/* * (C) Copyright 2010-2014 * NVIDIA Corporation * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #include #include #include "../cpu.h" /* Tegra114-specific CPU init code */ static void enable_cpu_power_rail(void) { struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE; struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; u32 reg; debug("%s entry\n", __func__); /* un-tristate PWR_I2C SCL/SDA, rest of the defaults are correct */ pinmux_tristate_disable(PMUX_PINGRP_PWR_I2C_SCL_PZ6); pinmux_tristate_disable(PMUX_PINGRP_PWR_I2C_SDA_PZ7); /* * Set CPUPWRGOOD_TIMER - APB clock is 1/2 of SCLK (102MHz), * set it for 25ms (102MHz * .025) */ reg = 0x26E8F0; writel(reg, &pmc->pmc_cpupwrgood_timer); /* Set polarity to 0 (normal) and enable CPUPWRREQ_OE */ clrbits_le32(&pmc->pmc_cntrl, CPUPWRREQ_POL); setbits_le32(&pmc->pmc_cntrl, CPUPWRREQ_OE); /* * Set CLK_RST_CONTROLLER_CPU_SOFTRST_CTRL2_0_CAR2PMC_CPU_ACK_WIDTH * to 408 to satisfy the requirement of having at least 16 CPU clock * cycles before clamp removal. */ clrbits_le32(&clkrst->crc_cpu_softrst_ctrl2, 0xFFF); setbits_le32(&clkrst->crc_cpu_softrst_ctrl2, 408); } static void enable_cpu_clocks(void) { struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; struct clk_pll_info *pllinfo = &tegra_pll_info_table[CLOCK_ID_XCPU]; u32 reg; debug("%s entry\n", __func__); /* Wait for PLL-X to lock */ do { reg = readl(&clkrst->crc_pll_simple[SIMPLE_PLLX].pll_base); } while ((reg & (1 << pllinfo->lock_det)) == 0); /* Wait until all clocks are stable */ udelay(PLL_STABILIZATION_DELAY); writel(CCLK_BURST_POLICY, &clkrst->crc_cclk_brst_pol); writel(SUPER_CCLK_DIVIDER, &clkrst->crc_super_cclk_div); /* Always enable the main CPU complex clocks */ clock_enable(PERIPH_ID_CPU); clock_enable(PERIPH_ID_CPULP); clock_enable(PERIPH_ID_CPUG); } static void remove_cpu_resets(void) { struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; u32 reg; debug("%s entry\n", __func__); /* Take the slow non-CPU partition out of reset */ reg = readl(&clkrst->crc_rst_cpulp_cmplx_clr); writel((reg | CLR_NONCPURESET), &clkrst->crc_rst_cpulp_cmplx_clr); /* Take the fast non-CPU partition out of reset */ reg = readl(&clkrst->crc_rst_cpug_cmplx_clr); writel((reg | CLR_NONCPURESET), &clkrst->crc_rst_cpug_cmplx_clr); /* Clear the SW-controlled reset of the slow cluster */ reg = readl(&clkrst->crc_rst_cpulp_cmplx_clr); reg |= (CLR_CPURESET0+CLR_DBGRESET0+CLR_CORERESET0+CLR_CXRESET0); writel(reg, &clkrst->crc_rst_cpulp_cmplx_clr); /* Clear the SW-controlled reset of the fast cluster */ reg = readl(&clkrst->crc_rst_cpug_cmplx_clr); reg |= (CLR_CPURESET0+CLR_DBGRESET0+CLR_CORERESET0+CLR_CXRESET0); reg |= (CLR_CPURESET1+CLR_DBGRESET1+CLR_CORERESET1+CLR_CXRESET1); reg |= (CLR_CPURESET2+CLR_DBGRESET2+CLR_CORERESET2+CLR_CXRESET2); reg |= (CLR_CPURESET3+CLR_DBGRESET3+CLR_CORERESET3+CLR_CXRESET3); writel(reg, &clkrst->crc_rst_cpug_cmplx_clr); } /** * Tegra114 requires some special clock initialization, including setting up * the DVC I2C, turning on MSELECT and selecting the G CPU cluster */ void t114_init_clocks(void) { struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE; struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE; u32 val; debug("%s entry\n", __func__); /* Set active CPU cluster to G */ clrbits_le32(&flow->cluster_control, 1); writel(SUPER_SCLK_ENB_MASK, &clkrst->crc_super_sclk_div); debug("Setting up PLLX\n"); init_pllx(); val = (1 << CLK_SYS_RATE_AHB_RATE_SHIFT); writel(val, &clkrst->crc_clk_sys_rate); /* Enable clocks to required peripherals. TBD - minimize this list */ debug("Enabling clocks\n"); clock_set_enable(PERIPH_ID_CACHE2, 1); clock_set_enable(PERIPH_ID_GPIO, 1); clock_set_enable(PERIPH_ID_TMR, 1); clock_set_enable(PERIPH_ID_RTC, 1); clock_set_enable(PERIPH_ID_CPU, 1); clock_set_enable(PERIPH_ID_EMC, 1); clock_set_enable(PERIPH_ID_I2C5, 1); clock_set_enable(PERIPH_ID_FUSE, 1); clock_set_enable(PERIPH_ID_PMC, 