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/* Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org> Shamelessly ripped from i2c-piix4.c: Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* 2002-04-08: Added nForce support. (Csaba Halasz) 2002-10-03: Fixed nForce PnP I/O port. (Michael Steil) 2002-12-28: Rewritten into something that resembles a Linux driver (hch) 2003-11-29: Added back AMD8111 removed by the previous rewrite. (Philip Pokorny) */ /* Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce Note: we assume there can only be one device, with one SMBus interface. */ #include <linux/module.h> #include <linux/pci.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/stddef.h> #include <linux/ioport.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/acpi.h> #include <linux/io.h> /* AMD756 SMBus address offsets */ #define SMB_ADDR_OFFSET 0xE0 #define SMB_IOSIZE 16 #define SMB_GLOBAL_STATUS (0x0 + amd756_ioport) #define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport) #define SMB_HOST_ADDRESS (0x4 + amd756_ioport) #define SMB_HOST_DATA (0x6 + amd756_ioport) #define SMB_HOST_COMMAND (0x8 + amd756_ioport) #define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport) #define SMB_HAS_DATA (0xA + amd756_ioport) #define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport) #define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport) #define SMB_SNOOP_ADDRESS (0xF + amd756_ioport) /* PCI Address Constants */ /* address of I/O space */ #define SMBBA 0x058 /* mh */ #define SMBBANFORCE 0x014 /* general configuration */ #define SMBGCFG 0x041 /* mh */ /* silicon revision code */ #define SMBREV 0x008 /* Other settings */ #define MAX_TIMEOUT 500 /* AMD756 constants */ #define AMD756_QUICK 0x00 #define AMD756_BYTE 0x01 #define AMD756_BYTE_DATA 0x02 #define AMD756_WORD_DATA 0x03 #define AMD756_PROCESS_CALL 0x04 #define AMD756_BLOCK_DATA 0x05 static struct pci_driver amd756_driver; static unsigned short amd756_ioport; /* SMBUS event = I/O 28-29 bit 11 see E0 for the status bits and enabled in E2 */ #define GS_ABRT_STS (1 << 0) #define GS_COL_STS (1 << 1) #define GS_PRERR_STS (1 << 2) #define GS_HST_STS (1 << 3) #define GS_HCYC_STS (1 << 4) #define GS_TO_STS (1 << 5) #define GS_SMB_STS (1 << 11) #define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \ GS_HCYC_STS | GS_TO_STS ) #define GE_CYC_TYPE_MASK (7) #define GE_HOST_STC (1 << 3) #define GE_ABORT (1 << 5) static int amd756_transaction(struct i2c_adapter *adap) { int temp; int result = 0; int timeout = 0; dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, " "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA)); /* Make sure the SMBus host is ready to start transmitting */ if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) { dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp); do { msleep(1); temp = inw_p(SMB_GLOBAL_STATUS); } while ((temp & (GS_HST_STS | GS_SMB_STS)) && (timeout++ < MAX_TIMEOUT)); /* If the SMBus is still busy, we give up */ if (timeout > MAX_TIMEOUT) { dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp); goto abort; } timeout = 0; } /* start the transaction by setting the start bit */ outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE); /* We will always wait for a fraction of a second! */ do { msleep(1); temp = inw_p(SMB_GLOBAL_STATUS); } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT)); /* If the SMBus is still busy, we give up */ if (timeout > MAX_TIMEOUT) { dev_dbg(&adap->dev, "Completion timeout!\n"); goto abort; } if (temp & GS_PRERR_STS) { result = -ENXIO; dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n"); } if (temp & GS_COL_STS) { result = -EIO; dev_warn(&adap->dev, "SMBus collision!\n"); } if (temp & GS_TO_STS) { result = -ETIMEDOUT; dev_dbg(&adap->dev, "SMBus protocol timeout!\n"); } if (temp & GS_HCYC_STS) dev_dbg(&adap->dev, "SMBus protocol success!\n"); outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); #ifdef DEBUG if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) { dev_dbg(&adap->dev, "Failed reset at end of transaction (%04x)\n", temp); } #endif dev_dbg(&adap->dev, "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA)); return result; abort: dev_warn(&adap->dev, "Sending abort\n"); outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE); msleep(100); outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); return -EIO; } /* Return negative errno on error. */ static s32 amd756_access(struct i2c_adapter * adap, u16 addr, unsigned short flags, char read_write, u8 command, int size, union i2c_smbus_data * data) { int i, len; int status; switch (size) { case I2C_SMBUS_QUICK: outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMB_HOST_ADDRESS); size = AMD756_QUICK; break; case I2C_SMBUS_BYTE: outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMB_HOST_ADDRESS); if (read_write == I2C_SMBUS_WRITE) outb_p(command, SMB_HOST_DATA); size = AMD756_BYTE; break; case I2C_SMBUS_BYTE_DATA: outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMB_HOST_ADDRESS); outb_p(command, SMB_HOST_COMMAND); if (read_write == I2C_SMBUS_WRITE) outw_p(data->byte, SMB_HOST_DATA); size = AMD756_BYTE_DATA; break; case I2C_SMBUS_WORD_DATA: outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMB_HOST_ADDRESS); outb_p(command, SMB_HOST_COMMAND); if (read_write == I2C_SMBUS_WRITE) outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */ size = AMD756_WORD_DATA; break; case I2C_SMBUS_BLOCK_DATA: outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMB_HOST_ADDRESS); outb_p(command, SMB_HOST_COMMAND); if (read_write == I2C_SMBUS_WRITE) { len = data->block[0]; if (len < 0) len = 0; if (len > 32) len = 32; outw_p(len, SMB_HOST_DATA); /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ for (i = 1; i <= len; i++) outb_p(data->block[i], SMB_HOST_BLOCK_DATA); } size = AMD756_BLOCK_DATA; break; default: dev_warn(&adap->dev, "Unsupported transaction %d\n", size); return -EOPNOTSUPP; } /* How about enabling interrupts... */ outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE); status = amd756_transaction(adap); if (status) return status; if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK)) return 0; switch (size) { case AMD756_BYTE: data->byte = inw_p(SMB_HOST_DATA); break; case AMD756_BYTE_DATA: data->byte = inw_p(SMB_HOST_DATA); break; case AMD756_WORD_DATA: data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */ break; case AMD756_BLOCK_DATA: data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f; if(data->block[0] > 32) data->block[0] = 32; /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ for (i = 1; i <= data->block[0]; i++) data->block[i] = inb_p(SMB_HOST_BLOCK_DATA); break; } return 0; } static u32 amd756_func(struct i2c_adapter *adapter) { return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA; } static const struct i2c_algorithm smbus_algorithm = { .smbus_xfer = amd756_access, .functionality = amd756_func, }; struct i2c_adapter amd756_smbus = { .owner = THIS_MODULE, .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, .algo = &smbus_algorithm, }; enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 }; static const char* chipname[] = { "AMD756", "AMD766", "AMD768", "nVidia nForce", "AMD8111", }; static DEFINE_PCI_DEVICE_TABLE(amd756_ids) = { { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B), .driver_data = AMD756 }, { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413), .driver_data = AMD766 }, { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443), .driver_data = AMD768 }, { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS), .driver_data = AMD8111 }, { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS), .driver_data = NFORCE }, { 0, } }; MODULE_DEVICE_TABLE (pci, amd756_ids); static int __devinit amd756_probe(struct pci_dev *pdev, const struct pci_device_id *id) { int nforce = (id->driver_data == NFORCE); int error; u8 temp; if (amd756_ioport) { dev_err(&pdev->dev, "Only one device supported " "(you have a strange motherboard, btw)\n"); return -ENODEV; } if (nforce) { if (PCI_FUNC(pdev->devfn) != 1) return -ENODEV; pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport); amd756_ioport &= 0xfffc; } else { /* amd */ if (PCI_FUNC(pdev->devfn) != 3) return -ENODEV; pci_read_config_byte(pdev, SMBGCFG, &temp); if ((temp & 128) == 0) { dev_err(&pdev->dev, "Error: SMBus controller I/O not enabled!\n"); return -ENODEV; } /* Determine the address of the SMBus areas */ /* Technically it is a dword but... */ pci_read_config_word(pdev, SMBBA, &amd756_ioport); amd756_ioport &= 0xff00; amd756_ioport += SMB_ADDR_OFFSET; } error = acpi_check_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name); if (error) return -ENODEV; if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) { dev_err(&pdev->dev, "SMB region 0x%x already in use!\n", amd756_ioport); return -ENODEV; } pci_read_config_byte(pdev, SMBREV, &temp); dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp); dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport); /* set up the sysfs linkage to our parent device */ amd756_smbus.dev.parent = &pdev->dev; snprintf(amd756_smbus.name, sizeof(amd756_smbus.name), "SMBus %s adapter at %04x", chipname[id->driver_data], amd756_ioport); error = i2c_add_adapter(&amd756_smbus); if (error) { dev_err(&pdev->dev, "Adapter registration failed, module not inserted\n"); goto out_err; } return 0; out_err: release_region(amd756_ioport, SMB_IOSIZE); return error; } static void __devexit amd756_remove(struct pci_dev *dev) { i2c_del_adapter(&amd756_smbus); release_region(amd756_ioport, SMB_IOSIZE); } static struct pci_driver amd756_driver = { .name = "amd756_smbus", .id_table = amd756_ids, .probe = amd756_probe, .remove = __devexit_p(amd756_remove), }; module_pci_driver(amd756_driver); MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>"); MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver"); MODULE_LICENSE("GPL"); EXPORT_SYMBOL(amd756_smbus);


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