Dear Rudolf Thank you for your suggestion on implementing the multiplexing driver, I will start to implement it and ask your help after some time, when I??m a little free, because I??m so busy with my new project, you know. :-( Thanks Best Regards Chunhao > -----Original Message----- > From: Rudolf Marek [mailto:r.marek at sh.cvut.cz] > Sent: 2005??4??23?? 5:43 > To: lm_sensors > Cc: PI14 HUANG0; PI10 LHHsu; PI14 DZSHEN > Subject: Re: NCLV-D SMBus - proposal to a solution > > Hello, > > Seems you reply got filtered from spamfilter but thanks to Phil, he catches > it > from time to time. It seems that footers with chinese > get marked as probable spam in most cases. > > >This is the answer from ASUS: > >So far most server boards with W83792(A)D follow the same SMBus > >topology. You do not need to pay attention to this issue. > > Ok I have here a quick and dirty shot that implements the multiplexing driver. > It is a more scatch than the real thing but it reflect how it will be done. > > I followed the driver made by Jean. This is more is different it has a "mux" > in ISA IO space. The asus MB is detected in two phases. (ISA bridge and > then subsystem ID of SMBUS) > > Please comment the idea. I'm still busy theese days so I cant work on this in > next two weeks I think. But maybe Chunhao or someone from Winbond want to do > that earlier. > > Thanks > > regards > > Rudolf > > extern struct i2c_adapter i801_smbus; > > static struct i2c_adapter *asus_adapter; > static struct i2c_algorithm *asus_algo; > > static int muxbase; > > /* Wrapper access functions for multiplexed SMBus */ > static struct semaphore i801_lock; > > void mux_switch(int what) { > > //here should be the mux switching code similar to one bellow > //we should switch the bus according specs > > > // + > val=inb((region&~GPIO_IOSIZE_MASK)+GPIO_OUTPUT2_REG_HIGH); > > // + val&=~0x4; /* GPIO42 : 0 (Low) */ > > // + val|=0x8; /* GPIO43 : 1 (High) */ > > // + outb(val, > (region&~GPIO_IOSIZE_MASK)+GPIO_OUTPUT2_REG_HIGH); > > // + printk(KERN_INFO "PCI: Canceling ASUS hide and seek > played > with SMBus monitoring chi > > > > outb(muxbase+addr, whatbits) > > } > > /* We remember the last used channels combination so as to only switch > channels when it is really needed. This greatly reduces the SMBus > overhead, but also assumes that nobody will be writing to the PCA9556 > in our back. */ > static u8 last_channels; > > static inline s32 i801_access_channel(struct i2c_adapter * adap, u16 addr, > unsigned short flags, char read_write, > u8 command, int size, > union i2c_smbus_data * data, > u8 channels) > { > int error; > > // /* We exclude the non-multiplexed addresses */ > // if (addr != 0x4c && (addr & 0xfc) != 0x50 && (addr & 0xfc) != 0x30) > // return -1; > // > down(&i801_lock); > > if (last_channels != channels) { //this is wise ;) > mux_switch(channels); > last_channels = channels; > } > error = i801_smbus.algo->smbus_xfer(adap, addr, flags, read_write, > command, size, data); > > UNLOCK: > up(&i801_lock); > return error; > } > > static s32 i801_access_virt1(struct i2c_adapter * adap, u16 addr, > unsigned short flags, char read_write, > u8 command, int size, > union i2c_smbus_data * data) > { > /* CPU0: channels 1 and 0 enabled */ > return i801_access_channel(adap, addr, flags, read_write, command, > size, data, 0x1); > } > > > static s32 i801_access_virt0(struct i2c_adapter * adap, u16 addr, > unsigned short flags, char read_write, > u8 command, int size, > union i2c_smbus_data * data) > { > > return i801_access_channel(adap, addr, flags, read_write, command, > size, data, 0x00); > } > > > //static int __init i801_asus_init(void) > //{ > > static int __devinit