Andrew Jeffery | 1e531af | 2018-08-07 13:32:57 +0930 | [diff] [blame] | 1 | // SPDX-License-Identifier: Apache-2.0 |
| 2 | // Copyright (C) 2018 IBM Corp. |
| 3 | #include "config.h" |
| 4 | |
| 5 | #include <errno.h> |
| 6 | #include <stdint.h> |
| 7 | |
| 8 | #include "mbox.h" |
| 9 | #include "lpc.h" |
| 10 | #include "transport_mbox.h" /* TODO: Remove dependency on transport_mbox.h */ |
| 11 | #include "windows.h" |
| 12 | |
Andrew Jeffery | ab666a5 | 2018-08-07 14:28:09 +0930 | [diff] [blame] | 13 | int protocol_v1_reset(struct mbox_context *context) |
| 14 | { |
| 15 | /* Host requested it -> No BMC Event */ |
| 16 | windows_reset_all(context, NO_BMC_EVENT); |
| 17 | return lpc_reset(context); |
| 18 | } |
| 19 | |
Andrew Jeffery | 1e531af | 2018-08-07 13:32:57 +0930 | [diff] [blame] | 20 | int protocol_v1_get_info(struct mbox_context *context, |
| 21 | struct protocol_get_info *io) |
| 22 | { |
| 23 | uint8_t old_version = context->version; |
| 24 | int rc; |
| 25 | |
| 26 | /* Bootstrap protocol version. This may involve {up,down}grading */ |
| 27 | rc = protocol_negotiate_version(context, io->req.api_version); |
| 28 | if (rc < 0) |
| 29 | return rc; |
| 30 | |
| 31 | /* Do the {up,down}grade if necessary*/ |
| 32 | if (rc != old_version) { |
| 33 | windows_reset_all(context, SET_BMC_EVENT); |
| 34 | return context->protocol->get_info(context, io); |
| 35 | } |
| 36 | |
| 37 | /* Record the negotiated version for the response */ |
| 38 | io->resp.api_version = rc; |
| 39 | |
| 40 | /* Now do all required intialisation for v1 */ |
| 41 | context->block_size_shift = BLOCK_SIZE_SHIFT_V1; |
| 42 | MSG_INFO("Block Size: 0x%.8x (shift: %u)\n", |
| 43 | 1 << context->block_size_shift, context->block_size_shift); |
| 44 | |
| 45 | /* Knowing blocksize we can allocate the window dirty_bytemap */ |
| 46 | windows_alloc_dirty_bytemap(context); |
| 47 | |
| 48 | io->resp.v1.read_window_size = |
| 49 | context->windows.default_size >> context->block_size_shift; |
| 50 | io->resp.v1.write_window_size = |
| 51 | context->windows.default_size >> context->block_size_shift; |
| 52 | |
| 53 | return lpc_map_memory(context); |
| 54 | } |
| 55 | |
Andrew Jeffery | 91a8745 | 2018-08-07 14:54:14 +0930 | [diff] [blame^] | 56 | int protocol_v1_get_flash_info(struct mbox_context *context, |
| 57 | struct protocol_get_flash_info *io) |
| 58 | { |
| 59 | io->resp.v1.flash_size = context->flash_size; |
| 60 | io->resp.v1.erase_size = context->mtd_info.erasesize; |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
Andrew Jeffery | 1e531af | 2018-08-07 13:32:57 +0930 | [diff] [blame] | 65 | /* |
| 66 | * get_suggested_timeout() - get the suggested timeout value in seconds |
| 67 | * @context: The mbox context pointer |
| 68 | * |
| 69 | * Return: Suggested timeout in seconds |
| 70 | */ |
| 71 | static uint16_t get_suggested_timeout(struct mbox_context *context) |
| 72 | { |
| 73 | struct window_context *window = windows_find_largest(context); |
| 74 | uint32_t max_size_mb = window ? (window->size >> 20) : 0; |
| 75 | uint16_t ret; |
| 76 | |
| 77 | ret = align_up(max_size_mb * FLASH_ACCESS_MS_PER_MB, 1000) / 1000; |
| 78 | |
| 79 | MSG_DBG("Suggested Timeout: %us, max window size: %uMB, for %dms/MB\n", |
| 80 | ret, max_size_mb, FLASH_ACCESS_MS_PER_MB); |
| 81 | return ret; |
| 82 | } |
| 83 | |
| 84 | int protocol_v2_get_info(struct mbox_context *context, |
| 85 | struct protocol_get_info *io) |
| 86 | { |
| 87 | uint8_t old_version = context->version; |
| 88 | int rc; |
| 89 | |
| 90 | /* Bootstrap protocol version. This may involve {up,down}grading */ |
