diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/busses/i2c-ali1535.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/i2c/busses/i2c-ali1535.c | 552 |
1 files changed, 0 insertions, 552 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/busses/i2c-ali1535.c b/ANDROID_3.4.5/drivers/i2c/busses/i2c-ali1535.c deleted file mode 100644 index e66d248f..00000000 --- a/ANDROID_3.4.5/drivers/i2c/busses/i2c-ali1535.c +++ /dev/null @@ -1,552 +0,0 @@ -/* - * Copyright (c) 2000 Frodo Looijaard <frodol@dds.nl>, - * Philip Edelbrock <phil@netroedge.com>, - * Mark D. Studebaker <mdsxyz123@yahoo.com>, - * Dan Eaton <dan.eaton@rocketlogix.com> and - * Stephen Rousset <stephen.rousset@rocketlogix.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -/* - This is the driver for the SMB Host controller on - Acer Labs Inc. (ALI) M1535 South Bridge. - - The M1535 is a South bridge for portable systems. - It is very similar to the M15x3 South bridges also produced - by Acer Labs Inc. Some of the registers within the part - have moved and some have been redefined slightly. Additionally, - the sequencing of the SMBus transactions has been modified - to be more consistent with the sequencing recommended by - the manufacturer and observed through testing. These - changes are reflected in this driver and can be identified - by comparing this driver to the i2c-ali15x3 driver. - For an overview of these chips see http://www.acerlabs.com - - The SMB controller is part of the 7101 device, which is an - ACPI-compliant Power Management Unit (PMU). - - The whole 7101 device has to be enabled for the SMB to work. - You can't just enable the SMB alone. - The SMB and the ACPI have separate I/O spaces. - We make sure that the SMB is enabled. We leave the ACPI alone. - - This driver controls the SMB Host only. - - This driver does not use interrupts. -*/ - - -/* Note: we assume there can only be one ALI1535, with one SMBus interface */ - -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/kernel.h> -#include <linux/stddef.h> -#include <linux/delay.h> -#include <linux/ioport.h> -#include <linux/i2c.h> -#include <linux/init.h> -#include <linux/acpi.h> -#include <linux/io.h> - - -/* ALI1535 SMBus address offsets */ -#define SMBHSTSTS (0 + ali1535_smba) -#define SMBHSTTYP (1 + ali1535_smba) -#define SMBHSTPORT (2 + ali1535_smba) -#define SMBHSTCMD (7 + ali1535_smba) -#define SMBHSTADD (3 + ali1535_smba) -#define SMBHSTDAT0 (4 + ali1535_smba) -#define SMBHSTDAT1 (5 + ali1535_smba) -#define SMBBLKDAT (6 + ali1535_smba) - -/* PCI Address Constants */ -#define SMBCOM 0x004 -#define SMBREV 0x008 -#define SMBCFG 0x0D1 -#define SMBBA 0x0E2 -#define SMBHSTCFG 0x0F0 -#define SMBCLK 0x0F2 - -/* Other settings */ -#define MAX_TIMEOUT 500 /* times 1/100 sec */ -#define ALI1535_SMB_IOSIZE 32 - -#define ALI1535_SMB_DEFAULTBASE 0x8040 - -/* ALI1535 address lock bits */ -#define ALI1535_LOCK 0x06 /* dwe */ - -/* ALI1535 command constants */ -#define ALI1535_QUICK 0x00 -#define ALI1535_BYTE 0x10 -#define ALI1535_BYTE_DATA 0x20 -#define ALI1535_WORD_DATA 0x30 -#define ALI1535_BLOCK_DATA 0x40 -#define ALI1535_I2C_READ 0x60 - -#define ALI1535_DEV10B_EN 0x80 /* Enable 10-bit addressing in */ - /* I2C read */ -#define ALI1535_T_OUT 0x08 /* Time-out Command (write) */ -#define ALI1535_A_HIGH_BIT9 0x08 /* Bit 9 of 10-bit address in */ - /* Alert-Response-Address */ - /* (read) */ -#define ALI1535_KILL 0x04 /* Kill Command (write) */ -#define ALI1535_A_HIGH_BIT8 0x04 /* Bit 8 of 10-bit address in */ - /* Alert-Response-Address */ - /* (read) */ - -#define ALI1535_D_HI_MASK 0x03 /* Mask for isolating bits 9-8 */ - /* of 10-bit address in I2C */ - /* Read Command */ - -/* ALI1535 status register bits */ -#define ALI1535_STS_IDLE 0x04 -#define ALI1535_STS_BUSY 0x08 /* host busy */ -#define ALI1535_STS_DONE 0x10 /* transaction complete */ -#define ALI1535_STS_DEV 0x20 /* device error */ -#define ALI1535_STS_BUSERR 0x40 /* bus error */ -#define ALI1535_STS_FAIL 0x80 /* failed bus transaction */ -#define ALI1535_STS_ERR 0xE0 /* all the bad error bits */ - -#define ALI1535_BLOCK_CLR 0x04 /* reset block data