| 1 | /* |
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| 2 | i801.c - Part of lm_sensors, Linux kernel modules for hardware |
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| 3 | monitoring |
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| 4 | Copyright (c) 1998 - 2001 Frodo Looijaard <frodol@dds.nl>, |
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| 5 | Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker |
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| 6 | <mdsxyz123@yahoo.com> |
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| 7 | |
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| 8 | This program is free software; you can redistribute it and/or modify |
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| 9 | it under the terms of the GNU General Public License as published by |
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| 10 | the Free Software Foundation; either version 2 of the License, or |
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| 11 | (at your option) any later version. |
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| 12 | |
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| 13 | This program is distributed in the hope that it will be useful, |
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | GNU General Public License for more details. |
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| 17 | |
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| 18 | You should have received a copy of the GNU General Public License |
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| 19 | along with this program; if not, write to the Free Software |
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| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 21 | */ |
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| 22 | |
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| 23 | /* |
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| 24 | This driver supports the Intel 82801AA, 82801AB, and 82801BA |
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| 25 | I/O Controller Hubs (ICH). They are similar to the PIIX4 and are part |
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| 26 | of Intel's '810' and other chipsets. |
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| 27 | See the doc/busses/i2c-i801 file for details. |
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| 28 | */ |
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| 29 | |
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| 30 | /* Note: we assume there can only be one I801, with one SMBus interface */ |
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| 31 | |
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| 32 | #include <linux/version.h> |
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| 33 | #include <linux/module.h> |
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| 34 | #include <linux/pci.h> |
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| 35 | #include <asm/io.h> |
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| 36 | #include <linux/kernel.h> |
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| 37 | #include <linux/stddef.h> |
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| 38 | #include <linux/sched.h> |
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| 39 | #include <linux/ioport.h> |
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| 40 | #include <linux/init.h> |
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| 41 | #include <linux/i2c.h> |
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| 42 | #include "version.h" |
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| 43 | |
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| 44 | #ifndef PCI_DEVICE_ID_INTEL_82801AA_3 |
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| 45 | #define PCI_DEVICE_ID_INTEL_82801AA_3 0x2413 |
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| 46 | #endif |
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| 47 | #ifndef PCI_DEVICE_ID_INTEL_82801AB_3 |
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| 48 | #define PCI_DEVICE_ID_INTEL_82801AB_3 0x2423 |
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| 49 | #endif |
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| 50 | #ifndef PCI_DEVICE_ID_INTEL_82801BA_2 |
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| 51 | #define PCI_DEVICE_ID_INTEL_82801BA_2 0x2443 |
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| 52 | #endif |
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| 53 | |
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| 54 | static int supported[] = {PCI_DEVICE_ID_INTEL_82801AA_3, |
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| 55 | PCI_DEVICE_ID_INTEL_82801AB_3, |
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| 56 | PCI_DEVICE_ID_INTEL_82801BA_2, |
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| 57 | 0 }; |
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| 58 | |
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| 59 | /* I801 SMBus address offsets */ |
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| 60 | #define SMBHSTSTS (0 + i801_smba) |
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| 61 | #define SMBHSTCNT (2 + i801_smba) |
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| 62 | #define SMBHSTCMD (3 + i801_smba) |
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| 63 | #define SMBHSTADD (4 + i801_smba) |
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| 64 | #define SMBHSTDAT0 (5 + i801_smba) |
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| 65 | #define SMBHSTDAT1 (6 + i801_smba) |
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| 66 | #define SMBBLKDAT (7 + i801_smba) |
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| 67 | |
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| 68 | /* PCI Address Constants */ |
