arch/arm/mach-msm/memory_topology.c - kernel/msm - Gitiles

 /* Copyright (c) 2010-2011, 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;
 	int mask;
 	struct mutex state_mutex;
 } mem_regions[MAX_NR_REGIONS];

 static unsigned int nr_mem_regions;

 enum {
 	STATE_POWER_DOWN = 0x0,
 	STATE_ACTIVE = 0x2,
 	STATE_DEFAULT = STATE_ACTIVE
 };

 enum {
 	MEM_NO_CHANGE = 0x0,
 	MEM_DEEP_POWER_DOWN,
 	MEM_SELF_REFRESH,
 };

 static unsigned int dmm_mode;

 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 id, int new_state)
 {
 	int mask;
 	int power_down_masks[MAX_NR_REGIONS] = { 0xFFFFFF00, 0xFFFF00FF,
 						0xFF00FFFF, 0x00FFFFFF };
 	int self_refresh_masks[MAX_NR_REGIONS] = { 0xFFFFFFF0, 0xFFFFFF0F,
 						0xFFFFF0FF, 0xFFFF0FFF };
 	mutex_lock(&mem_regions[id].state_mutex);

 	if (new_state == mem_regions[id].state)
 		goto no_change;

 	pr_info("request memory %d state switch (%d->%d) mode %d\n", id,
 			mem_regions[id].state, new_state, dmm_mode);
 	if (new_state == STATE_POWER_DOWN) {
 		if (dmm_mode == MEM_DEEP_POWER_DOWN)
 			mask = mem_regions[id].mask & power_down_masks[id];
 		else
 			mask = mem_regions[id].mask & self_refresh_masks[id];
 	} else if (new_state == STATE_ACTIVE) {
 		if (dmm_mode == MEM_DEEP_POWER_DOWN)
 			mask = mem_regions[id].mask | (~power_down_masks[id]);
 		else
 			mask = mem_regions[id].mask | (~self_refresh_masks[id]);
 	}

 	if (rpm_change_memory_state(mask, mask) == 0) {
 		mem_regions[id].state = new_state;
 		mem_regions[id].mask = mask;
 		pr_info("completed memory %d state switch to %d mode %d\n",
 				id, new_state, dmm_mode);
 		mutex_unlock(&mem_regions[id].state_mutex);
 		return 0;
 	}

 	pr_err("failed memory %d state switch (%d->%d) mode %d\n", id,
 			mem_regions[id].state, new_state, dmm_mode);
 no_change:
 	mutex_unlock(&mem_regions[id].state_mutex);
 	return -EINVAL;
 }
 #else

 static int switch_memory_state(int id, int new_state)
 {
 	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 match = 0;

 	/* Find the memory region starting just below start */
 	for (i = 0; i < nr_mem_regions; i++) {
 		if (mem_regions[i].start <= start &&
 			mem_regions[i].start >= mem_regions[match].start) {
 				match = i;
 		}
 	}

 	if (start + size > mem_regions[match].start + mem_regions[match].size) {
 		pr_info("passed size exceeds size of memory bank\n");
 		return 0;
 	}

 	if (change != STATE_ACTIVE && change != STATE_POWER_DOWN) {
 		pr_info("requested state transition invalid\n");
 		return 0;
 	}

 	if (!switch_memory_state(match, change))
 		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;
 	unsigned long bank_size;
 	unsigned long bank_start;
 	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;
 	}

 	/* Determine power control mode based on the hw version */
 	/* This check will be removed when PASR is fully supported */
 	if (cpu_is_msm8960() &&
 		SOCINFO_VERSION_MAJOR(socinfo_get_version()) < 2)
 		dmm_mode = MEM_DEEP_POWER_DOWN;
 	else
 		dmm_mode = MEM_SELF_REFRESH;

 	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++) {
 		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;
 			/* Divide into logical memory regions of same size */
 			while (bank_size) {
 				mem_regions[nr_mem_regions].start =
 					bank_start;
 				mem_regions[nr_mem_regions].size =
 					MIN_MEMORY_BLOCK_SIZE;
 				mutex_init(&mem_regions[nr_mem_regions]
 							.state_mutex);
 				mem_regions[nr_mem_regions].state =
 							STATE_DEFAULT;
 				mem_regions[nr_mem_regions].mask = default_mask;
 				bank_start += MIN_MEMORY_BLOCK_SIZE;
 				bank_size -= MIN_MEMORY_BLOCK_SIZE;
 				nr_mem_regions++;
 			}
 			nr_mem_banks++;
 		}
 	}
 	pr_info("Found %d memory banks grouped into %d memory regions\n",
 			nr_mem_banks, nr_mem_regions);
 	return 0;
 }
	/* Copyright (c) 2010-2011, 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;
	int mask;
	struct mutex state_mutex;
	} mem_regions[MAX_NR_REGIONS];

