diff options
Diffstat (limited to 'src/southbridge/intel/i82801cx/early_smbus.c')
-rw-r--r-- | src/southbridge/intel/i82801cx/early_smbus.c | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/src/southbridge/intel/i82801cx/early_smbus.c b/src/southbridge/intel/i82801cx/early_smbus.c deleted file mode 100644 index 5be63537af..0000000000 --- a/src/southbridge/intel/i82801cx/early_smbus.c +++ /dev/null @@ -1,134 +0,0 @@ -#include <device/pci_ids.h> -#include "i82801cx.h" - -static void enable_smbus(void) -{ - device_t dev = PCI_DEV(0x0, 0x1f, 0x3); - - printk(BIOS_DEBUG, "SMBus controller enabled\n"); - /* set smbus iobase */ - pci_write_config32(dev, SMB_BASE, SMBUS_IO_BASE | PCI_BASE_ADDRESS_SPACE_IO); - /* Set smbus enable */ - pci_write_config8(dev, HOSTC, HST_EN); - /* Set smbus iospace enable */ - pci_write_config16(dev, PCI_COMMAND, PCI_COMMAND_IO); - /* Disable interrupt generation */ - outb(0, SMBUS_IO_BASE + SMBHSTCTL); - /* clear any lingering errors, so the transaction will run */ - outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); -} - - -static inline void smbus_delay(void) -{ - outb(0x80, 0x80); -} - -// See http://www.coreboot.org/pipermail/linuxbios/2004-September/009077.html -// for a description of this function. -static int smbus_wait_until_active(void) -{ - unsigned long loops; - loops = SMBUS_TIMEOUT; - do { - unsigned char val; - smbus_delay(); - val = inb(SMBUS_IO_BASE + SMBHSTSTAT); - if ((val & 1)) { - break; - } - } while (--loops); - return loops ? 0 : -4; -} - -static int smbus_wait_until_ready(void) -{ - unsigned long loops; - loops = SMBUS_TIMEOUT; - do { - unsigned char val; - smbus_delay(); - val = inb(SMBUS_IO_BASE + SMBHSTSTAT); - // !HOST_BUSY? - if ((val & 1) == 0) { - break; - } - if(loops == (SMBUS_TIMEOUT / 2)) { - // Clear status flags - outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), - SMBUS_IO_BASE + SMBHSTSTAT); - } - } while(--loops); - return loops?0:-2; -} - -static int smbus_wait_until_done(void) -{ - unsigned long loops; - loops = SMBUS_TIMEOUT; - do { - unsigned char val; - smbus_delay(); - - val = inb(SMBUS_IO_BASE + SMBHSTSTAT); - // !HOST_BUSY? - if ( (val & 1) == 0) { - break; - } - // BYTE_DONE or SUCCESS or error? - if ((val & ~((1<<6)|(1<<0)) ) != 0 ) { - break; - } - } while(--loops); - return loops?0:-3; -} - -static int smbus_read_byte(unsigned device, unsigned address) -{ - unsigned char global_control_register; - unsigned char global_status_register; - unsigned char byte; - - if (smbus_wait_until_ready() < 0) { - return -2; - } - - /* setup transaction */ - /* disable interrupts */ - outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xfe, SMBUS_IO_BASE + SMBHSTCTL); - /* set to read from the specified device */ - outb(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBXMITADD); - /* set the command/address... */ - outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD); - /* set up for a byte data read */ - outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xe3) | (0x2<<2), SMBUS_IO_BASE + SMBHSTCTL); - - /* clear any lingering errors, so the transaction will run */ - outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); - - /* clear the data byte...*/ - outb(0, SMBUS_IO_BASE + SMBHSTDAT0); - - /* start a byte read, with interrupts disabled */ - outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40), SMBUS_IO_BASE + SMBHSTCTL); - /* poll for it to start */ - if (smbus_wait_until_active() < 0) { - return -4; - } - - /* poll for transaction completion */ - if (smbus_wait_until_done() < 0) { - return -3; - } - - global_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT) & ~(1<<6); /* Ignore the In Use Status... */ - - /* read results of transaction */ - byte = inb(SMBUS_IO_BASE + SMBHSTDAT0); - - // SUCCESS? - if (global_status_register != 2) { - return -1; - } - return byte; -} |