ARM:vt8500: Convert to use .restart and remove arch_reset()

Removed system.h as it only contained an inline for arch_reset()
Changed the existing board files to use .restart in there machine
descriptions.

Added device tree support for the restart controller.
Device tree support for mach-vt8500 is still a work-in-progress.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 54 insertions, 0 deletions

diff --git a/arch/arm/mach-vt8500/restart.c b/arch/arm/mach-vt8500/restart.c
new file mode 100644
index 000000000000..497e89a5e130
--- /dev/null
+++ b/arch/arm/mach-vt8500/restart.c
@@ -0,0 +1,54 @@
+/* linux/arch/arm/mach-vt8500/restart.c
+ *
+ * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#define LEGACY_PMC_BASE		0xD8130000
+#define WMT_PRIZM_PMSR_REG	0x60
+
+static void __iomem *pmc_base;
+
+void wmt_setup_restart(void)
+{
+	struct device_node *np;
+
+	/*
+	 * Check if Power Mgmt Controller node is present in device tree. If no
+	 * device tree node, use the legacy PMSR value (valid for all current
+	 * SoCs).
+	 */
+	np = of_find_compatible_node(NULL, NULL, "wmt,prizm-pmc");
+	if (np) {
+		pmc_base = of_iomap(np, 0);
+
+		if (!pmc_base)
+			pr_err("%s:of_iomap(pmc) failed\n", __func__);
+
+		of_node_put(np);
+	} else {
+		pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
+		if (!pmc_base) {
+			pr_err("%s:ioremap(rstc) failed\n", __func__);
+			return;
+		}
+	}
+}
+
+void wmt_restart(char mode, const char *cmd)
+{
+	if (pmc_base)
+		writel(1, pmc_base + WMT_PRIZM_PMSR_REG);
+}