Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2005 Yinghai Lu <yinghailu@gmail.com> |
| 5 | * Copyright (C) 2009 coresystems GmbH |
| 6 | * Copyright (C) 2013 Vladimir Serbinenko |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; version 2 of the License. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | */ |
| 17 | |
| 18 | #include <arch/io.h> |
Kyösti Mälkki | b5d998b | 2017-08-20 21:36:08 +0300 | [diff] [blame] | 19 | #include <console/console.h> |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 20 | #include <device/smbus_def.h> |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 21 | #include <stdlib.h> |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 22 | #include "smbus.h" |
| 23 | |
| 24 | |
Kyösti Mälkki | b5d998b | 2017-08-20 21:36:08 +0300 | [diff] [blame] | 25 | #if IS_ENABLED(CONFIG_DEBUG_SMBUS) |
| 26 | #define dprintk(args...) printk(BIOS_DEBUG, ##args) |
| 27 | #else |
| 28 | #define dprintk(args...) do {} while (0) |
| 29 | #endif |
| 30 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 31 | /* I801 command constants */ |
| 32 | #define I801_QUICK (0 << 2) |
| 33 | #define I801_BYTE (1 << 2) |
| 34 | #define I801_BYTE_DATA (2 << 2) |
| 35 | #define I801_WORD_DATA (3 << 2) |
| 36 | #define I801_BLOCK_DATA (5 << 2) |
| 37 | #define I801_I2C_BLOCK_DATA (6 << 2) /* ICH5 and later */ |
| 38 | |
| 39 | /* I801 Host Control register bits */ |
| 40 | #define SMBHSTCNT_INTREN (1 << 0) |
| 41 | #define SMBHSTCNT_KILL (1 << 1) |
| 42 | #define SMBHSTCNT_LAST_BYTE (1 << 5) |
| 43 | #define SMBHSTCNT_START (1 << 6) |
| 44 | #define SMBHSTCNT_PEC_EN (1 << 7) /* ICH3 and later */ |
| 45 | |
| 46 | /* I801 Hosts Status register bits */ |
| 47 | #define SMBHSTSTS_BYTE_DONE (1 << 7) |
| 48 | #define SMBHSTSTS_INUSE_STS (1 << 6) |
| 49 | #define SMBHSTSTS_SMBALERT_STS (1 << 5) |
| 50 | #define SMBHSTSTS_FAILED (1 << 4) |
| 51 | #define SMBHSTSTS_BUS_ERR (1 << 3) |
| 52 | #define SMBHSTSTS_DEV_ERR (1 << 2) |
| 53 | #define SMBHSTSTS_INTR (1 << 1) |
| 54 | #define SMBHSTSTS_HOST_BUSY (1 << 0) |
| 55 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 56 | /* For SMBXMITADD register. */ |
| 57 | #define XMIT_WRITE(dev) (((dev) << 1) | 0) |
| 58 | #define XMIT_READ(dev) (((dev) << 1) | 1) |
| 59 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 60 | #define SMBUS_TIMEOUT (10 * 1000 * 100) |
Elyes HAOUAS | b0f1988 | 2018-06-09 11:59:00 +0200 | [diff] [blame] | 61 | #define SMBUS_BLOCK_MAXLEN 32 |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 62 | |
| 63 | static void smbus_delay(void) |
| 64 | { |
| 65 | inb(0x80); |
| 66 | } |
| 67 | |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 68 | static int host_completed(u8 status) |
| 69 | { |
| 70 | if (status & SMBHSTSTS_HOST_BUSY) |
| 71 | return 0; |
| 72 | status &= ~(SMBHSTSTS_SMBALERT_STS | SMBHSTSTS_INUSE_STS); |
| 73 | return status != 0; |
| 74 | } |
| 75 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 76 | static int recover_master(int smbus_base, int ret) |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 77 | { |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 78 | /* TODO: Depending of the failure, drive KILL transaction |
| 79 | * or force soft reset on SMBus master controller. |
| 80 | */ |
| 81 | printk(BIOS_ERR, "SMBus: Fatal master timeout (%d)\n", ret); |
| 82 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 83 | } |
| 84 | |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 85 | static int cb_err_from_stat(u8 status) |
| 86 | { |
| 87 | /* Ignore the "In Use" status... */ |
| 88 | status &= ~(SMBHSTSTS_SMBALERT_STS | SMBHSTSTS_INUSE_STS); |
| 89 | |
| 90 | if (status == SMBHSTSTS_INTR) |
| 91 | return 0; |
| 92 | |
| 93 | return SMBUS_ERROR; |
| 94 | } |
| 95 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 96 | static int setup_command(unsigned int smbus_base, u8 ctrl, u8 xmitadd) |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 97 | { |
| 98 | unsigned int loops = SMBUS_TIMEOUT; |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 99 | u8 host_busy; |
| 100 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 101 | do { |