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| 69 | #define SMBBA 0x020 |
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| 70 | #define SMBHSTCFG 0x040 |
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| 71 | #define SMBREV 0x008 |
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| 72 | |
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| 73 | /* Host configuration bits for SMBHSTCFG */ |
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| 74 | #define SMBHSTCFG_HST_EN 1 |
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| 75 | #define SMBHSTCFG_SMB_SMI_EN 2 |
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| 76 | #define SMBHSTCFG_I2C_EN 4 |
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| 77 | |
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| 78 | /* Other settings */ |
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| 79 | #define MAX_TIMEOUT 500 |
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| 80 | #define ENABLE_INT9 0 |
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| 81 | |
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| 82 | /* I801 command constants */ |
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| 83 | #define I801_QUICK 0x00 |
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| 84 | #define I801_BYTE 0x04 |
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| 85 | #define I801_BYTE_DATA 0x08 |
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| 86 | #define I801_WORD_DATA 0x0C |
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| 87 | #define I801_BLOCK_DATA 0x14 |
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| 88 | #define I801_I2C_BLOCK_DATA 0x18 /* unimplemented */ |
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| 89 | #define I801_BLOCK_LAST 0x34 |
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| 90 | #define I801_I2C_BLOCK_LAST 0x38 /* unimplemented */ |
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| 91 | |
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| 92 | /* insmod parameters */ |
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| 93 | |
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| 94 | /* If force is set to anything different from 0, we forcibly enable the |
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| 95 | I801. DANGEROUS! */ |
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| 96 | static int force = 0; |
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| 97 | MODULE_PARM(force, "i"); |
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| 98 | MODULE_PARM_DESC(force, "Forcibly enable the I801. DANGEROUS!"); |
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| 99 | |
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| 100 | /* If force_addr is set to anything different from 0, we forcibly enable |
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| 101 | the I801 at the given address. VERY DANGEROUS! */ |
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| 102 | static int force_addr = 0; |
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| 103 | MODULE_PARM(force_addr, "i"); |
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| 104 | MODULE_PARM_DESC(force_addr, |
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| 105 | "Forcibly enable the I801 at the given address. " |
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| 106 | "EXTREMELY DANGEROUS!"); |
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| 107 | |
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| 108 | #ifdef MODULE |
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| 109 | static |
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| 110 | #else |
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| 111 | extern |
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| 112 | #endif |
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| 113 | int __init i2c_i801_init(void); |
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| 114 | static int __init i801_cleanup(void); |
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| 115 | static int i801_setup(void); |
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| 116 | static s32 i801_access(struct i2c_adapter *adap, u16 addr, |
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| 117 | unsigned short flags, char read_write, |
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| 118 | u8 command, int size, union i2c_smbus_data *data); |
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| 119 | static void i801_do_pause(unsigned int amount); |
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| 120 | static int i801_transaction(void); |
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| 121 | static int i801_block_transaction(union i2c_smbus_data *data, |
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| 122 | char read_write, int i2c_enable); |
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| 123 | static void i801_inc(struct i2c_adapter *adapter); |
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| 124 | static void i801_dec(struct i2c_adapter *adapter); |
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| 125 | static u32 i801_func(struct i2c_adapter *adapter); |
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| 126 | |
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| 127 | #ifdef MODULE |
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| 128 | extern int init_module(void); |
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| 129 | extern int cleanup_module(void); |
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| 130 | #endif /* MODULE */ |
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| 131 | |
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| 132 | static struct i2c_algorithm smbus_algorithm = { |
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| 133 | /* name */ "Non-I2C SMBus adapter", |
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| 134 | /* id */ I2C_ALGO_SMBUS, |
