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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- Copyright (c) 1998 - 2002 Frodo Looijaard <[email protected]> and
- Philip Edelbrock <[email protected]>
- */
- /*
- Supports:
- Intel PIIX4, 440MX
- Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
- ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
- AMD Hudson-2, ML, CZ
- Hygon CZ
- SMSC Victory66
- 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>
- #include <linux/moduleparam.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/slab.h>
- #include <linux/dmi.h>
- #include <linux/acpi.h>
- #include <linux/io.h>
- /* PIIX4 SMBus address offsets */
- #define SMBHSTSTS (0 + piix4_smba)
- #define SMBHSLVSTS (1 + piix4_smba)
- #define SMBHSTCNT (2 + piix4_smba)
- #define SMBHSTCMD (3 + piix4_smba)
- #define SMBHSTADD (4 + piix4_smba)
- #define SMBHSTDAT0 (5 + piix4_smba)
- #define SMBHSTDAT1 (6 + piix4_smba)
- #define SMBBLKDAT (7 + piix4_smba)
- #define SMBSLVCNT (8 + piix4_smba)
- #define SMBSHDWCMD (9 + piix4_smba)
- #define SMBSLVEVT (0xA + piix4_smba)
- #define SMBSLVDAT (0xC + piix4_smba)
- /* count for request_region */
- #define SMBIOSIZE 9
- /* PCI Address Constants */
- #define SMBBA 0x090
- #define SMBHSTCFG 0x0D2
- #define SMBSLVC 0x0D3
- #define SMBSHDW1 0x0D4
- #define SMBSHDW2 0x0D5
- #define SMBREV 0x0D6
- /* Other settings */
- #define MAX_TIMEOUT 500
- #define ENABLE_INT9 0
- /* PIIX4 constants */
- #define PIIX4_QUICK 0x00
- #define PIIX4_BYTE 0x04
- #define PIIX4_BYTE_DATA 0x08
- #define PIIX4_WORD_DATA 0x0C
- #define PIIX4_BLOCK_DATA 0x14
- /* Multi-port constants */
- #define PIIX4_MAX_ADAPTERS 4
- #define HUDSON2_MAIN_PORTS 2 /* HUDSON2, KERNCZ reserves ports 3, 4 */
- /* SB800 constants */
- #define SB800_PIIX4_SMB_IDX 0xcd6
- #define SB800_PIIX4_SMB_MAP_SIZE 2
- #define KERNCZ_IMC_IDX 0x3e
- #define KERNCZ_IMC_DATA 0x3f
- /*
- * SB800 port is selected by bits 2:1 of the smb_en register (0x2c)
- * or the smb_sel register (0x2e), depending on bit 0 of register 0x2f.
- * Hudson-2/Bolton port is always selected by bits 2:1 of register 0x2f.
- */
- #define SB800_PIIX4_PORT_IDX 0x2c
- #define SB800_PIIX4_PORT_IDX_ALT 0x2e
- #define SB800_PIIX4_PORT_IDX_SEL 0x2f
- #define SB800_PIIX4_PORT_IDX_MASK 0x06
- #define SB800_PIIX4_PORT_IDX_SHIFT 1
- /* 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
- #define SB800_PIIX4_FCH_PM_ADDR 0xFED80300
- #define SB800_PIIX4_FCH_PM_SIZE 8
- /* insmod parameters */
- /* If force is set to anything different from 0, we forcibly enable the
- PIIX4. DANGEROUS! */
- static int force;
- module_param (force, int, 0);
- MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
- /* If force_addr is set to anything different from 0, we forcibly enable
- the PIIX4 at the given address. VERY DANGEROUS! */
- static int force_addr;
- module_param_hw(force_addr, int, ioport, 0);
- MODULE_PARM_DESC(force_addr,
- "Forcibly enable the PIIX4 at the given address. "
- "EXTREMELY DANGEROUS!");
- static int srvrworks_csb5_delay;
- static struct pci_driver piix4_driver;
- static const struct dmi_system_id piix4_dmi_blacklist[] = {
- {
- .ident = "Sapphire AM2RD790",
- .matches = {
- DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
- DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
- },
- },
- {
- .ident = "DFI Lanparty UT 790FX",
- .matches = {
- DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
- DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
- },
- },
- { }
- };
- /* The IBM entry is in a separate table because we only check it
- on Intel-based systems */
- static const struct dmi_system_id piix4_dmi_ibm[] = {
- {
- .ident = "IBM",
- .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
- },
- { },
- };
- /*
- * SB800 globals
- */
- static u8 piix4_port_sel_sb800;
- static u8 piix4_port_mask_sb800;
- static u8 piix4_port_shift_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 sb800_mmio_cfg {
- void __iomem *addr;
- bool use_mmio;
- };
- struct i2c_piix4_adapdata {
- unsigned short smba;
- /* SB800 */
