// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* * Copyright (C) 2020-2022 Intel Corporation */ #include #include #include #include #include #include #include #include DECLARE_GLOBAL_DATA_PTR; struct socfpga_clk_plat { void __iomem *regs; }; /* * function to write the bypass register which requires a poll of the * busy bit */ static void clk_write_bypass_mainpll(struct socfpga_clk_plat *plat, u32 val) { CM_REG_WRITEL(plat, val, CLKMGR_MAINPLL_BYPASS); cm_wait_for_fsm(); } static void clk_write_bypass_perpll(struct socfpga_clk_plat *plat, u32 val) { CM_REG_WRITEL(plat, val, CLKMGR_PERPLL_BYPASS); cm_wait_for_fsm(); } /* function to write the ctrl register which requires a poll of the busy bit */ static void clk_write_ctrl(struct socfpga_clk_plat *plat, u32 val) { CM_REG_WRITEL(plat, val, CLKMGR_CTRL); cm_wait_for_fsm(); } /* * Setup clocks while making no assumptions about previous state of the clocks. */ static void clk_basic_init(struct udevice *dev, const struct cm_config * const cfg) { struct socfpga_clk_plat *plat = dev_get_plat(dev); if (!cfg) return; #if IS_ENABLED(CONFIG_SPL_BUILD) /* Always force clock manager into boot mode before any configuration */ clk_write_ctrl(plat, CM_REG_READL(plat, CLKMGR_CTRL) | CLKMGR_CTRL_BOOTMODE); #else /* Skip clock configuration in SSBL if it's not in boot mode */ if (!(CM_REG_READL(plat, CLKMGR_CTRL) & CLKMGR_CTRL_BOOTMODE)) return; #endif /* Put both PLLs in bypass */ clk_write_bypass_mainpll(plat, CLKMGR_BYPASS_MAINPLL_ALL); clk_write_bypass_perpll(plat, CLKMGR_BYPASS_PERPLL_ALL); /* Put both PLLs in Reset */ CM_REG_SETBITS(plat, CLKMGR_MAINPLL_PLLCTRL, CLKMGR_PLLCTRL_BYPASS_MASK); CM_REG_SETBITS(plat, CLKMGR_PERPLL_PLLCTRL, CLKMGR_PLLCTRL_BYPASS_MASK); /* setup main PLL */ CM_REG_WRITEL(plat, cfg->main_pll_pllglob, CLKMGR_MAINPLL_PLLGLOB); CM_REG_WRITEL(plat, cfg->main_pll_plldiv, CLKMGR_MAINPLL_PLLDIV); CM_REG_WRITEL(plat, cfg->main_pll_plloutdiv, CLKMGR_MAINPLL_PLLOUTDIV); CM_REG_WRITEL(plat, cfg->main_pll_mpuclk, CLKMGR_MAINPLL_MPUCLK); CM_REG_WRITEL(plat, cfg->main_pll_nocclk, CLKMGR_MAINPLL_NOCCLK); CM_REG_WRITEL(plat, cfg->main_pll_nocdiv, CLKMGR_MAINPLL_NOCDIV); /* setup peripheral */ CM_REG_WRITEL(plat, cfg->per_pll_pllglob, CLKMGR_PERPLL_PLLGLOB); CM_REG_WRITEL(plat, cfg->per_pll_plldiv, CLKMGR_PERPLL_PLLDIV); CM_REG_WRITEL(plat, cfg->per_pll_plloutdiv, CLKMGR_PERPLL_PLLOUTDIV); CM_REG_WRITEL(plat, cfg->per_pll_emacctl, CLKMGR_PERPLL_EMACCTL); CM_REG_WRITEL(plat, cfg->per_pll_gpiodiv, CLKMGR_PERPLL_GPIODIV); /* Take both PLL out of reset and power up */ CM_REG_CLRBITS(plat, CLKMGR_MAINPLL_PLLCTRL, CLKMGR_PLLCTRL_BYPASS_MASK); CM_REG_CLRBITS(plat, CLKMGR_PERPLL_PLLCTRL, CLKMGR_PLLCTRL_BYPASS_MASK); cm_wait_for_lock(CLKMGR_STAT_ALLPLL_LOCKED_MASK); CM_REG_WRITEL(plat, cfg->alt_emacactr, CLKMGR_ALTR_EMACACTR); CM_REG_WRITEL(plat, cfg->alt_emacbctr, CLKMGR_ALTR_EMACBCTR); CM_REG_WRITEL(plat, cfg->alt_emacptpctr, CLKMGR_ALTR_EMACPTPCTR); CM_REG_WRITEL(plat, cfg->alt_gpiodbctr, CLKMGR_ALTR_GPIODBCTR); CM_REG_WRITEL(plat, cfg->alt_sdmmcctr, CLKMGR_ALTR_SDMMCCTR); CM_REG_WRITEL(plat, cfg->alt_s2fuser0ctr, CLKMGR_ALTR_S2FUSER0CTR); CM_REG_WRITEL(plat, cfg->alt_s2fuser1ctr, CLKMGR_ALTR_S2FUSER1CTR); CM_REG_WRITEL(plat, cfg->alt_psirefctr, CLKMGR_ALTR_PSIREFCTR); /* Configure