Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 2 | * Copyright (c) 2000 Frodo Looijaard <frodol@dds.nl>, |
| 3 | * Philip Edelbrock <phil@netroedge.com>, |
| 4 | * Mark D. Studebaker <mdsxyz123@yahoo.com>, |
| 5 | * Dan Eaton <dan.eaton@rocketlogix.com> and |
| 6 | * Stephen Rousset <stephen.rousset@rocketlogix.com> |
| 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; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | */ |
| 22 | |
| 23 | /* |
| 24 | This is the driver for the SMB Host controller on |
| 25 | Acer Labs Inc. (ALI) M1535 South Bridge. |
| 26 | |
| 27 | The M1535 is a South bridge for portable systems. |
| 28 | It is very similar to the M15x3 South bridges also produced |
| 29 | by Acer Labs Inc. Some of the registers within the part |
| 30 | have moved and some have been redefined slightly. Additionally, |
| 31 | the sequencing of the SMBus transactions has been modified |
| 32 | to be more consistent with the sequencing recommended by |
| 33 | the manufacturer and observed through testing. These |
| 34 | changes are reflected in this driver and can be identified |
| 35 | by comparing this driver to the i2c-ali15x3 driver. |
| 36 | For an overview of these chips see http://www.acerlabs.com |
| 37 | |
| 38 | The SMB controller is part of the 7101 device, which is an |
| 39 | ACPI-compliant Power Management Unit (PMU). |
| 40 | |
| 41 | The whole 7101 device has to be enabled for the SMB to work. |
| 42 | You can't just enable the SMB alone. |
| 43 | The SMB and the ACPI have separate I/O spaces. |
| 44 | We make sure that the SMB is enabled. We leave the ACPI alone. |
| 45 | |
| 46 | This driver controls the SMB Host only. |
| 47 | |
| 48 | This driver does not use interrupts. |
| 49 | */ |
| 50 | |
| 51 | |
| 52 | /* Note: we assume there can only be one ALI1535, with one SMBus interface */ |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <linux/module.h> |
| 55 | #include <linux/pci.h> |
| 56 | #include <linux/kernel.h> |
| 57 | #include <linux/stddef.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <linux/delay.h> |
| 59 | #include <linux/ioport.h> |
| 60 | #include <linux/i2c.h> |
| 61 | #include <linux/init.h> |
Jean Delvare | 54fb4a05 | 2008-07-14 22:38:33 +0200 | [diff] [blame] | 62 | #include <linux/acpi.h> |
H Hartley Sweeten | 2178218 | 2010-05-21 18:41:01 +0200 | [diff] [blame] | 63 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
| 65 | |
| 66 | /* ALI1535 SMBus address offsets */ |
| 67 | #define SMBHSTSTS (0 + ali1535_smba) |
| 68 | #define SMBHSTTYP (1 + ali1535_smba) |
| 69 | #define SMBHSTPORT (2 + ali1535_smba) |
| 70 | #define SMBHSTCMD (7 + ali1535_smba) |
| 71 | #define SMBHSTADD (3 + ali1535_smba) |
| 72 | #define SMBHSTDAT0 (4 + ali1535_smba) |
| 73 | #define SMBHSTDAT1 (5 + ali1535_smba) |
| 74 | #define SMBBLKDAT (6 + ali1535_smba) |
| 75 | |
| 76 | /* PCI Address Constants */ |
| 77 | #define SMBCOM 0x004 |
| 78 | #define SMBREV 0x008 |
| 79 | #define SMBCFG 0x0D1 |
| 80 | #define SMBBA 0x0E2 |
| 81 | #define SMBHSTCFG 0x0F0 |
| 82 | #define SMBCLK 0x0F2 |
| 83 | |
| 84 | /* Other settings */ |
| 85 | #define MAX_TIMEOUT 500 /* times 1/100 sec */ |
| 86 | #define ALI1535_SMB_IOSIZE 32 |
| 87 | |
| 88 | #define ALI1535_SMB_DEFAULTBASE 0x8040 |
| 89 | |
| 90 | /* ALI1535 address lock bits */ |
| 91 | #define ALI1535_LOCK 0x06 /* dwe */ |
| 92 | |
| 93 | /* ALI1535 command constants */ |
| 94 | #define ALI1535_QUICK 0x00 |
| 95 | #define ALI1535_BYTE 0x10 |
| 96 | #define ALI1535_BYTE_DATA 0x20 |
| 97 | #define ALI1535_WORD_DATA 0x30 |
