arch/arm/mach-msm/memory_topology.c - kernel/msm - Git at Google

 /* Copyright (c) 2010-2012, 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 "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) || defined(CONFIG_ARCH_MSM8930)) \
 	&& defined(CONFIG_ENABLE_DMM)
 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;
 }
	/* Copyright (c) 2010-2012, 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 "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) \|\| defined(CONFIG_ARCH_MSM8930)) \
	&& defined(CONFIG_ENABLE_DMM)
	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;
	}