src/drivers/i2c/i2cmux/i2cmux.c

   1 #include <console/console.h>
   2 #include <device/device.h>
   3 #include <device/smbus.h>
   4 #include <device/pci.h>
   5 #include <device/pci_ids.h>
   6 #include <device/pci_ops.h>
   7 #include <cpu/x86/msr.h>
   8 #include "chip.h"
   9
  10 static void i2cmux_set_link(device_t dev, unsigned int link)
  11 {
  12         if (dev->enabled && dev->path.type == DEVICE_PATH_I2C)
  13         {
  14                 if(ops_smbus_bus(get_pbus_smbus(dev))) {
  15                         smbus_write_byte(dev, 0x01, 1<<link); // output value
  16                         smbus_write_byte(dev, 0x03, 0); // all output
  17                 }
  18
  19         }
  20
  21 }
  22 static void i2cmux_noop(device_t dummy)
  23 {
  24 }
  25
  26 static struct device_operations i2cmux_operations = {
  27         .read_resources   = i2cmux_noop,
  28         .set_resources    = i2cmux_noop,
  29         .enable_resources = i2cmux_noop,
  30         .init             = i2cmux_noop,
  31         .scan_bus         = scan_static_bus,
  32         .set_link         = i2cmux_set_link,
  33 };
  34
  35 static void enable_dev(struct device *dev)
  36 {
  37         if(dev->links>0)
  38                 dev->ops = &i2cmux_operations;
  39 }
  40
  41 struct chip_operations drivers_i2c_i2cmux_ops = {
  42         CHIP_NAME("i2cmux")
  43         .enable_dev = enable_dev,
  44 };