| 1 | /* |
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| 2 | amd756.c - Part of lm_sensors, Linux kernel modules for hardware |
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| 3 | monitoring |
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| 4 | |
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| 5 | Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org> |
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| 6 | |
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| 7 | Shamelessly ripped from i2c-piix4.c: |
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| 8 | |
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| 9 | Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and |
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| 10 | Philip Edelbrock <phil@netroedge.com> |
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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 | /* |
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| 28 | 2002-04-08: Added nForce support. (Csaba Halasz) |
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| 29 | 2002-10-03: Fixed nForce PnP I/O port. (Michael Steil) |
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| 30 | 2002-12-28: Rewritten into something that resembles a Linux driver (hch) |
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| 31 | 2003-11-29: Added back AMD8111 removed by the previous rewrite. |
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| 32 | (Philip Pokorny) |
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| 33 | 2004-02-15: Don't register driver to avoid driver conflicts. |
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| 34 | (Daniel Rune Jensen) |
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| 35 | */ |
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| 36 | |
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| 37 | /* |
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| 38 | Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce |
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| 39 | Note: we assume there can only be one device, with one SMBus interface. |
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| 40 | */ |
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| 41 | |
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| 42 | #include <linux/module.h> |
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| 43 | #include <linux/pci.h> |
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| 44 | #include <linux/kernel.h> |
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| 45 | #include <linux/stddef.h> |
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| 46 | #include <linux/sched.h> |
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| 47 | #include <linux/ioport.h> |
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| 48 | #include <linux/i2c.h> |
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| 49 | #include <linux/init.h> |
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| 50 | #include <asm/io.h> |
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| 51 | #include "version.h" |
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| 52 | |
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| 53 | #define DRV_NAME "i2c-amd756" |
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| 54 | |
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| 55 | /* AMD756 SMBus address offsets */ |
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| 56 | #define SMB_ADDR_OFFSET 0xE0 |
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| 57 | #define SMB_IOSIZE 16 |
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| 58 | #define SMB_GLOBAL_STATUS (0x0 + amd756_ioport) |
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| 59 | #define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport) |
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| 60 | #define SMB_HOST_ADDRESS (0x4 + amd756_ioport) |
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| 61 | #define SMB_HOST_DATA (0x6 + amd756_ioport) |
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| 62 | #define SMB_HOST_COMMAND (0x8 + amd756_ioport) |
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| 63 | #define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport) |
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| 64 | #define SMB_HAS_DATA (0xA + amd756_ioport) |
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| 65 | #define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport) |
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| 66 | #define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport) |
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| 67 | #define SMB_SNOOP_ADDRESS (0xF + amd756_ioport) |
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| 68 | |
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| 69 | /* PCI Address Constants */ |
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| 70 | |
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| 71 | /* address of I/O space */ |
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| 72 | #define SMBBA 0x058 /* mh */ |
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| 73 | #define SMBBANFORCE 0x014 |
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| 74 | |
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| 75 | /* general configuration */ |
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| 76 | #define SMBGCFG 0x041 /* mh */ |
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| 77 | |
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| 78 | /* silicon revision code */ |
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| 79 | #define SMBREV 0x008 |
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| 80 | |
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| 81 | /* Other settings */ |
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| 82 | #define MAX_TIMEOUT 500 |
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| 83 | |
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| 84 | /* AMD756 constants */ |
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| 85 | #define AMD756_QUICK 0x00 |
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| 86 | #define AMD756_BYTE 0x01 |
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| 87 | #define AMD756_BYTE_DATA 0x02 |
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| 88 | #define AMD756_WORD_DATA 0x03 |
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| 89 | #define AMD756_PROCESS_CALL 0x04 |
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| 90 | #define AMD756_BLOCK_DATA 0x05 |
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| 91 | |
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| 92 | |
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| 93 | static unsigned short amd756_ioport = 0; |
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| 94 | |
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| 95 | /* |
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| 96 | SMBUS event = I/O 28-29 bit 11 |
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| 97 | see E0 for the status bits and enabled in E2 |
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| 98 | |
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| 99 | */ |
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| 100 | |
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| 101 | #define GS_ABRT_STS (1 << 0) |