asus_sb_probe(struct pci_dev *dev, const struct > pci_device_id *id) > { > int i, error; > int asus_server_board_hides_smbus_devices=0; > union i2c_smbus_data ioconfig; > > struct pci_dev *smbdev = NULL; > > //we are here because INTEL ISA Brigde is present > > while (smbdev = pci_get_device(PCI_VENDOR_ID_INTEL, > PCI_DEVICE_ID_INTEL_ESB_4, smbdev)) { > > if (unlikely(smbdev->subsystem_vendor == PCI_VENDOR_ID_ASUSTEK)) { > > switch(smbdev->subsystem_device) { > > case 0x8117: > asus_server_board_hides_smbus_devices = 1; > > break; > > } > > } > > } > > //we know this is our board > if (asus_server_board_hides_smbus_devices!=1) return -ENODEV; > //get GPIO base > pci_read_config_dword(dev, 0x58, &muxbase); > > if (muxbase==0) { // error > } > //register > if (!request_region(muxbase, 0xDONTKNOW, "GPIO MUX")) { > //error > } > > > /* Unregister physical bus */ > error = i2c_del_adapter(&i801_smbus); > if (error) { > if (error == -EINVAL) > error = -ENODEV; > else > dev_err(&i801_smbus.dev, "Physical bus removal " > "failed\n"); > goto ERROR0; > } > > printk(KERN_INFO "Enabling SMBus multiplexing for ASUS\n"); > init_MUTEX(&i801_lock); > > /* Define the 2 virtual adapters and algorithms structures */ > if (!(asus_adapter = kmalloc(2 * sizeof(struct i2c_adapter), > GFP_KERNEL))) { > error = -ENOMEM; > goto ERROR1; > } > if (!(asus_algo = kmalloc(2 * sizeof(struct i2c_algorithm), > GFP_KERNEL))) { > error = -ENOMEM; > goto ERROR2; > } > > /* Fill in the new structures */ > asus_algo[0] = *(i801_smbus.algo); > asus_algo[1] = *(i801_smbus.algo); > > asus_algo[0].smbus_xfer = i801_access_virt0; > asus_algo[1].smbus_xfer = i801_access_virt1; > > asus_adapter[0] = i801_smbus; > asus_adapter[1] = i801_smbus; > asus_adapter[0].algo = asus_algo; > asus_adapter[1].algo = asus_algo+1; > > > error = i2c_add_adapter(asus_adapter+0); > > error = i2c_add_adapter(asus_adapter+1); > > if (error) { > dev_err(&i801_smbus.dev, > "Virtual adapter %d registration " > "failed, module not inserted\n", i); > for (i--; i >= 0; i--) > i2c_del_adapter(asus_adapter+i); > goto ERROR3; > } > > //REDO ERR HANDLING > //return -ENODEV because we want only part of the device same as i2c-viapro.c > return 0; > > ERROR3: > kfree(asus_algo); > asus_algo = NULL; > ERROR2: > kfree(asus_adapter); > asus_adapter = NULL; > ERROR1: > i2c_del_adapter(&i801_smbus); > ERROR0: > return error; > } > > static void __devexit asus_sb_remove(struct pci_dev *dev) > { > > //this needs redo too > if (asus_adapter) { > int i; > > for (i = 0; i < 5; i++) > i2c_del_adapter(asus_adapter+i); > kfree(asus_adapter); > asus_adapter = NULL; > } > if (asus_algo) { > kfree(asus_algo); > asus_algo = NULL; > } > > /* Restore physical bus */ > if (i2c_add_adapter(&i801_smbus)) > dev_err(&i801_smbus.dev, "Physical bus restoration " > "failed\n"); > } > > > static struct pci_device_id asus_sb_ids[] = { > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1) }, > { 0, } > }; > > MODULE_DEVICE_TABLE (pci, asus_sb_ids); > > > > > static struct pci_driver asus_sb_driver = { > .name = "asus_sb_smbus", > .id_table = asus_sb_ids, > .probe = asus_sb_probe, > .remove = __devexit_p(asus_sb_remove), > }; > > static int __init i2c_asus_sb_init(void) > { > return pci_register_driver(&asus_sb_driver); > } > > static void __exit i2c_asus_sb_exit(void) > { > pci_unregister_driver(&asus_sb_driver); > } > > MODULE_LICENSE("GPL"); > > module_init(i2c_asus_sb_init); > module_exit(i2c_asus_sb_exit); ===========================================================================================The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original author of this email. 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