ping pong counters in altera group */ CM_REG_WRITEL(plat, CLKMGR_LOSTLOCK_SET_MASK, CLKMGR_MAINPLL_LOSTLOCK); CM_REG_WRITEL(plat, CLKMGR_LOSTLOCK_SET_MASK, CLKMGR_PERPLL_LOSTLOCK); CM_REG_WRITEL(plat, CM_REG_READL(plat, CLKMGR_MAINPLL_PLLGLOB) | CLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK, CLKMGR_MAINPLL_PLLGLOB); CM_REG_WRITEL(plat, CM_REG_READL(plat, CLKMGR_PERPLL_PLLGLOB) | CLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK, CLKMGR_PERPLL_PLLGLOB); /* Take all PLLs out of bypass */ clk_write_bypass_mainpll(plat, 0); clk_write_bypass_perpll(plat, 0); /* Clear the loss of lock bits */ CM_REG_CLRBITS(plat, CLKMGR_INTRCLR, CLKMGR_INTER_PERPLLLOST_MASK | CLKMGR_INTER_MAINPLLLOST_MASK); /* Take all ping pong counters out of reset */ CM_REG_CLRBITS(plat, CLKMGR_ALTR_EXTCNTRST, CLKMGR_ALT_EXTCNTRST_ALLCNTRST_MASK); /* Out of boot mode */ clk_write_ctrl(plat, CM_REG_READL(plat, CLKMGR_CTRL) & ~CLKMGR_CTRL_BOOTMODE); } static u32 clk_get_5_1_clk_src(struct socfpga_clk_plat *plat, u32 reg) { u32 clksrc = CM_REG_READL(plat, reg); return (clksrc & CLKMGR_CLKSRC_MASK) >> CLKMGR_CLKSRC_OFFSET; } static u64 clk_get_pll_output_hz(struct socfpga_clk_plat *plat, u32 pllglob_reg, u32 plldiv_reg) { u64 clock = 0; u32 clklsrc, divf, divr, divq, power = 1; /* Get input clock frequency */ clklsrc = (CM_REG_READL(plat, pllglob_reg) & CLKMGR_PLLGLOB_VCO_PSRC_MASK) >> CLKMGR_PLLGLOB_VCO_PSRC_OFFSET; switch (clklsrc) { case CLKMGR_VCO_PSRC_EOSC1: clock = cm_get_osc_clk_hz(); break; case CLKMGR_VCO_PSRC_INTOSC: clock = cm_get_intosc_clk_hz(); break; case CLKMGR_VCO_PSRC_F2S: clock = cm_get_fpga_clk_hz(); break; } /* Calculate pll out clock frequency */ divf = (CM_REG_READL(plat, plldiv_reg) & CLKMGR_PLLDIV_FDIV_MASK) >> CLKMGR_PLLDIV_FDIV_OFFSET; divr = (CM_REG_READL(plat, plldiv_reg) & CLKMGR_PLLDIV_REFCLKDIV_MASK) >> CLKMGR_PLLDIV_REFCLKDIV_OFFSET; divq = (CM_REG_READL(plat, plldiv_reg) & CLKMGR_PLLDIV_OUTDIV_QDIV_MASK) >> CLKMGR_PLLDIV_OUTDIV_QDIV_OFFSET; while (divq) { power *= 2; divq--; } return (clock * 2 * (divf + 1)) / ((divr + 1) * power); } static u64 clk_get_clksrc_hz(struct socfpga_clk_plat *plat, u32 clksrc_reg, u32 main_div, u32 per_div) { u64 clock = 0; u32 clklsrc = clk_get_5_1_clk_src(plat, clksrc_reg); switch (clklsrc) { case CLKMGR_CLKSRC_MAIN: clock = clk_get_pll_output_hz(plat, CLKMGR_MAINPLL_PLLGLOB, CLKMGR_MAINPLL_PLLDIV); clock /= 1 + main_div; break; case CLKMGR_CLKSRC_PER: clock = clk_get_pll_output_hz(plat, CLKMGR_PERPLL_PLLGLOB, CLKMGR_PERPLL_PLLDIV); clock /= 1 + per_div; break; case CLKMGR_CLKSRC_OSC1: clock = cm_get_osc_clk_hz(); break; case CLKMGR_CLKSRC_INTOSC: clock = cm_get_intosc_clk_hz(); break; case CLKMGR_CLKSRC_FPGA: clock = cm_get_fpga_clk_hz(); break; default: return 0; } return clock; } static u64 clk_get_mpu_clk_hz(struct socfpga_clk_plat *plat) { u32 mainpll_c0cnt = (CM_REG_READL(plat, CLKMGR_MAINPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C0CNT_MASK) >> CLKMGR_PLLOUTDIV_C0CNT_OFFSET; u32 perpll_c0cnt = (CM_REG_READL(plat, CLKMGR_PERPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C0CNT_MASK) >> CLKMGR_PLLOUTDIV_C0CNT_OFFSET; u64 clock = clk_get_clksrc_hz(plat, CLKMGR_MAINPLL_MPUCLK, mainpll_c0cnt, perpll_c0cnt); clock /= 1 + (CM_REG_READL(plat, CLKMGR_MAINPLL_MPUCLK) & CLKMGR_CLKCNT_MSK); return clock; } static u32 clk_get_l3_main_clk_hz(struct socfpga_clk_plat *plat) { u32 mainpll_c1cnt = (CM_REG_READL(plat, CLKMGR_MAINPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C1CNT_MASK) >> CLKMGR_PLLOUTDIV_C1CNT_OFFSET; u32 perpll_c1cnt = (CM_REG_READL(plat, CLKMGR_PERPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C1CNT_MASK) >> CLKMGR_PLLOUTDIV_C1CNT_OFFSET; return clk_get_clksrc_hz(plat, CLKMGR_MAINPLL_NOCCLK, mainpll_c1cnt, perpll_c1cnt); } static u32 clk_get_l4_main_clk_hz(struct socfpga_clk_plat *plat) { u64 clock = clk_get_l3_main_clk_hz(plat); clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >> CLKMGR_NOCDIV_L4MAIN_OFFSET) & CLKMGR_NOCDIV_DIVIDER_MASK); return clock; } static u32 clk_get_sdmmc_clk_hz(struct socfpga_clk_plat *plat) { u32 mainpll_c3cnt = (CM_REG_READL(plat, CLKMGR_MAINPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C3CNT_MASK) >> CLKMGR_PLLOUTDIV_C3CNT_OFFSET; u32 perpll_c3cnt = (CM_REG_READL(plat, CLKMGR_PERPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C3CNT_MASK) >> CLKMGR_PLLOUTDIV_C3CNT_OFFSET; u64 clock = clk_get_clksrc_hz(plat, CLKMGR_ALTR_SDMMCCTR, mainpll_c3cnt, perpll_c3cnt); clock /= 1 + (CM_REG_READL(plat, CLKMGR_ALTR_SDMMCCTR) & CLKMGR_CLKCNT_MSK); return clock / 4; } static u32 clk_get_l4_sp_clk_hz(struct socfpga_clk_plat *plat) { u64 clock = clk_get_l3_main_clk_hz(plat); clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >> CLKMGR_NOCDIV_L4SPCLK_OFFSET) & CLKMGR_NOCDIV_DIVIDER_MASK); return clock; } static u32 clk_get_l4_mp_clk_hz(struct socfpga_clk_plat *plat) { u64 clock = clk_get_l3_main_clk_hz(plat); clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >> CLKMGR_NOCDIV_L4MPCLK_OFFSET) & CLKMGR_NOCDIV_DIVIDER_MASK); return clock; } static u32 clk_get_l4_sys_free_clk_hz(struct socfpga_clk_plat *plat) { if (CM_REG_READL(plat, CLKMGR_STAT) & CLKMGR_STAT_BOOTMODE) return clk_get_l3_main_clk_hz(plat) / 2; return clk_get_l3_main_clk_hz(plat) / 4; } static u32 clk_get_emac_clk_hz(struct socfpga_clk_plat *plat, u32 emac_id) { bool emacsel_a; u32 ctl; u32 ctr_reg; u32 clock; u32 div; u32 reg; /* Get EMAC clock source */ ctl = CM_REG_READL(plat, CLKMGR_PERPLL_EMACCTL); if (emac_id == N5X_EMAC0_CLK) ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC0SELB_OFFSET) & CLKMGR_PERPLLGRP_EMACCTL_EMAC0SELB_MASK; else if (emac_id == N5X_EMAC1_CLK) ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC1SELB_OFFSET) & CLKMGR_PERPLLGRP_EMACCTL_EMAC1SELB_MASK; else if (emac_id == N5X_EMAC2_CLK) ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC2SELB_OFFSET) & CLKMGR_PERPLLGRP_EMACCTL_EMAC2SELB_MASK; else return 0; if (ctl) { /* EMAC