c8ca2b4b29
Make the init_meminfo function return the offset to be applied to the phys-to-virt translation constants. This allows us to move the update into generic code, along with the requirements for this update. This avoids platforms having to know the details of the phys-to-virt translation support. Acked-by: Santosh Shilimkar <ssantosh@kernel.org> Tested-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/*
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* Keystone2 based boards and SOC related code.
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*
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* Copyright 2013 Texas Instruments, Inc.
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* Cyril Chemparathy <cyril@ti.com>
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* Santosh Shilimkar <santosh.shillimkar@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/init.h>
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#include <linux/of_platform.h>
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#include <linux/of_address.h>
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#include <linux/memblock.h>
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#include <asm/setup.h>
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#include <asm/mach/map.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/time.h>
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#include <asm/smp_plat.h>
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#include <asm/memory.h>
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#include "memory.h"
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#include "keystone.h"
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static unsigned long keystone_dma_pfn_offset __read_mostly;
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static int keystone_platform_notifier(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct device *dev = data;
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if (event != BUS_NOTIFY_ADD_DEVICE)
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return NOTIFY_DONE;
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if (!dev)
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return NOTIFY_BAD;
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if (!dev->of_node) {
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dev->dma_pfn_offset = keystone_dma_pfn_offset;
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dev_err(dev, "set dma_pfn_offset%08lx\n",
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dev->dma_pfn_offset);
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}
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return NOTIFY_OK;
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}
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static struct notifier_block platform_nb = {
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.notifier_call = keystone_platform_notifier,
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};
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static void __init keystone_init(void)
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{
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if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) {
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keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
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KEYSTONE_LOW_PHYS_START);
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bus_register_notifier(&platform_bus_type, &platform_nb);
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}
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keystone_pm_runtime_init();
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of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
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}
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static phys_addr_t keystone_virt_to_idmap(unsigned long x)
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{
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return (phys_addr_t)(x) - CONFIG_PAGE_OFFSET + KEYSTONE_LOW_PHYS_START;
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}
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static long long __init keystone_init_meminfo(void)
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{
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long long offset;
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phys_addr_t mem_start, mem_end;
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mem_start = memblock_start_of_DRAM();
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mem_end = memblock_end_of_DRAM();
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/* nothing to do if we are running out of the <32-bit space */
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if (mem_start >= KEYSTONE_LOW_PHYS_START &&
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mem_end <= KEYSTONE_LOW_PHYS_END)
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return 0;
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if (mem_start < KEYSTONE_HIGH_PHYS_START ||
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mem_end > KEYSTONE_HIGH_PHYS_END) {
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pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
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(u64)mem_start, (u64)mem_end);
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return 0;
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}
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offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
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/* Populate the arch idmap hook */
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arch_virt_to_idmap = keystone_virt_to_idmap;
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pr_info("Switching to high address space at 0x%llx\n",
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(u64)PHYS_OFFSET + (u64)offset);
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return offset;
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}
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static const char *const keystone_match[] __initconst = {
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"ti,keystone",
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NULL,
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};
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DT_MACHINE_START(KEYSTONE, "Keystone")
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#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
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.dma_zone_size = SZ_2G,
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#endif
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.smp = smp_ops(keystone_smp_ops),
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.init_machine = keystone_init,
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.dt_compat = keystone_match,
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.init_meminfo = keystone_init_meminfo,
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MACHINE_END
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