- bool sb800_main;
- bool notify_imc;
- u8 port; /* Port number, shifted */
- struct sb800_mmio_cfg mmio_cfg;
- };
- static int piix4_sb800_region_request(struct device *dev,
- struct sb800_mmio_cfg *mmio_cfg)
- {
- if (mmio_cfg->use_mmio) {
- void __iomem *addr;
- if (!request_mem_region_muxed(SB800_PIIX4_FCH_PM_ADDR,
- SB800_PIIX4_FCH_PM_SIZE,
- "sb800_piix4_smb")) {
- dev_err(dev,
- "SMBus base address memory region 0x%x already in use.\n",
- SB800_PIIX4_FCH_PM_ADDR);
- return -EBUSY;
- }
- addr = ioremap(SB800_PIIX4_FCH_PM_ADDR,
- SB800_PIIX4_FCH_PM_SIZE);
- if (!addr) {
- release_mem_region(SB800_PIIX4_FCH_PM_ADDR,
- SB800_PIIX4_FCH_PM_SIZE);
- dev_err(dev, "SMBus base address mapping failed.\n");
- return -ENOMEM;
- }
- mmio_cfg->addr = addr;
- return 0;
- }
- if (!request_muxed_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE,
- "sb800_piix4_smb")) {
- dev_err(dev,
- "SMBus base address index region 0x%x already in use.\n",
- SB800_PIIX4_SMB_IDX);
- return -EBUSY;
- }
- return 0;
- }
- static void piix4_sb800_region_release(struct device *dev,
- struct sb800_mmio_cfg *mmio_cfg)
- {
- if (mmio_cfg->use_mmio) {
- iounmap(mmio_cfg->addr);
- release_mem_region(SB800_PIIX4_FCH_PM_ADDR,
- SB800_PIIX4_FCH_PM_SIZE);
- return;
- }
- release_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE);
- }
- static bool piix4_sb800_use_mmio(struct pci_dev *PIIX4_dev)
- {
- /*
- * cd6h/cd7h port I/O accesses can be disabled on AMD processors
- * w/ SMBus PCI revision ID 0x51 or greater. MMIO is supported on
- * the same processors and is the recommended access method.
- */
- return (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
- PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
- PIIX4_dev->revision >= 0x51);
- }
- static int piix4_setup(struct pci_dev *PIIX4_dev,
- const struct pci_device_id *id)
- {
- unsigned char temp;
- unsigned short piix4_smba;
- if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
- (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
- srvrworks_csb5_delay = 1;
- /* On some motherboards, it was reported that accessing the SMBus
- caused severe hardware problems */
- if (dmi_check_system(piix4_dmi_blacklist)) {
- dev_err(&PIIX4_dev->dev,
- "Accessing the SMBus on this system is unsafe!\n");
- return -EPERM;
- }
- /* Don't access SMBus on IBM systems which get corrupted eeproms */
- if (dmi_check_system(piix4_dmi_ibm) &&
- PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
- dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
- "may corrupt your serial eeprom! Refusing to load "
- "module!\n");
- return -EPERM;
- }
- /* Determine the address of the SMBus areas */
- if (force_addr) {
- piix4_smba = force_addr & 0xfff0;
- force = 0;
- } else {
- pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
- piix4_smba &= 0xfff0;
- if(piix4_smba == 0) {
- dev_err(&PIIX4_dev->dev, "SMBus base address "
- "uninitialized - upgrade BIOS or use "
- "force_addr=0xaddr\n");
- return -ENODEV;
- }
- }
- if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
- return -ENODEV;
- if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
- dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
- piix4_smba);
- return -EBUSY;
- }
- pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
- /* If force_addr is set, we program the new address here. Just to make
- sure, we disable the PIIX4 first. */
- if (force_addr) {
- pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
- pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
- pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
- dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
- "new address %04x!\n", piix4_smba);
- } else if ((temp & 1) == 0) {
- if (force) {
- /* This should never need to be done, but has been
- * noted that many Dell machines have the SMBus
- * interface on the PIIX4 disabled!? NOTE: This assumes
- * I/O space and other allocations WERE done by the
- * Bios! Don't complain if your hardware does weird
- * things after enabling this. :') Check for Bios
- * updates before resorting to this.
