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402 lines
10 KiB
402 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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Copyright (c) 1999-2002 Merlin Hughes <[email protected]> |
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Shamelessly ripped from i2c-piix4.c: |
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Copyright (c) 1998, 1999 Frodo Looijaard <[email protected]> and |
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Philip Edelbrock <[email protected]> |
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*/ |
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/* |
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2002-04-08: Added nForce support. (Csaba Halasz) |
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2002-10-03: Fixed nForce PnP I/O port. (Michael Steil) |
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2002-12-28: Rewritten into something that resembles a Linux driver (hch) |
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2003-11-29: Added back AMD8111 removed by the previous rewrite. |
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(Philip Pokorny) |
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*/ |
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/* |
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Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce |
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Note: we assume there can only be one device, with one SMBus interface. |
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*/ |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <linux/stddef.h> |
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#include <linux/ioport.h> |
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#include <linux/i2c.h> |
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#include <linux/acpi.h> |
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#include <linux/io.h> |
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/* AMD756 SMBus address offsets */ |
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#define SMB_ADDR_OFFSET 0xE0 |
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#define SMB_IOSIZE 16 |
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#define SMB_GLOBAL_STATUS (0x0 + amd756_ioport) |
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#define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport) |
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#define SMB_HOST_ADDRESS (0x4 + amd756_ioport) |
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#define SMB_HOST_DATA (0x6 + amd756_ioport) |
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#define SMB_HOST_COMMAND (0x8 + amd756_ioport) |
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#define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport) |
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#define SMB_HAS_DATA (0xA + amd756_ioport) |
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#define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport) |
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#define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport) |
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#define SMB_SNOOP_ADDRESS (0xF + amd756_ioport) |
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/* PCI Address Constants */ |
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/* address of I/O space */ |
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#define SMBBA 0x058 /* mh */ |
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#define SMBBANFORCE 0x014 |
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/* general configuration */ |
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#define SMBGCFG 0x041 /* mh */ |
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/* silicon revision code */ |
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#define SMBREV 0x008 |
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/* Other settings */ |
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#define MAX_TIMEOUT 500 |
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/* AMD756 constants */ |
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#define AMD756_QUICK 0x00 |
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#define AMD756_BYTE 0x01 |
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#define AMD756_BYTE_DATA 0x02 |
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#define AMD756_WORD_DATA 0x03 |
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#define AMD756_PROCESS_CALL 0x04 |
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#define AMD756_BLOCK_DATA 0x05 |
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static struct pci_driver amd756_driver; |
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static unsigned short amd756_ioport; |
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/* |
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SMBUS event = I/O 28-29 bit 11 |
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see E0 for the status bits and enabled in E2 |
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*/ |
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#define GS_ABRT_STS (1 << 0) |
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#define GS_COL_STS (1 << 1) |
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#define GS_PRERR_STS (1 << 2) |
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#define GS_HST_STS (1 << 3) |
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#define GS_HCYC_STS (1 << 4) |
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#define GS_TO_STS (1 << 5) |
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#define GS_SMB_STS (1 << 11) |
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#define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \ |
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GS_HCYC_STS | GS_TO_STS ) |
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#define GE_CYC_TYPE_MASK (7) |
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#define GE_HOST_STC (1 << 3) |
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#define GE_ABORT (1 << 5) |
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static int amd756_transaction(struct i2c_adapter *adap) |
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{ |
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int temp; |
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int result = 0; |
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int timeout = 0; |
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dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, " |
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"DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS), |
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inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS), |
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inb_p(SMB_HOST_DATA)); |
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/* Make sure the SMBus host is ready to start transmitting */ |
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if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) { |
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dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp); |
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do { |
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msleep(1); |
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temp = inw_p(SMB_GLOBAL_STATUS); |
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} while ((temp & (GS_HST_STS | GS_SMB_STS)) && |
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(timeout++ < MAX_TIMEOUT)); |
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/* If the SMBus is still busy, we give up */ |
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if (timeout > MAX_TIMEOUT) { |
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dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp); |
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goto abort; |
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} |
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timeout = 0; |
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} |
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/* start the transaction by setting the start bit */ |
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outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE); |
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/* We will always wait for a fraction of a second! */ |
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do { |
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msleep(1); |
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temp = inw_p(SMB_GLOBAL_STATUS); |
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} while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT)); |
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/* If the SMBus is still busy, we give up */ |
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if (timeout > MAX_TIMEOUT) { |
