/*
 *
 * Clock initialization for OMAP4
 *
 * (C) Copyright 2010
 * Texas Instruments, <www.ti.com>
 *
 * Aneesh V <aneesh@ti.com>
 *
 * Based on previous work by:
 *      Santosh Shilimkar <santosh.shilimkar@ti.com>
 *      Rajendra Nayak <rnayak@ti.com>
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */
#include <common.h>
#include <i2c.h>
#include <asm/omap_common.h>
#include <asm/gpio.h>
#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>
#include <asm/utils.h>
#include <asm/omap_gpio.h>
#include <asm/emif.h>

#ifndef CONFIG_SPL_BUILD
/*
 * printing to console doesn't work unless
 * this code is executed from SPL
 */
#define printf(fmt, args...)
#define puts(s)
#endif

const u32 sys_clk_array[8] = {
        12000000,              /* 12 MHz */
        20000000,               /* 20 MHz */
        16800000,              /* 16.8 MHz */
        19200000,              /* 19.2 MHz */
        26000000,              /* 26 MHz */
        27000000,              /* 27 MHz */
        38400000,              /* 38.4 MHz */
};

static inline u32 __get_sys_clk_index(void)
{
        s8 ind;
        /*
         * For ES1 the ROM code calibration of sys clock is not reliable
         * due to hw issue. So, use hard-coded value. If this value is not
         * correct for any board over-ride this function in board file
         * From ES2.0 onwards you will get this information from
         * CM_SYS_CLKSEL
         */
        if (omap_revision() == OMAP4430_ES1_0)
                ind = OMAP_SYS_CLK_IND_38_4_MHZ;
        else {
                /* SYS_CLKSEL - 1 to match the dpll param array indices */
                ind = (readl((*prcm)->cm_sys_clksel) &
                        CM_SYS_CLKSEL_SYS_CLKSEL_MASK) - 1;
        }
        return ind;
}

u32 get_sys_clk_index(void)
        __attribute__ ((weak, alias("__get_sys_clk_index")));

u32 get_sys_clk_freq(void)
{
        u8 index = get_sys_clk_index();
        return sys_clk_array[index];
}

void setup_post_dividers(u32 const base, const struct dpll_params *params)
{
        struct dpll_regs *const dpll_regs = (struct dpll_regs *)base;

        /* Setup post-dividers */
        if (params->m2 >= 0)
                writel(params->m2, &dpll_regs->cm_div_m2_dpll);
        if (params->m3 >= 0)
                writel(params->m3, &dpll_regs->cm_div_m3_dpll);
        if (params->m4_h11 >= 0)
                writel(params->m4_h11, &dpll_regs->cm_div_m4_h11_dpll);
        if (params->m5_h12 >= 0)
                writel(params->m5_h12, &dpll_regs->cm_div_m5_h12_dpll);
        if (params->m6_h13 >= 0)
                writel(params->m6_h13, &dpll_regs->cm_div_m6_h13_dpll);
        if (params->m7_h14 >= 0)
                writel(params->m7_h14, &dpll_regs->cm_div_m7_h14_dpll);
        if (params->h21 >= 0)
                writel(params->h21, &dpll_regs->cm_div_h21_dpll);
        if (params->h22 >= 0)
                writel(params->h22, &dpll_regs->cm_div_h22_dpll);
        if (params->h23 >= 0)
                writel(params->h23, &dpll_regs->cm_div_h23_dpll);
        if (params->h24 >= 0)
                writel(params->h24, &dpll_regs->cm_div_h24_dpll);
}

static inline void do_bypass_dpll(u32 const base)
{
        struct dpll_regs *dpll_regs = (struct dpll_regs *)base;

        clrsetbits_le32(&dpll_regs->cm_clkmode_dpll,
                        CM_CLKMODE_DPLL_DPLL_EN_MASK,
                        DPLL_EN_FAST_RELOCK_BYPASS <<
                        CM_CLKMODE_DPLL_EN_SHIFT);
}

static inline void wait_for_bypass(u32 const base)
{
        struct dpll_regs *const dpll_regs = (struct dpll_regs *)base;

