/*

   * (C) Copyright 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com>

   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  
  #include <common.h>
  #include <linux/types.h>
  #include <api_public.h>
  
  #include "glue.h"
  
  static int valid_sig(struct api_signature *sig)
  {
  	uint32_t checksum;
  	struct api_signature s;
  
  	if (sig == NULL)
  		return 0;
  	/*
  	 * Clear the checksum field (in the local copy) so as to calculate the
  	 * CRC with the same initial contents as at the time when the sig was
  	 * produced
  	 */
  	s = *sig;
  	s.checksum = 0;
  
  	checksum = crc32(0, (unsigned char *)&s, sizeof(struct api_signature));
  
  	if (checksum != sig->checksum)
  		return 0;
  
  	return 1;
  }
  
  /*
   * Searches for the U-Boot API signature
   *
   * returns 1/0 depending on found/not found result
   */

  int api_search_sig(struct api_signature **sig)
  {

  	unsigned char *sp;

  	uint32_t search_start = 0;
  	uint32_t search_end = 0;

  
  	if (sig == NULL)
  		return 0;

  	if (search_hint == 0)
  		search_hint = 255 * 1024 * 1024;

  	search_start = search_hint & ~0x000fffff;
  	search_end = search_start + API_SEARCH_LEN - API_SIG_MAGLEN;
  
  	sp = (unsigned char *)search_start;
  	while ((sp + API_SIG_MAGLEN) < (unsigned char *)search_end) {

  		if (!memcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) {
  			*sig = (struct api_signature *)sp;
  			if (valid_sig(*sig))
  				return 1;
  		}
  		sp += API_SIG_MAGLEN;
  	}
  
  	*sig = NULL;
  	return 0;
  }
  
  /****************************************
   *
   * console
   *
   ****************************************/
  
  int ub_getc(void)
  {
  	int c;

  	if (!syscall(API_GETC, NULL, &c))

  		return -1;
  
  	return c;
  }
  
  int ub_tstc(void)
  {
  	int t;

  	if (!syscall(API_TSTC, NULL, &t))

  		return -1;
  
  	return t;
  }
  
  void ub_putc(char c)
  {

  	syscall(API_PUTC, NULL, &c);

  }
  
  void ub_puts(const char *s)
  {

  	syscall(API_PUTS, NULL, s);

  }
  
  /****************************************
   *
   * system
   *
   ****************************************/
  
  void ub_reset(void)
  {
  	syscall(API_RESET, NULL);
  }

  static struct mem_region mr[UB_MAX_MR];

  static struct sys_info si;
  
  struct sys_info * ub_get_sys_info(void)
  {
  	int err = 0;
  
  	memset(&si, 0, sizeof(struct sys_info));
  	si.mr = mr;

  	si.mr_no = UB_MAX_MR;

  	memset(&mr, 0, sizeof(mr));

  	if (!syscall(API_GET_SYS_INFO, &err, &si))

  		return NULL;
  
  	return ((err) ? NULL : &si);
  }
  
  /****************************************
   *
   * timing
   *
   ****************************************/

  void ub_udelay(unsigned long usec)
  {
  	syscall(API_UDELAY, NULL, &usec);
  }
  
  unsigned long ub_get_timer(unsigned long base)
  {
  	unsigned long cur;
  
  	if (!syscall(API_GET_TIMER, NULL, &cur, &base))
  		return 0;
  
  	return cur;
  }
  
  
  /****************************************************************************
   *
   * devices
   *

   * Devices are identified by handles: numbers 0, 1, 2, ..., UB_MAX_DEV-1

   *
   ***************************************************************************/

  static struct device_info devices[UB_MAX_DEV];

  
  struct device_info * ub_dev_get(int i)
  {

  	return ((i < 0 || i >= UB_MAX_DEV) ? NULL : &devices[i]);

  }
  
  /*
   * Enumerates the devices: fills out device_info elements in the devices[]
   * array.
   *
   * returns:		number of devices found
   */
  int ub_dev_enum(void)
  {
  	struct device_info *di;
  	int n = 0;

  	memset(&devices, 0, sizeof(struct device_info) * UB_MAX_DEV);

  	di = &devices[0];
  
  	if (!syscall(API_DEV_ENUM, NULL, di))
  		return 0;
  
  	while (di->cookie != NULL) {

  		if (++n >= UB_MAX_DEV)

  			break;
  
  		/* take another device_info */
  		di++;
  