| 98 | #define ALI1535_BLOCK_DATA 0x40 |
| 99 | #define ALI1535_I2C_READ 0x60 |
| 100 | |
| 101 | #define ALI1535_DEV10B_EN 0x80 /* Enable 10-bit addressing in */ |
| 102 | /* I2C read */ |
| 103 | #define ALI1535_T_OUT 0x08 /* Time-out Command (write) */ |
| 104 | #define ALI1535_A_HIGH_BIT9 0x08 /* Bit 9 of 10-bit address in */ |
| 105 | /* Alert-Response-Address */ |
| 106 | /* (read) */ |
| 107 | #define ALI1535_KILL 0x04 /* Kill Command (write) */ |
| 108 | #define ALI1535_A_HIGH_BIT8 0x04 /* Bit 8 of 10-bit address in */ |
| 109 | /* Alert-Response-Address */ |
| 110 | /* (read) */ |
| 111 | |
| 112 | #define ALI1535_D_HI_MASK 0x03 /* Mask for isolating bits 9-8 */ |
| 113 | /* of 10-bit address in I2C */ |
| 114 | /* Read Command */ |
| 115 | |
| 116 | /* ALI1535 status register bits */ |
| 117 | #define ALI1535_STS_IDLE 0x04 |
| 118 | #define ALI1535_STS_BUSY 0x08 /* host busy */ |
| 119 | #define ALI1535_STS_DONE 0x10 /* transaction complete */ |
| 120 | #define ALI1535_STS_DEV 0x20 /* device error */ |
| 121 | #define ALI1535_STS_BUSERR 0x40 /* bus error */ |
| 122 | #define ALI1535_STS_FAIL 0x80 /* failed bus transaction */ |
| 123 | #define ALI1535_STS_ERR 0xE0 /* all the bad error bits */ |
| 124 | |
| 125 | #define ALI1535_BLOCK_CLR 0x04 /* reset block data index */ |
| 126 | |
| 127 | /* ALI1535 device address register bits */ |
| 128 | #define ALI1535_RD_ADDR 0x01 /* Read/Write Bit in Device */ |
| 129 | /* Address field */ |
| 130 | /* -> Write = 0 */ |
| 131 | /* -> Read = 1 */ |
| 132 | #define ALI1535_SMBIO_EN 0x04 /* SMB I/O Space enable */ |
| 133 | |
Jean Delvare | d6072f8 | 2005-09-25 16:37:04 +0200 | [diff] [blame] | 134 | static struct pci_driver ali1535_driver; |
corentin.labbe | 65a2d74 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 135 | static unsigned long ali1535_smba; |
| 136 | static unsigned short ali1535_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
| 138 | /* Detect whether a ALI1535 can be found, and initialize it, where necessary. |
| 139 | Note the differences between kernels with the old PCI BIOS interface and |
| 140 | newer kernels with the real PCI interface. In compat.h some things are |
| 141 | defined to make the transition easier. */ |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 142 | static int ali1535_setup(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
Jean Delvare | 7c1f59c | 2012-01-12 20:32:03 +0100 | [diff] [blame] | 144 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | unsigned char temp; |
| 146 | |
| 147 | /* Check the following things: |
| 148 | - SMB I/O address is initialized |
| 149 | - Device is enabled |
| 150 | - We can use the addresses |
| 151 | */ |
| 152 | |
corentin.labbe | 65a2d74 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 153 | retval = pci_enable_device(dev); |
| 154 | if (retval) { |
| 155 | dev_err(&dev->dev, "ALI1535_smb can't enable device\n"); |
| 156 | goto exit; |
| 157 | } |
| 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | /* Determine the address of the SMBus area */ |
corentin.labbe | 65a2d74 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 160 | pci_read_config_word(dev, SMBBA, &ali1535_offset); |
| 161 | dev_dbg(&dev->dev, "ALI1535_smb is at offset 0x%04x\n", ali1535_offset); |
| 162 | ali1535_offset &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1)); |
| 163 | if (ali1535_offset == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | dev_warn(&dev->dev, |
| 165 | "ALI1535_smb region uninitialized - upgrade BIOS?\n"); |