        if (!wait_on_value(ST_DPLL_CLK_MASK, 0, &dpll_regs->cm_idlest_dpll,
                                LDELAY)) {
                printf("Bypassing DPLL failed %x\n", base);
        }
}

static inline void do_lock_dpll(u32 const base)
{
        struct dpll_regs *const dpll_regs = (struct dpll_regs *)base;

        clrsetbits_le32(&dpll_regs->cm_clkmode_dpll,
                      CM_CLKMODE_DPLL_DPLL_EN_MASK,
                      DPLL_EN_LOCK << CM_CLKMODE_DPLL_EN_SHIFT);
}

static inline void wait_for_lock(u32 const base)
{
        struct dpll_regs *const dpll_regs = (struct dpll_regs *)base;

        if (!wait_on_value(ST_DPLL_CLK_MASK, ST_DPLL_CLK_MASK,
                &dpll_regs->cm_idlest_dpll, LDELAY)) {
                printf("DPLL locking failed for %x\n", base);
                hang();
        }
}

inline u32 check_for_lock(u32 const base)
{
        struct dpll_regs *const dpll_regs = (struct dpll_regs *)base;
        u32 lock = readl(&dpll_regs->cm_idlest_dpll) & ST_DPLL_CLK_MASK;

        return lock;
}

const struct dpll_params *get_mpu_dpll_params(struct dplls const *dpll_data)
{
        u32 sysclk_ind = get_sys_clk_index();
        return &dpll_data->mpu[sysclk_ind];
}

const struct dpll_params *get_core_dpll_params(struct dplls const *dpll_data)
{
        u32 sysclk_ind = get_sys_clk_index();
        return &dpll_data->core[sysclk_ind];
}

const struct dpll_params *get_per_dpll_params(struct dplls const *dpll_data)
{
        u32 sysclk_ind = get_sys_clk_index();
        return &dpll_data->per[sysclk_ind];
}

const struct dpll_params *get_iva_dpll_params(struct dplls const *dpll_data)
{
        u32 sysclk_ind = get_sys_clk_index();
        return &dpll_data->iva[sysclk_ind];
}

const struct dpll_params *get_usb_dpll_params(struct dplls const *dpll_data)
{
        u32 sysclk_ind = get_sys_clk_index();
        return &dpll_data->usb[sysclk_ind];
}

const struct dpll_params *get_abe_dpll_params(struct dplls const *dpll_data)
{
#ifdef CONFIG_SYS_OMAP_ABE_SYSCK
        u32 sysclk_ind = get_sys_clk_index();
        return &dpll_data->abe[sysclk_ind];
#else
        return dpll_data->abe;
#endif
}

static const struct dpll_params *get_ddr_dpll_params
                        (struct dplls const *dpll_data)
{
        u32 sysclk_ind = get_sys_clk_index();

        if (!dpll_data->ddr)
                return NULL;
        return &dpll_data->ddr[sysclk_ind];
}

#ifdef CONFIG_DRIVER_TI_CPSW
static const struct dpll_params *get_gmac_dpll_params
                        (struct dplls const *dpll_data)
{
        u32 sysclk_ind = get_sys_clk_index();

        if (!dpll_data->gmac)
                return NULL;
        return &dpll_data->gmac[sysclk_ind];
}
#endif

static void do_setup_dpll(u32 const base, const struct dpll_params *params,
                                u8 lock, char *dpll)
{
        u32 temp, M, N;
        struct dpll_regs *const dpll_regs = (struct dpll_regs *)base;

        if (!params)
                return;

        temp = readl(&dpll_regs->cm_clksel_dpll);

        if (check_for_lock(base)) {
                /*
                 * The Dpll has already been locked by rom code using CH.
                 * Check if M,N are matching with Ideal nominal opp values.
                 * If matches, skip the rest otherwise relock.
                 */
                M = (temp & CM_CLKSEL_DPLL_M_MASK) >> CM_CLKSEL_DPLL_M_SHIFT;
                N = (temp & CM_CLKSEL_DPLL_N_MASK) >> CM_CLKSEL_DPLL_N_SHIFT;
                if ((M != (params->m)) || (N != (params->n))) {
                        debug("\n %s Dpll locked, but not for ideal M = %d,"
                                "N = %d values, current values are M = %d,"
                                "N= %d" , dpll, params->m, params->n,
                                M, N);
                } else {
                        /* Dpll locked with ideal values for nominal opps. */
                        debug("\n %s Dpll already locked with ideal"
                                                "nominal opp values", dpll);
                        goto setup_post_dividers;
                }
        }

        bypass_dpll(base);

