freebsd-skq/sys/contrib/alpine-hal/al_hal_plat_services.h

/*-
*******************************************************************************
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*******************************************************************************/

/**
 * @defgroup group_services Platform Services API
 *  @{
 * The Platform Services API provides miscellaneous system services to HAL
 * drivers, such as:
 * - Registers read/write
 * - Assertions
 * - Memory barriers
 * - Endianness conversions
 *
 * And more.
 * @file   plat_api/sample/al_hal_plat_services.h
 *
 * @brief  API for Platform services provided for to HAL drivers
 *
 *
 */

#ifndef __PLAT_SERVICES_H__
#define __PLAT_SERVICES_H__

#include <machine/atomic.h>
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/bus.h>

/* Prototypes for all the bus_space structure functions */
uint8_t	generic_bs_r_1(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset);

uint16_t generic_bs_r_2(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset);

uint32_t generic_bs_r_4(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset);

void generic_bs_w_1(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset, uint8_t value);

void generic_bs_w_2(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset, uint16_t value);

void generic_bs_w_4(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset, uint32_t value);

void generic_bs_w_8(bus_space_tag_t t, bus_space_handle_t bsh,
    bus_size_t offset, uint64_t value);

#define __UNUSED __attribute__((unused))

/* *INDENT-OFF* */
#ifdef __cplusplus
extern "C" {
#endif
/* *INDENT-ON* */

/**
  * Make sure data will be visible by other masters (other CPUS and DMA).
  * usually this is achieved by the ARM DMB instruction.
  */
static void al_data_memory_barrier(void);
static void al_smp_data_memory_barrier(void);

/**
  * Make sure data will be visible by DMA masters, no restriction for other cpus
  */
static inline void
al_data_memory_barrier(void)
{
#ifndef __aarch64__
	dsb();
#else
	dsb(sy);
#endif
}

/**
  * Make sure data will be visible in order by other cpus masters.
  */
static inline void
al_smp_data_memory_barrier(void)
{
#ifndef __aarch64__
	dmb();
#else
	dmb(ish);
#endif
}

/**
  * Make sure write data will be visible in order by other cpus masters.
  */
static inline void
al_local_data_memory_barrier(void)
{
#ifndef __aarch64__
	dsb();
#else
	dsb(sy);
#endif
}

/*
 * WMA: This is a hack which allows not modifying the __iomem accessing HAL code.
 * On ARMv7, bus_handle holds the information about VA of accessed memory. It
 * is possible to use direct load/store instruction instead of bus_dma machinery.
 * WARNING: This is not guaranteed to stay that way forever, nor that
 * on other architectures these variables behave similarly. Keep that
 * in mind during porting to other systems.
 */
/**
 * Read MMIO 8 bits register
 * @param  offset	register offset
 *
 * @return register value
 */
static uint8_t al_reg_read8(uint8_t * offset);

/**
 * Read MMIO 16 bits register
 * @param  offset	register offset
 *
 * @return register value
 */
static uint16_t al_reg_read16(uint16_t * offset);

/**
 * Read MMIO 32 bits register
 * @param  offset	register offset
 *
 * @return register value
 */
static uint32_t al_reg_read32(uint32_t * offset);

/**
 * Read MMIO 64 bits register
 * @param  offset	register offset
 *
 * @return register value
 */
uint64_t al_reg_read64(uint64_t * offset);

/**
 * Relaxed read MMIO 32 bits register
 *
 * Relaxed register read/write functions don't involve cpu instructions that
 * force syncronization, nor ordering between the register access and memory
 * data access.
 * These instructions are used in performance critical code to avoid the
 * overhead of the synchronization instructions.
 *
 * @param  offset	register offset
 *
 * @return register value
 */
#define al_bus_dma_to_va(bus_tag, bus_handle)	((void*)bus_handle)

/**
 * Relaxed read MMIO 32 bits register
 *
 * Relaxed register read/write functions don't involve cpu instructions that
 * force syncronization, nor ordering between the register access and memory
 * data access.
 * These instructions are used in performance critical code to avoid the
 * overhead of the synchronization instructions.
 *
 * @param  offset	register offset
 *
 * @return register value
 */
#define al_reg_read32_relaxed(l)	generic_bs_r_4(NULL, (bus_space_handle_t)l, 0)

/**
 * Relaxed write to MMIO 32 bits register
 *
 * Relaxed register read/write functions don't involve cpu instructions that
 * force syncronization, nor ordering between the register access and memory
 * data access.
 * These instructions are used in performance critical code to avoid the
 * overhead of the synchronization instructions.
 *
 * @param  offset	register offset
 * @param  val		value to write to the register
 */
#define al_reg_write32_relaxed(l,v)	generic_bs_w_4(NULL, (bus_space_handle_t)l, 0, v)

/**
 * Write to MMIO 8 bits register
 * @param  offset	register offset
 * @param  val		value to write to the register
 */
#define al_reg_write8(l, v) do {				\
	al_data_memory_barrier();				\
	generic_bs_w_1(NULL, (bus_space_handle_t)l, 0, v);	\
	al_smp_data_memory_barrier();				\
} while (0)

/**
 * Write to MMIO 16 bits register
 * @param  offset	register offset
 * @param  val		value to write to the register
 */
#define al_reg_write16(l, v) do {				\
	al_data_memory_barrier();				\
	generic_bs_w_2(NULL, (bus_space_handle_t)l, 0, v);	\
	al_smp_data_memory_barrier();				\
} while (0)

/**
 * Write to MMIO 32 bits register
 * @param  offset	register offset
 * @param  val		value to write to the register
 */
#define al_reg_write32(l, v) do {				\
	al_data_memory_barrier();				\
	generic_bs_w_4(NULL, (bus_space_handle_t)l, 0, v);	\
	al_smp_data_memory_barrier();				\
} while (0)