Jean Delvare | 7c1f59c | 2012-01-12 20:32:03 +0100 | [diff] [blame] | 166 | retval = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | goto exit; |
| 168 | } |
| 169 | |
corentin.labbe | 65a2d74 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 170 | if (pci_resource_flags(dev, 0) & IORESOURCE_IO) |
| 171 | ali1535_smba = pci_resource_start(dev, 0) + ali1535_offset; |
| 172 | else |
| 173 | ali1535_smba = ali1535_offset; |
| 174 | |
Jean Delvare | 54fb4a05 | 2008-07-14 22:38:33 +0200 | [diff] [blame] | 175 | retval = acpi_check_region(ali1535_smba, ALI1535_SMB_IOSIZE, |
| 176 | ali1535_driver.name); |
| 177 | if (retval) |
| 178 | goto exit; |
| 179 | |
Jean Delvare | d6072f8 | 2005-09-25 16:37:04 +0200 | [diff] [blame] | 180 | if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE, |
| 181 | ali1535_driver.name)) { |
corentin.labbe | 65a2d74 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 182 | dev_err(&dev->dev, "ALI1535_smb region 0x%lx already in use!\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | ali1535_smba); |
Jean Delvare | 7c1f59c | 2012-01-12 20:32:03 +0100 | [diff] [blame] | 184 | retval = -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | goto exit; |
| 186 | } |
| 187 | |
| 188 | /* check if whole device is enabled */ |
| 189 | pci_read_config_byte(dev, SMBCFG, &temp); |
| 190 | if ((temp & ALI1535_SMBIO_EN) == 0) { |
| 191 | dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n"); |
Jean Delvare | 7c1f59c | 2012-01-12 20:32:03 +0100 | [diff] [blame] | 192 | retval = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | goto exit_free; |
| 194 | } |
| 195 | |
| 196 | /* Is SMB Host controller enabled? */ |
| 197 | pci_read_config_byte(dev, SMBHSTCFG, &temp); |
| 198 | if ((temp & 1) == 0) { |
| 199 | dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n"); |
Jean Delvare | 7c1f59c | 2012-01-12 20:32:03 +0100 | [diff] [blame] | 200 | retval = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | goto exit_free; |
| 202 | } |
| 203 | |
| 204 | /* set SMB clock to 74KHz as recommended in data sheet */ |
| 205 | pci_write_config_byte(dev, SMBCLK, 0x20); |
| 206 | |
| 207 | /* |
| 208 | The interrupt routing for SMB is set up in register 0x77 in the |
| 209 | 1533 ISA Bridge device, NOT in the 7101 device. |
| 210 | Don't bother with finding the 1533 device and reading the register. |
| 211 | if ((....... & 0x0F) == 1) |
| 212 | dev_dbg(&dev->dev, "ALI1535 using Interrupt 9 for SMBus.\n"); |
| 213 | */ |
| 214 | pci_read_config_byte(dev, SMBREV, &temp); |
| 215 | dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp); |
corentin.labbe | 65a2d74 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 216 | dev_dbg(&dev->dev, "ALI1535_smba = 0x%lx\n", ali1535_smba); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Jean Delvare | 7c1f59c | 2012-01-12 20:32:03 +0100 | [diff] [blame] | 218 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | exit_free: |
| 221 | release_region(ali1535_smba, ALI1535_SMB_IOSIZE); |
Jean Delvare | 7c1f59c | 2012-01-12 20:32:03 +0100 | [diff] [blame] | 222 | exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | return retval; |
| 224 | } |
| 225 | |
| 226 | static int ali1535_transaction(struct i2c_adapter *adap) |
| 227 | { |
| 228 | int temp; |
| 229 | int result = 0; |
| 230 | int timeout = 0; |
| 231 | |
| 232 | dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, TYP=%02x, " |
| 233 | "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", |
| 234 | inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD), |
