M7350/kernel/arch/arm/mach-msm/memory_topology.c
2024-09-09 08:52:07 +00:00

172 lines
4.5 KiB
C

/* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <asm/setup.h>
#include <asm/errno.h>
#include <asm/sizes.h>
#include <asm/pgtable.h>
#include <linux/mutex.h>
#include <linux/memory.h>
#include <mach/msm_memtypes.h>
#include <mach/socinfo.h>
#include <mach/msm_smem.h>
#if defined(CONFIG_ARCH_MSM8960)
#include "rpm_resources.h"
#endif
struct smem_ram_ptn {
char name[16];
unsigned start;
unsigned size;
/* RAM Partition attribute: READ_ONLY, READWRITE etc. */
unsigned attr;
/* RAM Partition category: EBI0, EBI1, IRAM, IMEM */
unsigned category;
/* RAM Partition domain: APPS, MODEM, APPS & MODEM (SHARED) etc. */
unsigned domain;
/* RAM Partition type: system, bootloader, appsboot, apps etc. */
unsigned type;
/* reserved for future expansion without changing version number */
unsigned reserved2, reserved3, reserved4, reserved5;
} __attribute__ ((__packed__));
struct smem_ram_ptable {
#define _SMEM_RAM_PTABLE_MAGIC_1 0x9DA5E0A8
#define _SMEM_RAM_PTABLE_MAGIC_2 0xAF9EC4E2
unsigned magic[2];
unsigned version;
unsigned reserved1;
unsigned len;
struct smem_ram_ptn parts[32];
unsigned buf;
} __attribute__ ((__packed__));
static struct mem_region_t {
u64 start;
u64 size;
/* reserved for future use */
u64 num_partitions;
int state;
} mem_regions[MAX_NR_REGIONS];
static struct mutex mem_regions_mutex;
static unsigned int nr_mem_regions;
static int mem_regions_mask;
enum {
STATE_POWER_DOWN = 0x0,
STATE_ACTIVE = 0x2,
STATE_DEFAULT = STATE_ACTIVE
};
static int default_mask = ~0x0;
/* Return the number of chipselects populated with a memory bank */
/* This is 7x30 only and will be re-implemented in the future */
#if defined(CONFIG_ARCH_MSM7X30)
unsigned int get_num_populated_chipselects()
{
/* Currently, Linux cannot determine the memory toplogy of a target */
/* This is a kludge until all this info is figured out from smem */
/* There is atleast one chipselect populated for hosting the 1st bank */
unsigned int num_chipselects = 1;
int i;
for (i = 0; i < meminfo.nr_banks; i++) {
struct membank *bank = &meminfo.bank[i];
if (bank->start == EBI1_PHYS_OFFSET)
num_chipselects++;
}
return num_chipselects;
}
#endif
unsigned int get_num_memory_banks(void)
{
return nr_mem_regions;
}
unsigned int get_memory_bank_size(unsigned int id)
{
BUG_ON(id >= nr_mem_regions);
return mem_regions[id].size;
}
unsigned int get_memory_bank_start(unsigned int id)
{
BUG_ON(id >= nr_mem_regions);
return mem_regions[id].start;
}
int __init meminfo_init(unsigned int type, unsigned int min_bank_size)
{
unsigned int i, j;
unsigned long bank_size;
unsigned long bank_start;
unsigned long region_size;
struct smem_ram_ptable *ram_ptable;
/* physical memory banks */
unsigned int nr_mem_banks = 0;
/* logical memory regions for dmm */
nr_mem_regions = 0;
ram_ptable = smem_alloc(SMEM_USABLE_RAM_PARTITION_TABLE,
sizeof(struct smem_ram_ptable));
if (!ram_ptable) {
pr_err("Could not read ram partition table\n");
return -EINVAL;
}
pr_info("meminfo_init: smem ram ptable found: ver: %d len: %d\n",
ram_ptable->version, ram_ptable->len);
for (i = 0; i < ram_ptable->len; i++) {
/* A bank is valid only if is greater than min_bank_size. If
* non-valid memory (e.g. modem memory) became greater than
* min_bank_size, there is currently no way to differentiate.
*/
if (ram_ptable->parts[i].type == type &&
ram_ptable->parts[i].size >= min_bank_size) {
bank_start = ram_ptable->parts[i].start;
bank_size = ram_ptable->parts[i].size;
region_size = bank_size / NR_REGIONS_PER_BANK;
for (j = 0; j < NR_REGIONS_PER_BANK; j++) {
mem_regions[nr_mem_regions].start =
bank_start;
mem_regions[nr_mem_regions].size =
region_size;
mem_regions[nr_mem_regions].state =
STATE_DEFAULT;
bank_start += region_size;
nr_mem_regions++;
}
nr_mem_banks++;
}
}
mutex_init(&mem_regions_mutex);
mem_regions_mask = default_mask;
pr_info("Found %d memory banks grouped into %d memory regions\n",
nr_mem_banks, nr_mem_regions);
return 0;
}