- */
- pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
- temp | 1);
- dev_notice(&PIIX4_dev->dev,
- "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
- } else {
- dev_err(&PIIX4_dev->dev,
- "SMBus Host Controller not enabled!\n");
- release_region(piix4_smba, SMBIOSIZE);
- return -ENODEV;
- }
- }
- if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
- dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
- else if ((temp & 0x0E) == 0)
- dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
- else
- dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
- "(or code out of date)!\n");
- pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
- dev_info(&PIIX4_dev->dev,
- "SMBus Host Controller at 0x%x, revision %d\n",
- piix4_smba, temp);
- return piix4_smba;
- }
- static int piix4_setup_sb800_smba(struct pci_dev *PIIX4_dev,
- u8 smb_en,
- u8 aux,
- u8 *smb_en_status,
- unsigned short *piix4_smba)
- {
- struct sb800_mmio_cfg mmio_cfg;
- u8 smba_en_lo;
- u8 smba_en_hi;
- int retval;
- mmio_cfg.use_mmio = piix4_sb800_use_mmio(PIIX4_dev);
- retval = piix4_sb800_region_request(&PIIX4_dev->dev, &mmio_cfg);
- if (retval)
- return retval;
- if (mmio_cfg.use_mmio) {
- smba_en_lo = ioread8(mmio_cfg.addr);
- smba_en_hi = ioread8(mmio_cfg.addr + 1);
- } else {
- 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);
- }
- piix4_sb800_region_release(&PIIX4_dev->dev, &mmio_cfg);
- if (!smb_en) {
- *smb_en_status = smba_en_lo & 0x10;
- *piix4_smba = smba_en_hi << 8;
- if (aux)
- *piix4_smba |= 0x20;
- } else {
- *smb_en_status = smba_en_lo & 0x01;
- *piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
- }
- if (!*smb_en_status) {
- dev_err(&PIIX4_dev->dev,
- "SMBus Host Controller not enabled!\n");
- return -ENODEV;
- }
- return 0;
- }
- static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
- const struct pci_device_id *id, u8 aux)
- {
- unsigned short piix4_smba;
- u8 smb_en, smb_en_status, port_sel;
- u8 i2ccfg, i2ccfg_offset = 0x10;
- struct sb800_mmio_cfg mmio_cfg;
- int retval;
- /* SB800 and later SMBus does not support forcing address */
- if (force || force_addr) {
- dev_err(&PIIX4_dev->dev, "SMBus does not support "
- "forcing address!\n");
- return -EINVAL;
- }
- /* Determine the address of the SMBus areas */
- if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
- PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
- PIIX4_dev->revision >= 0x41) ||
- (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
- PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
- PIIX4_dev->revision >= 0x49) ||
- (PIIX4_dev->vendor == PCI_VENDOR_ID_HYGON &&
- PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS))
- smb_en = 0x00;
- else
- smb_en = (aux) ? 0x28 : 0x2c;
- retval = piix4_setup_sb800_smba(PIIX4_dev, smb_en, aux, &smb_en_status,
- &piix4_smba);
- if (retval)
- return retval;
- if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
- return -ENODEV;
- if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
- dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
- piix4_smba);
- return -EBUSY;
- }
- /* Aux SMBus does not support IRQ information */
- if (aux) {
- dev_info(&PIIX4_dev->dev,
- "Auxiliary SMBus Host Controller at 0x%x\n",
- piix4_smba);
- return piix4_smba;
- }
- /* Request the SMBus I2C bus config region */
- if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
- dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
- "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
- release_region(piix4_smba, SMBIOSIZE);
- return -EBUSY;
- }
- i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
- release_region(piix4_smba + i2ccfg_offset, 1);
- if (i2ccfg & 1)
- dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
- else
- dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
- dev_info(&PIIX4_dev->dev,
- "SMBus Host Controller at 0x%x, revision %d\n",
- piix4_smba, i2ccfg >> 4);
- /* Find which register is used for port selection */
- if (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD ||
- PIIX4_dev->vendor == PCI_VENDOR_ID_HYGON) {
- 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;
- } 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;
- }
- } else {
- mmio_cfg.use_mmio = piix4_sb800_use_mmio(PIIX4_dev);
- retval = piix4_sb800_region_request(&PIIX4_dev->dev, &mmio_cfg);
- if (retval) {
- release_region(piix4_smba, SMBIOSIZE);
- return retval;
- }
- outb_p(SB800_PIIX4_PORT_IDX_SEL, SB800_PIIX4_SMB_IDX);
- port_sel = inb_p(SB800_PIIX4_SMB_IDX + 1);
- piix4_port_sel_sb800 = (port_sel & 0x01) ?