| 235 | inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); |
| 236 | |
| 237 | /* get status */ |
| 238 | temp = inb_p(SMBHSTSTS); |
| 239 | |
| 240 | /* Make sure the SMBus host is ready to start transmitting */ |
| 241 | /* Check the busy bit first */ |
| 242 | if (temp & ALI1535_STS_BUSY) { |
| 243 | /* If the host controller is still busy, it may have timed out |
| 244 | * in the previous transaction, resulting in a "SMBus Timeout" |
| 245 | * printk. I've tried the following to reset a stuck busy bit. |
| 246 | * 1. Reset the controller with an KILL command. (this |
| 247 | * doesn't seem to clear the controller if an external |
| 248 | * device is hung) |
| 249 | * 2. Reset the controller and the other SMBus devices with a |
| 250 | * T_OUT command. (this clears the host busy bit if an |
| 251 | * external device is hung, but it comes back upon a new |
| 252 | * access to a device) |
| 253 | * 3. Disable and reenable the controller in SMBHSTCFG. Worst |
| 254 | * case, nothing seems to work except power reset. |
| 255 | */ |
| 256 | |
| 257 | /* Try resetting entire SMB bus, including other devices - This |
| 258 | * may not work either - it clears the BUSY bit but then the |
| 259 | * BUSY bit may come back on when you try and use the chip |
| 260 | * again. If that's the case you are stuck. |
| 261 | */ |
| 262 | dev_info(&adap->dev, |
| 263 | "Resetting entire SMB Bus to clear busy condition (%02x)\n", |
| 264 | temp); |
| 265 | outb_p(ALI1535_T_OUT, SMBHSTTYP); |
| 266 | temp = inb_p(SMBHSTSTS); |
| 267 | } |
| 268 | |
| 269 | /* now check the error bits and the busy bit */ |
| 270 | if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) { |
| 271 | /* do a clear-on-write */ |
| 272 | outb_p(0xFF, SMBHSTSTS); |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 273 | temp = inb_p(SMBHSTSTS); |
| 274 | if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | /* This is probably going to be correctable only by a |
| 276 | * power reset as one of the bits now appears to be |
| 277 | * stuck */ |
| 278 | /* This may be a bus or device with electrical problems. */ |
| 279 | dev_err(&adap->dev, |
| 280 | "SMBus reset failed! (0x%02x) - controller or " |
| 281 | "device on bus is probably hung\n", temp); |
David Brownell | 9714034 | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 282 | return -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | } |
| 284 | } else { |
| 285 | /* check and clear done bit */ |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 286 | if (temp & ALI1535_STS_DONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | outb_p(temp, SMBHSTSTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | /* start the transaction by writing anything to the start register */ |
| 291 | outb_p(0xFF, SMBHSTPORT); |
| 292 | |
| 293 | /* We will always wait for a fraction of a second! */ |
| 294 | timeout = 0; |
| 295 | do { |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 296 | usleep_range(1000, 2000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | temp = inb_p(SMBHSTSTS); |
| 298 | } while (((temp & ALI1535_STS_BUSY) && !(temp & ALI1535_STS_IDLE)) |
| 299 | && (timeout++ < MAX_TIMEOUT)); |
| 300 | |
| 301 | /* If the SMBus is still busy, we give up */ |
Roel Kluin | 4ccc28f | 2009-05-05 08:39:24 +0200 | [diff] [blame] | 302 | if (timeout > MAX_TIMEOUT) { |
David Brownell | 9714034 | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 303 | result = -ETIMEDOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | dev_err(&adap->dev, "SMBus Timeout!\n"); |