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| 135 | /* master_xfer */ NULL, |
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| 136 | /* smbus_xfer */ i801_access, |
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| 137 | /* slave_send */ NULL, |
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| 138 | /* slave_rcv */ NULL, |
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| 139 | /* algo_control */ NULL, |
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| 140 | /* functionality */ i801_func, |
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| 141 | }; |
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| 142 | |
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| 143 | static struct i2c_adapter i801_adapter = { |
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| 144 | "unset", |
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| 145 | I2C_ALGO_SMBUS | I2C_HW_SMBUS_I801, |
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| 146 | &smbus_algorithm, |
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| 147 | NULL, |
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| 148 | i801_inc, |
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| 149 | i801_dec, |
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| 150 | NULL, |
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| 151 | NULL, |
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| 152 | }; |
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| 153 | |
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| 154 | static int __initdata i801_initialized; |
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| 155 | static unsigned short i801_smba = 0; |
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| 156 | static struct pci_dev *I801_dev = NULL; |
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| 157 | |
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| 158 | |
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| 159 | /* Detect whether a I801 can be found, and initialize it, where necessary. |
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| 160 | Note the differences between kernels with the old PCI BIOS interface and |
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| 161 | newer kernels with the real PCI interface. In compat.h some things are |
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| 162 | defined to make the transition easier. */ |
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| 163 | int i801_setup(void) |
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| 164 | { |
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| 165 | int error_return = 0; |
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| 166 | int *num = supported; |
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| 167 | unsigned char temp; |
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| 168 | |
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| 169 | /* First check whether we can access PCI at all */ |
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| 170 | if (pci_present() == 0) { |
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| 171 | printk("i2c-i801.o: Error: No PCI-bus found!\n"); |
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| 172 | error_return = -ENODEV; |
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| 173 | goto END; |
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| 174 | } |
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| 175 | |
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| 176 | /* Look for each chip */ |
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| 177 | /* Note: we keep on searching until we have found 'function 3' */ |
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| 178 | I801_dev = NULL; |
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| 179 | do { |
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| 180 | if((I801_dev = pci_find_device(PCI_VENDOR_ID_INTEL, |
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| 181 | *num, I801_dev))) { |
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| 182 | if(PCI_FUNC(I801_dev->devfn) != 3) |
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| 183 | continue; |
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| 184 | break; |
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| 185 | } |
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| 186 | num++; |
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| 187 | } while (*num != 0); |
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| 188 | |
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| 189 | if (I801_dev == NULL) { |
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| 190 | printk |
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| 191 | ("i2c-i801.o: Error: Can't detect I801, function 3!\n"); |
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| 192 | error_return = -ENODEV; |
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| 193 | goto END; |
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| 194 | } |
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| 195 | |
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| 196 | /* Determine the address of the SMBus areas */ |
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| 197 | if (force_addr) { |
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| 198 | i801_smba = force_addr & 0xfff0; |
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| 199 | force = 0; |
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| 200 | } else { |
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| 201 | pci_read_config_word(I801_dev, SMBBA, &i801_smba); |
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| 202 | i801_smba &= 0xfff0; |
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| 203 | } |
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| 204 | |
