/* SPDX-License-Identifier: GPL-2.0-only */

#include <assert.h>
#include <cbfs.h>
#include <cbmem.h>
#include <commonlib/bsd/mem_chip_info.h>
#include <console/console.h>
#include <soc/dramc_common.h>
#include <ip_checksum.h>
#include <mrc_cache.h>
#include <soc/dramc_param.h>
#include <soc/emi.h>
#include <soc/mmu_operations.h>
#include <symbols.h>
#include <timer.h>

/* This must be defined in chromeos.fmd in same name and size. */
#define CALIBRATION_REGION		"RW_MRC_CACHE"
#define CALIBRATION_REGION_SIZE		0x2000

_Static_assert(sizeof(struct dramc_param) <= CALIBRATION_REGION_SIZE,
	       "sizeof(struct dramc_param) exceeds " CALIBRATION_REGION);

const char *get_dram_geometry_str(u32 ddr_geometry);
const char *get_dram_type_str(u32 ddr_type);

static const struct ddr_base_info *curr_ddr_info;

static int mt_mem_test(const struct dramc_data *dparam)
{
	if (CONFIG(MEMORY_TEST)) {
		u8 *addr = _dram;
		const struct ddr_base_info *ddr_info = &dparam->ddr_info;

		for (u8 rank = RANK_0; rank < ddr_info->support_ranks; rank++) {
			int result = complex_mem_test(addr, 0x2000);

			if (result != 0) {
				printk(BIOS_ERR,
				       "[MEM] complex R/W mem test failed: %d\n", result);
				return -1;
			}
			printk(BIOS_DEBUG, "[MEM] rank %u complex R/W mem test passed\n", rank);

			addr += ddr_info->rank_size[rank];
		}
	}

	return 0;
}

const char *get_dram_geometry_str(u32 ddr_geometry)
{
	const char *s;

	switch (ddr_geometry) {
	case DDR_TYPE_2CH_2RK_4GB_2_2:
		s = "2CH_2RK_4GB_2_2";
		break;
	case DDR_TYPE_2CH_2RK_6GB_3_3:
		s = "2CH_2RK_6GB_3_3";
		break;
	case DDR_TYPE_2CH_2RK_8GB_4_4:
		s = "2CH_2RK_8GB_4_4";
		break;
	case DDR_TYPE_2CH_2RK_8GB_4_4_BYTE:
		s = "2CH_2RK_8GB_4_4_BYTE";
		break;
	case DDR_TYPE_2CH_1RK_4GB_4_0:
		s = "2CH_1RK_4GB_4_0";
		break;
	case DDR_TYPE_2CH_2RK_6GB_2_4:
		s = "2CH_2RK_6GB_2_4";
		break;
	default:
		s = "";
		break;
	}

	return s;
}

const char *get_dram_type_str(u32 ddr_type)
{
	const char *s;

	switch (ddr_type) {
	case DDR_TYPE_DISCRETE:
		s = "DSC";
		break;
	case DDR_TYPE_EMCP:
		s = "EMCP";
		break;
	default:
		s = "";
		break;
	}

	return s;
}

size_t mtk_dram_size(void)
{
	size_t size = 0;

	if (!curr_ddr_info)
		return 0;
	for (unsigned int i = 0; i < RANK_MAX; ++i)
		size += curr_ddr_info->mrr_info.mr8_density[i];
	return size;
}

static void fill_dram_info(struct mem_chip_info *mc, const struct ddr_base_info *ddr)
{
	unsigned int i;
	size_t size;

	mc->type = MEM_CHIP_LPDDR4X;
	mc->num_channels = CHANNEL_MAX;
	size = mtk_dram_size();
	assert(size);

	for (i = 0; i < mc->num_channels; ++i) {
		mc->channel[i].density = size / mc->num_channels;
		mc->channel[i].io_width = DQ_DATA_WIDTH_LP4;
		mc->channel[i].manufacturer_id = ddr->mrr_info.mr5_vendor_id;
		mc->channel[i].revision_id[0] = ddr->mrr_info.mr6_revision_id;
		mc->channel[i].revision_id[1] = ddr->mrr_info.mr7_revision_id;
	}
}

static void add_mem_chip_info(int unused)
{
	struct mem_chip_info *mc;
	size_t size;

	if (!CONFIG(USE_CBMEM_DRAM_INFO)) {
		printk(BIOS_DEBUG,
		       "DRAM-K: CBMEM DRAM info is unsupported (USE_CBMEM_DRAM_INFO)\n");
		return;
	}

	size = sizeof(*mc) + sizeof(struct mem_chip_channel) * CHANNEL_MAX;
	mc = cbmem_add(CBMEM_ID_MEM_CHIP_INFO, size);
	assert(mc);

	fill_dram_info(mc, curr_ddr_info);
}
CBMEM_CREATION_HOOK(add_mem_chip_info);

static int run_dram_blob(struct dramc_param *dparam)
{
	/* Load and run the provided blob for full-calibration if available */
	struct prog dram = PROG_INIT(PROG_REFCODE, CONFIG_CBFS_PREFIX "/dram");

	dump_param_header(dparam);

	if (cbfs_prog_stage_load(&dram)) {
		printk(BIOS_ERR, "DRAM-K: CBFS load program failed\n");
		return -2;
	}

	dparam->do_putc = do_putchar;

	prog_set_entry(&dram, prog_entry(&dram), dparam);
	prog_run(&dram);
	if (dparam->header.status != DRAMC_SUCCESS) {
		printk(BIOS_ERR, "DRAM-K: calibration failed: status = %d\n",
		       dparam->header.status);
		return -3;
	}