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dev_dbg(&adap->dev, "Completion timeout!\n"); |
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goto abort; |
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} |
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if (temp & GS_PRERR_STS) { |
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result = -ENXIO; |
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dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n"); |
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} |
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if (temp & GS_COL_STS) { |
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result = -EIO; |
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dev_warn(&adap->dev, "SMBus collision!\n"); |
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} |
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if (temp & GS_TO_STS) { |
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result = -ETIMEDOUT; |
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dev_dbg(&adap->dev, "SMBus protocol timeout!\n"); |
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} |
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if (temp & GS_HCYC_STS) |
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dev_dbg(&adap->dev, "SMBus protocol success!\n"); |
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outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); |
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#ifdef DEBUG |
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if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) { |
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dev_dbg(&adap->dev, |
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"Failed reset at end of transaction (%04x)\n", temp); |
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} |
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#endif |
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dev_dbg(&adap->dev, |
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"Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n", |
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inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE), |
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inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA)); |
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return result; |
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abort: |
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dev_warn(&adap->dev, "Sending abort\n"); |
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outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE); |
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msleep(100); |
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outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); |
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return -EIO; |
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} |
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/* Return negative errno on error. */ |
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static s32 amd756_access(struct i2c_adapter * adap, u16 addr, |
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unsigned short flags, char read_write, |
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u8 command, int size, union i2c_smbus_data * data) |
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{ |
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int i, len; |
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int status; |
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switch (size) { |
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case I2C_SMBUS_QUICK: |
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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SMB_HOST_ADDRESS); |
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size = AMD756_QUICK; |
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break; |
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case I2C_SMBUS_BYTE: |
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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SMB_HOST_ADDRESS); |
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if (read_write == I2C_SMBUS_WRITE) |
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outb_p(command, SMB_HOST_DATA); |
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size = AMD756_BYTE; |
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break; |
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case I2C_SMBUS_BYTE_DATA: |
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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SMB_HOST_ADDRESS); |
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outb_p(command, SMB_HOST_COMMAND); |
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if (read_write == I2C_SMBUS_WRITE) |
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outw_p(data->byte, SMB_HOST_DATA); |
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size = AMD756_BYTE_DATA; |
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break; |
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case I2C_SMBUS_WORD_DATA: |
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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SMB_HOST_ADDRESS); |
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outb_p(command, SMB_HOST_COMMAND); |
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if (read_write == I2C_SMBUS_WRITE) |
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outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */ |
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size = AMD756_WORD_DATA; |
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break; |
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case I2C_SMBUS_BLOCK_DATA: |
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), |
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SMB_HOST_ADDRESS); |
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outb_p(command, SMB_HOST_COMMAND); |
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if (read_write == I2C_SMBUS_WRITE) { |
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len = data->block[0]; |
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if (len < 0) |
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len = 0; |
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if (len > 32) |
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len = 32; |
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outw_p(len, SMB_HOST_DATA); |
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/* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ |
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for (i = 1; i <= len; i++) |
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outb_p(data->block[i], |
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SMB_HOST_BLOCK_DATA); |
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} |
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size = AMD756_BLOCK_DATA; |
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break; |
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default: |
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dev_warn(&adap->dev, "Unsupported transaction %d\n", size); |
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return -EOPNOTSUPP; |
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} |
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/* How about enabling interrupts... */ |
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outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE); |
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status = amd756_transaction(adap); |
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if (status) |
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return status; |
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if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK)) |
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return 0; |
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switch (size) { |
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case AMD756_BYTE: |
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data->byte = inw_p(SMB_HOST_DATA); |
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break; |
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case AMD756_BYTE_DATA: |
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data->byte = inw_p(SMB_HOST_DATA); |
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break; |
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case AMD756_WORD_DATA: |
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data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */ |
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break; |
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case AMD756_BLOCK_DATA: |
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data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f; |
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if(data->block[0] > 32) |
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data->block[0] = 32; |