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| 205 | if (check_region(i801_smba, 8)) { |
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| 206 | printk |
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| 207 | ("i2c-i801.o: I801_smb region 0x%x already in use!\n", |
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| 208 | i801_smba); |
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| 209 | error_return = -ENODEV; |
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| 210 | goto END; |
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| 211 | } |
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| 212 | |
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| 213 | pci_read_config_byte(I801_dev, SMBHSTCFG, &temp); |
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| 214 | /* If force_addr is set, we program the new address here. Just to make |
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| 215 | sure, we disable the I801 first. */ |
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| 216 | if (force_addr) { |
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| 217 | pci_write_config_byte(I801_dev, SMBHSTCFG, temp & 0xfe); |
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| 218 | pci_write_config_word(I801_dev, SMBBA, i801_smba); |
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| 219 | pci_write_config_byte(I801_dev, SMBHSTCFG, temp | 0x01); |
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| 220 | printk |
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| 221 | ("i2c-i801.o: WARNING: I801 SMBus interface set to new " |
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| 222 | "address %04x!\n", i801_smba); |
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| 223 | } else if ((temp & 1) == 0) { |
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| 224 | if (force) { |
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| 225 | /* This should never need to be done, but has been noted that |
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| 226 | many Dell machines have the SMBus interface on the PIIX4 |
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| 227 | disabled!? NOTE: This assumes I/O space and other allocations WERE |
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| 228 | done by the Bios! Don't complain if your hardware does weird |
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| 229 | things after enabling this. :') Check for Bios updates before |
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| 230 | resorting to this. */ |
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| 231 | pci_write_config_byte(I801_dev, SMBHSTCFG, |
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| 232 | temp | 1); |
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| 233 | printk |
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| 234 | ("i2c-i801.o: WARNING: I801 SMBus interface has been FORCEFULLY " |
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| 235 | "ENABLED!\n"); |
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| 236 | } else { |
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| 237 | printk |
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| 238 | ("SMBUS: Error: Host SMBus controller not enabled!\n"); |
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| 239 | error_return = -ENODEV; |
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| 240 | goto END; |
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| 241 | } |
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| 242 | } |
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| 243 | |
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| 244 | /* note: we assumed that the BIOS picked SMBus or I2C Bus timing |
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| 245 | appropriately (bit 2 in SMBHSTCFG) */ |
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| 246 | /* Everything is happy, let's grab the memory and set things up. */ |
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| 247 | request_region(i801_smba, 8, "i801-smbus"); |
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| 248 | |
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| 249 | #ifdef DEBUG |
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| 250 | if (temp & 0x02) |
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| 251 | printk |
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| 252 | ("i2c-i801.o: I801 using Interrupt SMI# for SMBus.\n"); |
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| 253 | else |
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| 254 | printk |
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| 255 | ("i2c-i801.o: I801 using PCI Interrupt for SMBus.\n"); |
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| 256 | |
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| 257 | pci_read_config_byte(I801_dev, SMBREV, &temp); |
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| 258 | printk("i2c-i801.o: SMBREV = 0x%X\n", temp); |
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| 259 | printk("i2c-i801.o: I801_smba = 0x%X\n", i801_smba); |
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| 260 | #endif /* DEBUG */ |
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| 261 | |
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| 262 | END: |
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| 263 | return error_return; |
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| 264 | } |
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| 265 | |
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| 266 | |
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| 267 | /* Internally used pause function */ |
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| 268 | void i801_do_pause(unsigned int amount) |
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| 269 | { |