- SB800_PIIX4_PORT_IDX_ALT :
- SB800_PIIX4_PORT_IDX;
- piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
- piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
- piix4_sb800_region_release(&PIIX4_dev->dev, &mmio_cfg);
- }
- dev_info(&PIIX4_dev->dev,
- "Using register 0x%02x for SMBus port selection\n",
- (unsigned int)piix4_port_sel_sb800);
- return piix4_smba;
- }
- static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
- const struct pci_device_id *id,
- unsigned short base_reg_addr)
- {
- /* Set up auxiliary SMBus controllers found on some
- * AMD chipsets e.g. SP5100 (SB700 derivative) */
- unsigned short piix4_smba;
- /* Read address of auxiliary SMBus controller */
- pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
- if ((piix4_smba & 1) == 0) {
- dev_dbg(&PIIX4_dev->dev,
- "Auxiliary SMBus controller not enabled\n");
- return -ENODEV;
- }
- piix4_smba &= 0xfff0;
- if (piix4_smba == 0) {
- dev_dbg(&PIIX4_dev->dev,
- "Auxiliary SMBus base address uninitialized\n");
- return -ENODEV;
- }
- if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
- return -ENODEV;
- if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
- dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
- "already in use!\n", piix4_smba);
- return -EBUSY;
- }
- dev_info(&PIIX4_dev->dev,
- "Auxiliary SMBus Host Controller at 0x%x\n",
- piix4_smba);
- return piix4_smba;
- }
- static int piix4_transaction(struct i2c_adapter *piix4_adapter)
- {
- struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter);
- unsigned short piix4_smba = adapdata->smba;
- int temp;
- int result = 0;
- int timeout = 0;
- dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
- "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
- inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
- inb_p(SMBHSTDAT1));
- /* Make sure the SMBus host is ready to start transmitting */
- if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
- dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
- "Resetting...\n", temp);
- outb_p(temp, SMBHSTSTS);
- if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
- dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
- return -EBUSY;
- } else {
- dev_dbg(&piix4_adapter->dev, "Successful!\n");
- }
- }
- /* start the transaction by setting bit 6 */
- outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
- /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
- if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
- usleep_range(2000, 2100);
- else
- usleep_range(250, 500);
- while ((++timeout < MAX_TIMEOUT) &&
- ((temp = inb_p(SMBHSTSTS)) & 0x01))
- usleep_range(250, 500);
- /* If the SMBus is still busy, we give up */
- if (timeout == MAX_TIMEOUT) {
- dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
- result = -ETIMEDOUT;
- }
- if (temp & 0x10) {
- result = -EIO;
- dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
- }
- if (temp & 0x08) {
- result = -EIO;
- dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
- "locked until next hard reset. (sorry!)\n");
- /* Clock stops and slave is stuck in mid-transmission */
- }
- if (temp & 0x04) {
- result = -ENXIO;
- dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
- }
- if (inb_p(SMBHSTSTS) != 0x00)
- outb_p(inb(SMBHSTSTS), SMBHSTSTS);
- if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
- dev_err(&piix4_adapter->dev, "Failed reset at end of "
- "transaction (%02x)\n", temp);
- }
- dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
- "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
- inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
- inb_p(SMBHSTDAT1));
- return result;
- }
- /* Return negative errno on error. */
- static s32 piix4_access(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);
- unsigned short piix4_smba = adapdata->smba;
- int i, len;
- int status;
- switch (size) {
- case I2C_SMBUS_QUICK:
- outb_p((addr << 1) | read_write,
- SMBHSTADD);
- size = PIIX4_QUICK;
- break;
- case I2C_SMBUS_BYTE:
- outb_p((addr << 1) | read_write,
- SMBHSTADD);
- if (read_write == I2C_SMBUS_WRITE)
- outb_p(command, SMBHSTCMD);
- size = PIIX4_BYTE;
- break;
- case I2C_SMBUS_BYTE_DATA:
- outb_p((addr << 1) | read_write,
- SMBHSTADD);
- outb_p(command, SMBHSTCMD);
- if (read_write == I2C_SMBUS_WRITE)
- outb_p(data->byte, SMBHSTDAT0);
- size = PIIX4_BYTE_DATA;
- break;
- case I2C_SMBUS_WORD_DATA:
- outb_p((addr << 1) | read_write,
- SMBHSTADD);
- outb_p(command, SMBHSTCMD);
- if (read_write == I2C_SMBUS_WRITE) {
- outb_p(data->word & 0xff, SMBHSTDAT0);
- outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
- }
- size = PIIX4_WORD_DATA;
- break;
- case I2C_SMBUS_BLOCK_DATA:
- outb_p((addr << 1) | read_write,
- SMBHSTADD);
- outb_p(command, SMBHSTCMD);
- if (read_write == I2C_SMBUS_WRITE) {
- len = data->block[0];
- if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
- return -EINVAL;
- outb_p(len, SMBHSTDAT0);
- inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
- for (i = 1; i <= len; i++)
- outb_p(data->block[i], SMBBLKDAT);
- }
- size = PIIX4_BLOCK_DATA;
- break;
- default:
- dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
- return -EOPNOTSUPP;
- }
- outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
- status = piix4_transaction(adap);
- if (status)
- return status;
- if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
- return 0;
- switch (size) {
- case PIIX4_BYTE:
- case PIIX4_BYTE_DATA:
- data->byte = inb_p(SMBHSTDAT0);
- break;
- case PIIX4_WORD_DATA:
- data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
- break;
- case PIIX4_BLOCK_DATA:
- data->block[0] = inb_p(SMBHSTDAT0);
- if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
- return -EPROTO;
- inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
- for (i = 1; i <= data->block[0]; i++)
- data->block[i] = inb_p(SMBBLKDAT);
- break;
- }
- return 0;
- }
- static uint8_t piix4_imc_read(uint8_t idx)
- {
- outb_p(idx, KERNCZ_IMC_IDX);
- return inb_p(KERNCZ_IMC_DATA);
- }
- static void piix4_imc_write(uint8_t idx, uint8_t value)
- {
- outb_p(idx, KERNCZ_IMC_IDX);
- outb_p(value, KERNCZ_IMC_DATA);
- }
- static int piix4_imc_sleep(void)
- {
- int timeout = MAX_TIMEOUT;
- if (!request_muxed_region(KERNCZ_IMC_IDX, 2, "smbus_kerncz_imc"))
- return -EBUSY;
- /* clear response register */
- piix4_imc_write(0x82, 0x00);
- /* request ownership flag */
- piix4_imc_write(0x83, 0xB4);
- /* kick off IMC Mailbox command 96 */
- piix4_imc_write(0x80, 0x96);
- while (timeout--) {
- if (piix4_imc_read(0x82) == 0xfa) {
- release_region(KERNCZ_IMC_IDX, 2);
- return 0;
- }
- usleep_range(1000, 2000);
- }
- release_region(KERNCZ_IMC_IDX, 2);
- return -ETIMEDOUT;
- }
- static void piix4_imc_wakeup(void)
- {
- int timeout = MAX_TIMEOUT;
- if (!request_muxed_region(KERNCZ_IMC_IDX, 2, "smbus_kerncz_imc"))
- return;
- /* clear response register */
- piix4_imc_write(0x82, 0x00);
- /* release ownership flag */
- piix4_imc_write(0x83, 0xB5);
- /* kick off IMC Mailbox command 96 */
- piix4_imc_write(0x80, 0x96);
- while (timeout--) {
- if (piix4_imc_read(0x82) == 0xfa)
- break;
- usleep_range(1000, 2000);
- }
- release_region(KERNCZ_IMC_IDX, 2);
- }
- static int piix4_sb800_port_sel(u8 port, struct sb800_mmio_cfg *mmio_cfg)
- {
- u8 smba_en_lo, val;
- if (mmio_cfg->use_mmio) {
- smba_en_lo = ioread8(mmio_cfg->addr + piix4_port_sel_sb800);
- val = (smba_en_lo & ~piix4_port_mask_sb800) | port;
- if (smba_en_lo != val)
- iowrite8(val, mmio_cfg->addr + piix4_port_sel_sb800);
- return (smba_en_lo & piix4_port_mask_sb800);
- }
- outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX);
- smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
- val = (smba_en_lo & ~piix4_port_mask_sb800) | port;
- if (smba_en_lo != val)
- outb_p(val, SB800_PIIX4_SMB_IDX + 1);
