| /* |
| SMBus driver for nVidia nForce2 MCP |
| |
| Added nForce3 Pro 150 Thomas Leibold <thomas@plx.com>, |
| Ported to 2.5 Patrick Dreker <patrick@dreker.de>, |
| Copyright (c) 2003 Hans-Frieder Vogt <hfvogt@arcor.de>, |
| Based on |
| SMBus 2.0 driver for AMD-8111 IO-Hub |
| Copyright (c) 2002 Vojtech Pavlik |
| |
| 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. |
| */ |
| |
| /* |
| SUPPORTED DEVICES PCI ID |
| nForce2 MCP 0064 |
| nForce2 Ultra 400 MCP 0084 |
| nForce3 Pro150 MCP 00D4 |
| nForce3 250Gb MCP 00E4 |
| nForce4 MCP 0052 |
| nForce4 MCP-04 0034 |
| nForce MCP51 0264 |
| nForce MCP55 0368 |
| nForce MCP61 03EB |
| nForce MCP65 0446 |
| nForce MCP67 0542 |
| nForce MCP73 07D8 |
| nForce MCP78S 0752 |
| nForce MCP79 0AA2 |
| |
| This driver supports the 2 SMBuses that are included in the MCP of the |
| nForce2/3/4/5xx chipsets. |
| */ |
| |
| /* Note: we assume there can only be one nForce2, with two SMBus interfaces */ |
| |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/kernel.h> |
| #include <linux/stddef.h> |
| #include <linux/ioport.h> |
| #include <linux/init.h> |
| #include <linux/i2c.h> |
| #include <linux/delay.h> |
| #include <linux/dmi.h> |
| #include <linux/acpi.h> |
| #include <linux/slab.h> |
| #include <linux/io.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>"); |
| MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver"); |
| |
| |
| struct nforce2_smbus { |
| struct i2c_adapter adapter; |
| int base; |
| int size; |
| int blockops; |
| int can_abort; |
| }; |
| |
| |
| /* |
| * nVidia nForce2 SMBus control register definitions |
| * (Newer incarnations use standard BARs 4 and 5 instead) |
| */ |
| #define NFORCE_PCI_SMB1 0x50 |
| #define NFORCE_PCI_SMB2 0x54 |
| |
| |
| /* |
| * ACPI 2.0 chapter 13 SMBus 2.0 EC register model |
| */ |
| #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */ |
| #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */ |
| #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */ |
| #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */ |
| #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */ |
| #define NVIDIA_SMB_BCNT (smbus->base + 0x24) /* number of data |
| bytes */ |
| #define NVIDIA_SMB_STATUS_ABRT (smbus->base + 0x3c) /* register used to |
| check the status of |
| the abort command */ |
| #define NVIDIA_SMB_CTRL (smbus->base + 0x3e) /* control register */ |
| |
| #define NVIDIA_SMB_STATUS_ABRT_STS 0x01 /* Bit to notify that |
| abort succeeded */ |
| #define NVIDIA_SMB_CTRL_ABORT 0x20 |
| #define NVIDIA_SMB_STS_DONE 0x80 |
| #define NVIDIA_SMB_STS_ALRM 0x40 |
| #define NVIDIA_SMB_STS_RES 0x20 |
| #define NVIDIA_SMB_STS_STATUS 0x1f |
| |
| #define NVIDIA_SMB_PRTCL_WRITE 0x00 |
| #define NVIDIA_SMB_PRTCL_READ 0x01 |
| #define NVIDIA_SMB_PRTCL_QUICK 0x02 |
| #define NVIDIA_SMB_PRTCL_BYTE 0x04 |
| #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06 |
| #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08 |
| #define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a |
| #define NVIDIA_SMB_PRTCL_PEC 0x80 |
| |
| /* Misc definitions */ |
| #define MAX_TIMEOUT 100 |
| |
| /* We disable the second SMBus channel on these boards */ |
| static struct dmi_system_id __devinitdata nforce2_dmi_blacklist2[] = { |
| { |
| .ident = "DFI Lanparty NF4 Expert", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"), |
| DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"), |
| }, |
| }, |
| { } |
| }; |
| |
| static struct pci_driver nforce2_driver; |
| |
| /* For multiplexing support, we need a global reference to the 1st |
| SMBus channel */ |
| #if defined CONFIG_I2C_NFORCE2_S4985 || defined CONFIG_I2C_NFORCE2_S4985_MODULE |
| struct i2c_adapter *nforce2_smbus; |
| EXPORT_SYMBOL_GPL(nforce2_smbus); |
| |
| static void nforce2_set_reference(struct i2c_adapter *adap) |
| { |
| nforce2_smbus = adap; |
| } |
| #else |
| static inline void nforce2_set_reference(struct i2c_adapter *adap) { } |
| #endif |
| |
| static void nforce2_abort(struct i2c_adapter *adap) |
| { |
| struct nforce2_smbus *smbus = adap->algo_data; |
| int timeout = 0; |
| unsigned char temp; |
| |
| dev_dbg(&adap->dev, "Aborting current transaction\n"); |
| |
| outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL); |
| do { |
| msleep(1); |