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| 270 | current->state = TASK_INTERRUPTIBLE; |
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| 271 | schedule_timeout(amount); |
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| 272 | } |
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| 273 | |
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| 274 | /* Another internally used function */ |
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| 275 | int i801_transaction(void) |
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| 276 | { |
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| 277 | int temp; |
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| 278 | int result = 0; |
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| 279 | int timeout = 0; |
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| 280 | |
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| 281 | #ifdef DEBUG |
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| 282 | printk |
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| 283 | ("i2c-i801.o: Transaction (pre): CNT=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, " |
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| 284 | "DAT1=%02x\n", inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), |
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| 285 | inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); |
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| 286 | #endif |
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| 287 | |
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| 288 | /* Make sure the SMBus host is ready to start transmitting */ |
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| 289 | /* 0x1f = Failed, Bus_Err, Dev_Err, Intr, Host_Busy */ |
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| 290 | if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) { |
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| 291 | #ifdef DEBUG |
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| 292 | printk("i2c-i801.o: SMBus busy (%02x). Resetting... \n", |
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| 293 | temp); |
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| 294 | #endif |
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| 295 | outb_p(temp, SMBHSTSTS); |
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| 296 | if ((temp = inb_p(SMBHSTSTS)) != 0x00) { |
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| 297 | #ifdef DEBUG |
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| 298 | printk("i2c-i801.o: Failed! (%02x)\n", temp); |
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| 299 | #endif |
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| 300 | return -1; |
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| 301 | } else { |
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| 302 | #ifdef DEBUG |
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| 303 | printk("i2c-i801.o: Successfull!\n"); |
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| 304 | #endif |
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| 305 | } |
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| 306 | } |
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| 307 | |
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| 308 | /* start the transaction by setting bit 6 */ |
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| 309 | outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT); |
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| 310 | |
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| 311 | /* We will always wait for a fraction of a second! */ |
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| 312 | do { |
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| 313 | i801_do_pause(1); |
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| 314 | temp = inb_p(SMBHSTSTS); |
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| 315 | } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT)); |
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| 316 | |
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| 317 | /* If the SMBus is still busy, we give up */ |
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| 318 | if (timeout >= MAX_TIMEOUT) { |
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| 319 | #ifdef DEBUG |
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| 320 | printk("i2c-i801.o: SMBus Timeout!\n"); |
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| 321 | result = -1; |
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| 322 | #endif |
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| 323 | } |
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| 324 | |
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| 325 | if (temp & 0x10) { |
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| 326 | result = -1; |
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| 327 | #ifdef DEBUG |
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| 328 | printk("i2c-i801.o: Error: Failed bus transaction\n"); |
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| 329 | #endif |
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| 330 | } |
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| 331 | |
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| 332 | if (temp & 0x08) { |
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| 333 | result = -1; |
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| 334 | printk |
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| 335 | ("i2c-i801.o: Bus collision! SMBus may be locked until next hard\n" |
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| 336 | "reset. (sorry!)\n"); |
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| 337 | /* Clock stops and slave is stuck in mid-transmission */ |
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| 338 | } |
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| 339 | |