- return (smba_en_lo & piix4_port_mask_sb800);
- }
- /*
- * 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);
- unsigned short piix4_smba = adapdata->smba;
- int retries = MAX_TIMEOUT;
- int smbslvcnt;
- u8 prev_port;
- int retval;
- retval = piix4_sb800_region_request(&adap->dev, &adapdata->mmio_cfg);
- if (retval)
- return retval;
- /* Request the SMBUS semaphore, avoid conflicts with the IMC */
- smbslvcnt = inb_p(SMBSLVCNT);
- do {
- outb_p(smbslvcnt | 0x10, SMBSLVCNT);
- /* Check the semaphore status */
- smbslvcnt = inb_p(SMBSLVCNT);
- if (smbslvcnt & 0x10)
- break;
- usleep_range(1000, 2000);
- } while (--retries);
- /* SMBus is still owned by the IMC, we give up */
- if (!retries) {
- retval = -EBUSY;
- goto release;
- }
- /*
- * Notify the IMC (Integrated Micro Controller) if required.
- * Among other responsibilities, the IMC is in charge of monitoring
- * the System fans and temperature sensors, and act accordingly.
- * All this is done through SMBus and can/will collide
- * with our transactions if they are long (BLOCK_DATA).
- * Therefore we need to request the ownership flag during those
- * transactions.
- */
- if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc) {
- int ret;
- ret = piix4_imc_sleep();
- switch (ret) {
- case -EBUSY:
- dev_warn(&adap->dev,
- "IMC base address index region 0x%x already in use.\n",
- KERNCZ_IMC_IDX);
- break;
- case -ETIMEDOUT:
- dev_warn(&adap->dev,
- "Failed to communicate with the IMC.\n");
- break;
- default:
- break;
- }
- /* If IMC communication fails do not retry */
- if (ret) {
- dev_warn(&adap->dev,
- "Continuing without IMC notification.\n");
- adapdata->notify_imc = false;
- }
- }
- prev_port = piix4_sb800_port_sel(adapdata->port, &adapdata->mmio_cfg);
- retval = piix4_access(adap, addr, flags, read_write,
- command, size, data);
- piix4_sb800_port_sel(prev_port, &adapdata->mmio_cfg);
- /* Release the semaphore */
- outb_p(smbslvcnt | 0x20, SMBSLVCNT);
- if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc)
- piix4_imc_wakeup();
- release:
- piix4_sb800_region_release(&adap->dev, &adapdata->mmio_cfg);
- return retval;
- }
- static u32 piix4_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 = piix4_access,
- .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) },
- { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
- { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
- { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
- { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
- { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
- { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
- { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) },
- { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) },
- { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
- PCI_DEVICE_ID_SERVERWORKS_OSB4) },
- { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
- PCI_DEVICE_ID_SERVERWORKS_CSB5) },
- { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
- PCI_DEVICE_ID_SERVERWORKS_CSB6) },
- { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
- PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
- { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
- PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
- { 0, }
- };
- 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,
- u8 hw_port_nr, const char *name,
- struct i2c_adapter **padap)
- {
- struct i2c_adapter *adap;
- struct i2c_piix4_adapdata *adapdata;
- int retval;
- adap = kzalloc(sizeof(*adap), GFP_KERNEL);
- if (adap == NULL) {
- release_region(smba, SMBIOSIZE);
- return -ENOMEM;
- }
- adap->owner = THIS_MODULE;
- adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
- adap->algo = sb800_main ? &piix4_smbus_algorithm_sb800
- : &smbus_algorithm;
- adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
- if (adapdata == NULL) {
