);
+}
+
+static inline void debug_puts(const char *s)
+{
+	while (*s) {
+		if (*s == '\n')
+			debug_putc('\r');
+
+		debug_putc(*s++);
+	}
+}
+
+static inline void debug_puth(unsigned long val)
+{
+	int i;
+	unsigned char c;
+
+	for (i = 8; i--; ) {
+		c = ((val >> (i * 4)) & 0xf);
+		c += (c >= 10) ? 'a' - 10 : '0';
+		debug_putc(c);
+	}
+}
+#else
+static inline void debug_putc(int c)
+{
+}
+
+static inline void debug_puts(const char *s)
+{
+}
+
+static inline void debug_puth(unsigned long val)
+{
+}
+#endif
+
+#endif /* __DEBUG_H__ */