mirror of https://gitee.com/openkylin/linux.git
120 lines
3.2 KiB
C
120 lines
3.2 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 struct notifier_block platform_nb;
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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 void __init keystone_init(void)
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{
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keystone_pm_runtime_init();
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if (platform_nb.notifier_call)
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bus_register_notifier(&platform_bus_type, &platform_nb);
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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 void __init keystone_init_meminfo(void)
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{
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bool lpae = IS_ENABLED(CONFIG_ARM_LPAE);
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bool pvpatch = IS_ENABLED(CONFIG_ARM_PATCH_PHYS_VIRT);
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phys_addr_t offset = PHYS_OFFSET - KEYSTONE_LOW_PHYS_START;
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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;
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if (!lpae || !pvpatch) {
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pr_crit("Enable %s%s%s to run outside 32-bit space\n",
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!lpae ? __stringify(CONFIG_ARM_LPAE) : "",
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(!lpae && !pvpatch) ? " and " : "",
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!pvpatch ? __stringify(CONFIG_ARM_PATCH_PHYS_VIRT) : "");
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}
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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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}
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offset += KEYSTONE_HIGH_PHYS_START;
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__pv_phys_pfn_offset = PFN_DOWN(offset);
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__pv_offset = (offset - PAGE_OFFSET);
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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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platform_nb.notifier_call = keystone_platform_notifier;
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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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pr_info("Switching to high address space at 0x%llx\n", (u64)offset);
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}
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static const char *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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