/*
 * Copyright 2004, 2007-2010 Freescale Semiconductor, Inc.
 *
 * (C) Copyright 2003 Motorola Inc.
 * Xianghua Xiao, (X.Xiao@motorola.com)
 *
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <ppc_asm.tmpl>
#include <asm/processor.h>
#include <asm/io.h>

DECLARE_GLOBAL_DATA_PTR;

/* --------------------------------------------------------------- */

void get_sys_info (sys_info_t * sysInfo)
{
        volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
#ifdef CONFIG_FSL_CORENET
        volatile ccsr_clk_t *clk = (void *)(CONFIG_SYS_FSL_CORENET_CLK_ADDR);

        const u8 core_cplx_PLL[16] = {
                [ 0] = 0,       /* CC1 PPL / 1 */
                [ 1] = 0,       /* CC1 PPL / 2 */
                [ 2] = 0,       /* CC1 PPL / 4 */
                [ 4] = 1,       /* CC2 PPL / 1 */
                [ 5] = 1,       /* CC2 PPL / 2 */
                [ 6] = 1,       /* CC2 PPL / 4 */
                [ 8] = 2,       /* CC3 PPL / 1 */
                [ 9] = 2,       /* CC3 PPL / 2 */
                [10] = 2,       /* CC3 PPL / 4 */
                [12] = 3,       /* CC4 PPL / 1 */
                [13] = 3,       /* CC4 PPL / 2 */
                [14] = 3,       /* CC4 PPL / 4 */
        };

        const u8 core_cplx_PLL_div[16] = {
                [ 0] = 1,       /* CC1 PPL / 1 */
                [ 1] = 2,       /* CC1 PPL / 2 */
                [ 2] = 4,       /* CC1 PPL / 4 */
                [ 4] = 1,       /* CC2 PPL / 1 */
                [ 5] = 2,       /* CC2 PPL / 2 */
                [ 6] = 4,       /* CC2 PPL / 4 */
                [ 8] = 1,       /* CC3 PPL / 1 */
                [ 9] = 2,       /* CC3 PPL / 2 */
                [10] = 4,       /* CC3 PPL / 4 */
                [12] = 1,       /* CC4 PPL / 1 */
                [13] = 2,       /* CC4 PPL / 2 */
                [14] = 4,       /* CC4 PPL / 4 */
        };
        uint lcrr_div, i, freqCC_PLL[4], rcw_tmp;
        uint ratio[4];
        unsigned long sysclk = CONFIG_SYS_CLK_FREQ;
        uint mem_pll_rat;

        sysInfo->freqSystemBus = sysclk;
        sysInfo->freqDDRBus = sysclk;

        sysInfo->freqSystemBus *= (in_be32(&gur->rcwsr[0]) >> 25) & 0x1f;
        mem_pll_rat = (in_be32(&gur->rcwsr[0]) >> 17) & 0x1f;
        if (mem_pll_rat > 2)
                sysInfo->freqDDRBus *= mem_pll_rat;
        else
                sysInfo->freqDDRBus = sysInfo->freqSystemBus * mem_pll_rat;

        ratio[0] = (in_be32(&clk->pllc1gsr) >> 1) & 0x3f;
        ratio[1] = (in_be32(&clk->pllc2gsr) >> 1) & 0x3f;
        ratio[2] = (in_be32(&clk->pllc3gsr) >> 1) & 0x3f;
        ratio[3] = (in_be32(&clk->pllc4gsr) >> 1) & 0x3f;
        for (i = 0; i < 4; i++) {
                if (ratio[i] > 4)
                        freqCC_PLL[i] = sysclk * ratio[i];
                else
                        freqCC_PLL[i] = sysInfo->freqSystemBus * ratio[i];
        }
        rcw_tmp = in_be32(&gur->rcwsr[3]);
        for (i = 0; i < cpu_numcores(); i++) {
                u32 c_pll_sel = (in_be32(&clk->clkc0csr + i*8) >> 27) & 0xf;
                u32 cplx_pll = core_cplx_PLL[c_pll_sel];

                sysInfo->freqProcessor[i] =
                         freqCC_PLL[cplx_pll] / core_cplx_PLL_div[c_pll_sel];
        }

#define PME_CLK_SEL     0x80000000
#define FM1_CLK_SEL     0x40000000
#define FM2_CLK_SEL     0x20000000
        rcw_tmp = in_be32(&gur->rcwsr[7]);

#ifdef CONFIG_SYS_DPAA_PME
        if (rcw_tmp & PME_CLK_SEL)
                sysInfo->freqPME = freqCC_PLL[2] / 2;
        else
                sysInfo->freqPME = sysInfo->freqSystemBus / 2;
#endif

#ifdef CONFIG_SYS_DPAA_FMAN
        if (rcw_tmp & FM1_CLK_SEL)
                sysInfo->freqFMan[0] = freqCC_PLL[2] / 2;
        else
                sysInfo->freqFMan[0] = sysInfo->freqSystemBus / 2;
#if (CONFIG_SYS_NUM_FMAN) == 2
        if (rcw_tmp & FM2_CLK_SEL)
                sysInfo->freqFMan[1] = freqCC_PLL[2] / 2;
        else
                sysInfo->freqFMan[1] = sysInfo->freqSystemBus / 2;
#endif
#endif

#else
        uint plat_ratio,e500_ratio,half_freqSystemBus;
        uint lcrr_div;
        int i;
#ifdef CONFIG_QE
        u32 qe_ratio;
#endif

        plat_ratio = (gur->porpllsr) & 0x0000003e;
        plat_ratio >>= 1;
        sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;

