/*
 * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0+
 */

#include <common.h>
#include <malloc.h>
#include <errno.h>
#include <div64.h>
#include <dfu.h>
#include <spi.h>
#include <spi_flash.h>

static long dfu_get_medium_size_sf(struct dfu_entity *dfu)
{
	return dfu->data.sf.size;
}

static int dfu_read_medium_sf(struct dfu_entity *dfu, u64 offset, void *buf,
		long *len)
{
	return spi_flash_read(dfu->data.sf.dev, dfu->data.sf.start + offset,
		*len, buf);
}

static u64 find_sector(struct dfu_entity *dfu, u64 start, u64 offset)
{
	return (lldiv((start + offset), dfu->data.sf.dev->sector_size)) *
		dfu->data.sf.dev->sector_size;
}

static int dfu_write_medium_sf(struct dfu_entity *dfu,
		u64 offset, void *buf, long *len)
{
	int ret;

	ret = spi_flash_erase(dfu->data.sf.dev,
			      find_sector(dfu, dfu->data.sf.start, offset),
			      dfu->data.sf.dev->sector_size);
	if (ret)
		return ret;

	ret = spi_flash_write(dfu->data.sf.dev, dfu->data.sf.start + offset,
			      *len, buf);
	if (ret)
		return ret;

	return 0;
}

static int dfu_flush_medium_sf(struct dfu_entity *dfu)
{
	return 0;
}

static unsigned int dfu_polltimeout_sf(struct dfu_entity *dfu)
{
	return DFU_DEFAULT_POLL_TIMEOUT;
}

static void dfu_free_entity_sf(struct dfu_entity *dfu)
{
	spi_flash_free(dfu->data.sf.dev);
}

static struct spi_flash *parse_dev(char *devstr)
{
	unsigned int bus;
	unsigned int cs;
	unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
	unsigned int mode = CONFIG_SF_DEFAULT_MODE;
	char *s, *endp;
	struct spi_flash *dev;

	s = strsep(&devstr, ":");
	if (!s || !*s || (bus = simple_strtoul(s, &endp, 0), *endp)) {
		printf("Invalid SPI bus %s\n", s);
		return NULL;
	}

	s = strsep(&devstr, ":");
	if (!s || !*s || (cs = simple_strtoul(s, &endp, 0), *endp)) {
		printf("Invalid SPI chip-select %s\n", s);
		return NULL;
	}

	s = strsep(&devstr, ":");
	if (s && *s) {
		speed = simple_strtoul(s, &endp, 0);
		if (*endp || !speed) {
			printf("Invalid SPI speed %s\n", s);
			return NULL;
		}
	}

	s = strsep(&devstr, ":");
	if (s && *s) {
		mode = simple_strtoul(s, &endp, 0);
		if (*endp || mode > 3) {
			printf("Invalid SPI mode %s\n", s);
			return NULL;
		}
	}

	dev = spi_flash_probe(bus, cs, speed, mode);
	if (!dev) {
		printf("Failed to create SPI flash at %d:%d:%d:%d\n",
		       bus, cs, speed, mode);
		return NULL;
	}

	return dev;
}

int dfu_fill_entity_sf(struct dfu_entity *dfu, char *devstr, char *s)
{
	char *st;
	char *devstr_bkup = strdup(devstr);

	dfu->data.sf.dev = parse_dev(devstr_bkup);
	free(devstr_bkup);
	if (!dfu->data.sf.dev)
		return -ENODEV;

	dfu->dev_type = DFU_DEV_SF;
	dfu->max_buf_size = dfu->data.sf.dev->sector_size;

	st = strsep(&s, " ");
	if (!strcmp(st, "raw")) {
		dfu->layout = DFU_RAW_ADDR;
		dfu->data.sf.start = simple_strtoul(s, &s, 16);
		s++;
		dfu->data.sf.size = simple_strtoul(s, &s, 16);
	} else {
		printf("%s: Memory layout (%s) not supported!\n", __func__, st);
		spi_flash_free(dfu->data.sf.dev);
		return -1;
	}

	dfu->get_medium_size = dfu_get_medium_size_sf;
	dfu->read_medium = dfu_read_medium_sf;
	dfu->write_medium = dfu_write_medium_sf;
	dfu->flush_medium = dfu_flush_medium_sf;
	dfu->poll_timeout = dfu_polltimeout_sf;
	dfu->free_entity = dfu_free_entity_sf;

	/* initial state */
	dfu->inited = 0;

	return 0;
}