Edward O'Callaghan | efc5841 | 2014-01-23 08:30:42 +1100 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the libpayload project. |
| 3 | * |
| 4 | * Copyright (C) 2012 secunet Security Networks AG |
| 5 | * Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com> |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 28 | * SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include <stdlib.h> |
| 32 | #include <stdint.h> |
| 33 | #include <string.h> |
| 34 | #include <libpayload.h> |
| 35 | #include <pci.h> |
| 36 | #include <storage/ata.h> |
| 37 | #include <storage/ahci.h> |
| 38 | |
| 39 | #include "ahci_private.h" |
| 40 | |
| 41 | |
| 42 | #ifdef DEBUG_STATUS |
| 43 | static inline u32 _ahci_clear_status(volatile u32 *const reg, |
| 44 | const char *const r, |
| 45 | const char *const f) |
| 46 | { |
| 47 | const u32 bits = *reg; |
| 48 | if (bits) |
| 49 | *reg = bits; |
| 50 | printf("ahci: %s: %s == 0x%08x\n", f, r, bits); |
| 51 | |
| 52 | return bits; |
| 53 | } |
| 54 | #define ahci_clear_status(p, r) _ahci_clear_status(&(p)->r, #r, __func__) |
| 55 | #else |
| 56 | static inline u32 _ahci_clear_status(volatile u32 *const reg) |
| 57 | { |
| 58 | const u32 bits = *reg; |
| 59 | if (bits) |
| 60 | *reg = bits; |
| 61 | return bits; |
| 62 | } |
| 63 | #define ahci_clear_status(p, r) _ahci_clear_status(&(p)->r) |
| 64 | #endif |
| 65 | |
| 66 | |
| 67 | /** Give a buffer with even address. */ |
| 68 | static u8 *ahci_prdbuf_init(ahci_dev_t *const dev, |
| 69 | u8 *const user_buf, const size_t len, |
| 70 | const int out) |
| 71 | { |
| 72 | if ((u32)user_buf & 1) { |
| 73 | printf("ahci: Odd buffer pointer (%p).\n", user_buf); |
| 74 | if (dev->buf) /* orphaned buffer */ |
| 75 | free((void *)dev->buf - *(dev->buf - 1)); |
| 76 | dev->buf = malloc(len + 2); |
| 77 | if (!dev->buf) |
| 78 | return NULL; |
| 79 | dev->user_buf = user_buf; |
| 80 | dev->write_back = !out; |
| 81 | dev->buflen = len; |
| 82 | if ((u32)dev->buf & 1) { |
| 83 | dev->buf[0] = 1; |
| 84 | dev->buf += 1; |
| 85 | } else { |
| 86 | dev->buf[0] = 1; |
| 87 | dev->buf[1] = 2; |
| 88 | dev->buf += 2; |
| 89 | } |
| 90 | if (out) |
| 91 | memcpy(dev->buf, user_buf, len); |
| 92 | return dev->buf; |
| 93 | } else { |
| 94 | return user_buf; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | static void ahci_prdbuf_finalize(ahci_dev_t *const dev) |
| 99 | { |
| 100 | if (dev->buf) { |
| 101 | if (dev->write_back) |
| 102 | memcpy(dev->user_buf, dev->buf, dev->buflen); |
| 103 | free((void *)dev->buf - *(dev->buf - 1)); |
| 104 | } |
| 105 | dev->buf = NULL; |
| 106 | dev->user_buf = NULL; |
| 107 | dev->write_back = 0; |
| 108 | dev->buflen = 0; |
| 109 | } |
| 110 | |
| 111 | int ahci_cmdengine_start(hba_port_t *const port) |
| 112 | { |
| 113 | /* CR has to be clear before starting the command engine. |
| 114 | This shouldn't take too long, but we should time out nevertheless. */ |
| 115 | int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */ |
| 116 | while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--) |
| 117 | udelay(1); |
| 118 | if (timeout < 0) { |
| 119 | printf("ahci: Timeout during start of command engine.\n"); |
| 120 | return 1; |
| 121 | } |
| 122 | |
| 123 | port->cmd_stat |= HBA_PxCMD_FRE; |
| 124 | port->cmd_stat |= HBA_PxCMD_ST; |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | int ahci_cmdengine_stop(hba_port_t *const port) |
| 129 | { |
| 130 | port->cmd_stat &= ~HBA_PxCMD_ST; |
| 131 | |
| 132 | /* Wait for the controller to clear CR. |
| 133 | This shouldn't take too long, but we should time out nevertheless. */ |
| 134 | int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */ |
| 135 | while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--) |
| 136 | udelay(1); |
| 137 | if (timeout < 0) { |
| 138 | printf("ahci: Timeout during stopping of command engine.\n"); |