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| 102 | #define GS_COL_STS (1 << 1) |
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| 103 | #define GS_PRERR_STS (1 << 2) |
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| 104 | #define GS_HST_STS (1 << 3) |
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| 105 | #define GS_HCYC_STS (1 << 4) |
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| 106 | #define GS_TO_STS (1 << 5) |
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| 107 | #define GS_SMB_STS (1 << 11) |
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| 108 | |
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| 109 | #define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \ |
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| 110 | GS_HCYC_STS | GS_TO_STS ) |
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| 111 | |
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| 112 | #define GE_CYC_TYPE_MASK (7) |
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| 113 | #define GE_HOST_STC (1 << 3) |
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| 114 | #define GE_ABORT (1 << 5) |
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| 115 | |
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| 116 | |
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| 117 | static int amd756_transaction(void) |
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| 118 | { |
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| 119 | int temp; |
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| 120 | int result = 0; |
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| 121 | int timeout = 0; |
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| 122 | |
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| 123 | pr_debug(DRV_NAME |
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| 124 | ": Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n", |
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| 125 | inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE), |
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| 126 | inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA)); |
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| 127 | |
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| 128 | /* Make sure the SMBus host is ready to start transmitting */ |
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| 129 | if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) { |
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| 130 | pr_debug(DRV_NAME ": SMBus busy (%04x). Waiting...\n", temp); |
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| 131 | do { |
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| 132 | i2c_delay(1); |
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| 133 | temp = inw_p(SMB_GLOBAL_STATUS); |
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| 134 | } while ((temp & (GS_HST_STS | GS_SMB_STS)) && |
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| 135 | (timeout++ < MAX_TIMEOUT)); |
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| 136 | /* If the SMBus is still busy, we give up */ |
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| 137 | if (timeout >= MAX_TIMEOUT) { |
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| 138 | pr_debug(DRV_NAME ": Busy wait timeout (%04x)\n", temp); |
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| 139 | goto abort; |
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| 140 | } |
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| 141 | timeout = 0; |
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| 142 | } |
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| 143 | |
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| 144 | /* start the transaction by setting the start bit */ |
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| 145 | outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE); |
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| 146 | |
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| 147 | /* We will always wait for a fraction of a second! */ |
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| 148 | do { |
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| 149 | i2c_delay(1); |
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| 150 | temp = inw_p(SMB_GLOBAL_STATUS); |
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| 151 | } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT)); |
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| 152 | |
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| 153 | /* If the SMBus is still busy, we give up */ |
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| 154 | if (timeout >= MAX_TIMEOUT) { |
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| 155 | pr_debug(DRV_NAME ": Completion timeout!\n"); |
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| 156 | goto abort; |
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| 157 | } |
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| 158 | |
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| 159 | if (temp & GS_PRERR_STS) { |
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| 160 | result = -1; |
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| 161 | pr_debug(DRV_NAME ": SMBus Protocol error (no response)!\n"); |
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| 162 | } |
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| 163 | |
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| 164 | if (temp & GS_COL_STS) { |
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| 165 | result = -1; |
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| 166 | printk(KERN_WARNING DRV_NAME ": SMBus collision!\n"); |
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| 167 | } |
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| 168 | |
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| 169 | if (temp & GS_TO_STS) { |
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| 170 | result = -1; |
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| 171 | pr_debug(DRV_NAME ": SMBus protocol timeout!\n"); |
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| 172 | } |
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| 173 | |
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| 174 | if (temp & GS_HCYC_STS) |
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| 175 | pr_debug(DRV_NAME ": SMBus protocol success!\n"); |
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| 176 | |
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| 177 | outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); |
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| 178 | |
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| 179 | #ifdef DEBUG |
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| 180 | if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) { |
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| 181 | pr_debug(DRV_NAME |
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| 182 | ": Failed reset at end of transaction (%04x)\n", temp); |
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| 183 | } |
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| 184 | |
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| 185 | pr_debug(DRV_NAME |
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| 186 | ": Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n", |
