| /* Copyright (c) 2014, 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 <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/mutex.h> |
| #include <soc/qcom/rpm-smd.h> |
| |
| #define RPM_MISC_REQ_TYPE 0x6373696d |
| #define RPM_MISC_REQ_DDR_HEALTH 0x31726464 |
| |
| static uint32_t mem_size; |
| static int ddr_health_set(const char *val, struct kernel_param *kp); |
| module_param_call(mem_size, ddr_health_set, param_get_uint, |
| &mem_size, 0644); |
| |
| struct ddr_health { |
| uint64_t addr; |
| uint32_t size; |
| uint32_t reserved; |
| }; |
| |
| static struct mutex lock; |
| static struct ddr_health *ddr_health; |
| static struct msm_rpm_kvp rpm_kvp; |
| |
| static int ddr_health_set(const char *val, struct kernel_param *kp) |
| { |
| int ret; |
| void *virt; |
| uint64_t old_addr = 0; |
| uint32_t old_size = 0; |
| |
| mutex_lock(&lock); |
| ret = param_set_uint(val, kp); |
| if (ret) { |
| pr_err("ddr-health: error setting value %d\n", ret); |
| mutex_unlock(&lock); |
| return ret; |
| } |
| |
| if (rpm_kvp.data) { |
| ddr_health = (struct ddr_health *)rpm_kvp.data; |
| old_addr = ddr_health->addr; |
| old_size = ddr_health->size; |
| } |
| |
| rpm_kvp.key = RPM_MISC_REQ_DDR_HEALTH; |
| |
| if (mem_size) { |
| virt = kzalloc(mem_size, GFP_KERNEL); |
| if (!virt) { |
| pr_err("ddr-health: failed to alloc mem request %x\n", |
| mem_size); |
| mutex_unlock(&lock); |
| return -ENOMEM; |
| } |
| |
| ddr_health->addr = (uint64_t)virt_to_phys(virt); |
| ddr_health->size = mem_size; |
| |
| rpm_kvp.length = sizeof(struct ddr_health); |
| rpm_kvp.data = (void *)ddr_health; |
| |
| ret = msm_rpm_send_message(MSM_RPM_CTX_ACTIVE_SET, |
| RPM_MISC_REQ_TYPE, 0, &rpm_kvp, 1); |
| if (ret) { |
| pr_err("ddr-health: send buf to RPM failed %d, %x\n", |
| ret, mem_size); |
| kfree(virt); |
| goto err; |
| } |
| } else { |
| ddr_health->addr = 0; |
| ddr_health->size = 0; |
| |
| rpm_kvp.length = sizeof(struct ddr_health); |
| rpm_kvp.data = (void *)ddr_health; |
| |
| ret = msm_rpm_send_message(MSM_RPM_CTX_ACTIVE_SET, |
| RPM_MISC_REQ_TYPE, 0, &rpm_kvp, 1); |
| if (ret) { |
| pr_err("ddr-health: send nobuf to RPM failed %d, %x\n", |
| ret, mem_size); |
| goto err; |
| } |
| } |
| |
| if (old_addr) |
| kfree(phys_to_virt((phys_addr_t)old_addr)); |
| |
| mutex_unlock(&lock); |
| return 0; |
| err: |
| ddr_health->addr = old_addr; |
| ddr_health->size = old_size; |
| mutex_unlock(&lock); |
| return ret; |
| } |
| |
| static int __init ddr_health_init(void) |
| { |
| mutex_init(&lock); |
| |
| ddr_health = kzalloc(sizeof(*ddr_health), GFP_KERNEL); |
| if (!ddr_health) { |
| pr_err("ddr-health: failed to alloc mem\n"); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| module_init(ddr_health_init); |
| |
| static void __exit ddr_health_exit(void) |
| { |
| if (rpm_kvp.data) { |
| ddr_health = (struct ddr_health *)rpm_kvp.data; |
| |
| if (ddr_health->addr) |
| kfree(phys_to_virt((phys_addr_t)ddr_health->addr)); |
| } |
| |
| kfree(ddr_health); |
| mutex_destroy(&lock); |
| } |
| module_exit(ddr_health_exit); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("DDR health monitor driver"); |