| 1 | /* |
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| 2 | i2c-osb4.c - Part of lm_sensors, Linux kernel modules for hardware monitoring |
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| 3 | |
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| 4 | This program is free software; you can redistribute it and/or modify |
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| 5 | it under the terms of the GNU General Public License as published by |
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| 6 | the Free Software Foundation; either version 2 of the License, or |
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| 7 | (at your option) any later version. |
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| 8 | |
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| 9 | This program is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | GNU General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU General Public License |
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| 15 | along with this program; if not, write to the Free Software |
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| 16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 17 | |
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| 18 | This driver was partly written by Steffen Persvold (sp@scali.com) |
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| 19 | for ServerWorks OSB4 southbridge. |
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| 20 | |
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| 21 | */ |
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| 22 | |
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| 23 | /* Note: we assume there can only be one OSB4, with one SMBus interface */ |
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| 24 | |
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| 25 | #include <linux/version.h> |
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| 26 | #include <linux/module.h> |
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| 27 | #include <linux/pci.h> |
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| 28 | #include <asm/io.h> |
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| 29 | #include <linux/kernel.h> |
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| 30 | #include <linux/stddef.h> |
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| 31 | #include <linux/sched.h> |
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| 32 | #include <linux/ioport.h> |
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| 33 | #include <linux/i2c.h> |
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| 34 | #include <linux/init.h> |
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| 35 | #include "version.h" |
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| 36 | |
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| 37 | #ifndef PCI_DEVICE_ID_SERVERWORKS_OSB4 |
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| 38 | #define PCI_DEVICE_ID_SERVERWORKS_OSB4 0x0200 |
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| 39 | #endif |
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| 40 | |
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| 41 | /* OSB4 SMBus address offsets */ |
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| 42 | #define SMBHSTSTS (0 + osb4_smba) |
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| 43 | #define SMBHSLVSTS (1 + osb4_smba) |
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| 44 | #define SMBHSTCNT (2 + osb4_smba) |
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| 45 | #define SMBHSTCMD (3 + osb4_smba) |
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| 46 | #define SMBHSTADD (4 + osb4_smba) |
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| 47 | #define SMBHSTDAT0 (5 + osb4_smba) |
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| 48 | #define SMBHSTDAT1 (6 + osb4_smba) |
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| 49 | #define SMBBLKDAT (7 + osb4_smba) |
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| 50 | #define SMBSLVCNT (8 + osb4_smba) |
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| 51 | #define SMBSHDWCMD (9 + osb4_smba) |
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| 52 | #define SMBSLVEVT (0xA + osb4_smba) |
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| 53 | #define SMBSLVDAT (0xC + osb4_smba) |
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| 54 | |
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| 55 | /* PCI Address Constants */ |
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| 56 | #define SMBBA 0x090 |
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| 57 | #define SMBHSTCFG 0x0D2 |
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| 58 | #define SMBSLVC 0x0D3 |
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| 59 | #define SMBSHDW1 0x0D4 |
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| 60 | #define SMBSHDW2 0x0D5 |
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| 61 | #define SMBREV 0x0D6 |
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| 62 | |
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| 63 | /* Other settings */ |
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| 64 | #define MAX_TIMEOUT 500 |
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| 65 | #define ENABLE_INT9 0 |
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| 66 | |
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| 67 | /* OSB4 constants */ |
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| 68 | #define OSB4_QUICK 0x00 |
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| 69 | #define OSB4_BYTE 0x04 |
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| 70 | #define OSB4_BYTE_DATA 0x08 |
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| 71 | #define OSB4_WORD_DATA 0x0C |
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| 72 | #define OSB4_BLOCK_DATA 0x14 |
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| 73 | |
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| 74 | /* insmod parameters */ |
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| 75 | |
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| 76 | /* If force is set to anything different from 0, we forcibly enable the |
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| 77 | OSB4. DANGEROUS! */ |
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| 78 | static int force = 0; |
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| 79 | MODULE_PARM(force, "i"); |
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| 80 | MODULE_PARM_DESC(force, "Forcibly enable the OSB4. DANGEROUS!"); |
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| 81 | |
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| 82 | /* If force_addr is set to anything different from 0, we forcibly enable |
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| 83 | the OSB4 at the given address. VERY DANGEROUS! */ |
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| 84 | static int force_addr = 0; |
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| 85 | MODULE_PARM(force_addr, "i"); |
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| 86 | MODULE_PARM_DESC(force_addr, |
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| 87 | "Forcibly enable the OSB4 at the given address. " |
