/*
 * (C) Copyright 2006
 * Sylvie Gohl,             AMCC/IBM, gohl.sylvie@fr.ibm.com
 * Jacqueline Pira-Ferriol, AMCC/IBM, jpira-ferriol@fr.ibm.com
 * Thierry Roman,           AMCC/IBM, thierry_roman@fr.ibm.com
 * Alain Saurel,            AMCC/IBM, alain.saurel@fr.ibm.com
 * Robert Snyder,           AMCC/IBM, rob.snyder@fr.ibm.com
 *
 * (C) Copyright 2007-2013
 * Stefan Roese, DENX Software Engineering, sr@denx.de.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

/* define DEBUG for debugging output (obviously ;-)) */
#if 0
#define DEBUG
#endif

#include <common.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/io.h>
#include <asm/cache.h>
#include <asm/ppc440.h>
#include <watchdog.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * This DDR2 setup code can dynamically setup the TLB entries for the DDR2 memory
 * region. Right now the cache should still be disabled in U-Boot because of the
 * EMAC driver, that need it's buffer descriptor to be located in non cached
 * memory.
 *
 * If at some time this restriction doesn't apply anymore, just define
 * CONFIG_4xx_DCACHE in the board config file and this code should setup
 * everything correctly.
 */
#ifdef CONFIG_4xx_DCACHE
#define MY_TLB_WORD2_I_ENABLE   0                       /* enable caching on SDRAM */
#else
#define MY_TLB_WORD2_I_ENABLE   TLB_WORD2_I_ENABLE      /* disable caching on SDRAM */
#endif

/*-----------------------------------------------------------------------------+
 * Prototypes
 *-----------------------------------------------------------------------------*/
extern int denali_wait_for_dlllock(void);
extern void denali_core_search_data_eye(void);
extern void dcbz_area(u32 start_address, u32 num_bytes);

static u32 is_ecc_enabled(void)
{
        u32 val;

        mfsdram(DDR0_22, val);
        val &= DDR0_22_CTRL_RAW_MASK;
        if (val)
                return 1;
        else
                return 0;
}

void board_add_ram_info(int use_default)
{
        PPC4xx_SYS_INFO board_cfg;
        u32 val;

        if (is_ecc_enabled())
                puts(" (ECC");
        else
                puts(" (ECC not");

        get_sys_info(&board_cfg);
        printf(" enabled, %ld MHz", (board_cfg.freqPLB * 2) / 1000000);

        mfsdram(DDR0_03, val);
        val = DDR0_03_CASLAT_DECODE(val);
        printf(", CL%d)", val);
}

#ifdef CONFIG_DDR_ECC
static void wait_ddr_idle(void)
{
        /*
         * Controller idle status cannot be determined for Denali
         * DDR2 code. Just return here.
         */
}

static void program_ecc(u32 start_address,
                        u32 num_bytes,
                        u32 tlb_word2_i_value)
{
        u32 val;
        u32 current_addr = start_address;
        u32 size;
        int bytes_remaining;

        sync();
        wait_ddr_idle();

        /*
         * Because of 440EPx errata CHIP 11, we don't touch the last 256
         * bytes of SDRAM.
         */
        bytes_remaining = num_bytes - CONFIG_SYS_MEM_TOP_HIDE;

        /*
         * We have to write the ECC bytes by zeroing and flushing in smaller
         * steps, since the whole 256MByte takes too long for the external
         * watchdog.
         */
        while (bytes_remaining > 0) {
                size = min((64 << 20), bytes_remaining);

                /* Write zero's to SDRAM */
                dcbz_area(current_addr, size);

                /* Write modified dcache lines back to memory */
                clean_dcache_range(current_addr, current_addr + size);

                current_addr += 64 << 20;
                bytes_remaining -= 64 << 20;
                WATCHDOG_RESET();
        }

        sync();
        wait_ddr_idle();

        /* Clear error status */
        mfsdram(DDR0_00, val);
        mtsdram(DDR0_00, val | DDR0_00_INT_ACK_ALL);