index */ - -/* ALI1535 device address register bits */ -#define ALI1535_RD_ADDR 0x01 /* Read/Write Bit in Device */ - /* Address field */ - /* -> Write = 0 */ - /* -> Read = 1 */ -#define ALI1535_SMBIO_EN 0x04 /* SMB I/O Space enable */ - -static struct pci_driver ali1535_driver; -static unsigned long ali1535_smba; -static unsigned short ali1535_offset; - -/* Detect whether a ALI1535 can be found, and initialize it, where necessary. - Note the differences between kernels with the old PCI BIOS interface and - newer kernels with the real PCI interface. In compat.h some things are - defined to make the transition easier. */ -static int __devinit ali1535_setup(struct pci_dev *dev) -{ - int retval; - unsigned char temp; - - /* Check the following things: - - SMB I/O address is initialized - - Device is enabled - - We can use the addresses - */ - - retval = pci_enable_device(dev); - if (retval) { - dev_err(&dev->dev, "ALI1535_smb can't enable device\n"); - goto exit; - } - - /* Determine the address of the SMBus area */ - pci_read_config_word(dev, SMBBA, &ali1535_offset); - dev_dbg(&dev->dev, "ALI1535_smb is at offset 0x%04x\n", ali1535_offset); - ali1535_offset &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1)); - if (ali1535_offset == 0) { - dev_warn(&dev->dev, - "ALI1535_smb region uninitialized - upgrade BIOS?\n"); - retval = -ENODEV; - goto exit; - } - - if (pci_resource_flags(dev, 0) & IORESOURCE_IO) - ali1535_smba = pci_resource_start(dev, 0) + ali1535_offset; - else - ali1535_smba = ali1535_offset; - - retval = acpi_check_region(ali1535_smba, ALI1535_SMB_IOSIZE, - ali1535_driver.name); - if (retval) - goto exit; - - if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE, - ali1535_driver.name)) { - dev_err(&dev->dev, "ALI1535_smb region 0x%lx already in use!\n", - ali1535_smba); - retval = -EBUSY; - goto exit; - } - - /* check if whole device is enabled */ - pci_read_config_byte(dev, SMBCFG, &temp); - if ((temp & ALI1535_SMBIO_EN) == 0) { - dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n"); - retval = -ENODEV; - goto exit_free; - } - - /* Is SMB Host controller enabled? */ - pci_read_config_byte(dev, SMBHSTCFG, &temp); - if ((temp & 1) == 0) { - dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n"); - retval = -ENODEV; - goto exit_free; - } - - /* set SMB clock to 74KHz as recommended in data sheet */ - pci_write_config_byte(dev, SMBCLK, 0x20); - - /* - The interrupt routing for SMB is set up in register 0x77 in the - 1533 ISA Bridge device, NOT in the 7101 device. - Don't bother with finding the 1533 device and reading the register. - if ((....... & 0x0F) == 1) - dev_dbg(&dev->dev, "ALI1535 using Interrupt 9 for SMBus.\n"); - */ - pci_read_config_byte(dev, SMBREV, &temp); - dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp); - dev_dbg(&dev->dev, "ALI1535_smba = 0x%lx\n", ali1535_smba); - - return 0; - -exit_free: - release_region(ali1535_smba, ALI1535_SMB_IOSIZE); -exit: - return retval; -} - -static int ali1535_transaction(struct i2c_adapter *adap) -{ - int temp; - int result = 0; - int timeout = 0; - - dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, TYP=%02x, " - "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", - inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD), - inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); - - /* get status */ - temp = inb_p(SMBHSTSTS); - - /* Make sure the SMBus host is ready to start transmitting */ - /* Check the busy bit first */ - if (temp & ALI1535_STS_BUSY) { - /* If the host controller is still busy, it may have timed out - * in the previous transaction, resulting in a "SMBus Timeout" - * printk. I've tried the following to reset a stuck busy bit. - * 1. Reset the controller with an KILL command. (this - * doesn't seem to clear the controller if an external - * device is hung) - * 2. Reset the controller and the other SMBus devices with a - * T_OUT command. (this clears the host busy bit if an - * external device is hung, but it comes back upon a new - * access to a device) - * 3. Disable and reenable the controller in SMBHSTCFG. Worst - * case, nothing