blob: 6208a0da16d8a93eef89b3cdec425d6697407571 [file] [log] [blame]
/* Copyright (c) 2010-2012, Code Aurora Forum. 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 "smd_private.h"
#if defined(CONFIG_ARCH_MSM8960)
#include "rpm_resources.h"
#endif
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
#if defined(CONFIG_ARCH_MSM8960)
static int rpm_change_memory_state(int retention_mask,
int active_mask)
{
int ret;
struct msm_rpm_iv_pair cmd[2];
struct msm_rpm_iv_pair status[2];
cmd[0].id = MSM_RPM_ID_DDR_DMM_0;
cmd[1].id = MSM_RPM_ID_DDR_DMM_1;
status[0].id = MSM_RPM_STATUS_ID_DDR_DMM_0;
status[1].id = MSM_RPM_STATUS_ID_DDR_DMM_1;
cmd[0].value = retention_mask;
cmd[1].value = active_mask;
ret = msm_rpm_set(MSM_RPM_CTX_SET_0, cmd, 2);
if (ret < 0) {
pr_err("rpm set failed");
return -EINVAL;
}
ret = msm_rpm_get_status(status, 2);
if (ret < 0) {
pr_err("rpm status failed");
return -EINVAL;
}
if (status[0].value == retention_mask &&
status[1].value == active_mask)
return 0;
else {
pr_err("rpm failed to change memory state");
return -EINVAL;
}
}
static int switch_memory_state(int mask, int new_state, int start_region,
int end_region)
{
int final_mask = 0;
int i;
mutex_lock(&mem_regions_mutex);
for (i = start_region; i <= end_region; i++) {
if (new_state == mem_regions[i].state)
goto no_change;
/* All region states must be the same to change them */
if (mem_regions[i].state != mem_regions[start_region].state)
goto no_change;
}
if (new_state == STATE_POWER_DOWN)
final_mask = mem_regions_mask & mask;
else if (new_state == STATE_ACTIVE)
final_mask = mem_regions_mask | ~mask;
else
goto no_change;
pr_info("request memory %d to %d state switch (%d->%d)\n",
start_region, end_region, mem_regions[start_region].state,
new_state);
if (rpm_change_memory_state(final_mask, final_mask) == 0) {
for (i = start_region; i <= end_region; i++)
mem_regions[i].state = new_state;
mem_regions_mask = final_mask;
pr_info("completed memory %d to %d state switch to %d\n",
start_region, end_region, new_state);
mutex_unlock(&mem_regions_mutex);
return 0;
}
pr_err("failed memory %d to %d state switch (%d->%d)\n",
start_region, end_region, mem_regions[start_region].state,
new_state);
no_change:
mutex_unlock(&mem_regions_mutex);
return -EINVAL;
}
#else
static int switch_memory_state(int mask, int new_state, int start_region,
int end_region)
{
return -EINVAL;
}
#endif
/* The hotplug code expects the number of bytes that switched state successfully
* as the return value, so a return value of zero indicates an error
*/
int soc_change_memory_power(u64 start, u64 size, int change)
{
int i = 0;
int mask = default_mask;
u64 end = start + size;
int start_region = 0;
int end_region = 0;
if (change != STATE_ACTIVE && change != STATE_POWER_DOWN) {
pr_info("requested state transition invalid\n");
return 0;
}
/* Find the memory regions that fall within the range */
for (i = 0; i < nr_mem_regions; i++) {
if (mem_regions[i].start <= start &&
mem_regions[i].start >=
mem_regions[start_region].start) {
start_region = i;
}
if (end <= mem_regions[i].start + mem_regions[i].size) {
end_region = i;
break;
}
}
/* Set the bitmask for each region in the range */
for (i = start_region; i <= end_region; i++)
mask &= ~(0x1 << i);
if (!switch_memory_state(mask, change, start_region, end_region))
return size;
else
return 0;
}
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;
}