| temp = inb_p(NVIDIA_SMB_STATUS_ABRT); |
| } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) && |
| (timeout++ < MAX_TIMEOUT)); |
| if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS)) |
| dev_err(&adap->dev, "Can't reset the smbus\n"); |
| outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT); |
| } |
| |
| static int nforce2_check_status(struct i2c_adapter *adap) |
| { |
| struct nforce2_smbus *smbus = adap->algo_data; |
| int timeout = 0; |
| unsigned char temp; |
| |
| do { |
| msleep(1); |
| temp = inb_p(NVIDIA_SMB_STS); |
| } while ((!temp) && (timeout++ < MAX_TIMEOUT)); |
| |
| if (timeout > MAX_TIMEOUT) { |
| dev_dbg(&adap->dev, "SMBus Timeout!\n"); |
| if (smbus->can_abort) |
| nforce2_abort(adap); |
| return -ETIMEDOUT; |
| } |
| if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) { |
| dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| /* Return negative errno on error */ |
| static s32 nforce2_access(struct i2c_adapter * adap, u16 addr, |
| unsigned short flags, char read_write, |
| u8 command, int size, union i2c_smbus_data * data) |
| { |
| struct nforce2_smbus *smbus = adap->algo_data; |
| unsigned char protocol, pec; |
| u8 len; |
| int i, status; |
| |
| protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ : |
| NVIDIA_SMB_PRTCL_WRITE; |
| pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0; |
| |
| switch (size) { |
| |
| case I2C_SMBUS_QUICK: |
| protocol |= NVIDIA_SMB_PRTCL_QUICK; |
| read_write = I2C_SMBUS_WRITE; |
| break; |
| |
| case I2C_SMBUS_BYTE: |
| if (read_write == I2C_SMBUS_WRITE) |
| outb_p(command, NVIDIA_SMB_CMD); |
| protocol |= NVIDIA_SMB_PRTCL_BYTE; |
| break; |
| |
| case I2C_SMBUS_BYTE_DATA: |
| outb_p(command, NVIDIA_SMB_CMD); |
| if (read_write == I2C_SMBUS_WRITE) |
| outb_p(data->byte, NVIDIA_SMB_DATA); |
| protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA; |
| break; |
| |
| case I2C_SMBUS_WORD_DATA: |
| outb_p(command, NVIDIA_SMB_CMD); |
| if (read_write == I2C_SMBUS_WRITE) { |
| outb_p(data->word, NVIDIA_SMB_DATA); |
| outb_p(data->word >> 8, NVIDIA_SMB_DATA+1); |
| } |
| protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec; |
| break; |
| |
| case I2C_SMBUS_BLOCK_DATA: |
| outb_p(command, NVIDIA_SMB_CMD); |
| if (read_write == I2C_SMBUS_WRITE) { |
| len = data->block[0]; |
| if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) { |
| dev_err(&adap->dev, |
| "Transaction failed " |
| "(requested block size: %d)\n", |
| len); |
| return -EINVAL; |
| } |
| outb_p(len, NVIDIA_SMB_BCNT); |
| for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++) |
| outb_p(data->block[i + 1], |
| NVIDIA_SMB_DATA+i); |
| } |
| protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec; |
| break; |
| |
| default: |
| dev_err(&adap->dev, "Unsupported transaction %d\n", size); |
| return -EOPNOTSUPP; |
| } |
| |
| outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR); |
| outb_p(protocol, NVIDIA_SMB_PRTCL); |
| |
| status = nforce2_check_status(adap); |
| if (status) |
| return status; |
| |
| if (read_write == I2C_SMBUS_WRITE) |
| return 0; |
| |
| switch (size) { |
| |
| case I2C_SMBUS_BYTE: |
| case I2C_SMBUS_BYTE_DATA: |
| data->byte = inb_p(NVIDIA_SMB_DATA); |
| break; |
| |
| case I2C_SMBUS_WORD_DATA: |
| data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8); |
| break; |
| |
| case I2C_SMBUS_BLOCK_DATA: |
| len = inb_p(NVIDIA_SMB_BCNT); |
| if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) { |
| dev_err(&adap->dev, "Transaction failed " |
| "(received block size: 0x%02x)\n", |
| len); |
| return -EPROTO; |
| } |
| for (i = 0; i < len; i++) |
| data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i); |
| data->block[0] = len; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| |
| static u32 nforce2_func(struct i2c_adapter *adapter) |
| { |
| /* other functionality might be possible, but is not tested */ |
| return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
| I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
| I2C_FUNC_SMBUS_PEC | |
| (((struct nforce2_smbus*)adapter->algo_data)->blockops ? |
| I2C_FUNC_SMBUS_BLOCK_DATA : 0); |
| } |
| |
| static struct i2c_algorithm smbus_algorithm = { |
| .smbus_xfer = nforce2_access, |
| .functionality = nforce2_func, |
| }; |
| |
| |