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| 187 | inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE), |
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| 188 | inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA)); |
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| 189 | #endif |
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| 190 | |
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| 191 | return result; |
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| 192 | |
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| 193 | abort: |
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| 194 | printk(KERN_WARNING DRV_NAME ": Sending abort.\n"); |
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| 195 | outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE); |
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| 196 | i2c_delay(100); |
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| 197 | outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); |
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| 198 | return -1; |
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| 199 | } |
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| 200 | |
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| 201 | /* Return -1 on error. */ |
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| 202 | |
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| 203 | static s32 amd756_access(struct i2c_adapter * adap, u16 addr, |
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| 204 | unsigned short flags, char read_write, |
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| 205 | u8 command, int size, union i2c_smbus_data * data) |
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| 206 | { |
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| 207 | int i, len; |
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| 208 | |
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| 209 | /** TODO: Should I supporte the 10-bit transfers? */ |
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| 210 | switch (size) { |
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| 211 | /* TODO: proc call is supported, I'm just not sure what to do here... */ |
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| 212 | case I2C_SMBUS_QUICK: |
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| 213 | outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 214 | SMB_HOST_ADDRESS); |
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| 215 | size = AMD756_QUICK; |
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| 216 | break; |
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| 217 | case I2C_SMBUS_BYTE: |
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| 218 | outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 219 | SMB_HOST_ADDRESS); |
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| 220 | if (read_write == I2C_SMBUS_WRITE) |
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| 221 | outb_p(command, SMB_HOST_DATA); |
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| 222 | size = AMD756_BYTE; |
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| 223 | break; |
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| 224 | case I2C_SMBUS_BYTE_DATA: |
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| 225 | outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 226 | SMB_HOST_ADDRESS); |
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| 227 | outb_p(command, SMB_HOST_COMMAND); |
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| 228 | if (read_write == I2C_SMBUS_WRITE) |
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| 229 | outw_p(data->byte, SMB_HOST_DATA); |
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| 230 | size = AMD756_BYTE_DATA; |
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| 231 | break; |
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| 232 | case I2C_SMBUS_WORD_DATA: |
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| 233 | outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 234 | SMB_HOST_ADDRESS); |
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| 235 | outb_p(command, SMB_HOST_COMMAND); |
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| 236 | if (read_write == I2C_SMBUS_WRITE) |
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| 237 | outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */ |
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| 238 | size = AMD756_WORD_DATA; |
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| 239 | break; |
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| 240 | case I2C_SMBUS_BLOCK_DATA: |
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| 241 | outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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| 242 | SMB_HOST_ADDRESS); |
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| 243 | outb_p(command, SMB_HOST_COMMAND); |
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| 244 | if (read_write == I2C_SMBUS_WRITE) { |
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| 245 | len = data->block[0]; |
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| 246 | if (len < 0) |
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| 247 | len = 0; |
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| 248 | if (len > 32) |
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| 249 | len = 32; |
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| 250 | outw_p(len, SMB_HOST_DATA); |
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| 251 | /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ |
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| 252 | for (i = 1; i <= len; i++) |
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| 253 | outb_p(data->block[i], |
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| 254 | SMB_HOST_BLOCK_DATA); |
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| 255 | } |
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| 256 | size = AMD756_BLOCK_DATA; |
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| 257 | break; |
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| 258 | default: |
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| 259 | printk |
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| 260 | (KERN_WARNING "i2c-amd756.o: Unsupported transaction %d\n", size); |
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| 261 | return -1; |
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| 262 | } |
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| 263 | |
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| 264 | /* How about enabling interrupts... */ |
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| 265 | outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE); |
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| 266 | |
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| 267 | if (amd756_transaction()) /* Error in transaction */ |
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| 268 | return -1; |
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| 269 | |
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| 270 | if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK)) |
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| 271 | return 0; |
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| 272 | |
