// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2012-2015 Panasonic Corporation
 * Copyright (C) 2015-2016 Socionext Inc.
 *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
 */

#include <common.h>
#include <linux/ctype.h>
#include <linux/io.h>

#include "micro-support-card.h"

#define MICRO_SUPPORT_CARD_BASE         0x43f00000
#define SMC911X_BASE                    ((MICRO_SUPPORT_CARD_BASE) + 0x00000)
#define LED_BASE                        ((MICRO_SUPPORT_CARD_BASE) + 0x90000)
#define NS16550A_BASE                   ((MICRO_SUPPORT_CARD_BASE) + 0xb0000)
#define MICRO_SUPPORT_CARD_RESET        ((MICRO_SUPPORT_CARD_BASE) + 0xd0034)
#define MICRO_SUPPORT_CARD_REVISION     ((MICRO_SUPPORT_CARD_BASE) + 0xd00E0)

static bool support_card_found;

static void support_card_detect(void)
{
        DECLARE_GLOBAL_DATA_PTR;
        const void *fdt = gd->fdt_blob;
        int offset;

        offset = fdt_node_offset_by_compatible(fdt, 0, "smsc,lan9118");
        if (offset < 0)
                return;

        offset = fdt_node_offset_by_compatible(fdt, 0, "ns16550a");
        if (offset < 0)
                return;

        support_card_found = true;
}

/*
 * 0: reset deassert, 1: reset
 *
 * bit[0]: LAN, I2C, LED
 * bit[1]: UART
 */
static void support_card_reset_deassert(void)
{
        writel(0x00010000, MICRO_SUPPORT_CARD_RESET);
}

static void support_card_reset(void)
{
        writel(0x00020003, MICRO_SUPPORT_CARD_RESET);
}

static int support_card_show_revision(void)
{
        u32 revision;

        revision = readl(MICRO_SUPPORT_CARD_REVISION);
        revision &= 0xff;

        /* revision 3.6.x card changed the revision format */
        printf("SC:    Micro Support Card (CPLD version %s%d.%d)\n",
               revision >> 4 == 6 ? "3." : "",
               revision >> 4, revision & 0xf);

        return 0;
}

void support_card_init(void)
{
        support_card_detect();

        if (!support_card_found)
                return;

        support_card_reset();
        /*
         * After power on, we need to keep the LAN controller in reset state
         * for a while. (200 usec)
         */
        udelay(200);
        support_card_reset_deassert();

        support_card_show_revision();
}

#if defined(CONFIG_SMC911X)
#include <netdev.h>

int board_eth_init(bd_t *bis)
{
        if (!support_card_found)
                return 0;

        return smc911x_initialize(0, SMC911X_BASE);
}
#endif

#if defined(CONFIG_MTD_NOR_FLASH)

#include <mtd/cfi_flash.h>

struct memory_bank {
        phys_addr_t base;
        unsigned long size;
};

static int mem_is_flash(const struct memory_bank *mem)
{
        const int loop = 128;
        u32 *scratch_addr;
        u32 saved_value;
        int ret = 1;
        int i;

        /* just in case, use the tail of the memory bank */
        scratch_addr = map_physmem(mem->base + mem->size - sizeof(u32) * loop,
                                   sizeof(u32) * loop, MAP_NOCACHE);

        for (i = 0; i < loop; i++, scratch_addr++) {
                saved_value = readl(scratch_addr);
                writel(~saved_value, scratch_addr);
                if (readl(scratch_addr) != saved_value) {
                        /* We assume no memory or SRAM here. */
                        writel(saved_value, scratch_addr);
                        ret = 0;
                        break;
                }
        }

        unmap_physmem(scratch_addr, MAP_NOCACHE);

        return ret;
}

/* {address, size} */
static const struct memory_bank memory_banks[] = {
        {0x42000000, 0x01f00000},
};

static const struct memory_bank
*flash_banks_list[CONFIG_SYS_MAX_FLASH_BANKS_DETECT];

phys_addr_t cfi_flash_bank_addr(int i)
{
        return flash_banks_list[i]->base;
}

unsigned long cfi_flash_bank_size(int i)
{
        return flash_banks_list[i]->size;
}

static void detect_num_flash_banks(void)
{
        const struct memory_bank *memory_bank, *end;

        cfi_flash_num_flash_banks = 0;

        memory_bank = memory_banks;
        end = memory_bank + ARRAY_SIZE(memory_banks);

        for (; memory_bank < end; memory_bank++) {
                if (cfi_flash_num_flash_banks >=
                    CONFIG_SYS_MAX_FLASH_BANKS_DETECT)
                        break;

                if (mem_is_flash(memory_bank)) {
                        flash_banks_list[cfi_flash_num_flash_banks] =
                                                                memory_bank;

                        debug("flash bank found: base = 0x%lx, size = 0x%lx\n",
                              (unsigned long)memory_bank->base,
                              (unsigned long)memory_bank->size);
                        cfi_flash_num_flash_banks++;
                }
        }

        debug("number of flash banks: %d\n", cfi_flash_num_flash_banks);
}
#else /* CONFIG_MTD_NOR_FLASH */
static void detect_num_flash_banks(void)
{
};
#endif /* CONFIG_MTD_NOR_FLASH */

void support_card_late_init(void)
{
        if (!support_card_found)
                return;

        detect_num_flash_banks();
}

static const u8 ledval_num[] = {
        0x7e, /* 0 */
        0x0c, /* 1 */
        0xb6, /* 2 */
        0x9e, /* 3 */
        0xcc, /* 4 */
        0xda, /* 5 */
        0xfa, /* 6 */
        0x4e, /* 7 */
        0xfe, /* 8 */
        0xde, /* 9 */
};

static const u8 ledval_alpha[] = {
        0xee, /* A */
        0xf8, /* B */
        0x72, /* C */
        0xbc, /* D */
        0xf2, /* E */
        0xe2, /* F */
        0x7a, /* G */
        0xe8, /* H */
        0x08, /* I */
        0x3c, /* J */
        0xea, /* K */
        0x70, /* L */
        0x6e, /* M */
        0xa8, /* N */
        0xb8, /* O */
        0xe6, /* P */
        0xce, /* Q */
        0xa0, /* R */
        0xc8, /* S */
        0x8c, /* T */
        0x7c, /* U */
        0x54, /* V */
        0xfc, /* W */
        0xec, /* X */
        0xdc, /* Y */
        0xa4, /* Z */
};

static u8 char2ledval(char c)
{
        if (isdigit(c))
                return ledval_num[c - '0'];
        else if (isalpha(c))
                return ledval_alpha[toupper(c) - 'A'];

        return 0;
}

void led_puts(const char *s)
{
        int i;
        u32 val = 0;

        if (!support_card_found)
                return;

        if (!s)
                return;

        for (i = 0; i < 4; i++) {
                val <<= 8;
                val |= char2ledval(*s);
                if (*s != '\0')
                        s++;
        }

        writel(~val, LED_BASE);
}