| 102 | smbus_delay(); |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 103 | host_busy = inb(smbus_base + SMBHSTSTAT) & SMBHSTSTS_HOST_BUSY; |
| 104 | } while (--loops && host_busy); |
| 105 | |
| 106 | if (loops == 0) |
| 107 | return recover_master(smbus_base, |
| 108 | SMBUS_WAIT_UNTIL_READY_TIMEOUT); |
| 109 | |
| 110 | /* Clear any lingering errors, so the transaction will run. */ |
| 111 | outb(inb(smbus_base + SMBHSTSTAT), smbus_base + SMBHSTSTAT); |
| 112 | |
| 113 | /* Set up transaction */ |
| 114 | /* Disable interrupts */ |
| 115 | outb(ctrl, (smbus_base + SMBHSTCTL)); |
| 116 | |
| 117 | /* Set the device I'm talking to. */ |
| 118 | outb(xmitadd, smbus_base + SMBXMITADD); |
| 119 | |
| 120 | return 0; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 121 | } |
| 122 | |
Kyösti Mälkki | a2dcf73 | 2017-08-20 21:36:15 +0300 | [diff] [blame] | 123 | static int execute_command(unsigned int smbus_base) |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 124 | { |
Kyösti Mälkki | a2dcf73 | 2017-08-20 21:36:15 +0300 | [diff] [blame] | 125 | unsigned int loops = SMBUS_TIMEOUT; |
| 126 | u8 status; |
| 127 | |
| 128 | /* Start the command. */ |
| 129 | outb((inb(smbus_base + SMBHSTCTL) | SMBHSTCNT_START), |
| 130 | smbus_base + SMBHSTCTL); |
| 131 | |
| 132 | /* Poll for it to start. */ |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 133 | do { |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 134 | smbus_delay(); |
Kyösti Mälkki | a2dcf73 | 2017-08-20 21:36:15 +0300 | [diff] [blame] | 135 | |
| 136 | /* If we poll too slow, we could miss HOST_BUSY flag |
| 137 | * set and detect INTR or x_ERR flags instead here. |
| 138 | */ |
| 139 | status = inb(smbus_base + SMBHSTSTAT); |
| 140 | status &= ~(SMBHSTSTS_SMBALERT_STS | SMBHSTSTS_INUSE_STS); |
| 141 | } while (--loops && status == 0); |
| 142 | |
| 143 | if (loops == 0) |
| 144 | return recover_master(smbus_base, |
| 145 | SMBUS_WAIT_UNTIL_ACTIVE_TIMEOUT); |
| 146 | |
| 147 | return 0; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 148 | } |
| 149 | |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 150 | static int complete_command(unsigned int smbus_base) |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 151 | { |
| 152 | unsigned int loops = SMBUS_TIMEOUT; |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 153 | u8 status; |
| 154 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 155 | do { |
| 156 | smbus_delay(); |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 157 | status = inb(smbus_base + SMBHSTSTAT); |
| 158 | } while (--loops && !host_completed(status)); |
| 159 | |
| 160 | if (loops == 0) |
| 161 | return recover_master(smbus_base, |
| 162 | SMBUS_WAIT_UNTIL_DONE_TIMEOUT); |
| 163 | |
| 164 | return cb_err_from_stat(status); |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 165 | } |
| 166 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 167 | int do_smbus_read_byte(unsigned int smbus_base, u8 device, |
| 168 | unsigned int address) |
| 169 | { |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 170 | int ret; |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 171 | u8 byte; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 172 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 173 | /* Set up for a byte data read. */ |
| 174 | ret = setup_command(smbus_base, I801_BYTE_DATA, XMIT_READ(device)); |
| 175 | if (ret < 0) |
| 176 | return ret; |
| 177 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 178 | /* Set the command/address... */ |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 179 | outb(address, smbus_base + SMBHSTCMD); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 180 | |
| 181 | /* Clear the data byte... */ |
| 182 | outb(0, smbus_base + SMBHSTDAT0); |
| 183 | |
| 184 | /* Start the command */ |
Kyösti Mälkki | a2dcf73 | 2017-08-20 21:36:15 +0300 | [diff] [blame] | 185 | ret = execute_command(smbus_base); |
| 186 | if (ret < 0) |
| 187 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 188 | |
| 189 | /* Poll for transaction completion */ |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 190 | ret = complete_command(smbus_base); |
