arm: tegra: move ram console to common codes

cleanup ram console related source codes and move most of the
implementation in board files to common.c since ram console is a common
debug mechanism.

bug 873307

Signed-off-by: Haley Teng <hteng@nvidia.com>
Reviewed-on: http://git-master/r/54598
Reviewed-on: http://git-master/r/66588
(cherry picked from commit 119ce36b7bed370a528dfebc80bd79698118248d)

Change-Id: I8b769b422305101a97f1fbc99db4af48dc7d4f25
Reviewed-on: http://git-master/r/71961
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>
Reviewed-on: http://git-master/r/74552
Reviewed-by: Rohan Somvanshi <rsomvanshi@nvidia.com>
Tested-by: Rohan Somvanshi <rsomvanshi@nvidia.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index ea3ca06328ef..2acf4bdcef94 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -896,6 +896,51 @@ void __init tegra_reserve(unsigned long carveout_size, unsigned long fb_size,
 #endif
 }
 
+static struct resource ram_console_resources[] = {
+	{
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device ram_console_device = {
+	.name 		= "ram_console",
+	.id 		= -1,
+	.num_resources	= ARRAY_SIZE(ram_console_resources),
+	.resource	= ram_console_resources,
+};
+
+void __init tegra_ram_console_debug_reserve(unsigned long ram_console_size)
+{
+	struct resource *res;
+	long ret;
+
+	res = platform_get_resource(&ram_console_device, IORESOURCE_MEM, 0);
+	if (!res)
+		goto fail;
+	res->start = memblock_end_of_DRAM() - ram_console_size;
+	res->end = res->start + ram_console_size - 1;
+	ret = memblock_remove(res->start, ram_console_size);
+	if (ret)
+		goto fail;
+
+	return;
+
+fail:
+	ram_console_device.resource = NULL;
+	ram_console_device.num_resources = 0;
+	pr_err("Failed to reserve memory block for ram console\n");
+}
+
+void __init tegra_ram_console_debug_init(void)
+{
+	int err;
+
+	err = platform_device_register(&ram_console_device);
+	if (err) {
+		pr_err("%s: ram console registration failed (%d)!\n", __func__, err);
+	}
+}
+
 void __init tegra_release_bootloader_fb(void)
 {
 	/* Since bootloader fb is reserved in common.c, it is freed here. */