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| 340 | if (temp & 0x04) { |
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| 341 | result = -1; |
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| 342 | #ifdef DEBUG |
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| 343 | printk("i2c-i801.o: Error: no response!\n"); |
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| 344 | #endif |
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| 345 | } |
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| 346 | |
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| 347 | if ((inb_p(SMBHSTSTS) & 0x1f) != 0x00) |
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| 348 | outb_p(inb(SMBHSTSTS), SMBHSTSTS); |
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| 349 | |
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| 350 | if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) { |
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| 351 | #ifdef DEBUG |
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| 352 | printk |
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| 353 | ("i2c-i801.o: Failed reset at end of transaction (%02x)\n", |
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| 354 | temp); |
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| 355 | #endif |
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| 356 | } |
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| 357 | #ifdef DEBUG |
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| 358 | printk |
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| 359 | ("i2c-i801.o: Transaction (post): CNT=%02x, CMD=%02x, ADD=%02x, " |
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| 360 | "DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), |
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| 361 | inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); |
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| 362 | #endif |
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| 363 | return result; |
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| 364 | } |
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| 365 | |
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| 366 | /* All-inclusive block transaction function */ |
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| 367 | int i801_block_transaction(union i2c_smbus_data *data, char read_write, |
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| 368 | int i2c_enable) |
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| 369 | { |
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| 370 | int i, len; |
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| 371 | int smbcmd; |
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| 372 | int temp; |
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| 373 | int result = 0; |
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| 374 | int timeout = 0; |
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| 375 | unsigned char hostc, errmask; |
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| 376 | |
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| 377 | if (i2c_enable) { |
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| 378 | if (read_write == I2C_SMBUS_WRITE) { |
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| 379 | /* set I2C_EN bit in configuration register */ |
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| 380 | pci_read_config_byte(I801_dev, SMBHSTCFG, &hostc); |
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| 381 | pci_write_config_byte(I801_dev, SMBHSTCFG, |
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| 382 | hostc | SMBHSTCFG_I2C_EN); |
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| 383 | } else { |
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| 384 | printk("i2c-i801.o: " |
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| 385 | "I2C_SMBUS_I2C_BLOCK_READ not supported!\n"); |
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| 386 | return -1; |
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| 387 | } |
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| 388 | } |
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| 389 | |
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| 390 | if (read_write == I2C_SMBUS_WRITE) { |
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| 391 | len = data->block[0]; |
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| 392 | if (len < 1) |
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| 393 | len = 1; |
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| 394 | if (len > 32) |
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| 395 | len = 32; |
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| 396 | outb_p(len, SMBHSTDAT0); |
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| 397 | outb_p(data->block[1], SMBBLKDAT); |
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| 398 | } else { |
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| 399 | len = 32; /* max for reads */ |
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| 400 | } |
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| 401 | |
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| 402 | for (i = 1; i <= len; i++) { |
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| 403 | if (i == len && read_write == I2C_SMBUS_READ) |
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| 404 | smbcmd = I801_BLOCK_LAST; |
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| 405 | else |
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| 406 | smbcmd = I801_BLOCK_DATA; |
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| 407 | |
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| 408 | outb_p((smbcmd & 0x3C) + (ENABLE_INT9 & 1), SMBHSTCNT); |
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| 409 | |
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| 410 | #ifdef DEBUG |