| 305 | } |
| 306 | |
| 307 | if (temp & ALI1535_STS_FAIL) { |
David Brownell | 9714034 | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 308 | result = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | dev_dbg(&adap->dev, "Error: Failed bus transaction\n"); |
| 310 | } |
| 311 | |
| 312 | /* Unfortunately the ALI SMB controller maps "no response" and "bus |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 313 | * collision" into a single bit. No response is the usual case so don't |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | * do a printk. This means that bus collisions go unreported. |
| 315 | */ |
| 316 | if (temp & ALI1535_STS_BUSERR) { |
David Brownell | 9714034 | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 317 | result = -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | dev_dbg(&adap->dev, |
| 319 | "Error: no response or bus collision ADD=%02x\n", |
| 320 | inb_p(SMBHSTADD)); |
| 321 | } |
| 322 | |
| 323 | /* haven't ever seen this */ |
| 324 | if (temp & ALI1535_STS_DEV) { |
David Brownell | 9714034 | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 325 | result = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | dev_err(&adap->dev, "Error: device error\n"); |
| 327 | } |
| 328 | |
| 329 | /* check to see if the "command complete" indication is set */ |
| 330 | if (!(temp & ALI1535_STS_DONE)) { |
David Brownell | 9714034 | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 331 | result = -ETIMEDOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | dev_err(&adap->dev, "Error: command never completed\n"); |
| 333 | } |
| 334 | |
| 335 | dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, " |
| 336 | "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", |
| 337 | inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD), |
| 338 | inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); |
| 339 | |
| 340 | /* take consequent actions for error conditions */ |
| 341 | if (!(temp & ALI1535_STS_DONE)) { |
| 342 | /* issue "kill" to reset host controller */ |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 343 | outb_p(ALI1535_KILL, SMBHSTTYP); |
| 344 | outb_p(0xFF, SMBHSTSTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } else if (temp & ALI1535_STS_ERR) { |
| 346 | /* issue "timeout" to reset all devices on bus */ |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 347 | outb_p(ALI1535_T_OUT, SMBHSTTYP); |
| 348 | outb_p(0xFF, SMBHSTSTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | return result; |
| 352 | } |
| 353 | |
David Brownell | 9714034 | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 354 | /* Return negative errno on error. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | static s32 ali1535_access(struct i2c_adapter *adap, u16 addr, |
| 356 | unsigned short flags, char read_write, u8 command, |
| 357 | int size, union i2c_smbus_data *data) |
| 358 | { |
| 359 | int i, len; |
| 360 | int temp; |
| 361 | int timeout; |
| 362 | s32 result = 0; |
| 363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | /* make sure SMBus is idle */ |
| 365 | temp = inb_p(SMBHSTSTS); |
| 366 | for (timeout = 0; |
| 367 | (timeout < MAX_TIMEOUT) && !(temp & ALI1535_STS_IDLE); |
| 368 | timeout++) { |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 369 | usleep_range(1000, 2000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | temp = inb_p(SMBHSTSTS); |
| 371 | } |
| 372 | if (timeout >= MAX_TIMEOUT) |
| 373 | dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp); |
