| 1 | /* |
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| 2 | i2c-savage4.c - Part of lm_sensors, Linux kernel modules for hardware |
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| 3 | monitoring |
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| 4 | Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>, |
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| 5 | Philip Edelbrock <phil@netroedge.com>, |
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| 6 | Ralph Metzler <rjkm@thp.uni-koeln.de>, and |
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| 7 | Mark D. Studebaker <mdsxyz123@yahoo.com> |
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| 8 | |
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| 9 | Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and |
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| 10 | Simon Vogl |
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| 11 | |
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| 12 | This program is free software; you can redistribute it and/or modify |
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| 13 | it under the terms of the GNU General Public License as published by |
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| 14 | the Free Software Foundation; either version 2 of the License, or |
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| 15 | (at your option) any later version. |
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| 16 | |
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| 17 | This program is distributed in the hope that it will be useful, |
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| 18 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 20 | GNU General Public License for more details. |
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| 21 | |
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| 22 | You should have received a copy of the GNU General Public License |
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| 23 | along with this program; if not, write to the Free Software |
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| 24 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 25 | */ |
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| 26 | |
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| 27 | /* This interfaces to the I2C bus of the Savage4 to gain access to |
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| 28 | the BT869 and possibly other I2C devices. The DDC bus is not |
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| 29 | yet supported because its register is not memory-mapped. |
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| 30 | However we leave the DDC code here, commented out, to make |
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| 31 | it easier to add later. */ |
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| 32 | |
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| 33 | #include <linux/version.h> |
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| 34 | #include <linux/module.h> |
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| 35 | #include <linux/pci.h> |
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| 36 | #include <asm/io.h> |
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| 37 | #include <linux/i2c.h> |
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| 38 | #include <linux/i2c-algo-bit.h> |
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| 39 | #include "version.h" |
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| 40 | #include <linux/init.h> |
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| 41 | |
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| 42 | #ifdef MODULE_LICENSE |
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| 43 | MODULE_LICENSE("GPL"); |
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| 44 | #endif |
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| 45 | |
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| 46 | /* 3DFX defines */ |
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| 47 | /* #define PCI_VENDOR_ID_S3 0x5333 */ |
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| 48 | #define PCI_CHIP_SAVAGE3D 0x8A20 |
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| 49 | #define PCI_CHIP_SAVAGE3D_MV 0x8A21 |
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| 50 | #define PCI_CHIP_SAVAGE4 0x8A22 |
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| 51 | #define PCI_CHIP_SAVAGE2000 0x9102 |
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| 52 | #define PCI_CHIP_PROSAVAGE_PM 0x8A25 |
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| 53 | #define PCI_CHIP_PROSAVAGE_KM 0x8A26 |
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| 54 | #define PCI_CHIP_SAVAGE_MX_MV 0x8c10 |
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| 55 | #define PCI_CHIP_SAVAGE_MX 0x8c11 |
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| 56 | #define PCI_CHIP_SAVAGE_IX_MV 0x8c12 |
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| 57 | #define PCI_CHIP_SAVAGE_IX 0x8c13 |
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| 58 | |
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| 59 | /* the only registers we use */ |
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| 60 | //#define REG 0x78 |
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| 61 | //#define REG2 0x70 |
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| 62 | #define REG 0xff20 /* Serial Port 1 Register */ |
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| 63 | |
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| 64 | /* bit locations in the register */ |
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| 65 | //#define DDC_ENAB 0x00040000 |
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| 66 | //#define DDC_SCL_OUT 0x00080000 |
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| 67 | //#define DDC_SDA_OUT 0x00100000 |
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| 68 | //#define DDC_SCL_IN 0x00200000 |
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| 69 | //#define DDC_SDA_IN 0x00400000 |
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| 70 | #define I2C_ENAB 0x00000020 |
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| 71 | #define I2C_SCL_OUT 0x00000001 |
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| 72 | #define I2C_SDA_OUT 0x00000002 |
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| 73 | #define I2C_SCL_IN 0x00000008 |
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| 74 | #define I2C_SDA_IN 0x00000010 |
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| 75 | |
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| 76 | /* initialization states */ |
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| 77 | #define INIT2 0x20 |
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| 78 | /* #define INIT3 0x4 */ |
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| 79 | |
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| 80 | /* delays */ |
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| 81 | #define CYCLE_DELAY 10 |
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| 82 | #define TIMEOUT 50 |
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| 83 | |
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| 84 | #ifdef MODULE |
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| 85 | static |
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| 86 | #else |
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| 87 | extern |
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| 88 | #endif |
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| 89 | int __init i2c_savage4_init(void); |