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| 88 | "EXTREMELY DANGEROUS!"); |
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| 89 | |
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| 90 | #ifdef MODULE |
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| 91 | static |
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| 92 | #else |
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| 93 | extern |
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| 94 | #endif |
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| 95 | int __init i2c_osb4_init(void); |
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| 96 | static int __init osb4_cleanup(void); |
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| 97 | static int osb4_setup(void); |
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| 98 | static s32 osb4_access(struct i2c_adapter *adap, u16 addr, |
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| 99 | unsigned short flags, char read_write, |
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| 100 | u8 command, int size, union i2c_smbus_data *data); |
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| 101 | static void osb4_do_pause(unsigned int amount); |
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| 102 | static int osb4_transaction(void); |
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| 103 | static void osb4_inc(struct i2c_adapter *adapter); |
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| 104 | static void osb4_dec(struct i2c_adapter *adapter); |
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| 105 | static u32 osb4_func(struct i2c_adapter *adapter); |
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| 106 | |
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| 107 | #ifdef MODULE |
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| 108 | extern int init_module(void); |
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| 109 | extern int cleanup_module(void); |
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| 110 | #endif /* MODULE */ |
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| 111 | |
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| 112 | static struct i2c_algorithm smbus_algorithm = { |
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| 113 | /* name */ "Non-I2C SMBus adapter", |
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| 114 | /* id */ I2C_ALGO_SMBUS, |
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| 115 | /* master_xfer */ NULL, |
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| 116 | /* smbus_access */ osb4_access, |
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| 117 | /* slave_send */ NULL, |
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| 118 | /* slave_rcv */ NULL, |
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| 119 | /* algo_control */ NULL, |
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| 120 | /* functionality */ osb4_func, |
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| 121 | }; |
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| 122 | |
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| 123 | static struct i2c_adapter osb4_adapter = { |
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| 124 | "unset", |
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| 125 | I2C_ALGO_SMBUS | I2C_HW_SMBUS_OSB4, |
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| 126 | &smbus_algorithm, |
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| 127 | NULL, |
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| 128 | osb4_inc, |
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| 129 | osb4_dec, |
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| 130 | NULL, |
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| 131 | NULL, |
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| 132 | }; |
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| 133 | |
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| 134 | static int __initdata osb4_initialized; |
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| 135 | static unsigned short osb4_smba = 0; |
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| 136 | |
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| 137 | |
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| 138 | /* Detect whether a OSB4 can be found, and initialize it, where necessary. |
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| 139 | Note the differences between kernels with the old PCI BIOS interface and |
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| 140 | newer kernels with the real PCI interface. In compat.h some things are |
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| 141 | defined to make the transition easier. */ |
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| 142 | int osb4_setup(void) |
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| 143 | { |
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| 144 | int error_return = 0; |
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| 145 | unsigned char temp; |
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| 146 | |
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| 147 | struct pci_dev *OSB4_dev; |
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| 148 | |
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| 149 | /* First check whether we can access PCI at all */ |
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| 150 | if (pci_present() == 0) { |
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| 151 | printk("i2c-osb4.o: Error: No PCI-bus found!\n"); |
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| 152 | error_return = -ENODEV; |
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| 153 | goto END; |
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| 154 | } |
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| 155 | |
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| 156 | /* Look for the OSB4, function 0 */ |
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| 157 | /* Note: we keep on searching until we have found 'function 0' */ |
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| 158 | OSB4_dev = NULL; |
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| 159 | do |
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| 160 | OSB4_dev = pci_find_device(PCI_VENDOR_ID_SERVERWORKS, |
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| 161 | PCI_DEVICE_ID_SERVERWORKS_OSB4, |
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| 162 | OSB4_dev); |
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| 163 | while (OSB4_dev && (PCI_FUNC(OSB4_dev->devfn) != 0)); |
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| 164 | if (OSB4_dev == NULL) { |
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| 165 | printk |
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| 166 | ("i2c-osb4.o: Error: Can't detect OSB4, function 0!\n"); |
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| 167 | error_return = -ENODEV; |
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| 168 | goto END; |
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| 169 | } |
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| 170 | |
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| 171 | /* Determine the address of the SMBus areas */ |