| 191 | if (ret < 0) |
| 192 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 193 | |
| 194 | /* Read results of transaction */ |
| 195 | byte = inb(smbus_base + SMBHSTDAT0); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 196 | return byte; |
| 197 | } |
| 198 | |
| 199 | int do_smbus_write_byte(unsigned int smbus_base, u8 device, |
| 200 | unsigned int address, unsigned int data) |
| 201 | { |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 202 | int ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 203 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 204 | /* Set up for a byte data write. */ |
| 205 | ret = setup_command(smbus_base, I801_BYTE_DATA, XMIT_WRITE(device)); |
| 206 | if (ret < 0) |
| 207 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 208 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 209 | /* Set the command/address... */ |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 210 | outb(address, smbus_base + SMBHSTCMD); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 211 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 212 | /* Set the data byte... */ |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 213 | outb(data, smbus_base + SMBHSTDAT0); |
| 214 | |
| 215 | /* Start the command */ |
Kyösti Mälkki | a2dcf73 | 2017-08-20 21:36:15 +0300 | [diff] [blame] | 216 | ret = execute_command(smbus_base); |
| 217 | if (ret < 0) |
| 218 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 219 | |
| 220 | /* Poll for transaction completion */ |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 221 | return complete_command(smbus_base); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | int do_smbus_block_read(unsigned int smbus_base, u8 device, u8 cmd, |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 225 | unsigned int max_bytes, u8 *buf) |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 226 | { |
| 227 | u8 status; |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 228 | int ret, slave_bytes; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 229 | int bytes_read = 0; |
| 230 | unsigned int loops = SMBUS_TIMEOUT; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 231 | |
Kyösti Mälkki | c17e855 | 2017-08-20 23:48:23 +0300 | [diff] [blame] | 232 | max_bytes = MIN(SMBUS_BLOCK_MAXLEN, max_bytes); |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 233 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 234 | /* Set up for a block data read. */ |
| 235 | ret = setup_command(smbus_base, I801_BLOCK_DATA, XMIT_READ(device)); |
| 236 | if (ret < 0) |
| 237 | return ret; |
| 238 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 239 | /* Set the command/address... */ |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 240 | outb(cmd, smbus_base + SMBHSTCMD); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 241 | |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 242 | /* Reset number of bytes to transfer so we notice later it |
| 243 | * was really updated with the transaction. */ |
| 244 | outb(0, smbus_base + SMBHSTDAT0); |
| 245 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 246 | /* Start the command */ |
Kyösti Mälkki | a2dcf73 | 2017-08-20 21:36:15 +0300 | [diff] [blame] | 247 | ret = execute_command(smbus_base); |
| 248 | if (ret < 0) |
| 249 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 250 | |
| 251 | /* Poll for transaction completion */ |
| 252 | do { |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 253 | status = inb(smbus_base + SMBHSTSTAT); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 254 | |
| 255 | if (status & SMBHSTSTS_BYTE_DONE) { /* Byte done */ |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 256 | |
| 257 | if (bytes_read < max_bytes) { |
Kyösti Mälkki | c17e855 | 2017-08-20 23:48:23 +0300 | [diff] [blame] | 258 | *buf++ = inb(smbus_base + SMBBLKDAT); |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 259 | bytes_read++; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 260 | } |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 261 | |
| 262 | /* Engine internally completes the transaction |
| 263 | * and clears HOST_BUSY flag once the byte count |