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| 411 | printk |
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| 412 | ("i2c-i801.o: Transaction (pre): CNT=%02x, CMD=%02x, ADD=%02x, " |
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| 413 | "DAT0=%02x, BLKDAT=%02x\n", inb_p(SMBHSTCNT), |
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| 414 | inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), |
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| 415 | inb_p(SMBBLKDAT)); |
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| 416 | #endif |
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| 417 | |
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| 418 | /* Make sure the SMBus host is ready to start transmitting */ |
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| 419 | temp = inb_p(SMBHSTSTS); |
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| 420 | if (i == 1) { |
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| 421 | /* Erronenous conditions before transaction: |
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| 422 | * Byte_Done, Failed, Bus_Err, Dev_Err, Intr, Host_Busy */ |
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| 423 | errmask=0x9f; |
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| 424 | } else { |
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| 425 | /* Erronenous conditions during transaction: |
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| 426 | * Failed, Bus_Err, Dev_Err, Intr */ |
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| 427 | errmask=0x1e; |
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| 428 | } |
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| 429 | if (temp & errmask) { |
|---|
| 430 | #ifdef DEBUG |
|---|
| 431 | printk |
|---|
| 432 | ("i2c-i801.o: SMBus busy (%02x). Resetting... \n", |
|---|
| 433 | temp); |
|---|
| 434 | #endif |
|---|
| 435 | outb_p(temp, SMBHSTSTS); |
|---|
| 436 | if (((temp = inb_p(SMBHSTSTS)) & errmask) != 0x00) { |
|---|
| 437 | printk |
|---|
| 438 | ("i2c-i801.o: Reset failed! (%02x)\n", |
|---|
| 439 | temp); |
|---|
| 440 | result = -1; |
|---|
| 441 | goto END; |
|---|
| 442 | } |
|---|
| 443 | if (i != 1) { |
|---|
| 444 | result = -1; /* if die in middle of block transaction, fail */ |
|---|
| 445 | goto END; |
|---|
| 446 | } |
|---|
| 447 | } |
|---|
| 448 | |
|---|
| 449 | /* start the transaction by setting bit 6 */ |
|---|
| 450 | if (i==1) outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT); |
|---|
| 451 | |
|---|
| 452 | /* We will always wait for a fraction of a second! */ |
|---|
| 453 | do { |
|---|
| 454 | temp = inb_p(SMBHSTSTS); |
|---|
| 455 | i801_do_pause(1); |
|---|
| 456 | } |
|---|
| 457 | while ( |
|---|
| 458 | (((i >= len) && (temp & 0x01)) |
|---|
| 459 | || ((i < len) && !(temp & 0x80))) |
|---|
| 460 | && (timeout++ < MAX_TIMEOUT)); |
|---|
| 461 | |
|---|
| 462 | /* If the SMBus is still busy, we give up */ |
|---|
| 463 | if (timeout >= MAX_TIMEOUT) { |
|---|
| 464 | result = -1; |
|---|
| 465 | #ifdef DEBUG |
|---|
| 466 | printk("i2c-i801.o: SMBus Timeout!\n"); |
|---|
| 467 | #endif |
|---|
| 468 | } |
|---|
| 469 | |
|---|
| 470 | if (temp & 0x10) { |
|---|
| 471 | result = -1; |
|---|
| 472 | #ifdef DEBUG |
|---|
| 473 | printk |
|---|
| 474 | ("i2c-i801.o: Error: Failed bus transaction\n"); |
|---|
| 475 | #endif |
|---|
| 476 | } else if (temp & 0x08) { |
|---|
| 477 | result = -1; |
|---|
| 478 | printk |
|---|
| 479 | ("i2c-i801.o: Bus collision! SMBus may be locked until next hard" |
|---|
| 480 | " reset. (sorry!)\n"); |
|---|
| 481 | /* Clock stops and slave is stuck in mid-transmission */ |
|---|
| 482 | } else if (temp & 0x04) { |
|---|
| 483 | result = -1; |
|---|
| 484 | #ifdef DEBUG |
|---|
| 485 | printk("i2c-i801.o: Error: no response!\n"); |
|---|
| 486 | #endif |
|---|
| 487 | } |
|---|
| 488 | |
|---|
| 489 | if (i == 1 && read_write == I2C_SMBUS_READ) { |
|---|
| 490 | len = inb_p(SMBHSTDAT0); |
|---|
| 491 | if (len < 1) |
|---|
| 492 | len = 1; |
|---|
| 493 | if (len > 32) |
|---|
| 494 | len = 32; |
|---|
| 495 | data->block[0] = len; |
|---|
| 496 | } |
|---|
| 497 | |
|---|
| 498 | /* Retrieve/store value in SMBBLKDAT */ |
|---|
| 499 | if (read_write == I2C_SMBUS_READ) |
|---|
| 500 | data->block[i] = inb_p(SMBBLKDAT); |
|---|
| 501 | if (read_write == I2C_SMBUS_WRITE && i+1 <= len) |
|---|
| 502 | outb_p(data->block[i+1], SMBBLKDAT); |
|---|
| 503 | if ((temp & 0x9e) != 0x00) |
|---|
| 504 | outb_p(temp, SMBHSTSTS); /* signals SMBBLKDAT ready */ |
|---|
| 505 | |
|---|
| 506 | temp = inb_p(SMBHSTSTS); |
|---|
| 507 | if ((temp = (0x1e & inb_p(SMBHSTSTS))) != 0x00) { |
|---|
| 508 | #ifdef DEBUG |
|---|
| 509 | printk |
|---|
| 510 | ("i2c-i801.o: Failed reset at end of transaction (%02x)\n", |
|---|
| 511 | temp); |
|---|
| 512 | #endif |
|---|
| 513 | } |
|---|
| 514 | #ifdef DEBUG |
|---|
| 515 | printk |
|---|
| 516 | ("i2c-i801.o: Transaction (post): CNT=%02x, CMD=%02x, ADD=%02x, " |
|---|
| 517 | "DAT0=%02x, BLKDAT=%02x\n", inb_p(SMBHSTCNT), |
|---|
| 518 | inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), |
|---|
| 519 | inb_p(SMBBLKDAT)); |
|---|
| 520 | #endif |
|---|
| 521 | |
|---|
| 522 | if (result < 0) { |
|---|
| 523 | goto END; |
|---|
| 524 | } |
|---|
| 525 | } |
|---|
| 526 | result = 0; |
|---|
| 527 | END: |
|---|
| 528 | if (i2c_enable) { |
|---|
| 529 | /* restore saved configuration register value */ |
|---|
| 530 | pci_write_config_byte(I801_dev, SMBHSTCFG, hostc); |
|---|
| 531 | } |
|---|
| 532 | return result; |
|---|
| 533 | } |
|---|
| 534 | |
|---|
| 535 | /* Return -1 on error. See smbus.h for more information */ |
|---|
| 536 | s32 i801_access(struct i2c_adapter * adap, u16 addr, unsigned short flags, |
|---|
| 537 | char read_write, u8 command, int size, |
|---|
| 538 | union i2c_smbus_data * data) |
|---|
| 539 | { |
|---|
| 540 | |
|---|
| 541 | switch (size) { |