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| 172 | if (force_addr) { |
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| 173 | osb4_smba = force_addr & 0xfff0; |
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| 174 | force = 0; |
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| 175 | } else { |
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| 176 | |
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| 177 | pci_read_config_word(OSB4_dev, SMBBA, &osb4_smba); |
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| 178 | osb4_smba &= 0xfff0; |
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| 179 | } |
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| 180 | |
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| 181 | if (check_region(osb4_smba, 8)) { |
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| 182 | printk |
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| 183 | ("i2c-osb4.o: OSB4_smb region 0x%x already in use!\n", |
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| 184 | osb4_smba); |
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| 185 | error_return = -ENODEV; |
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| 186 | goto END; |
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| 187 | } |
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| 188 | |
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| 189 | pci_read_config_byte(OSB4_dev, SMBHSTCFG, &temp); |
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| 190 | /* If force_addr is set, we program the new address here. Just to make |
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| 191 | sure, we disable the OSB4 first. */ |
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| 192 | if (force_addr) { |
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| 193 | pci_write_config_byte(OSB4_dev, SMBHSTCFG, temp & 0xfe); |
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| 194 | pci_write_config_word(OSB4_dev, SMBBA, osb4_smba); |
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| 195 | pci_write_config_byte(OSB4_dev, SMBHSTCFG, temp | 0x01); |
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| 196 | printk |
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| 197 | ("i2c-osb4.o: WARNING: OSB4 SMBus interface set to new " |
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| 198 | "address %04x!\n", osb4_smba); |
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| 199 | } else if ((temp & 1) == 0) { |
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| 200 | if (force) { |
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| 201 | /* NOTE: This assumes I/O space and other allocations WERE |
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| 202 | done by the Bios! Don't complain if your hardware does weird |
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| 203 | things after enabling this. :') Check for Bios updates before |
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| 204 | resorting to this. */ |
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| 205 | pci_write_config_byte(OSB4_dev, SMBHSTCFG, |
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| 206 | temp | 1); |
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| 207 | printk |
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| 208 | ("i2c-osb4.o: WARNING: OSB4 SMBus interface has been FORCEFULLY " |
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| 209 | "ENABLED!\n"); |
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| 210 | } else { |
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| 211 | printk |
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| 212 | ("SMBUS: Error: Host SMBus controller not enabled!\n"); |
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| 213 | error_return = -ENODEV; |
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| 214 | goto END; |
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| 215 | } |
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| 216 | } |
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| 217 | |
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| 218 | /* Everything is happy, let's grab the memory and set things up. */ |
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| 219 | request_region(osb4_smba, 8, "osb4-smbus"); |
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| 220 | |
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| 221 | #ifdef DEBUG |
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| 222 | if ((temp & 0x0E) == 8) |
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| 223 | printk |
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| 224 | ("i2c-osb4.o: OSB4 using Interrupt 9 for SMBus.\n"); |
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| 225 | else if ((temp & 0x0E) == 0) |
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| 226 | printk |
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| 227 | ("i2c-osb4.o: OSB4 using Interrupt SMI# for SMBus.\n"); |
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| 228 | else |
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| 229 | printk |
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| 230 | ("i2c-osb4.o: OSB4: Illegal Interrupt configuration (or code out " |
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| 231 | "of date)!\n"); |
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| 232 | |
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| 233 | pci_read_config_byte(OSB4_dev, SMBREV, &temp); |
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| 234 | printk("i2c-osb4.o: SMBREV = 0x%X\n", temp); |
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| 235 | printk("i2c-osb4.o: OSB4_smba = 0x%X\n", osb4_smba); |
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| 236 | #endif /* DEBUG */ |
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| 237 | |
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| 238 | END: |
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| 239 | return error_return; |
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| 240 | } |
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| 241 | |
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| 242 | |
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| 243 | /* Internally used pause function */ |
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| 244 | void osb4_do_pause(unsigned int amount) |
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| 245 | { |
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| 246 | current->state = TASK_INTERRUPTIBLE; |
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| 247 | schedule_timeout(amount); |
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| 248 | } |
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| 249 | |
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| 250 | /* Another internally used function */ |
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| 251 | int osb4_transaction(void) |
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| 252 | { |
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| 253 | int temp; |
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| 254 | int result = 0; |
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| 255 | int timeout = 0; |