seems to work except power reset. - */ - - /* Try resetting entire SMB bus, including other devices - This - * may not work either - it clears the BUSY bit but then the - * BUSY bit may come back on when you try and use the chip - * again. If that's the case you are stuck. - */ - dev_info(&adap->dev, - "Resetting entire SMB Bus to clear busy condition (%02x)\n", - temp); - outb_p(ALI1535_T_OUT, SMBHSTTYP); - temp = inb_p(SMBHSTSTS); - } - - /* now check the error bits and the busy bit */ - if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) { - /* do a clear-on-write */ - outb_p(0xFF, SMBHSTSTS); - temp = inb_p(SMBHSTSTS); - if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) { - /* This is probably going to be correctable only by a - * power reset as one of the bits now appears to be - * stuck */ - /* This may be a bus or device with electrical problems. */ - dev_err(&adap->dev, - "SMBus reset failed! (0x%02x) - controller or " - "device on bus is probably hung\n", temp); - return -EBUSY; - } - } else { - /* check and clear done bit */ - if (temp & ALI1535_STS_DONE) - outb_p(temp, SMBHSTSTS); - } - - /* start the transaction by writing anything to the start register */ - outb_p(0xFF, SMBHSTPORT); - - /* We will always wait for a fraction of a second! */ - timeout = 0; - do { - usleep_range(1000, 2000); - temp = inb_p(SMBHSTSTS); - } while (((temp & ALI1535_STS_BUSY) && !(temp & ALI1535_STS_IDLE)) - && (timeout++ < MAX_TIMEOUT)); - - /* If the SMBus is still busy, we give up */ - if (timeout > MAX_TIMEOUT) { - result = -ETIMEDOUT; - dev_err(&adap->dev, "SMBus Timeout!\n"); - } - - if (temp & ALI1535_STS_FAIL) { - result = -EIO; - dev_dbg(&adap->dev, "Error: Failed bus transaction\n"); - } - - /* Unfortunately the ALI SMB controller maps "no response" and "bus - * collision" into a single bit. No response is the usual case so don't - * do a printk. This means that bus collisions go unreported. - */ - if (temp & ALI1535_STS_BUSERR) { - result = -ENXIO; - dev_dbg(&adap->dev, - "Error: no response or bus collision ADD=%02x\n", - inb_p(SMBHSTADD)); - } - - /* haven't ever seen this */ - if (temp & ALI1535_STS_DEV) { - result = -EIO; - dev_err(&adap->dev, "Error: device error\n"); - } - - /* check to see if the "command complete" indication is set */ - if (!(temp & ALI1535_STS_DONE)) { - result = -ETIMEDOUT; - dev_err(&adap->dev, "Error: command never completed\n"); - } - - dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, " - "CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n", - inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD), - inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); - - /* take consequent actions for error conditions */ - if (!(temp & ALI1535_STS_DONE)) { - /* issue "kill" to reset host controller */ - outb_p(ALI1535_KILL, SMBHSTTYP); - outb_p(0xFF, SMBHSTSTS); - } else if (temp & ALI1535_STS_ERR) { - /* issue "timeout" to reset all devices on bus */ - outb_p(ALI1535_T_OUT, SMBHSTTYP); - outb_p(0xFF, SMBHSTSTS); - } - - return result; -} - -/* Return negative errno on error. */ -static s32 ali1535_access(struct i2c_adapter *adap, u16 addr, - unsigned short flags, char read_write, u8 command, - int size, union i2c_smbus_data *data) -{ - int i, len; - int temp; - int timeout; - s32 result = 0; - - /* make sure SMBus is idle */ - temp = inb_p(SMBHSTSTS); - for (timeout = 0; - (timeout < MAX_TIMEOUT) && !(temp & ALI1535_STS_IDLE); - timeout++) { - usleep_range(1000, 2000); - temp = inb_p(SMBHSTSTS); - } - if (timeout >= MAX_TIMEOUT) - dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp); - - /* clear status register (clear-on-write) */ - outb_p(0xFF, SMBHSTSTS); - - switch (size) { - case I2C_SMBUS_QUICK: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD); - size = ALI1535_QUICK; - outb_p(size, SMBHSTTYP); /* output command */ - break; - case I2C_SMBUS_BYTE: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD); - size = ALI1535_BYTE; - outb_p(size, SMBHSTTYP); /* output command */ - if (read_write == I2C_SMBUS_WRITE) - outb_p(command, SMBHSTCMD); - break; - case