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| 273 | |
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| 274 | switch (size) { |
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| 275 | case AMD756_BYTE: |
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| 276 | data->byte = inw_p(SMB_HOST_DATA); |
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| 277 | break; |
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| 278 | case AMD756_BYTE_DATA: |
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| 279 | data->byte = inw_p(SMB_HOST_DATA); |
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| 280 | break; |
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| 281 | case AMD756_WORD_DATA: |
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| 282 | data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */ |
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| 283 | break; |
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| 284 | case AMD756_BLOCK_DATA: |
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| 285 | data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f; |
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| 286 | if(data->block[0] > 32) |
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| 287 | data->block[0] = 32; |
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| 288 | /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ |
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| 289 | for (i = 1; i <= data->block[0]; i++) |
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| 290 | data->block[i] = inb_p(SMB_HOST_BLOCK_DATA); |
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| 291 | break; |
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| 292 | } |
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| 293 | |
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| 294 | return 0; |
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| 295 | } |
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| 296 | |
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| 297 | static void amd756_inc(struct i2c_adapter *adapter) |
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| 298 | { |
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| 299 | #ifdef MODULE |
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| 300 | MOD_INC_USE_COUNT; |
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| 301 | #endif |
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| 302 | } |
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| 303 | |
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| 304 | static void amd756_dec(struct i2c_adapter *adapter) |
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| 305 | { |
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| 306 | #ifdef MODULE |
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| 307 | MOD_DEC_USE_COUNT; |
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| 308 | #endif |
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| 309 | } |
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| 310 | |
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| 311 | static u32 amd756_func(struct i2c_adapter *adapter) |
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| 312 | { |
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| 313 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
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| 314 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
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| 315 | I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_PROC_CALL; |
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| 316 | } |
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| 317 | |
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| 318 | static struct i2c_algorithm smbus_algorithm = { |
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| 319 | .name = "Non-I2C SMBus adapter", |
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| 320 | .id = I2C_ALGO_SMBUS, |
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| 321 | .smbus_xfer = amd756_access, |
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| 322 | .functionality = amd756_func, |
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| 323 | }; |
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| 324 | |
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| 325 | struct i2c_adapter amd756_smbus = { |
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| 326 | .id = I2C_ALGO_SMBUS | I2C_HW_SMBUS_AMD756, |
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| 327 | .algo = &smbus_algorithm, |
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| 328 | .inc_use = amd756_inc, |
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| 329 | .dec_use = amd756_dec, |
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| 330 | }; |
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| 331 | |
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| 332 | enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 }; |
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| 333 | static const char* chipname[] = { |
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| 334 | "AMD756", "AMD766", "AMD768", |
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| 335 | "nVidia nForce", "AMD8111", |
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| 336 | }; |
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| 337 | |
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| 338 | static struct pci_device_id amd756_ids[] __devinitdata = { |
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| 339 | {PCI_VENDOR_ID_AMD, 0x740B, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD756 }, |
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| 340 | {PCI_VENDOR_ID_AMD, 0x7413, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD766 }, |
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| 341 | {PCI_VENDOR_ID_AMD, 0x7443, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD768 }, |
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| 342 | {PCI_VENDOR_ID_AMD, 0x746B, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD8111 }, |
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| 343 | {PCI_VENDOR_ID_NVIDIA, 0x01B4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, NFORCE }, |
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| 344 | { 0, } |
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| 345 | }; |
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| 346 | |
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| 347 | static int __devinit amd756_probe(struct pci_dev *pdev, |
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| 348 | const struct pci_device_id *id) |
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| 349 | { |
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| 350 | int nforce = (id->driver_data == NFORCE); |
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| 351 | int error; |
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| 352 | u8 temp; |
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| 353 | |
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| 354 | if (amd756_ioport) { |
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| 355 | printk(KERN_ERR DRV_NAME ": Only one device supported. " |
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| 356 | "(you have a strange motherboard, btw..)\n"); |