        /* Set M & N */
        temp &= ~CM_CLKSEL_DPLL_M_MASK;
        temp |= (params->m << CM_CLKSEL_DPLL_M_SHIFT) & CM_CLKSEL_DPLL_M_MASK;

        temp &= ~CM_CLKSEL_DPLL_N_MASK;
        temp |= (params->n << CM_CLKSEL_DPLL_N_SHIFT) & CM_CLKSEL_DPLL_N_MASK;

        writel(temp, &dpll_regs->cm_clksel_dpll);

        /* Lock */
        if (lock)
                do_lock_dpll(base);

setup_post_dividers:
        setup_post_dividers(base, params);

        /* Wait till the DPLL locks */
        if (lock)
                wait_for_lock(base);
}

u32 omap_ddr_clk(void)
{
        u32 ddr_clk, sys_clk_khz, omap_rev, divider;
        const struct dpll_params *core_dpll_params;

        omap_rev = omap_revision();
        sys_clk_khz = get_sys_clk_freq() / 1000;

        core_dpll_params = get_core_dpll_params(*dplls_data);

        debug("sys_clk %d\n ", sys_clk_khz * 1000);

        /* Find Core DPLL locked frequency first */
        ddr_clk = sys_clk_khz * 2 * core_dpll_params->m /
                        (core_dpll_params->n + 1);

        if (omap_rev < OMAP5430_ES1_0) {
                /*
                 * DDR frequency is PHY_ROOT_CLK/2
                 * PHY_ROOT_CLK = Fdpll/2/M2
                 */
                divider = 4;
        } else {
                /*
                 * DDR frequency is PHY_ROOT_CLK
                 * PHY_ROOT_CLK = Fdpll/2/M2
                 */
                divider = 2;
        }

        ddr_clk = ddr_clk / divider / core_dpll_params->m2;
        ddr_clk *= 1000;        /* convert to Hz */
        debug("ddr_clk %d\n ", ddr_clk);

        return ddr_clk;
}

/*
 * Lock MPU dpll
 *
 * Resulting MPU frequencies:
 * 4430 ES1.0   : 600 MHz
 * 4430 ES2.x   : 792 MHz (OPP Turbo)
 * 4460         : 920 MHz (OPP Turbo) - DCC disabled
 */
void configure_mpu_dpll(void)
{
        const struct dpll_params *params;
        struct dpll_regs *mpu_dpll_regs;
        u32 omap_rev;
        omap_rev = omap_revision();

        /*
         * DCC and clock divider settings for 4460.
         * DCC is required, if more than a certain frequency is required.
         * For, 4460 > 1GHZ.
         *     5430 > 1.4GHZ.
         */
        if ((omap_rev >= OMAP4460_ES1_0) && (omap_rev < OMAP5430_ES1_0)) {
                mpu_dpll_regs =
                        (struct dpll_regs *)((*prcm)->cm_clkmode_dpll_mpu);
                bypass_dpll((*prcm)->cm_clkmode_dpll_mpu);
                clrbits_le32((*prcm)->cm_mpu_mpu_clkctrl,
                        MPU_CLKCTRL_CLKSEL_EMIF_DIV_MODE_MASK);
                setbits_le32((*prcm)->cm_mpu_mpu_clkctrl,
                        MPU_CLKCTRL_CLKSEL_ABE_DIV_MODE_MASK);
                clrbits_le32(&mpu_dpll_regs->cm_clksel_dpll,
                        CM_CLKSEL_DCC_EN_MASK);
        }

        params = get_mpu_dpll_params(*dplls_data);

        do_setup_dpll((*prcm)->cm_clkmode_dpll_mpu, params, DPLL_LOCK, "mpu");
        debug("MPU DPLL locked\n");
}