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| 256 | |
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| 257 | #ifdef DEBUG |
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| 258 | printk |
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| 259 | ("i2c-osb4.o: Transaction (pre): CNT=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, " |
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| 260 | "DAT1=%02x\n", inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), |
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| 261 | inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); |
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| 262 | #endif |
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| 263 | |
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| 264 | /* Make sure the SMBus host is ready to start transmitting */ |
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| 265 | if ((temp = inb_p(SMBHSTSTS)) != 0x00) { |
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| 266 | #ifdef DEBUG |
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| 267 | printk("i2c-osb4.o: SMBus busy (%02x). Resetting... \n", |
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| 268 | temp); |
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| 269 | #endif |
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| 270 | outb_p(temp, SMBHSTSTS); |
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| 271 | if ((temp = inb_p(SMBHSTSTS)) != 0x00) { |
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| 272 | #ifdef DEBUG |
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| 273 | printk("i2c-osb4.o: Failed! (%02x)\n", temp); |
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| 274 | #endif |
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| 275 | return -1; |
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| 276 | } else { |
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| 277 | #ifdef DEBUG |
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| 278 | printk("i2c-osb4.o: Successfull!\n"); |
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| 279 | #endif |
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| 280 | } |
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| 281 | } |
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| 282 | |
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| 283 | /* start the transaction by setting bit 6 */ |
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| 284 | outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT); |
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| 285 | |
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| 286 | /* We will always wait for a fraction of a second! (See OSB4 docs errata) */ |
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| 287 | do { |
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| 288 | osb4_do_pause(1); |
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| 289 | temp = inb_p(SMBHSTSTS); |
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| 290 | } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT)); |
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| 291 | |
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| 292 | /* If the SMBus is still busy, we give up */ |
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| 293 | if (timeout >= MAX_TIMEOUT) { |
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| 294 | #ifdef DEBUG |
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| 295 | printk("i2c-osb4.o: SMBus Timeout!\n"); |
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| 296 | result = -1; |
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| 297 | #endif |
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| 298 | } |
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| 299 | |
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| 300 | if (temp & 0x10) { |
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| 301 | result = -1; |
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| 302 | #ifdef DEBUG |
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| 303 | printk("i2c-osb4.o: Error: Failed bus transaction\n"); |
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| 304 | #endif |
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| 305 | } |
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| 306 | |
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| 307 | if (temp & 0x08) { |
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| 308 | result = -1; |
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| 309 | printk |
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| 310 | ("i2c-osb4.o: Bus collision! SMBus may be locked until next hard\n" |
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| 311 | "reset. (sorry!)\n"); |
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| 312 | /* Clock stops and slave is stuck in mid-transmission */ |
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| 313 | } |
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| 314 | |
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| 315 | if (temp & 0x04) { |
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| 316 | result = -1; |
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| 317 | #ifdef DEBUG |
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| 318 | printk("i2c-osb4.o: Error: no response!\n"); |
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| 319 | #endif |
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| 320 | } |
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| 321 | |
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| 322 | if (inb_p(SMBHSTSTS) != 0x00) |
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| 323 | outb_p(inb(SMBHSTSTS), SMBHSTSTS); |
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| 324 | |
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| 325 | if ((temp = inb_p(SMBHSTSTS)) != 0x00) { |
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| 326 | #ifdef DEBUG |
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| 327 | printk |
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| 328 | ("i2c-osb4.o: Failed reset at end of transaction (%02x)\n", |
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| 329 | temp); |
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| 330 | #endif |
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| 331 | } |
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| 332 | #ifdef DEBUG |
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| 333 | printk |
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| 334 | ("i2c-osb4.o: Transaction (post): CNT=%02x, CMD=%02x, ADD=%02x, " |
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| 335 | "DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), |
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| 336 | inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); |
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| 337 | #endif |
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| 338 | return result; |
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| 339 | } |
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| 340 | |
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| 341 | /* Return -1 on error. See smbus.h for more information */ |
