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