#if defined(CONFIG_USB_EHCI_OMAP) || defined(CONFIG_USB_XHCI_OMAP)
static void setup_usb_dpll(void)
{
        const struct dpll_params *params;
        u32 sys_clk_khz, sd_div, num, den;

        sys_clk_khz = get_sys_clk_freq() / 1000;
        /*
         * USB:
         * USB dpll is J-type. Need to set DPLL_SD_DIV for jitter correction
         * DPLL_SD_DIV = CEILING ([DPLL_MULT/(DPLL_DIV+1)]* CLKINP / 250)
         *      - where CLKINP is sys_clk in MHz
         * Use CLKINP in KHz and adjust the denominator accordingly so
         * that we have enough accuracy and at the same time no overflow
         */
        params = get_usb_dpll_params(*dplls_data);
        num = params->m * sys_clk_khz;
        den = (params->n + 1) * 250 * 1000;
        num += den - 1;
        sd_div = num / den;
        clrsetbits_le32((*prcm)->cm_clksel_dpll_usb,
                        CM_CLKSEL_DPLL_DPLL_SD_DIV_MASK,
                        sd_div << CM_CLKSEL_DPLL_DPLL_SD_DIV_SHIFT);

        /* Now setup the dpll with the regular function */
        do_setup_dpll((*prcm)->cm_clkmode_dpll_usb, params, DPLL_LOCK, "usb");
}
#endif

static void setup_dplls(void)
{
        u32 temp;
        const struct dpll_params *params;

        debug("setup_dplls\n");

        /* CORE dpll */
        params = get_core_dpll_params(*dplls_data);     /* default - safest */
        /*
         * Do not lock the core DPLL now. Just set it up.
         * Core DPLL will be locked after setting up EMIF
         * using the FREQ_UPDATE method(freq_update_core())
         */
        if (emif_sdram_type() == EMIF_SDRAM_TYPE_LPDDR2)
                do_setup_dpll((*prcm)->cm_clkmode_dpll_core, params,
                                                        DPLL_NO_LOCK, "core");
        else
                do_setup_dpll((*prcm)->cm_clkmode_dpll_core, params,
                                                        DPLL_LOCK, "core");
        /* Set the ratios for CORE_CLK, L3_CLK, L4_CLK */
        temp = (CLKSEL_CORE_X2_DIV_1 << CLKSEL_CORE_SHIFT) |
            (CLKSEL_L3_CORE_DIV_2 << CLKSEL_L3_SHIFT) |
            (CLKSEL_L4_L3_DIV_2 << CLKSEL_L4_SHIFT);
        writel(temp, (*prcm)->cm_clksel_core);
        debug("Core DPLL configured\n");

        /* lock PER dpll */
        params = get_per_dpll_params(*dplls_data);
        do_setup_dpll((*prcm)->cm_clkmode_dpll_per,
                        params, DPLL_LOCK, "per");
        debug("PER DPLL locked\n");

        /* MPU dpll */
        configure_mpu_dpll();

#if defined(CONFIG_USB_EHCI_OMAP) || defined(CONFIG_USB_XHCI_OMAP)
        setup_usb_dpll();
#endif
        params = get_ddr_dpll_params(*dplls_data);
        do_setup_dpll((*prcm)->cm_clkmode_dpll_ddrphy,
                      params, DPLL_LOCK, "ddr");

#ifdef CONFIG_DRIVER_TI_CPSW
        params = get_gmac_dpll_params(*dplls_data);
        do_setup_dpll((*prcm)->cm_clkmode_dpll_gmac, params,
                      DPLL_LOCK, "gmac");
#endif
}

u32 get_offset_code(u32 volt_offset, struct pmic_data *pmic)
{
        u32 offset_code;

        volt_offset -= pmic->base_offset;

        offset_code = (volt_offset + pmic->step - 1) / pmic->step;