| 264 | * from slave is reached. |
| 265 | */ |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 266 | outb(SMBHSTSTS_BYTE_DONE, smbus_base + SMBHSTSTAT); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 267 | } |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 268 | } while (--loops && !host_completed(status)); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 269 | |
Kyösti Mälkki | f51c5fd | 2017-09-09 20:45:47 +0300 | [diff] [blame] | 270 | /* Post-check we received complete message. */ |
| 271 | slave_bytes = inb(smbus_base + SMBHSTDAT0); |
| 272 | |
Kyösti Mälkki | b5d998b | 2017-08-20 21:36:08 +0300 | [diff] [blame] | 273 | dprintk("%s: status = %02x, len = %d / %d, loops = %d\n", |
| 274 | __func__, status, bytes_read, slave_bytes, loops); |
| 275 | |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 276 | if (loops == 0) |
| 277 | return recover_master(smbus_base, |
| 278 | SMBUS_WAIT_UNTIL_DONE_TIMEOUT); |
| 279 | |
| 280 | ret = cb_err_from_stat(status); |
| 281 | if (ret < 0) |
| 282 | return ret; |
| 283 | |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 284 | if (bytes_read < slave_bytes) |
| 285 | return SMBUS_ERROR; |
| 286 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 287 | return bytes_read; |
| 288 | } |
| 289 | |
| 290 | int do_smbus_block_write(unsigned int smbus_base, u8 device, u8 cmd, |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 291 | const unsigned int bytes, const u8 *buf) |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 292 | { |
| 293 | u8 status; |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 294 | int ret, bytes_sent = 0; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 295 | unsigned int loops = SMBUS_TIMEOUT; |
| 296 | |
Kyösti Mälkki | c17e855 | 2017-08-20 23:48:23 +0300 | [diff] [blame] | 297 | if (bytes > SMBUS_BLOCK_MAXLEN) |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 298 | return SMBUS_ERROR; |
| 299 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 300 | /* Set up for a block data write. */ |
| 301 | ret = setup_command(smbus_base, I801_BLOCK_DATA, XMIT_WRITE(device)); |
| 302 | if (ret < 0) |
| 303 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 304 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 305 | /* Set the command/address... */ |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 306 | outb(cmd, smbus_base + SMBHSTCMD); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 307 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 308 | /* Set number of bytes to transfer. */ |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 309 | outb(bytes, smbus_base + SMBHSTDAT0); |
| 310 | |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 311 | /* Send first byte from buffer, bytes_sent increments after |
| 312 | * hardware acknowledges it. |
| 313 | */ |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 314 | outb(*buf++, smbus_base + SMBBLKDAT); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 315 | |
| 316 | /* Start the command */ |
Kyösti Mälkki | a2dcf73 | 2017-08-20 21:36:15 +0300 | [diff] [blame] | 317 | ret = execute_command(smbus_base); |
| 318 | if (ret < 0) |
| 319 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 320 | |
| 321 | /* Poll for transaction completion */ |
| 322 | do { |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 323 | status = inb(smbus_base + SMBHSTSTAT); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 324 | |
| 325 | if (status & SMBHSTSTS_BYTE_DONE) { |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 326 | bytes_sent++; |
| 327 | if (bytes_sent < bytes) |
| 328 | outb(*buf++, smbus_base + SMBBLKDAT); |
| 329 | |
| 330 | /* Engine internally completes the transaction |
| 331 | * and clears HOST_BUSY flag once the byte count |
| 332 | * has been reached. |
| 333 | */ |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 334 | outb(SMBHSTSTS_BYTE_DONE, smbus_base + SMBHSTSTAT); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 335 | } |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 336 | } while (--loops && !host_completed(status)); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 337 | |