| 374 | |
| 375 | /* clear status register (clear-on-write) */ |
| 376 | outb_p(0xFF, SMBHSTSTS); |
| 377 | |
| 378 | switch (size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | case I2C_SMBUS_QUICK: |
| 380 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
| 381 | SMBHSTADD); |
| 382 | size = ALI1535_QUICK; |
| 383 | outb_p(size, SMBHSTTYP); /* output command */ |
| 384 | break; |
| 385 | case I2C_SMBUS_BYTE: |
| 386 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
| 387 | SMBHSTADD); |
| 388 | size = ALI1535_BYTE; |
| 389 | outb_p(size, SMBHSTTYP); /* output command */ |
| 390 | if (read_write == I2C_SMBUS_WRITE) |
| 391 | outb_p(command, SMBHSTCMD); |
| 392 | break; |
| 393 | case I2C_SMBUS_BYTE_DATA: |
| 394 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
| 395 | SMBHSTADD); |
| 396 | size = ALI1535_BYTE_DATA; |
| 397 | outb_p(size, SMBHSTTYP); /* output command */ |
| 398 | outb_p(command, SMBHSTCMD); |
| 399 | if (read_write == I2C_SMBUS_WRITE) |
| 400 | outb_p(data->byte, SMBHSTDAT0); |
| 401 | break; |
| 402 | case I2C_SMBUS_WORD_DATA: |
| 403 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
| 404 | SMBHSTADD); |
| 405 | size = ALI1535_WORD_DATA; |
| 406 | outb_p(size, SMBHSTTYP); /* output command */ |
| 407 | outb_p(command, SMBHSTCMD); |
| 408 | if (read_write == I2C_SMBUS_WRITE) { |
| 409 | outb_p(data->word & 0xff, SMBHSTDAT0); |
| 410 | outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); |
| 411 | } |
| 412 | break; |
| 413 | case I2C_SMBUS_BLOCK_DATA: |
| 414 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
| 415 | SMBHSTADD); |
| 416 | size = ALI1535_BLOCK_DATA; |
| 417 | outb_p(size, SMBHSTTYP); /* output command */ |
| 418 | outb_p(command, SMBHSTCMD); |
| 419 | if (read_write == I2C_SMBUS_WRITE) { |
| 420 | len = data->block[0]; |
| 421 | if (len < 0) { |
| 422 | len = 0; |
| 423 | data->block[0] = len; |
| 424 | } |
| 425 | if (len > 32) { |
| 426 | len = 32; |
| 427 | data->block[0] = len; |
| 428 | } |
| 429 | outb_p(len, SMBHSTDAT0); |
| 430 | /* Reset SMBBLKDAT */ |
| 431 | outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP); |
| 432 | for (i = 1; i <= len; i++) |
| 433 | outb_p(data->block[i], SMBBLKDAT); |
| 434 | } |
| 435 | break; |
Jean Delvare | ac7fc4f | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 436 | default: |
| 437 | dev_warn(&adap->dev, "Unsupported transaction %d\n", size); |
| 438 | result = -EOPNOTSUPP; |
| 439 | goto EXIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
| 441 | |
David Brownell | 9714034 | 2008-07-14 22:38:25 +0200 | [diff] [blame] | 442 | result = ali1535_transaction(adap); |
| 443 | if (result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | goto EXIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | if ((read_write == I2C_SMBUS_WRITE) || (size == ALI1535_QUICK)) { |
| 447 | result = 0; |
| 448 | goto EXIT; |
| 449 | } |
| 450 | |
| 451 | switch (size) { |
| 452 | case ALI1535_BYTE: /* Result put in SMBHSTDAT0 */ |
| 453 | data->byte = inb_p(SMBHSTDAT0); |
| 454 | break; |
| 455 | case ALI1535_BYTE_DATA: |
| 456 | data->byte = inb_p(SMBHSTDAT0); |
| 457 | break; |
| 458 | case ALI1535_WORD_DATA: |
| 459 | data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); |
| 460 | break; |
| 461 | case ALI1535_BLOCK_DATA: |
| 462 | len = inb_p(SMBHSTDAT0); |
| 463 | if (len > 32) |
| 464 | len = 32; |
| 465 | data->block[0] = len; |
| 466 | /* Reset SMBBLKDAT */ |
| 467 | outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP); |
| 468 | for (i = 1; i <= data->block[0]; i++) { |