        /*
         * Offset codes 1-6 all give the base voltage in Palmas
         * Offset code 0 switches OFF the SMPS
         */
        return offset_code + pmic->start_code;
}

void do_scale_vcore(u32 vcore_reg, u32 volt_mv, struct pmic_data *pmic)
{
        u32 offset_code;
        u32 offset = volt_mv;
        int ret = 0;

        if (!volt_mv)
                return;

        pmic->pmic_bus_init();
        /* See if we can first get the GPIO if needed */
        if (pmic->gpio_en)
                ret = gpio_request(pmic->gpio, "PMIC_GPIO");

        if (ret < 0) {
                printf("%s: gpio %d request failed %d\n", __func__,
                                                        pmic->gpio, ret);
                return;
        }

        /* Pull the GPIO low to select SET0 register, while we program SET1 */
        if (pmic->gpio_en)
                gpio_direction_output(pmic->gpio, 0);

        /* convert to uV for better accuracy in the calculations */
        offset *= 1000;

        offset_code = get_offset_code(offset, pmic);

        debug("do_scale_vcore: volt - %d offset_code - 0x%x\n", volt_mv,
                offset_code);

        if (pmic->pmic_write(pmic->i2c_slave_addr, vcore_reg, offset_code))
                printf("Scaling voltage failed for 0x%x\n", vcore_reg);

        if (pmic->gpio_en)
                gpio_direction_output(pmic->gpio, 1);
}

static u32 optimize_vcore_voltage(struct volts const *v)
{
        u32 val;
        if (!v->value)
                return 0;
        if (!v->efuse.reg)
                return v->value;

        switch (v->efuse.reg_bits) {
        case 16:
                val = readw(v->efuse.reg);
                break;
        case 32:
                val = readl(v->efuse.reg);
                break;
        default:
                printf("Error: efuse 0x%08x bits=%d unknown\n",
                       v->efuse.reg, v->efuse.reg_bits);
                return v->value;
        }

        if (!val) {
                printf("Error: efuse 0x%08x bits=%d val=0, using %d\n",
                       v->efuse.reg, v->efuse.reg_bits, v->value);
                return v->value;
        }

        debug("%s:efuse 0x%08x bits=%d Vnom=%d, using efuse value %d\n",
              __func__, v->efuse.reg, v->efuse.reg_bits, v->value, val);
        return val;
}

/*
 * Setup the voltages for vdd_mpu, vdd_core, and vdd_iva
 * We set the maximum voltages allowed here because Smart-Reflex is not
 * enabled in bootloader. Voltage initialization in the kernel will set
 * these to the nominal values after enabling Smart-Reflex
 */
void scale_vcores(struct vcores_data const *vcores)
{
        u32 val;

        val = optimize_vcore_voltage(&vcores->core);
        do_scale_vcore(vcores->core.addr, val, vcores->core.pmic);

        val = optimize_vcore_voltage(&vcores->mpu);
        do_scale_vcore(vcores->mpu.addr, val, vcores->mpu.pmic);

        /* Configure MPU ABB LDO after scale */
        abb_setup((*ctrl)->control_std_fuse_opp_vdd_mpu_2,
                  (*ctrl)->control_wkup_ldovbb_mpu_voltage_ctrl,
                  (*prcm)->prm_abbldo_mpu_setup,
                  (*prcm)->prm_abbldo_mpu_ctrl,
                  (*prcm)->prm_irqstatus_mpu_2,
                  OMAP_ABB_MPU_TXDONE_MASK,
                  OMAP_ABB_FAST_OPP);

        val = optimize_vcore_voltage(&vcores->mm);
        do_scale_vcore(vcores->mm.addr, val, vcores->mm.pmic);

        val = optimize_vcore_voltage(&vcores->gpu);
        do_scale_vcore(vcores->gpu.addr, val, vcores->gpu.pmic);

        val = optimize_vcore_voltage(&vcores->eve);
        do_scale_vcore(vcores->eve.addr, val, vcores->eve.pmic);

        val = optimize_vcore_voltage(&vcores->iva);
        do_scale_vcore(vcores->iva.addr, val, vcores->iva.pmic);
}