I2C_SMBUS_BYTE_DATA: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD); - size = ALI1535_BYTE_DATA; - outb_p(size, SMBHSTTYP); /* output command */ - outb_p(command, SMBHSTCMD); - if (read_write == I2C_SMBUS_WRITE) - outb_p(data->byte, SMBHSTDAT0); - break; - case I2C_SMBUS_WORD_DATA: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD); - size = ALI1535_WORD_DATA; - outb_p(size, SMBHSTTYP); /* output command */ - outb_p(command, SMBHSTCMD); - if (read_write == I2C_SMBUS_WRITE) { - outb_p(data->word & 0xff, SMBHSTDAT0); - outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); - } - break; - case I2C_SMBUS_BLOCK_DATA: - outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), - SMBHSTADD); - size = ALI1535_BLOCK_DATA; - outb_p(size, SMBHSTTYP); /* output command */ - outb_p(command, SMBHSTCMD); - if (read_write == I2C_SMBUS_WRITE) { - len = data->block[0]; - if (len < 0) { - len = 0; - data->block[0] = len; - } - if (len > 32) { - len = 32; - data->block[0] = len; - } - outb_p(len, SMBHSTDAT0); - /* Reset SMBBLKDAT */ - outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP); - for (i = 1; i <= len; i++) - outb_p(data->block[i], SMBBLKDAT); - } - break; - default: - dev_warn(&adap->dev, "Unsupported transaction %d\n", size); - result = -EOPNOTSUPP; - goto EXIT; - } - - result = ali1535_transaction(adap); - if (result) - goto EXIT; - - if ((read_write == I2C_SMBUS_WRITE) || (size == ALI1535_QUICK)) { - result = 0; - goto EXIT; - } - - switch (size) { - case ALI1535_BYTE: /* Result put in SMBHSTDAT0 */ - data->byte = inb_p(SMBHSTDAT0); - break; - case ALI1535_BYTE_DATA: - data->byte = inb_p(SMBHSTDAT0); - break; - case ALI1535_WORD_DATA: - data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); - break; - case ALI1535_BLOCK_DATA: - len = inb_p(SMBHSTDAT0); - if (len > 32) - len = 32; - data->block[0] = len; - /* Reset SMBBLKDAT */ - outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP); - for (i = 1; i <= data->block[0]; i++) { - data->block[i] = inb_p(SMBBLKDAT); - dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n", - len, i, data->block[i]); - } - break; - } -EXIT: - return result; -} - - -static u32 ali1535_func(struct i2c_adapter *adapter) -{ - return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | - I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | - I2C_FUNC_SMBUS_BLOCK_DATA; -} - -static const struct i2c_algorithm smbus_algorithm = { - .smbus_xfer = ali1535_access, - .functionality = ali1535_func, -}; - -static struct i2c_adapter ali1535_adapter = { - .owner = THIS_MODULE, - .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, - .algo = &smbus_algorithm, -}; - -static DEFINE_PCI_DEVICE_TABLE(ali1535_ids) = { - { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) }, - { }, -}; - -MODULE_DEVICE_TABLE(pci, ali1535_ids); - -static int __devinit ali1535_probe(struct pci_dev *dev, const struct pci_device_id *id) -{ - if (ali1535_setup(dev)) { - dev_warn(&dev->dev, - "ALI1535 not detected, module not inserted.\n"); - return -ENODEV; - } - - /* set up the sysfs linkage to our parent device */ - ali1535_adapter.dev.parent = &dev->dev; - - snprintf(ali1535_adapter.name, sizeof(ali1535_adapter.name), - "SMBus ALI1535 adapter at %04x", ali1535_offset); - return i2c_add_adapter(&ali1535_adapter); -} - -static void __devexit ali1535_remove(struct pci_dev *dev) -{ - i2c_del_adapter(&ali1535_adapter); - release_region(ali1535_smba, ALI1535_SMB_IOSIZE); -} - -static struct pci_driver ali1535_driver = { - .name = "ali1535_smbus", - .id_table = ali1535_ids, - .probe = ali1535_probe, - .remove = __devexit_p(ali1535_remove), -}; - -static int __init i2c_ali1535_init(void) -{ - return pci_register_driver(&ali1535_driver); -} - -static void __exit i2c_ali1535_exit(void) -{ - pci_unregister_driver(&ali1535_driver); -} - -MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, " - "Philip Edelbrock <phil@netroedge.com>, " - "Mark D. Studebaker <mdsxyz123@yahoo.com> " - "and Dan Eaton <dan.eaton@rocketlogix.com>"); -MODULE_DESCRIPTION("ALI1535 SMBus driver"); -MODULE_LICENSE("GPL"); - -module_init(i2c_ali1535_init); -module_exit(i2c_ali1535_exit); |