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/*
* Dynamic reconfiguration memory support
*
* Copyright 2017 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) "drmem: " fmt
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/memblock.h>
#include <asm/prom.h>
#include <asm/drmem.h>
static struct drmem_lmb_info __drmem_info;
struct drmem_lmb_info *drmem_info = &__drmem_info;
u64 drmem_lmb_memory_max(void)
{
struct drmem_lmb *last_lmb;
last_lmb = &drmem_info->lmbs[drmem_info->n_lmbs - 1];
return last_lmb->base_addr + drmem_lmb_size();
}
static u32 drmem_lmb_flags(struct drmem_lmb *lmb)
{
/*
* Return the value of the lmb flags field minus the reserved
* bit used internally for hotplug processing.
*/
return lmb->flags & ~DRMEM_LMB_RESERVED;
}
static struct property *clone_property(struct property *prop, u32 prop_sz)
{
struct property *new_prop;
new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
if (!new_prop)
return NULL;
new_prop->name = kstrdup(prop->name, GFP_KERNEL);
new_prop->value = kzalloc(prop_sz, GFP_KERNEL);
if (!new_prop->name || !new_prop->value) {
kfree(new_prop->name);
kfree(new_prop->value);
kfree(new_prop);
return NULL;
}
new_prop->length = prop_sz;
#if defined(CONFIG_OF_DYNAMIC)
of_property_set_flag(new_prop, OF_DYNAMIC);
#endif
return new_prop;
}
static int drmem_update_dt_v1(struct device_node *memory,
struct property *prop)
{
struct property *new_prop;
struct of_drconf_cell_v1 *dr_cell;
struct drmem_lmb *lmb;
u32 *p;
new_prop = clone_property(prop, prop->length);
if (!new_prop)
return -1;
p = new_prop->value;
*p++ = cpu_to_be32(drmem_info->n_lmbs);
dr_cell = (struct of_drconf_cell_v1 *)p;
for_each_drmem_lmb(lmb) {
dr_cell->base_addr = cpu_to_be64(lmb->base_addr);
dr_cell->drc_index = cpu_to_be32(lmb->drc_index);
dr_cell->aa_index = cpu_to_be32(lmb->aa_index);
dr_cell->flags = cpu_to_be32(drmem_lmb_flags(lmb));
dr_cell++;
}
of_update_property(memory, new_prop);
return 0;
}
static void init_drconf_v2_cell(struct of_drconf_cell_v2 *dr_cell,
struct drmem_lmb *lmb)
{
dr_cell->base_addr = cpu_to_be64(lmb->base_addr);
dr_cell->drc_index = cpu_to_be32(lmb->drc_index);
dr_cell->aa_index = cpu_to_be32(lmb->aa_index);
dr_cell->flags = cpu_to_be32(drmem_lmb_flags(lmb));
}
static int drmem_update_dt_v2(struct device_node *memory,
struct property *prop)
{
struct property *new_prop;
struct of_drconf_cell_v2 *dr_cell;
struct drmem_lmb *lmb, *prev_lmb;
u32 lmb_sets, prop_sz, seq_lmbs;
u32 *p;
/* First pass, determine how many LMB sets are needed. */
lmb_sets = 0;
prev_lmb = NULL;
for_each_drmem_lmb(lmb) {
if (!prev_lmb) {
prev_lmb = lmb;
lmb_sets++;
continue;
}
if (prev_lmb->aa_index != lmb->aa_index ||
drmem_lmb_flags(prev_lmb) != drmem_lmb_flags(lmb))
lmb_sets++;
prev_lmb = lmb;
}
prop_sz = lmb_sets * sizeof(*dr_cell) + sizeof(__be32);
new_prop = clone_property(prop, prop_sz);
if (!new_prop)
return -1;
p = new_prop->value;
*p++ = cpu_to_be32(lmb_sets);
dr_cell = (struct of_drconf_cell_v2 *)p;
/* Second pass, populate the LMB set data */
prev_lmb = NULL;
seq_lmbs = 0;
for_each_drmem_lmb(lmb) {
if (prev_lmb == NULL) {
/* Start of first LMB set */
prev_lmb = lmb;
init_drconf_v2_cell(dr_cell, lmb);
seq_lmbs++;
continue;
}
if (prev_lmb->aa_index != lmb->aa_index ||
drmem_lmb_flags(prev_lmb) != drmem_lmb_flags(lmb)) {
/* end of one set, start of another */
dr_cell->seq_lmbs = cpu_to_be32(seq_lmbs);
dr_cell++;
init_drconf_v2_cell(dr_cell, lmb);
seq_lmbs = 1;
} else {
seq_lmbs++;
}
prev_lmb = lmb;
}
/* close out last LMB set */
dr_cell->seq_lmbs = cpu_to_be32(seq_lmbs);
of_update_property(memory, new_prop);
return 0;
}
int drmem_update_dt(void)
{
struct device_node *memory;
struct property *prop;
int rc = -1;
memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
if (!memory)
return -1;
prop = of_find_property(memory, "ibm,dynamic-memory", NULL);
if (prop) {
rc = drmem_update_dt_v1(memory, prop);
} else {
prop = of_find_property(memory, "ibm,dynamic-memory-v2", NULL);
if (prop)
rc = drmem_update_dt_v2(memory, prop);
}
of_node_put(memory);
return rc;
}
static void __init read_drconf_v1_cell(struct drmem_lmb *lmb,
const __be32 **prop)
{
const __be32 *p = *prop;
lmb->base_addr = dt_mem_next_cell(dt_root_addr_cells, &p);
lmb->drc_index = of_read_number(p++, 1);
p++; /* skip reserved field */
lmb->aa_index = of_read_number(p++, 1);
lmb->flags = of_read_number(p++, 1);
*prop = p;
}
static void __init __walk_drmem_v1_lmbs(const __be32 *prop, const __be32 *usm,
void (*func)(struct drmem_lmb *, const __be32 **))
{
struct drmem_lmb lmb;
u32 i, n_lmbs;
n_lmbs = of_read_number(prop++, 1);
if (n_lmbs == 0)
return;
for (i = 0; i < n_lmbs; i++) {
read_drconf_v1_cell(&lmb, &prop);
func(&lmb, &usm);
}
}
static void __init read_drconf_v2_cell(struct of_drconf_cell_v2 *dr_cell,
const __be32 **prop)
{
const __be32 *p = *prop;
dr_cell->seq_lmbs = of_read_number(p++, 1);
dr_cell->base_addr = dt_mem_next_cell(dt_root_addr_cells, &p);
dr_cell->drc_index = of_read_number(p++, 1);
dr_cell->aa_index = of_read_number(p++, 1);
dr_cell->flags = of_read_number(p++, 1);
*prop = p;
}
static void __init __walk_drmem_v2_lmbs(const __be32 *prop, const __be32 *usm,
void (*func)(struct drmem_lmb *, const __be32 **))
{
struct of_drconf_cell_v2 dr_cell;
struct drmem_lmb lmb;
u32 i, j, lmb_sets;
lmb_sets = of_read_number(prop++, 1);
if (lmb_sets <
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