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/*
* OMAP ram console support
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
* Author: Huzefa Kankroliwala <huzefank@ti.com>
*
* 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 "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/platform_device.h>
#include <linux/platform_data/ram_console.h>
#include <linux/memblock.h>
#include <plat/cpu.h>
#include "resetreason.h"
#include "omap_ram_console.h"
static struct resource ram_console_resources[] = {
{
.flags = IORESOURCE_MEM,
.start = OMAP_RAM_CONSOLE_START_DEFAULT,
.end = OMAP_RAM_CONSOLE_START_DEFAULT +
OMAP_RAM_CONSOLE_SIZE_DEFAULT - 1,
},
};
static struct ram_console_platform_data ram_console_pdata;
static struct platform_device ram_console_device = {
.name = "ram_console",
.id = -1,
.num_resources = ARRAY_SIZE(ram_console_resources),
.resource = ram_console_resources,
.dev = {
.platform_data = &ram_console_pdata,
},
};
static __initdata bool omap_ramconsole_inited;
/**
* omap_ram_console_register() - device_initcall to register ramconsole device
*/
static int __init omap_ram_console_register(void)
{
int ret;
if (!omap_ramconsole_inited)
return -ENODEV;
ret = platform_device_register(&ram_console_device);
if (ret) {
pr_err("%s: unable to register ram console device:"
"start=0x%08x, end=0x%08x, ret=%d\n",
__func__, (u32)ram_console_resources[0].start,
(u32)ram_console_resources[0].end, ret);
memblock_add(ram_console_resources[0].start,
(ram_console_resources[0].end -
ram_console_resources[0].start + 1));
}
return ret;
}
device_initcall(omap_ram_console_register);
/**
* omap_ram_console_init() - setup the ram console device for OMAP
* @phy_addr: physical address of the start of ram console buffer
* @size: ram console buffer size
*
* Board files call this as part of the memory reservation routine
* Depending on the choice of memory geometry and desired size,
* provide appropriate parameters.
*
* IMPORTANT: board files need to ensure that the DDR configurations
* enable self refresh mode for this to function properly.
*/
int __init omap_ram_console_init(phys_addr_t phy_addr, size_t size)
{
int ret;
/* Remove the ram console region from kernel's map */
ret = memblock_remove(phy_addr, size);
if (ret) {
pr_err("%s: unable to remove memory for ram console:"
"start=0x%08x, size=0x%08x, ret=%d\n",
__func__, (u32)phy_addr, (u32)size, ret);
return ret;
}
/* Update reset reason for platforms that have support for it */
if (cpu_is_omap44xx())
ram_console_pdata.bootinfo = omap4_get_resetreason();
ram_console_resources[0].start = phy_addr;
ram_console_resources[0].end = phy_addr + size - 1;
/* flag for registration */
omap_ramconsole_inited = true;
return ret;
}
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