1); clock_set_enable(PERIPH_ID_APBDMA, 1); clock_set_enable(PERIPH_ID_MEM, 1); clock_set_enable(PERIPH_ID_IRAMA, 1); clock_set_enable(PERIPH_ID_IRAMB, 1); clock_set_enable(PERIPH_ID_IRAMC, 1); clock_set_enable(PERIPH_ID_IRAMD, 1); clock_set_enable(PERIPH_ID_CORESIGHT, 1); clock_set_enable(PERIPH_ID_MSELECT, 1); clock_set_enable(PERIPH_ID_EMC1, 1); clock_set_enable(PERIPH_ID_MC1, 1); clock_set_enable(PERIPH_ID_DVFS, 1); /* * Set MSELECT clock source as PLLP (00), and ask for a clock * divider that would set the MSELECT clock at 102MHz for a * PLLP base of 408MHz. */ clock_ll_set_source_divisor(PERIPH_ID_MSELECT, 0, CLK_DIVIDER(NVBL_PLLP_KHZ, 102000)); /* I2C5 (DVC) gets CLK_M and a divisor of 17 */ clock_ll_set_source_divisor(PERIPH_ID_I2C5, 3, 16); /* Give clocks time to stabilize */ udelay(1000); /* Take required peripherals out of reset */ debug("Taking periphs out of reset\n"); reset_set_enable(PERIPH_ID_CACHE2, 0); reset_set_enable(PERIPH_ID_GPIO, 0); reset_set_enable(PERIPH_ID_TMR, 0); reset_set_enable(PERIPH_ID_COP, 0); reset_set_enable(PERIPH_ID_EMC, 0); reset_set_enable(PERIPH_ID_I2C5, 0); reset_set_enable(PERIPH_ID_FUSE, 0); reset_set_enable(PERIPH_ID_APBDMA, 0); reset_set_enable(PERIPH_ID_MEM, 0); reset_set_enable(PERIPH_ID_CORESIGHT, 0); reset_set_enable(PERIPH_ID_MSELECT, 0); reset_set_enable(PERIPH_ID_EMC1, 0); reset_set_enable(PERIPH_ID_MC1, 0); reset_set_enable(PERIPH_ID_DVFS, 0); debug("%s exit\n", __func__); } static bool is_partition_powered(u32 partid) { struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE; u32 reg; /* Get power gate status */ reg = readl(&pmc->pmc_pwrgate_status); return !!(reg & (1 << partid)); } static bool is_clamp_enabled(u32 partid) { struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE; u32 reg; /* Get clamp status. */ reg = readl(&pmc->pmc_clamp_status); return !!(reg & (1 << partid)); } static void power_partition(u32 partid) { struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE; debug("%s: part ID = %08X\n", __func__, partid); /* Is the partition already on? */ if (!is_partition_powered(partid)) { /* No, toggle the partition power state (OFF -> ON) */ debug("power_partition, toggling state\n"); writel(START_CP | partid, &pmc->pmc_pwrgate_toggle); /* Wait for the power to come up */ while (!is_partition_powered(partid)) ; /* Wait for the clamp status to be cleared */ while (is_clamp_enabled(partid)) ; /* Give I/O signals time to stabilize */ udelay(IO_STABILIZATION_DELAY); } } void powerup_cpus(void) { /* We boot to the fast cluster */ debug("%s entry: G cluster\n", __func__); /* Power up the fast cluster rail partition */ power_partition(CRAIL); /* Power up the fast cluster non-CPU partition */ power_partition(C0NC); /* Power up the fast cluster CPU0 partition */ power_partition(CE0); } void start_cpu(u32 reset_vector) { u32 imme, inst; debug("%s entry, reset_vector = %x\n", __func__, reset_vector); t114_init_clocks(); /* Enable VDD_CPU */ enable_cpu_power_rail(); /* Get the CPU(s) running */ enable_cpu_clocks(); /* Enable CoreSight */ clock_enable_coresight(1); /* Take CPU(s) out of reset */ remove_cpu_resets(); /* Set the entry point for CPU execution from reset */ /* * A01P with patched boot ROM; vector hard-coded to 0x4003fffc. * See nvbug 1193357 for details. */ /* mov r0, #lsb(reset_vector) */ imme = reset_vector & 0xffff; inst = imme & 0xfff; inst |= ((imme >> 12) << 16); inst |= 0xe3000000; writel(inst, 0x4003fff0); /* movt r0, #msb(reset_vector) */ imme = (reset_vector >> 16) & 0xffff; inst = imme & 0xfff; inst |= ((imme >> 12) << 16); inst |= 0xe3400000; writel(inst, 0x4003fff4); /* bx r0 */ writel(0xe12fff10, 0x4003fff8); /* b -12 */ imme = (u32)-20; inst = (imme >> 2) & 0xffffff; inst |= 0xea000000; writel(inst, 0x4003fffc); /* Write to original location for compatibility */ writel(reset_vector, EXCEP_VECTOR_CPU_RESET_VECTOR); /* If the CPU(s) don't already have power, power 'em up */ powerup_cpus(); }