- kfree(adap);
- release_region(smba, SMBIOSIZE);
- return -ENOMEM;
- }
- adapdata->mmio_cfg.use_mmio = piix4_sb800_use_mmio(dev);
- adapdata->smba = smba;
- adapdata->sb800_main = sb800_main;
- adapdata->port = port << piix4_port_shift_sb800;
- adapdata->notify_imc = notify_imc;
- /* 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),
- hw_port_nr);
- }
- snprintf(adap->name, sizeof(adap->name),
- "SMBus PIIX4 adapter%s at %04x", name, smba);
- i2c_set_adapdata(adap, adapdata);
- retval = i2c_add_adapter(adap);
- if (retval) {
- kfree(adapdata);
- kfree(adap);
- release_region(smba, SMBIOSIZE);
- return retval;
- }
- *padap = adap;
- return 0;
- }
- static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba,
- bool notify_imc)
- {
- struct i2c_piix4_adapdata *adapdata;
- int port;
- int retval;
- if (dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS ||
- (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
- dev->revision >= 0x1F)) {
- piix4_adapter_count = HUDSON2_MAIN_PORTS;
- } else {
- piix4_adapter_count = PIIX4_MAX_ADAPTERS;
- }
- for (port = 0; port < piix4_adapter_count; port++) {
- u8 hw_port_nr = port == 0 ? 0 : port + 1;
- retval = piix4_add_adapter(dev, smba, true, port, notify_imc,
- hw_port_nr,
- 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_HYGON) {
- bool notify_imc = false;
- is_sb800 = true;
- if ((dev->vendor == PCI_VENDOR_ID_AMD ||
- dev->vendor == PCI_VENDOR_ID_HYGON) &&
- dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) {
- u8 imc;
- /*
- * Detect if IMC is active or not, this method is
- * described on coreboot's AMD IMC notes
- */
- pci_bus_read_config_byte(dev->bus, PCI_DEVFN(0x14, 3),
- 0x40, &imc);
- if (imc & 0x80)
- notify_imc = true;
- }
- /* base address location etc changed in SB800 */
- retval = piix4_setup_sb800(dev, id, 0);
- 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, notify_imc);
- if (retval < 0)
- 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, false, 0, false, 0,
- "", &piix4_main_adapters[0]);
- if (retval < 0)
- return retval;
- piix4_adapter_count = 1;
- }
- /* Check for auxiliary SMBus on some AMD chipsets */
- retval = -ENODEV;
- if (dev->vendor == PCI_VENDOR_ID_ATI &&
- dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) {
- if (dev->revision < 0x40) {
- retval = piix4_setup_aux(dev, id, 0x58);
- } else {
- /* SB800 added aux bus too */
- retval = piix4_setup_sb800(dev, id, 1);
- }
- }
- if (dev->vendor == PCI_VENDOR_ID_AMD &&
- (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS ||
- dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS)) {
- retval = piix4_setup_sb800(dev, id, 1);
- }
- 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, false, 0, false, 1,
- is_sb800 ? piix4_aux_port_name_sb800 : "",
- &piix4_aux_adapter);
- }
- return 0;
- }
- static void piix4_adap_remove(struct i2c_adapter *adap)
- {
- struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
- if (adapdata->smba) {
- i2c_del_adapter(adap);
- if (adapdata->port == (0 << piix4_port_shift_sb800))
- release_region(adapdata->smba, SMBIOSIZE);
- kfree(adapdata);
- kfree(adap);
- }
- }
- static void piix4_remove(struct pci_dev *dev)
- {
- int port = piix4_adapter_count;
- while (--port >= 0) {
- if (piix4_main_adapters[port]) {
- piix4_adap_remove(piix4_main_adapters[port]);
- piix4_main_adapters[port] = NULL;
- }
- }
- if (piix4_aux_adapter) {
- piix4_adap_remove(piix4_aux_adapter);
- piix4_aux_adapter = NULL;
- }
- }
- static struct pci_driver piix4_driver = {
- .name = "piix4_smbus",
- .id_table = piix4_ids,
- .probe = piix4_probe,
- .remove = piix4_remove,
- };
- module_pci_driver(piix4_driver);
- MODULE_AUTHOR("Frodo Looijaard <[email protected]>");
- MODULE_AUTHOR("Philip Edelbrock <[email protected]>");
- MODULE_DESCRIPTION("PIIX4 SMBus driver");
- MODULE_LICENSE("GPL");
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