|---|
| 542 | case I2C_SMBUS_PROC_CALL: |
|---|
| 543 | printk("i2c-i801.o: I2C_SMBUS_PROC_CALL not supported!\n"); |
|---|
| 544 | return -1; |
|---|
| 545 | case I2C_SMBUS_QUICK: |
|---|
| 546 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
|---|
| 547 | SMBHSTADD); |
|---|
| 548 | size = I801_QUICK; |
|---|
| 549 | break; |
|---|
| 550 | case I2C_SMBUS_BYTE: |
|---|
| 551 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
|---|
| 552 | SMBHSTADD); |
|---|
| 553 | if (read_write == I2C_SMBUS_WRITE) |
|---|
| 554 | outb_p(command, SMBHSTCMD); |
|---|
| 555 | size = I801_BYTE; |
|---|
| 556 | break; |
|---|
| 557 | case I2C_SMBUS_BYTE_DATA: |
|---|
| 558 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
|---|
| 559 | SMBHSTADD); |
|---|
| 560 | outb_p(command, SMBHSTCMD); |
|---|
| 561 | if (read_write == I2C_SMBUS_WRITE) |
|---|
| 562 | outb_p(data->byte, SMBHSTDAT0); |
|---|
| 563 | size = I801_BYTE_DATA; |
|---|
| 564 | break; |
|---|
| 565 | case I2C_SMBUS_WORD_DATA: |
|---|
| 566 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
|---|
| 567 | SMBHSTADD); |
|---|
| 568 | outb_p(command, SMBHSTCMD); |
|---|
| 569 | if (read_write == I2C_SMBUS_WRITE) { |
|---|
| 570 | outb_p(data->word & 0xff, SMBHSTDAT0); |
|---|
| 571 | outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); |
|---|
| 572 | } |
|---|
| 573 | size = I801_WORD_DATA; |
|---|
| 574 | break; |
|---|
| 575 | case I2C_SMBUS_BLOCK_DATA: |
|---|
| 576 | case I2C_SMBUS_I2C_BLOCK_DATA: |
|---|
| 577 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
|---|
| 578 | SMBHSTADD); |
|---|
| 579 | outb_p(command, SMBHSTCMD); |
|---|
| 580 | /* Block transactions are very different from piix4 block |
|---|
| 581 | and from the other i801 transactions. Handle in the |
|---|
| 582 | i801_block_transaction() routine. */ |
|---|
| 583 | return i801_block_transaction(data, read_write, |
|---|
| 584 | size==I2C_SMBUS_I2C_BLOCK_DATA); |
|---|
| 585 | } |
|---|
| 586 | |
|---|
| 587 | /* 'size' is really the transaction type */ |
|---|
| 588 | outb_p((size & 0x3C) + (ENABLE_INT9 & 1), SMBHSTCNT); |
|---|
| 589 | |
|---|
| 590 | if (i801_transaction()) /* Error in transaction */ |
|---|
| 591 | return -1; |
|---|
| 592 | |
|---|
| 593 | if ((read_write == I2C_SMBUS_WRITE) || (size == I801_QUICK)) |
|---|
| 594 | return 0; |
|---|
| 595 | |
|---|
| 596 | |
|---|
| 597 | switch (size) { |
|---|
| 598 | case I801_BYTE: /* Result put in SMBHSTDAT0 */ |
|---|
| 599 | data->byte = inb_p(SMBHSTDAT0); |
|---|
| 600 | break; |
|---|
| 601 | case I801_BYTE_DATA: |
|---|
| 602 | data->byte = inb_p(SMBHSTDAT0); |
|---|
| 603 | break; |
|---|
| 604 | case I801_WORD_DATA: |
|---|
| 605 | data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); |
|---|
| 606 | break; |
|---|
| 607 | } |
|---|
| 608 | return 0; |
|---|
| 609 | } |
|---|
| 610 | |
|---|
| 611 | void i801_inc(struct i2c_adapter *adapter) |
|---|
| 612 | { |
|---|
| 613 | MOD_INC_USE_COUNT; |
|---|
| 614 | } |
|---|
| 615 | |
|---|
| 616 | void i801_dec(struct i2c_adapter *adapter) |
|---|
| 617 | { |
|---|
| 618 | MOD_DEC_USE_COUNT; |
|---|
| 619 | } |
|---|
| 620 | |
|---|
| 621 | u32 i801_func(struct i2c_adapter *adapter) |
|---|
| 622 | { |
|---|
| 623 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
|---|
| 624 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
|---|
| 625 | I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK; |
|---|
| 626 | } |
|---|
| 627 | |
|---|
| 628 | int __init i2c_i801_init(void) |
|---|
| 629 | { |
|---|
| 630 | int res; |
|---|
| 631 | printk("i2c-i801.o version %s (%s)\n", LM_VERSION, LM_DATE); |
|---|
| 632 | #ifdef DEBUG |
|---|
| 633 | /* PE- It might be good to make this a permanent part of the code! */ |
|---|
| 634 | if (i801_initialized) { |
|---|
| 635 | printk |
|---|
| 636 | ("i2c-i801.o: Oops, i801_init called a second time!\n"); |
|---|
| 637 | return -EBUSY; |
|---|
| 638 | } |
|---|
| 639 | #endif |
|---|
| 640 | i801_initialized = 0; |
|---|
| 641 | if ((res = i801_setup())) { |
|---|
| 642 | printk |
|---|
| 643 | ("i2c-i801.o: I801 not detected, module not inserted.\n"); |
|---|
| 644 | i801_cleanup(); |
|---|
| 645 | return res; |
|---|
| 646 | } |
|---|
| 647 | i801_initialized++; |
|---|
| 648 | sprintf(i801_adapter.name, "SMBus I801 adapter at %04x", |
|---|
| 649 | i801_smba); |
|---|
| 650 | if ((res = i2c_add_adapter(&i801_adapter))) { |
|---|
| 651 | printk |
|---|
| 652 | ("i2c-i801.o: Adapter registration failed, module not inserted.\n"); |
|---|
| 653 | i801_cleanup(); |
|---|
| 654 | return res; |
|---|
| 655 | } |
|---|
| 656 | i801_initialized++; |
|---|
| 657 | printk("i2c-i801.o: I801 bus detected and initialized\n"); |
|---|
| 658 | return 0; |
|---|
| 659 | } |
|---|
| 660 | |
|---|
| 661 | int __init i801_cleanup(void) |
|---|
| 662 | { |
|---|
| 663 | int res; |
|---|
| 664 | if (i801_initialized >= 2) { |
|---|
| 665 | if ((res = i2c_del_adapter(&i801_adapter))) { |
|---|
| 666 | printk |
|---|
| 667 | ("i2c-i801.o: i2c_del_adapter failed, module not removed\n"); |
|---|
| 668 | return res; |
|---|
| 669 | } else |
|---|
| 670 | i801_initialized--; |
|---|
| 671 | } |
|---|
| 672 | if (i801_initialized >= 1) { |
|---|
| 673 | release_region(i801_smba, 8); |
|---|
| 674 | i801_initialized--; |
|---|
| 675 | } |
|---|
| 676 | return 0; |
|---|
| 677 | } |
|---|
| 678 | |
|---|
| 679 | EXPORT_NO_SYMBOLS; |
|---|
| 680 | |
|---|
| 681 | #ifdef MODULE |
|---|
| 682 | |
|---|
| 683 | MODULE_AUTHOR |
|---|
| 684 | ("Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker <mdsxyz123@yahoo.com>"); |
|---|
| 685 | MODULE_DESCRIPTION("I801 SMBus driver"); |
|---|
| 686 | |
|---|
| 687 | int init_module(void) |
|---|
| 688 | { |
|---|
| 689 | return i2c_i801_init(); |
|---|
| 690 | } |
|---|
| 691 | |
|---|
| 692 | int cleanup_module(void) |
|---|
| 693 | { |
|---|
| 694 | return i801_cleanup(); |
|---|
| 695 | } |
|---|
| 696 | |
|---|
| 697 | #endif /* MODULE */ |
|---|