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kernel add
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/*
* Keystone2 based boards and SOC related code.
*
* Copyright 2013 Texas Instruments, Inc.
* Cyril Chemparathy <cyril@ti.com>
* Santosh Shilimkar <santosh.shillimkar@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/memblock.h>
#include <asm/setup.h>
#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/smp_plat.h>
#include <asm/memory.h>
#include "memory.h"
#include "keystone.h"
static unsigned long keystone_dma_pfn_offset __read_mostly;
static int keystone_platform_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
struct device *dev = data;
if (event != BUS_NOTIFY_ADD_DEVICE)
return NOTIFY_DONE;
if (!dev)
return NOTIFY_BAD;
if (!dev->of_node) {
dev->dma_pfn_offset = keystone_dma_pfn_offset;
dev_err(dev, "set dma_pfn_offset%08lx
",
dev->dma_pfn_offset);
}
return NOTIFY_OK;
}
static struct notifier_block platform_nb = {
.notifier_call = keystone_platform_notifier,
};
static void __init keystone_init(void)
{
if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) {
keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
KEYSTONE_LOW_PHYS_START);
bus_register_notifier(&platform_bus_type, &platform_nb);
}
keystone_pm_runtime_init();
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
}
static long long __init keystone_pv_fixup(void)
{
long long offset;
phys_addr_t mem_start, mem_end;
mem_start = memblock_start_of_DRAM();
mem_end = memblock_end_of_DRAM();
/* nothing to do if we are running out of the <32-bit space */
if (mem_start >= KEYSTONE_LOW_PHYS_START &&
mem_end <= KEYSTONE_LOW_PHYS_END)
return 0;
if (mem_start < KEYSTONE_HIGH_PHYS_START ||
mem_end > KEYSTONE_HIGH_PHYS_END) {
pr_crit("Invalid address space for memory (%08llx-%08llx)
",
(u64)mem_start, (u64)mem_end);
return 0;
}
offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
/* Populate the arch idmap hook */
arch_phys_to_idmap_offset = -offset;
return offset;
}
static const char *const keystone_match[] __initconst = {
"ti,k2hk",
"ti,k2e",
"ti,k2l",
"ti,k2g",
"ti,keystone",
NULL,
};
DT_MACHINE_START(KEYSTONE, "Keystone")
#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
.dma_zone_size = SZ_2G,
#endif
.smp = smp_ops(keystone_smp_ops),
.init_machine = keystone_init,
.dt_compat = keystone_match,
.pv_fixup = keystone_pv_fixup,
MACHINE_END
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