clock_init.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
/* Clock setup for SMDK5420 board based on EXYNOS5 */
 
#include <device/mmio.h>
#include <soc/clk.h>
#include <soc/cpu.h>
#include <soc/dp.h>
#include <soc/dmc.h>
#include <soc/setup.h>
 
void system_clock_init(void)
{
        u32 val;
 
        /* Turn on the MCT as early as possible. */
        exynos_mct->g_tcon |= (1 << 8);
 
        /* PLL locktime */
        write32(&exynos_clock->apll_lock, APLL_LOCK_VAL);
        write32(&exynos_clock->mpll_lock, MPLL_LOCK_VAL);
        write32(&exynos_clock->bpll_lock, BPLL_LOCK_VAL);
        write32(&exynos_clock->cpll_lock, CPLL_LOCK_VAL);
        write32(&exynos_clock->dpll_lock, DPLL_LOCK_VAL);
        write32(&exynos_clock->epll_lock, EPLL_LOCK_VAL);
        write32(&exynos_clock->vpll_lock, VPLL_LOCK_VAL);
        write32(&exynos_clock->ipll_lock, IPLL_LOCK_VAL);
        write32(&exynos_clock->spll_lock, SPLL_LOCK_VAL);
        write32(&exynos_clock->kpll_lock, KPLL_LOCK_VAL);
        write32(&exynos_clock->rpll_lock, RPLL_LOCK_VAL);
 
        setbits32(&exynos_clock->clk_src_cpu, MUX_HPM_SEL_MASK);
 
        write32(&exynos_clock->clk_src_top6, 0);
 
        write32(&exynos_clock->clk_src_cdrex, 0);
        write32(&exynos_clock->clk_src_kfc, SRC_KFC_HPM_SEL);
        write32(&exynos_clock->clk_div_cpu1, HPM_RATIO);
        write32(&exynos_clock->clk_div_cpu0, CLK_DIV_CPU0_VAL);
 
        /* switch A15 clock source to OSC clock before changing APLL */
        clrbits32(&exynos_clock->clk_src_cpu, APLL_FOUT);
 
        /* Set APLL */
        write32(&exynos_clock->apll_con1, APLL_CON1_VAL);
        val = set_pll(225, 3, 0);       /* FOUT=1800MHz */
        write32(&exynos_clock->apll_con0, val);
        while ((read32(&exynos_clock->apll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* now it is safe to switch to APLL */
        setbits32(&exynos_clock->clk_src_cpu, APLL_FOUT);
 
        write32(&exynos_clock->clk_src_kfc, SRC_KFC_HPM_SEL);
        write32(&exynos_clock->clk_div_kfc0, CLK_DIV_KFC_VAL);
 
        /* switch A7 clock source to OSC clock before changing KPLL */
        clrbits32(&exynos_clock->clk_src_kfc, KPLL_FOUT);
 
        /* Set KPLL*/
        write32(&exynos_clock->kpll_con1, KPLL_CON1_VAL);
        val = set_pll(0x190, 0x4, 0x2);
        write32(&exynos_clock->kpll_con0, val);
        while ((read32(&exynos_clock->kpll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* now it is safe to switch to KPLL */
        setbits32(&exynos_clock->clk_src_kfc, KPLL_FOUT);
 
        /* Set MPLL */
        write32(&exynos_clock->mpll_con1, MPLL_CON1_VAL);
        val = set_pll(0xc8, 0x3, 0x1);
        write32(&exynos_clock->mpll_con0, val);
        while ((read32(&exynos_clock->mpll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* Set DPLL */
        write32(&exynos_clock->dpll_con1, DPLL_CON1_VAL);
        val = set_pll(0x190, 0x4, 0x2);
        write32(&exynos_clock->dpll_con0, val);
        while ((read32(&exynos_clock->dpll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* Set EPLL */
        write32(&exynos_clock->epll_con2, EPLL_CON2_VAL);
        write32(&exynos_clock->epll_con1, EPLL_CON1_VAL);
        val = set_pll(0x64, 0x2, 0x1);
        write32(&exynos_clock->epll_con0, val);
        while ((read32(&exynos_clock->epll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* Set CPLL */
        write32(&exynos_clock->cpll_con1, CPLL_CON1_VAL);
        val = set_pll(0xde, 0x4, 0x1);
        write32(&exynos_clock->cpll_con0, val);
        while ((read32(&exynos_clock->cpll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* Set IPLL */
        write32(&exynos_clock->ipll_con1, IPLL_CON1_VAL);
        val = set_pll(0xB9, 0x3, 0x2);
        write32(&exynos_clock->ipll_con0, val);
        while ((read32(&exynos_clock->ipll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* Set VPLL */
        write32(&exynos_clock->vpll_con1, VPLL_CON1_VAL);
        val = set_pll(0xd7, 0x3, 0x2);
        write32(&exynos_clock->vpll_con0, val);
        while ((read32(&exynos_clock->vpll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* Set BPLL */
        write32(&exynos_clock->bpll_con1, BPLL_CON1_VAL);
        val = set_pll(0xc8, 0x3, 0x1);
        write32(&exynos_clock->bpll_con0, val);
        while ((read32(&exynos_clock->bpll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* Set SPLL */
        write32(&exynos_clock->spll_con1, SPLL_CON1_VAL);
        val = set_pll(200, 0x3, 0x2);   /* 400MHz */
        write32(&exynos_clock->spll_con0, val);
        while ((read32(&exynos_clock->spll_con0) & PLL_LOCKED) == 0)
                ;
 