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| 90 | static int __init savage4_cleanup(void); |
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| 91 | static int savage4_setup(void); |
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| 92 | static void config_s4(struct pci_dev *dev); |
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| 93 | static void savage4_inc(struct i2c_adapter *adapter); |
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| 94 | static void savage4_dec(struct i2c_adapter *adapter); |
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| 95 | |
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| 96 | #ifdef MODULE |
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| 97 | extern int init_module(void); |
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| 98 | extern int cleanup_module(void); |
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| 99 | #endif /* MODULE */ |
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| 100 | |
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| 101 | |
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| 102 | static int __initdata savage4_initialized; |
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| 103 | static unsigned char *mem; |
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| 104 | |
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| 105 | extern inline void outlong(unsigned int dat) |
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| 106 | { |
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| 107 | *((unsigned int *) (mem + REG)) = dat; |
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| 108 | } |
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| 109 | |
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| 110 | extern inline unsigned int readlong(void) |
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| 111 | { |
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| 112 | return *((unsigned int *) (mem + REG)); |
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| 113 | } |
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| 114 | |
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| 115 | /* The sav GPIO registers don't have individual masks for each bit |
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| 116 | so we always have to read before writing. */ |
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| 117 | |
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| 118 | static void bit_savi2c_setscl(void *data, int val) |
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| 119 | { |
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| 120 | unsigned int r; |
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| 121 | r = readlong(); |
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| 122 | if(val) |
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| 123 | r |= I2C_SCL_OUT; |
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| 124 | else |
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| 125 | r &= ~I2C_SCL_OUT; |
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| 126 | outlong(r); |
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| 127 | } |
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| 128 | |
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| 129 | static void bit_savi2c_setsda(void *data, int val) |
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| 130 | { |
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| 131 | unsigned int r; |
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| 132 | r = readlong(); |
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| 133 | if(val) |
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| 134 | r |= I2C_SDA_OUT; |
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| 135 | else |
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| 136 | r &= ~I2C_SDA_OUT; |
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| 137 | outlong(r); |
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| 138 | } |
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| 139 | |
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| 140 | /* The GPIO pins are open drain, so the pins always remain outputs. |
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| 141 | We rely on the i2c-algo-bit routines to set the pins high before |
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| 142 | reading the input from other chips. */ |
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| 143 | |
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| 144 | static int bit_savi2c_getscl(void *data) |
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| 145 | { |
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| 146 | return (0 != (readlong() & I2C_SCL_IN)); |
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| 147 | } |
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| 148 | |
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| 149 | static int bit_savi2c_getsda(void *data) |
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| 150 | { |
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| 151 | return (0 != (readlong() & I2C_SDA_IN)); |
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| 152 | } |
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| 153 | |
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| 154 | /*static void bit_savddc_setscl(void *data, int val) |
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| 155 | { |
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| 156 | unsigned int r; |
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| 157 | r = readlong(); |
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| 158 | if(val) |
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| 159 | r |= DDC_SCL_OUT; |
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| 160 | else |
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| 161 | r &= ~DDC_SCL_OUT; |
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| 162 | outlong(r); |
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| 163 | } |
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| 164 | |
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| 165 | static void bit_savddc_setsda(void *data, int val) |
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| 166 | { |
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| 167 | unsigned int r; |
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| 168 | r = readlong(); |
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| 169 | if(val) |
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| 170 | r |= DDC_SDA_OUT; |
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| 171 | else |
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| 172 | r &= ~DDC_SDA_OUT; |
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| 173 | outlong(r); |
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| 174 | } |
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| 175 | |
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| 176 | static int bit_savddc_getscl(void *data) |
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| 177 | { |
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| 178 | return (0 != (readlong() & DDC_SCL_IN)); |
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| 179 | } |
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| 180 | |
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| 181 | static int bit_savddc_getsda(void *data) |
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| 182 | { |
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| 183 | return (0 != (readlong() & DDC_SDA_IN)); |
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| 184 | } |