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| 357 | return -ENODEV; |
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| 358 | } |
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| 359 | |
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| 360 | if (nforce) { |
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| 361 | if (PCI_FUNC(pdev->devfn) != 1) |
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| 362 | return -ENODEV; |
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| 363 | |
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| 364 | pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport); |
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| 365 | amd756_ioport &= 0xfffc; |
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| 366 | } else { /* amd */ |
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| 367 | if (PCI_FUNC(pdev->devfn) != 3) |
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| 368 | return -ENODEV; |
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| 369 | |
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| 370 | pci_read_config_byte(pdev, SMBGCFG, &temp); |
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| 371 | if ((temp & 128) == 0) { |
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| 372 | printk(KERN_ERR DRV_NAME |
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| 373 | ": Error: SMBus controller I/O not enabled!\n"); |
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| 374 | return -ENODEV; |
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| 375 | } |
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| 376 | |
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| 377 | /* Determine the address of the SMBus areas */ |
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| 378 | /* Technically it is a dword but... */ |
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| 379 | pci_read_config_word(pdev, SMBBA, &amd756_ioport); |
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| 380 | amd756_ioport &= 0xff00; |
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| 381 | amd756_ioport += SMB_ADDR_OFFSET; |
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| 382 | } |
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| 383 | |
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| 384 | if (!request_region(amd756_ioport, SMB_IOSIZE, "amd756-smbus")) { |
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| 385 | printk(KERN_ERR DRV_NAME |
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| 386 | ": SMB region 0x%x already in use!\n", amd756_ioport); |
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| 387 | return -ENODEV; |
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| 388 | } |
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| 389 | |
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| 390 | #ifdef DEBUG |
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| 391 | pci_read_config_byte(pdev, SMBREV, &temp); |
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| 392 | printk(KERN_DEBUG DRV_NAME ": SMBREV = 0x%X\n", temp); |
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| 393 | printk(KERN_DEBUG DRV_NAME ": AMD756_smba = 0x%X\n", amd756_ioport); |
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| 394 | #endif |
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| 395 | |
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| 396 | sprintf(amd756_smbus.name, "SMBus %s adapter at %04x", |
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| 397 | chipname[id->driver_data], amd756_ioport); |
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| 398 | |
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| 399 | error = i2c_add_adapter(&amd756_smbus); |
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| 400 | if (error) { |
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| 401 | printk(KERN_ERR DRV_NAME |
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| 402 | ": Adapter registration failed, module not inserted.\n"); |
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| 403 | goto out_err; |
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| 404 | } |
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| 405 | |
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| 406 | return 0; |
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| 407 | |
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| 408 | out_err: |
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| 409 | release_region(amd756_ioport, SMB_IOSIZE); |
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| 410 | return error; |
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| 411 | } |
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| 412 | |
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| 413 | |
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| 414 | static int __init i2c_amd756_init(void) |
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| 415 | { |
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| 416 | struct pci_dev *dev; |
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| 417 | const struct pci_device_id *id; |
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| 418 | |
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| 419 | printk(KERN_INFO "i2c-amd756.o version %s (%s)\n", LM_VERSION, LM_DATE); |
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| 420 | |
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| 421 | pci_for_each_dev(dev) { |
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| 422 | id = pci_match_device(amd756_ids, dev); |
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| 423 | if (id && amd756_probe(dev, id) >= 0) |
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| 424 | return 0; |
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| 425 | } |
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| 426 | |
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| 427 | return -ENODEV; |
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| 428 | } |
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| 429 | |
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| 430 | |
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| 431 | static void __exit i2c_amd756_exit(void) |
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| 432 | { |
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| 433 | i2c_del_adapter(&amd756_smbus); |
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| 434 | release_region(amd756_ioport, SMB_IOSIZE); |
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| 435 | } |
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| 436 | |
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| 437 | MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>"); |
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| 438 | MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver"); |
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| 439 | MODULE_LICENSE("GPL"); |
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| 440 | |
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| 441 | EXPORT_SYMBOL(amd756_smbus); |
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| 442 | |
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| 443 | module_init(i2c_amd756_init) |
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| 444 | module_exit(i2c_amd756_exit) |
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