| 469 | data->block[i] = inb_p(SMBBLKDAT); |
| 470 | dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n", |
| 471 | len, i, data->block[i]); |
| 472 | } |
| 473 | break; |
| 474 | } |
| 475 | EXIT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | return result; |
| 477 | } |
| 478 | |
| 479 | |
| 480 | static u32 ali1535_func(struct i2c_adapter *adapter) |
| 481 | { |
| 482 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
| 483 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
| 484 | I2C_FUNC_SMBUS_BLOCK_DATA; |
| 485 | } |
| 486 | |
Jean Delvare | 8f9082c | 2006-09-03 22:39:46 +0200 | [diff] [blame] | 487 | static const struct i2c_algorithm smbus_algorithm = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | .smbus_xfer = ali1535_access, |
| 489 | .functionality = ali1535_func, |
| 490 | }; |
| 491 | |
| 492 | static struct i2c_adapter ali1535_adapter = { |
| 493 | .owner = THIS_MODULE, |
Jean Delvare | 3401b2f | 2008-07-14 22:38:29 +0200 | [diff] [blame] | 494 | .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | .algo = &smbus_algorithm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | }; |
| 497 | |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 498 | static DEFINE_PCI_DEVICE_TABLE(ali1535_ids) = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) }, |
| 500 | { }, |
| 501 | }; |
| 502 | |
LABBE Corentin | 3fea5df | 2011-07-25 17:49:42 +0200 | [diff] [blame] | 503 | MODULE_DEVICE_TABLE(pci, ali1535_ids); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 505 | static int ali1535_probe(struct pci_dev *dev, const struct pci_device_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | { |
| 507 | if (ali1535_setup(dev)) { |
| 508 | dev_warn(&dev->dev, |
| 509 | "ALI1535 not detected, module not inserted.\n"); |
| 510 | return -ENODEV; |
| 511 | } |
| 512 | |
Robert P. J. Day | 405ae7d | 2007-02-17 19:13:42 +0100 | [diff] [blame] | 513 | /* set up the sysfs linkage to our parent device */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | ali1535_adapter.dev.parent = &dev->dev; |
| 515 | |
David Brownell | 2096b95 | 2007-05-01 23:26:28 +0200 | [diff] [blame] | 516 | snprintf(ali1535_adapter.name, sizeof(ali1535_adapter.name), |
corentin.labbe | 65a2d74 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 517 | "SMBus ALI1535 adapter at %04x", ali1535_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | return i2c_add_adapter(&ali1535_adapter); |
| 519 | } |
| 520 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 521 | static void ali1535_remove(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
| 523 | i2c_del_adapter(&ali1535_adapter); |
| 524 | release_region(ali1535_smba, ALI1535_SMB_IOSIZE); |
| 525 | } |
| 526 | |
| 527 | static struct pci_driver ali1535_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | .name = "ali1535_smbus", |
| 529 | .id_table = ali1535_ids, |
| 530 | .probe = ali1535_probe, |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 531 | .remove = ali1535_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | }; |
| 533 | |
Axel Lin | 56f2178 | 2012-07-24 14:13:56 +0200 | [diff] [blame] | 534 | module_pci_driver(ali1535_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
| 536 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, " |
| 537 | "Philip Edelbrock <phil@netroedge.com>, " |
| 538 | "Mark D. Studebaker <mdsxyz123@yahoo.com> " |
| 539 | "and Dan Eaton <dan.eaton@rocketlogix.com>"); |
| 540 | MODULE_DESCRIPTION("ALI1535 SMBus driver"); |
| 541 | MODULE_LICENSE("GPL"); |