| static const struct pci_device_id nforce2_ids[] = { |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP67_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP78S_SMBUS) }, |
| { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS) }, |
| { 0 } |
| }; |
| |
| MODULE_DEVICE_TABLE (pci, nforce2_ids); |
| |
| |
| static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar, |
| int alt_reg, struct nforce2_smbus *smbus, const char *name) |
| { |
| int error; |
| |
| smbus->base = pci_resource_start(dev, bar); |
| if (smbus->base) { |
| smbus->size = pci_resource_len(dev, bar); |
| } else { |
| /* Older incarnations of the device used non-standard BARs */ |
| u16 iobase; |
| |
| if (pci_read_config_word(dev, alt_reg, &iobase) |
| != PCIBIOS_SUCCESSFUL) { |
| dev_err(&dev->dev, "Error reading PCI config for %s\n", |
| name); |
| return -EIO; |
| } |
| |
| smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK; |
| smbus->size = 64; |
| } |
| |
| error = acpi_check_region(smbus->base, smbus->size, |
| nforce2_driver.name); |
| if (error) |
| return -1; |
| |
| if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) { |
| dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n", |
| smbus->base, smbus->base+smbus->size-1, name); |
| return -EBUSY; |
| } |
| smbus->adapter.owner = THIS_MODULE; |
| smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; |
| smbus->adapter.algo = &smbus_algorithm; |
| smbus->adapter.algo_data = smbus; |
| smbus->adapter.dev.parent = &dev->dev; |
| snprintf(smbus->adapter.name, sizeof(smbus->adapter.name), |
| "SMBus nForce2 adapter at %04x", smbus->base); |
| |
| error = i2c_add_adapter(&smbus->adapter); |
| if (error) { |
| dev_err(&smbus->adapter.dev, "Failed to register adapter.\n"); |
| release_region(smbus->base, smbus->size); |
| return error; |
| } |
| dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base); |
| return 0; |
| } |
| |
| |
| static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id) |
| { |
| struct nforce2_smbus *smbuses; |
| int res1, res2; |
| |
| /* we support 2 SMBus adapters */ |
| if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL))) |
| return -ENOMEM; |
| pci_set_drvdata(dev, smbuses); |
| |
| switch(dev->device) { |
| case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS: |
| case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS: |
| case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS: |
| smbuses[0].blockops = 1; |
| smbuses[1].blockops = 1; |
| smbuses[0].can_abort = 1; |
| smbuses[1].can_abort = 1; |
| } |
| |
| /* SMBus adapter 1 */ |
| res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1"); |
| if (res1 < 0) { |
| dev_err(&dev->dev, "Error probing SMB1.\n"); |
| smbuses[0].base = 0; /* to have a check value */ |
| } |
| /* SMBus adapter 2 */ |
| if (dmi_check_system(nforce2_dmi_blacklist2)) { |
| dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n"); |
| res2 = -EPERM; |
| smbuses[1].base = 0; |
| } else { |
| res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], |
| "SMB2"); |
| if (res2 < 0) { |
| dev_err(&dev->dev, "Error probing SMB2.\n"); |
| smbuses[1].base = 0; /* to have a check value */ |
| } |
| } |
| if ((res1 < 0) && (res2 < 0)) { |
| /* we did not find even one of the SMBuses, so we give up */ |
| kfree(smbuses); |
| return -ENODEV; |
| } |
| |
| nforce2_set_reference(&smbuses[0].adapter); |
| return 0; |
| } |
| |
| |
| static void __devexit nforce2_remove(struct pci_dev *dev) |
| { |
| struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev); |
| |
| nforce2_set_reference(NULL); |
| if (smbuses[0].base) { |
| i2c_del_adapter(&smbuses[0].adapter); |
| release_region(smbuses[0].base, smbuses[0].size); |
| } |
| if (smbuses[1].base) { |
| i2c_del_adapter(&smbuses[1].adapter); |
| release_region(smbuses[1].base, smbuses[1].size); |
| } |
| kfree(smbuses); |
| } |
| |
| static struct pci_driver nforce2_driver = { |
| .name = "nForce2_smbus", |
| .id_table = nforce2_ids, |
| .probe = nforce2_probe, |
| .remove = __devexit_p(nforce2_remove), |
| }; |
| |
| static int __init nforce2_init(void) |
| { |
| return pci_register_driver(&nforce2_driver); |
| } |
| |
| static void __exit nforce2_exit(void) |
| { |
| pci_unregister_driver(&nforce2_driver); |
| } |
| |
| module_init(nforce2_init); |
| module_exit(nforce2_exit); |
| |