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| 185 | */ |
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| 186 | static struct i2c_algo_bit_data sav_i2c_bit_data = { |
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| 187 | NULL, |
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| 188 | bit_savi2c_setsda, |
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| 189 | bit_savi2c_setscl, |
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| 190 | bit_savi2c_getsda, |
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| 191 | bit_savi2c_getscl, |
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| 192 | CYCLE_DELAY, CYCLE_DELAY, TIMEOUT |
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| 193 | }; |
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| 194 | |
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| 195 | static struct i2c_adapter savage4_i2c_adapter = { |
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| 196 | "I2C Savage4 adapter", |
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| 197 | I2C_HW_B_VOO, |
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| 198 | NULL, |
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| 199 | &sav_i2c_bit_data, |
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| 200 | savage4_inc, |
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| 201 | savage4_dec, |
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| 202 | NULL, |
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| 203 | NULL, |
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| 204 | }; |
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| 205 | /* |
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| 206 | static struct i2c_algo_bit_data sav_ddc_bit_data = { |
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| 207 | NULL, |
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| 208 | bit_savddc_setsda, |
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| 209 | bit_savddc_setscl, |
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| 210 | bit_savddc_getsda, |
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| 211 | bit_savddc_getscl, |
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| 212 | CYCLE_DELAY, CYCLE_DELAY, TIMEOUT |
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| 213 | }; |
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| 214 | |
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| 215 | static struct i2c_adapter savage4_ddc_adapter = { |
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| 216 | "DDC Voodoo3/Banshee adapter", |
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| 217 | I2C_HW_B_VOO, |
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| 218 | NULL, |
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| 219 | &sav_ddc_bit_data, |
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| 220 | savage4_inc, |
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| 221 | savage4_dec, |
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| 222 | NULL, |
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| 223 | NULL, |
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| 224 | }; |
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| 225 | */ |
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| 226 | /* Configures the chip */ |
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| 227 | |
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| 228 | void config_s4(struct pci_dev *dev) |
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| 229 | { |
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| 230 | unsigned int cadr; |
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| 231 | |
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| 232 | /* map memory */ |
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| 233 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,13) |
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| 234 | cadr = dev->resource[0].start; |
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| 235 | #else |
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| 236 | cadr = dev->base_address[0]; |
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| 237 | #endif |
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| 238 | cadr &= PCI_BASE_ADDRESS_MEM_MASK; |
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| 239 | mem = ioremap_nocache(cadr, 0x0080000); |
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| 240 | |
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| 241 | // *((unsigned int *) (mem + REG2)) = 0x8160; |
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| 242 | *((unsigned int *) (mem + REG)) = 0x00000020; |
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| 243 | printk("i2c-savage4: Using Savage4 at 0x%p\n", mem); |
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| 244 | } |
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| 245 | |
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| 246 | /* Detect chip and initialize it. */ |
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| 247 | static int savage4_setup(void) |
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| 248 | { |
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| 249 | struct pci_dev *dev; |
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| 250 | int s4_num; |
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| 251 | |
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| 252 | s4_num = 0; |
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| 253 | |
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| 254 | dev = NULL; |
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| 255 | do { |
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| 256 | if ((dev = pci_find_device(PCI_VENDOR_ID_S3, |
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| 257 | PCI_CHIP_SAVAGE4, |
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| 258 | dev))) { |
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| 259 | if (!s4_num) |
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| 260 | config_s4(dev); |
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| 261 | s4_num++; |
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| 262 | } |
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| 263 | } while (dev); |
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| 264 | |
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| 265 | dev = NULL; |
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| 266 | do { |
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| 267 | if ((dev = pci_find_device(PCI_VENDOR_ID_S3, |
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| 268 | PCI_CHIP_SAVAGE2000, |
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| 269 | dev))) { |
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| 270 | if (!s4_num) |
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| 271 | config_s4(dev); |
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| 272 | s4_num++; |
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| 273 | } |
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| 274 | } while (dev); |
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| 275 | |
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| 276 | if (s4_num > 0) { |
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| 277 | printk("i2c-savage4: %d Savage4 found.\n", s4_num); |
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| 278 | if (s4_num > 1) |
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| 279 | printk("i2c-savage4: warning: only 1 supported.\n"); |
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| 280 | return 0; |