static inline void enable_clock_domain(u32 const clkctrl_reg, u32 enable_mode)
{
        clrsetbits_le32(clkctrl_reg, CD_CLKCTRL_CLKTRCTRL_MASK,
                        enable_mode << CD_CLKCTRL_CLKTRCTRL_SHIFT);
        debug("Enable clock domain - %x\n", clkctrl_reg);
}

static inline void wait_for_clk_enable(u32 clkctrl_addr)
{
        u32 clkctrl, idlest = MODULE_CLKCTRL_IDLEST_DISABLED;
        u32 bound = LDELAY;

        while ((idlest == MODULE_CLKCTRL_IDLEST_DISABLED) ||
                (idlest == MODULE_CLKCTRL_IDLEST_TRANSITIONING)) {

                clkctrl = readl(clkctrl_addr);
                idlest = (clkctrl & MODULE_CLKCTRL_IDLEST_MASK) >>
                         MODULE_CLKCTRL_IDLEST_SHIFT;
                if (--bound == 0) {
                        printf("Clock enable failed for 0x%x idlest 0x%x\n",
                                clkctrl_addr, clkctrl);
                        return;
                }
        }
}

static inline void enable_clock_module(u32 const clkctrl_addr, u32 enable_mode,
                                u32 wait_for_enable)
{
        clrsetbits_le32(clkctrl_addr, MODULE_CLKCTRL_MODULEMODE_MASK,
                        enable_mode << MODULE_CLKCTRL_MODULEMODE_SHIFT);
        debug("Enable clock module - %x\n", clkctrl_addr);
        if (wait_for_enable)
                wait_for_clk_enable(clkctrl_addr);
}

void freq_update_core(void)
{
        u32 freq_config1 = 0;
        const struct dpll_params *core_dpll_params;
        u32 omap_rev = omap_revision();

        core_dpll_params = get_core_dpll_params(*dplls_data);
        /* Put EMIF clock domain in sw wakeup mode */
        enable_clock_domain((*prcm)->cm_memif_clkstctrl,
                                CD_CLKCTRL_CLKTRCTRL_SW_WKUP);
        wait_for_clk_enable((*prcm)->cm_memif_emif_1_clkctrl);
        wait_for_clk_enable((*prcm)->cm_memif_emif_2_clkctrl);

        freq_config1 = SHADOW_FREQ_CONFIG1_FREQ_UPDATE_MASK |
            SHADOW_FREQ_CONFIG1_DLL_RESET_MASK;

        freq_config1 |= (DPLL_EN_LOCK << SHADOW_FREQ_CONFIG1_DPLL_EN_SHIFT) &
                                SHADOW_FREQ_CONFIG1_DPLL_EN_MASK;

        freq_config1 |= (core_dpll_params->m2 <<
                        SHADOW_FREQ_CONFIG1_M2_DIV_SHIFT) &
                        SHADOW_FREQ_CONFIG1_M2_DIV_MASK;

        writel(freq_config1, (*prcm)->cm_shadow_freq_config1);
        if (!wait_on_value(SHADOW_FREQ_CONFIG1_FREQ_UPDATE_MASK, 0,
                        (u32 *) (*prcm)->cm_shadow_freq_config1, LDELAY)) {
                puts("FREQ UPDATE procedure failed!!");
                hang();
        }

        /*
         * Putting EMIF in HW_AUTO is seen to be causing issues with
         * EMIF clocks and the master DLL. Keep EMIF in SW_WKUP
         * in OMAP5430 ES1.0 silicon
         */
        if (omap_rev != OMAP5430_ES1_0) {
                /* Put EMIF clock domain back in hw auto mode */
                enable_clock_domain((*prcm)->cm_memif_clkstctrl,
                                        CD_CLKCTRL_CLKTRCTRL_HW_AUTO);
                wait_for_clk_enable((*prcm)->cm_memif_emif_1_clkctrl);
                wait_for_clk_enable((*prcm)->cm_memif_emif_2_clkctrl);
        }
}

void bypass_dpll(u32 const base)
{
        do_bypass_dpll(base);
        wait_for_bypass(base);
}

void lock_dpll(u32 const base)
{
        do_lock_dpll(base);
        wait_for_lock(base);
}

void setup_clocks_for_console(void)
{
        /* Do not add any spl_debug prints in this function */
        clrsetbits_le32((*prcm)->cm_l4per_clkstctrl, CD_CLKCTRL_CLKTRCTRL_MASK,
                        CD_CLKCTRL_CLKTRCTRL_SW_WKUP <<
                        CD_CLKCTRL_CLKTRCTRL_SHIFT);