| 139 | return 1; |
| 140 | } |
| 141 | |
| 142 | port->cmd_stat &= ~HBA_PxCMD_FRE; |
| 143 | |
| 144 | /* Wait for the controller to clear FR. |
| 145 | This shouldn't take too long, but we should time out nevertheless. */ |
| 146 | timeout = 1000; /* Time out after 1000 * 1us == 1ms. */ |
| 147 | while ((port->cmd_stat & HBA_PxCMD_FR) && timeout--) |
| 148 | udelay(1); |
| 149 | if (timeout < 0) { |
| 150 | printf("ahci: Timeout during stopping of command engine.\n"); |
| 151 | return 1; |
| 152 | } |
| 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | ssize_t ahci_cmdslot_exec(ahci_dev_t *const dev) |
| 158 | { |
| 159 | const int slotnum = 0; /* We always use the first slot. */ |
| 160 | |
| 161 | if (!(dev->port->cmd_stat & HBA_PxCMD_CR)) |
| 162 | return -1; |
| 163 | |
| 164 | /* Trigger command execution. */ |
| 165 | dev->port->cmd_issue |= (1 << slotnum); |
| 166 | |
| 167 | /* Wait for the controller to finish command execution. */ |
| 168 | int timeout = 50000; /* Time out after 50000 * 100us == 5s. */ |
| 169 | while ((dev->port->cmd_issue & (1 << slotnum)) && |
| 170 | !(dev->port->intr_status & HBA_PxIS_TFES) && |
| 171 | timeout--) |
| 172 | udelay(100); |
| 173 | if (timeout < 0) { |
| 174 | printf("ahci: Timeout during command execution.\n"); |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | ahci_prdbuf_finalize(dev); |
| 179 | |
| 180 | const u32 intr_status = ahci_clear_status(dev->port, intr_status); |
| 181 | if (intr_status & (HBA_PxIS_FATAL | HBA_PxIS_PCS)) { |
| 182 | ahci_error_recovery(dev, intr_status); |
| 183 | return -1; |
| 184 | } else { |
| 185 | return dev->cmdlist[slotnum].prd_bytes; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | size_t ahci_cmdslot_prepare(ahci_dev_t *const dev, |
| 190 | u8 *const user_buf, size_t buf_len, |
| 191 | const int out) |
| 192 | { |
| 193 | const int slotnum = 0; /* We always use the first slot. */ |
| 194 | |
| 195 | size_t read_count = 0; |
| 196 | |
| 197 | memset((void *)&dev->cmdlist[slotnum], |
| 198 | '\0', sizeof(dev->cmdlist[slotnum])); |
| 199 | memset((void *)dev->cmdtable, |
| 200 | '\0', sizeof(*dev->cmdtable)); |
| 201 | dev->cmdlist[slotnum].cmd = CMD_CFL(FIS_H2D_FIS_LEN); |
| 202 | dev->cmdlist[slotnum].cmdtable_base = virt_to_phys(dev->cmdtable); |
| 203 | |
| 204 | if (buf_len > 0) { |
| 205 | size_t prdt_len; |
| 206 | u8 *buf; |
| 207 | int i; |
| 208 | |
| 209 | prdt_len = ((buf_len - 1) >> BYTES_PER_PRD_SHIFT) + 1; |
| 210 | const size_t max_prdt_len = ARRAY_SIZE(dev->cmdtable->prdt); |
| 211 | if (prdt_len > max_prdt_len) { |
| 212 | prdt_len = max_prdt_len; |
| 213 | buf_len = prdt_len << BYTES_PER_PRD_SHIFT; |
| 214 | } |
| 215 | |
| 216 | dev->cmdlist[slotnum].prdt_length = prdt_len; |
| 217 | read_count = buf_len; |
| 218 | |
| 219 | buf = ahci_prdbuf_init(dev, user_buf, buf_len, out); |
| 220 | if (!buf) |
| 221 | return 0; |
| 222 | for (i = 0; i < prdt_len; ++i) { |
| 223 | const size_t bytes = |
| 224 | (buf_len < BYTES_PER_PRD) |
| 225 | ? buf_len : BYTES_PER_PRD; |
| 226 | dev->cmdtable->prdt[i].data_base = virt_to_phys(buf); |
| 227 | dev->cmdtable->prdt[i].flags = PRD_TABLE_BYTES(bytes); |
| 228 | buf_len -= bytes; |
| 229 | buf += bytes; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | return read_count; |
| 234 | } |
| 235 | |
| 236 | int ahci_identify_device(ata_dev_t *const ata_dev, u8 *const buf) |
| 237 | { |
| 238 | ahci_dev_t *const dev = (ahci_dev_t *)ata_dev; |
| 239 | |
| 240 | ahci_cmdslot_prepare(dev, buf, 512, 0); |
| 241 | |
| 242 | dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE; |
| 243 | dev->cmdtable->fis[1] = FIS_H2D_CMD; |
| 244 | dev->cmdtable->fis[2] = ata_dev->identify_cmd; |
| 245 | |
| 246 | if ((ahci_cmdslot_exec(dev) < 0) || (dev->cmdlist->prd_bytes != 512)) |
| 247 | return -1; |
| 248 | else |
| 249 | return 0; |
| 250 | } |