Kyösti Mälkki | b5d998b | 2017-08-20 21:36:08 +0300 | [diff] [blame] | 338 | dprintk("%s: status = %02x, len = %d / %d, loops = %d\n", |
| 339 | __func__, status, bytes_sent, bytes, loops); |
| 340 | |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 341 | if (loops == 0) |
| 342 | return recover_master(smbus_base, |
| 343 | SMBUS_WAIT_UNTIL_DONE_TIMEOUT); |
| 344 | |
| 345 | ret = cb_err_from_stat(status); |
| 346 | if (ret < 0) |
| 347 | return ret; |
| 348 | |
Kyösti Mälkki | c17e855 | 2017-08-20 23:48:23 +0300 | [diff] [blame] | 349 | if (bytes_sent < bytes) |
| 350 | return SMBUS_ERROR; |
| 351 | |
Arthur Heymans | 1b04aa2 | 2017-08-04 14:28:50 +0200 | [diff] [blame] | 352 | return bytes_sent; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | /* Only since ICH5 */ |
| 356 | int do_i2c_block_read(unsigned int smbus_base, u8 device, |
Kyösti Mälkki | 1e39236 | 2017-08-20 21:36:03 +0300 | [diff] [blame] | 357 | unsigned int offset, const unsigned int bytes, u8 *buf) |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 358 | { |
| 359 | u8 status; |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 360 | int ret, bytes_read = 0; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 361 | unsigned int loops = SMBUS_TIMEOUT; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 362 | |
Kyösti Mälkki | 957511c | 2017-08-20 21:36:11 +0300 | [diff] [blame] | 363 | /* Set up for a i2c block data read. |
| 364 | * |
| 365 | * FIXME: Address parameter changes to XMIT_READ(device) with |
| 366 | * some revision of PCH. Presumably hardware revisions that |
| 367 | * do not have i2c block write support internally set LSB. |
| 368 | */ |
| 369 | ret = setup_command(smbus_base, I801_I2C_BLOCK_DATA, |
| 370 | XMIT_WRITE(device)); |
| 371 | if (ret < 0) |
| 372 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 373 | |
| 374 | /* device offset */ |
| 375 | outb(offset, smbus_base + SMBHSTDAT1); |
| 376 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 377 | /* Start the command */ |
Kyösti Mälkki | a2dcf73 | 2017-08-20 21:36:15 +0300 | [diff] [blame] | 378 | ret = execute_command(smbus_base); |
| 379 | if (ret < 0) |
| 380 | return ret; |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 381 | |
| 382 | /* Poll for transaction completion */ |
| 383 | do { |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 384 | status = inb(smbus_base + SMBHSTSTAT); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 385 | |
| 386 | if (status & SMBHSTSTS_BYTE_DONE) { |
Kyösti Mälkki | 1e39236 | 2017-08-20 21:36:03 +0300 | [diff] [blame] | 387 | |
| 388 | if (bytes_read < bytes) { |
| 389 | *buf++ = inb(smbus_base + SMBBLKDAT); |
| 390 | bytes_read++; |
| 391 | } |
| 392 | |
| 393 | if (bytes_read + 1 >= bytes) { |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 394 | /* indicate that next byte is the last one */ |
| 395 | outb(inb(smbus_base + SMBHSTCTL) |
| 396 | | SMBHSTCNT_LAST_BYTE, |
| 397 | smbus_base + SMBHSTCTL); |
| 398 | } |
Kyösti Mälkki | 1e39236 | 2017-08-20 21:36:03 +0300 | [diff] [blame] | 399 | |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 400 | outb(SMBHSTSTS_BYTE_DONE, smbus_base + SMBHSTSTAT); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 401 | } |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 402 | } while (--loops && !host_completed(status)); |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 403 | |
Kyösti Mälkki | b5d998b | 2017-08-20 21:36:08 +0300 | [diff] [blame] | 404 | dprintk("%s: status = %02x, len = %d / %d, loops = %d\n", |
| 405 | __func__, status, bytes_read, bytes, loops); |
| 406 | |
Kyösti Mälkki | c38d543 | 2017-08-20 21:36:18 +0300 | [diff] [blame^] | 407 | if (loops == 0) |
| 408 | return recover_master(smbus_base, |
| 409 | SMBUS_WAIT_UNTIL_DONE_TIMEOUT); |
| 410 | |
| 411 | ret = cb_err_from_stat(status); |
| 412 | if (ret < 0) |
| 413 | return ret; |
| 414 | |
Kyösti Mälkki | 1e39236 | 2017-08-20 21:36:03 +0300 | [diff] [blame] | 415 | if (bytes_read < bytes) |
| 416 | return SMBUS_ERROR; |
| 417 | |
Arthur Heymans | 16fe790 | 2017-04-12 17:01:31 +0200 | [diff] [blame] | 418 | return bytes_read; |
| 419 | } |