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| 342 | s32 osb4_access(struct i2c_adapter * adap, u16 addr, |
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| 343 | unsigned short flags, char read_write, |
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| 344 | u8 command, int size, union i2c_smbus_data * data) |
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| 345 | { |
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| 346 | int i, len; |
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| 347 | |
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| 348 | switch (size) { |
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| 349 | case I2C_SMBUS_PROC_CALL: |
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| 350 | printk |
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| 351 | ("i2c-osb4.o: I2C_SMBUS_PROC_CALL not supported!\n"); |
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| 352 | return -1; |
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| 353 | case I2C_SMBUS_QUICK: |
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| 354 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 355 | SMBHSTADD); |
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| 356 | size = OSB4_QUICK; |
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| 357 | break; |
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| 358 | case I2C_SMBUS_BYTE: |
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| 359 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 360 | SMBHSTADD); |
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| 361 | if (read_write == I2C_SMBUS_WRITE) |
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| 362 | outb_p(command, SMBHSTCMD); |
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| 363 | size = OSB4_BYTE; |
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| 364 | break; |
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| 365 | case I2C_SMBUS_BYTE_DATA: |
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| 366 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 367 | SMBHSTADD); |
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| 368 | outb_p(command, SMBHSTCMD); |
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| 369 | if (read_write == I2C_SMBUS_WRITE) |
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| 370 | outb_p(data->byte, SMBHSTDAT0); |
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| 371 | size = OSB4_BYTE_DATA; |
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| 372 | break; |
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| 373 | case I2C_SMBUS_WORD_DATA: |
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| 374 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 375 | SMBHSTADD); |
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| 376 | outb_p(command, SMBHSTCMD); |
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| 377 | if (read_write == I2C_SMBUS_WRITE) { |
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| 378 | outb_p(data->word & 0xff, SMBHSTDAT0); |
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| 379 | outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); |
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| 380 | } |
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| 381 | size = OSB4_WORD_DATA; |
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| 382 | break; |
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| 383 | case I2C_SMBUS_BLOCK_DATA: |
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| 384 | outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 385 | SMBHSTADD); |
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| 386 | outb_p(command, SMBHSTCMD); |
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| 387 | if (read_write == I2C_SMBUS_WRITE) { |
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| 388 | len = data->block[0]; |
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| 389 | if (len < 0) |
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| 390 | len = 0; |
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| 391 | if (len > 32) |
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| 392 | len = 32; |
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| 393 | outb_p(len, SMBHSTDAT0); |
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| 394 | i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ |
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| 395 | for (i = 1; i <= len; i++) |
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| 396 | outb_p(data->block[i], SMBBLKDAT); |
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| 397 | } |
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| 398 | size = OSB4_BLOCK_DATA; |
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| 399 | break; |
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| 400 | } |
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| 401 | |
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| 402 | outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT); |
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| 403 | |
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| 404 | if (osb4_transaction()) /* Error in transaction */ |
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| 405 | return -1; |
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| 406 | |
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| 407 | if ((read_write == I2C_SMBUS_WRITE) || (size == OSB4_QUICK)) |
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| 408 | return 0; |
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| 409 | |
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| 410 | |
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| 411 | switch (size) { |
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| 412 | case OSB4_BYTE: /* Where is the result put? I assume here it is in |
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| 413 | SMBHSTDAT0 but it might just as well be in the |
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| 414 | SMBHSTCMD. No clue in the docs */ |
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| 415 | |
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| 416 | data->byte = inb_p(SMBHSTDAT0); |
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| 417 | break; |
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| 418 | case OSB4_BYTE_DATA: |
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| 419 | data->byte = inb_p(SMBHSTDAT0); |
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| 420 | break; |
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| 421 | case OSB4_WORD_DATA: |
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| 422 | data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); |
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| 423 | break; |
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| 424 | case OSB4_BLOCK_DATA: |
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| 425 | data->block[0] = inb_p(SMBHSTDAT0); |
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| 426 | i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ |
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| 427 | for (i = 1; i <= data->block[0]; i++) |