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| 281 | } else { |
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| 282 | printk("i2c-savage4: No Savage4 found.\n"); |
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| 283 | return -ENODEV; |
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| 284 | } |
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| 285 | } |
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| 286 | |
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| 287 | void savage4_inc(struct i2c_adapter *adapter) |
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| 288 | { |
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| 289 | MOD_INC_USE_COUNT; |
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| 290 | } |
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| 291 | |
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| 292 | void savage4_dec(struct i2c_adapter *adapter) |
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| 293 | { |
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| 294 | MOD_DEC_USE_COUNT; |
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| 295 | } |
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| 296 | |
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| 297 | int __init i2c_savage4_init(void) |
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| 298 | { |
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| 299 | int res; |
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| 300 | printk("i2c-savage4.o version %s (%s)\n", LM_VERSION, LM_DATE); |
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| 301 | savage4_initialized = 0; |
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| 302 | if ((res = savage4_setup())) { |
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| 303 | printk |
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| 304 | ("i2c-savage4.o: Savage4 not detected, module not inserted.\n"); |
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| 305 | savage4_cleanup(); |
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| 306 | return res; |
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| 307 | } |
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| 308 | if ((res = i2c_bit_add_bus(&savage4_i2c_adapter))) { |
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| 309 | printk("i2c-savage4.o: I2C adapter registration failed\n"); |
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| 310 | } else { |
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| 311 | printk("i2c-savage4.o: I2C bus initialized\n"); |
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| 312 | savage4_initialized |= INIT2; |
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| 313 | } |
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| 314 | /* |
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| 315 | if ((res = i2c_bit_add_bus(&savage4_ddc_adapter))) { |
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| 316 | printk("i2c-savage4.o: DDC adapter registration failed\n"); |
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| 317 | } else { |
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| 318 | printk("i2c-savage4.o: DDC bus initialized\n"); |
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| 319 | savage4_initialized |= INIT3; |
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| 320 | } |
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| 321 | */ |
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| 322 | if(!(savage4_initialized & (INIT2 /* | INIT3 */ ))) { |
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| 323 | printk("i2c-savage4.o: Both registrations failed, module not inserted\n"); |
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| 324 | savage4_cleanup(); |
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| 325 | return res; |
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| 326 | } |
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| 327 | return 0; |
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| 328 | } |
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| 329 | |
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| 330 | int __init savage4_cleanup(void) |
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| 331 | { |
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| 332 | int res; |
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| 333 | |
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| 334 | iounmap(mem); |
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| 335 | /* |
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| 336 | if (savage4_initialized & INIT3) { |
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| 337 | if ((res = i2c_bit_del_bus(&savage4_ddc_adapter))) { |
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| 338 | printk |
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| 339 | ("i2c-savage4.o: i2c_bit_del_bus failed, module not removed\n"); |
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| 340 | return res; |
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| 341 | } |
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| 342 | } |
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| 343 | */ |
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| 344 | if (savage4_initialized & INIT2) { |
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| 345 | if ((res = i2c_bit_del_bus(&savage4_i2c_adapter))) { |
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| 346 | printk |
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| 347 | ("i2c-savage4.o: i2c_bit_del_bus failed, module not removed\n"); |
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| 348 | return res; |
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| 349 | } |
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| 350 | } |
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| 351 | return 0; |
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| 352 | } |
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| 353 | |
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| 354 | EXPORT_NO_SYMBOLS; |
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| 355 | |
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| 356 | #ifdef MODULE |
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| 357 | |
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| 358 | MODULE_AUTHOR |
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| 359 | ("Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock <phil@netroedge.com>, Ralph Metzler <rjkm@thp.uni-koeln.de>, and Mark D. Studebaker <mdsxyz123@yahoo.com>"); |
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| 360 | MODULE_DESCRIPTION("Savage4 I2C/SMBus driver"); |
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| 361 | |
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| 362 | |
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| 363 | int init_module(void) |
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| 364 | { |
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| 365 | return i2c_savage4_init(); |
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| 366 | } |
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| 367 | |
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| 368 | int cleanup_module(void) |
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| 369 | { |
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| 370 | return savage4_cleanup(); |
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| 371 | } |
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| 372 | |
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| 373 | #endif /* MODULE */ |
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