        /* We use RPLL as the source for FIMD video stream clock */
        write32(&exynos_clock->rpll_con1, RPLL_CON1_VAL);
        write32(&exynos_clock->rpll_con2, RPLL_CON2_VAL);
        /* computed by gabe from first principles; u-boot is probably
         * wrong again
         */
        val = set_pll(0xa0, 0x3, 0x2);
        write32(&exynos_clock->rpll_con0, val);
        /* note: this is a meaningless exercise. The hardware lock
         * detection does not work. So this just spins for some
         * time and is done. NO indication of success should attach
         * to this or any other spin on a con0 value.
         */
        while ((read32(&exynos_clock->rpll_con0) & PLL_LOCKED) == 0)
                ;
 
        write32(&exynos_clock->clk_div_cdrex0, CLK_DIV_CDREX0_VAL);
        write32(&exynos_clock->clk_div_cdrex1, CLK_DIV_CDREX1_VAL);
 
        write32(&exynos_clock->clk_src_top0, CLK_SRC_TOP0_VAL);
        write32(&exynos_clock->clk_src_top1, CLK_SRC_TOP1_VAL);
        write32(&exynos_clock->clk_src_top2, CLK_SRC_TOP2_VAL);
        write32(&exynos_clock->clk_src_top7, CLK_SRC_TOP7_VAL);
 
        write32(&exynos_clock->clk_div_top0, CLK_DIV_TOP0_VAL);
        write32(&exynos_clock->clk_div_top1, CLK_DIV_TOP1_VAL);
        write32(&exynos_clock->clk_div_top2, CLK_DIV_TOP2_VAL);
 
        write32(&exynos_clock->clk_src_top10, 0);
        write32(&exynos_clock->clk_src_top11, 0);
        write32(&exynos_clock->clk_src_top12, 0);
 
        write32(&exynos_clock->clk_src_top3, CLK_SRC_TOP3_VAL);
        write32(&exynos_clock->clk_src_top4, CLK_SRC_TOP4_VAL);
        write32(&exynos_clock->clk_src_top5, CLK_SRC_TOP5_VAL);
 
        /* DISP1 BLK CLK SELECTION */
        write32(&exynos_clock->clk_src_disp10, CLK_SRC_DISP1_0_VAL);
        write32(&exynos_clock->clk_div_disp10, CLK_DIV_DISP1_0_VAL);
 
        /* AUDIO BLK */
        write32(&exynos_clock->clk_src_mau, AUDIO0_SEL_EPLL);
        write32(&exynos_clock->clk_div_mau, DIV_MAU_VAL);
 
        /* FSYS */
        write32(&exynos_clock->clk_src_fsys, CLK_SRC_FSYS0_VAL);
        write32(&exynos_clock->clk_div_fsys0, CLK_DIV_FSYS0_VAL);
        write32(&exynos_clock->clk_div_fsys1, CLK_DIV_FSYS1_VAL);
        write32(&exynos_clock->clk_div_fsys2, CLK_DIV_FSYS2_VAL);
 
        write32(&exynos_clock->clk_src_isp, CLK_SRC_ISP_VAL);
        write32(&exynos_clock->clk_div_isp0, CLK_DIV_ISP0_VAL);
        write32(&exynos_clock->clk_div_isp1, CLK_DIV_ISP1_VAL);
 
        write32(&exynos_clock->clk_src_peric0, CLK_SRC_PERIC0_VAL);
        write32(&exynos_clock->clk_src_peric1, CLK_SRC_PERIC1_VAL);
 
        write32(&exynos_clock->clk_div_peric0, CLK_DIV_PERIC0_VAL);
        write32(&exynos_clock->clk_div_peric1, CLK_DIV_PERIC1_VAL);
        write32(&exynos_clock->clk_div_peric2, CLK_DIV_PERIC2_VAL);
        write32(&exynos_clock->clk_div_peric3, CLK_DIV_PERIC3_VAL);
        write32(&exynos_clock->clk_div_peric4, CLK_DIV_PERIC4_VAL);
 
        write32(&exynos_clock->clk_div_cperi1, CLK_DIV_CPERI1_VAL);
 
        write32(&exynos_clock->clkdiv2_ratio, CLK_DIV2_RATIO);
        write32(&exynos_clock->clkdiv4_ratio, CLK_DIV4_RATIO);
        write32(&exynos_clock->clk_div_g2d, CLK_DIV_G2D);
 
        write32(&exynos_clock->clk_src_cpu, CLK_SRC_CPU_VAL);
        write32(&exynos_clock->clk_src_top6, CLK_SRC_TOP6_VAL);
        write32(&exynos_clock->clk_src_cdrex, CLK_SRC_CDREX_VAL);
        write32(&exynos_clock->clk_src_kfc, CLK_SRC_KFC_VAL);
}
 
void clock_gate(void)
{
        /* Not implemented for now. */
}