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/* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ |
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for (i = 1; i <= data->block[0]; i++) |
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data->block[i] = inb_p(SMB_HOST_BLOCK_DATA); |
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break; |
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} |
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return 0; |
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} |
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static u32 amd756_func(struct i2c_adapter *adapter) |
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{ |
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return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
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I2C_FUNC_SMBUS_BLOCK_DATA; |
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} |
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static const struct i2c_algorithm smbus_algorithm = { |
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.smbus_xfer = amd756_access, |
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.functionality = amd756_func, |
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}; |
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struct i2c_adapter amd756_smbus = { |
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.owner = THIS_MODULE, |
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.class = I2C_CLASS_HWMON | I2C_CLASS_SPD, |
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.algo = &smbus_algorithm, |
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}; |
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enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 }; |
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static const char* chipname[] = { |
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"AMD756", "AMD766", "AMD768", |
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"nVidia nForce", "AMD8111", |
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}; |
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static const struct pci_device_id amd756_ids[] = { |
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B), |
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.driver_data = AMD756 }, |
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413), |
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.driver_data = AMD766 }, |
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443), |
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.driver_data = AMD768 }, |
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS), |
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.driver_data = AMD8111 }, |
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{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS), |
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.driver_data = NFORCE }, |
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{ 0, } |
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}; |
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MODULE_DEVICE_TABLE (pci, amd756_ids); |
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static int amd756_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
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{ |
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int nforce = (id->driver_data == NFORCE); |
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int error; |
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u8 temp; |
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if (amd756_ioport) { |
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dev_err(&pdev->dev, "Only one device supported " |
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"(you have a strange motherboard, btw)\n"); |
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return -ENODEV; |
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} |
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if (nforce) { |
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if (PCI_FUNC(pdev->devfn) != 1) |
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return -ENODEV; |
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pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport); |
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amd756_ioport &= 0xfffc; |
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} else { /* amd */ |
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if (PCI_FUNC(pdev->devfn) != 3) |
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return -ENODEV; |
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pci_read_config_byte(pdev, SMBGCFG, &temp); |
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if ((temp & 128) == 0) { |
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dev_err(&pdev->dev, |
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"Error: SMBus controller I/O not enabled!\n"); |
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return -ENODEV; |
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} |
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/* Determine the address of the SMBus areas */ |
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/* Technically it is a dword but... */ |
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pci_read_config_word(pdev, SMBBA, &amd756_ioport); |
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amd756_ioport &= 0xff00; |
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amd756_ioport += SMB_ADDR_OFFSET; |
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} |
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error = acpi_check_region(amd756_ioport, SMB_IOSIZE, |
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amd756_driver.name); |
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if (error) |
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return -ENODEV; |
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if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) { |
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dev_err(&pdev->dev, "SMB region 0x%x already in use!\n", |
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amd756_ioport); |
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return -ENODEV; |
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} |
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pci_read_config_byte(pdev, SMBREV, &temp); |
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dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp); |
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dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport); |
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/* set up the sysfs linkage to our parent device */ |
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amd756_smbus.dev.parent = &pdev->dev; |
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snprintf(amd756_smbus.name, sizeof(amd756_smbus.name), |
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"SMBus %s adapter at %04x", chipname[id->driver_data], |
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amd756_ioport); |
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error = i2c_add_adapter(&amd756_smbus); |
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if (error) |
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goto out_err; |
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return 0; |
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out_err: |
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release_region(amd756_ioport, SMB_IOSIZE); |
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return error; |
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} |
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static void amd756_remove(struct pci_dev *dev) |
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{ |
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i2c_del_adapter(&amd756_smbus); |
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release_region(amd756_ioport, SMB_IOSIZE); |
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} |
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static struct pci_driver amd756_driver = { |
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.name = "amd756_smbus", |
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.id_table = amd756_ids, |
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.probe = amd756_probe, |
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.remove = amd756_remove, |
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}; |
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module_pci_driver(amd756_driver); |
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MODULE_AUTHOR("Merlin Hughes <[email protected]>"); |
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MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver"); |
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MODULE_LICENSE("GPL"); |
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EXPORT_SYMBOL(amd756_smbus);
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