max80_fw/fw/iodev.h

#ifndef IODEV_H
#define IODEV_H

/* Address for I/O device d, subregister r */
#define IODEVA(d,r) (0xfffffc00+((d) << 6)+((r) << 2))

#ifdef __ASSEMBLY__

/*
 * The I/O device range is designed so that it can be addressed via
 * negative offsets from the zero register, so no explicit base
 * pointer register is necesary.
 */
#define IODEVV(d,r) IODEVA(d,r)(zero)
#define IODEVB(d,r) IODEVV(d,r)
#define IODEVH(d,r) IODEVV(d,r)
#define IODEVL(d,r) IODEVV(d,r)

#else

#include <stdint.h>

/* Writable registers */
#define IODEVV(d,r) (*(volatile void     *)IODEVA(d,r))
#define IODEVB(d,r) (*(volatile uint8_t  *)IODEVA(d,r))
#define IODEVH(d,r) (*(volatile uint16_t *)IODEVA(d,r))
#define IODEVL(d,r) (*(volatile uint32_t *)IODEVA(d,r))

/* Readonly registers */
#define IODEVRV(d,r) (*(const volatile void     *)IODEVA(d,r))
#define IODEVRB(d,r) (*(const volatile uint8_t  *)IODEVA(d,r))
#define IODEVRH(d,r) (*(const volatile uint16_t *)IODEVA(d,r))
#define IODEVRL(d,r) (*(const volatile uint32_t *)IODEVA(d,r))

#endif

#define CPU_CLK_HZ	84000000

#define LED		IODEVB(0,0)
#define CONSOLE		IODEVB(1,0)
#define CON_BAUDDIV	IODEVL(1,1)
#define CON_BAUD_BASE	(48000000U >> 4)

#endif /* IODEV_H */