diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-piix4.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-piix4.c | 196 |
1 files changed, 164 insertions, 32 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 630bce68b..93f289538 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -23,6 +23,9 @@ Note: we assume there can only be one device, with one or more SMBus interfaces. + The device can register multiple i2c_adapters (up to PIIX4_MAX_ADAPTERS). + For devices supporting multiple ports the i2c_adapter should provide + an i2c_algorithm to access them. */ #include <linux/module.h> @@ -37,6 +40,7 @@ #include <linux/dmi.h> #include <linux/acpi.h> #include <linux/io.h> +#include <linux/mutex.h> /* PIIX4 SMBus address offsets */ @@ -75,6 +79,16 @@ #define PIIX4_WORD_DATA 0x0C #define PIIX4_BLOCK_DATA 0x14 +/* Multi-port constants */ +#define PIIX4_MAX_ADAPTERS 4 + +/* SB800 constants */ +#define SB800_PIIX4_SMB_IDX 0xcd6 + +/* SB800 port is selected by bits 2:1 of the smb_en register (0x2c) */ +#define SB800_PIIX4_PORT_IDX 0x2c +#define SB800_PIIX4_PORT_IDX_MASK 0x06 + /* insmod parameters */ /* If force is set to anything different from 0, we forcibly enable the @@ -122,8 +136,19 @@ static const struct dmi_system_id piix4_dmi_ibm[] = { { }, }; +/* SB800 globals */ +static DEFINE_MUTEX(piix4_mutex_sb800); +static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = { + " port 0", " port 2", " port 3", " port 4" +}; +static const char *piix4_aux_port_name_sb800 = " port 1"; + struct i2c_piix4_adapdata { unsigned short smba; + + /* SB800 */ + bool sb800_main; + unsigned short port; }; static int piix4_setup(struct pci_dev *PIIX4_dev, @@ -229,7 +254,6 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev, const struct pci_device_id *id, u8 aux) { unsigned short piix4_smba; - unsigned short smba_idx = 0xcd6; u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status; u8 i2ccfg, i2ccfg_offset = 0x10; @@ -251,16 +275,12 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev, else smb_en = (aux) ? 0x28 : 0x2c; - if (!request_region(smba_idx, 2, "smba_idx")) { - dev_err(&PIIX4_dev->dev, "SMBus base address index region " - "0x%x already in use!\n", smba_idx); - return -EBUSY; - } - outb_p(smb_en, smba_idx); - smba_en_lo = inb_p(smba_idx + 1); - outb_p(smb_en + 1, smba_idx); - smba_en_hi = inb_p(smba_idx + 1); - release_region(smba_idx, 2); + mutex_lock(&piix4_mutex_sb800); + outb_p(smb_en, SB800_PIIX4_SMB_IDX); + smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1); + outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX); + smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1); + mutex_unlock(&piix4_mutex_sb800); if (!smb_en) { smb_en_status = smba_en_lo & 0x10; @@ -483,7 +503,7 @@ static s32 piix4_access(struct i2c_adapter * adap, u16 addr, if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) return -EINVAL; outb_p(len, SMBHSTDAT0); - i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ + inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ for (i = 1; i <= len; i++) outb_p(data->block[i], SMBBLKDAT); } @@ -516,7 +536,7 @@ static s32 piix4_access(struct i2c_adapter * adap, u16 addr, data->block[0] = inb_p(SMBHSTDAT0); if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX) return -EPROTO; - i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ + inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ for (i = 1; i <= data->block[0]; i++) data->block[i] = inb_p(SMBBLKDAT); break; @@ -524,6 +544,43 @@ static s32 piix4_access(struct i2c_adapter * adap, u16 addr, return 0; } +/* + * Handles access to multiple SMBus ports on the SB800. + * The port is selected by bits 2:1 of the smb_en register (0x2c). + * Returns negative errno on error. + * + * Note: The selected port must be returned to the initial selection to avoid + * problems on certain systems. + */ +static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr, + unsigned short flags, char read_write, + u8 command, int size, union i2c_smbus_data *data) +{ + struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap); + u8 smba_en_lo; + u8 port; + int retval; + + mutex_lock(&piix4_mutex_sb800); + + outb_p(SB800_PIIX4_PORT_IDX, SB800_PIIX4_SMB_IDX); + smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1); + + port = adapdata->port; + if ((smba_en_lo & SB800_PIIX4_PORT_IDX_MASK) != (port << 1)) + outb_p((smba_en_lo & ~SB800_PIIX4_PORT_IDX_MASK) | (port << 1), + SB800_PIIX4_SMB_IDX + 1); + + retval = piix4_access(adap, addr, flags, read_write, + command, size, data); + + outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1); + + mutex_unlock(&piix4_mutex_sb800); + + return retval; +} + static u32 piix4_func(struct i2c_adapter *adapter) { return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | @@ -536,6 +593,11 @@ static const struct i2c_algorithm smbus_algorithm = { .functionality = piix4_func, }; +static const struct i2c_algorithm piix4_smbus_algorithm_sb800 = { + .smbus_xfer = piix4_access_sb800, + .functionality = piix4_func, +}; + static const struct pci_device_id piix4_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) }, @@ -561,11 +623,12 @@ static const struct pci_device_id piix4_ids[] = { MODULE_DEVICE_TABLE (pci, piix4_ids); -static struct i2c_adapter *piix4_main_adapter; +static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS]; static struct i2c_adapter *piix4_aux_adapter; static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, - struct i2c_adapter **padap) + bool sb800_main, unsigned short port, + const char *name, struct i2c_adapter **padap) { struct i2c_adapter *adap; struct i2c_piix4_adapdata *adapdata; @@ -579,7 +642,8 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, adap->owner = THIS_MODULE; adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; - adap->algo = &smbus_algorithm; + adap->algo = sb800_main ? &piix4_smbus_algorithm_sb800 + : &smbus_algorithm; adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL); if (adapdata == NULL) { @@ -589,12 +653,14 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, } adapdata->smba = smba; + adapdata->sb800_main = sb800_main; + adapdata->port = port; /* set up the sysfs linkage to our parent device */ adap->dev.parent = &dev->dev; snprintf(adap->name, sizeof(adap->name), - "SMBus PIIX4 adapter at %04x", smba); + "SMBus PIIX4 adapter%s at %04x", name, smba); i2c_set_adapdata(adap, adapdata); @@ -611,27 +677,83 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, return 0; } +static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba) +{ + struct i2c_piix4_adapdata *adapdata; + int port; + int retval; + + for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) { + retval = piix4_add_adapter(dev, smba, true, port, + piix4_main_port_names_sb800[port], + &piix4_main_adapters[port]); + if (retval < 0) + goto error; + } + + return retval; + +error: + dev_err(&dev->dev, + "Error setting up SB800 adapters. Unregistering!\n"); + while (--port >= 0) { + adapdata = i2c_get_adapdata(piix4_main_adapters[port]); + if (adapdata->smba) { + i2c_del_adapter(piix4_main_adapters[port]); + kfree(adapdata); + kfree(piix4_main_adapters[port]); + piix4_main_adapters[port] = NULL; + } + } + + return retval; +} + static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id) { int retval; + bool is_sb800 = false; if ((dev->vendor == PCI_VENDOR_ID_ATI && dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS && dev->revision >= 0x40) || - dev->vendor == PCI_VENDOR_ID_AMD) + dev->vendor == PCI_VENDOR_ID_AMD) { + is_sb800 = true; + + if (!request_region(SB800_PIIX4_SMB_IDX, 2, "smba_idx")) { + dev_err(&dev->dev, + "SMBus base address index region 0x%x already in use!\n", + SB800_PIIX4_SMB_IDX); + return -EBUSY; + } + /* base address location etc changed in SB800 */ retval = piix4_setup_sb800(dev, id, 0); - else - retval = piix4_setup(dev, id); + if (retval < 0) { + release_region(SB800_PIIX4_SMB_IDX, 2); + return retval; + } - /* If no main SMBus found, give up */ - if (retval < 0) - return retval; + /* + * Try to register multiplexed main SMBus adapter, + * give up if we can't + */ + retval = piix4_add_adapters_sb800(dev, retval); + if (retval < 0) { + release_region(SB800_PIIX4_SMB_IDX, 2); + return retval; + } + } else { + retval = piix4_setup(dev, id); + if (retval < 0) + return retval; - /* Try to register main SMBus adapter, give up if we can't */ - retval = piix4_add_adapter(dev, retval, &piix4_main_adapter); - if (retval < 0) - return retval; + /* Try to register main SMBus adapter, give up if we can't */ + retval = piix4_add_adapter(dev, retval, false, 0, "", + &piix4_main_adapters[0]); + if (retval < 0) + return retval; + } /* Check for auxiliary SMBus on some AMD chipsets */ retval = -ENODEV; @@ -654,7 +776,9 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id) if (retval > 0) { /* Try to add the aux adapter if it exists, * piix4_add_adapter will clean up if this fails */ - piix4_add_adapter(dev, retval, &piix4_aux_adapter); + piix4_add_adapter(dev, retval, false, 0, + is_sb800 ? piix4_aux_port_name_sb800 : "", + &piix4_aux_adapter); } return 0; @@ -666,7 +790,11 @@ static void piix4_adap_remove(struct i2c_adapter *adap) if (adapdata->smba) { i2c_del_adapter(adap); - release_region(adapdata->smba, SMBIOSIZE); + if (adapdata->port == 0) { + release_region(adapdata->smba, SMBIOSIZE); + if (adapdata->sb800_main) + release_region(SB800_PIIX4_SMB_IDX, 2); + } kfree(adapdata); kfree(adap); } @@ -674,9 +802,13 @@ static void piix4_adap_remove(struct i2c_adapter *adap) static void piix4_remove(struct pci_dev *dev) { - if (piix4_main_adapter) { - piix4_adap_remove(piix4_main_adapter); - piix4_main_adapter = NULL; + int port = PIIX4_MAX_ADAPTERS; + + while (--port >= 0) { + if (piix4_main_adapters[port]) { + piix4_adap_remove(piix4_main_adapters[port]); + piix4_main_adapters[port] = NULL; + } } if (piix4_aux_adapter) { |