/*-
 * Copyright (c) 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>

#include <zlib.h>
#include <stand.h>
#include "api_public.h"
#include "glue.h"

#ifdef DEBUG
#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt,##args); } while (0)
#else
#define debugf(fmt, args...)
#endif

/* Some random address used by U-Boot. */
extern long uboot_address;

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 = crc32(0, Z_NULL, 0);

        checksum = crc32(s.checksum, (void *)&s, sizeof(struct api_signature));

        if (checksum != sig->checksum)
                return (0);

        return (1);
}

/*
 * Checks to see if API signature's address was given to us as a command line
 * argument by U-Boot.
 *
 * returns 1/0 depending on found/not found result
 */
int
api_parse_cmdline_sig(int argc, char **argv, struct api_signature **sig)
{
        unsigned long api_address;
        int c;

        api_address = 0;
        opterr = 0;
        optreset = 1;
        optind = 1;

        while ((c = getopt (argc, argv, "a:")) != -1)
                switch (c) {
                case 'a':
                        api_address = strtoul(optarg, NULL, 16);
                        break;
                default:
                        break;
                }

        if (api_address != 0) {
                *sig = (struct api_signature *)api_address;
                if (valid_sig(*sig))
                        return (1);
        }

        return (0);
}

/*
 * 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, *spend;

        if (sig == NULL)
                return (0);

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

        sp = (void *)(uboot_address & API_SIG_SEARCH_MASK);
        spend = sp + API_SIG_SEARCH_LEN - API_SIG_MAGLEN;

        while (sp < spend) {
                if (!bcmp(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(const 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);
        while (1);      /* fallback if API_RESET failed */
        __unreachable();
}

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 = 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);
}

char *
ub_stor_type(int type)
{

        if (type & DT_STOR_IDE)
                return ("IDE");

        if (type & DT_STOR_SCSI)
                return ("SCSI");

        if (type & DT_STOR_USB)
                return ("USB");

        if (type & DT_STOR_MMC)
                return ("MMC");

        if (type & DT_STOR_SATA)
                return ("SATA");

        return ("Unknown");
}

char *
ub_mem_type(int flags)
{

        switch (flags & 0x000F) {
        case MR_ATTR_FLASH:
                return ("FLASH");
        case MR_ATTR_DRAM:
                return ("DRAM");
        case MR_ATTR_SRAM:
                return ("SRAM");
        default:
                return ("Unknown");
        }
}

void
ub_dump_di(int handle)
{
        struct device_info *di = ub_dev_get(handle);
        int i;

        printf("device info (%d):\n", handle);
        printf("  cookie\t= %p\n", di->cookie);
        printf("  type\t\t= 0x%08x\n", di->type);

        if (di->type == DEV_TYP_NET) {
                printf("  hwaddr\t= ");
                for (i = 0; i < 6; i++)
                        printf("%02x ", di->di_net.hwaddr[i]);

                printf("\n");

        } else if (di->type & DEV_TYP_STOR) {
                printf("  type\t\t= %s\n", ub_stor_type(di->type));
                printf("  blk size\t\t= %ld\n", di->di_stor.block_size);
                printf("  blk count\t\t= %ld\n", di->di_stor.block_count);
        }
}

void
ub_dump_si(struct sys_info *si)
{
        int i;

        printf("sys info:\n");
        printf("  clkbus\t= %ld MHz\n", si->clk_bus / 1000 / 1000);
        printf("  clkcpu\t= %ld MHz\n", si->clk_cpu / 1000 / 1000);
        printf("  bar\t\t= 0x%08lx\n", si->bar);

        printf("---\n");
        for (i = 0; i < si->mr_no; i++) {
                if (si->mr[i].flags == 0)
                        break;

                printf("  start\t= 0x%08lx\n", si->mr[i].start);
                printf("  size\t= 0x%08lx\n", si->mr[i].size);
                printf("  type\t= %s\n", ub_mem_type(si->mr[i].flags));
                printf("---\n");
        }
}

/****************************************
 *
 * 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;

        /*
         * 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
         */
        env = NULL;
        if (!syscall(API_ENV_ENUM, NULL, last, &env))
                return (NULL);

        if (env == NULL || last == 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);
}