| 91 | rc = protocol_negotiate_version(context, io->req.api_version); |
| 92 | if (rc < 0) |
| 93 | return rc; |
| 94 | |
| 95 | /* Do the {up,down}grade if necessary*/ |
| 96 | if (rc != old_version) { |
| 97 | windows_reset_all(context, SET_BMC_EVENT); |
| 98 | return context->protocol->get_info(context, io); |
| 99 | } |
| 100 | |
| 101 | /* Record the negotiated version for the response */ |
| 102 | io->resp.api_version = rc; |
| 103 | |
| 104 | /* Now do all required intialisation for v2 */ |
| 105 | context->block_size_shift = log_2(context->mtd_info.erasesize); |
| 106 | MSG_INFO("Block Size: 0x%.8x (shift: %u)\n", |
| 107 | 1 << context->block_size_shift, context->block_size_shift); |
| 108 | |
| 109 | /* Knowing blocksize we can allocate the window dirty_bytemap */ |
| 110 | windows_alloc_dirty_bytemap(context); |
| 111 | |
| 112 | io->resp.v2.block_size_shift = context->block_size_shift; |
| 113 | io->resp.v2.timeout = get_suggested_timeout(context); |
| 114 | |
| 115 | return lpc_map_memory(context); |
| 116 | } |
| 117 | |
Andrew Jeffery | 91a8745 | 2018-08-07 14:54:14 +0930 | [diff] [blame^] | 118 | int protocol_v2_get_flash_info(struct mbox_context *context, |
| 119 | struct protocol_get_flash_info *io) |
| 120 | { |
| 121 | io->resp.v2.flash_size = |
| 122 | context->flash_size >> context->block_size_shift; |
| 123 | io->resp.v2.erase_size = |
| 124 | context->mtd_info.erasesize >> context->block_size_shift; |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | |
Andrew Jeffery | 1e531af | 2018-08-07 13:32:57 +0930 | [diff] [blame] | 129 | static const struct protocol_ops protocol_ops_v1 = { |
Andrew Jeffery | ab666a5 | 2018-08-07 14:28:09 +0930 | [diff] [blame] | 130 | .reset = protocol_v1_reset, |
Andrew Jeffery | 1e531af | 2018-08-07 13:32:57 +0930 | [diff] [blame] | 131 | .get_info = protocol_v1_get_info, |
Andrew Jeffery | 91a8745 | 2018-08-07 14:54:14 +0930 | [diff] [blame^] | 132 | .get_flash_info = protocol_v1_get_flash_info, |
Andrew Jeffery | 1e531af | 2018-08-07 13:32:57 +0930 | [diff] [blame] | 133 | }; |
| 134 | |
| 135 | static const struct protocol_ops protocol_ops_v2 = { |
Andrew Jeffery | ab666a5 | 2018-08-07 14:28:09 +0930 | [diff] [blame] | 136 | .reset = protocol_v1_reset, |
Andrew Jeffery | 1e531af | 2018-08-07 13:32:57 +0930 | [diff] [blame] | 137 | .get_info = protocol_v2_get_info, |
Andrew Jeffery | 91a8745 | 2018-08-07 14:54:14 +0930 | [diff] [blame^] | 138 | .get_flash_info = protocol_v2_get_flash_info, |
Andrew Jeffery | 1e531af | 2018-08-07 13:32:57 +0930 | [diff] [blame] | 139 | }; |
| 140 | |
| 141 | static const struct protocol_ops *protocol_ops_map[] = { |
| 142 | [0] = NULL, |
| 143 | [1] = &protocol_ops_v1, |
| 144 | [2] = &protocol_ops_v2, |
| 145 | }; |
| 146 | |
| 147 | int protocol_negotiate_version(struct mbox_context *context, |
| 148 | uint8_t requested) |
| 149 | { |
| 150 | /* Check we support the version requested */ |
| 151 | if (requested < API_MIN_VERSION) |
| 152 | return -EINVAL; |
| 153 | |
| 154 | context->version = (requested > API_MAX_VERSION) ? |
| 155 | API_MAX_VERSION : requested; |
| 156 | |
| 157 | context->protocol = protocol_ops_map[context->version]; |
| 158 | |
| 159 | return context->version; |
| 160 | } |
| 161 | |
| 162 | int protocol_init(struct mbox_context *context) |
| 163 | { |
| 164 | context->version = API_MAX_VERSION; |
| 165 | context->protocol = protocol_ops_map[context->version]; |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | void protocol_free(struct mbox_context *context) |
| 171 | { |
| 172 | return; |
| 173 | } |