  		/* pass on the previous cookie */
  		di->cookie = devices[n - 1].cookie;
  
  		if (!syscall(API_DEV_ENUM, NULL, di))
  			return 0;
  	}
  
  	return n;
  }
  
  /*
   * handle:	0-based id of the device
   *
   * returns:	0 when OK, err otherwise
   */
  int ub_dev_open(int handle)
  {
  	struct device_info *di;
  	int err = 0;

  	if (handle < 0 || handle >= UB_MAX_DEV)

  		return API_EINVAL;
  
  	di = &devices[handle];
  
  	if (!syscall(API_DEV_OPEN, &err, di))
  		return -1;
  
  	return err;
  }
  
  int ub_dev_close(int handle)
  {
  	struct device_info *di;

  	if (handle < 0 || handle >= UB_MAX_DEV)

  		return API_EINVAL;
  
  	di = &devices[handle];
  	if (!syscall(API_DEV_CLOSE, NULL, di))
  		return -1;
  
  	return 0;
  }
  
  /*
   *
   * Validates device for read/write, it has to:
   *
   * - have sane handle
   * - be opened
   *
   * returns:	0/1 accordingly
   */
  static int dev_valid(int handle)
  {

  	if (handle < 0 || handle >= UB_MAX_DEV)

  		return 0;
  
  	if (devices[handle].state != DEV_STA_OPEN)
  		return 0;
  
  	return 1;
  }
  
  static int dev_stor_valid(int handle)
  {
  	if (!dev_valid(handle))
  		return 0;
  
  	if (!(devices[handle].type & DEV_TYP_STOR))
  		return 0;
  
  	return 1;
  }

  int ub_dev_read(int handle, void *buf, lbasize_t len, lbastart_t start,
  		lbasize_t *rlen)

  {
  	struct device_info *di;
  	lbasize_t act_len;
  	int err = 0;
  
  	if (!dev_stor_valid(handle))
  		return API_ENODEV;
  
  	di = &devices[handle];
  	if (!syscall(API_DEV_READ, &err, di, buf, &len, &start, &act_len))

  		return API_ESYSC;

  	if (!err && rlen)
  		*rlen = act_len;

  	return err;

  }
  
  static int dev_net_valid(int handle)
  {
  	if (!dev_valid(handle))
  		return 0;
  
  	if (devices[handle].type != DEV_TYP_NET)
  		return 0;
  
  	return 1;
  }

  int ub_dev_recv(int handle, void *buf, int len, int *rlen)

  {
  	struct device_info *di;
  	int err = 0, act_len;
  
  	if (!dev_net_valid(handle))
  		return API_ENODEV;
  
  	di = &devices[handle];
  	if (!syscall(API_DEV_READ, &err, di, buf, &len, &act_len))

  		return API_ESYSC;

  	if (!err && rlen)
  		*rlen = act_len;

  	 return (err);

  }
  
  int ub_dev_send(int handle, void *buf, int len)
  {
  	struct device_info *di;
  	int err = 0;
  
  	if (!dev_net_valid(handle))
  		return API_ENODEV;
  
  	di = &devices[handle];
  	if (!syscall(API_DEV_WRITE, &err, di, buf, &len))

  		return API_ESYSC;

  
  	return err;
  }
  
  /****************************************
   *
   * env vars
   *
   ****************************************/
  
  char * ub_env_get(const char *name)
  {
  	char *value;

  	if (!syscall(API_ENV_GET, NULL, name, &value))

  		return NULL;
  
  	return value;
  }
  
  void ub_env_set(const char *name, char *value)
  {

  	syscall(API_ENV_SET, NULL, name, value);

  }

  static char env_name[256];
  
  const char * ub_env_enum(const char *last)
  {
  	const char *env, *str;
  	int i;
  
  	env = NULL;
  
  	/*
  	 * It's OK to pass only the name piece as last (and not the whole
  	 * 'name=val' string), since the API_ENUM_ENV call uses envmatch()
  	 * internally, which handles such case
  	 */

  	if (!syscall(API_ENV_ENUM, NULL, last, &env))

  		return NULL;
  
  	if (!env)
  		/* no more env. variables to enumerate */
  		return NULL;
  
  	/* next enumerated env var */
  	memset(env_name, 0, 256);
  	for (i = 0, str = env; *str != '=' && *str != '\0';)
  		env_name[i++] = *str++;
  
  	env_name[i] = '\0';
  
  	return env_name;
  }

  
  /****************************************
   *
   * display
   *
   ****************************************/
  
  int ub_display_get_info(int type, struct display_info *di)
  {
  	int err = 0;

  	if (!syscall(API_DISPLAY_GET_INFO, &err, type, di))

  		return API_ESYSC;
  
  	return err;
  }
  
  int ub_display_draw_bitmap(ulong bitmap, int x, int y)
  {
  	int err = 0;
  
  	if (!syscall(API_DISPLAY_DRAW_BITMAP, &err, bitmap, x, y))
  		return API_ESYSC;
  
  	return err;
  }
  
  void ub_display_clear(void)
  {
  	syscall(API_DISPLAY_CLEAR, NULL);
  }

  
  __weak void *memcpy(void *dest, const void *src, size_t size)
  {
  	unsigned char *dptr = dest;
  	const unsigned char *ptr = src;
  	const unsigned char *end = src + size;
  
  	while (ptr < end)
  		*dptr++ = *ptr++;
  
  	return dest;
  }