        /* Divide before multiply to avoid integer
         * overflow for processor speeds above 2GHz */
        half_freqSystemBus = sysInfo->freqSystemBus/2;
        for (i = 0; i < cpu_numcores(); i++) {
                e500_ratio = ((gur->porpllsr) >> (i * 8 + 16)) & 0x3f;
                sysInfo->freqProcessor[i] = e500_ratio * half_freqSystemBus;
        }

        /* Note: freqDDRBus is the MCLK frequency, not the data rate. */
        sysInfo->freqDDRBus = sysInfo->freqSystemBus;

#ifdef CONFIG_DDR_CLK_FREQ
        {
                u32 ddr_ratio = ((gur->porpllsr) & MPC85xx_PORPLLSR_DDR_RATIO)
                        >> MPC85xx_PORPLLSR_DDR_RATIO_SHIFT;
                if (ddr_ratio != 0x7)
                        sysInfo->freqDDRBus = ddr_ratio * CONFIG_DDR_CLK_FREQ;
        }
#endif
#endif

#ifdef CONFIG_QE
        qe_ratio = ((gur->porpllsr) & MPC85xx_PORPLLSR_QE_RATIO)
                        >> MPC85xx_PORPLLSR_QE_RATIO_SHIFT;
        sysInfo->freqQE = qe_ratio * CONFIG_SYS_CLK_FREQ;
#endif

#if defined(CONFIG_SYS_LBC_LCRR)
        /* We will program LCRR to this value later */
        lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV;
#else
        {
            volatile ccsr_lbc_t *lbc = (void *)(CONFIG_SYS_MPC85xx_LBC_ADDR);
            lcrr_div = in_be32(&lbc->lcrr) & LCRR_CLKDIV;
        }
#endif
        if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
#if defined(CONFIG_FSL_CORENET)
                /* If this is corenet based SoC, bit-representation
                 * for four times the clock divider values.
                 */
                lcrr_div *= 4;
#elif !defined(CONFIG_MPC8540) && !defined(CONFIG_MPC8541) && \
    !defined(CONFIG_MPC8555) && !defined(CONFIG_MPC8560)
                /*
                 * Yes, the entire PQ38 family use the same
                 * bit-representation for twice the clock divider values.
                 */
                lcrr_div *= 2;
#endif
                sysInfo->freqLocalBus = sysInfo->freqSystemBus / lcrr_div;
        } else {
                /* In case anyone cares what the unknown value is */
                sysInfo->freqLocalBus = lcrr_div;
        }
}


int get_clocks (void)
{
        sys_info_t sys_info;
#ifdef CONFIG_MPC8544
        volatile ccsr_gur_t *gur = (void *) CONFIG_SYS_MPC85xx_GUTS_ADDR;
#endif
#if defined(CONFIG_CPM2)
        volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
        uint sccr, dfbrg;

        /* set VCO = 4 * BRG */
        cpm->im_cpm_intctl.sccr &= 0xfffffffc;
        sccr = cpm->im_cpm_intctl.sccr;
        dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT;
#endif
        get_sys_info (&sys_info);
        gd->cpu_clk = sys_info.freqProcessor[0];
        gd->bus_clk = sys_info.freqSystemBus;
        gd->mem_clk = sys_info.freqDDRBus;
        gd->lbc_clk = sys_info.freqLocalBus;

#ifdef CONFIG_QE
        gd->qe_clk = sys_info.freqQE;
        gd->brg_clk = gd->qe_clk / 2;
#endif
        /*
         * The base clock for I2C depends on the actual SOC.  Unfortunately,
         * there is no pattern that can be used to determine the frequency, so
         * the only choice is to look up the actual SOC number and use the value
         * for that SOC. This information is taken from application note
         * AN2919.
         */
#if defined(CONFIG_MPC8540) || defined(CONFIG_MPC8541) || \
        defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555)
        gd->i2c1_clk = sys_info.freqSystemBus;
#elif defined(CONFIG_MPC8544)
        /*
         * On the 8544, the I2C clock is the same as the SEC clock.  This can be
         * either CCB/2 or CCB/3, depending on the value of cfg_sec_freq. See
         * 4.4.3.3 of the 8544 RM.  Note that this might actually work for all
         * 85xx, but only the 8544 has cfg_sec_freq, so it's unknown if the
         * PORDEVSR2_SEC_CFG bit is 0 on all 85xx boards that are not an 8544.
         */
        if (gur->pordevsr2 & MPC85xx_PORDEVSR2_SEC_CFG)
                gd->i2c1_clk = sys_info.freqSystemBus / 3;
        else
                gd->i2c1_clk = sys_info.freqSystemBus / 2;
#else
        /* Most 85xx SOCs use CCB/2, so this is the default behavior. */
        gd->i2c1_clk = sys_info.freqSystemBus / 2;
#endif
        gd->i2c2_clk = gd->i2c1_clk;

#if defined(CONFIG_FSL_ESDHC)
#ifdef CONFIG_MPC8569
        gd->sdhc_clk = gd->bus_clk;
#else
        gd->sdhc_clk = gd->bus_clk / 2;
#endif
#endif /* defined(CONFIG_FSL_ESDHC) */

#if defined(CONFIG_CPM2)
        gd->vco_out = 2*sys_info.freqSystemBus;
        gd->cpm_clk = gd->vco_out / 2;
        gd->scc_clk = gd->vco_out / 4;
        gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1)));
#endif

        if(gd->cpu_clk != 0) return (0);
        else return (1);
}


/********************************************
 * get_bus_freq
 * return system bus freq in Hz
 *********************************************/
ulong get_bus_freq (ulong dummy)
{
        return gd->bus_clk;
}

/********************************************
 * get_ddr_freq
 * return ddr bus freq in Hz
 *********************************************/
ulong get_ddr_freq (ulong dummy)
{
        return gd->mem_clk;
}