	static unsigned int nr_mem_regions;

	enum {
	STATE_POWER_DOWN = 0x0,
	STATE_ACTIVE = 0x2,
	STATE_DEFAULT = STATE_ACTIVE
	};

	enum {
	MEM_NO_CHANGE = 0x0,
	MEM_DEEP_POWER_DOWN,
	MEM_SELF_REFRESH,
	};

	static unsigned int dmm_mode;

	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 id, int new_state)
	{
	int mask;
	int power_down_masks[MAX_NR_REGIONS] = { 0xFFFFFF00, 0xFFFF00FF,
	0xFF00FFFF, 0x00FFFFFF };
	int self_refresh_masks[MAX_NR_REGIONS] = { 0xFFFFFFF0, 0xFFFFFF0F,
	0xFFFFF0FF, 0xFFFF0FFF };
	mutex_lock(&mem_regions[id].state_mutex);

	if (new_state == mem_regions[id].state)
	goto no_change;

	pr_info("request memory %d state switch (%d->%d) mode %d\n", id,
	mem_regions[id].state, new_state, dmm_mode);
	if (new_state == STATE_POWER_DOWN) {
	if (dmm_mode == MEM_DEEP_POWER_DOWN)
	mask = mem_regions[id].mask & power_down_masks[id];
	else
	mask = mem_regions[id].mask & self_refresh_masks[id];
	} else if (new_state == STATE_ACTIVE) {
	if (dmm_mode == MEM_DEEP_POWER_DOWN)
	mask = mem_regions[id].mask \| (~power_down_masks[id]);
	else
	mask = mem_regions[id].mask \| (~self_refresh_masks[id]);
	}

	if (rpm_change_memory_state(mask, mask) == 0) {
	mem_regions[id].state = new_state;
	mem_regions[id].mask = mask;
	pr_info("completed memory %d state switch to %d mode %d\n",
	id, new_state, dmm_mode);
	mutex_unlock(&mem_regions[id].state_mutex);
	return 0;
	}

	pr_err("failed memory %d state switch (%d->%d) mode %d\n", id,
	mem_regions[id].state, new_state, dmm_mode);
	no_change:
	mutex_unlock(&mem_regions[id].state_mutex);
	return -EINVAL;
	}
	#else

	static int switch_memory_state(int id, int new_state)
	{
	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 match = 0;

	/* Find the memory region starting just below start */
	for (i = 0; i < nr_mem_regions; i++) {
	if (mem_regions[i].start <= start &&
	mem_regions[i].start >= mem_regions[match].start) {
	match = i;
	}
	}

	if (start + size > mem_regions[match].start + mem_regions[match].size) {
	pr_info("passed size exceeds size of memory bank\n");
	return 0;
	}

	if (change != STATE_ACTIVE && change != STATE_POWER_DOWN) {
	pr_info("requested state transition invalid\n");
	return 0;
	}

	if (!switch_memory_state(match, change))
	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;
	unsigned long bank_size;
	unsigned long bank_start;
	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;
	}

	/* Determine power control mode based on the hw version */
	/* This check will be removed when PASR is fully supported */
	if (cpu_is_msm8960() &&
	SOCINFO_VERSION_MAJOR(socinfo_get_version()) < 2)
	dmm_mode = MEM_DEEP_POWER_DOWN;
	else
	dmm_mode = MEM_SELF_REFRESH;

	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++) {
	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;
	/* Divide into logical memory regions of same size */
	while (bank_size) {
	mem_regions[nr_mem_regions].start =
	bank_start;
	mem_regions[nr_mem_regions].size =
	MIN_MEMORY_BLOCK_SIZE;
	mutex_init(&mem_regions[nr_mem_regions]
	.state_mutex);
	mem_regions[nr_mem_regions].state =
	STATE_DEFAULT;
	mem_regions[nr_mem_regions].mask = default_mask;
	bank_start += MIN_MEMORY_BLOCK_SIZE;
	bank_size -= MIN_MEMORY_BLOCK_SIZE;
	nr_mem_regions++;
	}
	nr_mem_banks++;
	}
	}
	pr_info("Found %d memory banks grouped into %d memory regions\n",
	nr_mem_banks, nr_mem_regions);
	return 0;
	}