B source */ emacsel_a = false; ctr_reg = CLKMGR_ALTR_EMACBCTR; } else { /* EMAC A source */ emacsel_a = true; ctr_reg = CLKMGR_ALTR_EMACACTR; } reg = CM_REG_READL(plat, ctr_reg); clock = (reg & CLKMGR_ALT_EMACCTR_SRC_MASK) >> CLKMGR_ALT_EMACCTR_SRC_OFFSET; div = (reg & CLKMGR_ALT_EMACCTR_CNT_MASK) >> CLKMGR_ALT_EMACCTR_CNT_OFFSET; switch (clock) { case CLKMGR_CLKSRC_MAIN: clock = clk_get_pll_output_hz(plat, CLKMGR_MAINPLL_PLLGLOB, CLKMGR_MAINPLL_PLLDIV); if (emacsel_a) { clock /= 1 + ((CM_REG_READL(plat, CLKMGR_MAINPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C2CNT_MASK) >> CLKMGR_PLLOUTDIV_C2CNT_OFFSET); } else { clock /= 1 + ((CM_REG_READL(plat, CLKMGR_MAINPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C3CNT_MASK) >> CLKMGR_PLLOUTDIV_C3CNT_OFFSET); } break; case CLKMGR_CLKSRC_PER: clock = clk_get_pll_output_hz(plat, CLKMGR_PERPLL_PLLGLOB, CLKMGR_PERPLL_PLLDIV); if (emacsel_a) { clock /= 1 + ((CM_REG_READL(plat, CLKMGR_PERPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C2CNT_MASK) >> CLKMGR_PLLOUTDIV_C2CNT_OFFSET); } else { clock /= 1 + ((CM_REG_READL(plat, CLKMGR_PERPLL_PLLOUTDIV) & CLKMGR_PLLOUTDIV_C3CNT_MASK >> CLKMGR_PLLOUTDIV_C3CNT_OFFSET)); } break; case CLKMGR_CLKSRC_OSC1: clock = cm_get_osc_clk_hz(); break; case CLKMGR_CLKSRC_INTOSC: clock = cm_get_intosc_clk_hz(); break; case CLKMGR_CLKSRC_FPGA: clock = cm_get_fpga_clk_hz(); break; } clock /= 1 + div; return clock; } static ulong socfpga_clk_get_rate(struct clk *clk) { struct socfpga_clk_plat *plat = dev_get_plat(clk->dev); switch (clk->id) { case N5X_MPU_CLK: return clk_get_mpu_clk_hz(plat); case N5X_L4_MAIN_CLK: return clk_get_l4_main_clk_hz(plat); case N5X_L4_SYS_FREE_CLK: return clk_get_l4_sys_free_clk_hz(plat); case N5X_L4_MP_CLK: return clk_get_l4_mp_clk_hz(plat); case N5X_L4_SP_CLK: return clk_get_l4_sp_clk_hz(plat); case N5X_SDMMC_CLK: return clk_get_sdmmc_clk_hz(plat); case N5X_EMAC0_CLK: case N5X_EMAC1_CLK: case N5X_EMAC2_CLK: return clk_get_emac_clk_hz(plat, clk->id); case N5X_USB_CLK: case N5X_NAND_X_CLK: return clk_get_l4_mp_clk_hz(plat); case N5X_NAND_CLK: return clk_get_l4_mp_clk_hz(plat) / 4; default: return -ENXIO; } } static int socfpga_clk_enable(struct clk *clk) { return 0; } static int socfpga_clk_probe(struct udevice *dev) { const struct cm_config *cm_default_cfg = cm_get_default_config(); clk_basic_init(dev, cm_default_cfg); return 0; } static int socfpga_clk_of_to_plat(struct udevice *dev) { struct socfpga_clk_plat *plat = dev_get_plat(dev); fdt_addr_t addr; addr = devfdt_get_addr(dev); if (addr == FDT_ADDR_T_NONE) return -EINVAL; plat->regs = (void __iomem *)addr; return 0; } static struct clk_ops socfpga_clk_ops = { .enable = socfpga_clk_enable, .get_rate = socfpga_clk_get_rate, }; static const struct udevice_id socfpga_clk_match[] = { { .compatible = "intel,n5x-clkmgr" }, {} }; U_BOOT_DRIVER(socfpga_n5x_clk) = { .name = "clk-n5x", .id = UCLASS_CLK, .of_match = socfpga_clk_match, .ops = &socfpga_clk_ops, .probe = socfpga_clk_probe, .of_to_plat = socfpga_clk_of_to_plat, .plat_auto = sizeof(struct socfpga_clk_plat), };