/**
 * Write to MMIO 64 bits register
 * @param  offset	register offset
 * @param  val		value to write to the register
 */
#define al_reg_write64(l, v) do {				\
	al_data_memory_barrier();				\
	generic_bs_w_8(NULL, (bus_space_handle_t)l, 0, v);	\
	al_smp_data_memory_barrier();				\
} while (0)

static inline uint8_t
al_reg_read8(uint8_t *l)
{

	al_data_memory_barrier();
	return (generic_bs_r_1(NULL, (bus_space_handle_t)l, 0));
}

static inline uint16_t
al_reg_read16(uint16_t *l)
{

	al_data_memory_barrier();
	return (generic_bs_r_2(NULL, (bus_space_handle_t)l, 0));
}

static inline uint32_t
al_reg_read32(uint32_t *l)
{

	al_data_memory_barrier();
	return (generic_bs_r_4(NULL, (bus_space_handle_t)l, 0));
}

#define AL_DBG_LEVEL_NONE 0
#define AL_DBG_LEVEL_ERR 1
#define AL_DBG_LEVEL_WARN 2
#define AL_DBG_LEVEL_INFO 3
#define AL_DBG_LEVEL_DBG 4

#define AL_DBG_LEVEL AL_DBG_LEVEL_ERR

#define AL_DBG_LOCK()
#define AL_DBG_UNLOCK()

/**
 * print message
 *
 * @param format The format string
 * @param ... Additional arguments
 */
#define al_print(type, fmt, ...) 		do { if (AL_DBG_LEVEL >= AL_DBG_LEVEL_NONE) { AL_DBG_LOCK(); printf(fmt, ##__VA_ARGS__); AL_DBG_UNLOCK(); } } while(0)

/**
 * print error message
 *
 * @param format
 */
#define al_err(...)			do { if (AL_DBG_LEVEL >= AL_DBG_LEVEL_ERR) { AL_DBG_LOCK(); printf(__VA_ARGS__); AL_DBG_UNLOCK(); } } while(0)

/**
 * print warning message
 *
 * @param format
 */
#define al_warn(...)			do { if (AL_DBG_LEVEL >= AL_DBG_LEVEL_WARN) { AL_DBG_LOCK(); printf(__VA_ARGS__); AL_DBG_UNLOCK(); } } while(0)

/**
 * print info message
 *
 * @param format
 */
#define al_info(...)			do { if (AL_DBG_LEVEL >= AL_DBG_LEVEL_INFO) { AL_DBG_LOCK(); printf(__VA_ARGS__); AL_DBG_UNLOCK(); } } while(0)

/**
 * print debug message
 *
 * @param format
 */
#define al_dbg(...)			do { if (AL_DBG_LEVEL >= AL_DBG_LEVEL_DBG) { AL_DBG_LOCK(); printf(__VA_ARGS__); AL_DBG_UNLOCK(); } } while(0)

/**
 * Assertion
 *
 * @param condition
 */
#define al_assert(COND)		\
	do {			\
		if (!(COND))	\
			al_err(	\
			"%s:%d:%s: Assertion failed! (%s)\n",	\
			__FILE__, __LINE__, __func__, #COND);	\
	} while(AL_FALSE)

/**
 * al_udelay - micro sec delay
 */
#define al_udelay(u)		DELAY(u)

/**
 * al_msleep - mili sec delay
 */
#define al_msleep(m)		DELAY((m) * 1000)

/**
 * swap half word to little endian
 *
 * @param x 16 bit value
 *
 * @return the value in little endian
 */
#define swap16_to_le(x)		htole16(x)
/**
 * swap word to little endian
 *
 * @param x 32 bit value
 *
 * @return the value in little endian
 */
#define swap32_to_le(x)		htole32(x)

/**
 * swap 8 bytes to little endian
 *
 * @param x 64 bit value
 *
 * @return the value in little endian
 */
#define swap64_to_le(x)		htole64(x)

/**
 * swap half word from little endian
 *
 * @param x 16 bit value
 *
 * @return the value in the cpu endianess
 */
#define swap16_from_le(x)	le16toh(x)

/**
 * swap word from little endian
 *
 * @param x 32 bit value
 *
 * @return the value in the cpu endianess
 */
#define swap32_from_le(x)	le32toh(x)

/**
 * swap 8 bytes from little endian
 *
 * @param x 64 bit value
 *
 * @return the value in the cpu endianess
 */
#define swap64_from_le(x)	le64toh(x)

/**
 * Memory set
 *
 * @param p memory pointer
 * @param val value for setting
 * @param cnt number of bytes to set
 */
#define al_memset(p, val, cnt)	memset(p, val, cnt)

/**
 * Memory copy
 *
 * @param p1 memory pointer
 * @param p2 memory pointer
 * @param cnt number of bytes to copy
 */
#define al_memcpy(p1, p2, cnt)	memcpy(p1, p2, cnt)

/**
 * Memory compare
 *
 * @param p1 memory pointer
 * @param p2 memory pointer
 * @param cnt number of bytes to compare
 */
#define al_memcmp(p1, p2, cnt)	memcmp(p1, p2, cnt)

/**
 * String compare
 *
 * @param s1 string pointer
 * @param s2 string pointer
 */
#define al_strcmp(s1, s2)	strcmp(s1, s2)

#define al_get_cpu_id()		0

/* *INDENT-OFF* */
#ifdef __cplusplus
}
#endif
/* *INDENT-ON* */
/** @} end of Platform Services API group */
#endif				/* __PLAT_SERVICES_H__ */