| Borjan Tchakaloff | 37ad1d3 | 2018-02-16 18:27:16 +0100 | [diff] [blame] | 1 | /* linux/arch/arm/mach-msm/msm_ddr_sysctl.c |
| 2 | * |
| 3 | * Copyright 2017-2018 Fairphone B.V. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 and |
| 7 | * only version 2 as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/sysctl.h> |
| 18 | #include <mach/msm_smem.h> |
| 19 | #include "smem_private.h" |
| 20 | |
| 21 | |
| 22 | /* DDR vendor identifiers (64-bits unsigned integer) */ |
| 23 | enum { |
| 24 | DDR_VENDOR_ID_INVALID = -1, |
| 25 | DDR_VENDOR_ID_SAMSUNG = 1, |
| 26 | DDR_VENDOR_ID_MICRON = 255, |
| 27 | }; |
| 28 | |
| 29 | /* Maximum DDR vendor name length */ |
| 30 | #define DDR_VENDOR_NAME_MAX_LEN 32 |
| 31 | |
| 32 | /* DDR vendor names (shorter than DDR_VENDOR_NAME_MAX_LEN) */ |
| 33 | char *DDR_VENDOR_NAME_MICRON = "Micron"; |
| 34 | char *DDR_VENDOR_NAME_SAMSUNG = "Samsung"; |
| 35 | char *DDR_VENDOR_NAME_UNKNOWN = "Unknown"; |
| 36 | |
| 37 | static char ddr_vendor[DDR_VENDOR_NAME_MAX_LEN] = ""; |
| 38 | |
| 39 | static struct ctl_table_header *ddr_table_header; |
| 40 | |
| 41 | static ctl_table ddr_vendor_table[] = { |
| 42 | { |
| 43 | .procname = "vendor", |
| 44 | .data = ddr_vendor, |
| 45 | .maxlen = DDR_VENDOR_NAME_MAX_LEN, |
| 46 | .mode = 0444, |
| 47 | .proc_handler = proc_dostring, |
| 48 | }, |
| 49 | {} |
| 50 | }; |
| 51 | |
| 52 | static ctl_table ddr_dir_table[] = { |
| 53 | { |
| 54 | .procname = "ddr", |
| 55 | .mode = 0555, |
| 56 | .child = ddr_vendor_table, |
| 57 | }, |
| 58 | {} |
| 59 | }; |
| 60 | |
| 61 | static ctl_table dev_root_table[] = { |
| 62 | { |
| 63 | .procname = "dev", |
| 64 | .mode = 0555, |
| 65 | .child = ddr_dir_table, |
| 66 | }, |
| 67 | {} |
| 68 | }; |
| 69 | |
| 70 | |
| 71 | static int get_ddr_vendor_id_from_smem(void) { |
| 72 | unsigned int smem_size; |
| 73 | unsigned int *smem_ddr_vendor_id; |
| 74 | |
| 75 | smem_ddr_vendor_id = smem_get_entry(SMEM_DDR_VENDOR_ID, &smem_size); |
| 76 | if (smem_ddr_vendor_id == NULL) { |
| 77 | printk("Could not get the DDR vendor identifier from SMEM\n"); |
| 78 | return DDR_VENDOR_ID_INVALID; |
| 79 | } |
| 80 | |
| 81 | return (int) *smem_ddr_vendor_id; |
| 82 | } |
| 83 | |
| 84 | static int __init msm_ddr_init(void) { |
| 85 | switch (get_ddr_vendor_id_from_smem()) { |
| 86 | case DDR_VENDOR_ID_MICRON: |
| 87 | strncpy(ddr_vendor, DDR_VENDOR_NAME_MICRON, DDR_VENDOR_NAME_MAX_LEN); |
| 88 | break; |
| 89 | case DDR_VENDOR_ID_SAMSUNG: |
| 90 | strncpy(ddr_vendor, DDR_VENDOR_NAME_SAMSUNG, DDR_VENDOR_NAME_MAX_LEN); |
| 91 | break; |
| 92 | case DDR_VENDOR_ID_INVALID: |
| 93 | default: |
| 94 | strncpy(ddr_vendor, DDR_VENDOR_NAME_UNKNOWN, DDR_VENDOR_NAME_MAX_LEN); |
| 95 | break; |
| 96 | } |
| 97 | ddr_vendor[DDR_VENDOR_NAME_MAX_LEN-1] = '\0'; |
| 98 | |
| 99 | ddr_table_header = register_sysctl_table(dev_root_table); |
| 100 | if (!ddr_table_header) |
| 101 | return -ENOMEM; |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | static void __exit msm_ddr_exit(void) { |
| 107 | unregister_sysctl_table(ddr_table_header); |
| 108 | } |
| 109 | |
| 110 | module_init(msm_ddr_init); |
| 111 | module_exit(msm_ddr_exit); |
| 112 | MODULE_LICENSE("GPL"); |
| 113 | MODULE_DESCRIPTION("DDR information"); |