        /* Enable all UARTs - console will be on one of them */
        clrsetbits_le32((*prcm)->cm_l4per_uart1_clkctrl,
                        MODULE_CLKCTRL_MODULEMODE_MASK,
                        MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
                        MODULE_CLKCTRL_MODULEMODE_SHIFT);

        clrsetbits_le32((*prcm)->cm_l4per_uart2_clkctrl,
                        MODULE_CLKCTRL_MODULEMODE_MASK,
                        MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
                        MODULE_CLKCTRL_MODULEMODE_SHIFT);

        clrsetbits_le32((*prcm)->cm_l4per_uart3_clkctrl,
                        MODULE_CLKCTRL_MODULEMODE_MASK,
                        MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
                        MODULE_CLKCTRL_MODULEMODE_SHIFT);

        clrsetbits_le32((*prcm)->cm_l4per_uart4_clkctrl,
                        MODULE_CLKCTRL_MODULEMODE_MASK,
                        MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
                        MODULE_CLKCTRL_MODULEMODE_SHIFT);

        clrsetbits_le32((*prcm)->cm_l4per_clkstctrl, CD_CLKCTRL_CLKTRCTRL_MASK,
                        CD_CLKCTRL_CLKTRCTRL_HW_AUTO <<
                        CD_CLKCTRL_CLKTRCTRL_SHIFT);
}

void do_enable_clocks(u32 const *clk_domains,
                            u32 const *clk_modules_hw_auto,
                            u32 const *clk_modules_explicit_en,
                            u8 wait_for_enable)
{
        u32 i, max = 100;

        /* Put the clock domains in SW_WKUP mode */
        for (i = 0; (i < max) && clk_domains[i]; i++) {
                enable_clock_domain(clk_domains[i],
                                    CD_CLKCTRL_CLKTRCTRL_SW_WKUP);
        }

        /* Clock modules that need to be put in HW_AUTO */
        for (i = 0; (i < max) && clk_modules_hw_auto[i]; i++) {
                enable_clock_module(clk_modules_hw_auto[i],
                                    MODULE_CLKCTRL_MODULEMODE_HW_AUTO,
                                    wait_for_enable);
        };

        /* Clock modules that need to be put in SW_EXPLICIT_EN mode */
        for (i = 0; (i < max) && clk_modules_explicit_en[i]; i++) {
                enable_clock_module(clk_modules_explicit_en[i],
                                    MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN,
                                    wait_for_enable);
        };

        /* Put the clock domains in HW_AUTO mode now */
        for (i = 0; (i < max) && clk_domains[i]; i++) {
                enable_clock_domain(clk_domains[i],
                                    CD_CLKCTRL_CLKTRCTRL_HW_AUTO);
        }
}

void prcm_init(void)
{
        switch (omap_hw_init_context()) {
        case OMAP_INIT_CONTEXT_SPL:
        case OMAP_INIT_CONTEXT_UBOOT_FROM_NOR:
        case OMAP_INIT_CONTEXT_UBOOT_AFTER_CH:
                enable_basic_clocks();
                timer_init();
                scale_vcores(*omap_vcores);
                setup_dplls();
                setup_warmreset_time();
                break;
        default:
                break;
        }

        if (OMAP_INIT_CONTEXT_SPL != omap_hw_init_context())
                enable_basic_uboot_clocks();
}

void gpi2c_init(void)
{
        static int gpi2c = 1;

        if (gpi2c) {
                i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED,
                         CONFIG_SYS_OMAP24_I2C_SLAVE);
                gpi2c = 0;
        }
}