	if (!(dparam->header.config & DRAMC_CONFIG_FAST_K)
	    && !(dparam->header.flags & DRAMC_FLAG_HAS_SAVED_DATA)) {
		printk(BIOS_ERR,
		       "DRAM-K: Full calibration executed without saving parameters. "
		       "Please ensure the blob is built properly.\n");
		return -4;
	}

	return 0;
}

static int dram_run_fast_calibration(struct dramc_param *dparam)
{
	const u16 config = CONFIG(MEDIATEK_DRAM_DVFS) ? DRAMC_ENABLE_DVFS : DRAMC_DISABLE_DVFS;

	if (dparam->dramc_datas.ddr_info.config_dvfs != config) {
		printk(BIOS_WARNING,
		       "DRAM-K: Incompatible config for calibration data from flash "
		       "(expected: %#x, saved: %#x)\n",
		       config, dparam->dramc_datas.ddr_info.config_dvfs);
		return -1;
	}

	printk(BIOS_INFO, "DRAM-K: DRAM calibration data valid pass\n");

	if (CONFIG(MEDIATEK_BLOB_FAST_INIT)) {
		printk(BIOS_INFO, "DRAM-K: Run fast calibration run in blob mode\n");

		/*
		 * The loaded config should not contain FAST_K (done in full calibration),
		 * so we have to set that now to indicate the blob taking the config instead
		 * of generating a new config.
		 */
		dparam->header.config |= DRAMC_CONFIG_FAST_K;

		if (run_dram_blob(dparam) < 0)
			return -3;
	} else {
		init_dram_by_params(dparam);
	}

	if (mt_mem_test(&dparam->dramc_datas) < 0)
		return -4;

	return 0;
}

static int dram_run_full_calibration(struct dramc_param *dparam)
{
	initialize_dramc_param(dparam);

	return run_dram_blob(dparam);
}

static void mem_init_set_default_config(struct dramc_param *dparam,
					const struct sdram_info *dram_info)
{
	u32 type, geometry;
	memset(dparam, 0, sizeof(*dparam));

	type = dram_info->ddr_type;
	geometry = dram_info->ddr_geometry;

	dparam->dramc_datas.ddr_info.sdram.ddr_type = type;

	if (CONFIG(MEDIATEK_DRAM_DVFS))
		dparam->dramc_datas.ddr_info.config_dvfs = DRAMC_ENABLE_DVFS;

	dparam->dramc_datas.ddr_info.sdram.ddr_geometry = geometry;

	printk(BIOS_INFO, "DRAM-K: ddr_type: %s, config_dvfs: %d, ddr_geometry: %s\n",
	       get_dram_type_str(type),
	       dparam->dramc_datas.ddr_info.config_dvfs,
	       get_dram_geometry_str(geometry));
}

static void mt_mem_init_run(struct dramc_param *dparam,
			    const struct sdram_info *dram_info)
{
	const ssize_t mrc_cache_size = sizeof(*dparam);
	ssize_t data_size;
	struct stopwatch sw;
	int ret;

	/* Load calibration params from flash and run fast calibration */
	data_size = mrc_cache_load_current(MRC_TRAINING_DATA,
					   DRAMC_PARAM_HEADER_VERSION,
					   dparam, mrc_cache_size);
	if (data_size == mrc_cache_size) {
		printk(BIOS_INFO, "DRAM-K: Running fast calibration\n");
		stopwatch_init(&sw);

		ret = dram_run_fast_calibration(dparam);
		if (ret != 0) {
			printk(BIOS_ERR, "DRAM-K: Failed to run fast calibration "
			       "in %ld msecs, error: %d\n",
			       stopwatch_duration_msecs(&sw), ret);

			/* Erase flash data after fast calibration failed */
			memset(dparam, 0xa5, mrc_cache_size);
			mrc_cache_stash_data(MRC_TRAINING_DATA,
					     DRAMC_PARAM_HEADER_VERSION,
					     dparam, mrc_cache_size);
		} else {
			printk(BIOS_INFO, "DRAM-K: Fast calibration passed in %ld msecs\n",
			       stopwatch_duration_msecs(&sw));
			return;
		}
	} else {
		printk(BIOS_WARNING, "DRAM-K: Invalid data in flash (size: %#zx, expected: %#zx)\n",
		       data_size, mrc_cache_size);
	}

	/* Run full calibration */
	printk(BIOS_INFO, "DRAM-K: Running full calibration\n");
	mem_init_set_default_config(dparam, dram_info);

	stopwatch_init(&sw);
	int err = dram_run_full_calibration(dparam);
	if (err == 0) {
		printk(BIOS_INFO, "DRAM-K: Full calibration passed in %ld msecs\n",
		       stopwatch_duration_msecs(&sw));
		mrc_cache_stash_data(MRC_TRAINING_DATA,
				     DRAMC_PARAM_HEADER_VERSION,
				     dparam, mrc_cache_size);
	} else {
		printk(BIOS_ERR, "DRAM-K: Full calibration failed in %ld msecs\n",
		       stopwatch_duration_msecs(&sw));
	}
}

void mt_mem_init(struct dramc_param *dparam)
{
	const struct sdram_info *sdram_param = get_sdram_config();

	mt_mem_init_run(dparam, sdram_param);
}

void mtk_dram_init(void)
{
	/* dramc_param is too large to fit in stack. */
	static struct dramc_param dramc_parameter;
	mt_mem_init(&dramc_parameter);
	curr_ddr_info = &dramc_parameter.dramc_datas.ddr_info;
	mtk_mmu_after_dram();
}