77 строки
1.8 KiB
C
77 строки
1.8 KiB
C
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/*
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* Dynamic reconfiguration memory support
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*
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* Copyright 2017 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "drmem: " fmt
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/memblock.h>
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#include <asm/prom.h>
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#include <asm/drmem.h>
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static struct drmem_lmb_info __drmem_info;
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struct drmem_lmb_info *drmem_info = &__drmem_info;
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#ifdef CONFIG_PPC_PSERIES
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static void __init read_drconf_v1_cell(struct drmem_lmb *lmb,
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const __be32 **prop)
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{
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const __be32 *p = *prop;
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lmb->base_addr = dt_mem_next_cell(dt_root_addr_cells, &p);
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lmb->drc_index = of_read_number(p++, 1);
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p++; /* skip reserved field */
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lmb->aa_index = of_read_number(p++, 1);
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lmb->flags = of_read_number(p++, 1);
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*prop = p;
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}
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static void __init __walk_drmem_v1_lmbs(const __be32 *prop, const __be32 *usm,
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void (*func)(struct drmem_lmb *, const __be32 **))
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{
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struct drmem_lmb lmb;
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u32 i, n_lmbs;
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n_lmbs = of_read_number(prop++, 1);
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for (i = 0; i < n_lmbs; i++) {
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read_drconf_v1_cell(&lmb, &prop);
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func(&lmb, &usm);
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}
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}
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void __init walk_drmem_lmbs_early(unsigned long node,
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void (*func)(struct drmem_lmb *, const __be32 **))
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{
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const __be32 *prop, *usm;
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int len;
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prop = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
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if (!prop || len < dt_root_size_cells * sizeof(__be32))
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return;
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drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop);
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usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", &len);
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prop = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &len);
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if (prop)
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__walk_drmem_v1_lmbs(prop, usm, func);
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memblock_dump_all();
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}
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#endif
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