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Unfortunately the AMD naming and PCI Device IDs aren't particularly helpful here. The SMBus port selection register is common to the following Families and models, as documented in AMD's publicly available BIOS and Kernel Developer Guides: 50742 - Family 15h Model 60h-6Fh (PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) 55072 - Family 15h Model 70h-7Fh (PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) 52740 - Family 16h Model 30h-3Fh (PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) The Hudson2 PCI Device ID (PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) is shared between Bolton FCH and Family 16h Model 30h, but the location of the SmBus0Sel port selection bits are different: 51192 - Bolton Register Reference Guide We distinguish between Bolton and Family 16h Model 30h using the PCI Revision ID: Bolton is device 0x780b, revision 0x15 Family 16h Model 30h is device 0x780b, revision 0x1F Family 15h Model 60h and 70h are both device 0x790b, revision 0x4A. The following additional public AMD BKDG documents were checked and do not share the same port selection register: 42301 - Family 15h Model 00h-0Fh doesn't mention any 42300 - Family 15h Model 10h-1Fh doesn't mention any 49125 - Family 15h Model 30h-3Fh doesn't mention any 48751 - Family 16h Model 00h-0Fh uses the previously supported index register SB800_PIIX4_PORT_IDX_ALT at 0x2e Signed-off-by: Andrew Cooks --- drivers/i2c/busses/i2c-piix4.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 462948e..89692f4 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -99,7 +99,7 @@ #define SB800_PIIX4_PORT_IDX_MASK 0x06 #define SB800_PIIX4_PORT_IDX_SHIFT 1 -/* On kerncz, SmBus0Sel is at bit 20:19 of PMx00 DecodeEn */ +/* On kerncz and Hudson2, SmBus0Sel is at bit 20:19 of PMx00 DecodeEn */ #define SB800_PIIX4_PORT_IDX_KERNCZ 0x02 #define SB800_PIIX4_PORT_IDX_MASK_KERNCZ 0x18 #define SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ 3 @@ -359,18 +359,16 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev, /* Find which register is used for port selection */ if (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD) { - switch (PIIX4_dev->device) { - case PCI_DEVICE_ID_AMD_KERNCZ_SMBUS: + if ((PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) || + (PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS && + PIIX4_dev->revision >= 0x1F)) { piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_KERNCZ; piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK_KERNCZ; piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ; - break; - case PCI_DEVICE_ID_AMD_HUDSON2_SMBUS: - default: + } else { piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_ALT; piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK; piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT; - break; } } else { mutex_lock(&piix4_mutex_sb800); From patchwork Mon Jan 29 03:54:19 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Cooks X-Patchwork-Id: 867015 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=opengear.com header.i=@opengear.com header.b="jDqfAxzT"; 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According to the AMD BIOS and Kernel Developer's Guides (BKDG), Port 3 and Port 4 are reserved on the following devices: - Family 15h Model 60h-6Fh, - Family 15h Model 70h-7Fh, - Family 16h Models 30h-3Fh, Signed-off-by: Andrew Cooks --- drivers/i2c/busses/i2c-piix4.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 89692f4..9763241 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -82,6 +82,13 @@ /* Multi-port constants */ #define PIIX4_MAX_ADAPTERS 4 +/* + * Main adapter port count. At least one (Port 0) plus up to 3 additional + * (Ports 2-4) + */ +#define SB800_MAIN_PORTS 4 +#define HUDSON2_MAIN_PORTS 2 /* HUDSON2, reserves Port 3 and Port 4 */ + /* SB800 constants */ #define SB800_PIIX4_SMB_IDX 0xcd6 @@ -800,6 +807,7 @@ MODULE_DEVICE_TABLE (pci, piix4_ids); static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS]; static struct i2c_adapter *piix4_aux_adapter; +static int piix4_adapter_count; static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, bool sb800_main, u8 port, bool notify_imc, @@ -856,10 +864,17 @@ static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba, bool notify_imc) { struct i2c_piix4_adapdata *adapdata; - int port; + int port, port_count; int retval; - for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) { + if (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS || + dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) { + port_count = HUDSON2_MAIN_PORTS; + } else { + port_count = SB800_MAIN_PORTS; + } + + for (port = 0; port < port_count; port++) { retval = piix4_add_adapter(dev, smba, true, port, notify_imc, piix4_main_port_names_sb800[port], &piix4_main_adapters[port]); @@ -872,7 +887,7 @@ static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba, error: dev_err(&dev->dev, "Error setting up SB800 adapters. Unregistering!\n"); - while (--port >= 0) { + while (--piix4_adapter_count >= 0) { adapdata = i2c_get_adapdata(piix4_main_adapters[port]); if (adapdata->smba) { i2c_del_adapter(piix4_main_adapters[port]); @@ -993,12 +1008,10 @@ static void piix4_adap_remove(struct i2c_adapter *adap) static void piix4_remove(struct pci_dev *dev) { - 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; + while (--piix4_adapter_count >= 0) { + if (piix4_main_adapters[piix4_adapter_count]) { + piix4_adap_remove(piix4_main_adapters[piix4_adapter_count]); + piix4_main_adapters[piix4_adapter_count] = NULL; } } From patchwork Mon Jan 29 03:54:20 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Cooks X-Patchwork-Id: 867014 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; 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It builds on the related I2C mux device work in commit 8eb5c87a92c0 ("i2c: add ACPI support for I2C mux ports") In the i2c-piix4 driver the adapters are enumerated as: Main SMBus adapter Port 0, Port 2, ..., aux port (i.e., ASF adapter) However, in the AMD BKDG documentation[1], the implied order of ports is: Main SMBus adapter Port 0, ASF adapter, Port 2, Port 3, ... This ordering difference is unfortunate, and we assume that ACPI developers will use the Linux ordering. [1] 52740 BIOS and Kernel Developer's Guide (BKDG) for AMD Family 16h Models 30h-3Fh Processors Signed-off-by: Andrew Cooks Reviewed-by: Andy Shevchenko --- drivers/i2c/busses/i2c-piix4.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 9763241..97eb6ae 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -843,6 +843,12 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba, /* set up the sysfs linkage to our parent device */ adap->dev.parent = &dev->dev; + if (has_acpi_companion(&dev->dev)) { + acpi_preset_companion(&adap->dev, + ACPI_COMPANION(&dev->dev), + piix4_adapter_count++); + } + snprintf(adap->name, sizeof(adap->name), "SMBus PIIX4 adapter%s at %04x", name, smba);