120 строки
3.3 KiB
C
120 строки
3.3 KiB
C
/*
|
|
* 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 struct notifier_block platform_nb;
|
|
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\n",
|
|
dev->dma_pfn_offset);
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static void __init keystone_init(void)
|
|
{
|
|
keystone_pm_runtime_init();
|
|
if (platform_nb.notifier_call)
|
|
bus_register_notifier(&platform_bus_type, &platform_nb);
|
|
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
|
|
}
|
|
|
|
static phys_addr_t keystone_virt_to_idmap(unsigned long x)
|
|
{
|
|
return (phys_addr_t)(x) - CONFIG_PAGE_OFFSET + KEYSTONE_LOW_PHYS_START;
|
|
}
|
|
|
|
static void __init keystone_init_meminfo(void)
|
|
{
|
|
bool lpae = IS_ENABLED(CONFIG_ARM_LPAE);
|
|
bool pvpatch = IS_ENABLED(CONFIG_ARM_PATCH_PHYS_VIRT);
|
|
phys_addr_t offset = PHYS_OFFSET - KEYSTONE_LOW_PHYS_START;
|
|
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;
|
|
|
|
if (!lpae || !pvpatch) {
|
|
pr_crit("Enable %s%s%s to run outside 32-bit space\n",
|
|
!lpae ? __stringify(CONFIG_ARM_LPAE) : "",
|
|
(!lpae && !pvpatch) ? " and " : "",
|
|
!pvpatch ? __stringify(CONFIG_ARM_PATCH_PHYS_VIRT) : "");
|
|
}
|
|
|
|
if (mem_start < KEYSTONE_HIGH_PHYS_START ||
|
|
mem_end > KEYSTONE_HIGH_PHYS_END) {
|
|
pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
|
|
(u64)mem_start, (u64)mem_end);
|
|
}
|
|
|
|
offset += KEYSTONE_HIGH_PHYS_START;
|
|
__pv_phys_pfn_offset = PFN_DOWN(offset);
|
|
__pv_offset = (offset - PAGE_OFFSET);
|
|
|
|
/* Populate the arch idmap hook */
|
|
arch_virt_to_idmap = keystone_virt_to_idmap;
|
|
platform_nb.notifier_call = keystone_platform_notifier;
|
|
keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
|
|
KEYSTONE_LOW_PHYS_START);
|
|
|
|
pr_info("Switching to high address space at 0x%llx\n", (u64)offset);
|
|
}
|
|
|
|
static const char *const keystone_match[] __initconst = {
|
|
"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,
|
|
.init_meminfo = keystone_init_meminfo,
|
|
MACHINE_END
|