ifx_gpio.h

Switch,Ic,driver,英飛凌6996m驅動程式,包括bandwidth-control以及basic-control功能

#ifndef _IFX_GPIO_H_
#define _IFX_GPIO_H_

// define the base address for the switch controller embedded in ADM5120 and for reference only
#define SWI_CTRL_BASE           0x12000000  // must be modified according to the switch controller base address on the customer board

// define the GPIO config register address in ADM5120 and for reference only
#define IFX_GPIO_CFG_REG0       0x00B8      // must be modified according to the GPIO register address on the customer board

#define IFX_GPIO0_INPUT_MASK    0x00000100  // must be modified according to the GPIO mask value on the customer board

/* GPIO 012 enabled, output mode */
#define GPIO_ENABLEBITS         0x000700f8  // must be modified according to the GPIO enable/output setting on the customer board

/* 
  define ADM5120 GPIO port to ADM6996I/M SMI interface
  MDIO -> EEDI (GPIO 0, bi-direction)
  MDCS -> EECS (GPIO 1, output only)
  MDC  -> EESK (GPIO 2, output only)
          EEDO (do not need this one!)
*/
// these definitions must be modified according to the defined access pins to the switch controller on the customer board
#define GPIO_MDIO       0
#define GPIO_MDCS       1
#define GPIO_MDC        2

#define MDIO_INPUT      0x00000001
#define MDIO_OUTPUT_EN  0x00010000

// this macro must be modified according to the system low-level I/O access method on the customer board
/* Macros for accessing the switch control registers */
#define IFX_SW_REG(_reg)		\
	(*((volatile unsigned long *)(KSEG1ADDR(SWI_CTRL_BASE + (_reg)))))

// if you are using the GPIO as the read/write pins to access the switch controller, you can use these macros listed below
// otherwise, please use the self-defined I/O access macros to read/write the switch controller
#define MDIO_SET_HIGH(num) \
do { \
	IFX_SW_REG(IFX_GPIO_CFG_REG0) |= 1 << (24 + num); \
} while (0)

#define MDIO_SET_LOW(num) \
do { \
	IFX_SW_REG(IFX_GPIO_CFG_REG0) &= ~(1 << (24 + num)); \
} while (0)

/* 
  initialize GPIO pins. 
  output mode, low 
*/
void ifx_gpio_init(void)
{
  IFX_SW_REG(IFX_GPIO_CFG_REG0) = GPIO_ENABLEBITS;
  
  return;
}

/* read one bit from mdio port */
int ifx_sw_mdio_readbit(void)
{
  int val;
  
  val = (IFX_SW_REG(IFX_GPIO_CFG_REG0) & IFX_GPIO0_INPUT_MASK) >> 8;
  
  return val;
}

/* 
  MDIO mode selection
  1 -> output
  0 -> input
  
  switch input/output mode of GPIO 0
*/
void ifx_mdio_mode(int mode)
{
  IFX_SW_REG(IFX_GPIO_CFG_REG0) = mode ? GPIO_ENABLEBITS : ((GPIO_ENABLEBITS | MDIO_INPUT) & ~MDIO_OUTPUT_EN);
}
  
void ifx_mdc_hi(void)
{
  MDIO_SET_HIGH(GPIO_MDC);
}

void ifx_mdio_hi(void)
{
  MDIO_SET_HIGH(GPIO_MDIO);
}

void ifx_mdcs_hi(void)
{
  MDIO_SET_HIGH(GPIO_MDCS);
}

void ifx_mdc_lo(void)
{
  MDIO_SET_LOW(GPIO_MDC);
}

void ifx_mdio_lo(void)
{
  MDIO_SET_LOW(GPIO_MDIO);
}

void ifx_mdcs_lo(void)
{
  MDIO_SET_LOW(GPIO_MDCS);
}

#endif
/* _IFX_GPIO_H_ */