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| 428 | data->block[i] = inb_p(SMBBLKDAT); |
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| 429 | break; |
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| 430 | } |
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| 431 | return 0; |
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| 432 | } |
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| 433 | |
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| 434 | void osb4_inc(struct i2c_adapter *adapter) |
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| 435 | { |
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| 436 | MOD_INC_USE_COUNT; |
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| 437 | } |
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| 438 | |
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| 439 | void osb4_dec(struct i2c_adapter *adapter) |
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| 440 | { |
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| 441 | |
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| 442 | MOD_DEC_USE_COUNT; |
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| 443 | } |
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| 444 | |
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| 445 | u32 osb4_func(struct i2c_adapter *adapter) |
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| 446 | { |
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| 447 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
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| 448 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
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| 449 | I2C_FUNC_SMBUS_BLOCK_DATA; |
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| 450 | } |
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| 451 | |
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| 452 | int __init i2c_osb4_init(void) |
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| 453 | { |
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| 454 | int res; |
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| 455 | printk("i2c-osb4.o version %s (%s)\n", LM_VERSION, LM_DATE); |
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| 456 | if (osb4_initialized) { |
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| 457 | printk |
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| 458 | ("i2c-osb4.o: Oops, osb4_init called a second time!\n"); |
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| 459 | return -EBUSY; |
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| 460 | } |
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| 461 | osb4_initialized = 0; |
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| 462 | if ((res = osb4_setup())) { |
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| 463 | printk |
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| 464 | ("i2c-osb4.o: OSB4 not detected, module not inserted.\n"); |
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| 465 | osb4_cleanup(); |
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| 466 | return res; |
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| 467 | } |
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| 468 | osb4_initialized++; |
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| 469 | sprintf(osb4_adapter.name, "SMBus OSB4 adapter at %04x", |
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| 470 | osb4_smba); |
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| 471 | if ((res = i2c_add_adapter(&osb4_adapter))) { |
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| 472 | printk |
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| 473 | ("i2c-osb4.o: Adapter registration failed, module not inserted.\n"); |
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| 474 | osb4_cleanup(); |
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| 475 | return res; |
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| 476 | } |
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| 477 | osb4_initialized++; |
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| 478 | printk("i2c-osb4.o: OSB4 bus detected and initialized\n"); |
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| 479 | return 0; |
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| 480 | } |
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| 481 | |
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| 482 | int __init osb4_cleanup(void) |
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| 483 | { |
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| 484 | int res; |
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| 485 | if (osb4_initialized >= 2) { |
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| 486 | if ((res = i2c_del_adapter(&osb4_adapter))) { |
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| 487 | printk |
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| 488 | ("i2c-osb4.o: i2c_del_adapter failed, module not removed\n"); |
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| 489 | return res; |
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| 490 | } else |
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| 491 | osb4_initialized--; |
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| 492 | } |
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| 493 | if (osb4_initialized >= 1) { |
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| 494 | release_region(osb4_smba, 8); |
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| 495 | osb4_initialized--; |
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| 496 | } |
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| 497 | return 0; |
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| 498 | } |
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| 499 | |
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| 500 | EXPORT_NO_SYMBOLS; |
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| 501 | |
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| 502 | #ifdef MODULE |
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| 503 | |
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| 504 | MODULE_AUTHOR("Steffen Persvold <sp@scali.no>, Philip Edelbrock <phil@netroedge.com>, and Frodo Looijaard <frodol@dds.nl>"); |
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| 505 | MODULE_DESCRIPTION("ServerWorks OSB4 SMBus driver"); |
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| 506 | |
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| 507 | int init_module(void) |
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| 508 | { |
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| 509 | return i2c_osb4_init(); |
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| 510 | } |
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| 511 | |
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| 512 | int cleanup_module(void) |
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| 513 | { |
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| 514 | return osb4_cleanup(); |
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| 515 | } |
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| 516 | |
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| 517 | #endif /* MODULE */ |
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