        /* Set 'int_mask' parameter to functionnal value */
        mfsdram(DDR0_01, val);
        mtsdram(DDR0_01, ((val &~ DDR0_01_INT_MASK_MASK) | DDR0_01_INT_MASK_ALL_OFF));

        sync();
        wait_ddr_idle();
}
#endif

/*************************************************************************
 *
 * dram_init -- 440EPx's DDR controller is a DENALI Core
 *
 ************************************************************************/
int dram_init(void)
{
        /* CL=4 */
        mtsdram(DDR0_02, 0x00000000);

        mtsdram(DDR0_00, 0x0000190A);
        mtsdram(DDR0_01, 0x01000000);
        mtsdram(DDR0_03, 0x02040803); /* A suitable burst length was taken. CAS is right for our board */

        mtsdram(DDR0_04, 0x0B030300);
        mtsdram(DDR0_05, 0x02020308);
        mtsdram(DDR0_06, 0x0003C812);
        mtsdram(DDR0_07, 0x00090100);
        mtsdram(DDR0_08, 0x03c80001);
        mtsdram(DDR0_09, 0x00011D5F);
        mtsdram(DDR0_10, 0x00000100);
        mtsdram(DDR0_11, 0x000CC800);
        mtsdram(DDR0_12, 0x00000003);
        mtsdram(DDR0_14, 0x00000000);
        mtsdram(DDR0_17, 0x1e000000);
        mtsdram(DDR0_18, 0x1e1e1e1e);
        mtsdram(DDR0_19, 0x1e1e1e1e);
        mtsdram(DDR0_20, 0x0B0B0B0B);
        mtsdram(DDR0_21, 0x0B0B0B0B);
#ifdef CONFIG_DDR_ECC
        mtsdram(DDR0_22, 0x00267F0B | DDR0_22_CTRL_RAW_ECC_ENABLE); /* enable ECC       */
#else
        mtsdram(DDR0_22, 0x00267F0B);
#endif

        mtsdram(DDR0_23, 0x01000000);
        mtsdram(DDR0_24, 0x01010001);

        mtsdram(DDR0_26, 0x2D93028A);
        mtsdram(DDR0_27, 0x0784682B);

        mtsdram(DDR0_28, 0x00000080);
        mtsdram(DDR0_31, 0x00000000);
        mtsdram(DDR0_42, 0x01000008);

        mtsdram(DDR0_43, 0x050A0200);
        mtsdram(DDR0_44, 0x00000005);
        mtsdram(DDR0_02, 0x00000001); /* Activate the denali core */

        denali_wait_for_dlllock();

#if defined(CONFIG_DDR_DATA_EYE)
        /* -----------------------------------------------------------+
         * Perform data eye search if requested.
         * ----------------------------------------------------------*/
        program_tlb(0, CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20,
                    TLB_WORD2_I_ENABLE);
        denali_core_search_data_eye();
        remove_tlb(CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20);
#endif

        /*
         * Program tlb entries for this size (dynamic)
         */
        program_tlb(0, CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20,
                    MY_TLB_WORD2_I_ENABLE);

#if defined(CONFIG_DDR_ECC)
#if defined(CONFIG_4xx_DCACHE)
        /*
         * If ECC is enabled, initialize the parity bits.
         */
        program_ecc(0, CONFIG_SYS_MBYTES_SDRAM << 20, 0);
#else /* CONFIG_4xx_DCACHE */
        /*
         * Setup 2nd TLB with same physical address but different virtual address
         * with cache enabled. This is done for fast ECC generation.
         */
        program_tlb(0, CONFIG_SYS_DDR_CACHED_ADDR, CONFIG_SYS_MBYTES_SDRAM << 20, 0);

        /*
         * If ECC is enabled, initialize the parity bits.
         */
        program_ecc(CONFIG_SYS_DDR_CACHED_ADDR, CONFIG_SYS_MBYTES_SDRAM << 20, 0);

        /*
         * Now after initialization (auto-calibration and ECC generation)
         * remove the TLB entries with caches enabled and program again with
         * desired cache functionality
         */
        remove_tlb(CONFIG_SYS_DDR_CACHED_ADDR, CONFIG_SYS_MBYTES_SDRAM << 20);
#endif /* CONFIG_4xx_DCACHE */
#endif /* CONFIG_DDR_ECC */

        /*
         * Clear possible errors resulting from data-eye-search.
         * If not done, then we could get an interrupt later on when
         * exceptions are enabled.
         */
        set_mcsr(get_mcsr());

        gd->ram_size = CONFIG_SYS_MBYTES_SDRAM << 20;

        return 0;
}